Carton Handle Strap Flexing for Stress Distribution
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Solution Overview
Problem
Existing cartons with carrying handles are either too material-intensive or lack sufficient strength and accessibility for efficiently handling and transporting large weights of articles, while also being aesthetically pleasing and environmentally friendly.
Innovation Solution
A carton design featuring a handle panel with a strap member and strategically placed cutaways and fold lines that allow the strap to flex outwardly when a force is applied, distributing stress to the ends of the carton and maintaining structural integrity, while also allowing for easy formation from minimal materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handle structure is added to the carton, then carrying capability and accessibility are improved, but material usage and structural complexity increase
Solution Approach 1:
The handle structure is segmented into a strap member and corner panels that can move independently. The cutaways create discrete zones that allow controlled movement of corner panels without requiring complex mechanisms throughout the entire handle structure.
Solution Approach 2:
The handle structure uses the applied lifting force itself to trigger the mechanical response. When upward force is applied to the grip region, it automatically causes the corner panels to displace and the strap to flex outwardly through the cutaway mechanisms, without requiring external actuators or complex control systems.
2Strength
If the handle structure is made robust to handle large weights, then strength is improved, but material usage increases
Solution Approach 1:
The handle structure transitions from a static rigid design to a dynamic flexible system. The strap member is designed to flex outwardly when loaded, and the corner panels are designed to displace along defined paths through the cutaways, allowing the structure to adapt to applied forces without requiring excessive material for rigidity.
Solution Approach 2:
The structural parameters of the handle change in response to applied load. The strap member's curvature changes as it flexes outwardly, and the corner panels change position relative to the handle panel. These parameter changes allow the structure to distribute stress effectively while using minimal material.
3Ease of operation
If cutaways are added to facilitate strap flexing, then ease of operation is improved, but structural integrity may be compromised
Solution Approach 1:
The cutaways are strategically positioned only at specific locations where corner panels need to displace, rather than creating general weaknesses throughout the structure. The strap member remains substantially disjoined from the handle panel at controlled locations, providing flexibility where needed while maintaining structural integrity in critical load-bearing regions.
Solution Approach 2:
The corner panels act as intermediary elements between the rigid handle panel and the flexible strap member. They facilitate the mechanical coupling and decoupling through the cutaways, allowing controlled movement and flexing while maintaining overall structural coherence and load-bearing capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a robust, accessible, and environmentally friendly handle structure that effectively distributes stress, ensuring the carton's structural integrity and ease of use while minimizing material usage.
Implementation Method 1
the strap member is encouraged to flex substantially outwardly of the plane to a biased position above the plane
Data Source
AI summary
A handle structure (H) for a carton having a handle panel (12, 20) includes a strap member integrally conjoined with the handle panel and extending substantially between the opposing end edges (21a, 21c, 29a, 29c) of the handle panel. The strap member has opposing strap edges substantially disjoined from the handle panel and includes a substantially centrally disposed grip region (HI, H2). A severance line segment (65a, 67a) is disposed proximate each corner of the handle panel and extends from a first end point proximate that corner to a second end point proximate the grip region such that when force (F) normal to the plane of the handle panel is exerted upon the grip region, the strap member is flexed substantially outwardly of the plane to a biased position above the plane. The handle structure further includes a pair of first and second fold lines (79a, 77a) extending from each severance line segment and converging towards the adjacent corner of the handle panel.