HOUSING FOR A POWDERY COSMETIC PRODUCT

Abstract

The invention relates to a casing (1) for a powdered cosmetic product (P). The casing (1) has a central axis (X) and comprises an insert (10) fixed to the lid. The insert comprises a sealing base (13) bearing against a sieve in the screwed position of the lid, the sealing base (13) of the insert comprising a first annular contact element (15) proximal to a central window closed by a grid (9a) bearing flat on a central region (13a) of the sealing base, and a second annular contact element (16) distal to the central window, the first and second annular contact elements being distinct and bearing flat on an upper wall (7a) of the annular support of the sieve when the lid is in the screwed position, so as to obtain a double radially external seal of the central window (8). Figure for abstract: Fig. 1

Description

Title of the invention: HOUSING FOR A POWDERY COSMETIC PRODUCT Technical field of the invention

[0001] The present invention relates to a casing for a powdered cosmetic product.

[0002] The cosmetic product is said to be powdery because it is in the form of a loose powder, particularly used for makeup. The cosmetic product therefore has a natural tendency to disperse. Technical background

[0003] Various examples of the design of cases intended to receive a powdered cosmetic product, such as loose powder or other similar products used for makeup, are known from the state of the art.

[0004] The casings for powdered cosmetic products according to the prior art typically comprise a base comprising a cavity for receiving the powdered cosmetic product, the cavity opening axially through an opening, a screen arranged in the opening so as to close the cavity and comprising an annular support defining a central window closed by a grid and a cover for closing the casing which is intended to be screwed onto the base between an unscrewed position and a screwed position ensuring the sealed closure of the opening. In order to prevent the powdered product from discharging in an uncontrolled manner from the receiving cavity, for example during transport, and to prevent the cleanliness of the casing from being called into question, solutions have been proposed in the prior art.

[0005] A first solution consisted of placing and firmly pressing a sponge against the grid. However, when the sponge was extracted, suction was produced by the suction cup effect and the sponge ended up with an excessive quantity of cosmetic product on its side facing the grid.

[0006] A second solution consisted of using a cap intended to cover the sieve so as to isolate the latter and prevent the dispersion of the cosmetic product. However, once the case had been used at least once by the user, the sieve was covered with powder and the cap lost its interest since it did not have the capacity to clean the surface of the sieve.

[0007] According to a third solution, the housing comprises a deformable membrane having a face facing the sieve, this deformable membrane being capable of matching the shape of the sieve during the screwing of the cover. The face facing the sieve comprises raised elements allowing the sieve to be cleaned by rubbing, which is particularly useful after the first use of the housing. However, this solution did not allow sufficient sealing to be obtained since traces of powder could still be found outside the cavity, which could harm the user's perception of the product.

[0008] Recently, therefore, cases for powdered cosmetic products have been proposed, comprising an insert fixed to the lid which comprises a sealing base bearing against the sieve in the intended position of the lid.

[0009] Document CN211559073 proposes such a casing for a powdered cosmetic product. In this casing, the insert has a mushroom shape in which, by analogy with the shape of the mushroom, it comprises a cap corresponding to an upper insert portion fixed to the lid, and a foot corresponding to a lower insert portion in contact with the sieve and a rim of the opening in which the sieve is arranged. The cap is made of a rigid material while the foot is made of a flexible material. Thus, when the lid is screwed onto the base of the casing, the insert deforms by matching the contours of the rim and the sieve, which makes it possible to seal the lid. To obtain this difference in modulus of elasticity between the two parts of the insert, the latter is designed in two materials. However, this prevents any recycling of the insert. In addition, this significantly complicates the manufacturing process of the insert.

