Spindle motor powered drawbar

Details Spindle motor powered drawbar Spindle motor powered drawbar

1981-12-21

1983-11-08

Briggs, William R.

Gear cutting, milling, or planing

Milling

Cutter spindle or spindle support

279 8, 408239R, B23C 526

Patent

active

044139381

ABSTRACT:
The spindle of a machine tool has a drawbar disposed therein for threaded engagement into and out of the toolholder inserted into the spindle bore to releaseably secure the toolholder within the spindle. Splined on the rearward end of the drawbar distal from the spindle is a spur gear which is shiftable into and out of engagement with a cluster gear driven by the spindle drive motor. When the spur gear on the rearward drawbar end is shifted into engagement with the cluster gear driven by the spindle drive motor, the drawbar will be rotatably threaded either into or out of the toolholder shank by the spindle drive motor and thus, the need for a separate motor to rotatably drive the drawbar is eliminated.

REFERENCES:
patent: 3482712 (1974-10-01), Bondie
patent: 3806272 (1974-04-01), Muller
patent: 3823642 (1974-07-01), Jerve
patent: 3893371 (1975-07-01), Frazier
patent: 4131054 (1978-12-01), Johnson et al.
patent: 4199286 (1980-04-01), Kirkham

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