US243093A - John watson - Google Patents

Description

J. WATSON. Bit Stock.

(No Model.)

No. 243,093. Patented Jun 21,1881.

INVENTOR WITNESSES:

ATTORNEY.

N PUERS. Phololimo nphor, Wnhiugtcm 0,0.

UNITED STATES PATENT OFFICE.

JOHN WATSON, OF BUFFALO, NEW YORK.

B|T-STOCK.

SPECIFICATION forming part of Letters Patent No. 243,093, dated June 21, 1881,

Application filed March 5, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN WATSON, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have made certain Improvements in Bit-B races for Auger-Bits, &c., of which the following is a specification.

This invention relates to a brace or socket for holding different bits, the object being to produce one that will accommodate any sized bit, and which can be put in by a mere push, and will be held securely until loosened to take it out, which is accomplished in an instant, the main object being to save time in taking out one bit and putting in another, one brace and handle serving for all; and the invention consists in its construction, as fully hereinafter explained.

In the drawings, Figure l is a vertical crosssection through the center of the shank or holder and outside case, showing the bit held by the gripes; Fig. 2, a top plan showing the ends of the shank, the gripes, and also thecentral hole for the entrance of the bit; Figs. 3 and 4:, details of the gripes, Fig. 3 being a front view, and Fig. 4 aside view.

A represents the solid metal shank, and B the outside metal case, being a shell fastened over the shank. The shank is made with the usual central hole, a, for the bit-shank to set in. In addition there are two recesses, b b, one each side of the bit-openin g a, in which are set spiral springs c 0, and connected to or in contact with these springs are two steel gibs or gripes, D D, one each side of thecentral shank,

.A, as shown, which is cut into curved ways (fitting the shape of the gripes) or slides, partly shown at h h, Fig. 2, for these gripes to slide in, and when a pressure is exerted on them (to put in the bit) they slide downwardly andinwardly. This enlarges the opening g, and, pressing against the springs c c, compresses them down into the recesses b b, and as soon as the pressure is removed the springs throw up the gripes into place, seizing the bit by the round par-t above its shank, as shown in Fig. 1. These gripes are constructed as shown in all the figures, more especially in Figs. 3 and 4-viz., a curved shank with a projecting pin at the bottom, which sets in the top of the coiled spring 0, the top provided with aright-angled projecting gib or head with teeth,its center rounded out, as shown in Fig. 2, to receive the bit 0. The shank part of each gripe extends both sides beyond the head proper, as shown at f f, and these sides set in curved ways in the sides of the shank A, part-1y shown at h h, Fig. 2. Their tops also curve over, as shown in Figs. 1 and 4, so that these gripes come closer together as they rise to the top of the shank A. This prevents the drawing out of the bit, as any direct pull on it only tightens it in the brace.

The bit is removed as follows: The outer case, B,has a slot, (1, on each side, near the top, and through this a screw or pin, 6, projects and fastens into the gripe D. By pressing downward with the thumb and forefinger on these screw-heads 0 they slide the gripes D down, which, following the curve of the shank and case outward, release the hold of the gripes on the bit, which can at once be dropped out. The springs 0 0 throw the gripes back into place, as before stated. These gripes and the case and shank A might be made conical to produce the same effect, but would make the brace bigger, and I prefer them rounded, as taking up less space.

All that is required to change a bit is to press down on the screw-heads e e and pull or drop the bit out and push the other bit (larger or smaller) into the central hole, g, Fig. 2, and down into the shank-receptacle a. It is thus held immovable until released.

As a brace or socket for awls, &c., this device will be found equally useful.

I claim- The bit-brace consisting of the shank A, having the bit-receptacle a, the spring-recesses b b, and gripe-slides h it formed therein, the gripes D D, constructed as described and sliding in the ways h h in said shank, the springs 0 c, the outer case, B, having the slots (1 01 therein, and the screws or pins 66, attached to the gripes and projecting through said slots, all constructed, combined, and arranged substantially as and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN WATSON. Witnesses:

J. R. DRAKE, GEO. A. BURNETT.

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