Abstract: A reverse caster suspension apparatus includes a tiltable platform assembly that is interposed between a sprung axle assembly and a vehicle structure. This arrangement provides an efficient means for changing the caster angle without harmful distortion of springs, and without requiring complex special-purpose suspension design and components that would likely be subjected to excessive wear. The platform assembly includes a platform frame to be connected to the vehicle, a nested, pivotally connected suspension frame to which the axle assembly is attached, and an actuator mechanism coupled at high mechanical advantage between the pivotally connected frames. A pivot axis of the platform assembly can be located approximately in line above respective spindle axes of the axle assembly for facilitating operation of the actuator at low power, and the actuator preferably holds its positive-caster condition with no applied power.

Abstract: A self-steering axle assembly which can be supported to a vehicle includes an axle. A suspension and steering system interposed between the axle and the vehicle are rotatable as a unit around a motion axis of the axle. A pivotally supported member such as a platform can tilt to rotate the suspension and steering system. A mover such as a piston and cylinder assembly is connected to determine the angular displacement of the platform with respect to the vehicle. When the actuator is in a first position, caster is positive and when the platform is in a second position, caster is negative enabling the vehicle to self steer in the reverse mode. In a further embodiment, a vehicle or trailer is provided including a self-steering axle constructed in accordance with the present invention.

Abstract: A reverse caster suspension apparatus includes a tiltable platform assembly that is interposed between a sprung axle assembly and a vehicle structure. This arrangement provides an efficient means for changing the caster angle without harmful distortion of springs, and without requiring complex special-purpose suspension design and components that would likely be subjected to excessive wear. The platform assembly includes a platform frame to be connected to the vehicle, a nested, pivotally connected suspension frame to which the axle assembly is attached, and an actuator mechanism coupled at high mechanical advantage between the pivotally connected frames. A pivot axis of the platform assembly can be located approximately in line above respective spindle axes of the axle assembly for facilitating operation of the actuator at low power, and the actuator preferably holds its positive-caster condition with no applied power.