Progressive brush for applying a cosmetic product

Abstract

A brush for applying a cosmetic product, in particular for applying mascara to eyelashes or dye to hair, has an elongate core ( 2 ) formed by the helical winding of two strands of metal wire ( 3 ), with bristles ( 4 ) radially implanted in the core and being tightly held between the twisted strands. The brush is of an overall cylindrical shape and comprises at least one concave cutback ( 7 ) which holds the product during the wiping and which is obtained by clipping the brush. Such a brush allows a make-up to be obtained which is copious, regular and elongating.

1. A brush for application of a cosmetic product to keratinous fibers, comprising:
 an elongate core; and  
 bristles extending substantially radially from said core,  
 wherein said bristles define a part of a cylindrical envelope with a central axis, and wherein bristles within the axial limits of the cylindrical envelope form at least one concave cutback and at least one crest zone on the cylindrical envelope, the width of the at least one concave cutback varying along the length of the brush, the at least one concave cutback having a single maximum width.  
 
     
     
       2. A brush according to  claim 1  wherein said core comprises two helically wound strands of metal wire, and wherein said bristles are tightly held between the wound strands of the core. 
     
     
       3. A brush according to  claim 1  wherein the at least one concave cutback comprises a clipped part of the bristles. 
     
     
       4. A brush according to  claim 1  wherein the at least one concave cutback has a contour having at least one edge of a substantially round shape. 
     
     
       5. A brush according to  claim 4  wherein said at least one edge has a portion substantially parallel to the central axis. 
     
     
       6. A brush according to  claim 4  wherein the contour has at least two rounded edges substantially parallel to the central axis. 
     
     
       7. A brush according to  claim 1  wherein the at least one concave cutback has a maximum depth which is not greater than the maximum width thereof and is situated substantially in the middle of the at least one concave cutback. 
     
     
       8. A brush according to  claim 1  wherein the length of said at least one concave cutback is substantially parallel to the axis of the brush. 
     
     
       9. A brush to  claim 1  wherein the core defines an axis coinciding with the central axis of the brush. 
     
     
       10. A brush according to  claim 1  wherein the maximum width of the at least one concave cutback is substantially perpendicular to the axis of the brush. 
     
     
       11. A brush according to  claim 1  wherein the maximum width is not greater than the length of the at least one concave cutback. 
     
     
       12. A brush according to  claim 1  wherein the at least one concave cutback is symmetrical relative to a plane passing through the maximum width thereof and perpendicular to the central axis. 
     
     
       13. A brush according to  claim 1 , comprising at least two of said cutbacks. 
     
     
       14. A brush according to  claim 1  wherein a contour of the at least one concave cutback is one of oval, circular, elliptical and one comprised of two portions of intersecting circles whose concavities face one another. 
     
     
       15. A brush according to  claim 1  wherein a contour of the least one concave cutback defines a sharp edge. 
     
     
       16. A brush according to  claim 1  wherein the at least one concave cutbacks are situated in zone with a low density of bristles, and wherein end zones of the brush and the at least one crest zone has a higher density of bristles. 
     
     
       17. A brush according to  claim 1  wherein the at least one crest zone has an alternation of rows with shorter bristles and rows of longer bristles. 
     
     
       18. A brush according to  claim 1 , further comprising a gripping stem. 
     
     
       19. A brush according to  claim 1 , wherein the length of said at least one concave cutback is less than the axial length of the cylindrical envelope. 
     
     
       20. A device comprising:
 a reservoir for mascara; and  
 a mascara applicator having a brush for application of a cosmetic product to keratinous fibers, the brush comprising an elongate core and bristles extending substantially radially from said core wherein said bristles define a part of a cylindrical envelope with a central axis, and wherein bristles within the axial limits of the cylindrical envelope form at least one concave cutback and have at least one crest zone on the cylindrical envelope, the width of the at least one concave cutback varying along the length of the brush, the at least one concave cutback having a single maximum width.  
 
     
     
       21. A device according to  claim 20 , further comprising a cap for closing the reservoir in a leakproof manner, wherein the cap holds the applicator. 
     
     
       22. A brush according to  claim 20 , wherein the length of said at least one concave cutback is less than the length of the cylindrical envelope. 
     
     
       23. A brush according to  claim 1  wherein the at least one concave cutback is situated in a zone with a low density of bristles, and wherein end zones of the brush and the at least one crest zone have a higher density of bristles.  
     
     
       24. A brush for application of a cosmetic product, comprising:
   an elongate core; and        bristles extending substantially radially from the core,        wherein at least some of the bristles define a part of a cylindrical envelope with a central axis, and wherein bristles within the axial limits of the cylindrical envelope form at least one concave cutback and at least one crest zone on the cylindrical envelope, the width of the at least one concave cutback varying along the length of the cylindrical envelope.      
     
     
       25. A brush according to  claim 24 , wherein some of the bristles are outside the axial limits of the cylindrical envelope.  
     
     
       26. A brush according to  claim 24 , wherein some of the bristles define an end zone outside the axial limits of the cylindrical envelope.  
     
     
       27. A brush according to  claim 26 , wherein the end zone has a frustoconical shape.  
     
     
       28. A brush according to  claim 24 , wherein the core comprises two helically wound strands of wire.  
     
     
       29. A brush according to  claim 28 , wherein the bristles are tightly held between the wound strands of the core.  
     
     
       30. A brush according to  claim 24 , further comprising a stem having an end, wherein the core is on the end of the stem.  
     
