Bellows lubricant pressurizer for sealed bearing rock bits

Details Bellows lubricant pressurizer for sealed bearing rock bits Bellows lubricant pressurizer for sealed bearing rock bits

1984-04-23

1986-03-25

Leppink, James A.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175371, 184 54, 384 93, E21B 908

Patent

active

045777055

ABSTRACT:
This invention discloses the utilization of a metal bellows in a grease reservoir cavity that is compressed during a rock bit grease filling process to create a positive pressure differential between the internal cavities in the bit and the outside atmosphere.

REFERENCES:
patent: 3476195 (1969-11-01), Galle
patent: 3721306 (1973-03-01), Sartor
patent: 3847234 (1974-11-01), Schumacher, Jr. et al.
patent: 3866695 (1975-02-01), Jackson
patent: 4161223 (1979-07-01), Oelke
patent: 4276946 (1981-07-01), Millsapps, Jr.
patent: 4388984 (1983-06-01), Oelke

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