EP1491691A2 - Pneumatic device for activating a flush tank drain valve assembly - Google Patents
Pneumatic device for activating a flush tank drain valve assembly Download PDFInfo
- Publication number
- EP1491691A2 EP1491691A2 EP20040102960 EP04102960A EP1491691A2 EP 1491691 A2 EP1491691 A2 EP 1491691A2 EP 20040102960 EP20040102960 EP 20040102960 EP 04102960 A EP04102960 A EP 04102960A EP 1491691 A2 EP1491691 A2 EP 1491691A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bellows
- pipe
- actuator assembly
- pneumatic actuator
- shutter
- 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.)
- Withdrawn
Links
- 230000003213 activating effect Effects 0.000 title claims abstract description 8
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000012528 membrane Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
Images
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
- E03D1/02—High-level flushing systems
- E03D1/14—Cisterns discharging variable quantities of water also cisterns with bell siphons in combination with flushing valves
- E03D1/142—Cisterns discharging variable quantities of water also cisterns with bell siphons in combination with flushing valves in cisterns with flushing valves
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/02—Special constructions of flushing devices, e.g. closed flushing system operated mechanically or hydraulically (or pneumatically) also details such as push buttons, levers and pull-card therefor
- E03D5/024—Operated hydraulically or pneumatically
Definitions
- the present invention relates to a pneumatic device for activating a flush tank drain valve assembly.
- a flush tank valve assembly comprises a valve body; and a shutter movable between an open position and a closed position with respect to the valve body, and which is raised to drain the water from the tank.
- the valve assembly shutter is known to be raised using a pneumatic device, known types of which normally comprise a button which activates a piston to feed air to a pneumatic actuator to raise the shutter and so drain the water from the tank.
- flush tanks are commonly equipped with dual controls, i.e. two separate buttons for full and partial drainage of the tank.
- Dual controls pose complications which, on the one hand, increase cost and, on the other, impair the reliability of the flush tank.
- a pneumatic device for activating a flush tank drain valve assembly as claimed in Claim 1.
- Number 1 in Figure 1 indicates as a whole a flush tank comprising a vessel C, a valve assembly 2, and a pneumatic device 3 for activating valve assembly 2. Only part of vessel C of tank 1 is shown in Figure 1, which shows a bottom wall 4 supporting valve assembly 2; and a rib 5 supporting pneumatic device 3.
- Valve assembly 2 extends along a vertical axis A, and comprises a tubular structure 6 secured to wall 4 of vessel C; a cup 7 sliding inside tubular structure 6; and an overflow pipe 8 in turn sliding inside cup 7.
- Tubular structure 6 comprises a valve body 9 which cooperates with a shutter 10 located at the bottom end of overflow pipe 8.
- Device 3 provides for raising pipe 8 and shutter 10 to drain the water from vessel C through valve body 9, and comprises a member 11 connected to the top end of overflow pipe 8; and a member 12 fitted to rib 5 and connected rigidly through vessel C to valve body 9. Members 11 and 12 are connected to each other in sliding manner by an appendix 13 which is parallel to axis A, is integral with member 11, and engages a hole 14 in member 12.
- Device 3 comprises a pneumatic actuator assembly 15 housed inside two seats associated respectively with members 11 and 12, and for raising member 11 with respect to member 12, and shutter 10 with respect to valve body 9; and two pipes 16 and 17 connected to pneumatic actuator assembly 15. Each of pipes 16 and 17 supplies air to, and allows air to flow back from, pneumatic actuator assembly 15.
- pneumatic actuator assembly 15 assumes a compressed position ( Figures 1, 2, 4 and 7), and is extensible in direction D depending on the air supplied to pneumatic actuator assembly 15 along pipe 16 or pipe 17 ( Figures 5, 6, 9 and 10).
- assembly 15 comprises two bellows 18 and 19 housed inside the seat of member 11 and the seat of member 12 respectively.
- Each bellows 18, 19 is made of elastic material and defined by an expandable chamber defined by two mutually connected membranes 20 and 21.
- Membrane 20 comprises a central disk 22, from which a fitting projects, and in which an air hole 23 is formed (for the sake of clarity, the holes in bellows 18 and 19 are indicated 23a and 23b respectively); an outer edge 24 having a seat 25 engaged by membrane 21; and an annular portion 26 which is undulated in the rest position, connects disk 22 to edge 24, and is thinner than disk 22 and edge 24.
