Abstract: A tow truck of the wheel-lift type is provided. In a first embodiment, a telescopic boom is supported by parallelogram linkage which is actuated by a hydraulic motor which is slightly inclined to the horizontal, the inner end of the boom, in its travel position being above and somewhat forwardly of the ring gear housing of the rear axle of the tow truck. The parallelogram linkage supports the boom through a boom support structure which permits it to be swung in a substantially horizontal plane, about substantially vertical pinions. The grid, which engages the wheels, includes a movable member which engages a wheel and raises it relative to the boom and grid, without movement of the boom. In a second embodiment, a substantially vertical post supports a parallelogram linkage which in turn supports a substantially horizontal extensible boom having a wheel grid at its outer end.

Abstract: A suspension and steerage system is disclosed for a wheel supported vehicle. A suspension arm assembly of parallelogram configuration is pivotally attached to one side of the main frame and freely supports a wheel spindle. The piston rod of a hydraulic motor interconnects opposite wheels, and a lever structure is provided which, in response to pivotal oscillation of one wheel, axially activates the piston rod to transfer reactive forces to the opposite side of the main frame, and serves to level the plane of the main frame. The hydraulic motor can further be equallized to lock out further movement of the wheels, thereby stabilizing the vehicle in a static condition.

Abstract: A tracked vehicle has four pneumatic tires each driven by a hydraulic motor drivingly connected to a torque hub. A drive motor, torque hub and wheel are supported by a motor mount assembly which includes a pair of transverse channels, connected at their outer ends to a hub mount plate and at their inner ends to a slide plate. The slide plate is in planar engagement with a chassis plate, and is releasably held to the chassis plate by a pair of linearly extending rail guides bolted to the chassis plate and providing with the chassis plate a guideway in which the slide plate is movable. A hydraulic motor engages a channel of the motor mount, and has its piston rod pivotally attached to an abutment anchored to the chassis plate.