Vehicle Seat Head Restraint Locking Mechanism
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Solution Overview
Problem
Existing adjustable head restraint assemblies for vehicle seats lack efficient mechanisms for secure height adjustment, often resulting in unwanted movement and noise due to inadequate locking systems, which compromises occupant comfort and safety.
Innovation Solution
A locking mechanism utilizing a single spring wire that engages both posts of the head restraint assembly, providing secure height adjustment and reducing component count, weight, and noise issues by eliminating the need for additional locking plates and return springs, while maintaining consistent force and predictable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking mechanisms with multiple components (locking plates and return springs) are used, then the head restraint assembly achieves height adjustment, but the device complexity increases and unwanted noise and movement occur
Solution Approach 1:
The patent combines multiple locking components (locking plates and return springs) into a single spring wire that performs both locking and return functions. The spring wire engages with notches on the posts to lock the head restraint at adjusted positions and automatically returns to engage the next notch when released, eliminating the need for separate locking plates and return springs.
Solution Approach 2:
The spring wire serves multiple functions simultaneously: it acts as both the locking mechanism (engaging with notches to secure positions) and the return mechanism (automatically returning to engage the next notch). This multi-functional design reduces component count while maintaining reliable height adjustment capability.
2Reliability
If multiple locking components are used, then the locking mechanism can engage posts, but the component count and weight increase
Solution Approach 1:
The patent merges multiple heavy components (locking plates and return springs) into a single lightweight spring wire that provides equivalent or superior locking security through its elastic deformation and engagement with notches on the posts.
Solution Approach 2:
The patent extracts and eliminates unnecessary components (locking plates and return springs) from the system, retaining only the essential spring wire that provides both locking and return functions, thereby reducing overall weight while maintaining security.
3Ease of operation
If traditional locking mechanisms are used, then height adjustment is achieved, but unwanted movement and noise occur
Solution Approach 1:
The spring wire design eliminates gaps and play between separate components (locking plates and posts) by providing continuous elastic engagement with the notches. This unified structure prevents unwanted movement and reduces noise and vibration during height adjustment operations.
Solution Approach 2:
The spring wire's elastic properties allow it to deform and conform to the notches on the posts, creating a tight fit that eliminates play and prevents unwanted movement. The material and geometric parameters of the spring wire are optimized to provide sufficient engagement force while minimizing noise and vibration.
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 solution ensures secure, adjustable head restraints with reduced noise and vibration, enhancing occupant comfort and safety by providing reliable height adjustment without unwanted movement or noise, and lowering production costs through reduced component complexity.
Implementation Method 1
A locking mechanism is provided that includes a single spring wire that is engageable with both of the posts
Implementation Method 2
A locking mechanism is provided that includes a single spring wire that is engageable with both of the posts
Data Source
AI summary
An adjustable head restraint assembly for a vehicle seat is provided with a post for supporting a head restraint for movement along the post. A biasing member is mounted to the head restraint and cooperates with the post for maintaining the head restraint at a locked position. A ramp is fixed to the head restraint within a path of movement of the biasing member. An actuation member is mounted to the head restraint and cooperates with the biasing member for urging the biasing member into engagement with the ramp and consequently out of engagement with the post for permitting movement of the head restraint along the post.