Closure seal for a container for storing dangerous liquid material
Exemplary embodiments include a seal between an open body end of a container body and an edge of a lid. The lid is pressable into the open end of the body in a sealing manner. The components may be made from a light gauge sheet metal. The lid can be removable affixed to the body. The seal is configured to securely attach to the body to provide a safe seal of the container to be capable of withstanding impacts, such as from a shock or fall. Accordingly, the embodiments are applicable to containers which contain hazardous materials.
1. A removable seal, comprising:
an open position and a closed position;
an upper body end of a container body and an edge portion of a lid, wherein in the open position the lid is insertable into the upper body end to form the closed position, wherein at the upper body end a terminal portion is bent outward by 180° providing a sharp body curvature, and an outer lid portion being radially spaced from a lid surface by a u-shaped channel and extending axially upward with a circumferential extending outer flank of the u-shaped channel and being bent outwards with a lid curvature being less than the sharp body curvature, the outer lid portion thereby forming a curved lid rim portion carrying an annular sealing material therein, the annular sealing material extending downwards, and wherein the lid rim portion has a free edge directed towards the outer flank, holding the annular sealing material and terminating at a radial distance from the outer flank, said radial distance allowing the sharp body curvature to enter into an interior of the curved lid rim portion in contact with the outer flank of the lid and the annular sealing material in the closed position, the terminal portion is being further bent radially to form a support shoulder comprising a shoulder surface rising radially outward and slanted upward suitable for supporting the annular sealing material in the closed position and further the terminal portion is bent axially downward from a peripheral radial end of the support shoulder, and then the terminal portion is rolled radially inward to create a curl outwardly adjacent to the upper body end.
2. The removable seal according to claim 1 , wherein the upper body end and one or more body specific elements of the seal are integrally formed from one sheet metal blank.
3. The removable seal according to claim 1 , wherein the lid and the upper body end are held in the closed position by corrugations in the outer flank and in the terminal portion in one of a positively locking manner or a frictionally locking manner under a radial preload.
4. The removable seal according to claim 1 , wherein in the closed position the upper body end with the sharp body curvature contacts the annular sealing material on an exterior of the outer flank of the lid.
5. The removable seal according to claim 1 , wherein a bending radius of the terminal portion that is rolled radially inward is selected such that the terminal portion that is rolled radially inward abuts against a circumferential radial protrusion of a body wall.
6. The removable seal according to claim 1 , wherein a diameter of the upper body end in an area of the sharp body curvature and a lid edge diameter in the area of a transition between the outer flank and the curved portion are matched, so that in the closed position the upper body end with the sharp body curvature will abut inwardly at a transition between the outer flank and the curved portion, while being under a radially inward tension.
7. The removable seal according to claim 1 or 6 , wherein the annular sealing material is a swelling compound.
8. The removable seal according to claim 1 , wherein the terminal portion between the support shoulder and the curl is formed into at least one of a radially or axially protruding lug.
9. The removable seal according to claim 8 , wherein the at least one radially or axially protruding lug is shaped to provide an opening aid for the lid.