- Portion 26 has an annular appendix 27 which extends inside the chamber, opposite disk 22, to form an annular seat 28 between appendix 27 and disk 22.
- Membrane 21 comprises a flat central disk 29 with no hole; an outer annular lip 30 engaging seat 25; and an annular portion 31 which is undulated in the rest position, connects disk 29 to lip 30, and is the same thickness as portion 26.
- Bellows 18 is fitted to member 11 by inserting the fitting inside a tube 32, which is integral with member 11 and connects the bellows to pipe 16.
- bellows 19 is connected to member 12 in exactly the same way, by inserting the respective fitting inside a tube 33 integral with member 12. Pipe 16 therefore communicates with the chamber of bellows 18 via hole 23a, and pipe 17 communicates with the chamber of bellows 19 via hole 23b.
- Bellows 18 and 19 are substantially identical, are positioned opposite each other with respective central disks 29 facing and contacting each other, and differ solely by the chamber of bellows 19 housing a member 34 for delaying outflow of the air from bellows 19.
- member 34 is in the form of a disk with a jagged edge, and is elastically deformable. That is, member 34 has a central body 35, from which project radial lobes 36 equally spaced about central body 35 and alternating with gaps 37.
- Member 34 is housed in seat 28 opposite hole 23b. That is, the ends of lobes 36 occupy seat 28 to permit airflow through a passage between disk 22 and central body 35, and through gaps 37.
- Figures 4, 5 and 6 show operation of pneumatic device 3.
- device 3 is in the rest position, bellows 18 and 19 are both in the compressed position, and shutter 10 is down.
- Figure 5 shows the operating position assumed by device 3 when the partial-drainage control button (not shown) is pressed : bellows 19 is in the compressed position, while bellows 18 is in the extended position, as a result of feeding air into bellows 18, thus raising member 11 and shutter 10 (not shown in Figure 5).
- member 11 is raised, the air in bellows 18 is expelled along pipe 16, and member 11 is restored to the Figure 4 rest position, thus lowering shutter 10.
- Figure 6 shows what happens when the full-drainage control button (not shown) is pressed : bellows 18 is in the compressed position, and air is fed into bellows 19 along pipe 17, and deforms member 34 so as to flow easily through hole 23b and gaps 37. Extension of bellows 19 produces the same travel of member 11 as that produced by extension of bellows 18. When air is expelled from bellows 19, deformation of member 34 is prevented by disk 22, and air leaks slowly through gaps 37 and an annular passage formed by body 35 and disk 22, so that downward travel of member 11 is slower than that produced by compression of bellows 18.
- valve assembly 2 Between air being fed into and expelled from bellows 18 along pipe 16, valve assembly 2 remains open for a relatively short period sufficient to partly drain tank 1, whereas activation of bellows 19 by the airflow along pipe 17, given the slowness with which bellows 19 returns to the rest position, keeps the valve assembly open for a relatively long period enabling full drainage of tank 1.
- pneumatic actuator assembly 15 comprises a single bellows 38 comprising parts similar to those described with reference to bellows 19 in Figure 2, and which are indicated using the same reference numbers as for bellows 19.
- Bellows 38 comprises a membrane 20 identical with membrane 20 of bellows 19; and a membrane 21 which differs from membrane 21 of bellows 19 by comprising a hole 39 formed in central disk 29 of membrane 21, and a relative fitting.
- Delay member 34 is housed in seat 28 of membrane 20, opposite hole 23b, and operates in the same way as described with reference to the Figure 2 embodiment.
- Figure 7 Operation of the Figure 7 embodiment is shown in Figures 8, 9 and 10.
- bellows 38 is in the rest position; in Figure 9, bellows 38 is in the extended position, as a result of feeding in air along pipe 16, and so returns rapidly to the rest position to partly drain tank 1; and, in Figure 10, bellows 38 is in the extended position, as a result of feeding in air along pipe 17, and so returns slowly to the rest position to drain tank 1 completely.
- Pneumatic device 3 is extremely straightforward in both embodiments.
- the Figure 2 embodiment employs two separate bellows 18 and 19, but which are identical in design and can therefore be produced using the same molds.
- the only difference between bellows 18 and 19 lies in member 34, which is fitted inside bellows 19.
- neither embodiment comprises complex mechanisms, thus enabling considerable saving in terms of component parts in the manufacture of tank 1.
