US Patent: 1,293,734
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| Pipe Wrench
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Patent Dates:
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| Applied: |
Sep. 27, 1918 |
| Granted: |
Feb. 11, 1919 |
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Patent Pictures:
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William S. Du Charme Pat. February 11, 1919 |
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Description: |
| The wrench has an alligator-jaw type action with teeth on the fixed jaw, and a smooth surface on the movable jaw. The movable jaw is held by rack teeth on the back of the main bar and a compression spring inside the jaw.
An ad in the Febr. 15, 1921 PLUMBER'S TRADE JOURNAL notes five sizes in production. |
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