FR3059652A1 - HEAD FOR DISPENSING A COSMETIC COMPOSITION HAVING A SEALED SPOUT, DEVICE AND ASSEMBLY THEREFOR - Google Patents

Abstract

The head comprises: - a preparation and dispensing duct of the cosmetic composition, comprising a dispensing spout and a dispensing cannula projecting with respect to the spout. The dispensing spout has an outer skirt (44) having an interior passageway having a first cross section, the dispensing cannula having a first portion (46) cooperating with the outer skirt (44). The first portion (46) has a sealing flange sealingly engaged around the outer skirt (44). The dispensing cannula has a second portion (30) protruding from the first portion (46), defining an inner product delivery channel, the inner channel having a second cross section different from the first cross section.

Description

Dispensing head for a cosmetic composition provided with a tight spout, device and associated mounting

The present invention relates to a head for dispensing a cosmetic composition comprising a conduit for preparing and distributing the cosmetic composition, suitable for being connected to at least one reservoir of at least one cosmetic product, the conduit for preparing and distributing comprising a dispensing spout opening out of the head and a dispensing cannula projecting from the dispensing spout.

This head is intended to be mounted on a container containing a cosmetic composition, in particular a viscous cosmetic composition comprising one or more cosmetic products.

A cosmetic product is in particular a product as defined in Regulation EC No. 1223/2009 of the European Parliament and of the Council dated November 30, 2009, relating to cosmetic products.

The aforementioned dispensing head can be used in particular for highly viscous cosmetic compositions (for example of viscosity greater than 1000 mPa.s).

This is particularly the case for dye compositions which use particularly viscous coloring products. In this type of composition, the oxidizing cosmetic product may have a viscosity of the order of 10,000 mPa.s and the coloring cosmetic product of the order of 5000 mPa.s.

Heads of the aforementioned type are described for example in JP 2014234187 A or JP 2013079082 A.

The device then comprises a first reservoir containing a first cosmetic product and a second reservoir containing a second cosmetic product. The cosmetic products are distributed simultaneously in a common distribution conduit and are ejected through a spout protruding from the head.

In heads of the aforementioned type, to receive the two products simultaneously, the spout has an elongated cross section, for example rectangular or oval.

To distribute the products simultaneously, especially in the form of a mixture, it is often preferable to have a substantially circular outlet orifice.

It is generally not possible or extremely difficult to obtain a molded part having such a change in section at the level of the dispensing spout. Furthermore, in order to facilitate or improve the mixing of the two products, it may also be advantageous to associate a mixer with the dispensing spout.

These constraints require the use of an insert inserted into the spout in order to change the section and possibly to supply the mixer.

Such a solution is not entirely satisfactory. The tightness of a part with a non-circular cross-section is indeed difficult to guarantee given the manufacturing tolerances.

An object of the invention is to obtain a head allowing a clean and effective distribution of a cosmetic composition, even when the latter is viscous.

To this end, the invention relates to a head of the aforementioned type, characterized in that:

the dispensing spout comprises an outer skirt having an inner passage having a first cross section at a free edge of the outer skirt, the dispensing cannula comprising a first part cooperating with the outer skirt, one of the outer skirt and of the first part having a sealing rim sealingly engaged around the other of the external skirt and of the first part, and in that, the dispensing cannula comprises a second part projecting with respect to the first part, the second part defining an inner product delivery channel opening at an outlet from the dispensing cannula, the inner channel having, at the outlet of the dispensing cannula, a second cross section different from the first cross section.

Thanks to the introduction on one of the external skirt and of the first part of the cannula of a sealing rim sealingly engaged on the other of the external skirt and of the first part of the cannula, the dispensing a cosmetic composition, even very viscous, does not cause the product to leak. In particular, the seal is well ensured at the level of the dispensing spout, even if it is of very different cross section from that of the second part of the dispensing cannula, in particular of non-circular cross section.

According to a variant, the sealing rim delimits a sealing lip, the sealing lip covering the entire periphery of the other of the outer skirt and of the first part of the dispensing cannula.

