WO2012104701A1

WO2012104701A1 - Device for dispensing fluids or mixtures

Info

Publication number: WO2012104701A1
Application number: PCT/IB2012/000130
Authority: WO
Inventors: Evans Santagiuliana
Original assignee: Taplast S.P.A.
Priority date: 2011-01-31
Filing date: 2012-01-25
Publication date: 2012-08-09
Also published as: IT1404092B1; ITVI20110013A1; WO2012104701A9

Abstract

The present invention concerns a device for dispensing fluids (1; 100; 200; 300) comprising: a hollow body (2) defining a suction/compression chamber (3) for the fluid, to which a piston (5) is slidingly coupled, said piston being movable from a first rest position to a second operating position; a supporting element (20; 120) for the piston (5); elastic means (8; 108) suited to ensure that, once the fluid has been dispensed, the piston (5) returns from the operating position to the rest position. Said elastic means (8;108) comprise a first portion (31; 131) that counteracts the supporting element (20; 120) and a second portion (32; 132) that counteracts the piston (5) through a counteracting element (6; 106; 201). The invention also implements a system for dispensing a fluid comprising a container for the fluid.

Description

DEVICE FOR DISPENSING FLUIDS OR MIXTURES.

TECHNICAL FIELD OF THE INVENTION

The invention concerns a device for dispensing a fluid, suited to be applied to a container containing said fluid, particularly suited to dispense food substances, perfumes or detergents in general.

DESCRIPTION OF THE STATE OF THE ART

As already known, dispensing devices that are applied to the container of the product in question are widely used to dispense liquid or creamy products, like food substances, soaps, creams, detergents or perfumes.

Said devices substantially comprise a cap provided with means for connection to the neck of the container and a hollow body defining a fluid suction/compression chamber, also called "accumulation chamber", to which a piston is slidingly coupled.

The piston comprises a plunger and a rod, provided with an actuator element, also called spout or nozzle, that can be operated by the user.

In order to dispense a dose of the fluid contained in the device, the user pushes the actuator element, and thus the piston, starting from an initial rest position of the same and reaching a second final operating position.

During the pushing stage, the fluid dose flows out through a suitable duct associated with the nozzle.

Once the fluid has been dispensed, the operator releases the actuator element that, together with the piston, automatically returns to the initial rest position.

In order to allow said automatic return movement, the device is advantageously provided with elastic means associated with the piston and with the actuator element, which are compressed and loaded by the operator during the pushing stage and that exert a thrusting and decompression action on the piston when the operator releases the actuator.

In a first type of known devices, the elastic means are constituted by helical springs that, as already explained, exert a thrusting and decompression action on the piston when the operator releases the actuator.

In another type of known devices, the elastic means are constituted by bellows elements.

A first drawback of the solutions described above lies in the complex construction structure of the devices.

A further drawback is represented by the fact that the dispensing devices using helical springs and the devices using instead bellows elements are different from each other from a construction point of view and their construction thus requires two distinct processes.

The object of the present invention is to overcome the drawbacks described above.

In particular, it is a first object of the invention to provide a device for dispensing fluids that is less difficult to construct compared to the devices of known type. It is another object of the invention to provide a device for dispensing fluids that is more flexible than the devices of known type, meaning a device constructed so as to allow the alternative use of elastic means of different types.

In particular, it is one object of the invention to provide a device for dispensing fluids constructed in such a way as to allow the alternative use of helical springs and bellows elements.

SUMMARY OF THE PRESENT INVENTION

The present invention is based on the general consideration that it is desirable to provide a device for dispensing fluids through the use of elements arranged suitably in order to configure the device so that during its assembly different types of elastic means can be used.

According to a first embodiment, the subject of the present invention is a device for dispensing fluids according to claim 1 , that is, a device for dispensing fluids comprising:

- at least one hollow body defining at least one suction/compression chamber for said fluid, to which at least one piston is slidingly coupled, said piston being movable from at least one first rest position to at least one second operating position;

- at least one supporting element for said at least one piston;

- elastic means suited to ensure that, once the fluid has been dispensed, said at least one piston returns from said at least one operating position to said at least one rest position,

wherein said elastic means comprise a first portion that counteracts said at least one supporting element and a second portion that counteracts said at least one piston by means of a counteracting element.

Advantageously, the counteracting element is interposed between the piston and the supporting element.

The supporting element preferably comprises a first ring nut suited to support and guide the piston and a second ring nut externally associated with the first ring nut.

