DRILLING BIT Russian patent published in 2012 - IPC E21B10/60 

FIELD: construction.

SUBSTANCE: invention relates to a rock-breaking tool, namely, to drilling bits of a cutting type. The bit comprises a body with a connection thread, a working head with washing channels and a matrix separated into separate sectors by washing slots connected to washing channels and brushes with drives installed in them, as well as a circular lock and a tail. On the bottom of the washing slots there are additional slots for placement of brush tails in them, which are installed there as capable of radial displacement along washing slots, at the same time the drive for radial displacement of brushes is arranged in the form of a compression or extension spring, rigidly connected at one side to a circular lock of brushes, and at the other side - to a working head. Some brushes in washing slots are arranged asymmetrically relative to their longitudinal axis.

EFFECT: improved efficiency of operation of a drilling bit due to improved cleaning of a bottomhole from sludge.

3 cl, 2 dwg