Motorized Headrest Linkage for Fast Forward and Upward Support
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Solution Overview
Problem
Existing headrest moving devices in vehicles are inadequate in supporting the head of a passenger when it leans backwards, as they move the headrest backwards too late or not effectively.
Innovation Solution
A headrest moving device comprising an ejector casing, a tiltable member, a stay rod, a movable unit with a connector and mounting holder, and a motor that allows the headrest to be easily moved upwards and forwards, with a spring and stopper for maintaining a predetermined angle and facilitating assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hit plate is pushed backwards by impact force, then the headrest can be moved forwards quickly, but the headrest cannot effectively support the head when it leans backwards after the impact
Solution Approach 1:
The patent applies dynamics by making the headrest system movable and adjustable through a motor-driven screw mechanism. The connector can move up and down along the stay rod, and the mounting holder can rotate relative to the connector, enabling the headrest to dynamically adapt to different positions and maintain effective support for the passenger's head in various states, including when leaning backwards.
2Speed
If the spring contractile force is stronger than the striking force, then the hit plate returns quickly to original position, but the headrest moves backwards too late to support the head
Solution Approach 1:
The patent applies self-service through the spring mechanism that automatically returns the connector to its original position after being pushed forward during a collision. The spring is connected between the connector and mounting holder, and when the connector moves forward, the spring extends and stores energy, then automatically contracts to push the connector back, enabling the headrest to return to its support position without external intervention.
3Adaptability or versatility
If the central axis is inclined relative to the screw, then the mounting holder and tiltable member rotate when the connector moves upwards, but this adds mechanical complexity
Solution Approach 1:
The patent applies asymmetry by designing the central axis passing through the ejecting hole and insert hole to be inclined relative to the screw axis rather than parallel. This asymmetric arrangement causes the mounting holder and tiltable member to rotate when the connector moves up or down, enabling the headrest to adjust both its height and angle simultaneously, providing versatile position adjustment capability.
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 device ensures the headrest can be quickly moved upwards and forwards to support the passenger's head during collisions, reducing the risk of neck injuries and providing comfort by minimizing forward movement until a predetermined height is reached, thus preventing uncomfortable adjustments.
Implementation Method 1
a screw engaged with the connector in a screw manner of engagement; and a motor for rotating the screw
Implementation Method 2
a spring connected to the connector at a first end thereof and connected to the mounting holder at a second end thereof
Data Source
AI summary
The present invention relates to a headrest moving device. The headrest moving device includes an ejector casing mounted to a seat frame, a tiltable member tiltably installed in the ejector casing, a stay rod connected to a headrest and passing through the tiltable member, a movable unit having a connector and a mounting holder rotatably coupled to the connector and connected to the stay rod, a screw engaged with the connector in a screw manner of engagement, and a motor for rotating the screw, wherein the tiltable member can be tilted relative to the ejector casing and the mounting holder can be rotated relative to the connector, so that the headrest moving device can easily move the headrest forwards and upwards.