DE2223560C2 - Device for dispensing foam - Google Patents

Description

The invention relates to a device for dispensing foam, which is produced by mixing a foamable Liquid is created with air, containing a partially with the liquid and partially with air filled container, which has a deformable wall for the purpose of increasing its internal pressure and closed by a cap, wherein a foam generator is in the form of an elongated hollow body from the area of the cap through the air space of the container into its liquid space extends and at its upper end in connection with a foam outlet channel arranged in the cap.

Ί dung stands.

Devices for dispensing are already known and applying liquids, in which the container containing the liquid to facilitate the Dispensing the liquid compressible and

"> is changeable in shape. Such known devices are on the one hand for cleaning purposes and for applying glue and on the other hand for applying Foam on the skin in use, with a sponge or in the dispensing opening of the container

ι> wick part is provided.

In newer foam dispensers, a foam generator is provided in the container, which with the foamable liquid is in contact with the foam generator by dispensing foam

in compressing the container and the foam generator is adapted. However, these foam dispensers have the disadvantage that a repeated Compression of the shape-changeable container and the foam generator is necessary to achieve the

2ΐ to effect dispensing of foam from the device, in particular it is necessary in such known foam dispensing devices to constantly compress a porous element of the foam generator in order to keep the foamable liquid in the porous

id element to generate foam with air mix to be dispensed from the device.

Other recent foam dispensers have been provided with a pressurized container to cause the foamable liquid in the container to foam and dispense the foam from the container. Such foam dispensers with pressurized containers have the disadvantage that the pressurized gas required to generate the foam and dispense it does not renew itself, which limits the useful life of such foam dispensers. Also, for such foam. Dispensers require containers that can withstand the substantial internal pressure, which is highest during assembly, resulting in increased manufacturing costs and an increased sales price.
Furthermore, from US-PS 34 28 222 a generic device for dispensing foam is known which has a porous hollow body which acts like a wick and thus sucks the liquid up through the capillary wick. This wick is spongy in nature and closed at its lower end. When the container is now compressed, the compressed air flows through that part of the hollow body which extends through the air space and has soaked up with the liquid as a result of the wicking effect.

This part has a fairly large open cross-sectional area (due to the very numerous pore openings therein), so that the increased internal pressure very largely and mostly even completely through the Wall of the hollow body dissipated through to the outside without causing an (at least noteworthy) To lead differential pressure, which could push the liquid up in the hollow body. But that has Disadvantage that the internal pressure builds up so quickly

outwardly dissipated that repeated squeezing of the container is necessary to get a usable amount of foam out of the device press.

Finally, from GB-PS 6 95 627 a fire extinguishing nozzle is known in which the liquid to be foamed must already be made available under pressure, whereupon it must pass through various air-sucking chambers before it emerges from the mouthpiece of the nozzle. This known device can ^; However, it cannot be operated by hand and is dependent on a pressurized supply container for the liquid.

It is therefore the object of the present invention to provide a device for dispensing foam create which is free from the disadvantages of the known devices and which allows both the in the device to be foamed liquid as well as air by simply squeezing them to put under pressure, to mix and to dispense as a foam with optimal properties.

According to the invention, this object is achieved in that the foam generator is a non-porous hollow body which has an axially open tube part at its lower end and which is spaced above the Liquid level contains a mixing chamber, in which at least one is in communication with the air space standing passage opening opens, the Gesami cross-sectional areas of all air passage openings are smaller than the inner cross-sectional area of the Hollow body.

The technical progress that can be achieved by the subject of the application consists in the fact that a repeated It is no longer necessary to compress the container in the manner of a pumping process in order to dispense foam is, rather a single compression of the container for a longer continuous delivery of foam is sufficient.

The generation of foam with optimal properties, i.e. foam with the desired expansion, Stability and wetting properties depend on the type of foamable liquid used and on the ali from the foam dispenser. Such compositions have recently become foamable liquids which foams when used in the foam dispenser of the present invention with optimal properties.

In the drawing, embodiments of the foam dispensing device according to the invention are for example shown, namely shows

1 shows a side view of the first embodiment of the foam dispensing device, with the wall broken away at the front in a section of the container \: · \

F i g. Figure 2 is a top plan view of the foam dispenser according to Fig. 1,

3 shows a central longitudinal section of the upper part the foam dispensing device according to FIG. 1,

F i g. 4 shows a section along line 4-4 in FIG. 3,

F i g. 5 shows a central longitudinal section of the upper part of the second embodiment of the foam dispensing device,

6 shows a central longitudinal section of the third Embodiment of the foam dispenser with the middle section broken away

7 shows a central longitudinal section of the fourth embodiment of the foam dispensing device, wherein the middle section has broken away,

F i g. 8 is a central longitudinal section of the upper part the fifth embodiment of the foam dispenser,

Fi g. 9 shows a central longitudinal section of a foam control nozzle for use on foam dispensing devices according to the invention,

10 shows a central longitudinal section of the uppermost part of the sixth embodiment of the foam dispensing device,
11 shows a section along the line 11-11 in FIG. 10,

i.o Fig. 12 a central longitudinal section of the seventh Embodiment of the foam dispenser with the central portion broken away.

The first embodiment (Fig. 1 to 4) of the foam dispensing device 10 can, for example, for

is dispensing cleaning or polishing agents, beauty or toilet products or food are used. The foam dispenser 10 has a shape-changeable container 12 for receiving an amount of foamable liquid 14 and open to air. The container 12 has a generally cylindrical shape with one closed Bottom 16 and is preferably made of a slightly changeable material, such as polyethylene, to an inward change in shape or compression roughly along the entire height of the To enable the container, the interior of which is partly of the foamable liquid 14 and partly of Air is taken. Appropriately, in the interior of the container 12 always at least one

3ö small amount of air or of another suitable gas are above the foamable liquid 14.

The container 12 is provided in the region of its upper end with an opening 18 which communicates with the interior

of the container 12 is in communication. The opening 18 is formed by an upright ring wall 20, the outer circumferential surface is provided with a Gev / inde, onto which the cover 22 is detachably screwed.

The cover 22 is made of a rigid plastic

ίι> or another suitable material and is with an outwardly protruding projection 24 containing the dispensing opening 26. The dispensing opening 26 sees in connection with the central cavity 28 in the lid 22, which is the connection between the Dispensing opening 26 and the opening 18 on the container 12 produces.

The foam dispensing device 10 contains a foam generator 30 which is located in the interior of the container 12 is arranged and designed so that by changing the shape of the wall of the container 12 inwardly the Generation of foam from the foamable liquid 14 and air is effected.

