Abstract: A plastic box closure device for releasably engaging the flaps of a box has a lower element with portions extending in a first plane, and an upper element connected to the lower element by a web which spaces the two elements apart to receive parts of the container flaps. The upper element may be concaved such that the outer portions are biased against the flaps received in the device. The upper element may alternatively have downwardly extending resilient fins to engage the flaps within the device. The device is preferably constructed to be fabricated in a plastic or similar extrusion process.

Abstract: A box closure device releasably engages the flaps of a box in a closed configuration. The device has a lower element which extends generally in a first plane. An upper element is connected to the lower element and spaced substantially parallel to it by a central stem, such that portions of the box flaps are engaged between the upper and the lower element. A tab is connected to the upper element along a living hinge and is pivotable about the hinge from a first position extending substantially in the same plane as the upper element, to a second position which extends upwardly from the upper element, such that the tab may be engaged to assist in the rotation of the device when being installed in a box, and, when released, the tab returns to the first position. The lower element may be a planar disc, or may be cupped.