| 摘要 |
An actuating mechanism for initiating the operation of a speed control device which brakes a railroad vehicle should it exceed a predetermined speed. The actuating device consists of a flexible sensor hose containing a liquid subject to the weight of the railroad vehicle to operate and to close a pressure contact in an electrical circuit to energize a ground mounted or railside mounted tripping mechanism in the form of an electromagnet in the railroad classification yard which, in turn, trips the vehicle-mounted speed control device on a railroad car passing over the electromagnet for slowing down the speed of the railroad car. The electromagnet will not be energized to the "on" condition until sufficient time has elapsed as determined by a timer in the electrical circuit of the electromagnet and thereby only "standing" cars rather than "passing" cars turn on the electromagnet. A modified form of the device utilizes two such sensor hoses and pressure switches in a common circuit whereby both pressure switches must be closed in order to energize the electromagnet, the spacing distance between the sensor hoses being greater than the distance between the fore and aft railroad car trucks and the length of each of the hoses or sensing units being greater than the distance between the trucks.
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