Drilling rig

Details Drilling rig Drilling rig

1982-07-02

1984-05-15

Raduazo, Henry E.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Tilts relative to base

521261, 521272, 60581, E04H 1234

Patent

active

044479972

ABSTRACT:
A drilling rig comprising a base; and an A-frame carried by the base. The A-frame has left and right hydraulic mast cylinders with pistons in the cylinders. The rig also has a mast pivoted on the base and capable of being raised from a horizontal position to a vertical position. The mast has left and right pads adapted to respectively contact the left and right mast pistons before the center of gravity of the mast passes a point directly above the axis of rotation of the mast. The rig also has drawworks adapted to raise the mast about its axis of rotation; and has a hydraulic control system comprising means for synchronizing the movement of the left mast piston with the right mast piston.

REFERENCES:
patent: 2429009 (1947-10-01), Woolslayer
patent: 2499563 (1950-05-01), Bill
patent: 3032147 (1962-05-01), Wilkinson
patent: 3262237 (1966-07-01), Jenkins
patent: 3995701 (1976-12-01), Kelly
patent: 4351153 (1982-09-01), Kosmala

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