US Patent: 460,230
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| Three Gripped Self Adjusting Pipe Wrench
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Patentee:
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| Gustaf Gunnarson (exact or similar names) - San Francisco, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 18, 1890 |
| Granted: |
Sep. 29, 1891 |
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Patent Pictures:
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Gustaf Gunnarson patent September 29, 1891 |
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Stan Schulz
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Description: |
| The patent describes the design considerations that dictate the jaw shape and position of the pivot. As noted by the title, one of the design considerations is that the jaws grip pipe at three places. The results are shown both as a swinging "self-adjusting" hook jaw, and as a "pliers / tongs" pipe wrench.
Corresponding Canadian patent no. CA-42,296 was issued March 14, 1893. |
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