Sealing cap

Abstract

The invention relates to a scaling cap ( 1 ) that is to be screwed and/or pressed onto the pouring neck ( 4 ) of a container, especially a bottle. Said sealing cap ( 1 ) comprises a particularly annular coaxial sealing lip ( 6 ) which is fixed within the bottom ( 2 ) of the cap and extends into the neck when the cap is mounted. The sealing lip is curved and/or buckled towards the outside between the upper and the lower end ( 7, 8 ) thereof in such a way that the curvature ( 12 ) and/or the buckled point ( 9 ) travel/s further out and the external face of the sealing lip sealingly rests against the interior wall of the neck when the sealing lip is compressed in an axial direction.

1 . A cap closure ( 1 ) to be screwed and/or pressed onto the pour neck ( 4 ) of a container, in particular a bottle, comprising an in particular annular coaxial seal lip ( 6 ) that is attached to the end wall of the cap and extends into the neck when the cap is mounted, characterized in that the seal lip ( 6 ) is outwardly curved and/or creased between the upper end ( 7 ) and the lower end ( 8 ) thereof in such a way that the curvature ( 12 ) and/or the crease ( 9 ) extends farther out and the outer face of the seal lip ( 6 ) rests in a sealing manner against the inner wall of the neck ( 4 ) when the seal lip is compressed axially.  
   
   
       2 . The cap closure according to  claim 1 , a characterized in that the annular crease ( 9 ) or annular outer region of the curvature ( 12 ) forms the seal with the inner wall of the neck ( 4 ).  
   
   
       3 . The cap closure and pour neck according to  claim 1 , characterized in that the pour neck ( 4 ) on its inner wall has at least one support surface ( 11 ) against which the lower end ( 8 ) of the seal lip ( 6 ) abuts.  
   
   
       4 . The cap closure and a pour neck according to  claim 3 , characterized in that the support surface ( 11 ) is annular.  
   
   
       5 . The cap closure according to  claim 3 , characterized in that the support surface ( 11 ) is formed by at least two projections on the inner wall of the pour neck ( 4 ).  
   
   
       6 . The cap closure according to  claim 1 , characterized in that the seal lip ( 6 ) has at least two creases.  
   
   
       7 . The cap closure according to  claim 1 , characterized in that the upper attachment point ( 7 ) has a material weakness, in particular a reduction in thickness, of the seal lip between the seal lip ( 6 ) and the cap end wall ( 2 ).  
   
   
       8 . The cap closure according to  claim 1 , characterized in that the inner surface of the neck ( 4 ) and/or the outer face of the seal lip ( 6 ) have/has a raised location, in particular an annular bead, as a support.  
   
   
       9 . The cap closure according to  claim 1 , characterized in that the axial dimension ( 2 ) of the seal lip ( 6 ) is 30-100% of the height (H) of the cap ( 4 ).  
   
   
       10 . The cap closure according to  claim 3 , characterized in that a distance (A) from the support surface ( 11 ) to the upper end of the neck ( 4 ) is less than the axial length (L) of the seal lip ( 6 ).  
   
   
       11 . In combination with a container pour neck centered on an axis, 
 a cap fittable axially over the neck and having an end wall and a side wall;    an annular seal lip extending axially inward from an attachment point at the end wall, fittable inside the pour neck, having an inner end, and of a diameter that is greater at a central region between the attachment point and the inner end than at the inner end; and    a formation engageable with the inner end of the seal lip when the cap is fitted over the pour neck to axially compress the seal lip and force the central region radially outward into sealing engagement with an inner surface of the pour neck.    
   
   
       12 . The combination defined in  claim 11 , further a comprising 
 screw formations between an outer surface of the pour neck and an inner surface of the side wall.    
   
   
       13 . The combination defined in  claim 11  wherein the central region is in unstressed condition of a diameter slightly smaller than an inside diameter of the pour neck.  
   
   
       14 . The combination defined in  claim 11  wherein the lip is creased and is formed by an outer frustoconical portion and an inner frustoconical portion.  
   
   
       15 . The combination defined in  claim 14  wherein the creased lip is pressed substantially in line contact at its crease against the pour-neck inner surface when compressed axially.  
   
   
       16 . The combination defined in  claim 11  wherein the lip is of radially inwardly concave C-section.  
   
   
       17 . The combination defined in  claim 11  wherein the formation is an annular shoulder formed in the pour cap and axially engageable with the end of the lip.  
   
   
       18 . The combination defined in  claim 17  wherein an axial distance between the shoulder and an outer edge of the pour neck is slightly shorter than an axial length of the lip between the end wall and its outer end.