Plastic closing device comprising a cutting collar

Abstract

The invention relates to a plastic closing device comprising a pouring part ( 1 ) for fixing onto packaging, a screw cap ( 2 ) that can be screwed onto the pouring part ( 1 ) and a self-opening collar ( 3 ) in the pouring part ( 1 ) that can be moved downwards with a screw action onto the packaging in order to open the latter. The screw cap ( 2 ) has a follower ( 24 ), which acts on a stop element ( 36 ) of the self-opening collar ( 3 ) and which, when the screw cap ( 2 ) is first opened, moves the self-opening collar ( 3 ) inside the pouring part ( 1 ) into a lower position onto the packaging in order to open the latter. When the pouring part ( 1 ) is subsequently closed by the screw cap ( 2 ), the self-opening collar ( 3 ) remains in the lower position. The self-opening collar has several cutting and/or piercing elements ( 32 a , 32 b ) with a substantially quadrangular basic form. Said form is interrupted by a lower longitudinal edge comprising a sloping and a longer and flatter rising region. Said form makes the closing device suitable for various types of packaging.

1 . A plastic closing device comprising
 a pouring part for fixing onto a packaging,   a screw caps adapted to be screwed onto the pouring part, and   a self-opening collar adapted to be moved downwards in the pouring part towards the packaging with a screw action for opening the packaging,   wherein the screw cap comprises at least one driver, which acts on at least one stop element of the self-opening collar and which causes the self-opening collar to move within the pouring part into a lower position towards the packaging in order to open said packaging when the screw cap is first opened, and which causes the self-opening collar to remain in its lower position when the pouring part is subsequently closed by means of the screw cap, and   wherein the self-opening collar comprises at least two downwards-projecting cutting or piercing elements arranged along a periphery of the self-opening collar and forming a lower edge thereof,   wherein the cutting or piercing elements have a substantially rectangular form, wherein a downwardly projecting longitudinal edge interrupts the rectangular form and forms a downwardly projecting triangle, thus creating a downwardly projecting tip,   wherein the longitudinal edge has, at its front relative to the direction of rotation of the collar, a portion that declines downwards and a portion which subsequently rises again, and   wherein the rising portion is longer and flatter than the declining portion.   
   
   
       2 . The closing device according to  claim 1 , wherein the rising portion of the longitudinal edge has a length that is at least 2.5 times the length of the declining portion. 
   
   
       3 . The closing device according to  claim 1 , wherein an obtuse angle is present between the rising portion and the declining portion of the longitudinal edge. 
   
   
       4 . The closing device according to  claim 1 , wherein the downwardly projecting longitudinal edge forms a cutting edge at least in its declining portion. 
   
   
       5 . The closing device according to  claim 4 , wherein the downwardly projecting longitudinal edge forms a cutting edge in its declining portion as well as in its rising portion. 
   
   
       6 . The closing device according to  claim 4 , wherein the cutting edge is provided on an inner peripheral surface of the self-opening collar. 
   
   
       7 . The closing device according to  claim 1 , wherein the cutting or piercing elements project downwards to the same extent. 
   
   
       8 . The closing device according to  claim 1 , wherein the cutting or piercing elements are arranged along the periphery so as to be distributed at the same distance. 
   
   
       9 . The closing device according to  claim 1 , wherein the self-opening collar comprises four to six cutting or piercing elements. 
   
   
       10 . The closing device according to  claim 1 , wherein the self-opening collar comprises at least one hold-down element, which forms the lower edge together with the cutting or piercing elements. 
   
   
       11 . The closing device according to  claim 10 , wherein the self-opening collar comprises three to five cutting or piercing elements and one hold-down element. 
   
   
       12 . The closing device according to  claim 1 , wherein the self-opening collar comprises an external thread, and
 wherein the pouring part comprises an internal thread that cogs with said external thread, so that the self-opening collar rotates when being moved downward.   
   
   
       13 . The closing device according to  claim 12 , wherein the external thread has a pitch, which is chosen in such a manner that the self-opening collar performs a rotation of less than 360 degrees, in response to the unscrewing of the screw cap. 
   
   
       14 . The closing device according to  claim 1 , comprising a single driver. 
   
   
       15 . The closing device according to  claim 1 , comprising a tamper-proof strip having first bars, the tamper-proof strip being connected to the cap and surrounding said cap at least partially,
 wherein second bars comprising projecting lugs, which run parallel to a tangent of a pouring spout are provided on a flange of the pouring part, and   wherein the bars of the tamper-proof strip engage the bars of the pouring part.   
   
   
       16 . (canceled) 
   
   
       17 . (canceled)