US502809A

US502809A - Shears

Info

Publication number: US502809A
Authority: US
Publication date: 1893-08-08
Anticipated expiration: 1910-08-08

Description

(No Model.)

r P. G. CASPI'AN.

UNITED STATES.

PATENT OFFICE.

PASCHAL GREGORYSCASPIAN, OF BROOKLYN, NEV YORK.

SHEA-RS.

SPECIFICATION forming part Of Letters Patent N0. 502,809, dated August 8, 1893.

l Application filed February 28, 1893. Serial No. 464,080. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, PAscHAL GREGORY OAS- PIAN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Shears, of which the following is a specification.

My invention relates to improvements in shears; and the obj ects in view are to produce a pair of shears so constructed as to facilitate operating the same through cloth or other material, that is to say, adapting them to be operated with greater ease; to so construct them as to provide for a ready adjustment of the blades against each other, whereby they are self-sharpening; to avoid in producing such adjustment a binding of the pivots of the shears, whereby they are not materially obstructed in their pivotal movements; and to so construct the shears that the cutting or movable blade will operate upon the material in a knife-like manner, that is to say, with a draw-cut instead of a shear-cut as has heretofore been the case, whereby the work is drawn into the cutting-point of the shears instead of being forced away from such point by the coming together of the shears.

' Other objects and advantages of the invention will appear in the following description and the novel features thereof will be particu- -larly pointed out in the claim.

Referring to the drawingsz-Figures l and 2 are reverse elevations of the shears embodying my invention. Fig. 3 is a detail in perspective of the stationary member. Fig. 4 is a similar view of the blade of the movable member. Fig. 5 is a detail in perspective of the force-arm or lever of the movable member.

4Like numerals of reference indicate like parts in all the figures of the drawings.

The shears, as is usual, consist of two members, in this instance one member, the lower one, being designated as 1 and the upper or movable member being designated as 2. -The lower member 1 consists of a central bodyportion, whose rear extremity is shaped .to form a thumb-loop 3, as is usual, and whose front portion is shaped to form a reduced shear-blade 4. The inner face of the bodyportion 1 is recessed as indicated at 5, and said body-portion back of said recess is provided with front and rear lugs .6 and 7, respectively, the latter being slightly above the former. The movable member comprises a movable shear-blade 8 which is located upon the rear or outer side of the lugs 6 and 7 and is recessed near its butt-end and upon its innerface as at 9, to receive the lugs 6 and 7,

-thus forming an intermediate inwardly-projecting face 10, which takes between the lugs 6 and 7 and is of about half the thickness thereof. The inner extremity of the blade 8 is provided with a curved slot 11, and through this slot extends a headed-pin orscrew12 carrying a loose roller (Fig. 4) whose inner end takes into the rear lug 7 of the body-portion of the lower member.

13 designates the force or lever-arm of the shears, which like the lower member has itsA rear extremity shaped to form a thumb-loop 14. This force or lever-arm has its rear face recessed as at 15, in a similar manner as the blade 8 is recessed and for a similar purpose, namely, to receive thelugs 6 and 7 Yof the member 1. By the production of the recesses 15 a central inwardly-projecting face 16 is formed, the same being secured to and corresponding with the face 10 of the movable blade, and these two inwardly-projecting faces which meet and work upon each other between the lugs 6 and 7 are pivotallyconnected by means of a pivot-screw 17. The front extremity of the force or lever-army 13 is'by means of a pivot-screw 18 connected with the front lug 6 of the lower orstationary member. A countersunk screw-threaded opening 19, is formed in the inner face of the rear lug 7 and in the 'same a set-screw 20 is seated and mounted for adjustment, the outer end of said set-screw being designed to impinge against the inner face of the inner end of the shear-bladeS and thus force said inner end an imperceptible degree from the lug 7 and hence its outer end in shearing contact with the cutting-edge of the lower blade 4, whereby the two blades are maintained in operative position to each other and are in a measure self-sharpening.

In operation the blade 4 remains stationary and is slid under the material to be cut and the force or lever-arm 13 is' swung upon its pivot 18 by the thumb lof the operator. The

swinging of this lever or force-arm causes a IOO corresponding operation or movement upon the part of the blade 8 which, as will be seen, not only swings upon the headed-stud 12 but also reciprocates by reason of the fact that the blade 8 is eccentrically pjvoted to the lever or force-arm with relation t the point of pivot 18 between said lever or force-arm and the lower member. A The result is that as before stated the lower blade remains stationary while the upper blade in addition to its vibratory motion has a rearward reeiprocation, that is to say, as the blade S closes it likewise moves to the rear so that the front end of its slot 11 is adjacent to the stud 12 and when opened the rear end of its slot 11 is adjacent to the stud 12. It reciprocates to the rear as closed and to the front as opened thus drawing the material in between the shear-blades and facilitating the cutting.

From the foregoing description in connection with the accompanying drawings it will be seen that I have provided shears whose blades may be forced through the material with greater facility than those heretofore constructed; that I have provided a means for adjusting the blades toward each other whereby they are in a manner self-sharpening, and that I avoid in such means the binding of the members at their pivot-points and hence do not impede to any material extent the operation ot' the shears; and furthermore, that the blades operate in a knife-like manner upon the material, that is so as to form a draw-cut in addition to the shear-cut, thus enabling the operator to cut through thicker or tougher material with less exertion than heretofore.

Having described my invention, what I claim is- The combination with the lower member consisting of the rear loop 3, the front blade 4, the intermediate body-portion recessed at in its outer face and upon its rear face having the front and rear lugs 6 and 7 respectively, of the movable member consisting of the blade 8 recessed as at 9 to receive the lugs 6 and 7 and provided intermediate said lugs with the projecting face 10, said blade being provided at its rear end with acurved slot 11, the headed-stud 12 extending through the slot from the rear lug 7, the force or lever-arm 13 having a rear loop 14, said lever-ar1n being provided uponitsrear face near its front end with recesses 15, to receive the lugs 6 and 7 and the intermediate face 16 meeting the face 10,

and the pivots 17 and 18, the former passed through the force or lever-arm and blade 8 at the meeting faces and 16 thereof, and the latter pin passed through the front lug 6 of the lower member and the front end of the force-arm or lever, the said rear1ng7 having its inner face provided with a countersunk threaded perforation, and a set-screw seated therein and at its outer end bearing against the rear end at the inner face of the movable blade 8,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

PASCI-IAL GREGORY OASPIAN.

Witnesses:

Vol-IROM KAYANZIAN, CHARLES W. EGGERT.