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US Patent: 382,975
Wrench
Patentee:
Benjamin R. Hagar - Bradford, PA

USPTO Classifications:
81/110, 81/144, 81/178, 81/185.1

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
K. Saulnier
M. A. Todd
T. A. Sangster
J. W. Willis

Patent Dates:
Applied: Jan. 30, 1888
Granted: May 15, 1888

Patent Pictures:
Benjamin R. Hagar patent May 15, 1888
USPTO pdf tiff
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Description:
The movable jaw is held in adjustment by a cam-shaped toothed piece clamped against the shank by a set screw. The rounded face allows for sufficient movement so the pipe does not "lock" in the jaws. The gripping face in the movable jaw has an insert with three sets of teeth.

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