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US Patent: 633,578
Monkey Wrench
Patentee:
Richard F. Downey - Menominee, Menominee County, MI

USPTO Classifications:
81/126

Tool Categories:
wrenches : nut wrenches
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
Richard F. Downey - Menominee, Menominee County, MI
Matthews A. Burns - Menominee, Menominee County, MI
Frank Gregory - Menominee, Menominee County, MI

Manufacturer:
Not known to have been produced

Witnesses:
E. S. Wheeler
M. A. Martin
O. B. Baenziger

Patent Dates:
Applied: Oct. 10, 1898
Granted: Sep. 26, 1899

Patent Pictures:
Richard F. Downey patent Sept. 26, 1899
USPTO pdf tiff
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Description:
The hinged handle acts as a cam to slide the adjusting nut and its base tighter against a nut. The internal pin and spring return the handle to the "straight" position when pressure is released.

R. B. Wheeler & Co. - patent attorneys

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