Refuge device from high place
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United States of America Patent
Stats
-
Jun 8, 2004
Grant Date -
Jul 24, 2003
app pub date -
Dec 31, 2002
filing date -
Jan 24, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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