SHOT DRILL BIT Russian patent published in 2011 - IPC E21B7/16 E21B10/00 

FIELD: mining.

SUBSTANCE: drill bit comprises a body with arched slots on its side surface and slots that divide the body end into sectors reinforced with cutting elements installed under the arched slots. A working edge of the cutting elements in plan is formed by at least two blades installed at the blunt angle one to each other. Besides, the blade at the side of the core is inclined (displaced) to the side opposite to the direction of the bore bit rotation. At the same time the point of blades crossing is arranged on the radius corresponding to the radius of arched slots distance from the body axis. The cutting elements may be arranged both in the form of a single plate with a convex front face and also in the form of separate plates.

EFFECT: improved efficiency of the drill bit operation and thus improved performance parametres of its operation.

3 cl, 2 dwg