CA1095734A - Combined oscillating and unidirectional agitator for automatic washer - Google Patents
Combined oscillating and unidirectional agitator for automatic washerInfo
- Publication number
- CA1095734A CA1095734A CA279,334A CA279334A CA1095734A CA 1095734 A CA1095734 A CA 1095734A CA 279334 A CA279334 A CA 279334A CA 1095734 A CA1095734 A CA 1095734A
- Authority
- CA
- Canada
- Prior art keywords
- agitator
- agitator element
- washing
- fabrics
- vanes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F13/00—Washing machines having receptacles, stationary for washing purposes, with agitators therein contacting the articles being washed
Abstract
COMBINED OSCILLATING AND UNIDIRECTIONAL
AGITATOR FOR AUTOMATIC WASHER
ABSTRACT OF THE DISCLOSURE
Improved agitation means for use in a clothes washing machine of the type in which an agitator is oscillated by means of a drive mechanism to secure agitation of the clothes placed within the washing machine. The present invention provides a first agitator element and a second agitator element driven from a common driving source, the second agitator element being provided with means to urge clothes into a rollover pattern established by the coaction of the agitator elements and thereby impart a highly efficient rollover motion to the clothes. The first agitator element employs flexible vanes and is preferably located below and coaxial to the second agitator element which may be driven either intermittently, or continuously, in a unidirectional rotary motion. Use of the flexible vanes tends to avoid tangling of fabrics on the agitator, which might otherwise lead to increased shaft torque, reduced rollover or an unbalanced load of clothes.
AGITATOR FOR AUTOMATIC WASHER
ABSTRACT OF THE DISCLOSURE
Improved agitation means for use in a clothes washing machine of the type in which an agitator is oscillated by means of a drive mechanism to secure agitation of the clothes placed within the washing machine. The present invention provides a first agitator element and a second agitator element driven from a common driving source, the second agitator element being provided with means to urge clothes into a rollover pattern established by the coaction of the agitator elements and thereby impart a highly efficient rollover motion to the clothes. The first agitator element employs flexible vanes and is preferably located below and coaxial to the second agitator element which may be driven either intermittently, or continuously, in a unidirectional rotary motion. Use of the flexible vanes tends to avoid tangling of fabrics on the agitator, which might otherwise lead to increased shaft torque, reduced rollover or an unbalanced load of clothes.
Description
5~5~734 BACKGROUND OF THE INVENTION
Field of the Invention This invention is in the field of automatic washing ; machines employing vertical axis agitators which oscillate to provide a tumbling or generally toroidal motion to the clothes in washing the clothes contained within the machine and pro-vides an agitator construction which is particularly useful with large or heavy clothes loads to improve the movement 1~9~73a, of the clothes within the machine and thereby the washing action.
DESCRIPTION OF THE PRIOR ART
It has long been appreciated that the most effi-cient clothes movement pattern for washing clothes within an automatic washing machine having a vertical axis agitator is a pattern which provides a rollover of the clothes which involves moving the clothes down the agitator barrel, then radially outward from the oscillating agitator vanes, upward along the wall of the tub, and inward to the barrel. Conven-tional washing machines are reasonably proficient in achiev-ing this type of rollover pattern when light loads are being washed, but not with heavy loads. When the washing basket is tightly packed with clothes, the load crowds the agitator and the basket area. A conventional oscillating agitator has difficulty in attaining any kind of a rollover to the clothes ~-; load under these conditions. The conventional-type agitator then scrubs merely the bottom portion of a tightly-packed heavy load, resulting in a very poor uneven cleaning action.
There are a few examples in prior patents of agita-tors which move in separate paths during a washing operation.
For example, the Bryant U.S. Patent No. 1,834,936 suggests dual agitator members which are reciprocated in opposite di~
rections wi-thin the tub, the ob~ect being to create a violent water action.
The Krolzick U.S. Patent No. 3,678,714 assigned to the same assignee as the present invention describes a wash-ing machine assembly including a pair of agitators, the two agitators being coupled together for mutual oscillation, but having cam means or the like provided between the two agitators to effect a vertical reciprocation of one with respect to the other during such oscillation.
Prior art patents disclose agitators with spiral vane elements. For example, Dyer U.S. Patent No. 2,331,897 discloses a washing machine having an agitator provided with a spiral vane on an upper portion, the agitator rotating at motor speed during washing.
Krolzick U.S. Patent Des. 196,194 assigned to the same assignee as the present invention shows an agitator for a laundry machine wherein the ornamental design for the ayi-tator includes a spiral vane arrangement.
Geldhof U.S. Patent No. 2,734,367, assigned to a predecessor of the assignee of the present invention, shows an agitator for a laundry machine wherein the agitator in-cludes spiral vanes which extend in the form of radial vanes on their lower edges with radial projections or vanes extend-ing intermediate the spiral vanes.
Fle:~ible agitator vanes have been used in combina-tion with an agitator skirt portion as in U.S. Patent No.
20 3,307,383 to Cobb et al assigned to the assignee of the present invention. That patent shows flexible vanes at-tached to the center agitator post and spaced above a skirt to reduce tangling of fabrics on the agitator vanes.
Walton U.S. Patent No. 3,112,532 discloses an agi-tator having a ribbed and grooved agitator barrel and flexible vanes for reducing tangling of clothing on such vanes during oscillation of the agitator.
U.S. Patent No. 3,381,504 to Smith shows flexible vanes attached to the cen-ter agitator post and spaced above a skirt with the spacing increasing toward the outer peri-phery of the skirt.
U.S. Patent No. 3,608,110 to llubbard et al shows an agitator assembly having small upper vanes connected to lower vanes by helical vane ~ections, the lower vanes bein~
substantially flexible. The entire agitator having the three classes of vanes oscillates back and forth together with the skirt lying beneath but unattached to the lower vanes, in an attempt to achieve a toroidal movement of clothing and washing fluid in the washing tub.
The following additional references are part of the prior art for consideration in connection with the present invention.
Altorfer 1,704,9323/1929 ~laus 2,021,09711/1935 Skinner 2,253,9898/1941 Castner 2,502,70~4/1950 Byrd et al. 3,117,4341/1964 Bochan 3,285,04011/1966 In general, the prior art has provided agitators having only oscillatory motions, attempting to achieve good rollover of clothing in the washing tub by increasing the vigor of the agitation.
In contrast, Canadian Patent 1,045~401 issued January 2, 1979 to Platt, the present applicant and assigned to the assignee of the present application, discloses a dual action auger agitator c~mprising a combination oscillating and unidrectional agitator for an automatic washer, having a unidirectional auger provided with a helical vane and one set of oscillating lower or scrubbing vanes.
Dual action auger agitators of the type generally disclosed in the above-mentioned Platt Canadian patent include a vaned lower agitator element mounted for oscillating motion about an axis o~ a washer ~q~g573~
and an upper agitator element mounted for unidrectional rotation about the same axis, the upper auger agitator element having helical vane means associated therewith for forcing or deflecting clothes in the washer adjacent the upper agitator element downward toward the oscillating vanes on the lower portion of the agitator. The described operation of the dual action auger agitator is effective to promote the desired con-tinuous rollover movement of the clothes and fabrics undergoing washing, resulting in improved and more uniform wa.shabili~y of the clothes load.
Additionally, U.S. Patent 3,987~652 issued October 26, 1976 to Ruble and assigned to the assignee of the present invention, discloses a dual action auger agitator comprising an oscillating vertical-axis agitator in combination with an agitator accessory having a sleeve for mounting on the agitator and a helical vane projecting from the sleeve in the form of an auger. The auger agitator accessory is rotated in one direction via a one-way clutch during one-half cycles of the oscillating agitator.
SUMMARY OF THE INVE~ITION
; The present invention provides in an agitator assembly for a clothes washing machine of the type co~lprising first and second agitator elements respectively driven in oscillatory and unidirectional rotary motions to circulate the contents of the machine in a toroidal rollover pattern within the washing machine and wherein the second agitator element has means for forcing articles adjacent thereto into the oscillatory path of the first agitator element and into the rollover pattern, the improvement wherein said first agitator element has formed thereon flexible vanes which are free to flex in response to oscillatory motions of the first agitator element, thereby to yieldingly engage fabrics de-flected downwardly and lessen high impact loading of the first agitator element.
In the preferred embodiment the second agitator element is coupled to the drive shaft by means of a one-way clutch for unidirectional '~ -~95~34 rotation about the axîs of the agitator. This second, upper agitator element is provided wi~h auger-like vane means for urging clothes within the receptacle downwardly toward the first lower agitator element where they are contacted by the flexible vanes which form a set of generally vertically-extending vanes disposed about a skirt portion of the lower agitator element. In effect, therefore, the upper agitator element acts to continuously feed clothes downwardly along the barrel of the agita~or where they come under the influence of the oscillating vertically positioned vanes of.the lower agitator element which direct the clothes radially outwardly toward the periphery of the basket, and eventually upwardly and back to the barrel of the upper agitator element, completing a repeating rollover cycle which is extremely efficient for securing a uniform scrubbing contact of the clothes with the wash liquid.
~ dditionally, there is shown a modification of the invention pro-viding a continuous rotary motion for one of the agitator elements and an oscillatory motion for the other of the agitator elements.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of embodiments of the invention will be readily apparent from the following description of certain pre-ferred embodiments thereof, taken in conjunction with the accompanyingdrawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure, and in which:
Figure 1 is a view partly broken away, of a conventional automatic washing machine assembly provided with an improved agitator means according to the present invention;
~ ~, 1~`9573~
Figure 2 is a vertical cross-sectional view of the agitator means of the Canadian patent referred to above during a washing cycle showing the manner in which the clothes are ro].led over to ensure efficient contact with the wash liquid;
Figure 3 is a view in elevation of the upper agitator element shown in the assembly of Figure 2;
Figure 4 is an elevational view of a modified form of upper agitator element;
. Figure S is a view in elevation of a preferred form of agitator assembly of the present invention;
Figure 6 is a top plan view of the agitator assembly of Figure 5 mounted in a perforated basket positioned within an imperforate fluid retaining tub with an arrow adjacent the agitator axis indicating the direction of rotation of the auger agitator, and arrows indicating the movement of clothes about the axis of rotation of the auger agitator of the present invention;
Figure 7 is a cross-sectional view through the vertical axis of the washing machine tub and agitator assembly, on line VII-VII of ~igure 6, and indicating movement of the clothes, fabrics and washing ZO fluid within the tub;
Figure 8 is a perspective view of the structure of Figure 7 with a wall portion of the basket being removed to better illustrate the movement of clothes about the axis of rotation of the auger agitator; and Figure 9 is a fragmentary vertical cross-~ectional view of a modified form of the invention providing a contin- -~
uous rotary motion for the auger element of the agitator and an oscillatory motion for a skirt portion of the agitator having scrubbing vanes attached thereto.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
In Figure 1, reference numeral 10 indicates gen-erally a washing machine of the automatic type including a frame 11 carrying vertical panels 12 forming the sides, front and back of the cabinet for the washing machine 10.
