DE2263852A1 - AEROSOL SPRAYER - Google Patents

Description

Attorney file 23 272 Dec. 28, 1972

Case 2-7943 / 1 + 2 / GC 574

Aerosol atomizer

The invention relates to an aerosol atomizer for liquid products, with a piston pump for generating of compressed air serving as a propellant inside the atomizer.

Aerosol atomizers are known, which are used for the delivery of liquids in the form of a spray jet of compressed air use. For example, US Pat. No. 3,369,757 describes aerosol dispensers for liquid products with a container for the product to be atomized, one formed separately from the container, a piston and a cylinder having a pump for generating compressed air as a propellant, a spray nozzle in which it flows through Compressed air sucks the product out of the product container and from which she sprays it in the form of an aerosol,

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with flow paths for compressed air and product from the piston pump or from the product container to the spray nozzle and with the Shut-off devices assigned to flow paths for opening the same at a certain compression position of the piston in the cylinder of the piston pump.

These known atomizers suffer from the shortcoming that the timing of opening is spring-loaded Ball valve formed shut-off device for the passage of compressed air depends on the force of the valve spring and the pressure of the compressed air and is therefore subject to changes is when the properties of the spring material change over time. In addition, this valve must be uncontrolled Way before a valve controlling the product passage can open. This results in an inevitable Loss of compression.

In BE-PS 768 039 the applicant is an improved version of the aerosol atomizer described above explains in which the stated deficiency is eliminated by at least the one controlling the compressed air passage Valve by mechanical action of an actuation-transmitting stop arrangement on the piston pump towards one the valve belonging to the valve plate, valve stem or the like is opened, the stop arrangement on the Piston pump acts either in direct contact or via a lever arrangement on the valve disk or stem.

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In these known atomizers, the product container is connected directly to the spray nozzle and in the actuating position of the atomizer usually above the spray nozzle arranged. As a result, the entire amount of product is exposed to the suction effect each time the atomizer is actuated. To get a handy size atomizer, the product container must be quite small.

This also applies to another type of aerosol cereal atomizer from the applicant for liquid products. These atomizers have a container for a product to be atomized a piston pump designed separately from the product container for generating compressed air used as a propellant, a spray nozzle for sucking in and atomizing product from the product container by means of compressed air flowing through it, Flow paths or passages for compressed air and product from the piston pump or from the product container to the spray nozzle, the passages associated with valve housings and shut-off devices containing shut-off elements via movable shut-off elements to open the passages when the piston approaches its full compression position in the cylinder Piston pump or, when it is reached, a stop arrangement seated in the piston pump, which is in the full Compression position of the piston with direct actuation-transmitting contact at least on the shut-off member of the

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Acts shut-off device for the compressed air passage, and a holder for the spray nozzle. Here are the product container and the shut-off device for the product passage is attached to the holder. This is removable attached to the piston of the piston pump and forms a structural unit with the same. The piston is hollow and forms that Housing for the remaining parts of the shut-off device for the compressed air passage housed in it.

With aerosol atomizers of the types described above and the like, it can sometimes be difficult to get the product to exit the product container to the spray nozzle to be timed so that the exit is exactly at the same time as or just before the end of the passage of compressed air through the spray nozzle stops when the opening of the shut-off devices controlling the discharge of the product by direct actuation-transmitting touch of the same

takes place with the stop formations present on the shut-off element of the compressed air passage.

It is an important purpose of the invention to realize an aerosol atomizer of the last mentioned type, in which the amount of product available for each actuation process is limited in such a way that the discharge the same before the termination of the resignation of

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Compressed air from the piston pump stops via the spray nozzle, regardless of whether the valve controlling the outlet of the product is through one of the spray nozzles the side facing the resulting negative pressure or, as described above, by direct actuation-transmitting Touch is opened.

Another object of the invention is to provide an aerosol nebulizer of the type described above, which an enlarged product container which is arranged so that it does not detract from the bulk of the atomizer enlarged or obstructing its handling, as well as a product metering device between the product container and the product-sucking spray nozzle.

Finally, the invention aims to provide one Aerosol atomizer of the type described, in which the metering device and the product container are so arranged are that only a small amount of the product is made available for atomization by using the atomizer briefly inverts it upside down and then straightens it up again before use.

