AN APPARATUS AND METHOD FOR CONTACT-LESS SWITCHING

An apparatus and method for use with a railroad dragging equipment detectin g (DED) system (102) that detects objects hanging from and dragged beneath a train as the train travels along rails (108) of a railroad track (109). A generator (202) supplies a first signal and is coupled to a magnetic ampl...

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Bibliographische Detailangaben
1. Verfasser:	BALLINGER, FORREST HENRY
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ENSURING THE SAFETY OF RAILWAY TRAFFIC GUIDING RAILWAY TRAFFIC MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PERFORMING OPERATIONS PHYSICS RAILWAYS TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	An apparatus and method for use with a railroad dragging equipment detectin g (DED) system (102) that detects objects hanging from and dragged beneath a train as the train travels along rails (108) of a railroad track (109). A generator (202) supplies a first signal and is coupled to a magnetic amplifier coil (132) to form a magnetically variable impedance circuit (200). The magnetic amplifier coil (132) is responsive to the first signal to create a circuit impedance in series with a detection circuit (210). A magnet (205) is mechanically connected to the cam/follower system (208) and is positioned near the magnetic amplifier core (206) for varying a circuit impedance of the detection circuit (210). A detection circuit (210) generates a second signal as a function of variations in circuit impedance. A controller (206) is responsiv e to the second signal for activating an alarm (128) when the magnet (205) moves relative to the magnetic amplifier coil (132).