US Patent: 4,303,360 - Power Drawfinger System for Machine Tool Spindle


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US Patent: 4,303,360

Power Drawfinger System for Machine Tool Spindle

Patentees:

Donald J. Cayen (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

John T. Janeczko (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

USPTO Classifications:

408/239A, 409/134, 409/233

Tool Categories:

metalworking machines : metalworking machine mechanisms

Assignees:

Giddings & Lewis, Inc. - Fond Du Lac, Fond Du Lac County, WI

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Feb. 29, 1980
Granted:	Dec. 01, 1981

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.

Description:

Abstract:

A power drawfinger system for selectively locking and releasing a toolholder or arbor in the socket of a power driven machine tool spindle. The system includes a collet device actuated by a power draw-bolt using hydraulic means for expanding said device and a resilient member for contracting same to disengage or engage the toolholder. The collet device and drawbar mechanisms are constructed to be fail safe in event of breakage of the collet or loss of power.