ROLLING DRILLING BIT Russian patent published in 2015 - IPC E21B10/18 

FIELD: mining.

SUBSTANCE: rolling drilling bit comprises the housing with the central step channel, the branch pipe from elastic material fixed on the rolling cutter legs and placed in the central channel the output end of which is fitted with a nozzle placed on internal surface, and on external surface - with the bushing. The space between legs is blocked by partitions the internal surface of which forms together with internal sides of legs the closed ring surface contacting in working position with external surface of the bushing of the flexible branch pipe.

EFFECT: improving a bit operating efficiency.

2 dwg