Abstract: A modified hole is simply fitted and retained to a rotary shaft so that a pulley may be coupled so as to be rotated together with the rotary shaft, in particular, pulley forming plates are coupled in a rotation preventing manner but slidably to the rotary shaft, an interval of a pulley groove may be formed to be variable with ease, even if the rope is loosened in an initial stage upon descending and so on and a rope has the minimum winding diameter at once due to the change in the pulley groove interval so that the rope is brought into pressing contact with the rotary shaft outer circumferential surface.

Abstract: A modified hole is simply fitted and retained to a rotary shaft so that a pulley may be coupled so as to be rotated together with the rotary shaft, in particular, pulley forming plates are coupled in a rotation preventing manner but slidably to the rotary shaft, an interval of a pulley groove may be formed to be variable with ease, even if the rope is loosened in an initial stage upon descending and so on and a rope has the minimum winding diameter at once due to the change in the pulley groove interval so that the rope is brought into pressing contact with the rotary shaft outer circumferential surface, the rope is hardly brought into contact with one corner edge, because of the easy slippage due to the number of convex and concave portions, it is possible to provide a novel refuge device from a high place which is superior in safety aspect and in which the local cutting force is hardly generated in the rope.