The foam generator 30 has a hanging hollow body 32, which is inside the container 12

Forms conduit for the liquid 14 to the opening 18 and has an air passage 34 through which air in the hollow body 32 can enter. By squeezing the container 12 is a flow of the Liquid 14 through the hollow body 32 upwards and

causes air to flow into the hollow body 32 to generate the foam. The hollow body 32 comprises an upper part 36 and a lower tubular part 38 which extends approximately centrally in the container 12 down to near extends to the bottom 16, so that the pipe part 38 is constantly immersed in the liquid 14. The pipe part 38 has an approximately cylindrical shape and consists of a non-porous polyethylene or other suitable non-porous material. The inner diameter

of the pipe part 38 should be between 0.8 and 12.7 mm, preferably between 1.6 and 6.4 mm, to the desired rate of flow of the liquid 14 upwards within the pipe part 38 during to enable the generation of the foam. The upper end of the lower pipe part 38 is within the Upper part 36 received and secured in a suitable manner, so that the lower 'pipe part 38 of the Upper part 36 is held. If necessary, the entire hollow body 32 with the upper part 36 and the lower Pipe part 38 be made from one piece.

The upper part 36 of the hollow body 32 has a non-porous ring part 40, which is uniform, radial distance within the annular wall 20 of the container 12 is located. The ring part 40 is limited with - Its inner peripheral surface, the mixing chamber 42 of the . Foam generator 30. The mixing chamber 42 is on the one hand with the central cavity 28 in the Lid 22 and on the other hand with the free cross section of the lower pipe part 38 via a passage 44 in Connection, the free cross section of which is approximately equal to the free cross section of the pipe part 38. The top 36 of the hollow body 32 has a flat annular flange 46 with an outer, downwardly directed annular collar 48 on, which engages over an upwardly directed collar 50 on the annular wall 20 of the container 12 and with this is releasably connected. The annular collar 48 expediently points inwards at its lower end directed, annular lip, with an outwardly directed, annular lip on the collar 50 cooperates so that the foam generator 30 is releasably secured in the opening 18 of the container 12 and is supported.

An upwardly extending ring 52 is integral with the ring flange 46 of the upper part 36 connected, which has a beveled, upper end surface 54. The end face 54 is opposite in the Cover 22 a likewise beveled annular surface 56 is provided. The end surface 54 and the annular surface 56 are arranged so that a sealing effect is created between these two surfaces when the lid 22 in the Thread on the outer peripheral surface of the annular wall 20 of the container 12 is tightened (Figure 3), This The sealing action prevents foam from flowing out of the central cavity 28 to the dispensing opening 26. If, on the other hand, the lid 22 is unscrewed in the thread relative to the container 12, the annular surface is released 56 from the end surface 54, whereby the sealing effect between these two surfaces is canceled and a Connection for the outflow of foam from the cavity 28 to the dispensing opening 26 is established.

The air passage 34 in the ring part 40 of the hollow body 32 of the foam generator 30 consists of an opening 58 or a plurality of openings 58.

Preferably, four such openings 58 are evenly distributed over the circumference of the ring part 40 of the hollow body 32. The openings 58 are inclined relative to the longitudinal axis of the hollow body 32 at an angle to the outside. The openings 58 are used to allow air to flow into the mixing chamber 42 when the container 12 is completely or partially compressed. The cross-sectional areas of the round openings 58 are designed to restrict the flow of air when the container 12 is compressed so that the pressure of the air in the interior of the container 2 acting on the surface of the foamable liquid 14 pushes the foamable liquid 14 through the lower Pipe part 38 of the foam generator 30 presses upwards into the mixing chamber 42. At the same time, the air flowing through the openings 58 from the interior of the container 12 into the mixing chamber 42 brings about a mixing of foamable liquid 14 and air within the mixing chamber 42 in order to generate the foam. The number of openings 58 in the ring part 40 is arbitrary per se. The cross-sectional area of each opening 58 should, however, be 0.645 to 6.45 square mm. If the inner diameter of the lower pipe part 38 of the hollow body 32 is 3.8 mm, four openings 58 with a diameter of 1 mm each should be provided in order to produce an effective generation of foam during use of the foam dispensing device 10. The number of openings 58 in the ring part made of a rigid material! 40 of the upper part 36 of the hollow body 32 should be selected taking into account approximately the following relationship. The free cross-sectional area of the mixing chamber 42 itself should relate to the free cross-sectional area of the lower tube part 38 in the same way as the free cross-sectional area of the lower tube part 38 to the entire cross-sectional area of the openings 58.

Instead of the openings 58, a wall part made of porous material can be used in the upper part 36 of the foam generator 30 Material can be provided which replaces the air passage 34. Porous materials have proven to be suitable proven in which both liquid and air have significant movements in both the main direction of the flow as well as across it are subject. Such properties occur in porous materials with considerable twisting of the pores, for example in the case of fiber materials, multicellular plastic foams and similar materials. A fiber material with a porosity of 4 to is preferred 40 pores per linear cm. Since the porosity of random fiber materials increases immediately

ίο is to be determined, the relative air passage speed through the porous material is better defined as the decisive property. Optimal porous materials for this purpose are those whose air resistance - measured as the pressure drop of the air in mm of water column when passing through the 12.7 mm thick porous material at a speed of 106.68 m per minute - between 1.14 and 25.4 mm lies. When carrying out this measurement of the air resistance, the porous material should flow through a cross-sectional area of 645 square mm. The absorbing properties of the porous material in relation to the foamable liquid 14 have an influence on the quality of the foam produced, namely essentially as a function of the wetting properties of the porous material. These properties determine the speed of expansion of the foamable liquid 14, both in the main direction of flow and across it, and therefore influence the effectiveness of the contact between the surfaces of the air and the foamable liquid 14. Porous materials particularly suitable in this regard are such made from polyurethane, nylon, rayon and polypropylene. Porous materials made of polyurethane with an air resistance that corresponds to a pressure drop of 1.14 to 25.4 mm water column are particularly suitable.
Inside the hollow body 32 is immediately before the

Mixing chamber 42 has a ball check valve 60 arranged to allow a flow of foamable liquid 14 inner hall) of the lower pipe part 38 upwards into the mixing chamber 42 when the shape-changeable container 12 and a backflow of liquid 14 or foam from the Mixing chamber 42 prevented by the tubular part 38 down when the container 12 is released. Through this the liquid 14 is in the upright position of the foam dispensing device 10 in the pipe part 38 practically held in its entire length, reducing the time it takes to squeeze the Container 12 zv / ecks re-use of the foam dispenser 10 is required to be foamable To press liquid 14 into the mixing chamber 42. The ball of the ball check valve 60 sits on the in the upper part 36 of the foam generator 30 next to the mixing chamber 42 provided upper conical surface 62 on. The passage 44, which establishes the connection to the free cross section of the lower pipe part 38, is located is in the apex of the conical surface 62. The ball of the ball check valve 60 sits in the usual Manner due to gravity sealing on the conical surface 62. When the Container 12 is the ball of the ball check valve 60 by pressing on its lower surface Liquid 14 is lifted off the conical surface 62, so that liquid 14 flows into the mixing chamber 42. at a release of the container 12 sets the ball of the ball check valve 60 against it again on the Conical surface 62, so that a reduced pressure is formed within the upper part of the pipe part 38, which holds the foamable liquid 14 in the pipe part 38.

