Earth boring bit with protected seal means

Details Earth boring bit with protected seal means Earth boring bit with protected seal means

1991-05-31

1992-07-14

Novosad, Stephen J.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

With fluid pressure-actuated feed means

175371, 175372, 384 94, E21B 1022, F16C 3376, F16J 1550

Patent

active

051294710

ABSTRACT:
An earth boring bit having a body, pressure compensating lubricating system and cantilevered bearing shaft with an annular seal surface and a radial seal surface. A cutter is rotatably secured to the bearing shaft, with an annular seal recess having radial and cylindrical seal surfaces to oppose the seal surfaces on the body and bearing shaft to define a seal gland. A resilient and annular packing ring is compressed between the cylindrical seal surfaces, but has a length less than the minimum length of the gland. A shroud extends inwardly near the outer backface a selected distance behind the packing ring to bias it inwardly. The shroud extends inwardly toward the bearing not more than about 30% of the cross-sectional thickness of the O-ring in the relaxed condition. The O-ring is compressed in a range of about 10 to 15 percent.

REFERENCES:
patent: 3397928 (1968-08-01), Galle
patent: 3449024 (1969-06-01), Lichte
patent: 3765495 (1973-10-01), Murdoch et al.
patent: 4014595 (1977-03-01), Dolezal
patent: 4209890 (1980-07-01), Koskie, Jr.
patent: 4372624 (1983-02-01), Neilson
patent: 4516641 (1985-05-01), Burr
patent: 4554985 (1985-11-01), Backlund
patent: 4623028 (1986-11-01), Murdoch et al.
patent: 4727942 (1988-03-01), Galle et al.
patent: 4753304 (1988-06-01), Kelly, Jr.

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