Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent
1974-08-12
1976-03-09
Brown, David H.
Tool driving or impacting
Advance causing or controlling means
Motor causes or controls advance
173164, 175 85, 166 775, E21C 110
Patent
active
039425924
ABSTRACT:
A system for use in the make-up or break-out of drill stem members of earth boring machines having a hydraulically operated power swivel to rotate the drill stem and hydraulic cylinders to raise and lower the swivel. A first, variable volume pump supplies fluid to the hydraulic cylinder through a four-way valve. A servo pump controller, connected with this valve and operable by variable resistors, establishes the linear make-up and break-out speeds for the power swivel. A second, variable volume and reversible pump supplies fluid to the power swivel means. A second servo pump controller, connected with the second pump and operable by variable resistors, establishes selected linear rotational travel speeds for the power swivel. Make-up torque is controlled by an electrical solenoid activated pressure compensator connected with the second pump, and linear speed is similarly controlled.
REFERENCES:
patent: 3158213 (1964-11-01), O'Neill et al.
patent: 3460638 (1969-08-01), Millsapps
patent: 3695363 (1972-10-01), Kelly
patent: 3696872 (1972-10-01), Jonsson
patent: 3719237 (1973-03-01), Flick
Brown David H.
Felsman Robert A.
Hughes Tool Company
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