Classroom chair having a multifunction seatback
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Solution Overview
Problem
Current classroom and work environment furniture lacks versatility in seating positions, failing to adapt to diverse collaborative settings where occupants need different seating or standing configurations.
Innovation Solution
A classroom chair design featuring a base with adjustable legs and a backrest with utility surfaces, allowing for multiple seating and standing positions, providing stability and support through strategically positioned legs and a support frame that can engage the floor in various configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional classroom chairs are designed for single-purpose seating, then structural simplicity is maintained, but adaptability to different seating and standing positions is limited
Solution Approach 1:
The backrest is designed with a dual-function utility surface that can support work objects when the occupant is seated or serve as a support surface when the occupant is standing. The backrest includes a back support surface for traditional seating and an extended utility surface with armrest sections that can support the occupant's weight in standing positions, allowing one structure to fulfill multiple functions.
Solution Approach 2:
The utility surface extends horizontally from the backrest at a height that allows it to function as both a work surface and a support surface. This horizontal extension into a new dimensional plane enables the backrest to support occupants in standing positions while maintaining its traditional back support function, adding versatility without significantly increasing structural complexity.
2Reliability
If the backrest is designed to support standing occupants, then stability in standing positions is improved, but the chair's structural complexity increases
Solution Approach 1:
The backrest's utility surface serves multiple functions: it supports work objects during seated work, provides armrest support, and can bear the occupant's weight in standing positions. This multi-functional design improves reliability across different usage scenarios while avoiding the need for separate structures for each function.
Solution Approach 2:
The back support surface and utility surface are merged into a single integrated backrest structure. The utility surface extends from the back support surface and includes armrest sections, combining multiple support functions into one unified structure rather than using separate components.
3Reliability
If ground-engaging legs are positioned rearward of the backrest, then stability when supporting standing occupants is improved, but the chair's footprint increases
Solution Approach 1:
The base configuration uses an asymmetric arrangement where at least one ground-engaging leg is positioned rearward of the outermost portion of the backrest. This asymmetric placement creates a longer moment arm for stability in the rearward direction while minimizing the overall footprint of the chair base.
Solution Approach 2:
The base is designed with ground-engaging legs positioned to prevent tipping before it occurs during normal use. By placing legs rearward of the backrest, the chair is pre-configured with adequate stability margin for supporting standing occupants, preventing instability issues before they arise.
Data Source
AI summary
A classroom chair includes a seat and a backrest, where the chair facilitates a wide variety of uses by an occupant. The backrest includes a center section and a pair of armrest sections that extend from the center section. The pair of armrest sections and center section each include a utility surface located in a plane parallel to a seating plane. Each of the armrest sections includes a lower edge positioned above the lowermost portion of the center section, which allows the occupant's legs to be located beneath the armrest sections. In one embodiment, the classroom chair includes a base having four legs. In another embodiment, the base includes two legs joined to a support frame have four stub legs. At least one of the legs extends rearward past the backrest such that the base provides required support for the occupant when the occupant's weight is supported by the backrest.