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US Patent: 597,743
Wrench
Patentees:
Stephen D. Robinson (exact or similar names) - Farmingdale, SD
Bennie M. Doud (exact or similar names) - Farmingdale, SD

USPTO Classifications:
81/382, 81/386

Tool Categories:
wrenches : pipe wrenches
wrenches : pliers type wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Victor J. Evans
W. S. Van Loon
Albert Kirkpatrick
Robert Lee Platt

Patent Dates:
Applied: Jul. 12, 1897
Granted: Jan. 25, 1898

Patent Pictures:
Stephen D. Robinson and Bennie M. Doud patent January 25, 1898
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Description:
The main parts are formed of "U" shaped stampings. The pivot point for the movable jaw is adjustable to expand the range of sizes the wrench can handle.

The lever handle operating the jaw compounds the gripping force applied by the jaws.

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