Crotch Buckle Retention via Asymmetric Dynamic Connection
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Solution Overview
Problem
Current child safety seats lack effective energy absorption during crash events, particularly in forward-facing collisions, as the crotch buckles are attached to stationary crossbars that do not absorb energy in compression.
Innovation Solution
The system incorporates a crotch plate connected by a tensile member that resists movement in one direction while allowing movement in another, using connection members like straps or springs to absorb compressive forces and distribute tension, thereby reducing forces on the child during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the crotch buckle is attached to a stationary crossbar, then the structural stability is improved, but the energy absorption capability during crash events deteriorates
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a stationary crossbar to a dynamic connection member that can move and deform during crash events. The connection member is designed to allow relative movement between the crotch buckle and seat frame, enabling energy absorption through controlled deformation while maintaining structural integrity. This dynamic capability allows the system to adapt to impact forces and absorb energy effectively.
Solution Approach 2:
The patent employs parameter changes by modifying the mechanical properties of the connection member to exhibit different behaviors under different loading conditions. The connection member is designed with specific material and geometric parameters that allow it to be stiff under normal conditions for stability, but capable of controlled deformation under crash loads for energy absorption. This parameter optimization resolves the contradiction between stability and energy absorption.
2Loss of energy
If the connection member allows movement in compressive direction, then the energy absorption during forward-facing crashes is improved, but the resistance to upward movement during rear-facing impacts deteriorates
Solution Approach 1:
The patent applies asymmetry by designing the connection member with different mechanical characteristics for compression and tension loads. The connection member is configured to be compliant in compression (allowing movement for energy absorption) while maintaining strength in tension (resisting upward movement). This asymmetric behavior is achieved through specific geometric design and material selection, resolving the contradiction between energy absorption and upward movement resistance.
Solution Approach 2:
The dynamic nature of the connection member enables it to exhibit different stiffness characteristics depending on the loading direction and magnitude. During forward-facing crashes, the connection member allows compressive movement for energy absorption. During rear-facing impacts, the same connection member provides tensile resistance to prevent excessive upward movement. This dynamic adaptability resolves the apparent contradiction.
3Device complexity
If the seat pan is entirely stationary, then the structural simplicity is improved, but the capability to absorb crash energy deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the seat structure into distinct functional components: a stationary seat pan for simplicity and a separate dynamic connection member for energy absorption. This segmentation allows the majority of the seat structure to remain simple and stationary, while only the specific connection member between the crotch buckle and seat frame incorporates the complex dynamic characteristics needed for energy absorption. This resolves the contradiction between structural simplicity and energy absorption capability.
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 reduces chest gravitational forces during collisions by allowing the seat to absorb energy in compressive directions and providing strong resistance in tensile directions, enhancing safety by minimizing upward movement during rear-facing impacts and allowing seat pan deformation during forward-facing impacts.
Implementation Method 1
The at least one connection member may significantly resist movement in a first direction and may significantly allow movement in a second direction different from the first direction
Implementation Method 2
The at least one connection member may significantly resist movement in a first direction and may significantly allow movement in a second direction different from the first direction
Data Source
AI summary
The present disclosure pertains to a system configured to secure a crotch plate of a child car seat while providing for lower forces upon the seated child during impact events. Some embodiments may include: a seating surface and a back surface; an internal harness, including a crotch strap; a crotch plate for mounting the crotch strap thereto; and at least one connection member for connecting the crotch plate to an anchor mounted below the seating surface. The at least one connection member may significantly resist movement in a first direction and may significantly allow movement in a second direction different from the first direction.