A hinged lid 13 is provided in the usual manner to provide access to the interior of the washing machine. The wash-ing machine 10 has the usual console 14 including a timer dial 15 and a program selector 16.
Internally of the machine 10 there is disclosed an imperforate fluid retaining tub 17 which is supported within the washing machine cabinet by means of a base sup-port plate 18. A plu~ality of suspension rods 19 having resilient spherical end portions 20 and 21 are positioned about the tub 17 in the usual manner to suspend the tub 17 freely within the interior of the cabinet for the washing machine.
A perforate washing receptacle or basket 22 is positioned concentrically within the tub 17. Centrally of ~ the perforate washing basket 22 is an improved agitator means which has been designated generally in the drawings by the reference numeral 23.
~q~9~73~a Liquid is introduced into the washing machine by means of a solenoid controlled inlet valve 24 which direets the liquid through a conduit 25 and through an anti-siphon device 20a into the washing machine~ A filter 27 is positioned along a tub ring 28a disposed between the tub 17 which receives the washing fluid and the basket 22 whieh receives the elothing or other fabrics to be cleaned therein. A
eonduit 28b eonnects the outlet port of a pump 29 to the filter 27, and a second eonduit 28c provides fluid communi cation between the inlet port of pump 29 and the clothes washing zone within basket 22 of the washing machine. During the agitate portion of the wash cycle wash water is circulated - by the pump 29 through eonduit 28b to filter 27, from the filter into the washing zone, and from the washing zone through a seeond eonduit 28e baek to the pump 29. A filtering of the wash water is thus accomplished.
The pump 29 as well as the other movable parts of the assembly are driven by means of a motor 30 whieh oper-ates through a transmission 31. A cluteh and brake assembly generally indieated by the reference numeral 32 is provided for energizing the agitator means 23 during washing, and for disengaging the a~itator and engaging a basket spin tube, subsequently to be deseribed, for spinning the basket 22 during the liquid extraeting portion of the washing phase. All of the drive elements and hydraulic units des-cribed thus far are eonventional in vertieal-axis automatie washing maehines, and the improvements of the present in-vention are eentered in the agitator means 23, which is described specifically below.
As seen in Figure 2, the agitator means 23 has a lower agitator element 33 with a skirt portion 34 which ~?9~'734 carries a plurality of spaced, generally vertical agitator vanes 35. An agitator drive shaft 36 extends through the lower agitator element 33 and an upper agitator element 33a and is threadedly received within an agitator cap 37. The shaft 36 has a splined portion 38 which is rigidly connected to an agitator drive coupler 39 for oscillating the lower agitator element 33 in the usual manner.
A spin tube 40 surrounds the shaft 36 over a por-tion of its length and is received between spaced bearings 41 and 42. A pulley 43 is provided about the spin tube 40 for mechanical connection to a drive motor and transmission in the usual manner. The upper end of the spin tube is received within a basket drive block 44 and its associated nut 45 to drive the basket 22 at high speed during the extraction cycle when wash liquid is removed from the clothes by centrifugal force.
The upper agitator element 33a is composed of a synthetic resin or the like and, as illustrated in Figures
Field of the Invention This invention is in the field of automatic washing ; machines employing vertical axis agitators which oscillate to provide a tumbling or generally toroidal motion to the clothes in washing the clothes contained within the machine and pro-vides an agitator construction which is particularly useful with large or heavy clothes loads to improve the movement 1~9~73a, of the clothes within the machine and thereby the washing action.
DESCRIPTION OF THE PRIOR ART
It has long been appreciated that the most effi-cient clothes movement pattern for washing clothes within an automatic washing machine having a vertical axis agitator is a pattern which provides a rollover of the clothes which involves moving the clothes down the agitator barrel, then radially outward from the oscillating agitator vanes, upward along the wall of the tub, and inward to the barrel. Conven-tional washing machines are reasonably proficient in achiev-ing this type of rollover pattern when light loads are being washed, but not with heavy loads. When the washing basket is tightly packed with clothes, the load crowds the agitator and the basket area. A conventional oscillating agitator has difficulty in attaining any kind of a rollover to the clothes ~-; load under these conditions. The conventional-type agitator then scrubs merely the bottom portion of a tightly-packed heavy load, resulting in a very poor uneven cleaning action.
There are a few examples in prior patents of agita-tors which move in separate paths during a washing operation.
For example, the Bryant U.S. Patent No. 1,834,936 suggests dual agitator members which are reciprocated in opposite di~
rections wi-thin the tub, the ob~ect being to create a violent water action.
The Krolzick U.S. Patent No. 3,678,714 assigned to the same assignee as the present invention describes a wash-ing machine assembly including a pair of agitators, the two agitators being coupled together for mutual oscillation, but having cam means or the like provided between the two agitators to effect a vertical reciprocation of one with respect to the other during such oscillation.
Prior art patents disclose agitators with spiral vane elements. For example, Dyer U.S. Patent No. 2,331,897 discloses a washing machine having an agitator provided with a spiral vane on an upper portion, the agitator rotating at motor speed during washing.
Krolzick U.S. Patent Des. 196,194 assigned to the same assignee as the present invention shows an agitator for a laundry machine wherein the ornamental design for the ayi-tator includes a spiral vane arrangement.
Geldhof U.S. Patent No. 2,734,367, assigned to a predecessor of the assignee of the present invention, shows an agitator for a laundry machine wherein the agitator in-cludes spiral vanes which extend in the form of radial vanes on their lower edges with radial projections or vanes extend-ing intermediate the spiral vanes.
Fle:~ible agitator vanes have been used in combina-tion with an agitator skirt portion as in U.S. Patent No.
20 3,307,383 to Cobb et al assigned to the assignee of the present invention. That patent shows flexible vanes at-tached to the center agitator post and spaced above a skirt to reduce tangling of fabrics on the agitator vanes.
Walton U.S. Patent No. 3,112,532 discloses an agi-tator having a ribbed and grooved agitator barrel and flexible vanes for reducing tangling of clothing on such vanes during oscillation of the agitator.
U.S. Patent No. 3,381,504 to Smith shows flexible vanes attached to the cen-ter agitator post and spaced above a skirt with the spacing increasing toward the outer peri-phery of the skirt.
U.S. Patent No. 3,608,110 to llubbard et al shows an agitator assembly having small upper vanes connected to lower vanes by helical vane ~ections, the lower vanes bein~
substantially flexible. The entire agitator having the three classes of vanes oscillates back and forth together with the skirt lying beneath but unattached to the lower vanes, in an attempt to achieve a toroidal movement of clothing and washing fluid in the washing tub.
The following additional references are part of the prior art for consideration in connection with the present invention.
Altorfer 1,704,9323/1929 ~laus 2,021,09711/1935 Skinner 2,253,9898/1941 Castner 2,502,70~4/1950 Byrd et al. 3,117,4341/1964 Bochan 3,285,04011/1966 In general, the prior art has provided agitators having only oscillatory motions, attempting to achieve good rollover of clothing in the washing tub by increasing the vigor of the agitation.
In contrast, Canadian Patent 1,045~401 issued January 2, 1979 to Platt, the present applicant and assigned to the assignee of the present application, discloses a dual action auger agitator c~mprising a combination oscillating and unidrectional agitator for an automatic washer, having a unidirectional auger provided with a helical vane and one set of oscillating lower or scrubbing vanes.
Dual action auger agitators of the type generally disclosed in the above-mentioned Platt Canadian patent include a vaned lower agitator element mounted for oscillating motion about an axis o~ a washer ~q~g573~
and an upper agitator element mounted for unidrectional rotation about the same axis, the upper auger agitator element having helical vane means associated therewith for forcing or deflecting clothes in the washer adjacent the upper agitator element downward toward the oscillating vanes on the lower portion of the agitator. The described operation of the dual action auger agitator is effective to promote the desired con-tinuous rollover movement of the clothes and fabrics undergoing washing, resulting in improved and more uniform wa.shabili~y of the clothes load.
Additionally, U.S. Patent 3,987~652 issued October 26, 1976 to Ruble and assigned to the assignee of the present invention, discloses a dual action auger agitator comprising an oscillating vertical-axis agitator in combination with an agitator accessory having a sleeve for mounting on the agitator and a helical vane projecting from the sleeve in the form of an auger. The auger agitator accessory is rotated in one direction via a one-way clutch during one-half cycles of the oscillating agitator.
SUMMARY OF THE INVE~ITION
; The present invention provides in an agitator assembly for a clothes washing machine of the type co~lprising first and second agitator elements respectively driven in oscillatory and unidirectional rotary motions to circulate the contents of the machine in a toroidal rollover pattern within the washing machine and wherein the second agitator element has means for forcing articles adjacent thereto into the oscillatory path of the first agitator element and into the rollover pattern, the improvement wherein said first agitator element has formed thereon flexible vanes which are free to flex in response to oscillatory motions of the first agitator element, thereby to yieldingly engage fabrics de-flected downwardly and lessen high impact loading of the first agitator element.
In the preferred embodiment the second agitator element is coupled to the drive shaft by means of a one-way clutch for unidirectional '~ -~95~34 rotation about the axîs of the agitator. This second, upper agitator element is provided wi~h auger-like vane means for urging clothes within the receptacle downwardly toward the first lower agitator element where they are contacted by the flexible vanes which form a set of generally vertically-extending vanes disposed about a skirt portion of the lower agitator element. In effect, therefore, the upper agitator element acts to continuously feed clothes downwardly along the barrel of the agita~or where they come under the influence of the oscillating vertically positioned vanes of.the lower agitator element which direct the clothes radially outwardly toward the periphery of the basket, and eventually upwardly and back to the barrel of the upper agitator element, completing a repeating rollover cycle which is extremely efficient for securing a uniform scrubbing contact of the clothes with the wash liquid.
