CA1164215A - Dust control method and system - Google Patents
Dust control method and systemInfo
- Publication number
- CA1164215A CA1164215A CA000400273A CA400273A CA1164215A CA 1164215 A CA1164215 A CA 1164215A CA 000400273 A CA000400273 A CA 000400273A CA 400273 A CA400273 A CA 400273A CA 1164215 A CA1164215 A CA 1164215A
- Authority
- CA
- Canada
- Prior art keywords
- dust
- fan
- dustless
- machine
- selectively
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
- B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
- B24B55/105—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with oscillating tools
Abstract
DUST CONTROL METHOD AND SYSTEM
ABSTRACT
An electrically driven portable surface treating machine such as a sander, polisher, buffer, and the like, having an oscillatable platen driven from a motor shaft and which creates dust during use, is provided with a dust col-lection fan on the motor shaft in a fan housing portion of the tool housing and an exhaust outlet or port which can selectively be fitted with dust collection means, such as a filter bag. The oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collection fan housing portion. Between the shroud and the fan, there is provided a selective shutter arrangement which may be selectively opened and closed by the machine operator to enable the machine to be operated in either a "dustless" or a "non-dustless" configuration or mode of operation.
ABSTRACT
An electrically driven portable surface treating machine such as a sander, polisher, buffer, and the like, having an oscillatable platen driven from a motor shaft and which creates dust during use, is provided with a dust col-lection fan on the motor shaft in a fan housing portion of the tool housing and an exhaust outlet or port which can selectively be fitted with dust collection means, such as a filter bag. The oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collection fan housing portion. Between the shroud and the fan, there is provided a selective shutter arrangement which may be selectively opened and closed by the machine operator to enable the machine to be operated in either a "dustless" or a "non-dustless" configuration or mode of operation.
Description
EAI,/lm i DUST CONTROL METHOD AND SYST_ DESCRIPTION
FIELD OF THE INVENTION
This invention relates to electrically driven portable surface cleaning machines such as a sander~ polisher, buffer, and the like having an oscillatable platen which creates dust during use and to a dust control method and system therefore.
BACKGROUND OF THE INVENTION
Electrically driven portable surface treating machines such as a sander, polisher, buffer, and the like having an oscillatable platen may create dust during use which in many machines is allowed to merely enter the ambient air in the work area. While this is satisfactory under some conditions, under other conditions it is desirable that the dust created be removed from the work area and not be allowed to enter the ambient air therearound. There has been a long standing need for improving the construction or arrangement of such machines so as to selectively provide for the collection of such dust when desired while enabling the machine to be easily and safely operated without dust collection when that mode of operation is satisfactory. A number of dust collec-tion bags and systems have been proposed and, for example, in U.S. Pa-tent No. 3,938,283, assigned to the assignee of the instant application, there is disclosed a dust collection system including a vacuum fan driven by the machine's elec-tric motor together with a shroud or skirt enclosing the oscillatable platen. The fan creates suction past the oscillatable platen and within the shroud or skirt to vacuum the dust away from the platen as it is created. An exhaust conduit is also provided supporting a dust collection filter bag and a support arm therefore. Such an arrangement, with the dust bag in place, may be referred to as a "dustless"
machine.
While effective to collect the dust which the machine creates, the additional bulk of the dust bag and support can, under certain conditions of operation, reduce the convenience of using the machine. Moreover, in some applications the dust collection capability is just not desired by the ma-chine operator. In addition, the basic machine, without the dust collection bag and support may be sold more econom-ically, giving the purchaser the option of later purchasing a dust collection bag as an accessory if "dustless" or "non-dustless" operation of the basic machine can be conveniently and easily selected by the operation. It has been hereto-fore suggested, therefore, to provide a machine which is convertible between normal or "non-dustless" and "dustless"
operation by providing means for closing or blocking the exhaust outlet when "normal" or "non-dustless" operation is desired while enabling the operator to remove or defeat the exhaust closing or locking means and install a dust collector when "dustless" operation is desired. In such an arrangement, however, when the exhaust outlet is closed, some dust can still be collected and impacted within the fan chamber and exhaust outlet.
.
FIELD OF THE INVENTION
This invention relates to electrically driven portable surface cleaning machines such as a sander~ polisher, buffer, and the like having an oscillatable platen which creates dust during use and to a dust control method and system therefore.
BACKGROUND OF THE INVENTION
Electrically driven portable surface treating machines such as a sander, polisher, buffer, and the like having an oscillatable platen may create dust during use which in many machines is allowed to merely enter the ambient air in the work area. While this is satisfactory under some conditions, under other conditions it is desirable that the dust created be removed from the work area and not be allowed to enter the ambient air therearound. There has been a long standing need for improving the construction or arrangement of such machines so as to selectively provide for the collection of such dust when desired while enabling the machine to be easily and safely operated without dust collection when that mode of operation is satisfactory. A number of dust collec-tion bags and systems have been proposed and, for example, in U.S. Pa-tent No. 3,938,283, assigned to the assignee of the instant application, there is disclosed a dust collection system including a vacuum fan driven by the machine's elec-tric motor together with a shroud or skirt enclosing the oscillatable platen. The fan creates suction past the oscillatable platen and within the shroud or skirt to vacuum the dust away from the platen as it is created. An exhaust conduit is also provided supporting a dust collection filter bag and a support arm therefore. Such an arrangement, with the dust bag in place, may be referred to as a "dustless"
machine.
