DRILL BIT Russian patent published in 2013 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: drill bit comprises a hollow body with working elements and a central nozzle with a circular ledge on the outer surface and channels for a scrubbing agent, and the nozzle is installed in the body cavity onto bearings. The central nozzle is equipped with guide blades for development of torque directed against the bit rotation. Guide blades may be installed on detachable rings installed in the cavity of the central nozzle and rigidly fixed to it.

EFFECT: increased efficiency of bit operation, improved bottom-hole cleaning from sludge.

2 cl, 1 dwg