Vehicle Headrest Friction Hinge Assembly
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Solution Overview
Problem
Automotive headrests face a challenge in balancing strength, comfort, and cost-effectiveness, as improvements in one area often detract from others, and existing adjustment mechanisms are complex and costly to produce.
Innovation Solution
A headrest assembly with a housing featuring moveable side panels pivoting about vertical axes, connected by spring clips with cam portions that maintain angular positions without manual adjustment, allowing for adjustable support and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complicated adjustment mechanisms are used to provide positional comfort and adaptability, then headrest adaptability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The headrest employs a dynamic friction hinge mechanism that allows continuous angular adjustment of the headrest shell relative to the base. The friction hinge provides controllable resistance to rotation, enabling the headrest to be positioned at various angles while maintaining each position without complex locking mechanisms. This dynamic adjustment capability achieves adaptability while keeping the mechanism relatively simple.
Solution Approach 2:
The friction hinge mechanism changes the friction parameter dynamically to control the headrest position. By adjusting the friction force, the system allows easy movement of the headrest to different angular positions while maintaining each position stably. This parameter-based control simplifies the adjustment mechanism compared to traditional multi-component locking systems.
2Strength
If stronger materials and components are used to prevent whiplash and block foreign objects, then headrest strength improves, but weight increases
Solution Approach 1:
The headrest utilizes composite construction with a shell, base, and friction hinge mechanism that combines different materials to achieve optimal strength-to-weight ratio. The friction hinge itself acts as a structural component that provides both adjustment functionality and structural support, eliminating the need for additional heavy reinforcement elements.
Solution Approach 2:
The friction hinge mechanism serves multiple functions: it enables angular adjustment, provides structural support, and contributes to the overall strength of the headrest assembly. By making the hinge mechanism multi-functional, the design avoids adding separate components for each function, thereby controlling weight while maintaining strength.
3Ease of operation
If friction hinge mechanism is used to allow angular adjustment, then ease of operation improves, but manufacturing precision requirements increase
Solution Approach 1:
The friction hinge mechanism is designed to be self-adjusting and self-locking. The friction between the hinge components automatically provides the necessary resistance and positioning without requiring external control systems or high-precision adjustment mechanisms. The system serves itself by using friction to both enable movement and maintain position.
Solution Approach 2:
The friction hinge controls the headrest position by changing the friction parameter rather than relying on precise mechanical stops or locking points. This approach tolerates greater variations in manufacturing dimensions while still providing reliable positioning, as the friction force can compensate for minor dimensional inconsistencies.
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 provides enhanced positional comfort and strength while being cost-effective, with the ability to pivot side panels up to 180° for varied support, maintaining angular positions without manual adjustments and optimizing material usage.
Implementation Method 1
Each of the first spring clip and the second spring clip also includes a cam portion in contact with the respective pin to maintain an angular position of the first side panel and the second side panel relative to the central panel
Data Source
AI summary
A headrest assembly for use in a vehicle includes a housing having a front portion and a rear portion. The headrest assembly also includes an armature operatively coupling the rear portion to a seatback of an automobile seat. The front portion includes a central panel, a first side panel, and a second side panel, wherein the first side panel pivots relative to the central panel about a first vertical axis, and the second side panel pivots relative to the central panel about a second vertical axis. The headrest assembly also includes a first spring clip assembly connecting the first side panel to a side of the central panel and a second spring clip assembly connecting the second side panel to an opposite side of the central panel, the first and second spring clip assemblies maintaining an angular position of the first and second side panels absent manual adjustment.