Push-off cap of plastic

Abstract

A guarantee strip via break-off webs is integrally formed on a push-off cap with a cover surface and with a peripheral skirt on which a push-piece is arranged. This guarantee strip is designed without tabs as a closed ring. In order to be able to open the push-off cap with one hand, according to the invention it is suggested to vary the break-off webs in diameter. At the same time in particular the break-off webs in the region of the push-piece are designed thinner than the break-off webs which are arranged subsequent to these. The extremely thin break-off webs, to prevent injury when placing on [the cap], are protected by way of support cams which are arranged in the intermediate space between the lower edge of the peripheral skirt and the upper edge of the annular guarantee strip, so that only a very narrow gap arises.

1 . A push-off cap of plastic for fastening on a container with a container neck with a retaining bead, wherein the cap comprises a peripheral skirt on which a push-piece is integrally formed and on which a peripheral guarantee strip engages via break-off webs, 
 characterised in that the guarantee strip is designed completely and without tabs as an unweakened closed ring and is integrally formed via break-off webs, wherein the break-off webs have different diameters and on account of this permit a one-handed opening of the cap for the first time.    
   
   
       2 . A push-off cap according to  claim 1 , characterised in that the break-off webs in the vicinity of the push-piece have a smaller diameter than the break-off webs which follow directly in the peripheral direction.  
   
   
       3 . A push-off cap according to  claim 1 , characterised in that the break-off webs in the region lying diametrically opposite the push-piece have a smaller diameter than the adjacent break-off webs.  
   
   
       4 . A push-off cap according to  claim 3 , characterised in that the break-off webs in the region lying opposite the push-piece have a larger diameter than the break-off webs in the region of the push-piece but a smaller diameter than the adjacent break-off webs.  
   
   
       5 . A push-off cap according to  claim 2 , characterised in that at least one connection location between the guarantee strip and the cap is present diametrically opposite the push-piece, and this location forms a joint for reclosure of the cap.  
   
   
       6 . A push-off cap according to  claim 1 , characterised in that the break-off webs reduce in cross section from the cap skirt towards the guarantee strip.  
   
   
       7 . A push-off cap according to  claim 1 , characterised in that the break-off webs reduce in cross section from the guarantee strip towards the skirt.  
   
   
       8 . A push-off cap according to  claim 1 , characterised in that between in each case two adjacent break-off webs on the skirt there are formed support cams which reach down to approximately on the upper edge of the guarantee strip.  
   
   
       9 . A push-off cap according to  claim 1 , characterised in that this is manufactured without a mould slide by way of a chuck.  
   
   
       10 . A push-off cap according to  claim 1 , characterised in that the break-off webs with regard to their smallest diameter vary between 0.05 mm and 0.45 mm.  
   
   
       11 . A push-off cap according to  claim 2 , characterised in that the break-off webs in the region of the push-piece have a minimum diameter between 0.05 mm and 0.25 mm, more preferably between 0.15 mm and 0.25 mm.  
   
   
       12 . A push-off cap according to  claim 3 , characterised in that the break-off webs in the region lying diametrically opposite the push-piece have a minimum diameter between 0.2 mm and 0.45 mm, more preferably between 0.25 mm and 0.35 mm.  
   
   
       13 . A push-off cap according to  claim 8 , characterised in that the distance between the lower edge of the support cams and the upper edge of the guarantee strip lies in the region between 0.15 mm and 0.25 mm.