Power tong and backup tong system

Details Power tong and backup tong system Power tong and backup tong system

B - Operations, Transporting

25

B

B25B 13/50 (2006.01) B25B 13/48 (2006.01) E21B 19/00 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2269393

A power tong system, comprising a frame having a rear support and a front support, the front support comprising a first front leg and a second front leg; and a power tong mounted in the frame with the power tong extending transversely between the first front leg and the second front leg, the first front leg and the second front leg forming a guide preventing transverse motion of the power tong while allowing vertical movement of the power tong. The system is also preferably provided with a backup tong. The sides of the power tong are preferably provided with rollers to prevent friction between the power tong and the guide. In a second power tong system, a load cell assembly is provided in which a load cell is linked by a series of links to the power tong such that movement by the power tong in either of two transverse directions loads the load cell. In a third power tong system, an improved backup tong is provided in which jaws, preferably symmetrically disposed on the backup tong and each carrying dies, are moved about pivots by a rigid link between the jaws and a linear actuator. The dies are preferably provided with more than one die seat for locating the dies at different positions on the jaws. A third die may be provided, preferably symmetrically arranged with the dies on the jaws. The third die may be located on the linear actuator.

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