Abstract: A control unit for interfacing a single motor-driven air compressor with both an automatic vehicle leveling control system and a headlamp washer control system. The washer and leveling system commands are serviced according to a predetermined priority schedule so that interaction between the two systems is avoided.

Abstract: A hydraulic and pneumatic suspension system for motor vehicle is disclosed, the improvement consisting in that each stay tube of the system is connected to a liquid-level-adjuster of its own and is also connected to a load-shift adjuster: the latter device is capable of controlling, according to a preselected value, the ratio of distribution of the load between the wheels of the front axles and those of the rear axle. These interconnections are such as to provide an improved control of the rolling and the pitching movements of the vehicle body while concurrently providing a better shock dampening in the case in which one wheel only is engaged by an isolated obstacle.

Abstract: The invention provides a support unit for drivers' cabs which actively compensates for any relative movement between chassis and cab by providing at least one support cylinder which is axially rigidly mounted on the chassis with its support piston and flexibly supported on the cab by its cylinder, the cylinder forming a movement-producing unit with a directional control valve whose body alternately connects the front side of the support piston to the pressure side of a constant-pressure circuit or to a non-pressurized outlet and is attached to the cab.

Abstract: A system or structure for supporting a construction rig, such as a crane or the like, is formed with four bearing members each of which is maintained in contact with a ground formation over which the rig is to be moved by deflective action of the support structure. In the operation of the device, when a first bearing member is deflected relative to a reference plane, a second bearing member located diagonally opposite the first bearing member is deflected relative to the reference plane in the same direction by approximately the same distance. At the same time, a third and fourth support bearing member of the support system are each deflected relative to the reference plane in a direction opposite to the direction in which the first and second support bearing members are moved by approximately the same distance as the first two support bearing members.

Abstract: A combination load-leveling and kneeling air suspension system for a vehicle having a sprung member and an unsprung member. The system has a pair of laterally spaced air springs, a pressurized air reservoir with a first tubing line connecting the pressurized air reservoir to the first laterally spaced air spring and a second tubing line connecting the pressurized air reservoir to the second laterally spaced air spring. The first tubing line and the second tubing line have a common tubing portion. A first valve member is located in the first tubing line but not in the common tubing portion. Likewise, a second valve member is located in the second tubing line but not in the common tubing line portion. A third tubing line is connected between the pair of laterally spaced air springs and an isolation valve is located in the third tubing line intermediate its ends. A fourth tubing line connects the isolation valve with the common tubing line portion.

Abstract: A digital or analogue regulator circuit for activating a pump or pressure reducing valve, whose action respectively raises and lowers the body of a vehicle relative to the rear axle, each operating with a time delay so that temporary level changes will not initiate a regulatory process. Feedback circuits provide hysteresis. In both embodiments, level changes are represented by changes in the collector potential of a transistor and positive and negative feedback are provided to the base of the transistor to create the hysteresis or dead zone. In the digital embodiment, a counter generates the delay and the negative feedback.

Abstract: A control circuit for an air-spring shock absorber controls pressurization or depressurization of the air chamber of the shock absorber in response to the output signal condition of a level sensor. The control circuit includes a first signal path that conditions the operation of an air pump for pressurizing the air chamber, and a second signal path that conditions the operation of an exhaust valve for depressurizing the air chamber. A timing circuit delays the enablement of the air pump and exhaust valve until the level sensor output signal condition associated with the actuation of the pump or valve has existed for a minimum predetermined time period. The timing circuit includes an R-C time delay circuit with an instant reset to avoid cumulative signal build-up. The control circuit is comprised of a set of digital logic gates which are preferably implemented by standard integrated circuit chips.

Abstract: Multiaxle vehicles are provided having a superstructure that tilts less than the wheel axle support therefor, comprising a chassis; at least first and second wheel axles supporting the chassis, at least one of which is pivotably mounted on the chassis so as to be tiltable sideways about the pivot mounting in a plane substantially parallel to the sideways tilting plane of the vehicle; a superstructure pivotably mounted on the chassis above the pivot mounting for the tiltable axle, for tilting about the pivot mounting in a plane parallel to the axle tilting plane; and means on one side of the pivot mounting for the tiltable axle, linking the superstructure of the tiltable axle, and pivotably attached to the superstructure on one side of the chassis and to the tiltable axle on the other side of the chassis, the spacing between the pivot mounting of the axle and the pivot attachment of the linking means thereto being less than the spacing between the pivot mounting of the superstructure and the pivot attachment o

Abstract: In an automobile having an independent motor driving each wheel, the effective unsprung mass is minimized, and impulse shock is reduced, by arranging each wheel at the end of an arm pivoted about a normally horizontal axisof gravity of the motor, having a center of percussion approximately at the wheel axis, and having a corresponding axis of suspension at the arm's pivot.

Abstract: The present disclosure relates to suspension means for supporting the cab of a truck on a truck chassis frame. It is disclosed in the environment of a tilt cab type truck. The suspension includes a pair of front and a pair of rear suspension arms that interconnect the cab and the frame. Front air springs are interposed between the front arms and the frame. The rear arms are connected to the frame by releaseable latch mechanisms and rear air springs are interposed between the latch mechanisms and the cab. An anti-roll stabilizer bar extends transversely between the front arms and functions to prevent tilting of the cab about a longitudinal roll axis.