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US Patent: 639,640
Wrench
Improvements in Pipe-Wrenches
Patentee:
Morgan Williams - Aspen, CO

USPTO Classifications:
81/107, 81/176

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. T. Morrow
F. H. Stockman
Grafton L. McGill
Jno. Imirie

Patent Dates:
Applied: May 27, 1899
Granted: Dec. 19, 1899

Patent Pictures:
Morgan Williams patent Dec. 19, 1899
USPTO pdf tiff
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Description:
The unique feature is the adjusting frame within the "keyhole" shaped frame at the end of the outer jaw. The structure limits the distance the jaws can open. The gripping teeth run diagonally.

Cited as a reference in patent no. 2,444,135.

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