USRE8525E - Improvement in bit-stocks - Google Patents

Description

constructions,

UNITED STATES PATENT OEEIoE.

' HENRY L. PRATT, OF BROOKLYN, N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS, TO MILLERS FALLS CO., OF EWING, MASS.

IMPROVEMENT |'N BIT-STOCKS.

Specification forming part of Letters Patent No. 131,829, dated iOctober 1, 1872; Reissue No. 8,525, dated December 17, 1878; application filed November 7, 1878.

.To all whom it may concern:

Be it known that I, HENRY L. PRATT, of Brooklyn, in the county of Kings and State of New York, have invented certain Improvements in Bit-Stocks, of which the following is a full description:

My said improvements consist in the novel combinations, and arrangements of parts which hafe for their object an ecient tool-holder, as hereinafter described.

In the sheet of drawings annexed, Figure 1 is a longitudinal section taken along the line zz, cutting Figs. 2, 3, and 4. Fig. 2 is a transverse section through w w of Fig. 1. Fig. 3 is a transverse section through a' y of Fig. l. Fig. 4 is a transverse section through y y of Fig. 1. Fig. 5 is a perspective view of the screw-button B and the foot-piece C, hereiuat'ter described; and Fig. 6 shows my improvements attached to a brace.

I will now describe my invention.

A represents a socket, which is provided with a slot, of such shape as to receive and admit of the longitudinal-movement of a pair of wedge-shaped jaws, D D, which slot may be enlarged laterally, as shown at g g, to receive the corners ol' the tang of the bits or tool when the same is grasped by the jaws. This socket is provided with inclines at its outer end, and ,at the opposite end is provided with a button, B, which will be described.

The jaws D D are provided with longitudinal grooves to inolose the corners of the tang, as shown clearly in Fig. 1, and they are pivoted together at their smaller ends in such a manner that the jaws will swing open to receive the inserted tang. These jaws are wed geshaped, as already stated, in order that when acted upon by the inclines at'the mouth of the socket theymay be closed together upon the tang. They also rest in a depression in a footpiece, C, which foot-piece has a longitudinal movement in the interior of the socket, and is threaded so as to be actuated bv the rotating button B. This foot-piece and button act together to cause the longitudinal movement of the former, and for that purpose one is provided with a male and the other with a female screw. a cylindrical plug, ttingvin a corresponding cavity in the upper end of the socket A. This cylindrical plug has an annular groove This button B is provided withy extending around it to receive a retainingpin, b, which holds it in :position within the socket A.

By this arrangement no longitudinal movement is permitted to the button B, while at the same time the latter is free to rotate relais given to the threaded foot-piece, and the inclines of the wedgeshaped jaws are moved longitudinally along the inclines in the mouth of the socket, whereby the jaws are made to close upon the shank of the tool and gripe it firmly.

lt is obvious that by reversing the operation the jaws will separate and permit the tool to be readily removed. The jaws D D open automatically, their large ends falling apart into the longitudinal grooves of the socket A.

Having thus described my invention, and disclaiming all devices in which the actuating screw-thread is upon the exterior of the socket within which the jaws are located, I desire to secure by Letters Patent- 1. In a bit-brace, a pair of longitudinallymoving jaws, in combination with a foot-piece located at the inner end of said jaws, and an actuating-button, the foot-piece and button being adapted to impart a longitudinal movement to the jaws by a rotary movement of the button, substantially as described, and for the purpose specified.

2. In a bit-brace, the actuating-button provided with a cylindrical plug having an annular groove, in combinationv with the inner end of the socket, the retaining-pin, and footpiece, adapted to act upon the jaws, substantially as described, and for the purpose specied.

3. In a bit-brace, a socket provided with inclines to close the jaws, an actuating-button, B, a threaded foot-piece, and wedge-shaped companion jaws, substantially as and for the purpose specified.

HENRY L. PRATT. Witnesses:

E. P. STOUGHTON, C. A. AsnMEAD.

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