Refuge device from high place
AssigneeKabushiki Kaisha Sato Seisakusho
InventorToshiaki Sato
Life of this patent
Estimating the term…
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.
Claims2
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.
Dependencies are inferred from the claim text.