The foam dispensing device 10 is also provided with a homogenizing cover layer 64 which is arranged between the mixing chamber 42 and the dispensing opening 26. The cover layer 64 is used to To regulate the density of the foam to be dispensed and to homogenize the foam. The homogenizing Cover layer 64 is a flat, round workpiece made of porous material with a free area of the pores from a total of 20 to 80% of the total cross-sectional area. The porosity of the for the cover layer 64 increases The material used depends on the desired fullness of the foam to be dispensed and the thickness of the Cover layer 64 from. The thickness of the cover layer 64 is preferably 0.013 to 12.7 mm, but also Thicknesses up to 38.1 mm can occur. A homogenizing cover layer 64 made of a porous Fiber material of the desired porosity and with a thickness of less than 0.13 mm can be effective serve to remove the foam generated in the mixing chamber 42 during its passage to the dispensing opening 26 to homogenize. The cover layer 64 is on the upper part 36 of the foam generator 30 on a Ring shoulder 66 arranged at the upper end of the ring part 40. On the inner peripheral surface of the Ring wall 52, a retaining ring 68 is attached in a suitable manner to the abutment of the cover layer 64 on the Ring shoulder 66 to ensure.

The total cross-sectional area required for the foam dispenser 10 to operate effectively the openings 58 is in a critical relationship to the free, inner cross-sectional area of the lower pipe part 38 and the viscosity of the foamable liquid 14 in the container 12. The usable Liquids 14 have viscosities between 0.005 and 3 dyn.sec / sq cm, but preferably between 0.005 and 0.5 dyn-sec / sqcm. If the viscosity of the liquid 14 used is within these limits, that is optimal ratio of the total cross-sectional area of the openings 58 to the free, inner cross-sectional area of the pipe part 38 approximately 0.75 to 5.0. the The surface tension of the liquid 14 should be 15 to 70 dyne / cm, preferably 20 to 50 dyne / cm. Liquids 14 with surface tensions in the lower range of the specified limits have better ones Spreading and wetting properties within porous materials and thus result in better ones Foam properties of liquids 14. In contrast, liquids 14 give their surface tensions are in the upper range of the specified limits, more stable foams when generating the Foam.

The usable foamable liquids 14 can comprise about 70 to 99.8% by weight of one Solvent and 0.02 to 30% by weight of a wetting agent consist, the wetting agent being a HLB number from about 7 to 40, and the solvent from about 70 to 100% by weight of water and up to consists of about 30% by weight of a co-solvent. The solvent is made from a group selected consisting of monohydric alcohols having 2 to 5 carbon atoms, glycol ethers, and mixtures. The wetting agent can be composed of organic anionic, nonionic, cationic or ampholytic compounds and mixtures thereof having an HLB number in the range from 7 to 40 can be selected. the HLB number is a semi-empirical term that is applied to many classes of wetting agents in order to achieve the To denote the ratio of hydrophobic and hydrophilic properties. See »CLUES TO SURFACTANT SELECTION OFFERED BY THE HLB SYSTEM «(key to the selection of wetting agents according to the HLB system) by W. C. Griffin, in the June 1956 edition of the OFFICIAL DIGEST OF THE FEDERA-TION OF PAINT AND VARNISCH PRODUCTION CLUBS.

Wetting agents are to be understood as meaning, for example, organic compounds such as triethanolamine, Sodium and / or chewing salts of coconut fatty acids, Oleyl fatty acids, etc .; Metal · and amine salts of alkyl sulfonic acids in which the alkyl group contains 7 to 18 carbon atoms; Metal and amine salts of long chain alkyl aryl sulfonates such as sodium dodecyl benzene sulfonate and potassium tetradecylbenzenesulfo-

nat; Alkyl sulfates, such as those produced by the sulfation of aliphatic alcohols having 6 to 20 carbon atoms are made with branched or unbranched alkyl chains, including sodium and potassium lauryl sulfate, Sodium and potassium hexadecyl sulfate, sodium and potassium octadecyl sulfate, etc .; Metal and amine salts of long chain alkyl sulfosuccinate esters such as octadecyl disodium sulfosuccinate; also alkali metal salts of sulfated ethylene oxides and / or condensation products of Propylenoxydeii. which by ethoxylation

tion and / or propoxylation (with subsequent sulfation) of various organic, hydrophobic Compounds are made that contain active hydrogen, such as alcohols, mercaptans, Phenols and amines; Sodium and potassium alkyl glycerol ethers, such as those obtained from tallow and coconut oil, e.g. B. Sodium coconut oil fatty acid monoglycerol sulfate, etc.; fatty alkanolamides, such as N-dodecylmonoethanolamide, N-octadecyldiethanol

amide and the like; Alcohol-alkylene oxide condensates (i.e. alcohols with 6 to 20 carbon atoms in straight or branched chain configuration with about 4 up to about 30 moles of ethylene oxide and / or propylene oxide per mole of alcohol in their molecules), alkylphenol-alkylene oxide condensates (i.e. those produced by the condensation of alkylphenol with an alkyl group containing about 6 to 20 carbon atoms in the chain, with about 4 to 30 or more moles of ethylene oxide and / or propylene oxide per mole of alkylphenol); and similar.

Nonionic wetting agents which can be used are, for example, compounds such as esters, which are obtained from 1 mole of polyhydric Alcohol with 2 to 6 hydroxyl groups and at least 1 mole of monobasic carbolic acid with 7 to 18 carbon atoms are formed in their structure, e.g. B. ethylene glycol monolaurate, glycerol monolaurate, Pentaerythritol monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan distearate, etc .; Ethylene oxide condensates of partially fatty ester acids of polyhydric alcohols of the aforementioned type; monohydric alcohols with 7 to 18 carbon atoms, ethylene oxide condensates of reactive hydrogen compounds having 7 or more carbon atoms in their structure, d. H. the long-chain fatty acids, such as Lauryl alcohol and stearyl alcohol, the long-chain fatty acids such as myristic acid and stearic acid, rosin acids, etc.

Cationic wetting agents which can be used are, for example, compounds such as quaternary ammonium salts with a long chain alkyl group such as cetylpyridine chloride, N-alkyltrimethylammonium chloride and lauryltrimethylammonium bromide; Amines such as laurylamine, stearylamine, rosinamine, N-dodecylethanol diamine and the like.

