the brush 100 depicted in fig1 and 1a comprises a straight wand 101 defining a main axis x -- x . fixed by force - fitting to the end 101 . 1 of this wand 101 is a core 102 ( which has been depicted in these figures even though it is inside the brush ) which is elongate , formed by the helical twisting of two branches of a metal wire 103 which has been bent into a u before the branches were twisted . the axis of the core 102 coincides with the main axis x -- x . bristles 104 are inserted radially between the branches of the wire 103 . when the branches of the wire 103 are twisted , the bristles are clamped and held between the helical turns of the core 102 . the ends of the bristles 104 define the surface 105 of the brush . this is a convex axisymmetric surface which has the shape of a rugby ball and the ends of which consist of two right cross - sections : the disk 106 . a with a center 108 . a and the disk 106 . b with a center 108 . b . using a trimmer , two more or less flat parallel faces are cut in the brush of fig1 a over practically the entire length ( measured along the axis x -- x ) of the brush . depicted in fig1 a is the intersection ( γ ) between the surface 105 of the brush and the trimming plane . this yields a trimmed brush depicted in fig1 b and 1c . for elements of fig1 b and 1c which are common to those of fig1 a , the reference numbers in fig1 b and 1c are the same as those in fig1 a , increased by 10 . the brush depicted in fig1 b and 1c has two mutually parallel faces 119 which are also parallel to the axis x -- x . these two faces are equidistant from the core 112 . the distance between the two faces is represented by the symbol d . the two faces are joined by rounded edges 120 . in the region where the faces 119 have cutouts , the sections of the brush on a plane perpendicular to x -- x consist of curves 115c depicted in fig1 c which are more or less rectangular , with a long length d in the direction of the axis of greatest length z -- z and the greatest width d measured along the axis of greatest width y -- y with d & gt ; 1 . 5d . the two faces do not extend as far as the ends 117a and 117b of the brush . at these ends , the sections 116a , 116b of the brush are circular wherein a width dimension of a cross - section in the direction of an axis perpendicular to the axis x -- x at these ends is substantially zero . the curve 115c is symmetric with respect to the axis of greatest length z -- z and the axis of greatest width y -- y . using an appropriate tool , for example by pressing the core longitudinally around a metal cylinder , the core 112 is given a first twist in the plane perpendicular to the faces 119 between the sections 116 . a and 116 . b , in such a way that the core has more or less the shape of an arc of a circle , and then it is given a second twist , in the same plane , between the end 111 . 1 of the wand and the center 118 . a of the end section of the brush , so as to align the center 118 . b of the other end of the brush with the main axis x -- x , like the first end 118 . a . this operation yields a brush 120 according to the invention and depicted in fig1 d and 1e . in these figures , the reference numbers given to elements which are similar to those in fig1 b and 1c are those of fig1 b and 1c increased by 10 . the brush in fig1 d and 1e is more or less in the shape of an elongate spoon . the core 122 describes a curve c 1 which is more or less an arc of a circle . however , its ends 128 . a and 128 . b are aligned with the main axis x -- x . the brush comprises two faces 129a , 129b , one of them , 129a , forming the back and the other face , 129b , forming the hollow bowl of the spoon . these two faces are joined by rounded edges 120 . the surface 125 of the brush is generated by a series of curves 115c , as depicted in fig1 c , which progress along the core 122 . these curves are more or less rectangular , with their axes of greatest length ( z -- z ) being mutually parallel . at its ends 127a , 127b , the brush is generated by circular curves . fig2 a is differentiated from fig1 a by the fact that the surface 205 of the starting brush is in the shape of a cone frustum . using a trimmer , two secant rounded faces are cut in the brush of fig2 a along the entire length ( measured along the axis x -- x ) of the brush . this yields a trimmed brush depicted in fig2 b and 2c . for elements of fig2 b and 2c which are common to fig2 a , the reference numbers in fig2 b and 2c are the same as those in fig2 a increased by 10 . the brush depicted in fig2 b and 2c has two rounded and secant faces 219 . these two faces are symmetric with respect to the core 212 . the width between the extremes of the two faces is represented by symbol d . width d is more or less constant from one end of the brush to the other . the two faces are joined by edges 220 which end in ridges 220a . the sections of the brush on a plane perpendicular to x -- x consist of curves 215c depicted in fig2 c which are more or less eye - shaped , with the long length d along the axis of greatest length z -- z and greatest width d measured along the axis of greatest width y -- y . d increases from a first end 216b as far as a second end 216a with d & gt ; 2d on the curve 215c depicted in fig2 c . the two trimmed faces extend as far as the end sections 216a and 216b of the brush . the curve 215c is symmetric with respect to the axis of greatest length z -- z and the axis of greatest width y -- y . using an appropriate tool , for example by pressing the core longitudinally around a metal cylinder , the core 212 is given a first twist in the plane perpendicular to the faces 219 between the sections 216 . a and 216 . b , in such a way that the core has more or less the shape of an arc of a circle , and is then given a second twist , in the same plane , between the end 211 . 