Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1984-09-24
1987-05-05
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
175 27, 175162, B66D 148, E21B 1900
Patent
active
046626085
ABSTRACT:
An automatic drilling control system is disclosed for a conventional drilling apparatus and rig having a drill line rolled up or fed off the drum during drilling by the engine and extending through a crown block and traveling block to a fixed point providing a dead line. The crown block and traveling block form a pulley system for supporting a drill pipe during drilling. A weight indicator gauge on the drilling console is hydraulically actuated from a pressure sensor connected to the dead line. A conventional brake drum controls the rate of feed out of the drill line to determine the tension of the dead line. A double-acting, fluid-actuated cylinder and piston connected to the brake handle positively move it to control the brake force on the drum. A three-way electric solenoid valve controls the application of pressurized fluid selectively to the piston in response to a pressure transducer in the hydraulic line from the pressure sensor. This provides a very close control of bit weight and provides greater drilling speed and greater uniformity of drilling operation. The apparatus may be supplemented with controls which operate the brake in response to overspeed of the drum or in response to close approach of the traveling block to the crown block to apply a braking force to stop the apparatus and prevent damage.
REFERENCES:
patent: 2867411 (1959-01-01), Simmonds et al.
patent: 3759489 (1973-09-01), Jones
patent: 4046355 (1977-09-01), Martin
patent: 4519585 (1985-05-01), Furrow
Levy Stuart S.
Werner David
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