Rotary drill bit with rotary cutter

Details Rotary drill bit with rotary cutter Rotary drill bit with rotary cutter

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) E21B 10/20 (2006.01) E21B 10/22 (2006.01)

Patent

CA 1090775

ABSTRACT A rotary drill bit having a drill bit body and at least one trunnion projecting from the drill bit body and a rotary cutter supported on at least one radial roller bearing on the trunnion. The rolling elements of the bearing are guided on at least one axial end facing the drill bit body in an outer bearing race groove incorporated in the bore of the rotary cutter. The inner bearing race groove is formed on the trunnion for the rolling elements of the radial roller bearing. At least one filling opening is pro- vided which extends through the drill bit body and trunnion and is essentially axially oriented having one terminal end adjacent the inner bearing race groove and at least one filler piece for sealing the opening.

328775

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