EP1423573B1 - Cistern assembly and a cistern - Google Patents
Cistern assembly and a cistern Download PDFInfo
- Publication number
- EP1423573B1 EP1423573B1 EP02765011A EP02765011A EP1423573B1 EP 1423573 B1 EP1423573 B1 EP 1423573B1 EP 02765011 A EP02765011 A EP 02765011A EP 02765011 A EP02765011 A EP 02765011A EP 1423573 B1 EP1423573 B1 EP 1423573B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cistern
- assembly
- flush
- valve
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D1/00—Water flushing devices with cisterns ; Setting up a range of flushing devices or water-closets; Combinations of several flushing devices
- E03D1/01—Shape or selection of material for flushing cisterns
Definitions
- the present invention relates to a cistern assembly and a cistern. More particularly, the present invention relates to a cistern assembly for a toilet comprising a cistern and a non-syphonic type valve.
- the cistern is capable of installation and operation at a relatively low level relative to the toilet bowl in order that, for example, the upper surface of the cistern is lower than the top of an adjacent sink unit, thereby enabling a cabinet or shelf housing the cistern to have a surface arranged at sink height, for example, for storage purposes. As such, this means that a lower head of water is available to achieve effective flushing.
- the present invention seeks to overcome, or at least mitigate the problems of the prior art.
- One aspect of the present invention provides a cistern for a toilet, for use with a dual flush valve enabling a user to select a relatively high volume of flush water or a relatively low volume of flush water; the cistern comprising a lower portion having a relatively small cross section area and an upper portion having a relatively large cross section area wherein in use said relatively low volume of flush water is substantially equal to the volume of the upper portion and said relatively high volume of flush water is supplied from a combination of the upper and lower portions.
- the cross section areas are substantially constant for each portion, thereby defining a step between the upper and lower portions.
- the lower and/or upper portion may have a non circular cross section which may be a substantially rectangular cross section.
- the upper and lower portions may be defined by substantially flat back and substantially flat front walls in a spaced apart relationship; they may be spaced apart by less than 150 millimetres, preferably less than 120 millimetres.
- the upper and lower portions may be defined by a first and second lower side wall and a first and second upper side wall, the step being defined between one of the first lower and first upper side walls, and/or between the second lower and second upper side walls. In this case, the step may be defined between the first lower and first upper side wall and being further defined between the second lower and second upper side walls.
- the lower side walls are spaced apart less than 400 millimetres, preferably less than 350 millimetres, preferably less than 325 millimetres.
- the upper side walls are spaced apart less than 500 millimetres, preferably less than 450 millimetres, preferably less than 430 millimetres.
- the cistern has a top portion having a cross section area smaller than that of the upper portion; the top portion may include attachment features.
- the invention comprises a cistern assembly including the above described cistern of the invention and an outlet valve secured to a base of the cistern, the valve having an operating mechanism, said operating mechanism being provided above the base of the cistern.
- the cistern assembly may comprise a valve of the dual flush type, enabling a user to select a relatively high volume of flush water or a relatively low volume of flush water.
- a relatively low volume of flush water may be substantially supplied from the upper portion and the relatively high volume of flush water may be supplied from a combination of the upper and lower portions.
- the relatively high volume of flush water is approximately 6 litres and/or the relatively low volume of flush water is approximately 4 litres.
- the valve of the cistern assembly may be a non syphonic valve, such as a drop valve or a flap valve.
- the assembly may be arranged to be mounted at a low level relative to an associated toilet bowl.
- the assembly may be concealed within ducting, frames or behind false walls or may be suitable for being built into furniture.
- the assembly may be capable of being built into furniture having a substantially planar surface of substantially the same height as an upper edge of a sink unit of normal height.
- the invention comprises a kit of parts having a cistern assembly, according to the invention as described above, and a flush pipe (32), the flush pipe having an arm of 500mm length or less.
- the invention comprises a toilet assembly having a cistern or a cistern assembly, according to the invention as described above, a toilet bowl having an inlet, and a flush pipe (32) in which the height h 1 between the bottom of the cistern and the toilet bowl inlet is less than 500mm preferably less than 250mm and preferably less than 150mm.
