US Patent: 21,961 - Die for Cutting Wooden Screws


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US Patent: 21,961

Die for Cutting Wooden Screws

Patentee:

W. O. Hickok (exact or similar names) - Harrisburg, PA

USPTO Classifications:

142/56, 408/200, 408/215, 470/185

Tool Categories:

woodworking tools : hand drills : drill accessories

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Henry Beaden

S. Schriver

Patent Dates:
Granted:	Nov. 02, 1858

Patent Pictures:

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Description:

Claim centers on a "sectional follower thread" just behind the first cutter to advance the work to the second cutter at the proper pitch. Somewhat analogous to the principle of his companion tap for cutting wooden threads (21960).