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Device for monitoring the flow in the air line of an air brake system on a railway vehicle

  • US 3,957,314 A
  • Filed: 11/25/1974
  • Issued: 05/18/1976
  • Est. Priority Date: 11/24/1973
  • Status: Expired due to Term
First Claim
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1. In a device for monitoring the flow in an air line of an air brake system on a railway vehicle, th combination of an air line connected to a source of compressed air and an operator'"'"'s brake valve therein to control pressure in said air line and movable between brake release and brake applied positions, a restrictor in said air line, pressure sensing means responsive to a pressure drop in said restrictor, a first control line including a first switching means responsive to said pressure sensing means and connected to a source of energy for passing energy therethrough only when a predetermined pressure difference across said restrictor is exceeded, second switching means connected to said first switching means and having a first normally closed position and a second normally open position, means connected to said first position of said second switching means for indicating a brake release, means responsive to an increase in pressure at said operator'"'"'s brake valve for connecting said second switching means through said first switching means to said source of energy whereby said brake release indicating means is energized only when said operator'"'"'s brake valve is in the brake release position, and means connected to said normally closed first position of said second switching means for indicating a defect-originated flow of air in the air line when a predetermined pressure drop occurs across said restrictor.

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