| 摘要 |
The invention includes a sealing mechanism device for sealing the front overhang for the cover of a roll type cover device for the truck box of a pick up truck when closing the cover over the truck box. The mechanism device has a cam structure on spiral ridges for caming the cover when closing the cover. The cams on the spiral ridges cooperate with rollers on the front edge of the cover to cam the front edge of the cover sharply up) against an overhang at the front of the truck box mechanism device to close the front edge of the cover flush to the overhang of the mechanism in substantially watertight relation to one another.
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