Diagnostic safety inspection apparatus
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
An improved diagnostic device for inspecting the pneumatic braking systems and electrical signaling systems on a cargo hauling trailer comprises a unique circuit arrangement permitting a single inspector to inspect the pneumatic braking systems and when required, override diagnostic cycling of the brakes between applied and released states to an alternate diagnostic wherein the system is continuously supplied with air to permit leak detection. A solenoid, normally cycling air to the pneumatic braking systems under the control of a programmable timer, can be overridden and powered to supply continuous air, regardless of the state of the timer, by actuating a brake light circuit which is connected to the solenoid through a pressure actuated switch.
18 Citations
18 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An improved diagnostic apparatus for testing electrical and pneumatic systems on a trailer 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;
a plurality of diagnostic signaling circuits each circuit adapted for connection to signaling circuits on the trailer, each diagnostic signaling circuit having a circuit switch means, operable between an off-state and an 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
Specification