DRILL BIT FOR HARD ROCKS, DRILLING RIG AND PERCUSSION DRILLING OF HARD ROCKS Russian patent published in 2015 - IPC E21B10/38 E21B10/60 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to percussion drilling of rocks. Drill bit comprises head to be secured at drilling rig drill element end in diameter larger than that of said drill element. Drill bit front end is shaped to truncated cone composed by the ring extending over the perimeter. Said ring is equipped with multiple gage teeth spaced apart over ring length for contact with material to be destructed. Central flushing channel extending the drill bit head has at least one flushing bore exposed at front end for feed of flushing medium to front end. At least one peripheral flushing bore extends from at least one flushing opening in said ring. Said flushing channel comprises section terminated at peripheral flushing bore and directed to force flushing medium to the spot on material in contact with gage tooth during the next percussion of drill bit. Note here that flushing fluid is directed to the shaft drilled in tocks. Note here that at least two peripheral flushing bores open in said ring.

EFFECT: higher rate of drilling.

16 cl, 13 dwg