Rotary drill bit

Details Rotary drill bit Rotary drill bit

E - Fixed Constructions

21

B

255/78

E21B 10/22 (2006.01) F16J 15/32 (2006.01)

Patent

CA 1182443

ABSTRACT A sealed rotary drill bit comprising at least one rotatably carried roller cutter and provided with sealing means for preventing lubricating means from being discharged from the bearing means and impurities from entering the bearing means. For purposes of decreasing the friction the sealing means is provided with a low friction material.

373384

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