US Patent: 42,560
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| Ratchet Drill
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Patentee:
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| John C. Chapman (exact or similar names) - Charlestown, MA |
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Patent Dates:
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| Granted: |
May 03, 1864 |
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Patent Pictures:
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John C. Chapman patent May 3, 1864 |
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Stan Schulz
Chapman's Self-Feeding Ratchet (Scientific American - FLICKR)
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Description: |
| Self-feeding ratchet drill; in the preferred form, the feed screw has left-hand thread. The feed ratchet works on a two-piece sleeve with the interior piece having interior threads. The rate of feed can be regulated by holding the feed ratchet out of engagement.
Chapman's Self-Feeding Ratchet Drill appears in 19th Century catalogs; the original design and subsequent improved versions were produced by J. J. Walworth Co. of Boston. |
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