[0010] Document EP2454964 proposes a case for a cosmetic product in which the insert is entirely rigid. The insert comprises, still by analogy with a mushroom, a foot comprising an annular sealing foot 151 and a sealing bottom 152 formed in the sealing foot 151. The sealing bottom 152 is intended to be in contact with the sieve and makes it possible to prevent the discharge of the powdered cosmetic product. The annular sealing foot 151 comprises a protrusion extending in the closing axis of the cover which is configured to bear on a rim of the opening in which the sieve is arranged. Thus, when the cover 3 is screwed onto the base 2 of the case, the sealing bottom 152 forms a first sealing zone while the annular sealing foot 151 forms a second sealing zone. The cover 3 further comprises an annular projection 141 which makes it possible to generate a high sealing zone with the base 2.Although the solution proposed in this document aims to improve sealing, the powder discharge portion 132 is recessed to a predetermined depth relative to an upper surface of the bottom of the center cap by a sealing step 133 and, when the sealing bottom 152 is mounted in the sealing step 133, a gap is formed between the sealing bottom 152 and the powder discharge portion 132. However, the product tends to stagnate in this gap. In addition, this gap promotes the dispersion of the product in the rest of the housing and the sealing foot alone does not prevent this.

[0011] The present invention provides a solution to at least some of the problems mentioned above. Summary of the invention

[0012] The invention provides a housing for a powdered cosmetic product, the housing having a central axis and comprising:

[0013] - a base comprising a cavity for receiving the powdered cosmetic product, the cavity opening axially through an opening,

[0014] - a screen arranged in the opening so as to close the cavity and comprising a annular support defining a central window closed by a grid,

[0015] - a closing cover of the housing which is intended to be screwed onto the base between a unscrewed position and a screwed position ensuring the tight closure of the opening,

[0016] - an insert fixed to the cover and comprising a sealing base coming into contact against the sieve in the screwed position of the cover.

[0017] The housing is characterized in that the grid bears flat on a central region of the sealing bottom and in that the sealing bottom of the insert comprises a first annular contact element proximal to the central window and a second annular contact element distal to the central window, the first and second annular contact elements being distinct and bearing flat on an upper wall of the annular support of the screen when the cover is in the screwed position, so as to obtain a double radially external seal of the central window.

[0018] The casing for a powdery cosmetic product according to the invention has improved radial sealing compared to the casings of the prior art. Indeed, it comprises a first annular contact element proximal to the central window and a second annular contact element distal to the central window. Although these two distinct elements each allow the lid to be sealed individually, their arrangement creates a double barrier for the powdery product passing through the sieve. Indeed, if a portion of the powdery product passes through the first annular contact element, it is blocked radially by the second annular contact element. Thus, when the user opens the lid, no trace of dirt can be seen and the user's perception of the product is not impaired.

[0019] According to different characteristics of the invention which can be taken together or separately: • The grid is flush with the upper wall of the annular sieve support; • said first annular contact element consists of a deformable and continuous excess thickness; • the second annular contact element consists of an annular rib; • said annular rib consists of a fold of the sealing bottom; • the first annular contact element is separated from the second annular contact element by a gap extending over a radial distance of between 5% and 20% of a radius of the sealing bottom of the insert, preferably between 10% and 15% of the radius; • a section of the sealing bottom defined between the first and second annular contact element is flexible; • the grid is flush with the upper wall of the annular support of the screen so as to be in plane support on a central region of the sealing base; • the grid is fixed in the sieve by wedging between the annular support and a counter-support fixed under the annular support, said counter-support having a central return entering the central window so as to raise the grid to the level of the upper wall of the annular support of the sieve; • the grid is fixed in the sieve by wedging between the annular support and a counter-support fixed under the annular support, said counter-support having a central return entering the central window so as to raise said grid; • the base, ring support, cover and insert are made of polypropylene; • the base, ring support, cover and insert are made of polyethylene terephthalate ethylene; • the case is made of a single material; • the case is made of polypropylene; • the insert is designed in a single material and has a single modulus of elasticity; • the central region of the sealing base includes reinforcing ribs for flat support of the sealing base on the grid; • the insert is clipped to the cover by additional fixing means. Brief description of the figures

