Elevator rope slip detector and elevator system

Elevator – industrial lift truck – or stationary lift for vehicle – With monitoring – signalling – and indicating means

Reexamination Certificate

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Details

C187S393000, C073S158000, C073S763000, C073S828000

Reexamination Certificate

active

07614482

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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U.S. Appl. No. 10/580,837, filed May 26, 2006, Shiratsuki, et al.

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