Chair Lumbar Support Mechanism for 2-Axis Adjustment Stability
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Solution Overview
Problem
Existing chair designs often fail to provide adequate lumbar support adjustments, particularly in both vertical and horizontal directions, leading to discomfort and back pain for users due to poor fit and lack of customizable support.
Innovation Solution
A lumbar support adjustment mechanism that connects the lumbar support to the seatback, featuring a lumbar spring, mount, and interlocking mechanisms allowing vertical and horizontal adjustments, with a screw and nut assembly to secure the position, preventing slippage and ensuring proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lumbar support adjustment mechanism is added to provide both vertical and horizontal adjustments, then the adaptability and comfort for various user curvatures is improved, but the device complexity increases
Solution Approach 1:
The lumbar support adjustment mechanism is divided into separate functional components: a vertical adjustment mechanism with a first slider moving along a vertical guide, and a horizontal adjustment mechanism with a second slider moving along a horizontal guide. This segmentation allows independent adjustment in both directions while maintaining structural clarity and ease of manufacture.
Solution Approach 2:
The mechanism employs dynamic elements including springs that provide resilient force to maintain lumbar support contact, and movable sliders that enable continuous adjustment along vertical and horizontal guides. The spring-loaded design allows the support to adapt dynamically to user pressure while maintaining position.
2Reliability
If mechanical interlocks and screw-nut assemblies are used to secure the lumbar support position, then the reliability and stability are improved, but the ease of operation decreases
Solution Approach 1:
The mechanical interlocks on the flange automatically engage with corresponding features on the seatback frame when the lumbar support is positioned, providing self-locking functionality. The spring mechanism also self-adjusts to maintain contact pressure, reducing the need for manual intervention to maintain secure positioning.
3Adaptability or versatility
If a lumbar spring is incorporated into the adjustment mechanism, then the comfort and adaptability to user pressure is improved, but the device complexity increases
Solution Approach 1:
A spring is pre-installed within the lumbar support structure to provide resilient force before user contact. This spring cushioning element anticipates user pressure and automatically adjusts to maintain optimal contact force, preventing both excessive pressure and insufficient support.
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 mechanism allows for customizable lumbar support adjustments to accommodate various user curvatures, providing effective back support and reducing the risk of back pain by ensuring the lumbar support remains in place, enhancing user comfort and preventing unwanted movement.
Implementation Method 1
a lumbar spring, a lumbar mount comprising a vertical wall, a lumbar-end flange extending orthogonally forward from the vertical wall
Data Source
AI summary
The disclosure herein relates to lumbar support adjustment for a chair. More specifically, the disclosure related to a lumbar support adjustment mechanism that moves forward and aft relative to the user.