IE72106B1 - An atomiser - Google Patents

Description

.An_Atomiserl This invention relates to an atomiser and in particular an atomiser for producing a fine spray mist of water.

It is known to provide a spring water atomiser comprising a pressurised container of water which can be discharged in a fine spray via gas driven aerosol. Until recently a CFC gas was used for propulsion but now more environmentally acceptable gases are used in the aerosol. A pressurised aerosol is not,» however, suitable for all ages and for all environments.

The present invention is directed towards the provision of a liquid spray device which overcomes this problem.

The invention is concerned with an atomiser of the type comprising a container for liquid, a pump mounted in an associated opening in the container, the pump having an inlet for communication with an interior of the container and an outlet for dispensing liquid from the container, an air vent passage on the pump communicating between an interior and an exterior of the container, and filter means to purify air drawn into the container through the vent passage when liquid is discharged from the container.

Patent Specifications ΕΡ-Ά-0487412 and ΞΡ-Α-0189549 show pump discharge apparatus of this general type for dispensing liquid from a bottle and filtering vent air sucked into the bottle.

Patent Specifications WO-A-9201625, US-A-4917271 and woA-9212065 disclose various types of squeeze bottles each having a filter for air vented into the bottle after discharge of liquid from the bottle. 721 06 - 2 The present invention is characterised in that the pump has means to dispense liquid from the container as an atomised spray, and the filter means comprises a filter assembly which is sealingly engagable within the opening in the container, the filter assembly having at least one through hole for through passage of vent air with a filter mounted across the or each hole, and the filter assembly having means for reception of the pump, a housing of the pump passing through an associated opening in the filter assembly with an airtight seal in the opening engaging between the filter assembly and the pump housing.

In a preferred embodiment of the invention the filter assembly comprises an outer housing and a complementary inner housing engagable within the outer housing, the filter and the airtight seal being retained between the inner and outer housings.

In a particularly preferred embodiment the filter assembly comprises an outer housing and a complementary inner housing engagable within the outer housing, the outer housing having a tubular body defining a bore for reception of the inner housing, a lower end of the outer housing having a stepped through hole an inner portion of which receives an 0-ring seal, an upper end of the outer housing having an outwardly extending flange with an upstanding peripheral rim which sealingly engages an inner surface of a neck of the container, a number of spacedapart through holes being provided in the flange, the inner housing having a tubular body defining a bore for reception of the pump housing, a flanged upper end of the inner housing having a number of through holes associated with the holes in the flange of the outer housing, the inner housing being engagable within the outer housing to securely engage an annular filter ring between the flanges of the housings, a bottom wall of the inner housing having a through hole associated with the through hole in the outer housing, the pump housing passing downwardly through the inner housing and projecting through the holes with an airtight seal being made with the pump housing at the bottom of the housings by the O-ring seal.

In another embodiment the filter has openings for through passage of air, said openings being sized to block harmful bacteria. Typically the openings are of a size no greater than 0.2 microns. Thus, advantageously the filter will trap any harmful bacteria in the vent air drawn into the container. At the same time there is sufficient air movement through the filter so that the spray remains effective and fine. The filter should preferably be of a material which is resistant to the liquid in the container so it will not disintegrate or lose its effectiveness after contact with the liquid in the container.

In a further embodiment there is provided an atomiser having pure water within the container for discharge by the pump as an atomised spray.

In a further aspect of the invention there is provided a filter assembly for an atomiser of the type previously described, the filter assembly being sealafoly engagable within an opening in the container, the filter assembly having at least one through hole for through passage of vent air with a filter mounted across the or each hole, and the filter assembly having means for reception of a pump, a housing of the pump being engagable through an associated opening in the filter assembly, an airtight seal being mounted in the opening for engaging and sealing between the filter assembly and the pump housing.

The invention will be more clearly understood by the following description of some embodiments thereof, given by way of example only, with reference to the accompanying drawings, in whichsFig. 1 is a perspective view of an atomiser; Fig. 2 is an elevetional, partially sectioned view of a pump portion of the atomiser; Fig. 3 is a plan view of a filter portion of the atomiser; Fig. 4 is a sectional elevetional view taken along the line ZV~IV of Fig. 3; Fig. 5 is a detail sectional view of portion of the filter shown in Fig. 4; Fig. β is a perspective view of an alternative type of filter for use with the atomiser; Fig. 7 is an exploded elevational view of another filter assembly for the atomiser according to the invention; Fig. 8 is a plan view of portion of the filter of Fig. 7; Fig. 9 is a plan view of another portion of the filter of Fig. 7; and Fig. 10 is a detail sectional elevational view of the filter of Fig. 7 shown mounted on an atomiser bottle.

