Rope deterioration detection
AssigneeOtis Elevator Company
InventorsMasafumi Okawa, Fumio Nakai
Life of this patent
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Abstract
A method for detecting deterioration of a plurality of wire ropes is provided. Each of the wire ropes extends over a conductive sheave in parallel. The wire ropes define a measurement length extending between one end of the wire ropes and contact points of the wire ropes with the conductive sheave. The method comprises measuring the resistance through a conductive path passing through the measurement lengths of two of the wire ropes and the conductive sheave and detecting the deterioration of the wire ropes from the measured resistance.
Claims16
A method for detecting deterioration of a plurality of wire ropes, each of the wire ropes extending over a conductive sheave in parallel, the wire ropes defining a measurement length extending between one end of the wire ropes and contact points of the wire ropes with said conductive sheave:
- the method comprising,
- measuring the resistance through a conductive path passing through the measurement lengths of two of the wire ropes and said conductive sheave;
- and
- detecting the deterioration of the wire ropes from said measured resistance.
A rope deterioration detection device for detecting deterioration of a plurality of wire ropes extending over a conductive sheave in parallel, comprising:
- a measuring instrument attached to one end of the wire ropes for measuring the resistance of a plurality of conductive paths including the measurement length of two of the wire ropes and said conductive sheave, said measurement length extending between the one end of the wire ropes and contact points of the wire ropes with said conductive sheave;
- and
- a controller for determining the resistance of each wire rope from the measured resistance of the plurality of conductive paths.
Dependencies are inferred from the claim text.