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Driven Valves (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
Abstract
Description
- The present invention relates to a pneumatic device for activating a flush tank drain valve assembly.
- A flush tank valve assembly comprises a valve body; and a shutter movable between an open position and a closed position with respect to the valve body, and which is raised to drain the water from the tank. In top-range flush tanks, the valve assembly shutter is known to be raised using a pneumatic device, known types of which normally comprise a button which activates a piston to feed air to a pneumatic actuator to raise the shutter and so drain the water from the tank.
- To save water, flush tanks are commonly equipped with dual controls, i.e. two separate buttons for full and partial drainage of the tank. Dual controls, however, pose complications which, on the one hand, increase cost and, on the other, impair the reliability of the flush tank.
- It is an object of the present invention to provide a pneumatic device for activating a flush tank drain valve assembly, and which provides in a straightforward, low-cost manner for selective full and partial drainage of the flush tank.
- According to the present invention, there is provided a pneumatic device for activating a flush tank drain valve assembly, as claimed in
Claim 1. - A number of preferred, non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a partly sectioned front view, with parts removed for clarity, of a pneumatic device for activating a flush tank drain valve assembly;
- Figure 2 shows a larger-scale, partly sectioned front view of a detail of the pneumatic device in Figure 1;
- Figure 3 shows a plan view of a component part of the Figure 1 pneumatic device;
- Figures 4, 5 and 6 show schematic views of the Figure 1 pneumatic device in three different operating positions;
- Figure 7 shows a partly sectioned front view of a variation of the Figure 2 pneumatic device;
- Figures 8, 9 and 10 show schematic views of the Figure 7 device in three different operating positions.
-
Number 1 in Figure 1 indicates as a whole a flush tank comprising a vessel C, avalve assembly 2, and apneumatic device 3 for activatingvalve assembly 2. Only part of vessel C oftank 1 is shown in Figure 1, which shows abottom wall 4 supportingvalve assembly 2; and arib 5 supportingpneumatic device 3.Valve assembly 2 extends along a vertical axis A, and comprises atubular structure 6 secured towall 4 of vessel C; acup 7 sliding insidetubular structure 6; and anoverflow pipe 8 in turn sliding insidecup 7.Tubular structure 6 comprises avalve body 9 which cooperates with ashutter 10 located at the bottom end ofoverflow pipe 8. -
Device 3 provides for raisingpipe 8 andshutter 10 to drain the water from vessel C throughvalve body 9, and comprises amember 11 connected to the top end ofoverflow pipe 8; and amember 12 fitted torib 5 and connected rigidly through vessel C tovalve body 9.Members appendix 13 which is parallel to axis A, is integral withmember 11, and engages ahole 14 inmember 12.Device 3 comprises apneumatic actuator assembly 15 housed inside two seats associated respectively withmembers member 11 with respect tomember 12, andshutter 10 with respect tovalve body 9; and twopipes pneumatic actuator assembly 15. Each ofpipes pneumatic actuator assembly 15. The air flowing alongpipes tank 1. When no air is supplied,pneumatic actuator assembly 15 assumes a compressed position (Figures 1, 2, 4 and 7), and is extensible in direction D depending on the air supplied topneumatic actuator assembly 15 alongpipe 16 or pipe 17 (Figures 5, 6, 9 and 10). - With reference to Figure 2,
assembly 15 comprises twobellows member 11 and the seat ofmember 12 respectively. Eachbellows membranes Membrane 20 comprises acentral disk 22, from which a fitting projects, and in which anair hole 23 is formed (for the sake of clarity, the holes inbellows outer edge 24 having aseat 25 engaged bymembrane 21; and anannular portion 26 which is undulated in the rest position, connectsdisk 22 toedge 24, and is thinner thandisk 22 andedge 24.Portion 26 has anannular appendix 27 which extends inside the chamber, oppositedisk 22, to form anannular seat 28 betweenappendix 27 anddisk 22. -
