FR2993151A1 - APPLICATOR FOR COSMETIC PRODUCT AND ASSOCIATED APPLICATOR ASSEMBLY - Google Patents

Abstract

The invention relates to an applicator (4) for a cosmetic product comprising a brush (17), the brush (17) comprising: - a core (21) having a first end (23) adapted to be fixed to a rod (16) of applicator, and a free second end (24), the core (21) comprising a bulged portion (25, 26), an internal cavity (28) within the bulged portion, and an end port (24); 29) located at the second end (24) and communicating with the internal cavity (28), and - a plurality of protuberances (22) projecting from the web (21), wherein when the applicator (4) is moved through a spin ring (10), the bulged portion (25, 26) is adapted to be successively compressed to reduce the volume of the internal cavity (28), and then expanded to increase the volume of the cavity (28) so as to suck through the end port (29) a residue of cosmetic product lying on the xth end (24).

Description

FIELD OF THE INVENTION The invention relates to an applicator for a cosmetic product and an associated applicator assembly.

STATE OF THE ART Cosmetic product applicator assemblies are known, in particular for a cosmetic product intended to be applied to the eyelashes, such as mascara, comprising a container containing the cosmetic product and an applicator adapted to be fixed in a removable manner to the recipient. The container generally comprises a body, the body comprising walls defining a reservoir in which the cosmetic product is contained, and a neck defining an opening through which the cosmetic product can be extracted. The applicator generally comprises a cap as a handle and adapted to be attached to the neck, a stem extending from the plug and a brush attached to a free end of the stem. The brush comprises a core and a plurality of protuberances or bristles extending from the core. When the stopper is attached to the neck, the rod and the brush extend into the reservoir. The brush is immersed in the cosmetic product contained in the reservoir. To use the applicator, the user detaches the neck cap and extracts the applicator from the container. In order to prevent the brush from being overloaded with cosmetic product, the container generally comprises a spin ring, fixed inside the neck. When the user extracts the applicator from the container, the applicator slides inside the spin ring. The spin ring scrapes the excess cosmetic product onto the shaft and the brush. The spin ring thus makes it possible to adjust the amount of product present on the brush and avoids excessive application of cosmetic product on the eyelashes.

