Guide rail for a pull-out guide for a drawer
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Solution Overview
Problem
Existing drawer pull-out guides require increased installation space due to the thickness of guide rails, limiting their compactness and stability, especially when using large material thicknesses.
Innovation Solution
Incorporating a tapered material recess in the angled area between guide rail webs, allowing for stronger angling and reduced material thickness, which enlarges the planar running surfaces for rolling elements, thereby improving stability and load capacity without increasing the guide rail's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large material thicknesses are used in guide rails, then stability and load capacity are improved, but installation space increases due to rounded angled areas
Solution Approach 1:
The recess is introduced locally at the angled area where compressive stresses occur during bending, rather than uniformly throughout the entire guide rail. This localized material removal allows the angled area to be sharpened without compromising the overall structural integrity and load-bearing capacity of the guide rail.
Solution Approach 2:
The solution transitions from a rounded angled area (curved geometry) to a sharpened angled area with recess (flat geometry with reduced dimension in the angled region). This dimensional change allows the guide rail to achieve a more compact form factor while maintaining sufficient strength through the strategically placed recess that prevents compression failure.
2Volume of moving object
If guide rails are made more compact with sharper angled areas, then installation space is reduced, but compressive stresses increase during bending
Solution Approach 1:
The recess, which initially appears to weaken the structure by removing material, actually serves to prevent compression failure. By creating a localized reduction in material thickness at the angled area, the recess allows the structure to accommodate sharper angles without developing excessive compressive stresses that would lead to failure during bending operations.
3Strength
If rolling elements are widened to distribute forces, then load capacity is improved, but the guide rail size must increase
Solution Approach 1:
The guide rail is segmented into regions of different material thicknesses - the recess creates a localized thin section at the angled area while maintaining adequate thickness in other regions. This segmentation allows the guide rail to accommodate wider rolling elements for improved load distribution without increasing the overall size of the guide rail, as the recess is confined to a specific localized area.
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a pull-out guide (4) for a drawer, comprising at least one guide rail (10), wherein said guide rail (10) comprises an elongate first strut (10a) and at least one elongate second strut (10b) forming an angle with the first strut (10a), wherein the first strut (10a) and the second strut (10b) are interconnected in the longitudinal direction (L) thereof by means of an angled region (23), said angled region (23) having at least one material tapering that extends along the angled region (23) and is formed by a recess (21).