Roller bit

Details Roller bit Roller bit

1990-07-06

1991-04-09

Hannon, Thomas R.

Bearings

Rotary bearing

Roller drill bit

175371, 277 92, E21B 1022, F16C 3372

Patent

active

050059890

ABSTRACT:
A roller bit comprises a plurality of legs each of which has a longitudinally extending pin. A cutting cone is rotatably mounted on each of the pins and a prefabricated sealing insert is fixedly connected at a longitudinally inner end of each of the pins. A sealing element is positioned between the cone and a sealing surface of the insert. The insert is formed of a material having a hardness greater than a core hardness of the pin.

REFERENCES:
patent: 4168868 (1979-09-01), Shields
patent: 4277110 (1981-07-01), Fox
patent: 4279450 (1981-07-01), Morris
patent: 4303137 (1981-12-01), Fisher
patent: 4452539 (1984-06-01), Evans et al.
patent: 4516641 (1985-05-01), Burr
patent: 4613004 (1986-09-01), Shotwell
patent: 4722404 (1988-02-01), Evans
patent: 4793719 (1988-12-01), Crockett et al.
patent: 4822057 (1989-04-01), Chia et al.
patent: 4824123 (1989-04-01), Chia et al.

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