MXPA97003925A - Flat-concave profile brush - Google Patents

Abstract

The invention relates to a brush (200) comprising a straight bar (201) defining a main axis (x-x), a flexible web (202), comprising a first and a second ends, first end being jointly involved with this bar, fibers (204) radially implanted in this web defining brush surface (205) fibers end, this surface including a first surface, any meridian plane intersection passing by main axis with brush surface defining two crestá(207) lines with a determined curvature, brush characterized in that web is curved, because crest (207) lines are concave, and because first surface (207,1) is sensitively straight and parallel to main axis (x-x).

Description

FLAT-CONCAVE PROFILE BRUSH FIELD OF THE INVENTION The present invention relates to a brush, in particular to a brush for applying a cosmetic on the keratin fibers, particularly for applying mascara on the eyelashes or a dye on the hair, as well as for a makeup device that includes this brush a profile sensibly flat-concave.

BACKGROUND OF THE INVENTION J! Usually, a brush for the application of a cosmetic product most often comprises an elongated core formed by the spiral winding of two arms of a metal wire, hairs and radially plated on this core and held between these wound arms. Such brushes can be of various shapes and include cut-outs. In the case in which these brushes are used to apply a mascara on the eyelashes, such shapes and such cutouts are provided to allow the obtaining of a more or less loaded make-up, an elongation, a more or less important curving of the eyelashes. It is known from the prior art, for example by the patent application FR-A 2715038, mascara applying brushes having any shape, in the REF: 24755 which has been cut a concave notch, in all its extension. The hairs of the concave notch, being short, are little drained at the exit of the reservoir containing the mask, such brushes provide a very heavy makeup. Brushes in the form of a bull fragment are also known, these brushes being obtained by the circular arc portion of the core of a cylindrical brush. Such brushes have a convex surface, a concave surface and two substantially planar surfaces. 'Such brushes are of an inconvenient handling. In effect, if the user makes the bar of said brush move around its axis between its fingers, in order to apply a product on the eyelashes for example, it must permanently rectify the distance of the brush with respect to the eyelashes. In addition, it has been observed that said brush loaded the eyelashes smoothing them little. The brushes obtained by twisting the circle of the core of a cylinder-conical brush have the same drawbacks. Although these brushes of the prior art provide generally satisfactory results, it seems desirable to have brushes that allow a good loading of the eyelashes by the brush to ensure good smoothing of the product and a good separation of the tabs by loading the lashes. of product to obtain a sophisticated makeup. The object of the invention is also to provide a brush that is simple and economical to apply and practical to use. The applicant firm has unexpectedly discovered new brushes for the application of a cosmetic product, which, when used to apply a mascara on the eyelashes, allows obtaining a sophisticated makeup of high quality, that is to say lightly loaded but very elongated with eyelashes very well separated, being on the other hand these very easy handling brushes. I DESCRIPTION OF THE INVENTION The object of the invention is a brush that acquires a straight bar defining a main axis, a flexible core, including two ends, joined by its first end to this bar, hairs implanted radically in this core, the end of the hairs defining the brush surface, including this surface a first surface, passing the intersection of any plane by the. main axis called meridian plane, by the surface of the brush that defines two curves called crest lines that have a certain curvature, this brush being characterized because the crest lines are concave, and because the first surface is fairly straight and parallel to the main axis .

By concave ridge lines, it is understood that its concavity is turned towards the outside of the brush.

The curvature of a ridge line is the inverse: 1 / r, of its radius of curvature r. At each point of the soul the interception of the surface of the brush with any plane perpendicular to the soul defines a section of the brush.