According to a preferred embodiment of the invention, the first portion of the elastic means counteracts the first ring nut.

According to another preferred embodiment of the invention, the first portion of the elastic means counteracts the second ring nut.

According to a preferred embodiment of the invention, the elastic means comprise a helical spring.

According to another preferred embodiment of the invention, the elastic means comprise a bellows element.

Advantageously, the counteracting element is integral with the piston in the movements between the first rest position and the second operating position.

The counteracting element suitably comprises an actuator element that is integral with the piston, in order to allow the device to be operated.

In this case, advantageously, the second portion of the elastic means counteracts the actuator.

According to a preferred embodiment of the invention, the counteracting element comprises a stop element that can be associated with the piston.

The counteracting element is preferably suited to be removably associated with the piston.

Advantageously, the stop element comprises a snap ring that is integral with the piston.

Preferably, the first ring nut and the second ring nut are removably connected to each other.

Advantageously, the device comprises connection means suited to removably connect the first ring nut and the second ring nut.

According to a preferred embodiment of the invention, the connection means comprise a seat created in the first or in the second ring nut and a counteracting element created in the second or in the first ring nut and suited to be housed in said seat.

According to another preferred embodiment of the invention, the connection means comprise at least one threaded area created in the first ring nut and a nut screw provided in the second ring nut.

The second ring nut suitably comprises connection means for connection to a container. The first portion or the second portion of the elastic means is preferably an end portion.

The second ring nut suitably comprises at least one seat suited to house the first portion of the elastic means.

The second ring nut advantageously comprises at least one collar-shaped portion internally suited to house the first portion of the elastic means.

The elastic means are preferably made of a non metallic material.

The piston preferably comprises a supporting element to which a piston body is slidingly coupled, said piston body tightly cooperating with the walls of the suction/compression chamber.

The device advantageously comprises a rod connected to the supporting element.

The supporting element and the rod are preferably provided with a fluid dispensing duct that communicates with the suction/compression chamber and with the external environment.

The device properly comprises also first and second valve means suited to regulate the flow of the fluid into the suction/compression chamber and its outflow from the chamber into at least one dispensing duct.

Advantageously, the first valve means and the second valve means are respectively arranged downstream and upstream of a suction duct of the dispensing duct.

The first valve means preferably comprise a ball.

The second valve means preferably comprise sealing edges belonging to the piston.

Advantageously, all the parts making up the device are made of a plastic material.

According to a second aspect of the present invention, its subject includes also a system carried out according to claim 15, meaning a system for dispensing a fluid comprising a container for said fluid and a device for dispensing said fluid, wherein said device is carried out according to the description provided above.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages, objects and characteristics, as well as further embodiments of the present invention are defined in the claims and will be illustrated in the following description, with reference to the enclosed drawings; in the drawings, corresponding or equivalent characteristics and/or components are identified by the same reference numbers. In particular: - Figure 1 shows a partial longitudinal cross section of an example of a device for dispensing fluids that is the subject of the invention;

- Figure 2 shows an exploded view of Figure 1 ;

- Figure 3 shows a first variant embodiment of Figure 1 ;

- Figure 4 shows an exploded view of Figure 3;

- Figure 5 shows a second variant embodiment of Figure 1 ;

- Figure 6 shows an exploded view of Figure 5;

- Figure 7 shows an exploded view of another variant embodiment of the device of the invention;

- Figure 8 shows the device of Figure 7 assembled according to a first assembly condition;

- Figure 9 shows the device of Figure 7 assembled according to another assembly condition.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The examples of embodiment of the invention described below refer to a device for dispensing fluids and in particular for dispensing detergent liquids. It is clear that the solution proposed can be applied also to devices for dispensing perfumes or food products, or any other fluid in general that must be drawn from a container and conveyed towards the outside.

An embodiment of a device 1 for dispensing fluids according to the present invention, suited to be applied to the neck of a container containing a fluid to be dispensed, is shown in Figure 1.

It comprises a hollow body 2 that defines a suction/compression chamber 3 for a fluid, provided with a suction duct 4 for the fluid, to which a piston 5 is slidingly coupled, said piston being movable from a first rest position, visible in Figure 1, to at least one second operating position, not shown in the figures.

The dispensing device 1 can be operated by the user through an actuator element 6 comprising an operating button called also spout or nozzle 7, which is integral with the piston 5. Pushing the actuator element 6 to dispense a dose of the fluid, the user brings the piston 5 to the second operating position.