While effective to collect the dust which the machine creates, the additional bulk of the dust bag and support can, under certain conditions of operation, reduce the convenience of using the machine. Moreover, in some applications the dust collection capability is just not desired by the ma-chine operator. In addition, the basic machine, without the dust collection bag and support may be sold more econom-ically, giving the purchaser the option of later purchasing a dust collection bag as an accessory if "dustless" or "non-dustless" operation of the basic machine can be conveniently and easily selected by the operation. It has been hereto-fore suggested, therefore, to provide a machine which is convertible between normal or "non-dustless" and "dustless"
operation by providing means for closing or blocking the exhaust outlet when "normal" or "non-dustless" operation is desired while enabling the operator to remove or defeat the exhaust closing or locking means and install a dust collector when "dustless" operation is desired. In such an arrangement, however, when the exhaust outlet is closed, some dust can still be collected and impacted within the fan chamber and exhaust outlet.
.
2~5 It has also been previously suggested to utilize a sin-gle fan having separate sets~of vanes separated by a central flange wherein one set of blades provides for a flow of cool-ing air past the motor and the other set of blades provides dust collection. A mating flange portion of the machine housing, in planar alignment with the fan flange, separates the two fan halves to isolate the cooling half and the cool-ing air from the dust handling half. While this construc-tion provides an efficient, effective and inexpensive solu-tion to the provision of cooling air and dust collection,merely closing ox blocking the exhaust outlet or port for "non-dustless" or "normal" operation presents a signifi-cant danger that additional dust would be impacted wi-thin the compartment or drawn into the motor compartment.
OBJECTS OF THE INVENTION
Bearing in mind the foregoing, it is a primary object ` of the present invention to provide electrically driven portable surface treating machines such as a sander, polish-er, buffer, and the like having an oscillatable platen which creates dust during use with means is selectively operable for use in either a "dustless" or "non-dustless" configura-tion or mode of operation.
Another primary object of the present invention, in addition to the foregoing object, is the provision of such surface treating machines wherein impaction of dust does not occur when operated in a "non-dustless" configuration.
Yet another primary object of the present invention, in addition to each of the foregoing objects, is the provision in such machines of a two sided fan having a central flange and a set of vanes or blades on either side thereof, one set providing cooling air flow past the motor and the other set providing dust collection air flow.
Still another primary object of the present invention, in addition to each of the foregoing objects, is the provision in such machines of novel and improved methods and means for interrupting the flow of dust collecting air to the fan when it is desired to operate the machine in a "non-dustless"
configuration.
Another and still further primary object of the present invention, in addition to each of the foregoing objects, is the provision of such surface treating machines which may be sold as "non-dustless" and yet, with the addition of a dust collection bag, or the like, as an optional accessory be selectively converted by the operator to "dustless" operation.
Yet still another primary object of the present inven-tion, in addition to eàch of the foregoing objects, is the provision of a shutter arrangement between the dust collec-tion fan and the oscillatable platen which can be selectively opened or closed by an operator for operating the machine in a "dustless" or "non-dustless" configuration, respectively.
It is a feature of the present invention, that when the shutter is closed, dust ladden air is positively precluded from entering the machine mechanism.
The invention resides in the combination, construction, arrangement and disposition of the various component parts and elements incorporated in improved surface treating ma-chines and dust collection methods, apparatus and systems therefore in accordance with the principles of this inven-tion. This invention will be better understood and objects and important features other than those specifically enum erated above will become apparent when consideration is given to the following details and description which, when taken in conjunction with the annexed drawing describes, discloses, illustrates and shows a preferred embodimen-t or modification of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof. Other embodiments or modifications may be suggested to those having the benefit of the teachings herein, and such other embodiments or modifications are intended to be reserved, especially if they fall within the scope and spirit of the subjoined claims.
SU-~MARY OF THE INVE~TION
In accordance with the present invention, an electric-ally driven portable surface treating machine such as a sander, polisher, buffer, and the like, having an oscillat-able platen driven from a motor shaft and which creates dust during use, is provided with a dust collection fan on the motor shaft in a fan housing portion of the tool housing.
The fan housing portion is provided with an exhaust outlet or port which can selectively be fitted with dust collection means, such as a filter bag. The oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collec-tion fan housing portion. Between the shroud and the fan,there is provided a selective shutter arrangement which may be selectively opened and closed by the machine operator to enable the machine to be operated in either a "dustless"
or a "non-dustless" configuration or mode of operation. In the illustrated embodiment, the shutter arrangement comprises a pair of generally circular superposed plates each of which are provided with a plurality of alternatively radial sec-tor openings and ribs. One of the plates is non-rotatable relative the housing, as by being provided with a radial tang which extends into a mating complementary slot in the tool housing. The other plate is rota-table as by means of a radial tang extending through a slot in the tool housing for operator rotation to align the sector openings thereof selectively with the sector openings of the non-rotatable plate to enable air flow therethrough for dustcollection and dustless operation or with the ribs o~ the non-rotatable plate covering the sector openings of the rotatable plate and the ribs of the rotatable plate cover-ing the sector openings of the non-rotatable plate, isolating the fan and fan housiny portion from -the shroud or skir-t, blocking air flow therethrough and enabling "normal" or "non-dustless" operation of the machine.
