Lumbar support chair having structure adjustable according to change of posture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
General chairs fail to effectively support a sitter's back and waist when their posture changes, leading to discomfort and improper body alignment, as existing solutions either lack sufficient support or are prone to unnecessary shape changes under force application.
Innovation Solution
A lumbar support chair with a bowl-shaped seat and a hingedly coupled back support that can adjust to match the sitter's posture, featuring a cut portion for independent thigh support and a stopper bar to prevent excessive tilting, allowing for adaptive shape and position changes to ensure comfortable seating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the back support is made of rigid plastic material to provide firm support, then the support strength is improved, but the chair cannot adapt to posture changes causing discomfort
Solution Approach 1:
The back support is divided into multiple independent support rods (upper back support rod, lower back support rod, lumbar support rod) that can move and adjust independently. This segmentation allows each rod to respond to local pressure changes from posture variations while maintaining overall structural support, resolving the contradiction between firm support and adaptability.
Solution Approach 2:
The support rods are designed with dynamic characteristics, allowing them to move, rotate, and adjust their positions based on applied forces from the sitter's body. The rods can pivot at connection points and change orientation to match posture changes, transforming the rigid structure into a dynamic system that adapts while providing continuous support.
2Stability of the object's composition
If the seat and back support are made of rigid plastic material to maintain structural stability, then the structural stability is improved, but the chair transforms in shape under local force causing discomfort
Solution Approach 1:
The back support structure is segmented into multiple independent rods connected through pivot joints, allowing localized deformation and shape adjustment under applied forces while the overall structural framework remains stable. Each segment can move independently to accommodate posture changes without compromising the entire structure's stability.
Solution Approach 2:
The chair utilizes changes in geometric parameters (angles, positions, orientations) of the support rods in response to applied forces. The rods can change their angular positions and spatial orientations adaptively while maintaining structural integrity, allowing the chair to conform to different body shapes and postures without losing structural stability.
3Adaptability or versatility
If the orthopedic device is made of thin synthetic resin to allow elastic transformation, then the adaptability to posture changes is improved, but the support firmness is reduced
Solution Approach 1:
The patent employs a cover layer made of flexible material that envelops the rigid support rods. This flexible cover allows elastic deformation and transformation in response to posture changes, while the underlying rigid rods provide firm structural support. The combination resolves the contradiction by separating the adaptive function (flexible cover) from the support function (rigid rods).
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 chair provides effective support for the sitter's back and waist across various postures, ensuring comfort and posture correction, while being versatile for use on different seating types and facilitating easy storage and transportation due to its foldable design.
Implementation Method 1
a hinge pin P is coupled to a first uneven part 14 and a second uneven part 22 which are formed as a pair, so as to allow the back support 20 to be rotated
Implementation Method 2
the seat 10 is made of synthetic resin which is rigid but has elasticity
Data Source
AI summary
The present invention relates to a chair and, more particularly, to a lumbar support chair of which the shape and position are adjusted according to a change of posture of a sitter to support a user's lumbar, thereby providing a comfortable feeling and a posture correction effect.