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
  • E03D1/06—Cisterns with tube siphons
  • E03D1/12—Siphon action initiated by outlet of air
• • 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
  • E03D1/06—Cisterns with tube siphons
  • E03D1/12—Siphon action initiated by outlet of air
  • E03D1/125—Siphon action initiated by outlet of air in cisterns with tube siphons

Definitions

• the present invention relates to water closets and in particular to a new and improved flushing system which permits essentially reducing the force required for ini ⁇ tiating a flushing operation by using a siphon-based flushing system.
• the invention also relates to an actuat ⁇ ing mechanism which is especially well suited for use in such a new and improved flushing system.
• GB-A-2,205, 595 discloses a flushing system for water closets which has a double siphon immersed in a flush cistern.
• This siphon has an almost sinuous conduit with four juxtaposed vertical conduit legs and U-bends successive ⁇ sively interconnecting the conduit legs.
• the central bend is facing downwards and interconnects the lower ends of the two central conduit legs, while the two outer U-bends are facing upwards and connect the upper ends of the cen ⁇ tral conduit legs to the upper ends of the outer conduit legs.
• This approximately sinusoidally-bent conduit is arranged in a flush cistern and is completely immersed in the water when the flush cistern is filled therewith.
• the first vertical conduit leg acts as the suction pipe of the siphon
• the last vertical conduit leg acts as the outlet pipe of the siphon and is connected to a flushing ramp at the upper end of the water closet.
• From the upper end of the upwardly-facing first U-bend further extends a downwardly-directed U-bent venting tube which at the upper end of its other U-leg is connected to the upward ⁇ ly-facing third U-bend a certain distance below the crest of this U-bend.
• This venting tube shaped as a U-bend, acts as a water trap in the starting position of the flushing system when the cistern is filled.
• the water in the water trap is removed by means of an air ball which is connected to the lower U-web of the U-bent venting tube and which, upon compression and, hence, increase of the air pressure in the system, displaces the water in the water trap and evacuates it into the outlet pipe of the siphon.
• the system also includes a further U-bent conduit which is connected to the crest of the third U-bent conduit of the double siphon and extends up over the maximum water level in the flush cistern and opens on a level with the intended minimum water level in the flush cistern.
• Danish Patent Specification DK-B-57,606 describes a flush cistern which also uses a type of double siphon.
• a flushing mechanism which has a water trap.
• an actuator piston which, when lifted, will lower the water level in the water trap and, hence, also reduce the pres- sure of the water column.
• the liquid in the water trap will no longer be able to withstand the pres ⁇ sure from the air entrapped in the double siphon and the water-trap function will thus cease, so that the air in the first upwardly-facing U-bend of the double siphon is emitted into the atmosphere and the siphon function is initiated.
• the actuator mechanism is disposed in an upwardly-oriented compartment at the inlet end of this U-bend.
• This mechanism has however not proved completely satisfactory in operation, and difficulties have often been met with in establishing and maintaining the siphon function. This is probably due to the fact that air can enter the mechanism between the actuating piston and the wall of the water-trap leg where the piston is disposed. As a result, there is a risk of air leakage into the siphon, impairing or interrupting the siphon effect.
• the placement of the actuator mechanism above the inlet leg of the double siphon entails certain drawbacks, in that the leaving air must flow countercurrently to the incoming flush water from the flush cistern. This also makes it more difficult to completely remove the air in the first upwardly-facing U-bend of the double siphon. In fact, remaining air is most detrimental to the per ⁇ formance of the siphon.
• An object of the present invention is to provide an improvement of the flushing systems and actuating mecha- nisms described in GB-A-2,205, 595 and DK-B-57,606. This and other objects of the invention are achieved by means of a flushing system and an actuating mechanism having the features stated in claims 1 and 6, respectively.
• the subclaims define especially advantageous embodiments of the invention.