[0020] Other objects, characteristics and advantages of the invention will appear more clearly in the description which follows, made with reference to the appended figures, in which:

[0021] - [Fig. 1] is a sectional view of a housing according to one embodiment of the present invention,

[0022] - [Fig.2] is an exploded view of the housing illustrated in [Fig.l],

[0023] - [Fig.3] is a close-up view of the housing according to a first variant of the rea illustration illustrating a cover, an insert and a sieve,

[0024] - [Fig.4] is a close-up view of the housing according to a second variant of the rea illustration showing the cover, insert and sieve,

[0025] - [Fig.5] is a close-up view of the housing according to an alternative embodiment illustrating the lid, insert and sieve. Detailed description of the invention

[0026] [Fig. 1] illustrates a housing 1 for a powdered cosmetic product P having a central axis X.

[0027] In the present application, the terms "axial", "axially", "radial" and "radially" are defined with respect to the central axis X.

[0028] The terms "upper" and "lower" are used as geometric references in relation to the axial orientation as shown in the figures and independently of the direction of Earth's gravity.

[0029] As mentioned in the preamble to this description, the cosmetic product P is said to be powdery because it is in the form of a loose powder, used in particular for makeup. The cosmetic product therefore has a natural tendency to disperse. Conventionally, the powder particles of the powdery cosmetic product P generally have an average diameter of between 2 μm and 100 μm. These powder particles can therefore easily infiltrate the various recesses of the housing. The housing 1 according to the invention makes it possible to prevent any infiltration of the particles of the powdery cosmetic product into the areas exposed to the user's view.

[0030] The housing 1 comprises a base 2 having a cavity 3 for receiving the powdered cosmetic product P. This cavity 3 opens axially through an opening 4. The housing 1 also comprises a cover 5 for closing the housing 1 which is intended to be screwed onto a neck of the base 2 so as to ensure a sealed closure of the opening 4. The cover 5 is mounted so as to be able to move on the base 2 between an unscrewed position, in which it does not seal the opening 4, and a screwed position in which it seals the opening 4. Thus, any position of the cover 5 in which it does not seal the opening is associated with an unscrewed position. In [Fig.l], the cover 5 is in the screwed position.

[0031] All the parts making up the housing 1 are cylindrical parts of revolution around the central axis X. The receiving cavity 3 is delimited axially by a bottom 20 of the base 2, and delimited radially by a peripheral annular wall 21 of the base extending from the bottom 20. The base 2 thus makes it possible to receive the powdered cosmetic product P. The peripheral annular wall 21 comprises an upper end 22 corresponding to the neck of the base provided with a first external helical rib 23, called a screw thread, and onto which the cover 5 can be screwed. In this respect, the cover 5 comprises a second helical rib 24 capable of cooperating with the first helical rib 23 to allow a fitting, without play, from cover 5 to base 2.

[0032] The housing 1 further comprises a screen 9 arranged in the opening 4 so as to close the cavity 3. In the embodiment illustrated in the figures, the screen 9 has a general dome shape. It comprises means for fixing to the base. These fixing means consist of a first end 25 fixed to the base 2. The screen 9 comprises, at its first end 25, an annular attachment tab 27 in which the upper end 22 of the base is fitted. The screen 9 is thus rigidly fixed to the base 2.

[0033] Furthermore, the sieve 9 comprises an annular support 7, located inside the receiving cavity 3, and which defines a central window 8 closed by a grid 9a. The grid 9a is, so to speak, the active part of the sieve 9. It comprises a set of meshes (not visible) forming a set of orifices for the passage of the powdery cosmetic product P out of the receiving cavity 3. Each passage orifice advantageously has dimensions significantly larger than those of the particles making up the powdery cosmetic product P, that is to say that each of the passage orifices has dimensions at least one order of magnitude larger than those of said particles.

