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US Patent: 2,161,163
Tool having identification insignia
Patentee:
Theron L. Hedgpeth - Oak Park, IL

USPTO Classifications:
40/629, 40/913, 76/114, 81/119, 81/125.1, 81/52, 81/DIG.5, D8/21

Tool Categories:
wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 27, 1937
Granted: Jun. 06, 1939

Patent Pictures:
USPTO pdf tiff
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Description:
This invention constitutes a method of marking wrenches so that they can be marked with the owner's mark, and that mark cannot easily be altered; if altered, the alteration can easily be detected. The wrench is provided with a space for marking that includes a central raised rib. A "marking means" is provided—a press and dies—that accomodate the marking space with its raised rib. Once the tool is marked, the mark cannot easily be removed with a bench grinder because the space for the mark is nested with the ribs of the handle. If a means is found to remove the mark, it will be very difficult to do so without also removing the rib within the mark, which makes the defacing very obvious.

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