Engineered Safety Solutions in Mine Hoisting. Horne Conveyance Safety is a world leader in cage and skip chairing and in impact energy absorption. Levelok chairing systems overcome rope-stretch problems when hoisting heavy materials and ore in underground mines. The Emergency Fall Arrest System (E-FAS) provides safe deceleration in the event of an uncontrolled fall of a cage (safety dog). Technogrid systems arrest conveyances in over-wind conditions in a head frame, or counterweights on belt conveyors, and other areas where unexpected impact absorption is needed. GoPro Guide Rollers provide a more stable ride of conveyances extending guide roller life.