     
       31. A brush according to  claim 30 , wherein the core is force- fitted to the end of the stem.    
     
     
       32. A brush according to  claim 24 , wherein the core defines an axis coinciding with the central axis of the brush.  
     
     
       33. A brush according to  claim 24 , wherein the at least one concave cutback has a contour having at least one edge having a substantially round shape.  
     
     
       34. A brush according to  claim 33 , wherein the at least one edge has a portion substantially parallel to the central axis.  
     
     
       35. A brush according to  claim 33 , wherein the contour has at least two rounded edges substantially parallel to the central axis.  
     
     
       36. A brush according to  claim 24 , wherein the length of the at least one concave cutback is substantially parallel to the central axis.  
     
     
       37. A brush according to  claim 24 , comprising at least two of the concave cutbacks.  
     
     
       38. A brush according to  claim 24 , wherein a contour of the at least one cutback is selected from oval, circular, elliptical, and one comprised of two portions of intersecting circles whose concavities face one another.  
     
     
       39. A brush according to  claim 24 , wherein a contour of the at least one cutback defines a sharp edge.  
     
     
       40. A brush according to  claim 24 , wherein the at least one cutback is situated in a zone with a low density of bristles, and the at least one crest zone has a higher density of bristles.  
     
     
       41. A brush according to  claim 24 , wherein the at least one crest zone has an alternation of rows with shorter bristles and rows of longer bristles.  
     
     
       42. A brush according to  claim 24 , wherein the at least one concave cutback has a single maximum width.  
     
     
       43. A brush according to  claim 42 , wherein the at least one concave cutback has a maximum depth which is not greater than the maximum width of the at least one concave cutback.  
     
     
       44. A brush according to  claim 43 , wherein the maximum depth of the at least one cutback is situated substantially in the middle of the at least one concave cutback.  
     
     
       45. A brush according to  claim 42 , wherein the maximum width of the at least one concave cutback is substantially perpendicular to the axis of the brush.  
     
     
       46. A brush according to  claim 42 , wherein the maximum width is not greater than the length of the at least one concave cutback.  
     
     
       47. A brush according to  claim 42 , wherein the at least one concave cutback is symmetrical relative to a plane passing through the maximum width of the at least one concave cutback.  
     
     
       48. A brush according to  claim 24 , wherein the at least one concave cutback comprises a clipped part of the bristles.  
     
     
       49. A brush according to  claim 24 , wherein the bristles include longer bristles and shorter bristles.  
     
     
       50. A brush according to  claim 49 , wherein the longer bristles define the at least one crest zone and the shorter bristles define the at least one cutback.  
     
     
       51. A brush according to  claim 49 , wherein the longer bristles define the part of the cylindrical envelope.  
     
     
       52. A brush according to  claim 24 , wherein bristles within the axial limits of the cylindrical envelope define a portion of the at least one concave cutback.  
     
     
       53. A brush according to  claim 52 , wherein a contour of the at least one concave cutback intersects one of the axial limits of the cylindrical envelope.  
     
     
       54. A brush according to  claim 24 , wherein a contour of the at least one concave cutback is tangential to one of the axial limits of the cylindrical envelope.  
     
     
       55. A method of applying a cosmetic product to a surface region of a body, comprising:
   providing the brush of    claim 24   ;        placing a cosmetic product on the bristles; and        transferring the cosmetic product from the bristles to a surface region of a body.      
     
     
       56. The method of  claim 55 , wherein the cosmetic product is mascara and the surface region includes eyelashes.  
     
     
       57. The method of  claim 55 , wherein the cosmetic product is hair dye and the surface region includes hair.  
     
     
       58. The method of  claim 55 , wherein a portion of the brush further comprises a stem to be grasped by a user during application of the product, and wherein the method further comprises grasping the stem.  
     
     
       59. A device comprising:
   a reservoir for cosmetic product; and        a cosmetic product applicator including a brush for application of a cosmetic product, the brush comprising an elongate core and bristles extending substantially radially from the core,        wherein at least some of the bristles define a part of a cylindrical envelope with a central axis, and wherein bristles within the axial limits of the cylindrical envelope form at least one concave cutback and at least one crest zone on the cylindrical envelope, the width of the at least one concave cutback varying along the length of the cylindrical envelope.      
     
     
       60. The device according to  claim 59 , further comprising a cosmetic product contained in the reservoir.  
     
     
       61. A device according to  claim 60 , wherein the cosmetic product is selected from one of mascara and hair dye.  
     
     
       62. A device according to  claim 59 , further comprising a cap for closing the reservoir, the cap being attached to the brush.  
     
     
       63. A device according to  claim 59 , wherein the length of the at least one concave cutback is less than the length of the cylindrical envelope.  
     
     
       64. A device according to  claim 59 , wherein the brush comprises at least two of the concave cutbacks.  
     
     
       65. The device according to  claim 59 , wherein the reservoir includes an opening and a wiper configured to remove excess product from the bristles when the cosmetic applicator is withdrawn from the reservoir.  
     
     
       66. The device according to  claim 65 , wherein the wiper is made of an elastomeric material.  
     
     
       67. A device according to  claim 59 , wherein the bristles within the axial limits of the cylindrical envelope define a portion of the least one concave cutback.  
     
     
       68. A device according to  claim 67 , wherein a contour of the at least one concave cutback intersects one of the axial limits of the cylindrical envelope.  
     
     
       69. A device according to  claim 59 , wherein a contour of the at least one concave cutback is tangential to one of the axial limits of the cylindrical envelope.