~ dditionally, there is shown a modification of the invention pro-viding a continuous rotary motion for one of the agitator elements and an oscillatory motion for the other of the agitator elements.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of embodiments of the invention will be readily apparent from the following description of certain pre-ferred embodiments thereof, taken in conjunction with the accompanyingdrawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure, and in which:
Figure 1 is a view partly broken away, of a conventional automatic washing machine assembly provided with an improved agitator means according to the present invention;
~ ~, 1~`9573~
Figure 2 is a vertical cross-sectional view of the agitator means of the Canadian patent referred to above during a washing cycle showing the manner in which the clothes are ro].led over to ensure efficient contact with the wash liquid;
Figure 3 is a view in elevation of the upper agitator element shown in the assembly of Figure 2;
Figure 4 is an elevational view of a modified form of upper agitator element;
. Figure S is a view in elevation of a preferred form of agitator assembly of the present invention;
Figure 6 is a top plan view of the agitator assembly of Figure 5 mounted in a perforated basket positioned within an imperforate fluid retaining tub with an arrow adjacent the agitator axis indicating the direction of rotation of the auger agitator, and arrows indicating the movement of clothes about the axis of rotation of the auger agitator of the present invention;
Figure 7 is a cross-sectional view through the vertical axis of the washing machine tub and agitator assembly, on line VII-VII of ~igure 6, and indicating movement of the clothes, fabrics and washing ZO fluid within the tub;
Figure 8 is a perspective view of the structure of Figure 7 with a wall portion of the basket being removed to better illustrate the movement of clothes about the axis of rotation of the auger agitator; and Figure 9 is a fragmentary vertical cross-~ectional view of a modified form of the invention providing a contin- -~
uous rotary motion for the auger element of the agitator and an oscillatory motion for a skirt portion of the agitator having scrubbing vanes attached thereto.
DESCRIPTION OF T~E PREFERRED EMBODIMENTS
In Figure 1, reference numeral 10 indicates gen-erally a washing machine of the automatic type including a frame 11 carrying vertical panels 12 forming the sides, front and back of the cabinet for the washing machine 10.
A hinged lid 13 is provided in the usual manner to provide access to the interior of the washing machine. The wash-ing machine 10 has the usual console 14 including a timer dial 15 and a program selector 16.
Internally of the machine 10 there is disclosed an imperforate fluid retaining tub 17 which is supported within the washing machine cabinet by means of a base sup-port plate 18. A plu~ality of suspension rods 19 having resilient spherical end portions 20 and 21 are positioned about the tub 17 in the usual manner to suspend the tub 17 freely within the interior of the cabinet for the washing machine.
A perforate washing receptacle or basket 22 is positioned concentrically within the tub 17. Centrally of ~ the perforate washing basket 22 is an improved agitator means which has been designated generally in the drawings by the reference numeral 23.
~q~9~73~a Liquid is introduced into the washing machine by means of a solenoid controlled inlet valve 24 which direets the liquid through a conduit 25 and through an anti-siphon device 20a into the washing machine~ A filter 27 is positioned along a tub ring 28a disposed between the tub 17 which receives the washing fluid and the basket 22 whieh receives the elothing or other fabrics to be cleaned therein. A
eonduit 28b eonnects the outlet port of a pump 29 to the filter 27, and a second eonduit 28c provides fluid communi cation between the inlet port of pump 29 and the clothes washing zone within basket 22 of the washing machine. During the agitate portion of the wash cycle wash water is circulated - by the pump 29 through eonduit 28b to filter 27, from the filter into the washing zone, and from the washing zone through a seeond eonduit 28e baek to the pump 29. A filtering of the wash water is thus accomplished.
The pump 29 as well as the other movable parts of the assembly are driven by means of a motor 30 whieh oper-ates through a transmission 31. A cluteh and brake assembly generally indieated by the reference numeral 32 is provided for energizing the agitator means 23 during washing, and for disengaging the a~itator and engaging a basket spin tube, subsequently to be deseribed, for spinning the basket 22 during the liquid extraeting portion of the washing phase. All of the drive elements and hydraulic units des-cribed thus far are eonventional in vertieal-axis automatie washing maehines, and the improvements of the present in-vention are eentered in the agitator means 23, which is described specifically below.
As seen in Figure 2, the agitator means 23 has a lower agitator element 33 with a skirt portion 34 which ~?9~'734 carries a plurality of spaced, generally vertical agitator vanes 35. An agitator drive shaft 36 extends through the lower agitator element 33 and an upper agitator element 33a and is threadedly received within an agitator cap 37. The shaft 36 has a splined portion 38 which is rigidly connected to an agitator drive coupler 39 for oscillating the lower agitator element 33 in the usual manner.
A spin tube 40 surrounds the shaft 36 over a por-tion of its length and is received between spaced bearings 41 and 42. A pulley 43 is provided about the spin tube 40 for mechanical connection to a drive motor and transmission in the usual manner. The upper end of the spin tube is received within a basket drive block 44 and its associated nut 45 to drive the basket 22 at high speed during the extraction cycle when wash liquid is removed from the clothes by centrifugal force.
The upper agitator element 33a is composed of a synthetic resin or the like and, as illustrated in Figures
2 and 3 is hollow and has a larger-diameter end portion 46a in the area adjacent to the lower agitator element 33, and a smaller-diameter upper portion 46b at the upper end thereof.
As best illustrated in Figure 2, the lower end of the upper agitator element 33a is received in overlapping relationship with the upper portion of the lower agitator element 33.
The agitator drive shaft 36 extends up through the upper agitator element 33a and is mechanically coupled thereto through a one-way drive mechanism such as a one-way clutch 47 (which may be for example, a Torrington positive grip one-way roller clutch model RCB-101416) located at the upper end of the shaft 36. A sleeve bearing 48 provides l~P9573~
for relative movement between the lower agitator element 33 and the upper agitator element 33a.
The outer periphery of the upper agitator element 33a is provided with vane means 49 for urging clothes downwardly.
A continuous helical vane 49 is shown extending outwardly from the conical wall of the upper agitator element 33a down the length of the upper agitator element 33a and terminating short of the vertical agitator vanes 35 for urging or deflecting clothes downwardly. With the arrangement shown, the upper agi-tator element 33a is positively driven through one-way clutch 47 only when the ayitator drive shaft 36 is moved ln a counter-clockwise direction. Under very light loads, which may tend to be submerged adjacent the lower agitator element 33 and not in sufficient contact with the upper element 33a, the upper agi-tator element 33a will tend to oscillate with the lower agitator element 33. Elowever, as basket 22 is loaded with increasingly larger fabric loads, these larger bulk loads consistently come into greater contact with agitator vanes 49 so that when the agitator drive shaft 3~ moves in a clockwise direction, the one-way clutch 47 allows the upper agitator element to remain relatively stationary due to the frictional drag placed thereon by the water and clothes within the basket. Thus there is sub-stantially automatic sensing of the magnitude of the clothes load to provide incremental rotation under clothes load condi-tions. This incremental or intermittent rotation of the upper agitator element 33a with a clothes load provides a double action agitator and causes the helical vane 49 to act as an auger and thus auger or urge the clothes identified at reference numeral C downwardly along the upper agitator ele-ment 33a into the oscillating vertical agitator vanes 35which move the clothes out radially toward the periphery of the basket 22, thence upwardly and inwardly toward the ~q~95734 -upper agitator element 33a, all as indicated by the arrows shown in Figure 2 of the drawings. This creates a highly desirable generally toroidal rollover movement or action which subjects the clothes to intimate con-tact with the washing liquid and to effective scrubbing action from the lower agitator element 33. (In Figure 2, the washing liquid has been omitted, and only a partial clothes load has been illustrated for purposes of clarity.~
A modified form of upper agitator element 50 for use in the present invention is illustrated in Figure 4 of the drawings. This figure illustrates an upper agitator element 50 having two helical vanes 51 and 52 each having a pitch differing somewhat from the pltch of the helical vane 49 shown in detail in Figure 3 which advantageously may have one and one-quarter (1-1/4) turns over the length of upper agitator element 33a. The pitch of these helical vanes affects the rate at which clothes are moved downwardly along the upper agitator element 33a into the oscillatory path of the lower agitator element 33. A greater pitch of these helical vanes increases the rate at which fabrics are fed into the path of the lower agitator element.
In the development and evaluation of dual action agitators which, as disclosed herein, employ an upper uni-directional auger element in mutual cooperation with a lower oscillating agitator element it has been determined that the operational efficiency of, and uniformity of washability by, such agitators are substantially directly related to the magnitude of the rollover of the fabrics in a generally toroidal path during an average washing operation as produced by the cooperation of these upper and lower agitator elements.
The cooperative relationship between these upper and lower agitator elements is important since the upper auger or helical 9573~
portion continually forces or deflects the fabrics in a downwardly direction into -the oscillatory path of the lower agitator element which is thereby enabled to better clean and scrub such fabrics. However, since there are other fab-rics which have already been previously gravitationally positioned adjacent this same lower agitator elementr the continual forcing of fabrics toward the bottom portion of the agitator assembly tends to produce a concentrated mass or bulk of fabrics in the lower central portion of the wash-ing receptacle and ultimately in and around the entireoscillatory lower vaned agitator element 33.
Since the torque loads sensed by the osci].latory agitator drive shaft 36 are dependent upon the nature and mass of the fabrics engaged by the lower agitator element 33, a compacted fabric mass engaging that agitator may tend to increase the tor~ue loads sensed by drive shaft 36 and ultimately by the motor 30 powering that drive shaft. In addition, the creation of the relatively immobile, or at least slowly moving, fabric mass tends to retard or interfere with a continually progressing fabric rollover pattern which is desirable for the more uniform scrubbing of all fabrics placed wi,thin the clothes basket 22.
It is therefore important that the fabrics fed by the helical vane means ~9 downwardly toward the lower agi-tator element 33 during a first portion of the toroidal roll-over pat.tern for such fabrics also be moved radially outwardly from said agitator and upwardly along the inner sidewalls of the basket 22 in the second half portion of that desired tor-oidal cycle or rollover pattern within -that basket. The heli-cal pitch design and dimensions of the upper agitator element 73~
are therefore important in determining the downward feedrate of the upper agitator element.
The type, configuration and size characteristic of the lower vaned agitator element 33 are also significant in promoting an optimum movement of fabrics away from the lower central washing zone within basket 22. ~hereas the embodiments shown in Figures 1-4 herein illustrate the use of a rigid agitator vaned element, the embodiments shown in Figures 5-9 utilize agitator vanes of the flexible type or of a combination of flexible and rigid vanes.
