Continuous Patents (Class 246/63C)
  • Patent number: 5496003
    Abstract: A system for transmitting data between the ground and moving vehicles, for example consisting of a stretch of railway line V.sub.1 having beacons between the rails. The various beacons are connected to nodes, e.g. N.sub.i, N.sub.j, N.sub.k, which are in turn linked to a nodal transmission point (CNT) and to fixed railway installations controlling, for example, a points motor. The system is useful particularly in the field of data transmission between the ground and moving railway vehicles such as locomotives, passenger coaches, freight wagons, and train units.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: March 5, 1996
    Assignee: Societe Nationale des Chemins de fer Francais
    Inventor: Patrice H. Bernard
  • Patent number: 4723739
    Abstract: 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 of jointless track rails to define the transmitter ends of the track sections, with complementary receivers defining the opposite ends. The two carrier signals are coded at one of two phase angles which are out-of-phase so that, when assigned, the nearest possible interfering signal is out-of-phase and is rejected thereby. Like carrier frequency transmitter/receiver arrangements are disposed on opposite sides of an insulated joint but are coded out-of-phase so that a breakdown of the insulated joint is detected and the false code signal is rejected.
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: February 9, 1988
    Assignee: American Standard Inc.
    Inventor: Raymond C. Franke
  • Patent number: 4420133
    Abstract: 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 insulative conductive loop is placed between the rails of the track and proximate the resonance circuits. An AC generator and modulation are provided to produce a modulated carrier frequency corresponding to the data to be transmitted and is coupled to the conductive loop. The receiver is positioned at the front of the train when the conductive loop is positioned near the downstream side of each zone and toward the rear of the train when the conductive loop is positioned toward the upstream side of each zone relative to the direction of train travel.
    Type: Grant
    Filed: March 17, 1980
    Date of Patent: December 13, 1983
    Assignee: Jeumont-Schneider
    Inventor: Michel J. Dietrich
  • Patent number: 4354649
    Abstract: 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 two, the loop communicating data between the vehicles and a fixed control station by being coupled at opposite ends thereof to a different one of two supply units coupled to the control station and by being inductively coupled to communicating equipment on the vehicles. The one loop further comprises coupling elements disposed intermediate adjacent ones of the N transpositions to subdivide the loop into N track-conductor loops.
    Type: Grant
    Filed: January 3, 1980
    Date of Patent: October 19, 1982
    Assignee: International Standard Electric Corporation
    Inventors: Eduard Murr, Siegfried Gersting, Helmut bel, Alan C. Knight
  • Patent number: 4352475
    Abstract: 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 fixed code rate, regardless of the code rate employed to modulate the train information frequency. The receiver includes a decoder tuned to the track frequency modulation rate. By using such a sharply tuned decoder, the noise protection threshold is increased. Because of its application to uninsulated rails, with the associated lack of hard track circuit boundaries, adjacent track circuits have different track frequency modulation rates to insure that the modulated track frequency signal, from one track circuit, is not effective to operate a track relay in another circuit even under failure conditions.
    Type: Grant
    Filed: May 23, 1980
    Date of Patent: October 5, 1982
    Assignee: General Signal Corp.
    Inventors: Barry L. Smith, James R. Hoelscher
  • Patent number: 4325101
    Abstract: A fail-safe electronic time delay circuit for providing a predetermined time delay period having an emitter-follower amplifier connectable to a source of recurrent signals, a voltage doubling rectifier for rectifying the amplified recurrent signals and for charging a capacitor which powers a tickler coil transistor oscillator, a pair of complementary switching transistors which are alternately rendered conductive by the a.c. oscillations of the transistor oscillator, a rectifier having a capacitor which is charged when one of the pair of complementary switching transistors is conductive and which is discharged through a vital relay when the other of the pair of complementary switching transistors is rendered conductive.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: April 13, 1982
    Assignee: American Standard Inc.
    Inventor: Reed H. Grundy
  • Patent number: 4235402
    Abstract: The present invention relates to a train vehicle speed control apparatus which recognizes a change in one of the acceleration rate or the deceleration rate of a train moving along the track and the control of the train velocity in relation to what distance will be required for a desired operation of the train such as a predetermined decrease in the train speed or a stopping of the train. If the deceleration rate has changed, for example, the fixed physical system limits what control can be exercised and the velocity of the train can be modified to adjust the actual stopping distance used by the train or with a fixed stopping distance desired then the permitted train velocity can be changed.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: November 25, 1980
    Assignee: Westinghouse Electric Corp.
    Inventors: Thomas C. Matty, Howard N. Miller
  • Patent number: 4165850
    Abstract: A safety device for a transport system in which a vehicle travels on a track divided into sequential sections operates to stop the vehicle when a parameter representing the motion of the vehicle exceeds a threshold in the course of travelling over a track section. The device comprises two comparators each delivering during passage of the vehicle in each track section a comparison signal having a first value when the parameter remains within the threshold and a second value when the parameter exceeds the threshold. A coincidence detector is connected to receive the output signals of the two comparators and operates to initiate emergency braking of the vehicle if the output signals of the two comparators do not simultaneously have the same value during travel in a track section.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: August 28, 1979
    Assignees: Regie Autonome des Transports Parisiens, Inter-Elec
    Inventor: Jean-Claude Dubreucq
  • Patent number: 4103851
    Abstract: A method and apparatus for continuous supervision of both a vehicle's speed and deceleration over a track, provides overspeed detection in one set of conditions and under-deceleration detection under other conditions. The apparatus does not provide automatic driving, but is used in conjunction with either automatic driving equipment or manual driving of the vehicle. The process involved comprises the steps of transmitting to the vehicle an exit speed, defined as a speed limit to be observed on leaving a particular block section of the track upon which the vehicle travels. The exit speed is stored in the vehicle, and comparisons are made with a stored exit speed for the preceding block section. The process further includes a continuous measurement of both actual speed and deceleration of the vehicle, and provides for initiation of emergency braking dependent upon the results of the comparison and measurement steps.
