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A cover system for a trailer of a freight transport vehicle having a cargo space, the cover system having a pair of track brackets, tracks, generally U-shaped bow portions mounted to the trucks so that there is displacement of the bow portions as each member of the pair of trucks is displaced along

A cover system for a trailer of a freight transport vehicle having a cargo space, the cover system having a pair of track brackets, tracks, generally U-shaped bow portions mounted to the trucks so that there is displacement of the bow portions as each member of the pair of trucks is displaced along the length of the members of the track and a flexible canopy supported by the bow members for covering or uncovering the cargo space.

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We claim: 1. A cover system for a trailer of a freight transport vehicle having a cargo space, the cover system comprising: (a) at least one pair of track brackets adapted for mounting on opposite sides of the trailer; (b) at least one pair of tracks adapted for mounting to the track brackets, each

We claim: 1. A cover system for a trailer of a freight transport vehicle having a cargo space, the cover system comprising: (a) at least one pair of track brackets adapted for mounting on opposite sides of the trailer; (b) at least one pair of tracks adapted for mounting to the track brackets, each member of the pair of tracks extending horizontally along the sides of the trailer, each member of the tracks having a first channel, a second channel and an underhang; (c) at least one pair of trucks adapted for mounting in the tracks and further adapted for displacement along the opposite sides of the trailer along the length of the members of the pair of tracks; (d) a plurality of generally U-shaped bow portions, each of the bow portion having a horizontal upper bridging portion and a pair of leg portions extending downward from the horizontal upper portion, each leg portion having a distal end adapted for mounting on each member of the pair of trucks so that there is displacement of the bow portions as each member of the pair of trucks is displaced along the length of the members of the track; and (e) a flexible canopy supported by the bow portions for covering or uncovering the cargo space as each bow portion is displaced horizontally relative to the trailer along the length of the members of the pair of tracks. 2. The cover system of claim 1 wherein each member of the pair of trucks further comprises: (i) a carriage body, having an upper portion and a lower portion, the upper and lower portions separated by a flange extending from the upper portion; (ii) a support wheel mounted on the upper portion and adapted to be received in the first channel of each member of the pair of tracks, the support wheel providing rolling horizontal movement of the trucks along the track; (iii) a guide wheel mounted on the flange and adapted to be received in the second channel of each member of the pair of tracks, the guide wheel inhibiting yawing of the bow potions mounted on the truck as the support wheel moves along the track. 3. The cover system of claim 2 wherein each member of the pair of trucks further comprises a seal assembly secured to the underhang. 4. The cover system of claim 3 wherein the seal assembly further comprises a generally L shaped deflector having a first and second flexible flange extending from opposite sides of the deflector, the first flexible flange extending away from the deflector and towards the lower portion of each member of the pair of trucks. 5. The cover system of claim 4 wherein the support wheel rotates about a first axis and the guide wheel rotates about a second axis generally perpendicular to the first axis. 6. The cover system of claim 5 wherein the first axis is generally horizontal and the second axis is generally vertical. 7. The cover system of claim 5 wherein when one member of the pair of leg portions of the bow portions is moved along the track the flexible canopy expands or collapses in an accordion like manner. 8. The cover system of claim 7 wherein the first channel of the track has a groove directed towards the interior of the first channel and adapted to receive a strip and the support wheel bears upon the strip to provide smooth movement of the truck along the track. 9. The cover system of claim 8 wherein the strip is of a low friction coefficient material. 10. A corner bracket system for a generally U-shaped bow portion, the bow portion having a horizontal upper bridging portion and a pair of leg portions, the corner bracket system comprising (a) a corner bracket comprising (i) a central body portion with oppositely directed end faces interconnected by an inner and an outer curved web with a radial web extending therebetween; and (ii) A pair of tongues extending from each of oppositely directed end faces and each member of the pair of tongues offset from the inner and outer curved webs so as to define a shoulder with the inner and outer edges of each face; and (b) a pair of corner plates, each corner plate having a central body portion corresponding in profile to the central body portion of the corner bracket and a pair of extensions projecting outwardly therefrom; wherein the pair of tongues and the extensions are adapted to be received in the horizontal upper bridging portion and one member of the pair of leg portions. 11. The corner bracket of claim 10 wherein the inner and outer curved webs of the central body extend through 90�� so that the oppositely directed end faces are orthogonal to one another. 12. The corner bracket of claim 11 wherein the corner bracket and corner plates are obtained from a continuous extrusion having the profile of the corner bracket and corner plates.