DESCRIPTION OF THE DRAWING
-While the specification concludes with claims particular-ly pointing out and distinctly claiming the subject matter which is regarded as forming the present invention, it is believed the invention will be better understood from the following detailed description when taken in conjunction with the annexed drawing which discloses, illustrates and shows a preferred embodiment or modification of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof and wherein:
FIG. 1 is a side elevational view, partially broken away, of a surface treating machine constructed in accoxd-anee with the principles of the present invention, and FIG. 2 is an enlarged cross sectional plan view thereof taken substantially along line 2-2 of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
~ = . . .
With reference now to the drawing, there is shown and illustrated an electrically driven portable surface treating maehine, designated generally by the reference character 10.
The surface treating machine lO is depicted as a sander with a clamshell housing 12 of plastic or like material comprising a pair of complementary halves 14 and 16 which are detachably connected along a longitudinal split 18 by screws 20. Main handle portion 24 formed integral with the housing 12 is provided with an operator controlled electric on-off switch 26 between a motor 28 and a suitable source of electric pow-er. A forwardly positioned auxiliary handle 30 is also pro-vided so that the sander can be grasped and controlled by the operator.
The motor 28 drives a platen assembly 32 disposed with-in the housing 12 at the bottom thereof. An armature shaft 34 of the motor 28 has a pinion 36 formed on its lower end which connects through a gear reduction mechanism 38 to an eccentric bearing bracket 40 which imparts shiftable motion such as oscilatory, reciprocatory, orbital, or the like, to a rectangular rigid back plate 42 of the oscillatalbe platen 32.
A resilient pad 44 is bonded to the back plate 42 on which is typically mounted suitable sandpaper 46 to treat the surface of a work piece. Since the gear reduction mech-anism 38, the back plate 42, the resilient pad 44, and the manner in which they are operatively attached within the housing 16 form no part of the present invention, a further description thereof is deemed unnecessary herein.
Located generally medially of the housing 12, between the motor 28 and the gear reduction mechanism 38, is a cen-trifugal fan 48 mounted on and for rotation with the arma-ture shaft 34. The fan 48 has two sets of blades or vanes, a lower set 50 and an upper set 52, separa-ted by a circular flange 54. The housing 12, in radial alignment with the flange 54 is provided with an inwardly directed generally complementary flange portion 56 which defines in the hous-ing 12 two fan housing chambers, a lower chamber 58 associ-~
ated with the lower blades or vanes 50 and an upper chamber60 associated with the set of blades or vanes 52. Accord-ingly, fan 48 serves to provide simultaneous air flow through two separate channels or flow paths in the housing 12 separated by the complementary f].anges 54 and 56. In 3Q one channel or flow path, which may be referred to as the cooling air flow path, air is drawn by means of the upper set of fan vanes or blades 52 to be inducted through rec-tangular inlet openings 62 provided in the housing 12 gen-erally above the motor 28 for flow past the motor 28 and exhaust flow outwardly of the housing 12 through generally rectangular cooling air exhaust openings 64 communicating with the upper fan chamber 60. An inwardly extending ridge 66 integrally formed with the housing 12 extends generally parallel and spaced apar~ above the flange 56 and the fan 5 vanes 52 to further house the upper fan blades 52 and define an inlet opening 68 to aid in directing and controlling the cooling air flow.
Beneath the lower set of fan vanes or hlades 50, there is provided another inwardly direc-ted ridge 70 generally parallel and spaced beneath the flange 56 and the lower fan vanes or blades 50 to provide a dust collecting inlet open-ing 72. The dust collection inlet openings 72 communicates or is directes, as shown, with the generally open bottom of the housing 12 and a housing shroud or skirt 74 may be pro-vided generally encircling and enclosing the oscillatableplaten 32. Hence, as indicated by the arrows 76, air flow is inducted by the lower fan vanes 50 substantially entirely around the periphery of the oscillatable platen 32 to entrain and draw dust created by the oscillatable platen 32 and -the sandpaper 46, or the like, upwardly past the oscillatable platen 32, through the interior of the shroud 74 and -the open bottom of the housing 12 into the lower, dust collecting fan chamber 58 and outwardly of the housing 12 through a rec-tangular opening 78 in an exhaust nozzle or outlet 80 formed integrally with the housing 12 in general alingment and com-munication with the dust collecting fan chamber 58. ~ dust collection bag, or the like, having a complementary collar mating with the exhaust nozzle or outlet 80 may be affixed thereto for collecting the created dust.
The skirt 74 positioned around the lower end of the housing 12 may be attached thereto in any suitable manner.
In the embodiment shown, this skirt or shroud 74 is of rela-tively thin yieldable one-piece plastic material forming a loop, the upper end of which is slightly smaller than the outer periphery of the housing at the point of attachment.
To attach the skirt or shroud 74 to the housing 12, the skirt or shroud 74 is stretched slightly so that its inwardly directed top flange 82 engages a shoulder 84 provided there-fore on the housing 12. The skirt or shroud 74 is dimen-sioned such that its lower edge is slightly above the lowersurface of the pad 44 and sandpaper 46, and there is there-fore provided a free space 86 through which the dust collec-tion air may flow.
