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Pilfer-proof closure for containers and injection mould for producing the closure

  • US 5,086,938 A
  • Filed: 07/26/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 02/16/1988
  • Status: Expired due to Fees
First Claim
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1. A pilfer-proof closure for containers, such as bottles and the like, havinga closure cap (1) of plastic designed as a screw cap, the shell (2) of which is connected in the region of the inner circumference of the shell, via tear-off webs (7) to a pilfer-proof strip (8), the outside of which has a wall section (9) running obliquely outwardly and downwardly adjoining the webs and which on its inside bears at least one retention member (14) which extends into the inner space bounded by the pilfer-proof strip and, when the closure cap has been screwed onto the container orifice, engages beneath an annular snap-on projection (6) of the container arranged below the screw thread (5) of the container,the pilfer-proof strip having on its inside, in the region of the retention member, a circumferential recess (11) which is open towards the lower end of the pilfer-proof strip, which runs essentially axially and defines an upper wall section (12) and from the upper section (12) of which the retention member (14) extends,characterized in thatin axial section, the retention member (14) has inner and outer faces andin that the radial depth (z) of the circumferential recess (11) is at least equal to the maximum width (x) of the retention member (14) in axial section.

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