Chair assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional chair assemblies fail to provide stable and comfortable seating due to limitations in adjustable reclining angles and unstable center of gravity, leading to inadequate support and risk of toppling.
Innovation Solution
A chair assembly design featuring a base, a supporting frame with guiding grooves, a seat with pivotable connections to the backrest and operating rods, allowing independent adjustment of reclining angles and inclining positions to maintain stability and comfort, with a footrest mechanism for enhanced support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seat is designed with a smaller upward inclining angle to support user weight, then sitting comfort is improved, but the ability to provide lying comfort is reduced
Solution Approach 1:
The patent implements dynamic adjustability by allowing the seat to change its inclining angle from a smaller angle during sitting to a larger angle during lying. The seat includes a movable connection between the seat plate and base, enabling the seat to pivot and adjust its inclination angle according to different usage scenarios, thus providing both sitting and lying comfort.
2Device complexity
If the backrest and seat are fixed at a fixed angular relation, then structural simplicity is maintained, but the ability to independently control backrest angular position is lost
Solution Approach 1:
The patent segments the adjustment mechanisms by providing independent control for the backrest angle and seat inclination angle. The backrest is connected to the seat through a pivotal connection with an adjusting mechanism, while the seat has an independent movable connection with the base. This segmentation allows each component to be adjusted independently, enhancing adaptability while maintaining reasonable structural complexity.
3Ease of operation
If the seat pivots rearwards while the backrest reclines, then lying comfort is improved, but the center of gravity becomes unstable causing the chair to topple
Solution Approach 1:
The patent addresses the stability issue by designing the movable connection between the seat and base with proper geometric constraints and guiding mechanisms. The seat plate can pivot to increase inclination angle, but the connection structure ensures that the center of gravity remains within a stable range through guided motion paths and appropriate pivot point positioning, preventing the chair from toppling while still providing lying comfort.
4Ease of operation
If the upward inclining angle of the seat is increased significantly to impart user weight to the backrest, then lying comfort is improved, but the chair becomes unstable due to gravity shifting behind the base
Solution Approach 1:
The patent implements dynamic angle adjustment with controlled ranges. The seat can increase its inclination angle to provide lying comfort, but the movable connection structure defines specific angular limits that prevent the center of gravity from shifting too far behind the base. This dynamic control with geometric constraints ensures both comfort and stability are maintained within safe operating parameters.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A chair assembly includes a supporting frame (2) disposed above a base (1) and including a first guiding groove (24). A seat (4) is pivotably connected to a backrest (3). Lower and front guiding wheels (451) are mounted to rear and front ends of the seat (4), respectively. At least one operating board (51) includes rear and front ends respectively having second and third guiding grooves (54,55). The lower guiding wheel (442) is movably received in the first and second guiding grooves (24,54). The front guiding wheel (451) is movably received in the third guiding groove (55). A first operating rod (7) is pivotably connected between the supporting frame (2) and the seat (4). When the operating rod (7) retracts, the lower guiding wheel (442) is located in rear ends of the first and second guiding grooves (24,54), and the front guiding wheel (451) is located in a rear end of the third guiding groove (55). The seat (4) moves downwards and rearwards, and the front end of the seat (4) inclines upwards.