DRILLING BIT Russian patent published in 2017 - IPC E21B10/43 

FIELD: mining.

SUBSTANCE: drilling bit contains a hollow body with inclined blades reinforced with rock-destruction elements and a washing channel. Each blade is provided with a cylindrical channel to accommodate rock-destruction elements, made in the form of balls, and external and internal grooves connected thereto, the internal one communicates with the washing channel, and the external groove has width less than the balls diameter.

EFFECT: improvement efficiency of the drilling bit.

3 cl, 3 dwg