US Patent: 620,738
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| Wrench
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Patentee:
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| William V. Chisholm (exact or similar names) - Ashdale, NS Canada |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 11, 1898 |
| Granted: |
Mar. 07, 1899 |
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Patent Pictures:
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William V. Chisholm patent March 7, 1899 |
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Stan Schulz
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Description: |
| A slide in the handle drives a spiral rod with a worm gear that is engaged with rack teeth on a shank extending from the movable jaw. The slide is round, and can be turned with the spiral rod to shift it to a more convenient portion of its range.
Corresponding Canadian patent CA-62,367 was granted January 17, 1899. |
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