Adjustable Crotch Strap Fixture for Child Seat Reliability
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Solution Overview
Problem
Conventional child safety seats with adjustable crotch straps require partial disassembly for adjustment, leading to potential incorrect assembly and weakened attachment, which can compromise safety during collisions.
Innovation Solution
A child safety seat design featuring a crotch strap with an adjustable intermediate portion that can be securely anchored to the seat shell, allowing for adjustment between multiple positions without disassembling the strap, using a fixture or bracket to hold the strap at desired positions, ensuring secure attachment and accommodating children of different sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the crotch strap is made adjustable to accommodate children of different sizes, then the adaptability is improved, but the device complexity increases due to required disassembly and adjustment mechanisms
Solution Approach 1:
The crotch strap is designed with an adjustable intermediate portion that can move between multiple positions relative to the seat shell, allowing dynamic adaptation to different child sizes while maintaining a simple overall structure. The fixture or bracket enables this adjustment without requiring disassembly of the anchor points.
2Adaptability or versatility
If the anchor point is made adjustable by partial disassembly, then the adaptability is improved, but the reliability deteriorates due to potential incorrect assembly and weakened attachment
Solution Approach 1:
The crotch strap is divided into three distinct portions: a first end portion anchored to the seat shell, a second end portion extending through the opening, and an intermediate portion that is adjustable. This segmentation allows adjustment of the intermediate portion without affecting the secure anchor points, maintaining both adaptability and reliability.
Solution Approach 2:
A fixture or bracket is introduced as an intermediary mechanism to hold the intermediate portion of the crotch strap at desired positions. This intermediary enables adjustment while ensuring the attachment remains secure and properly assembled, preventing the reliability issues associated with direct disassembly of anchor points.
3Device complexity
If the crotch strap uses a simple anchored design, then the device complexity is reduced, but the adaptability deteriorates as it cannot accommodate children of different sizes
Solution Approach 1:
The crotch strap incorporates an adjustable intermediate portion that can be positioned at multiple locations between the first and second end portions. This dynamic element allows a single simple structure to accommodate children of various sizes without complicating the overall design.
Solution Approach 2:
The adjustable intermediate portion serves multiple functions: it accommodates different child sizes, maintains proper harness geometry, and ensures safe restraint. This multi-functionality allows a single component to address various sizing needs without requiring multiple separate structures.
Data Source
AI summary
A child safety seat includes a seat shell having an opening, a crotch strap and a fixture. The crotch strap has a first end portion, a second end portion, and an intermediate portion between the first and second end portions. The first end portion is anchored with the seat shell, the second end portion extends outward through the opening, and the intermediate portion is adjustable relative to the seat shell between a first and a second position spaced apart from each other. The fixture is operable to hold the intermediate portion of the crotch strap at any of the first and second positions.