The use of flexible agitator vanes on the lower agitator element allows such flexible vanes to yieldingly engage the fabrics deflected downwardly and thereby lessens the imposition of soMewhat instantaneous high impact load~
ing of the agitator, the agitator drive shaft and ultimately the motor driving it. These vanes also flex upon engagement with fabrics so as to unload fabrics which might otherwise catch on and be carried by the upper helically vaned auger element itself. This unloading of the vanes tends to avoid tangling of fabrics on the agitator which might otherwise lead to increased agitator shaft torque, increased motor wattage, reduced rollover as well as unbalanced spin loads and generally tangled clothes loads.
U.S. Patent No. 4,04S,820 issued September 20, 1977 to John W. Pielemeier and assigned to the assignee of the present invention, discloses an alternative solution to the promotion of improved rollover and consistent washability in an auger type agitator.
5~39L
SUMMARY OF THE PREFERRED EMBODIMENT OY THE INVENTION
In accordance with the principles of the preferred embodiment of the present invention, a dual action agitator comprising an upstanding center post and a lower curved trans-ition base portion area blending into an outwardly and down-wardly inclined or flared skirt is provided at circumferentially spaced points with a plurali-ty of vertically-extending flexible vanes integrally connected with the center post along an axial length of the center post as well as through the curved transition area and a portion of the skirt area. The vertically-extending flexible vanes are provided with a de-sired degree of flexibility to promote the desired degree of clothes and fabric movement away from the base of the agita-tor in cooperation with the upper auger portion as generally described above for better fabric rollover. Each of the flexible vanes terminates inwardlv of the flange of the flared skirt. Alternately spaced between the flexible vanes are smaller rigid vanes integral with and upstanding relative to the skirt. The flexible and rigid vanes and the skirt all oscillate together rotationally about the center post.
In combination with the flexible and rigid vanes on the lower part of the agitator, an auger element characterized by a cylindrical tube having a radially outwardly projecting helical vane telescopes over the upright portion of the agi-tator center post. During agitation the auger element rotates to move wash fluid and clothing downwardly adjacent the central agitator post.
It is a main object of the present invention to provide positive and rapid generally toroidal rollover or turnover movement of clothing, fabrics and washing fluid in the washing receptacle or tub, moving the clothes or fabrics downwardly adjacent the agitator post, outwardly at the bottom of the washing tub, upwardly along the sides of the tub, and inwardly at the surface of the washing fluid, all without undue tangling of the clothes load, thereby avoiding excessive agitator shaft torque, high motor wattage and the like. It is also an object of the invention to provide improved, more uniform scrubbing action to the clothing being washed.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accordance with the principles of the present invention, four flexible vanes 35a are attached integrally to the oscillatory skirt portion 34a and centerpost 70 of the agitator assembly 23a along the transition area 60 and a portion 61 of the skirt 34a. Further, each flexible vane 35a has an upper edge 135 extending generally radially out-wardly and inclined slightly from the horizontal. An outer or vertical edge 235 extends generally vertically and terminates in a lower edge 62 which extends generally radially inwardly and which is separated from a skirt 34b for a substantial portion of the length of the vane so that the free end of each vane 35a is free to flex when subjected to oscillatory forces.
It will be noted that the skirt 34b extends under each of the flexible vanes 35a and is disposed generally in a subjacent relation thereto. Moreover, each of the vanes 35a is separated from the skirt 34b along a greater portion of its length by a space between the skirt 34b and the lower edge 62 of the vane 35a, thereby to allow flexlng of the vane during a washing action. By virtue of the free or 1~95734 detached upper, outer and lower edges 135, 235, and 62, free flexing of the vanes 35a is facilitated. Therefore, under heavy wash load conditions the flexible vanes 35a yieldingly engage fabrics deflected downwardly thereby lessening high impact loading of the skirt portion 34a of the agitator assembly.
A generally cylindrical bead 80 which is greater in diameter than the thickness of the flexible vane 35a is provided on the edges 135, 235 and 62 and provides some resistance to formation of nicks and gouges in the vane which could tend to snag or catch the fabrics being washed.
Four small rigid vanes 63 are provided on the upper surface of the skirt 34b of the agitator assembly 23a.
The rigid vanes 63 are spaced equidistantly about the cir-cumference of the skirt 34b, approximately 45 offset from the four flexible vanes 35a. Each rigid vane 63 has a generally horizontal upper edge 64, and a generally vertical edge 65 which is spaced radially outwardly from the axis of the agitator assembly 23a at a slightly smaller distance than the outer part of the skirt flange 66. The vanes 63 may be hollow with cavities opening from the lower surface of the skirt 34b.
~9~i73~
Each rigid vane 63 is integrally attached along its lower edge porti~ns to the skirt 34b. The edges 64 and 65 of the rigid vanes 63 are rounded, as shown. The flexible vanes 35a and the rigid vanes 63 extend radially with respect to center post 70 of the skirt and constitute the main scrubbing vanes of agitator assembly 23a.
Coaxial with the center post 70 of the skirt and vane portion of the agitator assembly 23a is an auger tube 33b of the auger portion of the agitator assembly 23a. The dual action agitator assembly 23a is closed at the top of the auger barrel portion or tube 33b by a cap 135a. The auger tube 33b is driven about the axis of the washing machine tub 17a through a type of clutch 75 (Figure 7) at the top of the center post 70 of the skirt portion 34a, which, in turn, is driven by the oscillating drive shaft 36a. Associated with the clutch 75 are a machine screw 43a to clamp the stem 73 of the center post 70 of agitator skirt portion 34a to the upper end of the drive shaft 36a. The clutch 75 includes a coil spring 64a which bears between an upper surface of clutch member 75a of the clutch 75 and an under surface of a plate 44a which is clamped atop the stem 73 by the machine screw 43a.
One form of clutch drive which may be used in connection with the present invention is more fully described in U.S. Patent No. 4,155,228 issued May 22, 1979 to Frank R. Burgener, Jr. et al and assigned to the assignee of the present invention.
In the preferred embodiment of Figures 5-8, the drive shaft 36a rotates the center post 70 in either direction through shaft spline 71 and a cooperatively splined interior surface on center post stem portion 73. A ratchet B
1~R~ ~7 34 surface (not shown) of the clutch member 75a mounted at the top of the center post 70 engages a corresponding ratchet surface on an internal cylinder of the auger tube 33b. When the drive shaft 36a rotates to the left as shown in Figure 7, teeth (not shown) of the ratchet surface of the clutch 75 engage the valleys of the ratchet surface (not shown) in the auger tube 33b, forcing the auger tube 33b also to rotate to the left. On the return stroke of the oscillatory drive shaft 36a and center post 70, to the right, the ratchet surface on the auger tube 33b will rise vertically and slip from tooth to tooth of the ratchet rather than rotate in the reverse direction against its own momentum and the resistance of the washing fluid and articles undergoing washing about its exterior.
The outer portion of the auger tube 33b has a single helical vane 49a beginning above the normal maximum water line 39a in the tub 17a and progressing downwardly in a counter-clockwise direction in the orientation of Figure 5, so that when the auge:r tube 33b is rotated to the left in the orienta-tion of Figure 6, washing liquid and fabric articles C in theclothes basket 22a will be forced downwardly adjacent the agitator assembly 23a In operation, articles undergoing washing such as clothes and fabrics C will be placed within the clothes basket 22a within the imperforate tub 17a and the tub 17a is filled with water to the level 39a as indicated. In a washing cycle, the drive shaft 36a will rotate back and forth, in clockwise and counterclockwise directions, alternately, oscillating the skirt and vane portion 34a of the agitator assembly 23a through the driving connection formed by the engagement of the splined segment 71 of the drive shaft 36a with the splined interior surface on center post stem portion 73, onto which the center post 70 of the skirt and vane portion 34a is non-rotatably keyed or attached. Thus, the skirt and vane portion 34a oscillates within the clothes basket 22a, estab-lishing a generally radial flow pattern at the bottom of the clothes basket 22a and providing scrubbing and flexing action to the clothing C passing adjacent the skirt 34a. Simultan-eously with oscillation of the skirt portion 34a, assuming a relatively large clothes load and a proper water level for such load, the auger portion 33b of the agitator assembly 23a is moyed in step-wise rotations generally in a single direc-tion under the action of the clutch. Helical vane 49a on the exterior of the auger tube 33b forces washing liquid and clothing and the like C adjacent the upper part of the agita-tor assembly 23a in a downward direction and into the area of radially outward flow induced by the vanes 35a and 63. The clothes and fabrics C and washing fluid associated therewith therefore will flow in a generally toroidal pattern about the interior of the clothes basket 12 as indicated in Figures 6-8.
In Figure 6 th~ arrow shown on the upper surface of agitator assembly 23a indicates the clockwise direction of rota-tion of auger portion 33b. In the operation of the washing machine structure of the present invention, during washing the clothes and fabrics C undergoing washing move, or precess, in a clockwise direction around the axis of the agi-tator assembly with rollover occurring in a generally spiral toroidal pattern 23a as indicated by the arrows 80 in Figures 6 and 8. This spiral toroidal rollover pattern precessing around the vertical axis of the agitator assembly 1~9~i734 is produced by the rotary action (whether unidirectionally intermittent rotary action or continuously rotary action) of the upper agitator element and the simultaneously occurring oscillatory action of the lower vaned agitator element on the clothing and fabrics being washed within basket 22a. The flexible vanes will flex, yield, and give way under rotational loading when engaging fabrics, which action promotes the separation of such fabrics from the outer ends of those flexible vanes during their oscillatory movement. This unloading, freeing up, or unfettering of the ends of these vanes lessens the tendency for clothing to become tangled on them and ultimately on the rest of the agitator assembly.
This in turn minimizes undue concentration of immobile fabrics near these vanes at the bottom of the agitator assembly and thereby allows the relatively unfettered flexible vanes to continue to generate the desired rollover patterns within basket 22a by their propulsion action without creating high agitator shaft torque loads in doing so.
