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Warning circuit for a tractor/trailer combination

  • US 4,065,751 A
  • Filed: 10/18/1976
  • Issued: 12/27/1977
  • Est. Priority Date: 10/18/1976
  • Status: Expired due to Term
First Claim
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1. In a tractor/trailer electrical circuit having an electrical power supply carried by the tractor and signal lamps carried by the traler, a warning circuit for indicating in the tractor an event occurring in the trailer comprisinga conductive path for supplying electrical power from the power supply to energize the signal lamps,means for sensing an event occurring in the trailer and providing a corresponding event signal,means responsive to the event signal and connected to the said conductive path for repetitively opening and closing the conductive path at a low rate allowing the signal lamps to substantially cool when the path is opened and the lamps are de-energized, whereby each time the lamps are energized a large current pulse is produced in the conductive path, andmeans in the tractor for indicating the said event occurring in the trailer including an indicating lamp, a circuit for detecting the said large current pulses in the conductive path and means responsive to the said large pulses for energizing the indicating lamp.

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