Railway switches and signals – Cab signal or train control – Magnetic rail
Patent
1980-03-17
1983-12-13
Groody, James J.
Railway switches and signals
Cab signal or train control
Magnetic rail
246 34CT, 246 63C, B61L 300, B61L 2100
Patent
active
044201338
DESCRIPTION:
BRIEF SUMMARY
A device for transmission of information, the propagation zones for the information signals of which are independent of the sections of the block system.
A generator 11 of alternating signals modulated at 12 by signals 13 to be transmitted is coupled to the lines of rails 1 and 2 by induction, by means of a winding 6 downstream of the zone. Each zone for transmission of information is bounded upstream and downstream by resonant circuits 4 and 5 tuned to the carrier frequency of the signals transmitted. This frequency is chosen so as to avoid any interaction between the track circuits and the device for transmission of information.
BACKGROUND OF THE INVENTION
The present invention refers to a device for the transmission of information through the rails between a railway track and a group of vehicles running in the same direction along this track over the length of which a plurality of zones for the transmission of information succeed one another.
Railway tracks and mainly those having heavy traffic are usually equipped with a block system, especially by track circuits, which in general employs the running rails as the path of transmission.
In modern equipment it has become necessary to have a device for transmission of information between the track and the vehicles. Such a device is capable of coexisting with the block system and, the whole system operating in a fail-safe manner in the railway sense of this term.
A known solution consists in transmitting the information by induction from a cable arranged in the track or along it, but this solution offers a certain number of disadvantages: the costs of the cable and the restraints which result from it in the maintenance of the track.
The employment of the running rails as the transmission path causes these disadvantages to disappear but comes up against two difficulties. The first difficulty arises.
From the fact that the running rails serve as the return circuit for the traction current with electrified lines and very often as the transmission path for the block signals.
Hence the signals of any system of transmission of information through the rails must be superimposed upon these existing currents and signals without disturbing them and must be able to be separated from them.
The difficulty is connected with the division of the track into blocks. This division must not affect the transmission of the information, of which the zones of transmission when this is effected by zones which succeed one another along the track, must be able to be demarcated independently of the sections of the block system.
SUMMARY OF THE INVENTION
The device in accordance with the invention enables one to free oneself of these difficulties because it employs for transmitting the information an alternating carrier wave modulated in frequency or in amplitude or in both and of characteristics such that its propagation in the rails is not affected by the return traction currents and by the block signals as well as by the device demarcating the blocks; further, it enables a demarcation of its own zones of propagation independently of the sections of the block system.
This device is characterized in that it includes: a generator of alternating signals at a predetermined frequency which forms the carrier frequency of the information to be transmitted this frequency being taken from outside the bands of frequency employed in the block system; modulated as a function of the information to be transmitted; the two lines or rails, near to the downstream end of the said zone for the transmission of information; which receives the modulated signals and the secondary of which is connected to the terminals of the loop-shaped winding; the two lines of rails, one to the downstream end and the other to the upstream end of the zone for the transmission of information; and carrier frequencies of the zones for the transmission of information.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood with the aid of some specific embodiment as illustrated in the drawings in whi
REFERENCES:
patent: 3390256 (1968-06-01), Clanton et al.
patent: 3450874 (1969-06-01), Whitten
patent: 3493741 (1970-02-01), Lubich
patent: 3543262 (1970-11-01), Hutton
patent: 3949959 (1976-04-01), Rhoton et al.
patent: 3974991 (1976-08-01), Geiger
Groody James J.
Jeumont-Schneider
LandOfFree
Device for the transmission of information through the rails bet does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for the transmission of information through the rails bet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the transmission of information through the rails bet will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-801295