ROCK DRILL BIT Russian patent published in 2015 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: drill bit comprises legs with inclined pins with shifted in plan axes, installed on them conic rolling cutters with milled, casted or hard-alloy teeth located in parallel or at an angle to the generatrix of the rolling cutter, and flushing assembly. The size of slipping of rolling cutter teeth at which the maximum volume of drilled-out rock by each cutting structure tooth during the whole period of operating time of a bit is achieved, is pre-determined by relations depending on the mode of a braking or slipping, rolling cutter rim radius, a angle between two neighbouring teeth of a rolling cutter rim.

EFFECT: improving a bit operating efficiency.

3 dwg