    Type: Grant
    Filed: December 22, 1976
    Date of Patent: August 1, 1978
    Assignee: Jeumont-Schneider
    Inventor: Jean P. Salmon
  • Patent number: 4081160
    Abstract: A method and apparatus is provided for communicating information in the form of plural items of data between a first station and a rail vehicle by transmission of pulses at predetermined repetition rates along railway tracks including a transmitting station for generating the information pulses having control apparatus receiving a particular data item as an input for selecting a repetition rate to represent the data item for transmission and generating apparatus connected to the control apparatus for generating the information pulses. The information pulses are coupled to railway tracks which transmit the generated information. A receiving station receives the information pulses from the tracks and includes sensing apparatus for sensing the information pulses and apparatus for removing interference signals received along with the information pulses, the interference signals being attributable to a number of causes which include unbalanced traction return currents and/or transmission interference.
    Type: Grant
    Filed: September 28, 1976
    Date of Patent: March 28, 1978
    Assignee: Jeumont-Schneider
    Inventors: Robert C. Devy, Jean P. Salmon
  • Patent number: 4065081
    Abstract: Alternating current track circuits are provided for the several adjoining track sections of a stretch of railway track, each of the track circuits comprising an alternating current code transmitter and an alternating current code receiver connected to track rails at opposite ends of the associated section. Circuit apparatus including an alternating current line circuit extending along the stretch of railway track is provided for normally communicating alternating current from the line circuit through rails of the associated track sections, the alternating current being modulated at a selected rate code and current in any two adjoining track sections being of opposite instantaneous polarity for broken down joint protection. Phase sensing apparatus is provided at a receiving end of each track section including a comparator for comparing the rate code modulated alternating current communicated through the track rails with a steady reference source connected to the line circuit.
    Type: Grant
    Filed: December 9, 1976
    Date of Patent: December 27, 1977
    Assignee: General Signal Corporation
    Inventors: Jerry P. Huffman, John P. LaForest, William A. Petit, James A. Smith
  • Patent number: 4053128
    Abstract: A stretch of railway track, has a high frequency track circuit transmitter and receiver and a cab signal transmitter coupled across track rails at each of several locations marking the ends of track sections along a stretch of railway track. Each location has an impedance bond having a primary winding connected across the track rails and having toroid secondary windings tuned to assigned distinctive high frequencies for coupling a track transmitter and a track receiver to the track rails. A loop circuit is also provided at each location, including a tuned loop, for inductively coupling a cab signal code transmitter to the track rails independent of the impedance bond. The tuned toroid coils and the loop circuit are connected in series to one end of a two wire line circuit, which, at its other end, is connected to a track circuit high frequency transmitteer, a track circuit receiver, and a cab signal transmitter connected in multiple.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: October 11, 1977
    Assignee: General Signal Corporation
    Inventors: Klaus H. Frielinghaus, Clinton S. Wilcox
  • Patent number: 4002314
    Abstract: The present invention relates to a train vehicle speed control signal providing apparatus operative with a frequency command speed control signal, and relates to the generation of the desired speed code signals in such a frequency rate system. Two separate and independent physical and electrical operations provide each of the respective desired frequency speed code signals in combination with a comparison step to provide an output speed code signal only if the two input frequency signals are each at the desired frequency.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: January 11, 1977
    Assignee: Westinghouse Electric Corporation
    Inventor: Isaac R. Barpal
  • Patent number: 3979091
    Abstract: A communication system for track or guideway operated vehicles is disclosed. The system is adapted for two-way transmission between a vehicle and a wayside station and is provided with a transmission line of special configuration along the wayside. The transmission line comprises three conductors each having a wave configuration with the waves disposed in three-phase relationship and a return conductor which is also of wave configuration. The vehicle transmitter section is provided with an inductive loop which is coupled with the transmission line and is energized with a continuous wave signal. This produces signals on the three phase conductors which have an envelope frequency proportional to vehicle speed and a phase relationship corresponding to the relative position of the wave configurations of the phase conductors. Thus, vehicle speed may be derived by measuring frequency and vehicle position may be derived by counting cycles or pulses from a given starting point.
    Type: Grant
    Filed: June 6, 1975
    Date of Patent: September 7, 1976
    Assignee: Otis Elevator Company
    Inventors: Forrest W. Gagnon, Arthur H. Marsh
  • Patent number: 3973746
    Abstract: A collision avoidance system adapted for railroad use comprising a track having connected thereto a plurality of first signal transmitters exciting the track by a first control signal within a first frequency bandpass range and a plurality of second signal transmitters interspaced between the first signal transmitters in an alternating arrangement, such second transmitters exciting the track by a second control signal within a second frequency bandpass range. While the first and second control signals are respectively within the first and second bandpass range, individual ones thereof are separated by frequency increments from the other control signals within the corresponding bandpass range such that any beats therebetween are of a relatively high frequency.
    Type: Grant
    Filed: May 2, 1975
    Date of Patent: August 10, 1976
    Assignee: Walt Disney Productions
    Inventor: Kenneth H. Ball