| 摘要 |
<p>The invention provides a pressure safety closure assembly for carbonated beverage containers, the assembly comprising: a container neck (10); a closure (12) for the neck; first and second screw threads (14, 16) on said neck (10) and closure (12); the second screw thread (16) being engageable with the first screw thread (14); means for forming a seal between the neck (10) and closure (12) when the closure is screwed down on the neck; mutually engageable elements on the neck and closure to block or restrict rotation of the closure (12) in an unscrewing direction beyond an intermediate position when the closure is under an axial pressure in a direction emerging from the container neck; means to allow gas venting at the blocked intermediate position; and the assembly further comprising locking means (18, 19) on the container neck and closure (12) to retain the closure screwed down on the neck (10) until an external screwing torque is applied to the closure. <IMAGE></p> |