The use of anionic wetting agents is generally to be preferred. Alkyl aryl sulfonates are in particular and sulfates having 7 to 18 carbon atoms in their carbon chains are advantageous.

It is customary to use a foam stabilizer in a ratio of 0.002 to 15% by weight of the Foam stabilizer at 99.98% to 85% by weight of the solvent and the wetting agent together. Usable Foam stabilizers are, for example, organic compounds such as mono- and diethanolamides Fatty acids such as B. Laurikisopropanolamide, sodium carboxymethyl cellulose: Sodium hydroxyethyl cellulose, polyvinyl pyrollidone, hydrolyzed and partially hydrolyzed Polymers formed by the reaction of a lower alkylene such as ethylene, propylene and methyl vinyl ether with maleic and / or fumaric anhydride, e.g. B. ethylene maleic anhydride, propylene fumaric anhydride, methyl vinyl ether maleic anhydride, Polyvinyl alcohol, and the like are produced.

Of the foam stabilizers listed above, those with an HLB number from 1 to 12 preferred.

Sometimes it is advisable to add supporting ingredients, such as inorganic ones, to the wetting agent Salts added together in amounts up to 30% by weight of the solvent and the wetting agent can be. Inorganic sulfates, phosphate carbonate, phosphate borate and the like come into consideration. The most widely used inorganic salts are phosphate salts, which are commercially available Anhydride form as used by high temperature dehydration of orthophosphates as Tripolyphosphates from a mixture of disodium orthophosphate and monosodium orthophosphate; as Tetrasodium pyrophosphates from disodium orthophosphate; and orthophosphate as sodium polyphosphate glasses can be obtained. The various condensed phosphates can be used alone or in a mixture will.

Good results are obtained when tripolyphosphate is essentially the only condensed phosphate or with other condensed phosphates, e.g. B.

ίο tripolyphosphate and 20% pyrophosphate, is mixed. The properties of the foam, in particular the density, the moisture and the uniformity, which occur when the aforementioned foamable liquids 14 are used, depend to a considerable extent on the ratio of the amount of liquid 14 to the amount of air and on the extent to which it is used Depending on d <.: <: ,: '"i'""' ^r > ^ th mechanical mixing process the surfaces of the flüa". _b k ^': ''ut> A of the air come into contact with one another the quality of the foam, characterized by the density, cell size, the breakdown rate and the property of absorbing the fine filter paper. the U · ι. "".! 1 mainly influenced unc to the amount of air by the ratio of the amount of liquid 14 by The mechanical mixing process used. In general, the amount of air should be 10 to 100 ecm per gram of liquid which requires about 10 to 50 ecm of air per gram of liquid 14. On the other hand, to produce a drier foam, which can be used, for example, on harder foam. Surface is suitable, requires about 40 to 80 ecm of air per gram of liquid.

For purposes of explaining the use of the foam dispenser 10, it will be assumed that before use of the cover 22 by means of the thread on the outer peripheral surface of the ring wall 20 was tightened on the container 12. whereby a sealing abutment between the end face 54 and the annular surface 56 is given, and that the interior of the container 12 contains a quantity of foamable liquid 14 and contain a lot of air. In order to generate and dispense foam, the cover 22 is now in twisted the thread relative to the container 12, whereby between the spaced apart surfaces, the end surface 54 and the annular surface 56, a connection between i.'em foam generator 30 and the Dispensing opening 26 is produced. The shape-changeable container 12 is then hand-made in a known manner pressed together. Because of the limited size of the openings 58 only a limited amount of Air can flow from the interior of the container 12 into the mixing chamber 42, which has an effect increasing pressure of the air in the interior of the container 12 on the surface of the foamable Liquid 14 and causes liquid 14 to flow up through the pipe part 38, the ball of the Ball check valve 60 lifts and enters the mixing chamber 42. The through the openings 58 in the Mixing chamber 42 compressed limited amount of air mixes in the mixing chamber 42 to produce the Foam with the liquid 14 that has flown in through the pipe part 38 Container 12 is caused that the foam generated in the mixing chamber 42 by the homogenizing Cover layer 64 pressed, and through the dispensing opening

-j? *

10

30th

26 is issued. The foam is homogenized while it is pressed through the cover layer 64, so that the foam dispensed through the dispensing opening 26 has the desired properties uniformly having.

When the deformable container 12 is released, the ball of the ball check valve 60 resets on the upper conical surface 62, whereby a backflow from the mixing chamber 42 through the Pipe part 38 is prevented downwards. The sealing effect of the ball check valve 60 is the Liquid 14 is held in the interior of the hollow body 32. Upon letting go of the deformable container 12 simultaneously air flows in the opposite direction through the openings 58 and the opening 18 in the Interior of the shape-changeable container 12. Thereafter, the foam dispensing device 10 can through Squeeze the deformable container 12 - actuate again to add more foam generate and dispense this through the dispensing opening 26.

The second embodiment (FIG. 5) of the foam dispenser 10 is generally similar to FIG first embodiment (F i g. 1 to 4) and has a shape-changeable container 12, the contains a lot of foamable liquid 14 and a lot of air. The outer circumference of the ring wall 20 of the The container 12 is provided with a thread into which the corresponding thread of the lid 22 engages. The in Foam generator 70 disposed in the interior of the container 12 is at the upper end of the container 12 supported and fastened.

The foam generator 70 has a hanging hollow body 72, which preferably consists of a tube is made of a non-porous material of sufficient length so that the hollow body 72 is in The longitudinal direction of the container 12 extends down to the vicinity of the bottom 16 of the container 12. That The upper end of the hollow body 72 is received and fastened in an annular flange 74 of the foam generator 70, to the annular flange 74 in turn releasably attached to the upwardly directed annular collar 50 of the container 12 is attached.

The ring flange 74 of the foam generator 70 has on its upper side an annular wall 52 'with an inclined 'Upper end surface 54', which in turn cooperates with the likewise inclined annular surface 56 in the cover 22. When the annular surface 56 rests on the upper end surface 54 ', a sealing effect is created between the Lid 22 and the annular wall 52 ', while with a .Los Turning the lid 22 the sealing effect between the ring surface 56 and the end surface 54 'canceled and thereby a connection between the foam generator 70 and the dispensing opening 26 is made. The • ring flange 74 of the foam generator 70 consists of the flat annular flange 46 'and the sleeve 76 produced together with this in one piece, which the The upper end of the hollow body 72 is received and fastened. The foam generator 70 has an existing of several openings 78 air passage, the openings 78 in the Hollow bodies 72 are provided. The openings 78 are below the annular flange 74, which the sleeve 76 with includes, and above the foamable liquid 14, if this comprises the largest possible part of the interior of the container 12 occupies, arranged. On the top of the annular flange 74 of the foam generator 70 lies on a ring shoulder 66 'a homogenizing

50

60

65 cover layer 64, which is held in place by a retaining ring 68.

