Baths – closets – sinks – and spittoons – Flush closet – Bowl
Patent
1995-09-14
1997-08-19
Walczak, David J.
Baths, closets, sinks, and spittoons
Flush closet
Bowl
4435, E03D 102
Patent
active
056574959
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a trap-forming device intended, in particular, to be inserted between two lengths of pipework for evacuating waste water.
Such traps are known that comprise a body having an inlet orifice or upstream orifice that communicates with an upstream length of the pipework, and an outlet orifice or downstream orifice that communicates with a downstream length of the pipework.
Between the inlet orifice and the outlet orifice, such a known trap is constituted by a hollow body defining an upwardly-directed tubular portion followed by a downwardly-directed tubular portion that runs into the outlet orifice. At the junction between the two tubular portions, the body defines an overflow edge that is situated above the inlet orifice.
When a fluid flows through the body, the fluid must pass over the overflow edge in order to reach the outlet orifice.
Consequently, when the upstream length extends to a level which is situated above the overflow edge, as happens in pipework for evacuating waste water, a certain quantity of fluid is retained after the flow has stopped in the upwardly-directed tubular portion of the trap and in the upstream length situated beneath the level of the overflow edge.
In other words, the upwardly-directed tubular portion of the trap constitutes means for retaining a fluid barrier that serves to prevent bad smells that occur in the downstream length from being transmitted into the upstream length.
Clearly if the fluid barrier itself includes evil-smelling elements, then bad smells can propagate in the upstream length.
In order to avoid such a drawback, it is therefore necessary for the barrier to be constituted by clean fluid.
To this end, waste water is evacuated using a relatively large flow of clean water so that at the end of evacuation the fluid is constituted in practice solely by clean water.
At present, for ecological, climatological, and economic reasons, it is desirable to reduce consumption of clean water, and consequently, unnecessary consumption of clean water for evacuating waste water is becoming a major problem.
That is why attempts have been made over the last few years to reduce the quantity of water that is used to clean a toilet bowl provided with a trap.
Certain devices exist at present that make it possible to use only five liters of water where previously it was necessary to use seven or even eight liters of water.
Nevertheless, this quantity of water must suffice to clean the toilet bowl and the trap properly.
Cleaning is considered as being proper if it satisfies Standard NF-D-126201 which defines test methods and specifications for measuring suitability for use in toilet bowls.
That standard takes the following four criteria into consideration:
the effectiveness of evacuation;
the renewal of water in the trap;
the quality of wall rinsing; and
splashing out from the bowl.
It turns out that when tests are performed with reduced quantities of cleaning water, the bowls tested do not comply with the standard because the criterion for trap water renewal is not satisfied.
In other words, the trap normally used with such bowls constitutes a critical point in reducing the quantity of water required for cleaning a toilet bowl.
Consequently, there exists a need for a trap in which renewal of the barrier-forming fluid is sufficient and which enables the quantity of water required for cleaning a toilet bowl to be reduced while still satisfying Standard NF-D-12-201.
An object of the present invention is therefore to provide a novel type of trap-forming device in which the renewal of water during waste water evacuation by means of a quantity of clean water is satisfactory and enables it to be used with a toilet bowl.
To this end, the present invention provides a trap-forming device having a hollow body including an upstream orifice situated in the bottom portion of the body and communicating with an upstream length of fluid evacuation pipework, retaining means defining an overflow edge and co-operating with a portion of the upstream length to retain a quant
REFERENCES:
patent: 3482267 (1969-12-01), Liljendahl
patent: 3984080 (1976-10-01), Varis et al.
patent: 4357719 (1982-11-01), Badger et al.
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