ROCK-DESTROYING DRILLING TOOL Russian patent published in 2010 - IPC E21B10/46 

FIELD: mining.

SUBSTANCE: invention relates to a rock-destroying drilling tool of the cutter type, mainly - with diamond curing structure. The rock-destroying drilling tool includes a housing in the sockets whereof chisels with diamond hardmetal plates (DHP) are installed an fixed to prevent turning with pins counteracting with the shanks of the chisels and installed in the housing through radial channels. A peculiarity of the proposed tool consists in the pin having an end groove on the outer surface with their end pieces equipped with DHP mounted so that to enable contact with the well walls and the core. The through channels in the housing are done with circular grooves that, when matched with the pin grooves, form a cavity for split spring-loaded bushings for the pins fixation to prevent their lateral motion. The end grooves of the housing through channels and the spring-loaded split rings are designed in the form of response trapezoids in the longitudinal section with the trapezoids major bases turned towards the pin axis.

EFFECT: improved efficiency of the rock-destroying drilling tool operation.

2 cl, 3 dwg