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US Patent: 502,997
Monkey Wrench
Patentee:
Edwin Sylvester Pratt (exact or similar names) - Parry Sound, ON Canada

USPTO Classifications:
81/137, 81/138, 81/158

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. G. McMillan
J. E. Cameron
H. Armstrong
M. E. McCurry

Patent Dates:
Applied: Mar. 23, 1893
Granted: Aug. 08, 1893

Patent Pictures:
Edwin S. Pratt patent August 8, 1893
USPTO (New site tip)
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Description:
The adjusting nut is mounted on a pivoting plate, so that it can be moved into and out of engagement with the rack threads on the main shank.

Canadian patent CA-43,855 issued August 7, 1893 and British patent GB-189313389 registered July 10, 1893 are parallel patents for the same design.

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