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US Patent: 143,908
Pipe-Wrenches
Improved Pipe-Wrench
Patentee:
David D. Ingram - Manistee, MI

USPTO Classifications:
81/98

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. J. Sprague
Chas. E. Huestis
H. F. Eberts

Patent Dates:
Applied: Jul. 08, 1873
Granted: Oct. 21, 1873

Patent Pictures:
David D. Ingram Pat. Oct. 21, 1873
USPTO pdf tiff
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Description:
A pivoting toothed cam in the "fixed" jaw creates the wedging action needed to turn pipe. The specifications note the pipe wrench could be combined with a "traditional" nut wrench on the opposite side of the shank.

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