Refrigerator Door Hinge Geometry for Open-Angle Holding
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Solution Overview
Problem
Existing door hinge units in refrigerators lack a mechanism to hold the door open at a predetermined position, leading to potential damage from external impacts and increased friction noise, making it difficult to control the door's movement and maintain air tightness.
Innovation Solution
A door hinge unit with a female member and male member design featuring grooves and ridges with specific angular slopes and peak portions, allowing for controlled door movement, minimizing friction, and preventing the door from opening beyond 180 degrees, while ensuring easy assembly and maintaining air tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the door is opened without limit, then the door can be fully opened for taking out goods, but the door hits external objects causing damage and the hinge shaft breaks
Solution Approach 1:
The hinge unit incorporates a door holding mechanism that actively prevents the door from opening beyond a predetermined angle (typically 180 degrees). This preliminary restraint avoids the harmful impact that would occur if the door were allowed to open without limit, thereby protecting both the door and hinge shaft from damage while still permitting full access for goods retrieval.
2Strength
If the horizontal portion area is large, then the ridge and groove engagement is strong, but the friction surface becomes large causing noise and difficult movement control
Solution Approach 1:
The hinge design features a ridge with a localized horizontal portion that provides sufficient engagement strength precisely where needed for secure connection. The vertical portions are minimized to reduce the overall friction surface area. This selective distribution of geometric features ensures strong engagement at critical points while minimizing friction-induced noise and movement resistance throughout the hinge's rotation.
3Ease of operation
If the door is held open at a certain position, then convenience for taking out goods is improved, but the hinge structure becomes more complex
Solution Approach 1:
The door holding function is achieved through the inherent geometry of the ridge and groove structures themselves, without requiring separate holding mechanisms or additional components. The ridge's specific configuration with horizontal and vertical portions creates natural engagement points that automatically hold the door at predetermined positions during opening and closing, providing convenience while maintaining structural simplicity.
Data Source
AI summary
A door hinge unit in a refrigerator which pivots a door on a refrigerator body, and holds the door to maintain an opened state or a maximum opened state at a predetermined position for preventing the door from hitting an external object and a hinge shaft from breaking, and minimizes a friction surface between a male member and a female member of the hinge for making movement of the hinge smooth and preventing the hinge from causing noise.