However, the spin ring does not remove the excess cosmetic product present on the end of the brush. Thus, a cosmetic product residue can remain on the end of the brush, which is unattractive and can affect the quality of the application of the cosmetic product. SUMMARY OF THE INVENTION An object of the invention is to limit the deposition of cosmetic product on the end of the brush. This problem is solved within the scope of the present invention by an applicator for a cosmetic product comprising a brush, the brush comprising: a core having a first end adapted to be fixed to an applicator rod, and a second free end the core comprising a bulged portion, an internal cavity within the bulged portion, and an end port at the second end communicating with the internal cavity, and a plurality of protuberances extending protruding from the core, wherein when the applicator is moved through a spin ring, the bulged portion is adapted to be successively compressed to decrease the volume of the internal cavity, and then expanded to increase the volume of the the inner cavity so as to suck through the end port a cosmetic product residue on the second end. The proposed applicator makes it possible to limit the presence of cosmetic product residue at the end of the brush. Thus, the brush remains clean and the cosmetic product can be applied to the eyelashes with good accuracy and without overload. The applicator may furthermore have the following features: the bulged portion comprises a wall having at least one lateral opening for imparting flexibility to the bulged portion; the opening has an elongate shape in a longitudinal direction of the core, - the wall of the bulging portion comprises a plurality of lateral openings, - the lateral openings face each other in pairs, - the core comprises two bulged portions, - the core comprises a thinned portion, - the brush comprises protuberances projecting from the bulged portion with a first density, and protuberances projecting from the thinned portion with a second density, greater than the first density, - the brush comprises protuberances extending projecting from the thinned portion, the protuberances having a half-cone shape, these protuberances are positioned so that flat surfaces of two adjacent protuberances are oriented in opposite directions. The invention also relates to an applicator assembly for a cosmetic product, comprising: - a container comprising a body forming a reservoir containing the cosmetic product, and - an applicator as defined previously adapted to be fixed on the container, so that the brush is housed inside the tank. PRESENTATION OF THE FIGURES Other features and advantages will become apparent from the description which follows, which is purely illustrative and non-limiting and should be read with reference to the appended figures, in which: FIG. 1 schematically represents a set of FIGS. Applicator according to one embodiment of the invention, - Figure 2A schematically shows a brush in side view, according to a first side; - Figure 2B is a detail view of the brush of Figure 2A, Figure 3A schematically shows the brush in side view on a second side; Figure 3B is a detail view of the brush of Figure 3A; Figure 4 is a schematic representation of a brush in view. 5 schematically represents the brush in sectional view along a longitudinal sectional plane AA; FIG. 6A schematically represents the brush in sectional view in FIG. In longitudinal section B-B, FIG. 6B is a detail view of the brush of FIG. 6A. DETAILED DESCRIPTION OF AN EMBODIMENT In FIG. 1, the applicator assembly 1 shown comprises a container 2 containing a cosmetic product 3 and an applicator 4 adapted to be removably attached to the container 2. The container 2 comprises a body 5 and a neck 6. The body 5 has a generally elongate shape and comprises walls 7 defining a reservoir 8 in which the cosmetic product is contained. The neck 6 comprises an outer surface 9 having a thread. The container 2 also includes a spin ring 10. The wiper ring 10 is positioned within the neck 6. The wiper ring 10 has a generally tubular shape. The spin ring 10 comprises a cylindrical main portion 11 extending inside the neck 6, a shoulder 12 adapted to bear on a rim 13 of the neck 6 to lock the spin ring in the neck and a thinned portion 14 whose diameter decreases towards the inside of the tank 8. The applicator 4 comprises a handle 15, a rod 16 and a brush 17. The handle 15 comprises an internal surface 18 having a thread. The thread of the handle 15 is adapted to cooperate with the thread of the neck 6 so as to allow attachment of the applicator 4 on the container 2. In this way the handle 15 serves as a cap to seal the container 2 .

The rod 16 has an elongated cylindrical shape and includes a first end 19 fixed to the handle 15 and a second end 20 to which the brush 17 is attached. The brush 17 is formed of a single piece of material, for example by molding by injection of plastic material. The brush 17 is formed in one piece of material, by molding a suitable material chosen (for example) from: a thermoplastic polyester elastomer, such as a Hytrel® sold by DuPont, a thermoplastic polyurethane elastomer, such as a Pellethane® marketed by Dow, a blend of thermoplastic materials, such as T-BLEND® sold by TSRC, mainly comprising poly (styrene-butadiene-styrene) (SBS) or poly (styrene) ethylene-butylene-styrene) (SEBS), a low-density polyethylene (LDPE), or an ethylene-alpha-olefin copolymer, such as Exact® 15 sold by ExxonMobil. When the handle 15 is screwed onto the neck 6 of the container 2, the rod 16 and the brush 17 extend inside the reservoir 8, the brush 17 immersed in the cosmetic product. In use, the user unscrews the handle 15 of the neck 6 and 20 extracts the applicator 4 from the container 2. During this extraction, the applicator 4 slides through the spin ring 10. The displacement of the applicator 4 Through the wiper ring 10, the thinned portion 14 of the wiper ring 10 scrapes the excess cosmetic product present on the wand 16 and on the wiper 17. As shown in FIGS. 6B, the brush 17 comprises a core 21 extending in a longitudinal direction X of the brush 17 and a plurality of protuberances in the form of pins 22 projecting from the core 21 in substantially radial directions. The core 21 has a first end 23 adapted to be fixed on the applicator rod 16 and a second free end 24. In addition, the core 21 comprises a first bulged portion 25, a second bulged portion 26 and a thinned portion 27. The thinned portion 27 extends between the two bulged portions 25 and 26 along the X axis. Each bulged portion 25, 26 has a curved outer surface. The thinned portion 27 has an external surface in depression. Each bulged portion 25, 26 has a cross section (in a plane perpendicular to the X axis) having an outer diameter greater than the outer diameter of a cross section of the thinned portion 27. In addition, as shown in FIG. 5, the core 21 of the brush 17 is hollow. More specifically, the core 21 comprises a longitudinal channel 28 formed inside the core 21 and extending along the longitudinal direction X of the core 21 of the first end 23 to the second end 24. The longitudinal channel 28 forms an internal cavity within the core 21. The channel 28 extends continuously through the first bulged portion 25, the thinned portion 27 and the second bulged portion 26 successively. In addition, the channel 28 opens at the second end 24 through an end port 29. As shown in Figure 6A, the bulged portions 25 and 26 each have a wall 57 and 58 surrounding the longitudinal channel 28 and having a first thickness E. The thinned portion 27 has a wall 59 surrounding the longitudinal channel 28 and having a second thickness e, less than the first thickness. Each enlarged portion 25, 26 of the core 21 comprises a plurality of lateral openings 30 to 33 and 34 to 37 respectively, while the thinned portion 27 of the core 21 is devoid of lateral openings. Each side opening 30 to 37 has an elongate (or oblong) shape and extends in a direction parallel to the longitudinal direction X of the brush. The side openings 30 to 37 provide the bulged portions 25, 26 with flexibility, which allows the bulged portions to deform when urged by the wiper ring of the container 2 as the brush 17 passes therethrough. the spin ring ..

