US Patent: 610,450
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| Pipe Wrench
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Patentee:
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| David C. Johnston (exact or similar names) - Marietta, OH |
| USPTO Classifications: |
| 81/98 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 26, 1898 |
| Granted: |
Sep. 06, 1898 |
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Patent Pictures:
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David C. Johnston patent September 6, 1898 |
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Stan Schulz
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Description: |
| Swinging hook jaw pipe wrench with a single "tooth" and with curved structure conforming to the exterior of pipe. The swinging section of the "hook" has a taper edge which slides past a matching face on the main shank. The effect of this is to tighten the grip the harder the pull on the handle. |
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