- the invention comprises a toilet assembly having a cistern assembly or a cistern, according to the invention as described above, in which the top of the cistern is positioned less than 1.1 metres above floor level.
- the cistern when the cistern is filled to its normal level so as to contain a predetermined amount of water (say 6 litres) then a proportion of this water is held at a higher level (and hence has a higher water head) than when the same amount of water is held in a comparable cistern having said relatively large cross sectional area throughout its height.
- a toilet 40 comprises a known toilet bowl 30, a cistern assembly 10 of the present invention and a flush pipe 32 interconnecting the assembly 10 and the bowl 30.
- Flush pipe 32 has a horizontal arm 32A and a vertical arm 32B.
- the cistern assembly comprises a cistern 12 and valve 14, in this case of the non-syphonic type as described in greater detail below.
- the height h 1 between the bottom 23 of the cistern 12 and the location at which pipe 32 enters bowl 30 is relatively small typically 100mm or 150mm.
- one leg of the flush pipe might be 500mm tall allowing for a distance h 1 of 500mm.
- typically the flush pipe will be cut back by the plumber to a length suitable for the particular application.
- the cistern In operation, the cistern is filled with water 15 to a level 20.
- the height of pipe 32 is determined by the ergonomics of the bowl 30.
- the height of the bottom 23 of the cistern 12 is preferably as high as possible, since this allows the inlet pipe to have a smooth bend which therefore reduces pressure losses as flush water travels around the bend.
- the height of the top of the cistern is determined by the shelf level of the bathroom furniture, which in turn is typically at the level of an adjacent sink unit.
- FIG. 2 in which the cistern assembly 10 is illustrated in greater detail, it can be seen that the cistern 12 is in this embodiment additionally fitted with an overflow pipe 16 (integral with the valve) and a float 24 connected to water inlet valve 22 (supplied by an inlet pipe 21) to enable the cistern to be refilled with water to level 20 once the toilet has been flushed.
- an overflow pipe 16 integrated with the valve
- a float 24 connected to water inlet valve 22 (supplied by an inlet pipe 21) to enable the cistern to be refilled with water to level 20 once the toilet has been flushed.
- the outlet valve 14 in this embodiment is of a known "drop valve" type comprising a hole (not shown) at the lower end thereof normally sealed by a resilient seal (not shown), the seal being connected to a mechanism (only part of which is shown) that enables a user to press a button or lever (not shown) to cause the seal to be lifted and the water 15 to pass through the hole and into the toilet bowl 30 so that flushing occurs.
- the valve 14 is a dual flush valve which in one mode of operation permits a relatively large amount of water (e.g. six litres) to be used for the flush and in a second mode uses a relatively smaller amount of water (e.g. four litres).
- Various mechanisms are known for achieving a dual flush, examples being two mechanisms having separate buttons for each flush mode, mechanisms enabling a lever or button to be pressed for a longer period for a high volume flush and a shorter period for a low volume flush and conversely a short press for a high volume flush and a longer press for a low volume flush.
- a two-button type dual flush valve 14 is used.
- the cistern 12 may broadly be separated into a top portion 34 (in this case 141mm in height) an upper portion 35 (in this case 99mm) and a lower portion 36 (in this case 105mm in height).
- the upper portion 35 has a relatively large cross-sectional area in the plane of the water surface 20 and the lower portion 36 has a relatively low cross-sectional area by comparison.
- the upper portion preferably holds approximately four litres up to the surface of the water 20 when filled (as shown) whereas the lower portion 36 holds approximately two litres of water.
- both the upper and lower portions have a substantially rectangular cross-section in the plane of the water surface 20, thus optimising the volume of water that may be contained within the cistern 12 given the limitation on its external dimensions.
- Both the upper and lower portions have a substantially uniform rectangular cross section thereby defining a step 50. In this case there are two steps, one on either side of the cistern when viewing figure 2.
- FIG. 3 shows that the back wall 52 is substantially flat. Furthermore, the front wall 53 is also substantially flat where it defines the upper and lower regions. In this case the front and back walls are spaced apart approximately slightly less than 113mm, though in further embodiments they could be spaced apart 150mm or 120mm.
- FIG. 2 shows that the lower portion 36 is defined by a first (left) lower side wall 54 and a second (right) lower side wall 55.
