CONE DRILLING BIT Russian patent published in 2001 - IPC

FIELD: drilling equipment. SUBSTANCE: drilling bit has leg axles carrying movably secured rolling cutters with continuous wedge-shaped teeth rows on main cones and intermittent on periphery. Tooth wedge angle α in cross-section of teeth row corresponds to interval α = 44-58 deg. Cone drilling bit with continuous wedge-shaped teeth rows on drilling cutters in drilling of medium-hard and hard friable rocks ensures multiple increase of sizes of drilled rock particles (cuttings) as compared with bits having on teeth rows longitudinal milled teeth. Sharp increase of penetration rate. EFFECT: higher efficiency of cone drilling bit operation. 3 cl, 3 dwg