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 operating in the mode of slipping at which the maximum volume of drilled-out rock for the whole cycle of bit operation by means of maintaining of high-quality grading of a face surface is achieved, is determined from a ratio depending on the radius of a rolling cutter rim and an angle between two neighbouring teeth of the rolling cutter rim.

EFFECT: improving a bit operating efficiency.

2 dwg