US2083483A - Separable scissor construction - Google Patents

Description

June 8, 1937. B. STREZOFF 2,033,483

' SEPARABLE SCISSOR CONSTRUCTION Filed Feb. 17, 1956 Patented June 8, 1937 UNITED STATES PATENT OFFICE f Bogoia Strezoff, Minneapolis, Minn.

Application February 17, 1936, Serial No.-64,247

3 Claims.

My invention relates to scissor construction and particularly to scissors having one blade readily separable from the other.

Various types of scissors are in use, some having both blades of the ordinary straight-edged type trades and professions an individual may have use for a number of different types of scissors each of which includes one blade of the ordinary straight-edged type.

In such cases it would be highly desirable to have scissors in which one blade iseasily and quickly separable fromthe other so that one straight-edged blade may be operatively connected either to a second straightedged blade or to any one of a plurality of special blades.

An object of my invention is to provide pivot joint construction for scissors and the like permitting quick and easy detachment of one blade of the scissors from the other to enable operative association of a first blade with any one of several second blades. I

Another objectis to provide scissors 'with separable pivot joint construction which is snugly fitting and yet free for easy pivoting when assembled in operative position. P

A further object is to provide such pivot joint structure of simple, rugged and inexpensive construction.

These and otherobjects and advantages of the invention .will more fully appear from the following description, made in connection with the accompanying drawing,"wherein like reference characters refer to the same or similar parts throughout the various views, and in which:-

Fig. 1 is a view of a pair of scissors embodying my invention, the blades being shown in closed position in full lines and one blade being shown in dotted lines as it appears when swung relative to the other blade to a wide open position;

Fig. 2 is a view of another type ofblade which may be substituted for one of the blades of Fig. 1.

sist, in general, of a pair of scissor members i and 6 comprising respective medial portions 5a and 6a, respective handles 5b and 6b and respective shearing blades 5c and 6c; the handle and blade of each scissor member extending in opposite directions from the medial portion thereof and the medial portions of the respective scissor members being connected together in crossed pivotal relation. All of the above described structure is in accordance withv the conventional practice except the pivotal joint which I employ and'which will be described. l

The inner side of the medial portion 6a of the scissor member 6 carries a pivot stud I of noncircular cross sectionin inwardly projecting normal relation thereto. While other means could be used, the stud I is secured to the medial portion 6a of the scissor member 6 by means of a screw-threaded extension la thereof screwthreadedly retained in an internally screwthreaded apertured portion of the medial portion Go as shown. The head lb of the stud I is preferably of circular shape and may be slotted; as shown if desired, to facilitate making of'the above described screw-threaded connection. A jam-nut 1c is placed on the free end of the stud I as shown.

The stud 1 is of non-circular cross section as above mentioned, and, while various non-circular shapes could be used, I prefer to use a shape such as would be produced by taking. a cylindrical stud and removing material to form a pair of diametrically oppositely located parallel flat faces such as the faces 1d. The stud 1 is secured to the medial portion 6a of the scissor member 6 with a line disposed diametrically thereof and parallel to the faces Id displaced by an acute angle from -the longitudinal axis of the-scissor member 6 member 5 is provided with a centrally located circular aperture 8 therethrough for receiving the stud I in journaled relation thereto. The-aperture 8 has a diame'ter'exceeding the longest diameter of the stud 'l only-sumciently to'permit the stud 'l to rotate in the aperture 8. Although the head 1b of the pivot stud I may be disposed so as to hear at its inner sideagainst the outer side'of the medial portion 5a of the scissor memher 5,. it is preferable that'the outer end of the aperture I be increasedin diameter to form a circular recess or depression I for receiving the head ID at least to a portion of the depth of the head Ib as shown. The diameter of the recess t is such that the periphery of the head I!) and removal therefrom of the stud I and its head Ib. To this end a notch or slot II is formed in the medial portion Ia of the scissor member I extending from an edge of the member I to the aperture 8 in radial relation to the aperture I. Preferably, the slot It extends substantially laterally of the scissor member I toward the right as viewed in the full line portion of Fig. 1. The width of the slot III is necessarily dimensionally intermediate the longest and shortest diameters of the pivot stud I and is preferably greater than the smallest diameter of the stud I only to an extent providing clearance permitting movement of the stud I through the slot In laterally of the scissor member I when the faces Id of the stud I are parallel to the sides of the slot II. A groove II, for accommodating the head Ib of the pivot stud I, extends from the recess 9 to the edge of the medial portion In of the scissor member'I in co-directional relation to the slot in. The width of the groove II is at least as great as the diameter of the stud head 'Ib and is preferably equal to the diameter of the head receiving recess 9.

A hair thinning scissor member I2 adapted for association with the scissor member I'in substitution for the scissor member 5 is shown in Fig. 2. .The scissor member I2 is identical with the scissor member 5 in its medial portion I 2a and the handle portion I21) and is provided with an aperture 8, recess 9, slot I0 and groove II identical with those described above in connection with the scissor member I. The blade He is identical with the blade of the scissor member I except that the cutting edge thereof is.notched and I formed in accordance with the construction ordinarily found in hair thinning scissors of conventional design. Other similar scissor members having various types of cutting edges may be provided for association with the scissor member 6 if desired. I

In normal use of my scissors the same are manipulated in the same manner as any scissors of conventional design. Within the range of angles at which the respective scissor members I and I are disposed rel'ative to each other in such use the stud I is always so disposed that the faces Id are never parallel to the slot I I and hence that the projected width of the stud I presented to the inner end of the slot I0 is always greater than the width of the slot III to prevent outward movement of the stud I through or into the slot II. In this manner the scissor members 5 and I are positively retained in pivotal relation to each other in normal use ofthe scissors. The journaled engagement of the circular head 1b of the pivot stud I with material defining the sides of the circular recess 9 assists'in preventing lateral play.

of the pivotal joint and'its engagement with the material defining the bottom of the recess prevents separation of the scissor members I and 6 in the direction of the longitudinal axis of the stud I.