[0034] The housing 1 further comprises an insert 10 fixed to the cover 5 which comprises a sealing bottom 13 bearing against the sieve 9 when the cover 5 is in the screwed position. More precisely, the sealing bottom of the insert 10 bears against the annular support 7 of the sieve 9. As will be better described below, it is by means of the insert 10 that the present invention proposes to prevent the infiltration of the powdery cosmetic product P into areas 31 of the sieve 9 where its presence is not desired. These areas 31 are parts of the sieve 9 which are visible to the user and likely to be covered with powdery cosmetic product if sufficient sealing is not ensured.

[0035] As illustrated in Figures 1 and 2, the insert 10 has, like the sieve 9, a general dome shape. The insert 10 comprises a first axial end 14 fixed to the cover 5 and the sealing bottom 13 placed on the annular support 7 of the sieve 9. The first axial end 14 and the cover 5 comprise complementary means 29, 30 for fixing the insert 10 to the cover 5. The complementary fixing means may consist of a clip which makes it possible to stiffen the assembly of the insert 10 and the cover 5. Other means for fixing the insert 10 to the cover 5 may be envisaged within the framework of the present invention.

[0036] With reference to [Fig. 3], the housing 1 according to the invention is distinguished from the housings of the prior art in that the grid 9a is in plane support on a central region 13a of the sealing bottom 13 and in that the sealing bottom 13 of the insert 10 comprises a first annular contact element 15 proximal to the central window 8 and a second annular contact element 16 distal to the central window 8, the first 15 and second 16 annular contact elements being distinct and in plane support on an upper wall 7a of the annular support 7 when the cover 8 is in the screwed position so as to obtain a double radially external seal of the central window 8.

[0037] Advantageously, the grid 9a is flush with an upper wall 7a of the annular support 7 of the sieve 9

[0038] The first annular contact element 15 is proximal to the central window 8 and provides a first radially external seal of the central window 8. The second annular contact element 16 is distal to the central window 8. It is therefore further from the central window 8 than the first annular contact element 15. The second annular contact element 16 thus provides a second radially external seal of the central window 8.

[0039] The housing 1 according to the invention therefore provides a double radially external seal of the central window 8 by means of the first 15 and second 16 annular contact elements. Thus, when the powdered cosmetic product P passes through the grid 9a, located at the central window 8, it cannot use the recesses to infiltrate and reach the zones 31 of the sieve 9 where its presence is not desired. Whatever the orientation that the user gives to the housing 1, the double radial seal provided at the interface between the sealing bottom 13 of the insert 10 and the upper wall 7a of the annular support 7 makes it possible to guarantee that the powdered cosmetic product P can be dispensed through the grid 9a without infiltrating into the recesses of the housing 1.

[0040] Advantageously, the first annular contact element 15 consists of a deformable and continuous excess thickness 15. Thus, when the cover 5 is screwed onto the base 2, the insert 10 exerts greater pressure on the upper wall 7a of the annular support 7 at the location of the deformable and continuous excess thickness 15. Since the excess thickness 15 is deformable, the force exerted on the upper wall 7a creates a plane contact, and not just a point contact, between the excess thickness 15 and the upper wall 7a. Furthermore, since the excess thickness 15 is continuous, this plane contact is annular and continuous around the central window 8. This annular plane contact acts as a first barrier to limit the infiltration of the powdered cosmetic product P into the areas 31 of the sieve 9 where its presence is not desired.

[0041] Also advantageously, the second annular contact element 16 consists of an annular rib 16. As previously indicated, the second contact element 16 is further from the central window 8 than the first annular contact element 15. Incidentally, this annular rib 16 is further from the central window 8 than the first contact element 15, in this case from the thickness 15. When the cover 5 is screwed onto the base 2, the insert 10 exerts greater pressure on the upper wall 7a of the annular support 7 at the level of the annular rib 16. Like the deformable and continuous excess thickness 15, the annular rib 16 is in continuous annular plane contact around the central window 8. This annular plane contact acts as a second barrier to prevent the infiltration of particles of the powdered cosmetic product P which have managed to pass through the first annular contact element 15 into the zones 31 of the sieve 9 where their presence is not desired. The annular rib 16 therefore provides a second radially external seal around the grid 9a.

