Apparatus for connecting and disconnecting threaded members
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United States of America Patent
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Jan 21, 1992
Grant Date -
N/A
app pub date -
Nov 27, 1989
filing date -
Dec 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for connecting and disconnecting threaded members including a power tong, a backup unit disposed below the power tong for gripping a second pipe, and apparatus for transmitting reaction forces generated by the power tong to the backup unit, the backup unit having devices for transmitting compressive or tensile forces between its members from the power tong which, in one embodiment, includes a hydraulic connection between a double acting hydraulic piston and cylinder assemblies incorporated in the members.
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