Class 246/34CT - Continuous track

Subclass of Class 246 - Railway switches and signals
No. of patents: 44
Last issue date: 04/15/2008

Number	Title	Issue Date
7357359	Electronic code follower relay An electronic code following relay for use in a railroad signaling system includes a timing circuit for receiving an input square wave signal coded at a pre-determined code rate, and regenerating the input square wave signal at the pre-determined code rate after a p...	04/15/2008
7258309	Automatic and guided system for transporting people and method for controlling transport modules running in such a system A system for automatic and guided transport of people, the system including: at least one running track having guide members for guiding transport modules; an electric power supply system comprising a sequence of power supply blocks; electric self-propelled transpor...	08/21/2007
7198235	Method and apparatus for the transmission of information between track and vehicle of a model railroad A method and apparatus for the transmission of information between a track (11, 12) and a vehicle (13, 14) located on the track in a model railroad system, whereby when electrical contact between the vehicle and track, such as between a wheel of the ve...	04/03/2007
7200470	Train detection system and a train detection method A train detection system includes transmitters receivers connected to a track circuit for transmitting and receiving a train detecting signal to and from the track circuit, and a control device on the ground, which transmits the train detecting signal to the transmi...	04/03/2007
7027897	Apparatus and method for suppressing mechanical resonance in a mass transit vehicle A mass transit vehicle traction motor control system includes an automatic control block for receiving and processing a tachometer signal having a first resonance signal superimposed thereon to produce a rate request signal having a corresponding second resonance si...	04/11/2006
7006012	Automatic train stop system In an automatic train stop system in which a track circuit 3 is divided into track circuit sections 1T, 2T and 3T, and a digitized train control information telegram (ATS telegram) 8 is transmitted through the track circuit section...	02/28/2006
6592081	Electronic code generating circuit for use in railroad signaling systems An electronic code transmitter is disclosed for driving a number of code following relays of a railroad signaling system. The electronic code transmitter comprises a timing circuit and a driving circuit. The timing circuit generates, at a predetermined co...	07/15/2003
5459663	Cab signal apparatus and method An apparatus and method for supplying cab signal to a rail vehicle on a section of track composed of sequentially adjacent railway track circuit blocks. Respective receivers of each track circuit block are monitored for the presence of a vehicle within th...	10/17/1995
4878638	Combination frequency loop coupling for railway track signalling An audio frequency (AF) track circuit whereby a railway track tuned loop transmitter operating in a dual resonant mode, for handling, two signal frequencies, can be coupled to the rails. Each frequency is conducted through a tuning unit having series and ...	11/07/1989
4766817	Electric power supply system for railway train A railway system including a track and a train adapted to run on the track. A power feed line comprising a series of feed sections is provided to extend along the track. A plurality of stations are provided along the track and the station has a power supp...	08/30/1988
4728063	Railway signalling system especially for broken rail detection Broken rail detection in a block of track without the need or expense of conventional signalling uses a chain of transmitters and receivers connected to the rails and defining sections of the block between the ends of the block. Either cyclically at a pre...	03/01/1988
4723739	Synchronous rectification track circuit An improved audio frequency track circuit system utilizes a synchronous train detection arrangement and reduces the number of fixed code rate modulated carrier signals. As few as two carrier signals are alternately applied at discrete points along a pair ...	02/09/1988
4641803	Track circuit A railway track circuit arrangement particularly suitable for the short track circuit, down to approximately 40 metres, required in metro transit systems. Based on conventional A.C. track signalling principles for continuous track rails, the boundaries be...	02/10/1987
4636933	Power control circuit with digital pulse width control A bridge network 1 of current switching devices 2, 3, 4, 5 is operated in full wave manner by controlling signals A, B, C, D respectively produced by two similar, parallel and pulse width modulated power control circuits 12, 13 connected to receive a comm...	01/13/1987
4469298	Axle sensor A sensor arrangement is disclosed for detecting the presence of an axle of a rail vehicle in a short length of a track. The arrangement includes a bridge coupled to and including resistances of the rail upon which the vehicle travels. This bridge is unbal...	09/04/1984
4442988	Information transmission device through the rails between a railway track and a vehicle assembly circulating on this track An improvement in apparatus for the secure transmission of information through rails in zones of propagation independent from the sections of the track block-section system embodying the use of series resonant circuits tuned to the information carrier fre...	04/17/1984
4420133	Device for the transmission of information through the rails between a railway track and a group of vehicles running along this track A system for transmitting data long rails of a railway track for reception by a receiver mounted on a vehicle of the train. The system includes resonance circuits defining contiguous zones which are independent of a block system of the railway track. An i...	12/13/1983
4415134	Hall effect track circuit receiving element A railroad signal circuit includes a transmitter and a receiver which have a common connection to the track rails at one end of a signal block. There will be a similar transmitter and receiver at the opposite end of the signal block. A transmit/receive sw...	11/15/1983
4392625	Circuit arrangement for a track circuit with multiple signal sources A track circuit is disclosed and includes rails which are fed from a main signal transmitter and which rails, at an information point a required distance from the transmitter, are shunted by a cross impedance, with which impedance, with respect to the tra...	07/12/1983
