Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1988-06-23
1990-02-27
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175371, 277 92, 384 94, 384 95, E21B 1020, E21B 1022
Patent
active
049037862
ABSTRACT:
An earth boring bit having an improved two piece bearing and seal assembly containing a cantilevered bearing lug that is threaded to receive a mating bearing sleeve, the lug having a transverse shoulder intersected by a mouth on the sleeve to define a bearing shaft upon which is supported a rotatable cutter. A lubrication system includes a hydrostatic pressure compensator and seal means, the transverse shoulder being positioned inwardly of the seal means toward an inner end region of the lug to avoid exposure of the transverse shoulder of the lug and the mouth of the bearing sleeve to ambient drilling fluid. The seal means is a rigid face seal assembly which includes a rigid, sealing ring and a resilient energizer ring.
REFERENCES:
patent: 1634318 (1927-07-01), Bull
patent: 1884965 (1932-10-01), Bagget
patent: 4176848 (1979-12-01), Lafuze
patent: 4478299 (1984-10-01), Dorosz
patent: 4516641 (1985-05-01), Burr
patent: 4572306 (1986-02-01), Dorosz
patent: 4600064 (1986-07-01), Scales et al.
patent: 4666001 (1987-05-01), Burr
patent: 4671368 (1987-06-01), Burr
patent: 4753303 (1988-06-01), Burr
Dang Hoang C.
Felsman Robert A.
Hughes Tool Company
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