Class 246/34B - Coded circuits

Subclass of Class 246 - Railway switches and signals
No. of patents: 35
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
7268565	System and method for detecting rail break/vehicle A system for detecting a rail break or train occupancy includes a current source adapted to deliver a current to an isolated block of a rail track. A voltage sensor is coupled to the isolated block and configured to detect voltage across the isolated block. A shunt ...	09/11/2007
7245993	Railway system with at least one track, and method for encoding data for transmission over the track A railway system with at least one track having at least two rails and a method for encoding data for this railway system are disclosed. Railway signaling systems are located proximate to the tract for controlling railway cars moving along the rails. The railway sys...	07/17/2007
7226021	System and method for detecting rail break or vehicle A rail break or vehicle detection system includes a plurality of voltage sources, each coupled to one of the plurality of zones. A plurality of resistors are provided, each coupled in series with one of the plurality of voltage sources. A plurality of current sensor...	06/05/2007
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
6494409	Railway code following apparatus A solid state code following track relay receives pulsating rail current from a railway code transmitter. The track relay includes first and second inputs structured to receive the rail current. Two Hall effect digital current sensors each have a coil and...	12/17/2002
6374165	Railway information transmission method and system In a railway information transmission method and system wherein information is transmitted by a consecutive transmission mode between on-vehicle control equipment and ground control equipment, a redundant code which is updated in accordance with a predete...	04/16/2002
6317664	Train detection system and a train detection method A train detection system, including a transmitter, to be connected to a track circuit, which transmits to the track circuit a train detecting signal for confirming the existence of a train in the track circuit, a receiver, to be connected to the track cir...	11/13/2001
6230086	Railway information transmission method and system In a railway information transmission method and system wherein information is transmitted by a consecutive transmission mode between on-vehicle control equipment and ground control equipment, a redundant code which is updated in accordance with a predete...	05/08/2001
5820081	Process and circiuit arrangement for the transmission of digital control data The invention concerns a process and a circuit arrangment to transmit digital control data, preferably between a central station and individual locomotives of a model railway. In order to make possible an association between transmitters and receivers wit...	10/13/1998
5769364	Coded track circuit with diagnostic capability A track circuit with diagnostic capability differentiates between an occupied track circuit and one in which a conductor of the track circuit (one of the rails) is broken. Transceiver units are provided at the respective ends of the track circuit and oper...	06/23/1998
5720454	Audiofrequency track circuit with data transmission (digital TC); transceiver interface A track circuit is used in a railway plant or the like, and comprises a track segment which is isolated electrically from the adjacent segments by electrical splices which consist of a conductor connecting the rails in the shape of an "S" laid flat in the...	02/24/1998
5711497	Cab signaling apparatus and method The invention provides for a cab signaling apparatus and method for use on board a railway vehicle propelled on a set of spaced rails by a traction motor. The cab signaling apparatus may reduce a noise component within a signal having a primary cab signal...	01/27/1998
5507456	Reduced harmonic switching mode apparatus and method for railroad vehicle signaling A signaling apparatus that includes a transmitter having a step-square wave generator for generating a signaling waveform, which waveform is composed of a plurality of square wave signals, and which has an information signal encoded thereupon. The apparat...	04/16/1996
5485977	Reduced harmonic switching mode apparatus and method for railroad vehicle signaling A signaling apparatus that includes a transmitter having a step-square wave generator for generating a signaling waveform, which waveform is composed of a plurality of square wave signals, and which has an information signal encoded thereupon. The apparat...	01/23/1996
5465926	Coded track circuit repeater having standby mode A coded railway track circuit apparatus is disclosed having the capability of operating during periods of low vehicle activity in a reduced power standby mode. This is accomplished by switching circuitry which interrupts power to most of the components wi...	11/14/1995
5330134	Railway cab signal An improved railway cab signal transmitter for transmitting a cab signal onto a pair of rails for reception by a railway vehicle on said rails. A tuning arrangement is connected across the rails to generally resonate with the leaving end impedance bond at...	07/19/1994
