| 摘要 |
The pump is designed to be mounted on a receptacle, and comprises a pushbutton that is movable between a high position and a low position relative to a pump body, and that co-operates therewith to define a pump chamber of variable volume. The pump body has a vent suitable for communicating via a passage with the outside of the receptacle when the pushbutton is in an intermediate position between its high position and its low position, thereby enabling air to enter the receptacle while the substance is being sucked into the pump chamber. The pushbutton has an inner skirt integrally formed therewith and suitable for sliding in sealed manner inside the pump body, the inner skirt being shaped so as to isolate said vent from the outside when the pushbutton is in its high position and when it is in its low position.
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