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US Patent: 1,203,178
Chuck
Ball-bearing, geared, three jaw chuck.
Patentee:
Earnest C. Bowers - Kalamazoo, MI

USPTO Classifications:
279/63

Tool Categories:

Assignees:
Eugene Cook - Kalamazoo, MI

Manufacturer:
Not known to have been produced

Witnesses:
Luella G. Greenfield
Margaret L. Glasgow
L. G. Blake
Lenn Gihman

Patent Dates:
Applied: Apr. 19, 1915
Granted: Oct. 31, 1916

Patent Pictures:
All but one patent image condensed here.
USPTO pdf tiff
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Description:
Chuck takes advantage of the ball bearings and a left-handed axial thread to add to the usual tendency to grip the bit tighter, the greater the drilling torque applied to the chuck.

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