Rock drill bit

Details Rock drill bit Rock drill bit

E - Fixed Constructions

21

B

255/78

E21B 10/00 (2006.01) E21B 10/20 (2006.01) E21B 10/24 (2006.01)

Patent

CA 1064014

ABSTRACT OF THE DISCLOSURE A rock drill bit is provided with a fluid seal for the cutter bear- ing. The bit has a bit segment on which an annular outer bearing race is re- movably mounted. The bearing race carries a rotary cutter with a hub project- ing into the center of the race and an inside surface overlying the outer sur- face of the race to provide a narrow gap. The gap and thus the bearing is sealed by a pressurized fluid flowing through ducts in the bit, into the gap and out of its open end to flush away any fine cuttings.

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