Baths – closets – sinks – and spittoons – Flush closet – Bowl
Patent
1997-06-24
1999-07-06
Walczak, David J.
Baths, closets, sinks, and spittoons
Flush closet
Bowl
4424, 4428, E03D 1100
Patent
active
059183250
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to a flush toilet bowl and, more particularly, a flush toilet bowl of a type which discharges sewage by a syphoning action.
2. Background Art
In regard to such a type of flush toilet bowl, a wide variety of constructions have hitherto been known, a typical one being described in JP-U Sho-58-25381. The flush toilet bowl described in this publication is called the syphon jet type. The water discharge trap of the toilet bowl has a stepped part in a descending path and is transversely bent substantially at a right angle on the downstream side of the stepped part. Thereafter, a discharge opening opens vertically (hereinafter, such a discharge trap is referred to as a cross-laid type trap).
In this type of flush toilet bowl, the stepped part provided in the descending channel of the discharge trap causes a disturbance of water flow and forms the wall of water (seal), thereby producing a syphoning action. Hereupon, a principle of syphoning action will be explained. At the stage before flushing, the interior of the discharge trap is under an atmospheric pressure which is the same as that on the surface of the gathered water. The supplying of flushing water to this place causes the disturbance of water flow due to the stepped part, thereby forming a wall of water (seal) which closes one end of the trap.
When the supply of water continues in a condition of the seal being formed, air within the trap is discharged together with water and the pressure within the trap becomes negative with respect to the atmospheric pressure. This negative pressure causes a drawing force. As the discharge of air further proceeds, the trap is substantially filled with water and, at this time, the maximum drawing force occurs. Namely, a phenomenon of syphoning is produced by the initial seal, grows by the discharge of air and puts forth the maximum drawing force when the trap is filled with water. So, realizing the rapid production and growth of the syphoning action is important in order to save the amount of the flushing water.
Particularly, in the case where the position of the flush tank in the flush toilet bowl is attempted to be lowered for low-silhouetting the bowl, the potential energy of flushing water naturally becomes smaller, and so, in order to save an amount of flushing water, the realization of the above-described rapid production and growth of the syphon is all the more important. Moreover, ensuring a high capacity of water discharge is required.
Now, as a toilet bowl having a construction of air within the discharge trap being discharged early in order to ensure the early production of the syphon, there is one such type disclosed in U.S. Pat. No. 5,142,712.
This toilet bowl is provided with a cross-laid type discharge trap in a similar way to the toilet bowl disclosed in the above-described JP-U 58-25381. The cross-laid channel is bent upwardly before the discharge opening to provide a gathered water part before the discharge opening, in which a seal part is constituted. The air existing between the sealed water part and the above-described gathered water part is drawn under a negative pressure produced within the sealed tank by the discharge of the water within the sealed tank, so that the air within the trap is discharged, thereby ensuring the early production of the syphoning action. In this connection, the reason why a ventilation room is provided in the gathered water part in such a toilet bowl, is that there occurs the following disadvantage: If there is no ventilation room, because of the seal being always constituted at two points, a phenomenon of syphoning occurs in a considerably easy way. For example, in the case where a negative pressure occurs in the discharge pipe, such a negative pressure sucks and discharges not only the water in the gathered water part, but also the sealed water per se in the toilet bowl, so that odor from the discharge pipe reversely flows into the chamber by way of the bowl part of the toilet bowl.
However, the toilet
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Arita Kinya
Matsushita Hiroyuki
Shibata Shinji
Tsukada Ryouichi
Toto Ltd.
Walczak David J.
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