Screw cap with anti-tamper strip

US5893474A · kind A · utility

Assignee

• Crown Cork · CH

Inventors

• Klaus Herrmann · Nuremberg, DE
• Michael Kirchgessner · Egringen, DE

Key dates

• Filing date: Feb 20, 1996
• Grant date: Apr 13, 1999
• Expiry date: Feb 20, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65D2401/35
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A plastic anti-tamper strip (3) is provided at the lower edge of a screw cap (1). Bridges (20) form an approximately horizontal nominal rupture line, along which the anti-tamper strip can be separated from the screw cap (1) when a container, closed by said screw cap, is opened for the first time. A bead (8) is provided on the screw cap (1) which engages interlockingly with a bead (4) on the container mouth (2). The anti-tamper strip (3) also possesses at least one approximately vertical nominal rupture point (11). Adjacent to the nominal rupture point (11), a relief zone is provided, the stretchability of which increases towards the lower edge (19) of the anti-tamper strip (3).