Deformable Chair Shell With Central Pivot for Stable Movability
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Solution Overview
Problem
Existing chair designs with deformable seat shells and pivot joints are costly to produce and require multiple parts for movability, which increases complexity and cost.
Innovation Solution
A chair design featuring a deformable seat shell with pivot joints arranged in the sagittal plane, using a one-piece backrest support connected by a central pivot joint, and incorporating a bearing system to prevent sideways tipping while allowing deformation, reducing the number of parts and enhancing movability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pivot joints and struts are used to achieve movability, then the chair can deform and adapt to user movements, but the number of parts increases and production cost rises
Solution Approach 1:
The patent combines multiple pivot joints into a single integrated pivot joint at the front edge of the seat. This single joint performs the functions of multiple separate joints in the prior art, allowing the seat to pivot relative to the support while reducing the total number of parts. The integration maintains the necessary movability and adaptability while simplifying the overall structure.
Solution Approach 2:
The single pivot joint at the front edge of the seat serves multiple functions simultaneously: it allows pivoting motion, provides structural support, and enables the seat to adapt to user movements. This multi-functional design replaces what previously required multiple specialized components, reducing complexity while maintaining adaptability.
2Adaptability or versatility
If multiple pivot joints and struts are used to achieve movability, then the chair can deform and adapt to user movements, but production cost increases
Solution Approach 1:
By merging multiple pivot joints and struts into a single integrated pivot joint assembly, the patent reduces the number of components that need to be manufactured, assembled, and inventoried. This consolidation directly reduces production costs while maintaining the chair's ability to deform and adapt to user movements through the single joint's pivoting capability.
3Device complexity
If the second pivot joint is connected centrally to the backrest, then the number of parts is reduced and production is simplified, but the arrangement of pivot joints must be optimized
Solution Approach 1:
The patent employs asymmetric arrangement of the single pivot joint at the front edge of the seat, positioned specifically to optimize both structural support and pivoting functionality. This asymmetric placement, rather than a symmetric central position, allows the design to reduce part count while maintaining precise control over the chair's deformation characteristics and user comfort.
Data Source
AI summary
A chair includes a deformable seat shell forming a seat part and a backrest, and further includes a frame, the seat part being connected to the frame by means of a first pivot joint and the backrest being connected to the frame by means of a second pivot joint, the pivot joints allowing a twisting of the seat part and of the backrest relative to the frame caused by a deformation of the seat shell. The second pivot joint is connected to the backrest centrally in relation to the transverse direction of the chair.