US397896A - Island - Google Patents

Description

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J. A. COLEMAN.

HORSESHOE NAIL. v No. 397,896. I Patented Feb. 19, 1889.

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JOHN A. ("OIFBIIAN OF PROVIDENCE, RHODE' ISLAND.

HORSESHOE-NAIL.

SPECIFICATION forming part of Letters Patent No. 397,896, dated February 19, 1889.

Application filed April 21, 1887. Renewed July 25, 1888. Serial No. 281,022. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN A. COLEMAN, a citizen of the United States, residing at Provideuce, in the county of Providence and State of Rhode Island, have made a new and useful Invention in Horseshoe-Nails, of which the following is a specification.

My invention relates to horseshoe-n ails; and it consists in the formation of a horseshoenail in a new and useful manner, substantially as hereinafter described and claimed.

In the drawings, Figure l is a side view of a completed horseshoe-nail produced according to my invention. Fig. 2 is a cross-section of Fig. 1, through the central part of the nail, on the dotted line 00 a of Fig. 1. 3 is a cross-section through the portion of the nail where the head and body parts join, on the dotted line 1 y of Fig. 1; and Fig. 4, a crosssection on dotted line y y. Fig. 5 is a side elevation, partly in section, of the punch and die apparatus for striking up the head of the nail-blank from the drawn wire used in the formation of the nail. Figs. 6 and '7 are side and edge views of theheaded blanks. Fig. 8 is a view of the rollers that are used for drawing down the shank and forming the point of the nail upon the blank. Fi 9 is a side view of a piece of the drawn wire which is used to form the nail-blank. Fig. lOisa cross-section of Fig. 9 upon the dotted line 00 as.

My invention consists in using drawn wire for the manufacture of horseshoe-nails and the production of the completed horseshoenail from such drawn wire byainethod which shall preserve intact the shell of hardened metal which is produced in the process of drawing wire upon its exterior, and surrounds a central core of softer and ductile metal within the body of the wire. In Figs. 2, 3, and 10 I have represented this exterior shell surrounding the internal core of the wire as somewhat thickened or exaggerated in proportion and terminating more abruptly at its lines of junction with the core than it actually is in the wire, for the better illustration of the same. I first take the piece of wire cut off of suitable length to form the blank shown in Figs. 6 and 7, and place it in the dies shown in Fig. 5, and strike up the head of the horseshoe-nail upon it, thus forininga blank. This striking up is done by an endwise compression of the metal. This process causes the outer shell, as well as the ductile core I) of the drawn wire, to be entered into and united with the head of the nail, so as to become homogeneous with it, and so as to impart the strengthening and stiffening properties of the outer shell to the point of junction between the head and shank of the nail, where the strain of the shoe comes upon it when it is driven into the hoof through the shoe in the usual manner. It also leaves the shank of the blank with its hardened outer shell portion and internal ductile core so nearly thesize of the finished nail that the subsequent drawing-down processes required to give the shank its ultimate form in the finished nail are so slight as not to impair or inj ure the outerhardened shell which the drawn wire had in the outset. I next take the nailblank so formed by the heading-up process, and, placing it between the rollers'shown in Fig. 8, I draw down the shank and point of the nail thereby. In accomplishing this drawingdownprocess I finish off the point of the nail by cold-rolliu g, with sufficient pressure to give it the requisite hardness and stiffness throughout its entire structure; but I apply onlysufficient pressure to the shank part of the nail above the point in.rolling it down to reduce it to the proper form without destroying the softness and ductility of the core of the wire employed.

Any clipping or cutting of the point of the nail to reduce it to proper form should be confined entirely to the point portion, which is hardened throughout by the rolling process, and not be extended into the hardened shell surrounding the ductile core above the point. By thus drawing the nail down from the blank I leave the soft and ductile core of the latter surrounded by the original tubular hardened shell of the wire the entire length of the nail from within its head to its hardened-point portion, thereby producing a shank of the nail having superior stiffness for driving into the hoof to secure the shoe upon it without impairing the capacity of the ductile central core to endure clinching over the hoof in the usual manner after the nail has been driven in. All parts of the shank of the nail being surrounded by this hardened outer shell of the wire, which is incorporated into and hemogeneous with the head of the nail at one end and with the hardened point of the nail at the other end, and is unbroken. and uuinn paired from the head to the pointon all sides of the core, it impossible t'orthe nail to split 1 V shanks are reduced by hammering or comin driving into the hoof.

I am aware that horseshoe-imils have heretofore been out from a nail-plate which was previously cold-rollml upon the opposite surfaces and that these cold-rolled opposite surfaces formed in the finished nail so out from the plate hardened shells or walls upon two sides of the plate, between which was a soft and duct 110 core, thus sti t't'eningthenail-shank to some extent; but the opposite hardened st'lrtaces in this nail were separatet'l at the edges of the nail where it was out from the plate by the soft central core lying between them, and they differed from my nail in havingno outer hardened-shell portion alonthe edge uniting the shell portion upon the oppo site surfaces of the nail, and were consequently not so stiff and more liable to bend in driving into the hoof, as well as to allow the hardened shell portions upon the opposite faces to g i the nail therefrom and drawing down the split oil. from the nail.

I am also aware that horseshoenails have f without substantially impairing the hardened shell of the wire which surrounds the ductile been produced by taking a soft-iron blank eutitrom hot-rollet'l metal and rolling down the shank part and point of the nailthereifroin by more or less eold-rol 1 ing', wh ieh prot'luces a partially-liardened shell around the central duetile core; but the shell so produced (litters from 1 that upon my nail. in not having the same thickness where the head and shank partof i t i i the. nail unite, and in not being incorporated in the intimate manner with the head part which exists in the nail formed by me, as hereinbet'ore described.

My nail also (litters t'ronl nails in which the pression while hot, in the superior stiffness of the shank, due to the outer hardened inclostug-shell. thereo't',\\'hieh does not existin nails thus formed.

Instead of using drawn wire rectangular in eross-sectimi, other fOl'lllS oi drawn wire ma; be un )lo c(.l and reduced to the term required in the finished nail by suitable compression upon. it at different points, which will leave the outer shell of the wire snrrounding the ductile core portion of the nail intact and incorporated with the head and point portion thereof, substant tally as hereinbetore described.

'hat I claim as new and of my invention is As a new article of manufacture, a horseshoe-nail formed of drawn wire by the process of strikingup and enlarging the head of shank and hardened-point portion therefrom central core portion of the nail, substantially as described.

JOHN A. ("OLEMAN Witnesses:

JOHN W. lmeaN, WILLLtM .I'I'. BARRON.

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