As heretofore pointed out, the surface treating machine 10 of the present invention is particularly construced and arranged to enable operation thereof in either a "dustless"
configuration or mode of operation wherein dust created by the sandpaper 46 is inducted through the opening 86 and exhausted through the exhaust opening 78 into a dust collect-ing filter bag, or the like, or the machine 10 is constructed and arranged to also be selectively operated in a "normal"
or "non-dustless" configuration or mode of operation wherein the dust created is merely left free to collect on the work surface being treated or to drift in the ambient air.
When being.operated in a "normal" or "non-dustless" man-ner, in accordance with the present invention, the dust col-lecting air flow which would otherwise be produced by the lower set of vanes or blades 50 is obstructed between the oscillatable platen 32 and the fan inlet opening 72. To achieve this, a shutter arrangement designa-ted by the refer-ence character 88 is provided which comprises a movable shut-ter disc 90 and a fixed shutter disc 92 superposed one above the other beneath the inwardly extending ridge 70 and within a generally annular chamber 93 surrounding the armature shaft 34 o~ the motor 28 and being supported by an inwardly directed flange 94 formed integrally with the housing halves 14 and 16.
The shutter discs 90 and 92 may be identical, of generally circular configuration and provided with a plurality of sector apertures 96 extending radially therearound having sector shaped radially extending ribs 98 therebetween of r slightly greater angular extent than the apertures 96 so that, upon suitable angular rotational movement of one disc relative the other, the sector openlngs 96 may be selectively aligned by the operator -to provide a through flow path for the dust collection air or misaligned with the ribs of each disc superposed and blocking the sec-tor apertures 96 of the other of the discs 90 and 92. Each of the discs 90 and 92 may be further provided with a generally radially extending tang 102, the tang 102 of the fixed disc 92 being disposed 10 in a mating slot 104 provided in the flange 94 of the hous-ing 12 and the tang 102 of the movable disc 90 extending into a laterally elonga~ed slot 106 in the housing 12 and movable therein for rotation of the disc 90. Further, enclosed within the slot 106, there may be positioned a 15 handle 108 which includes a groove 110 which straddles an upraised rim 111 of the slot 106 so that the handle 108 is slidable within the slot 106 but restrained against outward movement by engagement of the upraised rim 111 in the groove 110. The handle 108 is further provided with a groove 112 20 for receiving the tang 102 of the movable shutter disc 90 in a mating complementary manner. Hence, sliding movement of the handle 10~ will provide the requesite rotation of the movable shutter disc 90 to thereby effectuate selective obstructi.on or opening of the dirt collecting air flow from within the periphery of the skirt or shroud 74 to the dust collection fan vanes or blades 50 and outwardly through the exhaust outlet 78. When the shutter assembly 88 is closed, any flow of dust laden air from the region of the oscillat-able platen 32 towards the motor compartment is effectively and positively precluded. If desired, a secondary exhaust outlet may be provided on the skirt or shroud 74 which may be`selectively capped or equipped with a flexible hose, or the like, for collection of dust laden air by a canister or tank type vacuum cleaner.
Although the invention has been described in terms of a ~ 6~
preferred embodiment or modification, such technical equiva-lence to the means described~as well as their combination, and such other embodiments or modifica-tions as may be sug-gested to those having the benefit of the teachings herein are intended to be reserved should they be carried out accord-ing to the spirit of the invention.
OBJECTS OF THE INVENTION
Bearing in mind the foregoing, it is a primary object ` of the present invention to provide electrically driven portable surface treating machines such as a sander, polish-er, buffer, and the like having an oscillatable platen which creates dust during use with means is selectively operable for use in either a "dustless" or "non-dustless" configura-tion or mode of operation.
Another primary object of the present invention, in addition to the foregoing object, is the provision of such surface treating machines wherein impaction of dust does not occur when operated in a "non-dustless" configuration.
Yet another primary object of the present invention, in addition to each of the foregoing objects, is the provision in such machines of a two sided fan having a central flange and a set of vanes or blades on either side thereof, one set providing cooling air flow past the motor and the other set providing dust collection air flow.
Still another primary object of the present invention, in addition to each of the foregoing objects, is the provision in such machines of novel and improved methods and means for interrupting the flow of dust collecting air to the fan when it is desired to operate the machine in a "non-dustless"
configuration.
Another and still further primary object of the present invention, in addition to each of the foregoing objects, is the provision of such surface treating machines which may be sold as "non-dustless" and yet, with the addition of a dust collection bag, or the like, as an optional accessory be selectively converted by the operator to "dustless" operation.
Yet still another primary object of the present inven-tion, in addition to eàch of the foregoing objects, is the provision of a shutter arrangement between the dust collec-tion fan and the oscillatable platen which can be selectively opened or closed by an operator for operating the machine in a "dustless" or "non-dustless" configuration, respectively.
It is a feature of the present invention, that when the shutter is closed, dust ladden air is positively precluded from entering the machine mechanism.
