AU2005240670B2

AU2005240670B2 - Flowable material dispensing apparatus

Info

Publication number: AU2005240670B2
Application number: AU2005240670A
Authority: AU
Inventors: Boon Lye Paul Neo
Original assignee: CALFARME SINGAPORE Pte Ltd
Current assignee: CALFARME (SINGAPORE) Pte Ltd
Priority date: 2004-05-07
Filing date: 2005-05-06
Publication date: 2011-03-10
Anticipated expiration: 2025-05-06
Also published as: MY149280A; AU2005240670A1; WO2005108688A1; SG147295A1

Description

WO 2005/108688 PCT/AU2005/000649 FLOWABLE MATERIAL DISPENSING APPARATUS Field of the Invention The present invention relates to an apparatus and method for dispensing flowable materials. In particular, the present invention has been developed for the dispensing of 5 sanitary liquids into sanitation systems in bathroom and toilet environments. It will be appreciated that the invention is not limited to this particular field of use, and that it can be applied to other applications requiring the slow release of liquids. Background It is often desirable to introduce a sanitary liquid into the water flow path of a 10 sanitation system such as a flush toilet or urinal. The sanitary liquid may be a disinfectant, detergent, pipe cleaning agent, deodorant or other such sanitary additive. Known liquid dispensing apparatus direct a volume of water from the toilet cistern or urinal inlet pipe into a container holding a concentrated volume of the sanitary additive. The water and sanitary additive are permitted to mix, and the water is subsequently directed into the toilet or urinal bowl contains a diluted volume of the sanitary liquid. A disadvantage of such devices is that the concentrated volume of sanitary additive in the container becomes increasingly diluted during use. This reduces the devices ability to deliver a consistent, regulated amount of the sanitary additive to the toilet bowl or urinal. 20 W098/27288 in the name of Calfarme (Singapore) Pte'. Ltd. discloses a dispenser for flowable materials that utilises a twin container arrangement. A duct from a toilet or urinal is connected to a first container containing a small volume of sanitary liquid, and the first container is connected to a second container, being a supply reservoir of the sanitary liquid. When water and/or air pressure from the toilet or urinal passes R:\LIBPP\667315_family\667315Camends.doc -2 through the duct, the change in pressure breaks a hydrostatic seal upon the second container, and allows a small volume of concentrated sanitary liquid to flow into the first container. When the water or air pressure ceases the hydrostatic surface tension again seals the second container, and the small volume of concentrate that previously escaped 5 from the second container to the first is allowed to flow through the duct and subsequently into the toilet bowl or urinal. A disadvantage of this system is that the design requires two separate containers, which is costly from a manufacturing perspective. In addition, the device does not provide a consistent volume of concentrated fluid for each flush of the toilet or urinal. 10 Summary It is an object of the present invention to substantially overcome or at least ameliorate one or more of the disadvantages of the prior art, or at least to provide a useful alternative. Accordingly, in a first aspect of the present disclosure there is provided a is bracket assembly for a flowable material dispensing apparatus, said bracket comprising: a first elongate bracket member having an arm extending from a free end thereof, the arm forming a substantially U shaped opening adapted to receive a neck region of a container of the flowable material dispensing apparatus to thereby mount the dispensing apparatus to the bracket assembly, and 20 a second elongate bracket member including a hook formed at a free end thereof and adapted to operatively engage a wall or rim of a sanitation system flush tank, a first engagement member formed on one of said bracket members and adapted to operatively engage one of a plurality of complementary second engagement members formed in the other said bracket member; Substitute Sheet (Rule 26) RO/AU Keceivea 24 January Luuo R:\LIBPP\667315_family\667315Camends.doc -3 wherein the first and second bracket members are engageable and are selectively adjustable to vary the length between the free ends, such that an outlet of the container is operatively located between high and low water levels of the flush tank during a flushing operation thereof. 5 In a second aspect, there is provided a flowable material dispensing apparatus comprising: a first container for holding the flowable material, the first container having an opening forming a common inlet and outlet of said container, said opening being adapted to receive a flow condition, and to operatively face downwards, 10 a second container in fluid communication with the first container, said second container having a common inlet and outlet passage in fluid communication with a sanitation system, wherein the inlet and outlet passage includes a flow restriction adapted to selectively limit the flow condition, wherein the second container is formed by a removable cap member interferingly 15 attachable to the first container such that a space is defined between an outer surface of the first container and an inner surface of the second container, wherein the flow condition from the sanitation system passes through the inlet and outlet passage into the second container and breaks a hydrostatic seal of the first container opening, permitting outflow of a volume of flowable material into the second 20 container, and wherein when the flow condition ceases the hydrostatic seal re-forms, substantially sealing the first container, and the volume of flowable material in the second container flows through the inlet and outlet passage into the sanitation system. Substitute Sheet (Rule 26) RO/AU R:\LIBPP\667315_family\667315Camends.doc In a third aspect, there is provided a flowable material dispensing apparatus comprising: a flowable material storage container, having an outlet aperture on an underside thereof, said outlet aperture operatively facing downwardly and adapted to receive a flow 5 condition, a conduit having a first end attached to the outlet aperture of the container, and a second end in fluid communication with a