Extensible Cradle Tail for Movable Headrest in Child Restraint
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Solution Overview
Problem
Existing child restraints for vehicles lack effective mechanisms to ensure the safety and comfort of children by exposing them to open channels and cavities in the backrest, which can pose hazards and discomfort, especially when the headrest is adjusted.
Innovation Solution
A juvenile vehicle seat with a movable headrest and an extensible cradle tail that adjusts in length to cover any forward-facing openings in the backrest, ensuring the child is protected and comfortable regardless of the headrest position, utilizing a cradle-height controller and elastic connectors to expand or contract the cradle tail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the headrest is made movable and adjustable to different positions, then the adaptability and comfort for children of different sizes is improved, but open channels and cavities in the backrest may expose the child to hazards
Solution Approach 1:
The cradle tail is designed as an extensible dynamic structure that automatically adjusts its length based on the headrest position. When the headrest is raised, the cradle tail extends to cover the open channels and cavities; when the headrest is lowered, the cradle tail contracts. This dynamic adaptation ensures continuous protection against harmful exposures while maintaining headrest adjustability for different child sizes.
Solution Approach 2:
The cradle tail acts as an intermediary element between the headrest and the child. It fills the gap created by the movable headrest mechanism, covering the open channels and cavities in the backrest. This intermediary structure transmits the protective function from the headrest assembly to the child, blocking harmful exposures while allowing the headrest to move freely for adjustment.
2Reliability
If the cradle tail is made extensible to cover openings when headrest is raised, then the safety by covering open channels is improved, but the device complexity increases
Solution Approach 1:
The cradle tail utilizes elastic material properties to change its length parameter dynamically. The elastic connectors allow the cradle tail to extend and contract based on the headrest position without requiring complex mechanical actuation systems. This parameter change approach maintains safety protection while minimizing device complexity by leveraging the inherent elastic properties of the material.
Solution Approach 2:
The cradle tail is designed to automatically extend and contract in response to headrest movement without requiring external control mechanisms. The elastic connectors self-adjust the cradle tail length based on the spatial relationship between the headrest and the child, making the system self-regulating and reducing overall device complexity while maintaining continuous safety protection.
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 solution provides a safe and comfortable seating experience by ensuring the child is not exposed to open channels or cavities, allowing caregivers to easily adjust the headrest to various positions without compromising safety or comfort.
Implementation Method 1
An elastic upper-panel connector is included in the extensible cradle tail to connect an upper end of the middle panel to the wide upper panel. An elastic lower-panel connector is included in the extensible cradle tail to connect the lower end of the middle panel to the narrow lower panel. The elastic upper-panel and lower-panel connectors can expand in length during upward movement of the headrest cradle away from the seat bottom to lengthen the extensible headrest tail and contract in length to shorten the extensible headrest tail as the headrest cradle moves downwardly on the backrest towards the seat bottom.
Data Source
AI summary
A child restraint includes a seat bottom and a seat back. The seat back includes a backrest and a headrest that is mounted for up-and-down movement on the backrest toward and away from the seat bottom.