Membrane 21 comprises a flatcentral disk 29 with no hole; an outerannular lip 30engaging seat 25; and anannular portion 31 which is undulated in the rest position, connectsdisk 29 tolip 30, and is the same thickness asportion 26. Bellows 18 is fitted tomember 11 by inserting the fitting inside atube 32, which is integral withmember 11 and connects the bellows to pipe 16. Andbellows 19 is connected tomember 12 in exactly the same way, by inserting the respective fitting inside atube 33 integral withmember 12. Pipe 16 therefore communicates with the chamber ofbellows 18 viahole 23a, andpipe 17 communicates with the chamber ofbellows 19 viahole 23b. Bellows 18 and 19 are substantially identical, are positioned opposite each other with respectivecentral disks 29 facing and contacting each other, and differ solely by the chamber ofbellows 19 housing amember 34 for delaying outflow of the air frombellows 19. As shown more clearly in Figure 3,member 34 is in the form of a disk with a jagged edge, and is elastically deformable. That is,member 34 has acentral body 35, from which projectradial lobes 36 equally spaced aboutcentral body 35 and alternating withgaps 37.Member 34 is housed inseat 28opposite hole 23b. That is, the ends oflobes 36 occupyseat 28 to permit airflow through a passage betweendisk 22 andcentral body 35, and throughgaps 37. - Figures 4, 5 and 6 show operation of
pneumatic device 3. In Figure 4,device 3 is in the rest position,bellows shutter 10 is down. Figure 5 shows the operating position assumed bydevice 3 when the partial-drainage control button (not shown) is pressed :bellows 19 is in the compressed position, whilebellows 18 is in the extended position, as a result of feeding air intobellows 18, thus raisingmember 11 and shutter 10 (not shown in Figure 5). Oncemember 11 is raised, the air inbellows 18 is expelled alongpipe 16, andmember 11 is restored to the Figure 4 rest position, thus loweringshutter 10. - Figure 6 shows what happens when the full-drainage control button (not shown) is pressed :
bellows 18 is in the compressed position, and air is fed intobellows 19 alongpipe 17, anddeforms member 34 so as to flow easily throughhole 23b andgaps 37. Extension ofbellows 19 produces the same travel ofmember 11 as that produced by extension ofbellows 18. When air is expelled frombellows 19, deformation ofmember 34 is prevented bydisk 22, and air leaks slowly throughgaps 37 and an annular passage formed bybody 35 anddisk 22, so that downward travel ofmember 11 is slower than that produced by compression ofbellows 18. Between air being fed into and expelled frombellows 18 alongpipe 16,valve assembly 2 remains open for a relatively short period sufficient to partly draintank 1, whereas activation ofbellows 19 by the airflow alongpipe 17, given the slowness with whichbellows 19 returns to the rest position, keeps the valve assembly open for a relatively long period enabling full drainage oftank 1. - In a second embodiment of the invention (Figure 7),
pneumatic actuator assembly 15 comprises asingle bellows 38 comprising parts similar to those described with reference tobellows 19 in Figure 2, and which are indicated using the same reference numbers as forbellows 19.Bellows 38 comprises amembrane 20 identical withmembrane 20 ofbellows 19; and amembrane 21 which differs frommembrane 21 ofbellows 19 by comprising ahole 39 formed incentral disk 29 ofmembrane 21, and a relative fitting. Delaymember 34 is housed inseat 28 ofmembrane 20,opposite hole 23b, and operates in the same way as described with reference to the Figure 2 embodiment. - Operation of the Figure 7 embodiment is shown in Figures 8, 9 and 10. In Figure 8,
bellows 38 is in the rest position; in Figure 9,bellows 38 is in the extended position, as a result of feeding in air alongpipe 16, and so returns rapidly to the rest position to partly draintank 1; and, in Figure 10,bellows 38 is in the extended position, as a result of feeding in air alongpipe 17, and so returns slowly to the rest position to draintank 1 completely. - In connection with the second embodiment, it should be pointed out that the known pistons (not shown) for supplying air to
bellows 38 do not communicate with the outside, at least in the rest position, so that the air fed alongpipe 16 necessarily flows back alongpipe 16, and the air fed alongpipe 17 necessarily flows back alongpipe 17. -
Pneumatic device 3 is extremely straightforward in both embodiments. The Figure 2 embodiment employs twoseparate bellows member 34, which is fitted insidebellows 19. - The Figure 7 embodiment is even more straightforward by comprising a
single bellows 38. - Moreover, neither embodiment comprises complex mechanisms, thus enabling considerable saving in terms of component parts in the manufacture of
tank 1.
