Chair
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Solution Overview
Problem
Conventional chairs lack a mechanism to dynamically adjust the angle between the seat and back surfaces for enhanced comfort and support, particularly in reclined positions, leading to inadequate ergonomic alignment and reduced seating experience.
Innovation Solution
The chair design incorporates an elastically deformable extension between the back shell and seat shell, connected via lateral struts and a tilt housing with angled tracks, allowing the seat shell to move in an arcuate path relative to the back shell, thereby adjusting the angle between the seat and back surfaces in response to user inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the chair uses a fixed rigid connection between seat shell and back shell, then the structural stability is improved, but the adaptability for different reclining positions deteriorates
Solution Approach 1:
The back shell includes an extension that is elastically deformable, allowing the connection between the seat shell and back shell to dynamically adjust during reclining. This elastic deformation enables the structure to adapt to different angles while maintaining stability through controlled flexibility rather than rigid fixation.
Solution Approach 2:
The chair mechanism changes the geometric parameters of the seat-back angle through controlled elastic deformation of the extension. As the user reclines, the extension deforms elastically, allowing the back shell to pivot relative to the seat shell at different angles, thus adapting the seating configuration to various reclining positions.
2Adaptability or versatility
If the chair incorporates an elastic deformation mechanism for dynamic angle adjustment, then the adaptability for reclining positions is improved, but the device complexity increases
Solution Approach 1:
The extension of the back shell is designed as an elastically deformable component that functions as a flexible structural element. This flexible extension replaces complex mechanical adjustment mechanisms with a simpler elastic deformation system that naturally accommodates angle changes through material flexibility rather than multiple moving parts.
Solution Approach 2:
The back shell is segmented into a main body and an extendable portion that can deform independently. This segmentation allows the extension to flex and deform elastically while the rest of the back shell maintains its structural integrity, enabling adaptive movement without requiring the entire structure to be complex or movable.
3Ease of operation
If the extension is made elastically deformable to allow movement, then the ease of operation for reclining is improved, but the strength of the connection deteriorates
Solution Approach 1:
The extension utilizes elastic deformation to change its geometric parameters (length, angle) in response to applied forces during reclining. This elastic behavior allows smooth, controlled movement that is easy to operate while the material's elastic properties ensure the connection maintains sufficient strength to support the chair structure and user weight.
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 design enhances seating comfort by dynamically adjusting the angle between the seat and back surfaces, providing improved ergonomic support and allowing for a more natural reclining position, with the elastic deformation mechanism facilitating a smooth transition between upright and inclined positions.
Implementation Method 1
The extension is elastically deformable
Data Source
AI summary
A chair includes a base, a receptacle coupled to an upper end of the base, and a seat shell forming a seat surface. The seat shell is supported by the receptacle. The chair also includes a back shell forming a back surface. The back shell is connected to the seat shell on both sides of the seat surface and on both sides of the back surface. The back shell includes an extension extending from the back surface to the receptacle under the seat shell. The extension is elastically deformable.