4392626	Vital protection arrangement for railroad track circuits A tuned transformer element has its primary winding coupled, in series with a fuse of preselected rating, to the rails of the track circuit. A secondary winding supplies input energy to the track circuit receiver unit which detects occupancy conditions of...	07/12/1983
4373691	Decoupling arrangement for non-insulated AC track circuits in railway systems A decoupling arrangement for non-insulated track circuits is disclosed wherein the receiving circuit of the evaluating unit for the AC track currents is electrically separated from the traction-current-carrying parts of the track. The cross bonds between ...	02/15/1983
4369942	Signal control system A railroad signal system includes an A type transmitter and receiver for sending and receiving signal messages in one direction and a B type transmitter and receiver for sending and receiving signal messages in the opposite direction. The A transmitter an...	01/25/1983
4365777	Train approach detector A train approach detector uses frequencies in the audio spectrum to activate grade crossing protection devices in advance of and during the presence of railroad trains at grade crossings. The detector is completely solid state, and includes one transmitte...	12/28/1982
4354649	Arrangement for continuously controlling track-bound vehicles An arrangement enabling continuous control of vehicles on a track divided into individual areas comprises at least one track-conductor loop associated with the track in each of the areas having N transpositions therein, where N is an integer greater than ...	10/19/1982
4352475	Audio frequency track circuit for rapid transit applications with signal modulation security An audio frequency track circuit with improved security in the train detection function for rapid transit applications for use with uninsulated rails includes an improved transmitter and receiver. The transmitter modulates a track frequency carrier with a...	10/05/1982
4324376	Railroad highway crossing warning system A railroad highway crossing warning system including pickup coils for sensing current flowing in the track rails of an approach zone, a circuit for sensing the voltage across the track rails, band-pass filter circuits for filtering the voltage and current...	04/13/1982
4320880	Electronic track current switching relay system An electronic system which emulates the operation of a polar relay for applying coded pulses to railway tracks has separate signaling circuits having signaling devices responsive to a separate inputs which provide operating power to the circuits. The circ...	03/23/1982
4314306	Signal-powered receiver A self-powered receiver including a series resonant circuit tuned to the carrier frequency of a modulated carrier signal. A demodulator for detecting the envelope which switches a switching transistor ON during the mark portions of the modulator carrier s...	02/02/1982
4306694	Dual signal frequency motion monitor and broken rail detector A highway crossing warning system for monitoring the motion and predicting the time of arrival of an approaching train at the highway crossing and for detecting the presence of a broken rail in the approach zone by feeding dual frequency signals into the ...	12/22/1981
4304377	Electrical block separating joints for railway signaling systems An electrical joint for separating adjacent block circuits of a railway signaling system in which the rails of the railway track serve as conductors. The upstream circuit block carries first frequency signals and the downstream block circuit carries secon...	12/08/1981
4187504	Fault monitoring and indicator system A continuity monitor and indicator circuit for monitoring the continuity of a segment of a pair of control conductors along which a control current flows includes capacitors at each end of the segment being monitored, which capacitors are connected to bri...	02/05/1980
4149690	Positive-response transit detector for a given transit zone An electronic track zone detecting device for providing a signal representing location and direction of travel of a railway apparatus within the zone. The detecting device comprises two frames, of insulated open conductive loop structures, defining the ex...	04/17/1979
4118750	Vital relay operating circuit There is disclosed a circuit for energizing a vital relay in response to an input signal that is modulated between two frequencies. A discriminator circuit responds to the modulated frequencies and alternately produces an output patented of one polarity a...	10/03/1978
4108404	Arrangement for protecting data communication in a continuous automatic train control system A system for protecting data communication against disturbances caused by unsymmetrical standing waves along track conductors wherein automatically controlled terminating resistors are utilized to prevent the formation of standing waves either totally or ...	08/22/1978
4099692	Transfer apparatus for energy sources First and second monitoring channel apparatus detect the level of the normal output and load current, respectively, supplied by a principal energy source to a variable load network. Source output varies from normal to low level and load current from low t...	07/11/1978
4074879	Track signalling system A track circuit signalling system for an electrified rapid transit system using significantly fewer components is provided. Instead of a transmitter and receiver at each track circuit boundary, alternate boundaries have transmitters only; and the intermed...	02/21/1978
4066229	Device for preventing traction power harmonic interference on high frequency track circuits An overlay selective harmonic transducer device is installed on affected track circuits, that is, track circuits on which interference with normal functioning has occurred due to traction power harmonics....	01/03/1978
3974991	Railroad motion detecting and signalling system with repeater receiver A first transmitter-receiver movement detector system operable at a first frequency detects a train approaching a first grade crossing or other track location in response to train approach speed and distance, and a repeater receiver movement detector devi...	08/17/1976
3955785	Electrical protective circuits A detective circuit for railway points composed of three track sections connected together at a junction or for a railway crossing composed of four track sections connected together at a junction. The detective circuit comprises an ac generator adapted to...	05/11/1976
3951364	Track circuit There is described a track circuit for use with a track section which may or may not include a switch. The system detects the presence of a railroad vehicle within the track section as it constitutes a shunt across the track. The track section is divided ...	04/20/1976

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Class 246/34CT - Continuous track