Device for dispensing fluid or powdered products

Abstract

Device for dispensing a fluid or powdered product comprising a dispensing head (1) provided with a dispensing outlet (10), an air flush (20) for generating an air flow when the device is actuated, and a reservoir (30) fixed to said dispensing head, said reservoir (30) comprising an air inlet (31) connected to said air flush (20) and a product outlet (32) connected to said dispensing outlet (10), said air inlet (31) comprising a product retaining member (40) for holding the product in the reservoir (30) until the product is dispensed, and said product outlet (32) being closed by a closing element (50) force-fitted into said product outlet (32), said device comprising a mechanical opening system (61, 62) cooperating with said closing element (50) to mechanically expel it from its closed position when the actuation of the device,said dispensing head (1) comprising an upper body (11) and a reservoir support (12) fixed to said upper body (11), said reservoir (30) being fixed in said reservoir support (12), said reservoir support (12) being fixed to said upper body (11) such that said reservoir support (12) cannot move axially relative to said upper body (11) but can move in rotation relative to said upper body (11). "figure for the abstract: figure 1",

Description

Title of the invention: Device for dispensing fluid or powdered product

[0001] The present invention relates to a device for dispensing a fluid or powdered product, and more particularly a rechargeable device for dispensing a single dose of product contained in a reservoir using a flow of pressurized air.

[0002] Document WO0245866 describes a device in which a closing ball is mechanically expelled by a rod secured to an air flush. This device is not reusable, and the entire device must be discarded after use. Particularly for ecological and economic reasons, it may be desirable to have a reusable device in which the reservoir would be changed after each actuation but not the air flush. Documents WO2015001281A1 and WO2017118827A1 describe similar devices.

[0003] Document WO2015001269Al describes a device of the same type, but in which the tank can be replaced and the air flush reused with several tanks. This solution is not, however, optimal, because it requires additional parts and is complex, both for its manufacture and for its assembly.

[0004] The aim of the present invention is to provide a device for dispensing fluid or powdered products which does not reproduce the aforementioned drawbacks.

[0005] The present invention therefore aims to provide a device for dispensing fluid or powdered products, which is simple and inexpensive to manufacture and assemble.

[0006] The present invention also aims to provide such a device for dispensing a fluid or powdered product which allows the use of a simple, inexpensive and reliable air flush, and which does not require the creation of a particularly powerful air flow.

[0007] The present invention also aims to provide such a device for dispensing fluid or powdered product which can be used several times with several different reservoirs.

[0008] The present invention therefore relates to a device for dispensing a fluid or powdered product comprising a dispensing head provided with a dispensing outlet, an air flush for generating an air flow when the device is actuated, and a reservoir fixed to said dispensing head, said reservoir comprising an air inlet connected to said air flush and a product outlet connected to said dispensing outlet, said air inlet comprising a product retaining member for holding the product in the reservoir until the product is dispensed, and said product outlet being closed by a closing element force-fitted into said product outlet, said device comprising a mechanical opening system cooperating with said closing element to mechanically expel it from its closed position when the device is actuated, said dispensing head comprising an upper body and a reservoir support fixed to said upper body, said reservoir being fixed in said reservoir support, said reservoir support being fixed to said upper body such that said reservoir support cannot move axially relative to said upper body but can move in rotation relative to said upper body.

[0009] Advantageously, said air flush comprises a piston sliding in an air chamber between a non-actuated position and an actuated position, said piston being brought into the non-actuated position during assembly of said dispensing head on said air flush.

[0010] Advantageously, said reservoir support comprises at least one axial lug which cooperates with at least one radial crosspiece of said piston during the assembly of said dispensing head on said air flush.

[0011] Advantageously, said reservoir support is adapted to move in rotation relative to said upper body between an assembled position, in which said at least one axial tab cooperates with said at least one radial crosspiece of said piston, so that said reservoir support and said piston move together axially towards said non-actuated position of said piston, and an activated position, in which said at least one axial tab no longer cooperates with said at least one radial crosspiece of said piston, so that said piston can move axially relative to said reservoir support to actuate the device.

[0012] Advantageously, said upper body and said tank support each comprise positioning means which cooperate in said assembled and activated positions, but which are surmountable to move from one position to the other by applying sufficient force to achieve rotation.

