US741576A - Shears or the like. - Google Patents

Description

PATENTED OCT. 13, 1903.

F. D. DAVIES.

SHEARS OR THE LIKE.

-APPLIGATION FILED FEB. 24. 1903.

N0 MODEL.

ATTORNEY UNITED STATES Patented October 13, 1903.

PATENT OEEtoE.

FREDERICK D. DAVIES, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE- IIALF TO FREDERICK O. BONNY, OF BROOKLYN, NEW YORK.

SHEARS OR THE LIKE.

SPECIFICATION forming part of Letters Patent No. 741,576, dated October 13, 1903.

Application filed February 24,1903. Serial No, 144,592. (No model.)

T0 (0% whom it may concern.-

Be it known that I, FREDERICK D. DAVIES, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Shears or the Like, of which the following is a specification.

This invention relates to improvements in the means of pivotally connecting the blades of shears, scissors, and other instruments of a similar character, also including means for continuously exerting a meeting tension upon such blades from heel to point during their cutting action.

Myimprovements further compriseasimple and extremely economical method of uniting such pivotal instrument members, avoiding complicated construction, and after assemblage of the parts enabling the riveting operation to be performed efficiently with a single pressure, also attaining correct adjustment with infallibility.

In brief, myinvention consists in providing enlarged pivotal apertures through the hearing portions of the instrument and uniting its two operative members with an eyelet or hollow rivet, a tensional washer being interposed between the bearing portion of one or both members of the shears or the like and the flared peripheral edge of the eyelet or hollow rivet to cause the two blades or like members to incline toward each other through out their pivotal movement.

In the drawings accompanying this application, Figure l is a front elevation of a pair of shears embodying my improved tensional pivoting means. Fig. 2 is an enlarged 1ongitudinal section taken on the line or :r of Fig. 1; and Figs. 3, 4, 5, and 6 are respectively plan views of difierent forms of tensional washers which I may employ.

One difficulty met with in riveting shears and the like with the ordinary form of studrivet lies in applying such direct blows upon the rivet as to avoid bending it, and thereby forming an imperfect pivot. Further, a succession of skilfully-applied blows must be struck in order to accomplish the riveting operation,and not infrequently the union effected by this means proves either too tight or too slack in character to provide a satisfactory pivotal action. In overcomingthese objections to the ordinary method of studriveting I employ an eyelet or hollow pivot, formed, preferably, of steel, but which may be of other suitable material, the same being indicated by the letter A. Said eyelet when inserted within the enlarged apertures provided as pivotal bearings in the shears is riveted therein by turning over its opposite peripheral edges, forming the flanges Ct at. This is rendered easy of accomplishment by inserting a tool within the eyelet prior topressing out its edges, 21 single pressure movement of the riveting implement serving to produce the flanges a a.

B B indicate tensional washers, which are applied one at each side of the shears about the ends of the eyelet A before the peripheral edges of the latter are pressed outwardly. Thus in the riveting operation the said washers are compressed between the flanges a a and the surface of the shears, whereby the tension of said spring-washers is exerted to press the two pivotal shear members O D together, imparting a superior cutting quality to their meeting edges in their pivotal movement.

While I prefer to employ the tensional washers at each side of the shears, I may apply one of such washers at one side only, in which case the opposite peripheral edge of the eyelet will be riveted directly upon the shears. As promised, the said tensional pivotal means of connection may be employed with other instruments of a similar bipart pivotal character.

In Fig. 8 will be seen a plan view of my preferred form of tensional washer, its innor concentric portion a being cup-shaped, as seen, and provided with radial slits a extending from its inner edge to an intermediate point in the circumference, to impart a higher degree of resiliency. Fig. a shows a similar form of tensional washer, excepting that radial slits a are provided, which extend from an intermediate point to the outer edge of the circumference. Fig. 5 shows a fiat washer having a single radial slit C04, the divided end portions approximating thereto being separated vertically to impart a degree of tension when said washer is pressed between two opposing surfaces;

that the slit, as a, is formed tangentially.

However, I do not limit myself to these par-' ticular means of rendering the washer A resilient, but have described the said several forms as practical examples.

Having now described my invention, I declare that what I claim is- 1. A hollow pivot as the connecting means for a pair of shears or the like, a flange turned about said hollow pivot, and a tensional washer held by said flange and exerting pressure against the adjacent shear member.

2. Means of connecting shears and other bipart pivotal instruments, comprising an eyelet within the conterminuous apertures in the instrument members, the opposite peripheral edges of said eyelet being turned FREDERICK D. DAVIES.

Witnesses:

S. E. BnUzLns, F. W. BARKER.

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