US158205A

US158205A - Improvement in cutting-pliers

Info

Publication number: US158205A
Authority: US
Publication date: 1874-12-29
Anticipated expiration: 1891-12-29

Description

" T. P, FARMER.

Cutting-Pliers.

Patented Dec. 29, 1874.

NdA-58,205.'

sims

UNITED STATES A TENT OFFICE.

THEODORE P. FARMER, OF BOSTON, ASSIGNOR TO EDWARD M. FARNS- WORTH, OF REVERE, MASSACHUSETTS.

IMPROVEMENT lN CUTTINGPLIERS.

Specification forming part of Letters Patent No.158,205, dated December 29, 1874; application iiled September 15, 1874.

'To all lwhom it may concern Figure 1 is an elevation of my improvedl pliers. Fig. 2 is a section on the line a: w of Fig. l. Fig. 3 is a longitudinal central section.

The ordinary pliers for cutting wire, Cac., are so formed that each cutter and its jaw are formed in one and the same piece, which is objectionable for the reason that when the cutter becomes worn away, so as to be of no further use, the entire tool must be discarded and a new pair of pliers purchased to supply its place. To avoid this objection is the purpose ot my invention, which consists in apa-ir ot' pliers, each jaw of which is provided with a sliding cutter made adjustable in or on ways by means ot' a screw placed beneath it, which construction admits of the cutters being readily removed to be sharpened, and advanced from time to time as they become worn to bring them to their proper cutting posit-ion.

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A B represent two levers pivoted together at a, the lower portions ot' the levers forming handles, and the portions above the pivot a forming jaws b c,

each of which is provided at, its top with a horizontal dovetailed groove, d, passing centrally through it, into which snugly lits a corresponding dovetailed projection, e, formed on the under side of a cutter, h, which construction admits of its being slid back and forth therein, and removed therefrom when desired. The rear of each jaw and its cutter are cut away, so that whenV in position a circular recess, t', will be formed for the reception ot' the head oi'a screw,m, thethreaded portion ot'which turns within the front portion of the jaw. The inner portion of the head of the screw m bea-rs against the shoulder formed by the inner end of that part of the recess z' cut within the projection e on the under side of the cutter, which, when worn away, can thus be advanced by turning the screw m so as to bring the'cut` ting-edge to its proper central position, the screw also serving to hold the cutter and prevent its being forced back out of place in the operation of cutting.

By removing the screw m, the cutter may be readily slid out of its place in the jaw, for

the purpose ot' sharpening, and when worn out may be replaced by a new one at a tritling expense.

The cutting-edge oi' each cutter is beveled on both sides, as seen in Figs. l and 3, whereby the liability of its being broken is greatly diminished.

Instead of each cutter being provided with a projection sliding in a groove in the jaw, the latter may be constructed with a projection, over which may slide the cutter having a correspondiugly-shaped groove. By thus causing the cutters to slide in or on guides, their edges are kept parallel, and contact throughout their entire length insured.

The above-described pliers are exceedingly economical, as they can be used for an unlimited period ot' time by simply renewing the cutters as they are worn out, and a considerable saving is thereby ettected.

What I claim as my invention, and. desire to secure by Letters Patent, is-

In combination with the jaws b o and the removable sliding cutters h, the adjustingscrews m, having heads arranged to slide in horizontal recesses t', formed in the jaws and eountersunk in the cutters, substantially as set forth.

Witness my hand this 12th day of' September, A. D. 1874.

THEODORE P. FARMER.

In presence of l). E. TEsoHEMAcHEE, W. J. CAMBRIDGE.