Adjustable Chair Lumbar Assembly With Secure Smooth Positioning
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Solution Overview
Problem
Existing lumbar support devices for chairs lack optimal comfort, ease of manufacturing, smooth adjustability, durability, and security in their adjusted positions, while providing effective lumbar support.
Innovation Solution
A vertically adjustable lumbar assembly with a flexible lumbar device and an overlap joint connection between the chair back support and lower frame, featuring a 'ZIP-LOCK' type bottom connection and wave ridges for smooth adjustment, ensuring secure positioning and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lumbar support device is made adjustable and comfortable, then user comfort is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The lumbar support device is divided into multiple wire segments arranged in a grid pattern, allowing independent adjustment of each section to provide customized lumbar support without requiring a complex overall structure
Solution Approach 2:
The device uses a dynamic adjustment mechanism where the basculating arm can pivot between multiple positions, enabling the wire array to transition between different support configurations while maintaining structural simplicity
2Reliability
If a lumbar support device provides secure positioning, then reliability is improved, but the adjustment smoothness and ease of operation deteriorate
Solution Approach 1:
The wave ridges on the guide channel are pre-configured to provide progressive resistance during adjustment, preventing overshot and ensuring the device settles securely at each position while maintaining smooth movement throughout the adjustment range
Solution Approach 2:
The guide channel acts as an intermediary mechanism between the basculating arm and the wire array, mediating the adjustment motion to provide both smooth movement and secure positioning through its shaped geometry
3Strength
If the chair back support uses a robust connection to the lower frame, then structural strength is improved, but the manufacturing and assembly complexity increase
Solution Approach 1:
The overlap joint combines the back support and lower frame into a single integrated connection structure, providing robust structural strength while simplifying manufacturing and assembly by eliminating the need for separate mounting operations
Solution Approach 2:
The overlap joint is designed to be pre-assembled during frame construction, with the back support overlapping the lower frame in a configuration that automatically provides structural reinforcement without requiring additional fastening steps
Data Source
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AI summary
A chair includes a lower back frame, a back construction, including a back support attached to the lower back frame, a cushion assembly attached to the back support, and a vertically adjustable lumbar. The lumbar frame includes a transition shell and a vertically sliding lumbar device having a plurality of horizontal flexible wires. A lower edge of the transition shell is positioned on top of an uppermost horizontal flexible wire of the lumbar device. The lumbar device is operably slidably mounted between the outer shell and cushion assembly and the transition shell upper edge slides between the outer shell and the upholstery cushion assembly. Another chair includes a Y-shaped lower back frame having two uprights and a cross-piece attached to the back support. An overlap flange and channel-shaped flange mate to form an overlap joint, including a box beam for added structural support.