US Patent: 476,614 - Adjustable Bit


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US Patent: 476,614

Adjustable Bit

Patentee:

Henry O. Davis (exact or similar names) - Annisquam, MA

USPTO Classifications:

408/194, 408/195, 408/212, 408/213

Tool Categories:

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

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

John J. Davis

Frank E. Smotten

Patent Dates:
Applied:	Dec. 10, 1891
Granted:	Jun. 07, 1892

Patent Pictures:

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Description:

Cutter is set in a dovetailed recess, which Davis acknowledges is very similar to Billing's patent of 1887 (360990). Among the differences are a lever clamping device with a serrated conical projection which secures the clamping plate and cutter.