Self-aligning top drive

Details Self-aligning top drive Self-aligning top drive

1988-02-12

1989-11-07

Yost, Frank T.

Tool driving or impacting

Means to drive tool about an axis

Means to hold and relatively rotate sections of tool shaft

173147, 175 85, E21B 300

Patent

active

048785466

ABSTRACT:
A self-aligning top drive device and gimballing apparatus therefor. The gimballing apparatus provides horizontal and tilting movement to maintain alignment between a top drive and a tubular or tubulars suspended in a derrick, the gimballing provided by pivot pins extending from the sides of the top drive into a portion of a gimbal frame and by a pivot pin extending from the gimbal frame into a gimbal frame support. The gimbal frame support can be movably mounted on a top drive dolly to provide displacement of the top drive with respect to the dolly.

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