Preferably, the core is central relative to each brush section. The faces are longitudinal portions of the surface of the brush. Preferably, the surface of the brush includes at least a second face, called the maximum curvature face, characterized in that the curvature of the ridge lines passes through a maximum at the level of this second face. Preferably, the brush surface includes a single straight face. \ Preferably, the curvature of the lines of - _ | crest goes through a single maximum. Preferably, the curvature of the lines of ta is continuously increased from the straight surface to the maximum curvature surface. Preferably the surfaces of maximum and straight curvature are diametrically opposite with respect to the core. Preferably, the hairs of the same section are all of identical length. Another object of the invention is a method for manufacturing a brush according to the invention, characterized in that: a) a starting brush is taken including a straight bar defining a main axis, a flexible core, which includes a first and second ends, the first end being integral with this bar, the core being straight and in alignment with the bar, hairs being implanted radially in this core, the end of the hairs defining the surface of the starting brush, being the indicated surface of generally concave shape, like for example a brush and with the shape of a diabolo or of a peanut, passing the intersection of any meridian plane by the main axis, with the surface of the starting brush that defines two meridians, concave, with a curvature. { determined. b) a first step consisting in printing to the soul a torsion in a meridian plane, the indicated torsion being a curvature substantially equal to the curvature of one of the two meridians of this plane and with the opposite direction of the curvature of this meridian. At each point of the web, the intersection of the starting brush surface with any perpendicular plane to the web defines a section of the starting brush. Preferably, the starting brush is chosen in such a way that the core is central relative to each section of the starting brush. Thus the surface of the starting brush is modified: a meridian is transformed into a line of crest sensibly the curvature of the second meridian that belongs to the same meridian plane. The core remains central in relation to each section of the brush, however these sections are no longer parallel. Preferably, in a second step, a torsion is imparted to the end of the core which is integral with the bar in order to align the second end of the core with the main axis. Thus, the brush according to the invention can be used with a mascara container provided with a drainer of usual design. Preferably, one of the meridian planes of the | The starting brush surface is a plane of symmetry * j-of the starting brush. Eventually, the split brush comprises a plane of symmetry perpendicular to the axis of the core. Still more preferably the surface this starting brush is of revolution. Advantageously, each section of the starting brush is convex. This brush is completely suitable for the fastening of the eyelashes, the invention also having as its object a makeup device comprising a mascara container and a mascara application organ, this application organ being a brush according to the invention. The brush according to the invention has a continuous evorative profile of flat-concave in relation to its main axis; when the brush performs a turn around its main axis, for example when the user rotates the brush bar according to the invention between his fingers, the same evolves from a plainly plane face surrounding the straight crest line parallel to the axis main to a concave surface with radius of increasing curvature to reach a maximum curvature then decrease and return to a flat face. The substantially planar profile is preferably diametrically opposite to the concavity of the brush. in relation to the soul. Each section to be perpendicular to the soul at any point of this, the brush hairs have a lower density compared to the rest of the brush along this flat profile. In addition, these hairs diverge. Preferably, the surface diametrically opposite to the straight surface in relation to the core, is the one that presents the most important curvature. Thus, this surface has a much less important hair density and these hairs converge. When the user uses this brush to apply a makeup product on the eyelashes, he removes the brush from the product reservoir, which passes through a drainer. When the hairs of the same section have all the same length, they are all drained. However, the surface comprising a substantially flat profile is better drained because the hairs diverge and are not very dense. The surface that presents the most important curvature is on the contrary very little drained because the distribution of hairs is very dense. The user places the brush against the eyelashes and rotates it between his fingers; This smooths, curves and separates the lashes by its flat profile, then the product load for the rest of its surface. The obtained makeup is loaded, stretched, recurved.; | In addition, the bristles of the brushes according to the invention can be of any kind, hairs of different lengths, of different diameters or of different section and of different materials, hairs with sharp ends, in the form of a fork or of a pin head, or having experienced any type of treatment known to the person skilled in the art. It can also be envisaged that the brush according to the invention includes an alternation of rows of short hairs and long hairs, the long hairs being the only ones taken into account to define the surface of the brush. A variant of this type of the invention makes it possible to accentuate the loading of the product flange by the brush of the invention. The helical winding of the two arms of the metal wire forming the core can be provided with a step to the right, as is usually provided in the manufacture of make-up brushes, or a step to the left, as shown by request Patent FR-A-270119 8. In order to manufacture a brush with pitch to the left, the arms of the core are twisted by turning left to form turns that rotate clockwise around which the rod progresses towards the end of the brush. brush. The brush with a step to the left is preferred - for the realization of brushes according to the invention; This box provides the hair strands with an orientation that allows better separation of the lashes during maqui lation. The invention consists, apart from the provisions set forth above, in a number of other provisions of which will be more explicitly discussed in connection with exemplary embodiments described with reference to the accompanying drawings, but which are by no means limiting. Figures IA and IB are perspective views of a brush that can be used to manufacture a brush according to the invention. Figures 2A and 2B are perspective views of a brush according to the invention made from the brush represented in Figure 1. - li ¬ Figure 3 is a perspective view of a brush that can be used to make a brush according to the invention. Figure 4A and 4B are perspective views of a brush according to the invention made from the brush shown in Figure 3. Figure 5 is a sectional view of a device for eye makeup. The brush 100 shown in FIGS. A and IB includes a straight bar 101 defining a main axis X-Xj At the end 101.1 of this bar 101 is fixed, by means of pressure under pressure, a core 102 (which has been shown in this FIG. figure although it is inside the brush) elongated formed by spiral winding of two arms of a metal wire 103 that has been bent in a U-shape before the arms are twisted. The axis of the core 102 is confused with the main axis X-X. Hairs 104 are so implanted radially between the arms of the wire 103. When the strands of the yarn 103 are rewound, the hairs are tightened and held between the helical turns of the core 102. The ends of the hairs 104 define the surface of the brush 105: is a surface of revolution that has the shape of a diabolo and whose ends are constituted by two straight sections the disc 106.a, of center 108.a and the disc 106.b of center 108.b. Each section 106 of the brush 100 has the shape of a disc, all the sections 106 being parallel to each other. The intersection of the surface 105 with any meridian plane of the brush defines meridians 107, all identical, with the same radius of curvature. The core 102 is printed with the help of an appropriate tool, for example by pressing it longitudinally around a metal cylinder with radius of curvature r, a first torsion in a meridian plane, between sections 106.a and 106.b. so that it takes the form of one of the meridians 107, then a second torsion, in the same plane., between the end 101.1 of the bar and the center 108a of the end section of the brush, in order to align the center 108.b of the other end of the brush on the main axis X-X as the first end 108.a. By means of this operation, a brush 200 according to the invention shown in FIGS. 2A and 2B is obtained. In these figures, the references assigned to elements analogous to those of Figures IA and IB are those of Figures IA and IB increased by 100. The brush of Figures 2A and 2B is distinguished from that of Figures IA and IB by the fact that the soul 202 is curved, with a radius of curvature substantially equal to r. However, its ends 208.a and 208b are aligned on the main axis X-X. The intersection of the surface 205 of the brush with the planes passing through the main axis X-X defines a ridge lines 207. Figure 2B proceeds from Figure 2A by rotation of a quarter turn around the main axis X-X. It is seen in Figure 2A that the sections 206 converge while the sections 106 of the brush of Figure 1 are parallel. The brush of figure 2A comprises two surfaces one - first surface 207.1, straight, substantially parallel to the main axis xX, and a second surface 207.2, curved, diametrically opposite with respect to the core 202. The passage) from one ridge line to another it is carried out continuously, t with a continuous variation of the curvature from the maximum curvature of 207.2 to a sensibly straight peak line as 207.1. In Figure 3, references assigned to elements analogous to those of Figures IA and IB are those of Figure IA and IB increased by 200. The brush depicted in Figure 3 is distinguished from that of Figure 1 by its surface 305 which It has the shape of a peanut. Each of the sections 306 of the brush has the shape of a disc. The meridians 307 are of variable concave main curvature, furthermore, their ends 309 have a slight convexity. The core 302 is printed, with the aid of an appropriate tool, for example by longitudinally pressing it air of "a metallic cylinder of radius of curvature r ', a first torsion, in the plane of a meridian 307.1, between sections 306.a 306.b, so that it assumes the same curvature r1 as this meridian 307.1, the torsion being made in the opposite direction in relation to this meridian; then in the same plane, a second twist between the end 301.1 of the bar and the center 308.a of the end section of the brush, in order to align the center 308b of the end end of the brush on the main axis XX as the first end 308.a. I By the operation described above, a brush 400 according to the invention shown in FIGS. 4A and 4B is obtained. In these figures, the references assigned to elements similar to those of figure 3 are those of figure 3 increased by 100. The brush of figures 4A and 4B is distinguished from that of figure 2 by the fact that the ends of the surface 405, around the straight sections 406.a and 406.b are rounded. The core 402 is curved, its curvature is remarkably equal to that of the meridians 307.1 of the starting brush described in figure 3. The intersection of the surface 405 of the brush with the planes passing through the main axis XX defines some lines of crest. Figure 4B proceeds from Figure 4A by rotation of a quarter turn of the main axis X-X. It is seen in Figure 4A that I S sections 406, circular, converge, while the sections 306 of the brush of Figure 3 are parallel. The brush of figure 4A comprises two surfaces 407. 1, straight, substantially parallel to the main axis X-X, without flexing at its ends 409.1 towards the core 402; 407.2. curve, concave, with an inflexion of the curve towards the core 402 at its ends 409.2. The two surfaces are diametrically opposed to the core 402. The passage from one ridge line to another is continuously carried out, with a continuous variation of the main curve of the main axis X-X is continuous.