• the invention sets out from a flushing system according to GB-A-2,205,595, i.e. a flushing system hav ⁇ ing a double siphon arranged in a flush cistern and being in the form of a substantially sinusoidally-bent conduit with four substantially vertical juxtaposed conduit legs and U-bends successively interconnecting the conduit legs, the central U-bend facing downwards and intercon ⁇ necting the lower ends of the two central conduit legs, while the two outer U-bends are facing upwards and con- nect the upper ends of the central conduit legs to the upper ends of the outer conduit legs, the substantially sinusoidally-bent conduit being arranged in a flush cis ⁇ tern so as to be completely immersed in the water when the flushing system is filled therewith, the first vertical conduit leg being intended to act as the suction pipe of the siphon and the last vertical conduit leg being intended to act as the outlet pipe of the siphon and being connected to a flushing ramp at the upper end of the bowl of the water closet.
• the invention resides in preventing the evacuation of the flush water by means of an air lock or plug which is entrapped in the double siphon and upon the evacuation of which the flushing procedure is started.
• the air lock is evacuated via a venting tube whose one end is connected to the double siphon at a point located in the U-bend containing the air lock a certain distance below the crest of the bend towards the outlet side of the U- bend. Therefore, the connecting point is located in the downstream direction of the flushing liquid, and the air can thus be removed in a more reliable manner.
• the venting tube extends up over the level of the crest of the double siphon and is connected at its other end to a piston chamber, in which a starter piston is arranged for vertical movement.
• the piston chamber and the starter piston act as part of an actuating mechanism.
• the connection of the venting tube with the piston chamber is located a certain distance over the bottom of the piston chamber so as to define a liquid sump at the lower end of the piston chamber.
• the piston chamber is filled with water when in the closed state, and when lifting the starter piston, the entrapped liquid will flow down into the liquid sump below the connection of the venting tube and the air lock is evacuated via the piston chamber.
• the actuating mechanism especially well suited for this flushing system, has a locking device to prevent renewed initiation of the flushing operation before liquid has again been filled into the flush cistern to above a certain minimum level over the venting tube.
• Figs 1-6 schematically illustrate the inventive principle and its function in the different phases of an evacuation procedure.
• Fig. 7 is a vertical section of a specific embodiment of a flushing system and an actuating mechanism according to the invention.
• Fig. 8 shows the embodiment of Fig. 7 in the state cor ⁇ responding to Fig. 3.
• Fig. 9 shows the embodiment of Fig. 7 in the state cor ⁇ responding to Fig. 5.
• Fig. 10 shows the embodiment of Fig. 7 from above.
• Fig. 11 is a section taken along line XI-XI in Fig. 7.
• Fig. 12 shows the embodiment of Fig. 7 from the left with respect to Fig. 7.
• Fig. 13 shows the embodiment of Fig. 7 from the right with respect to Fig. 7.
• Fig. 14 shows the embodiment of Fig. 7 in a side view from the front with respect to Fig. 7.
• Fig. 15 is a section taken along line XV-XV in Fig. 14.
• Fig. 16 shows parts of another embodiment of a flushing system and an actuating mechanism according to the invention, this Figure corresponding the setting position in Fig. 7.
• Fig. 17 is a view similar to Fig. 8, but shows said other embodiment of the invention.
• Fig. 18 is a view similar to Fig. 9, but shows said other embodiment of the invention.
• Figs 1-6 schematically show a flushing system and an actuating mechanism according to the present invention. In a flush cistern 10, an outlet device 11 is immersed.
• the outlet device is designed as a double siphon in the form of an approximately sinusoidally-extending conduit having four juxtaposed conduit legs 12, 13, 14, 15 and U- bends 16, 17 and 18 successively interconnecting the con ⁇ duit legs.
• the central U-bend 17 is facing downwards and interconnects the lower ends of the two central conduit legs 13, 14.
• the two outer U-bends 16, 18 are facing upwards and connect the upper ends of the two central conduit legs 13, 14 to the upper ends of the outer con ⁇ duit legs 12, 15.
• the first vertical conduit leg 12 is intended to act as the suction pipe of the siphon.
• the last vertical conduit leg 15 is intended to act as the outlet pipe of the siphon and is connected in customary manner to a flushing ramp (not shown) at the upper end of the bowl of a water closet.
• the flushing system also has a venting tube 19 serv ⁇ ing to evacuate air which, when the flush cistern 10 is filled with liquid, is entrapped in the first upwardly- facing U-bend 16 of the double siphon.
