US228811A - aoodell - Google Patents

Description

' (No Model.)

A. D. G OODELL. Bit-Brace.

N5. 228,8. Patented June 15,1880.

N. PETERS, PNOTO-LITHOGRAFHER. WASHINGTON. BYC.

UNITED STATES PATENT OFFICE.

ALBERT D. GOODELL, OF MILLERS FALLS, MASSACHUSETTS, ASSIGNOR TO MILLERS FALLS COMPANY, OF SAME PLACE.

BIT-BRAC E.

SPECIFICATION forming part of Letters Patent No. 228,811, dated June 15, 1880.

Application filed March 5, 1880.

To all whom it may concern Be it known that I, ALBERT D. GooDELL, of Millers Falls, in the county of Franklin and Commonwealth of Massachusetts, have invented a new and useful Improvement in Bit- Braces, of which the following is a true and full specificatiom My invention relates to that class of the cheaper bit-braces where the bit is confined To in the socket by a screw through the side of the socket, and usually setting against the side of the shank of the bit, which is squarefaced and of iron. Every one who has used one of-these braces knows that the tapering shank of the bit is very insecurely held.be-

tween the end of the thumb-screw, which is commonly rounded, and the side of the socket that it wabbles and works loose, and hardly ever has hold enough to enable one to with- 2c draw the bit with the brace after a hole is bored.

My invention in a very simple manner remedies this and makes the cheap brace very much more serviceable.

2 5 The accompanying drawings illustrate my invention, Figure 1 of which shows an elevation of brace with head in section; Fig. 2, a

' section on line 00 a, Fig. 1.

The screw B, which is intended to hold the 0 bit in place, is made of hardened steel, having cut on it a pretty deep thread to give a strong hold in the side of the socket, and the end of the screw, a, which bears against the bit, is

(No model.)

made concave or cup-shaped, as shown in the drawings by b. This screw, instead of entering the socket A to bear against the flat side of the shank, as is commonly done, is made to enter the socket so as bear directly on a corner of the bit, and on turning it up the edge of the cup-shaped end embraces one of the an 40 gles of the bit-shank, and impinges upon said bit-shank with its annular edge, to hold it firml y in its socket, so that it cannot be withdrawn until said screw is released. Moreover, the bit, being pressed cornerwise by the screw, 5 is forced diagonally against the opposite corner of the socket, and consequently against the two sides 0 d, forming the corner, and is therefore held a great deal more firmly than if pressed merely against one side alone, and is almost as secure as if centered. This screw may also be usefully applied to holding drills, screw-drivers, and other tools and implements.

What I claim is In a bit-brace, the screw B, provided with a countersunk en'd, forming an annular cuttingedge, in combination with stock A and the auger-bit, said screw being adapted to enter the said stock at right angles to its axis, and impinge upon the angle of the bit at the base of said bit-shank, as specified.

A. D. GOODELL.

Witnesses J AMES S. GRINNELL, FRANCIS M. THOMPSON.

Images