Metal Shelf Edge Structure With Hidden Internal Welds
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Solution Overview
Problem
Existing metal shelves, particularly serving trolleys, face issues with surface tarnishing and oxidation due to visible weld seams, requiring post-processing to maintain a visually flawless appearance, which is challenging especially when welds are on outer edges.
Innovation Solution
The shelf design features notches at its corners matching the cross-section of vertical metal profiles, with folds doubled inwardly for internal welding or soldering, preventing visible surface changes and allowing for easy formation with mixed gases, thus eliminating the need for post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shelf is fastened to vertical metal profiles using external welding, then the connection strength is sufficient, but the visible weld seams cause surface tarnishing and oxidation that require post-processing
Solution Approach 1:
The weld seam is extracted from the visible outer surface and relocated to the internal structure. By folding the shelf edge inward and performing welding from the inside, the harmful visual effect of weld seams is removed while maintaining the connection strength function
Solution Approach 2:
Instead of welding from the outside as is conventional, the welding is performed from the inside of the folded shelf edge. This inversion of the welding direction allows the weld seam to be hidden within the folded structure, eliminating the need for surface post-processing
2Ease of manufacture
If the shelf edge is folded inward with double layers for internal welding, then visible surface changes are avoided, but the structural complexity increases
Solution Approach 1:
The folded shelf edge serves multiple functions simultaneously: it provides structural reinforcement, creates an internal cavity for hidden welding, and maintains a clean external appearance. This multi-functionality justifies the additional folding step
3Reliability
If the shelf is made entirely of metal for stability and ease of cleaning, then the structural integrity and hygiene properties are improved, but the visual appearance deteriorates due to visible weld seams and surface changes
Solution Approach 1:
The weld seam, which causes visual deterioration, is extracted from the visible surface and relocated to the internal structure through inward folding, allowing the metal shelf to maintain both its hygiene properties and visual appearance
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
This design maintains the optical quality of polished or ground surfaces by hiding the weld seams internally, enhancing stability and load-bearing capacity while reducing production costs and visual disturbances.
Implementation Method 1
the material connection between the metal profiles and the shelf is formed by a welded or soldered connection
Implementation Method 2
the material connection between the metal profiles and the shelf is formed by a welded or soldered connection
Implementation Method 3
surface changes such as tarnishing or oxidation are greatly reduced or completely avoided
Data Source
Figure 1
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AI summary
The shelf system comprises metal profile uprights (1) and sheet metal shelves (2), The shelf edges (3) are at right angles to the shelf itself and the corners have notches whose cross-section corresponds to that of the profile. The bottom of each edge is bent back upwards inside it and the inner section (5) welded or soldered to the profile. An independent claim is included for a method for fixing a shelf to an upright as described.