| 摘要 |
The lid of a beverage can has two punched segments, breaking of which forms the respective openings for allowing the liquid to flow out and the air to enter. Breaking of these punched parts is performed by pivoting upwards a main ring mounted on a rivet of the lid and, after breaking open the punched part, pushing downwards a secondary lever with cutting pressure pieces which cut into the punched parts so as to cause breakage thereof. The said secondary lever is mounted on the same rivet, having an end segment which rests against a stop of the ring in order to prevent in the rest condition the pressure pieces cutting into the punched parts. In another simpler embodiment, the secondary lever is dispensed with, so that the pressure piece is incorporated along the contour of the associated main ring.
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