| 摘要 |
Parallel, substantially horizontal, upper first tracks ( 34 ) extend lengthwise of a vehicle load bed ( 14 ). Parallel, substantially horizontal, second tracks that are below the first tracks ( 34 ) also extend lengthwise of the load bed ( 14 ). Forward guides ( 44 ) carried by cover sections ( 22, 24, 26, 28, 30, 32 ) travel in the tracks ( 34 ) and rear guides ( 46 ) travel in the tracks ( 36 ). A rear cover section ( 18 ) is driven forwardly and rearwardly by a drive mechanism ( 54, 72, 74, 76 ). Forward movement of the cover section ( 18 ) moves the other movable cover sections ( 22, 24, 26, 28, 30, 32 ) into a nested position within the forward cover section ( 20 ). Movement of the rear cover section ( 18 ) in the opposite direction pulls the cover sections ( 22, 24, 26, 28, 30, 32 ) out from the nested position and spread them out over the length of the load bed ( 14 ).
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