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1. WO2002058983 - SYSTEME DE DETECTION DE POINTES SANS CONTACT POUR AIGUILLES DE CHEMIN DE FER

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is

1. A contactless detection system for detecting the movement of the switch points of a railroad switch comprising:

a transformer for detecting or sensing the position of the switch points, the transformer having a core linked to the switch points, and further having a primary coil means and a secondary coil means wound around the core; and

an electronic interface means for receiving signals from the secondary coils responsive to, and corresponding with, the positioning of the switch points.

2. A contactless detection system as defined in Claim 1 , wherein the primary and secondary coil means have a plurality of coils.

3. A contactless detection system as defined in claim 1 wherein the two secondary coils are wound in opposite directions.

4. A contactless detection system as defined in claim 1 , further comprising a source for providing a signal to the primary coil.

5. A contactless detection system as defined in claim 4, in which a switch machine is operative for moving the switch points.

6. A contactless detection system as defined in claim 1 , further comprising a control device connected to the signal output of the interface means.

7. A contactless detection system as defined in Claim 1 , wherein the transformer is a linear variable differential transformer.

8. A contactless detection system as defined in claim 7 in which the transformer means is mounted directly to the switch points.

9. A contactless detection system as defined in claim 3, in which there is a 180° phase shift between the output voltages of the two secondary coils such that as the core moves, the voltage amplitude of one secondary coil increases while the voltage amplitude of the other secondary coil decreases, whereby if the core is in the center of the transformer means, the voltage amplitudes of the two secondary coils will be equal.

10. A contactless detection system as defined in claim 9 in which the absolute value of one secondary coil voltage plus the absolute value of the other secondary coil voltage is a constant whereby this constant value is a vital check signal, and means for sensing that the vital check signal is constant.

11. A contactless detection system as defined claim 1 , further including means for providing failsafe operation of the system, said means including means for comparing a current voltage value with a previous voltage value from the output of the transformer means wherein the current voltage value must be within allowable limits, otherwise, the system is shut down.

12. A controller detection system as defined in claim 1 comprising means for providing fail-safe operation of the system, said means including means for modulating an input signal to the primary coil of the transformer at a specific frequency, and means for recognizing the absence of the frequency as the presence of a failure, and in response thereto, for shutting down the system.