DRILLING BIT WITH WEDGE JOINT OF CUTTERS Russian patent published in 2016 - IPC E21B10/48 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and is intended for drilling exploration wells in rocks of different strength, reducing its strength at temperatures higher than 300-600°C. Drilling bit with wedge joint comprises body with connection thread, sectors made at crown housing and separated by flushing channels, installed in slots well-forming and core-forming inserts with negative leading angle in plan to side of inner and outer surfaces and negative cutting angle to bottom of well. Inserts are made in form of quadrangles of impact-resistant material, and grooves are provided with L-shaped plates, which have arc-shaped and straight ends. Arc-shaped ends of plate on side of nonworking face of cutter forms a support and is attached, for example, by soldering or welding to housing of bit, and straight end is brought into flushing channel and crushed by wedge to front wall of channel with cutter by pressing latter to housing of bit. Wedge and walls of flushing channels are made with skew angle which provides self-braking in both Morse cone, wherein walls of flushing channels at base are made with saw cut parallel to edges of plates-cutters, and above wedge retainers are attached by welding, soldering or deformation of wall of channel slot with sagging above wedge.

EFFECT: technical result consists in improvement of reliability of attachment of cutters in crown housing, longer life.

1 cl, 2 dwg