Convertible Car Seat Frame with Varying Stiffness for Crash Energy Management
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Solution Overview
Problem
Existing convertible car seats often have frames that do not adequately manage energy during both forward-facing and rear-facing crash events, either sacrificing performance in one mode or increasing complexity, weight, and cost with passive components that degrade over time.
Innovation Solution
A convertible car seat with a support frame featuring a first and second frame portion with varying stiffness and cross-sectional areas, designed to controllably deform during crashes, eliminating the need for passive energy management components and simplifying installation and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frame is designed to optimize energy management in forward-facing mode, then energy management performance is improved, but energy management performance deteriorates in rear-facing mode
Solution Approach 1:
The frame incorporates portions with different stiffness characteristics - some portions are more rigid while others are more compliant. This local differentiation allows the frame to manage energy effectively in both forward-facing and rear-facing crash modes, as each portion can be optimized for specific loading directions and magnitudes encountered in different crash scenarios
2Adaptability or versatility
If a frame is designed to balance performance in both forward-facing and rear-facing modes, then adaptability is improved, but energy management performance deteriorates in both modes
Solution Approach 1:
Rather than uniformly balancing performance, the frame uses locally optimized portions with varying stiffness - some areas are designed to be rigid for strength while other areas are compliant for energy absorption. This allows the frame to achieve optimal energy management in both crash modes simultaneously, rather than compromising overall performance
3Reliability
If passive energy absorption components are added to improve energy management, then energy management performance is improved, but device complexity increases
Solution Approach 1:
The patent integrates energy absorption functionality directly into the frame structure itself, merging the functions of structural support and energy management into a single unified component. This eliminates the need for separate passive energy absorption components, thereby maintaining energy management performance while reducing device complexity
Solution Approach 2:
The frame portions are designed to actively manage energy through their inherent structural properties - the compliant portions deform to absorb energy while the rigid portions maintain structural integrity. The frame serves its own energy management needs without requiring additional passive components, simplifying the overall device
4Reliability
If passive energy absorption components are added to improve energy management, then energy management performance is improved, but weight increases
Solution Approach 1:
By combining the energy absorption function with the existing frame structure, the patent avoids adding separate heavy passive components. The frame portions themselves provide energy absorption through their designed compliance, eliminating the need for additional weight-bearing energy absorption components
5Reliability
If passive energy absorption components are added to improve energy management, then energy management performance is improved, but manufacturing cost increases
Solution Approach 1:
The integration of energy absorption functionality into the frame structure reduces the total number of components that need to be manufactured, assembled, and quality-checked. This consolidation simplifies the manufacturing process and reduces costs while maintaining energy management performance
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 car seat optimizes energy management during both crash modes without additional passive components, reducing complexity and cost while maintaining performance and safety standards.
Implementation Method 1
a support frame positioned at least partially within the seat shell and configured to manage energy during a crash event. The support frame may include a first frame portion and a second frame portion attached to the first frame portion
Data Source
AI summary
A car seat may include a seat shell configured for supporting a child thereon, a base supporting the seat shell, and a support frame positioned at least partially within the seat shell and/or the base and configured to manage energy during a crash event. The support frame may include a first frame portion and a second frame portion attached to the first frame portion. The first frame portion may include a first side support and a second side support spaced apart from one another, and the second frame portion may include a first side support and a second side support spaced apart from one another. A stiffness of each of the first side support and the second side support of the second frame portion may be different than a stiffness of each of the first side support and the second side support of the first frame portion.