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US Patent: 20,192
Method of seating the movable cutter in expansive bits
William A. Clark - Bethany, CT

USPTO Classifications:
408/194, 408/195, 408/212, 408/213, D15/139

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


W. A. Clark & Co. - Westville, CT

Thomas P. How
Penelope S. Baine

Patent Dates:
Granted: May 11, 1858

Reissue Information:
Reissued as RE3,516 (Jun. 22, 1869)

Patent Pictures: [ 1 | 2 | 3 ]
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Invention is an expansion auger bit where the movable cutter is held in place by a beveled "key". This design was widely copied by others.

A correspondent reports an example, with "Wm A Clark—Cast Steel Pat May 11 1858 Pat Ext'd" stamped on it.

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