ANCHOR Russian patent published in 2004 - IPC

FIELD: mining industry.

SUBSTANCE: device has bar, in which from the side of locking end an axial aperture is made changing to guiding groove. It passes along side surface of bar and has spiral shape with raise angle no more than 30° and depth, smoothly decreasing from lock end. Spreader balls are mounted in axial aperture by fixer and rod with possible displacement in guiding groove after anchor is sent to well face. Support washer and tension nut are placed on the bar.

EFFECT: higher efficiency.

3 dwg