These purposes are achieved according to the invention by a Aerosol atomizer for liquid products with a piston pump for generating compressed air used as a propellant

inside the atomizer, which is a piston, a cylinder

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and has a compression space, a separately formed from the piston pump container for the to be atomized Product, a spray nozzle for sucking in and atomizing the product by means of compressed air flowing through the nozzle in the form of an aerosol, a compressed air passage arrangement extending from the piston pump to the spray nozzle, one provided in the passage arrangement, one movable shut-off member in a valve housing for closing the compressed air valve device having the passage arrangement and one of the compressed air passage arrangement separately formed product passage arrangement with product flow control devices present therein, the characterized in that at least the front part of the piston protruding into the cylinder is the valve housing the compressed air valve device forms that the compressed air passage arrangement through the piston runs that a product metering device is arranged in the product passage arrangement near the spray nozzle on the piston is that the product flow control device intervenes the dosing device and the spray nozzle is provided that the product container is a cylinder of the piston pump surrounding reservoir comprises, and that a product passage from this reservoir under seal opposite the air compression chamber in the cylinder runs through part of the piston to the metering device.

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The compressed air passage arrangement is preferably attached to the shut-off element and / or provided on the cylinder stop devices, by means of which the shut-off member at least the compressed air passage arrangement as the piston approaches to its end position in the cylinder or when it is reached under direct actuation-transmitting system is to be opened. In the particularly preferred embodiment of the invention, the stop device also comprises one Training for the direct actuation-transmitting system on the product shut-off device to open the same Simultaneously with or shortly before the release of the compressed air passage arrangement. Such a type of fence arrangement is in the German patent application

P 22 60 234.2 (attorney's file) of the applicant

described.

In preferred embodiments of an aerosol atomizer According to the invention, one or more of the following advantageous features can be present in each case.

(a) There is a suspension arranged in the cylinder on the face of the piston pointing into the cylinder and loads it to the outside of the cylinder.

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(b) In one wall of the cylinder there is a check valve for the intake of air into the cylinder Return stroke of the piston provided.

(c) The anchor devices have a fixed stop on the inside of the bottom in the cylinder of the piston pump and a projection on the shut-off element, which, as long as it is out of contact with the stop, over the end face facing the cylinder base of the piston can protrude.

(d) The compressed air shut-off device contains an im Housing formed valve seat and arranged in the housing, the shut-off member in contact with the valve seat onerous spring.

(e) The shut-off element of the product shut-off device is in loaded in the closed position and has a passage arrangement in an open end of the compressed air passing through the piston protruding stop formation, while the shut-off element of the compressed air shut-off device has a plunger which extends through the passage arrangement and which when opened of the shut-off element in the compressed air shut-off device by means of the stop devices in the piston pump to open the product flow arrangement comes into actuation transmission system on the stop formation of the product shut-off device.

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(f) The product shut-off device has a valve seat on which the shut-off element is in contact in the closed position, as well as an elastically deformable membrane which engages the shut-off element and loads it in contact with the valve seat, further details of the structure and the mode of operation of Preferred embodiments of the aerosol atomizer according to the invention emerge clearly from the drawings and / or the following description of the latter. ? In the. ^ Excercises' shows:
1 shows an axial section of a first embodiment of the aerosol atomizer according to the invention with the

individual parts in the non-actuated position, Fig. 2 shows an axial section of the upper part of the in Fig.

embodiment shown with the parts in FIG

actuated position,
3 shows an enlarged cross-section through the embodiments shown in FIG. 1 along the line

Line III-III,
4 shows an axial section of the upper part of an embodiment similar to that shown in FIG. 2 with a modified product shut-off device

in the non-actuated position and FIG. 5 shows an axial section of the embodiment according to FIG. 4 in the operating position.

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In the drawing, corresponding parts are denoted by the same reference numerals throughout. The atomizer has a piston pump with a cylinder 1, a piston 2 and a piston 2 and cylinder 1 from each other away loading spring 3, a product container outer jacket 4, a compressed air shut-off device 5, a Spray nozzle 6 seated in piston 2 and at the outer end opposite the end of the piston protruding into cylinder 1 2 a product metering device 7 and a product shut-off device 8th.

