Rotating-Lid Tamper-Evident Container with Breakaway Locking

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Solution Overview

Problem

Existing food containers lack tamper-evidence and convenience, as they can be secretly unsealed, and lids often fall back shut due to gravity, complicating access to contents.

Innovation Solution

A tamper-evident container with a rotating lid featuring a pre-scored connecting portion and locking mechanisms that require breaking and rotating to open, ensuring the lid remains open and securely attached.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the lid is simply connected to the box body without a pivot, then the container structure is simple and easy to manufacture, but the lid falls back shut due to gravity and requires constant pushing or external support to remain open

Engineering Contradiction:

Improvecontainer structureVSAvoidlid operation

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent introduces a pivot connection between the lid and box body, transforming the static simple connection into a dynamic hinge joint. This allows the lid to rotate and remain open at various angles without requiring external support, resolving the contradiction between structural simplicity and operational convenience.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the container uses a sealed design without tamper-evident features, then the sealing is effective and the structure is simple, but unauthorized opening cannot be detected and food safety cannot be ensured

Engineering Contradiction:

Improvefood safetyVSAvoidcontainer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the container into separable components including a lid, box body, and tamper-evident sealing features. The sealing structure is segmented into first and second sealing portions that can be independently positioned and engaged, allowing tamper detection while maintaining effective sealing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent incorporates visual indicators (such as color-changing or position-indicating features) that show when the container has been opened or tampered with. These visual cues provide immediate tamper evidence without requiring complex electronic or mechanical detection systems.

Inventive Principle:

Principle #32Color changes

3Device complexity

If the lid is made to flip up and drop back by gravity, then no additional components are needed, but the container requires constant external support to remain open which reduces convenience

Engineering Contradiction:

Improvecontainer componentsVSAvoidaccess to food

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12404071B1Tamper-evident container with rotating lid

Publication Date: 2025.09.02 SHEN PLASTIC

AI summary

A tamper-evident container with a rotating lid is disclosed. The tamper-evident container includes a box body, the lid, and a pre-scored connecting portion connecting the box body and the lid. The horizontal end surface of the box body has a first locking portion, and the bottom surface of the lid has a second locking portion that can be detachably engaged with the first locking portion. When the lid is closed with the box body, the container is sealed. By breaking the pre-scored connecting portion, the lid can be horizontally rotated against the first locking portion and the second locking portion, so as to separate the lid from the box body. This structure allows for easy detection of tampering by observing the breakage of the pre-scored connecting portion and enables the container to remain open during use.