Leaf-Spring Flipper Mullion for Magnet-Free Door Sealing
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Solution Overview
Problem
Refrigerator mullion assemblies relying on magnets for sealing between doors and cabinets are costly and difficult to incorporate, necessitating a magnet-free solution for efficient operation.
Innovation Solution
A mullion assembly with a rotatably movable mullion portion attached to a door via a hinge assembly, utilizing a leaf spring and cam structure to maintain the mullion in closed or open positions, eliminating the need for magnets by using a cam structure with recesses and a stopper to control movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are used to pull the mullion assembly between opened and closed positions, then sealing effectiveness is improved, but cost and manufacturing difficulty increase
Solution Approach 1:
The patent removes magnets from the mullion assembly entirely, extracting the problematic component while preserving the sealing function through a mechanical alternative. The mullion assembly is redesigned to use a cam mechanism and hinge system that achieves the same sealing effectiveness without requiring expensive, difficult-to-incorporate magnets.
Solution Approach 2:
The patent replaces the magnetic field-based holding mechanism with a purely mechanical system consisting of a cam structure, recesses, and hinge assembly. This mechanical substitution eliminates the need for magnets while maintaining the ability to hold the mullion in closed and open positions effectively.
2Reliability
If magnets are used to pull the mullion assembly, then sealing effectiveness is improved, but cost increases
Solution Approach 1:
The patent removes magnets from the mullion assembly entirely, extracting the problematic component while preserving the sealing function through a mechanical alternative. The mullion assembly is redesigned to use a cam mechanism and hinge system that achieves the same sealing effectiveness without requiring expensive, difficult-to-incorporate magnets.
Solution Approach 2:
The patent employs simple, inexpensive mechanical components (cam structure, recesses, hinge assembly) to replace expensive magnets. These mechanical parts are easier and more cost-effective to manufacture and incorporate into the refrigerator door assembly.
3Device complexity
If a cam structure with recesses is used to control mullion movement, then device complexity is reduced, but control precision over mullion position may worsen
Solution Approach 1:
The patent uses a dynamic cam mechanism that rotates to different positions (first and second recesses) to control the mullion's position. The hinge assembly allows rotational movement that dynamically adjusts the mullion between closed and open states, providing precise control through mechanical motion rather than static magnetic holding.
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 effective sealing and reduces the likelihood of unintended mullion movement, enhancing operational efficiency and cost-effectiveness by eliminating the need for expensive magnets.
Implementation Method 1
a leaf spring and a cam structure. The cam structure comprises a first recess for receiving the leaf spring when the mullion portion is in the first position
Implementation Method 2
The cam structure comprises a first recess for receiving the leaf spring when the mullion portion is in the first position. The cam structure further comprises a second recess for receiving the leaf spring when the mullion portion is in the second position
Data Source
AI summary
A refrigerator assembly includes a cabinet having one or more compartments and a door configured to provide access to the one or more compartments. The refrigerator assembly further includes a mullion portion movably attached with respect the door and a hinge assembly attaching the mullion portion to the door such that the mullion portion is rotatably movable with respect to the door about a rotational axis between a first position and a second position. The refrigerator assembly further includes a leaf spring and a cam structure. The cam structure includes a first recess for receiving the leaf spring when the mullion portion is in the first position. The cam structure further includes a second recess for receiving the leaf spring when the mullion portion is in the second position.