As can be seen in detail in FIGS. 1 and 2, the compressed air shut-off device 5 has a valve housing 10, which is formed by a protruding into the cylinder 1 part of the piston 2 with a reduced diameter. A passage 14 penetrating the piston 2 in the longitudinal direction opens, on the one hand, into an enlarged recess 13, which in turn opens out at the bottom of the valve housing 10. On the other hand, the passage 14 opens into a chamber 38 a, which is designed as a narrowed part of a bore 38 in the side wall of the piston 2.

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- · ιι -

The suction and spray nozzle 6 is designed as a Venturi nozzle insert 39 and inserted into the bore 38 in such a way that that there is an annular product feed chamber 37 around it. From the supply chamber 37 lead radial

Product passages 37a to a constriction 39a of the Venin Direction of flow

turi nozzle insert 39, which has a / converging chamber 39b, into which compressed air can be introduced via the chamber 38a, is connected to a diverging outlet chamber 39c, through which a product is sprayed out of the atomizer in the form of an aerosol. The passage 14 forms.eine Compressed air flow path from the valve housing 10 to the nozzle insert 39. At the lower end 10a of the valve housing 10 is via its bore 13 an elastic valve seat disc 34 interspersed with openings by means of a cover 35 attached. The cover 35 is threaded onto the tapered end piece 10a of the valve housing 10 with a thread 35a unscrewed. A poppet valve 15 arranged in the bore 13 is passed through a likewise in the bore 13 seated spring 23 in contact with the valve seat disk 34 is loaded.

The cylinder 1 is pushed onto the part of the piston 2 which forms the valve housing 10 and surrounds it a certain distance. On a base 11 extending transversely over the cylinder 1 there is a seat for actuation

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of the poppet valve serving stop pin 18 which extends inwardly in alignment with the central opening of the valve seat disc 34. The piston return spring 3 is inserted between a seat ring 12 surrounding the stop pin 18 on the one hand and the cover 35 holding the valve seat disk 34 on the other hand.

The bottom 11 of the cylinder 1 is penetrated by openings 33, which in a compression chamber 17 of the cylinder flow out. The openings 33 are covered by a flexible, annular sealing washer 36, which over the Stop pin 18 is pushed on and the individual openings are closed by means of a movable edge strip 36a holds, while the middle part 36b through the seat ring 12 around the stop pin 18 in contact with the bottom

11 is recorded.

The sealing washer 36 forms together with the seat ring

12 an inlet arrangement for the admission of air into the area between the base 11 and the end face of the piston 2 formed compression space 17 of the cylinder 1.

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Between the cylindrical inner wall surface of the Cylinder 1 and the cylindrical outer surface of the valve housing part 10 of the piston 2 is a first piston ring seal 20 arranged. It is preferably inserted into an annular groove 35a of the cover 35 and prevents this Escape of air from the compression chamber 17. From the bottom 11 of the cylinder 1 extends a hollow, cylindrical extension 9 downwards to an open end 9a.

A second piston sealing ring 21 is located between the wall of an upper part which is enlarged with respect to the valve housing part 10 22 of the cylinder 1 and the outer surface of the piston upper part are used. It is preferably an O-ring seal formed and inserted into an annular groove 2a surrounding the piston 22. One with a thread 37a on the The upper end of the cylinder 1 has a screwed cap 37 a central opening 19b, the diameter of which is slightly smaller than the outer diameter of the piston ring seal 21, so that the piston 2 cannot be completely pulled out of the cylinder 1.

The outer jacket 4 surrounding the cylinder 1 and its extension 9 forms a product container 16. The expanded Upper part 22 of the cylinder 1, which the valve

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tilgehäuseteil 10 of the piston freely surrounds and in its peripheral wall enlarged passages 22a for a in the container 16 has contained product is screwed into a thread 4 a formed at the upper end of the outer jacket 4. The passages 22a extend downward in the wall of the upper part 22 to its connection with the actual cylinder. They form a flow connection between that surrounding the valve housing part 10 Interior of the cylinder upper part 22 and the interior of the product container 16.

An annular bottom 4b of the outer jacket 4 extends over the open end 9a of the cylinder extension 9 and is sealed against this by means of an annular seal 25. It is from one to the interior of the hollow cylinder extension 9 open passage 26 penetrated.

A product passage 27 with a crescent-shaped cross section runs in the axial direction in the piston 2. It ends with its inner end at the upper part of the peripheral wall of the valve housing part 10 in the surrounding it Interior 22b of the upper cylinder part 22.

