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US Patent: 131,252
Improvement in Pipe-Wrenches
Improvement in Self-Adjusting Pipe Wrenches
Patentee:
John Craig - Detroit, MI

USPTO Classifications:
81/99

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. F. Eberts
H. S. Sprague
Chas. L. Messmore

Patent Dates:
Granted: Sep. 10, 1872

Patent Pictures:
John Craig Pat. September 10, 1872
USPTO pdf tiff
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Description:
The wrench is a swinging hook-jaw self-adjusting pipe wrench with a spring-loaded button in the base of the swinging jaw to push the jaw toward a closed position. The specifications note the shape of the hook jaw and curved face of the fixed jaw would maximize the range of sizes the wrench would accomodate.

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