DIAMOND ONE-CUTTER DRILLING BIT Russian patent published in 2013 - IPC E21B10/16 E21B10/52 

FIELD: mining.

SUBSTANCE: diamong one-cutter drilling bit comprises a body with a journal of a leg for placement of a support, a thread for connection to a drilling string, a system of channels for a washing fluid, a reservoir and a system of compensation of lubricant consumption during drilling, one cutter being movably fixed on a tight bearing support and having channels on the outer surface for passage of the washing fluid and rock-breaking cutting elements. The cutting elements are cutters with flat working ends, sharpened cutting edges and a cylindrical base. The main part of cutters is arranged on an approaching side of washing channels, having an opening angle corresponding to angles of cutters meeting rock, at the same time a leading side of channels has angles of opening within the limits of β=55°÷72°.

EFFECT: higher mechanical speed of drilling, resistance of armament and tunneling per bit.

9 dwg