CA Patent: CA-42,296
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PIPE WRENCH
Three-Gripped Self-Adjusting Pipe Wrenches
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Patentee:
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| Gustav 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: |
Apr. 15, 1891 |
| Granted: |
Mar. 14, 1893 |
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Patent Pictures:
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Canadian Patent 42,296 - edited drawing |
CIPO Data
Espacenet patent
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Stan Schulz
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Description: |
| The size and position of the teeth on the three jaw faces is based on a formula such that tooth size increases as pipe diameter increases. The principle is shown applied to "hook jaw" and "pliers" type pipe wrenches. Corresponding U.S. patent 460,230 was granted Sept. 29, 1891. |
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