DRILLING BIT Russian patent published in 2021 - IPC E21B10/38 

FIELD: mining and construction.

SUBSTANCE: invention relates to mining and construction - to drilling tools, is used when drilling holes in a shock-rotary way in hard rocks. The drill bit contains a body with cuttings grooves and with a central channel communicated with the side channels for the passage of the flushing agent to the bottom of the well, rock-cutting inserts installed in the body, and two cylindrical cutting bits fixed in the central leading stage of the body symmetrically relative to the axis of the body on the first diametric straight. On the second diametrical line, located perpendicular to the specified first diametrical line, a cylindrical core bit is installed near the body axis, the protruding height of which above the central leading step of the body is less than the protruding height of the two cylindrical cut teeth. The mouth of at least one of the said lateral channel for the passage of the flushing agent to the bottom of the well is made with an exit to the central advanced stage of the body in the annular zone of movement of the two cylindrical cutters. An additional flushing channel is formed in the body from the said central channel with an outlet to the central advanced stage of the body in the annular zone of movement of the cylindrical core bit.

EFFECT: reduction of abrasive wear of the drill bit.

4 cl, 3 dwg