Refrigerator Door Automatic Push-Rod Opening for Hands-Free Access
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Solution Overview
Problem
Conventional refrigerators require users to apply significant force to open the door due to magnetic gaskets, and existing door opening devices often have long rods or require both hands, making it inconvenient, especially when holding objects.
Innovation Solution
A door opening system that includes a push rod driven by a motor, with sensors and detection devices to automatically open the door by detecting a user's presence, allowing hands-free operation and easy access even when carrying items.
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:
The door opening device is activated in advance by a sensor detecting user approach, automatically pushing the door open before the user needs to manually pull it, thereby preparing the system to overcome the magnetic adhesion force without requiring user effort
Solution Approach 2:
The manual mechanical action of pulling the door against magnetic force is replaced by an automated electromechanical system comprising a sensor, control unit, and motor-driven pushing mechanism that automatically opens the door
2Force
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 occupies more space
Solution Approach 1:
The rod is designed as a dynamic component that rotates and extends only when needed to push the door open, then returns to a compact retracted position, transforming from a static long structure to a dynamically deployable mechanism that minimizes space when not in use
Solution Approach 2:
The door opening function is divided into distinct operational phases: sensor detection, rod extension to pushing position, door pushing action, and rod retraction, allowing the mechanism to achieve long lever arm benefits only when needed while maintaining compact form otherwise
3Force
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 both hands are occupied
Solution Approach 1:
The mechanical manual operation of the door handle is replaced by an automated sensing system using optical or proximity sensors that detect user presence and trigger the door opening mechanism automatically, eliminating the need for hand operation
Solution Approach 2:
The door opening system serves itself by automatically detecting when opening is needed through sensor input and executing the opening action without requiring user intervention, making the system hands-free operable
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 force required to open the door, and prevents accidental openings due to misrecognition of animals or children, while maintaining reliable operation and efficient space usage within the refrigerator.
Implementation Method 1
a magnet is provided inside the gasket, and the gasket becomes in close contact with the cabinet formed of a steel material when the door is closed
Implementation Method 2
sensors and detection devices to automatically open the door by detecting a user's presence
Data Source
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AI summary
Provided is a refrigerator (1) and control method for refrigerator and method foropening a refrigerator door (20). While a user is holding an object in both hands, adoor (20) may be automatically and additionally opened using another part of abody other than hands.