Closure for wide-necked plastic drum

摘要

The closure for blow-moulded wide-necked plastic drums (2) uses a collar-type solid plastic closure ring (9) which rests against the underside of a solid border (10) which projects radially outwards from the drum wall with spacing below the drum opening, and a counter-ring (11) which is likewise made of plastic and rests on a flange (12) moulded onto the outer edge (4) of the lid at the bottom. Moulded onto the closure rings (9, 11) are retaining sleeves (13, 14) which are distributed over the circumference and engage in corresponding bores (15, 16) in the drum border (10) and in the lid flange (12). The closure rings (9, 11) and the retaining sleeves (13, 14) moulded thereon have conical through-bores (17, 18). To close the lid (1) fitted onto the wide-necked drum (2), tensioning bolts (19) made of plastic or metal are pressed from above by means of a pressing tool into the congruently aligned conical bores (18, 17) of the two closure rings (11, 9), the closure ring (9) resting against the drum border (10) being supported by an appropriate device. By means of the tensioning force exerted by the tensioning bolts (19), the lid seal (8) is pressed against the opening edge of the drum neck (3).