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US Patent: 260,497
Auger
Improvements in Expansion-Bits
Patentee:
William L. Parmelee (exact or similar names) - New Haven, CT

USPTO Classifications:
408/152, 408/181

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

Assignees:
Derby Bit Co. - New Haven, CT

Manufacturer:
Not known to have been produced

Witnesses:
Venenue Munger
Dan Bartholomew
Harry Bernhard
F. H. Knight
Patent Dates:
Applied: Apr. 20, 1882
Granted: Jul. 04, 1882

Patent Pictures:
William L. Parmelee patent July 4, 1882
USPTO (New site tip)
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Description:
The size adjustment on this expansion wood bit is a rack on the moving cutter, adjusted by a worm in the head of the bit.

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