US Patent: 377,668
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| Pipe Wrench
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Patentee:
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| John Clark (exact or similar names) - Greenpoint, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 23, 1887 |
| Granted: |
Feb. 07, 1888 |
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Patent Pictures:
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John Clark patent February 7, 1888 |
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Stan Schulz
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Description: |
| The sliding jaw is pulled closed by a coil spring. Sets of holes in the shank and sliding jaw correspond to jaw setting matching common pipe sizes. A tapered pin driven into one of these sets of holes tightens the jaws. |
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