Rotary drill bit

Details Rotary drill bit Rotary drill bit

1981-03-24

1985-12-10

Levy, Stuart S.

Bearings

Rotary bearing

Roller drill bit

175372, 277228, F16C 3378, E21B 935

Patent

active

045576092

ABSTRACT:
A sealed rotary drill bit comprising at least one rotatably carried roller cutter (13) and provided with a seal between the cutter and a mounting head (22) for preventing lubricating medium from being discharged from the bearing (14, 15, 16, 17, 18) and impurities from entering the bearing. For purposes of decreasing the friction the seal (22) is provided with a low friction material on a portion of the seal which engages the head to promote rotation between the seal and the head. The portion of the seal which engages the roller cutter has a material of higher frictional coefficient to resist relative rotation between the seal and the roller cutter (25).

REFERENCES:
patent: 2717025 (1955-09-01), Jelinek
patent: 2868575 (1959-01-01), Hawxhurst
patent: 3097893 (1963-07-01), White
patent: 3322433 (1967-05-01), Rentschler
patent: 3397928 (1968-08-01), Galle
patent: 3467448 (1969-09-01), Galle
patent: 3604523 (1971-09-01), Lichte
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 3848880 (1974-11-01), Tanner
patent: 3866987 (1975-02-01), Garner
patent: 4167219 (1979-09-01), McQueen
patent: 4168868 (1979-09-01), Shields
patent: 4200343 (1980-04-01), Highsmith
patent: 4306727 (1981-12-01), Deane et al.
"Slipper Seals: O-Rings with TEFLON for Low Wear", R. E. Huffman, The Journal of Teflon, vol. 5, No. 4, May 1964, p. 7.

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