Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1985-04-29
1986-12-02
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
384 96, E21B 1022
Patent
active
046258167
ABSTRACT:
A boring drill bit comprises a shank having one end attached to a drill pipe; a plurality of inclined pins extending from the other end of the shank radially and at an inclination toward the ground with respect to the center line of the shank; a plurality of roller cutters mounted rotatably on the inclined pins, respectively. Each of the inclined pins is formed to have a cylindrical side face and has its diameter gradually decreased continuously from the end portion to the root thereof. Each of the plain bearing members, which is divided into a plurality of parts in the axial direction and which is mounted around corresponding inclined pin, has an inner face which engages rotatably substantially all over the surface with the cylindrical outer face of the inclined pin and if necessary, all over the inner face of an opening of the roller cutter which is fitted on the outer circumference of the plain bearing members. The corresponding roller cutters and plain bearing members are made immovable relative to each other in the axial direction by the action of a holding mechanism.
REFERENCES:
patent: 2104819 (1938-01-01), Schlumpf et al.
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 4098358 (1978-07-01), Klima
patent: 4156470 (1979-05-01), Bodine et al.
patent: 4157122 (1979-06-01), Morris
patent: 4181377 (1980-01-01), Oelke
patent: 4266622 (1981-05-01), Vezirian
patent: 4533003 (1985-08-01), Bailey et al.
Bagnell David J.
Novosad Stephen J.
Sumitomo Metal Mining Company Limited
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