| 摘要 |
The invention provides a device for converting a single volume cistern into a selective volume cistern adapted to selectively allow both low volume and high volume flushes wherein the single volume-cistern is of the type having a water inlet, a water outlet, a valve mechanism operationally linked to a float lever arrangement for controlling the amount of water flowing into the cistern, a flush actuating means and a flushing mechanism operationally linked to said water outlet, said device comprising a hollow vessel provided with an opening at its upper end for the entry of water therethrough and being adapted to be inserted into the flushing cistern in a first normally closed rest position which at least partially surrounds the flushing mechanism and forms an open ended water column extending above and around said water outlet to exclude a portion of the water in said cistern from passing through said water outlet while said vessel is in said first position for low volume flushes and wherein at least a section of the upwardly extending surface area of said vessel is adapted to be tilted and pivotally displaced from said first rest position to a second displaced open-position to form a multidirectional opening for the rapid passage of water under the lower edge of said tiltable section, a portion of said tiltable section being adapted in its displaced position to intersect the arc ascribed by a water level responsive float means whereby said portion is adapted to be engaged by said float means in its downward arc upon the emptying of the cistern and to be retained in said displaced position during the entire flushing action and until the completion thereof whereafter the rising water in the refilling cistern lifts said float means away from said section and allows said section to automatically return to its initial closed rest position.
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