The lateral openings 30 to 33 and 34 to 37 are distributed around the core 21, being angularly spaced at a constant angle between two successive lateral openings. More specifically, in the embodiment illustrated in the figures, each bulged portion 25 and 26 comprises four lateral openings respectively 30 to 33 and 34 to 37. The lateral openings 30 to 33 and 34 to 37, respectively, are spaced apart with an interval angular 90 degrees. The side openings 30 to 33 and 34 to 37 communicate with the longitudinal channel 28, thereby promoting penetration and circulation of the cosmetic product within the brush 17. In addition, the side openings 30 to 33 and 34 to 37 face each other in pairs, so that the soul 21 can be traversed laterally by the light. This feature allows the user to better perceive the reliefs of the brush 17. Moreover, the brush 17 comprises several longitudinal rows of pins, including rows 38 to 45 of thick pins and rows 46 to 53 of fine pins. More specifically, the brush comprises eight rows 38 to 45 of thick pins and eight rows 46 to 53 of fine pins. Each thick picot has a general cone shape. Each row 37 to 45 of thick pins extends substantially parallel to the longitudinal direction X of the brush 17 continuously along the first enlarged portion 25, the thinned portion 27 and the second enlarged portion 26. As shown in FIG. this is visible in FIGS. 2A and 3A, the rows 38 to 45 of thick spikes are arranged in pairs, and the rows of one and the same pair extend on either side of the lateral openings 30 to 33 and 34 to 37 symmetrically with respect to these openings. In addition, the brush 17 comprises, between two successive lateral openings 30, two rows of thick pins. The thick pins of one row are staggered with the thick pins of the adjacent row. Each row 46 to 53 of fine pins extends parallel to the longitudinal direction X of the brush 17, only along the thinned portion 27 of the core 21. The rows 46 to 53 of fine pins located on the thinned portion 27 extend in the extension of the lateral openings 30 to 33 and 34 to 37 of the bulged portions 25, 26. Thus, the density of spikes at the thinned portion 27 is greater than the density of spikes at the bulged portions 25 and 26. The presence of higher pin density provides better lash combing at the thinned portion and avoids excess formula in the middle of the brush. Moreover, as illustrated in FIGS. 2B and 2C, each fine pin has a half-cone shape, with a planar face 55 and a curved face 56. The rows 46 to 53 of fine pins are arranged in pairs, with the curved faces 54 pimples of two adjacent rows facing each other. In other words, the flat faces 55 of the pins of two adjacent rows are oriented in opposite directions. This provision of the spikes facilitates the molding of the brush, since it is permissible to use a mold with drawers of greater thickness than if the spikes were arranged with their flat faces facing each other. Furthermore, the pins extending from the thinned portion 27 of the core 21 are oriented in radial directions with respect to the longitudinal direction X of the brush 17, while the pins extending from the portions bulges 25, 26 of the core 21, form a non-zero angle with the radial directions. In particular, as can be seen in FIG. 6B, the spikes extending from a bulged portion 25, 26 form an angle of about 10 degrees with the radial direction. This arrangement of the pins on the bulged portions 25, 26, allows a better separation of the eyelashes on the sides of the brush during the application of the cosmetic product. In use, when the applicator is removed from the container, the brush 17 slides through the wiper ring 10. The first bulged portion 25, the thinned portion 27 and the second bulged portion 26 slide successively through the ring. spin 10.