The presence of a lip covering the entire periphery of the other of the outer skirt and of the second part of the cannula guarantees optimum sealing at the junction between the outer skirt and the cannula.

Alternatively, the sealing rim defines a peripheral groove for insertion of the other of the outer skirt and of the first part.

The presence of a peripheral groove allows easy mounting by inserting the other of the outer skirt and of the second part of the cannula into the groove provided for this purpose.

According to variants, the inner channel of the second part has a circular cross section at the outlet of the dispensing cannula.

The inner passage of the outer skirt has, at its free edge, a non-circular cross section, in particular an elongated cross section.

The presence of a cylindrical inner channel guarantees easy distribution, especially when the composition distributed is a mixture of products. A non-circular cross-section facilitates dispensing from two separate product tanks.

According to variants, the dispensing cannula comprises an intermediate piece forming the first part of the dispensing cannula and an insert mounted movable relative to the intermediate piece forming the second part of the dispensing cannula.

The intermediate piece has a central body inserted into the outer skirt, the central body defining an insertion slot for the insert.

The cannula formed of an intermediate piece and a removable insert allows simple cleaning of the insert, while providing a satisfactory seal. It allows the possible replacement of the insert, depending on the desired use.

Alternatively, the insert includes a static mixer.

The static mixer includes:

- At least one longitudinal wall capable of separating the insertion lumen into a first region and into a second region, the longitudinal wall defining at least one through hole connecting the first region to the second region;

- at least a first mixing element projecting into the first region;

- at least one second mixing element projecting into the second region.

The preparation and distribution conduit is adapted to be connected simultaneously to a first reservoir of first cosmetic product, and to a second reservoir of second cosmetic product.

These characteristics allow a homogeneous mixing of the cosmetic composition, in particular when the dispensing head is connected to two reservoirs of two cosmetic products to be mixed.

The invention also relates to a device comprising:

- at least one reservoir of at least one cosmetic product;

- A dispensing head as defined above, the preparation and dispensing conduit being connected to the or to each reservoir.

The device according to the invention can include one or more of the following characteristics:

The device includes:

- a first reservoir containing a first cosmetic product;

- a second reservoir containing a second cosmetic product;

a dispensing head as defined above, the preparation and dispensing conduit being connected simultaneously to the first tank and to the second tank

The viscosity of the first cosmetic product is greater than 1000 mPa.s, in particular greater than 5000 mPa.s.

The viscosity of the second cosmetic product is greater than 1000 mPa.s, in particular greater than 10 000 mPa.s.

The device thus formed uses the same dispensing head for dispensing a cosmetic composition formed by mixing a first cosmetic product with a second cosmetic product.

Advantageously, the invention also relates to a method of mounting a dispensing head comprising the following steps:

supply of a diffuser comprising a conduit for preparing and distributing the cosmetic composition, suitable for being connected to at least one reservoir of at least one cosmetic product, the preparation and distribution conduit comprising a dispensing spout, the dispensing spout comprising an external skirt having an internal passage having a first cross section at a free edge of the external skirt;

mounting of a dispensing cannula projecting relative to the dispensing spout, the dispensing cannula comprising a first part cooperating with the external skirt, one of the external skirt and the first part having at least one rim d sealing, and sealing engagement of the sealing rim around the other of the outer skirt and of the first part, the dispensing cannula comprising a second part intended for dispensing cosmetic product, projecting relative to the first part, the second part defining an inner channel opening at its inner end into the inner passage of the outer skirt, and having at an outlet from the dispensing cannula a second cross section different from the first cross section.

