Collapsible containers

Improvements on collapsible containers comprising a box-like prismatic structure formed by a floor section, a top section, a pair of sidewalls connected by hinge means to said floor section and said top section, respectively, along a central hinge line to define portions of equal surface area in said sidewalls adapted to be folded upon themselves and toward the interior of the container, with the ends of the structure closed by respective door members or end portions pivotably mounted and adapted to be folded backward toward the interior of the container, with said top section and said floor section comprising a profiled frame with generally prismatic corner brackets which form engaging means used in hoisting the container, and with the container walls provided with cooperating locking members to keep the walls rigidly connected in the assembled position of the container, characterized in that said door members or end portions are mounted so that they can pivot or swivel toward the top section of the structure on coaxially disposed pivot pins extending from opposite sides of said top section, that the hinge members of the sidewalls engaging the floor section and the top section, respectively, are formed by a pair of sets of U-shaped oppositely oriented plates, that the legs of the plates of one of the sets are integral with the hinge means rigidly connected to the legs of a U-shaped profile forming part of the sidewalls, whereas the legs of the plates of the other set are connected to the legs of a U-shaped profile forming an integral part of said top section, that a set of U-shaped plates of said hinge means is rigidly joined with a hinge line extending across the U-shaped plates of the other set and adapted to move freely with respect to said hinge line, that the intermediate portions of said U-shaped plate form an enclosure of the hinge means in said U-shaped profiles integral with the respective sidewall and the top section in the assembled state of the container, that the plates of the two sets remain connected and pivotable around said axis in a second, collapsed state of the container, and that the frames forming the top section and the floor section are provided with supports for connecting corresponding protruding locking means extending from the frames of said sidewalls and from the door members or end portions of the container.