Continuous Rod Head Restraint Assembly for Height Adjustment
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Solution Overview
Problem
Existing head restraint assemblies for vehicle seats are inefficient in terms of component usage, requiring separate posts and additional parts for height adjustment, which increases complexity, cost, and weight, while lacking adaptability for various seat designs.
Innovation Solution
An adjustable head restraint assembly utilizing a continuous rod with angled lower portions and a transverse frame that can be assembled over these posts, allowing for height adjustment with a minimal number of components and accommodating posts of varying diameters, thereby reducing parts and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate posts and additional parts are used for height adjustment, then the head restraint assembly can achieve height adjustment functionality, but the component count increases, increasing complexity, cost, and weight
Solution Approach 1:
The patent combines multiple separate posts into a single continuous rod structure that integrates the height adjustment functionality. The rod includes angled lower portions that directly engage with the seat structure, eliminating the need for separate posts and additional adjustment parts, thereby reducing component count while maintaining adjustability
Solution Approach 2:
The continuous rod serves multiple functions simultaneously: it provides structural support, enables height adjustment through its angled portions, and acts as a mounting element for the head restraint. This multi-functional design replaces several separate components with a single unitary structure
2Ease of operation
If separate posts and additional parts are used for height adjustment, then the head restraint assembly can achieve height adjustment functionality, but the weight increases
Solution Approach 1:
By merging multiple separate posts and adjustment parts into a single continuous rod, the patent reduces the total material used and eliminates redundant components, directly reducing the overall weight of the head restraint assembly while preserving height adjustment capability
3Ease of operation
If separate posts and additional parts are used for height adjustment, then the head restraint assembly can achieve height adjustment functionality, but the manufacturing cost increases
Solution Approach 1:
The continuous rod can be manufactured as a single piece using processes like extrusion or forming, eliminating the need to manufacture, inventory, and assemble multiple separate posts and adjustment components, thereby reducing manufacturing complexity and cost
Solution Approach 2:
The unitary rod structure serves multiple functions (support, adjustment, mounting) that would otherwise require separate components, reducing the total part count and associated manufacturing, inventory, and assembly costs
4Device complexity
If a continuous rod with angled lower portions is used, then the component count is reduced and manufacturing is simplified, but adaptability for various seat designs may be limited
Solution Approach 1:
The continuous rod incorporates angled lower portions at specific locations to provide engagement surfaces for different seat designs. This localized geometric variation allows the same basic rod structure to adapt to different mounting configurations and seat types without requiring complete redesign
Data Source
AI summary
An adjustable head restraint assembly for a vehicle seat is provided with a pair of shells. Each shell is sized to mate with the other and collectively retain a pair of posts therebetween. A frame adapted to mate with the pair of shells for retaining the pair of shells upon the pair of posts. A locking mechanism is provided on at least one of the frame and the pair of shells for locking the pair of shells and the frame to the pair of posts, and for permitting adjustment of the pair of shells and the frame along the posts.