Foldable Chair with Slideable Support Legs for Safe Folding
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Solution Overview
Problem
Conventional foldable chairs face issues with hazardous folding and unfolding due to telescopic pipes and complex mechanisms, which can lead to damage and unsafe operations.
Innovation Solution
A foldable chair design featuring slideable support legs with opposite folding and force-exerting directions, utilizing an annular frame with hinged and sliding components, including sliding sleeves and protrusions, to ensure safety and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If telescopic pipes with lock and stop device are used to enable folding, then the chair can be disassembled and transported, but the structure becomes hazardous when damaged and the lock device experiences large loads
Solution Approach 1:
The patent inverts the conventional telescopic pipe mechanism by using a slideable support leg where the folding direction is opposite to the force-exerting direction. Instead of extending outward to bear load, the leg slides inward during folding, reversing the traditional mechanism to eliminate the hazardous lock device while maintaining folding functionality.
Solution Approach 2:
The patent removes the lock and stop device from the folding mechanism entirely. By extracting this hazardous component and replacing it with a simple slideable hinge connection, the chair maintains its folding capability without the safety risks associated with load-bearing lock mechanisms.
2Adaptability or versatility
If crossed pipes are divided into segments to enable folding, then the chair can be disassembled, but the structure becomes complicated and folding operation is not smooth
Solution Approach 1:
The patent segments the support legs into modular components that connect through slideable hinges. Each leg is divided into sections that can independently slide and fold, creating a simplified segmented structure that maintains smooth folding operation while reducing overall complexity compared to conventional multi-segment crossed pipe designs.
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 design ensures safe and smooth folding/unfolding operations by aligning folding and force directions oppositely, enhancing user safety and providing a more compact structure.
Implementation Method 1
a first sliding sleeve is disposed on the first front portion, and a second sliding sleeve is disposed on the second front portion. The first sliding sleeve is slideable along the first front portion of the annular frame, and the second sliding sleeve is slideable along the second front portion of the annular frame.
Data Source
AI summary
A foldable chair comprises an annular frame, a first support leg, and a second support leg. A first end of the first support leg is hinged to a first fixed rear position of the annular frame. A second end of the first support leg is hinged to a second fixed rear position of the annular frame. A first end of the second support leg is slideably hinged to a first front portion of the annular frame, so that the first end of the second support leg is slideable along the first front portion. A second end of the second support leg is slideably hinged to a second front portion of the annular frame, so that the second end of the second support leg is slideable along the second front portion. The first support leg is pivotally hinged to the second support leg through an intermediate connecting position thereof.