Collapsible Portable Chair Frame for Stable Hillside Seating
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Solution Overview
Problem
Conventional portable chairs are not truly portable for outdoor use on uneven terrain, as they lack stability and comfort, especially on hillsides, due to their design which makes them uncomfortable for users of varying weights and unsuitable for uneven surfaces.
Innovation Solution
A portable chair frame design featuring collapsible bars and joints that provide multiple points of contact with the ground, along with a sling system, allowing for stability on uneven terrain and comfort through optimal force distribution and adjustable elements, enabling users to sit securely on hillsides and other outdoor surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional portable chair design (stadium seat with rigid posts and straps) is used, then the chair is simple in structure and easy to manufacture, but it becomes unstable on uneven terrain and uncomfortable for users of varying weights
Solution Approach 1:
The chair legs are divided into multiple telescopic sections that can be adjusted independently. Each leg contains nested tubular sections that can extend or retract to accommodate varying ground heights and uneven terrain, allowing the chair to adapt to different surfaces while maintaining structural integrity
Solution Approach 2:
The chair incorporates dynamic adjustment mechanisms including telescopic legs with locking systems and adjustable armrests that can be modified during use. These dynamic elements allow the chair to transition from a static structure to an adaptable system that responds to terrain variations and user needs
2Strength
If the chair is designed to be lightweight and collapsible for portability, then it is easy to transport and store, but it loses structural strength and stability
Solution Approach 1:
The chair legs utilize a nested telescopic structure where smaller tubular sections are inserted within larger ones. When collapsed, the entire leg assembly compresses to a fraction of its extended length, enabling compact storage and portability while maintaining full structural strength when deployed through the nested support layers
Solution Approach 2:
The chair construction employs composite material strategies combining lightweight aluminum alloys for the tubular sections with high-strength connection joints and locking mechanisms. This composite approach achieves an optimal strength-to-weight ratio, providing structural integrity without excessive weight
3Adaptability or versatility
If fixed rigid posts are used in the chair design, then the chair structure is simple and strong, but it cannot accommodate uneven terrain or hillsides
Solution Approach 1:
The chair incorporates dynamic adjustment mechanisms including telescopic legs with locking systems and adjustable armrests that can be modified during use. These dynamic elements allow the chair to transition from a static structure to an adaptable system that responds to terrain variations and user needs
Solution Approach 2:
The chair design allows for parameter changes in leg length, armrest height, and joint angles to accommodate different terrain conditions. By adjusting these parameters, the chair can adapt to uneven surfaces, hillsides, and various seating preferences without requiring a completely different structure
Data Source
AI summary
The present invention relates to lightweight collapsible portable chairs. In one embodiment, the portable chair has a sling and a chair frame which includes a first pair of bars and a second pair of bars. Each bar of the first pair of bars includes a joint configured to contact a ground surface. In another embodiment, the chair frame includes a front of bars, a back pair of bars, a pair of joints and a center bar configured to securely couple the pair of back joints to each other. In some embodiments, the chair frame includes a front support assembly. In other embodiments, the chair frame includes a pair of lower bars.