Foldable Chair Leg Linkage for Clearance-Controlled Folding
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Solution Overview
Problem
Conventional foldable chairs lack efficient mechanisms to maintain clearance spaces between components during folding and unfolding, leading to potential damage and limited storage efficiency.
Innovation Solution
The implementation of fold-control linkages and spacing-control means that couple the front and rear legs to each other and the seat to the frames, allowing for relative movement and maintaining minimum clearance spaces between the seat and frames, as well as between the legs, ensuring safe folding and unfolding while preserving the expanded use position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chair is folded to a collapsed position for storage, then storage efficiency is improved, but clearance spaces between components may be insufficient causing potential damage
Solution Approach 1:
The patent implements dynamic leg mechanisms that automatically adjust the clearance spaces between components during the folding process. The legs are designed to move relative to each other in a controlled manner, maintaining sufficient clearance even in the collapsed position, thus preventing damage while achieving compact storage.
Solution Approach 2:
The patent changes the spatial parameters (clearance spaces) between legs and seat during folding by using controlled mechanical movement. The system transitions from a static clearance design to a dynamic one where clearance parameters are actively maintained through the folding mechanism, ensuring damage prevention throughout the motion range.
2Device complexity
If the chair is designed with fixed leg positions, then structural simplicity is maintained, but the chair cannot maintain clearance spaces during folding causing component damage
Solution Approach 1:
The patent transforms the static leg positioning into a dynamic system where legs can move relative to each other during folding. This controlled movement allows the maintenance of clearance spaces without requiring complex active control systems, achieving reliability through mechanical design rather than sophisticated mechanisms.
3Ease of operation
If the chair allows full movement of legs during folding, then ease of operation is improved, but clearance spaces may be compromised leading to damage
Solution Approach 1:
The patent implements controlled parameter changes in the leg positions during folding operations. The mechanism allows smooth, unrestricted folding motion while simultaneously maintaining minimum clearance parameters through the geometric design of the leg movement paths, ensuring both ease of operation and component protection.
Data Source
AI summary
The present disclosure relates to a foldable chair having an expanded use configuration and a collapsed storage configuration. The foldable chair includes front and rear legs, a seat back coupled to the front legs, and a seat bottom mounted to pivot relative to the front and back legs.