The device for eye makeup depicted in Figure 5 comprises a cylindrical reservoir 520, comprising a neck 524, threaded, superimposed by a sealing gasket 525 and filled with mascara 515. Tank 520 includes a drainer in its neck 521, the maintenance in position of the drainer in the neck is secured by a flange 526 that cooperates with the projection separating the neck of the deposit 520 proper. The drainer 521 is constituted in a known way, of a flexible and elastic meter. An applicator is intended to cooperate with the reservoir 520. This applicator is constituted by a gripping means 523 supporting the application member 530, comprising a bar 522 and an application member 501, identical to those shown in FIGS. 2A and 2B. The gripping means 523 is in the form of a cap and includes a threading 523a cooperating with the threading 524a of the neck of the deposit. The sealing of the reservoir 520 is obtained by screwing the gripping means 523 on the neck 524 of the reservoir provided with its gasket 525. When the applicator member 530 is removed from the reservoir, the applicator member having the shape of a loaded brush of mascara passes through the drainer 521. It drains the hairs from the surfaces of strong curvature much more important than the hairs of the flat surfaces. In the application on the eyelashes, the brush smoothes, curves and separates by its flat profile, then the same one loads it of product by the rest of its surface. With regard to the brushes of varied curvatures, such as the recurved cylindrical brushes (bull fractions), known from the prior art, the brush according to the invention offers the advantage of combing the eyelashes well, which translates into a better extension of the product , a more pronounced lengthening and recurving effect.

