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US Patent: 270,741
Pipe Wrench
Patentee:
Friederich Cajar - New York, NY

USPTO Classifications:
81/102, 81/127, 81/186

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
O. H. Beyer
Oscar F. Gunz
Edgar Tate

Patent Dates:
Applied: Dec. 01, 1882
Granted: Jan. 16, 1883

Patent Pictures:
Friederich Cajar patent January 16, 1883
USPTO pdf tiff
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Description:
The teeth on the handle move the the adjustable jaw as the handle is swung. The patent includes the slip-on jaw cover to enable the wrench to work with nuts as well as pipe. There is also a provision to use a locking pin to limit the range of movement, thereby adjusting the tool to a limited size range.

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