US250525A - Gobham geay - Google Patents

Description

(No Model.)

Wii E5555.

G. GRAY.

NAIL.

Patented'Demfi, 1881.

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UNITE TATES PATENT retort.

GORHAM GRAY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO M. STURGIS GRAY, OF SAME PLACE.

NAIL.

SPECIFICATION forming part of Letters Patent No. 250,525, dated December 6, 1881.

Application filed April 15, 1881.

To all whom it may concern:

Be it known th it i, GouHAM GRAY, ot Boston, illassachusetts, have invented a new and useful Improvement in Nails, of which the following, in connection with the accompanying drawings, is a description.

My invention relates to nails, and has for its object to produce a nail which, when driven in wood, leather, or other material, has a greater I0 holding-power than nails now commonly in use, and at the same time is not liable to split the wood into which it may be driven.

Spikes or nails have been previously made having concaved sides and a sharp point, the

shanks being twisted. In such nails,ho\\'ever, the edges form sharp threads, and the point, being wedge-like, is very liable to split the wood into which the nail is driven. I have discovered by experiments that this can be obviated by my invention, which consists in making the nail, having the ordinary rectangular cross-section and uniform thickness throughout its entire length, with a twisted shank having one or more complete half turns or twists, so that the point, which is rectangularin shape, is brought into the same position relative to the upper or head portions of the nail that itoocupics in the ordinary untwisted nails.

o In the drawings, Figures 1 and 2 show different side elevations of a nail embodying my invention; and Fig. 3, a section thereof on line a: m, Fig. 1.

The improvement is shown as applied to an ordinary out nail having a shank, a, of uniform thickness throughout its entire length, as shown in Fig. 2, and increasing in width from its point 2 to its head 3, as shown in Fig. 1. The point 2, being at its extreme end of the 0 same thickness as the entire portion of the shank, as shown in Fig. 2, when placed across the grain of the wood in the well-known mander, will break out the fibers or grain of the (No model.)

wood fora width equal to the thickness of the nail, and there will be no tendency to push or 5 crowd the said fibers aside to split the wood,

as when a wedge shape or sharpened point is employed.

In order to give greater holding strength and prevent the nail from being too easily 5o withdrawn from the wood, the lower portion of its shank is twisted,as shown at b, so that the edges 4 cross the direction of movement of the nail in withdrawing it and resist the said movement.

In order that the wedging action of the nail due to its tapering shape (shown in Fig. 1) shall always come in the same direction or lengthwise ot' the grain of the wood, a definite number of complete half-turns is given to the shank in forming the twist I), so that the unt-wisted point portion 2 ot' the nail is in the same relative position to the uutwisted portion near the head as in the untwisted nail. As shown in the drawings, three complete half-turns are made; but it is obvious thatany number might be made, the number depending upon the length of the shank.

I claim As an improved article of manufacture, a nail having a rectangular cross-section and uniform thickness throughout, provided with a number of complete half-turns in the lower portion of its shank, whereby the untwisted portions near the point and head of the nails stand in the same relative position to one another as in the untwistt d nail, substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 2d day of April, 1881. o

GORHAM GRAY. n s.]

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