DRILL BIT WITH BURIED TEETH AND DRILLING TOOL FOR ROCKY ROCKS FOR USE WITH SUCH DRILLING BIT Russian patent published in 2016 - IPC E21B10/36 

FIELD: mining.

SUBSTANCE: group of inventions relates to drill bits for impact drilling tools and to such tools. Drilling bit for impact drilling tools comprises drill bit head with front surface containing end surface, forming the most projecting forward of drilling bit head end surface, at least one hole in drilling bit head for arrangement of tooth. Drill bit comprises at least one recess on end surface, wherein recess is made larger than the hole, and hole is located in recess so that hole open end is located below the end surface. At that, drilling bit head includes calibrating portion surrounding the end surface, and recess, which is partially located in calibrating part. Drill bit also comprises at least one hole on end surface and flat tooth in the hole on end surface, at least one hole and tooth on calibrating surface in the hole on calibrating surface, and a tooth, in at least one hole, wherein most projecting portion of tooth is located below the most projecting part of one, at least, flat tooth in direction of drilling bit longitudinal axis and even from protruding or most projecting part of tooth on calibrating part.

EFFECT: technical result consists in increased bit service life and mechanical drilling speed.

13 cl, 5 dwg