US Patent: 491,721
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| Wrench
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Patentee:
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| William C. Riesberry (exact or similar names) - Carberry, MB Canada |
| USPTO Classifications: |
| 81/99 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 28, 1892 |
| Granted: |
Feb. 14, 1893 |
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Patent Pictures:
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William C. Riesberry patent February 14, 1893 |
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Stan Schulz
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Description: |
| The end of the "fixed" jaw is hinged, and held in line by a spring. This allows for "ratchet" action on nut, or gripping and releasing action on pipe when the jaw faces have teeth.
Canadian patent CA-41,791 (February 2, 1893) is parallel for the same design. |
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