Rolling cutter drill bit with annular seal rings

Details Rolling cutter drill bit with annular seal rings Rolling cutter drill bit with annular seal rings

1977-04-06

1978-07-25

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277221, 308 82, E21C 1300, E21B 910

Patent

active

041024192

ABSTRACT:
A rotary drill bit having a rolling cutter mounted on a journal by means of internal, anti-friction bearings is provided with a sealing ring between the journal and cutter. The journal and cutter have facing, circumferential surfaces of which one surface is provided with a groove facing the other surface. One or more annular sealing rings are spring pressed against and carried by the other surface and extend into and seal against the annular groove to seal the interior bearings from contamination. The one or more rings are forced under spring pressure into the annular groove when the cutter is mounted to the journal, the ring or rings returning under spring pressure to press against and be carried by the other circumferential surface while yet extending into and sealing against the groove. In the latter position, radially spaced confronting surfaces of the sealing ring or rings and the groove define therebetween an annular space, and the journal may be provided with a passageway for conducting air or other fluid under pressure to the annular space.

REFERENCES:
patent: 1353082 (1920-09-01), Stehle et al.
patent: 1391795 (1921-09-01), Safford
patent: 1527307 (1925-02-01), Kamzlick
patent: 2485862 (1949-10-01), Caza
patent: 3244459 (1966-04-01), Ortloff
patent: 3303898 (1967-02-01), Bercaru
patent: 3397928 (1968-08-01), Galle
patent: 3449024 (1969-06-01), Lichte
patent: 3467448 (1969-09-01), Galle
patent: 3656764 (1972-04-01), Robinson

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