Hydraulic feed control system for rotary drill

Details Hydraulic feed control system for rotary drill Hydraulic feed control system for rotary drill

1976-06-01

1977-07-05

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Having plural energy input means, pumps or diverse pump outlets

91 6, 91444, 91462, F15B 1309, F15B 1522

Patent

active

040331296

ABSTRACT:
An hydraulic feed control system for feeding or retracting a rotary rock drill relative to the work in a selected one of four modes; namely, standard feed; regeneration feed; standard retract; and rapid retract. The system includes an hydraulic circuit controlling the feeding and retraction of feed cylinders connected to the drill; a pair of hydraulic pressure supply sources; and a pair of manipulative control valves. A primary one of the valves controls flow from one of the sources directly into the circuit; and the other control valve is selectively operable to direct flow from the other source through the primary valve into the circuit so as to combine the flow from both sources for the regeneration feed and rapid retract modes.

REFERENCES:
patent: 1932760 (1933-10-01), West
patent: 2214817 (1940-09-01), Harrington
patent: 2799138 (1957-07-01), Dornhofer
patent: 3171247 (1965-03-01), McAlvay
patent: 3472026 (1969-10-01), Conabee

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