US1934118A - Cap wrench - Google Patents

Description

NOV. .7, 1933. c w DRAPER 1,934,118

CAP WRENCH Filed Jan. 25, 1932 INVENTOR [A Ciastarifirapar W Maw/6M k.) U ATTORNELS Patented Nov. 7, 1933 x UNITED STATES PATENT OFFICE.

GAP WRENCH Chester W. Draper, Detroit, Mich.

Application January 25,

4 Claims.

The invention relates to'wrenches more particularly designed for use in tightening or removing the screw caps of jars. It is the object I of the invention to obtain a construction which as hereinafter set forth.

In the drawing:

Figure 1 is a perspective view of my improved wrench;

Figure 2 is a bottom plan view thereof.

A is a jaw member, preferably a sheet metal stamping provided with a segmental edge B for fitting about the cap. C and C are lever members, also preferably sheet metal stampings, said levers being secured to the jaw member A by the pivots D. Each lever member comprises a handle portion E, an outwardly extending bell crank arm F and an inwardly extending bell crank arm G. One of the arms G is bifurcated at H to embrace a rounded end H of the other arm so that a movement of one of the levers relative to the jaw member A will impart an opposite movement to the other lever. I is a segmental band, preferably formed of wire and forming a complement to the jaw member A. The opposite end portions of this band pass adjacent to the side edges of the jaw member A and have at their ends hooks J which engage apertures in the bell crank arms F. The jaw member A has projecting outward therefrom thumb pieces K which enable the operator grasping one of the handles E to move the same relative to the jaw member so as to expand the diameter of the segment I.

With the construction as described, to apply the wrench to a cap the operator grasps one handle and by pressing his thumb upon the member K can swing both handles outward. In so doing, the band I will be drawn in laterally due to the angular movement of the bell crank arms F and this band has suflicient resiliency to return the parts to normal position when the pressure of the thumb is released. Thus after the operator has engaged the band with the cap upon releasing pressure of the thumb the two handles will close together in a position to be grasped in the one hand. The operator then presses these handles together which will produce a movement in the opposite direction in the member A and the band I, thereby tightening the grip upon the cover to clamp the same. By reason of the favorable leverage suflicient clamping pressure is de- 1932. Serial No. 588,767

veloped without great exertion upon the part of the operator, who can then readily either screw or unscrew the cap.

As the members A, C andC' are sheet metal stampings, and the member I is formed of wire,

the cost of manufacture is relatively low.

What I claim as my invention is:

1. A cap wrench comprising a segmental jaw member, a pair of levers pivoted thereto and interconnected to swing in opposite directions, a

band member complementary to said segmental jaw and having its ends connected to said levers, and a thumb piece on said jaw member for the purpose described. 1

2. A cap wrench comprising a pair of lever members and a segmental jaw member, all formed of sheet metal stampings, said lever members being pivotally secured to said jaw member and being each provided with outwardly and inwardly extending bell crank arms, the inwardly extending bell crank arms pivotally engaging each other, and a band. complementary to said jaw member having its ends pivotally. attached to the outwardly extending bell crank arms.

3. A cap wrench comprising a segmental jaw member, a pair of lever members pivotally attached thereto, each of said lever members having a handle portion and outwardly and inwardly extending bell crank arms, said inwardly extending bell crank arms having a pivotal engagement with each other, a wire band complementary to said jaw member having hooked ends engaging the outwardly extending bell crank arms of said levers, and thumb pieces on said jaw member for the purpose described.

4. A cap wrench comprising a segmental jaw member, a pair of levers pivoted thereto, a substantially U-shaped band having its ends connected to said levers, a thumb piece on said jaw member by means of which one lever may be moved outward, the resiliency of said band returning the same to its normal position and an interconnection between said levers to cause the same to move outward and inward simultaneously.

. CHESTER W. DRAPER.

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