| 摘要 |
The invention relates to a closing device ( 1 ) for a container (B) that comprises a bung-type lower part ( 2 ) with a cylindrical pour spout ( 20 ). The cylindrical pour spout has a female thread in which a cylindrical piercing element ( 3 ) that is open to both sides and that is provided with a male thread is retained by a screw connection. A screw cap ( 4 ) can be placed on the lower part, said screw cap being provided with drier means ( 44, 45 ) that interact with driver means ( 34 ) in the piercing element ( 3 ). A fine-pitch thread is provided between the screw cap ( 4 ) and the lower pan and a coarse-pitch thread between the lower part and the piercing element. The combined screw/translational motion of the piercing element and the selected threads produce a highly effective cutting motion. |
