DRILL CONE BIT Russian patent published in 2011 - IPC E21B10/16 

FIELD: mining engineering.

SUBSTANCE: bit consists of claws with parallel set off inclined journals, of roller cutters with rims installed on journals by means of lock bearing; also, cast or milled teeth of cutters are arranged at angle to lengthwise axis of journal. Summary constituents of axial load onto each bearing unit of bore bit caused with force of rock destruction by rims of cutters with helical equipment at its slipping along face are similar by value and simultaneously are directed either from centre of bit rotation or to centre.

EFFECT: raised efficiency of drill bit operation by driving bore along specified direction.

2 dwg