Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1988-11-29
1990-02-13
Massie, Jerome W.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
384 95, E21B 1022
Patent
active
048998389
ABSTRACT:
An earth boring bit having a body and a cantilevered bearing shaft extending inwardly and downwardly from the body. A rotatable cutter with an open end is assembled over the shaft, which has a journal surface formed around a longitudinal axis. The cutter has a bearing surface sized to permit assembly over the journal surface of the shaft. At the open end of the cutter bearing surface is a seal recess which includes an intersecting wall that defines an annular, generally curved corner to oppose the journal surface of the shaft. The cutter bearing surface has a curved outer region that converges from the annular corner of the seal recess into an inner region to reduce the stress the corner induces upon the journal bearing surface of the shaft, including the stress induced by cutter cocking during drilling.
REFERENCES:
patent: 3397928 (1968-08-01), Galle
patent: 4157122 (1979-06-01), Morris
patent: 4516641 (1985-05-01), Burr
patent: 4554985 (1985-11-01), Backlund
patent: 4753304 (1988-06-01), Kelly, Jr.
"Ball Bearing Journal", pp. 2-24, Jun. 1987.
Burr Bruce H.
Sullivan Eric C.
Felsman Robert A.
Hughes Tool Company
Massie Jerome W.
Melius Terry Lee
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