Sealing system for a rolling cone cutter earth boring bit

Details Sealing system for a rolling cone cutter earth boring bit Sealing system for a rolling cone cutter earth boring bit

1978-11-24

1981-03-17

Footland, Lenard A.

Cutlery

308 361, F16C 3372

Patent

active

042563518

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 an earth boring bit and retains lubricant inside the bearing area. At least one bearing pin extends from the body of an earth boring bit and a rolling cone 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 an annular rigid ring, an elastomeric ring and a deformable ring means mounted to rotate with said rolling cone cutter. The elastomeric ring is attached to the annular rigid ring. The elastomeric ring has a lip with a wiping surface that contacts the bearing pin. The deformable ring means is connected to the lip and maintains contact between the wiping surface and the bearing pin.

REFERENCES:
patent: 3397928 (1968-08-01), Galle
patent: 3601417 (1971-08-01), Szepesvary
patent: 4134596 (1979-01-01), Kawai et al.
patent: 4141563 (1979-02-01), Wu

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