US Patent: 97,166 - Improvement in Extension Bit


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US Patent: 97,166

Improvement in Extension Bit

Patentee:

H. P. Chapman (exact or similar names) - Essex, CT

USPTO Classifications:

408/195

Tool Categories:

woodworking tools : hand drills : drill bits : adjustable drill bits

Assignees:

Centre Brook Manufacturing Co. - Centre Brook, CT

Manufacturer:

Centre Brook Manufacturing Co. - Centre Brook, CT

Witnesses:

J. H. Shumway

A. J. Tibbits

Patent Dates:
Granted:	Nov. 23, 1869

Patent Pictures:

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Description:

Slot with inclined edges to receive a conical headed set screw in the adjustable cutter. The fixed cutter below the adjustable cutter has a gouge lipped shape to allow chips to be thrown either to the front or rear of the adjustable cutter.

Chapman references Ives' patent of Oct 13, 1868, 82,956 and Clark's patent of May 11, 1858, 20,192, reissued Jun 22, 1868, RE3,516