Headrest X Linkage with Front-Rear Locking for Position Adjustability
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Solution Overview
Problem
The existing headrests cannot be shifted to desired positions in the front-rear direction in a normal mode, limiting comfort and adjustability.
Innovation Solution
A headrest design featuring first and second headrest pillars, a stationary unit, a movable unit, an X linkage, and a front-rear locking mechanism with integrated lock receivers and locking components, allowing the movable unit to adjustably move relative to the stationary unit in the front-rear direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the headrest uses an X linkage mechanism for rear-end collision protection, then the strength and safety are improved, but the ability to adjust to multiple positions in normal mode is lost
Solution Approach 1:
The headrest incorporates a dynamic locking mechanism that allows the movable unit to be locked at multiple positions during normal operation, while maintaining the X linkage's collision response capability. The locking mechanism transitions between locked and unlocked states based on operational mode, enabling both adjustability and safety functionality.
Solution Approach 2:
The headrest design integrates multiple functions into a single system: the X linkage provides both collision protection and position adjustment capability, while the locking mechanism enables both fixed positioning and movement functionality. This multi-functional design resolves the contradiction between safety and adaptability.
2Adaptability or versatility
If the headrest allows continuous movement for position adjustment, then the comfort and adaptability are improved, but the structural stability and locking reliability deteriorate
Solution Approach 1:
The headrest position adjustment is segmented into discrete locked positions rather than continuous movement. The locking mechanism divides the movement range into specific stop positions, ensuring structural stability at each position while still providing multiple adjustable locations for user comfort.
Solution Approach 2:
The locking mechanism is designed to automatically engage and disengage at specific positions during movement, providing self-locking functionality without requiring additional control systems. This ensures reliable locking at each position while maintaining ease of adjustment.
3Stability of the object's composition
If the headrest includes a locking mechanism for position fixation, then the position stability is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the existing X linkage structure, utilizing the same mechanical components for both collision response and position locking functions. This integration reduces overall device complexity while maintaining position stability, as the locking feature is added to the existing framework rather than being a separate system.
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
Enables high seating comfort by allowing the movable unit to be shifted to multiple positions, providing balanced locking and unlocking operations, and facilitating a compact design.
Implementation Method 1
an X linkage connecting the stationary unit to the movable unit, the X linkage including an inside linkage segment and an outside linkage segment rotatably connected each other at a central connecting intersection
Implementation Method 2
a front-rear locking mechanism comprising at least one lock receiver and at least one lock engageable with the lock receiver, the locking mechanism being configured to lock or unlock the movable unit movable relative to the stationary unit toward the front or rear direction
Implementation Method 3
the lock receiver includes a ratchet mechanism having a plurality of teeth arranged on an arc line corresponding to rotation of the X linkage
Data Source
AI summary
A headrest is provided including a movable unit that can be shifted to multiple positions in the front-rear direction in a normal mode. A headrest includes first and second headrest pillars, a stationary unit disposed between the first and second headrest pillars, a movable unit movable apart from or close to the stationary unit toward a front or rear direction, an X linkage connecting the stationary unit to the movable unit and including an inside linkage segment and an outside linkage segment rotatably connected each other at a central connecting intersection, and a front-rear locking mechanism including a lock receiver and a locking component engageable with the lock receiver, to lock or unlock the movable unit movable relative to the stationary unit toward the front or rear direction.