Telescopic Lifting Column With Dual-Plane Slider Prestress
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Solution Overview
Problem
Height adjustable tables experience significant vibrations due to horizontal forces, which affect stability and require efficient damping solutions to meet vibration standards while maintaining design aesthetics and manufacturing feasibility.
Innovation Solution
A lifting column design with sliders prestressed in two distinct planes, where the first plane has a larger prestressing and the second plane has a smaller prestressing, applied between the telescopic members to reduce vibrations, achieved through embossing or adjustable thickness, optimizing friction and manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a larger overlapping of telescopic members is used to improve stability, then the lifting column stability improves, but the height adjustment range is reduced
Solution Approach 1:
The lifting column is divided into multiple telescopic members (first member, second member, third member) that can overlap partially while maintaining overall length adjustment capability. This segmentation allows stability through overlapping sections while preserving height adjustment range through the telescopic mechanism.
2Manufacturing precision
If sliders with adjustable thickness are used to compensate manufacturing tolerances, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The slider thickness is varied as a parameter to compensate for manufacturing tolerances in the groove dimensions. By adjusting the slider thickness parameter, the system accommodates tolerance variations without requiring complex adjustment mechanisms, thus maintaining manufacturing precision while controlling device complexity.
3Object-affected harmful factors
If prestressing is applied to sliders to reduce vibrations, then the vibration damping improves, but the friction between sliders and members increases
Solution Approach 1:
Prestressing is applied locally to specific sliders rather than uniformly to all sliders. This localized prestressing provides vibration damping where needed while minimizing the overall friction increase in the system, resolving the contradiction between vibration reduction and friction force.
4Shape
If the lifting column is designed to be slim for aesthetic purposes, then the design quality improves, but the structural stability deteriorates
Solution Approach 1:
Multiple telescopic members are nested within each other to create a slim overall profile while maintaining structural stability through the overlapping sections. The nested arrangement allows the column to appear slim externally while having internal overlapping structures that provide the necessary stability.
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 approach significantly reduces vibrations in lifting columns, improving stability and meeting height adjustment standards with reduced manufacturing costs and tooling costs, while maintaining a slim and elastic design.
Implementation Method 1
These sliders also serve the purpose of keeping the friction between the individual members as low as possible. The amount of the friction has a direct influence on the force and energy needed to displace the guide.
Implementation Method 2
a first set of sliders is arranged on an internal side of the first member at the end of the first member into which the second member extends and may be displaced out of, and where a second and third set of sliders are arranged on the outside of the second member
Data Source
AI summary
A lifting column preferably, for height adjustable tables, includes a guide (5) and a drive unit (9), the guide (5) including at least a first member (5a) and a second member (5b), the members (5a, 5b, 5c) being arranged mutually telescopically relative to each other. At the end of the first member (5a) from which the second member (5b) can be displaced sliders are arranged on an internal side thereof. At the end of the second member (5b) extending into the first member (5a) sliders are likewise arranged on the outside thereof. In a first plane the sliders have a first, a large, prestressing between the first member (5a) and the second member (5b), while the sliders in the second plane have a second, a small, prestressing between the first (5a) and second member (5b). Thus, a good dampening of vibrations of the table is achieved in case of exposure to horizontal forces.