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US Patent: 377,668
Pipe Wrench
John Clark - Greenpoint, NY

USPTO Classifications:
81/109, 81/129

Tool Categories:
wrenches : pipe wrenches

John Clark - Greenpoint, NY
Michael Gilmartin - Greenpoint, NY

Not known to have been produced

A. Faber du Faur, Jr.
William Miller
W. C. Hauff

Patent Dates:
Applied: Jun. 23, 1887
Granted: Feb. 07, 1888

Patent Pictures:
John Clark patent February 7, 1888
USPTO pdf tiff
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The sliding jaw is pulled closed by a coil spring. Sets of holes in the shank and sliding jaw correspond to jaw setting matching common pipe sizes. A tapered pin driven into one of these sets of holes tightens the jaws.

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