ROLLING DRILLING BIT Russian patent published in 2010 - IPC E21B10/08 

FIELD: mining.

SUBSTANCE: invention concerns rock destruction tool, and namely small-diametre rolling drilling bits. Rolling drilling bit includes legs with trunnions on which there installed are cutters mounted by means of ball bearing locked with a retaining bearing. Coordinate of locking pin axis in vertical plane in its upper part - h is determined by mathematical formula.

EFFECT: increasing operating efficiency of the bit owing to more reliable attachment of cutters with locking pins and at maintaining strength characteristics of the whole support in small-sized rolling bits.

2 cl, 2 dwg