US Patent: 226,490
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| Wrench
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Patent Dates:
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| Applied: |
Jan. 31, 1880 |
| Granted: |
Apr. 13, 1880 |
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Patent Pictures:
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Joseph W. Calef patent April 13, 1880 |
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Description: |
| This self-adjusting wrench operates by gear-teeth on the inner end of the swinging handle engaging rack teeth on the back side of the movable jaw.
The U.S. patent was preceded by Canadian patent CA-10,613 issued Nov. 5, 1879.
This patent along with Calef's March 3, 1883 patent (no. 273,461) was used in P. Lowentraut's SAMSON self-adjusting wrench.
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