CONE BIT Russian patent published in 2006 - IPC E21B10/08 

FIELD: drilling equipment, particularly cone bits.

SUBSTANCE: cone bit comprises body with flushing channel and cutters installed one into another and having axes angularly displaced from bit body axis in opposite directions. The drilling bit is provided with bush having toothed crown on lower end thereof. The bush is spring-loaded relative the body in axial direction. Lower bush end cooperates with upper end of outer cutter having mating toothed crown. Body cooperates with bush by spline connection. Flushing system of drilling bit has axial channels arranged in the body and inner cutter, as well as radial channels formed in inner cutter.

EFFECT: increased mechanical drilling speed.

4 cl, 2 dwg