ANCHOR Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: anchor has bar with limiting ring and wedge conical head, anchoring half-sleeve, supporting plate, tension nut. Anchor has spring in form of flexible bracing plates with unbent ends. The latter are secured to outer walls of lower ends of half-sleeves. Plate ends are bent at angle of 50-55 deg. and interval between ends exceeds the well diameter. EFFECT: higher efficiency. 3 dwg