ROCK DRILL BIT Russian patent published in 2015 - IPC E21B10/16 E21B10/18 

FIELD: mining.

SUBSTANCE: rock drilling bit includes the paws with inclined pins, installed on them multicone rolling cutters with cast or milled teeth, peripheral ones of which are positioned slant with reference to the longitudinal axis of the rolling cutter, and pressure head flushing assemblies placed between rolling cutters. All other rims of rolling cutters are also designed with bevel teeth, and teeth of peripheral rims have the left raising direction of the generatrix helical line of the obtrusion site at execution of drilling by rotation of a bit clockwise, and right - at rotation of a bit counterclockwise, and teeth of other rims are inclined to the opposite side. Axes of hydromonitor nozzles of flushing assemblies are facing towards the space between peripheral and adjacent rim.

EFFECT: higher efficiency of bit performance due to high-quality cleanup of well bottom from sludge by optimisation of its evacuation to annular space.

2 cl, 2 dwg