US366826A - Cromer - Google Patents

Description

(No Moder.

G. GAVIN & L. W. OROMER.

BIT BRAOE.

No. 366,826. Patented July 19, 1887.

WITNESSES INVBNTOR i w offiwmu BY u Q ATTGRNEYS.

UNITED STATES PATENT OEEicE.

GEORGE GAVIN AND LZUVRENGE VASHINGTON CROMER, OF EUREKA,

NEVADA.

BlT-BRAC E.

SPEQIFICATION forming part of Letters Patent No. 366,826, dated July 19, 1887. Application filed July '21, 1886. Serial No. 209,021. (No model.)

To rtZZ whom, it may concern.-

Be it known that we, GEORGE GAVIN and LAWRENCE WAsnINe'roN CROMER, of En reka, in the county of Eureka and State of Nevada, have invented a new and Improved Bit-Brace, of which the following is a full, clear, and exact description.

Our invention consists in the construction and arrangement of parts, as will be hereinafter fully described and claimed.

Reference is to be hadto the accompanying drawings, forminga part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a front elevation of our bit-stock as applied to a ratchet-brace, with the bit locked in position by the sliding bolts Fig. 2 is ahorizontal section thereof, and Fig. 3 a vertical transverse section of the same. Fig. 4 is a front elevation of our bitstock as used with the ordinary brace.

A represents a portion of a brace, and B a bit-stock, usually made cylindrical in form and secured to the brace in the ordinary manner. At the lower end, upon'one side of the bitstock B and extending through the socket thereof, is cut a T-shaped slot, (),the vertical portion of which extends through the lower edge ofthe bit-stocl;,dividing the same.

The socket of the bit-stock is provided with a cylindrical bore adapted to receive a similar cylindrieally-shaped bitshank, D, provided above the shoulder thereof with a pin, a, which when the bit-shank is in position within the socket of the bit-stock engages either end, as desired, of the horizontal arm of the T- slot 0.

A vertical groove, 1), is cut in the face of the bit-stock B from a distance above the T- shaped slot 0, merging into its horizontal arm opposite the vertical arm of said slot O, the width of the groove 1) being greater than that of the said T-shaped slot. Into the groove b thus formed a bolt, E, provided with a central slot, 6, and an upper thumb-hold, e, is adapted to slide down to a position against the under side of the horizontal arm of the slot 0, dividing the said arm and retaining the pin (6 of the bit-shank D in one of the divisions thus formed, as shown in Fig. 1. The

bolt E is securely held in position by a set screw, d,whieh enters the slote therein, and is screwed down to a bearing upon the sides of the said slot into the bitstock B. The pin a is thus held securely in either division of the horizontal arm of the T-slot O, and as the bolt E forms a cap for the verticalarm ot' the said slot the pin a cannot enter therein until the bolt E is slid to its upward position, which is in line with the upper side of the horizontal arm of the said slot 0.

It is only necessary to employ the bolt E when the bit-stock is attached to a ratchet brace. The pin a is then bolted thereby, as described, in either the right or left division of the horizontal arm of the T-shaped slot 0, to accommodate the desired movement of the ratchet.

The bit-stock is complete without the sliding bolt E for use with ordinary braces, as in boring a hole, for instance, the pin a of the bit-shank D,which is entered through the vertical arm of the slot 0, will bear against the left-hand end of the horizontal arm thereof, and as the motion of the brace is reversed to withdraw the anger the pin finds its bearing against the opposite or right-hand end of the said horizontal arm ofthe said slot. Therefore in this connection a lock is not needed.

The construction of our bit-stock, also that of the bit-shank, is most simple in every particular, and does not contain a single element liable to displacement or breakage, and to gether they operate in as perfect manner as any socket or hit heretofore used, while the cost of construction is reduced to a minimum figure.

The operation is briefly as follows: Vhen an ordinary brace is employed, the bit shank is mounted into the socket of the bitstoek, the pin or stop a thereon passing up through the vertical arm of the T-slot G to engagement with either end of its horizontal arm, as requiredfor example, to drive a screw upon the left to withdrawit upon the right. Vhen employed with a ratchet-brace, the additional operation is had of sliding the boltE down to its bearing upon the under side of the horizontal arm of the slot 0, in order to lock the pin a of the bit-shank D in either the right or ICO left division of the T-shaped slot 0, as the nature of the work may demand. We do not limit the application of our invention to hitstocks and bits, as shown, as the same maybe 5 otherwise applied-as, for instance, to angers and auger-handles.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is 1o 1. The combinatiomwith the bit-stock having a Vertical bit-socket, and an angular slot leading from the end of the stock and communicating with its socket, of aslottecl verticallysliding bolt adapted to slide over the vertical '15 arm of said slot to close the same andpro- GEORGE olvni. laAwRENCE WASHINGTON CROMER.

Witnesses: A. A. ANDRE,

J. A. LAWRENCE.

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