sanitation system, wherein the flow condition from the sanitation system passes through the conduit and breaks a hydrostatic seal of the container outlet aperture, permitting outflow of a 10 volume of flowable material from the container, and wherein when the flow condition ceases, the hydrostatic seal re-forms sealing the container outlet aperture, and the expelled volume of flowable material flows through the conduit into the sanitation system. Preferably, there is provided a flowable material dispensing apparatus comprising: 15 a first flowable material storage container, having an outlet aperture on an underside thereof, the outlet aperture operatively facing downwardly and adapted to receive a flow condition, a second container in fluid communication with the first container, the second container attachable to a conduit in fluid communication with a sanitation system, 20 wherein the second container is a removable cap member interferingly attachable to the first container such that an outer surface of the first container is separated from an inner surface of the second container by an internal cavity, wherein the flow condition from the sanitation system passes through the conduit into the second container and breaks a hydrostatic seal of the first container outlet Substitute Sheet (Rule 26) RO/AU R:\LIBPP\667315_family\667315C_amends.doc -5 aperture, permitting outflow of a volume of flowable material into the second container, and wherein when the flow condition ceases, the hydrostatic seal re-forms sealing the first container outlet aperture, and the volume of flowable material in the second 5 container flows through the conduit into the sanitation system. Preferably the second end of the bracket has a hook adapted to engage with a rim of the flush tank. The first end of the bracket preferably includes an arm with a substantially U shaped opening adapted to receive a neck region of the container. 10 One of the first and second ends preferably has a plurality of rib members and the other of the first and second ends preferably has one or more oppositely facing rib members, such that the ribs on the first and second ends interferingly mesh and provide a plurality of adjustable positions of the bracket. Preferably the inlet passage and outlet passage are formed from a single conduit, 15 and fluid flow is permitted in either direction through the conduit. The conduit is preferably attached to an underside surface of the cap member. The inlet and outlet openings of the first container are preferably formed by a single opening. The first and second containers are preferably located in a generally enclosed housing unit, the housing unit having a pivotally openable cover member. 20 The conduit preferably passes through an aperture in the housing unit. Preferably the flow condition is an air current, a liquid current, or a current consisting of a mixture of air and liquid. A portion of the conduit located between the cap member and the housing unit is preferably formed from a resilient material permitting the first container and the cap 25 sUVRld eW be removed from the housing unit whilst still connected to the conduit. (Rule 26) RO/AU WO 2005/108688 PCT/AU2005/000649 -6 The cap member is removably attached to the first container directly beneath the inlet opening, and the conduit is attached to an opposing side of the cap member, such that the conduit and inlet opening are coaxial and separated by the narrow space. The cap member preferably has a flowable material receiving well formed in its 5 base. The well is preferably arcuate in profile. The first container and the cap member are preferably connected in substantially air tight engagement. Brief Description of the Drawings 10 At least one embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure la is a partially sectioned side view of a flowable material dispensing device; Figure Ib is a bottom view of the dispensing device shown in Figure la; is Figure 2 is a sectional view of another flowable material dispensing device; Figure 3 is a sectional view of the flowable material dispensing device of Figure 2 with the housing unit included. Figure 4 is a perspective view of the flowable material dispensing device of Figures 2 and 3 with the housing unit open; 20 Figure 5 shows a conventional urinal and the connection method with the arrangement of Figures 2 to 4; and. Figure 6 is a sectional view of a further flowable material dispensing device. Detailed Description including Best Mode WO 2005/108688 PCT/AU2005/000649 -7 Figure la shows a flowable material dispensing apparatus, generally indicated by the reference numeral 10. The apparatus 10 includes a container 12 with an interior storage volume for accommodating a sanitary liquid 14. The container 12 has a neck portion 16 which extends downwardly from the underside of the container 12. The neck 5 portion 16 is externally threaded, and has an internal opening sufficiently wide to permit the container 12 to be refilled with sanitary liquid 14 as required. A cover member 18 is provided with a small central aperture 20, and is placed within the opening of neck portion 16 to substantially seal the container 12. A cap 22 with an internal thread is fitted to the complementary thread on the exterior of the neck 10 portion 16. By fastening the cap 22, a liquid tight seal is achieved between the container 12 and the cover member 18, such that the only escape route for the liquid 14 is through the aperture 20 in the cover 18. A rubber seal washer 19 may be included between the cover 18 and the cap 22, the washer also having a central aperture adjacent to aperture 20. In an embodiment not shown in the drawings, the cover 18 and cap 22 may is be integrally formed from a single component. A bracket assembly 24 is attached to the container 12 and supports the container 12 with the neck portion 16 facing downwardly. The bracket assembly 24 includes two elongated members 28a, 28b. The member 28a is L shaped in profile (as illustrated in Figure la) and has U shaped lower arms 28c (best seen in figure 1b) that are 20 adapted to support the container 12 around opposing sides of the neck 16. The member 28b includes a hook 26 that latches onto the rim of a cistern/flush tank (not shown) of a toilet system and operates to suspend the apparatus 10 within the cistern/flush tank.

