Patent attributes
A vehicle cargo box tonneau cover device includes two or more hard panels formed of thin-walled, friction welded polypropylene material hermetically enclosing extruded support beams. Each panel forms an upper surface falling on a common plane when in a deployed position. Adjacent panels are joined along their common edges by a multi-pin hinge disposed entirely below the upper surface to provide a flat overall appearance. The hinge has a first flange carried by a first panel, a second flange carried by an adjacent second panel, and an elongated free-moving link mounted to the first flange for relative rotation about a first axis and mounted to the second flange for relative rotation about a second axis. The two axes are spaced from and parallel to one another, whereby the hinge enables 180° freedom of rotation between the adjacent panels when transitioning between a planer deployed position and a folded retracted position.