The invention will be better understood on reading the description which follows, given solely by way of example, and made with reference to the accompanying drawings, in which:

- Figure 1 illustrates a first device for packaging and dispensing a cosmetic composition, the device comprising a dispensing head according to the invention;

- Figure 2 is a side view of the head of Figure 1;

- Figure 3 is an exploded perspective view of the dispensing head according to the invention;

- Figure 4 is a sectional view of the insert of Figure 3 in its position mounted in the spout, the dispensing head comprising an intermediate piece and an insert,

- Figure 5 is a side view of the insert of Figure 3;

- Figure 6 is a side view of the stop of the insert of Figure 3;

- Figure 7 is a top view of the intermediate piece of Figure 3;

- Figure 8 is a front view of the intermediate piece of Figure 2;

- Figure 9 is a sectional view along the plane IX-IX of the intermediate piece of Figure 7;

FIG. 10 is a sectional view along a median axial plane of the intermediate piece in FIG. 7.

In what follows, the terms "internal" and "external" generally mean with respect to the direction of circulation of the product or of the cosmetic composition. The term "external" means closer to the output of the device while the term "internal" means more distant from this output.

A first device 10 for packaging and dispensing a cosmetic composition, obtained by mixing a first cosmetic product and a second cosmetic product is illustrated in FIGS. 1 to 9.

The cosmetic composition is for example a composition for coloring the keratin fibers of a user, in particular the hair of a user.

The cosmetic composition is produced from a first coloring cosmetic product and a second oxidizing cosmetic product. The first cosmetic product and the second cosmetic product are stored separately in the device 10.

The first cosmetic product comprises, in a known manner, an alkaline agent. The alkaline agent is for example mineral such as ammonia, organic, such as an organic or hybrid amine such as an amine salt. It advantageously comprises at least one coloring agent such as an oxidation dye precursor, a direct dye or their mixtures. It optionally contains at least one anionic, nonionic, cationic, amphoteric and / or zwitteronic surfactant.

The second cosmetic product contains at least one oxidizing agent, different from oxygen in the air, such as hydrogen peroxide. It comprises at least one fatty substance. By "fatty substance" is meant an organic compound insoluble in water at ordinary temperature (25 ° C) and at atmospheric pressure (760mm Hg) (solubility less than 5% and preferably 1% even more preferably at 0.1%). The fatty substances are chosen, for example, from hydrocarbons, oils, fatty alcohols, fatty acid and / or fatty alcohol esters other than triglycerides and vegetable waxes, non-silicone waxes, silicones, and their mixtures. .

It optionally contains at least one anionic, nonionic, cationic, amphoteric and / or zwitteronic surfactant.

The first cosmetic product and the second cosmetic product are here viscous products. The first cosmetic product and the second cosmetic product can each have a viscosity ranging from 1000 mPa.s to 60,000 mPa.s preferably from 5,000 mPa.s to 40,000 mPa.s.

For example, the viscosity of the first cosmetic product is in particular between 10,000 mPa.s and 40,000 mPa.s.

The viscosity of the second cosmetic product is in particular between 5000 mPa.s to 15000 mPa.s.

The viscosity of the products is measured at 25 ° C. using a Brookfield LVT viscometer equipped with an M4 mobile rotating at a speed of 12 revolutions per minute. The measurement is taken after 1 minute.

To form the cosmetic composition, the first cosmetic product and the second cosmetic product are mixed within the device 10 which distributes the cosmetic composition thus formed.

In this example, the first cosmetic product and the second cosmetic product are received respectively in a first reservoir 12 and in a second reservoir 14 of the device 10, in the form of an aerosol, comprising a propellant gas.

In one embodiment, the propellant is common to the first cosmetic product and to the second cosmetic product. It is arranged in the space located outside the first reservoir 12 and the second reservoir 14. As a variant, the propellant gas is disposed in each reservoir 12, 14.

As illustrated in FIG. 1 and in FIG. 2, the packaging and distribution device 10 comprises a container 16 receiving the reservoirs 12, 14, and a head 20 for mixing the cosmetic products and distributing the cosmetic composition, mounted on a neck 18 of the container 16.

Each reservoir 12, 14 is provided at its upper end with a product distribution member 22. The dispensing member 22 is here a movable rod controlling the opening of a valve.

The movement of the product distribution member 22 allows the distribution of each product from the reservoir 12, 14 to the outside.