[0013] Advantageously, said positioning means comprise a radial lug of said upper body cooperating with a bowl of said tank support, said radial lug being able to come out of said bowl when a predetermined rotational force is applied, to rotate said tank support relative to said upper body.

[0014] Advantageously, said dispensing head comprises first alignment means cooperating with second alignment means of said air flush, to allow the assembly and disassembly of the dispensing head on the air flush, said dispensing head can only be assembled and disassembled from said air flush if said first alignment means are aligned with said second alignment means.

[0015] Advantageously, said first alignment means comprise at least one axial extension of said upper body, in particular two diametrically opposite axial extensions, extending axially downwards, and said second alignment means comprise a notch for each axial extension made in an upper axial edge of said air flush.

[0016] Advantageously, each axial extension comprises an internal radial projection which cooperates with said upper axial edge to axially block the disassembly of the dispensing head when said axial extensions are not aligned with said notches.

[0017] Advantageously, said piston, in the rest position, cooperates in a non-sealed manner with said air chamber, so that said air chamber is connected to the atmosphere in the rest position.

[0018] These characteristics and advantages and others will appear more clearly during the following detailed description of several embodiments, made with reference to the attached drawings, given as non-limiting examples, and in which:

[0019] [Fig-1] [Fig.l] is a schematic cross-sectional view of a device for distribution of fluid or powdered product according to a first embodiment, before assembly of the distribution head on the air flush,

[0020] [Fig.2] [Fig.2] is a view similar to that of [Fig.l], according to another section plane,

[0021] [Fig.3] [Fig.3] is a detailed perspective view of the piston of the device of Figures 1 and 2,

[0022] [Fig.4] [Fig.4] is a view similar to that of [Fig.l], after assembly of the distribution head on the air flush and movement of the piston to its non-actuated position,

[0023] [Fig.5] [Fig.5] is a view similar to that of [Fig.4], after rotation of the dispensing head relative to the air flush and before actuation,

[0024] [Fig.6] [Fig.6] is a detailed view in horizontal section, showing an incomplete rotation of the distribution head relative to the air flush,

[0025] [Fig.7] [Fig.7] is a view similar to that of [Fig.6], showing a complete rotation of the dispensing head relative to the air flush,

[0026] [Fig.8] [Fig.8] is a view similar to that of [Fig.4], after actuation and before rotation in the opposite direction of the dispensing head relative to the air flush,

[0027] [Fig.9] [Fig.9] is a view similar to that of [Fig.8], after rotation in the opposite direction of the distribution head relative to the air flush,

[0028] [Fig. 10] [Fig. 10] is a view similar to that of [Fig.8], after disassembly of the air flush distribution head,

[0029] [Fig. 11] [Fig. 11] is a detailed perspective view from below of the dis head tribute, and

[0030] [Fig. 12] Figures 12 to 17 show the steps of an assembly cycle, actuation and disassembly of the device of figures 1 to 11.

[0031] [Fig. 13] cf [Fig. 12]

[0032] [Fig. 14] cf [Fig. 12]

[0033] [Fig. 15] cf [Fig. 12]

[0034] [Fig. 16] cf [Fig. 12]

[0035] [Fig. 17] cf [Fig. 12]

[0036] The present invention relates more particularly to a device of the type disclosed in documents WO0245866A1, WO2015001281A1 and WO2017118827A1. These documents are particularly relevant with regard to the general operation of the device.

[0037] It is however understood that the present invention is not limited to this type of device, but is on the contrary applicable to all types of devices for dispensing fluid and / or powdered products comprising a reservoir closed by a closing element, the contents of the reservoir having to be expelled by an air flow.

[0038] It is understood that throughout the description, the terms "upper", "lower", "top" and "bottom" refer to the upright position of the device shown in particular in [Fig.l]. The terms "axial" and "radial" refer to the longitudinal central axis of the device.

[0039] The device comprises an upper sub-assembly, forming a distribution head 1, and a lower sub-assembly forming an air flush 20.

[0040] The dispensing head 1 comprises a dispensing outlet 10 through which a fluid or powdered product is dispensed when the device is actuated, as well as a radial flange forming a finger rest 2 on which the user presses his fingers during actuation.

[0041] The dispensing head 1 comprises an upper body 11 advantageously defining a nasal tip 110 provided at its upper axial end with said dispensing outlet 10 and advantageously forming said finger rest 2.

