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US Patent: 304,807
Wrench
Patentee:
Benton Elmore (exact or similar names) - Etna, CA

USPTO Classifications:
81/126

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. H. Nourse
Geo. H. Strong
Hans Pedersen
S. Farrington

Patent Dates:
Applied: May 08, 1884
Granted: Sep. 09, 1884

Patent Pictures:
Benton Elmore patent September 9, 1884
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Description:
Swinging the jaws at an angle to the handle allows them to be adjusted; as they align with the handle they tighten. The grip is sufficient to grab pipe with the toothed faces of the jaws.

Although the available drawings differ, this design appears to have received Canadian patent CA-22,664 Oct. 21, 1885.

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