Abstract: A folding plastic box has two spaced parallel rails for supporting hanging files. Casters may be attached to the bottom of the box by plastic fasteners. The casters have base plates which fit fairly snuggly into the bottom areas of box-like cells formed on the bottom of the box. Plastic fasteners retain the casters in position. The walls of the box-like cells prevent lateral displacement of the casters. Also, the boxes may be transported on a dolly which has the casters attached to the bottom thereof.

Abstract: A foldable file box receives hanging files. In one embodiment resilient rails are removably inserted by flexing the rails and inserting their ends into sockets formed in the sides of the box. The file box has a bottom panel, a generally rectangular top channel frame, and inwardly collapsible side panels. An end panel at each end of the box is hinged to a corresponding end piece of the top frame. When they swing down to a vertical position, the end panels lock the collapsible side panels to erect the box. In order to receive and maintain a pair of file rails in a spaced parallel relationship, aligned sockets are provided at the ends of the rails so that the file rails may be inserted therein by flexing. Alternatively, the file rails may be integrally molded into the box. For portability, various rolling supports, such as easily attachable rollers or a dolly, may be added to the file box.

Abstract: A foldable file box receives hanging files. In one embodiment resilient rails are removably inserted by flexing the rails and inserting their ends into sockets formed in the sides of the box. The file box has a bottom panel, a generally rectangular top channel frame, and inwardly collapsible side panels. An end panel at each end of the box is hinged to a corresponding end piece of the top frame. When they swing down to a vertical position, the end panels lock the collapsible side panels to erect the box. In order to receive and maintain a pair of file rails in a spaced parallel relationship, aligned sockets are provided at the ends of the rails so that the file rails may be inserted therein by flexing. Alternatively, the file rails may be integrally molded into the box. For portability, various rolling supports, such as easily attachable rollers or a dolly, may be added to the file box.