ROCK-BREAKING TOOL Russian patent published in 2017 - IPC E21B10/16 E21B10/36 E21B10/43 

FIELD: mining.

SUBSTANCE: rock-breaking tool has a body with holes in which there are inserts with conical shanks and a working head fixed by means of intermediate bushings. The shanks and intermediate bushings are provided with mating conical surfaces. The inner diameter of intermediate bushings decreases from shanks of inserts to their working head. Longitudinal through grooves are made on conical surface of intermediate bushings on the side facing shank direction having a conical shape in the frontal plane. The length of each longitudinal through groove is less than length of intermediate bushings. The short grooves are interleaved with long ones.

EFFECT: increased tool efficiency.

2 dwg