Inertial Lockout Mechanism for Vehicle Console Latch
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Solution Overview
Problem
Console covers in vehicles can unlock during a collision event due to inertia, posing a safety risk as contents may become projectiles within the vehicle interior.
Innovation Solution
A locking device with a latch mechanism and inertial lockout mechanism, featuring a latch pawl biased by compression springs and a catch mechanism that engages under inertia to maintain the console cover in a locked position during collisions, utilizing a rocker mechanism and differential spring stiffness to ensure engagement with the latch pawl.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional latch mechanism is used for the console cover, then the cover can be easily opened and closed by the user, but the latch may unintentionally disengage during collision events due to inertial forces
Solution Approach 1:
The patent introduces a catch mechanism as an intermediary component between the latch pawl and the external forces. This catch mechanism acts as a mediator that selectively engages with the latch pawl to prevent inertial disengagement during collisions while allowing normal user-operated opening and closing. The catch mechanism includes a catch pawl that can engage the latch pawl's retention surface, creating an additional locking layer that doesn't interfere with regular operation.
Solution Approach 2:
The patent utilizes spring force parameters to create different engagement characteristics. A first spring biases the latch pawl toward the locked position, while a second spring biases the catch mechanism. The differential spring forces are calibrated so that normal operational forces can overcome the latch spring for opening/closing, but collision-induced inertial forces exceed the catch spring force, causing the catch to engage and lock the latch in place.
2Reliability
If the latch mechanism is made more secure to prevent collision disengagement, then reliability during collisions improves, but ease of operation by the user deteriorates
Solution Approach 1:
The catch mechanism is designed to be dynamic rather than static. It can transition between engaged and disengaged states based on the forces applied to the system. During normal operation, the catch remains disengaged, allowing free latch movement. During collision events, the inertial forces cause the catch to engage automatically, providing conditional security without permanent restriction of movement.
Solution Approach 2:
The catch mechanism operates autonomously based on the physical conditions of the system. It self-activates during collision events through inertial forces without requiring user input or external control systems. The mechanism automatically engages to prevent unwanted opening and returns to its disengaged state when normal conditions resume, providing self-regulating security.
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 locking device effectively retains the console cover in a locked position during collision events, preventing the console from opening and reducing the risk of contents becoming projectiles, by leveraging the force of inertia to engage the catch mechanism and maintain the latch pawl's locked position.
Implementation Method 1
A first compression spring is adept to bias the latch pawl to the locked position when at rest
Implementation Method 2
A second compression spring is coupled to the armrest housing and is adapted to bias the catch mechanism to the noninterference position
Implementation Method 3
The compression stiffness of the second compression spring is configured to be overcome by the force of inertia during a collision event, such that the catch mechanism disengages with the second compression spring and pivots to the interference position
Implementation Method 4
The rocker mechanism is pivotably coupled to an armrest housing, and the rocker mechanism is gravitationally predisposed to an interference position
Data Source
AI summary
An inertial lockout mechanism is coupled to a latch mechanism, such that, during a collision event, the inertial lockout mechanism will move to an interference position such that the latch mechanism will be retained in a locked position as an inertial force is realized on the latch mechanism. Specifically tailored compression spring configurations ensure that the inertial lockout mechanism will move to the interference position before the latch mechanism can move to the unlocked position.


