Compact casing tongs for use on top head drive earth...

Details Compact casing tongs for use on top head drive earth... Compact casing tongs for use on top head drive earth...

E - Fixed Constructions

21

B

166/60, 255/14.7

E21B 3/02 (2006.01) A41H 37/00 (2006.01)

Patent

CA 1302391

ABSTRACT OF THE DISCLOSURE Compact casing tongs include a tube which is secured to a connector, the connector in turn being supported and rotated by a quill of a top head drive assembly. The lower end of the tube rigidly supports a set of cams which define multiple recesses. A jaw is mounted in each recess, and each of the jaws is con- nected to a brake ring positioned outside the tube. By externally braking the brake ring while the quill con- nector body is rotated, the jaws are shifted out of the recesses to grip the exterior of a casing positioned within the tube. The tube is dimensioned to ensure that the jaws engage the body of the casing beneath the upper collar of the casing.

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