Chair with Elastic Link for Equal Support Across User Weights
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Solution Overview
Problem
Conventional chairs fail to provide optimal support for users' backs and buttocks regardless of weight, leading to discomfort and potential health issues due to restricted movement and uneven weight distribution, and cannot be adjusted to accommodate varying user weights effectively.
Innovation Solution
A chair design featuring a seat and backrest separated at their rear and lower ends, respectively, with an elastic link connecting them, allowing for adjustable support and tilting to maintain comfort and stability across different user weights, incorporating cut-outs, a lever, and features like a protrusion, guide slit, bearing, and stopper to optimize ergonomic alignment and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the seat and backrest are rigidly connected, then structural stability is improved, but the ability to adapt to different user weights is worsened
Solution Approach 1:
The chair is divided into separate seat and backrest components connected by an elastic link rather than being rigidly integrated. This segmentation allows each component to move independently and adapt to user weight while maintaining overall structural stability through the elastic connection.
Solution Approach 2:
The rigid connection is replaced with a dynamic elastic link that allows controlled movement and deformation. The elastic link can dynamically adjust its deformation angle based on user weight, providing adaptability while maintaining structural integrity through elastic forces.
2Adaptability or versatility
If elastic means are added to allow deformation, then adaptability to different user weights is improved, but the ability to provide optimal deformation angle is worsened
Solution Approach 1:
The elastic link's physical parameters (deformation angle, stiffness) are specifically designed and adjusted to provide optimal support. By carefully selecting the elastic properties and geometric parameters of the link, the system achieves both adaptability to different weights and controlled deformation angles for ergonomic support.
3Ease of manufacture
If the backrest is fixed at a predetermined tilt angle, then ease of manufacture is improved, but user comfort during prolonged sitting is worsened
Solution Approach 1:
The fixed backrest is replaced with a dynamic system where the backrest can tilt relative to the seat through the elastic link. This dynamic configuration automatically adjusts to user weight and sitting posture, providing ongoing comfort without complex manual adjustment mechanisms.
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 equal support for users' backs and buttocks regardless of weight, allowing for optimal ergonomic alignment, reducing friction, and preventing excessive tilting, thereby enhancing comfort and stability while maintaining a stable posture.
Implementation Method 1
an elastic link elastically connecting a side portion of the seat to a side portion of the backrest
Data Source
AI summary
A chair includes a seat, a backrest, and an elastic link. The seat supports a user's buttocks, wherein the backrest supports the user's back, the elastic link elastically connects a side portion of the seat to a side portion of the backrest, the seat includes a seat free end formed at a rear portion thereof without being connected to the backrest and the backrest includes a backrest free end formed at a lower portion thereof without being connected to the seat.