The invention resides in the combination, construction, arrangement and disposition of the various component parts and elements incorporated in improved surface treating ma-chines and dust collection methods, apparatus and systems therefore in accordance with the principles of this inven-tion. This invention will be better understood and objects and important features other than those specifically enum erated above will become apparent when consideration is given to the following details and description which, when taken in conjunction with the annexed drawing describes, discloses, illustrates and shows a preferred embodimen-t or modification of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof. Other embodiments or modifications may be suggested to those having the benefit of the teachings herein, and such other embodiments or modifications are intended to be reserved, especially if they fall within the scope and spirit of the subjoined claims.
SU-~MARY OF THE INVE~TION
In accordance with the present invention, an electric-ally driven portable surface treating machine such as a sander, polisher, buffer, and the like, having an oscillat-able platen driven from a motor shaft and which creates dust during use, is provided with a dust collection fan on the motor shaft in a fan housing portion of the tool housing.
The fan housing portion is provided with an exhaust outlet or port which can selectively be fitted with dust collection means, such as a filter bag. The oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collec-tion fan housing portion. Between the shroud and the fan,there is provided a selective shutter arrangement which may be selectively opened and closed by the machine operator to enable the machine to be operated in either a "dustless"
or a "non-dustless" configuration or mode of operation. In the illustrated embodiment, the shutter arrangement comprises a pair of generally circular superposed plates each of which are provided with a plurality of alternatively radial sec-tor openings and ribs. One of the plates is non-rotatable relative the housing, as by being provided with a radial tang which extends into a mating complementary slot in the tool housing. The other plate is rota-table as by means of a radial tang extending through a slot in the tool housing for operator rotation to align the sector openings thereof selectively with the sector openings of the non-rotatable plate to enable air flow therethrough for dustcollection and dustless operation or with the ribs o~ the non-rotatable plate covering the sector openings of the rotatable plate and the ribs of the rotatable plate cover-ing the sector openings of the non-rotatable plate, isolating the fan and fan housiny portion from -the shroud or skir-t, blocking air flow therethrough and enabling "normal" or "non-dustless" operation of the machine.
DESCRIPTION OF THE DRAWING
-While the specification concludes with claims particular-ly pointing out and distinctly claiming the subject matter which is regarded as forming the present invention, it is believed the invention will be better understood from the following detailed description when taken in conjunction with the annexed drawing which discloses, illustrates and shows a preferred embodiment or modification of the present invention and what is presently considered and believed to be the best mode of practicing the principles thereof and wherein:
FIG. 1 is a side elevational view, partially broken away, of a surface treating machine constructed in accoxd-anee with the principles of the present invention, and FIG. 2 is an enlarged cross sectional plan view thereof taken substantially along line 2-2 of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
~ = . . .
With reference now to the drawing, there is shown and illustrated an electrically driven portable surface treating maehine, designated generally by the reference character 10.
The surface treating machine lO is depicted as a sander with a clamshell housing 12 of plastic or like material comprising a pair of complementary halves 14 and 16 which are detachably connected along a longitudinal split 18 by screws 20. Main handle portion 24 formed integral with the housing 12 is provided with an operator controlled electric on-off switch 26 between a motor 28 and a suitable source of electric pow-er. A forwardly positioned auxiliary handle 30 is also pro-vided so that the sander can be grasped and controlled by the operator.
The motor 28 drives a platen assembly 32 disposed with-in the housing 12 at the bottom thereof. An armature shaft 34 of the motor 28 has a pinion 36 formed on its lower end which connects through a gear reduction mechanism 38 to an eccentric bearing bracket 40 which imparts shiftable motion such as oscilatory, reciprocatory, orbital, or the like, to a rectangular rigid back plate 42 of the oscillatalbe platen 32.
A resilient pad 44 is bonded to the back plate 42 on which is typically mounted suitable sandpaper 46 to treat the surface of a work piece. Since the gear reduction mech-anism 38, the back plate 42, the resilient pad 44, and the manner in which they are operatively attached within the housing 16 form no part of the present invention, a further description thereof is deemed unnecessary herein.
Located generally medially of the housing 12, between the motor 28 and the gear reduction mechanism 38, is a cen-trifugal fan 48 mounted on and for rotation with the arma-ture shaft 34. The fan 48 has two sets of blades or vanes, a lower set 50 and an upper set 52, separa-ted by a circular flange 54. The housing 12, in radial alignment with the flange 54 is provided with an inwardly directed generally complementary flange portion 56 which defines in the hous-ing 12 two fan housing chambers, a lower chamber 58 associ-~
ated with the lower blades or vanes 50 and an upper chamber60 associated with the set of blades or vanes 52. Accord-ingly, fan 48 serves to provide simultaneous air flow through two separate channels or flow paths in the housing 12 separated by the complementary f].anges 54 and 56. In 3Q one channel or flow path, which may be referred to as the cooling air flow path, air is drawn by means of the upper set of fan vanes or blades 52 to be inducted through rec-tangular inlet openings 62 provided in the housing 12 gen-erally above the motor 28 for flow past the motor 28 and exhaust flow outwardly of the housing 12 through generally rectangular cooling air exhaust openings 64 communicating with the upper fan chamber 60. An inwardly extending ridge 66 integrally formed with the housing 12 extends generally parallel and spaced apar~ above the flange 56 and the fan 5 vanes 52 to further house the upper fan blades 52 and define an inlet opening 68 to aid in directing and controlling the cooling air flow.
