Pull-Out Guide With Dual-Material Rollers for Quiet High Loads
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Solution Overview
Problem
C-profile ball pull-out guides in kitchen furniture exhibit high rolling noise due to their design, which affects their load-bearing capacity and operational quietness.
Innovation Solution
A pull-out guide with two types of rolling elements, where softer, larger rolling elements made of materials like thermoplastic polyamide or metallic materials (aluminum, zinc, tin) assume the load-bearing function during normal operation, reducing noise, while harder steel rolling elements take over at high loads, and the guide rails are designed with minimal pre-tension to enhance smooth operation and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If harder steel rolling elements are used, then load-bearing capacity is improved, but rolling noise increases
Solution Approach 1:
The patent applies local quality by using different material properties for rolling elements at different positions. Softer rolling elements (plastic or aluminum) are placed at positions where they contact the guide rail during normal operation to reduce noise, while harder steel rolling elements are positioned to engage only under overload conditions to provide load-bearing capacity and protection.
Solution Approach 2:
The patent employs composite materials by combining rolling elements made of different materials (plastic, aluminum, steel) within the same guide system. Each material serves a specific function: plastic/aluminum for quiet normal operation, steel for high-load protection, creating a composite rolling element system that achieves both low noise and high load-bearing capacity.
2Object-generated harmful factors
If softer rolling elements are used, then rolling noise is reduced, but load-bearing capacity decreases
Solution Approach 1:
The patent implements preliminary action by pre-positioning harder steel rolling elements within the assembly that remain dormant during normal operation. These steel elements are arranged to automatically engage when overload conditions occur, providing pre-prepared load-bearing capacity without interfering with quiet normal operation by the softer elements.
Solution Approach 2:
The patent applies dynamics by creating a dynamic system where the active rolling element material changes based on load conditions. During normal operation, softer elements are active for quiet performance; under overload, harder steel elements become active, allowing the system to dynamically adapt its load-bearing characteristics to operational demands.
3Stability of the object's composition
If guide rails are mounted with pre-tension, then stability is improved, but rolling noise increases
Solution Approach 1:
The patent applies parameter changes by adjusting the pre-tension parameter of the guide rail mounting to a minimal level. This parameter optimization reduces the contact pressure between rolling elements and guide rails during assembly and normal operation, thereby minimizing rolling noise while maintaining sufficient mounting stability through the combined action of multiple rolling elements.
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 solution significantly reduces rolling noise during normal operation while maintaining high load-bearing capacity, preventing damage from excessive loads and ensuring smooth movement with minimal assembly noise.
Implementation Method 1
the rolling noise of the drawer guide in the unloaded state and in normal operation of the drawer guide is determined by the softer rolling elements of the first type
Implementation Method 2
softer rolling elements made of materials like thermoplastic polyamide or metallic materials (aluminum, zinc, tin) assume the load-bearing function during normal operation, reducing noise
Data Source
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AI summary
In order to provide a pull-out guide comprising at least a first guide rail and a second guide rail which is guided in a displaceable manner by means of a roller body arrangement (110) on the first guide rail (106), wherein the roller body arrangement comprises at least one ball cage (132) having roller bodies (142), which pull-out guide has both a high load-bearing capacity and exhibits a low level of rolling noise and preferably a low level of rolling resistance, the invention proposes that the roller body arrangement comprises at least two different types of roller bodies, wherein one roller body (148) of a first type comprises a first material having a first hardness, and a roller body (148) of a second type comprises a second material having a second hardness, wherein the first hardness of the first material is lower than the second hardness of the second material, and wherein the roller body of the first type is larger than the roller body of the second type.