Refrigerator Door Opening Sensor for Hands-Free Access
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Solution Overview
Problem
Conventional refrigerators require users to use both hands to open the door, which can be inconvenient, especially when carrying objects, and existing solutions like voice-activated or motion-sensing door opening systems face issues with misrecognition and operational complexity.
Innovation Solution
A refrigerator with a sensing assembly that projects an image on the floor and detects user operation using a detection device, allowing the door to be opened automatically by a part of the body, such as the foot, without the need for both hands, while minimizing misrecognition and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnet is provided inside the gasket to increase adhesion with the cabinet, then the leaking of cool air is decreased, but a greater force is required to open the door
Solution Approach 1:
A door opening device is activated before the user opens the door to preliminarily separate the door from the cabinet body, overcoming the magnetic adhesion force of the gasket. The device includes a rod that pushes the door away from the cabinet when activated by a sensor detecting the user's approach, thereby reducing the force needed by the user to open the door while maintaining strong sealing when closed
2Ease of operation
If a door opening device with a long rod is used to push the door open from a position distant from the hinge shaft, then the door can be opened with less force, but the device becomes more complex and longer
Solution Approach 1:
The door opening device uses a dynamic rod that can extend and retract. When the door needs to be opened, the rod extends to reach the optimal push position on the door that maximizes leverage. When not in use, the rod retracts to minimize space occupation and reduce apparent device complexity. This dynamic adjustment allows effective door opening with variable rod length
3Ease of operation
If an operating part on the door handle is required to activate the door opening device, then the door can be opened with assistance, but it cannot be operated when the user is holding objects with both hands
Solution Approach 1:
The manual operation of the door handle is replaced with an automatic sensing system. A sensor (such as an infrared sensor or proximity sensor) detects when a user approaches the refrigerator, and automatically activates the door opening device without requiring the user to manually operate the handle. This substitution of mechanical operation with automated sensing enables hands-free door opening when users are carrying objects
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
Enhances user convenience by enabling hands-free door opening, reduces the risk of misrecognition, and simplifies the assembly and operation of the door opening mechanism, ensuring reliable and efficient automatic door operation.
Implementation Method 1
A refrigerator with a sensing assembly that projects an image on the floor and detects user operation using a detection device
Data Source
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AI summary
Provided is a refrigerator and control method for refrigerator and method for opening a refrigerator door. While a user is holding an object in both hands, a door may be automatically and additionally opened using another part of a body other than hands.