E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/12
E21B 4/02 (2006.01) E21B 4/00 (2006.01) F16C 17/04 (2006.01)
Patent
CA 1241635
ABSTRACT OF THE DISCLOSURE DRIVE DEVICE FOR A DRILL BIT A drive device for driving a drill bit for drilling bore holes in underground formations comprises a tubular housing for attachment to a drill string with a rotary drive means in the housing arranged to be driven by fluid forced through the housing. The rotary drive means driv- es an output shaft for connecting to a drill bit, the output shaft being supported by at least one axial bear- ing which comprises a continuous bearing ring and a re- taining ring carrying a plurality of bearing segments which are swivellingly mounted to provide for a spacing of reducing cross-section between the bearing surfaces so that relative rotation of the bearing ring and bearing segments causes fluid to flow into the space and build up a hydrodynamic lubricating film.
493213
Daenicke Heinrich
Kruger Volker
Eastman Christensen Company
Gowling Lafleur Henderson Llp
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