Water-saving single-chamber flushing cistern for toilets

摘要

By enforcing saving measures in the household, 10% of the amount of water supplied, which in 1981 amounted to 3,647 million cubic metres, can quite easily be saved in just a few years. However, saving drinking water when flushing the toilet, which accounts for 32% of the total amount of water supplied, conflicts with DIN standard 19542, the revised version of which is planned. Up until now, industry therefore saw no necessity to concern itself with water-saving technologies, so that a definitive judgement still cannot be passed on the numerous patent applications. The designs presented by companies at the ISH in March 1983 in Frankfurt can only be regarded as stopgaps with respect to the universal demand to save drinking-water. The suggestion to the effect that the flushing process can be interrupted by the user at will must be regarded as nonsense. The majority of patent applications are based on a two-chamber system, which fulfils the demand for a metered discharge of water but which would give rise to additional costs for the manufacturers of flushing cisterns as a result of changes in production. With the present invention, the inventor has complied with the demand for a metered discharge of water (about 3 litres for the short flushing process and about 9 litres for the long flushing process) in that he has only completely redesigned the prior-art outlet device (bell), but has retained the basic elements of the bell. In this way, it is possible for only that amount of water necessary for the respective flushing actually to be discharged. The user is not thus continually faced with the necessity of having to fix himself/herself how much water is to be used for the respective flushing. This invention thus fully complies with the demand for saving drinking water while observing hygiene regulations.