[0042] The plane contact being located between the cover 5 and the annular support 7, it ensures a watertight closure of the opening 4, and notably the watertightness of the housing 1 with respect to the exterior.

[0043] Preferably, the annular rib 16 consists of a fold of the sealing bottom 13. In other words, the annular rib 16 is formed by a corrugation of the sealing bottom 13, which makes it deformable without having to modify the thickness, the density or the modulus of elasticity of the sealing bottom 13. In the embodiment illustrated in [Fig. 3], this fold of the sealing bottom 13 generates a projection in the direction of the upper wall 7a of the annular support 7 which flattens when the cover 5 is screwed onto the base 2. By flattening, the fold generates a force which is exerted on a larger annular contact surface against the annular support 7a in comparison with a situation where the annular rib 16 would be parallelepipedal.

[0044] With reference to Figures 4 and 5, according to a preferred embodiment, a gap 17 is created between the sealing bottom 13 and the annular support 7, and more precisely still between the two sealing zones, i.e. between the first annular contact element 15 and the second annular contact element 16. This gap 17 extends over a radial distance D of between 5% and 20% of a radius R of the sealing bottom 13 of the insert, preferably between 10% and 15% of the radius R. The presence of this gap 17 between the first 15 and second 16 annular contact elements allows the second contact element 17 to have enough space to be able to deform without this deformation being altered by the presence of the first annular contact element 15. Thus, the first 15 and second 16 annular contact elements can deform simultaneously independently of each other.

[0045] It is preferable that the radial distance D over which the gap 17 extends is at least 5% of the radius R of the sealing bottom 13 so that these deformation movements remain independent of one another. Concomitantly, it is preferable that the radial distance D over which the gap 17 extends does not exceed 20% of the radius R of the sealing bottom 13 so as not to leave the powdery cosmetic product P the possibility of reforming a cluster of particles between the first contact element 15 and the second contact element 16. Indeed, this would harm the double sealing effect which is obtained by the housing 1 according to the invention. This being the case, it is preferable that the radial distance D over which the gap 17 extends is between 10% and 15% of the radius R of the sealing bottom 13. This makes it possible to obtain an optimal double deformation, with deformations independent of each other, while avoiding as much as possible the aforementioned material accumulation effect.

[0046] Incidentally, a section 18 of the sealing bottom 13 defined between the first 15 annular contact element and the second annular contact element 16 is flexible. This flexibility makes it possible to guarantee long-term operation of the double seal provided by the housing 1 according to the invention by ensuring controlled and repeatable movements of the first annular contact element 15 and the second annular contact element 16.

[0047] According to an advantageous implementation, the central region 13a of the sealing bottom comprises reinforcing ribs 14 for a flat support of the sealing bottom on the grid 9a. These reinforcing ribs 14 make it possible to stiffen the central region 13a, which makes it possible to avoid lateral deformations of the sealing bottom 13 when the cover is screwed onto the base 2. Thus, bending of the central region 13a of the sealing bottom is avoided due to the pressure generated when screwing the cover 5, and the double sealing effect produced by the first 15 and second 16 contact elements is avoided from being degraded.

[0048] At this stage, it can be specified that the central region 13a designates the part of the sealing bottom 13 which is not supported on the upper wall 7a and which is located radially internal to the part of the sealing bottom 13 which is opposite the upper wall 7a. This latter part of the sealing bottom 13 is the peripheral region 13b of the sealing bottom 13.

