Drilling apparatus and cutter

Details Drilling apparatus and cutter Drilling apparatus and cutter

E - Fixed Constructions

21

B

255/76, 255/81

E21B 10/34 (2006.01) E21B 10/20 (2006.01) E21B 10/22 (2006.01)

Patent

CA 1326660

ABSTRACT OF THE DISCLOSURE An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a sleeve member detachably secured to the lower end of each arm and adapted to receive the frictional wear caused by the rotation of the conical cutter mounted thereto. Bearings and seals disposed between the cutter and the sleeve member provide smooth rotation of the cutter. In addition, means extending between the arm and the sleeve member secure the sleeve on the arm. The arms are pivotally mounted in slots in the body and means are provided for moving the arms to their cutting position with their lower ends positioned radially outward from the body.

544295

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