DRILLING BIT OF CUTTING TYPE Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: this relates to rock crushing tools of cutting action and can be used for drilling holes in quarries and opencast mines and in geological prospecting operations. Bit has body with ribs, axles fixed in ribs, and cutting disks mounted on axles. Plane of cutting faces of disks is located at angle to diametrical plane of body. Cutting disks are installed eccentrically relative to axles by means of bushes with possibility for changing distance between axles of rotation of cutting disks for drilling holes of different diameters depending on rock hardness factor. Eccentric bushes are connected with axles by means of spline joints. Axles are secured on ribs by spline joints. EFFECT: high efficiency. 2 cl, 4 dwg