• One end of the venting tube 19 is connected to a point on the downstream side of this U-bend and extends up over the level of the crests of the upwardly-facing U-bends 16, 18 to be con- nected at its other end to an actuating mechanism 20.
• This mechanism includes a nonreturn valve 21 comprising a substantially vertical piston chamber 22, in which a starter piston 23 is provided for vertical movement.
• the upper end of the piston chamber 22 can be connected to the ambient air at a point above the maximum water level 24 in the flush cistern.
• the piston chamber further has a liquid sump 25 which is located below the opening of the venting tube 19 in the piston chamber 22.
• the liquid sump has a sufficient volume for holding liquid that remains in the starter-piston chamber 22 and the venting tube 19 when the flush cistern 10 is filled.
• the starter piston 23 and the starter-piston chamber 22 are so designed that air- and liquid-tight engagement is produced within a conically flared portion 26.
• a special seal can be used between an outwardly directed flange and an engagement surface, as will be described further on.
• This seal within the conically flared portion or a similar seal provides the desired nonreturn-valve function.
• the starter piston 23 and the piston chamber 22 are so designed that when the starter piston is lifted, air will be sucked into the starter- piston chamber 22 and, consequently, liquid present in the starter-piston chamber and the venting tube will flow down into the liquid sump 25.
• the air entrapped in the first U-bend 16 in the starting position (Fig. 1) can be evacuated via the venting tube 19 and the nonreturn valve 21.
• Figs 1-6 show the sequence of the different phases of operation.
• the starter pis ⁇ ton 23 is lifted so that air can pass from above into the starter-piston chamber 22 and so that the liquid entrap ⁇ ped therein flows down into the liquid sump 25 to expose the opening of the venting tube 19.
• the air entrapped in the U-bend 16 will be discharged by the liquid pressure through the starter-piston chamber.
• the resulting liquid surge makes the liquid fill the first U-bend 16 of the double siphon and thereafter the entire siphon as well, such that the siphon function is initiat ⁇ ed and liquid is discharged from the flush cistern.
• Fig. 3 shows the state when the first three conduit legs 12, 13, 14 are completely filled with liquid.
• a major advantage of this system is that the flush ⁇ ing operation is easily started and requires but a slight force, in that the liquid column in the piston chamber 22 over the inlet 29 of the venting tube 19 substantially outbalances the overpressure represented by the differ ⁇ ence in level between the liquid surfaces 31 and 31 ' .
• the system is advantageous in so far as the starter ball used in GB-A-2,205,595 has been dispensed with and the flushing operation can be initiated by tra ⁇ ditional measures, i.e. by either lifting a piston or by depressing a button so as to lift the piston.
• Fig. 7 shows a preferred embodiment of a flushing system and an actuating mechanism according to the pre ⁇ sent invention.
• the flush- ing system is mounted on the bottom 27 of a flush cis ⁇ tern.
• the double siphon 11 has its four conduit legs 12, 13, 14, 15 arranged substantially vertically beside each other. As appears from Fig. 11, the conduit legs have flattened cross-section to promote laminar flow. However, the cross-sectional shape need not be as flattened as shown in Fig. 11, but an oval or square cross-section can also be used.
• the flow passage of the double siphon is preferably designed with a reduced flowthrough area from the conduit leg 12 to a location in the conduit leg 15 in order to improve the flow, to increase the flow velocity and to promote the laminar flow.
• the last conduit leg or outlet pipe 15 is connected to an outlet sleeve 28, in turn connected to the conven ⁇ tional flushing ramp (not shown) of the water closet.
• the venting tube 19 is con ⁇ nected to the second conduit leg 13 at a point facing away from the first conduit leg and close to the upper end of second conduit leg 13, i.e. along the wall surface where the air flows when evacuating the entrapped air bubble.
• the reason for this placement is that the inlet 29 of the venting tube 19 should be disposed so far away in the downstream direction that the air is completely displaced by the water flowing into the conduit leg 12 upon the initiation of the flushing operation.
• the outlet end of the venting tube 19 is connected to the piston chamber 22 at a point which is preferably located slight- ly below the liquid levels 31 in the first conduit leg and the third conduit leg in the starting position of the flushing system (see Fig. 7) .
