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Solution Overview
Problem
Differential pull-out guides experience misalignment and jerking due to uneven loading of rollers caused by deviations in guide rail positions, leading to rattling noises and trembling, especially with high static friction materials like plastics.
Innovation Solution
A pull-out guide design featuring a load-transmitting differential roller with first and second partial rollers of substantially the same diameter, rotating in opposite directions, which roll between the same opposite tracks of the guide rails, reducing the difference in rolling circumference and minimizing jerking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wide roller is used in differential pull-out guides, then the structure is simple, but uneven loading causes misalignment and jerking due to deformation
Solution Approach 1:
The single wide roller is divided into two separate narrow rollers (first and second rollers) that are arranged side-by-side. Each roller independently contacts its respective raceway, preventing the misalignment and jerking problems caused by uneven loading and deformation of a single wide roller. The rollers are mounted on a common axis and can rotate in opposite directions.
2Force
If rollers are made wider to increase load capacity, then load capacity improves, but rolling circumference difference increases causing more jerking
Solution Approach 1:
Instead of using one wide roller, the solution segments the rolling function into multiple narrow rollers. This maintains adequate load capacity through distribution while minimizing the rolling circumference difference at each roller's contact points, thereby reducing jerking and improving running smoothness.
3Manufacturing precision
If raceways are positioned exactly horizontally and parallel, then theoretical loading is even, but manufacturing tolerances and deformation cause uneven loading
Solution Approach 1:
By using multiple narrow rollers instead of a single wide roller, the system becomes less sensitive to raceway positioning deviations. Each narrow roller contacts a smaller portion of the raceway, reducing the impact of manufacturing tolerances and rail deformation on loading uniformity.
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 design significantly reduces roller misalignment and jerking, enhancing running smoothness and stability by ensuring even loading and synchronized operation of the rails.
Implementation Method 1
at least a first and a second partial roller (16a, 16b) which have at least substantially the same diameter and whose running surfaces (27, 28) are next to one another and which can be rotated in opposite directions, the partial rollers rolling between the same, opposite raceways of two of the guide rails (3, 5)
Data Source
Figure 1~2
Figure 3~10
Figure 4~6
AI summary
A pull-out guide for pulling out a pull-out furniture part (1, 101) from a furniture body (2, 102) comprises at least two guide rails (3, 4, 5, 103, 104, 105) and rollers (14, 15, 16, 17, 21, 22, 114, 115, 116, 121) for the displaceable mounting of the guide rails, wherein at least one of the rollers (16, 121) has at least a first and a second partial roller (16a, 16b; 121a, 121b) with at least essentially the same diameter, whose running surfaces (27, 28, 125, 126) lie side by side and which can be rotated in opposite directions. The partial rollers (16a, 16b; 121a, 121b) roll on the same track of one of the guide rails (3, 5; 104, 105) or between the same opposite tracks of two of the guide rails (3, 5; 104, 105).