Articulated elevator links for top drive drill rig
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United States of America Patent
Stats
-
Dec 27, 1988
Grant Date -
N/A
app pub date -
Mar 16, 1988
filing date -
Mar 16, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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