Articulated Lumbar Support for Asymmetrical Chair Backrests
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Solution Overview
Problem
Existing lumbar supports for chairs with pivotable backrest carriers are limited in their ability to provide individual, asymmetrical adjustments and are not compatible with chairs having independently pivoting backrest carriers, leading to reduced sitting comfort.
Innovation Solution
A lumbar support system with individually adjustable spring elements mounted on carriers that can pivot independently, allowing for asymmetrical support adjustments and articulation with pivotable backrest carriers, using leaf springs and lever mechanisms for customizable resistance and height adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lumbar support is arranged centrally on a rigid backrest frame, then the lumbar support position can be adjusted, but it cannot adapt to independent pivoting of backrest carriers
Solution Approach 1:
The lumbar support is divided into multiple support regions (first and second support regions) that are independently adjustable, allowing each region to adapt to different positions of the independently pivotable backrest carriers
Solution Approach 2:
The lumbar support uses spring elements with adjustable spring actions that can dynamically adapt to the changing positions of the backrest carriers during independent pivoting, maintaining continuous support contact
2Ease of operation
If lumbar support depth is adjusted at right angles to the backrest, then support position can be changed, but user convenience is reduced
Solution Approach 1:
The spring action parameter of each spring element is individually adjustable, allowing users to modify the support force and position by changing the spring action parameter rather than moving the entire lumbar support depth-wise
3Adaptability or versatility
If support regions are arranged on leaf spring halves for independent force adjustment, then spring force can be adjusted, but compatibility with rigid backrest frames is limited
Solution Approach 1:
The lumbar support design with spring elements and articulated connection to backrest carriers creates a universal solution that works with both rigid backrest frames and pivotable backrest carriers, maintaining reliable support function across different chair configurations
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
Enhances user comfort by allowing individualized support for the lumbar region, adapting to the user's needs and the chair's tilting position, providing a comfortable sitting experience through adjustable spring force and position alignment.
Implementation Method 1
support regions (10a, 10b) which are each mounted on a spring element (2), wherein the spring action of each spring element (2) is individually adjustable
Implementation Method 2
the spring element comprises a leaf spring
Data Source
AI summary
The invention relates to a lumbar support (1) for a chair with a backrest comprising backrest carriers (7) which are pivotable independently of each other, wherein the lumbar support comprises support regions (10a, 10b) which are each mounted on a spring element (2). The spring action of each spring element (2) is individually adjustable. In this arrangement, the spring elements (2) are arranged on a carrier (5), which can be articulated to the backrest carriers (7) of the backrest of the chair, which are pivotable independently of each other. The invention further relates to a chair with a backrest, which is formed from backrest carriers (7) which are pivotable independently of each other and which also comprises the aforementioned lumbar support (1). In this case, the lumbar support (1) is articulated to the backrest carriers (7) which are pivotable independently of each other.