ROLL-FORMED SECTION FOR SHAFT LINING Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: roll-formed section for shaft lining has symmetric chute with flanges. Smaller chute is made on the bottom of the above chute and orientated towards the flanges. The flanges are equipped with walls arranged in parallel to the walls of the smaller chute forming external chutes. Width of the bottom of external chutes is equal or larger than that of the chute bottom between its walls and the walls of the smaller chute. EFFECT: enhanced reliability of shaft lining. 3 cl, 2 dwg