Adjustable Chair Seat Depth for Adult and Child Use
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Solution Overview
Problem
Existing chairs that are height-adjustable for both adults and children often have a dirty footrest that requires frequent cleaning, making them impractical for use as a seat for adults due to hygiene concerns.
Innovation Solution
A chair design with a seat that adjusts in depth to accommodate adults and children, featuring a safety bracket and a footrest that is easy to clean, utilizing a main frame and support frame with guide rails and pockets to achieve step-by-step height adjustment, ensuring the seat is securely positioned and hygienic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a footrest is added to provide sufficient seating area for adults, then the seating area is improved, but the chair requires frequent cleaning due to dirt accumulation on the footrest
Solution Approach 1:
The footrest is made height-adjustable and can be positioned in different locations relative to the seat, allowing it to be moved to a position where it does not interfere with the seating area or where it is less prone to dirt accumulation. The dynamic repositioning capability allows the footrest to adapt to different usage scenarios.
Solution Approach 2:
The footrest's height and position parameters can be changed to optimize both the seating area and ease of cleaning. By adjusting the footrest to a lower position or repositioning it, the design allows the seating surface to remain clean while still providing adequate leg support.
2Ease of operation
If the seat depth is increased to accommodate adults, then comfort for adults is improved, but the seat surface area available for children is reduced
Solution Approach 1:
The seat depth is made adjustable, allowing it to be extended for adult use or retracted for child use. This dynamic adjustment capability enables the same seat to provide adequate surface area for children while maintaining sufficient depth for adult comfort when needed.
Solution Approach 2:
The seat structure is divided into adjustable segments that can be reconfigured based on the user's size. The seat depth adjustment mechanism allows the seat to be segmented into different effective lengths, providing optimal surface area for children and adequate depth for adults.
3Adaptability or versatility
If the seat is positioned higher to serve as a high seat for children, then child usability is improved, but the seat surface area is reduced
Solution Approach 1:
Both the seat height and seat depth are made independently adjustable. When the seat is positioned higher for child use, the seat depth can be extended to compensate for the height adjustment, maintaining adequate seat surface area. This dynamic coordination of multiple adjustments allows the seat to provide both high seat functionality and sufficient surface area.
Solution Approach 2:
The seat depth adjustment mechanism is nested within the overall height adjustment system. By coordinating the extension of the seat depth with the elevation of the seat height, the design ensures that even when raised to high seat position, the seat maintains adequate surface area for child comfort.
Data Source
AI summary
The invention relates to a chair which can be used as a chair for adults and as a high chair for a child. The invention addresses the problem of making in both cases an adapted size of the seating available. The chair according to the invention comprises a base (1) having a back rest (4) and a seating (5), said seating (5) being retained on the base (1) so as to be height-adjustable. The seating (5) has a depth suitable for an adult. If the seating is brought into an elevated position, part of it is located behind the back rest (4) so that the effective seating which is in front of the back rest is adapted to the depth required by a child.