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A tonneau cover is arranged to mount on the truck box of a conventional pick up truck for enclosing the box. The cover comprises a pair of panels which are pivotally mounted on respective sides of the box. The panels extend laterally inward such that free ends of the panels engage each other in a c

A tonneau cover is arranged to mount on the truck box of a conventional pick up truck for enclosing the box. The cover comprises a pair of panels which are pivotally mounted on respective sides of the box. The panels extend laterally inward such that free ends of the panels engage each other in a closed position. The panels may be pivoted upward and secured in an upward orientation by a pair of rails connected between the free ends of the respective panels in an extended position of the panels. The panels form a pair of side walls in the extended position for supporting large cargo in the box. The rails form a rack in the extended position for supporting additional cargo thereon. A locking device secures the panels in the closed position while a plurality of struts provides additional support to the panels when pivoting the panels between the closed and extended positions.

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The invention claimed is: 1. The tonneau cover for a pick up truck having a truck box with a bed, a front and wall and two vertical side walls standing upwardly from the bed, and a rear tail gate pivotal from a raised position extending across the side walls to a horizontal lowered position, the co

The invention claimed is: 1. The tonneau cover for a pick up truck having a truck box with a bed, a front and wall and two vertical side walls standing upwardly from the bed, and a rear tail gate pivotal from a raised position extending across the side walls to a horizontal lowered position, the cover for the truck box comprising; a pair of mounting rails each arranged to be mounted on a top surface of a respective side wall of the truck box; a pair of panels each pivotally mounted on a respective one of the mounting rails for pivotal movement between a closed position and a raised open position; each panel in the closed position extending inward from the corresponding mounting rail to a free end such that the free ends of the panels engage each other in the closed position of the panels; each panel in the raised open position extending generally upward from the corresponding mounting rail such that the free ends are spaced apart; two frame elements each mounted between the panels in the raised open position such that the panels are supported in an upright orientation for containing cargo in the truck box, the frame elements being mounted adjacent respective forward and rearward ends of the panels; wherein each mounting rail includes a horizontal portion lying on the top surface of the respective side wall, wherein each mounting rail has a row of fasteners adjacent an inner edge for engagement into a corresponding row of first holes in the side wall; wherein each mounting rail has a second row of fasteners, spaced outwardly of the first row, for engagement into a corresponding row of second holes in the side wall; wherein the fasteners of the first row are fastened from the inside the box; wherein the fasteners of the first row include bolts which have a head captured underneath a top surface of the mounting rail so as to be hidden; and wherein the fasteners of the second row are fastened from on top of the mounting rail. 2. The tonneau cover according to claim 1 wherein the fasteners of the second row include clips on the underside of the side wall which engage into openings in the side wall. 3. The tonneau cover according to claim 1 wherein the mounting rail includes on inner portion for depending along an inner surface of the respective side wall; each panel having an outer down-turned lip arranged adjacent the inner portion of the respective mounting rail; each mounting rail including a hinge arranged between the outer edge of a respective panel and the inner portion of the respective mounting rail, the hinge comprising two longitudinal connecting members each fastened along a respective one of the outer edge and the inner portion and a continuous flex coupling therebetween such that the hinge acts as a seal between the outer edge and the inner portion. 4. The tonneau cover according to claim 3 wherein the hinge extends continuously along the respective panel. 5. The tonneau cover according to claim 1 wherein each panel is molded from an inner layer and an outer layer each formed from a plastics material with the outer layer having a panel portion and a surrounding depending lip and with the inner layer being bonded inside the outer layer and wherein the inner layer is shaped to define a plurality of ribs which extend in a direction transverse to the truck box. 6. The tonneau cover according to claim 5 wherein the ribs are recessed to receive the frame element when stored in a retracted position extending longitudinally along the respective panel. 7. the tonneau cover according to claim 5 wherein there are provided three recesses in the ribs at positions spaced longitudinally of the panel, where a first recess is arranged to receive an end of the frame element attached to the panel, a second recess is arranged to receive an opposed end of the frame element and a third recess is arranged to receive and end of the frame element of the opposite panel. 