Referring to the drawings, and initially to Figs. 1 to 5 thereof, there is illustrated a water atomiser indicated generally by the reference numeral 1. The water atomiser has a clear plastics container 2. A pump 3 is mounted on the container 2 for dispensing water from the container as an atomised spray. The pump 3 incorporates an air vent passage communicating between an interior and an exterior of the container 2 to allow air into the container 2 as water is discharged therefrom. Mounted on the pump 3 across the vent passage is a filter 4 to purify air drawn into the container 2 when water is discharged from the container 2.

The pump 3 has a cylindrical housing 9 of plastics material. A spring-loaded plunger 5 is slidably mounted within the housing 9 and projects outwardly from an upper end. of the housing 9. A pump inlet β at a lower end of the housing 4 has a feed tube 7 attached thereto and extending downwardly to a bottom of the container 2. A fluid passage through the plunger 5 leads to a pump outlet 8. A nozzle 10 with a discharge opening 11 is mounted at the pump outlet 8 to produce a fine atomised water mist when the pump 3 is operated.

A mounting flange 14 projects outwardly of the housing 9. An outer edge 15 of the flange 14 is a snap-fit into engagement with a periphery of an opening at a top of the container 2 for mounting the pump 3 on the container 2. A vent passage passes through the housing 9 to vent air into the container 2 as the pump 3 is operated. The filter 4 is mounted between the housing 9 and the flange 14 across the vent passage to filter air vented into the container 2.

Referring now in particular to Figs. 3 to 5 the filter 4 is shown in more detail. The filter 4 comprises a plastics holder 20 having a tubular body 21 which is a sleeved fit on an exterior of the housing 9. An annular flange 22 is provided at an upper end of the body 21 and ... S has an. upstanding peripheral rim 23. A number of spacedapart through holes 24 forming air vent holes are provided around the flange 22. These through holes 24 are covered by an annular membrane filter 26 having a pore size of 0.2 microns. It will be noted that an inwardly directed lip 27 is provided at a lower end of the body 21 to form an energy director for ultrasonic welding of the holder 20 to an exterior of the pump housing 9 . Similarly an upper end of the rim 23 is provided with a pointed tip 28 forming an energy director for ultrasonic welding of the rim 23 to an underside of the flange 14 of the pump 3.

In use, the container 2 is filled with pure water. The pump 3 can be operated by depressing and releasing the plunger 5 as desired to discharge water in a fine atomised spray. Ambient air is drawn in through the vent passage as the pump 3 is operated and is filtered as it passes through the membrane filter 26 and into the container 2.

The filter pore size is such that it forms a barrier to any bacteria thus ensuring the purity of the water within the container 2 is maintained during use. There is, however, sufficient air movement through the filter so that the spray remains effective and fine. A typical Gurley air flow for the filter is rated at 27.4 seconds/100 cc. The membrane is hydrophobic with a water breakthrough at 32 psi.

Referring now to Fig. 6 there is illustrated another filter holder 30. This is similar to the holder described previously with reference to Figs. 3 to 5 and like parts are assigned the same reference numerals. In this case through holes 31 for through passage of air are provided where the body 21 meets the flange 22.

Referring now to Figs. 7 to 10, an alternative filter assembly for the atomiser according to the invention is shown and indicated generally by the reference numeral 35. The filter assembly 35 comprises an outer housing 36 and a complementary inner housing 37 engagable within the outer housing 36. The outer housing 36 has a tubular body 38 defining a bore 39 for reception of the inner housing 37 and through passage of the pump housing 9. A lower end 40 of the housing 38 has a stepped central through hole 41, an inner portion 42 of which receives an O-ring seal 43. An outwardly extending flange 44 at an upper end of the housing 38 has an upstanding peripheral rim 45. A number of spaced-apart through holes 46 are provided in the flange 44. A retaining ridge 47 is provided on an inner side wall of the rim 45 for retention of the inner housing 37 within the outer housing 35. The inner housing 37 has a tubular body 48 defining a bore 49 for reception of the pump housing 9. A flanged upper end 50 of the inner housing 37 has a number of through holes 51 associated with the holes 46 in the outer housing 36. The inner housing 37 is engagable within the outer housing 35 to securely engage an annular filter ring 52 between the flanges 44, 50 of the housings 36, 37. A bottom wall of the inner housing has a central through hole 53. Fig. 10 shows the filter assembly 35 mounted within a neck 54 of the container 2. It will be noted that an outer surface 55 of the rim 45 of the outer housing 36 sealinglv engages an inner surface of the neck 54. The filter assembly 35 is a push fit into engagement with the neck 54 of the container 2. The pump 3 is mounted on the container 2 with the pump housing 9 passing downwardly through the inner housing 37 and projecting through the holes 41, 53 with an airtight seal being made with the pump housing 9 at the bottom of the housings 36, 37 by the O-ring seal 43. Vent air is thus obliged to pass through the filter ring 52 into the container 2.

