公开(公告)号：US3987989A

公开(公告)日：1976-10-26

申请号：US568565

申请日：1975-04-16

申请人： Willard L. Geiger

发明人： Willard L. Geiger

IPC分类号： B61L1/18 ,  B61L29/28 ,  B61L21/06

CPC分类号： B61L1/187 ,  B61L29/286

摘要： A railway signal system detects a train approaching the system tie points to a railroad track by transmitting in the track a modulated AC carrier wave signal, which is attenuated by the variable shunt effect of an approaching train, and monitoring the track signal in a receiver that responds to signal variations caused by such an approaching train to drop a signal relay, which operates a gate, flasher, or the like at a grade crossing. The track signal is normally automatically regulated to be within a voltage window, and a continuous system latch up feature precludes pick up of the signal relay upon occurrence of a broken rail or high track signal, for example, caused by a very high impedance ballast, until manually reset. A time delay circuit delays pick up of the signal relay after motion has been first detected, and a bypass circuit for a low track signal detector allows system operation even after an unexpected shunt occurs on a monitored section of track. Moreover, an automatic gain control in the receiver reduces ring-by time to a minimum when a train leaves the system tie points, which define a monitored track island.

公开(公告)号：US4026505A

公开(公告)日：1977-05-31

申请号：US649502

申请日：1976-01-15

申请人： Willard L. Geiger ,  John D. Williams

发明人： Willard L. Geiger ,  John D. Williams

IPC分类号： B61L1/18 ,  B61L21/06

CPC分类号： H03H7/48 ,  B61L1/187

摘要： A high pass coupler or filter network provides a bypass for relatively high frequency AC signals, while providing DC signal isolation and avoiding loading the track for relatively low frequency AC signals, around a set of insulated joints in a railroad track or the like. The high pass coupler includes a coupling portion for connection to a track and a dynamically resonant filtering portion with a selectable low cut off frequency determined by the proper size capacitor. The capacitor sets up resonance with the track inductance, which decreases in magnitude in response to the moving shunt affect of a train approaching the coupling portion and thus increases the resonant frequency of the coupler, and the capacitor is of a magnitude that ensures the coupler resonant frequency will not exceed the frequency of the AC signals normally to be passed by the coupler. Moreover, in the high pass coupler, losses may be introduced, for example, by a potentiometer to present to the coupled AC signals and particularly to the system employing the same an impedance characteristic at least approximately equivalent to the normal track impedance characteristic presented thereto if the track were electrically continuous.

摘要翻译： 高通耦合器或滤波器网络为相对高频的AC信号提供旁路，同时提供DC信号隔离，并避免在铁路轨道等中的一组绝缘接头周围加载相对低频AC信号的轨道。 高通耦合器包括用于连接到轨道的耦合部分和具有由适当大小的电容器确定的可选择的低截止频率的动态谐振滤波部分。 电容器与轨道电感器建立共振，其响应于接近耦合部分的列车的移动分流影响而减小幅度，从而增加耦合器的谐振频率，并且电容器具有确保耦合器谐振的幅度 频率不会超过通常由耦合器通过的交流信号的频率。 此外，在高通耦合器中，例如可以通过电位器引入损耗，以向耦合的AC信号提供损耗，特别是引入与至少近似等于给出的正常轨道阻抗特性相同的阻抗特性的系统，如果 轨道电气连续。

公开(公告)号：US4365777A

公开(公告)日：1982-12-28

申请号：US67321

申请日：1979-08-17

申请人： Willard L. Geiger

发明人： Willard L. Geiger

IPC分类号： B61L1/18 ,  B61L1/20 ,  B61L23/04 ,  B61L29/22 ,  B61L1/02 ,  B61L1/12 ,  B61L21/06

CPC分类号： B61L23/044 ,  B61L1/187 ,  B61L1/20 ,  B61L23/048 ,  B61L29/226

摘要： 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 transmitter and one receiver each connected to the tracks so that transmitted and received track signals, which are partially pulse modulated for optimum filtering and signal coupling and minimum third harmonic radiation, appear on opposite sides of the crossing. The section of track between the transmitter and receiver is designated as a crossing island and sections of rail outside of the island are known as approaches. In addition to its basic train movement detection function, the detector contains additional features that are designed to provide operation under a variety of application conditions, including automatic ballast compensation, loss of shunt, low signal/low gain condition, high signal/broken rail condition, delayed pick-up, delayed drop-out and reverse switch override, and bi-directional motion detection.

摘要翻译： 火车接近检测器使用音频频谱中的频率，在铁路列车出现之前和期间在等级交叉点处激活等级穿越保护装置。 检测器是完全固态的，并且包括一个发射器和一个接收器，每个接收器连接到轨道，使得发射和接收的轨道信号被部分脉冲调制以用于最佳滤波和信号耦合以及最小三次谐波辐射出现在 穿越。 发射机和接收机之间的轨道部分被指定为交叉岛，岛外的轨道部分称为方法。 除了其基本的列车运动检测功能之外，检测器还包含额外的功能，旨在提供各种应用条件下的操作，包括自动镇流器补偿，分流损耗，低信号/低增益条件，高信号/断路条件 延迟拾取，延迟退出和反向开关倍率以及双向运动检测。

公开(公告)号：US3974991A

公开(公告)日：1976-08-17

申请号：US608085

申请日：1975-08-27

申请人： Willard L. Geiger

发明人： Willard L. Geiger

IPC分类号： B61L23/16 ,  B61L29/28 ,  B61L21/06

CPC分类号： B61L23/168 ,  B61L29/286

摘要： 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 device also operable at such first frequency but located at a subsequent grade crossing or location, which is relatively proximate the first, is capable of looking through the first crossing even under unfavorable ballast conditions thereat to detect an approaching train with respect to its speed and distance from the second crossing. The output of the repeater receiver and that of a further transmitter-receiver movement detector system operable at a different frequency from the first are combined in a logic circuit to provide safe, minimum signal down time at the subsequent location.

摘要翻译： 可以以第一频率工作的第一发射机 - 接收机移动检测器系统响应于列车接近速度和距离检测接近第一级交叉或其他轨道位置的列车，以及也可在这样的第一频率处操作的中继器接收机移动检测器装置 即使在不利的镇流器条件下，随后的等级道口或位置也相对接近第一，能够通过第一道口观察相对于其距离第二道口的速度和距离的接近列车。 中继器接收机的输出和可操作在与第一个频率不同的频率的另外的发射机 - 接收机移动检测器系统的输出在逻辑电路中组合以在随后的位置提供安全的最小信号停机时间。