Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1991-10-02
1992-12-08
Watts, Douglas D.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173 9, 91420, 60460, E21B 1908
Patent
active
051689375
ABSTRACT:
An apparatus includes a feed cylinder having a first end port and a second end port. A feed cylinder is located within the feed cylinder and is movable in a drive direction in response to fluid pressure applied to the first end port, and is movable in a return direction in response to fluid pressure applied to the second end port. A feed pump selectively displaces fluid between the first and the second end ports. A variable overcenter device controls fluid pressure offset, independent of the feed pump, between the first end port and the second end port. An adjustment device automatically adjusts the variable overcenter device during travel of the feed cylinder in the drive direction to a value corresponding to an amount of force required to displace the feed cylinder in the return direction. The variable overcenter device may be either microprocessor based or mechanically based including an accumulator reservoir which builds to a certain pressure based upon the amount of weight of the drill string when the feed cylinder was last displaced in the return direction.
REFERENCES:
patent: 2790340 (1957-04-01), Cross
patent: 3648783 (1972-03-01), Lackey
patent: 3659655 (1972-05-01), Gyongyosi
patent: 4440236 (1984-04-01), Shiihara et al.
patent: 4711090 (1987-12-01), Hartiala et al.
patent: 4732076 (1988-03-01), Ewald
patent: 4953639 (1990-09-01), Hamner et al.
Foster Glenn B.
Ingersoll-Rand Company
Selko John J.
Smith Scott A.
Watts Douglas D.
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