Beneath the lower set of fan vanes or hlades 50, there is provided another inwardly direc-ted ridge 70 generally parallel and spaced beneath the flange 56 and the lower fan vanes or blades 50 to provide a dust collecting inlet open-ing 72. The dust collection inlet openings 72 communicates or is directes, as shown, with the generally open bottom of the housing 12 and a housing shroud or skirt 74 may be pro-vided generally encircling and enclosing the oscillatableplaten 32. Hence, as indicated by the arrows 76, air flow is inducted by the lower fan vanes 50 substantially entirely around the periphery of the oscillatable platen 32 to entrain and draw dust created by the oscillatable platen 32 and -the sandpaper 46, or the like, upwardly past the oscillatable platen 32, through the interior of the shroud 74 and -the open bottom of the housing 12 into the lower, dust collecting fan chamber 58 and outwardly of the housing 12 through a rec-tangular opening 78 in an exhaust nozzle or outlet 80 formed integrally with the housing 12 in general alingment and com-munication with the dust collecting fan chamber 58. ~ dust collection bag, or the like, having a complementary collar mating with the exhaust nozzle or outlet 80 may be affixed thereto for collecting the created dust.
The skirt 74 positioned around the lower end of the housing 12 may be attached thereto in any suitable manner.
In the embodiment shown, this skirt or shroud 74 is of rela-tively thin yieldable one-piece plastic material forming a loop, the upper end of which is slightly smaller than the outer periphery of the housing at the point of attachment.
To attach the skirt or shroud 74 to the housing 12, the skirt or shroud 74 is stretched slightly so that its inwardly directed top flange 82 engages a shoulder 84 provided there-fore on the housing 12. The skirt or shroud 74 is dimen-sioned such that its lower edge is slightly above the lowersurface of the pad 44 and sandpaper 46, and there is there-fore provided a free space 86 through which the dust collec-tion air may flow.
As heretofore pointed out, the surface treating machine 10 of the present invention is particularly construced and arranged to enable operation thereof in either a "dustless"
configuration or mode of operation wherein dust created by the sandpaper 46 is inducted through the opening 86 and exhausted through the exhaust opening 78 into a dust collect-ing filter bag, or the like, or the machine 10 is constructed and arranged to also be selectively operated in a "normal"
or "non-dustless" configuration or mode of operation wherein the dust created is merely left free to collect on the work surface being treated or to drift in the ambient air.
When being.operated in a "normal" or "non-dustless" man-ner, in accordance with the present invention, the dust col-lecting air flow which would otherwise be produced by the lower set of vanes or blades 50 is obstructed between the oscillatable platen 32 and the fan inlet opening 72. To achieve this, a shutter arrangement designa-ted by the refer-ence character 88 is provided which comprises a movable shut-ter disc 90 and a fixed shutter disc 92 superposed one above the other beneath the inwardly extending ridge 70 and within a generally annular chamber 93 surrounding the armature shaft 34 o~ the motor 28 and being supported by an inwardly directed flange 94 formed integrally with the housing halves 14 and 16.
The shutter discs 90 and 92 may be identical, of generally circular configuration and provided with a plurality of sector apertures 96 extending radially therearound having sector shaped radially extending ribs 98 therebetween of r slightly greater angular extent than the apertures 96 so that, upon suitable angular rotational movement of one disc relative the other, the sector openlngs 96 may be selectively aligned by the operator -to provide a through flow path for the dust collection air or misaligned with the ribs of each disc superposed and blocking the sec-tor apertures 96 of the other of the discs 90 and 92. Each of the discs 90 and 92 may be further provided with a generally radially extending tang 102, the tang 102 of the fixed disc 92 being disposed 10 in a mating slot 104 provided in the flange 94 of the hous-ing 12 and the tang 102 of the movable disc 90 extending into a laterally elonga~ed slot 106 in the housing 12 and movable therein for rotation of the disc 90. Further, enclosed within the slot 106, there may be positioned a 15 handle 108 which includes a groove 110 which straddles an upraised rim 111 of the slot 106 so that the handle 108 is slidable within the slot 106 but restrained against outward movement by engagement of the upraised rim 111 in the groove 110. The handle 108 is further provided with a groove 112 20 for receiving the tang 102 of the movable shutter disc 90 in a mating complementary manner. Hence, sliding movement of the handle 10~ will provide the requesite rotation of the movable shutter disc 90 to thereby effectuate selective obstructi.on or opening of the dirt collecting air flow from within the periphery of the skirt or shroud 74 to the dust collection fan vanes or blades 50 and outwardly through the exhaust outlet 78. When the shutter assembly 88 is closed, any flow of dust laden air from the region of the oscillat-able platen 32 towards the motor compartment is effectively and positively precluded. If desired, a secondary exhaust outlet may be provided on the skirt or shroud 74 which may be`selectively capped or equipped with a flexible hose, or the like, for collection of dust laden air by a canister or tank type vacuum cleaner.
Although the invention has been described in terms of a ~ 6~
preferred embodiment or modification, such technical equiva-lence to the means described~as well as their combination, and such other embodiments or modifica-tions as may be sug-gested to those having the benefit of the teachings herein are intended to be reserved should they be carried out accord-ing to the spirit of the invention.
