DRILLING BIT Russian patent published in 2006 - IPC E21B10/62 

FIELD: rock-cutting tools, particularly drilling bits adapted to perform full-diameter drilling.

SUBSTANCE: drilling bit comprises body with connection thread, flushing channels, grooves and working surface made as concentric rings reinforced with rock-cutting members and divided into parts with concentric grooves. Cross-sections of the concentric grooves have extended parts shaped as equal sided trapezes. Major base of each trapeze faces connection thread. The grooves are provided with rod-like core breakers with drive. The core breakers are arranged in axial channels, which connect body interior with annular groove bottoms, and may cooperate with the drive. Any well-known submersed percussion mechanisms, for instance hydraulic and pneumatic strikers, may be used as the drive. Core breakers have lengths exceeding that of the channels and wedge-like working surfaces. Sides of the wedge-like working surfaces are parallel to annular groove sides. Flushing channels and flushing grooves are formed for face cleaning of borings. The flushing channels connect drilling bit body interior with annular groves. The flushing grooves divide the annular concentric rings into separate sectors.

EFFECT: decreased energy inputs and drilling costs.

4 cl, 2 dwg