Child Seat Headrest Foam Lip for Side-Impact Head Retention
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Solution Overview
Problem
Current child car seats with energy-absorbing foam in the headrest area fail to effectively retain a child's head during a side impact crash, as the outwardly angled sidewalls allow the head to move forward and potentially roll out of the protective area, especially in oblique crashes.
Innovation Solution
The foam liner in the headrest area is contoured with an inwardly protruding lip closer to the seat centerline than the rearward portion, reducing forward movement and enhancing head retention without adding cost or requiring consumer interaction, by maintaining the existing geometry and using a comfort pad to cover any concave contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sidewalls are angled outward to provide a wider protective area, then the headrest coverage area is increased, but the child's head moves forward more easily during side impact
Solution Approach 1:
The foam liner is configured with different local geometries: a first portion with a first slope and a second portion with a second slope that is more vertical than the first slope. This local variation in geometry allows the headrest to provide both wide coverage and effective head retention. The more vertical second portion prevents forward movement of the head while the overall outward angle maintains coverage area.
2Reliability
If the foam liner geometry is modified to improve head retention, then head retention capability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The foam liner incorporates a comfort pad that can be adjusted or removed, allowing the system to adapt to different manufacturing and usage requirements. The comfort pad can compensate for minor geometric variations in the foam liner, providing a buffer that simplifies manufacturing tolerances while maintaining head retention effectiveness.
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
This configuration effectively minimizes the child's head sliding forward and rolling out of the protective area during side impacts, providing enhanced safety with minimal additional cost and no aesthetic or practical impediments.
Implementation Method 1
rigid or semi-rigid energy absorbing foam in the area where a child's head would normally lie
Data Source
AI summary
The invention described herein relates to a foam geometry which reduces the tendency of the child's head to slide forward and roll out by contouring the side foam to have its leading edge closer to the center line of the child's seat than some more rearward portion of the side foam thus forming an inward protruding forward lip on the foam. The depth of the protruding lip is the primary determinant of the increase in head retention, but the particular geometry of the lip, foam density or rigidity, and overall depth also contribute. The invention relates to the contour of a horizontal section of a headrest foam liner being closer to the seat centerline at some distance from the seat back than some distance closer to the seat back.