Child Safety Seat Top Tether Guiding Mechanism
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Solution Overview
Problem
Child safety seats with ISOFIX systems face issues where top tethers either impair recline functionality or require re-adjustment, leading to potential misuse and increased safety risks due to rotation during frontal collisions, without a cost-effective solution to prevent these issues.
Innovation Solution
A child safety seat design featuring a guiding mechanism on the shell that slidably supports the top tether between two anchoring points, maintaining tension and preventing forward rotation during collisions, while allowing recline functionality without length adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top tether is attached to the shell at an upper portion, then the anti-rotation function is improved, but the recline functionality is impaired requiring length re-adjustment
Solution Approach 1:
A guiding mechanism is introduced as an intermediary component between the top tether and the shell. The guiding includes a guiding element mounted on the shell and a guiding channel that directs the top tether, allowing the tether to slide along the channel during recline movements. This mediator enables both anti-rotation and recline functions to operate simultaneously without interference.
Solution Approach 2:
The top tether connection system is made dynamic through the sliding mechanism along the guiding channel. Instead of a fixed attachment point, the tether can move dynamically along the channel as the shell reclines, automatically adjusting its position to maintain proper tension and geometry throughout the range of motion.
2Reliability
If the top tether length is fixed, then the anti-rotation effectiveness is improved, but the adaptability to different recline positions is reduced
Solution Approach 1:
The system transitions from a static fixed-length tether to a dynamic sliding tether that moves along the guiding channel. The tether length relative to the shell changes dynamically as it slides along the channel during recline, while the actual tether material length remains constant, providing both effectiveness and adaptability.
Solution Approach 2:
The top tether system performs self-adjustment through the sliding mechanism along the guiding channel. As the shell reclines, the tether automatically slides to the appropriate position without requiring manual intervention, maintaining proper tension and geometry throughout the recline range.
3Ease of operation
If a high back base is used to attach the top tether, then the recline functionality is preserved, but the production costs increase substantially
Solution Approach 1:
The child safety seat is divided into functional modules: a base unit and a shell unit that can recline relative to the base. The top tether system is integrated into the shell module with the guiding mechanism, allowing the tether attachment to remain on the shell while preserving recline functionality, avoiding the need for an expensive high back base modification.
Solution Approach 2:
The guiding mechanism serves as a cost-effective intermediary solution that enables the shell-mounted tether system to achieve the functional equivalence of a high back base configuration, allowing recline movement without requiring the substantially more expensive high back base structure.
Data Source
Figure 1a~1b
Figure 2a~2b
AI summary
A child safety seat is disclosed, wherein the child safety seat comprises: a base (2) comprising an attachment point (7), a shell (1) comprising a guiding (6) mounted on an upper portion of the shell, and a top tether (8) connected to the attachment point of the base, wherein the guiding is configured to guide and slidably support the top tether when the top tether is secured to an anchoring point of a vehicle.