WO 2005/108688 PCT/AU2005/000649 -8 The first member 28a has a number of transverse ribs 30 that extend substantially along the length of it's upright potion. The second bracket member 28b has a single raised transverse rib 32 that engages with the multiple ribs 30 of the first bracket member 28a. The two bracket members 28a, 28b are interferingly slidable relative to 5 each other to adjust the length of the bracket assembly 24. Accordingly, the suspended height of the container 12 is adjustable with respect to the rim of the cistern/flush tank, and therefore relative to the water level in the cistern/flush tank. The engagement between the opposing ribs 30, 32 on the first and second bracket members 28a, 28b ensures that the bracket assembly 24 maintains its desired 1o length after each adjustment. The bracket assembly 24 may alternatively utilise another adjustment means such as a pin and socket arrangement. Alternatively, the bracket may be made at a fixed length to correspond to a particular make or style of toilet cistern, or urinal flush tank. The operation of the dispensing apparatus 10 will now be described. In use, the 15 apparatus 10 is placed inside the cistern of a toilet, or urinal flush tank. The length of the bracket 24 is adjusted to ensure that the central aperture 20 is located vertically between the high and low water levels inside the cistern that are encountered during flushing and refilling of the cistern. After the cistern/flush tank has been flushed, the aperture 20 is above the surface 20 level of the water, and the aperture 20 is exposed to the air (atmospheric pressure) in the cistern, thereby creating a flow condition. As the water fills in the cistern/flush tank, the contact between the water in the cistern and the aperture 20 breaks the film of surface tension at the aperture 20, and the sanitary liquid 14 begins to flow out of the container 12 through aperture 20 into the cistern due to the hydrostatic pressure acting on the WO 2005/108688 PCT/AU2005/000649 -9 aperture 20. The flow of sanitary liquid 14 from the container 12 reduces the internal pressure within the container 12 until the internal pressure acting on the aperture 20 equalises with the external pressure acting on the aperture 20. At this point the flow of liquid out of the container 12 ceases. 5 When the toilet or urinal is flushed, the water in the cistern with the dispersed quantity of sanitary liquid 14 are expelled into the toilet bowl or urinal. At this point, the aperture 20 is again exposed to air in the cistern, and a small quantity of air is drawn into the container 12 through the aperture 20. The drawing of this additional air ceases when the pressure of the air in the top of the container 12 equals the atmospheric air pressure. 10 A film of the sanitary liquid 14 then occludes the opening 20, preventing the transfer of any further fluids in or out of the container 12. The water in the cistern subsequently refills after the completion of the flushing operation, and the process begins again. The volume of sanitary liquid 14 expelled from the aperture 20 can be varied by altering the area of the aperture 20. 15 Figures 2 to 4 show another flowable material dispensing apparatus, generally indicated by the reference numeral 40. The apparatus 40 includes a container 42 with an interior storage volume for accommodating a sanitary liquid 14. The container 42 has a neck portion 44 which extends downwardly from the underside of the container 42. The neck portion 44 has an internal opening which is sufficiently wide to permit the 20 container 42 to be refilled with sanitary liquid 14 as required. A cover member 46 is provided with a small central aperture 48, and is placed in the opening of the neck portion 44 to substantially seal the container 42, such that the only path for fluid to enter or exit the container 42 is through the aperture 48.

