Chair assembly
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Solution Overview
Problem
Existing chair assemblies lack a comprehensive mechanism for smooth and adjustable reclining and vertical positioning, compromising user comfort and support.
Innovation Solution
A chair assembly design featuring a base structure with a seat and back support system connected via quick connect assemblies, allowing for recline and vertical adjustment through a four-bar linkage mechanism, with control links and spring assemblies for optimal lumbar support and tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional fixed chair structure is used, then manufacturing is simple, but user comfort and ergonomic support are compromised
Solution Approach 1:
The chair structure is transformed from a fixed static design to a dynamic adjustable system. The seat support structure and back support structure can pivot and adjust to multiple positions, allowing the chair to adapt to different user postures and comfort requirements. The four-bar linkage mechanism enables smooth transitions between upright and reclined positions while maintaining structural integrity.
Solution Approach 2:
The chair is divided into multiple independently adjustable segments: the seat support structure with forward and rearward portions, the back support structure with upper and lower portions, and the arm support structure. Each segment can be adjusted independently through quick connect assemblies, allowing customized positioning for optimal ergonomics without requiring complete structural redesign.
2Adaptability or versatility
If multiple adjustment mechanisms are added for recline and vertical positioning, then user comfort improves, but device complexity increases
Solution Approach 1:
The four-bar linkage mechanism serves multiple functions simultaneously: it controls recline motion, maintains structural stability, and enables smooth transitions between positions. The quick connect assemblies provide both structural connection and adjustment capability. This multi-functionality reduces the need for separate dedicated mechanisms for each adjustment function, thereby managing complexity while enhancing adaptability.
Solution Approach 2:
The control link acts as an intermediary element that coordinates the motion between the seat support structure and back support structure. By using this intermediate component, the system achieves synchronized adjustment of multiple parts through a single user action, reducing the complexity that would otherwise require multiple independent control mechanisms.
3Ease of manufacture
If quick connect assemblies are used for modular connection, then ease of assembly improves, but connection strength may be compromised
Solution Approach 1:
The quick connect assemblies incorporate locking mechanisms that transition from a loose state during assembly to a locked secure state during use. The connections are designed to be easily engaged and disengaged during manufacturing and assembly, but once connected, they provide sufficient strength to support the dynamic loads and forces generated during chair operation and adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables seamless reclining and vertical adjustment, enhancing user comfort by providing tailored support and maintaining ergonomic alignment, while allowing for customizable tension settings.
Implementation Method 1
a spring assembly operably coupled to the back support structure and configured to provide resilient support for the back support structure
Implementation Method 2
a four-bar linkage mechanism, with control links
Data Source
AI summary
A chair assembly includes a base structure defining upper and lower portions, and a support structure, a seat support structure having a forward portion pivotably connected to the upper portion of the base structure for rotation about a first pivot point and a rearward portion, a back support structure having a forward portion pivotably connected to the lower portion of the base structure for rotation about a second pivot point that is located below and rearward of the first pivot point, and an upwardly extending back portion that moves rearwardly and downwardly as the back support structure pivots and the back portion moves, and a control link pivotably coupled to the seat support structure for rotation about a third pivot point and to the back support structure for rotation about a fourth pivot point each located rearward of the first and second pivot points.