Luggage Shell Grooves for Corner Impact Strength
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Solution Overview
Problem
Hard-sided luggage cases are prone to damage from impact loads, particularly at corner regions due to their curvature and reduced surface area, which existing reinforcement methods, such as adding thicker layers, are becoming less acceptable as they increase weight.
Innovation Solution
Incorporating surface features like grooves on the outer layer of the luggage case that deepen at the corners and gradually decrease as they extend across the main face and sides, forming a loop from one corner to an adjacent corner, to enhance corner strength and absorb impact forces without increasing material thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional layers or thicker material cross section are added to corner regions to increase structural strength, then corner strength is improved, but weight increases
Solution Approach 1:
The patent applies local quality by creating surface features (grooves, ridges, or other patterns) specifically in the corner regions of the luggage shell. These localized geometric modifications concentrate structural reinforcement exactly where impact forces are most likely to occur, rather than uniformly thickening the entire shell. The surface features alter the stress distribution locally, providing enhanced corner strength while maintaining the original overall shell thickness and weight.
Solution Approach 2:
The patent utilizes curvature principles by designing surface features with specific radii of curvature in the corner regions. The rounded or curved geometric patterns help distribute impact forces more evenly across the corner area, preventing stress concentration at sharp edges. This curvature-based approach enhances structural strength through geometric design rather than material addition, avoiding weight increase.
2Strength
If the shell structure is made more rigid to resist impact, then impact resistance is improved, but flexibility and ability to absorb impact energy decrease
Solution Approach 1:
The patent applies segmentation by dividing the continuous shell surface into distinct regions through surface features such as grooves or ridges. These segmented patterns create zones that can deform independently during impact, allowing the shell to absorb impact energy through controlled local deformation while maintaining overall structural integrity. The segmented design provides both rigidity for impact resistance and flexibility for energy absorption.
Solution Approach 2:
The patent utilizes parameter changes by varying the geometric parameters of the surface features (depth, width, spacing, curvature radius) to optimize the balance between rigidity and flexibility. By adjusting these parameters, the shell structure can be tuned to provide appropriate stiffness for impact resistance while retaining sufficient flexibility to absorb impact energy without permanent deformation.
Data Source
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AI summary
A luggage article (2) having surface features providing enhanced corner strength is provided. The luggage article may include a shell (4) at least partially formed by an outer layer (6), and including first and second shell portions (28) selectively secured together at a split line (26), the first shell portion defining a first corner region (24). The luggage article may include at least one first surface feature formed by the outer layer, the at least one first surface feature having a depth. The depth of the at least one first surface feature may be greater nearer the first corner region. The depth of the at least one first surface feature may decrease with distance away from the first corner region.