USRE3294E - Trustee of the moka y - Google Patents

Description

UNITED STAT-ES PATENT OFFICE..

GORDON Manager BOSTON, MnssAcnUsErrs, TRUSTEE or THE MUKAY sEWINor MACHINE COMPANY, AssIeNEE or si w. BALDWIN.

|'MPROVED NAIL FOR Llan'rl-'iian-WORK.l

Speciication forming'part of Letters Patent No. 44,382, dated September 27,1861; 'Reissue Ne. 8,294, dated February'Q, 1869; I i

To all 'whom 'it may concern;

Beit known that STEPHEN W.'BALDWIN, of Baldwinsville, in the county of Onondaga, Stateof New York, has invented van Improvement in N ailing Leather-Work, of which the following, taken in connection with the 'drawings which accompanyiand form part of this specification, is a description suiicient toen- 'able those skilled in the lart .to practice the invention.

'The inventionl relates principally to the manufacture of boots and shoes', and .other articles of leather-work, with reference to the means employed to fasten together the soles and vamps of boots and shoes, and the parts of lharness-traces, &c. The means employed for this purpose heretofore have been the various stitches made by hand and. by machine, wooden'pegs, (as seen in the common pegged boots and shoes,) and metallic nails, cement also being used to some extent.

.This invention consists lin a headless nail of peculiar construction, which nail may, if desirable, be driven into a hole previously i prepared in the leather by an awl, or instrument'having1 a form at its puncturing end corresponding or approximating to the form ofthe nail, as will be hereinafter set forth;

-the inventionalso consisting in vpieces or articles of leather-Work having their` parts united by headless screw-threaded ror twisted nails, hich, being driven by percussi-ve blows, turn they are driven, and hold the parts 4secure y together by 'reason of their twist.

The peculiarity of this improved nail which distinguishes it from all other headless nails is that it is made vwitha screw-thread, formed by a twisting tlin edge or feather-like pro- -jection on 'each side of the nail, which projection, entering .the leather laterally as the' nail is driven, causesthe threads to hold or, as it were, clingdto the leather, and presenting a greater .resistance to the extraction of the nail, and rendering parts secured thereby-less liableto separation than if this twistingl edge were formed of two adj acent planes or sides of a square or prismatic naal; and

the invention consists in a twisted and headless screw-nail, (made turn when `driven,)

or salient edges.

One object'of the improvement is toenable a nail to be constructed from thin sheet metal, having a holding-power beyond what is due to the form of the material as cut straight from a plate, a very strong holding-power being atl tained in a very slight amount of metal, which d oes not possess strength and rigidity enough to enable -it to be driven into the leather, excepting by the preaction of the.awl, but which, when driven in, has advantages in its holding-power far beyond that possessed' by the' common shoe-nails or wooden pegs.

Figure l represents an elevation of -the nail;

' Fig. 2 a'n end view of'it 5, Fig. 3, an edge view ofit; ig.v 4, a view of au awl or puncturing tool, which may be used to form a' hole for entrance of the nail.

The nail shown in the drawings is cut or stamped out from a sheet or plate in along and somewhat'triangular form, (the top of the nail having a width very much greater than its thickness,)v and a twist is then given in the lengthof the nail, the point, as shown, being twisted about ninety degrees, which amount,I however, may be varied as circumstances may require.

The point of the awl (shown at Fig. 4) has asimilar twist, the awl-point being, made of suiiic'ient strength 'or rigidity to enable it to lbe'dri'ven into the leather r-to make the puncture for the, nail, the twist upon the awl giving the instrument a rotary motion asfit is4 driven, conforming to said twist. Upon removal of the awl, the nail may be easily drlv'en `into place'withoiit' bending or breaking it.

The twist in the nail causes the pieces of leather to be held very firmly together. It"

the nail were regular in formation, the leather would easily slip upon 'the surfacethereof;v

but when twisted, it mustbe turned,.or one -or both of the p'eces of leather turned, be-

fore they can be separated, excepting by a greater strain than can be brought upon the pieces o f leather by ordinary wear.

New, if we suppose the center ofthe nail t0 be represented by a portion of metal .square iii-section, or of a width equal to the thickness of the nail, then the metal on each side of this central part will form the' proiecting edge to which the twist is given, which edge, by its twist and by its shape in transverse section, has a holding-power superior to that possessed by any nail or peg heretofore made which could be driven .by percussion, the entering edges preventing that dispositionto rotate anddoosen (under endwise strain) possessed fby all other screw or twisted nails heretofore ,made to be driven by percussion, which turn as they are driven, by virtue of their twist.

As the lower end of the nail is quite nar-l row or tapering, the point is generally to be clinched upon the stock.

The great width given to the top of the nail shown in thedrawings, in proportion to its thickness, prevents wear of the stockaround or against the head sutlicient to start the nail or to start the leather from position.l

The nails are made headless, in order that the ends of the nailmay be sunk ilush with the surface into which they are driven, the same as are wooden pegs. Y

What is claimed is- 1. A headless nail, 'having thin twisting edges substantially as described.

2. rticles of leather-work having their parts fastened together by headless screw# threaded or twisted nails, formed 'substantially as described. t

, GORDON MCKAY, Trigg?? oftheMcKay 4 ing-Machine Association.

, Witnesses:

J. B. CROSBY, A FRANCIS GoULD.

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