| 摘要 |
<p>A dispenser (10) comprises a container (12), a weighted base (14), four support members (16) and a valve comprising a float (18) and a plug (20). An outlet opening is defined centrally in the floor (26) of the container, through which a dosing liquid in the container can be discharged into a cistern. When the water in the cistern is above a predetermined upper water level the float (18) keeps the plug (20) lodged in the outlet opening, thereby closing off the outlet opening. When the water in the cistern falls below the upper water level but is still above a predetermined lower water level (as the toilet is being flushed) the float (18) drops and the plug (20) is dislodged from the outlet opening allowing dosing liquid to be discharged into the cistern. As the cistern empties, the float (18) drops and the plug (20) becomes lodged in the outlet opening again, thus closing off the outlet opening.</p> |