5330135	Railway track circuits A railway track circuit system is described, in which there is a transmitter 15,16 and receiver 19,20 at each end of a track circuit section 4. Each receiver receives signals from the transmitter at the opposite end of the section and the received signals...	07/19/1994
5271584	Pulse code railway signalling system A railway signalling system uses coded electrical information signals to convey vital signal information to wayside signal locations. The coded information signals are in the form of unipolar three-pulse DC signals capable of being sent or received during...	12/21/1993
5263669	Railway cab signal transmitter A transmitter for transmitting cab signal and track signal currents to a pair of rails includes the circuitry for mitigating runby currents which are not fully shunted by the rail vehicle. High runby currents at the leaving end of a block are reduced by s...	11/23/1993
5219426	Single-element coded alternating current railway track circuit having double-element, phase-selective capability The invention provides a single-element coded alternating current railway track circuit which may be adapted to a double-element Phase-Selective configuration. A transmitter, via a transmitter transformer, provides a coded track signal to the track. A rec...	06/15/1993
4732355	Rate code decoding system In railway signaling systems which transmit rate code signals along track circuits, which signals are picked up by the trains and used for signaling purposes, such as speed control, the rate code signals of the same repetition rate received when the train...	03/22/1988
4720067	Method for increasing the number of signals which may be transmitted from a ground station to a rail vehicle To increase the number of different signals which may be transmitted from a ground station provided with a coder (17) to a rail vehicle (1) provided with a decoder (18) and being on a rail section connected to the station, the transmission is carried out ...	01/19/1988
4619425	Pulse code system for railroad track circuits An alternating current code, alternately transmitted in each direction through the rails of a railroad track section, includes a selected number of pulses of alternately positive and negative polarity similar to a bi-polar DC code. Data is transmitted by ...	10/28/1986
4582279	Modulation system for railway track circuits A modulation system for railway track circuits in which a modulated signal is applied to a section of track for the purpose of detecting the presence or absence of a train on the section. Such circuits are used to control signalling and they are vital to ...	04/15/1986
4494717	Vital transmission checking apparatus for communication channels Vital transmission checking apparatus is disclosed for a communication channel which transmits quasi-static signals representing several alternative states of a function, e.g., the control function for a signal in a railway control system, one of which st...	01/22/1985
4437632	Reset apparatus for railroad track circuits The two inputs of a first flip-flop (FF) are alternately energized over a pair of opposite contacts of a code transmitter. Outputs of a second FF alternately enable a pair of logic gates to pass first or second output pulses of the first FF as clock pulse...	03/20/1984
4432517	Circuit for detecting unbalance of the traction current in a track circuit In order to prevent a false signal being given in a circuit arrangement for detecting the presence of rolling stock on a track section, when a rail is grounded or fractured, a detecting circuit (31) is provided for detecting unbalance of the traction curr...	02/21/1984
4417229	Means for use on a railroad to distinguish between traction current and signal current Means for differentiating between traction current and signal current in an electrified railroad includes a first input transformer providing an input signal of the same frequency and phase as the track signal current. A second input transformer is connec...	11/22/1983
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
4320881	Fail-safe decoder for digital track circuits A selected unique digital comma-free code word is transmitted through track section rails from one end and, when received at the other end, is applied serially to a shift register which supplies a parallel readout of shifting pattern to one input of a fai...	03/23/1982
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
4015082	Multi-channel signal decoder A signal decoder is disclosed for use in a transportation vehicle control system in which vehicle control signal information bits are transmitted according to a multiple message frequency, FM, PSK, or FSK, comma-free binary coded command signal. The discl...	03/29/1977
3992698	Fail-safe speed command signal decoder In a typical transportation vehicle control system, coded control information is transmitted to the transportation vehicles on vehicle command signals comprised of multiple message frequencies. A decoder is disclosed for decoding, in a fail-safe manner, i...	11/16/1976

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Class 246/34B - Coded circuits