US382502A - Spring for scissors - Google Patents

Description

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,Y ...N u N E` Vv uw v (No Model.) i Y v l P. 4 AL-TMANN,

SPRING Posollssog, m

" UNITED STATES PATENT OEETCE.

A FRANK C. ALTMANN, OF N'EVV HAVEN, CONNECTICUT.

SPRING FOR SCISSOR'S, 86C.

SPECIPICATO'N forming part of Letters Parent No. 382,502. dared May 3,1888. Application filed July 5, 18S?. Serial No. 243.361. (No model.)

To all whom, it may concern,.-

Be it known that LFRANK C. ALT'MANN, of New Haven, in the county of New Haven and State of Connecticut, have invented a new In1- provement in Shears; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the saine, and which said drawings constitute part of this specification, and represent, inv Figure 1, aside view of a pair of shears, showing the spring applied thereto; Fig. 2, a longitudinal section through the pivot portion of the shears, enlarged; Fig. 3, a sideview of the spring detached, enlarged; Fig. 4, a modification in the spring.

This invention relates to an improvement in shears, having for its object the application of a spring at the pivot of the shears, the tendency of which is to bear the blades toward each other as they work from heel to points.

Various appliances have been made to shears to cause the edges of the blades to work in close Contact throughout the stroke. By my invention I have verygreatly simplified and v cheapened the application of a spring and applied it in such manner as to act most directly upon the blades, and so that a bearing between the blades is positively secured from heel to points.

A represents rone bladeof a pair of shears, it being provided With the usual handle, B. C represents the other blade, and D its handle.

The-blades and handles may be of any known or desirable shape or construction, according to the purpose for which the shears are intended.

The two blades are bored at thepivot-pointl in the usual manner, and through the pivothole a pivot, E, is introduced. This pivot is constructed wit-h a head, F, at one Aend and provided with a nut,G, adapted to be screwed onto the other end. On the outside of one blade the spring H is applied. This spring is best made from sheetsteel, asvseen in Fig. 3, or other suitable elastic metal. Through it a hole, a, is formed corresponding to the pivothole of the shears, and the spring is adapted to lie upon the blade beneath the head or nut, as the case may be, (represented in Fig. 2 as vit takes a bearing upon the blade at the rear,

as at d. The plane of the spring is inclined to the plane of the blade and the under side of the head of the pivot, so that the head bears upon the spring forward of the pivot, as seen in Fig. 2, and so that the pressure of the head under the draft of the nut is brought upon the spring forward of the pivot, and consequently tends to force the spring hard upon the blades forward of the pivot, or with very considerable more force than that which is applied at the The spring having such f The pressure may be adjusted by the nut,

if desired; but the spring,made of suitable ma terial, once adj usted, will retain its elasticity indefinitely. The pivot therefore may be riveted down upon the blade upon the reverse side, as indicated in broken lines, Fig. 2.

To prevent the spring rotating upon the surface of the blade its rear end is connected with the blade-#say by a stud, e, in the bladethrough a slot in the spring, or maybe by an indentation in the spring, as seen at f, Fig. 4, the indentation setting'into a corresponding cavity in the blade, it only being required that the spring and blade shall turn together upon the pivot.

Instead of making the spring actually inclined upon its surface, the same resultwill be attained by making the springl parallel with the blade and forming a rise in the spring, asv

at g, Fig. 4, uponli'whioh the pivot-head will rest the same as upon the inclined surface. I

IOO

give the bearing of the head of the pivot uponv the blade at apoint forward of the body of the pivot.

I have said that the head or nut of the pivot may either bear upon the spring, and such is the fact; but,while I preferthe head to take the bearing, I wish to be understood by the term head as used in the claim to include either tbe head,whic.h is made an integral part of the body of the pivot, or the nut or a cellar applied thereto.

I do not wish to be understood as broadly claiming the arrangement of a spring upon one of the blades of a pair of shears,with a head or other device adapted to bear upon the said spring, so as to apply the pressure of the spring upon the said one blade, the tendency of the said spring being to draw the two blades together, as such I am aware is not new; but I ain not aware of a spring constructed to take a broad bearing upon theblade forwardof the pivot, whereby the tendency of the blade to rock upon its pivot is avoided.

I claim- In -a pair of scissors or shears substantially such as described, the combination therewith of the spring H, arranged upon one blade between the head of the pivot and the blade, the said spring constructed with bearing-points b b, distant from each other forward of the pivot, the said bearing-points turned downward from theplane of the spring onto the blade, the body of the spring inclined downward and'rearward beneath the head of the pivot, the head of the pivot taking its bearing upon the spring forward ofthe pivot, and the spring extending to the rear of the pivot and in slotted connection with the blade, substantially as described.

FRANK (l. ALTMANN.

Vitnesses:

JOHN E. EARLE, LILLIAN D. KELsEY.

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