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US Patent: 237,431
Clamp for Wood Working
Patentee:
Alva M. Colt - Batavia, NY

USPTO Classifications:
269/147, 269/166, 269/232

Tool Categories:
work holding : clamps : hand screws

Assignees:
None

Manufacturer:
Unknown

Witnesses:
James Fox
W. W. Plato

Patent Dates:
Applied: Dec. 17, 1880
Granted: Feb. 08, 1881

Patent Pictures:
USPTO pdf tiff
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Description:
Designed to eliminate slipping of the clamp jaws and utilizes a eccentric lever which operates a plunger to secure the work piece.

Known example marked PAT.FEB.8.81 and the size NO.#3

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