| 摘要 |
Safety closure device (1) for a container. On initial dpression of the outer cap (3) of the device when on a neck of a container, the lower (as viewed) surface of the disc (18) bears on the upper surface (as viewed) of the boss (17), which boss has a greater diameter than the disc (18) but a smaller diameter than the circular aperture in the end member (5) in which the disc (18) is situated. The boss (17) rides into the aperture, bearing on the lugs (19 and 20) and rupturing them, the pressure being considerably increased where the lugs bear on the sharp edge of the lug at the transition from the upper surface to the boundary wall thereof. The disc (18) is now released and, when the lugs (19 and 20) rupture, tends to "spring" out of the aperture and away from the closure device, thus leaving a circular hole behind. This indicates that operation of the device to remove it from the container had been effected or attempted, and the effect is enhanced by the red colour of the boss showing the aperture in constrast to the white of the outer cap (3). A seal (21) of the device (1) provides a comprehensive seal of the opening as it can flex to accommodate any shape of mouth of the opening, including where the outer edge thereof is angled or curved towards the centre. |
