Patent ID: 7510230

Claim:
A contractible canopy assembly for covering the open top of a quadrangular container which comprises: first and second rails parallelly formed along opposite sides of said open top; a plurality of train members slidingly mounted on each of said rails and being translatable therealong, including a leading pair of said train members movable toward a distant edge of said container; a plurality of booms spanning said top, each being secured at opposite ends to one of said train members; a pair of levers, each having a fulcrum point in a first location thereof and being rotatively attached at said fulcrum point to one of said leading pair of said train members about an horizontal axis; a leading one of said booms joining top first ends of said levers; a tarpaulin attached at spaced-apart intervals to said booms; means for pulling said leading pair of said train members back and forth along said rails; and means for rotating said levers and leading boom as said leading pair of said train members approach an extremity of said rails; wherein said means for rotating comprises a cam ramp proximal to said extremity; and a roller pin at a second location of at least one of said levers, said cam ramp being sized and contoured to interact with said roller pin and to rotate said at least one of said levers.