CALIBRATOR Russian patent published in 1999 - IPC

FIELD: bore-hole drilling technology. SUBSTANCE: calibrator has body and calibrating blades which are made in the form of circular segments. These segments by their front ends as to direction of calibrator rotation are rigidly connected with double-stage rotation axles which are eccentrically displaced relative to plane which crosses longitudinal axis of body. Degree of eccentricity is adjustable. At rear ends as to direction of calibrator rotation, blades are hard-faced by hard-alloy cutting teeth, and blades are hard-faced atop with continuous wear-resistant layer of tungsten carbide or titanium. EFFECT: widened calibrator versatility in application. 3 cl, 2 dwg