US Patent: 255,182
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Wrench
Improved Differential Self-Adjusting Wrench
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Patentee:
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| Milton H. McNair (exact or similar names) - Meadville, PA |
| USPTO Classifications: |
| 81/97 |
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Patent Dates:
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| Applied: |
Aug. 24, 1880 |
| Granted: |
Mar. 21, 1882 |
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Patent Pictures:
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Milton H. McNair patent March 21, 1882, with McNair Wrench Co. wrench. |
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Stan Schulz
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Description: |
| The movable jaw is described as a "serrated-faced cam." It is moved by a spring-loaded push button. The spring also keeps the jaw in contact with the work piece. |
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