Elastic means, indicated as a whole by 8, are suited to guarantee the return of the piston 5 from the operating position to the rest position once the fluid has been dispensed.

As regards the piston 5, it comprises a supporting element 5a to which a plunger 5b is slidingly coupled, said plunger 5b tightly cooperating with the walls of the suction/compression chamber 3.

The supporting element 5a is coupled through interference with a rod 12 integral with the actuator element 6.

The supporting element 5a and the rod 12 are provided with a dispensing duct 13 for the fluid that communicates with the suction/compression chamber 3 and with the external environment E.

The hollow body 2 is integral with a supporting element 20 comprising a first ring nut 21 that supports and guides the piston 5 and a second ring nut 22, or cap, coupled with the first ring nut 21.

The first and second ring nuts 21 and 22 are coupled with each other through suitable connection means 23 comprising an outer annular edge 24 suited to define an undercut seat 25 belonging to the first ring nut 21, visible in Figure 2, and an inner annular edge 26 belonging to the second ring nut 22. The inner annular edge 26 of the second ring nut 22 is suitably housed in the undercut seat 25 provided in the first ring nut 21.

The connection means 23 allow the removable coupling between the first ring nut 21 and the second ring nut 22 to be carried out.

The outer annular edge 24 of the first ring nut 21 comprises an inclined surface portion 27 suited to favour the sliding movement of the inner annular edge 26 of the second ring nut 22 when the latter is coupled with the first ring nut 21.

According to variant embodiments of the invention, the connection means for the removable coupling between the first ring nut 21 and the second ring nut 22 may be carried out in a different way. For example, the undercut seat may be created in the second ring nut 22 and an annular edge suited to be housed in said undercut seat may be created in the first ring nut. Alternatively, the connection means may comprise an external thread obtained in the first ring nut and a corresponding nut screw provided in the second ring nut in order to allow the two ring nuts to be screwed on each other.

The second ring nut 22 is suited to be applied to the neck of the container where the fluid to be dispensed is contained, not illustrated in the figures. For this reason, the second ring nut 22 of the dispensing device 1 essentially serves the function of a cap.

For this purpose, suitable connection means 28, which in the embodiment illustrated herein comprise an inner thread 28a, allow the dispensing device 1 to be applied to the container. It is evident that in variant embodiments of the invention the second ring nut 22 may be provided with different connection means, according for example to the type of container used, like for example snap-fitting means or even glueing means.

According to the invention, the elastic means 8 comprise an elastic element that exerts a thrusting action between the supporting element 20 and the piston 5 through a counteracting element constituted by the actuator element 6.

Preferably, as shown in Figure 1, the elastic element is constituted by a helical spring 30 with several turns.

A first end portion 31 of the helical spring 30 is arranged so that it stops against the first ring nut 21. More particularly, it stops against the outer annular edge 24 of the first ring nut 21.

A second end portion 32 of the helical spring 30, opposite the first one 31, stops against the actuator element 6. More particularly, it is housed in a cylindrical annular seat 6a created in the actuator element 6.

In this way the spring 30 is maintained guided during its compression and is protected from the outside. This furthermore grants a better appearance to the device 1, as the spring is not exposed and therefore not visible. For the same reason, the second ring nut 22 is provided with a cylindrical collar 40 at the top, which extends until partially covering the actuator element 6.

First valve means 14 arranged downstream of the suction duct 4 and second valve means 15 arranged upstream of the dispensing duct 13 regulate the flow of the fluid from the container to the suction/compression chamber 3 and its outflow from the chamber 3 to the dispensing duct 13.

In the example of embodiment represented, the first valve means 14 comprise a ball 14a in a non metallic material, while the second valve means 15 are constituted by sealing edges 15a belonging to the plunger 5b, suited to cooperate with the walls of the suction/compression chamber 3 and suited to be engaged in corresponding grooves obtained in the first ring nut 21.

With reference now to Figure 2, it can be seen that the construction steps of the dispensing device 1 include the pre-assembly of the elements that make up the central unit, indicated as a whole by 50 in the figure, comprising in particular the first ring nut 21. Successively, the second ring nut 22 is connected to the central unit 50 by connecting it to the first ring nut 21 by snap-fitting its inner annular edge 26 in the undercut seat 25 provided in the first ring nut 21. The helical spring 30 is then fitted outside the rod 12 of the piston 5 and arranged so that its first end portion 31 at the top stops against the outer annular edge 24 of the first ring nut 21. Successively, the actuator element 6 is connected at the top of the rod 12, acting on the helical spring 30 with a suitable slight compression in order to allow it to be assembled with a slight pre-load.

