Drawer Pull-Out Guide With Central Support Roller Layout
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Solution Overview
Problem
Existing drawer slides have a bulky design due to laterally mounted support rollers, which cause lateral tilting moments and potential twisting, and require a bend in the drawer rail for support, making them less compact and prone to jamming.
Innovation Solution
A central arrangement of the support roller between the side bar of the drawer rail and the furniture body rail, allowing for a more compact design with vertical load distribution and eliminating the need for a bend in the drawer rail, as the support roller interacts directly with the rail profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support roller is mounted laterally on the cabinet rail, then the drawer can be supported when closed, but the drawer slide becomes bulky and lateral tilting moments cause twisting
Solution Approach 1:
The support roller is relocated from a lateral mounting position on the cabinet rail to a central position on the middle rail, changing the spatial dimension of mounting. This dimensional shift allows the support function to be achieved without increasing the lateral width of the drawer slide, thereby resolving the contradiction between support reliability and compactness.
Solution Approach 2:
The middle rail serves as an intermediary component between the cabinet rail and drawer rail, providing a mounting location for the support roller. This intermediary structure enables central mounting of the support roller, which eliminates lateral tilting moments while maintaining the support function, thus resolving the twisting issue without requiring a bulky lateral mounting arrangement.
2Reliability
If the support roller is mounted laterally, then the drawer is supported, but lateral tilting moments are exerted on the carriages causing twisting
Solution Approach 1:
By relocating the support roller from lateral mounting on the cabinet rail to central mounting on the middle rail, the force application point changes from a lateral position to a central position. This dimensional change ensures that the support force acts vertically through the center of the drawer slide, eliminating lateral tilting moments and preventing twisting, thus maintaining structural stability while providing reliable support.
3Ease of manufacture
If the drawer rail has a bend for support, then the roller can be mounted, but the design becomes less compact
Solution Approach 1:
The requirement for a bend in the drawer rail is extracted and eliminated by providing the support function through the middle rail instead. The support roller is mounted on the middle rail and interacts with the straight drawer rail profile, removing the need for any bend in the drawer rail. This extraction of the bending requirement allows for a more compact, straight-rail design while maintaining manufacturing capability.
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 design enhances the compactness of the drawer slide, prevents twisting, and reduces jamming by ensuring a vertical load on the carriages, allowing for smoother operation and a visually appealing joint pattern between drawers.
Implementation Method 1
A central arrangement of the support roller in the guide system also results in a central load distribution, with the at least one support roller being able to be accommodated in a space-saving manner
Implementation Method 2
In contrast to the prior art mentioned, in which the support roller is mounted laterally, in the construction according to the invention no lateral tilting moment is exerted on the carriages located between the rails, so that the carriages are loaded largely vertically and no twisting of the drawer pull-out guide is caused
Implementation Method 3
a bearing (11) with at least one support roller (12), via which the drawer rail (8) is supported on the cabinet rail (5) in the closed state
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A drawer pull‑out guide (4), comprising: a body rail (5) which can be mounted on a furniture body (2) via a fastening section (6), a drawer rail (8) which can be fastened on a drawer (3) and is mounted movably relative to the body rail (5), wherein the drawer rail (8) has a side web (20) facing the fastening section (6), a central rail (7) which is mounted movably between the body rail (5) and the drawer rail (8), a bearing (11) with at least one supporting roller (12) via which the drawer rail (8) is supported in the closed state on the body rail (5), wherein the bearing (11) is arranged at a front end region of the central rail (7) or of the drawer rail (8) and is arranged so as to be non‑displaceable during operation in the longitudinal direction of the rail (7, 8) on which the bearing (11) is arranged, wherein the side web (20) of the drawer rail (8) is arranged between the supporting roller (12) and the fastening section (6) of the body rail (5).