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    Metal impurity detector for tubular conveyor system
    1.
    发明授权
    Metal impurity detector for tubular conveyor system 失效
    用于管道输送系统的金属检测器

    公开(公告)号：US3665298A

    公开(公告)日：1972-05-23

    申请号：US3665298D

    申请日：1970-01-05

    申请人： ERICO PROD INC

    发明人： GEIGER WILLARD L

    IPC分类号： G01N27/72 ,  G01R33/00

    CPC分类号： G01N27/72

    摘要： Apparatus for locating and removing foreign metal objects in the supply system of a plastic molding machine and the like wherein particulate plastic material is transported from a supply source at high velocity by way of a tubing system, consisting of a detector unit for monitoring the flow of the material through the tubing and a remote unit for momentarily diverting the flow when the presence of metal is detected. The diverter unit is a solenoid actuated flapper valve in the tubing system and the detector unit consists of a dual transmitter and receiver coil arrangement surrounding a part of the tubing, energized from a radio frequency energy source and arranged to develop an output signal when a transported metal object affects the normal balanced condition. Solid state components are employed throughout radio frequency oscillator, amplifier, differential detector and relay driver circuits and a balance coil and tuning slug are employed for critical adjustment of the signal balance and sensitivity in the sensing area.

    Railway signal system
    9.
    发明授权
    Railway signal system 失效
    铁路信号系统

    公开(公告)号：US3706098A

    公开(公告)日：1972-12-12

    申请号：US3706098D

    申请日：1970-10-23

    申请人： ERICO PROD INC

    发明人： GEIGER WILLARD L

    IPC分类号： B61L29/28 ,  B61L21/06

    CPC分类号： B61L29/286

    摘要： A railway crossing signaling system in which an audio frequency signal coupled into the tracks is affected by the presence of a train near the crossing location and utilized to control operation of a conventional crossing signal relay. A relatively high impedance amplifier is transformer coupled to a section of the tracks, the latter acting as a part of a low impedance feedback path to cause oscillations at a fixed frequency determined by a high Q resonant reed filter. In preferred embodiments of the invention, oscillation is sustained via either direct connection of the feedback loop or connection through the tracks and interrupted by the shunting effect of the train, however, one embodiment of the invention relies on the presence of a train to complete the feedback circuit to produce oscillation. In all embodiments of the invention a relatively low frequency high power signal is impressed upon the track circuit through the common amplifier both to enhance oscillation and to cause frittering or establishment of the track circuit in spite of surface contamination and the like.

    摘要翻译： 铁路交叉信号系统，其中耦合到轨道中的音频信号受到在交叉位置附近的火车的存在的影响，并用于控制常规交叉信号继电器的操作。 相对较高的阻抗放大器被变换器耦合到轨道的一部分，后者用作低阻抗反馈路径的一部分，以在由高Q谐振簧片滤波器确定的固定频率下引起振荡。 在本发明的优选实施例中，通过反馈回路的直接连接或通过轨道的连接并通过列车的分流效应中断振荡，然而，本发明的一个实施例依赖于列车的存在来完成 反馈电路产生振荡。 在本发明的所有实施例中，相对低频的高功率信号通过公共放大器施加在轨道电路上，以增强振荡，并且尽管表面污染等导致轨道电路的磨边或建立。