The second embodiment (Fig.5) of the foam dispenser 10 has a mixing chamber 80 which is located inside the hollow body 72 of the foam generator 70 lies between the openings 78 and the cover layer 64. The openings 78 connect the mixing chamber 80 through the opening 18 of the container 12 with the interior of the container 12, so that at a When the container 12 is compressed, air is forced into the mixing chamber 80.

For the purpose of using the second embodiment (FIG. 5) of the foam dispensing device 10, the Ceiling! 22 loosened by means of the thread, so that the annular surface 56 on the ceiling! 22 from end face 54 ' on the ring wall 52 'lifts off. This creates a connection between the foam generator 70 and the Dispensing opening 26 produced. Compression of the container 12 causes the cabbage to be inside 72 foamable liquid 14 flows upwardly into the mixing chamber 80 while at the same time air likewise flows into the mixing chamber 80 through the openings 78. The air and the foamable liquid il4 mix in the mixing chamber 80, whereby the Foam is generated which is pressed through the homogenizing cover layer 64 and then through the dispensing opening 26 is issued. When the container 12 is released, air flows through the openings 78 in In the opposite direction into the interior of the container 12, with which the foam dispensing device 10 is prepared for generating further foam by pressing the container 12 together again.

The third embodiment (FIG. 6) of the foam dispenser 86 also includes a shape changer Container 12 with an opening 18 which is defined by an annular wall 20. The peripheral surface of the The annular wall 20 is provided with a thread, by means of which the lid 22 can be detached from the container 12 is attached. In the interior of the container 12 there is the foam generator 88, the upper part 90 of which is supported and releasably attached to the upper end of the container 12. On the top 90 of the foam generator 88, the lower pipe part 38 is connected and fastened. The free cross-sectional area of the lower Pipe part 38 is connected to the mixing chamber 42 in the upper part 90 via the passage 44.

In the container 12 of the foam dispenser 86, a tight, shape-changeable bag 92 is arranged, which is tightly connected to the foam generator 88 and in which the lower pipe part 38 extends downwards extends. The upper end portion 94 of the bag 92 is sealingly over the flange 96 of the top 90 of the Foam generator 88 attached so that the bag 92 can be replaced or removed if necessary.

The use of a pouch 92 is appropriate if there is one in the foam dispenser 86 foamable liquid 14 should be used that is not exposed to air or another gas for a long time Contact. The bag 92 is used to hold the foamable liquid 14 and to Preventing contact between the liquid 14 and the gas, so that an impurity or Deterioration of the liquid 14 is avoided. Especially j when food or perfumes die Form foamable liquid 14, the use of a changeable bag 92 is recommended.

When using the shape-changeable bag 92 for receiving the foamable liquid 14, the

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Installation of a ball check valve 60 in the upper part 90 of the foam generator 88 also required, to prevent the ingress of gas through the lower pipe part 38 to the foamable liquid 14 when the lid 22 is unscrewed and the dispensing opening 26 is thereby connected to the mixing chamber 42. In addition, the ball check valve 60 serves in this case to the foamable liquid 14 in the Letting go of the container 12 to hold it in the lower tube part 38.

In use of the foam dispenser 86 causes compression of the shape-changeable Container 12 a corresponding compression of the shape-changeable bag 92, whereby the foamable Liquid 14 is pressed out of the bag 92 through the pipe part 38 upwards into the mixing chamber 42. At the same time, air or the other gas passes through the openings 58 from the interior of the container 12 «The mixing chamber 42, which is arranged in the upper part 90 of the foam generator 88. In the mixing chamber 42 the foamable liquid 14 is mixed with the air or the other gas and the foam generated, which is pressed through the homogenizing cover layer 64 and discharged through the discharge opening 26 will.

The fourth embodiment (FIG. 7) of the foam dispenser 100 has a shape-changeable one Container 12, onto which a lid 22 is detachably screwed, the sealing effect between the container 12 and the lid 22 can be optionally made and stored. The one in that Foam generator 102 arranged inside the container 12 is provided with a plurality of lower pipe parts 10b provided, which are made of a flexible, non-porous material such as polyethylene, and their free Cross-sectional areas via passages 108 with the mixing chamber 42 i ι the upper part 104 of the foam generator 102 related. The lower tube parts 106 are in the upper part 104 of the foam generator 102 added and fastened so that they hang down in the container 12 and with their lower ends up in the vicinity of the bottom 16 of the container 12 reach. Each of the lower tube parts 106 is of a tight, shape-changeable pouch 110 enclosed in the Near the upper end of the respective lower pipe part 106 is sealingly attached to this. the lower tube parts 106 hang accordingly in the shape-changeable bags 110 down, so that the Inside each bag 110 is connected to the mixing chamber 42. In the top 104 of the foam generator 102, a ball check valve 60 is arranged directly below the mixing chamber 42. The ball of the Ball check valve 60 comes on the conical surfaces 62, which i.n. the outlet openings of the passages 108 Surrounding the interior of the upper part 104, sealing to the plant. With the foam dispenser in an upright position 100 is this sealing abutment of the ball on the conical surfaces 62 by acting on the ball Caused by gravity.

The bags 110 can accommodate different foamable liquids 14 can be used. Multiple bags 110 are particularly useful if two or more foamable liquids 14 are to be processed into a foam, these foamable liquids Liquids 14, however, cannot remain in contact with one another for a long period of time, or are out for other reasons, mixing the various foamable liquids 14 prior to creating the Foam is not what you want.

In use of the foam dispenser 100, the container 12 is wildly compressed, to such an extent that the shape-changeable bags 110 are also compressed. This causes the foamable liquids 14 to flow upward in the lower tube parts 106. The foamable liquids 14 flowing upwards lift the ball of the ball check valve 60 from the conical surfaces 62 so that the liquids 14 enter the mixing chamber 42. At the same time, air is pressed from the interior of the container 12 through the openings 58 into the mixing chamber 42, where the foam is generated. The foam is then pressed by the homogenizing cover layer 64 and discharged through the discharge port 26, being provided of course that the lid 22 is rotated so that the connection between the \ mixing chamber 42 and the discharge port is free 26th

The fifth embodiment (Fig.8) of the foam dispenser 112 has a deformable container 12 onto which a lid 114 is threaded The foam generator 116 is arranged in the interior of the container 12. The Schaumabis Dispensing device 112 is also provided with a deformable air bag 118, which is arbitrarily hand can be compressed and used to blow air both into the lid 114 and into the interior of the Press in container 12.

