US Patent: 379,123
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| Pipe Wrench
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Patent Dates:
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| Applied: |
Feb. 15, 1887 |
| Granted: |
Mar. 06, 1888 |
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Patent Pictures:
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Hormer Parmelee patent March 6, 1888 |
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Description: |
| The grip is three arcs of a circle. One end is clipped to the handle by a pin and spring; the other end is caught by a cam on the handle to tighten the grip as the handle is swung.
Subsequent improvements and refinements were covered by patent nos. 590,853, 648,706, and 871,436. |
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