Siphon assemblies

Details Siphon assemblies Siphon assemblies

1999-06-22

2001-07-10

Michalsky, Gerald A. (Department: 3753)

Baths, closets, sinks, and spittoons

Flush closet

Tank only

C004S415000, C137S143000, C137S148000

Reexamination Certificate

active

06256801

ABSTRACT:

This invention relates to siphon assemblies for flushing cisterns, said assemblies comprising an inverted generally U shaped duct having an up leg and a down leg the up leg being provided with an enlarged chamber having a lower end open to the interior of the cistern in use and the down leg forming an outlet from the cistern in use for delivery of flushing water to an associated W.C. pan or the like. A vertically displaceable piston commonly incorporating a flexible diaphragm of, for example, rubber or plastics material acting as a one way valve, is movable in said chamber to initiate a siphonic flushing action discharging water from the cistern in operation in well known manner. Such a siphon assembly is hereinafter referred to as “a siphon assembly of the kind described”.
Current practice attaches increasing important to economy in water use, there have been substantial increases in the cost of water supply in recent years, many supply undertakings are metering supplies so that charges are directly related to usage, and building and other regulations are making use of modern economical appliances mandatory for new installations. Modern designs of W.C. pans have been evolved which will flush efficiently with a much less volume of water than older designs and U.K. building regulations are being brought in or under active consideration imposing a requirement that all new W.C. installations shall operate with a maximum flush volume of 7.5 liters of water instead of the 9 liter volume which was common for older patterns of W.C. Siphon assemblies therefore need to be designed to deliver this lesser volume.
There will continue to be a substantial market for siphon assemblies for the older patterns of W.C. already installed for many years to come. For economy of manufacture and economy of stocking by builders merchants and the like there is therefore a need for a siphon assembly which can readily be adapted to deliver either a higher or a lower flush volume e.g. can be selectively changed over to deliver either 9 or 7.5 liters. Proposals for such adaptable siphon assemblies are described in GB-A-2213846 and in GB-A-2270528 involving the provision of an aperture at an intermediate level in a side wall of the up leg chamber which can be selectively closed by inserting a removable snap fitting sealing plug or by means of a flap or shutter. With the aperture closed the siphonic action will continue until the water level in the cistern falls below the open bottom of the chamber, whereas with the aperture open the siphonic action will cease when the cistern water level falls below the level of the aperture, the latter allowing air to enter the chamber and so terminate the siphonic action when a lower volume of flushing water has been delivered.
However such known siphon assemblies only allow for two flush levels. The flush level being the level to which the cistern water has fallen when the siphonic action ceases. The flush volume is dependent, amongst other things, upon the flush level and also the cross-sectional area of the cistern within which the siphon assembly is installed. Thus, the installation of a siphon assembly according to GB-A-2213846 or GB-A-2270528 into a cistern of different cross-section area will produce an incorrect flush volume.
The object of the present invention is to provide an adaptable siphon assembly of the kind described which is of simple construction, economical to manufacture, and which can be readily adapted to provide a predicted flush volume, e.g. 9 liter or 7.5 liter for a wide range of cisterns.
According to the invention there is provided a siphon assembly as defined by claim
1
of the appended claims.


REFERENCES:
patent: 2270528 (1994-03-01), None
patent: 2273510 (1994-06-01), None
patent: 2275483 (1994-08-01), None
patent: 2275697 (1994-09-01), None
patent: 2304742 (1997-03-01), None

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