| 摘要 |
A flush toilet which uses waste water instead of tap water when waste water is available. An auxiliary tank (2) holds water collected from wash basins (12), bath tubs, washing machines, or business or industrial machinery. A first float (6) inside the auxiliary tank (2) halts tap water flow when the auxiliary tank (2) is full, a second float (7) inside of the main tank (1) opens up a valve to receive the waste water when the main tank (1) is empty. The normal refilling float is also used. Other embodiments have the waste water flowing directly from the auxiliary tank (2) into the drain (5) for the flush, without being held in the main tank (1) in between, thus keeping the main tank (1) clean. The tap water supply pipe (4a) may be located within the auxiliary tank (2), the main tank (1), or in between the two, and the valves may be located and arranged in various ways. The tap water supply may have a second valve and outlet which feed directly to the drain (5), in order to aid flushes using waste water. In some embodiments, one float controls both the waste water supply valve and the second tap water valve and outlet, using in-line valves or a cam to differentially control the action of two valves. The first float (6) may have apparatus, such as a ring and chain, to prevent it from rising to shut off the tap water supply, and thus prevent the use of waste water for flushing. The auxiliary tank (2) may also have a sloped bottom and drain plug to allow easy cleaning, in the preferred embodiment, the mouth of the waste water supply pipe (3) which carries waste water to the main tank (1) or drain (5) is placed above the sloping bottom so as to avoid ingestion of foreign material from the wash basin, washing machine, etc. The mouth of the waste water supply pipe (3) is also equipped with a check valve to prevent a back flow from the main tank (1) into the auxiliary tank (2). |
