Tool driving or impacting – Self-acting advance and retraction cycle
Patent
1984-07-12
1986-09-23
Kazenske, E. R.
Tool driving or impacting
Self-acting advance and retraction cycle
175145, 408137, B23B 4722
Patent
active
046129987
ABSTRACT:
A positive feed drill having a spindle drive gear train and a spindle feed gear train coupled to the drive gear train by side teeth on coupling gears mounted on the same shaft is provided with actuatable means for uncoupling the feed coupling gear from the drive coupling gear, and locking it when the spindle has been fed a predetermined extent, thereby retracting the spindle, and for unlocking the feed gear train, once the spindle is retracted, without recoupling it to the drive gear train, thereby holding the feed gear train in an idle mode until the automatic means is manually reset. The automatic means is comprised of a piston which raises the shaft of the feed coupling gear out of engagement with the drive coupling gear and into engagement of fixed teeth on the inside of the gear housing, and spring biased means including a slot for holding the shaft and feed coupling gear away from the drive coupling gear to an extent determined by a dimension of the slot so as not to permit re-engagement of the drive coupling gear after disengagement with the fixed teeth, thereby holding the feed gear in an idle mode until the spring biased means is manually reset against the force of the spring.
REFERENCES:
patent: 2722855 (1955-11-01), Van Scoy
patent: 3512434 (1970-05-01), Juhasz et al.
patent: 3583822 (1971-06-01), Alexander et al.
patent: 3897166 (1975-07-01), Adams
patent: 4418767 (1983-12-01), Virder
Fridie, Jr. William
Kazenske E. R.
P. V. Tool, Inc.
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