ROTARY DRILLING BIT (VERSIONS) Russian patent published in 2008 - IPC E21B10/16 

FIELD: building.

SUBSTANCE: invention concerns drilling tools, namely rotary drilling bits. The drilling bit includes a case and a cone-shaped self-cleared cutter with peripherical gear and disk tips. Teeth of a gear tip have the T-shaped form with cross-section part located perpendicularly, and a longitudinal part with a skew against a longitudinal axis of the cutter; the longitudinal part at the next teeth is inclined against a longitudinal axis of the cutter in opposite sides. In the other variant of the rotary drilling bit design, the disk tips are reinforced by diamonds, and gear wreaths - with hard-alloy compacts of cuneal form, cutting edges of the cuneal teeth being turned relative to one another at an angle of α=360/n, where n is quantity of inserts on a tip.

EFFECT: increased efficiency and productivity of drilling due to enhanced penetrating of a drilling bit and higher mechanical speed of drilling.

4 cl, 4 dwg