Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1979-04-30
1981-04-21
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
308237R, 175371, E21B 1030, E21B 1022
Patent
active
042627605
ABSTRACT:
A drilling fluid roller reamer-stabilizer includes a tubular body having threaded pin and box connectors at each end adapted to be connected in a drill string and providing a fluid passage connecting the upper part of the drill string with the lower part. Rollers having integral pins at their ends are mounted in pockets in the sides of the body. The pins extend into holes in arcuate cross section bearing blocks received in correlative sockets in the body at the ends of the pockets. Each block makes an interference fit with the sockets in the body. Tool access passages allow a tool to be inserted behind each block to drive or pry it out. Slotted, resilient bearing sleeves are provided in the holes in the blocks where the roller pins are received. The sleeves extend beyond the holes toward the rollers to take axial thrust. Flanges on the ends of the sleeves provide additional thrust area.
REFERENCES:
patent: 1174568 (1916-03-01), Griffin
patent: 1466137 (1923-08-01), Mead
patent: 1669268 (1928-05-01), Swoyer
patent: 1837423 (1931-12-01), Foster
patent: 3820613 (1974-06-01), White
patent: 3881791 (1975-05-01), Hentschel
patent: 4182425 (1980-01-01), Garrett
Allison Glenn L.
Justman Daniel B.
Winship Thomas E.
Conley Ned L.
Favreau Richard E.
Leppink James A.
Robinson Murray
Rose David Alan
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