Drawer Rail Bracket Hook Design to Prevent Rail Separation and Noise
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Solution Overview
Problem
Existing drawer rail systems in home appliances, such as dishwashers, face issues with rail separation, difficulty in engaging/disengaging the basket, and noise due to gaps between rails, especially when handling heavy loads and long movement distances.
Innovation Solution
A drawer rail system with a first rail mounted to the storage chamber, a second rail coupled to the item accommodation unit, and a third rail in between, featuring stoppers and retainers to prevent rail separation and noise, with symmetrical and perforated designs for easy assembly and disassembly, and a rail bracket for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gap between rails is increased to allow relative movement, then the ease of operation is improved, but the reliability deteriorates as rails may separate from one another
Solution Approach 1:
A retainer is introduced as an intermediary component between the first and second rails. The retainer includes retaining portions that extend into the gaps between rails, preventing lateral separation while still allowing the necessary relative sliding movement. This mediator structure resolves the contradiction by maintaining both operational ease and structural reliability.
2Productivity
If the length from stopper to distal end of rail is increased to allow longer movement distance, then the productivity is improved, but the reliability deteriorates as the gap between rails increases beyond allowable range
Solution Approach 1:
The retainer acts as a mediator that spans the increased distance between rails. By positioning retaining portions at strategic locations along the retainer's length, the structure prevents rail separation even when the overall movement distance is extended, thus maintaining reliability while enabling improved productivity.
Solution Approach 2:
The solution moves from considering only the longitudinal dimension (movement distance) to incorporating the lateral dimension (gap control). The retainer extends in the lateral direction with retaining portions that engage both rails, creating a three-dimensional constraint system that allows long movement while preventing separation.
3Ease of operation
If the position of the second rail is made non-fixed to allow easy mounting and separation, then the ease of operation is improved, but the stability of the object's composition deteriorates
Solution Approach 1:
The system transitions from a static fixed connection to a dynamic conditional connection. The retainer allows the second rail to be easily mounted and separated when needed (dynamic state), while maintaining stable positioning during operation through the retaining portions that prevent unintended movement (stable state).
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 system ensures reliable and noise-free operation by preventing rail separation, facilitating easy engagement and disengagement, and providing secure support for heavy loads over long distances, reducing manufacturing costs through symmetrical components.
Implementation Method 1
The inner rail slides relative to the outer rails using ball bearings, which are provided in a retainer.
Data Source
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Figure 6
AI summary
A home appliance including a drawer rail (100) is disclosed. The home appliance includes a drawer rail (100) configured to withdraw an item accommodation unit provided in a storage chamber and a rail bracket (20) configured to mount the drawer rail (100) to the storage chamber. The rail bracket (20) includes a body (30) configured to be mounted to the storage chamber, and bracket hooks (42) provided at openings formed in a front portion and a rear portion of the body (30). The drawer rail includes rail holes (211, 212) into which the bracket (42) hooks are respectively inserted.