DRILL BIT ROLLER CUTTER Russian patent published in 2017 - IPC E21B10/22 

FIELD: mining engineering.

SUBSTANCE: bit has a body with inclined trunnions, on which roller cutters are mounted and fixed by means of split rings located in combined recesses of the trunnions and roller cutters, and equipped with a blocking unit including mounting rods and fixing pins located respectively in axial and radial channels of the trunnion. The mounting rods are installed for turning around the longitudinal axis, t-shaped, which transverse part with larger diameter is made with flats, and the longitudinal part of the rod with smaller diameter is located in the axial channel of the trunnion with an outlet to the outer surface of the body. The flats are made with different sizes.

EFFECT: improved bit operation efficiency.

2 dwg