• the starter piston 23 has an outwardly-directed flange 32 which in the closed state of the nonreturn valve engages an edge 33 on the starter-piston chamber 22. If so required, the flange 32 may be provided with a seal, with which it engages the edge 33.
• the piston 23 has two floating bodies 34 for a purpose which will be described in more detail hereinafter (Fig. 11). These floating bodies are disposed on the outside of the starter-piston chamber 22 and depend below the upper edge 33 of the chamber.
• the upper face of the piston is provided with a lug 35, in which a locking latch 36 is pivotally mounted for pivotal movement between a locking position indicated by full lines and a release position indicated by dash-dot lines in Fig. 7.
• the locking surface 37 of the latch engages a stationary locking surface on a fork 38.
• this pre ⁇ ferably has a projection 39 stopping the outward pivotal movement by engaging the upper face of the piston 23.
• the float 40 of the flushing system has been designed as a downwardly open bell which is guided in a float chamber 41 for vertical movement therein.
• the chamber 41 is fixedly connected to the double siphon 11 and the piston chamber 22.
• the float chamber 41 is intended to be filled with flushing liquid, which is achieved by the liquid, when filling the flush cistern, flowing over the top edge of the float chamber and down between this and the float 40.
• a nonreturn valve 42 in the form of a pivotable valve plate mounted for pivotal movement about a pivot pin 43 adjacent the upper edge of the float chamber.
• the nonreturn valve is inclin ⁇ ed so as to be urged downwards, when in its normal posi- tion, by the force of gravity into abutment against the side of the float chamber and into sealing engagement with a valve seat 44.
• the float chamber will be successively evacuated as the liquid level in the flush cistern is sinking.
• filling of the float chamber with flushing liquid is pre ⁇ vented until the flushing liquid can flow over the top edge of the float chamber. This arrangement enables quicker filling of the flush cistern and does not involve the customary gradual decrease of the supply of liquid during the final phase of the filling procedure.
• the float 40 has an upright 45, at the top end of which a pivot pin 46 is provided. This pin is connected to a control arm 47 for a conventional inlet valve 48.
• the valve 48 is closed in the position shown in Fig. 7 and open in the position shown in Fig. 9.
• the actuating mechanism in the embodiment of Fig. 7 has a release means
• the spring unit 51 may be integrally formed with the components 49 and 50.
• the free end of the spring unit 51 is fixed in the body 53 of the mechanism in a suitable manner, e.g. by means of projecting pins 52.
• the body 53 is integrally formed with the fork 38 and thus forms a stationary element.
• a pivot pin 54 In this stationary element is fixed a pivot pin 54.
• a sensor lever 55 On the pivot pin 54, a sensor lever 55 is pivotally fixed with one end. The other end of the sensor lever is designed as a cam follower 56 which engages the upper face of the float 40, this face thus serving as a cam surface 57.
• the sensor lever 55 has a pivot pin 58, on which a release rocker arm 59 is pivotally mounted.
• the rocker arm is designed as a double-armed lever and engages the actuator 50 with one end 60 and a cam surface 62 on the locking latch 36 with the other end 61.
• a downward pressure on the release means 49 against the action of the spring 51 produces a pivotal movement of the release rocker arm 59 in the clockwise direction with respect to Fig. 7, such that the locking latch 36 is released from its locking engagement with the fork 38 and is swung to its position indicated by dash-dot lines.
• Fig. 8 only shows an instantaneous position to illu ⁇ strate the function of the mechanism.
• the piston 23 has thus been lifted so that the liquid entrapped in the piston chamber and the venting tube can flow down into the liquid sump 25.
• the air entrapped in the first U-bend 36 and parts of the second conduit leg 13 will flow out and be evacuated through the venting tube 19 and the piston chamber 22 into the free air over the liquid surface 24 in the cistern 10. This initiates the siphon function, and the flushing liquid is discharged to the flushing ramp of the water closet in the manner described above.
• the nonreturn-valve function is achieved, i.e. a sealing engagement exists between the flange 32 and the top edge of the piston chamber 22. This function is also promoted by the engagement of the latch 36 with the fork 38.
