Dual squeeze seal gland

Details Dual squeeze seal gland Dual squeeze seal gland

1982-11-26

1984-02-07

Levy, Stuart S.

Bearings

Rotary bearing

Roller drill bit

175371, 277 26, 277177, E21B 1008

Patent

active

044298544

ABSTRACT:
A resilient O-ring shaft seal for use in a rotary rock bit is described wherein the degree of squeeze imposed upon the O-ring seal is increased in one or more discrete steps, occurring as drilling conditions or bearing deterioration cause rising temperatures to be imposed on the seal. The squeeze is increased in discrete steps through a thermally related shape change in one or more nitinol, or the like, back up rings positioned adjacent to the packing ring seal housed within a seal gland. The seal gland is formed between a rock bit journal and a rock cutter cone rotatably mounted to the journal.

REFERENCES:
patent: 3007721 (1961-11-01), Schmohl et al.
patent: 3923351 (1975-12-01), Frost
patent: 4102419 (1978-07-01), Klima
patent: 4178045 (1979-12-01), Neilson
patent: 4209890 (1980-07-01), Koskie, Jr.
patent: 4281841 (1981-08-01), Kim et al.

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