Positive feed drill with stop control

Details Positive feed drill with stop control Positive feed drill with stop control

1984-06-13

1985-09-03

Schran, Donald R.

Cutting by use of rotating axially moving tool

With stopping upon completion of prescribed operation

173 19, 173146, 408132, 408137, B23B 4722, B23Q 520

Patent

active

045389420

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 respective drive and feed coupling gears mounted on a common shaft, is provided with a spring between the feed coupling gear and a housing to bias the feed coupling gear against the drive coupling gear to feed the spindle forward as it drills. A positive stop prevents the spindle from feeding beyond a predetermined point, thus causing the feed coupling gear to be driven by the spindle. A slope on the faces of the side teeth engaging the drive and coupling gears in order to allow the feed coupling gear to ratchet over the drive coupling gear when the spindle feed reaches the positive stop.

REFERENCES:
patent: 434576 (1890-08-01), Wyman
patent: 3429206 (1969-02-01), Quackenbush
patent: 3512434 (1970-05-01), Juhasz et al.
patent: 3574290 (1971-04-01), Eckman
patent: 3583822 (1971-06-01), Alexander
patent: 4418767 (1983-12-01), Vindez

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