Title: Dual flush apparatus for water closets

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Abstract: A dual flush apparatus for selecting one flushing mode in which all the water in the toilet tank is drained or another mode wherein only a portion of the water is drained. A toilet valve actuating handle is bistable so that it is yieldably biased to two positions. It is linked to a toilet flushing valve so that it can open the valve and in one of its bistable positions apply a force on the valve and in the other not apply such a force. Depending upon the particular valve structure to which the handle is linked, the force which the handle applies, when applied either prevents or enables the premature closure of the valve at an intermediate water tank level. One flushing mode occurs when the handle force is applied and the other mode occurs when the force is not applied. A conventional pivotable ball valve is modified by providing an air escape hole into the ball below its valve seal to permit controlled entry of water into the valve so that its buoyancy changes at an intermediate water level allowing it to prematurely close if the valve actuating handle is appropriately positioned.


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