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US Patent: 558,304
Wrench
Patentee:
John McCarthy Palmer - Marysville, MT

USPTO Classifications:
81/105

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
K. X. Matthews
C. H. Raeder
Joseph Cornell
William Barclay

Patent Dates:
Applied: Sep. 26, 1895
Granted: Apr. 14, 1896

Patent Pictures:
John McCarthy Palmer patent April 14, 1896
USPTO pdf tiff
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Description:
The spring-loaded pivoting block holding the adjusting nut in this pipe wrench is way too elaborate to be practical. The front and back faces of the block are concentric.

Ken Cope's "American Wrench Makers 1830-1930" cites an 1897 POWER item that implies Palmer intended to produce tools based on this patent along with nos. 561,274 and 574,624.

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