A metering vessel 28 is with its peripheral wall in a recess 28a is used, which is located in a above the product container 16 via the DUsen insert

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39 also extending upper end piece of the piston 2 is formed. The dosing vessel 28 is above by means of a closure device, for example one screwed onto the upper end of the piston 2 with a thread 29a Cap 29, closed. The wall of the dosing vessel 28 is penetrated by passages 28b, via which the interior space 30 of the cap 29 and thus the product passage 27 opening into it with the interior space of the dosing vessel are in flow connection. The recess 28a has a concave bottom 28c, from which a further product passage 31 through the upper part of the piston 2 extends through to the product feed chamber. At the bottom of the seated in the recess 28a Dosing vessel 28 is a product shut-off device 8, here in the form of a slot 32a penetrated by it Membrane 32 is provided.

In terms of shape and size, the product container 16 is suitable for receiving a fairly large amount of one atomizing product set up so that you operate the atomizer very often and only one at a time can atomize a small amount of the product. In contrast, the dosing vessel 28 is only small in size, but has a capacity so only a small amount of the product, about several times that, but preferably a little less than

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what is sprayed with the compressed air available for each actuation of the atomizer can be. The total capacity of the dosing vessel 28, the cap interior 29b and the product passage 27 is dimensioned so that even the largest possible The amount of compressed air flowing out of the product container 16 through the nozzle insert 39 is not itself a product can suck in. The compressed air flowing out through the nozzle insert 39 thus only sucks in at least part of the each product present in the dosing vessel 28. This means that there is no energy left to suck in the product is consumed all the way from the container 16 to the spray nozzle, the atomizer operates more efficiently and also more accurately. After actuating the atomizer several times, but preferably after actuating it once, the dosing vessel or the metering chamber 28 is refilled in the manner described below.

In the operational state, the parts of the atomizer assume the positions shown in FIG. 1. the Spring 3 keeps the cylinder 1 and the piston 2 pulled apart, and the inlet arrangement in the bottom 11 of the Cylinder 1 is unloaded. The dosing vessel 28 is filled with the product. Now you practice with your thumb and Index finger of one hand putting a pressure on the bottom 4b of the

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Product container 16 with the cylinder extension 9 and at the same time on the cap 29 to the piston 2 below Compression of the spring 3 to slide it into the cylinder 1. The while in the compression chamber 17 of the cylinder compressed air loads the edge strip 36a of the inlet seal 36 in abutment over the passages 33 so that no air can escape. The poppet valve 15 is held by the spring 23 on its seat and the piston ring seal 20 prevents the escape of compressed air from the compression space 17 along the gap between the cylinder 1 and the valve housing part 10 of the piston 2. As soon as the parts are as shown in FIG Reach position, the stop pin 18 protruding on the inside of the cylinder base 11 comes in System on the poppet valve 15 and lifts it off its seat 34. The compressed one then escapes Air through the passage arrangement formed from the recess 13 and the passage 14 and the nozzle insert 39. Due to the flow through the nozzle insert with the compressed air arises in the product passage 31 and below the concave bottom 28c of the recess a negative pressure, so that the membrane 32 is below. Opening of the slot 32a bulges downwards. Now only the product contained in the dosing vessel 28 is sucked in through the passage 31, entrained in the flow of compressed air and alj ^ i "

Aerosol expelled from the nozzle insert. No product is sucked in from the product container 16.

When the pressure exerted on the parts of the atomizer is released, the spring 3 pushes the cylinder 1 and the piston 2 apart again. The spring 23 immediately brings the poppet valve 15 back into position on its seat. Via the inlet arrangement, the negative pressure created in the compression chamber 17 of the cylinder 1 is compensated, and the parts finally assume the positions shown in FIG. 1 again. When actuated in this way , the dosing vessel 28 is preferably completely emptied. The atomizer is now turned upside down so that the product flows through the passage 27 into the dosing vessel 28 in order to refill it. So that the sprayer is ready for the next operation.

The arrangement of the upper cylinder part 22 around the valve housing part 10 of the piston 2 and its connection to the cylinder 1, of which it forms an extension, allow air to enter the product container and thus to compensate for the negative pressure that occurs when the product is sucked in forms. During the movement of the cylinder 1 along the valve housing part 10, which has a reduced diameter, towards the piston, the enlarged upper part 22 moves in opposite directions.

