| 摘要 |
The invention relates to a closure device for mounting on the screw-threaded cylindrical opening of a container, comprising inner and outer closure members 3 and 2 which have first drive means 8, 9 for turning the device in the clockwise sense to mount the device on the opening and second drive means comprising a hexagonal projection 13 and a hexagonal orifice 12 which are engaged on applying axial pressure on the device and which, on applying an anti-clockwise torque cooperate to unscrew the device from the opening. …<??>The orifice 12 may be initially closed, or partly so, by a cover secured to the boundary of the orifice by frangible connectors which are fractured by the projection 13 on initial axial pressure being applied. This provides a tamper evident feature. …<??>In other embodiments, a cover has a manually graspable tab for tearing it from the opening before axial pressure is applied. |