When it is desired to separate the respective scissor members I and t the same are apart to approximately their wide open position as represented .in Pig. 1 by member in full lines and member I in dotted lines. This is a position angularly displaced in the vicinity of 225 degrees from the fully closed position of the members I and I. In the approximately wide open position described the faces Id of the stud I are parallel to and aligned with the sides of the slot ll so that the stud I may be slidthrough the slot It to disengage one of themembers I and I from the other. The method of ire-assembly is believed to beapparent and it should also be apparent that the member I! of. Fig. 2, or any other scissor member having similar construction in its medial portion. maybe substituted for the scissor member I in such re-assembly.

Another form of my separable pivot joint is illustrated in Fig. 5. In this form the non-circular pivot stud III is formed integrally with the medial portion Ia of the scissor member I.- The 'pivot stud III and the medial portion Ia. are apertured co-axially of the pivot stud II, the lower portion of the material defining the aperture being internally screw-threaded and the upper portion being of slightly increased diameter. The pivot stud It is of the same cross-sectional shape and dimensions as the previously described pivot stud I and has flat faces ltd. disposed at the-same angle as the faces Id of the pivot stud I. A screw I I, having a head Ila. of the same construction as the head lb of the stud I, is screw threadedly engagedin the above mentioned aperture with its head liq disposed in the circular recess 9 of the scissormember I, A jam nut I lbv is placed on the free end of the screw II. The pivot stud II is, of course, normally journaled in the aperture 8 of the scissor member 5 and disengagement of the pivot stud ill from the scissor member I is accomplished in the same manner as employed in disengaging the pivot stud I of the previously described embodiment of the invention. Ad-' justment of the scissors to compensate for wear I is effected by suitably turning the screw II.

With construction such as described above, it is obvious that scissors of various types and for various purposes may be readily available with much fewer parts than if a separate pair of nonseparable scissors were provided for each purpose.

If any scissor member of a set of scissor members such as mine becomes broken or damaged, it is'not necessary to replace a complete pair of scissors since a new member may be readily assembled with an old member of complementary construction. Also separation of the respective members of a pair of scissors such as mine greatly facilitates easy and accurate sharpening of the cutting edges thereof and where necessary. the cleansing and sterilizing thereof.

While my separable pivotal joint has been 11- lustrated and described as applied to scissors, it

of construction permitting convenient and rapid changes may be made in the form, details, proportions and arrangement of the parts, without departing from the scope of my invention, which, generally stated, consists in a device capable ofcarrying out the objects above set forth and in the novel parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is;- l. A separable pair of scissors having in combination a pair of crossed, pivotally connected scissor elements having blade portions adapted to frictionally engage at their edges for shearing effect and a separable pivot joint connecting the medial portions of said elements and including a headed pivot stud projecting from the inner side of one of said elements and threaded into said element for adjustable clamping action against said other scissor element, said stud having a non-circular portion adjacent its outer end having arcuate bearing surfaces concentric of its axis and having portions of less radius between said bearing surfaces, said second scissor element being apertured to receive the cross sectional shape of.said non-circular stud portion only when said scissor elements are disposed at an angle to each other outside the normal operating range thereof and having a substantially circular bearing surface concentric with the axis of said stud .for engaging the arcuate bearing areas of said stud after said scissor elements are joined and secured together. I

2. A separable pair of scissors having in combination a pair of crossed, pivotally connected scissor elements having blade portions adapted to frictionally engage attheir edges for shearing efiect and a separable pivot joint connecting the medial portions of said elements and including a a headed pivot stud projecting from the inner side of one of said elements and threaded through said element for adjustable clamping action against said other scissor element, said stud having a non-circular portion adjacent its outer end having arcuate bearing surfaces concentric of its axis and having portions of less radius between said bearing surfaces, said second scissor element being apertured to receive the cross sectional shape of said non-circular stud portion only when said scissor elements are disposed at an angle to each other outside the normal operating range thereof and having a substantially circular bearing surface concentric with the axis of said stud for engaging the arcuate bearing areas of said stud after said scissor elements are joined and secured together, and a jam nut threadedlyengaging the projecting end of said pivot stud and engaging against said first mentioned scissors element to retain said stud against screw displacement.

3. A separable pair of scissors having in combination a pair of crossed, pivotally connected scissor elements having blade portions adapted to frictionally engage at their edges for shearing effect and a separable pivot joint connect ing the medial portions of said elements and including a headed pivot stud projecting from the inner side of one of said elements and threaded into said element for adjustable clamping action tween said arcuate bearing surfaces whereby said stud may be passed through said slot. only when the maximum diameter of said stud is-substantially parallel to said slot and means for retaining said stud against screw displacement relative to said first mentioned scissors element.

BOGOIA STREZOFF.

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