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CA Patent: CA-41,791
Screw Wrench
Patentee:
William C. Riesberry (exact or similar names) - Carberry, MB Canada

USPTO Classifications:

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John Grist
H. H. Horsey

Patent Dates:
Applied: Nov. 23, 1892
Granted: Feb. 02, 1893

Patent Pictures:
William C. Riesberry patent February 2, 1893
CIPO Data
Report data errors or omissions to steward Stan Schulz
Search Canadian Patents 1869-1894
41,791 in Canadian Patents Database
Description:
The wrench is capable of ratchet action, by virtue of the hinge and spring on the shank of the "fixed" jaw. The jaws are shown smooth for nuts, or with teeth to grip pipe.

U.S. patent 491,721 (February 14, 1893) is a parallel patent for the same design.

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