In soil removal tests of the preferred embodiment of the present invention shown in Figures 5-8, the disclosed structure demonstrated outstanding rollover of the clothes and fabrics undergoing washing as compared to conventional clothes washing machines. The entire clothes load was uniformly washed with only very narrow differences between soil removal results for various parts of the load. The test results showed less clothes tangling than would normally be expected, with no objectionable high agitator shaft torque or high motor wattage. Thus the present invention provides an im-proved dual action auger agitator which is substantially free of any clothes tangling or related problems.
l~P~73~
Figure 9 illustrates an alternative ernbodiment of my invention in which the upper helical auger agitator ele-ment is rotated continuously in one direction rather than being driven in an interrr.ittent unidirectional rotary motion such as illustrated in the embodiments of Figures 1-8. The embodiment of Figure 9 represents a modified auger mechanism over those of the prior embodiments for feeding clothing and fabrics downwardly into the path of the lower oscillatable agitator element which is oscillated in a manner and rate similarly to that for the lower agitator elements of the prior embodiments shown in Figure 1-8.
In Figure 9, the washing machine 110 (only partially shown) includes a basket or receptacle 111 provided with per-forations (not shown) and positioned within an imperforate fluid retaining tub 112. A transmission housing 113 located beneath tub 112 encloses a transmission generally identified by numeral 114. The transmission housing 113 is connected at its upper end to receptacle 111 by tubul.ar shaft 115 and is connected at its lower end to a hollow transmission input drive shaft 116.
Journalled for oscillation within the hollow shaft 115 is a tubular shaf,t 117 which is directly connec-ted to the lower vaned oscillatable agitator element 120b which i.s similar in size, function and configuration to the lower agitator element 34a shown in the embodiment of Figure 5.
Lower agitator element 120b includes four flexible vanes 118 attached to the central hub and skirt portion of agitator element 120b. One or more rigid vanes, not shown but similar to the embodiment of Figure 5 herein, may also be carried on 30 element 120b between vanes 118.
~}`~734 Journalled for rotation within tubular shaft 117 is the rotatable agitator input drive shaft 119 which extends upwardly to the top of the agitator assembly positioned within receptacle 111 and generally designated by numeral 120.
The agitator assembly 120 includes an upper agitator auger agitator element 120a, a lower agitator vaned agitator element 120b, and an agitator cap 120c threaded on the upper end of agitator shaft 119. As in the prior embodiments, the lower vaned agitator element 120b is intended for oscil-lation about its vertical axis at an optimum rate within arange of approximately 50 to 200 oscillations per minute depending upon the characteristics of the drive system desired. As in the embodiment of Figure 5 the lower agi-ta-tor element 120b includes flexible vanes 118 and a skirt 118a spaced beneath those vanes.
The upper auger agitator element 12Oa, which includes a helical vane 120d, is intended to rotate contin-uously in one direction so as to urge or force lts adjacent clothing and fabrics downwardly into the path of the lower agitator element 120b. The rotational rate of the upper auger agitator element 120a is dependent upon the size, shape, and helical pitch of the auger agitator element 120a itself but may be in the range of approximately 60 r.p.m. or less.
The function of transmission 114 is to provide a continuous rotary motion to the agitator drive shaft 119 while simultaneously providing an oscillatory motion to the tubular agitator drive shaft 117 during the agitation portion of the washing cycle of washing machine 110 in addition to providing a rotary motion to the clothes basket spin tube 115 during the fluid extraction portions of -that washing cycle.
1~95~3~
The mechanical power for producing the desired move-ments of agitator elements 120a and 120b is supplied to the rotary transmission input drive shaft 122 which is journalled within the tubular transmission input drive shaft 116 and coaxially aligned with shaft 119. Input drive shaft 122 is keyed to pinion gear 123 which drives spur gear 124 keyed to the jack shaft 125 suitably mounted for rotation on the bottom wall of transmission housing 113. Jack shaft 125 is keyed to gear 12b which provides two power paths to agitator 120. The first power path is provided through gear 127 which meshes with gear 126 and which, in turn, is keyed to the agitator drive shaft 119. The second power path is provided through the crank pin 128 which is carried by gear 126 and which journals one end of the toothed rack 129 which meshes with and drives the gear 130 which in turn is keyed to the tubular agitator drive shaft 117.
In operation during the agitation portion of the washing cycle when tubular shaft 116 and transmission housing 113 are stationary, rotation of transmission input shaft 122 in a clockwise direction, as viewed from the bottom of Figure 9, causes gears 123, 124, 126 and 129 to rotate in a direction so as to ca~se the upper auger agitator element 120a to force its surrounding fabrics and clothing downwardly toward and into the path of agita-tor element 120b.
Rotation of shaft 122 and gears 123, 125, and 126 also causes crank pin 128 to reciprocate rack 129 back and forth so as to produce an oscillatory motion of pinion gear 130 and the tubular shaft 117 to which gear 130 is keyed.
Oscillation of shaft 117 produces a similar oscillatory motion of the lower vaned agitator element 120b.
_24-During the extrac-tion portions of the washing cycle, the rotation of shaft 116 causes transmission housing 113, shaft 115 and ultimately receptacle 111 to rotate to effect the desired centrifuging operation.
While transmission 114 has been shown and described herein for illustrative purposes in driving agitator 120, it should be understood that other continuous driving mecha-nism can be utilized. It can be seen from this embodiment of Figure 9 that an auger agitator assembly has been provided wherein the upper auger agitator element is continuously rather than intermittently rotated as shown and described in the prior embodiments of my invention.
From the foregoing, it will be seen that the present invention provides an agitator means having a lower agitator element provided with flexible vanes mounted Eor oscillatory motion about an axis and an upper agitator element mounted for unidirectional rotation about the same axis, the upper agitator element havlng means associated therewith for urging clothes adjacent the upper portion down to the lower portion of the agitator means. This type of double action or dual action agitator e'speclally improves the washing action of heavy loads of clothes because the unidirectional upper portion urges the clothes down to the oscillating lower portion for positive rollover and washing action. Thus the present invention provides improved means for effectively washing a relatively large clothes load with a given amount of washing liquid thereby permitting economies in water usage, detergent usage, and power usage for heating and washing liquid. The agitator means provides good washing action for both light and heavy loads, with the oscillating lower portion -2~
1~395734 providing most of the action on the light loads. In addition, the agitator means is simple and easy to construct and can be accommodate~ on conventional drive systems. Furthermore, the pitch of vanes associated with the agitator means can be varied to change the downward movement of the clothes during agitation, thereby making the agitator means more readily adaptable to various sizes and shapes of baskets. Additionally, the drive for the auger element may be in the form of a clutch to provide intermittent stepwise rotation, or a direct dri.ve to provide continuous rotation of the auger element.
Although various other modifications might be sug-gested by those versed in the art, it should be understood that I wish to ernbody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of my contribution to the art.
As best illustrated in Figure 2, the lower end of the upper agitator element 33a is received in overlapping relationship with the upper portion of the lower agitator element 33.
The agitator drive shaft 36 extends up through the upper agitator element 33a and is mechanically coupled thereto through a one-way drive mechanism such as a one-way clutch 47 (which may be for example, a Torrington positive grip one-way roller clutch model RCB-101416) located at the upper end of the shaft 36. A sleeve bearing 48 provides l~P9573~
for relative movement between the lower agitator element 33 and the upper agitator element 33a.
The outer periphery of the upper agitator element 33a is provided with vane means 49 for urging clothes downwardly.
A continuous helical vane 49 is shown extending outwardly from the conical wall of the upper agitator element 33a down the length of the upper agitator element 33a and terminating short of the vertical agitator vanes 35 for urging or deflecting clothes downwardly. With the arrangement shown, the upper agi-tator element 33a is positively driven through one-way clutch 47 only when the ayitator drive shaft 36 is moved ln a counter-clockwise direction. Under very light loads, which may tend to be submerged adjacent the lower agitator element 33 and not in sufficient contact with the upper element 33a, the upper agi-tator element 33a will tend to oscillate with the lower agitator element 33. Elowever, as basket 22 is loaded with increasingly larger fabric loads, these larger bulk loads consistently come into greater contact with agitator vanes 49 so that when the agitator drive shaft 3~ moves in a clockwise direction, the one-way clutch 47 allows the upper agitator element to remain relatively stationary due to the frictional drag placed thereon by the water and clothes within the basket. Thus there is sub-stantially automatic sensing of the magnitude of the clothes load to provide incremental rotation under clothes load condi-tions. This incremental or intermittent rotation of the upper agitator element 33a with a clothes load provides a double action agitator and causes the helical vane 49 to act as an auger and thus auger or urge the clothes identified at reference numeral C downwardly along the upper agitator ele-ment 33a into the oscillating vertical agitator vanes 35which move the clothes out radially toward the periphery of the basket 22, thence upwardly and inwardly toward the ~q~95734 -upper agitator element 33a, all as indicated by the arrows shown in Figure 2 of the drawings. This creates a highly desirable generally toroidal rollover movement or action which subjects the clothes to intimate con-tact with the washing liquid and to effective scrubbing action from the lower agitator element 33. (In Figure 2, the washing liquid has been omitted, and only a partial clothes load has been illustrated for purposes of clarity.~
A modified form of upper agitator element 50 for use in the present invention is illustrated in Figure 4 of the drawings. This figure illustrates an upper agitator element 50 having two helical vanes 51 and 52 each having a pitch differing somewhat from the pltch of the helical vane 49 shown in detail in Figure 3 which advantageously may have one and one-quarter (1-1/4) turns over the length of upper agitator element 33a. The pitch of these helical vanes affects the rate at which clothes are moved downwardly along the upper agitator element 33a into the oscillatory path of the lower agitator element 33. A greater pitch of these helical vanes increases the rate at which fabrics are fed into the path of the lower agitator element.
In the development and evaluation of dual action agitators which, as disclosed herein, employ an upper uni-directional auger element in mutual cooperation with a lower oscillating agitator element it has been determined that the operational efficiency of, and uniformity of washability by, such agitators are substantially directly related to the magnitude of the rollover of the fabrics in a generally toroidal path during an average washing operation as produced by the cooperation of these upper and lower agitator elements.
The cooperative relationship between these upper and lower agitator elements is important since the upper auger or helical 9573~
portion continually forces or deflects the fabrics in a downwardly direction into -the oscillatory path of the lower agitator element which is thereby enabled to better clean and scrub such fabrics. However, since there are other fab-rics which have already been previously gravitationally positioned adjacent this same lower agitator elementr the continual forcing of fabrics toward the bottom portion of the agitator assembly tends to produce a concentrated mass or bulk of fabrics in the lower central portion of the wash-ing receptacle and ultimately in and around the entireoscillatory lower vaned agitator element 33.
