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US Patent: 2,441,144
Wrench Provided With Cam-Actuated Self-Tightening Jaws
Patentee:
Roy L. Gregory - Everett, WA

USPTO Classifications:
81/186, 81/90.2, D8/23

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

Assignees:
None

Manufacturer:
Unknown

Witnesses:
none listed

Patent Dates:
Applied: May 29, 1945
Granted: May 11, 1948

Patent Pictures:
Roy L. Gregory patent May 11, 1948
USPTO pdf tiff
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Description:
The action can be seen by looking at the drawings. A known example marked GREGORY DESHANE MFG. CO. PAT. PEND. does not have the interchangeable jaw surfaces, and the "tail" on which the handle cam bears is blunt rather than tapered.

The specifications cite one French patent and U.S. patent nos. 294,642, 496,753, 657,391, 899,197, 1,215,640, 1,361,923, and 1,845,400 as relevant prior art.

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