HARD-ALLOY INSERT Russian patent published in 2017 - IPC E21B10/56 

FIELD: mining.

SUBSTANCE: hard-alloy insert contains a cylindrical shank, a working head connected to the shank by a conical portion, and an insert fixing assembly with the drill bit body. The lateral surface of the shank is made with at least two annular grooves, made in the frontal plane in the form of a truncated cone. The cylindrical section between the annular grooves is divided by inclined grooves into several sectors, the end faces of which on the side of the working head are made with saw-edged teeth.

EFFECT: providing high reliability of fastening in the body of the drilling tool.

2 dwg