Claims (10)
- A pneumatic device for activating a valve assembly (2) of a flush tank (1), wherein the valve assembly (2) comprises a valve body (9), and a shutter (10) movable, in a given direction (D) and with respect to the valve body, between an open position and a closed position; the pneumatic device (3) comprising an extensible pneumatic actuator assembly (15) for raising the shutter (10) from the closed position to the open position when air is fed into the pneumatic actuator assembly (15); and a first pipe (16) along which air is fed to and flows back from said pneumatic actuator assembly (15); and the pneumatic device being characterized by comprising a second pipe (17) along which air is fed to and flows back from said pneumatic actuator assembly (15); and delaying means (34) for delaying backflow of the air along the second pipe (17).
- A device as claimed in Claim 1, characterized by comprising a first member (11) integral with the shutter (10), and a second member (12) integral with the valve body (9); said pneumatic actuator assembly (15) being located between the first and second member (11, 12) and connected to the first and second member (11, 12).
- A device as claimed in Claim 2, characterized in that said first and said second member (11, 12) are connected to each other to slide in said direction (D).
- A device as claimed in any one of the foregoing Claims, characterized in that said pneumatic actuator assembly (15) comprises a first hole (23a; 39) to which said first pipe (16) is connected, and a second hole (23b; 23b) to which said second pipe (17) is connected; said delaying means (34) being located at the second hole (23b; 23b).
- A device as claimed in Claim 4, characterized in that said delaying means (34) are in the form of a disk made of elastic material and having airflow gaps (37).
- A device as claimed in Claim 5, characterized in that said pneumatic actuator assembly (15) comprises a seat (28) for housing said delaying means (34); said seat (28) extending about said second hole (23b).
- A device as claimed in Claim 6, characterized in that said seat (28) is annular; said delaying means (34) comprising a central body (35) having radial lobes (36) alternating with gaps (37); the free ends of said lobes (36) engaging said seat (28).
- A device as claimed in any one of the foregoing Claims, characterized in that said pneumatic actuator assembly (15) comprises a first and a second bellows (18, 19) arranged in series; the first bellows (18) being fed by the first pipe (16), and the second bellows (19) being fed by the second pipe (17).
- A device as claimed in Claim 8, characterized in that the first bellows (18) produces a given first travel of the shutter (10), and the second bellows (19) produces a given second travel of the shutter (10); the first and second travel being substantially equal.
- A device as claimed in any one of Claims 1 to 7, characterized in that said pneumatic actuator assembly (15) comprises a single third bellows (38); said third bellows (38) being fed selectively by the first and second pipe (16, 17).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001325A ITMI20031325A1 (en) | 2003-06-27 | 2003-06-27 | PNEUMATIC DEVICE TO OPERATE THE DISCHARGE VALVE ASSEMBLY OF A RINSE BOX. |
ITMI20031325 | 2003-06-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1491691A2 true EP1491691A2 (en) | 2004-12-29 |
EP1491691A3 EP1491691A3 (en) | 2005-07-20 |
Family
ID=30131321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04102960A Withdrawn EP1491691A3 (en) | 2003-06-27 | 2004-06-25 | Pneumatic device for activating a flush tank drain valve assembly |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1491691A3 (en) |
IT (1) | ITMI20031325A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3729569A1 (en) * | 1987-09-04 | 1989-03-16 | Schwab Sanitaer Plastic Gmbh | Flushing cistern |
EP0761893A1 (en) * | 1995-08-04 | 1997-03-12 | Plastic Investment Holding S.A. | Pneumatic device for activating the discharge valve of a lavatory flush tank |
EP0890680A1 (en) * | 1997-07-07 | 1999-01-13 | Geberit Technik Ag | Activating device for the outlet-valve of a flushing cistern |
-
2003
- 2003-06-27 IT IT001325A patent/ITMI20031325A1/en unknown
-
2004
- 2004-06-25 EP EP04102960A patent/EP1491691A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3729569A1 (en) * | 1987-09-04 | 1989-03-16 | Schwab Sanitaer Plastic Gmbh | Flushing cistern |
EP0761893A1 (en) * | 1995-08-04 | 1997-03-12 | Plastic Investment Holding S.A. | Pneumatic device for activating the discharge valve of a lavatory flush tank |
EP0890680A1 (en) * | 1997-07-07 | 1999-01-13 | Geberit Technik Ag | Activating device for the outlet-valve of a flushing cistern |
Also Published As
Publication number | Publication date |
---|---|
EP1491691A3 (en) | 2005-07-20 |
ITMI20031325A0 (en) | 2003-06-27 |
ITMI20031325A1 (en) | 2004-12-28 |
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