Abstract: A closure device for a container having a lid hingedly attached at an attachment edge between one lower edge of the lid and a corresponding upper edge of the container comprises a spring means pivotally connected at a first end at a pivot point to a wing means capable of secure attachment to a hinged brace means. The brace means is mounted at its respective ends to an inside wall of the lid and a corresponding inside wall of the container. A second end of the spring means is adapted to be mounted on the inside wall of the container at such a distance from the brace means that when the lid is in a closed position the angle at the pivot point beneath the point exceeds 180 degrees, and when the lid is in an open position the same angle is less than 180 degrees.