ROLLING DRILLING BIT Russian patent published in 2014 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: rolling drilling bit includes a housing with a trunnion, on which a rolling cutter with a concave spherical vertex reinforced with rock-destructing teeth is installed by means of bearings. Rock-destructing teeth are removable and have a swelling on the shank; the top part of the rolling cutter has channels for arrangement of removable teeth, and the end face of the trunnion has several concentric rows in the form of cam rims interacting with shanks of removable teeth.

EFFECT: improving a bit operating efficiency.

3 cl, 2 dwg