Split-Seat Chair Mechanism for Stable 3D Sideways Pivoting
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Solution Overview
Problem
Existing chair designs that allow all-round pivotability restrict freedom of movement and require constant user intervention to prevent unwanted tilting, compromising safety and stability in the upright position.
Innovation Solution
A chair design where the left and right sides of the seat move independently, with a pivoting axis parallel to the knee axis, and a mechanism allowing the seat and backrest to move relative to each other, incorporating ball joints and spring systems for adjustable pivotability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the entire seat is formed as a rigid component that tilts towards the left or right, then the structure is simple and stable, but the freedom of movement is restricted and cannot follow natural three-dimensional movements of the user
Solution Approach 1:
The seat is divided into two independent halves (left and right sides), each capable of moving independently. This segmentation allows the seat to adapt to natural three-dimensional movements of the user while maintaining structural simplicity through modular design
2Ease of operation
If the pivoting joint is arranged centrally in the vicinity of the vertical centre axis, then the mechanism is simple, but the user must constantly cooperate to prevent unwanted tilting, compromising safety and stability
Solution Approach 1:
Instead of placing the pivoting joint centrally at the top, the invention inverts the arrangement by positioning the pivoting axis at the bottom of the seat, parallel to the knee axis. This inversion allows the user's natural body weight to provide stabilizing force rather than requiring constant active intervention, thereby improving both ease of operation and reliability
3Adaptability or versatility
If the flexibility is adjusted in hardness, then the mechanism can be tuned, but the freedom of movement and adaptation to body movements is still restricted
Solution Approach 1:
The invention introduces dynamic movement capability by allowing the two seat halves to pivot independently relative to the base support. This dynamic design enables the seat to adapt to body movements through natural three-dimensional motion rather than relying solely on hardness adjustments, achieving adaptability without excessive mechanism complexity
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
Enables natural three-dimensional movement while maintaining safety in the upright position, allowing for comfortable seating and harmonized tilting without losing contact with the backrest, and can be adjusted for different user weights.
Implementation Method 1
incorporating ball joints and spring systems for adjustable pivotability and stability
Data Source
AI summary
The chair according to the invention has a seat and a seat mechanism, wherein the seat and the seat mechanism are formed so that, during the sideways pivoting movement of the seat, the one side of the seat is movable independently of the other side of the seat, wherein the seat is mounted so as to be pivotable about a pivoting or rotation axis lying parallel to the knee axis of the user.