US78652A - Improvement in braces foe bits - Google Patents

Description

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J'HN W.'GRAIG,0F 'KNOXV'ILLE ILLINOIS Letters Patent No. 78,652, dated June 9, 1868.

IMPROVEMENT IN BRAOES FOR BITS.

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To ALL WHoM IT MAY ooncnnn:

Be it known that I, JOHN IV. CRAIG, of Knoxville, in the county of Knox, and State of Illinois, have invented :t new and improved Device for Holding Bits in Braces; and I-do hereby declare that the following is n. full, clear, and exact description thereof, which will enable those skilled in the art to make anduse the same,

:reference being had to the accompanying drawings, forming-partof this specification.

vThis .invention'relates to the manner in which boring-purposes.l

And it consists in a fastening-lever and a spring-catch, applied to the brace, and arranged in- @he manner hereinafter described.

Figure 1 represents a section ofthe brace, with a back viewof the fastening-lever and spring-catch.

Figure 2, a-sectional side view of the same, the section being through the line :v :z: of 5g. 1.`

Similar letters of reference indicate corresponding parts. i

A represents-the brace.

B is the bit.

:C is the fastening-lever.

D is the springscatch, which holds the lever C in'place when the bit is fastened.

The brace is slotted or recessed out on one side suiioientl in the drawing.

The lever is hung or jointed to thebrace by a pin, at a, and, 'on its inner side, toe, b, which tits into a corresponding recess in theshank ot' tb ing, with the bit fastened.

When in this position, the lever is held in place by the springcatch This spring is a plate, through which the bit passes, and it is fastened to the end ofthe brace by the screws seen at d.

The out'er end ot this spring forms a thumb-piece, f, which is raised by the thumb when the bit is liberatediV c represents a spring, which is attached to the brace, and which bears against the fastening-lever with a auger-bits and other kinds of bits are held in braces for it` has a projecting lip or e bit, when it stands, as represented in the drawconstant pressure, 'when the bit is fastened as seen'.

When the spring-catch D is raised, the lcver is thrown back 'by the tension of the spring e, and then the lever acts with a short purchase. to raise the bit from its socket, thus preventing all trouble, 'in consequence of the sticking of the bit, as is commonK with the ordinary brace. i' v By this arrangement, the bit is firml with the greatest ease. I

Having thus described my-invention, I claim as new, and desire to secure by Letters Patent- The device for holding bits in braces, consisting of the pivoted spring-lever C, formed with the toe b, whichengages with the bit,"the free end ot' said lever adapted to catch under the spring-catch D, secured upon the' end of the brace, and provided with a round hole for the passage of the bit, all constructed and arranged to operate as herein shown and described.

y held in its socket at all times when in use, and liberated therefrom JOHN W. CRAIG.

Witnesses:

F. G; SANBURN, LYM'ANA. JAoxsoN,

y to admit the lower portion of the lever, as seen

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