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US Patent: 42,560
Ratchet Drill
Patentee:
John C. Chapman (exact or similar names) - Charlestown, MA

USPTO Classifications:
408/121

Tool Categories:
metalworking tools : ratchet drills

Assignees:
None

Manufacturer:
J. J. Walworth & Co. - Cambridge, MA

Witnesses:
N. W. Stearns
P. E. Teschemacher

Patent Dates:
Granted: May 03, 1864

Patent Pictures: [ 1 | 2 ]
John C. Chapman patent May 3, 1864
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Chapman's Self-Feeding Ratchet (Scientific American - FLICKR)
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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