| 摘要 |
A device ( 2 ) for fitting to the neck of a deformable bottle ( 4 ) to give a metered dose of liquid when the bottle is squeezed. The liquid dispensed through outlet ( 30 ) has to pass through a metering chamber ( 34 ) in which it is directed around or through a freely-moving shuttle ( 8 ), movement of the shuttle ( 8 ) with the flow being resisted by the creation of a partial vacuum in the expanding control chamber ( 42 ) behind the shuttle, so that the rate at which the shuttle moves to the outlet end of the metering chamber ( 34 ) to close the outlet ( 30 ), and hence the amount of liquid dispensed, is controlled by the rate at which liquid can enter control chamber ( 42 ). Because it is configured so that all the liquid enters metering chamber ( 34 ) at its inward end, the chamber may fitted either inside or outside the neck of the bottle ( 4 ) and the dose may be adjusted by moving the outlet ( 30 ) closer to, or further from, the inlet.
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