Drawer Pull-Out Guide with Rack Support for Stable Over-Extension
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Solution Overview
Problem
Existing pull-out guides for drawers face challenges in maintaining synchronization and stability during over-extension, as the standard guide lengths are insufficient for increased drawer extension without increasing installation depth, leading to complex solutions involving strings and foldable elements.
Innovation Solution
Incorporating toothed rack end sections that project past the rolling body carriages and mesh with a toothed wheel, with supports on the body and drawer rails to prevent disengagement and deformation, ensuring synchronization and stability during over-extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the guide lengths are extended to increase drawer extension, then the drawer extension length is improved, but the installation depth increases
Solution Approach 1:
The invention introduces a differential center rail that moves independently between the body rail and drawer rail, adding a degree of freedom to the system. This allows the drawer rail to extend beyond the body rail (over-extension) while the center rail maintains synchronization through differential movement, achieving increased drawer extension without proportionally increasing installation depth
2Length of moving object
If over-extension is implemented to increase drawer extension, then the drawer extension length is improved, but the synchronization and stability deteriorate
Solution Approach 1:
The center rail acts as an intermediary element between the body rail and drawer rail. It carries a toothed wheel that meshes with toothed racks on both rails, mediating their movement and ensuring synchronization. During over-extension, the center rail's differential movement allows the drawer rail to extend beyond the body rail while maintaining coordinated motion through the toothed wheel-rack mechanism
3Length of moving object
If conventional over-extension mechanisms are used, then the drawer extension length is improved, but the device complexity increases
Solution Approach 1:
The invention merges the synchronization function and over-extension capability into a single integrated mechanism. The center rail with its toothed wheel combines both functions: it synchronizes the body rail and drawer rail through meshing with their toothed racks, while its ability to move differentially enables over-extension. This eliminates the need for separate synchronization mechanisms like strings or foldable support elements found in conventional solutions
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 solution allows for extended drawer operation with minimal elements, preventing toothed rack disengagement and maintaining synchronization, thereby enhancing stability and reducing the complexity of over-extension mechanisms.
Implementation Method 1
the center rail comprises a toothed wheel and the two rolling body carriages each comprise one toothed rack that meshes with the toothed wheel
Implementation Method 2
a center rail which runs differentially between these two and is guided in two rolling body carriages
Data Source
AI summary
A pull-out guide for drawers, including a body rail, a drawer rail, and a center rail which runs differentially between these two and is guided in two rolling body carriages. The center rail has a toothed wheel and the two rolling body carriages each have one toothed rack that meshes with the toothed wheel. When the pull-out guide is completely pulled out, the drawer rail is pulled out beyond the body rail. Each toothed rack includes a toothed rack end section which projects past the rolling body carriage and meshes with the toothed wheel when the pull-out guide is completely pulled out. The body rail and/or the drawer rail each have a support on which a side of the toothed rack end section facing away from the tooth profile is supported when the pull-out guide is completely pulled out.