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 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 bit is equipped with a detachable bushing with longitudinal slots on the outer surface installed on the journal and fixed relative to it from slipping, and the mill is made with radial channels, in which detachable rock-breaking elements are placed with capability of axial displacement, and their tails in the plane parallel to the axis of the journal are made with the convex end and are installed as capable of interaction with the outer surface of the detachable bushing. Detachable rock-breaking elements in the plane perpendicular to the axis of the journal 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 half-cylinders.

EFFECT: higher efficiency of bit operation.

4 cl, 2 dwg