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41. 发明授权

US3949959A Antenna apparatus for vehicle track rail signals 失效
标题翻译：天线装置用于车辆轨道信号
公开(公告)号：US3949959A
公开(公告)日：1976-04-13
申请号：US515746
申请日：1974-10-17
申请人： Richard S. Rhoton , David H. Woods
发明人： Richard S. Rhoton , David H. Woods
IPC分类号： B61L1/18 , B61L21/08
CPC分类号： B61L1/187
摘要： An antenna apparatus is disclosed for coupling audio frequency signals in relation to one or more vehicle track rails of a transit system for the purpose of determining vehicle occupancy of a given signal block and providing speed coded control signals to a vehicle moving along the track rail in that given signal block. It is desired that each signal block in the transit system track circuit operate with the signal level above a predetermined minimum signal level for reasons of vehicle occupational detection. The antenna apparatus is operative to enable desired adjustment of the signal level in a given signal block and in adjacent signal blocks relative to that given signal block.

42. 发明授权

US3901468A Logic backup for a train detection system in an automatic block system 失效
标题翻译：用于自动块系统中的火箭检测系统的逻辑备份
公开(公告)号：US3901468A
公开(公告)日：1975-08-26
申请号：US43849374
申请日：1974-01-31
申请人： HEWLETT PACKARD CO
发明人： COCHRAN DAVID S , CUTLER LEONARD S
IPC分类号： B61L23/14 , B61L1/18 , B61L21/06
CPC分类号： B61L1/181
摘要： The backup train detection system described herein distinguishes false from true block occupancies and recursively decides whether to set a true or a false occupancy latch whenever an occupancy indication from the primary detection system occurs. The decision to set a true occupancy latch somewhere in the system is a decision not to set the false occupancy latch in the block in which the indication occurs and is made on the basis of the states of all the true and false occupancy latches and occupancy situations throughout the system. The true occupancy latch in one block is reset if and only if the true occupancy latch in the next block is set. The false occupancy latch is reset by the absence of the occupancy indication in that block.

43. 发明授权

US3885228A Fail-safe electronic encoder for selectively operating railway signal indicator 失效
标题翻译：用于选择性操作的铁路信号指示器的失效安全电子编码器
公开(公告)号：US3885228A
公开(公告)日：1975-05-20
申请号：US36710973
申请日：1973-06-05
申请人： KATZ MARTIN J , GESUALDI WILLIAM A
发明人： KATZ MARTIN J , GESUALDI WILLIAM A
IPC分类号： B61L1/18 , H03B19/00 , H03K21/08 , B61L7/08
CPC分类号： B61L1/188 , H03B19/00 , H03K21/08
摘要： A fair-safe electronic encoder for selectively producing code tones having different frequencies for transmission to a frequency-responsive signal indicator. The encoder is composed of a high-frequency primary source whose output is applied through a first checking device to a programmable frequency divider whose operating ratio is selectable to produce any one of a plurality of code tones. The output of the frequency divider is fed to the output or driver stage through a second checking device. The first checking device transfers the output of the primary source to the divider only if the frequency thereof lies within a narrow tolerance range, whereas the second checking device transfers the code tone produced by the divider only if the frequency thereof has a proper value, whereby no output is yielded by the encoder should a defect arise in the primary frequency source, in the divider or in any other stage of the encoder.
摘要翻译：一种公平安全的电子编码器，用于选择性地产生具有不同频率的码音以传输到频率响应信号指示符。编码器由高频主要源组成，其输出通过第一检查装置施加到可编程分频器，其可操作比可选择以产生多个码音中的任何一个。分频器的输出通过第二检查装置馈送到输出或驱动级。第一检查装置仅在其频率处于窄公差范围内时将主源的输出传送到分频器，而第二检查装置仅在频率具有适当值时传送由分频器产生的码音，由此如果在主频率源，分频器或编码器的任何其他级中出现缺陷，则编码器不会产生输出。

44. 发明授权

US3781541A Fail-safe railroad-highway grade crossing protection system 失效
标题翻译：失效安全轨道高速等级交叉保护系统
公开(公告)号：US3781541A
公开(公告)日：1973-12-25
申请号：US3781541D
申请日：1972-09-07
申请人： WESTINGHOUSE AIR BRAKE CO
发明人： DARROW J , VAUGHN T
IPC分类号： B61L29/28 , B61L1/18
CPC分类号： B61L29/286
摘要： This disclosure relates to a fail-safe electronic system for protecting a railroad-highway grade crossing. The system includes a solid state transmitter for applying a constant current to the track and a solid-state receiver for obtaining a voltage signal from the track. A differentiating circuit senses any differential change between the track voltage and an opposing voltage in order to distinguish an approaching train from a receding train so as to appropriately control the warning apparatus. The integrity of the system is constantly monitored by modulating the track voltage signal so that the absence of the modulating signal activates the warning apparatus to ensure the highest degree of safety to pedestrians and motorists.

