| 摘要 |
The invention relates to a device for the remote supervision of point mechanisms operated by means of four lines e.g. by a three-phase current or by an alarm circuit which is operated by four lines and comprises contacts whic h are switched according to the position of the points and, once the respectiv e end position has been reached, switch off an alarm circuit guided over the four lines for a points monitoring device that is e.g. fed by a constant voltage. A plurality of checking planes is provided in the longitudinal direction of the rails, and at least four switching contacts are interconnected in each checking plane and co-operate with mobile parts of th e point mechanism or the point, e.g. a checking rod, in such a way that respectively two switching contacts are in a closed switching position and t wo switching contacts in an open switching position in an end position, and the switching position of each switching contact is changed once when it is move d into the other end position. According to the invention, the switching contacts of a plurality of checking planes are interconnected in such a way that, in the respective end positions, all closed switching contacts of the interconnected checking planes are mounted in series to form respectively on e alarm circuit.
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