Plunger lubricant compensator for an earth boring drill bit

Details Plunger lubricant compensator for an earth boring drill bit Plunger lubricant compensator for an earth boring drill bit

1980-05-01

1983-06-07

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

175227, 175371, 175372, 277 95, 384 93, E21B 1022

Patent

active

043866670

ABSTRACT:
An earth boring drill bit has a lubricant pressure compensator that includes a plunger that moves slidingly in the reservoir to reduce pressure differential, and also allows lubricant to bleed past to relieve excess lubricant pressure. The plunger is carried slidingly in the reservoir. The plunger has a convex end in contact with the lubricant and a concave end in contact with the borehole fluid. The plunger has a rod that contacts a stop in the reservoir when the lubricant pressure is greater than the borehole pressure. Once stopped, the configuration of the plunger allows lubricant to bleed past the plunger to relieve excess lubricant pressure.

REFERENCES:
patent: 2150529 (1939-03-01), Tremolada
patent: 2187037 (1940-01-01), Kirkpatrick
patent: 2912999 (1959-11-01), Kersh
patent: 3075781 (1963-01-01), Atkinson et al.
patent: 3199878 (1965-08-01), Cunningham et al.
patent: 3299973 (1967-01-01), Swart et al.
patent: 3303898 (1967-02-01), Bercaru
patent: 3370895 (1968-02-01), Cason, Jr.
patent: 3476195 (1969-11-01), Galle
patent: 3612197 (1971-10-01), Motoyama
patent: 3942596 (1976-03-01), Millsapps, Jr.

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