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US Patent: 220,076
Wrench
Improved Universal Wrench
Patentee:
Andrew Jackson - San Francisco, CA

USPTO Classifications:
81/170, 81/93

Tool Categories:
wrenches

Assignees:
Andrew Jackson - San Francisco, CA
John J. Dunn - San Francisco, CA

Manufacturer:
Not known to have been produced

Witnesses:
Frank A. Brooks
Geo. H. Strong
S. H. Nourse

Patent Dates:
Applied: Jun. 21, 1879
Granted: Sep. 30, 1879

Patent Pictures:
Andrew Jackson patent September 30, 1879
USPTO pdf tiff
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Description:
The unusual jaw shapes, tension spring attachment to the movable jaw, and location of the adjustment means make this a unique design. The jaw shapes would allow this to grip pipe and a variety of polygonal shaped nuts.

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