US Patent: 639,785
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| Pipe Wrench
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Patentee:
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| John C. Speirs (exact or similar names) - Worcester, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 14, 1898 |
| Granted: |
Dec. 26, 1899 |
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Patent Pictures:
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John C. Speirs patent Dec. 26, 1899 |
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Stan Schulz
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Description: |
| Rocking movement of the movable jaw to prevent "locking" on the pipe is made possible by the curved surface of the "nut" in the base of the movable jaw, and a spring which tips the movable jaw away from the shank.
Compare this to Edward Wright's June 30, 1896 patent no. 562,878. |
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