Vehicle Head Restraint Locking on One Rod for Easy Adjustment
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Solution Overview
Problem
Existing headrest arrangements for vehicle seats require complex mechanisms with numerous components, leading to high assembly costs and effort, while ensuring quick, easy, and optimal adjustment for different occupants.
Innovation Solution
A headrest design with two parallel headrest rods and a manual locking mechanism that acts on only one rod, featuring a pivot lever and pretensioning element for easy adjustment between locked and unlocked states, along with guide sleeves for tolerance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex adjustment mechanism with numerous components (e.g., gear components) is used, then the headrest can be adjusted to different positions, but the assembly work and manufacturing cost increase significantly
Solution Approach 1:
The headrest rod is divided into two separate rods (first and second headrest rods), each independently guided through separate guide sleeves. This segmentation allows each rod to be adjusted independently with its own simple locking mechanism, eliminating the need for a complex gear-based adjustment system while maintaining full adjustability functionality.
Solution Approach 2:
The invention extracts and eliminates the complex gear components from the adjustment mechanism. Instead of using gears for adjustment, the patent employs a direct locking mechanism that engages with notches on the headrest rods, removing unnecessary intermediate components and simplifying the overall structure.
2Adaptability or versatility
If a complex adjustment mechanism with numerous components is used, then the headrest can be adjusted to different positions, but the assembly effort and time increase
Solution Approach 1:
By segmenting the headrest into two independently adjustable rods with separate guide sleeves and locking mechanisms, the assembly process becomes more straightforward. Each component can be assembled and tested independently, reducing the complexity of overall assembly and enabling faster production line assembly compared to integrating complex gear mechanisms.
Solution Approach 2:
Removing the gear components eliminates the need for precise gear assembly and alignment procedures. The simplified locking mechanism with engagement elements and notches requires fewer assembly steps and less skilled labor, directly improving assembly productivity.
3Reliability
If a locking mechanism acts on both headrest rods, then both rods are secured, but the design becomes more complex
Solution Approach 1:
The locking function is segmented and distributed to individual locking mechanisms for each headrest rod. Each rod has its own engagement element that independently secures that specific rod, eliminating the need for a single complex locking mechanism that would need to control both rods simultaneously.
Solution Approach 2:
Each headrest rod is equipped with its own locking engagement element that automatically engages with the guide sleeve when the rod is positioned. The pretensioning element provides automatic pretensioning, allowing the system to self-regulate and secure each rod independently without requiring complex centralized control.
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 with reduced components, enhancing manufacturing simplicity and occupant comfort.
Implementation Method 1
the locking mechanism has a pretensioning element, in particular a compression spring, which pretensions the locking mechanism into its first state
Implementation Method 2
the locking mechanism has a pretensioning element, in particular a compression spring, which pretensions the locking mechanism into its first state
Data Source
AI summary
A headrest for a vehicle seat, wherein the headrest has two headrest rods which extend at least substantially parallel and on which a head cushion of the headrest is arranged or can be arranged. The headrest furthermore has a locking mechanism which can be actuated, in particular manually, and which in its locked state acts exclusively on only one of the two headrest rods, the locking mechanism having a pivot lever which is designed in such a way that when the pivot lever is actuated, engagement between an engagement element and the one headrest rod is released.