Claims (5)
1. In an electrically driven portable surface treat-ing machine such as a sander, polisher, buffer, and the like, having an oscillatable platen driven from a motor shaft and which creates dust during use, a dust collection fan on the motor shaft in a fan housing portion of the tool housing, and an exhaust outlet or port which can selectively be fit-ted with dust collection means, such as a filter bag the improvement comprising a selective shutter arrangement between said platen and said fan which may be selectively opened and closed by the machine operator to enable the machine to be selectively operated in either a "dustless"
or a "non-dustless" mode of operation.
or a "non-dustless" mode of operation.
2. Surface treating machine defined in Claim 1 wherein said shutter arrangement comprises a pair of gen-erally circular superposed plates each of which are pro-vided with a plurality of alternating radial sector open-ings and ribs, one of said plates being non-rotatable relative the housing, and the other of said plates being rotatable by the operator to selectively align the sector openings thereof selectively with the sector openings of the non-rotatable plate to enable air flow therethrough for dust collection and "dustless" operation or with said ribs of the non-rotatable plate covering the sector open-ings of said rotatable plate and the ribs of said rotatable plate covering the sector openings of said non-rotatable plate, blocking air flow therethrough and enabling "normal"
or "non-dustless" operation of the machine.
or "non-dustless" operation of the machine.
3. Surface treating machine defined in Claim 2 wherein the oscillatable platen is enclosed within a shroud or skirt and the interior of the shroud or skirt is ducted to the inlet of the dust collection fan housing portion.
4. Surface treating machine defined in Claim 2 wherein said non-rotatable plate comprises a radial tang which extends into a mating complementary slot in the tool housing.
5. Surface treating machine defined in Claim 4 wherein said rotatable plate comprises a radial tang extend-ing through a slot in the tool housing for operator rotation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/284,844 US4381628A (en) | 1981-07-20 | 1981-07-20 | Dust control system for surface treating machine |
| US284,844 | 1981-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1164215A true CA1164215A (en) | 1984-03-27 |
Family
ID=23091744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000400273A Expired CA1164215A (en) | 1981-07-20 | 1982-03-31 | Dust control method and system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4381628A (en) |
| CA (1) | CA1164215A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL8303577A (en) * | 1983-10-17 | 1985-05-17 | Skil Nederland Nv | FLAT SANDER. |
| US4598500A (en) * | 1985-07-31 | 1986-07-08 | Faraudo Julio P | Dust collector for air sander |
| US5125190A (en) * | 1990-05-16 | 1992-06-30 | Buser John P | Dust collector and shield for rotary grinder |
| US5419737A (en) * | 1993-10-28 | 1995-05-30 | Ryobi Motor Products Corp. | Random orbital sanding machine having a removable debris container |
| US5580302A (en) * | 1994-02-28 | 1996-12-03 | Black & Decker Inc. | Random orbit sander having air directing baffle |
| US5707273A (en) * | 1994-04-28 | 1998-01-13 | Timesavers, Inc. | Multiple-pad orbital sander with split pad platen |
| US5678272A (en) * | 1995-10-20 | 1997-10-21 | Waxing Corporation Of America, Inc. | Power tool having a quick release system for attaching a working element |
| US6290587B1 (en) | 1995-10-20 | 2001-09-18 | Wilton Tool Company, Llc | Electrically-powered polisher |
| US5595532A (en) * | 1995-10-20 | 1997-01-21 | Waxing Corporation Of America, Inc. | Electrically-powered polisher |
| US5642008A (en) * | 1995-10-20 | 1997-06-24 | Waxing Corporation Of America, Inc. | Power tool motor assembly |
| US5974626A (en) * | 1997-03-26 | 1999-11-02 | Nilfisk-Advance, Inc. | Collection system for a floor polishing machine |
| JP3499731B2 (en) * | 1997-10-16 | 2004-02-23 | 株式会社マキタ | Dust collection structure for power tools |
| JP2000325673A (en) * | 1999-05-18 | 2000-11-28 | Tomy Co Ltd | Cleaning rolling stock model |
| US7509900B2 (en) * | 2001-02-20 | 2009-03-31 | Young Ronald E | Scroll saw with dust collector |
| DE10245692A1 (en) * | 2002-09-30 | 2004-04-08 | Robert Bosch Gmbh | Hand grinder with dust extraction |
| US6921320B1 (en) | 2002-12-19 | 2005-07-26 | Chad J. Nielson | System and methods for reducing dust emissions |
