Vehicle Armrest Inertia Latch Spring Cam Mechanism
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Solution Overview
Problem
Conventional vehicle armrests lack a secure mechanism to maintain the armrest in a predetermined position during sudden deceleration or impact, potentially causing it to shift or move uncontrollably, compromising passenger safety and comfort.
Innovation Solution
Incorporating an inertia-activated cam mechanism that biases an inertial lock into selective engagement with a retention pin or guide slot, preventing the armrest from rotating away from a predetermined position by utilizing a biasing spring and pivot system, which engages when the vehicle decelerates rapidly, thereby maintaining the armrest's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inertia lock mechanism is added to secure the armrest during deceleration, then safety and stability are improved, but device complexity increases
Solution Approach 1:
The armrest system is divided into functional segments: the armrest assembly, the inertial lock mechanism, the retention pin, and the biasing spring. Each segment performs a specific function, allowing the complex safety mechanism to be broken down into manageable, independently analyzable components that work together to solve the stability problem.
Solution Approach 2:
The inertial lock mechanism is designed to automatically engage and disengage based on vehicle deceleration forces without requiring manual intervention. The biasing spring automatically returns the inertial lock to its engaged position after deceleration, making the system self-regulating and eliminating the need for additional control systems or user action.
2Object-affected harmful factors
If a spring-loaded cam inertial lock is used to prevent armrest movement during impact, then passenger safety is improved, but manufacturing complexity increases
Solution Approach 1:
The inertial lock mechanism transitions between static and dynamic states based on vehicle deceleration. During normal operation, the lock remains in a static engaged position. During sudden deceleration, inertial forces activate the cam mechanism dynamically to engage the retention pin, providing impact protection only when needed while maintaining ease of manufacture through simple mechanical components.
Solution Approach 2:
The biasing spring modifies the force parameters of the inertial lock mechanism, allowing it to remain in an engaged state during normal vibration and movement while automatically disengaging during sudden deceleration events. This parameter change approach enables the system to distinguish between normal operation and impact conditions using simple mechanical force thresholds.
3Ease of operation
If the inertial lock is biased distal from the guide slot during normal operation, then ease of operation is improved, but reliability during deceleration may be compromised
Solution Approach 1:
The biasing spring is pre-loaded to maintain the inertial lock in a position biased distal from the guide slot during normal operation, preventing accidental engagement. This preliminary positioning ensures the armrest can move freely during normal use while the spring maintains readiness to engage the lock when deceleration forces exceed a certain threshold, balancing operational ease with safety reliability.
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
Effectively secures the armrest in its position during sudden deceleration or impact, enhancing passenger safety and comfort by preventing unintended movement, while minimizing noise through controlled engagement mechanisms.
Implementation Method 1
a biasing mechanism exerts a return biasing force that biases the inertial lock into an idle position distal from the guide slot
Implementation Method 2
When the opposing directional force overcomes the return biasing force, the inertial lock rotates to a deployed position wherein the inertial lock blocks the armrest frame from operating through the guide slot
Data Source
AI summary
A vehicle seating assembly includes an armrest having a retention pin and operable about a first pivot. An inertial lock is operable about a second pivot to define an idle position defined by the inertial lock biased distal from the retention pin and a deployed position defined by an opposing directional force biasing the inertial lock into selective engagement with the retention pin and holding the armrest in a predetermined rotational position.