Patent ID: 7441781

Claim:
A lift system for use with a vehicle's air suspension system having an air supply, a set of air bags, a battery, air hose lines for interconnecting the lift system with the air suspension system and an air ride leveler control valve for raising the rear end of the vehicle for connecting the rear end with a trailer and letting up the trailer's landing gear, the lift system, comprising: a control switch electrically interconnected to the battery and having an on position for engaging the air suspension system and raising the vehicle's rear end, and an off position; an air hose line interconnected to the control switch and the air supply; a first air control valve and a second air control valve, the first air control valve electrically interconnected to the control switch such that when the control switch is disposed to the on position, air flows from the vehicle's air supply through the first and second air control valves and to the air bags for inflating the air bags and raising the rear end of the vehicle; a second air control valve electrically interconnected to the control switch such that when the control switch is disposed to the off position, the second air control valve is closed and air can only flow through the first air control valve to the vehicle's air ride leveler control valve; an air regulator having an air gauge with the air regulator interposed between the second air control valve and the air bags for regulating the volumetric flow of air to the air bags; and a one-way valve serially connected between the air regulator and the air bags for allowing air to flow to the air bags when the control switch is disposed to the on position and preventing the flow of air to the air bags when the control switch is disposed to the off position.