Patent ID: 6745872
Filing Date: 2004-06-08
Classification: A62B

Abstract:
A refuge device from a high place in which a rotary shaft is provided rotatably within a casing provided with a rope winding portion around which a rope is wound feedably, a pulley for winding the rope to be fed is provided on the rotary shaft, static plates rotating within a closed chamber filled with oil and generating a brake force are provided on the rotary shaft, an interval of a pulley groove of the pulley is varied in response to a load to adjust the winding diameter, and a rope feeding brake mechanism for controlling so that the rope feeding velocity is kept substantially at the constant velocity irrespective of the magnitude of the load is provided, characterized in that an outer circumferential surface of the rotary shaft on which the pulley is provided and with which the rope is brought into contact while the winding diameter is at minimum upon the application of a large load is formed into a concave and convex outer circumferential surface formed by a number of circumferentially juxtaposed concave and convex stripes having a length in an axial direction and a modified hole identified with the concave and convex outer circumferential surface is fitted and retained to the rotary shaft whereby pulley forming plates of the pulley are coupled in a rotation preventing manner but slidably to the rotary shaft.