US Patent: 1,306,794
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| Wrench
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Patentee:
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| Allen C. Allan (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Mar. 27, 1919 |
| Granted: |
Jun. 17, 1919 |
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Patent Pictures:
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Allen C. Allan patent June 17, 1919 |
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Stan Schulz
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Description: |
| The patent combines "slip joint" adjustment of a fulcrum and cam engagement with a movable jaw as embodied in a "self-adjusting open end wrench" or "cam-lever plier wrench."
The ALLAN PLIER WRENCH described in a March 1, 1920 write-up matches this patent.
1920 write-ups for the Allan-Deffenbaugh Automatic Track Wrench and Allan-Diffenbaugh Wrench show a cam-adjusting self-adjust wrench similar to the "self-adjusting open end wrench" aspect of this design -- the major differences for the open end wrench being a single fulcrum point rather than a slip-joint, and a single handle.
Allan's previous patent 1,198,309 appears to have been a predecessor to the self-adjusting aspect of this wrench. |
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