Vehicular Headrest Composite Frame and Foam Structure
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Solution Overview
Problem
Existing vehicular headrest designs face challenges such as increased injury risk due to reduced surface foam thickness, complex manufacturing processes, and non-compliance with FMVSS 202a backset retention requirements, particularly when using hard plastic inserts or low ball rebound foams.
Innovation Solution
A vehicular headrest system featuring a non-foam frame element with a non-foam insert and a resilient element made of homogeneous foam, where the frame and insert are embedded, and the insert is free of enclosed cavities, allowing for a simpler construction that meets FMVSS 202a requirements without the need for rigid foam inserts or hard plastic shells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface foam thickness is reduced to control head deflection, then head deflection control improves, but injury risk increases
Solution Approach 1:
The headrest combines a resilient element (foam) with a rigid support frame structure to create a composite system. The frame provides structural support and deflection control while the foam layer maintains adequate thickness for injury protection, resolving the contradiction between deflection control and injury risk.
2Strength
If hard plastic inserts are used to increase load bearing capacity, then load bearing capacity improves, but manufacturing complexity increases
Solution Approach 1:
The patent removes the hard plastic insert component entirely and replaces it with a rigid support frame structure that is integrated with or replaces the foam core. This extraction of the complex insert component simplifies manufacturing while maintaining load bearing capacity through the frame structure.
3Ease of operation
If low ball rebound foam is used to improve softness feel, then comfort improves, but manufacturing complexity increases
Solution Approach 1:
The patent eliminates the need for specialized low ball rebound foam by removing the foam insert approach entirely. The rigid support frame structure provides the necessary support function, allowing use of simpler, more comfortable foam materials without manufacturing complexity.
4Strength
If rigid foam inserts are used to prevent head sinking, then head support improves, but compliance with FMVSS 202a backset retention requirement decreases
Solution Approach 1:
The combination of resilient foam element and rigid support frame creates a composite structure that provides head support through the frame while allowing the overall assembly to meet FMVSS 202a backset retention requirements, unlike rigid foam inserts that cause excessive head restraint hardness.
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
The solution provides structural rigidity and controlled deflection, reducing manufacturing costs and ensuring compliance with safety standards while maintaining a thicker, softer resilient element for improved load-bearing performance and reduced whiplash risk.
Implementation Method 1
the resilient element is configured to function as a head restraint to cushion the head of an occupant of the seat in the event of impact
Implementation Method 2
a resilient element in which at least a portion of the frame element and the entire insert are embedded, the resilient element consisting essentially of a homogeneous foam material
Data Source
AI summary
The invention relates to a vehicular seat system including a seat bottom and a seat back. The headrest is connected to the seat back. The headrest consists of a number of components. These components include: a non-foam frame element, a non-foam insert secured with respect to a portion of the frame element, and a resilient element in which at least a portion of the frame element and the entire insert are embedded. The resilient element consists essentially of a homogeneous foam material. The frame element comprises a pair of post elements for coupling to the vehicular seat back. The post elements are interconnected by a cross-piece element. The headrest is connected to the seat back such that the minimum distance between the outer surface of the headrest for contacting a head of an occupant and the insert is in the range of from about 10 mm to about 30 mm. The vehicular headrest useful in the present seat system is compliant with the FMVSS 202a backset retention requirement