Recycle bin carts have been around for several years. The traditional PVC carts use four vertical pipes, two in the front and two in the back, to connect the bottom tray to the top tray. The bins rest on these trays. This is a strong frame, but the two pipes in the front make it harder to put the bottom bin on its tray, specially the modern recycle bins which have large handles, thus forcing the cart to be extremely wide to allow the handles to go past these two vertical pipes. My new cart features an open, pipe-free front. This is achieved by setting back the two front pipes, so the bin handles do not need to go past such pipes, and the cart does not need to be too wide. It's also easier to place the bottom bin on its resting position on the tray. My cart also sets the bottom tray closer to the floor, and the top tray higher, which allows for a 12 inch gap between the bins, making filling them up easier.
Pipes: PVC (Poly Vinyl Chloride) Schedule 40, pre-manufactured, usually ¾ inch. Fittings: PVC Schedule 40. “Tee” fittings used: 16 units. “Elbow” fittings used: 10 units. The pipes fit tightly into the fittings and are also glued to them with PVC solvent cement. Wheels: usually, solid molded plastic, 6 inch by 1⅜ inch. They are attached to the frame by two 5/16 inch by 3¼ inch steel screws and safety locknuts, either stainless or galvanized steel. The cart stands in an upright position, slightly tilted back to keep the recycle bins from falling forward. The two “Tee” fittings of the bottom tray are also the legs that touch the floor.