US Patent 7607714 Covering structure having automatic coupling system

A cargo box tonneau system includes a system frame and cover. The tonneau system also includes a bow member supported by the system frame. The bow member is coupled to the cover, and the bow member applies biased tension to the cover in a cross vehicle direction. The tonneau system further includes an elongated member coupled to the cover and a bow member supported by the system frame. The bow member includes a bow channel that receives the elongated member such that the cover is engaged with the bow member. The tonneau system also includes a rear frame rail assembly coupled to the cover and to the system frame at each end to facilitate tailgate movement.