| 摘要 |
A closure member, for use with a flexible, resilient, container. The closure member provides an inlet orifice and an outlet orifice to the container and an expansible chamber for containing displacement fluid. The outlet orifice is constructed to communicate directly with the interior of the container, to permit outflow of material when the container is squeezed, and to prevent inflow of displacement fluid. The inlet orifice is constructed to communicate with the expansible chamber, to permit inflow of displacement fluid to the expansible chamber when the container wall returns to original shape after being squeezed, and to prevent outflow of displacement fluid. A flexible bladder, initially collapsed, forms the expansible chamber. The closure member includes structure to which the bladder is attached and which contains the initially collapsed bladder, and structure that inhibits the bladder from sealing off the outlet orifice from the contents of the container. The structure that contains the initially collapsed bladder can be elongated to limit the extent to which the container can be flexed.
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