Vehicle Headrest Guide Locking for Simple One-Rod Adjustment
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Solution Overview
Problem
Existing headrests with mechanical adjustment mechanisms require numerous components, leading to complex assembly and high manufacturing costs, while ensuring easy and quick adjustability for different vehicle occupants.
Innovation Solution
A headrest guide arrangement with a manually operable locking mechanism that acts on only one of two headrest rods, utilizing a pretensioning element and a pushbutton for easy adjustment, and incorporates guide sleeve bodies with tolerance compensation to accommodate varying distances and diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical adjustment mechanism with gear components is used, then the headrest can be adjusted to different positions, but the number of components increases and assembly complexity increases
Solution Approach 1:
The patent extracts and eliminates the gear components from the adjustment mechanism, retaining only the essential elements (headrest rod, receptacle, locking mechanism) needed for position adjustment. This reduces the number of components while maintaining the core adjustment functionality.
Solution Approach 2:
Instead of using a complex gear-based mechanical transmission system to achieve adjustment, the patent inverts the approach by using a simple rod-receptacle interface with a locking mechanism, where the adjustment is achieved through direct insertion and locking rather than through mechanical gear transmission.
2Adaptability or versatility
If a mechanical adjustment mechanism with gear components is used, then the headrest can be adjusted to different positions, but assembly work and manufacturing expense increase
Solution Approach 1:
By removing the gear components from the design, the patent significantly reduces the assembly work required. The simplified structure consisting of the headrest rod, receptacle, and locking mechanism can be assembled with fewer steps and less precision requirements compared to a gear-based system.
Solution Approach 2:
The inverted design approach eliminates complex mechanical transmissions, resulting in a structure that is easier to manufacture and assemble. The direct rod-receptacle interface with locking mechanism requires simpler manufacturing processes and less skilled assembly work.
3Stability of the object's composition
If a locking mechanism acts on both headrest rods, then stability is improved, but the ease of operation decreases
Solution Approach 1:
The patent combines the locking actions on both headrest rods into a single integrated locking mechanism. By actuating one locking mechanism, both rods are locked simultaneously, maintaining stability while simplifying operation to a single action rather than requiring separate locking operations for each rod.
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
Facilitates quick, easy, and cost-effective adjustment of headrests to optimal positions for vehicle occupants, reducing assembly complexity and manufacturing costs.
Implementation Method 1
a pretensioning element (6) which pretensions the locking mechanism (3) into its first state
Data Source
AI summary
The disclosure relates to a headrest for a vehicle seat that includes two rods positioned roughly parallel to each other, which support or can support a head cushion. The headrest also includes a locking mechanism, typically operated by hand, that locks onto only one of the two rods or a section of one rod. This lock features a push button which, when pressed, releases the connection between the locking element and the rod, allowing for adjustment or removal.