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US Patent: 420,867
Wrench
Patentee:
Roy Dodson - St. Louis, MO

USPTO Classifications:
81/116

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Samuel H. Knight
W. E. Knight
Thomas Knight
Edw. S. Knight

Patent Dates:
Applied: May 01, 1889
Granted: Feb. 04, 1890

Patent Pictures:
Roy Dodson patent February 4, 1890
USPTO pdf tiff
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Description:
The hinged jaw or jaws is closed by the wedge action of a tapered tongue on the inner end of the handle against a cam face on the inner end of the jaw(s). A coil spring provides opening force on the jaw(s).

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