Chair Back Angle Adjustment Structure With Integrated Toothed Positioning
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Solution Overview
Problem
Conventional angle adjusting structures for chair backs are inconvenient to assemble and costly due to their multi-part design, which increases production costs and installation space requirements.
Innovation Solution
A multi-section angle adjusting structure featuring a supporting member connected to a base via a shaft with a slidable bar and toothed components, utilizing springs and a guiding line to micro-adjust the chair back's angle by engaging a toothed block with a toothed seat, allowing for ergonomic and adjustable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional angle adjusting structure uses multiple parts for positioning, then the positioning function is achieved, but the production cost increases and installation space increases
Solution Approach 1:
The patent combines multiple positioning parts into a single integrated positioning element. The positioning element incorporates both the positioning pin and the locking mechanism within one component, eliminating the need for separate parts. This merging reduces the number of components while maintaining the positioning function, thereby lowering production costs and installation space requirements.
Solution Approach 2:
The positioning element is designed to perform multiple functions simultaneously: it provides positioning, locking, and adjustment capabilities in a single component. The element can engage with different positions on the support member while also securing the armrest to the seat back, making it a multi-functional component that replaces several specialized parts.
2Reliability
If a conventional angle adjusting structure uses multiple parts for positioning, then the positioning function is achieved, but the installation space increases
Solution Approach 1:
The patent combines multiple positioning parts into a single integrated positioning element. The positioning element incorporates both the positioning pin and the locking mechanism within one component, eliminating the need for separate parts. This merging reduces the number of components while maintaining the positioning function, thereby lowering production costs and installation space requirements.
Solution Approach 2:
The positioning element is designed with nested components where smaller elements are housed within larger ones. The positioning pin is nested within the locking mechanism housing, and the spring is nested within the same structure. This nesting arrangement minimizes the overall space occupied by the positioning system while maintaining all necessary functions.
3Reliability
If a conventional angle adjusting structure uses two or more parts for positioning, then the positioning function is achieved, but the assembly convenience decreases
Solution Approach 1:
The patent combines multiple positioning parts into a single integrated positioning element. The positioning element incorporates both the positioning pin and the locking mechanism within one component, eliminating the need for separate parts. This merging reduces the number of components while maintaining the positioning function, thereby lowering production costs and installation space requirements.
Solution Approach 2:
The positioning element is pre-assembled with the spring and locking mechanism integrated into a single unit before installation. This preliminary assembly ensures proper alignment and pre-tensioning of the spring, eliminating the need for complex assembly steps during installation. The pre-assembled unit can be installed as a single component, significantly improving assembly convenience.
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 efficient and ergonomic adjustment of the chair back's angle with reduced complexity and cost, allowing users to select from multiple positions for optimal comfort, while maintaining the chair back's stability and ease of assembly.
Implementation Method 1
a first spring which contacts with a stop plate so that the toothed block abuts against an end portion of the slidable bar
Implementation Method 2
a second spring so that the tooth-shaped surface of the toothed seat is pushed by the second spring to engage with the toothed block
Data Source
AI summary
A multi-section angle adjusting structure for a chair back contains a supporting member axially connected to a base and axially inserted to a sliding groove through a shaft to slide in the sliding groove so that the chair back fixed to the supporting member is adjusted to a desired angle relative to the base. The shaft includes a slidable bar fitted thereon to be connected to a slot of the base. Another end of the slot pushes a toothed block biased against by a first spring which contacts with a stop plate so that the toothed block abuts against an end portion of the slidable bar. The slot includes a positioning structure mounted therein, and the positioning structure includes a toothed seat guided by a guiding line to engage with the toothed block.