Cutting by use of rotating axially moving tool – With stopping upon completion of prescribed operation
Patent
1976-10-07
1978-09-05
Yost, Frank T.
Cutting by use of rotating axially moving tool
With stopping upon completion of prescribed operation
408130, 488134, B23B 4718
Patent
active
041115902
ABSTRACT:
A positive feed drill having an elongated spindle mounted for reversible longitudinal motion in a drill housing. The spindle has an hexagonal cross-section with the apices of the hexagon being threaded. A toothed drive gear having a hexagonal aperture centrally thereof has a close sliding fit with the spindle and is mounted for rotating the spindle. A feed gear having a threaded aperture centrally thereof is in threaded engagement with the spindle apices and is selectively rotated at a different rotational speed than the drive gear to longitudinally advance and retract the spindle. A gear for driving the feed gear is pin-slot locked to a motor gear for longitudinal spindle advancement, and is pin-slot locked to the housing for rapid spindle retraction. A pneumatic circuit in cooperation with limit valves and stop members provides completely automatic drilling to an adjustable depth, a dwell, and a positive retract operation with an economy of pneumatic energy. A lost-motion dwell linkage between the spindle and a drill bit provides a longitudinal dwell during which the bit rotates a predetermined number of turns during spindle dwell to provide burr-free polishing.
REFERENCES:
patent: 2271717 (1942-02-01), Schwartz
patent: 3487729 (1970-01-01), Juhasz et al.
patent: 3762827 (1973-10-01), Ziegelmeyer
patent: 3767313 (1973-10-01), Bohoroquez et al.
Burkart Robert C.
Newbould Gilbert J.
Eash Robert E.
Yost Frank T.
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