Drawer arrangement
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Solution Overview
Problem
Existing drawer pull-out guides face issues with lateral stability and tilting moments when heavily loaded, requiring a large installation space and leading to uneven strain on rolling bodies, which can cause deformations.
Innovation Solution
The transverse limb of the central rail protrudes partially below the support portion for the drawer bottom, reducing the lateral operating distance and improving vertical stiffness by aligning the weight force closer to a vertical direction, with a side limb having a greater length than the transverse limb and an L-shaped configuration for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the central rail has an asymmetric extended transverse limb protruding from the main limb at a right angle to increase lateral stability, then lateral stability is improved, but a large installation space is required and considerable lateral tilting moment still acts on the drawer pull-out guide when heavily loaded
Solution Approach 1:
The central rail employs an asymmetric L-shaped configuration where the transverse limb protrudes partially below the support portion rather than extending horizontally. This asymmetric design reduces the lateral operating distance while maintaining structural stability, resolving the contradiction between lateral stability and installation space requirements
Solution Approach 2:
The transverse limb is repositioned from a horizontal extension to a vertical projection below the support portion. This dimensional change allows the weight force to be introduced closer to the vertical direction, reducing lateral tilting moments while minimizing the horizontal space required for installation
2Stability of the object's composition
If the transverse limb is positioned to reduce lateral operating distance and improve vertical stiffness, then tilting moment is reduced and vertical stiffness is improved, but the drawer bottom cannot be positioned optimally for storage
Solution Approach 1:
The support portion is specifically designed to accommodate the repositioned transverse limb while maintaining its load-bearing function. The local structural quality at the support portion allows the drawer bottom to be positioned closer to the pull-out guide, optimizing both vertical stiffness and storage capacity
3Ease of manufacture
If the drawer pull-out guide is designed with conventional configuration, then manufacturing is simpler, but rolling bodies are subjected to uneven strain leading to deformations
Solution Approach 1:
The geometric parameters of the central rail are optimized by having the side limb extend greater length than the transverse limb, with a height-to-width ratio between 1:0.4 and 1:1. This parameter change redistributes the load more evenly across the rolling bodies, improving reliability while remaining manufacturable
Data Source
AI summary
A drawer arrangement includes a drawer side wall to be connected to a drawer rail of a drawer pull-out guide, the drawer side wall having a support portion for supporting a drawer bottom, and a drawer pull-out guide having a carcass rail to be fixed to a furniture carcass, a drawer rail to be connected to the drawer side wall, and a central rail displaceable between the carcass rail and the drawer rail. The central rail has a side limb and a transverse limb connected therewith. In the mounted position, the side limb of the central rail, at least over a region, is arranged laterally besides the support portion for the drawer bottom. The transverse limb of the central rail and the carcass rail in the mounted position protrude at least partially below the support portion for the drawer bottom.