Elevator rope slip detector and elevator system
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United States of America Patent
Stats
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Nov 10, 2009
Grant Date -
Jan 4, 2007
app pub date -
May 28, 2004
filing date -
May 28, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an elevator apparatus, a pulley is provided in a hoistway. A rope that moves together with the movement of a car is wound around the pulley. Further, the pulley is provided with a pulley sensor for generating a signal according to the rotation of the pulley. The car is provided with a car speed sensor for directly detecting the speed of the car. A control panel is provided with: a first speed detecting portion for obtaining the speed of the car based on information from the pulley sensor; a second car speed detecting portion for obtaining the speed of the car based on information from the car speed sensor; and a determination portion for determining the presence/absence of slippage between the rope and the pulley by comparing the speeds of the car as respectively obtained by the first and second speed detecting portions.
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