Abstract: A hardtop roof assembly for a passenger vehicle. The roof assembly includes a hard cover over the passenger cockpit. The cockpit cover is completely removable from the remainder of the roof assembly and vehicle and can be selectively secured over the opening above the passenger cockpit or to a rear storage rack for transport with the vehicle. Because it is completely removable, the cockpit cover can also be stored inside the vehicle or left at home if desired. The cockpit cover uses common securing members to selectively secure it over the opening above the passengers or to the rear storage rack. The cockpit cover and storage rack also have corresponding shapes that assume a neat, strong, and compact mating relationship when secured to each other. Additionally, the side edge portions of the cover and storage rack have vertically extending surfaces that abut and substantially mate with each other to add lateral stability and prevent any side-to-side movement of the cover when it is secured to the storage rack.

Abstract: A wheelchair back assembly suitable for detachable mounting to the back-supporting posts of a wheelchair. The back assembly includes a relatively rigid shell member carrying post-engaging hooks and a plurality of mounting units formed to be mounted on the wheelchair posts. The mounting units are further formed to slidably receive and automatically releasably lock a pair of the post-engaging hooks on the shell member to the posts against unintentional removal of the back assembly from the wheelchair during normal use of the wheelchair. The mounting units are also formed for single-handed automatic unlocking and release of the pair of hooks from the mounting units and posts upon rotation of the shell member forwardly over the wheelchair seat by an amount in excess of any displacement occurring during normal use of the wheelchair.

Abstract: An extrusion is provided which includes an upper double sidewall and a lower bulbous portion forming an integral pallet structure. This extrusion can be cut to suitable lengths and welded at the corners to form a sealed rectangular container bottom. A bottom panel is welded around its peripheral edge to the extrusion lengths. Reinforcing I-beams can be placed across the bottom and laterally spaced openings can be cut in the ends and sides of the bottom portions for receiving fork-lift tines. These cut-out portions can be reinforced by tubes or channel members, as required. This structure minimizes the critical welding required to make a sealed container bottom, since only the corner welds and the bottom panel welds are located where air leakage can occur.