Rear-Facing Child Safety Seat Ride-Down Mechanism
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Solution Overview
Problem
Existing child safety seats face challenges in controlling seat movement during accidents, which can lead to sudden and injurious forces on children, and there is a need for a rear-facing safety seat with ride-down capabilities and recline adjustability without compromising safety.
Innovation Solution
A rear-facing safety seat design featuring a detachable seat unit and base unit with a ride-down mechanism, including a braking element and adjustable recline, where the seat unit moves relative to the base unit during high forces and remains stationary otherwise, incorporating a sacrificial pin and secondary locking mechanism for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the safety seat is fixedly secured to the vehicle using rigid attachment mechanisms, then the seat stability during normal use is improved, but the seat cannot effectively dissipate sudden forces during accidents
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static rigid connection to a dynamic system that adapts to loading conditions. The base carriage is designed to move relative to the base body through a controlled path when forces exceed a threshold, while remaining stationary during normal use. This dynamic behavior allows the seat to maintain stability during normal operation while dissipating sudden forces during accidents through controlled movement.
Solution Approach 2:
The patent implements parameter changes by modifying the connection state between the base carriage and base body based on force magnitude. A sacrificial pin mechanism is used to transition the system from a locked state (during normal use) to a movable state (during accident). The braking element also changes its engagement state based on movement, providing friction-based force dissipation when the carriage moves relative to the base body.
2Ease of operation
If the seat unit is made detachably engageable with the base unit, then the ease of operation is improved, but the reliability may be compromised
Solution Approach 1:
The patent uses an intermediary coupling mechanism between the seat unit and base unit that provides both ease of detachment and secure connection. The coupling allows simple installation and removal operations while incorporating locking features that ensure reliable connection during normal use. The intermediary design separates the detachment function from the secure connection function, allowing each to be optimized independently.
3Object-affected harmful factors
If a braking element is added to control seat movement during ride down, then the force dissipation capability is improved, but the device complexity increases
Solution Approach 1:
The braking element is designed to activate automatically based on the movement state of the base carriage relative to the base body. When the carriage moves during ride down, the braking element engages through the relative motion itself, without requiring external control systems. This self-activating mechanism provides force dissipation capability while minimizing added complexity by eliminating the need for sensors, actuators, or control electronics.
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
The safety seat effectively dissipates sudden forces during accidents while allowing recline adjustments, providing enhanced protection and comfort for children by controlling deceleration and maintaining stability during normal use.
Implementation Method 1
A braking element is coupled to the base body and the base carriage, and is adapted to normally bias the base carriage toward the resting position
Implementation Method 2
The primary locking mechanism may include a sacrificial pin extending between the base body and the base carriage and adapted to break when the force acting on the base carriage is above the prescribed threshold
Data Source
AI summary
A safety seat includes a base unit adapted to be attached to the vehicle. The base unit includes a base body, and a base carriage coupled to the base body and moveable relative thereto from a resting position to a ride down position. Movement of the base carriage from the resting position to the ride down position is caused by a force acting on the base carriage that is above a prescribed threshold. A braking element is coupled to the base body and the base carriage, and is adapted to bias the base carriage toward the resting position. A seat unit is detachably engageable with the base carriage and defines a seat cavity sized and configured to receive the child.