US Patent 7370904 Covering device for a vehicle container

A cover assembly for a vehicle carried open top container wherein a cover is connected at one end to a vertically adjustable tower and an opposite end to a cross member connected to a pair of pivot arms that are mounted at their lower ends to be pivoted by at least one hydraulic actuator that is mounted to the vehicle intermediate opposite ends of the container and adjacent the bottom thereof. An effective length of each pivot arm may be adjusted and locked in adjusted position.