US Patent: 159,420 - Pipe And Nut Wrench


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US Patent: 159,420

Pipe And Nut Wrench

Patentee:

Friedrich Kohler (exact or similar names) - Allegheny, PA

USPTO Classifications:

81/127, 81/178

Tool Categories:

wrenches : wrench adjustment types : self-adjust wrenches

wrenches : pipe and nut combination wrenches

combination tools

Assignees:

Friedrich Kohler - Allegheny, PA

Henry Zimmerman - Allegheny, PA

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Aug. 04, 1874
Granted:	Feb. 02, 1875

Patent Pictures:

Friedrich Kohler Pat. February 2, 1875

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Pat No. 159,420 patent model (Hagley Museum)

Description:

The wrench has a "conventional" self-adjusting feature with a reversible jaw element with flat and curved toothed jaw faces. The sharp edge of the curved jaw will mate with the flat "corner" of the opposing jaw to provide a nail-pulling grip.

The patent model is in the collection at the Hagley Museum (Wilmington, DE).