Double-Door Refrigerator Latch Structure for Pocket Access Control
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Solution Overview
Problem
Conventional refrigerators with a second door for accessing door pockets behind the first door are limited in size, allowing access to only some of the vertically arranged pockets without opening the first door, which restricts storage diversity and cooled air preservation.
Innovation Solution
A refrigerator design featuring a second door that can be opened independently of the first door, equipped with a door anti-opening unit that includes a striker and latch mechanism to control the second door's opening based on the first door's position, and magnetic seals to maintain airtightness and prevent unintentional opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a second door is added to access door pockets without opening the first door, then storage accessibility and cooled air preservation are improved, but device complexity increases
Solution Approach 1:
The first door is segmented into two independent doors: the main first door and a second door that can open independently. This segmentation allows selective access to door pockets without opening the entire first door, improving operational convenience while maintaining structural organization
Solution Approach 2:
The second door is nested within the first door structure, creating a door-within-a-door configuration. The second door is rotatably coupled to the first door, allowing it to function independently while being integrated into the overall door assembly, thus adding functionality without significantly increasing external dimensions
2Ease of operation
If the second door is made larger to access more door pockets, then storage accessibility is improved, but the risk of unintentional opening increases
Solution Approach 1:
A door anti-opening unit is implemented that applies preliminary restraining force to prevent unintentional opening of the second door. The unit includes a latch that engages with a striker on the second door, creating a mechanical interlock that must be deliberately disengaged, thus preventing accidental opening while allowing intentional access
Solution Approach 2:
The door anti-opening unit acts as an intermediary mechanism between the first door and the second door. It mediates the relationship by providing controlled restriction - the latch engages with the striker to prevent unwanted movement, but can be deliberately disengaged when access is needed, thus balancing stability and accessibility
3Reliability
If a door anti-opening unit is added to prevent unintentional opening, then door stability is improved, but device complexity increases
Solution Approach 1:
The door anti-opening unit is designed to automatically engage and disengage based on the state of the first door. When the first door opens, the anti-opening unit automatically releases the second door; when the first door closes, the unit automatically re-engages. This self-service mechanism reduces the need for additional control systems while maintaining reliability
Solution Approach 2:
The door anti-opening unit replaces complex electronic control systems with a purely mechanical solution. The latch and striker mechanism uses mechanical interlocking and spring-loaded engagement to provide automatic locking and unlocking functions, eliminating the need for sensors, motors, or electronic controls while maintaining reliability
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 access to multiple door pockets without opening the first door, minimizing cooled air discharge and enhancing storage flexibility while maintaining airtightness and preventing accidental opening of the second door.
Implementation Method 1
a magnetic seal may be provided between the door and the door frame
Data Source
AI summary
A refrigerator includes a first door that is rotatably provided so as to open/close a storage compartment, a second door that is rotatably provided in the front of the first door so as to open/close the first door, and a door anti-opening unit that prevents or allows opening of the second door depending on whether the first door is opened or closed. The door anti-opening unit prevents the second door from being unintentionally opened when the first door is opened.