US26906A - Improved stitch - Google Patents

Description

A. P. JOHNSON. LOCKED GHAN STITCH.

No. 26,906. Patented' Jan. 24, 1860.

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UNITED STATES PATENT OFFICE.

A. F. JOHNSON, OF BOSTON, ASSIGNOR TO ALFRED B. ELY, OF NEWTON, MASSACHUSETTS.

IMPROVED STITCH.

Specification forming part of Letters Paten-t No. 26,906, dated January 24, 1860.

To am whom it may concern;

Be it-.kf'nown that l, A. F. JOHNSON, of Boston, in the county ofr Suffolk and State of Massachusetts, have invented a new and I1nproved Stitch for Sewing Cloth, Leather, Src., which I'terin a Locked Chain-Stitch, and of which the following is a full, clear7 and exact description, reference being had to the accompanying drawings, making part of this specification, in which Figure l is a plan of the upper or right side;

Fig. :2, a plan ot the under side; Fig. 3, a side view.

The stitch which is formed by the combined operation of a needle and shuttle and known as the shuttle-stitch, while it possesses certain properties of a perfectstitch, has. yet others which are objectionable, such as the ,non-elasticity ofthe stitchV in thin material, by which the threadis rendered liable to be broken by a direct pull or strain upon the cloth in the direction of the seam. A second objection to this stitch for family use arises from the ditheulty of adjusting the tension upon the two threads so that theyshall be equally drawn into the cloth, in consequence of which one or other of the threads is liable, upon thin niaterial, to lie straight along the seam, in which case it is easily broken by a direct strain, and at each break of this thread several stitches upon-each side of it are unraveled. :Thestitch known as the chain7 or i loop77 stitch is not liable to the objection of non-elasticity, and is consequently not so Veasily broken `by a direct strain as the former; but it is open to the .objection that it is easily raveled out if the thread be drawn in a particular manner, as is also the double-looped stitch formed by the interlocking of'two threads and known as the Grover is Baker stitch.

Hy invention hasl for its object to combine the desirable qualities of bot-h the shuttlestitch and chain-stitch and to avoid the objections to whicheach of these is liable, and this I accomplish by means of niy improved stitch, which consists of a chain-stitch, each loop of which has an auxiliary or locking thread passed through it.

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

In the drawings, A is the cloth; f, the u p. per or needle thread, which. is formed into a series of chain-stitches, each loop of which carries a binding-thread, g, which is passed through it, and by which it is locked, so that it cannot be raveled or drawn out by pulling upon either threadat any point.` 'The stitch shown in the accompanying drawings is formed by an ordinary chain-stitch needle and single thread'and a revolvinghook, the operation of which is more fully set forth and described in an application for patent made simultaneously with this. When thus made the binding-thread .is passed around, under, and

through eachloop-of the chainfstitch seam, which is twistedhalf-round, as seen lin the drawings. This is the form of my stitch which I prefer, as the binding-thread, being wound partly round the loops of the chain-stitch, is'

also rendered elastic and not liable to be easilybroken. A. The stitch may, however, be made by passing a shuttle with a bindingthread througheach loop o f a chain-stitch, which latter may be made with au ordinary needle and vibrating hook, or in any wellknown and suitable manner; or the cha-institch may be formed in the customary man-i ner, and theA loops may be passed over the point of 'a stationary-shuttle; or the bindingthread, in lieu of being passed through every loop of the chain-stitch, may be thrown through every second or third loop.

It is obvious that when the chain-stitch is made, as above described, with a reciprocating hook and a stationary or a reciprocating shuttle, the loops will not be twisted, as is the case where the revolving hook is used, and

the binding-thread will be straight along the seam without passing' around the loops, as before described. Vhen, however7 the stitch Vis made with a revolving hook it will have all the elasticity of the ordinary chain-stitch, together with the properties of a fast or tight stitch, in a far greater degree than they are possessed by the shuttle-stitch, for should either one'oi the threads of the latter break at any point, several stitches, both before and behina ie, winbe dropped; but sheuld the bind- The Seinen herein aeseribed, eensisting ef n ing-thread of theoeked ehainstiteh bebroken chain-stitch hzwing :n bindingllnfezul passed no stitches will be dropped unless the thread. throngh its' loops, -for the purpose described.

of the ehain-sti'ell be also broken at the sa-nle A. -F. JOHNSON.

point. Y Witnesses:

What I claim as my invention, and desire to SAM. COOPER,

secure by Letters Patent, is P. E. TESCHEMACIIER.

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