| 摘要 |
A liquid dispensing device for use in the flush cistern of a water closet comprises a reservoir ( 13 ) for the liquid formulation which is fed from an inverted container ( 5 ) maintaining a constant liquid level ( 47 ) in the reservoir ( 13 ) at the mouth ( 37 ) of the container. A displacement body in the form of a piston ( 9 ), which may be magnetic, moves in a bore ( 56 ) to dispense liquid through opening ( 25 ). The piston ( 9 ) is moved by a float ( 11 ) which moves up and down as the level of water L in the cistem rises and falls on flushing. The float is coupled to the piston ( 9 ) magnetically. In another embodiment a direct mechanical coupling is used. Liquid seeps past piston ( 9 ) when in the lowered position, and is raised to overflow outlet ( 25 ) when the cistem fills. In another embodiment, liquid is dispensed on a downward stroke of the piston. The fit of piston ( 9 ) in the bore allows liquid to seep slowly past the piston to replenish the bore.
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