With reference to FIGS. 1 to 3, the mixing and dispensing head 16 comprises a hoop 24 for mounting on the neck 18, a diffuser 26 mounted on the hoop 24 and a dispensing spout 28 projecting relative to the diffuser 26.

The head 16 further comprises a dispensing cannula suitable for engaging on the dispensing spout 28. The dispensing cannula comprises a first internal part suitable for receiving cosmetic products, and a second external part suitable for preparing and delivering the mixture of cosmetic products.

In the example illustrated by FIGS. 1 to 10, the internal and external parts of the dispensing cannula are movable relative to one another. The internal part of the dispensing cannula is formed by an intermediate part 46. The external part of the distributing cannula is formed by an insert 30, suitable for being removably mounted on the intermediate part 46.

The head 16 in this case comprises a mechanism 32 for locking in position the insert 30 on the intermediate piece 46, visible in FIG. 3.

The diffuser 26 comprises a cover 34 assembled on the hoop 24, a conduit 36 for preparing and distributing the cosmetic composition, and at least one movable member 38 for actuating the mixture and the distribution.

The preparation conduit 36 comprises a first upstream section 40, mounted on the dispensing member 22 of the first tank 12, a second upstream section 42, mounted on the dispensing member 22 of the second tank 14, the dispensing spout 28 being connected to the upstream sections 40, 42. The dispensing spout 28 partially projects out of the cover 34.

The movable actuating member 38 is able to move the first upstream section 40 and the second upstream section 42 to simultaneously actuate the dispensing member 22 of the first tank 12 and the dispensing member 22 of the second tank 14.

Referring to Figure 3, the dispensing spout 28 here comprises an outer skirt 44. The outer skirt 44 defines an interior passage of non-circular cross section. It projects out of the cover 34 to a free edge 48, along an axis A-A ’of insertion of the insert 30.

In this example, the first cross section of the inner passage of the outer skirt 44, taken at the free edge 48 is elongated horizontally. This section is here oval, with its largest dimension oriented horizontally.

Referring to Figure 7, the intermediate piece 46 comprises a central body 50 inserted in the outer skirt 44 along the insertion axis A-A 'and an outer transverse plate 52 projecting circumferentially relative to the central body 50 at an external end of the central body 50.

With reference to FIGS. 8 to 10, the central body 50 internally defines a central insertion lumen 54, of circular cross section and of axis A-A ’. The central body 50 also has two side blind holes 55A, 55B, located on either side of the lumen 54 and intended for molding the intermediate piece 46.

As can be seen in FIG. 7, the central body 50 defines an intermediate section 56 and two end tabs 58, 60 projecting inwards relative to the intermediate section 56.

The insertion lumen 54 opens at its internal end into a collection chamber 62 delimited by the space located between the legs 58, 60.

The collection chamber 62 is connected to the first upstream section 40 and to the second upstream section 42 to receive a mixture of the first cosmetic product and the second cosmetic product.

The area of the cross section of the passage of the insertion lumen 54 taken in a plane perpendicular to the axis of insertion A-A 'passing through the free edge 48 is less than the area of the cross section of the passage inside of the outer skirt 44 in the same plane.

The insertion lumen 54 opens outward through the transverse plate 52.

As shown in Figure 7, the transverse plate 52 has a substantially planar external surface. It comprises a sealing rim 64 projecting inwards at the periphery of the external surface, around the central body 50, radially away from the latter.

The sealing rim 64 is applied in leaktight manner to the outside of the skirt 42. It defines with the central body 50 a peripheral groove 66 (visible in FIG. 9) into which the free edge 48 of the external skirt is inserted 44. It defines a sealing lip disposed around the free edge 48 of the outer skirt 44.

With reference to FIG. 5, the insert 30 comprises an internal region suitable for being inserted into the insertion lumen 54, constituting a mixer 68, and an external nozzle 70 intended for dispensing the composition, projecting relative to the dispensing spout 28 when the insert 30 is in the position mounted on the dispensing spout 28.

The mixer 68 is a mixer as described in French patent application No. 15 61 885.

The mixer 68 of the insert 30 here has a longitudinal wall 72 for separating the insertion lumen 54 into two disjoint regions, a plurality of first mixing elements 74 disposed in a first region of the insertion lumen 54, d one side of the longitudinal partition wall 72 and a plurality of second mixing elements 76 disposed in a second region of the insertion lumen 54 on another side of the longitudinal partition wall 72.

The two regions of the insertion lumen 54 are defined respectively by a first face 78 of the longitudinal wall 72 and by a second face 80 of the longitudinal wall 72.

The longitudinal wall 72 is perforated. It has a plurality of through holes 81, extending perpendicular to the axis A-A ’while being spaced apart longitudinally from one another.

The through holes 81 open on the first face 78 and on the second face 80 to connect the first region to the second region.

The first mixing elements 74 are spaced longitudinally from each other along the axis A-A ’. They are staggered. They project towards the axis A-A ’respectively from a first side and from a second side of the peripheral wall of the insertion lumen towards the axis A-A’. They also project away from the longitudinal wall 72 from the first face 78.

In this example, the first mixing elements 74 are each located opposite a through hole 81.

Each first mixing element 74 has an L-shaped horizontal section.

The longitudinal wall 72, the first mixing elements 74 and the second mixing elements 76 thus define in insertion light 54 tortuous paths for the passage of the mixture formed by the first cosmetic product and by the second cosmetic product. These paths pass successively above and then below the longitudinal wall 72 through the through holes 81. They also pass in a zigzag pattern on either side of the longitudinal wall 72, being delimited laterally and transversely, respectively against the first mixing elements 74 and against the second mixing elements 76.

The nozzle 70 of the insert 30 is located at the end of the dispensing spout 28. It has an inner cosmetic product delivery channel having a circular guide cross section, for dispensing the cosmetic composition obtained by mixing the first cosmetic product. with the second cosmetic product.

The inner channel is connected to the inner passage of the outer skirt 44. It has, at the outlet of the nozzle 70, a second cross section different from the first cross section of the distribution passage, taken at the free edge of the outer skirt 44.

The area of the second cross section is here less than the area of the first cross section.

The nozzle 70 of the insert 30 is also provided with two longitudinal gripping members 82 projecting laterally. The gripping members 82 allow a user to impart a rotational movement to the insert 30 around the axis A-A ’.

The insert 30 is mounted movable in translation along the axis A-A ’between a disassembled position disposed away from the dispensing spout 28 and an intermediate position inserted in the central lumen 54 of the dispensing spout 28.

Once in the intermediate position, the insert 30 is mounted so that it can rotate about the axis A-A ’between the intermediate position and the mounted position.

The mechanism 32 for locking in position comprises at least one stop 86A, 86B carried by the insert 30 (visible in FIG. 6) and, for each stop of the insert 30, a complementary stop 88A, 88B carried by the spout distribution 28 (visible in FIG. 7), suitable for cooperating with the stop 86A, 86B in the position mounted on the distribution spout 28.

In this example, the insert 30 has two stops 86A, 86B, diametrically opposite. Each stop 86A, 86B, projects radially from an external surface of the nozzle 70 of the insert 30.

With reference to FIG. 6, the stop 86A, 86B comprises an inclined clamping ramp 90, of increasing height as it moves around the axis AA ′, and a transverse blocking surface 92 extending from the 'outer end of the clamping ramp 90, on a given angular sector around the axis A-A'.

In this example, as shown in FIGS. 7 and 8, the dispensing spout 28 is provided with two complementary stops 88A, 88B. Each complementary stop 88A, 88B is formed by a stirrup 94 projecting away from the external surface of the plate 52 towards the axis A-A ', the stirrup 94 defining with the external surface an intermediate space 96 for receiving the stop 86A, 86B.

The stirrup 94 has a retaining tab 98 arranged parallel to the external surface and a base 100 connecting the tab 98 to the external surface.

The tongue 98 projects towards the axis A-A ’from the base 100. It has here a free edge of concave outline corresponding to the outline of the insertion lumen 54 (see FIG. 8).

The base 100 defines a locking surface 102 located under the tongue 98 to partially close the intermediate space 96 and lock the stop 86A, 86B of the insert 30 in rotation, when the latter is inserted in the intermediate space 96.

In the mounted position, each stop 86A, 86B of the insert 30 cooperates with a complementary stop 88A, 88B of the dispensing spout 28, by being inserted in the intermediate spaces 96, delimited by each of the two complementary stops 88A, 88B with the outer plate 52.

In the mounted position, the insert 30 is thus immobile in translation along the insertion axis A-A ’of the insert 30, in the insertion lumen 54 of the intermediate piece 46.

In the intermediate position, each stop 86A, 86B is angularly offset with respect to the corresponding complementary stop 88A, 88B. The insert 30 is movable in translation along the axis A-A ’.

The mounting of the device 10 will now be briefly described

Initially, the first reservoir 12 and the second reservoir 14 are filled respectively with the first cosmetic product and the second cosmetic product in the container 16. The diffuser 26 is placed on the mounting band 24 which is then assembled on the neck 18.

During assembly, the first upstream section 40 and the second upstream section 42 are connected respectively to the distribution members 22 of the first tank 12 and the second tank 14.

The intermediate piece 46 is mounted in the outer skirt 44, the free edge 48 of the skirt 40 being inserted in a sealed manner in the peripheral groove 66 of the sealing rim 64.

Adequate sealing is thus produced around the outer skirt 44, despite its elongated shape, by application of the sealing rim 64 on the free edge 48. The free edge 48 of the outer skirt 40 is received between the central body 50 and the sealing rim 64 of the intermediate piece 46.

The insert 30 is initially in a disassembled position outside the dispensing spout 28. The user grasps it and introduces it into the insertion lumen 54 of the intermediate piece 46, by moving it in translation along the axis A-A 'to the intermediate position. Then, it grabs the gripping members 82 on the nozzle 70 of the insert 30. It rotates the insert 30 around the insertion axis A-A ’to reach the position mounted in the dispensing spout 28.

During this movement, each stop of the insert 30 cooperates with a complementary stop 88A, 88B of the intermediate piece 46. Each ramp 90 of a stop

86A, 86B is gradually introduced into the intermediate space 96 under a tongue of a complementary stop 88A, 88B ensuring by cam effect, a thrust of the insert 30 along the axis A-A 'towards the inside.

The transverse surface 92 of each stop 86A, 86B is inserted into the intermediate space 96 and bears under the tongue 98. When the stop 86A, 86B abuts against the blocking surface 102, the insert 30 is locked in rotation in one direction and is immobilized in translation outwards along the axis A-A 'by cooperation between each stop 86A, 86B and the corresponding intermediate stop 88A, 88B. The stop 86A, 86B and the intermediate stop 88A, 88B form a locking mechanism 32 of the "bayonet" type.

Furthermore, the insertion lumen 54 being of cylindrical shape, like the insert 30, the seal between the insert 30 and the intermediate piece 46 is effective, despite the horizontally elongated shape of the dispensing spout 28.

The use of the device 10 will now be described.

Initially, the user grasps the receptacle 16 and presses on the movable member 34. The displacement of the movable member 34 causes the simultaneous movement of the first upstream section 40 and the second upstream section 42 and the activation of the distribution members 22 This generates the simultaneous distribution of the first cosmetic product from the first reservoir 12 and the second cosmetic product from the second reservoir 14.

The first cosmetic product and the second cosmetic product go up respectively through the first upstream section 40 and through the second upstream section 42 to reach the upstream collecting chamber 62. The products meet and penetrate the insertion lumen 54 in which the internal part of the insert 30 is inserted.

Inside the insertion lumen 54, at the level of the mixer 68 constituted by the internal part of the insert 30, the flow of first product and the flow of second product are each separated horizontally by the longitudinal wall 72 and combine on either side of this wall 72.

In contact with the first mixing elements 74 and the second mixing elements 76, the flows are offset laterally with respect to the axis A-A ’and follow a tortuous zig-zag path until reaching a through hole 81.

During the passage opposite each hole 81, part of the flow flowing above the longitudinal wall 72 crosses the hole 81 to mix with another part of the flow flowing below the longitudinal wall 72.

Likewise, part of the flow circulating below the longitudinal wall 72 passes through the hole 81 in order to mix with another part of the flow circulating above the longitudinal wall 72.

The flows of cosmetic products therefore follow both a winding horizontal path in the form of a zig-zag on either side of the longitudinal wall 72 progressing along the axis AA ′, but also a vertical path perpendicular to the longitudinal wall 72 through the successive through holes 81.

The mixing of the first cosmetic product with the second cosmetic product is therefore particularly effective, taking into account the turbulence generated, and this despite the high viscosities of the first cosmetic product and the second cosmetic product.

This produces a very homogeneous cosmetic composition, with a weight ratio of between 0.25 and 4, preferably between 0.5 and 2, in particular one for one, which thus exhibits optimal properties of use. This is obtained without manual intervention by the user to mix the products, with a simple mixer constituted by the internal part of the insert 30, having the structure defined above.

For example, when the rods of the dispensing members 22 have a cross section of approximately 2 mm, the respective exit speed of the first cosmetic product and the second cosmetic product from the reservoirs is of the order of 2 m / s. The Reynolds number of the first cosmetic product is then approximately 0.2 for a viscosity of 10 000 mPa.s and the Reynolds number of the second cosmetic product is approximately 0.4 for a viscosity of 5000 mPa.s.

The overall restitution speed is of the order of 0.2 m / s at the outlet of the dispensing spout 28. In the absence of a mixer, the flow in the dispensing spout 28 is purely laminar and no mixing occurs. product between the first cosmetic product and the second cosmetic product.

The presence of the mixer 68 ensures a very effective mixing, thanks to the tortuous movement in three dimensions within the mixer 68, making it possible to form the composition at the end of its passage in the insertion lumen 54.

Such an effect is not achieved using simple two-dimensional baffles, or using a tortuosity-free propeller.

Furthermore, the presence of the intermediate piece 46 seals the dispensing spout 28 thanks on the one hand to the complementary cooperation between the sealing rim 64 and the free edge of the external skirt 44 and thanks to the simple shape insertion lumen 54 corresponding to the simple shape of insert 30.

In addition, in the mounted position, the insert 30 is immobilized in translation along the insertion axis A-A ’in the direction of distribution of the cosmetic composition, thus avoiding any ejection during distribution. The distribution of the composition is therefore very reliable, even if the viscosity is high.

After use, the insert 30 is again moved in rotation about the axis AA ', from its position mounted on the dispensing spout 28, towards the intermediate position in which each stop 86A, 86B is angularly offset from the complementary stop 88A, 88B corresponding. Then, the insert 30 is extracted in translation along the axis A-A ’out of the to be removed from the insertion lumen 54.

Once removed, the insert 30 can be easily cleaned, ensuring sustainable use of the device 10.

Alternatively, the intermediate piece 46 and the insert 30 are permanently assembled one on the other. The insert 30 is not removable with respect to the intermediate piece 46.

According to another variant, the dispensing cannula is made in one piece. The first part and the second part of the dispensing cannula then came in one piece.

According to yet another variant, the sealing rim 64 is carried by the outer edge of the outer skirt 44. In this case, the rim 64 is engaged in leaktight fashion around the first part of the dispensing cannula during engagement of the dispensing cannula with the external skirt 44.

According to another variant, the external skirt 44 of the dispensing spout 28 defines an interior passage having a first circular cross section, and the internal channel of the dispensing cannula has a second circular cross section, with an area different from the area of the first cross section.

This change of section allows, for example, a distribution in the form of the cosmetic product.

Alternatively, the area of the first cross section defined by the inner passage of the outer skirt 44 is less than the area of the second cross section defined by the internal channel of the dispensing cannula.

