Baths – closets – sinks – and spittoons – Flush closet – Bowl
Patent
1998-12-31
2000-09-12
Fetsuga, Robert M.
Baths, closets, sinks, and spittoons
Flush closet
Bowl
4420, E03D 1102
Patent
active
061158534
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a toilet wherein a toilet bowl is cleaned by using flushing water which conveys filth in a bowl part of the toilet bowl to the outside of the toilet bowl.
BACKGROUND ART
An ordinary toilet is arranged with a tank in which flushing water for cleaning the toilet bowl is stored and discharged into the toilet bowl. Filth present in the toilet bowl is flushed directly through a drain and conveyed to the outside of the toilet bowl by the flushing water under the pressure thereof. An alternative arrangement has a generally-known siphon flow conduit which is formed so as to curve upward above the toilet bowl and, when the flushing water is discharged, the flushing water fills the siphon flow conduit up to the curved part, generating a siphon effect. With the addition of the siphon effect, filth is drawn into the outlet and conveyed to the outside of the toilet bowl. In this case, the flushing water in the bowl part is conveyed together with the filth, thereby also cleaning the toilet bowl. Usually, for the flushing water in the tank to thus convey the filth and also clean the toilet bowl, ten or more liters of water needs to be stored at a height of around 30 cm to impart the necessary potential energy to the stored water.
However, in recent years the increasing population concentrations in major cities and global irregularities of climate and weather have made it difficult to provide stable supplies of water for everyday use. This has caused local authorities and governments to impose restrictions on the use of water in a number of areas, or call for less water to be consumed. Defecation toilet bowls have not been exempted. In the United States, for example, in 1994 the government changed the regulations to lower the volume of water used to flush a toilet bowl from 3.5 gallons (about 13 liters) to 1.6 gallons (about 6 liters), and measures aimed at consuming less water are also being imposed by Taiwan and Singapore. In Japan, also, ways are being studied to reduce water consumption, on a city, town and village basis.
A common method of economizing on water consumption is to place a brick in the flushing water tank to reduce the visible amount of water that is stored. However, this is not really an adequate answer, since the result is that there is not enough water to properly clean the toilet bowl.
A number of proposals have been made in response to the need to economize on water consumption, including JAPANESE PATENT LAYING-OPEN GAZETTE 54-18137 and JAPANESE PATENT PUBLICATION GAZETTE 6-99952. These disclosed techniques comprise a subtank which is to be installed inside an existing flushing water tank so as to store the flushing water applied with about the same degree of pressure as the water service supply pressure. When the toilet bowl is being flushed, the subtank water thus subjected to pressure giving it energy equivalent to the water service supply pressure, is discharged into the toilet bowl. Although this enables the amount of flushing water to be decreased, the size of the flushing water tank has to be increased by a volume enough to allow the subtank to be accommodated. So that, there have been some cases wherein such toilet as above cannot be installed in small toilet rooms. Also, in the case of low-silhouette type toilets wherein the water tank is positioned lower down to allow it to be integrated with the toilet bowl, design constraints mean that it is difficult to make the water tank large enough to accommodate a subtank. Moreover, when the flushing water under pressure in the subtank is just about enough to clean the toilet bowl, it can take quite a time for the flushing water to fill the subtank. As such, when the toilet is being consecutively used and flushed by a number of users, each user has to wait for the subtank to fill.
JAPANESE PATENT LAYING-OPEN GAZETTE 5-311719 discloses another technique. The technique comprises a horizontal waste trap, wherein the horizontal conduit has an upward bend before connecting with the drain outlet, to pr
REFERENCES:
patent: 4142262 (1979-03-01), Hamilton
patent: 5204999 (1993-04-01), Makita et al.
Fujino Kiyoshi
Fukushima Takenori
Kataoka Yumiko
Miyahara Hidetaka
Shibata Shinji
Fetsuga Robert M.
Toto Ltd.
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