[0042] A tank support 12 is fixed to said upper body 11. This fixing of the tank support 12 in the upper body 11 may be irremovable or removable and substantially prevents axial movement of the tank support 12 relative to the upper body 11. Optionally, a small axial play, for example of 1 or 2 mm, is possible between the tank support 12 and the upper body 11. On the other hand, in all cases (removable or irremovable fixing, with or without axial play), rotation of said tank support 12 is possible relative to said upper body 11.

[0043] [Fig. 11] shows that the upper body 11 and the tank support 12 can each comprising positioning means 119, 129, which cooperate in the assembled and activated positions to maintain these angular positions, but which also allow passage from one position to the other by applying a force sufficient to achieve rotation. In the example shown in [Fig.l 1], the positioning means comprise a radial lug 119 of the upper body 11 cooperating with a cup 129 of the tank support 12. By applying a sufficient rotational force, the radial lug 119 can come out of the cup 129, thus allowing rotation of the tank support 12 relative to the upper body 11, as will be described below.

[0044] The tank support 12 comprises at least one axial tab 125 extending axially downwards, the function of which will be described below. Preferably, there are two diametrically opposed axial tabs 125.

[0045] A tank 30 is fixed in the tank holder 12. Here too, the tank 30 can be fixed in the tank holder 12 in a removably or irremovably manner.

[0046] If the reservoir support 12 is removably fixed in the dispensing head 1, then the reservoir 30 can be fixed irremovably in the reservoir support 12, and it is these two elements which are replaced after each use.

[0047] If the reservoir holder 12 is fixed irremovably in the dispensing head 1, then the reservoir 30 can be fixed removably in the reservoir holder 12, and only the reservoir 30 is replaced after each use.

[0048] It is however also possible to have the reservoir support 12 fixed irremovably in the dispensing head 1, and the reservoir 30 also fixed irremovably in the reservoir support 12. In this case, it is the entire dispensing head 1 which is replaced after each use.

[0049] The air flush 20 comprises a piston 21, an air chamber 22, an external body 26 and a pusher element 25.

[0050] The reservoir 30 comprises a hollow sleeve 39, an air inlet 31 and a product outlet 32. The air inlet 31 of the reservoir is connected to the air flush 20 and the product outlet 32 of the reservoir is connected to the dispensing outlet 10 of the dispensing head 1. The product outlet 32 is closed by a closing element 50, preferably spherical, in particular a ball, which is force-fitted into said product outlet 32. The air inlet 31 is provided with a product retaining member 40 which is adapted to hold the product in the reservoir before the device is actuated.

[0051] The air flush 20 is manually actuated by the user and is adapted to create an air flow which will pass through the reservoir 30 to carry the product which it contains towards the dispensing outlet 10.

[0052] The device comprises a mechanical opening system 61, 62, which is integral with the air flush 20, that is to say that it is actuated simultaneously with the actuation of said air flush 20, and which is adapted to cooperate with said closing element 50 to mechanically expel it from its closed position when the device is actuated. In the example shown in the figures, the mechanical opening system comprises a set of rods 61, 62, a first rod portion 61 of which is integral with the air flush 20, and a second rod portion 62 is pushed by said first rod portion 61 when the device is actuated. The set of rods 61, 62 will, at the end of the actuation stroke, i.e. in the dispensing position, cooperate with the closing element 50 to mechanically expel it from its closed position.

[0053] The product retaining member 40 can advantageously be made in one piece with the second rod portion 62.Thus, the product retaining member 40 can be made in a product-tight and airtight manner, before the device is actuated, the air pressure created by the air flush 20 only penetrating inside the reservoir 30 at the moment when said retaining member 40 is moved together with the second rod part 62, being pushed by the first rod part 61.

[0054] The retaining member 40 is advantageously produced in the form of an insert arranged inside the reservoir 30. The second rod part 62 comprises an upper axial end, which will cooperate during actuation with the closing element 50.

[0055] The air flush shown in the figures comprises the piston 21 sliding in the air chamber 22, the piston 21 being manually actuated by the user. Advantageously, this actuation is carried out by means of the pusher element 25 assembled on said piston 21.

[0056] The piston 21 comprises a hollow axial well 201 receiving in its center an axial projection forming the first rod part 61. Advantageously, the piston 21 is made of a single piece with the first rod part 61.

[0057] As seen in Figures 3, 6 and 7, at least one radial crosspiece 203 extending in the hollow axial well 201 to the first rod portion 61, preferably two radial crosspieces 203.

