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Title: Plunger lubricant compensator for an earth boring drill bit

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.


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Inventors: Millsapps Jr., Stuart C. (Houston, TX)

Application Number: 06/145549
Filing Date: 1980-05-01
Publication_date: 1983-06-07
Assignee: HUGHES TOOL CO

Primary Class(es): 175/228 175/371, 175/372, 175/227, 384/93
Other Classes: E21B10/24; F16N23/00; E21B10/08; E21B10/22
US Patent Ref:
2150529March, 1939Tremolada184/39Rotary swivel
2187037January, 1940Kirkpatrick175/372Well tool or the like
2912999November, 1959Kersh137/512.4Fluid check valve
3075781January, 1963Atkinson et al.277/95Bearing seal
3199878August, 1965Cunningham et al.277/88Seal between a pair of relatively rotatably, radially extending surfaces
3299973January, 1967Swart et al.175/371Lubrication and sealing of well drilling bit
3303898February, 1967Bercaru175/228Bearing sealing and lubricating device
3370895February, 1968Cason, Jr.308/8.2Bearing seal for drilling bits
3476195November, 1969Galle175/228LUBRICANT RELIEF VALVE FOR ROCK BITS
3612197October, 1971Motoyama175/372BIG HOLE DRILLING BIT
3942596March, 1976Millsapps, Jr.175/227Lubricant pressure relief valve for earth penetrating tools

Other Refs: FR2272254
December, 1975175/228

Primary Examiner: Leppink, James A.
Assistant Examiner: Dang, Hoang C.
Attorney: Felsman, Robert A.
Bradley, James E.
Claims: