Cooler Insert Profile With Undercut Latching Against Warping
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Solution Overview
Problem
Existing refrigeration appliance decorative profiles face issues with secure fit and aesthetic concerns due to manufacturing inaccuracies and thermal expansion problems, especially with large cross-sectional dimensions, leading to incomplete contact and warping.
Innovation Solution
A decorative profile design featuring an undercut edge and groove system with a coextruded metal and plastic structure, where the profile is pre-assembled and locked into place using a latching contour and ribs for stability, ensuring a firm and aesthetically pleasing attachment to the wall panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a decorative profile with large cross-sectional dimensions is used, then aesthetic appearance and coverage are improved, but manufacturing precision deteriorates due to warping from thermal expansion differences
Solution Approach 1:
The decorative profile uses a coextruded composite structure with an aluminum outer layer (0.2-0.4mm thick) providing aesthetic appearance and a plastic inner layer providing dimensional stability. This composite construction allows the profile to maintain large cross-sectional dimensions for aesthetic coverage while the plastic core compensates for thermal expansion differences, preventing warping and maintaining manufacturing precision.
2Manufacturing precision
If a thin metalized plastic profile is used, then manufacturing precision is improved, but aesthetic appearance deteriorates as it cannot be distinguished from plastic by touch
Solution Approach 1:
Instead of a thin metalized plastic profile, the invention uses a coextruded composite with a substantial aluminum layer (0.2-0.4mm) that provides both aesthetic metallic appearance and tactile feel, while the plastic core ensures manufacturing precision and dimensional stability. This solves the problem of plastic profiles feeling warm while achieving genuine metallic aesthetics.
3Ease of manufacture
If a decorative profile is attached without an undercut locking mechanism, then ease of manufacture is improved, but reliability deteriorates due to incomplete contact and insecure fit
Solution Approach 1:
The attachment mechanism is segmented into distinct functional elements: an undercut edge on the wall panel creating a locking contour, and a corresponding groove with locking protrusion on the decorative profile. This segmentation allows for simple assembly through snap-fit engagement while ensuring reliable secure fit through the undercut locking mechanism that prevents detachment.
4Reliability
If manufacturing tolerances are tight to ensure full contact, then reliability is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
Instead of relying on tight manufacturing tolerances, the invention changes the geometric parameters of the attachment interface by introducing an undercut edge that creates an interference-fit locking mechanism. This allows for larger manufacturing tolerances while maintaining reliable full contact, as the undercut geometry self-adjusts to ensure complete engagement between the decorative profile and wall panel.
Data Source
Figure 1~2
Figure 3~6
AI summary
Built-in part for a refrigeration appliance, in particular for a household refrigeration appliance, with at least one wall panel (5) having a free edge (15) and a decorative profile (4) slipped onto the free edge (15), the wall panel (5) opposite the free edge ( 15) is delimited by an undercut edge, and that the decorative profile (4) has a main panel (8) covering the wall panel (5) and a latching contour (11) engaging in an undercut (12) of the undercut edge.