Drilling rig

Details Drilling rig Drilling rig

1990-06-15

1992-03-10

Watts, Douglas D.

Tool driving or impacting

With vehicle support for drive

Drive structure moved to nonuse position for transport

173148, E21B 702

Patent

active

050943022

ABSTRACT:
A mobile drilling rig includes a rectangular tube which is used for the derrick and is normally transported on the vehicle in a generally horizontal attitude. The derrick is pivoted to vertical position by a hydraulic cylinder. A pulldown system located inside the tube includes a double-acting hydraulic pulldown cylinder, drive pinions mounted to the piston rod, one gear rack fixed inside the tube and another gear rack slidable inside the tube. A drill-driving powerhead is slidably mounted on the outside of the tube and is connected to the slidable gear rack. The pinions connected to the pulldown cylinder piston rod engage both racks and, with a piston stroke less than half the length of the tube, drive the power head essentially the full length of the tube for the pull-down function.

REFERENCES:
patent: 478795 (1892-07-01), Hummel
patent: 1243580 (1917-10-01), Besancon
patent: 1497310 (1924-01-01), Monroe
patent: 1502383 (1924-07-01), Guerrini et al.
patent: 2130982 (1938-09-01), Gartin
patent: 2225588 (1940-12-01), Gartin
patent: 2410959 (1946-11-01), Brown
patent: 2903949 (1959-09-01), Simmonds
patent: 3464655 (1969-09-01), Schuman
patent: 3520374 (1970-07-01), Ebert
patent: 3732935 (1973-05-01), Gibson
patent: 3867989 (1975-02-01), Hisey et al.
patent: 4049064 (1977-09-01), Chubb et al.
patent: 4646206 (1987-02-01), Bauer et al.

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