refrigerator
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Solution Overview
Problem
Existing refrigerator designs pose safety risks and convenience issues due to the lack of mechanisms to prevent simultaneous opening of drawer doors, leading to potential damage and instability, especially when heavy food is stored, as they do not effectively restrict the operation of upper doors when lower doors are opened or elevated.
Innovation Solution
A refrigerator design featuring an upper door restriction unit and a lower door restriction unit, positioned on a partition member between the upper and lower doors, which restricts the opening of the upper door when the lower door is opened and vice versa, preventing simultaneous operation and maintaining stability by ensuring the upper door remains closed when the lower door is withdrawn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drawer door is disposed in a lower region to improve space utilization, then the refrigerator can store more items, but the user has to turn its back to take out items which causes inconvenience and safety issues
Solution Approach 1:
The drawer door is made dynamically elevatable rather than fixed, allowing it to rise to a convenient height for user access. The elevation mechanism includes a support member that can extend and retract, enabling the door to transition between a lowered storage position and an elevated access position, thus resolving the contradiction between space utilization and user convenience
2Ease of operation
If the drawer door is elevated to improve user convenience, then items are easier to access, but connection portions and electrical devices become exposed causing safety problems
Solution Approach 1:
The support member is nested within the drawer door structure when retracted, and the connection portions and electrical devices are housed within the door or support member housing. When the support member extends to elevate the door, these components remain enclosed rather than exposed, eliminating safety hazards while maintaining the elevation function for user convenience
3Ease of operation
If the upper door is opened when the lower door is elevated, then the user can access both compartments, but damage due to impact may occur
Solution Approach 1:
A sensor detects when the lower drawer door is in the elevated position and sends a signal to the control unit. The control unit then activates the upper door restriction mechanism, which prevents the upper door from opening by engaging a mechanical lock or blocking the hinge movement, thereby avoiding impact damage while still allowing the lower door to remain accessible
4Ease of operation
If multiple drawer doors are simultaneously opened, then the user can access all items, but the center of gravity is biased forward causing the refrigerator to fall down
Solution Approach 1:
Sensors on each drawer door detect their open/closed positions and communicate with the control unit. When the control unit detects that one drawer door is open, it activates the restriction mechanism for other drawer doors, preventing them from opening simultaneously. This feedback-based interlocking system maintains the refrigerator's center of gravity stability while still allowing sequential access to different compartments
Data Source
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AI summary
An embodiment of the present invention relates to a refrigerator, which includes: a cabinet that defines a storage chamber; an upper door that is configured to open and close a portion of the storage chamber by being drawn in and out; a lower door that is positioned below the upper door and that is configured to open and close the other portion of the storage chamber by being drawn in and out; an upper door restriction unit that is positioned in the storage chamber and selectively restricts the upper door when the lower door is opened and closed, and a lower door restriction unit that is positioned in the storage chamber and selectively restricts the lower door when the upper door is opened and closed. When both of the upper door and the lower door are closed, the upper door and the lower door maintain a non-restricted state, when the upper door is drawn out, the lower door restriction unit restricts the lower door, and when the lower door is drawn out, the upper door restriction unit restricts the upper door such that the upper door and the lower door are not simultaneously drawn out.