The lid 114 has in the wall facing the upper end of the container 12 a sleeve 120 which an opening 121 forms in which the upper end of the hollow body 122 of the foam generator 116 is received and is attached. In the lid 114 a dispensing opening i24 is provided, which is through a Circular cylinder 126 is determined, which forms the upper part of the cover 114. In the direction of the current of the Foam in front of the dispensing opening 124 is arranged a homogenizing cover layer 128 which is held in place by a retaining ring 130. In the circular cylinder 126 there is also a circular disk 132 arranged, the interior of the circular cylinder 126 in a cylinder chamber 134 and in an air chamber 142 divided. The circular disk 132 is provided with a central hole 136 and by a retaining ring 138 held. The cylinder chamber 134 lies between the circular disk 132 and the cover layer 128 The cylinder chamber 134 opens out into the free cross-sectional area of the hollow body 122. Through the center hole 136

in this way, air originating from the airbag 118 is conveyed from the air chamber 142 into the cylinder chamber 134. The air chamber 142 is also in communication with the interior of the container 12 via an opening 140, whereby air originating from the airbag 118 from the air chamber 142 into the interior of the container 12 can be promoted.

The airbag 118 is via a connection 144 to the Air chamber 142 connected. The connection 144 is at the opposite of the dispensing opening 124 End of the circular cylinder 126 is provided. The airbag 118 in turn points to that of the connection 144 opposite end to an air inlet 146 which is provided with a closing valve 148 which is in the Inside the airbag 118 is located. Air from the surrounding atmosphere passes through air inlet 146 into the interior of the airbag 118. The function of the closing valve 148 is that the Entry of air through air inlet 146

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allows air to flow out through the air inlet when the air bag 118 is compressed 146 but is prevented.

The hollow body 122 points below the cover 114 Breakthroughs 147 that are still above the foamable liquid 14 when this is the largest possible Part of the interior of the container 12 occupies Four openings 147 are uniform over the circumference of the hollow body 122 arranged distributed; each opening 147 has a diameter of 1 mm, when the diameter of the free cross-sectional area of the hollow body 122 is 3.8 mm. In the hollow body 122 of the foam generator 116 is above the openings 147 up to the upper end of the Hollow body 122 reaching primary mixing chamber 149 is provided.

When the foam dispenser 112 is used, the air bag 118 is compressed, whereby '·>' - '- Xuft through the opening 140 into the interior of the - _; * V ^ container 12 is pressed. The pressure of the air in the container 12 acting on the foamable liquid 14 causes the liquid 14 to flow upwards into the hollow body 122. At the same time, V ¹ air is pressed through the openings 147 into the mixing chamber i, ' 149, where the foam is generated. From this -, 'primary mixing chamber 149, the foam is pressed into the V' .. cylinder chamber 134, which serves as a secondary mixing chamber. There, further air / is supplied to the foam introduced from the primary mixing chamber 145, which air flows through the center hole 136 from the. Air chamber 142 is pressed in. The foam is then pressed from the cylinder chamber 134 through the homogenizing cover layer 128 and discharged through the dispensing opening 124.

A foam control nozzle 150 (FIG. 9) can be attached to the end of the projection 2 & of the lid 22 in order to direct the foam dispensed through the dispensing opening 26 in a desired direction or to spread it in a selected pattern. The foam control nozzle 150 has a rear annular wall 152 which is pulled onto the end of the projection 24 of the cover 22. A retaining ring 154 on the outer peripheral surface of the projection 24 engages an annular recess in the inner peripheral surface of the annular wall 152, whereby the foam control nozzle 150 is held in place. In the foam control nozzle 150, several outlet openings 158 are provided in the desired arrangement, whereby the connection between the interior space 156 of the foam control nozzle 150 and the surrounding atmosphere is established. The boundary surfaces of the outlet openings 158 are arranged in the foam control nozzle 150 in such a way that the desired pattern and the desired direction in which the foam is dispensed is established, with the foam either being concentrated or spreading. If necessary, the foam control nozzle 150 can be produced in one piece together with the projection 24 of the cover 22, the outlet openings 158 being formed directly in this workpiece.

The sixth embodiment (FIGS. 10 and 11) of the foam dispensing device 10 differs from the first embodiment (FIGS. 1 to 4) only in the type of mounting of the homogenizing cover layer 64 ', which is movably mounted and as a valve for the flow of air when the foam dispenser 10 is in use. The cover layer 64 'consists of a material of the type described in connection with the first embodiment and has an outer circumference whose diameter is slightly smaller than the diameter of the inner circumferential surface of the annular wall 52 of the upper part 36 of the hollow body 32. The cover layer 64' is flat and is supported with its lower surface at a distance above the annular shoulder 66 at the upper end of the ring part 40 by bearing against four lugs 67 evenly distributed over the circumference, which are formed on the annular shoulder 66 so that the lower surface of the cover layer 64 'on the lugs 67 rests when the cover layer 64 'is in the lower end position. On the inner circumferential surface of the ring wall 52, an inner ring 69 is provided, the distance of which from the lugs 67 on the ring shoulder 66 is greater than the thickness of the cover layer 64 '. The inner diameter of the inner ring 69 is smaller than the outer diameter of the cover layer 64 ', so that the movement of the cover rail 64' is based on displacements ^ between the lugs 67 and the inner ring 69

^ ■ [is restricted.

When the container 12 is squeezed together, the cover layer 64 ′ is replaced by the layer in the mixing chamber 42 generated foam is lifted from the noses 67 on the annular shoulder 66 and moved upwards until the surface of the cover layer 64 'rests against the lower surface of the inner ring 69 with the edge of its surface the foam generated in the mixing chamber 42 is pressed through the cover layer 64 'and through the 'Dispensing opening 26 issued. When the deformable container 12 is released, the cover layer moves 64 'back down to the contact with the noses 67. Then air from the surrounding atmosphere can pass through the dispensing opening 26 and the central cavity 28 in the ceiling! 22 flow in and around the outer circumference of the cover layer 64 'around and between the lugs 67 through into the mixing chamber 42 and further into the Interior of the container 12 flow. In this way, the homogenizing cover layer 64 'optionally serves for homogenizing the foam generated in the mixing chamber 42, which is discharged through the dispensing opening 26 is issued, and for the inflow of air into the interior of the deformable container 12, which through the The discharge opening 26 flows in from the surrounding atmosphere. This embodiment of the cover layer 64 ' can also be used with the other embodiments of the foam dispensing device with appropriate adaptation 10,86,100 can be used.

The seventh embodiment (Fig. 12) of the foam dispenser 160 v / e is a shape changeable

Container 12 and a lid 22 which is releasably attached to container 12 by means of a thread. Of the The foam generator 168 of the foam dispenser 160 is movable within the shape changeable Container 12 arranged and serves during use of the foam dispenser 160 as Valve for introducing air into the interior of the container 12.