According to the above, the actuator element 6 is integral with the piston 5, and more particularly with the rod 12. The term "integral" means that the actuator element 6 moves together with the piston 5 when the latter is operated and/or released. It is evident that the actuator element 6 can move in other directions, for example it can rotate around the rod 12, still serving its function as stop element for the second end portion 32 of the helical spring 30.

Regarding the operation of the device 1 of the invention, in practice the user acts on the actuator element 6 exerting a pressure P that moves the piston 5 axially. In this way the user loads the elastic means 8 and compresses the fluid contained in the suction/compression chamber 3.

The increase in pressure makes the plunger 5b slide on the supporting element 5a, thus ensuring the flow of the fluid contained in the suction/compression chamber 3 first towards the dispensing duct 13 and then towards the outside E. Once the plunger 5b has reached the bottom of the suction/compression chamber 3, it is released by the user, thus allowing the elastic means 8 to bring it back to its initial rest position shown in Figure 1.

The elastic return of the piston 5 generates a vacuum inside the suction/compression chamber 3 and said vacuum causes the operation of the first valve means 14 downstream of the suction duct 4 and makes the fluid flow into the chamber itself, by sucking it from the container and preparing the device 1 for the successive use.

A variant embodiment of the dispensing device of the invention, indicated as a whole by 100, is shown in Figure 3.

It comprises a hollow body 2 that defines a suction/compression chamber 3 for a fluid, provided with a suction duct 4 for the fluid, to which a piston 5 is slidingly coupled, said piston being movable from a first rest position, visible in Figure 3, to at least one second operating position.

The device 100 can be operated by the user through an actuator element 106, comprising an operating button called also spout or nozzle 107, which is integral with the piston 5. Pushing the actuator element 106 to dispense a dose of the fluid, the user brings the piston 5 to the second operating position.

Elastic means, indicated as a whole by 108, are suited to guarantee the return of the piston 5 from the operating position to the rest position once the fluid has been dispensed.

The supporting element 5a is coupled through interference with a rod 12 integral with the actuator element 106.

The hollow body 2 is integral with a supporting element 120 comprising a first ring nut 21 that supports and guides the piston 5 and a second ring nut 122, or cap, coupled with the first ring nut 21.

The first and second ring nuts 21 and 122 are coupled with each other through suitable connection means 123 comprising an outer annular edge 24 suited to define an undercut seat 25 belonging to the first ring nut 21 and an inner annular edge 126 belonging to the second ring nut 122. The inner annular edge 126 of the second ring nut 122 is suitably housed in the undercut seat 25 provided in the first ring nut 21.

The connection means 123 allow the removable coupling between the first ring nut 21 and the second ring nut 122 to be carried out.

The outer annular edge 24 of the first ring nut 21 comprises an inclined surface portion 27 suited to favour the sliding movement of the inner annular edge 126 of the second ring nut 122 when the latter is coupled with the first ring nut 21.

The second ring nut 122 is suited to be applied to the neck of the container where the fluid to be dispensed is contained, not illustrated in the figures. For this reason, the second ring nut 122 of the dispensing device 100 essentially serves the function of a cap.

For this purpose, suitable connection means 128, which in the embodiment illustrated herein comprise an inner thread 128a, allow the dispensing device 100 to be applied to the container.

According to the invention, the elastic means 108 comprise an elastic element that exerts a thrusting action between the supporting element 120 and the piston 5 through a counteracting element constituted by the actuator element 106.

Preferably, as shown in Figure 3, the elastic element is constituted by a bellows elastic element 130.

The bellows element 130 has its outer surface shaped as a spiral and essentially tends to assume the shape of a truncated cone.

A first end portion 131 of the bellows element 130 is arranged so that it stops against the second ring nut 122. More particularly, the annular edge 131a of the first end portion 131 is arranged so that it stops against and rests in a corresponding annular housing seat 122a obtained peripherally on the upper surface of the second ring nut 122.

A second end portion 132 of the bellows element 130, opposite the first one 131 , is arranged so that it stops against the actuator element 106. More particularly, it stops against the lower surface 107a of the spout 107.

