US1033159A - Shoe-nail. - Google Patents

Description

G. A. CURTIS.

SHOE NAIL.

' APPLICATION FILED NOV. 14, 1911, 1,033,159. ,Patented July 23, 1912.

wi'hzeasea Qlhvenlorf attdEl ia w 4 of Medford, in the State of Massachusetts, tain new U STATES PATENT GFFICE.

GEORGE A. CURTIS, 0F MEDFORD, MASSACHUSETTS.

SHOE-NAIL.

a shoe nail having an improved form oftapering portion having a less tendency to cripple While driving than the ordinary nail now in use, and which portion is longer, relatively to the length of the shank portion, than usual, resulting in advantageshereinafter described.

A further object is the provision of such av nail having a formation that will present no anglealong the inner curve of the' clenched end to bear on the surface of the work held by such clenchedend. To these ends the invention consists in-the nail substantially as hereinafter described and claimed.

Of the accompanying drawings,-Figures 1 and 2 are side elevations of two ofiny improved nails, one being straight and the other showing the result of the clenching operation. line 33 of Fig.1. Fig.4 represents'a sec} tion on line 4 4 of Fig. 1. Fig. 5 represents a section on line of Fig. 1.

Similar reference characters indieate'the same or similar parts in all of the views.

The round and transversely notched shank a and head b mayb as indicated, according,

to a well known form of shoe nail; but the tapering portlon is longer, relatively to the length of the shank, than usual, this greater length being possible due to the novel form of said tapering portidn. as presently described. Said tapering portion is formed with four flat sides 0, c, c, c, which meet each.

other at a righting-lo said flat sides being en'uctlyalike and equal tofea h other and straight- 130111 'wl'iere they join the round shank p tion at d to a slightly rounded tip e, so that. a transverse section on either of the lines 3.. l or 5 of Fig. 1, or between those line will in square as illustrated in Figs. 3, e ant 5. it will now be understood that if the tape ing portion were sou'iewhat {lattened to oral or rhomboidal form, and still made as long shown in F igi 1, the stock Specification of Letters Patent. Application filed November 14, 1911. Serial No. 660,238.

'flat sides.

Fig. 3 represents a section on Patented July 23', 1912.

would be so thin at intermediate points,

especially from line 4 to line 5, that the nail would be liable to cripple when being driven; in other words, to bend and go crooked before getting through the work.

But owing to --my improved structure of square cross section from end to, end of the taper, the said taper can extend unusually far up from the tip and still'leave suflicient thickness of stock to insure straight driving,

as seen by reference to Figs. 4 and 5. Thjs increased length 'oftaper; increases the length of the portion of the nail which is capable of being curled up by the usual clenching operation, and therefore there need be less careful selection of lengthv of nails to suit particulargthicknesses of Work.

In other words, 'one lengthof nail can be' used for a greater variety of thicknesses of work. Another advantage is that when the Y nail clenched, it practically invariably curls in a plane parallel with two parallel In other Words, it curls, as shown inqFig. 2, with one. fiat side a forming the inside of thelcurl. This "is because the greater thickness on a line intersecting the center and two angles resists curling in such direction as to bring an angle inside the curl. Therefore, although the nail may curl in eitherone of four directions, it wi l be practically certain to so curl that a flatside will bear .onthe surface of the work through which the nail is driven and against which surface the inside of the curl bears, and con sequently the inside of the curlwill present no angular rib to cut into the Work.

I claim A shoe nail having a tapered portion square in cross section and presenting four 'liat sides which converge toward'the tip,

said tip being rounded, all four cornersv or angles between said flat sides also converg-' ing toward the tip, whereby said-tapered portion will possess the same square cross sectional shape at different distances from the tip but gradually of less cross sectional area toward theti'p. v I

In testimony whereof-1 have Rflixed my signature, in presence of two witnesses.

GEORGE A. CURTIS.

Witnesses:

A. 7. HARRISON, P. W. Pnzzn'r'ri.

Washington, D. G.

addressing the Commissioner's? Patents,

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