| 摘要 |
<p>A closure for a vessel 103 designed to hold fizzy or gaseous liquid. The closure comprises of two parts, an inner portion 101 and an outer portion 102 which is moved between two different positions by a defined level of pressure in the vessel. The first position (Figure 2) is where the vessel can be opened as normal by a turning action and the second position (Figure 3) is where the outer portion of the closure is able to turn freely without opening the vessel. An element 9, such as a diaphragm, is configured to react to the pressure within the vessel and so move the outer portion between these two positions. Pressing down on the outer portion may reengage it with the inner portion via a series of opposing protrusions. The element may have means for indicating when the pressure within the vessel is fine to open the closure.</p> |
