Telescopic Leg Assembly for Height-Adjustable Portable Chair
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Solution Overview
Problem
Conventional portable folding chairs typically have a fixed low height, limiting user visibility and comfort in outdoor settings, as they do not allow for adjustable seating height, which restricts the field of vision and is not optimal for various recreational activities.
Innovation Solution
A height-adjustable portable chair with telescopic leg-expansion and contraction mechanisms, allowing users to vary the chair's height from 42 inches to 60 inches, featuring a seat, back support, armrests, and optional solar panel for power, enabling improved visibility and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the chair height is increased to improve visibility and field of vision, then the user's field of vision is improved, but the chair becomes less stable and more difficult to collapse for portability
Solution Approach 1:
The chair employs telescopic leg assemblies that can dynamically adjust between extended and retracted positions, allowing the chair height to be varied from a low stable position for portability to a high position for improved visibility. The legs include locking mechanisms that maintain stability at each extended position while enabling easy transition between height configurations.
Solution Approach 2:
The leg assemblies are divided into multiple telescopic sections that can be independently extended or retracted. Each leg consists of nested tubular sections with locking pins or cam mechanisms, allowing the leg length to be adjusted in discrete increments to achieve optimal height while maintaining structural integrity and stability.
2Illumination intensity
If the chair height is increased to improve visibility, then the user's field of vision is improved, but the chair becomes more complex and heavier
Solution Approach 1:
The telescopic leg assemblies provide dynamic height adjustment capability through nested tubular sections that can be extended or retracted as needed. This dynamic structure allows the chair to transform from a compact portable form to an elevated viewing position, achieving improved visibility without requiring multiple separate chair structures.
Solution Approach 2:
The leg assemblies utilize a nested doll configuration where multiple tubular sections are inserted within one another. The innermost section contains the locking mechanism, which is received within an intermediate section, which in turn is received within the outermost section. This nesting arrangement provides height adjustment capability while minimizing the stored volume when legs are retracted, reducing overall chair complexity.
3Illumination intensity
If the chair height is increased to improve visibility, then the user's field of vision is improved, but the chair becomes less portable and harder to transport
Solution Approach 1:
The chair employs dynamically adjustable telescopic leg assemblies that can be quickly extended to provide improved visibility or retracted to a compact configuration for easy portability and transport. The locking and unlocking mechanisms are designed for rapid operation, allowing the chair to transition between portable and elevated states without requiring significant effort or time.
Solution Approach 2:
The nested tubular leg sections collapse into one another when retracted, minimizing the overall chair volume and making it compact enough for easy transport in vehicle trunks or storage spaces. This nesting configuration reduces the material required compared to solid extended legs, thereby reducing weight while maintaining the ability to achieve elevated positions when needed.
Data Source
AI summary
A height adjustable chair includes a user support platform assembly, and posterior and anterior leg assemblies. The user support platform assembly includes first, second, and third platform portions, and a pair of pivot mechanisms. The posterior and anterior leg assemblies include laterally opposed upper leg portions, laterally opposed lower leg portions, and locking mechanisms for locking the lower leg portions in extended relation relative to the upper leg portions. The pivot mechanisms pivotally attach to first platform portion and the posterior leg assembly. The anterior leg assembly is pivotally attached to the posterior leg assembly, the first platform portion, and the third platform portions. The first support platform supports a user thereupon. The anterior and posterior leg assemblies enable the user to vary the height of the first support platform relative to a support surface.