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US Patent: 376,991
Wrench
Patentee:
Henry P. Roberts - Jamestown, NY

USPTO Classifications:
81/92

Tool Categories:
wrenches : pipe and nut combination wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Chas. E. Thomas
T. W. Fowler
Thos. Wellman
James I. Parson

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

Patent Pictures:
Henry P. Roberts patent January 24, 1888
USPTO pdf tiff
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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.

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