Self-aligning top drive
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United States of America Patent
Stats
-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Feb 12, 1988
filing date -
Feb 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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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