Refrigerator Sub Door Handle Locking for Clean Access
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Solution Overview
Problem
Conventional refrigerators with sub doors often require a latch release button at the middle height, which compromises the sleek appearance and creates gaps where foreign matter can get stuck, making it difficult to access auxiliary storage compartments efficiently.
Innovation Solution
A handle mechanism on the sub door allows for selective coupling and uncoupling with the main door, enabling simultaneous opening of both doors when pulled and independent opening of the sub door when pushed, using a push rod and pivoting member system that prevents the hook member from re-engaging with the catching protrusion, thus maintaining a clean appearance and preventing air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a latch release button is provided at the middle height of the sub door, then the locking device can be released, but the appearance becomes compromised and gaps are created where foreign matter can get stuck
Solution Approach 1:
The handle and latch release mechanism are merged into a single integrated component. The handle itself performs the latch release function when pushed, eliminating the need for a separate latch release button. This integration maintains the sleek appearance of the sub door while preserving the ease of operation for releasing the locking device.
Solution Approach 2:
The handle is designed with multi-functionality: it serves both as a gripping element for opening the door and as the latch release mechanism. By pushing the handle, the user simultaneously activates the latch release function, making the handle a universal component that performs multiple operations without requiring additional elements that would compromise the door's appearance.
2Productivity
If the sub door is coupled to the main door, then both doors open simultaneously when the handle is pulled, but the sub door cannot be opened independently
Solution Approach 1:
The coupling between the sub door and main door is made dynamic rather than fixed. The hook member can selectively engage with or disengage from the catching protrusion based on the handle's position. When the handle is pulled, the hook engages the catching protrusion to couple the doors for simultaneous opening. When the handle is pushed, the hook disengages to allow independent sub door opening. This dynamic coupling provides both opening efficiency and flexibility.
Solution Approach 2:
The door opening function is segmented into two independent modes: coupled opening (both doors together) and independent opening (sub door only). The locking device is designed to allow selective engagement, enabling the user to choose the appropriate opening mode based on needs. This segmentation provides versatility while maintaining the efficiency of simultaneous opening when required.
3Reliability
If the hook member can re-engage with the catching protrusion after release, then the locking device can be reused, but air leakage occurs between the sub door and main door
Solution Approach 1:
The repulsion member is positioned to preemptively prevent the hook member from re-engaging with the catching protrusion after the sub door is separated from the main door. When the sub door is pulled away, the repulsion member (spring or elastic element) actively pushes the hook member away from the catching protrusion before any re-engagement can occur. This preliminary anti-action eliminates air leakage while maintaining the reliability of the locking device for subsequent use.
Solution Approach 2:
The repulsion member acts as an intermediary element between the hook member and the catching protrusion. Instead of allowing direct re-engagement that would cause air leakage, the repulsion member mediates the interaction by maintaining a separation force. This intermediary mechanism prevents harmful air leakage while preserving the functional reusability of the locking device for future coupling operations.
Data Source
AI summary
A refrigerator includes a cabinet having a storage compartment provided therein, a main door pivotably mounted at one side of the cabinet for opening and closing the storage compartment, an auxiliary storage compartment coupled to a rear of the main door, a sub door pivotably mounted at one side of the main door for opening and closing the auxiliary storage compartment, a locking device for selectively coupling the main door and the sub door to each other, a handle pivotably mounted at one side of the sub door for pivoting and opening the main door when pulled and releasing the locking device when pushed, and a lock control device mounted in the sub door for lock control with operation of the handle to release the locking device.