Child Seat Headrest Structure for Lateral Impact Force Redirection
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Solution Overview
Problem
Existing child restraints do not effectively manage and reduce the forces experienced by a child's head during a lateral impact event, potentially leading to high Head Injury Criterion (HIC) scores.
Innovation Solution
A child restraint with a headrest featuring energy-redirection means, including deformable rims coupled to head-support wings, which redirect and distribute impact forces across a larger area and time, reducing the cumulative force on the child's head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional rigid headrest structures are used, then structural simplicity is maintained, but the cumulative force on the child's head during lateral impact cannot be effectively reduced
Solution Approach 1:
The headrest structure is segmented into multiple functional components: head-support wings with deformable rims, energy-redirection means, and force-distribution elements. This segmentation allows each component to specifically address different aspects of force management during lateral impact, transforming a single rigid structure into a multi-functional system that actively reduces cumulative force on the child's head.
Solution Approach 2:
The headrest incorporates dynamic elements including deformable rims that can flex and energy-redirection means that activate during impact events. These dynamic components allow the headrest to adapt its structural response based on the magnitude and direction of applied forces, enabling effective force reduction only when needed during lateral impact while maintaining normal support functionality during routine use.
2Object-affected harmful factors
If force is concentrated at the impact point, then the structural response is simple, but the Head Injury Criterion (HIC) score increases
Solution Approach 1:
The headrest employs head-support wings that extend laterally beyond the immediate impact zone, distributing force across a broader spatial dimension. The energy-redirection means redirect forces in multiple directions rather than allowing concentration at a single point, effectively transforming a one-dimensional impact into a multi-dimensional force distribution pattern that reduces the HIC score.
Solution Approach 2:
The deformable rims and energy-redirection means act as intermediary elements between the child's head and the rigid headrest structure. These intermediaries absorb, redirect, and distribute impact forces, preventing direct transmission of concentrated forces to the child's head and thereby reducing the HIC score.
3Object-affected harmful factors
If the headrest contacts the child's head immediately during impact, then the response time is short, but the cumulative force cannot be dispersed over sufficient time
Solution Approach 1:
The deformable rims are pre-configured to deform during impact, providing beforehand cushioning that extends the duration of force application. This pre-planned deformation capability allows the headrest to automatically increase impact duration and disperse forces over a longer time period, reducing cumulative force on the child's head without requiring active control systems.
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 child restraint significantly lowers the Head Injury Criterion (HIC) score by decelerating the child's head and dispersing forces over a greater area and time, providing enhanced safety during lateral impacts.
Implementation Method 1
the head-movement controllers are configured to redirect at least a portion of a cumulative force from the head of the child during an impact event into at least a first force extending into one of the first and second headrest side walls and a second force extending outwardly away from the rear headrest wall of the headrest
Implementation Method 2
the head-movement controllers are configured to deform under load from the child's head during the lateral impact event to reduce forces experienced by the child
Implementation Method 3
This decelerates the child's head and disperses forces acting on the child's head over a greater area and longer period of time thereby reducing the potential for a cumulative force that may injure the child
Data Source
AI summary
A child restraint includes a seat bottom and a seat back coupled to the seat bottom. The seat back includes a backrest configured to extend upwardly from the seat bottom and a headrest coupled to the backrest for supporting a head of a child. The headrest includes a rear section arranged along the backrest, a first side section extending outwardly away from the rear section, and a second side section extending outwardly away from the rear section and away from the first side section.