| 摘要 |
The present invention is directed to a closure for a container. In one of the embodiments provided herein, the closure is provided with a cap having a roof portion and a cylindrical skirt. A well extends from the roof portion into the cap, the well having an inner wall structure that terminates at an edge and a frangible valve joined to the well by a frangible section that extends about a first portion vicinal to a periphery of the frangible valve and by a non-frangible section that extends about a second portion vicinal to said periphery. In another embodiment the frangible valve is defined as a dish-like member positioned at an inclination relative to a central axis defined by the well, such that the frangible section is joined about the inner wall structure of said well and the non-frangible section is joint about the edge of the well. Since the non-frangible section is stronger than the frangible section it does not substantially separate from the inner wall when the frangible valve is moved to an open position. In a further embodiment, the cap has a well having an inner wall structure that terminates into a base structure at an edge, the base structure having a frangible valve defined as having a frangible section that extends about a first portion vicinal to a periphery of the edge and having a non-frangible section that extends about a second portion vicinal to said periphery of the edge.
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