US Patent: 638,474
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| Wrench
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Patentee:
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| Edgar C. Rollins (exact or similar names) - Harvey, TX |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 20, 1899 |
| Granted: |
Dec. 05, 1899 |
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Patent Pictures:
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Edgar C. Rollins patent Dec. 5, 1899 |
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Stan Schulz
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Description: |
| Size adjustment is determined by the position of a tooth on the inner face of the movable jaw in relation to rack teeth on the main shank. One function of the loop and rocker cam is to serve as a grip lock when the jaws are engaged with a nut or pipe. |
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