ROLLING CUTTER OF DRILL BIT Russian patent published in 1997 - IPC

FIELD: bore-hole drilling equipment. SUBSTANCE: this is used for cutting large-diameter bore-holes, primarily by reactive-turbine method of drilling. Rolling cutter of drill has annular corner bore 6 in rear surface 5 of rim 2. One side 7 of bore 6 in axial section of each tooth in combination with plane aligned with rear surface 5 creates acute angle. Apex of acute angle is located at point of crossing this plane with generant of working edge 4. Value of acute angle can be within 5-20 deg. EFFECT: high efficiency. 1 cl, 1 dwg