Tamper-Evident Closure With Ratchet Locking Mechanism

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Solution Overview

Problem

Existing tamper-evident systems for containers are difficult to design such that they cannot be reactivated to appear non-activated once opened, and they often rely on obstructing members that can be defeated by simple cutting operations, lacking robustness against tampering.

Innovation Solution

A tamper-evident closure system that generates unobstructed gaps between shell parts, using a ratchet arrangement and frangible lines, preventing return to the original position, and incorporating audible and tactile feedback mechanisms to enhance user experience and security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If obstructing members are used to prevent closure return, then tamper-evidence is provided, but the system can be defeated by simple cutting operations

Engineering Contradiction:

Improvetamper-evidence reliabilityVSAvoidvulnerability to cutting attacks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention removes the obstructing member entirely from the gap area, extracting the vulnerability to cutting attacks. The closure prevents return through a ratchet arrangement that locks the closure in the opened position without requiring any material to obstruct the gap, thereby eliminating the weakness to cutting operations while maintaining tamper-evidence reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention introduces a ratchet arrangement as an intermediary mechanism between the closure and the container opening. This ratchet system provides the preventing-return function without requiring obstructing members in the gap, mediating between the need for security and the vulnerability to cutting attacks

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the closure can be reapplied after removal, then the closure can be returned to its original position, but this defeats the tamper-evidence function

Engineering Contradiction:

Improveclosure reapplicationVSAvoidtamper-evidence integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention applies a ratchet arrangement that allows the closure to move freely in the opening direction but prevents return to the closed position. This dynamic asymmetric constraint ensures that once opened, the closure cannot be reapplied, maintaining tamper-evidence integrity while still allowing easy opening operation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention inverts the traditional approach by using a ratchet mechanism that permits forward motion (opening) but blocks reverse motion (reapplication). This inversion of the bidirectional constraint into a unidirectional constraint ensures that the closure can be easily opened but cannot be reapplied, preserving tamper-evidence

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP2785606B1A tamper-evident closure

Publication Date: 2018.03.21 OBRIST CLOSURES SWITZERLAND GMBH

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AI summary

A tamper-evident closure (110) for a container is provided. The closure (110) comprises two or more parts (150, 145, 135) and being movable from a first position to a second position in an opening event, the movement to the second position generates two or more gaps (G1, G2) between and/or within the parts, the closure comprising (110) means for preventing closing of the gaps whereby to confirm the opening event has occurred.