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

FIELD: mining engineering.

SUBSTANCE: hard-alloy insert comprises of a cylindrical shank, working head, connected to each other by a conical section, and a unit of the insert fixing to the body of the drilling bit. The lateral surface of the shank includes at least two annular grooves filled with soft metal and having a triangular cross-section in the frontal plane. The cylindrical section between the annular grooves is formed with inclined grooves for interconnecting the grooves.

EFFECT: simplified process of the insert fabrication and high reliability of fixing in the drilling bit body.

5 cl, 2 dwg