Cap for a container neck

Abstract

A cap for a container neck includes a tubular skirt defining a longitudinal central axis, and a plurality of longitudinal ribs distributed around a periphery of the skirt, each having a free supporting end for the pad of at least one finger of a user. The plurality of ribs on the skirt includes main ribs and secondary ribs, the supporting ends of the main ribs having a radius of curvature greater than a radius of curvature of the supporting ends of the secondary ribs. At least one of the secondary ribs is arranged between the main ribs. A tamperproofing strip, centered on the axis, is connected to the skirt by a weakening line designed to break when the cap is first opened. The tamperproofing strip includes longitudinal ribs distributed around the outer periphery of the strip, each with a free supporting end for the pad of at least one finger.

1 . A cap for a container neck, comprising:
 a tubular skirt defining a longitudinal central axis, which is capable of coaxially surrounding the neck and which is outwardly provided with a plurality of longitudinal ribs, distributed along the periphery of the skirt and each provided with a free supporting end for the pad of at least one finger of the user,
 wherein the plurality of ribs of the skirt includes main ribs and secondary ribs, the supporting ends of the main ribs having, in cross-section transverse to the axis, a curve radius larger than the curve radius of the supporting end of the secondary ribs, 
 wherein, along the periphery of the skirt, at least one of the secondary ribs is arranged between the main ribs so that, when the pad of the finger is pressed against the supporting end of one of the secondary ribs to screw or unscrew the cap, that pad also bears against the supporting ends of two main ribs situated on either side of said secondary rib, and 
 wherein the cap also comprises a tamperproof strip centered on the axis, connected to the skirt by a weakening line adapted to break the first time the cap is opened, 
   
       wherein the tamperproofing strip is outwardly provided with longitudinal ribs that are distributed along the outer periphery of the strip and each provided with a free supporting end for the pad of at least one finger of the user. 
     
     
         2 . The cap according to  claim 1 , wherein the secondary ribs of the skirt are flexible in relation to the rest of the skirt, in particular deformable by bending in a direction orthoradial to the axis during bearing of the pad of the finger of the user. 
     
     
         3 . The cap according to  claim 1 , wherein each main or secondary rib of the skirt has a radial thickness that is substantially constant over the entire running portion of the rib and that is decreasing at least at one of its longitudinal ends. 
     
     
         4 . The cap according to  claim 3 , wherein, at its longitudinal end turned toward a transverse wall for closing the skirt, each main or secondary rib of the skirt has a radial thickness continuously decreasing between two circumferences of the cap, at the axial level of which that thickness is respectively maximal and zero. 
     
     
         5 . The cap according to  claim 3 , wherein, at its longitudinal end opposite a transverse wall for closing the skirt, each main or secondary rib of the skirt has a radial thickness that increases in the direction opposite said transverse wall, while in particular having a concave profile. 
     
     
         6 . The cap according to  claim 1 , wherein the plurality of ribs of the strip includes main ribs and secondary ribs, the supporting ends of said main ribs having, in cross-section transverse to the axis, a larger curve radius than that of the supporting ends of said secondary ribs, and wherein, along the periphery of the strip, at least one of the secondary ribs is arranged between the main ribs such that, when the pad of the finger of the user is pressed against the supporting end of one of the secondary ribs to unscrew the cap for the first time, that pad also bears against the supporting ends of two main ribs situated on either side of the secondary rib. 
     
     
         7 . The cap according to  claim 6 , wherein before breaking of the weakening line, the angular positioning around the axis of the main ribs of the strip is identical to that of the main ribs of the skirt, and the angular positioning of the secondary ribs of the strip is identical to that of the secondary ribs of the skirt. 
     
     
         8 . The cap according to  claim 1 , wherein the radial thickness of each rib of the strip increases from its longitudinal end turned toward the skirt at its longitudinal end opposite the skirt, to reach a maximum radial thickness at the axial level of a circumference of the cap, forming a peripheral border. 
     
     
         9 . The cap according to  claim 1 , wherein the main and secondary ribs of the skirt and the ribs of the strip jointly define a substantially tapered enclosure, centered on the axis and converging toward a transverse wall for closing the skirt, situated axially opposite the strip. 
     
     
         10 . The cap according to  claim 6 , wherein the radial thickness of each main or secondary rib of the strip increases from its longitudinal end turned toward the skirt at its longitudinal end opposite the skirt, to reach a maximum radial thickness at the axial level of a circumference of the cap, forming a peripheral border. 
     
     
         11 . The cap according to  claim 6 , wherein the main and secondary ribs of the skirt and the main and secondary ribs of the strip jointly define a substantially tapered enclosure, centered on the axis and converging toward a transverse wall for closing the skirt, situated axially opposite the strip.