US Patent: 55,157
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| Improvement in Ratchet-Wrenches
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Patentee:
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| William Pirsson (exact or similar names) - Newark, NJ |
| USPTO Classifications: |
| 81/61 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
May 29, 1866 |
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Patent Pictures:
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William Pirsson Pat. May 29, 1866 |
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Stan Schulz
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Description: |
| The patented feature of this ratchet is a retaining catch which which is can be released by turning in a thumb screw. The catch holds a replaceable head in the ratchet handle. The underlying ratchet is similar to Pirsson's earlier ratchet patent (no. 52444), issued Feb. 6, 1866. |
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