US88232A - Improvement in wire for shoe-pegs - Google Patents

Description

ELMER TOWNSED, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN WIRE FOR SHOE-PEGS.

Specication forming part of Letters Patent No. 88,232, dated March 23, 1869.

To all whom t 'may concern:

Be it known that I, ELMER TOWNSEND, of Boston, in thecounty of Suffolk and State of Massachusetts, have invented an Improvement in Polygonal W'ire for Pegs; and I do hereby declare the following to be a full and correct description of the same, reference being had to the accompanying drawings, in which- Figure l is a perspective view of a spool, upon which is reeled both plain and twisted wire, made according to my improvement. Fig. 2 :is a side view of a piece of the plain wire. Fig. 3 is a side view ot' a piece ot the wire twisted; and Fig. 4 is a cross-section, showing the peculiar form in which the wire is drawn.

In these figures, a. marks the spool, b the plain wire, and c the twisted wire.

The manufacture of shoe-pegs from twisted polygonal wire is secured to T. Briggs Smith by patents, ot' which I am joint owner. Various forms of wire were suggested in those patents, among them one triangular and another lenticular in cross-section. In the practical development of that invention extensive eX- periments have been tried with wires of the forms mentioned; but, though they give good results, experience has shown that in order to give the wire the requisite number of threads to the inch to secure the best holding-power, an amount of twisting is necessary which tends to break down the Jber of the central portion ot the wire and impair its strength.

My ett'orts have been directed to a remedy for this ditliculty, and I have succeeded in discovering it in the present invention, which consists in making the sides of the triangular` wire concave, as shown in Fig. 4. A wire of this cross-section has less of the material in the center, and will bear more twisting Without injury to its strength than one with iiat sides. Hence a greater number of threads to the inch can be obtained, and a deeper and sharper thread is produced, securing greater holding-power to the peg cut from it, both by its increased lateral penetrationV and its diminished liability to draw out.

What I claim,aud desire to secure by Letters Patent, is-

Giving a concave form to the sides of a triangular wire for the manufacture of shoe-pegs, for the purpose set forth.

The above specification of my said invention signed and witnessed at Boston.

ELMER TOWNSEND.

Witnesses:

CHAs. P. GORELY, CHAs. F. STANsBURY.

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