Vehicle Headrest Bracket Locking Mechanism
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Solution Overview
Problem
Existing locking mechanisms for vehicle seat headrests allow both ordinary users and experts to inadvertently lower the headrest during accidents and enable easy dismounting, leading to safety concerns and asymmetric seat designs that hinder aesthetics and one-hand operation.
Innovation Solution
A bracket system with a spring element and actuation arm that engages notches on a carrier bar to securely lock the headrest in place, allowing one-hand operation and preventing accidental lowering or dismounting by ordinary users, while enabling easy disassembly by experts through a blocked second direction actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is provided to prevent accidental lowering of the headrest during accidents, then safety is improved, but the headrest becomes difficult to dismount for ordinary users
Solution Approach 1:
The locking mechanism is segmented into two independent locking directions: one for preventing accidental lowering (safety function) and another for controlled dismounting (service function). The actuation arm can independently engage or disengage each locking direction through different actuation methods, allowing safety locking in one direction while maintaining ease of service in the other direction.
2Reliability
If locking devices are arranged at both carrier bars to enable secure locking, then safety is improved, but the device complexity increases and asymmetric seat design limits aesthetics
Solution Approach 1:
The locking devices on both carrier bars are merged into a single actuation system. One actuation arm controls both locking directions simultaneously, allowing the headrest to be locked in both directions with a single action. This reduces device complexity and enables symmetric seat design while maintaining safety.
3Ease of operation
If a single release action is used for both locking directions, then ease of operation is improved, but security is reduced as ordinary users can easily dismount the headrest
Solution Approach 1:
Different actuation methods are assigned to different locking directions based on local quality requirements. The lowering direction (safety-critical) requires a simple push-button actuation for ease of operation during normal adjustment, while the dismounting direction (security-critical) requires a more complex actuation method that prevents inadvertent activation by ordinary users.
4Reliability
If the headrest is made secure against dismounting by ordinary users, then safety is improved, but ease of repair and maintenance deteriorates
Solution Approach 1:
An intermediary mechanism is introduced between the actuation arm and the locking notches for the dismounting direction. This intermediary requires a specific disassembly action (such as removing a cover or pressing a hidden release) to enable the actuation arm to move in the dismounting direction, thereby preventing ordinary users from dismounting the headrest while allowing experts to do so easily for repair and maintenance.
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
Ensures secure locking of the headrest during accidents, prevents easy dismounting by ordinary users, and allows for easy expert disassembly, while maintaining a symmetric design for improved aesthetics and functionality.
Implementation Method 1
a spring element with a first and a second portion... the first portion of the spring element is able to engage a notch of a first kind in said carrier bar in order to lock a longitudinal movement of the carrier bar in one direction, and the second portion of the spring element is able to engage a notch of a second kind in said carrier bar in order to lock a longitudinal movement of the carrier bar in the other direction
Data Source
AI summary
The present invention relates to a bracket system (1) adapted for use in a raising and lowering mechanism of an adjustable headrest (4) of a vehicle seat. The inventive bracket system (1) adapted for use in a raising and lowering mechanism of an adjustable headrest (4) of a vehicle seat comprises a spring element (8) an actuation arm (7) a longitudinal carrier bar (2) carrying the head rest (4) and having on its surface at least one notch of a first kind (9) and at least one notch of a second kind (10).