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Derail signal switch

  • US 4,133,506 A
  • Filed: 11/01/1977
  • Issued: 01/09/1979
  • Est. Priority Date: 11/01/1977
  • Status: Expired due to Term
First Claim
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1. In a system for sensing derailment of a remotely controlled train comprising a sensing means for sensing the derailment of said train and a circuit means integrated with said train for stopping the derailed train when sensed by said sensing means, wherein said sensing means comprises:

  • (a) a series of elongated deformable members;

    (b) a rod member contained within each said elongated deformable member and electrically insulated therefrom;

    (c) means for connecting said rod member and said deformable member to said circuit means for shutting down said train;

    (d) said circuit means being activated upon said deformable member being pressed into contact with said rod member by said derailed train;

    (e) said deformable members being of sufficient rigidity to withstand the pressure from a rubber tired vehicle such as a track cleaner, car or truck rolling thereover without being pressed into contact with said rod member;

    (f) said elongated deformable members having sealing means at each end thereof for sealing the internal portions of said deformable members from moisture and other materials external thereto;

    (g) said rod members being spaced from said deformable members by at least one electrical insulator supporting said rod members from said deformable members;

    (h) said elongated deformable members being secured on cross ties between said rails.

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