WO 2005/108688 PCT/AU2005/000649 -10 A cap 50 as best seen in Figure 2 is fitted around the neck portion 44, such that a cavity 52 is formed between the cap 50 and the cover member 46. The cap 50 attaches to the neck portion 44 with an interference, airtight fit. The cap 50 has a curved base 51 that defines a well fonred by the internal surface of the cap 50, and which represents a lower 5 portion of the cavity 52. The lowest portion of the well is located directly beneath the aperture 48 of cover member 46. The cap 50 also includes an aperture 54 located in the lowest region of the well. The apertures 48 and 54 of the cap 50 and the cover 46 are substantially co-axial. One end of a duct 56 is attached to the external surface of the cap 50, such that 10 the duct 56 joins the cap adjacent to the aperture 54, at the bottom of the well, and there is a fluid flow path from the duct 56 into the cavity 52, through aperture 54. The duct 56 may be formed from flexible rubber, an elastomer or another suitable material. As seen in Figures 3 and 4, the duct 56 is fitted at its other end to a housing unit 58a. The housing unit 58a is a receptacle that can be mounted to a wall or is other such surface in a bathroom environment. The housing unit 58a has a door 58b shown in Figure 4 which pivotally opens to provide access to the container 42 for refilling of the sanitary liquid 14 and maintenance purposes. A lock may be fitted to ensure the door 58b is not opened by unauthorised persons. As shown in Figure 3 the housing unit 58a has a main duct 60 which is directly 20 connected to a mains flow pipe 66 of the toilet cistern or urinal. An elbow connector 62 attaches the main duct 60 to the housing unit 58a. The connector 62 includes a flow restriction device such as a slidable plastic or steel sphere 64, or other such adjustable control valve. The flow restriction device selectively restricts and substantially prevents WO 2005/108688 PCT/AU2005/000649 - 11 water from flowing into the duct 56, whilst at the same time substantially impeding the exiting of the sanitary liquid 14 from the duct 56. The operation of the device 40 will now be described. The container 42 is filled with a sanitary liquid 14 such as a disinfectant or deodorant, and the container 42 is 5 mounted inside the housing unit 58a. When the toilet or urinal is flushed, a flow condition is created as fluid is diverted through the main duct 60 towards the housing unit 58a. The fluid may be a burst of air, water from the toilet cistern, or a combination of water and air. The fluid flow condition subsequently passes through the connector 62 and io enters into the flexible duct 56. As the flow condition passes through the connector, the flow restricting sphere reduces the magnitude of the flow condition. The fluid passes through the flexible duct 56 and through the aperture 54 in the cap 50 into cavity 52. The fluid then breaks the hydrostatic seal of liquid surface tension acting in the aperture 48 of the cover 46. A volume of sanitary liquid is then permitted to escape 15 through aperture 48. The excreted sanitary liquid collects in the well of the cap 50. Once the flow condition from the toilet or urinal has ceased, the sanitary liquid drains from the well through aperture 54 in the cap 50. The sanitary liquid 14 mixes with the fluid and subsequently drains back into the toilet or urinal system through the main duct 60. When the fluid inflow from the toilet has ceased, the aperture 48 in the cover 46 20 is again exposed to air, such that the film of surface tension is permitted to reform. The surface tension prevents the out flow of any further sanitary liquid 14 from the container 42 until a further fluid inflow from the toilet or urinal occurs. Figure 5 illustrates an example of the connection between the liquid dispensing WO 2005/108688 PCT/AU2005/000649 - 12 device 40 and a convention urinal that enables the flow condition to be created. Water from the mains pipe 66 flows into the urinal during a flushing operation. A portion of the water from the mains pipe is diverted along the main duct 60 in the direction of the arrow. Air may also be directed along main duct 60. The air and/or water subsequently interact 5 with the flowable material dispensing device 40 as described above. In the arrangement shown in Figure 6, the sanitary liquid 14 inside the container 40 is directly in contact with aperture 54 of the cap 50. The arrangement of Figure 6 is particularly useful where the container 40 is located within a cisten/flush tank. The flexible duct 56 need merely be located at least 10 partly under water when the cistern/flush tank is full. As such, upon flushing and emptying of the cistern/flush tank, a change in pressure within the duct 56 is sufficient to extract a small quantity of the sanitary liquid 14 from the container 40, which is then mixed with flushing water for the present flush or a further flush. Embodiments of the invention may also be connected to other types of sanitation is systems such as wash basins and the like. An advantage of the arrangement of Figures 2 to 4 is that the cap 50 provides a predefined volume for containment of the sanitary liquid 14. In the event that the fluid flow condition through the main duct 60 is larger than normal, the cap 50 prevents the excretion of an excessive amount of the sanitary liquid 14. This ensures that the sanitary 20 liquid 14 is not consumed excessively quickly. A further advantage of the arrangement of Figures 2 to 4 is that the flexible duct 56 permits the container 42 to be extracted from the housing unit 58 whilst the duct 56 is still attached to the cap 50. The container 42 can be oriented upside down WO 2005/108688 PCT/AU2005/000649 - 13 before the cap 50 is removed. This prevents the sanitary liquid 14 from being spilled during refilling and maintenance. Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many 5 other forms.

