US Patent: 376,991


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US Patent: 376,991

Wrench

Patentee:

Henry P. Roberts (exact or similar names) - Jamestown, NY

USPTO Classifications:

81/92

Tool Categories:

wrenches : pipe and nut combination wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	May 27, 1887
Granted:	Jan. 24, 1888

Patent Pictures:

Henry P. Roberts patent January 24, 1888

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Description:

Combination nut and pipe wrench. The adjusting nut works on the threaded main shank. The novelty is the rocking double-faced movable jaw, with a spring between the jaw and base collar to provide the range of motion necessary for the pipe gripping side.