E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/12
E21B 4/02 (2006.01) E21B 4/00 (2006.01)
Patent
CA 1161425
ABSTRACT The invention is concerned with a bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through the housing and coupled at one end to the motor, a thrust bearing com- prising a plurality of races and rings arranged co- axial about the shaft, and a radial roller bearing the outer races of which are formed by the races of the thrust bearing and the inner races of which comprise peripheral grooves formed in the surface of the shaft, and a tool mounted on the other end of the shaft,
359877
Baldenko Dmitry F.
Gusman Moisei T.
Semenets Valery I.
Swabey Ogilvy Renault
Vsesojuzny Nauchno-Issledovatelsky Institut Burovoi Tekhniki
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