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US Patent: 1,413,121
Wrench
Patentee:
John Arthur Johnson - Leavenworth, KS

USPTO Classifications:
81/175

Tool Categories:
wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 23, 1921
Granted: Apr. 18, 1922

Patent Pictures:
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Description:
This patent is of note because the inventor was former world heavyweight champion Jack Johnson, the first black man to hold that title.

"My invention relates to improvements in wrenches and has for its object to provide an improved wrench which is of simple and durable construction, reliable in operation and easy and inexpensive to manufacture, which may be easily and readily adjusted and which is adapted to exert a powerful gripping action upon the work.

"Another object is to provide an improved wrench of this character which in assembly presents a substantially unitary structure and which may be easily dissembled for purposes of replacement or repair."

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