Child Safety Seat Base Angle Restraining Structure
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Solution Overview
Problem
Conventional child safety seats can over-recline beyond the safety angle of 70 degrees due to their flat seat base design, which fails to prevent excessive reclining during crash tests.
Innovation Solution
A seat base with an angle restraining structure, featuring an inclined wall or ribs, is integrated into the child safety seat to limit the recline angle of the backrest portion, ensuring it remains below 70 degrees while allowing adjustable positions for comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat seat base is used to provide a comfortable seating surface, then the seating comfort is improved, but the backrest portion may over-recline beyond the safety angle of 70 degrees
Solution Approach 1:
The seat base is divided into two functional zones: a flat seating surface area for comfort and an inclined rear portion with an angle restraining structure for safety. This segmentation allows the front part to remain flat while the rear part prevents over-reclining, resolving the contradiction between comfort and safety.
Solution Approach 2:
An angle restraining structure acts as an intermediary element between the flat seat base and the backrest portion. This structure includes an inclined wall or rib that physically limits the recline angle to 70 degrees or less, preventing over-reclining while allowing the rest of the seat base to remain flat for comfort.
2Reliability
If the seat base is designed with an angle restraining structure to prevent over-reclining, then the safety compliance is improved, but the structural complexity of the seat base increases
Solution Approach 1:
The angle restraining structure is merged with the seat base as an integral component rather than a separate attachment. The inclined wall or rib is formed as part of the seat base structure itself, reducing the number of separate parts and simplifying manufacturing while maintaining safety functionality.
Solution Approach 2:
The seat base geometry is modified by changing the angle parameter of the rear portion to create the restraining effect. By adjusting the inclination angle of the rear section, the maximum recline angle is naturally limited to 70 degrees or less, achieving safety compliance through geometric design rather than complex mechanical constraints.
3Adaptability or versatility
If the backrest portion is made pivotable to allow angle adjustment for comfort, then the adaptability is improved, but the risk of over-reclining beyond 70 degrees increases
Solution Approach 1:
The angle restraining structure provides preliminary anti-action by pre-establishing a physical barrier (inclined wall or rib) that prevents the backrest from reclining beyond 70 degrees. This preventive measure is built into the structure before any over-reclining can occur, countering the potential harmful effect of the pivotable design.
Solution Approach 2:
The backrest portion maintains its pivotable dynamic characteristic for comfort adjustment, but the angle restraining structure introduces a dynamic limit that allows movement within safe angles while automatically preventing excessive recline. The system remains dynamic and adjustable but with built-in safety boundaries.
Data Source
AI summary
A seat base of a child safety seat is adapted to be rested on a vehicle seat. The child safety seat includes a seat shell removably mounted on the seat base. The seat shell has a bottom portion and a backrest portion. The seat base includes an upper facing wall, front and rear positioning members disposed to position the seat shell to the seat base, and an angle restraining structure raised from the upper facing wall and configured to restrain a largest recline angle of the backrest portion of the seat shell. A safety included angle of the seat shell is not more than 70 degrees, thereby ensuring prevention of over-reclining of the child safety seat.