DRILLING BIT Russian patent published in 2016 - IPC E21B10/38 E21B10/60 

FIELD: mining.

SUBSTANCE: invention relates to a drill bits designed for drilling, preferably hard rocks. Drill bit comprises a housing with flow channels and hollow carbide inserts, working ends of which have a toroidal shape, and their cavities are linked with cavity of body. In body there are ejection channels linking cavity of body with cavity of carbide inserts, wherein a portion of body below ejection channels is made in shape of a cylinder on which there is a seal assembly.

EFFECT: technical result consists in improvement of efficiency of drilling bit.

2 cl, 3 dwg