Height-Adjustable Highchair with Dynamic Footprint for Stability
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Solution Overview
Problem
Conventional highchairs with adjustable seats face issues where the base footprint remains fixed, leading to increased susceptibility to tipping when the seat is raised and excessive space usage when lowered, especially in homes with multiple eating surfaces at different heights.
Innovation Solution
A highchair design that adjusts its footprint by rotating and translating legs horizontally and vertically, allowing the seat to raise and lower while changing the base's footprint size, ensuring stability and space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the seat is raised to a higher position, then the child can reach higher eating surfaces, but the highchair becomes more susceptible to tipping due to increased center of gravity height
Solution Approach 1:
The highchair employs a dynamic base footprint that automatically adjusts according to seat height. When the seat is raised, the base footprint expands outward through articulated legs that rotate and translate, increasing the support polygon to compensate for the higher center of gravity. This dynamic adaptation maintains stability across different operating heights.
Solution Approach 2:
The system changes the geometric parameter of the base footprint area in response to seat height adjustments. As the seat height increases, the footprint area increases through mechanical expansion of the leg structure, creating a direct correlation between height parameter and stability parameter that resolves the contradiction.
2Stability of the object's composition
If the base footprint is increased to improve stability, then tip resistance improves, but the space occupied by the highchair increases when lowered
Solution Approach 1:
The base footprint transitions from a static to a dynamic configuration that adapts to operational needs. During active use with the seat raised, the footprint expands to provide stability. When the highchair is lowered for storage or transport, the footprint automatically contracts to minimize space occupation, achieving both stability and space efficiency at different operational states.
Solution Approach 2:
The base is segmented into multiple articulated legs that can independently rotate and translate relative to the central support structure. This segmentation allows the footprint to expand outward when stability is needed and contract inward when space is limited, providing flexible adaptation to different operational requirements.
3Strength
If the legs are made rigid to improve structural strength, then load bearing capacity improves, but the ability to adjust footprint dynamically is reduced
Solution Approach 1:
The leg structure employs controlled articulation points with rotational and translational capabilities that maintain structural integrity while enabling dynamic footprint adjustment. The articulated joints are designed with appropriate strength to bear loads while allowing the necessary degrees of freedom for footprint expansion and contraction during seat height changes.
Data Source
AI summary
In one example, a highchair has a seat and a base. The base is attached to the seat such that, when the base is disposed on a surface, the base supports the seat above the surface. The base has a plurality of legs that are rotatable so as to transition the highchair between a raised position and a lowered position. In the raised position, the seat is disposed at a first height and the plurality of legs together define a first footprint that has a first cross-sectional area in a select plane. In the lowered position, the seat is disposed at a second height, lower than the first height, and the plurality of legs together define a second footprint that has a second cross-sectional area in the select plane that is less than the first cross-sectional area.