DRILL BIT FOR DRILLING MOTHER ROCK Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: drill bit is intended for operation with rotation drive for making boreholes with wall. Drill bit has body consisting of basic part, template part and frontal part arranged around bit longitudinal axis. Multiplicity of diamond cutting members are stationary installed on frontal part and protrude from it. They are located at definite spacings from each other. Cutting members are so arranged that in process of drilling they create clear radial unbalanced force along vector of clear radial unbalanced force actually perpendicular to bit axis. Continuous zone of absence of cutting tool is located at template part around fulcrum, and supporting means are located in zone of cutting tool absence around fulcrum with purpose of continuous contacting with borehole wall in course of drilling. Cutting members are arranged so as to make clear radial unbalanced force keep supporting means in contact with borehole wall so that vector of clear radial unbalanced force has direction of balance and vector of clear radial unbalanced force returning in balanced position as reaction to disturbing displacement. EFFECT: high efficiency. 14 cl, 28 dwg