US237030A - Horseshoe-nail plate - Google Patents

Description

UNITED STATES EATENT OFFICE.

JOSEPH M. LAUGHLIN, OF BOSTON, MASSACHUSETTS.

HORSESHOE-NAI L PLATE.

SPECIFICATION forming part of Letters Patent No. 237,030, dated January 25, 1881.

Application filed October 8, 1880. (No model.)

To all whom it may concern Be it known that I, JOSEPH M. LAUGHLIN, of Boston, Massachusetts, have invented a new and useful Improvement in Horseshoe-Nail Plates, of which the following is a specification.

My invention relates to improvements in the manufacture of nail-plates from which horseshoe-nails are to be made; and the object of my improvement is to provide a nail-plate which shall have that part of its edge from which the nail-head is to be struck hardened near one of its angles, so that the nails afterward out from it will have a head hardened at the point most requiring solidity.

In the accompanying drawings, Figure 1 represents a cross-section of a plate which has been prepared by the ordinary hot-rollin g process, having in its several parts the proper thickness, so that horseshoe-nails may be cut or punched therefrom with their heads at the edges of the plate and their points in the thinner middle part.

This plate, as shown, has upon its edge a ffiu or edge, g, which is formed as the plates are rolled into shape, by the escape of some portion of the metal between the ends of the operative parts of the rolls of the rolling-machine, which rolls, formed as shown in Fig. 3, have a series of passes or forming-intervals between them of the kind known as closed, or, in other words, separated from one another by collars b, formed upon one roll, preferably the under one, 1), running in channels a, made to receive them in the other roll, a. In these rolls the surface of the roll between the collars is made convex,.so that the plate rolled will have its flat side formed against the roll having the grooves a cut in it. By passing the nail-plates through the rolls, so as to have the flat side of the plate nearest the opening between the two rolls, the fin will be'left on the corners of the plate on that side. After the plates have been rolled, as shown in Fig. 1, they are taken, when cold, and passed between rolls (whose form is seen in Fig. 4) which, unlike those shown in Fig. 3, have the flat side between the collars t of roller 11 and the convex surface upon the roll h, so that the hot-rolled plate, whose cross-section is seen in Fig. 1, formed in the rolls. shown in Fig. 3, will, when turned over and passed between the rolls when cold, have the fin 9 brought into the angle formed by the flat surface between the collars z", and the collars and the rollers will force the fin back into the plate, and consequently harden that part of the plate marked 0, Fig. 2, thus forming a plate having a thicker part from which the heads of the nails are taken, which has its outer corner hardened, so that when the nails cut from this plate are driven the blows of the hammer falling upon a line axial with the shank of the nail fall upon a portion of the head better prepared to sustain the shocks than it would be if it were cut from a plate not so hardened.

As the horseshoe-nail has its head extending over one side more than the other the axial line of the nail passes much nearer one side of the head than the other, and consequently, as the force to drive the nail must be applied in the direction of that line, the force of the hammer must be exerted more nearly to one side of the head than the other, and as that side is the side formed of the angle of the plate into which the fin was compressed it is, by reason of being so hardened, better able to withstand the successive blows of the hammer, and keeps its form and does not so quickly become battered and rounded upon the corner nearest the axial line, and consequently is easier and more accurately driven than a nail with a less perfect corner, or a corner that would hold its shape less perfectly, and also is less liable to become bent while driving than would a nail whose head is uniformly soft. There will, therefore, be produced from the plate prepared as above described a nail which will retain the desiredform of head longer, and can be driven more accurately and easily than those out from plate not so prepared.

What I claim as new and of my invention 1s- A nail-plate provided on one or both edges with a ridge for the head of the nail, which is made harder near one of its angles than its main portion by compressing the metal forming such part by cold-rolling, substantially as described.

JOSEPH M. LAUGHLIN.

Witnesses:

L. O. RIoE, N. P. OGKINGTON.

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