Child Seat Secondary Latch Interlock for Secure Shell Release
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Solution Overview
Problem
Existing child restraint systems face challenges in preventing unintentional separation of the seat shell from the base assembly, which hinders proper installation and poses safety risks, while also limiting access for tensioning vehicle belts.
Innovation Solution
A child safety seat with a connector assembly featuring a latching mechanism and a secondary latch interlock that requires a predefined operational configuration and a tool-operated actuator to ensure secure attachment and detachment, preventing accidental separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latching mechanism is provided to securely connect the seat shell to the base assembly, then the reliability of the connection is improved, but the device complexity increases due to the need for additional locking components and interlock mechanisms
Solution Approach 1:
The latching mechanism is divided into distinct functional components: a primary latch member with a latch arm, a secondary latch member with a separate latch arm, and an interlock mechanism. Each component performs a specific function, allowing the system to achieve high reliability through modular design while managing complexity through clear functional separation.
Solution Approach 2:
The latch members are designed to be movable rather than fixed, allowing them to engage and disengage from retention structures. The interlock mechanism dynamically controls the movement of the second latch member based on the position of the first latch member, providing adaptive security without requiring a completely separate control system.
2Reliability
If the seat shell is securely locked to the base assembly, then safety is improved, but the ease of operation deteriorates because users cannot easily separate the components for belt tensioning
Solution Approach 1:
The system requires the first latch member to be fully engaged in its retention structure before the second latch member can be actuated. This preliminary engagement ensures that the seat shell is securely connected to the base assembly before allowing separation, maintaining safety while enabling controlled operation when needed.
Solution Approach 2:
The interlock mechanism acts as an intermediary between the two latch members, controlling the operation of the second latch member based on the state of the first. This intermediary mechanism ensures that separation only occurs when proper engagement has been established, balancing safety requirements with operational needs.
3Reliability
If a secondary latch interlock is added to prevent unintentional separation, then the reliability is improved, but the device complexity increases due to additional actuation requirements
Solution Approach 1:
The interlock mechanism is integrated with the existing latch members rather than being a completely separate system. The second latch member's actuator incorporates the interlock function, combining the separation actuation and safety interlock functions into a single integrated component, thereby reducing overall system complexity while maintaining enhanced reliability.
Solution Approach 2:
The interlock mechanism automatically monitors the engagement state of the first latch member and controls the availability of the second latch member accordingly. The system self-regulates based on its own state, eliminating the need for external sensors or control systems and reducing complexity while maintaining reliable protection against unintentional separation.
Data Source
AI summary
A child safety seat for use in a vehicle includes a base assembly securable to a seat in a vehicle, a seat shell connectable to the base assembly in a forward-facing configuration, a rearward-facing configuration, or moveable therebetween, a connector assembly having a latching mechanism operably configured to permit selective release of the connector assembly thereby enabling separation of the seat shell from the base assembly, and a secondary latching mechanism, the secondary latching mechanism configured to prevent operation of the latching mechanism in one or more predetermined operational configurations.