• the floats 34 should be designed with a lifting power which is so adjusted that the sealing function of the nonreturn valve is achieved before the liquid level in the flushing system has sunk to below the upper crest of the venting tube 19. In fact, it is essential that liquid remains in the venting tube and the piston chamber in order that an air plug or lock should remain in the U-bend 16 when the flush cistern is again being filled with liquid.
• Figs 7-15 show a preferred embodiment of an actuat- ing mechanism for the flushing system according to the invention.
• the actuating mechanism can also be designed otherwise, a conceivable embodiment being illus ⁇ trated in Figs 16-18.
• the release rocker arm 59 lifts the piston 23 by directly engaging and lifting a laterally-directed hook 63 on the piston 23.
• the floating bodies 34 will take over the lifting power and lift the piston to the position shown in Fig. 17.
• this embodiment functions in the same way as the embodi ⁇ ment in Figs 7-15.
• the actuating mechanism need not necessarily have a single-armed sensor lever 55. -This lever may also be double-armed, in which case a reversal of the direction of movement can be carried out in a suitable manner, such that pressures or tractions in the release means will start the flushing operation.
• a person skilled in the art may easily pro ⁇ vide such as modification of the system.
• the double siphon of the flushing system may suit- ably be formed from plastics material and be made in two halves forming a parting plane against each other, as shown in Figs 11-13.
• the dif ⁇ ferent conduit legs 12-15 need not have exactly the flat ⁇ tened shape as shown at 11, but the conduits preferably are of such a flattened shape or of oval shape to provide or promote a laminar flow. In fact, a laminar flow pro ⁇ motes the achievement of an efficient evacuation of all the air entrapped in the system at the start of the flushing operation.
• the use of an actuating mechanism with no floating bodies 34 also falls within the scope of the invention. In such a case, the starter piston can be lifted directly, as indicated in Figs 1-6.
• the actuating mechanism described above is especially well suited for the flushing system according to Figs 7-18, but can of course also be used for other flushing systems where it is desirable to prevent a restart of the flushing opera ⁇ tion until a certain minimum level of the liquid in the flush cistern has been exceeded during the filling proce ⁇ dure.
• the first conduit leg 12 may have air-suction holes 64 on different vertical levels, e.g. one level for discharging 4 litres of flushing liquid and another level for discharging 6 litres of flushing liquid. When installing the device, the fitter then plugs the air suction hole or holes 64 not to be used.

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• 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)
• Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
• Physical Water Treatments (AREA)
• Self-Closing Valves And Venting Or Aerating Valves (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Float Valves (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)

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Citations (6)

• 1993
  • 1993-06-22 SE SE9302173A patent/SE504888C2/sv unknown
• 1994
  • 1994-06-22 ES ES97108450T patent/ES2200097T3/es not_active Expired - Lifetime
  • 1994-06-22 EP EP94919955A patent/EP0725866B1/en not_active Expired - Lifetime
  • 1994-06-22 DE DE69408860T patent/DE69408860T2/de not_active Expired - Fee Related
  • 1994-06-22 SG SG1996000195A patent/SG49589A1/en unknown
  • 1994-06-22 AT AT97108450T patent/ATE247198T1/de not_active IP Right Cessation
  • 1994-06-22 WO PCT/SE1994/000618 patent/WO1995000719A1/en active IP Right Grant
  • 1994-06-22 EP EP97108450A patent/EP0794292B1/en not_active Expired - Lifetime
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  • 1994-06-22 ES ES94919955T patent/ES2113112T3/es not_active Expired - Lifetime
  • 1994-06-22 DK DK97108450T patent/DK0794292T3/da active
  • 1994-06-22 DK DK94919955.8T patent/DK0725866T3/da active
  • 1994-06-22 DE DE69433039T patent/DE69433039T2/de not_active Expired - Fee Related
  • 1994-06-22 AU AU70898/94A patent/AU7089894A/en not_active Abandoned
• 1995
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  • 1995-12-19 NO NO19955162A patent/NO320990B1/no unknown
• 1999
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• 2005
  • 2005-07-18 NO NO20053505A patent/NO20053505L/no not_active Application Discontinuation

Patent Citations (6)

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