Claims

1. A bracket assembly for a flowable material dispensing apparatus, said bracket 5 comprising: a first elongate bracket member having an arm extending from a free end thereof, the arm forming a substantially U shaped opening adapted to receive a neck region of a container of the flowable material dispensing apparatus to thereby mount the dispensing apparatus to the bracket assembly, 10 a second elongate bracket member including a hook formed at a free end thereof and adapted to operatively engage a wall or rim of a sanitation system flush tank, and a first engagement member formed on one of said bracket members and adapted to operatively engage one of a plurality of complementary second engagement members formed in the other said bracket member; 15 wherein the first and second bracket members are engageable and are selectively adjustable to vary the length between the free ends, such that an outlet of the container is operatively located between high and low water levels of the flush tank during a flushing operation thereof. 20

2. The bracket assembly of claim 1, wherein the first engagement member comprises a pin and the second engagement member comprises one or more sockets.

3. The bracket assembly of claim 1 wherein the second engagement member is formed by a plurality of rib members and the first engagement member is formed by an 2981874 I.DOC 667315AU - 15 oppositely facing rib member, such that the rib members on the bracket members inferingly mesh to provide a plurality of adjustable positions of the bracket assembly.

4. A flowable material dispensing apparatus comprising: 5 a first container for holding the flowable material, the first container having an inlet opening adapted to receive a flow condition, and an outlet opening, said inlet and outlet openings being adapted to operatively face downwards, a second container in fluid communication with the first container, said second container having at least one inlet passage in fluid communication with a sanitation 10 system, and an outlet passage in fluid communication with the sanitation system, wherein the inlet passage includes a flow restriction adapted to selectively limit the flow condition, wherein the second container has a neck region formed with a removable cap member interferingly attachable to the first container such that an outer surface of the first 15 container is separated from an inner surface of the second container by a narrow space therebetween, and a bracket assembly according to any one of claims I to 3 by which at least the second container is mounted thereto via the neck region, wherein the flow condition from the sanitation system passes through the inlet 20 passage into the second container and breaks a hydrostatic seal of the first container outlet opening, permitting outflow of a volume of flowable material into the second container, and 2981874 I.DOC 667315AU - 16 wherein when the flow condition ceases the hydrostatic seal re-forms, substantially sealing the first container, and the volume of flowable material in the second container flows through the outlet passage into the sanitation system.

