Pull-out guide in the form of a full-extension mechanism for a pull-out part of a piece of furniture
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Solution Overview
Problem
Existing pull-out guides for furniture extensions face challenges in torsional rigidity, leading to reduced load-bearing capacity and increased stress on components like deflection rollers.
Innovation Solution
The free longitudinal edges of the running surfaces on the C-shaped center rail are welded to the profile outside the running surfaces, significantly increasing torsional rigidity and reinforcing the structure, while also integrating a cable control system that reduces material consumption and peripheral speeds of deflection rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the center rail uses a C-shaped profile with folded side bars to form running surfaces, then the pull-out guide achieves full extension capability, but the torsional rigidity of the profile is insufficient leading to reduced load-bearing capacity
Solution Approach 1:
The center rail profile is divided into distinct functional zones: running surfaces for roller contact and free longitudinal edges for welding. This segmentation allows the running surfaces to maintain their smooth, load-bearing geometry while the free edges provide structural reinforcement through welding to adjacent profiles, thereby increasing torsional rigidity without compromising extension capability
Solution Approach 2:
The solution combines the C-shaped formed profile with welded connections to create a composite structural system. The formed profile provides the necessary geometry for full extension, while the welded joints between adjacent profiles create a rigid truss-like structure that significantly enhances torsional rigidity and load-bearing capacity
2Strength
If the free longitudinal edges of running surfaces are welded to the profile, then the torsional rigidity is significantly increased, but the manufacturing complexity increases due to additional welding operations
Solution Approach 1:
Welding is applied locally only at the free longitudinal edges of the running surfaces where structural reinforcement is most needed, rather than throughout the entire profile. This localized approach provides maximum torsional rigidity improvement with minimum additional manufacturing complexity, as welding is confined to specific zones that do not interfere with the running surfaces' primary function
Solution Approach 2:
The C-shaped profile with folded side bars is pre-formed through shaping processes before the welding operation. This preliminary forming creates the necessary running surfaces geometry, and the free longitudinal edges are left exposed and positioned optimally for subsequent welding operations, streamlining the manufacturing sequence
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 solution enhances the load-bearing capacity and torsional rigidity of the pull-out guide, extends the service life of components, and offers a cost-effective production method with reduced stress on parts, particularly the deflection rollers.
Implementation Method 1
The running rail 3 is guided by means of rolling elements held in rolling element cages
Implementation Method 2
the respective free longitudinal edges of one of the running surfaces formed are firmly welded to the rest of the profile outside of the running surfaces
Data Source
AI summary
Pull-out guide (1) in the form of a full-extension mechanism for a pull-out part of a piece of furniture, comprising a guide rail (2) which can be fastened on the basic structure of a piece of furniture, also comprising a running rail (3) which can be coupled to a pull-out part, and further comprising a central rail (4) which is arranged between the guide rail (2) and the running rail (3), increases the pull-out length, is guided in relation to the guide rail (2) and the running rail (3) by means of rolling bodies retained in rolling-body cages (5) and consists of a shaped, cross-sectionally approximately C-form profile of which the sidepieces (4a) are folded together in roof form in order to form running surfaces (4b) for the rolling bodies, wherein the respectively free longitudinal edges (4c) of one of the running surfaces (4b) formed are otherwise fixed to the profile outside the running surfaces (4b).