ROTARY DRILL BIT Russian patent published in 2023 - IPC E21B10/42 E21B10/54 

FIELD: mining.

SUBSTANCE: invention relates to rotary drilling tools intended for drilling holes in coal mines for installing roof anchors, drilling holes, and also drilling wells. A rotary drill cutter includes a body, two carbide tungsten-cobalt cutting inserts with two stress raisers in the form of triangular angles, and a locking stage with the ability to attach the cutter to the drive mechanism. Carbide cutting tungsten-cobalt inserts are located on feathers that move along the axis of rotation of the body. The housing has a shaft that turns into a locking stage; a gear is located on the shaft, which engages with the satellites. The satellites are located on pins with the possibility of rotational movement of the pins around the axis of rotation of the housing shaft due to the rotation of the gear and satellites, the pins are installed vertically with one side in the blind hole of the glass, through a bearing communicating with the housing shaft, the pins are connected with their opposite side to the flat surface of the ring. The reverse side of the ring has a wavy surface that contacts the spherical surface of the feather pushers; the satellites are coupled with an internal gear, forming a planetary mechanism. The wheel is located in a blind hole of the cage and is fixed in it; the cage has holes for the guide pins. The corresponding holes for the guide pins are made in the housing, and to hold the holder on the housing shaft, a locking ring is installed. The housing has guide screws with the ability to hold pushers and feathers. The feathers have holes to accommodate the said screws.

EFFECT: reducing the wear of the cutting edges of the feathers, increasing the efficiency of drilling rocks of high hardness and expanding the scope of application of the drill cutter.

1 cl, 9 dwg