5 5. The apparatus of claim 4, wherein the inlet and outlet passage is formed from a single conduit, and fluid flow is permitted in either direction through the conduit.

6. The apparatus of claim 5, wherein the conduit is attached to an underside surface of the cap member. 10

7. The apparatus of claim 5 or 6, wherein the first and second containers are located in a generally enclosed housing unit, the housing unit having a pivotally openable cover member. 15

8. The apparatus of claim 7, wherein the conduit passes through an aperture in the housing unit.

9. The apparatus of any one of claims 4 to 8, wherein the flow condition is an air current, a liquid current, or a current consisting of a mixture of air and liquid. 20

10. The apparatus of claim 9, wherein a portion of the conduit located between said cap member and the housing unit is formed from a resilient material permitting the first container and the cap member to be removed from the housing unit whilst still connected to the conduit. 2981874 I.DOC 667315AU - 17

11. The apparatus of any one of claims 5 to 10, wherein the cap member is removably attached to the first container directly beneath the inlet and outlet opening, and the conduit is attached to an opposing side of the cap member, such that the conduit and 5 inlet and outlet opening are coaxial and separated by the narrow space.

12. The apparatus of any one of claims 4 to 11, wherein said cap member has a flowable material receiving well formed in its base. 10

13. The apparatus of claim 12, wherein the well is arcuate in profile.

14. The apparatus of any one of claims 4 to 13, wherein the first container and the cap member are connected in substantially air tight engagement.

15 15. A flowable material dispensing apparatus comprising: a first flowable material storage container, having an outlet aperture on an underside thereof, said outlet aperture operatively facing downwardly and adapted to receive a flow condition, a second container in fluid communication with the first container, said second 20 container attachable to a conduit in fluid communication with a sanitation system, a bracket assembly according to any one of claims I to 3; wherein the second container is a removable cap member interferingly attachable to the first container such that an outer surface of the first container is separated from an inner surface of the second container by an internal cavity, and 2981874 I.DOC 667315AU - 18 wherein an area of the first container at which the cap is attachable forms the neck region by which at least the second container is mounted to the bracket assemby, wherein the flow condition from the sanitation system passes through the conduit into the second container and breaks a hydrostatic seal of the first container outlet 5 aperture, permitting outflow of a volume of flowable material into the second container, and wherein when the flow condition ceases, the hydrostatic seal re-forms sealing the first container outlet aperture, and the volume of flowable material in the second container flows through the conduit into the sanitation system. 10

16. A flowable material dispensing apparatus comprising: a bracket assembly according to any one of claims I to 3; a flowable material storage container, having an outlet aperture on an underside thereof, said outlet aperture operatively facing downwardly and adapted to receive a flow 15 condition, the container having a neck region associated with the outlet aperture by which the container is mounted to the bracket assembly, a conduit attached to the outlet aperture of the container, the conduit being in fluid communication with a sanitation system, wherein the flow condition from the sanitation system passes through the conduit 20 and breaks a hydrostatic seal of the container outlet aperture, permitting outflow of a volume of flowable material from the container, and wherein when the flow condition ceases, the hydrostatic seal re-forms sealing the container outlet aperture, and the expelled volume of flowable material flows through the conduit into the sanitation system. 29818741 .DOC 667315AU - 19

17. A bracket assembly for a flowable material dispensing apparatus substantially as described herein with reference to Figures la and lb, and any one of Figures 2 to 4 or Figure 6 of the drawings. 5 Dated this 21st day of January 2011 CALFARME (SINGAPORE) PTE LTD Patent Attorneys for the Applicant Spruson& Ferguson 10