Powered back-up tongs

Details Powered back-up tongs Powered back-up tongs

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01) B25B 17/00 (2006.01)

Patent

CA 1231088

POWERED BACK-UP TONGS, ABSTRACT A powered back-up assembly is provided for securing a pipe against rotation. A plurality of heads are supported by a cage plate assembly, and are brought into gripping engagement with the pipe by rotating the cage plate assembly relative to a cam ring fixed to the body of the tong body. The cage plate assembly is rotated by a pair of hydraulic cylinders each connected at one end to a bar pivotably connected to the tong body. A third hydraulic cylinder interconnected between adjacent upper and lower tong bodies may be employed to achieve a reliable scissors tong, whereby the body of the upper tong is rotatable relative to the body of the lower tong.

483458

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