Elevator rope slip detector and elevator system

Details Elevator rope slip detector and elevator system Elevator rope slip detector and elevator system

2004-05-28

2009-08-25

Benson, Walter (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

C187S393000, C073S158000, C073S763000, C073S828000

Reexamination Certificate

active

07578373

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. A rope sensor for measuring the movement speed of the rope is provided in the hoistway. 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 speed detecting portion for obtaining the speed of the car based on information from the rope 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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