US Patent: 633,640
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| Nut and Pipe Wrench
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Patentee:
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| Samuel J. Dern (exact or similar names) - Prairie Depot, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 23, 1897 |
| Granted: |
Sep. 26, 1899 |
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Patent Pictures:
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Samuel J. Dern patent Sept. 26, 1899 |
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Stan Schulz
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Description: |
| Adjustment is held by a pawl engaging two ratchet wheels that connect with rack teeth on the main shank by gear teeth. A thumb lever on the movable jaw can release the pawl, allowing the jaw to move freely. |
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