1 of the wand and the center 218 . a of the end section of the brush , so as to align the center 218 . b of the other end of the brush with the main axis x -- x , like the first end 218 . a . this operation yields a brush 200 according to the invention and depicted in fig2 d . in this figure , the reference numbers given to elements that are similar to those in fig2 b and 2c are those of fig2 b and 2c increased by 10 . the brush in fig2 d is more or less in the shape of an elongate spoon ; the core 222 describes a curve c 2 which is more or less an arc of a circle . however , its ends 228 . a and 228 . b are aligned with the main axis x -- x . the surface 225 of the brush comprises two faces 229a , 229b , one of them , 229a , forming the back and the other , 229b , forming the hollow bowl of the spoon . these two faces are joined by a ridge 230a . the surface 225 of the brush is generated by a series of curves 215 as depicted in fig2 c , which progress along the core 222 . these curves are more or less eye - shaped , with their axes of greatest length ( z -- z ) mutually parallel . in the two embodiments of the invention described hereinabove , use was made of starting brushes with the shape of a rugby ball and a frustoconical shape , but it is also possible to use an elongate starting brush with a shape chosen from : a cylinder , two cones joined together by the bases of the two identically - sized cones , a fish as described for example in the french patent application fr - a - 2730910 , a peanut , an obus ( shell shaped ) or a teardrop . the device for applying make - up to the eyes depicted in fig3 comprises a cylindrical reservoir 320 which has a threaded neck 324 surmounted by a seal 325 and which is full of a mascara 315 . in its neck , the reservoir 320 has a wringing device 321 , the wringing device being held in position in the neck by a rim 326 that interacts with the shoulder separating the neck from the reservoir 320 proper . the wringing device 321 consists , in a known manner , of a flexible and elastic material . an applicator is intended to interact with the reservoir 320 . this applicator consists of means 323 for holding which supports the applicator member 330 , comprising a wand 322 and an applicator member 301 which are identical to those depicted in fig1 d or 2d . the means 323 for holding is in the form of a cap and has a screw thread 323a which interacts with the screw thread 324a on the neck of the reservoir . the reservoir 320 can be closed and sealed by screwing the means 323 holding onto the neck 324 of the reservoir provided with its seal 325 . when the applicator member 330 is pulled out of the reservoir , the applicator member which is in the form of a brush laden with mascara passes through the wringing device 321 . the latter wrings out the bristles on the back of the brush more than it wrings out the bristles in the hollow of the brush . the bristles on the sides of the brush are very much wrung out . while applying the mascara to the eyelashes , the brush coats the lashes with product on both faces , then spreads out the product , lengthens and curls the lash with its back and hollow faces , and combs using its sides . as the bristles on the sides are very long compared with the rest of the bristles of the brush and the comb is not very thick , the lashes are engaged very well during this combing - out , which is very effective . compared with the brushes known from the prior art that are convex overall , the brush according to the invention offers the advantages of being very easy to use , of applying make - up to all of the hairs on the eyelid without overspill , and of providing a very lengthening and very curling make - up effect with good separation .
a brush which includes a straight wand defining a major axis ; a flexible core which defines the length of the brush , the core including a first end and a second end , the first end being secured to the wand . a plurality of bristles are inserted radially into this core , the end of the bristles defining an envelope surface of the brush , the envelope surface having a first end and a second end , wherein the core is curved in a plane of curvature and the envelope surface of the brush over at least part of its length has a cross - section of elongate shape in the direction of an axis of greatest length perpendicular to the plane of curvature .