[0049] When the grid 9a is thus arranged, the central region 13a of the sealing bottom remains flat, that is to say that it does not have any undulation. This makes it possible to avoid a curvature of the sealing bottom 13 when the cover 5 is screwed onto the base 2. Indeed, the central window 8 is bordered by the annular support 7 on which the sealing bottom 13 bears when the cover 5 is screwed onto the base 2. Thus, when the grid 9a is positioned below the upper wall 7a of the annular support 7, the sealing bottom 13 ends up bending in contact with the upper wall, in particular at the interface between its central region 13a and its peripheral region 13b, when the cover 5 is screwed onto the base 2. The bend resulting from this deformation can be detrimental to the seal.When the grid 9a is flush with the upper wall 7a of the annular support 7, the central region 13a of the sealing bottom 13 remains flat since the grid 9a, which is arranged in the central window 9a, is at the same level as the upper wall 7a.

[0050] In this regard, as illustrated in [Fig. 3], the grid 9a can be fixed in the sieve 9 by wedging between the annular support 7 and a counter-support 32 fixed under the annular support 7. In this particular implementation, the counter-support 32 has a central return 33 entering the central window 8 so as to raise the grid 9a to the level of the upper wall 7a of the annular support 7 of the sieve 9. In this respect, the central return 33 penetrates into the central window 8 over a suitable distance so that the grid 9a is flush with the upper wall 7a of the annular support 7 once resting on the central return 33. In practice, the grid 9a comprises an elbow which follows the contour of the counter-support 32 so that the part of the grid 9a intended to be in contact with the sealing bottom 13 is at the same level, in other words aligned with the upper wall 7a.Furthermore, the screen 9 may comprise an annular space 11, formed between the counter-support 32 and the annular support 7, in which said grid 9a can be inserted and wedged. This makes it possible to guarantee the stability of the grid 9a and, subsequently, that of the sealing bottom 13 when it is pressed on said grid 9a.

[0051] At this stage, it can be specified that by being thus arranged on the grid 9a, the sealing bottom also ensures a cleaning function of the grid 9a since it remains in contact with said grid 9a.

[0052] According to a preferred embodiment, the base 2, the annular support 7, the cover 5 and the insert 10 are made of the same plastic material. This avoids the user having to sort the different parts of his case 1, according to the materials, to be able to throw it into different sorting bins.

[0053] The plastic material may be chosen from polypropylene (PP), recycled polypropylene (R-PP), polyethylene terephthalate (PET), recycled polyethylene terephthalate (R-PET), a thermoplastic elastomer (TPE), polyethylene (PE), such as low density polyethylene (LDPE) and / or high density polyethylene (HDPE), a composite material, a post-consumer recycled material (PCR and / or a similar material). Preferably, the base 2, the annular support 7, the cover 5 and the insert 10 are made of recycled or non-recycled polypropylene and / or polyethylene terephthalate. The recycling of these elements of the housing 1 is facilitated in a well-known recycling cycle.

[0054] Preferably, the housing is made of a single material, i.e. it is monomaterial. Even more preferably, the housing 1 is made of polypropylene. Thus, the housing 1 can be easily recycled in a sector specifically dedicated to polypropylene. In this case also, the recycling of the housing 1 is facilitated in a well-known recycling cycle.

[0055] Thus, advantageously, the base 2, the annular support 7, the cover 5 and the insert 10 are made of plastic material chosen from polypropylene and / or polyethylene terephthalate.

[0056] The housing 1 can be produced by 3D printing.

[0057] In particular, the base 2, the annular support 7, the cover 5 and the insert 10 can be produced by 3D printing. Such a printing method makes it possible in particular to produce these parts very freely, presenting patterns and shapes contributing to the aesthetic appearance of the housing 1.

[0058] According to a variant in which the base 2, the annular support 7, the cover 5 and the insert 10 are made of different materials, the base 2 can be made of glass. This allows the user to see the inside of the housing 1, and in particular to see the powdered cosmetic product P, which is more aesthetic and also more practical. Indeed, a simple visual check makes it possible to know the level of product remaining in the housing 1.

[0059] Still according to a variant in which the base 2, the annular support 7, the cover 5 and the insert 10 are made of different materials, the cover 5 can be made of aluminum, which gives it lightness. This variant embodiment can be combined with that in which the base 2 is made of glass.

