Hinged Container Flap Locking Tab Over-Rotation Control
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Solution Overview
Problem
Existing container designs with opening flaps often suffer from leakage, unpredictable opening, and over-rotation issues, particularly when subjected to force or weight, leading to insecure closure and potential contents loss.
Innovation Solution
A container design featuring a top panel with a hinge, an opening flap connected to the hinge, and a locking tab mechanism that engages with a free end portion seat to prevent over-rotation and ensure secure closure, characterized by a nonoverlapping relationship between the opening flap edges and the top panel, allowing for controlled separation and deformation to facilitate locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening flap is made to tightly seal to the container using a wedge seal, then the sealing performance is improved, but the opening flap becomes difficult to open
Solution Approach 1:
The opening flap is segmented into a first portion and a second portion that can move relative to each other. The first portion maintains the seal with the container body, while the second portion can be lifted independently to open the container. This segmentation allows the seal to remain tight while enabling easy opening by lifting only the second portion.
Solution Approach 2:
The opening flap transitions from a static, rigid structure to a dynamic, multi-position structure. The flap can exist in a closed sealed position, an intermediate partially open position, and a fully open position. This dynamic capability allows the flap to maintain sealing when closed while enabling easy access when opened.
2Ease of manufacture
If the opening flap is designed as a partial cutout with through cut, then the manufacturing complexity is reduced and access is improved, but the opening flap becomes prone to over-rotation and pushing into the container interior
Solution Approach 1:
The opening flap is divided into a first portion attached to the container body and a second portion that can move independently. The second portion includes a free end that can be lifted to open the container without the entire flap rotating uncontrollably. This segmentation provides stability while maintaining manufacturing simplicity.
Solution Approach 2:
Different portions of the opening flap have different properties: the first portion is fixed and provides structural stability, while the second portion is movable and provides controlled opening functionality. This local differentiation allows the flap to resist over-rotation while maintaining ease of manufacture.
3Strength
If the opening flap is tucked closed into the inner periphery of the container, then the closing force is improved, but the opening flap becomes leaky and unpredictably pops open
Solution Approach 1:
The opening flap is segmented into a first portion that provides closing force by engaging with the container body, and a second portion that maintains a controlled relationship with the first portion. This segmentation allows the flap to apply sufficient closing force while preventing unpredictable popping open through the controlled movement capability of the second portion.
4Strength
If the opening flap edges overlap with the top panel, then the structural integrity is improved, but the locking mechanism cannot engage properly
Solution Approach 1:
The opening flap is divided into a first portion that overlaps with the top panel to provide structural integrity, and a second portion that includes the free end capable of lifting to engage the locking mechanism. This segmentation allows both overlapping for strength and proper locking engagement to coexist.
Data Source
Figure 1
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AI summary
A container having a hinged opening flap having free end portion. The free end portion comes into facing relationship with a free end portion seat. One or more locking tabs connected to the opening flap or the free end portion seat edge are provided. The locking tabs can lock the opening flap into a closed position. The container can be erected from a blank.