Motorized Headrest Sliding Linkage for Precise Quiet Positioning
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Solution Overview
Problem
Existing headrest sliding mechanisms suffer from inaccuracies and noise due to excessive gaps between X-shaped links during rotation, leading to suboptimal adjustment of headrest positions and potential discomfort for occupants.
Innovation Solution
An electric headrest sliding device featuring a slider linearly movable up and down by a motor, a front frame, and a rotation link connecting the slider to the front frame. The rotation link rotates forward or backward to push or pull the front frame, enabling precise adjustment of the headrest's front and rear positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an X-shaped link mechanism is used to adjust headrest position, then the headrest can be moved forward and rearward, but excessive gaps between links occur during rotation causing positioning errors and noise
Solution Approach 1:
The patent extracts and eliminates the problematic X-shaped link mechanism that creates excessive gaps during rotation. By removing this mechanism, the invention avoids the positioning errors and noise that occur when the links rotate, while still achieving headrest position adjustment through an alternative linear sliding mechanism.
Solution Approach 2:
The patent replaces the traditional X-shaped link mechanical system with a linear sliding mechanism consisting of a motor, lead screw, and slider. This substitution eliminates the rotational gap issues inherent in link mechanisms while providing precise control over headrest position through linear motion.
2Adaptability or versatility
If the headrest angle is adjusted to accommodate occupant position, then the headrest can adapt to different seating positions, but the contact area between occupant's head and headrest is reduced causing discomfort and insufficient support
Solution Approach 1:
The patent introduces dynamic position adjustment capability to the headrest through the motor-driven linear sliding mechanism. This allows the headrest to dynamically change its forward-rearward position to match the occupant's head location, maintaining optimal contact area and support while adapting to different seating positions.
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
This solution allows for stable and accurate adjustment of the headrest's position, ensuring complete support for the occupant's head and reducing the risk of injury during collisions, while minimizing noise and errors.
Implementation Method 1
a lead screw connected to an output part of the motor, a slider coupled to the lead screw and disposed in front of the rear frame to be movable upwards and downwards
Data Source
AI summary
An electric headrest sliding device includes a slider configured to be movable upwards and downwards by driving of a motor, a front frame of a headrest, and a rotation link configured to connect the slider to the front frame, wherein the rotation link is rotated forwards or rearwards to push or pull the front frame during upward-and-downward movement of the slider, thereby accurately adjusting the front and rear positions of the headrest.