Folding chair with armrests
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Solution Overview
Problem
Conventional folding chairs with armrests often experience armrests caving in when elbows are placed on them, and the soft fabric can lead to uneven tightness and height differences, affecting the user experience.
Innovation Solution
A folding chair design featuring armrest tubes hinged to backrest tubes, with armrest sliders and support tubes that allow rotation and sliding, ensuring the armrests maintain stability and uniform height, preventing caving and improving folding functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soft fabric is used for armrests, then comfort is improved, but the armrests cave in when elbows are placed on them and height consistency deteriorates
Solution Approach 1:
The armrest structure is segmented into multiple functional components: armrest tubes for structural support, fabric layers for comfort, and support tubes with sliders for height adjustment. This segmentation allows each component to perform its specific function optimally while working together as an integrated system.
Solution Approach 2:
The armrest structure incorporates dynamic adjustment capabilities through sliders that allow the armrest height to be adjusted. This enables the armrest to adapt to different user needs and maintain optimal height consistency, transforming a static structure into a dynamically adjustable one.
2Ease of operation
If fabric is used for armrests, then softness is improved, but structural strength deteriorates causing caving
Solution Approach 1:
The armrest employs a composite structure combining rigid armrest tubes made of strong material with soft fabric layers. This composite design integrates the strength of the tube structure with the comfort of the fabric, allowing the armrest to resist caving while maintaining softness for user comfort.
Solution Approach 2:
Different parts of the armrest have different properties: the armrest tubes provide localized structural strength where needed, while the fabric layers provide localized softness and comfort where the user contacts the armrest. This local differentiation of material properties optimizes both strength and comfort.
3Adaptability or versatility
If armrest tubes are hinged to backrest tubes, then folding functionality is maintained, but structural complexity increases
Solution Approach 1:
The armrest tubes serve multiple functions: they provide structural support for the armrest, enable folding functionality through hinged connections to the backrest tubes, and act as mounting points for the fabric and support structures. This multi-functionality reduces the need for separate components, thereby managing complexity while maintaining versatility.
Data Source
AI summary
A folding chair with armrests includes a chair frame which includes a left crossed tube structure consisting of a first left crossing tube and a second left crossing tube crossed with and hinged to each other, and a right crossed tube structure consisting of a first right crossing tube and a second right crossing tube crossed with and hinged to each other. The chair frame further includes two backrest tubes, two armrest tubes and two armrest support tubes, lower ends of the two backrest tubes are respectively hinged to the first left crossing tube and the first right crossing tube, two backrest sliders are respectively sleeved on middle portions of the two backrest tubes, and the two backrest sliders are respectively hinged to the second left crossing tube and the second right crossing tube, and one end of each armrest tube is hinged to a respective backrest tube.