Door-in-Door Refrigerator Light Switch With Mechanical Actuation
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Solution Overview
Problem
Refrigerators with multiple doors face challenges in providing adequate lighting for each chamber without the need for separate wiring and switches, making it costly and difficult to implement.
Innovation Solution
A mechanical actuator system that activates a light switch when either the inner or outer door is opened, eliminating the need for individual electrical wiring for each door, allowing for efficient illumination of multiple food storage chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple switches and accompanying wiring are provided for each of the multiple doors, then adequate lighting for each chamber is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple door switch functions into a single switch mechanism. The actuator assembly integrates the functions of detecting both the inner door and outer door positions, eliminating the need for separate switches and wiring for each door while maintaining adequate lighting control for both chambers.
Solution Approach 2:
The single switch assembly is designed to perform multiple functions: it detects the position of both the inner door and outer door, and controls the lighting for both food storage chambers. This multi-functional design reduces the overall number of components and wiring required in the system.
2Ease of operation
If multiple switches and accompanying wiring are provided for each of the multiple doors, then lighting responsiveness to any door opening is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the switching functions for multiple doors into a single integrated switch assembly. This reduces manufacturing costs by eliminating the need to produce, install, and wire multiple separate switches, while still providing responsive lighting control when any door is opened.
Solution Approach 2:
The actuator assembly is designed to automatically detect door positions and trigger the lighting function without requiring complex external wiring or additional control systems. The mechanical design inherently provides the switching action needed for responsive lighting based on door state.
3Adaptability or versatility
If separate wiring is provided for each door switch, then individual door control is achieved, but installation difficulty increases
Solution Approach 1:
The patent combines the control functions for individual doors into a single switch assembly with a unified wiring connection. This maintains the ability to control lighting for each door independently through the actuator's design, while dramatically simplifying installation by requiring only one wiring connection instead of multiple separate wiring runs.
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
Enables cost-effective and efficient lighting for multiple food storage chambers in refrigerators by using a mechanical actuator to activate the light switch, improving accessibility and visibility without the complexity and expense of separate wiring for each door.
Implementation Method 1
A biasing member is engaged with the actuator to bias the actuator towards the forward position
Data Source
AI summary
A refrigerator appliance having a cabinet defining a food storage chamber, a first door, a second door rotatably mounted to the outer surface of the first door, a light, a switch in operative communication with the light, and an actuator. The switch and actuator are configured to turn the light on when the first door is in the open position, to turn the light on when the second door is in the open position, and to turn the light off when both the first door and the second door are in the respective closed positions.