ROLLER CUTTER DRILLING TOOL Russian patent published in 2015 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: roller cutter drilling tool includes a housing with a central blowdown channel, legs with roller cutters installed on a free rotation axis. Roller cutters are provided with rock-destructing elements in the form of teeth and/or pins forming central and peripheral (with a gauge edge) structure with similar number of rock-destructing elements, with a similar pitch of their installation on each of the roller cutters. External shape of the roller cutters has sections without circular symmetry relative to their rotation axis. Central structure at the cone vertex of roller cutters is formed with core-destructing elements in the form of blades having an elongated shape in radial direction relative to roller cutter rotation axes, offset in the same direction relative to the same axes and oriented between each other according to location of the rest sections of roller cutters without any circular symmetry relative to the same axes.

EFFECT: reducing labour intensity and providing safety of mutual orientation of roller cutters.

3 dwg