Tapered friction bearing assembly

Details Tapered friction bearing assembly Tapered friction bearing assembly

1986-01-28

1987-04-14

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

175107, 384271, E21B 402, F16C 1710

Patent

active

046570900

ABSTRACT:
A bearing structure including first and second tapered bearing surfaces for accommodating on-bottom and off-bottom thrust and radial forces on a drive shaft in a down hole drilling environment and further including a radial bearing mounted between the first and second tapered bearings for restricting bending of the drive shaft.

REFERENCES:
patent: 2919960 (1960-01-01), Whitney
patent: 3391965 (1968-07-01), Lindeboom
patent: 3484143 (1969-12-01), Tallian et al.
patent: 3606501 (1971-09-01), Waplington
patent: 4410054 (1983-10-01), Nagel et al.
patent: 4518049 (1985-05-01), Baldenka et al.
patent: 4546836 (1985-10-01), Dennis et al.

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