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US Patent: 277,590
Wrench
Patentee:
Joseph McAlpin - San Francisco, CA

USPTO Classifications:
30/102, 81/126, 81/182

Tool Categories:
wrenches : pipe and nut combination wrenches

Assignees:
Joseph McAlpin - San Francisco, CA
Robert G. Adair - San Francisco, CA

Manufacturer:
Not known to have been produced

Witnesses:
Geo. H. Strong
J. H. Nourse
J. H. Blood
Wm. F. Booth

Patent Dates:
Applied: Feb. 24, 1883
Granted: May 15, 1883

Patent Pictures:
Joseph McAlpin patent May 15, 1883
USPTO pdf tiff
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Description:
The screw adjustment is a ball-shaped nut. The there is also a pivot between the "fixed" jaw and the handle. The pivot allows for the range of motion necessary for a pipe wrench.

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