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over the valve housing part 10. As soon as the has moved the area of the upper part 22 containing the passages 22a over the piston ring seal 21, the passages 22a stand above the space between the wall of the upper part 22 and the outer surface of the piston 2 in flow connection with the free environment. This condition occurs with every actuation of the piston 2 for sucking in product. The suction therefore never takes place under overcoming a Negative pressure. Therefore, the product can also unhindered from the container 16 via the space 22b around the valve housing part 10 and the passage 27 formed flow path to the metering vessel 28 flow if you turn the atomizer upside down. The membrane 32 must have sufficient rigidity so that no product through the in the overhead position of the atomizer Slot 32a can emerge.

Since the valve housing 10 is part of the piston 2 guided in the cylinder 1, it is not necessary in the case of known atomizers existing need for a separately manufactured piston. This puts all parts of the atomizer in there Bushings and other hollow parts that are relatively easy to manufacture.

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The arrangement of the dosing vessel 28 between the product container 16 and the nozzle insert 39 is their effect is considerably improved, since they still rely on a fairly small amount of liquid extends. Nevertheless, the product container 16 is able to hold a sufficiently large amount of the product to give the atomizer a long service life.

In the embodiment according to FIGS. 4 and 5, the metering device 7 has a product shut-off device, which instead of the slotted membrane 32 is a flexible and not penetrated by openings has elastic bellows 40, the inner end of which engages the shaft end 41a of a poppet valve 41. In the closed position, the poppet valve 41 is in contact with a possibly with the Bellows 40 integral upper cylindrical wall part 42 and is through the cylindrical wall of the dosing vessel 28 held in the recess 28a at the upper end of the piston. The wall 42 is of a Passage 42a penetrates through which the part located below the valve disk 41 in the bellows 40 of the interior of the metering device via a passage 43 running in the upper part of the piston 2 the annular feed chamber 37 around the spray nozzle 39

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is in flow communication around. The poppet valve 15 of the compressed air shut-off device 5 carries on his the side facing the metering device 7 a longer plunger 44. This runs within the passage 14 and is provided with longitudinal grooves 44a to allow the compressed air to flow freely along the passage to ensure the nozzle insert 39.

The end 44b of the plunger 44 can be in permanent contact with the underside of the bellows 40, whereby the product shut-off device is then immediately also open when placing the poppet valve 15 on the stop pin 18 and lifting it would. However, there is preferably between the end 55b of the plunger 44 and the underside of the bellows 40 a small distance so that the product shut-off device only a short time, for example a fraction of a second, after lifting the poppet valve 15 opens from its seat 34 and thus the "product flowing in via the passage 43" immediately enters a full flow of compressed air is entrained through the constriction 39a of the nozzle insert 39. Flows namely, the product too early via the passage 43, there is a risk that it will then fall into the constriction 39a there is a larger drop of the product,

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so that the spray jet would initially have a higher product concentration than the one that emerges later Aerosol.

A particular advantage of the aerosol atomizer according to the invention lies in the fact that no excess product flows into the spray nozzle after an atomization process and remains in it, which can otherwise lead to decomposition and clogging of the nozzle. Provided the volume of the dosing vessel 28 and the compression chamber are matched to one another in such a way that after exhaustion of the product contained in the dosing vessel 28, further compressed air flows through the constriction 39a, then the remaining flow of compressed air cleans the nozzle of any remaining product and thus extends the nozzle useful life.

Another advantage of the embodiment according to FIG and 5 therein the valve housing part 10 is detachable via a thread 10b with the upper part 2b of the piston 2 tied together. As a result, the valve housing part, like the metering device 7 and the cover 29, can be Easily detach from the upper piston part 2b in order to replace this together with the spray nozzle located in it against a new one Replacing parts, while the more complex parts with the springs, valves, etc. contained therein

Reuse reserves.

