E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14.7
E21B 19/16 (2006.01) B23P 19/06 (2006.01)
Patent
CA 2004458
An apparatus for connecting and disconnecting threaded members comprises a power tong having a pipe receiving recess and a jaw assembly for gripping and rotating a first pipe. A backup unit is disposed below the power tong for gripping a second pipe. Means are provided for transmitting reaction forces generated by the power tong to the backup unit which means comprise: a first member connected to one of the power tong and the backup unit remote from the pipe receiving recess thereof and to the other of the power tong and the backup unit to one side of the pipe receiving recess thereof; a second member connected to the one of the power tong and the backup unit remote from the pipe receiving recess thereof and to the other of the power tong and the pipe receiving recess to the other side thereof; and means for transmitting compressive and/or tensile forces in one of the first and second members to the other of the first and second member. In one embodiment the means comprise a mechanical connection between the first and second members. In another embodiment the means comprise a hydraulic connection between double acting hydraulic piston and cylinder assemblies incorporated in the first and second members.
Marks & Clerk
Weatherford U.s. Inc.
Weatherford/lamb Inc.
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