Dual camming action jaw assembly and power tong

Details Dual camming action jaw assembly and power tong Dual camming action jaw assembly and power tong

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01)

Patent

CA 1167025

ABSTRACT A rotary tong for use in well drilling operations to make up and break out drill strings or similar axially elongated objects which has a secondary camming action provided by the jaw assembly. By use of the inventive jaw assembly a secondary camming action is produced which reduces the cam angle of the primary camming function. The reduced cam angle gives greater gripping force thereby reducing slippage. The secondary camming function also allows the jaw to be used for a greater variety of drill string sizes thereby reducing the need to change tongs or jaw elements when drill string sizes change.

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