Chair structure and chair
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Solution Overview
Problem
Existing chair structures with synchronizing mechanisms for back and seat tilt are either complex, aesthetically unpleasing, or inconvenient to configure with a single piece of mesh fabric, and often require excessive force for users to adjust the seat position, limiting their comfort and usability across different weights and preferences.
Innovation Solution
A chair structure featuring a four-bar linkage mechanism with a lever driving member that allows the seat support to be lifted and tilted in conjunction with the chair back, enabling easy adjustment and integration of mesh fabric from top to bottom, while using a reset compression spring for adaptive support and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a four-point linkage mechanism is used to synchronize back and seat tilt, then the restoring force is improved and applicable to users of different weights, but the device complexity increases
Solution Approach 1:
The tilting mechanism is divided into two independent but coordinated systems: a four-point linkage mechanism for backrest tilt and a lever-driven mechanism for seat tilt. This segmentation allows each mechanism to be optimized independently while working together to achieve synchronized motion and adaptive restoring force for users of different weights.
Solution Approach 2:
The lever-driven mechanism acts as an intermediary that connects the backrest tilt motion to the seat tilt motion. When the user leans back, the lever mechanism transfers this motion to lift the seat forward, creating a coordinated synchronization effect without requiring a complex integrated system.
2Ease of manufacture
If the lever driving member is positioned on the same surface as the seat support, then the mesh fabric can be integrated from top to bottom, but the structural design becomes more constrained
Solution Approach 1:
The lever driving member is positioned on the same horizontal surface as the seat support, effectively utilizing the two-dimensional plane of the seat assembly. This spatial arrangement allows the mesh fabric to be stretched continuously from the backrest through the seat without interruption, achieving full integration while maintaining a relatively simple structural design.
3Adaptability or versatility
If the chair back assembly rotates rearward to tilt, then the seat support is lifted diagonally rearward, but the force required increases for users
Solution Approach 1:
The lever-driven mechanism functions as a mechanical counterweight system. As the chair back rotates rearward during tilting, the lever mechanism automatically lifts the seat support diagonally rearward, counterbalancing the weight of the user and the seat assembly. This reduces the effort required from the user to initiate and maintain the tilting motion.
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 structure provides comfortable and adaptable seating for users of various weights, allowing easy leaning and rising without manual effort, with a streamlined aesthetic and integrated mesh fabric configuration, accommodating different user preferences and body types.
Implementation Method 1
a reset device, which comprises a compression spring, is arranged at the front of the chair back assembly; when the chair back assembly tilts rearward, the compression spring generates elastic force to push the chair back assembly forward
Implementation Method 2
The present chair structure forms a four-bar linkage mechanism by means of a seat support which has rotary connection with the front part of the base through a transition link, a chair back assembly and a lever driving member
Data Source
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AI summary
A chair structure and a chair. The chair structure comprises: a base (1) configured as connected to a chair base component; a seat support element (2), the seat support element (2) being provided above the base (1), and the front part of the seat support element (2) being rotatively connected to the front part of the base (1) via a transition connecting rod (8); a chair back component (3), the chair back component (3) being rotatively connected to the rear part of the base (1) via pivots (6); and a lever driving element (7) connected between the chair back component (3) and the seat support element (2), the lever driving element (7) being rotatively connected to the rear part of the seat support element (2), and the lever driving element (7) being arranged roughly on a same plane with the seat support element (2). The chair back component (3), when rotating rearwards around the pivots (6) from an initial position, lifts up the rear part of the seat support element (2) in an obliquely rearward direction via the lever driving element (7) and, at the same time, lifts up the transition connecting rod (8) and the front part of the seat support element (2). The chair structure forms one quad-connecting rod-lever-connecting arm structure. During use, the base (1) remains fixed, a force that the human body applies to the chair back component (3) is transmitted and drives the seat support element (2) to implement lifting/lowering on the base (1), thus implementing forward or rearward tilting.