Sub assembly for a swivel
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United States of America Patent
Stats
-
Nov 1, 1988
Grant Date -
N/A
app pub date -
Sep 23, 1987
filing date -
Sep 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sub assembly for connecting a power swivel to a drill string. The assembly includes a telescopic sub having a preloaded spring. The telescopic sub has three discrete positions enabling it to travel in either direction from a normal position. This capability prevents thread damage for both when connecting and disconnecting a drill pipe to the drill string.
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Cited Art Landscape
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