Tamper-Evident Strip with Bent Ends for Anti-Swivel Closure
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Solution Overview
Problem
Existing tamper-evident closures allow the tamper-evident strip to be swivelled forward, potentially allowing the lid to be opened without removing the strip, compromising security.
Innovation Solution
The recess in the closure is designed to match the height and length of the tamper-evident strip, with a small gap between the outer contour and the strip, and an indent below for finger engagement, preventing swivelling by making the strip's edges unreachable, and featuring inwardly bent end portions and strategically placed frangible connection points to ensure the strip is torn off during first-time opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the recess is designed with greater length than the tamper-evident strip, then the strip can be easily grabbed and removed, but the strip can be swivelled forward allowing the lid to be opened without removing the strip
Solution Approach 1:
The recess is designed with specific local dimensions where its length corresponds essentially to the length of the tamper-evident strip and its height essentially corresponds to the height of the strip, creating a precisely fitted receptacle that prevents swivelling while maintaining ease of removal through the indent feature
Solution Approach 2:
An indent is added to the body below the recess, providing a new dimensional feature for finger engagement from below. This allows the strip to be pulled upward in one movement, solving the contradiction by enabling easy removal without creating swivelling vulnerability
2Ease of operation
If the end portions of the tamper-evident strip are made reachable, then the strip can be easily grasped for removal, but the strip can be swivelled forward compromising security
Solution Approach 1:
The end portions of the tamper-evident strip are designed to be essentially unreachable from the front, with only a small gap between the outer contour of the recess and the strip. This local design feature prevents grasping for swivelling while maintaining security
Solution Approach 2:
Instead of making the ends reachable from the front for grasping, the design inverts the approach by providing an indent below the recess that allows finger engagement from below. This enables the strip to be pulled upward for removal without exposing the ends to swivelling attacks from the front
Data Source
AI summary
A tamper-evident closure includes a tamper-evident strip connected with frangible connection points to a shoulder portion of a closure body before first time opening of the closure. In the closed position of a lid, a skirt portion of the lid is located behind the tamper-evident strip. The skirt portion includes locking lugs that protrude from the outer skirt surface towards the front and in the closed position of the lid engage an underside of the tamper-evident strip, such that upon a first-time opening the lid is only movable to the open position when the tamper-evident strip is permanently removed by breaking the frangible connecting points. The tamper-evident strip has bent end portions with frangible connection points that are bent towards the skirt portion, whereby a virtual straight line through these frangible connection points, seen from the front, lies behind a virtual straight line through the other frangible connection points.