Seat structure and chair
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Solution Overview
Problem
Existing chair designs with swivel mechanisms are complex, uncomfortable, and aesthetically unpleasing, requiring significant force to adjust the seat and backrest, and are not suitable for configuring mesh fabric as a single piece.
Innovation Solution
A seat structure featuring a four-bar linkage mechanism with a lever driving member and reset spring, allowing the chair back and seat to be connected as a whole with integrated mesh fabric, enabling easy adjustment and comfort for users of varying weights without manual force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the chair back and seat are connected with separate mesh fabrics, then the structure allows independent configuration, but the aesthetic appearance deteriorates and the overall streamlined look is lost
Solution Approach 1:
The patent merges the chair back and seat mesh fabrics into a single integrated piece that covers both components continuously. This unified mesh fabric configuration eliminates the visual discontinuity of separate fabrics while maintaining ease of installation through the integrated design, directly resolving the contradiction between aesthetic appearance and manufacturing simplicity.
2Ease of operation
If the whole chair seat is lifted rearward to coordinate back and seat movement, then the movement coordination is improved, but the device complexity increases and significant force is required
Solution Approach 1:
The patent employs asymmetric linkage mechanisms where the chair back and seat are connected through strategically positioned linkages with different arm lengths and pivot points. This asymmetric design enables automatic movement coordination between the back and seat during tilting operations, achieving smooth coordinated motion without requiring complex symmetric mechanisms or excessive force application.
Solution Approach 2:
The patent introduces intermediary linkage components that mediate between the chair back and seat movements. These linkage mechanisms act as intermediaries that automatically translate backrest tilting motion into corresponding seat position adjustments, eliminating the need for direct force application to move the entire seat rearward while maintaining movement coordination.
3Ease of operation
If a four-bar linkage mechanism is used to synchronize back and seat movement, then the movement coordination is improved, but the force required for adjustment increases
Solution Approach 1:
The patent implements dynamic linkage mechanisms with optimized pivot points and arm ratios that adapt the mechanical advantage throughout the range of motion. The linkage geometry is designed to provide favorable force characteristics during the critical phases of tilting, reducing the peak force required while maintaining smooth movement coordination between back and seat components.
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 solution provides a comfortable, aesthetically pleasing, and versatile seating experience by allowing easy leaning and standing with minimal force, accommodating different users and ensuring the lumbar support matches the body's position, preventing separation and friction issues.
Implementation Method 1
a reset spring (71) installed longitudinally between the chair back assembly (3) and the base (1)
Implementation Method 2
The present seat structure forms a four-bar linkage mechanism by means of a seat support (2) which has rotary connection with the front part of the seat through a transition link (8), a chair back assembly (3) and a lever driving member (7)
Data Source
AI summary
A seat structure comprises a base configured to be a chair base assembly; a seat support located above the base, wherein a front part of the seat support has rotary connection with the front part of the base through a transition link; a chair back assembly having rotary connection with a rear part of the base through a pivot; a lever driving member linked between the chair back assembly and the seat support, and having rotary connection with a rear part of the seat support, wherein the lever driving member and the seat support are approximately on the same surface. When the chair back assembly rotates rearward around the pivot from the initial position, the rear part of the seat support is raised diagonally to the rear through the lever driving member, meanwhile the transition link and the front part of the seat support are pulled up.