45. 再颁专利

USRE27472E Signal system for determining the presence of a train vehicle 失效
公开(公告)号：USRE27472E
公开(公告)日：1972-09-05
申请号：US27472D
申请日：1971-06-14
IPC分类号： B61L1/18
CPC分类号： B61L1/187
摘要： AUDIO FREQUENCY SIGNALS, OPERATIVE WITH TRACK CIRCUITS FOR THE PURPOSE OF SENSING THE PRESENCE OF A TRAIN VEHICLE IN ANY SIGNALING BLOCK CIRCUIT, ARE MODULATED FOR FAIL-SAFE SPEED CONTROL OF TRAIN VEHICLES AND FOR TRAIN OPERATION INFORMATION TRANSMISSION. THE TRAIN TRACK IS DIVIDED INTO SIGNALING BLOCKS OF PREDETERMINED LENGTH, WITH A VERY LOW IMPEDANCE SHORT CIRCUIT CONNECTION PLACED ACROSS THE TRACK RAILS AT THE ENDS OF EACH SUCH BLOCK. A SIGNAL TRANSMITTER OPERATING AT ONE OF SEVERAL AUDIO CARRIER FREQUENCIES, WITH ITS OUTPUT MODULATED AT A SUBAUDIO RATE, IS COUPLED TO THE RAILS ACROSS THE SHORT CIRCUIT CONNECTION AT ONE END OF EACH BLOCK.

ONE OR MORE COOPERATIVE SIGNAL RECEIVERS ARE COUPLED TO THE SHORT CIRCUIT CONNECTION AT THE REMOTE END OF EACH BLOCK, INTERMEDIATE RECEIVERS ARE COUPLED TO THE RAILS AS REQUIRED FOR DESIRED TRAIN CONTROL.

46. 发明授权

US3576991A Track circuit pickup unit 失效
标题翻译：跟踪电路拾取单元
公开(公告)号：US3576991A
公开(公告)日：1971-05-04
申请号：US3576991D
申请日：1969-01-23
申请人： MARQUARDT IND PRODUCTS CO
发明人： WILSON HARLAN J
IPC分类号： B61L1/18 , B61L21/00
CPC分类号： B61L1/187
摘要： Apparatus is described which detects the presence of a train within a given area. The apparatus includes a sensing unit which comprises an iron core transformer vertically positioned between the rails of a railroad track. A single-loop primary winding is coupled across the track. A secondary winding of the transformer is coupled to a receiver. At least one transmitter is coupled to the track at a predetermined distance from the sensing unit. The receiver detects secondary voltage induced by the track voltage applied to the primary winding. The wheel and axle of the train, when approaching the given area between the selected transmitter and the receiver, from the receiver end causes current to flow in the rails past the sensing unit, which through magnetic flux coupling to the sensing device adds in polarity to the magnetic flux in the core due to the primary winding, thereby increasing the signal induced into the secondary winding. This signal is detected by the receiver. When the train is within the given area between the selected transmitter and the receiver, the wheels and axle act as a shunt to short out any signals from the desired transmitter to the pickup unit.

47. 发明授权

US3450874A Railway track circuit 失效
标题翻译：铁路跟踪电路
公开(公告)号：US3450874A
公开(公告)日：1969-06-17
申请号：US3450874D
申请日：1967-03-31
申请人： GEN ELECTRIC
发明人： WHITTEN JAMES R
IPC分类号： B61L1/18 , B61L21/00 , B61L25/00
CPC分类号： B61L1/187

48. 发明授权

US3428868A Code detecting apparatus 失效
标题翻译：代码检测装置
公开(公告)号：US3428868A
公开(公告)日：1969-02-18
申请号：US3428868D
申请日：1966-02-15
申请人： WESTINGHOUSE BRAKE & SIGNAL
发明人： DUCKITT HARRY , KING KENNETH G
IPC分类号： B61L1/18 , B61L23/16 , H01H47/02
CPC分类号： B61L23/168 , B61L1/188

49. 发明授权

US3287554A Railway track circuit apparatus 失效
公开(公告)号：US3287554A
公开(公告)日：1966-11-22
申请号：US32086463
申请日：1963-11-01
申请人： WESTINGHOUSE AIR BRAKE CO
发明人： STAPLES CRAWFORD E
IPC分类号： B61L1/18 , H01H53/10
CPC分类号： H01H53/10 , B61L1/187

50. 发明授权

US3267280A Track circuit 失效
公开(公告)号：US3267280A
公开(公告)日：1966-08-16
申请号：US22198362
申请日：1962-09-07
申请人： GEN SIGNAL CORP
发明人： BUCK ROGER C
IPC分类号： B61L1/18 , B61L23/16 , H03K17/82
CPC分类号： B61L1/185 , B61L23/163 , H03K17/82

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