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Claims (11)

Patent claims: Aerosol atomizer for liquid products, with a piston pump for generating compressed air serving as a propellant inside the atomizer, which has a piston, a cylinder and a compression chamber, with a container for the product to be atomized _t a spray nozzle for suction and separately from the piston pump Atomization of the product by means of compressed air flowing through the nozzle in the form of an aerosol, a compressed air passage arrangement extending from the piston pump to the spray nozzle, a shut-off element provided in the passage arrangement, a shut-off element movable in a valve housing to close the passage arrangement and a compressed air valve device which is separate from the compressed air passage arrangement Product passage arrangement with product flow control devices present therein, characterized in that at least the front part of the piston (2) protruding into the cylinder (1) is the valve housing (10) of the compressed air vent il shut-off device forms that the compressed air passage arrangement (14, 38) runs through the piston, that a product metering device (7) is arranged in the product passage arrangement (27, 28, 31) near the spray nozzle (39) on the piston, that the Product- 309827/0464 flow control device (32, 41, 42) between the metering device and the spray nozzle is provided that the product container (16) is a surrounding the cylinder of the piston pump Comprises reservoir and that a product passage (27) from this reservoir under sealing with respect to the Air compression chamber (17) in the cylinder runs through part (2b) of the piston to the metering device. 2. Aerosol atomizer according to claim 1, characterized in that the metering device (7) in the direction the relative movement of the piston (2) with respect to the cylinder (1) on one side and the product container (16) is arranged on the other side of the spray nozzle (39), so that product by turning the atomizer upside down from Product container can be transferred to the metering device. 3. Aerosol atomizer according to claim 1 or 2, characterized in that the product container (16) the Surrounds the valve housing part (10) of the piston (2) and, together with the cylinder (1), is rigidly connected to it in a movable manner is that the product container is sealed against the compression space (17) of the cylinder (1) Part of the interior (22b) in free flow connection and that the piston (2) sealingly and slidingly in the part (22) surrounding the relevant interior part of the cylinder is guided. 309827/0464 4. Aerosol atomizer according to at least one of claims 1 to 3, characterized in that between the product container (16) and the valve housing part (10) ″ of the piston (2) at least one air inlet (22a) for the Admission of air to the product container is provided at the end of the compression stroke of the piston. 5. aerosol atomizer according to at least one of claims 1 to 4, characterized in that the product container (16) at its upper end a valve housing part (10) of the piston (2) surrounding collar (4a) that between the collar and the valve housing part a sealing ring (21) is held in sliding contact and that the product passage running through the piston (27) inside the in flow connection with the product container standing interior part (22b) of the cylinder (1) opens out on the valve housing part. ι
t "' 6. Aerosol atomizer according to at least one of claims 1 to 5, characterized in that an extended Part (22) of the cylinder (1) has an interior (22b) surrounding the valve housing part (10) of the piston (2) delimits that at least one passage (22a) is formed in the wall of the widened part through the product passage (27 with the container (16) 309827/0464 Is flow connected, and that Jen expanded part during the compression stroke in such a way, compared to the Sealing ring (21) on the valve housing part (10) is displaceable so that the passage at the end of the compression stroke Extends over the sealing ring and the interior of the product container with the free environment connects. 7. aerosol atomizer according to at least one of claims 1 to 6, characterized in that between the compressed air valve device (5) and the cylinder (1) an actuating device is provided with a stop part (18) seated in the cylinder on the inside of an end wall (11) of the compression chamber (17), which in a position raised from the stop part from the end face facing the compression chamber of the cylinder of the piston (2) protrudes. i- 8. aerosol atomizer according to at least one of claims 1 to 7, characterized in that the compressed air valve device (5) a valve seat (34) and one which loads the valve member (15) in contact with the valve seat Has spring (23) within the valve housing (10). 309827/0464 9. Aerosol atomizer after at least one of the Claims 1 to 8, characterized in that a check valve arrangement in a wall (11) of the cylinder (1) (33, 36) for air inlet into the compression space (17) of the cylinder is provided during the return stroke of the piston (2). 10. Aerosol atomizer after at least one of the Claims 1 to 9, characterized in that the product flow control device (8) has a valve member (41) loaded in the closed position, which a stop part (41a) protruding into an open end of the compressed air passage (14) passing through the piston (2) and that the compressed air valve member (15) extends along the compressed air passage in contact with the stop part of the product valve member extending plunger (44) carries so that the product flow control device when actuated by the stop part (18) of the piston pump (1, 2) on the compressed air valve element (15) is opened. 11. Aerosol atomizer according to claim 10, characterized in that the product flow control device (8) a valve seat (42a) on which the valve member (41) is in contact in the closed position, as well as a 309827/0464 -'28 - has elastically deformable wall structure (42) which engages the product valve member and this loaded in contact with the valve seat. 309827/0464 L e r s e i t e