- the upper region 35 is defined by a first (left) upper side wall 56 and a second (right) upper side wall 57.
- one step 50 is defined by side walls 54 and 56 and a second step 50 is defined by side walls 55 and 57.
- the steps are symmetrical, though in further embodiments this need not be the case.
- one side wall could be flat with the step being defined in the other side wall alone.
- Top portion 34 is also defined by the front wall and back wall, being spaced apart in this region substantially at the same distance as the front and back walls are spaced apart at the lower and upper regions.
- the top portion 34 has side walls 58 and 59 which are spaced apart less than the first and second upper side walls 55 and 56. As such the cross section area of the top portion is less than the cross section area of the upper portion.
- Top portion includes fixing features, for example a hole for fixing pipe 21. Further holes would be provided to secure the cistern to the wall and also to secure the lid of the cistern. By providing a narrow top portion, any fixings can be kept within the 420 width as defined by the upper side walls.
- modem outlet valves are arranged to be placed in the tank as secured thereto be fixing up the bottom.
- the operating mechanism of the valve is provided above the base of the cistern. This allows for a single assembly process of the valve into the cistern.
- valve 14 In use, if a user selects the high volume flush, the valve 14 will open for a sufficient period to allow substantially all of the water 15 to be emptied from the cistern 12 meaning that the water drops a height h 2 . If however the user selects a lower volume flush, the water drops through a height h 3 to level 21.
- the greater cross-sectional area of the upper portion 34 means that a relatively large head of water (initially h 1 + h 2 ) is maintained for the first four litres of water being flushed.
- the relatively large cross-sectional area results in a relatively low rate at which the head drops. This means that the water is provided with sufficient kinetic energy for a sufficient period of time to clear waste matter (not shown) from the toilet bowl.
- the remaining two litres i.e. approximately one third of the total flush volume
- the entire four litres of flushing water is provided by the upper portion 34 and therefore has a relatively large head.
- a cistern assembly of the present invention provides a sufficient head for an effective flush action, whilst saving on the materials required to manufacture the cistern by virtue of the lower portion 36 having a smaller cross-sectional area. Nevertheless, the lower portion still contributes to the head of water being supplied.
- the cistern 12 of the present invention due to its compact size (typically 420mm wide, 345mm high and 113mm deep) is suitable for concealed installation either behind false walls and the like or within furniture.
- the upper surface of the cistern may have a height above the floor when installed of slightly less than 800mm and as such is lower than the top of a sink/basin unit when installed at a normal height.
- the cistern may be fitted within furniture having an upper surface that is approximately level with the tops of sinks/basins.
- the assembly 10 could operate with other known valves.
- the assembly 10 could operate with known "flap valves", wherein a hinged resilient flap is used to seal the outlet.
- the flap is lifted by a chain or the like attached to a flush handle, and the flap remains in a lifted position (by virtue of a float) until such time as the cistern is emptied and the flap recloses. Subsequent filling of the cistern causes water pressure on the top of the flap to ensure the flap remains shut, in spite of the float.
- different flush volumes can be provided, by providing differing dimensions to the cistern.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sanitary Device For Flush Toilet (AREA)
- Toilet Supplies (AREA)
- Non-Flushing Toilets (AREA)
- Detergent Compositions (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
Description
Claims (14)
- A cistern for a toilet, for use with a dual flush valve enabling a user to select a relatively high volume of flush water or a relatively low volume of flush water; the cistern comprising a lower portion having a relatively small cross section area and an upper portion having a relatively large cross section area wherein in use said relatively low volume of flush water is substantially equal to the volume of the upper portion and said relatively high volume of flush water is supplied from a combination of the upper and lower portions.
- A cistern as defined in claim 1 wherein said cross section areas are substantially constant for each portion, thereby defining a step between the upper and lower portions.
- A cistern as defined in any preceding claim wherein the lower and/or upper portion has a non circular cross section
- A cistern as defined in any preceding claim in which the upper and lower portions are defined by substantially flat back and substantially flat front walls in a spaced apart relationship.
- A cistern as defined in any one of claims 2 to 4 in which the upper and lower portions are defined by a first and second lower side wall and a first and second upper side wall, a step being defined between one of the first lower and first upper side walls, and/or between the second lower and second upper side walls.
