Method and apparatus for retaining roller cone of drill bit

Details Method and apparatus for retaining roller cone of drill bit Method and apparatus for retaining roller cone of drill bit

1988-07-21

1989-10-17

Kisliuk, Bruce M.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175371, 384 95, 384 96, 76108A, E21B 1020, E21B 1022, B21K 502

Patent

active

048740470

ABSTRACT:
An improved apparatus and method for rotatably mounting and retaining a rock bit roller cone on a journal of a drill bit is disclosed. The bit body has at least one depending leg with an outer free end and an inner end continuous with the remainder of the bit body, and the cone surrounds the leg adjacent the outer end, forming an annular space between the leg and the cone. At least two retention bearing sleeves are disposed in the space: a first fixed to the leg and rotatable relative to the cone; and a second, disposed longitudinally inwardly of the first, fixed to the cone and rotatable relative to the leg. The retention bearing sleeves cooperate to prevent relative movement of the second sleeve longitudinally past the first.

REFERENCES:
patent: 4145094 (1979-03-01), Vezirian
patent: 4157122 (1979-06-01), Morris
patent: 4266622 (1981-05-01), Vezirian
patent: 4350060 (1982-09-01), Vezirian
patent: 4511008 (1985-04-01), Brunson
patent: 4572306 (1986-02-01), Dorosz
patent: 4738323 (1988-04-01), Mathews

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