| AU2003291857B2 (en) * | 2002-12-23 | 2010-02-18 | Advance Posture Systems Pty Ltd | Dust Shroud |
| WO2004056536A1 (en) * | 2002-12-23 | 2004-07-08 | Advance Posture Systems Pty Ltd | Hand tool support |
| US20040212205A1 (en) * | 2003-01-30 | 2004-10-28 | Linker Frank V. | Method and apparatus for handling semiconductor wafers and interleafs |
| US7338348B2 (en) * | 2003-08-29 | 2008-03-04 | Black & Decker Inc. | Dust collection system for a belt sander |
| US7112127B2 (en) * | 2003-12-03 | 2006-09-26 | Watson Adam Dewain | Joint compound sander |
| US7081046B2 (en) * | 2003-12-03 | 2006-07-25 | Watson Adam Dewain | Sanding machine supporting removable side extensions |
| US20050221737A1 (en) * | 2004-04-06 | 2005-10-06 | Cooper Vincent P | Orbital sander with vertical handle |
| US20050221738A1 (en) * | 2004-04-06 | 2005-10-06 | Cooper Vincent P | Orbital sander with vertical handle |
| US7056198B2 (en) * | 2004-06-14 | 2006-06-06 | Harris Research, Inc. | Dust containment device for surfacing machines |
| CN1958235B (en) * | 2005-10-31 | 2010-07-14 | 苏州宝时得电动工具有限公司 | Sanding machine |
| ITMI20060815A1 (en) * | 2006-04-24 | 2007-10-25 | Guido Valentini | DUST COLLECTION CONTAINER WITH PALLET ELEMENT FOR MOTORIZED TOOL WITH SUCTION CAPACITY |
| US7805805B2 (en) * | 2006-11-13 | 2010-10-05 | Loveless Ash Company, Inc. | Vacuum assisted scraper |
| US20090181606A1 (en) * | 2008-01-15 | 2009-07-16 | Michael Loveless | Vacuum shroud for use with drilling tools |
| US8137165B2 (en) * | 2008-01-15 | 2012-03-20 | Dust Collection Products, Llc | Dust shroud with adjustable mounting mechanism |
| US8177606B2 (en) * | 2008-01-15 | 2012-05-15 | Dustless Depot, Llc | Dust shroud for rotary tools |
| US8133094B2 (en) * | 2008-01-21 | 2012-03-13 | Dust Collection Products, Llc | Dust shroud with access hatch retention mechanism |
| US20090183377A1 (en) * | 2008-01-21 | 2009-07-23 | Michael Loveless | Dust shroud for circular saws |
| US8011398B2 (en) * | 2008-01-22 | 2011-09-06 | Dustless Depot, Llc | Dust shroud for gas powered circular saws |
| US8702478B2 (en) * | 2009-05-08 | 2014-04-22 | Michael Loveless | Angle grinder dust shroud with unitary adjustable mounting collar |
| US8381711B2 (en) | 2009-06-16 | 2013-02-26 | Dustless Depot, Llc | Universal dust collection shroud for high speed gas powered saws |
| US8523637B2 (en) * | 2009-07-21 | 2013-09-03 | Dustless Depot, Llc | Angle grinder dust shroud with slideable access hatch |
| US8561512B2 (en) * | 2009-08-18 | 2013-10-22 | Dustless Depot Llc | Cutoff saw and stand with integrated dust filtration system |
| WO2011119229A1 (en) * | 2010-03-24 | 2011-09-29 | C.W. Machine Worx, Ltd. | Dust suppression apparatus |
| CN102233533B (en) * | 2010-04-21 | 2013-03-06 | 苏州宝时得电动工具有限公司 | Sander |
| CN102233532A (en) * | 2010-04-21 | 2011-11-09 | 苏州宝时得电动工具有限公司 | Sander |
| CN103331662B (en) * | 2010-04-21 | 2016-08-03 | 苏州宝时得电动工具有限公司 | Skin grinder |
| US9038275B2 (en) | 2011-09-07 | 2015-05-26 | Dustless Depot, Llc | Reciprocating saw dust shroud |
| US9393658B2 (en) | 2012-06-14 | 2016-07-19 | Black & Decker Inc. | Portable power tool |
| CN103056778A (en) * | 2012-12-31 | 2013-04-24 | 储建明 | Dust collector of long-bar wall grinder |
| CN103962905A (en) * | 2013-02-01 | 2014-08-06 | 江苏金立电子机械科技有限公司 | Novel wall polishing machine |
| DE102013202673A1 (en) * | 2013-02-19 | 2014-08-21 | Robert Bosch Gmbh | Hand machine tool device |
| CN104526488A (en) * | 2015-01-06 | 2015-04-22 | 江苏中茂工艺品制造有限公司 | Polishing disc device of wall polisher |
| US10293421B2 (en) | 2016-09-15 | 2019-05-21 | Dustless Depot, Llc | Circular saw dust collection shroud |
| USD816453S1 (en) | 2016-09-15 | 2018-05-01 | Dustless Depot, Llc | Circular saw dust shroud |
| US11123839B2 (en) | 2018-10-23 | 2021-09-21 | Dustless Depot Llc | Grinder dust shroud with input shaft gasket and adjustable mounting mechanism |
| USD908149S1 (en) | 2018-10-23 | 2021-01-19 | Dustless Depot Llc | Angle grinder dust shroud with variable position slots for mounting brackets |
| US11273505B2 (en) | 2019-03-27 | 2022-03-15 | Dustless Depot, Llc | Circular saw dust collection shroud |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3938283A (en) * | 1975-02-24 | 1976-02-17 | The Singer Company | Dust bag support |
-
1981
- 1981-07-20 US US06/284,844 patent/US4381628A/en not_active Expired - Fee Related
-
1982
- 1982-03-31 CA CA000400273A patent/CA1164215A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4381628A (en) | 1983-05-03 |
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