Drilling bit

Details Drilling bit Drilling bit

1978-09-22

1980-07-22

Footland, Lenard A.

Cutlery

308 361, 3081871, F16C 3380

Patent

active

042136563

ABSTRACT:
A rotary drilling bit having at least one cutter rotatably supported in a rolling bearing on a trunnion of the drilling bit body. An edge ring is provided with a seal fixed in the bored hole of the rotary cutter between the rollers of the rolling bearing and the drilling bit body which axially guides the rollers in one direction. The edge ring has a machined surface which faces the outside surface of the trunnion defining therebetween a narrow annular gap and the seal consists of at least one radially held seal ring arranged in the annular gap.

REFERENCES:
patent: 3251634 (1966-05-01), Dareing
patent: 4035039 (1977-07-01), Johansson et al.
patent: 4153258 (1979-05-01), Huber et al.

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