US Patent: 1,355,470
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| Pipe Wrench
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Patentee:
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| James H. Hall (exact or similar names) - Rupert, ID |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 06, 1920 |
| Granted: |
Oct. 12, 1920 |
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Patent Pictures:
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James H. Hall patent October 12, 1920 |
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Stan Schulz
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Description: |
| The two sides of the wrench are hinged at the end of the handle. Both jaw faces have teeth to grip pipe. One jaw face slides on a series of ball bearings, and is drawn back by a compression spring. The width of the opening is adjusted by a spring-loaded toothed lever that engages a transverse rack. |
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