Top head drive assembly with axially movable quill

Details Top head drive assembly with axially movable quill Top head drive assembly with axially movable quill

1987-04-02

1989-03-28

Bell, Paul A.

Tool driving or impacting

Hammer or tool shaft reciprocated by gripping means which...

With fixed means cyclically contacted by grip structure

173163, 173 73, E21C 708

Patent

active

048155462

ABSTRACT:
A top head drive assembly includes a tubular quill having a central passageway aligned with an axis. The quill is supported for rotation on a load beam included in the top head drive assembly such that the quill is movable along the axis through a range of travel sufficient to provide thread protection to the down hole tubulars during tubular handling operations. Splines drivingly connect the quill with a transmission such that the transmission is operative to rotate the quill throughout the range of travel of the quill along the axis. A blowout preventer valve is mounted in an upper part of the quill to move axially and rotationally with the quill in order to eliminate sliding or rotary seals between the blowout preventer valve and the drill string.

REFERENCES:
patent: 2375432 (1945-05-01), Miller et al.
patent: 2390601 (1945-12-01), Maier
patent: 3662842 (1972-05-01), Bromell
patent: 3736993 (1973-06-01), West
patent: 3921731 (1975-11-01), Ekwall et al.
patent: 4314611 (1982-02-01), Willis

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