High temperature sealing system for a rotary rock bit

Details High temperature sealing system for a rotary rock bit High temperature sealing system for a rotary rock bit

1979-10-09

1981-03-03

Stearns, Richard R.

Cutlery

308 361, 308187, 175372, 277 56, F16C 3380, E21B 908, E21B 935

Patent

active

042537100

ABSTRACT:
A sealing system acts as a barrier to the drilling fluid, pulverized cuttings and other materials in the borehole preventing the materials from entering the bearing area of a rotary rock bit and retains lubricant inside the bearing area of the bit. At least one bearing pin extends from the body of the bit and a rolling cutter is mounted on the bearing pin. A seal assembly is located in the mouth of the cutter between the cutter and the bearing pin. The seal assembly includes a non-rotating element affixed to the bearing pin and a rotating element affixed to the rolling cutter. The rotating and non-rotating elements have intermeshing labyrinthine projections that may be constructed of heat resistant materials.

REFERENCES:
patent: 3680873 (1972-08-01), Garner
patent: 3719241 (1973-03-01), Bell
patent: 3944306 (1976-03-01), Neilson
patent: 4073548 (1978-02-01), Walters

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