Household refrigeration device with insertion part
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Solution Overview
Problem
Conventional refrigeration devices face challenges in securely anchoring built-in parts due to thin wall thickness in areas with cams or pins, which are prone to damage and difficult to repair, as the material is overstretched during deep-drawing, leading to insufficient mechanical strength and incomplete foam stabilization.
Innovation Solution
The design features elongated supports with recesses on the inner container's side walls, allowing for a thicker wall thickness and reduced material stretching, with a latching element like a rib section and an elastic tongue for secure anchoring of built-in parts, enabling both detachable and non-detachable locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cams or pins are formed from the side walls during deep drawing to anchor built-in parts, then the anchoring function is achieved, but the wall thickness becomes very thin and mechanical strength is compromised
Solution Approach 1:
The anchoring function is segmented into two independent parts: the support structure (elongated supports with recesses) and the locking element (separate component with protrusions). This separation allows the support to maintain adequate wall thickness for structural integrity while the locking element provides the anchoring function, resolving the contradiction between reliability and strength.
Solution Approach 2:
The locking element is extracted as a separate component from the inner container wall. Instead of forming cams or pins directly from the stretched wall material, the patent uses distinct locking elements that engage with recesses in the supports, thereby preserving the wall thickness and mechanical strength of the inner container while achieving reliable anchoring.
2Reliability
If cams are formed during deep drawing to provide anchoring, then anchoring is achieved, but the cam is not fully stabilized by foam and is prone to damage
Solution Approach 1:
The anchoring system is segmented so that the load-bearing anchoring function is performed by the locking elements engaging with recesses, while the elongated supports provide structural continuity. This segmentation allows the foam to properly stabilize the support structure without the concentrated stress points that make cams susceptible to damage.
Solution Approach 2:
The design inherently provides cushioning by distributing the anchoring load across multiple elongated supports with recesses rather than concentrating it in thin-walled cams. The foam filling stabilizes the supports before operation, preventing the kind of damage that occurs to unstabilized cams during normal use.
3Shape
If the inner container wall is highly stretched during deep drawing to form side walls, then the container shape is achieved, but subsequent lug formation causes excessive stretching and thin wall thickness
Solution Approach 1:
The manufacturing process is segmented into two stages: first forming the container shape with adequate wall thickness, then adding anchoring features (recesses in supports and separate locking elements) that require minimal additional stretching. This avoids the double-stretching problem that occurs when lugs are formed from already-stretched side walls.
Solution Approach 2:
The anchoring features are designed with local quality in mind: recesses are formed in the elongated supports at locations requiring minimal material stretching, and separate locking elements are used where stretching would be excessive. This maintains manufacturing precision and wall thickness uniformity while achieving the necessary anchoring function.
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 solution provides a robust and cost-effective method to securely anchor built-in parts, enhancing mechanical strength and ease of manufacturing, while allowing for easy assembly and secure retention of components like refrigerated goods supports and grates, with reduced risk of damage during operation.
Implementation Method 1
attachment parts with a second locking device are attached to the evaporator level or the receptacle and the first locking device forms a locking connection with the second locking device
Data Source
Figure 1~4
Figure 5~8
AI summary
The invention relates to a household refrigeration device having an inner container (1) which on the side walls (2, 3) thereof supports elongate contact supports (4) lying opposite each other, at the same height, on which an insertion part (6, 7) is supported. The invention is characterized in that one of the contact supports (4) has a recess (5) or a projection, at least locally, which works together in a form-fit with a locking element (16) of the insertion part (6, 7).