Triangular Frame Camping Chair for Stable Support and Easy Folding
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Solution Overview
Problem
Camping chairs with quadrangular structures and spring ropes suffer from poor stability and require manual folding against elastic force, making them difficult and inconvenient to use.
Innovation Solution
A foldable camping chair with a triangular supporting frame structure, featuring a connecting unit, rear and front supporting blocks, side and front connecting rods, and supporting legs/rods, articulated with rivets for stability and easy folding by pushing the connecting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a quadrangular structure with spring ropes is used, then the chair can be folded automatically under elastic force, but the stability is poor and manual folding against elastic force is required
Solution Approach 1:
The patent inverts the conventional spring rope mechanism by replacing it with a triangular frame structure that provides inherent stability. Instead of relying on elastic force for automatic folding (which causes instability), the invention uses the geometric rigidity of the triangle to maintain structural stability while enabling easy manual folding through a different mechanical advantage system.
Solution Approach 2:
The patent introduces dynamic articulation points at the vertices of the triangular frame, allowing the structure to transition between folded and unfolded states. The connecting rods and joints enable controlled movement while maintaining stability during use, resolving the contradiction between ease of operation and structural stability.
2Extent of automation
If spring ropes are used for automatic folding, then folding can be automated, but manual folding against elastic force becomes difficult and inconvenient
Solution Approach 1:
The patent extracts the spring rope mechanism from the design and replaces it with a pure mechanical linkage system based on the triangular frame. This removes the automatic folding function that caused operational difficulties while preserving the foldable capability through a more convenient manual mechanism.
Solution Approach 2:
The triangular frame structure serves itself by providing both stability and the folding mechanism through its geometric properties and articulated joints, eliminating the need for separate spring ropes to provide automatic folding functionality.
3Device complexity
If a quadrangular structure is used, then the chair design is simple, but the stability is poor
Solution Approach 1:
The patent inverts the conventional quadrangular design by adopting a triangular frame structure. The triangle's inherent geometric rigidity provides superior stability compared to quadrangular structures, while the articulated joints maintain reasonable design complexity by enabling folding functionality.
Solution Approach 2:
The patent transitions from a planar quadrangular structure to a three-dimensional triangular framework with articulated joints. This dimensional change allows the structure to achieve both stability through the triangular geometry and folding capability through the articulated connections, resolving the complexity-stability contradiction.
Data Source
AI summary
A foldable camping chair, including a foldable supporting frame which includes a connecting unit arranged between two front supporting blocks, a rear supporting block and the two front supporting blocks defining a triangular shape, two side connecting rods, and two front connecting rods; two recessed grooves are formed on a front side of the rear supporting block; two ends of each side connecting rod are movably articulated with a corresponding recessed groove and fixedly plugged in a corresponding front supporting block respectively; two ends of each front connecting rod is movably articulated with an end of the connecting unit and a front supporting block respectively; lower and upper ends of each front supporting block are plugged with a front supporting leg and a front supporting rod respectively; lower and upper ends of the rear supporting block are plugged with a rear supporting leg and a rear supporting rod respectively.