Household appliance
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Solution Overview
Problem
Household laundry treatment machines face challenges in providing a convenient and easy-to-handle drawer mechanism due to high friction between the drawer and its housing, which increases the effort required for operation.
Innovation Solution
The introduction of recesses or microstructures on the contact surfaces between the sliding element and the guiding element reduces the contact surface area, thereby decreasing friction and improving the sliding mechanism, allowing for easier and more comfortable drawer operation without the need for additional lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drawer is constrained at the edges with lateral edges sliding on slots, then the drawer structure is simple and easy to manufacture, but the contact surface increases and friction worsens, making the drawer difficult to handle
Solution Approach 1:
The invention applies a roughness increase only to specific contact surfaces (guiding elements and/or sliding elements) rather than the entire drawer structure. This localized modification reduces friction where it matters most while maintaining the overall simple drawer design and manufacturing process.
Solution Approach 2:
The invention changes the surface parameter (roughness) of the contact surfaces to optimize friction characteristics. By increasing roughness in specific areas, the drawer achieves easier handling without requiring structural redesign or additional lubrication systems.
2Reliability
If the contact surface between drawer and housing is large, then the drawer is stable and maintains precise movement, but friction increases and the drawer becomes difficult to operate
Solution Approach 1:
The invention creates different surface qualities in different locations: roughness is increased only at the contact surfaces between guiding and sliding elements, while other parts of the drawer maintain their original smooth surfaces. This localized approach reduces friction without compromising overall structural stability.
Solution Approach 2:
The invention converts the typically harmful effect of friction into a beneficial one by strategically increasing roughness. The increased roughness at contact surfaces creates better mechanical interlocking and reduces sliding friction, transforming what is usually a resistive force into one that facilitates smooth drawer operation.
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
This solution enhances the user experience by reducing the force needed to open or close the drawer, ensuring smooth and predictable sliding while maintaining the necessary contact surface area for precise movement, thus improving the overall handling of the appliance.
Implementation Method 1
the guiding element and/or the sliding element comprises at least in a portion of said contact surface a roughness increased by recesses which reduces the respective contact surface
Data Source
AI summary
A household appliance having a retractable drawer arranged in a drawer housing. The drawer has at least one sliding element slideably arranged on at least one guiding element provided on the drawer housing such that the sliding element and the guiding element provide respective contact surfaces for each other, whereby the guiding element and/or the sliding element has, at least in an area, recesses that reduce an area of the respective contact surface.