Thereated cap provided with tamper-evident band

Abstract

A container having a neck ( 2 ), which surrounds an opening ( 3 ) in the container, and a plastic collar ( 21 ), which can be screwed onto the neck and has a top side and an underside and an outer circumference. The neck is provided with a first screw thread and the collar is provided with a second screw thread ( 24 ). Beneath the fist screw thread, the neck is provided with a blocking rib ( 7 ) which projects nalially outwards. On the underside, the collar is provided with a tamper-evident ring ( 25 ), which ring is provided, on the inner circumference, with inwardly projecting flexible blocking members ( 27 ), which are distributed around the circumference, in such a manner that when the collar is being screwed onto the neck the flexible blocking members pass over the blocking rib, and when the collar is being unscrewed the blociccng rib forms a stop for the blocking members, resulting in one or more parts of the collar being broken.

1 . A combination of a container having a neck ( 2 ), which surrounds an opening ( 3 ) in the container, and a plastic collar ( 21 ), which can be screwed onto the neck and has a top side and an underside and an outer circumference, the neck ( 2 ) being provided with a first screw thread ( 6 ) and the collar ( 21 ) being provided with a second screw thread ( 24 ), which is complementary to the first screw thread in order for the collar to be screwed onto the neck, and the neck of the container being provided, beneath the first screw thread, with a blocking rib ( 7 ) which projects radially outwards, and the collar being provided on the underside with a tamper-evident ring ( 25 ), which ring is provided on the inner circumference with inwardly projecting flexible blocking members ( 27 ), which are distributed around the circumference, in such a manner that when the collar is screwed onto the neck the flexible blocking members ( 27 ) pass over the blocking rib, and when the collar ( 21 ) is being unscrewed the blocking rib forms a stop for the blocking members ( 27 ), resulting in one or more parts of the collar breaking, the tamper-evident ring ( 25 ) comprising a plurality of ring segments ( 26 ) which lie next to one another in the circumferential direction, each ring segment ( 26 ) being provided, on the inner side, with a blocking member ( 27 ), and each ring segment ( 26 ), via at least one unbreakable and flexible connecting body ( 28 ), being integral with the collar, and each ring segment ( 26 ) being connected, via breakable bridges ( 30 ), to the adjacent ring segments, in such a manner that when the collar ( 21 ) is unscrewed for the first time, the blocking members ( 27 ) come into contact with the blocking rib ( 7 ) and break one or more breakable bridges ( 30 ) of the tamper-evident ring ( 25 ), so that the ring segment ( 26 ) with the blocking members ( 27 ) can move outwards and the blocking members can move past the blocking rib, wherein each connecting body ( 28 ) extends radially inwards from the top side of the ring segment ( 26 ), and each ring segment ( 26 ) has an associated single connecting body ( 28 ) which extends over a smaller circumferential angle than the associated ring segment, so that there is an opening ( 29 ) between circumferentially successive connecting bodies ( 28 ), and the blocking member ( 27 ) which is associated with a ring segment ( 26 ) being arranged offset, as seen in the circumferential direction, with respect to the connecting body ( 28 ).  
   
   
       2 . The combination according to  claim 1 , wherein a blocking member ( 27 ) is a lip which projects obliquely upwards and inwards from the inner side of the ring segment ( 26 ).  
   
   
       3 . The combination according to  claim 1  wherein the breakable bridges ( 30 ) are located in the vicinity of the underside of the ring segments ( 26 ).  
   
   
       4 . The combination according to  claim 1  wherein the collar ( 21 ) forms part of a closure member for closing the opening in the neck of the container, in particular of a screw cap ( 20 ).  
   
   
       5 . Plastic collar according to  claim 1  which can be screwed onto a neck ( 2 ) of a container.