US Patent: 937,966


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US Patent: 937,966

Wrench

Patentee:

Daniel W. Shaffer (exact or similar names) - 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:

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

Patent Pictures:

Daniel W. Shaffer patent October 26, 1909

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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.