US Patent: 243,978 - Three-jaw chuck with self-aligning jaws


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US Patent: 243,978

Drill-Chuck
Three-jaw chuck with self-aligning jaws

Patentee:

George S. Rominger (exact or similar names) - Philadelphia, PA

USPTO Classifications:

15/104.33, 279/36, 408/239R, 81/114

Tool Categories:

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Armer F. McCormick

Harry Smith

James F. Tobin

Patent Dates:
Applied:	May 03, 1881
Granted:	Jul. 05, 1881

Patent Pictures:

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Description:

This rather idealistic design of a self-avowed "cheap chuck" is doomed to quick breakage because there is an impossible compromise between the delicate inner projections on the jaws and the limited cross section of the groove in the spindle.