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Diagnostic safety inspection apparatus

  • US 20040263178A1
  • Filed: 06/25/2003
  • Published: 12/30/2004
  • Est. Priority Date: 06/25/2003
  • Status: Abandoned Application
First Claim
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1. An improved diagnostic apparatus for diagnosing and servicing pneumatic braking systems of trailers comprising:

  • a pneumatic circuit, adapted for connection to pneumatic braking systems on the trailer;

    means, responsive to an electrical signal, for cycling the pneumatic circuit between an applied state wherein air is supplied to the trailer'"'"'s pneumatic braking systems and a released state wherein air is released from the trailer'"'"'s pneumatic braking systems;

    a timer circuit, electrically connected to the means for cycling the pneumatic circuit for controlling a timed interval between the applied state and the released state, the timed interval being adjustable;

    a diagnostic brake light circuit adapted for connection to a brake light circuit on the trailer, the diagnostic brake light circuit having a circuit switch operable to transmit an electrical signal in on-state and having an indicator means for connection thereto; and

    a pressure actuated switch, connected between the means for cycling the pneumatic circuit and the diagnostic brake light circuit, and operable between an electrically conductive state when pressure is applied to the pressure actuated switch and an electrically non-conductive state when pressure is released from the pressure actuated switch, wherein when the pneumatic circuit is in the applied state causing pressure to be applied to the pressure actuated switch and when the diagnostic brake light circuit is in the on-state, the electrical signal from the brake light switch is conducted through the pressure actuated switch to the means for cycling the pneumatic circuit, maintaining the pneumatic circuit in the applied state, regardless of the state of the timer circuit.

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