Since the torque loads sensed by the osci].latory agitator drive shaft 36 are dependent upon the nature and mass of the fabrics engaged by the lower agitator element 33, a compacted fabric mass engaging that agitator may tend to increase the tor~ue loads sensed by drive shaft 36 and ultimately by the motor 30 powering that drive shaft. In addition, the creation of the relatively immobile, or at least slowly moving, fabric mass tends to retard or interfere with a continually progressing fabric rollover pattern which is desirable for the more uniform scrubbing of all fabrics placed wi,thin the clothes basket 22.
It is therefore important that the fabrics fed by the helical vane means ~9 downwardly toward the lower agi-tator element 33 during a first portion of the toroidal roll-over pat.tern for such fabrics also be moved radially outwardly from said agitator and upwardly along the inner sidewalls of the basket 22 in the second half portion of that desired tor-oidal cycle or rollover pattern within -that basket. The heli-cal pitch design and dimensions of the upper agitator element 73~
are therefore important in determining the downward feedrate of the upper agitator element.
The type, configuration and size characteristic of the lower vaned agitator element 33 are also significant in promoting an optimum movement of fabrics away from the lower central washing zone within basket 22. ~hereas the embodiments shown in Figures 1-4 herein illustrate the use of a rigid agitator vaned element, the embodiments shown in Figures 5-9 utilize agitator vanes of the flexible type or of a combination of flexible and rigid vanes.
The use of flexible agitator vanes on the lower agitator element allows such flexible vanes to yieldingly engage the fabrics deflected downwardly and thereby lessens the imposition of soMewhat instantaneous high impact load~
ing of the agitator, the agitator drive shaft and ultimately the motor driving it. These vanes also flex upon engagement with fabrics so as to unload fabrics which might otherwise catch on and be carried by the upper helically vaned auger element itself. This unloading of the vanes tends to avoid tangling of fabrics on the agitator which might otherwise lead to increased agitator shaft torque, increased motor wattage, reduced rollover as well as unbalanced spin loads and generally tangled clothes loads.
U.S. Patent No. 4,04S,820 issued September 20, 1977 to John W. Pielemeier and assigned to the assignee of the present invention, discloses an alternative solution to the promotion of improved rollover and consistent washability in an auger type agitator.
5~39L
SUMMARY OF THE PREFERRED EMBODIMENT OY THE INVENTION
In accordance with the principles of the preferred embodiment of the present invention, a dual action agitator comprising an upstanding center post and a lower curved trans-ition base portion area blending into an outwardly and down-wardly inclined or flared skirt is provided at circumferentially spaced points with a plurali-ty of vertically-extending flexible vanes integrally connected with the center post along an axial length of the center post as well as through the curved transition area and a portion of the skirt area. The vertically-extending flexible vanes are provided with a de-sired degree of flexibility to promote the desired degree of clothes and fabric movement away from the base of the agita-tor in cooperation with the upper auger portion as generally described above for better fabric rollover. Each of the flexible vanes terminates inwardlv of the flange of the flared skirt. Alternately spaced between the flexible vanes are smaller rigid vanes integral with and upstanding relative to the skirt. The flexible and rigid vanes and the skirt all oscillate together rotationally about the center post.
In combination with the flexible and rigid vanes on the lower part of the agitator, an auger element characterized by a cylindrical tube having a radially outwardly projecting helical vane telescopes over the upright portion of the agi-tator center post. During agitation the auger element rotates to move wash fluid and clothing downwardly adjacent the central agitator post.
It is a main object of the present invention to provide positive and rapid generally toroidal rollover or turnover movement of clothing, fabrics and washing fluid in the washing receptacle or tub, moving the clothes or fabrics downwardly adjacent the agitator post, outwardly at the bottom of the washing tub, upwardly along the sides of the tub, and inwardly at the surface of the washing fluid, all without undue tangling of the clothes load, thereby avoiding excessive agitator shaft torque, high motor wattage and the like. It is also an object of the invention to provide improved, more uniform scrubbing action to the clothing being washed.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In accordance with the principles of the present invention, four flexible vanes 35a are attached integrally to the oscillatory skirt portion 34a and centerpost 70 of the agitator assembly 23a along the transition area 60 and a portion 61 of the skirt 34a. Further, each flexible vane 35a has an upper edge 135 extending generally radially out-wardly and inclined slightly from the horizontal. An outer or vertical edge 235 extends generally vertically and terminates in a lower edge 62 which extends generally radially inwardly and which is separated from a skirt 34b for a substantial portion of the length of the vane so that the free end of each vane 35a is free to flex when subjected to oscillatory forces.
It will be noted that the skirt 34b extends under each of the flexible vanes 35a and is disposed generally in a subjacent relation thereto. Moreover, each of the vanes 35a is separated from the skirt 34b along a greater portion of its length by a space between the skirt 34b and the lower edge 62 of the vane 35a, thereby to allow flexlng of the vane during a washing action. By virtue of the free or 1~95734 detached upper, outer and lower edges 135, 235, and 62, free flexing of the vanes 35a is facilitated. Therefore, under heavy wash load conditions the flexible vanes 35a yieldingly engage fabrics deflected downwardly thereby lessening high impact loading of the skirt portion 34a of the agitator assembly.
A generally cylindrical bead 80 which is greater in diameter than the thickness of the flexible vane 35a is provided on the edges 135, 235 and 62 and provides some resistance to formation of nicks and gouges in the vane which could tend to snag or catch the fabrics being washed.
Four small rigid vanes 63 are provided on the upper surface of the skirt 34b of the agitator assembly 23a.
The rigid vanes 63 are spaced equidistantly about the cir-cumference of the skirt 34b, approximately 45 offset from the four flexible vanes 35a. Each rigid vane 63 has a generally horizontal upper edge 64, and a generally vertical edge 65 which is spaced radially outwardly from the axis of the agitator assembly 23a at a slightly smaller distance than the outer part of the skirt flange 66. The vanes 63 may be hollow with cavities opening from the lower surface of the skirt 34b.
~9~i73~
Each rigid vane 63 is integrally attached along its lower edge porti~ns to the skirt 34b. The edges 64 and 65 of the rigid vanes 63 are rounded, as shown. The flexible vanes 35a and the rigid vanes 63 extend radially with respect to center post 70 of the skirt and constitute the main scrubbing vanes of agitator assembly 23a.
Coaxial with the center post 70 of the skirt and vane portion of the agitator assembly 23a is an auger tube 33b of the auger portion of the agitator assembly 23a. The dual action agitator assembly 23a is closed at the top of the auger barrel portion or tube 33b by a cap 135a. The auger tube 33b is driven about the axis of the washing machine tub 17a through a type of clutch 75 (Figure 7) at the top of the center post 70 of the skirt portion 34a, which, in turn, is driven by the oscillating drive shaft 36a. Associated with the clutch 75 are a machine screw 43a to clamp the stem 73 of the center post 70 of agitator skirt portion 34a to the upper end of the drive shaft 36a. The clutch 75 includes a coil spring 64a which bears between an upper surface of clutch member 75a of the clutch 75 and an under surface of a plate 44a which is clamped atop the stem 73 by the machine screw 43a.
One form of clutch drive which may be used in connection with the present invention is more fully described in U.S. Patent No. 4,155,228 issued May 22, 1979 to Frank R. Burgener, Jr. et al and assigned to the assignee of the present invention.
In the preferred embodiment of Figures 5-8, the drive shaft 36a rotates the center post 70 in either direction through shaft spline 71 and a cooperatively splined interior surface on center post stem portion 73. A ratchet B
1~R~ ~7 34 surface (not shown) of the clutch member 75a mounted at the top of the center post 70 engages a corresponding ratchet surface on an internal cylinder of the auger tube 33b. When the drive shaft 36a rotates to the left as shown in Figure 7, teeth (not shown) of the ratchet surface of the clutch 75 engage the valleys of the ratchet surface (not shown) in the auger tube 33b, forcing the auger tube 33b also to rotate to the left. On the return stroke of the oscillatory drive shaft 36a and center post 70, to the right, the ratchet surface on the auger tube 33b will rise vertically and slip from tooth to tooth of the ratchet rather than rotate in the reverse direction against its own momentum and the resistance of the washing fluid and articles undergoing washing about its exterior.
The outer portion of the auger tube 33b has a single helical vane 49a beginning above the normal maximum water line 39a in the tub 17a and progressing downwardly in a counter-clockwise direction in the orientation of Figure 5, so that when the auge:r tube 33b is rotated to the left in the orienta-tion of Figure 6, washing liquid and fabric articles C in theclothes basket 22a will be forced downwardly adjacent the agitator assembly 23a In operation, articles undergoing washing such as clothes and fabrics C will be placed within the clothes basket 22a within the imperforate tub 17a and the tub 17a is filled with water to the level 39a as indicated. In a washing cycle, the drive shaft 36a will rotate back and forth, in clockwise and counterclockwise directions, alternately, oscillating the skirt and vane portion 34a of the agitator assembly 23a through the driving connection formed by the engagement of the splined segment 71 of the drive shaft 36a with the splined interior surface on center post stem portion 73, onto which the center post 70 of the skirt and vane portion 34a is non-rotatably keyed or attached. Thus, the skirt and vane portion 34a oscillates within the clothes basket 22a, estab-lishing a generally radial flow pattern at the bottom of the clothes basket 22a and providing scrubbing and flexing action to the clothing C passing adjacent the skirt 34a. Simultan-eously with oscillation of the skirt portion 34a, assuming a relatively large clothes load and a proper water level for such load, the auger portion 33b of the agitator assembly 23a is moyed in step-wise rotations generally in a single direc-tion under the action of the clutch. Helical vane 49a on the exterior of the auger tube 33b forces washing liquid and clothing and the like C adjacent the upper part of the agita-tor assembly 23a in a downward direction and into the area of radially outward flow induced by the vanes 35a and 63. The clothes and fabrics C and washing fluid associated therewith therefore will flow in a generally toroidal pattern about the interior of the clothes basket 12 as indicated in Figures 6-8.
