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US Patent: 164,075
Pipe-Wrench
Patentee:
Minford S. Clark (exact or similar names) - New York, NY

USPTO Classifications:
81/404

Tool Categories:
wrenches : pipe wrenches : pipe tongs
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. A. Whitney
Wm. Edwards
W. M. Edward

Patent Dates:
Applied: Mar. 26, 1875
Granted: Jun. 08, 1875

Patent Pictures:
Minford S. Clark Pat. June 8, 1875
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Description:
The base for the biting jaw has a threaded ring engaging threads on the shank to provide size adjustment. A spring-loaded slider inside the movable jaw provides resistance to hold the jaw "open" or in engagement with the work piece. The construction which places the fulcrum point of the tongs within the movable base is stronger than any form of pivot bolt or pin.

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