Chair Armrest Height Adjustment With Resilient Ring Latch
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Solution Overview
Problem
Existing chair armrests have complex structures and high material and assembly costs due to numerous parts, making them costly and difficult to assemble.
Innovation Solution
A simplified armrest design featuring a lower bushing with a toothed rack hole, an upper bushing with a through hole, and a resilient ring-shaped part with an H-shaped latching portion that allows for easy height adjustment using a button mechanism, reducing the number of parts and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional adjusting means are employed in armrests to enable height adjustment, then the armrest can be adjusted to different heights, but the structure becomes complicated and the number of parts increases, leading to high material and assembly costs
Solution Approach 1:
The patent combines multiple functions into a single integrated structure. The resilient ring-shaped part serves as both the adjusting mechanism and the locking mechanism, eliminating the need for separate adjusting means and reducing structural complexity while maintaining height adjustment capability
Solution Approach 2:
The resilient ring-shaped part performs multiple functions: it acts as a spring for adjustment, provides latching engagement with the toothed rack, and enables height positioning. This multi-functional component replaces what would traditionally require multiple separate parts, reducing overall device complexity
2Adaptability or versatility
If traditional adjusting means with numerous parts are used, then height adjustment is possible, but the material cost and assembling cost become too high
Solution Approach 1:
By merging the adjusting mechanism and locking mechanism into the single resilient ring-shaped part, the patent reduces the number of parts that need to be manufactured and assembled, directly lowering material costs and assembly costs while preserving height adjustment functionality
Solution Approach 2:
The resilient ring-shaped part is self-actuating through button pressure, automatically engaging and disengaging from the toothed rack without requiring external actuators or complex control systems, simplifying manufacturing and assembly processes
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
The design achieves a cost-effective and easy-to-assemble armrest with improved structural strength and convenience, allowing for precise height adjustment while maintaining material efficiency.
Implementation Method 1
a resilient ring shaped part received in the lower bushing... An H shaped latching portion is formed on the button and engages with the teeth of the lower bushing
Data Source
AI summary
An armrest for a chair includes a lower bushing, an upper bushing, and a resilient ring shaped part received in the lower bushing. An engaging portion is formed on an end of the lower bushing, and a side surface of the lower bushing defines a toothed rack hole, a plurality of teeth are formed at two opposite sides of the toothed rack hole. The upper bushing nests the lower bushing therein and defines a through hole corresponding to the toothed rack hole. A supporting is formed on an end of the upper bushing differing from the end of the upper bushing adjacent to the engaging portion. A button opposite to the through hole in the upper bushing is formed on the resilient ring shaped part and protrudes to an outer of the upper bushing from the toothed rack hole and the through hole. An H shaped latching portion is formed on the button and engages with the teeth of the lower bushing.