[0058] The air chamber 22 advantageously comprises a cylindrical body 222 comprising at its upper axial edge a radial flange 225. This radial flange 225 extends radially towards the inside of said cylindrical body 222, where it comprises an axial extension 226 extending axially downwards and radially inwards. The purpose of this axial extension 226 is to cooperate, advantageously in a substantially sealed manner, with the external surface of the reservoir support 12 of the dispensing head 1, when the device is assembled. The radial flange 225 also extends radially towards the outside of said cylindrical body 222, where it forms an upper edge 228 secured to said external body 26 assembled around said air chamber 22.

[0059] In the non-actuated position, visible in Figures 4 and 5, the air flush 20 is open to the atmosphere. In the example of [Fig.l], this opening to the atmosphere is obtained by a cylindrical part 221 of larger internal diameter of the cylindrical body 222 of the air chamber 22. In this part of larger diameter 221, provided at the lower axial edge of the air chamber 22, the piston 21 of the air flush 20 does not cooperate in a sealed manner with said air chamber. When the device is actuated, the piston 21 will move out of said part of larger diameter 221 and thus cooperate in a sealed manner with the cylindrical body 222 of the air chamber 22, to thereby compress the air contained in the air chamber.

[0060] The external body 26 advantageously comprises at its lower axial edge a radial rim 261 facing inwards and extending axially upwards, to define the non-actuated position of the piston 21, as visible in FIGS. 4 and 5. This radial rim 261 also makes it possible to protect the air flush 20 in the rest position, in particular the larger diameter part 221 of the air chamber 22 and the piston 21.

[0061] The dispensing head 1 is assembled on the air flush 20 to be able to actuate the device, then disassembles to be able to replace the empty tank with a full tank for another use of the device.

[0062] The dispensing head 1 comprises first alignment means cooperating with second alignment means of the air flush 20, to allow the assembly and disassembly of the dispensing head on the air flush.

[0063] In the example shown in the drawings, the first alignment means are formed by at least one axial extension 150 of the upper body 11, preferably two diametrically opposed axial extensions 150, extending axially downwards from the finger rest 2. The second alignment means are formed by a respective notch 250 for each axial extension 150 made in the upper axial edge 228 of the air flush. Thus, as can be seen in particular in Figures 12 and 17, the dispensing head 1 can only be assembled and disassembled from the air flush 20 if the first alignment means are aligned with the second alignment means, therefore in the example of the figures, if each axial extension 150 faces a respective notch 250. If this alignment is not achieved, the axial extensions 150 cannot slide axially around the air flush, and assembly is impossible.The same applies to disassembly, prevented by an internal radial projection 151 provided on each axial extension 150, as visible in Figures 5 and 8, blocked axially by the upper edge 228, until each internal radial projection 151 is facing a respective notch 250.

[0064] When assembling the dispensing head 1 on the air flush 20 by axial displacement of one relative to the other, when the first and second alignment means 150, 250 are aligned, the reservoir support 12 is inserted into the flush air and said at least one axial tab 125 cooperates with said at least one radial crosspiece 203 to thereby move the piston 21 axially towards its non-actuated position.

[0065] In this assembled position, shown in [Fig.4], the device cannot be actuated, since the piston 21 is blocked by the axial tabs 125, which prevent any axial movement of the piston 21.

[0066] To be able to carry out the actuation, the user must turn the dispensing head 1 relative to the air flush 20, to shift the axial tabs 125 of said radial crosspieces 203 of the piston 21, as visible in Figures 5 and 7. In this activated position of the axial tabs 125, after axial assembly and rotation of the dispensing head 1, the device can be actuated.

[0067] The positioning means 119, 129 make it possible to ensure a rotation of the upper body 11 and the tank support 12, since nothing hinders this rotation, neither at the level of the upper body 11, nor at the level of the tank support 12.

[0068] If the rotation of the dispensing head 1 is incomplete, as illustrated in [Fig.6], actuation remains impossible, since the axial tabs 125 always abut axially on the radial crosspieces 203 of the piston 21.

[0069] Advantageously, external markers 400, visible to the user, are provided on the exterior of the device, in particular on the air flush, to indicate to the user the assembled and activated positions.