The invention provides a water atomiser which is mechanically operated for delivery of a finely atomised mist of pure water. The water is discharged as an aerated spray which gives a fine distribution of water mist.

Advantageously vent air drawn into the container during use is filtered to prevent contamination of the water in the container. The filter construction and. materials are chosen such that the filter repels water for good filtration without unduly restricting vent air flow through the filter which would adversely affect spray formation.

A chemical preservative could be added to the water in the container to neutralise any bacteria, spores or the like which might enter the bottle from a contaminated ambient air supply. However, this would detract from the purity of the water and would thus make it less attractive or in some cases unacceptable to many people. By use of mechanical filtration advantageously the purity of the water is maintained to provide a natural product which is safe on all skins, including a young child's skin, without risk of allergies for example which might arise with the use of a chemical preservative.

Claims (8)

1. An atomiser, comprising a container (2) for liquid, a pump (3) mounted in an associated opening in the container (2), the pump (3) having an inlet (6,7) for communication with an interior of the container (2) and an outlet (11) for dispensing liquid from the container (2), an air vent passage on the pump (3) communicating between an interior and an exterior of the container (2), and filter means (35) to purify air drawn into the container (2) through the vent passage when liquid is discharged from the container (2), characterised in that the pump (3) has means to dispense liquid from the container (2) as an atomised spray, and the filter means comprises a filter assembly (35) which is sealingly engagable within the opening (54) in the container (2), the filter assembly (35) having at least one through hole (46, 51) for through passage of vent air with a filter (52) mounted across the or each hole (46, 51), and the filter assembly (35) having means for reception of the pump (3), a housing (9) of the pump (3) passing through an associated opening (41, 53) in the filter assembly (35) with an airtight seal (43) in the opening (41, 53) engaging between the filter assembly (35) and the pump housing (9).

2. An atomiser as claimed in claim 1 wherein the filter assembly (35) comprises an outer housing (36) and a complementary inner housing (37) engagable within the outer housing (36), the filter (52) and the airtight seal (43) being retained between the inner and outer housings (36, 37).

3. An atomiser as claimed in claim 1 or 2 wherein the filter assembly (35) comprises an outer housing (36) and a complementary inner housing (37) engagable within the outer housing (36), the outer housing (36) having a tubular body (38) defining a bore (39) for reception of the inner housing (37), a lower end (40) of the outer housing (36) having a stepped through hole (41) an inner portion (42) of which receives an 0-ring seal (43), an upper end of the outer housing (36) having an outwardly extending flange (44) with an upstanding peripheral rim (45) which sealingly engages an inner surface of a neck (54) of the container (2), a number of spaced-apart through holes (46) being provided in the flange (44), the inner housing (37) having a tubular body (48) defining a bore (49) for reception of the pump housing (9), a flanged upper end (50) of the inner housing (37) having a number of through holes (51) associated with the holes (46) in the flange (44) of the outer housing (36), the inner housing (37) being engagable within the outer housing (36) to securely engage an annular filter ring (52) between the flanges (44, 50) of the housings (36, 37), a bottom wall of the inner housing (37) having a through hole (53) associated with the through hole (41) in the outer housing (36), the pump housing (9) passing downwardly through the inner housing (37) and projecting through the holes (41, 53) with an airtight seal being made with the pump housing (9) at the bottom of the housings (36, 37) by the O-ring seal (43).

4. An atomiser as claimed in any preceding claim wherein the filter has openings for through passage of air, said openings being sized to block harmful bacteria, and wherein said openings are of a size no greater than 0.2 microns, and wherein the filter is of a material which is resistant to the liquid in the container.

5., An atomiser as claimed in any preceding claim having pure water within the container for discharge by the pump as an atomised spray.

6. A filter assembly (35) for an atomiser as claimed in 5 any preceding claim, the filter assembly (35) being sealingly engagable within an opening (54) in the container (2), the filter assembly (35) having at least one through hole (46, 51) for through passage of vent air with a filter (52) mounted across the or

7. 10 each hole (46, 51), and the filter assembly (35) having means for reception of a pump (3), a housing (9) of the pump (3) being engagable through an associated opening (41, 53) in the filter assembly (35), an airtight seal (43) being mounted in the

8. 15 opening (41, 53) for engaging and sealing between the filter assembly (35) and the pump housing (9).