Vehicle Headrest Spring Adjustment Mechanism
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Solution Overview
Problem
Existing passenger vehicle headrests are overly complex, requiring significant passenger and staff interaction for adjustments, which often goes unused due to space and time constraints, compromising safety when not returned to a secure position during events like landing.
Innovation Solution
A self-adjusting passenger vehicle headrest assembly with a rail system and over-centering compression springs that maintains positions without additional securing mechanisms, allowing vertical movement and secure locking in raised or lowered positions with minimal intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the headrest is made adjustable with multiple positions for passenger comfort, then passenger comfort is improved, but the device complexity increases and requires more interaction from passengers and staff
Solution Approach 1:
The headrest assembly uses compression springs to automatically maintain the headrest in selected positions without requiring additional securing mechanisms or intervention from passengers or staff. The springs provide self-servicing by automatically counterbalancing the headrest weight and maintaining position stability.
Solution Approach 2:
The patent removes complex locking mechanisms, bolts, and additional securing devices from the headrest assembly. Only essential components (compression springs, guides, rollers) are retained, extracting unnecessary complexity while preserving adjustability functionality.
2Adaptability or versatility
If the headrest provides extensive adjustability options, then passenger comfort is improved, but the ease of operation deteriorates due to increased interaction requirements
Solution Approach 1:
The compression springs automatically maintain the headrest in selected positions without requiring passengers or staff to perform additional securing actions. The system serves itself by using spring force to counterbalance the headrest weight and maintain position stability.
Solution Approach 2:
Instead of requiring active engagement to lock the headrest in position, the system uses passive spring force to maintain position. The operation is inverted from active securing to passive maintaining, reducing user effort.
3Adaptability or versatility
If the headrest is made adjustable with multiple mechanisms, then passenger comfort is improved, but reliability deteriorates when positions are not securely maintained
Solution Approach 1:
The compression springs continuously exert force to maintain the headrest in selected positions, providing reliable position maintenance without requiring additional securing mechanisms. The springs automatically compensate for position changes and maintain stability.
Solution Approach 2:
The compression springs are pre-loaded to provide cushioning force before any position instability occurs. This beforehand cushioning ensures the headrest remains securely maintained in selected positions, preventing unintended movement during critical events.
4Adaptability or versatility
If the headrest assembly includes multiple adjustment mechanisms, then adaptability is improved, but the burden on passenger vehicle staff increases
Solution Approach 1:
The headrest assembly requires no staff intervention for position maintenance. The compression springs automatically maintain the headrest in selected positions, eliminating the burden on staff to secure or adjust the headrest during critical events such as departure and landing.
Solution Approach 2:
The patent removes the need for staff to perform securing actions by extracting complex locking mechanisms and additional securing devices. Only simple adjustment movement is required, significantly reducing staff burden.
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 reduces complexity and maintains the headrest in desired positions without passenger or staff intervention, enhancing safety and comfort by simplifying adjustments and ensuring the headrest is secure during critical events.
Implementation Method 1
The adjustment mechanism may be an over-centering linkage. The adjustment mechanism may comprise an opposing pair of compression springs. Each compression spring of the opposing pair of compression springs may be secured between the cover plate and the rail assembly.
Implementation Method 2
The opposing pair of compression springs are constantly driven from a parallel orientation relative one another into either the raised position and the lowered position where the opposing pair of compression springs are not in the parallel orientation.
Data Source
AI summary
The present disclosure relates to headrest assemblies for passenger vehicles. More specifically, the present disclosure describes a headrest assembly that provides adjustment between a raised position and a lowered position by way of a pair of compression springs or an over-centering linkage. Also provided herein is a method for using the same.