DRILL BIT Russian patent published in 2017 - IPC E21B10/56 E21B10/60 

FIELD: mining.

SUBSTANCE: invention relates to drilling equipment, in particular, to drill bit cutting structures. Drilling bit includes housing with holes, in which hard-alloy inserts with shank and working head are secured. In frontal plane working head is made in form of truncated cone, formed by toroid-shaped rings, which larger radius increases from top to shank, and their smaller radius is constant for all toroid-shaped rings. Insert Working head is made with recess, located along shank axis. Recess height has size, which is not less than working head height. Toroid-shaped rings side surface is made with several longitudinal grooves, located symmetrically relative to shank axis.

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

1 cl, 2 dwg