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US Patent: 923,665
Wrench
Patentee:
James E. La Dow - Kellogg, IA

USPTO Classifications:
81/91.2

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

Assignees:
None

Manufacturer:
Marshalltown Drop Forge Company - Marshalltown, IA

Witnesses:
J. A. Brophy
Anson E. Clay
H. R. McMahon
John K. Brachvogd

Patent Dates:
Applied: Oct. 03, 1908
Granted: Jun. 01, 1909

Patent Pictures:
James E. La Dow patent June 1, 1909
USPTO pdf tiff
Google Patents
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Description:
A parallelogram type linkage opens and closes a hook jaw that lies approximately parallel to the handle. The action is self-adjusting.

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