Patent ID: 6848734
Filing Date: 2005-02-01
Classification: B60J

Abstract:
1. In a roll type closing truck box cover device for mounting across the top of a truck box having a front wall and opposing side walls, said cover device comprising a flexible cover with front and rear edges and side edges, said cover having side rollers mounted along its opposing side edges for traveling along the side walls of the truck box, a pair of spiral ridges on each side of the flexible cover adjacent the forward wall of the truck box and portions of the side walls of the truck box, said pair of spiral ridges each having upper and lower edges with spiraling connecting ridge portions there between, said cover being adapted to be rolled forward into the spiral ridges, for opening the truck box, gradually into a spiral shape by sliding downward along the spiral ridges; sealing mechanism comprising a lateral overhanging flange for mounting over the top of the front wall of the box, a lateral plate mounted to the front edge of said cover with sealing rollers mounted to the lateral outer edges of said plate, a pair of cams mounted to the upper edges of the spiral ridges in the path of said sealing rollers, said sealing rollers mounted to opposite lateral edges of said front lateral plate of the cover in the path of said spiral ridges and in the path of said cams, with said side rollers of said cover being mounted in the path of said spiral ridges and beside the path of said sealing rollers and cams; whereby said cover may be rolled open into a spiral shape at the front end of the box by the side edges of the cover following the path of the spiral ridges and said cover may be unrolled gradually out of said spiral ridges and straightened over the top and along the sides of the box to close the cover, said sealing rollers being spaced laterally outward in the path of said cams, whereby the sealing rollers on said front plate of said cover in the path of said cams engage said cams on said spiral ridges to cam said front plate and said front end of said cover sharply upward flush against said overhanging flange at the front wall of said box to seal said front end of said cover to the overhanging flange at the front of said truck box in at least substantially watertight relation to one another.