US52155A - Improvement in wrenches - Google Patents

Description

UNITED STATES ATILNI rrrca.

EDWARD P. FURIION G, OF WESTBROOK, MAINE.

IMPROVEMENT IN WRENCHES.

Specification forming part of Letters Patent No, 52, H55. (lated January 23, 1866.

To all whom it may concern:

Be it known that I, E. P. FURLONG, ot' Westbrook, in the county ot' Cumberland and State of Maine, have invented a new and useiul Improvementin Wrenches andI hereby dcclare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part ot' this specification, in which- Figure l shows a perspective of my improvement applied to a hand-wrench; Fig. 2, an end view ofthe same and a nut of a screw between the jaws.

My invention consistsin providing the jaws of a wrench with a groove or grooves, with the objects and for the purposes hereinafter described.

Frequent. and considerable inconvenience is experienced by mechanics in the use of wrenches as at present constructed-namely, with a smooth or ungrooved face to the jaws. In many of the uses to which this tool is put it has been found impossible, especially where an exertion ot' some strength is requisite, to obtain a sufficiently tirm and powerful grasp with the jaws except after numerous and repeated trials, depending, as the eectiveness ot' the tool does, upon the simple tightness with which it can be made to grasp the thing to be moved or turned. IV hen applied to the nuts of screws the frequent slipping off of the wrench amounts to something more than an inconvenience, and works a positive injury to the nut itself. In time the edges or corners of the nut become worn or broken oftbythe slipping of the wrench-jaws, thus destroying the form ot' the nut and rendering it more difficult at each successive trial to get a tirm hold upon it with the wrench. These inconveniences are obviated by my invention. In the case of a nuttlie bearing ot' the wrench-jaws is not upon the corners or edges ot' the nut, but upon its sides, as illustrated at Fig. 2 of the accompanying drawings. lhe object grasped is by this improvement both held more iirml) and without injury. Employing even a moderate tightness, it is impossible for the wrench to slip.

A represents the form of the grooves as applied by me to an ordinary liand-wrench, it heing made V-shaped, and extending across the jaw longitudinally, as represented in the drawings.

I do not claim roughing the inner faces ot' the jaws of a wrench by numerous small grooves, so as to create a number of small edges to improve 'its power in holding anything to which it is applied; but

What I do claim, and desire to Letters Patent, is-

Constructing a groove on the inner face ot the jaws ot` a wrench, as and for the purposes described.

secure by EDWARD r. FURLONG.

Vitnesses WILLIAM H. CLIFFORD, JOHN I. BOYD.

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