ROCK-DRILLING BIT Russian patent published in 2014 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: rock-drilling bit comprises a body with a channel for a cleaning agent and a journal with a spherical end, on which a mill is installed by means of a lock bearing and a roller frictionless bearing with an inner spherical surface that responds to the end of the journal and rock-breaking elements on crowns separated by sludge-removing slots. The mill is made with radial channels, where detachable rock-breaking elements are placed, tails of which in the plane parallel to the axis of the journal are made with a convex end and are installed as capable of interaction with side surfaces of roller bearings, the external surface of some of them contacting with convex ends of tails of detachable rock-breaking elements, are made with a responding concave shape. Detachable rock-breaking elements may be installed at the sharp angle to the mill radius. The part of detachable rock-breaking elements may be installed on crowns of mills, and some - in sludge-removing slots. Tails of detachable rock-breaking elements in the plane parallel to the axis of the journal may be made in the form of barrel-shaped cylinders or spheres.

EFFECT: higher efficiency of bit operation.

4 cl, 2 dwg