Multi-Link Folding Chair Structure for Slim Collapse and Stability
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Solution Overview
Problem
Conventional folding chairs occupy too much space when collapsed and lack stability and load capacity when extended, due to their design which maintains a large width in the collapsed state and relies on limited support from the frame and legs.
Innovation Solution
The design incorporates U-shaped frame members, inverted U-shaped armrests, and a locking mechanism that allows the chair to collapse into a slim-folded state while extending into a stable and load-capable position, utilizing a network of pivoting connections and a locking element to facilitate easy portability and enhanced structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the conventional folding chair is collapsed with the legs and seat pivotally moved toward the frame, then the chair can be folded for storage, but the frame and seat maintain an overall width the same as the extended state, occupying relatively large space
Solution Approach 1:
The patent applies dimensionality change by transforming the folding mechanism from a single-plane pivot to a multi-dimensional collapsing action. The front and rear supports pivot relative to the frame while the legs move in coordinated arcs, enabling the chair to collapse not only forward but also inward, reducing width in addition to height. This multi-dimensional motion allows the chair to achieve a compact configuration that minimizes space occupation in multiple directions simultaneously.
Solution Approach 2:
The patent employs dynamics by implementing a mechanism where multiple components move in coordinated, interdependent motions during collapse. The front supports, rear supports, and legs are connected through pivots that allow dynamic adjustment of angles and positions. This dynamic system enables the chair to transition smoothly from the extended state through intermediate configurations to the fully collapsed state, optimizing space reduction while maintaining structural integrity throughout the transformation.
2Stability of the object's composition
If the conventional folding chair is extended for use, then the legs and seat can be pivotally extended to provide seating, but the chair is supported only by the bottom of the frame and two legs, providing limited stability and load capacity
Solution Approach 1:
The patent applies segmentation by dividing the support structure into multiple independent but coordinated elements: front supports, rear supports, and legs, each connected through pivots. Instead of relying on a single rigid frame, the chair uses segmented components that can independently adjust and lock into position. This segmentation allows each component to contribute to overall stability while distributing load across multiple contact points, enhancing both stability and load capacity.
Solution Approach 2:
The patent combines multiple support functions into a unified mechanism where the front supports, rear supports, and legs work together as an integrated system. The pivots serve as merging points that coordinate the motion and positioning of different components. When extended, all these components simultaneously provide support, creating a stable structure with distributed load-bearing capacity that is greater than the sum of individual components acting separately.
Data Source
AI summary
A folding chair includes U-shaped first to fourth supporting frame members, U-shaped first to third legs, inverted U-shaped first and second armrests, first to fourth seat receivers, first to fourth front supports, first to fourth rear supports, first to fourth front connecting members, first to fourth rear connecting members, first to third backrest supports, a locking element, a seat and a backrest. All these members can be smoothly pivotally turned about corresponding couplers or unions, enabling the folding chair to be collapsed into a slim-folded state to occupy a very small space and be easily portable, or be fully extended from the collapsed state to provide improved stability and load capacity in use.