Vehicle Headrest Adjustment with Synchronized Dual Locking Elements
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Solution Overview
Problem
Existing headrests for vehicle seats require actuation of operating elements for comfort adjustment, leading to reduced safety and convenience while driving, as they often lack robust and intuitive adjustment mechanisms.
Innovation Solution
A headrest with a comfort-adjustment device featuring two synchronized control elements that can be set in locking and unlocking positions, allowing for simple and robust adjustment of the padded part relative to the main body through a pivoting motion, with increased adjustment force at extreme positions and multiple latching positions, enabling one-handed operation and clear recognition of the last latching position.
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 adjustment mechanism deteriorates
Solution Approach 1:
The patent applies local quality by making the two control elements asymmetric in their engagement characteristics with the latching mechanism. One control element engages more deeply or with different timing than the other, creating localized differences in the adjustment sequence that enhance overall stability while maintaining simple control operation.
2Manufacturing precision
If operating elements are required for comfort adjustment, then the adjustment precision is improved, but the ease of operation deteriorates due to reduced safety and convenience
Solution Approach 1:
The headrest adjustment mechanism employs self-service principles where the control elements automatically engage with the latching mechanism through simple user input. The synchronized dual-control design provides inherent positioning accuracy without requiring complex operating procedures, allowing drivers to easily adjust the headrest while maintaining safety and convenience.
3Ease of operation
If the padded part can move freely in both directions, then the ease of operation is improved, but the reliability of position locking deteriorates
Solution Approach 1:
The patent implements dynamics by creating a latching mechanism that transitions between locked and unlocked states based on control element position. The system dynamically adjusts the degree of freedom of the padded part - fully constrained when locked, freely adjustable when unlocked - providing both stability and flexibility as needed during different phases of operation.
4Reliability
If adjustment force is increased at extreme positions, then the reliability of extreme position detection is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the increased adjustment force at extreme positions serves as tactile feedback to the user. This force resistance provides clear sensory feedback that an extreme position has been reached, improving position recognition reliability while the feedback itself becomes part of the intuitive operation rather than a separate difficulty.
Data Source
AI summary
A headrest for a vehicle seat, in particular for a motor vehicle seat, is proposed. The headrest includes 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 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.