Portable Folding Chair Leg Stops for Uneven Ground Stability
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Solution Overview
Problem
Conventional portable folding chairs lack position limits for their supporting legs, leading to instability and a high risk of falling when used on uneven ground, making them unsafe for users.
Innovation Solution
The design incorporates limiting plates and lugs on the fixed seat, a torsion spring, and anti-skid rubber sleeves to stabilize the supporting legs, preventing excessive unfolding and shaking, and ensuring secure attachment to the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the supporting legs are rotatably connected to the fixed seat without position limits, then the chair is easy to assemble and disassemble, but the supporting legs shake easily and the chair becomes unstable
Solution Approach 1:
The patent changes the connection parameter from completely free rotation to controlled rotation with position limits. The limiting plates define specific angular positions where the supporting legs can be securely positioned, transforming the connection state from unstable free rotation to stable positioned rotation while maintaining ease of assembly and disassembly.
Solution Approach 2:
The limiting plates act as intermediary elements between the supporting legs and the fixed seat. These plates provide intermediate positioning surfaces that guide and constrain the supporting legs to specific stable positions, mediating the connection to prevent shaking while allowing easy assembly and disassembly.
2Adaptability or versatility
If the supporting legs can be unfolded to a large angle, then the chair is more comfortable to sit on, but the chair is prone to falling over on uneven ground
Solution Approach 1:
The patent changes the angular parameter of the supporting legs by introducing position limits through limiting plates. This constrains the unfolding angle to a specific range that balances sitting comfort with stability, preventing excessive angles that would cause falling on uneven ground while maintaining adequate comfort.
Solution Approach 2:
The limiting plates provide preliminary anti-action by pre-defining safe angular positions before the chair can be assembled. This prevents the supporting legs from being positioned at unstable angles, proactively counteracting the risk of falling on uneven ground while still allowing comfortable sitting positions within the limited range.
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 solution effectively prevents the portable folding chair from falling over on uneven surfaces, enhancing user safety by stabilizing the supporting legs and maintaining structural integrity.
Implementation Method 1
a torsion spring is provided on the first rotating shaft, and two ends of the torsion spring are respectively connected to the supporting leg and the limiting plate
Implementation Method 2
a bottom of the supporting leg is provided with an anti-skid rubber sleeve
Data Source
AI summary
Provided is a portable folding chair, comprising a supporting frame and a cloth cover cushion, wherein the supporting frame comprises a fixed seat, supporting legs rotatably connected to the fixed seat, and a supporting assembly connected to the supporting legs, a plurality of limiting plates and lugs positioned at two sides of the limiting plates are provided on a periphery of the fixed seat, and an accommodating groove for mounting the supporting leg is formed between the limiting plate and the lug. According to the present utility model, the supporting legs are prevented from being unfolded at an excessive angle, it is effectively guaranteed that the supporting legs will not shake on the fixed seat when the portable folding chair is used by a user, and the portable folding chair is effectively prevented from falling due to shaking of the supporting legs when placed on uneven ground.