Mechanism for an office chair
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Solution Overview
Problem
Existing office chair mechanisms fail to provide adjustable tilting resistance that adapts to different user weights, often requiring complex structural solutions that increase manufacturing and assembly costs.
Innovation Solution
A mechanism that uses a spring arrangement acting on both the seat and backrest supports to adjust tilting resistance, allowing the seat to tilt forward against the spring force, with the spring force presetting influencing the tilting resistance and adapting to user weight, thereby enhancing dynamic sitting functionality without additional spring elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate spring arrangement is added to adjust seat tilting resistance, then the adaptability to different user weights is improved, but the device complexity and manufacturing costs increase
Solution Approach 1:
The spring arrangement is designed to serve dual functions: providing pivoting resistance for the backrest and providing tilting resistance for the seat. By connecting the spring arrangement between the backrest support and seat support, a single component performs what would traditionally require separate mechanisms, thereby reducing device complexity while maintaining adaptability to different user weights through adjustable spring force presetting.
2Adaptability or versatility
If additional spring elements are added to the mechanism, then the tilting resistance adjustment capability is improved, but the manufacturing and assembly costs increase
Solution Approach 1:
The spring arrangement is integrated into the existing backrest mechanism, serving both as a backrest pivoting resistance mechanism and a seat tilting resistance mechanism. This eliminates the need for additional spring elements while providing full tilting resistance adjustment capability through the adjustable spring force presetting feature.
Solution Approach 2:
The invention merges the backrest pivoting mechanism and seat tilting mechanism into a single integrated system. The spring arrangement, pivot axes, and structural connections are combined so that one mechanism performs multiple functions, reducing the total number of components and simplifying manufacturing and assembly processes.
3Adaptability or versatility
If the spring force presetting is adjusted to adapt to different user weights, then the adaptability is improved, but the device complexity increases due to adjustment mechanisms
Solution Approach 1:
The spring force presetting is adjusted by changing physical parameters of the spring arrangement, such as the position of attachment points or the pre-compression of the spring. These parameter changes allow the same spring arrangement to adapt to different user weights without requiring complex adjustment mechanisms, maintaining simplicity while providing adaptability.
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 provides adjustable tilting resistance that suits various user weights, offering a dynamic sitting experience with reduced manufacturing and assembly costs by utilizing the main spring for both backrest pivoting and seat tilting, ensuring the tilting resistance feels consistent across all users.
Implementation Method 1
a spring arrangement (22) acting between the backrest support (5) and the seat support (4), whose spring force determines the pivoting resistance of the backrest support (5) and, together with the user's weight, the strength of the seat support (4) tilting
Data Source
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AI summary
The invention relates to a mechanism (1) for an office chair with a base support (3) that can be placed on a chair column, with a seat support (4) that is arranged on the base support (3) and can be moved relative to the base support (3), and with a seat support that is connected to the seat support (4) coupled backrest support (5), wherein a pivoting of the backrest causes a movement of the seat support (4) relative to the base support (3). An alternative solution for adjusting the tilting resistance of the seat support of an office chair is specified, in which the tilting resistance of the seat support (4) is influenced by the pivoting resistance of the backrest support (5).