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US Patent: 141,324
Improvement in Expansive Bits
Patentee:
William A. Clark (exact or similar names) - New Haven, CT

USPTO Classifications:
408/195, 408/212

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

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Phil. T. Dodge
J. McKenney

Patent Dates:
Applied: Dec. 05, 1872
Granted: Jul. 29, 1873

Patent Pictures: [ 1 | 2 ]
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Description:
Described as an improvement on his earlier expansive bit patent of 1858 (20192), and its latest reissue of 1871 (RE4668), this patent focuses on the way in which the adjustable cutter is recessed into the body of the bit in conjunction with a separate clamping plate.

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