Collapsible Chair Four-Point Support for Uneven Ground Stability
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Solution Overview
Problem
Conventional collapsible chairs for leisure experience instability and reduced seating comfort due to increased contact area with the ground, leading to potential shaking or unbalance, especially on uneven surfaces.
Innovation Solution
A collapsible chair design featuring rear and sub support poles with insert parts into coupling holes, elastic cables for vertical and horizontal connections, and rubber caps for a four-point supporting structure, providing a stable and comfortable seating experience by distributing weight evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional collapsible chairs use U-shaped legs with increased ground contact area, then the chair structure is simple and easy to manufacture, but the chair becomes unstable and shakes on uneven surfaces
Solution Approach 1:
The chair leg structure is segmented into multiple independent support poles (front support pole, rear support pole, and intermediate support pole) instead of using a single U-shaped leg. Each pole is independently adjustable and connectable to the seat frame, allowing the chair to adapt to uneven ground surfaces while maintaining stability. The segmentation enables each pole to independently contact the ground at optimal positions, preventing the shaking and unbalance caused by rigid U-shaped legs.
2Stability of the object's composition
If the chair uses a four-point supporting structure with adjustable support poles, then the chair stability is improved, but the device complexity increases
Solution Approach 1:
The support pole structure employs a telescopic nested design where multiple tubular segments are inserted within each other. The first support pole, second support pole, and intermediate support pole all feature nested tubular structures that can extend or retract to adjust the overall length and ground contact position. This nesting approach allows the complex four-point support structure to be compact when folded and easily adjustable during use, reducing the perceived complexity while maintaining stability.
Solution Approach 2:
The support poles incorporate dynamic adjustment mechanisms that allow users to modify the length and angle of each pole according to ground conditions and user preferences. The telescopic segments can be extended or retracted, and the connection points on the seat frame are positioned at different locations to accommodate various configurations. This dynamic adaptability enables the chair to maintain optimal stability on different terrains without requiring a completely different structure for each scenario.
3Adaptability or versatility
If the support poles are made adjustable with telescopic segments, then the adaptability to different ground conditions is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The telescopic support poles are designed with multiple segments of substantially equal cross-sectional area and similar structural characteristics. Each segment can be manufactured using the same or similar processes, ensuring consistent quality and simplifying production. The segments are equipped with standardized connection features (such as pins, clips, or locking mechanisms) that allow them to be assembled with relatively simple precision requirements. This equipotential design approach reduces the overall manufacturing precision demands compared to designing segments with vastly different geometries or assembly requirements.
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 enables easy assembly and folding while ensuring a stable and strong outdoor chair with a relaxed seating sensation by utilizing a four-point supporting structure that minimizes ground contact and enhances stability.
Implementation Method 1
first elastic cables whose upper ends are fixed into the seatback support poles and lower ends are fixed into the rear support poles so as to elastically connect these support poles in a vertical direction; and second elastic cables whose front ends are fixed to the first connect parts of the couplers and rear ends are fixed into the sub support poles so as to elastically connect these support poles in horizontal direction
Data Source
AI summary
Disclosed is a collapsible chair for leisure which includes: rear support poles 112 having insert parts 113 inserted into first coupling holes 102 formed in a main body 101; seatback support poles 111 connected to the insert parts 113 of the rear support poles 112; sub support poles 125 having insert parts 126 inserted into second coupling holes 103 formed in the main body 101; first seat support poles 121 connected to the insert parts 126 of the sub support poles 125; couplers having insertion holes 123, and first and second connect parts 122a and 122b formed at opposite ends thereof; second seat support poles 124 connected to second connect parts 122b of the couplers; front support poles 131 inserted into the insertion holes 123 of the couplers 122; and first and second elastic cables 115 and 128 for elastically connecting the support poles.