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US Patent: 179,276
Pipe-Wrench
Improvement in Pipe Dogs or Wrenches
Patentee:
George H. Crosby - Somerville, MA

USPTO Classifications:
81/102

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. H. Millett
John S. Holmes
Ewell A. Dick
Jas. C. Wildman

Patent Dates:
Applied: Mar. 25, 1876
Granted: Jun. 27, 1876

Patent Pictures:
George S. Crosby Pat. June 27, 1876
USPTO pdf tiff
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Description:
The adjustable jaw is in a pivoting block, and adjusts by a screw that engages threads inside the shank portion of the movable jaw.

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