In Figure 6 th~ arrow shown on the upper surface of agitator assembly 23a indicates the clockwise direction of rota-tion of auger portion 33b. In the operation of the washing machine structure of the present invention, during washing the clothes and fabrics C undergoing washing move, or precess, in a clockwise direction around the axis of the agi-tator assembly with rollover occurring in a generally spiral toroidal pattern 23a as indicated by the arrows 80 in Figures 6 and 8. This spiral toroidal rollover pattern precessing around the vertical axis of the agitator assembly 1~9~i734 is produced by the rotary action (whether unidirectionally intermittent rotary action or continuously rotary action) of the upper agitator element and the simultaneously occurring oscillatory action of the lower vaned agitator element on the clothing and fabrics being washed within basket 22a. The flexible vanes will flex, yield, and give way under rotational loading when engaging fabrics, which action promotes the separation of such fabrics from the outer ends of those flexible vanes during their oscillatory movement. This unloading, freeing up, or unfettering of the ends of these vanes lessens the tendency for clothing to become tangled on them and ultimately on the rest of the agitator assembly.
This in turn minimizes undue concentration of immobile fabrics near these vanes at the bottom of the agitator assembly and thereby allows the relatively unfettered flexible vanes to continue to generate the desired rollover patterns within basket 22a by their propulsion action without creating high agitator shaft torque loads in doing so.
In soil removal tests of the preferred embodiment of the present invention shown in Figures 5-8, the disclosed structure demonstrated outstanding rollover of the clothes and fabrics undergoing washing as compared to conventional clothes washing machines. The entire clothes load was uniformly washed with only very narrow differences between soil removal results for various parts of the load. The test results showed less clothes tangling than would normally be expected, with no objectionable high agitator shaft torque or high motor wattage. Thus the present invention provides an im-proved dual action auger agitator which is substantially free of any clothes tangling or related problems.
l~P~73~
Figure 9 illustrates an alternative ernbodiment of my invention in which the upper helical auger agitator ele-ment is rotated continuously in one direction rather than being driven in an interrr.ittent unidirectional rotary motion such as illustrated in the embodiments of Figures 1-8. The embodiment of Figure 9 represents a modified auger mechanism over those of the prior embodiments for feeding clothing and fabrics downwardly into the path of the lower oscillatable agitator element which is oscillated in a manner and rate similarly to that for the lower agitator elements of the prior embodiments shown in Figure 1-8.
In Figure 9, the washing machine 110 (only partially shown) includes a basket or receptacle 111 provided with per-forations (not shown) and positioned within an imperforate fluid retaining tub 112. A transmission housing 113 located beneath tub 112 encloses a transmission generally identified by numeral 114. The transmission housing 113 is connected at its upper end to receptacle 111 by tubul.ar shaft 115 and is connected at its lower end to a hollow transmission input drive shaft 116.
Journalled for oscillation within the hollow shaft 115 is a tubular shaf,t 117 which is directly connec-ted to the lower vaned oscillatable agitator element 120b which i.s similar in size, function and configuration to the lower agitator element 34a shown in the embodiment of Figure 5.
Lower agitator element 120b includes four flexible vanes 118 attached to the central hub and skirt portion of agitator element 120b. One or more rigid vanes, not shown but similar to the embodiment of Figure 5 herein, may also be carried on 30 element 120b between vanes 118.
~}`~734 Journalled for rotation within tubular shaft 117 is the rotatable agitator input drive shaft 119 which extends upwardly to the top of the agitator assembly positioned within receptacle 111 and generally designated by numeral 120.
The agitator assembly 120 includes an upper agitator auger agitator element 120a, a lower agitator vaned agitator element 120b, and an agitator cap 120c threaded on the upper end of agitator shaft 119. As in the prior embodiments, the lower vaned agitator element 120b is intended for oscil-lation about its vertical axis at an optimum rate within arange of approximately 50 to 200 oscillations per minute depending upon the characteristics of the drive system desired. As in the embodiment of Figure 5 the lower agi-ta-tor element 120b includes flexible vanes 118 and a skirt 118a spaced beneath those vanes.
The upper auger agitator element 12Oa, which includes a helical vane 120d, is intended to rotate contin-uously in one direction so as to urge or force lts adjacent clothing and fabrics downwardly into the path of the lower agitator element 120b. The rotational rate of the upper auger agitator element 120a is dependent upon the size, shape, and helical pitch of the auger agitator element 120a itself but may be in the range of approximately 60 r.p.m. or less.
The function of transmission 114 is to provide a continuous rotary motion to the agitator drive shaft 119 while simultaneously providing an oscillatory motion to the tubular agitator drive shaft 117 during the agitation portion of the washing cycle of washing machine 110 in addition to providing a rotary motion to the clothes basket spin tube 115 during the fluid extraction portions of -that washing cycle.
1~95~3~
The mechanical power for producing the desired move-ments of agitator elements 120a and 120b is supplied to the rotary transmission input drive shaft 122 which is journalled within the tubular transmission input drive shaft 116 and coaxially aligned with shaft 119. Input drive shaft 122 is keyed to pinion gear 123 which drives spur gear 124 keyed to the jack shaft 125 suitably mounted for rotation on the bottom wall of transmission housing 113. Jack shaft 125 is keyed to gear 12b which provides two power paths to agitator 120. The first power path is provided through gear 127 which meshes with gear 126 and which, in turn, is keyed to the agitator drive shaft 119. The second power path is provided through the crank pin 128 which is carried by gear 126 and which journals one end of the toothed rack 129 which meshes with and drives the gear 130 which in turn is keyed to the tubular agitator drive shaft 117.
In operation during the agitation portion of the washing cycle when tubular shaft 116 and transmission housing 113 are stationary, rotation of transmission input shaft 122 in a clockwise direction, as viewed from the bottom of Figure 9, causes gears 123, 124, 126 and 129 to rotate in a direction so as to ca~se the upper auger agitator element 120a to force its surrounding fabrics and clothing downwardly toward and into the path of agita-tor element 120b.
Rotation of shaft 122 and gears 123, 125, and 126 also causes crank pin 128 to reciprocate rack 129 back and forth so as to produce an oscillatory motion of pinion gear 130 and the tubular shaft 117 to which gear 130 is keyed.
Oscillation of shaft 117 produces a similar oscillatory motion of the lower vaned agitator element 120b.
_24-During the extrac-tion portions of the washing cycle, the rotation of shaft 116 causes transmission housing 113, shaft 115 and ultimately receptacle 111 to rotate to effect the desired centrifuging operation.
While transmission 114 has been shown and described herein for illustrative purposes in driving agitator 120, it should be understood that other continuous driving mecha-nism can be utilized. It can be seen from this embodiment of Figure 9 that an auger agitator assembly has been provided wherein the upper auger agitator element is continuously rather than intermittently rotated as shown and described in the prior embodiments of my invention.
From the foregoing, it will be seen that the present invention provides an agitator means having a lower agitator element provided with flexible vanes mounted Eor oscillatory motion about an axis and an upper agitator element mounted for unidirectional rotation about the same axis, the upper agitator element havlng means associated therewith for urging clothes adjacent the upper portion down to the lower portion of the agitator means. This type of double action or dual action agitator e'speclally improves the washing action of heavy loads of clothes because the unidirectional upper portion urges the clothes down to the oscillating lower portion for positive rollover and washing action. Thus the present invention provides improved means for effectively washing a relatively large clothes load with a given amount of washing liquid thereby permitting economies in water usage, detergent usage, and power usage for heating and washing liquid. The agitator means provides good washing action for both light and heavy loads, with the oscillating lower portion -2~
1~395734 providing most of the action on the light loads. In addition, the agitator means is simple and easy to construct and can be accommodate~ on conventional drive systems. Furthermore, the pitch of vanes associated with the agitator means can be varied to change the downward movement of the clothes during agitation, thereby making the agitator means more readily adaptable to various sizes and shapes of baskets. Additionally, the drive for the auger element may be in the form of a clutch to provide intermittent stepwise rotation, or a direct dri.ve to provide continuous rotation of the auger element.
Although various other modifications might be sug-gested by those versed in the art, it should be understood that I wish to ernbody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of my contribution to the art.
Claims (14)
1. An agitator assembly for a clothes washing machine comprising:
a first agitator element, a second agitator element, drive means for driving said first agitator element in an oscillatory motion and for concurrently driving said second agitator element in an unidirectional rotary motion, said first and second agitator elements cooperating to circulate the contents of the machine in a toroidal rollover pattern within the washing machine, and means associated with said second agitator element for forcing articles adjacent thereto into the oscillatory path of said first agitator element and into said rollover pattern, said first agitator element having formed thereon flexible vanes which are free to flex in response to oscillatory motions of the agitator element, thereby to yieldingly engage fabrics deflected downwardly and lessening high impact loading of the first agitator element.
a first agitator element, a second agitator element, drive means for driving said first agitator element in an oscillatory motion and for concurrently driving said second agitator element in an unidirectional rotary motion, said first and second agitator elements cooperating to circulate the contents of the machine in a toroidal rollover pattern within the washing machine, and means associated with said second agitator element for forcing articles adjacent thereto into the oscillatory path of said first agitator element and into said rollover pattern, said first agitator element having formed thereon flexible vanes which are free to flex in response to oscillatory motions of the agitator element, thereby to yieldingly engage fabrics deflected downwardly and lessening high impact loading of the first agitator element.
2. An agitator assembly as defined in claim 1, wherein said first agitator element is provided with a skirt spaced subjacent said flexible vanes which extends under each of said flexible vanes.
3. An agitator assembly as defined in claim 2, further defined by each of said flexible vanes being sepa-rated from said skirt along a greater portion of its length by a space between said skirt and said vane, thereby to allow flexing of said flexible vane during washing action.
4. An agitator assembly as defined in claim 3, wherein said flexible vanes each have free or detached upper, outer, and lower edges to facilitate free flexing of said flexible vane during washing action.
5. An agitator assembly as defined in claim 1, wherein said drive means is constructed and arranged to intermittently drive said second agitator element.
6. An agitator assembly as defined in claim 1, wherein said drive means is constructed and arranged to continuously drive said second agitator element.
