US Patent: 1,413,121
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| Wrench
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Patentee:
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| John Arthur Johnson (exact or similar names) - Leavenworth, KS |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 23, 1921 |
| Granted: |
Apr. 18, 1922 |
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Patent Pictures:
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John Arthur Johnson patent April 18, 1922 |
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Stan Schulz
Jack Johnson's patents (pdf)
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Description: |
| Turning the end of the handle adjusts the jaw opening; the effective length of the handle lengthens as the jaws open.
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 disassembled for purposes of replacement or repair."
Munn & Co., attorneys |
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