Door-In-Door Refrigerator Latch for Selective Outer Door Opening
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Solution Overview
Problem
In door-in-door refrigerators, users often accidentally open both the inner and outer doors when attempting to access only the outer door, leading to unintended access to the main compartment.
Innovation Solution
A latch system is integrated into the door-in-door refrigerator, featuring a trigger mechanism that allows users to selectively open either the outer door or both doors simultaneously by shifting between a latched and unlatched position, preventing accidental opening of both doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door-in-door refrigerator is designed with both inner and outer doors that can be opened independently, then users can access the specialty compartment (storage structure) without opening the main compartment, but users may accidentally open both doors simultaneously when attempting to open only the outer door
Solution Approach 1:
A latch mechanism acts as an intermediary between the inner and outer doors. The latch includes a trigger that, when activated, releases the connection between the two doors. This mediator allows the user to selectively control whether pulling the handle opens only the outer door or both doors together, thereby preventing accidental opening of the main compartment while maintaining ease of access to the specialty compartment.
2Reliability
If a latch mechanism is added to control selective door opening, then accidental opening of the main compartment is prevented, but the device complexity increases
Solution Approach 1:
The latch mechanism is segmented into distinct functional components: a trigger element that the user activates, a latching bar that physically connects the inner and outer doors, and a catch that secures the latched position. This segmentation allows each component to perform its specific function with simple geometry and clear movement paths, reducing overall complexity while maintaining reliable selective door opening control.
3Ease of operation
If the trigger is configured to move in a direction substantially parallel to the handle, then the latch can be easily activated by the user's natural hand motion, but the trigger mechanism requires additional space within the door structure
Solution Approach 1:
The trigger is designed to move in a direction substantially parallel to the handle (horizontal or vertical depending on handle orientation) rather than perpendicular to it. This dimensional change in trigger movement allows the user to activate the latch using a natural sliding motion of the fingers along the handle, improving ease of operation. The parallel movement direction optimizes the activation gesture while the trigger mechanism is compactly arranged within the door structure to minimize space requirements.
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
The latch system ensures convenient access to the specialty compartment by allowing users to open only the outer door while keeping the inner door closed, preventing accidental access to the main compartment.
Implementation Method 1
The latch further includes a spring configured to bias the latching bar into contact with the catch.
Data Source
AI summary
A door-in-door refrigerator includes a door having an inner door and an outer door. When the inner and outer doors are in open positions, food items stored in a main refrigerated compartment are accessible. When the inner and outer doors are in closed positions, the door seals the refrigerated compartment, and food items stored in the main refrigerated compartment are not accessible. When the inner door is in a closed position and the outer door is in an open position, food items stored in a storage structure coupled to the door are accessible. A latch includes a trigger that moves in a direction substantially parallel to a handle. Movement of the trigger shifts the latch between a latched position, in which pulling on the handle causes the inner and outer doors to open, and an unlatched position, in which pulling on the handle causes the outer door to open while the inner door remains closed.