Rotating Refrigerator Door Shelf Guard for Easier Food Retrieval
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Solution Overview
Problem
Existing refrigerators face challenges in easy food retrieval due to shelf guards and limited vertical storage space, as food gets caught on protrusions and shelves are not easily adjustable in height.
Innovation Solution
A refrigerator design where shelf guards rotate to provide a flat surface for easy food removal and multiple shelves are adjustable in height using a lever mechanism, allowing the user to change the storage space without manual manipulation of each shelf guard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shelf guard with a protrusion is provided to prevent food from falling, then food storage safety is improved, but food retrieval becomes difficult because food gets caught on the protrusion
Solution Approach 1:
The shelf guard is designed to be rotatable about a rotation axis. When the refrigerator door opens, the shelf guard rotates automatically due to the interaction between the projection on the door and the moving part, changing from a protruding state to a retracted state. This dynamic adjustment allows the shelf guard to provide protection when needed and eliminate obstacles during food retrieval.
Solution Approach 2:
The shelf guard rotation mechanism is activated automatically by the door opening action itself. The projection on the door interacts with the moving part connected to the shelf guard, causing the shelf guard to rotate without requiring separate manual manipulation by the user. The door's own movement serves to adjust the shelf guard position.
2Area of stationary object
If multiple shelves are arranged in a vertical direction with limited height, then door space utilization is improved, but storage of food with high vertical height becomes difficult
Solution Approach 1:
The shelf is designed with adjustable height capability through a lever mechanism. The lever connects to a rack and pinion system that allows the shelf to move vertically along the door. This dynamic adjustment enables users to change shelf positions to accommodate different food storage needs, including tall items.
Solution Approach 2:
The shelf height parameter can be changed by the user through lever manipulation. The rack and pinion mechanism converts the rotational motion of the lever into linear vertical movement of the shelf, allowing continuous or discrete adjustment of the shelf's vertical position to optimize storage space utilization.
3Ease of operation
If a shelf guard rotation mechanism is added to improve food retrieval, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The shelf guard rotation mechanism is integrated with the door structure itself. The projection is formed on the door, and the moving part is connected to both the door and the shelf guard. This merging of functions allows the door's natural movement to drive the shelf guard rotation, eliminating the need for separate actuators or complex control systems.
Solution Approach 2:
The door serves multiple functions: it provides the structural enclosure, contains the projection that acts as the actuating element for shelf guard rotation, and its opening/closing motion simultaneously performs both sealing and shelf guard adjustment functions. This multi-functionality reduces the need for additional dedicated components.
4Adaptability or versatility
If a lever mechanism is added to adjust shelf height, then adaptability is improved, but device complexity increases
Solution Approach 1:
The lever acts as an intermediary mechanism between the user's manual input and the shelf position adjustment. The lever connects to the rack and pinion system, which serves as another intermediary that converts rotational lever motion into linear shelf movement. This intermediary mechanism provides mechanical advantage and precise control.
Solution Approach 2:
The complex electronic or motorized shelf adjustment systems are replaced with a simple mechanical lever and rack-pinion mechanism. This purely mechanical system provides reliable, maintenance-free operation while achieving the same height adjustment functionality with fewer components and lower complexity.
Data Source
AI summary
A refrigerator may include a shelf provided on a door and a shelf guard provided to be movable in front of the shelf so that a user can easily take out food.