Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1988-01-11
1989-02-07
Bui, Thuy M.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175371, 384 95, F21B 1046
Patent
active
048025399
ABSTRACT:
A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a main journal bearing which is substantially frustoconically shaped and a main roller cone bearing which is reverse shaped to mate with the journal bearing. The journal and roller cone bearings comprise polycrystalline diamond. The invention also includes a member for retaining the roller cone on the journal.
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Cross Donald G.
Hall David R.
Bui Thuy M.
Smith International Inc.
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