Polyurethane Foam Child Safety Seat with Everted Rim
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Solution Overview
Problem
Existing child safety seats are uncomfortable and insecure for children due to hard shock-absorbing materials and thin cloth covers, leading to discomfort and safety risks during car travel.
Innovation Solution
A child safety seat design featuring a headrest and seat frame assembly with polyurethane soft foam covered by a surface layer, utilizing a 'three-proofing' technology for fabric or leather to ensure comfort, security, and easy maintenance, with a telescopic structure for mold release and snap-fit assembly for convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard shock-absorbing materials such as EPS are used, then safety and shock absorption performance are improved, but comfort and ease of operation deteriorate
Solution Approach 1:
The patent uses polyurethane soft foam instead of hard EPS materials. The soft foam provides both shock absorption and comfort, eliminating the need for thin cloth covers. This composite material approach resolves the contradiction by achieving safety through energy absorption while maintaining comfort through material softness and thickness.
Solution Approach 2:
The patent changes the material parameter from hard EPS to soft polyurethane foam, and increases the thickness of the cushioning layer. This parameter change allows the material to simultaneously provide safety (shock absorption) and comfort (softness), resolving the contradiction between these two requirements.
2Device complexity
If thin cloth cover is used for wrapping shock-absorbing material, then device complexity is reduced, but comfort and protection deteriorate
Solution Approach 1:
The patent replaces the combination of hard material plus thin cloth cover with a single thick layer of soft polyurethane foam. This composite material approach eliminates the need for additional wrapping layers while providing superior comfort and protection, thus reducing structural complexity while improving comfort.
3Manufacturing precision
If traditional assembly methods are used, then manufacturing precision is maintained, but productivity and ease of manufacture deteriorate
Solution Approach 1:
The patent integrates the cushioning layer directly into the shell structure through injection molding, merging two separate components (shell and cushioning) into a single integrated part. This eliminates separate assembly steps, improves productivity, and maintains manufacturing precision through one-step成型 process.
Solution Approach 2:
The injection molding process allows the cushioning layer to self-form and self-attach to the shell structure during the molding process itself. This self-service approach eliminates the need for separate attachment operations, improving assembly efficiency while maintaining precision through the molding process.
Data Source
AI summary
A child safety seat, including a headrest frame assembly and a seat frame assembly The seat frame assembly is matedly connected with the headrest frame assembly. The headrest frame assembly includes a headrest frame, an inner wall of the headrest frame is provided with a headrest polyurethane soft foam, the headrest polyurethane soft foam extends toward an outer wall of both sides of the headrest frame to form an everted rim, and the outer wall of the said headrest frame is provided with a headrest shell. The seat frame assembly includes a seat frame, an inner wall of the seat frame is provided with a seat polyurethane soft foam, the seat polyurethane soft foam extends toward an outer wall of both sides of the seat frame to form an everted rim, and the outer wall of the seat frame is provided with a seat shell.