US Patent: 642,155
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| Wrench
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 05, 1899 |
| Granted: |
Jan. 30, 1900 |
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Patent Pictures:
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George Redford and Edwin Campbell patent Jan. 30, 1900 |
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Stan Schulz
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Description: |
| Steep pitch thread on the adjusting screw allows the movable jaw to move freely when fine teeth on a "collar" at the base of the adjusting screw are freed from contact with teeth in the socket which normally holds the "collar." The shank of the adjusting screw extends to a block which slides along side the handle. Pushing on the block compresses the spring which holds the "collar" in the socket. |
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