[0070] The actuation of the device is illustrated in [Fig.8]. Thus, when the user wishes to actuate the device, he places his fingers on the finger rest 2 of the dispensing head 1 and his thumb on the pusher element 25, and he exerts an actuation force, which will move the first rod part 61 and the piston 21 towards the dispensing position. From the start of the actuation, visible in [Fig.2], the piston 21 of the air flush will cooperate in a sealed manner with the air chamber 22, so that the air contained in said air chamber 22 will be progressively compressed during the actuation.

[0071] After an initial air compression stroke, the upper axial end of the first rod portion 61 comes into contact with the retaining member 40 and therefore with the second rod portion 62.

[0072] Continued actuation moves said retaining member 40 axially upwards in the reservoir 30, thus out of its position of closure or sealing of the air inlet, as visible in [Fig. 6]. At this moment, the compressed air in the air chamber 22 can therefore penetrate into the reservoir 30. At the same time, the upper axial end of the second rod part 62 comes into contact with the closure element 50.

[0073] Continued actuation will therefore move the closing element 50 axially upwards, out of its closed position.

[0074] When the seal of the closure element 50 is broken, it is expelled from the reservoir 30 to allow the fluid or powdered product to be dispensed under the effect of compressed air. The closure element 50 then becomes wedged in ribs 3 of the dispensing head 1, which in particular prevent any risk of said closure element being expelled from said dispensing head 1. The dispensing position, at the end of the actuation stroke and after dispensing the product, is shown in [Fig.8].

[0075] After actuation, the user can remove the dispensing head 1 and the reservoir 30 from the air flush 20, to replace the empty reservoir with a full reservoir.

[0076] In the end of actuation position of [Fig.8], disassembly of the dispensing head 1 is impossible due to the internal radial projections 151 which are axially blocked by the upper edge 228 of the air flush.

[0077] Advantageously, in the end of actuation position of [Fig.8], the push element 25 is entirely arranged inside the external body 26 of the air flush 20. As a result, it is not accessible to the user, and cannot be pulled down manually.

[0078] To carry out the disassembly, the user must again rotate the dispensing head 1 relative to the air flush 20, but in the opposite direction, to bring the axial extensions 150 facing the notches 250. During this rotation, the axial tabs 125 of the reservoir support 12 remain locked in rotation in the piston 21, retained by the radial crosspieces 203 of the piston. Thus, when the user applies a sufficient rotational force, the positioning means 119, 129 are overcome, and the upper body 11 can rotate relative to the air flush 20, while the reservoir support 12 does not rotate.

[0079] [Fig. 9] illustrates the position after rotation, which makes it possible to disassemble the distribution head 1 from the air flush, illustrated in [Fig. 10].

[0080] It should be noted that if the user tried to reassemble the dispensing head 1 without having replaced the empty reservoir, this reassembly would not allow the piston 21 to be returned to its non-actuated position, since the axial tabs 125 of the reservoir support 12 do not cooperate in this case with the radial crosspieces 203 of the piston 21. In order to be able to refill the air flush 20 for another use of the device, it is necessary to assemble a dispensing head 1 in which the reservoir support 12 has not rotated relative to the upper body 11.

[0081] After removal of the empty tank, a new full tank can be assembled on the air flush, which is therefore reusable.

[0082] If the reservoir 30 is removable from the reservoir holder 12, the reservoir holder 12 and the upper body 11 of the dispensing head 1 can also be reused, and only the reservoir 30 is disposable and replaceable. In this case, the user can remove the empty tank from the tank holder 12 and replace it with a full tank. If necessary, the user can also manually rotate the tank holder 12 relative to the upper body 11, to return the dispensing head to the assembled configuration allowing the piston 21 to be moved to its non-actuated position when assembling the dispensing head 1 on the air flush 20.

[0083] If the reservoir 30 is irremovable from the reservoir support 12, but the latter is removable from the upper body 11, then the upper body 11 can be reused, and only the unit formed by the reservoir 30 and the reservoir support 12 is disposable and replaceable. In this case, the user can remove the reservoir support 12 with the empty reservoir and replace it with a reservoir support with a full reservoir. In this case, the user assembles the reservoir support 12 relative to the upper body 11 in such a way as to have the dispensing head in the assembled configuration allowing the piston 21 to be moved to its non-actuated position when assembling the dispensing head 1 on the air flush 20.

[0084] In the example of the figures, the reservoir 30 is irremovable from the reservoir support 12, and the latter is irremovable from the upper body 11. In this case, the dispensing head 1 as a whole is disposable and replaceable.