Advantageously, the annular edge 131a of the first end portion 131 of the bellows element 130 rests in a stable manner on the annular housing seat 122a of the second ring nut 122, the supporting circumference being wide.

Furthermore, the bellows element 130 is tight and the construction of the second ring nut 122 and of the actuator is simplified compared to the solution described with reference to Figure 1.

With reference now to Figure 4, it can be seen that the construction steps of the dispensing device 100 include the pre-assembly of the elements that make up the central unit, indicated as a whole by 50 in the figure, comprising in particular the first ring nut 21.

Successively, the second ring nut 122 is connected to the central unit 50 by connecting it to the first ring nut 21 by snap-fitting its inner annular edge 126 in the undercut seat 25 provided in the first ring nut 21. The bellows element 130 is thus connected to the second ring nut 122 by arranging the annular edge 131a of its first end portion 131 on the annular housing seat 122a provided in the second ring nut 122.

Successively, the actuator element 106 is connected at the top of the rod 12, acting on the bellows element 30 with a suitable slight compression in order to allow it to be assembled with a slight pre-load.

It should be noted how, advantageously, the central unit 50 is the same central unit used for the assembly of the dispensing device 1 of Figure 1, which includes the use of a helical spring 30 instead of a bellows element 130.

The device that is the subject of the invention, therefore, advantageously makes it possible to use the same central unit 50 to assemble from time to time and as preferred a dispensing device 1 provided with a helical spring 30 or a dispensing device 100 provided with a bellows element 130.

This makes it possible to reduce the operations necessary for the assembly of the dispensing devices and to reduce the production costs of the same.

Regarding the operation of the dispensing device 100 just described, it is the same as explained above for the device 1 described with reference to Figures land 2.

Another variant embodiment of the dispensing device of the invention, indicated as a whole by 200, is shown in Figure 5.

Said variant differs from the solution described above with reference to Figures 1 and 2 in that the second end portion 32 of the helical spring 30 is arranged so that it stops against a counteracting element constituted by an annular stop element 201, instead of stopping against the actuator element 6. The annular stop element 201, constituted for example by a seeger ring, is housed in a peripheral annular seat 202 obtained externally on the rod 212 of the piston 5.

The annular stop element 201 is advantageously suited to be associated in a removable manner with the rod 212 of the piston 5.

With reference to Figure 6, it can be seen that the construction steps of the dispensing device 200 include the pre-assembly of the elements that make up the central unit 250 comprising the first ring nut 21. Successively, the second ring nut 22 is connected to the central unit 250 by connecting it to the first ring nut 21 by snap-fitting its inner annular edge 26 in the undercut seat 25 provided in the first ring nut 21.

The helical spring 30 is then fitted outside the rod 212 of the piston 5 and arranged so that its first end portion 31 at the top stops against the outer annular edge 24 of the first ring nut 21. Successively, the annular stop element 201 is inserted and locked axially in the peripheral annular seat 202 of the rod 212 by acting on the helical spring 30 with a suitable slight compression in order to allow it to be assembled with a slight pre-load.

Finally, the actuator element 6 is connected at the top of the rod 212.

According to the above, the annular stop element 201 is integral with the piston 5, and more particularly with the rod 212. The term "integral" means that the annular stop element 201 moves together with the piston 5 when the latter is operated and/or released. It is evident that the annular stop element 201 can move in other directions, for example it can rotate around the rod 212, still serving its function as stop element for the second end portion 32 of the helical spring 30. A variant embodiment of the dispensing device of the invention, indicated as a whole by number 300, is shown in Figure 7.

Said variant differs from the solution described with reference to Figures 1 and 2 due to the fact that the second ring nut 322 is constructed so that it is possible to assemble elastic means constituted alternatively by a helical spring 30 or by a bellows element 130.

For this purpose, the second ring nut 322 is provided both with a collar 340 and with an annular housing seat 322a obtained peripherally on its upper surface.

In the case a helical spring 30 is used, as shown in Figure 8, the collar 340 maintains the helical spring 30 guided during its compression and maintains it protected from the outside.

In the case a bellows element is used, instead, the annular edge 131a of the first end portion 131 of the bellows element 130 is arranged on the annular housing seat 322a, as shown in Figure 9.

According to the above, the dispensing device 300 advantageously makes it possible to assemble both an elastic element of the helical spring type 30 and an elastic element of the bellows type 130, with no need to modify the other elements that make up the dispensing device.

