Drawer Pull-Out Rail Geometry for Smooth Running Under Load
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Solution Overview
Problem
Existing pull-out guide systems for drawers experience deformation of plastic rollers under high load, leading to adverse impacts on running behavior due to uneven stress distribution, which affects smooth operation and stability.
Innovation Solution
A pull-out guide system where the first rolling element has a smaller diameter than the second rolling elements, with a designed elevation on the drawer rail that shifts load onto the first rolling element when closed and relieves it when opening, allowing the second rolling elements to handle the load for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plastic rollers are used as rolling elements to ensure smooth running, then ease of operation is improved, but under high load the rollers deform and running behavior deteriorates
Solution Approach 1:
The carriage is divided into multiple rolling elements (first rolling element and second rolling elements) with different functions. The first rolling element has a smaller diameter and is positioned to bear load when the drawer is closed, while the second rolling elements have larger diameters and bear load when the drawer is open, segmenting the load-bearing function across different components based on operational state.
Solution Approach 2:
Different rolling elements are assigned different local qualities - the first rolling element has a smaller diameter optimized for closed-position load bearing, while the second rolling elements have larger diameters optimized for open-position load bearing and smooth running. The drawer rail also has a localized elevation at the front end region that specifically engages with the first rolling element to apply vertical load.
2Manufacturing precision
If all rolling elements have the same diameter to maintain uniform structure, then manufacturing precision is improved, but load distribution becomes uneven causing deformation
Solution Approach 1:
The rolling elements are deliberately made asymmetric in diameter - the first rolling element has a smaller diameter than the second rolling elements. This asymmetric design creates different functional characteristics: the smaller first rolling element concentrates load when engaged by the elevation during closed position, while the larger second rolling elements provide smoother running during open position, optimizing load distribution according to operational requirements.
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 prevents deformation of the first rolling element by limiting its load-bearing role to support when closed and ensuring smooth operation by exclusively using the second rolling elements when opening, maintaining stability and preventing jerky movements.
Implementation Method 1
the load of the drawer is transmitted by a first and at least one second rolling element
Data Source
AI summary
Pull-out guide system for drawers, having a basic-structure rail, a drawer rail and, if appropriate, having a center rail arranged between these two rails. The load of the drawer is transmitted by way of a first rolling-contact body and at least one second rolling-contact body, and the first rolling-contact body has a smaller diameter than the at least one second rolling-contact body. The drawer rail is designed such that, when the drawer is in the closed state, the first rolling-contact body is subjected to loading by the drawer rail and, when the drawer is opened, the first rolling-contact body is relieved of the loading of the drawer rail.