In all the embodiments, the use of a dispensing cannula having an internal channel of cross section different from the cross section of the internal passage of the dispensing spout, makes a transition between the two cross sections, guaranteeing an excellent seal. between the cannula and the spout.

Claims (14)

1Head (20) for dispensing a cosmetic composition comprising: - a conduit (36) for preparing and distributing the cosmetic composition, suitable for being connected to at least one reservoir (12, 14) of at least one cosmetic product, the conduit (36) for preparing and distributing comprising dispensing spout (28) opening out of the head (20) and a dispensing cannula projecting from the dispensing spout (28), characterized in that the dispensing spout (28) has an external skirt (44) having an internal passage having a first cross section at a free edge of the external skirt (44), the dispensing cannula comprising a first part (46) cooperating with the external skirt (44), one of the skirt outer (44) and the first part (46) having a sealing rim (64) engaged in a sealed manner around the other of the outer skirt (44) and the first part (46), and in that , the dispensing cannula comprises a second part (30) faisa protruding from the first part (46), the second part (30) defining an internal product delivery channel opening at an outlet from the dispensing cannula, the inner channel presenting, at the outlet of the dispensing cannula, a second cross section different from the first cross section. 2, - dispensing head (20) according to claim 1, wherein the sealing flange (64) (64) delimits a sealing lip, the sealing lip covering the entire periphery of the other of the outer skirt (44) and of the first part (46) of the dispensing cannula. 3. - dispensing head (20) according to any one of claims 1 or 2, in which the sealing rim (64) defines a peripheral groove (66) for insertion of the other of the external skirt ( 44) and the first part (46). 4, - Dispensing head (20) according to any one of the preceding claims, in which the inner channel of the second part (46) has a circular cross section at the outlet from the dispensing cannula. 5. - dispensing head (20) according to any one of the preceding claims, in which the internal passage of the external skirt (44) has, at its free edge (48), a non-circular cross section, in particular an elongated cross section. 6. - dispensing head (20) according to any one of the preceding claims, in which the dispensing cannula comprises an intermediate piece (46) forming the first part of the dispensing cannula and an insert (30) mounted movable relative to to the intermediate piece (46) forming the second part of the dispensing cannula. 7. - A dispensing head (20) according to claim 6, in which the intermediate piece (46) comprises a central body (50) inserted in the external skirt (44), the central body (50) delimiting a light (54) inserting the insert (30). 8. - Dispensing head (20) according to any one of claims 6 to 7, in which the insert (30) comprises a static mixer (68). 9. - dispensing head (20) according to claim 8, in which the static mixer (68) comprises: - at least one longitudinal wall (72) capable of separating the insertion lumen (54) into a first region and into a second region, the longitudinal wall (72) defining at least one through hole (81) connecting the first region to the second region; - at least a first mixing element (74) projecting into the first region; - at least one second mixing element (76) projecting into the second region. 10. - dispensing head (20) according to any one of the preceding claims, in which the conduit (36) for preparation and distribution is suitable for being connected simultaneously to a first reservoir (12) of the first cosmetic product, and to a second reservoir (14) of second cosmetic product. 11. - Device (10) for packaging and / or distributing a cosmetic composition, comprising: - at least one tank ( 12, 14) of at least one cosmetic product; - a dispensing head (20) according to any one of the preceding claims, the preparation and dispensing conduit (36) being connected to or to each reservoir (12, 14). 5 12, - Device (10), according to claim 11, comprising: - a first reservoir (12) containing a first cosmetic product; - a second reservoir (14) containing a second cosmetic product; - a head (20) according to any one of claims 1 to 10, the preparation and distribution conduit (36) being connected simultaneously to the first reservoir (12) and 10 to the second tank (14). 13.- Device (10) according to claim 12, wherein the viscosity of the first cosmetic product is greater than 1000 mPa.s, in particular greater than 5000 mPa.s. 15 14, - Device (10) according to any one of claims 12 or 13, in which the viscosity of the second cosmetic product is greater than 1000 mPa.s, in particular greater than 10 000 mPa.s.