Rock bit with diamond reamer to maintain gage

Details Rock bit with diamond reamer to maintain gage Rock bit with diamond reamer to maintain gage

E - Fixed Constructions

21

B

255/74

E21B 10/00 (2006.01)

Patent

CA 1085380

Abstract A rock drill bit comprises a bit body and at least one rolling cone cutter mounted on the bit body, the rolling cone cutter comprising a plurality of tungsten carbide inserts including a plurality of gage inserts for drilling adjacent the peripheral wall of the hole being drilled. At least one diamond cutter protrudes from the bit body to provide a cutting edge substantially on the gage diameter of the rock bit so that such a diamond insert can engage the peripheral wall of the hole being drilled, thereby maintaining the hole gage. Each diamond cutter comprises a carbide slug inserted in the bit body and a diamond plate bonded to the slug. Such diamond cutters are on a peripheral portion of the bit body above the cutter cones.

309553

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