Child Restraint Parallelogram Lift to Prevent Forward Seat Shift
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Solution Overview
Problem
Height-adjustable child restraints with scissor mechanisms compromise safety by allowing the seat section to move away from the vehicle's backrest during accidents, posing a safety hazard.
Innovation Solution
A height-adjustable child restraint using a parallelogram mechanism with a guide plate and sliding rail system to maintain the seat's position close to the vehicle's backrest, incorporating a stabilizing element to prevent forward movement during accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a height-adjustable seat section based on scissors-technology is used, then the child restraint can be adjusted to different heights, but the seat section may move away from the backrest of the vehicle's seat in case of an accident, causing safety hazards
Solution Approach 1:
A guide plate is introduced as an intermediary component between the seat section and the base. The guide plate includes a guide slot that vertically guides the seat section's movement while preventing forward displacement during accidents. This intermediary structure resolves the contradiction by enabling height adjustment through vertical movement while ensuring safety by constraining forward motion.
Solution Approach 2:
The seat section is designed with dynamic height adjustment capability through the parallelogram mechanism, allowing it to move vertically along the guide slot. The system transitions from a static fixed-position design to a dynamic adjustable design, where the seat section can adapt its height while the guide plate ensures it remains properly positioned during normal use and accidents.
2Adaptability or versatility
If a height-adjustable seat section is used, then children of different ages and lengths can travel safely, but the robustness of the child restraint decreases
Solution Approach 1:
The height adjustment mechanism is segmented into distinct functional components: the parallelogram mechanism for height adjustment and the guide plate for positional constraint. This segmentation allows the adjustment function to be separated from the structural support function, enabling height variability while maintaining overall structural robustness through the guide plate's anchoring to the base.
3Reliability
If a parallelogram mechanism with guide plate is used, then the upper frame member remains secured close to the backrest, but the device complexity increases
Solution Approach 1:
The guide plate is merged with the base structure, and the guide slot is integrated into the guide plate itself. This merging reduces the number of separate components and simplifies the overall structure while maintaining the safety function. The guide slot is formed as part of the guide plate rather than as a separate guiding mechanism.
Data Source
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AI summary
A height-adjustable child restraint for use in a forward facing position, said child restraint comprising: a seat portion for holding a child and a base portion, wherein said base portion comprises an upper frame member for connection with said seat portion and a lower frame member to be placed on a vehicle seat, wherein at least one front beam connects a front portion of said upper frame member to a front portion of said lower frame member, and at least one rear beam connects a rear portion of said upper frame member to a rear portion of said lower frame member such that a parallelogram is formed; and at least one guide plate connected to said lower frame member, wherein at least one of said upper frame member and said rear beam is movably connected to said guide plate for vertical movement of said upper frame member relative said guide plate.