Enhanced drill bit lubrication apparatus and method

Details Enhanced drill bit lubrication apparatus and method Enhanced drill bit lubrication apparatus and method

2006-08-18

2008-12-16

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Processes

C175S227000, C175S343000, C175S353000, C175S372000

Reexamination Certificate

active

07464773

ABSTRACT:
A lubricating nutating single cone drill bit10includes bit shank12with an axially skewed journal18rotatably retaining cutter body22. Bearings (26, 28, 30, 32) enable rotation of the cutter body22. Lubrication flows to a gap between the axially skewed journal18and cutter body22from lubricant chamber76having plunger80acted on by an annulus fluid, the gap bounded by first66and second68radial dynamic seals. A fluid passage90extending through the bit10communicates with fluid inlet port88on the proximal end16of the bit shank12. Fluid passage90also communicates with a first fluid outlet port98on the distal end36of the axially skewed journal 18 and with a second fluid outlet port94formed on a lateral portion of bit shank12.

REFERENCES:
patent: 4096917 (1978-06-01), Harris
patent: 4254838 (1981-03-01), Barnetche
patent: 4359111 (1982-11-01), Gonzalez
patent: 6892828 (2005-05-01), Rives

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