Power tong and back-up tong assembly

Details Power tong and back-up tong assembly Power tong and back-up tong assembly

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01)

Patent

CA 1190919

ABSTRACT OF THE DISCLOSURE A new and improved power tong and back-up tong assembly is provided herein. It is comprised of a power tong having a rotatable cam surface which cooperates with jam assemblies to grip and rotate a first pipe and a back-up tong having a fixed cam ring and jaw assemblies. These are rotated against the cam ring in the same direction as the cam surface of the power tong rotates until an initial grip is achieved on a second pipe which is to be held while the first pipe is threaded or unthreaded relative thereto.

421702

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