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US Patent: 397,988
Thumb Nut Wrench
Patentee:
Charles W. Kimball - Chicago, IL

USPTO Classifications:
411/435, 411/918

Tool Categories:
wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Chas. E. Gaylord
L. M. Freeman
L. B. Coupland

Patent Dates:
Applied: Jun. 05, 1888
Granted: Feb. 19, 1889

Patent Pictures:
Charles W. Kimball patent February 19, 1889
USPTO pdf tiff
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Description:
A large-proportioned wing nut form with a slot for insertion of a square nut. If constructed as shown in the drawing, this would end up being "locked into place" by the nut it manipulates.

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