Headrest Lifting Mechanism With Elastic Slot Positioning
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Solution Overview
Problem
Existing headrest lifting mechanisms for chairs are complex, difficult to assemble, and costly, hindering mass production and ergonomic comfort.
Innovation Solution
A headrest lifting mechanism comprising a lifting base with inclined, straight, and curved slots, and an elastic positioning rod, allowing for easy assembly and height adjustment of the headrest with fewer parts, reducing production costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex adjustable positioning mechanism with multiple members and channels is used, then positioning accuracy is improved, but device complexity increases and assembly difficulty increases
Solution Approach 1:
The patent extracts and eliminates the complex adjustable positioning mechanism (first member with channel, second member with rotatable cog) from the headrest lifting mechanism. Instead, it uses a simplified structure where the elastic positioning rod directly engages with fixed slots in the lifting base, achieving positioning without the complicated biasing-free adjustment mechanism.
Solution Approach 2:
Rather than using an active adjustment mechanism to achieve positioning, the patent inverts the approach by using passive elastic engagement. The elastic positioning rod naturally engages with the slots and stop points to provide positioning, eliminating the need for the complex bidirectional adjustment mechanism described in the prior art.
2Measurement precision
If a complex adjustable positioning mechanism is used, then positioning accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent removes the complex adjustable positioning mechanism entirely from the assembly process. The elastic positioning rod is simply inserted into the lifting base and automatically engages with the slots and stop points, making assembly trivial compared to the complex assembly of multiple members, channels, and rotatable cogs required by the prior art.
Solution Approach 2:
The elastic positioning rod performs self-positioning and self-locking by automatically engaging with the slots and stop points in the lifting base. This eliminates the need for complex manual adjustment and assembly operations required by the prior art mechanism.
3Measurement precision
If a complex adjustable positioning mechanism is used, then positioning accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the expensive adjustable positioning mechanism components (multiple members, channels, rotatable cogs, biasing members) from the design. The simplified structure with elastic positioning rod and fixed slots reduces part count and manufacturing complexity, lowering production costs while maintaining positioning functionality.
Solution Approach 2:
The patent merges the positioning function into the structural components themselves. The lifting base incorporates the slots and stop points directly into its structure, and the elastic positioning rod combines positioning and locking functions in a single component, eliminating the need for separate expensive adjustment mechanisms.
4Measurement precision
If a complex adjustable positioning mechanism is used, then positioning accuracy is improved, but productivity deteriorates
Solution Approach 1:
The patent removes the complex adjustable positioning mechanism that hinders mass production. The simplified elastic positioning rod and fixed slot design can be easily manufactured and assembled in large quantities, improving productivity compared to the complex mechanism requiring precise assembly of multiple components.
Solution Approach 2:
The patent segments the positioning function into simple, independent components (elastic positioning rod, slots, stop points) that can be manufactured separately and assembled quickly. This modular approach facilitates mass production compared to the integrated complex mechanism in the prior art.
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 mechanism simplifies assembly, reduces production costs, and facilitates mass production while providing adjustable headrest height for enhanced ergonomic comfort.
Implementation Method 1
a bottom end thereof forms a positioning end that is elastically located at the axis of the straight slide rail by material elasticity of the elastic positioning rod
Data Source
AI summary
A headrest lifting mechanism is revealed. The headrest lifting mechanism is disposed on a seat back and including a lifting base, a bottom-side vertical support and an elastic positioning rod. A headrest is connected to an upper end of the bottom-side vertical support. A positioning end of the elastic positioning rod fixed on the bottom-side vertical support is moved downward into one of the slots of the lifting base owing to material elasticity when the bottom-side vertical support is assembled with the lifting base. Thus the bottom-side vertical support and the positioning end are slid and positioned together in the slots of the lifting base. The number of the parts is reduced and the assembly is simplified. This enables cost reduction and mass production.