Folding hard panel tonneau cover with rail attachment

A foldable hard panel tonneau cover for a pickup truck cargo box, the cargo box having spaced apart upright side walls, an upright front wall and a tailgate forming an upright rear wall, the side, front and rear walls of the cargo box having upper ends, said tonneau cover comprising:

• two or more hard panels pivotally connected to one another to fold in an accordion-style fashion, each of said panels having side edges overlying the upper ends of said side walls;
• continuous gear hinges connecting said two or more panels to one another, each gear hinge having first and second hinge leaves, each leaf having a gear sector and each hinge further having a channel member holding said gear sectors of said first and second hinge leaves in mesh with one another;
• a pair of elongated rails, one rail of said pair disposed upon one of said side walls and the other rail of said pair disposed upon the other of said side walls, said rails extending substantially the length of each of the cargo box side walls between the front wall and the tailgate, said rails having a horizontal wall overlying the upper ends of the side walls and inner and outer upwardly projecting walls, said outer wall disposed furthest from the cargo box and the inner wall spaced inwardly from said outer wall and closer to the cargo box, said inner and outer walls forming a trough therebetween;
• clamp means for clamping said rails to said side walls;
• a seal member mounted to said rail horizontal wall within said trough and having a pair of upwardly projecting deflectable walls forming a receiving pocket therebetween;
• a frame member at each side edge of said panels having a lip substantially covering said trough of each rail;
• and
• a flange projecting downwardly from said lip for insertion into said receiving pocket by deflection of said seal member walls from one another whereby said flange is attached to said seal member to hold said panels on said cargo box side walls.