Abstract: Polypropylene hinges include hinge mounts for self-attaching them to the box and cover of a polystyrene container. The hinge mounts depend from hinge plates and are characterized by an outwardly protruding rigidly supported flange. The hinge mounts are generally matingly received in openings in the box and cover, and the flanges deform the openings to create notches receiving the flanges in an interengaging fit. Hinges also releasably detain the box and cover in a closed position by means of locking legs upstanding from one hinge plate and releasably capturing the other hinge plate to hold the hinge plates in a closed position. In a preferred embodiment, two locking legs having capture tabs receive the other hinge plate therebetween, the capture tabs capturing the other hinge plate to hold the hinge in its closed position.

Abstract: A polystyrene box comprising a cover and a container section and having a pair of polypropylene hinges and a polypropylene latch. The container section has a sidewall having a pair of hinge slots disposed therein, and the cover has a corresponding pair of hinge slots adjacently disposed thereto. Each hinge comprises a flexible top having a pair of legs and is disposed so that one leg fits into a cover hinge slot while the other leg fits into the corresponding container section hinge slot. Each leg has a protruding blade on its end opposite the top of the hinge and each blade has an outwardly extending flange which digs into the side of the slot when the hinge is fully inserted thereby securing the hinge to the box. The latch is comprised of a cover portion and a container portion each of which is separately connected to their respective parts of the box in the same manner as the hinges. The container portion of the latch has a front leg with a knob which is disposed outside the container section.