US Patent: 134,259 - Improvement in chucks for holding drills


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US Patent: 134,259

Improvement in chucks for holding drills

Patentee:

Austin F. Cushman (exact or similar names) - Hartford, CT

USPTO Classifications:

279/114

Tool Categories:

metalworking machines : drilling and boring : drill presses : drill press chucks

woodworking machines : wood drilling and boring : drill presses : drill press chucks

Assignees:

None

Manufacturer:

A. F. Cushman - Hartford, CT

Witnesses:

Charles H. Hawley

E. L. Cushman

Patent Dates:
Granted:	Dec. 24, 1872

Patent Pictures:

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Wikipedia page on A. F. Cushman

Description:

The chucks jaws contact the bit slightly off center, and have a little bit of play so that when the drill bit contacts the work the jaws cam over which tightens their grip.