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US Patent: 871,436
Pipe Wrench
Patentee:
Roy Parmelee - Chicago, IL

USPTO Classifications:
81/90.5

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
Parmelee Wrench Company - Chicago, IL

Manufacturer:
Walworth Mfg. Co. - Boston, MA
Parmelee Wrench Company - Chicago, IL

Witnesses:
Louis B. Erwin
Edw. R. Barrett
S. E. Hibben

Patent Dates:
Applied: Sep. 21, 1905
Granted: Nov. 19, 1907

Patent Pictures: [ 1 | 2 ]
Roy Parmelee patent November 19, 1907
USPTO pdf tiff
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Description:
The fourth patent for the PARMELEE GIRTH GRIP non-marring pipe wrench. The patent is an improvement on pat. no. 648,706, with a focus on the means of latching the girth to the handle. The sliding latch is advanced or retracted by a rotating collar with a slot or abutment that is a segment of a spiral.

In the production wrench citing this patent, the slide advancing mechanism is a nut threaded on the outside of the handle shaft.

The Parmelee Wrench Company was a "closed corporation" incorporated by the family in 1905. WALWORTH took over production some time in 1914. Parmelee wrench production has at times operated as a separate company and at times as a division of a larger firm; Parmelee wrenches are still in production early in the 21st Century.

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