US Patent: 1,000,878
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| Wrench
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Patentee:
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| Fred R. Allen (exact or similar names) - Providence, RI |
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Patent Dates:
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| Applied: |
Dec. 20, 1910 |
| Granted: |
Aug. 15, 1911 |
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Patent Pictures:
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Fred R. Allen patent August 15, 1911 |
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Stan Schulz
ALLEN FRICTION WRENCH (FLICKR)
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Description: |
| The binding action of the cam-shaped end of the handle transfers motion to the driving head.
Produced as the ALLEN FRICTION WRENCH, and sold as the "ratchet" driver for socket sets.
A 1915 modification (pat. no. 1,124,191) adapts the principle to a ratchet drill. |
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