[0060] Moreover, the insert 10 can advantageously be designed in a single material having a single modulus of elasticity. The entire insert 10 therefore has the same rigidity, which facilitates its manufacture since it is not necessary to provide zones with different thicknesses and / or with different densities for the same material and / or having undergone a different treatment.

[0061] The configurations shown in the cited figures are only possible examples, in no way limiting, of the invention which on the contrary encompasses the design variants within the reach of those skilled in the art.

Claims

Claims

1. Housing (1) for a powdery cosmetic product (P), the housing (1) having a central axis (X) and comprising: - a base (2) comprising a cavity (3) for receiving the powdery cosmetic product (P), the cavity (3) opening axially through an opening (4), - a sieve (9) arranged in the opening (4) so as to close the cavity (3) and comprising an annular support (7) defining a central window (8) closed by a grid (9a), - a cover (5) for closing the housing (1) which is intended to be screwed onto the base (2) between an unscrewed position and a screwed position ensuring the sealed closure of the opening (4), - an insert (10) fixed to the cover (5) and comprising a sealing base (13) bearing against the sieve (9) in the screwed position of the cover (5);the housing (1) being characterized in that the grid (9a) is in plane support on a central region (13a) of the sealing bottom (13), and in that the sealing bottom (13) of the insert comprises a first annular contact element (15) proximal to the central window (8) and a second annular contact element (16) distal to the central window (8), the first and second annular contact elements (15, 16) being distinct and in plane support on an upper wall (7a) of the annular support (7) of the sieve (9) when the cover (5) is in the screwed position, so as to obtain a double radially external seal of the central window (8).;

2. Housing (1) according to claim 1, in which the grid (9a) is flush with the upper wall (7a) of the annular support (7) of the screen (9).

3. Housing (1) according to any one of claims 1 or 2, wherein said first annular contact element (15) consists of a deformable and continuous excess thickness (15).

4. Housing (1) according to any one of claims 1 to 3, wherein the second annular contact element (16) consists of an annular rib (16).

5. Housing (1) according to the preceding claim, in which said annular rib (16) consists of a fold of the sealing bottom (13).

6. Housing (1) according to any one of the preceding claims, in which the first annular contact element (15) is separate from the second annular contact element (16) by a gap (17) extending over a radial distance (D) between 5% and 20% of a radius (R) of the sealing bottom (13) of the insert, preferably between 10% and 15% of the radius (R).

7. Housing (1) according to the preceding claim, in which a section (18) of the sealing bottom defined between the first (15) and the second (16) annular contact element is flexible.

8. Housing (1) according to any one of the preceding claims, in which the grid (9a) is fixed in the screen (9) by wedging between the annular support (7) and a counter-support (32) fixed under the annular support (7), said counter-support (32) having a central return (33) entering the central window (8) so as to raise the grid (9a) to the level of the upper wall (7a) of the annular support (7) of the screen (9).

9. Housing (1) according to any one of claims 1 to 7, in which the grid (9a) is fixed in the screen (9) by wedging between the annular support (7) and a counter-support (22) fixed under the annular support (7), said counter-support (22) having a central return (23) entering the central window (8) so as to raise said grid (9a).

10. A housing (1) according to any preceding claim, wherein the base (2), the annular support (7), the cover (5) and the insert (10) are made of polypropylene (PP) and / or PET.

11. A housing (1) according to any preceding claim made of a single material.

12.

13. Housing (1) according to claim 11, made of polypropylene. Housing (1) according to any one of the preceding claims, in which the insert (10) is made of a single material and has a single modulus of elasticity.

14. Housing (1) according to any one of the preceding claims, in which the central region (13a) of the sealing base comprises reinforcing ribs (14) for flat support of the sealing base on the grid (9a).

15. Housing (1) according to any one of the preceding claims, in which the insert (10) is clipped to the cover (5) by complementary fixing means (29, 30).

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