Twisting Backrest Frame Structure for Reclining Chair Support
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Solution Overview
Problem
Existing chair designs face challenges in conforming to changes in user posture, particularly when looking back, due to limited deformation of the backrest, which restricts the chair's ability to support the user's back and accommodate reclining motions effectively.
Innovation Solution
The chair incorporates a backrest with flexible upholstering material and vertically mounted frame sections that allow twisting deformation, enabling the backrest to incline and conform to the user's shape, supported by a rear supporting member that transmits loads to the leg body, allowing for stable support and reclining motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the back member is made thinner to enable deformation, then the deformability is improved, but the strength is reduced making it difficult to reliably support the user
Solution Approach 1:
The backrest is divided into multiple independent vertical frame sections (first, second, third, and fourth vertical frame sections) that can deform independently. This segmentation allows each section to contribute to overall deformability while maintaining structural strength through the distributed framework, resolving the contradiction between making the backrest thin for deformability versus maintaining strength for support.
2Reliability
If the back frame is firmly configured to receive the user's back, then the support reliability is improved, but the deformability is reduced making it difficult to conform to changes in user position
Solution Approach 1:
The vertical frame sections are designed with dynamic deformation capabilities, allowing them to change shape in response to user positioning. The first and second vertical frame sections can deform in the width direction, while the third and fourth sections can deform in the height direction, enabling the backrest to dynamically adapt to various user postures while maintaining reliable support through the interconnected frame structure.
3Reliability
If the backrest is supported by carrier members in the middle to provide stability, then the support reliability is improved, but the deformability at the sides is reduced making it difficult to conform to user posture changes
Solution Approach 1:
The backrest is segmented into multiple vertical frame sections that are distributed across the width and height, rather than being supported by single central carrier members. This segmentation enables side sections (first and second vertical frame sections) to deform independently in the width direction while central sections provide stability, allowing the entire backrest to conform to user posture changes while maintaining support reliability.
4Reliability
If the arms support the back member axially to prevent excessive deformation, then the support reliability is improved, but the deformability in out-of-plane direction is reduced making it difficult to accommodate reclining motions
Solution Approach 1:
Different vertical frame sections are assigned different deformation characteristics based on their local requirements. The first and second vertical frame sections are designed to deform in the width direction to accommodate lateral positioning, while the third and fourth sections are designed to deform in the height direction to accommodate reclining motions. This local differentiation allows the backrest to provide reliable axial support while enabling necessary deformations in specific directions.
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 configuration allows the chair to reliably support the user's back and conform to changes in posture, ensuring stable seating and effective load distribution, even when the user reclines, by allowing the backrest to deform and adjust to the user's position.
Implementation Method 1
a deformable section that extends upward from the lower connection section and is elastically deformable according to a load applied to the backrest from the back of a user
Data Source
AI summary
A chair includes: a leg body; a backrest supporting body supported by the leg body; a backrest rear supporting member supported by the backrest supporting body; and a backrest that is supported by the backrest rear supporting member and supports the back of a user. The backrest has: a flexible upholstering material configured to receive the back of the user and is displaceable depending on the back; and a pair of vertical frame sections that are mounted on the upholstering material, have lower ends connected to the back rest rear section support section, and are separated in a width direction in which twisting deformation is allowed depending on a force applied from the upholstering material.