On the upper end of the container 12, an annular flange 162 is releasably attached to achieve a The sealing effect cooperates with the cover 22. Of the Ring flange 162 is attached with its flat part to the uppermost end of the container 12 and has a Rittgwand 164, which extends upwards and a inclined upper end surface 166 carries which in turn on the corresponding inclined annular surface 56 in the lid 22 can be brought to the plant in a sealing manner.

The foam generator 168 is arranged in the interior of the container 12 and has an upper part 170 and

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.'I

a lower pipe part 172. The pipe part 172 is in the added lower end of the upper part 170 and fastened. In the top 170 of the foam generator 168 a mixing chamber 42 is provided which is within a rigid ring part 176 made of non-porous material is formed. Four openings 174 are distributed uniformly over the circumference in the ring part 176 intended. The free cross-sectional area of the openings 174 is as in the first embodiment Foam dispenser 10 to choose.

The ring part 176 is produced in one piece with the support ring 178 provided at its upper end, where the support ring 178 lies in a plane parallel to the plane of the annular flange 162. The support ring 178 has an outer diameter that is greater than the diameter of the inner circumferential surface of the ring wall 164 of the annular flange 162. A homogenizing cover layer 180 is attached to the surface of the support ring 178, the outer diameter V of which is equal to the outer diameter of the support ring: s 178 . The cover layer 180 can consist of a material of the same type as the cover layer (A of the first embodiment of the foam dispensing device 10).

In the container 12 of the foam dispenser 160 are several radially inwardly directed Support members 182 are provided on the uppermost part of the container 12 formed by the annular collar 50, namely preferably four support members 182 evenly distributed over the circumference - Are arranged at such a distance below the uppermost end of the container i2 that the support ring 178 with the cover layer 180 attached can make a limited downward movement until the The lower surface of the support ring 178 comes to rest on the support members 182. Accordingly, they protrude Support members 182 radially inward to an extent sufficient for this purpose. The distance of the Support members 182 from the top of the container 12 is greater than the sum of the thicknesses of the support ring '178 and the cover layer 180, so that a movement of the foam generator 168 in the direction of the longitudinal axis of the Container 12 between the two end positions is possible. The upper end position is determined by the system ^ Surface of the cover layer 180 determined on the lower surface of the annular flange 162, while the lower The end position is determined by the contact of the lower surface of the support ring 178 on the support members 182.

In the container 12, a compression spring 184 is provided, which an upward pressure on exerts the foam generator 168 so that the surface of the cover layer 180 on the lower surface of the annular flange 162 comes to the plant. The compression spring 184 surrounds a guide pin 186 which is located on the 3oden 16 of the container 12 is arranged. The compression spring 184 rests with one end on the bottom 16 of the Container 12 and acts with its other end against the lower end of the pipe part 172, The Guide pin 186 can be made integral with the bottom 16 of the container 12 or on the bottom 16 be attached. The length of the guide pin 186 is dimensioned so that the lower end of the tubular part 172 at is guided by the guide pin 186 in each position of the foam generator 168. The cross section of the Guide pin 186 is kept so small that by the remaining free part of the inner cross-sectional area of the Pipe part 172 always foamable liquid 14 in sufficient quantity from below into the foam generator 168 can flow in. The length of the compression spring 184 can be chosen so that when fully compressed Compression spring 184 the movement of the foam generator 168 downwards precisely in the position by the compression spring 184 itself is limited, the required distance between the surface of the cover layer 180 and corresponds to the lower surface of the annular flange 162. With such a choice of the length of the compression spring 184, which limits the downward movement of the support ring 178 itself, the support members 182 can be omitted.

be to sen.

During operation of the foam dispenser 160, by compressing the deformable Container 12 of foamable liquid 14 through the lower pipe part 172 of the foam generator 168 after pushed up into the mixing chamber 42 in the upper part 170, wherein the liquid 14 on the exit the passage 44, the ball of Kugelrückschlagven tiles 60 raises. At the same time, air is released from the interior of the container 12 is pressed through the openings 174 into the mixing chamber 42, where the air! with the Liquid 14 is mixed and the foam is generated. While the container 12 is being compressed the pressure of the air in the interior of the container 12 acts on the lower surface of the support ring 178 and supports it thus the force of the compression spring 184 to move the surface of the cover layer 180 against the lower surface of the To press annular flange 162, creating a sealing effect and a flow of air or Liquid 14 between the support ring 178 and the annular flange 162 is prevented.

By unscrewing the cover 22 by means of the thread, between the annular surface 56 and the End face 166 through a connection between the dispensing opening 26 in the lid 22 and the Interior of the container 12 created so that the foam generated in the mixing chamber 42 by the homogenizing cover layer 180 can flow to the discharge opening 26. When you let go of the shape-variable container 12, the ball of the ball check valve 60 is again sealingly on the Conical surface 62 under the mixing chamber 42, causing a flow of air or foam downwards prevented by the pipe part 172 and the liquid 14 is held in the pipe part 172. When letting go of the shape-changeable container 12, the pressure of the air in its interior is reduced below that in the surrounding atmosphere prevailing pressure. Consequently acts on the support ring 178 with the attached thereon Cover layer 180 exerts a higher pressure from above than from below, resulting in a pressure exerted on foam generator 168 acting, downward force results, which moves the foam generator 168 downward until the Lower surface of the support ring 178 on the Stlitzg handles 182 comes to the plant. As soon as the surface of the cover layer 180 is removed from the lower surface of the annular flange 162 has dissolved, air flows from the dispensing opening 26, through the lid 22 and around the outer periphery of the Cover layer 180 and the support ring 178 around into the interior of the container 12. The spring force of the Compression spring 184 must be chosen so that the compression spring 184 although the foam generator 168 up to Move the top of the cover layer 180 up against the underside of the annular flange 162 can, but when releasing the shape-changeable container 12 due to the different pressures resulting downward force is sufficient to increase the spring force of the compression spring 184 overcome. The foam generator 168 that is movable in this way

22 23 5βΟ

thus acts as a valve for the inflow of air into the interior of the container 12 when the is released shape-changeable container 12 to the amount of air located in the interior of the container 12 and to prepare for the renewed generation and dispensing of foam.

