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US Patent: 38,486
Metal Drill Clutch
Improved Friction Clutch
Patentee:
Simon Ingersoll - Stamford, CT

USPTO Classifications:
408/121, 408/140

Tool Categories:
woodworking tools : hand drills

Assignees:
None

Manufacturer:
Betts & Ingersoll - Stamford, CT

Witnesses:
Seth Miller
Wm. H. Holly

Patent Dates:
Granted: May 12, 1863

Patent Pictures:
Simon Ingersoll patent May 12, 1863
USPTO pdf tiff
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Description:
Two sets of friction surfaces; one set having facing inclined planes so the "down force" increases as the planes slide past each other. The specifications note this friction clutch could be used in several applications.

Manufacturer attribution based on a SCIENTIFIC AMERICAN write-up.

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