Articulated elevator links for top drive drill rig

Details Articulated elevator links for top drive drill rig Articulated elevator links for top drive drill rig

1988-03-16

1988-12-27

Dang, Hoang C.

Boring or penetrating the earth

Processes

175 85, 175113, 294 90, 414 2251, E21B 1906

Patent

active

047934220

ABSTRACT:
An apparatus for a top drive drill rig lifts a stand of the drill pipe into engagement with the drive stem in the derrick. The apparatus includes a set of elevators mounted between the drive head by a link assembly. The link assembly includes two link sections connected together by a swivel joint. An upper hydraulic cylinder is connected between the drive head and the upper link section. A lower hydraulic cylinder is connected between the upper and lower link sections. These cylinders may be retracted to pull the stand of drill pipe upward into contact with the drive stem.

REFERENCES:
patent: 3464507 (1969-09-01), Alexander et al.
patent: 3526425 (1970-09-01), Langswski et al.
patent: 3857450 (1974-12-01), Guier
patent: 3915244 (1975-10-01), Brown, deceased
patent: 4326745 (1982-04-01), Guier
patent: 4421447 (1983-12-01), Gudgel et al.
patent: 4489794 (1984-12-01), Boyadjieff
patent: 4625796 (1986-12-01), Boyadjieff
patent: 4667752 (1987-05-01), Berry et al.
Maritime Hydraulics, "Power Swivel DDM-650 Derrick Drilling Machine"; Composite Catalog of Oil Field Equip. & Service, 1984-1985, pp. 5028-1 through 5028-4.

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