| 摘要 |
A reliable retractable and extendable protective cover assembly for covering the bed of a pick-up truck includes a pair of elongated guide tracks and rollers on each of the sides of the bed. The guide tracks are positioned in parallel formation on either side of the bed, and the rollers are located within the tracks. Furthermore, the guide tracks are located within the area on the bed that is to be covered. This positioning of the guide tracks and rollers reduces the risk of damage to the track-roller assembly in case of a hazard in the surrounding environment. A plurality of frame members are in guided engagement with the rollers. Expansion brackets are secured at the top and bottom of each of the frame members. Preferably the top bracket is fixedly secured to the frame member, whereas the bottom bracket moves along the length of the frame member. The frame members communicate with each other through linkages, the linkages being attached to the expansion brackets on two sides thereof. This balanced force applied to the lower bracket prevents jamming in the assembly during extension or retraction of the reliable protective cover assembly. Upon initiating an automatic or a manual process for activating the reliable protective cover assembly, the roller motion along the tracks causes the lower bracket of each frame member to move along the length of the frame member producing a relative displacement, that is devoid of jamming, as the frame members move towards or away from each other.
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