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US Patent: 576,996
Monkey Wrench
Patentee:
Walker R. Bartram (exact or similar names) - Redding, CT

USPTO Classifications:
81/153

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches
wrenches : wrench adjustment types : wedge adjust wrenches

Assignees:
Walker R. Bartram - Redding, CT
Edgar B. Bartram - Bridgeport, CT

Manufacturer:
Not known to have been produced

Witnesses:
M. L. Longden
J. S. French
Charles K. Shelton
John N. Nickerson
Patent Dates:
Applied: Jun. 26, 1896
Granted: Feb. 16, 1897

Patent Pictures:
Walker R. Bartram patent February 16, 1897
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Description:
A tapered binding roller within the movable jaw holds the adjustment. A spring pushes the roller into wedging position.

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