ROTARY-PERCUSSION DRILLING BIT Russian patent published in 2006 - IPC E21B10/26 

FIELD: drilling equipment, particularly rock-cutting drilling bit to perform rotary-percussion drilling.

SUBSTANCE: drilling bit comprises body reinforced with hard-alloy plate-like insert, two vibratory means arranged directly above insert ends or peripheral body part. Vertical vibratory means axes are transversal to longitudinal insert axis in vertical plane. Drilling bit has two segmented channels each formed of one side insert walls and inner cylindrical body surface in central part thereof and communicates with central flushing channel. Vibrator means have different track lengths and different dimensions of members moving along the tracks.

EFFECT: increased drilling rate.

2 cl, 3 dwg