公开(公告)号：USD365977S

公开(公告)日：1996-01-09

申请号：US21718

申请日：1994-04-22

申请人： Barry L. Smith

设计人： Barry L. Smith

公开(公告)号：US4878638A

公开(公告)日：1989-11-07

申请号：US2369

申请日：1987-01-12

申请人： James R. Hoelscher ,  Klaus H. Frielinghaus ,  Frank A. Raso ,  Barry L. Smith

发明人： James R. Hoelscher ,  Klaus H. Frielinghaus ,  Frank A. Raso ,  Barry L. Smith

IPC分类号： B61L1/18 ,  B61L23/16

CPC分类号： B61L23/166 ,  B61L1/187

摘要： 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 parallel branches tuned to each frequency. The track circuit using the tuned loop transmitter eliminates DC return current imbalance effects while maintaining suitably high track circuit shunting sensitivity.

摘要翻译： 音频（AF）轨道电路，其中以双谐振模式操作的用于处理两个信号频率的铁路轨道调谐环路发射机可以耦合到轨道。 每个频率通过调谐单元传导，该调谐单元具有调谐到每个频率的串联和并联分支。 使用调谐环路发射机的轨道电路消除了直流回波电流不平衡效应，同时保持适当的高跟踪电路分流灵敏度。

公开(公告)号：US4498650A

公开(公告)日：1985-02-12

申请号：US356861

申请日：1982-03-10

申请人： Barry L. Smith ,  James R. Hoelscher ,  William A. Petit

发明人： Barry L. Smith ,  James R. Hoelscher ,  William A. Petit

IPC分类号： B61L1/18 ,  B61L25/00 ,  B61L21/00

CPC分类号： B61L1/188

摘要： A railroad train detector and communication system relies on the track rails for communicating information among a plurality of locations. The equipment located at each of the locations eliminates relay based current detection, relay based current transmission, and relay based logic functions, and rather these functions are implemented with microprocessors. An extent of signal trackway is defined between a pair of head ends, intermediate the head ends at intermediate insulated joint locations, a microprocessor implemented transmitter/receiver pair is provided. One half of the transmitter/receiver pair manages communication flow for each direction of information flow at the joint. At each of the head locations, only a single transmitter/receiver is required. Associated with each microprocessor in a transmitter/receiver is auxiliary apparatus to couple the microprocessor's input/output ports to the track rails themselves. This auxiliary apparatus includes non-relay based track signal detector (or receiver) for sensing current flow in the track rails, a track current generator for transmitting information through the track rails and optionally a non-relay based approach detector to sense changes in track current flow. Based on signals detected in the track rail, the microprocessor of a receiver for example can determine the occupancy condition of a portion of the railroad track rails between the receiver and associated transmitter. Based on the signals, therefore, the microprocessor outputs an indication identifying the occupancy/non-occupancy condition of this portion of the track rails.

摘要翻译： 铁路列车检测器和通信系统依靠轨道轨道来在多个位置之间传送信息。 位于每个位置的设备消除了基于继电器的电流检测，基于继电器的电流传输和基于继电器的逻辑功能，而这些功能由微处理器实现。 在一对头端之间限定了信号轨迹的程度，在中间绝缘接合位置处的头端之间，提供了微处理器实现的发射器/接收器对。 发射机/接收机对的一半管理在联合处的信息流的每个方向的通信流。 在每个头部位置，只需要一个发射器/接收器。 与发送器/接收器中的每个微处理器相关联的是将微处理器的输入/输出端口耦合到轨道轨道本身的辅助设备。 该辅助设备包括用于感测轨道中的电流的非继电器轨道信号检测器（或接收器），用于通过轨道轨道传输信息的磁道电流发生器，以及可选地基于非继电器的接近检测器来检测轨道电流的变化 流。 基于在轨道轨道中检测到的信号，接收机的微处理器例如可以确定接收机和相关发射机之间的一部分铁路轨道的占用情况。 因此，基于信号，微处理器输出标识轨道轨道部分的占用/非占用状况的指示。