| 摘要 |
A bottle closure device comprising a valve body provided with a seat co-operating with an inverted mushroom headed valve shutter. An externally threaded cap support is rigidly secured to the valve body to receive an internally threaded cap provided with an axial pin having longitudinal ribs able to engage into an axial cavity in the stem of the shutter in such a way as to engage therein to cause the rotation of the shutter with respect to its seat upon unscrewing of the cap. For the purpose of ensuring engagement between the pin and the valve shutter the ribs have sharp outer edges and are of such a size and shape that they engage with interference against the walls of the axial cavity, which has a circular cross section, when the cap is fully screwed on to the cap support.
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