Furthermore, this device makes it possible to replace the elastic means of one type, for example a helical spring, with elastic means of another type, like a bellows element, or vice versa a bellows element with a helical spring. It should be noted, finally, that all the elements that make up the dispensing device, in its various embodiments, can advantageously be made of a plastic material. This makes it possible to obtain a completely recyclable device, with no need for any preventive operation intended to separate the parts made of metallic materials or in any case non compatible materials.

It should also be observed that the proposed solutions advantageously make it possible to produce devices for dispensing fluids that can be assembled automatically.

It has thus been shown that the present invention allows all the set objects to be achieved.

It should be underlined that all the parts described herein can be replaced with other technically equivalent parts, that any material can be used, provided that it is compatible with the intended use, and that the various elements can have any size, depending on the needs.

While the present invention has been described with reference to the particular embodiments shown in the figures, it should be noted that the present invention is not limited to the specific embodiments illustrated and described herein; on the contrary, further variants of the embodiments described herein fall within the scope of the present invention, which is defined in the claims.

Claims

1) Device for dispensing fluids (1; 100; 200; 300), comprising:

- at least one hollow body (2) defining at least one suction/compression chamber (3) for said fluid, to which at least one piston (5) is slidingly coupled, said piston (5) being movable from at least one first rest position to at least one second operating position;

- at least one supporting element (20; 120) for said at least one piston (5);

- elastic means (8; 108) suited to ensure that, once the fluid has been dispensed, said at least one piston (5) returns from said at least one operating position to said at least one rest position,

characterized in that said elastic means (8; 108) comprise a first portion (31 ;

131) that counteracts said at least one supporting element (20; 120) and a second portion (32; 132) that counteracts said at least one piston (5) through a counteracting element (6; 106; 201).

2) Device (1; 100; 200; 300) according to claim 1), characterized in that said supporting element (20; 120) comprises a first ring nut (21) that supports and guides said at least one piston (5) and a second ring nut (22; 122; 322) externally associated with said first ring nut (21).

3) Device (1 ; 200; 300) according to claim 2), characterized in that said first portion (31 ) of said elastic means (8) counteracts said first ring nut (21).

4) Device (100; 300) according to claim 2), characterized in that said first portion (131) of said elastic means (108) counteracts said second ring nut (122; 322).

5) Device (1 ; 200; 300) according to claim 3), characterized in that said elastic means (8) comprise a helical spring (30).

6) Device (100; 300) according to claim 4), characterized in that said elastic means (108) comprise a bellows element (130).

7) Device (1 ; 100; 200; 300) according to any of the preceding claims, characterized in that said counteracting element (6; 106; 201) is integral with said at least one piston (5) in the movements between said first rest position and said at least one second operating position.

8) Device (1 ; 100; 300) according to claim 7), characterized in that said counteracting element (6; 106) comprises at least one actuator element (6; 106) that is integral with said at least one piston (5) in order to allow said device ( 1 ; 100; 300) to be operated. 9) Device (200) according to any of the preceding claims, characterized in that said counteracting element (201) comprises a stop element (201) that can be associated with said at least one piston (5).

10) Device (1 ; 100; 200; 300) according to any of the claims from 2) to 9), characterized in that said first ring nut (21) and said second ring nut (22;

122; 322) are removably connected to each other.

11) Device (1; 100; 200; 300) according to claim 10), characterized in that it comprises connection means (23, 123) suited to provide said removable connection between said first ring nut (21) and said second ring nut (22; 122; 322).

12) Device (1 ; 100; 200; 300) according to claim 1 1), characterized in that said connection means (23, 123) comprise at least one seat (25) created in said first (21) or in said second ring nut (22; 122; 322) and a counteracting element (26; 126) created in said second (22; 122; 322) or in said first ring nut (21 ) and suited to be housed in said at least one seat (25).

13) Device (100; 300) according to claim 2), characterized in that said second ring nut (122; 322) comprises at least one seat (122a; 322a) suited to house said first portion (131) of said elastic means (108).

14) Device (1; 200; 300) according to claim 2), characterized in that said second ring nut (22; 322) comprises at least one collar-shaped portion (40;

340) internally suited to house said first portion (31) of said elastic means (8).

15) System for dispensing a fluid comprising a container for said fluid and a device (1, 100, 200, 300) for dispensing said fluid, characterized in that said device (1, 100, 200, 300) is constructed according to any of the preceding claims.