[0085] The user then inserts the dispensing head 1 again into the air flush 20, pushing the piston 21 towards its assembled and non-actuated position. At the end of insertion, just before reaching the non-actuated position of [Fig. 4], the piston 21 cooperates with the part of larger internal diameter 221 of the air chamber 22 to thus remove the seal at this location, and the air flush 20 is therefore open to the atmosphere in the non-actuated position.

[0086] Although intended primarily for the distribution of a powdered product, the present invention could also be applied to the distribution of liquid products.

[0087] The present invention has been described with reference to a preferred embodiment, but it is understood that a person skilled in the art may make any modifications thereto, without departing from the scope of the present invention as defined by the appended claims.

Claims

Claims

1. Device for dispensing a fluid or powdered product comprising a dispensing head (1) provided with a dispensing outlet (10), an air flush (20) for generating an air flow when the device is actuated, and a reservoir (30) fixed to said dispensing head, said reservoir (30) comprising an air inlet (31) connected to said air flush (20) and a product outlet (32) connected to said dispensing outlet (10), said air inlet (31) comprising a product retaining member (40) for holding the product in the reservoir (30) until the product is dispensed, and said product outlet (32) being closed by a closing element (50) force-fitted into said product outlet (32), said device comprising a mechanical opening system (61, 62) cooperating with said closing element (50) to mechanically expel it from its position shutter when actuating the device,said dispensing head (1) comprising an upper body (11) and a reservoir support (12) fixed to said upper body (11), said reservoir (30) being fixed in said reservoir support (12), characterized in that said reservoir support (12) is fixed to said upper body (11) in such a way that said reservoir support (12) cannot move axially relative to said upper body (11) but can move in rotation relative to said upper body (11).,

2. Device according to claim 1, wherein said air flush (20) comprises a piston (21) sliding in an air chamber (22) between a non-actuated position and an actuated position, said piston being brought into the non-actuated position during assembly of said dispensing head (1) on said air flush (20).

3. Device according to claim 2, wherein said reservoir support (12) comprises at least one axial tab (125) which cooperates with at least one radial crosspiece (203) of said piston (21) during assembly of said dispensing head (1) on said air flush (20).

4. Device according to claim 3, wherein said reservoir support (12) is adapted to move in rotation relative to said upper body (11) between an assembled position, in which said at least one axial tab (125) cooperates with said at least one radial crosspiece (203) of said piston (21), so that said reservoir support (12) and said piston (21) move together axially towards said non-actuated position of said piston (21), and an activated position, in which said at least one axial tab (125) no longer cooperates with said at least one radial crosspiece (203) of said piston (21), so that said piston (21) can move axially relative to said reservoir support (12) to actuation of the device.

5. A device according to claim 4, wherein said upper body (11) and said reservoir support (12) each comprise positioning means (119, 129) which cooperate in said assembled and activated positions, but which are surmountable to move from one position to the other by applying sufficient force to effect rotation.

6. Device according to claim 5, wherein said positioning means comprise a radial lug (119) of said upper body (11) cooperating with a cup (129) of said reservoir support (12), said radial lug (119) being able to come out of said cup (129) upon application of a predetermined rotational force, to rotate said reservoir support (12) relative to said upper body (11).

7. Device according to any one of the preceding claims, wherein said dispensing head (1) comprises first alignment means (150) cooperating with second alignment means (250) of said air flush (20), to allow assembly and disassembly of the dispensing head on the air flush, said dispensing head (1) can only be assembled and disassembled from said air flush (20) if said first alignment means (150) are aligned with said second alignment means (250).

8. Device according to claim 7, wherein said first alignment means comprise at least one axial extension (150) of said upper body (11), in particular two diametrically opposed axial extensions (150), extending axially downwards, and said second alignment means comprise a notch (250) for each axial extension (150) made in an upper axial edge (228) of said air flush (20).

9. Device according to claim 8, wherein each axial extension (150) comprises an internal radial projection (151) which cooperates with said upper axial edge (228) to axially block the disassembly of the dispensing head (1) when said axial extensions (150) are not aligned with said notches (250).

10. Device according to any one of the preceding claims, in which said piston (21), in the rest position, cooperates in a non- sealed with said air chamber (22), so that said air chamber (22) is connected to the atmosphere in the rest position. * * *

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