Claims (23)

1. Brush comprising a straight bar defining a main axis (xx), a flexible core comprising first and second ends, the first end being attached to this bar, hairs implanted radially in this core, defining the end of the hairs the surface of the brush, including this surface, a first surface, passing the intersection of any meridian plane; by the main axis with the brush surface defi. ne two lines of crest that has a certain curvature, brush that is characterized because the soul is curved, because the crest lines are concave and because the first surface is substantially straight and parallel to the main axis (x-x).

2. Brush according to claim 1, wherein the intersection of the brush surface with any pía not perpendicular to the core, at each point of the core, defining a section characterized in that the core is central with respect to each section.

3. Brush according to any one of the preceding claims whose surface includes a second surface includes a second surface. characterized in that the curvature of the crest lines passes through a maximum at the height of this second surface, called the maximum curvature surface.

4. Brush according to the preceding claim, characterized in that the curvature of the ridge lines increases continuously from the straight surface to the maximum curvature surface. \

5. Brush according to any one of the preceding claims, characterized in that the surface of the brush includes a single straight surface.

6. Brush according to any one of the preceding claims, characterized in that the curvature of the ridge lines passes through a single maximum.

7. Brush according to any one of claims 3 to 6, characterized in that the surfaces of maximum and straight curvature are diametrically opposite with respect to the core. •

8 Brush according to any one of claims 2 to 7, characterized in that the hairs of the same section are all of identical length.

9. Brush according to any one of the preceding claims, characterized in that the ends of the core are aligned on the main axis x-x.

10. Brush according to any one of the preceding claims, characterized in that the core is formed by the spiral winding of the two arms of a metal wire that has been bent in a U-shape before the arms are twisted.

11. Brush according to the preceding claim, characterized in that the spiral winding of the two branches of the metal wire forming the core includes a step to the left.

12. Brush according to any one of the preceding claims, characterized in that it comprises an alternation of rows of short hairs and long hairs, - the long hairs being the only ones taken into account to define the surface of the brush. _

13. Method of manufacturing a brush according to any one of the preceding claims, characterized in that: a) a starting brush is taken comprising a straight bar defining a main axis (xx), a flexible core, comprising a first and a second ends, the first end being integral with this bar being the soul straight and in alignment with the bar, with hairs being implanted radially in this core, the end of the hairs defining the surface of the bar. starting brush, the indicated surface. of concave shape, passing the intersection of all meridian planes by the main axis, with the surface of the starting brush that defines two concave ridges, with a determined curvature, b) in a first stage the soul is printed a torsion in a meridian plane, the indicated torsion being a curvature roughly equal to the curvature of one of the two meridians of this plane and having the opposite direction of the curvature of this meridian.

14. Process according to the preceding claim wherein the intersection of the surface of the starting brush with any plane perpendicular to the core, at "each point of the core, a section of the starting brush is defined, characterized in that because the core is: central with respect to each section.

15. Method according to any one of claims 13 or 14, characterized in that in a second stage: c) a torsion is printed at the end of the core sue is integral with the bar in order to align the second end of the core on the main axis (xx ).

16. Process according to any one of claims 13 to 15, characterized in that the surface of the starting brush has a meridian plane of symmetry.

17. Process according to any one of claims 13 to 16, characterized in that the starting brush surface. It is of closed curve.

18. Process according to any one of claims 13 to 17, characterized in that the starting brush comprises a plane of symmetry perpendicular to the axis of the -alma.

19. Process according to any one of claims 13 to 18, characterized in that each section of the starting brush is convex.

20. Process according to any one of claims 13 to 19, characterized in that each section of the starting brush has the shape of a disc.

21. Process according to any one of claims 12 to 20, characterized in that the surface of the starting brush has the shape of a diabolo.

22. Process according to any one of claims 12 to 20, characterized in that the surface of the starting brush has the shape of a peanut.

23. Make-up device comprising a mascara container and a mascara applicator, characterized in that the application member is according to any one of claims 1 to 12.