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US Patent: 937,966
Wrench
Patentee:
Daniel W. Shaffer - Chattanooga, OK

USPTO Classifications:
81/170

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
D. W. Shaffer - Chattanooga, OK

Witnesses:
J. C. Simpson
F. O. Pasher
M. J. Thompson
Hugh Mossman

Patent Dates:
Applied: Feb. 23, 1909
Granted: Oct. 26, 1909

Patent Pictures:
Daniel W. Shaffer patent October 26, 1909
USPTO pdf tiff
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Description:
Combination pipe and nut wrench with a central adjusting screw in a hollow handle, and parallel guide rods sliding in tubes alongside the handle. One or both ends of the adjusting screw may have a perpendicular rod handle to facilitate tightening the grip of the adjustable jaw.

Similar to the January 3, 1922 Bonnell Sure Grip (patent no. 1,401,956) from Chickasha, Okla.

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