8. The tonneau cover according to claim 5 wherein inner layer forms a shelf around the outer edge of the panel with a shelf lip of the inner layer at the outer lip of the outer layer to support the shelf for engaging onto a top surface of the truck box. 9. The tonneau cover according to claim 5 wherein each frame element includes a base plate for mounting the frame element on the respective panel wherein the base plate is trapped between the inner and outer layers. 10. The tonneau cover according to claim 5 wherein the layers are formed from ABS. 11. The tonneau cover according to claim 1 wherein one of the panels has a raised rib along the inner edge for engaging into a recess along the inner edge of the other panel; wherein one of the panels has a plurality of locking toggle members mounted thereon for pivotal movement to engage underneath a bottom edge of the other panel; and wherein the pivotal movement of the toggle members is effected by a longitudinal bar extending along the panel. 12. The tonneau cover according to claim 11 wherein the locking toggle members are mounted on one of the panels which includes a down-turned lip along its edge at the other panel and wherein the other panel includes a channel along its outer edge with the locking toggle members being arranged to engage underneath a bottom wall of the channel. 13. A tonneau cover for a pick up truck having a truck box with a bed, a front and wall and two vertical side walls standing upwardly from the bed, and a rear tail gate pivotal from a raised position extending across the side walls to a horizontal lowered position, the cover for the truck box comprising: a pair of mounting rails each arranged to be mounted on a top surface of a respective side wall of the truck box; a pair of panels each pivotally mounted on a respective one of the mounting rails for pivotal movement between a closed position and a raised open position; each panel in the closed position extending inward from the corresponding mounting rail to a free end such that the free ends of the panels engage each other in the closed position of the panels; each panel in the raised open position extending generally upward from the corresponding mounting rail such that the free ends are spaced apart; two frame elements each mounted between the panels in the raised open position such that the panels are supported in an upright orientation for containing cargo in the truck box, the frame elements being mounted adjacent respective forward and rearward ends of the panels; each mounting rail including a horizontal portion lying on the top surface of the respective side wall, wherein the mounting rail includes an inner portion for depending along an inner surface of the respective side wall; wherein each panel has an outer down-turned lip arranged adjacent the inner portion of the respective mounting rail; wherein each mounting rail includes a hinge arranged between the outer edge of a respective panel and the inner portion of the respective mounting rail, the hinge comprising two longitudinal connecting members each fastened along a respective one of the outer edge and the inner portion and a continuous flex coupling therebetween such that the hinge acts as a seal between the outer edge and the inner portion; and wherein each connecting member includes a top lip and a depending wall with the continuous flex coupling forming a flexible potion connected across the connecting members at the top lip. 14. The tonneau cover according to claim 13 wherein each connecting member has a guide flange portion extending therefrom toward the other connecting member. 15. A tonneau cover for a pick up truck having a truck box with a bed, a front and wall and two vertical side walls standing upwardly from the bed, and a rear tail gate pivotal from a raised position extending across the side walls to a horizontal lowered position, the cover for the truck box comprising; a pair of mounting rails each arranged to be mounted on atop surface of a respective side wall of the truck box; a pair of panels each pivotally mounted on a respective one of the mounting rails for pivotal movement between a closed position and a raised open position; each panel in the closed position extending inward from the corresponding mounting rail to a free end such that the free ends of the panels engage each other in the closed position of the panels; each panel in the raised open position extending generally upward from the corresponding mounting rail such that the free ends are spaced apart; two frame elements each mounted between the panels in the raised open position such that the panels are supported in an upright orientation for containing cargo in the truck box, the frame elements being mounted adjacent respective forward and rearward ends of the panels; each mounting rail including a horizontal portion lying on the top surface of the respective side wall, wherein each panel is molded from an inner layer and an outer layer each formed from a plastics material with the outer layer having a panel portion and a surrounding depending lip and with the inner layer being bonded inside the outer layer; wherein the inner layer is shaped to define a plurality of ribs which extend in a direction transverse to the truck box, wherein inner layer forms a shelf around the outer edge of the panel with a shelf lip of the inner layer at the outer lip of the outer layer to support the shelf for engaging onto a top surface of the truck box; and wherein the shelf at the front and rear ends of the panel is shaped such that a spacing of the shelf from the outer layer increases toward a center of the truck box such that the resting of the shelf on the edge of the truck box acts to hold the panels raised at the center of the truck box and lowered at the side walls of the truck box.