Vehicle Headrest Synchronization Mechanism for Stable Comfort Adjustment
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Solution Overview
Problem
Existing headrests for vehicle seats require actuation of control elements, such as push buttons, which compromises safety and comfort, particularly during traffic situations and over the long service life of the product.
Innovation Solution
A headrest with a comfort adjustment device featuring two synchronized control elements that can be set in locked or unlocked positions, allowing for robust and intuitive adjustment of the upholstery part relative to the base body, with increased stability and usability, utilizing a synchronization rod for synchronized operation and enhanced adjustability through pivoting movement about a horizontal axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control element is used for comfort adjustment, then the device complexity is reduced, but the stability and reliability of the headrest adjustment deteriorates
Solution Approach 1:
The patent combines two control elements into a unified adjustment mechanism where both controls work together to adjust the upholstery part. The synchronization rod merges the operation of both control elements, ensuring they move simultaneously and maintain consistent positioning, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The control mechanism is segmented into two independent but synchronized control elements, each capable of individual operation. This segmentation allows for redundant control paths, where if one control element fails or becomes difficult to operate, the other can still function, thereby improving reliability while maintaining manageable complexity.
2Adaptability or versatility
If control elements are added for comfort adjustment, then the functionality and comfort options are improved, but the safety deteriorates due to driver distraction
Solution Approach 1:
The control elements are extracted from the driver's direct line of sight and control area, positioning them on the headrest structure itself. This allows the driver to adjust comfort settings with minimal attention, reducing distraction while maintaining full functionality. The controls are integrated into the headrest assembly rather than being separate dashboard controls.
Solution Approach 2:
The headrest adjustment system is designed for self-service operation by the passenger or driver without requiring complex sequences or multiple steps. The synchronized control elements provide intuitive, direct control over upholstery position, enabling quick adjustments with minimal cognitive load and reduced distraction risk.
3Adaptability or versatility
If the upholstery part is made adjustable for comfort, then the comfort and utility value are improved, but the device complexity increases
Solution Approach 1:
The control elements serve multiple functions: they control the adjustment of the upholstery part, provide tactile feedback for positioning, and can potentially indicate the current adjustment state. This multi-functionality reduces the need for separate components for each function, thereby providing comprehensive adjustability without proportionally increasing complexity.
Solution Approach 2:
The synchronization rod acts as an intermediary mechanism that translates the operation of control elements into coordinated movement of the upholstery part. This intermediary component simplifies the overall system by providing a mechanical linkage that automatically coordinates the adjustment action, reducing the need for complex electronic controls or multiple independent mechanisms.
4Reliability
If two control elements are used instead of one, then the stability and reliability are improved, but the device complexity increases
Solution Approach 1:
The two control elements are merged through the synchronization rod mechanism, which ensures they operate in unison. This merging approach provides the reliability benefits of having two controls (redundancy, distributed loading) while maintaining the simplicity of a coordinated, unified adjustment action, thereby minimizing the increase in overall device complexity.
Data Source
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AI summary
A headrest for a vehicle seat, in particular for a motor vehicle seat, is proposed, the headrest comprising a padded part facing the head of a seat occupant, a basic part and a comfort-adjustment device. When the headrest is in use, the padded part can be adjusted by means of the comfort-adjustment device relative to the basic part from a first position, in which it is further away from the head of the seat occupant, into a second position, closer to the head of the seat occupant. The comfort-adjustment device has two control elements which can be set in a locking position and in an unlocking position, the movement of the control elements being synchronized.