- A cistern as defined in claim 5 in which the step is defined between the first lower and first upper side wall and being further defined between the second lower and second upper side walls.
- A cistern as defined in any preceding claim having a top portion having a cross section area smaller than that of the upper potion.
- A cistern assembly including a cistern as defined in any preceding claim and an outlet valve secured to a base of the cistern, the valve having an operating mechanism, said operating mechanism being provided above the base of the cistern.
- A cistern assembly as defined in claim 8 when the valve is of the dual flush type, enabling a user to select a relatively high volume of flush water or a relatively low volume of flush water.
- A cistern assembly as defined in any one of claims 8 or 9 in which the valve is a non syphonic valve, such as a drop valve or a flap valve.
- A kit of parts comprising a cistern assembly as defined in any preceding claim and a flush pipe (32), the flush pipe having an arm of 500mm length or less.
- A toilet assembly comprising a cistern or a cistern assembly as defined in any preceding claim, a toilet bowl having an inlet, and a flush pipe (32) in which the height h1 between the bottom of the cistern and the toilet bowl inlet is less than 500mm preferably less than 250mm and preferably less than 150mm.
- A toilet assembly comprising a cistern assembly as defined in any one of claims 8-10 or a cistern as defined in any one of claims 1 to 7 in which the top of the cistern is positioned less than 1.1 metres above floor level.
- A bathroom suite comprising a toilet assembly as defined in claims 13 or 14 and a sink wherein the top of the cistern is lower than upper edge of sink.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0121322.2A GB0121322D0 (en) | 2001-09-03 | 2001-09-03 | Cistern assembly and a cistern |
GB0121322 | 2001-09-03 | ||
PCT/GB2002/004026 WO2003021051A1 (en) | 2001-09-03 | 2002-09-03 | Cistern assembly and a cistern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1423573A1 EP1423573A1 (en) | 2004-06-02 |
EP1423573B1 true EP1423573B1 (en) | 2005-12-07 |
Family
ID=9921437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02765011A Expired - Lifetime EP1423573B1 (en) | 2001-09-03 | 2002-09-03 | Cistern assembly and a cistern |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1423573B1 (en) |
AT (1) | ATE312244T1 (en) |
DE (1) | DE60207871T2 (en) |
ES (1) | ES2254729T3 (en) |
GB (1) | GB0121322D0 (en) |
WO (1) | WO2003021051A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201416802D0 (en) * | 2014-09-12 | 2014-11-05 | Dudley Thomas Ltd | Syphon assembly and actuator therefor |
DE202016000056U1 (en) | 2016-01-07 | 2017-04-10 | Viega Technology Gmbh & Co. Kg | Valve fitting for filling a sanitary cistern and sanitary cistern with such a valve fitting |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB523298A (en) * | 1938-12-02 | 1940-07-11 | Percy Geikie Donald | Improvements relating to flushing cisterns |
AU673394B2 (en) * | 1993-02-05 | 1996-11-07 | Caroma Industries Limited | A cistern |
AU673292B2 (en) * | 1993-11-10 | 1996-10-31 | Caroma Industries Limited | A cistern |
-
2001
- 2001-09-03 GB GBGB0121322.2A patent/GB0121322D0/en not_active Ceased
-
2002
- 2002-09-03 ES ES02765011T patent/ES2254729T3/en not_active Expired - Lifetime
- 2002-09-03 AT AT02765011T patent/ATE312244T1/en not_active IP Right Cessation
- 2002-09-03 DE DE60207871T patent/DE60207871T2/en not_active Expired - Lifetime
- 2002-09-03 EP EP02765011A patent/EP1423573B1/en not_active Expired - Lifetime
- 2002-09-03 WO PCT/GB2002/004026 patent/WO2003021051A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
WO2003021051A1 (en) | 2003-03-13 |
DE60207871T2 (en) | 2006-07-06 |
ATE312244T1 (en) | 2005-12-15 |
EP1423573A1 (en) | 2004-06-02 |
DE60207871D1 (en) | 2006-01-12 |
GB0121322D0 (en) | 2001-10-24 |
ES2254729T3 (en) | 2006-06-16 |
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