Foldable Vehicle Headrest Locking Mechanism for Minimal Seat Clearance
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Solution Overview
Problem
Existing foldable vehicle seats are limited by the space required for the headrest when folding, which interferes with forward seats, necessitating removal of the headrest or excessive clearance.
Innovation Solution
A foldable headrest system with a frame and rotating plate mechanism that allows the headrest to fold without removing it, using torsion springs and lock levers to minimize space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headrest is left in place during seat folding, then the headrest provides continuous support and protection, but it requires substantial clearance space that interferes with forward seats
Solution Approach 1:
The headrest is transformed from a static component to a dynamic one that can change position. The folding mechanism allows the headrest to rotate between an upright position (providing support) and a folded position (clearing space), enabling the system to adapt to different operational requirements without compromising either support continuity or space efficiency
Solution Approach 2:
The headrest assembly is divided into separable components including the headrest cushion, frame, rotating plate, and locking mechanism. This segmentation allows the headrest to be folded independently from the seat back, enabling compact storage while maintaining the integrity and support function of each component
2Area of stationary object
If the headrest is removed to facilitate folding, then clearance space is reduced, but the headrest support function is compromised
Solution Approach 1:
Rather than removing the headrest, the system makes it dynamic by incorporating a folding mechanism. The headrest can remain installed on the seat and provide support when needed, then fold away when space is required, eliminating the need to compromise between support function and clearance space
Solution Approach 2:
The headrest assembly is designed to perform multiple functions: providing head support when upright, folding to clear space when needed, and locking securely in both positions. This multi-functionality eliminates the need to choose between maintaining support and reducing clearance space
3Area of stationary object
If a foldable headrest mechanism is implemented, then clearance space is minimized, but the device complexity increases
Solution Approach 1:
The folding mechanism uses a nested arrangement where the headrest frame rotates on a rotating plate that is mounted on the seat back. The locking mechanism integrates into this nested structure, allowing compact storage of the folding components within the headrest assembly itself, minimizing additional space requirements while enabling the folding function
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
Enables seat folding with minimal clearance, allowing for improved cargo space utilization and accessibility by eliminating interference with forward seats.
Implementation Method 1
A torsion spring engages the lock lever to urge the lock lever toward the rotating plate
Implementation Method 2
a spring urges the headrest assembly toward a folded position
Data Source
AI summary
A foldable headrest for a vehicle seat includes a headrest assembly including a headrest and a frame with a section. A housing has a pair of side plates, each with a with a groove, and the section of the frame extends through the grooves. A rotating plate is engageable with the section of the frame. A lock lever is engageable with the rotating plate to hold the rotating plate and the headrest in position. A link/cable is connected with the lock lever to move the lock lever to allow the rotating plate and the headrest assembly to rotate.