Land vehicles – Wheeled – Running gear
Patent
1995-03-20
1996-07-16
Dickson, Paul N.
Land vehicles
Wheeled
Running gear
280702, B60G 1126
Patent
active
055360360
ABSTRACT:
An air suspension system on a van-type trailer includes a mechanism for mechanically locking the system when the van is parked. The air suspension includes a wheel axle which is supported at an end of a cantilevered arm with the opposite end of the arm rotatable about a pivot on the vehicle frame. An air bag is positioned between the arm and the frame for permitting relative up-and-down movement during transportation of the van. The locking mechanism is a fixed strut which is engaged between the frame and the axle to lock the frame and the axle against relative up-and-down movement by fixing the distance between the frame and the axle. In a first embodiment, the strut is rotatable to move the strut into a retracted position to enable relative up-and-down movement during transportation of the van. In a second embodiment, the strut is a double-acting hydraulic cylinder which replaces the shock absorber normally found on a trailer. A valve is connected to the cylinder and is movable from a first position which allows the cylinder to move upwardly and downwardly thereby allowing relative up-and-down movement between the frame and the axle, to a second position when the vehicle is parked which prevents the cylinder from moving upwardly and downwardly thereby preventing the frame and the axle from moving in a relative up-and-down movement.
REFERENCES:
patent: Re32736 (1988-08-01), Lovell
patent: 3883153 (1975-05-01), Singh et al.
patent: 4145073 (1979-03-01), McLuckie et al.
patent: 4279319 (1981-07-01), Joyce
patent: 5018755 (1991-05-01), McNeilus et al.
patent: 5058917 (1991-10-01), Richardson
patent: 5192101 (1993-03-01), Richardson
Dickson Paul N.
Wabash National Corporation
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