Chair assembly with upholstery covering
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Solution Overview
Problem
Current office chair designs lack adjustable features that provide optimal support and comfort for users, particularly in terms of armrest positioning and backrest adjustment, leading to inadequate ergonomic settings.
Innovation Solution
The chair assembly includes an adjustable arm assembly with an arm base extending at an acute angle, a support assembly for the armrest, and a control arrangement that allows the user to adjust the biasing force on the back assembly between different configurations, enabling customizable ergonomic settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed armrest positioning is used, then device complexity is reduced, but adaptability and user comfort deteriorate
Solution Approach 1:
The arm assembly is designed with adjustable components that allow dynamic repositioning. The arm base can be adjusted to different angles and positions, and the support assembly can be repositioned along the arm base, transforming a static structure into a dynamic one that adapts to user needs.
Solution Approach 2:
The arm assembly is divided into separate functional segments: an arm base portion, a support assembly portion, and an armrest portion. This segmentation allows each component to be independently adjusted and positioned, providing versatility without requiring complete redesign of the entire arm assembly.
2Adaptability or versatility
If fixed backrest support is used, then device complexity is reduced, but user comfort and ergonomic alignment deteriorate
Solution Approach 1:
The control assembly includes adjustable biasing mechanisms that allow the backrest support characteristics to be dynamically changed. Users can adjust the biasing force between different configurations, transforming a fixed support system into an adaptable one that responds to different user preferences and ergonomic requirements.
Solution Approach 2:
The biasing force parameter of the backrest support is made adjustable between different configurations. This allows the support characteristics to be modified without changing the fundamental structure, providing adaptability through parameter variation rather than structural complexity.
3Ease of operation
If adjustable armrest and backrest features are added, then user comfort and ergonomics improve, but device complexity increases
Solution Approach 1:
The chair assembly is divided into independently adjustable segments including the arm assembly with its own adjustment mechanisms and the back assembly with separate control features. This segmentation allows ergonomic adjustments without requiring complete system redesign, managing complexity through modular design.
Solution Approach 2:
The arm base serves multiple functions: it provides structural support, enables angular adjustment, and allows repositioning of the support assembly. This multi-functionality reduces the need for separate components, managing complexity while maintaining ergonomic adjustability.
Data Source
AI summary
A chair assembly includes an arm assembly that includes an armrest supported by a vertically adjustable support assembly and an arm base, where the arm base extends at an acute angle with respect to a longitudinal centerline of the chair assembly, an upholstery arrangement including a ring member attached to a cover, where the ring member includes a plurality of reliefs having a width that reduces as the ring member is wrapped about a shell member of the chair assembly, and a control arrangement having a biasing member that moves through an arcuate path as the biasing member is adjusted between varying bias settings.