US Patent: 270,741 - Pipe Wrench


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US Patent: 270,741

Pipe Wrench

Patentee:

Friederich Cajar (exact or similar names) - 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:

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

Patent Pictures:

Friederich Cajar patent January 16, 1883

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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.