Equipment for determining when synthetic fiber cables are ready

Details Equipment for determining when synthetic fiber cables are ready Equipment for determining when synthetic fiber cables are ready

1997-05-06

1998-11-10

Do, Diep N.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324539, 324543, 73158, 187226, G01R 3100, B66B 1108

Patent

active

058349421

ABSTRACT:
An apparatus for determining when a synthetic fiber cable for an elevator is ready for replacement is disclosed. The apparatus includes at least one voltage detection unit for detecting a voltage in at least one carbon fiber of the synthetic fiber cable and at least one threshold device for determining when the detected voltage exceeds a predetermined voltage threshold. The detected voltage is dependent upon the integrity of the portion of the synthetic cable and exceeding the predetermined voltage threshold is indicative of a failure of the at least one portion of the synthetic cable. The apparatus also includes a device for disabling the elevator when a predetermined number of the at least one threshold device determine that the at least one carbon fiber of the synthetic fiber cable has failed. The synthetic fiber cable includes a plurality of strand layers and at least one carbon fiber, each strand layer including a plurality of strands of synthetic fibers, such as aramide. The apparatus further includes a current source to be coupled to the at least one carbon fiber.

REFERENCES:
patent: 4803888 (1989-02-01), Choquet
patent: 5146611 (1992-09-01), Stolarczyk
patent: 5195393 (1993-03-01), Wolfington et al.
patent: 5262234 (1993-11-01), Minor et al.
patent: 5477152 (1995-12-01), Hayhurst
patent: 5565784 (1996-10-01), DeRenne
patent: 5566786 (1996-10-01), De Angelis et al.

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