US Patent: 661,011
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Pipe and Nut Wrench
Involute Wrench
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Patent Dates:
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| Applied: |
Jun. 07, 1900 |
| Granted: |
Oct. 30, 1900 |
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Patent Pictures:
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Maschil D. Converse Pat. Oct. 30, 1900 |
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Description: |
| "A wrench with a rigid arc-shaped fulcrum jaw, and a rigid circumscribing jaw ... the teeth on the circumscribing jaw shall be ranged on a true involute line ... "
The STEEL CITY ELECTRIC CO RED HEAD wrench looks similar, but appears to be based on patent no. 1,896,347. |
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