The dimensions of the wiper ring 10 are such that, during its passage through the wiper ring, each bulged portion 25, 26 is successively compressed and then expanded. The bulged portion 25 (respectively 26) is first compressed, which has the effect of deforming the bulged portion by decreasing the volume of the internal cavity 28 of the core 21. This has the consequence of driving out the cosmetic product contained in the inner cavity through the lateral openings 30 to 33 (respectively 34 to 47) and the end port 29; This makes it possible to avoid taking too large a quantity of cosmetic product, without, however, completely eliminating the cosmetic product contained inside the internal cavity 28. Once passed through the spin ring 10, the bulged portion 25 ( respectively 26) tends to spontaneously return to its original shape because of its elasticity. The bulged portion expands, which has the effect of increasing the volume of the internal cavity 28. The increase in the volume of the internal cavity 28 creates a depression inside the cavity 28 so that any residue of cosmetic product that would have deposited on the second end 24 of the brush 17 is sucked through the orifice 29 towards the inside of the internal cavity 28.

The brush 17 remains clean and the cosmetic product can be applied to the eyelashes with good accuracy and without overloading.

Claims (11)

REVENDICATIONS1. An applicator (4) for a cosmetic product comprising a brush (17), the brush (17) comprising: - a core (21) having a first end (23) adapted to be attached to an applicator rod (16), and a second end (24) free, the core (21) comprising a bulged portion (25, 26), an internal cavity (28) within the bulged portion, and an end port (29) located at the second end (24) and communicating with the inner cavity (28), and - a plurality of protuberances (22) projecting from the web (21), wherein when the applicator (4) is moved through a wiper ring (10), the bulged portion (25, 26) is adapted to be successively compressed to reduce the volume of the internal cavity (28), and then expanded to increase the volume of the internal cavity (28) so as to suck through the end port (29) a cosmetic product residue on the second end (24). 2. An applicator according to claim 1, wherein the bulged portion (25, 26) comprises a wall (57, 58) having at least one side opening (30-33, 34-37) to impart flexibility to the portion bulging (25, 26). The applicator of claim 2, wherein the aperture (30-33, 3437) has an elongate shape in a longitudinal direction of the web (21). 4. Applicator according to one of claims 2 and 3, wherein the wall (57, 58) of the bulged portion (25, 26) comprises a plurality of side openings (30-33, 34-37). 30 The applicator of claim 4, wherein the side openings (30-33, 34-37) face each other in pairs. 2 9 9 3 1 5 1 11 6. Applicator according to one of claims 1 to 5, wherein the core (21) comprises two bulged portions (25, 26). 7. Applicator according to one of claims 1 to 6, wherein the core (21) 5 comprises a thinned portion (27). An applicator according to claim 7, wherein the brush (17) comprises protuberances (22) projecting from the bulged portion (25, 26) with a first density, and protuberances (22) extending protrusion 10 of the thinned portion (27) with a second density, greater than the first density. 9. The applicator according to one of claims 7 and 8, wherein the brush (17) comprises protuberances (46-53) projecting from the thinned portion (27), the protuberances having a shape of half. cone. The applicator of claim 9, wherein the protuberances (4653) are positioned so that flat surfaces (55) of two adjacent protuberances are oriented in opposite directions. 20 11. Applicator assembly (1) for cosmetic product, comprising: - a container (2) comprising a body (5) forming a reservoir (8) containing the cosmetic product (3), and - an applicator (4) according to one Claims 1 to 10 adapted to be fixed on the container (2), so that the brush (17) is housed inside the container (8).