Elevation adjustment system for a trailer truck in which fluid pressure in the expandable fluid chamber is lowered so that the arrangement is lowered and is re-elevated to disengage the trailer from the tow vehicle

摘要

After the support leg (122) of the trailer (120) is engaged on the surface (150), a fluid-operated level control mechanism lowers the coupling arrangement (111) until it reaches a reference elevation that is determined by the length of the support leg. After reaching the reference elevation, fluid pressure in the expandable fluid chamber (112) of the level control mechanism is lowered until the arrangement is lowered below the reference elevation. The arrangement is re-elevated to a level equal to the reference elevation to disengage the trailer from the tow vehicle (110). Independent claims are also included for (1) motor vehicle; (2) method of adjusting the elevation of the motor vehicle's coupling arrangement; (3) computer program product loadable into the internal memory of a computer.