7. In a clothes washing machine of the vertical axis type having a washing receptacle for receiving washing liquid and fabrics to be washed, agitator means within said receptacle for washing fabrics and for generating a rollover motion to said fabrics, during washing of the fabrics, and drive means for driving said agitator means, said agitator means comprising:
a lower agitator element driven by said drive means in an oscillatory motion on said vertical axis, an upper agitator element mounted on said vertical axis above said lower agitator element, said upper agitator element being positively and unidirectionally rotated by said drive means on said vertical axis, means on said upper agitator element for deflecting said fabrics downwardly toward said lower agitator element in a first portion of a toroidal rollover pattern for said fabrics by the coaction of said upper and lower elements, said lower agitator elements including a plurality of circumferentially-spaced, radially-extending, flexible vanes having relatively free end portions positioned outwardly from said vertical axis, and a skirt portion closely positioned beneath said end portions whereby said end portions may flex relative to said skirt portion upon oscillation of said lower agitator element and yieldingly propel said fabrics away from said vertical axis and into a second portion of said toroidal rollover pattern so as to be reengaged by said upper agitator element and thereby generate a continuous rollover motion of said fabrics.
a lower agitator element driven by said drive means in an oscillatory motion on said vertical axis, an upper agitator element mounted on said vertical axis above said lower agitator element, said upper agitator element being positively and unidirectionally rotated by said drive means on said vertical axis, means on said upper agitator element for deflecting said fabrics downwardly toward said lower agitator element in a first portion of a toroidal rollover pattern for said fabrics by the coaction of said upper and lower elements, said lower agitator elements including a plurality of circumferentially-spaced, radially-extending, flexible vanes having relatively free end portions positioned outwardly from said vertical axis, and a skirt portion closely positioned beneath said end portions whereby said end portions may flex relative to said skirt portion upon oscillation of said lower agitator element and yieldingly propel said fabrics away from said vertical axis and into a second portion of said toroidal rollover pattern so as to be reengaged by said upper agitator element and thereby generate a continuous rollover motion of said fabrics.
8. The invention set forth in claim 7 wherein said drive means includes a drive member which is directly connected to said upper agitator element and constructed and arranged such that said upper agitator element is continuously rotated in one direction on said vertical axis during washing of fabrics.
9. In an automatic washer having a washing receptacle for containing washing liquid and the items to be washed, agitator means within said receptacle for imparting a rollover motion to said items to be washed, and drive means for driving said agitator means, said agitator means comprising:
a lower agitator element driven by the drive means in an oscillatory manner, an upper agitator element mounted above the lower agitator element and coaxial therewith, said upper agitator element being positively rota-tionally driven by the drive means in one direction only, means associated with the upper agitator element for imparting a downward motion to the items to be washed, and flexible vane means associated with the lower agitator element to yieldingly flex under heavy wash load conditions to minimize tangling of items to be washed due to the movement of said upper agitator element in said one direction only.
a lower agitator element driven by the drive means in an oscillatory manner, an upper agitator element mounted above the lower agitator element and coaxial therewith, said upper agitator element being positively rota-tionally driven by the drive means in one direction only, means associated with the upper agitator element for imparting a downward motion to the items to be washed, and flexible vane means associated with the lower agitator element to yieldingly flex under heavy wash load conditions to minimize tangling of items to be washed due to the movement of said upper agitator element in said one direction only.
10. An agitator assembly for use within a vertical axis washing machine adapted to receive washing fluid and fabrics to be washed within said washing fluid, said agitator assembly comprising:
a first agitator member including means for receiving an oscillatory input drive member from said machine for imparting an oscillatory motion to said first agitator member, a second agitator member having fabric deflecting means thereon mounted adjacent said first agitator member and movable relative thereto for urging fabrics positioned adjacent said fabric deflecting means within said washing fluid toward said first agitator member in a generally toroidal fluid circulatory path to effect a scrubbing of said fabrics by said first agitator member, said second agitator member having drive means connected thereto for moving said second agitator member as a separate unidirectional rotational movement relative to said first agitator member, and flexible vane means on said first agitator element for uniformly scrubbing the fabrics to be washed while yieldingly flexing under relatively heavy load conditions thereby preventing any undue tangling of the fabrics caused by the unidirec-tional rotational movement of said second agitator member relative to said first agitator element.
a first agitator member including means for receiving an oscillatory input drive member from said machine for imparting an oscillatory motion to said first agitator member, a second agitator member having fabric deflecting means thereon mounted adjacent said first agitator member and movable relative thereto for urging fabrics positioned adjacent said fabric deflecting means within said washing fluid toward said first agitator member in a generally toroidal fluid circulatory path to effect a scrubbing of said fabrics by said first agitator member, said second agitator member having drive means connected thereto for moving said second agitator member as a separate unidirectional rotational movement relative to said first agitator member, and flexible vane means on said first agitator element for uniformly scrubbing the fabrics to be washed while yieldingly flexing under relatively heavy load conditions thereby preventing any undue tangling of the fabrics caused by the unidirec-tional rotational movement of said second agitator member relative to said first agitator element.
11. In an automatic washer having a clothes washing receptacle, agitator means within said receptacle, and drive means having a drive shaft engageable with said agitator means, an improvement in said agitator means comprising:
a lower agitator element connected to said drive shaft for oscillating motion therewith, an upper agitator element disposed above the lower agitator element and coaxial therewith, means interconnecting said upper agitator element with said drive means for unidirectional rotation of said upper agitator element, and means on said lower agitator element for scrubbing clothes and for alleviating any tendency for tangling of the clothes occasioned by the unidirectional rotation of said upper agitator element, said means on said lower agitator element comprising a plurality of flexible vanes constructed and arranged to yieldingly flex under relatively heavy clothes wash load conditions.
a lower agitator element connected to said drive shaft for oscillating motion therewith, an upper agitator element disposed above the lower agitator element and coaxial therewith, means interconnecting said upper agitator element with said drive means for unidirectional rotation of said upper agitator element, and means on said lower agitator element for scrubbing clothes and for alleviating any tendency for tangling of the clothes occasioned by the unidirectional rotation of said upper agitator element, said means on said lower agitator element comprising a plurality of flexible vanes constructed and arranged to yieldingly flex under relatively heavy clothes wash load conditions.
12. An agitator assembly for a clothes washing machine of the type comprising first and second agitator elements respectively driven in oscillatory and unidirectional rotary motions to circulate the contents of the machine in a toroidal rollover pattern within the washing machine and wherein the second agitator element has means for forcing articles adjacent thereto into the oscillatory path of the first agitator element and into the rollover pattern, the improvement wherein said first agitator element has formed thereon flexible vanes which are free to flex in response to oscillatory motions of the first agitator element, thereby to yieldingly engage fabrics deflected downwardly and lessen high impact loading of the first agitator element.
13. In a washing machine of the vertical axis type having an agitator assembly comprising in combination with a skirt and vane portion oscillatable about an axis and having a plurality of radial vanes spaced about said axis and an auger portion rotatable in one direction about said axis and having a radially extending vane forming a helix about said axis to provide positive toroidal rollover of the clothing in the machines, the improvement of a plurality of vanes for said agitator assembly spaced circum-ferentially of one another and each of said plurality of said vanes having free and detached upper, outer and lower edges to facilitate free flexing of said vanes relative to the skirt during washing to yieldingly engage downwardly deflected materials and lessening high impact loading of said skirt and vane portion of said agitator assembly.
14. In a washing machine of the vertical axis type having an agitator assembly comprising in combination with a skirt and vane portion oscillatable about an axis and having a plurality of radial vanes spaced about said axis and an auger portion rotatable in one direction about said axis and having a radially extending vane forming a helix about said axis to provide positive toroidal rollover of the clothing in the machine, the improvement of a plurality of vanes for said agitator assembly having free and detached upper, outer and lower edges to facilitate free flexing of said vanes relative to said skirt during washing to yieldingly engage downwardly deflected materials and lessening high impact loading of said skirt and vane portion of said agitator assembly, and a continuous, unidirectional driving means for continuously rotating said auger portion during a washing operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/696,746 US4068503A (en) | 1975-07-14 | 1976-06-16 | Combined oscillating and unidirectional agitator for automatic washer |
| US696,746 | 1976-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1095734A true CA1095734A (en) | 1981-02-17 |
Family
ID=24798368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,334A Expired CA1095734A (en) | 1976-06-16 | 1977-05-27 | Combined oscillating and unidirectional agitator for automatic washer |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5325072A (en) |
| AU (1) | AU512667B2 (en) |
| BR (1) | BR7703906A (en) |
| CA (1) | CA1095734A (en) |
| GB (1) | GB1562543A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6311527B1 (en) | 1998-05-12 | 2001-11-06 | Notetry Limited | Method and apparatus for containing and agitating the contents of a container |
| US6854300B2 (en) | 1998-05-12 | 2005-02-15 | Dyson Limited | Method and apparatus for containing and agitating the contents of a container |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5922678U (en) * | 1982-08-04 | 1984-02-13 | 株式会社東芝 | washing machine |
| JPS6391284U (en) * | 1986-12-01 | 1988-06-13 | ||
| JPS6391285U (en) * | 1986-12-01 | 1988-06-13 | ||
| GB2233350A (en) * | 1989-06-28 | 1991-01-09 | Lee Jung Chao | Ultrasonic washing machine |
| WO2003033803A1 (en) | 2001-10-18 | 2003-04-24 | Haier Group Corporation | Counter-rotation wash method and transmission machine |
| KR20220021707A (en) * | 2020-08-14 | 2022-02-22 | 엘지전자 주식회사 | Laundry Treatment Apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1045401A (en) * | 1973-11-23 | 1979-01-02 | Whirlpool Corporation | Combined oscillating and unidirectional agitator for automatic washer |
-
1977
- 1977-05-16 GB GB2055977A patent/GB1562543A/en not_active Expired
- 1977-05-27 CA CA279,334A patent/CA1095734A/en not_active Expired
- 1977-06-02 AU AU25794/77A patent/AU512667B2/en not_active Expired
- 1977-06-15 BR BR7703906A patent/BR7703906A/en unknown
- 1977-06-16 JP JP7059377A patent/JPS5325072A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6311527B1 (en) | 1998-05-12 | 2001-11-06 | Notetry Limited | Method and apparatus for containing and agitating the contents of a container |
| US6381790B2 (en) | 1998-05-12 | 2002-05-07 | Dyson Limited | Method and apparatus for containing and agitating the contents of a container |
| US6497123B2 (en) | 1998-05-12 | 2002-12-24 | Dyson Limited | Method and apparatus for containing and agitating the contents of a container |
| US6854300B2 (en) | 1998-05-12 | 2005-02-15 | Dyson Limited | Method and apparatus for containing and agitating the contents of a container |
| US7197901B2 (en) | 1998-05-12 | 2007-04-03 | Dyson Technology Limited | Washing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5325072A (en) | 1978-03-08 |
| AU512667B2 (en) | 1980-10-23 |
| BR7703906A (en) | 1979-02-28 |
| AU2579477A (en) | 1978-12-07 |
| GB1562543A (en) | 1980-03-12 |
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