Front-Adjustable Child Safety Seat With Tiered Crash Damping
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Solution Overview
Problem
Child safety seats often require removal from vehicles for adjustments and lack effective force dampening mechanisms to accommodate varying child sizes and weights during accidents.
Innovation Solution
A child safety seat design featuring a front-accessible adjustable headrest and shoulder strap mechanism, a force dampening system with tiered crush cylinders, and a latch release mechanism accessible from the front, allowing for adjustments without removing the seat and providing progressive resistance to absorb crash forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shoulder belts are adjusted by drawing them back through slots to the back of the safety seat, then the shoulder belts can be repositioned to different heights, but the seat must be removed from the vehicle which is time consuming and awkward
Solution Approach 1:
The patent inverts the conventional adjustment approach by providing access to the adjustment mechanism from the front of the seat rather than requiring access from the back. The shoulder belts are routed through slots in the seat back, but the adjustment mechanism includes a release member accessible from the front, allowing users to adjust shoulder belts while the seat remains installed in the vehicle.
2Ease of manufacture
If rigid latch members are used to secure the seat to the vehicle, then installation is more convenient, but removal is difficult due to the hard-to-reach location of the release mechanism
Solution Approach 1:
The patent applies inversion by relocating the latch release mechanism from the rear of the seat to the front. The rigid latch members extend from the rear to engage with vehicle anchors, providing secure installation, while the release member is positioned at the front of the seat where it is easily accessible for removal operations.
3Device complexity
If a single energy absorbing cylinder is used, then the structure is simple, but the force dampening is ineffective for varying child sizes and weights
Solution Approach 1:
The patent segments the single energy absorbing cylinder into multiple tiered crush cylinders with different collapse forces. The system includes a first crush cylinder and a second crush cylinder, each with progressively increasing collapse forces. This segmentation allows the system to provide appropriate resistance levels for children of varying sizes and weights while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent applies local quality by giving each crush cylinder different collapse force characteristics. The first crush cylinder has a lower collapse force suitable for smaller children, while the second crush cylinder has a higher collapse force for larger children. Each cylinder is locally optimized for its specific function within the tiered system.
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
Enables convenient and efficient adjustments without seat removal, effectively reducing forces on children during accidents by providing tailored resistance through the tiered crush cylinders and accessible latch release.
Implementation Method 1
a force dampening system with tiered crush cylinders, and a latch release mechanism accessible from the front, allowing for adjustments without removing the seat and providing progressive resistance to absorb crash forces
Data Source
AI summary
A child safety seat includes a headrest assembly that is vertically adjustable. The headrest assembly includes a release member accessible from the front of the seat and a shoulder belt support member that is secured to the release member and movable therewith. The child safety seat also includes a base and a seat body that is movable relative to the base. A force dampening system progressively absorbs forces acting upon the child safety seat as the seat body moves relative to the base. A latch release assembly is also provided to disengage clamp members from lower attachment hooks in a vehicle, the release assembly including a release lever accessible from the front of the car seat.