As schäumbat-e liquids 14 can also be used in the further Ausührungsformen (Fig.5 to 12) of the Foam dispensing device according to the invention those used, which are mentioned in connection with the first embodiment (Figs. 1 to 4) *

For this purpose 4 sheets of drawings

Claims (23)

Patent claims: 1. Device for dispensing foam, which is generated by mixing a foamable liquid with air, containing a container partially filled with the ο liquid and partially with air, which has a deformable wall for the purpose of increasing its internal pressure, and a cap is closed, wherein a foam generator in the form of an elongated hollow body extends from the region of the cap through the air space of the container into its liquid space and is connected at its upper end to a foam outlet channel arranged in the cap, characterized in that the foam generator (30, 70, 88, 102, 116, 168) is a non-porous hollow body which has a tube part (38, 106, 172) which is axially open at its lower end and which has a mixing chamber (42, 42, 80 ί'149), into which at least one passage opening (58, 78, i47, 174) connected to the air space opens, the total cross-sectional areas of all air passage openings being smaller than the inner cross-sectional area of the hollow body. 2. Apparatus according to claim I, characterized in that a foam homogenizing and made of a porous material with a free area of the pores of a total of 20 to 80% of the total cross-sectional area existing cover layer (64, 128,180) in the line for the foam between the Mixing chamber (42, 80, 149) and the dispensing opening (26, 124) is provided. 3. Device according to one of the preceding Ji claims, characterized in that the hollow body (32) is provided with at least one valve (ball check valve 60) , which allows a backflow of liquid (14) or foam from the mixing chamber (42) into the of the part of the interior of the container (12) occupied by the liquid (14) is prevented. 4. Device according to one of the preceding claims, characterized in that the foam generator (168) is movably mounted in the container (12) and serves as a valve for the supply of air to the interior of the container (12) when the pressure of the air in the container (12) is lower than outside. 5. Device according to one of the preceding claims, characterized in that the means enabling the pressure of the air in the container (J2) to be increased are formed by a deformable air bag (118) which is in communication with the interior of the container (12) . 6. Apparatus according to claim 5, characterized in that the deformable airbag (118) is in communication with a cylinder chamber (134) which in turn communicates on the one hand with the mixing chamber (149) and on the other hand with the discharge opening (124) and which is connected to the It is used to add further air from the airbag (118) to the foam supplied from the mixing chamber (149). 7. Device according to one of the preceding claims, characterized in that in the interior of the container (12) at least one the liquid (14) receiving, variable shape bag (92, 110) is provided, which sealingly on the> hollow body of the foam generator (88, 102) is connected so that the interior of the bag (92, 110) is in communication with the mixing chamber (42). 8. Device according to one of the preceding claims, characterized in that the lower tubular part (38, 106, 172) of the hollow body (32, 72, 122) has an inner diameter of 0.8 to 12.7 mm. 9. Device according to one of the preceding claims, characterized in that the lower tubular part (38, 106, 172) of the hollow body ( 32, 72, 122) has an inner diameter of 1.6 to 6.4 mm. 10. Device according to one of the preceding claims, characterized in that the cross-cutting surface of each opening (58, 78, 147, 174) of the air passage (34) is 0.645 to 6.45 square mm 11. Device according to one of the preceding Claims, characterized in that the lower , jJRohrteil (38, 106, 172) of the hollow body (32, 72, 122) has a fine inner diameter of 3.8 mm and lyier openings (58, 78, 147, 174) with a diameter of 1 mm each are provided. 12. Device according to one of claims 1 to 9. characterized in that the air passage (34) . Is formed by the pores of a porous wall part in the ^ upper part (36, 90, 104, 170) of the hollow body (32, 72, {122) and that the porous wall part has four to forty pores per linear cm and an air resistance - measured as Pressure drop of the air in mm of water column on passage ^r through the 12.7 mm thick, porous material at a speed of 106.68 m per minute - from 1.14 to 25.4 mm of water column. 13. Device according to one of the preceding claims, characterized in that the dispensing opening (26) is arranged in a cover (22) which cooperates with sealing means (end surface 54, 54 ', 166, annular surface 56, 56') which are used to interrupt the connection between the mixing chamber (42, 80) and the dispensing opening (26) can be actuated. 14. The device according to claim 1, characterized in that the container (12) consists of a deformable material and its interior is in communication via an opening (18) with the dispensing opening (26, 124), which in turn is in a on the container (12) seated cover (22, 114) is formed, and that the air passage (34) in the hollow body (32, 72, 122) is formed in an area above the liquid (14). 15. The device according to claim 14, characterized in that the hollow body (72, 122) has an upper part arranged in the opening (18) of the container (12) and a downwardly hanging part in the liquid (14) approximately in the longitudinal direction of the container (12) ) has submerged lower pipe part and that the air passage (openings 78, 147) is provided in the pipe part between the upper end and the liquid (14). 16. The device according to claim 14, characterized in that the hollow body (32) has a lower tubular part (38, 106, i72) immersed in the liquid (14) and an upper part (36, 90, 104, 170) , the ring part (40, 176) delimits the mixing chamber (42) and the air passage (34) between the mixing chamber (42) and the part of the interior of the container (12) occupied by the air contains, so that a compression of the formver-Hnderlxhen Container (12) the introduction of liquid (14) through the lower pipe part (38, 106, j 72) upwards and the introduction of air through the air passage (34) into the mixing chamber (42) in the Manner causes foam to be generated therein. 17. The device according to claim 14, characterized in that in the upper part {36, 90, 104, 170) of the hollow body (32) at least one valve (ball check valve 60) is provided, which is a Flow of liquid (14) through the lower tube part (38,106,172) of the hollow body (32) upwards in the compression of the shape-changeable container (12) and allows a backflow of Liquid (14) prevented when the shape-changeable container (12) is released. 18. The device according to claim 14, characterized in that at least one closed shape-changeable bag (92, 110) in the container (12) is tightly connected to the hollow body (32) and thereby the interior of each bag (9 /, 110) with the mixing chamber ( 42) is connected and that each bag (92,110) contains liquid (14), which in the '' Compression of the container (12) through the ■ hollow body (32) upwards into the mixing chamber (42) flows and is mixed there with air. 19. The device according to claim 14, characterized in that the foam generator (168) is movably mounted in the container (12) and serves as a valve for the supply of air to the interior of the container (12) when the shape-changeable container (12) ) Jos is left.
- 20. The device according to claim 1, characterized in that the entire cross-sectional area the air passage (34) formed by at least one opening (58, 78, 147, 174) to the mixing chamber (42,80,149) to the free cross-sectional area of the hollow body (32, 72,122) such as 0.75 to 5.0 behaves. 21. Device according to one of the preceding claims, characterized in that the dimensions of the hollow body (32, 72, 122) and the air passage (34) in relation to one another so are chosen that the amount of air introduced into the mixing chamber (42, 80, 149) 10 to 100 ecm per Grams of liquid introduced (14). 22. Device according to one of the preceding claims, characterized in that the viscosity of the liquid (14) 0.005 to 3 dyn.sec / qcm and its surface tension 15 to 70 dyn / cm amounts to. 23. Device according to one of the preceding claims, characterized in that the liquid (14) a proportion of solvent and a proportion of wetting agent with an HLB number between 7 and 40 contains.