US Patent: 277,590
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| Wrench
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Patentee:
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| Joseph McAlpin (exact or similar names) - San Francisco, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 24, 1883 |
| Granted: |
May 15, 1883 |
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Patent Pictures:
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Joseph McAlpin patent May 15, 1883 |
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Stan Schulz
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Description: |
| The screw adjustment is a ball-shaped nut. The there is also a pivot between the "fixed" jaw and the handle. The pivot allows for the range of motion necessary for a pipe wrench. |
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