Break-Away Belt Guide for Symmetric Car Seat Crash Loading
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Solution Overview
Problem
Existing car seat designs face challenges in distributing forces symmetrically during a vehicular collision, particularly when using both lap and shoulder belts, leading to asymmetrical force distribution and increased complexity or weight.
Innovation Solution
A break-away belt guide design that reroutes the vehicle's belt set along a deviation path from the original path, reducing forces experienced by the occupant and distributing them more symmetrically, while maintaining a simplified structure and allowing for reset in case of accidental overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If features are added to counteract asymmetry of force distribution, then force distribution symmetry is improved, but weight and complexity increase
Solution Approach 1:
A belt guide is introduced as an intermediary component to redirect the shoulder belt and modify the force distribution path. The belt guide mediates between the asymmetrical belt configuration and the car seat structure, creating more symmetrical force distribution without requiring complex structural modifications to the car seat itself
Solution Approach 2:
The belt guide creates a new spatial dimension for force distribution by routing the belt through a three-dimensional path rather than a simple planar attachment. This dimensional change allows forces to be distributed more evenly across the car seat structure without increasing overall complexity
2Strength
If a break-away design is implemented to absorb forces, then force absorption capability is improved, but structural complexity increases
Solution Approach 1:
The belt guide is divided into separable components including a break-away tab that can detach under excessive force. This segmentation allows the structure to absorb impact forces through controlled failure of the tab, protecting the main car seat structure while maintaining overall simplicity
Solution Approach 2:
The break-away tab is designed to be discarded (broken off) when force exceeds a certain threshold, absorbing the excess force through its controlled failure. After the incident, the tab can be recovered and replaced, resetting the system without requiring complex repair mechanisms
3Stability of the object's composition
If the belt set is rerouted along a deviation path, then force distribution symmetry is improved, but ease of operation decreases
Solution Approach 1:
The belt guide serves as a mediator that simplifies the rerouting process by providing pre-formed channels and guides for the belt to follow. Instead of requiring complex manual routing, the belt simply needs to be threaded through the belt guide's designated path, maintaining ease of operation while achieving symmetrical force distribution
Data Source
AI summary
A car seat configured to be fastened to a vehicle, includes a seat shell and a belt guide disposed at the seat shell to redirect a belt set of the vehicle for rerouting the belt set along a deviation path from an original path. When the belt set is not engaged with the belt guide, the belt set is routed along the original path. When the belt set is engaged with the belt guide, the belt set is routed along the deviation path from the original path. The rerouted belt set improves the symmetry of forces encountered by the vehicle and also improves the kinetics of the car seat during a crash. A break-away feature in the belt guide advantageously absorbs forces at different times during a crash.