Headrest Fore-Aft Adjuster Locking Mechanism
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Solution Overview
Problem
Conventional headrest fore-aft position adjusters are complex and heavy due to the use of large and numerous processed parts, which complicates the structure and increases weight.
Innovation Solution
A headrest fore-aft position adjuster featuring a displaceable body that receives a load and displaces in the fore-aft direction, integrated with a lock mechanism that includes an engaging part and engaged parts along a trajectory, allowing for locking and unlocking at multiple positions without requiring a long shaft, thereby simplifying and lightening the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional fore-aft position adjuster design is used with long shaft and large frame parts, then the headrest can be adjusted in fore-aft direction, but the structure becomes complex and weight increases
Solution Approach 1:
The adjuster is divided into separate functional modules: a displaceable body for fore-aft movement, a lock mechanism with engaging parts for position locking, and a headrest pillar. This segmentation allows each component to perform its specific function with simplified design, avoiding the need for a single complex assembly with long shafts and large frames.
Solution Approach 2:
The invention extracts and eliminates unnecessary components from conventional designs, specifically removing the long shaft and large frame parts that do not contribute to the core functionality. The essential functions of displacement and locking are achieved with minimal components, reducing overall structural complexity.
2Ease of operation
If conventional fore-aft position adjuster design is used with many processed parts with holes and grooves, then the headrest can be adjusted in fore-aft direction, but the weight increases
Solution Approach 1:
By segmenting the adjuster into discrete functional elements (displaceable body, lock mechanism, engaging parts), each component can be optimized for minimal weight while maintaining its specific function. This avoids the need for heavy, over-engineered single-piece constructions with multiple processed features.
Solution Approach 2:
The invention removes unnecessary processed parts, holes, and grooves that add weight without contributing to the core adjustment function. The simplified design uses only the essential components needed for displacement and locking, significantly reducing the overall weight of the moving adjuster assembly.
3Ease of operation
If conventional fore-aft position adjuster design is used with long shaft and large frame, then the headrest can be adjusted in fore-aft direction, but the overall size increases
Solution Approach 1:
Segmenting the adjuster into compact modular components allows for space-efficient arrangement. The displaceable body, lock mechanism, and engaging parts can be positioned closely together, minimizing the overall volume occupied by the adjuster assembly while maintaining full fore-aft adjustment capability.
Solution Approach 2:
The invention extracts and eliminates the long shaft and large frame components that occupy excessive space. The essential adjustment function is achieved with compact components that minimize the volume of the moving object, allowing the headrest system to maintain a compact overall size.
Data Source
AI summary
Disclosed is a headrest fore-aft position adjuster including a displaceable body which receives load of an occupant's head and which displaces in a fore-aft direction with respect to a headrest pillar and a lock mechanism which locks and unlocks the displaceable body at a plurality of positions along the fore-aft direction, and the lock mechanism includes an engaging part which displaces in the fore-aft direction integrally with the displaceable body, a plurality of engaged part which is provided along a trajectory of the engaging part and which the engaging part is engaged with in a locked state and the engaging part is configured to engage with the engaged parts from a lateral position.