Fold-and-Dive Seat Linkage Locking Against Submarine Phenomenon

The hinge mechanism is designed to be dynamic rather than static - it provides free rotation during normal operations (fold and dive) but automatically engages a locking function during collision. The stopper link rotates from an initial position to a locked position based on inertial force, transforming the hinge from a purely rotational joint to a conditional locked joint that adapts to different operational states.

The stopping mechanism is self-activating through inertial force during collision without requiring external control systems. The stopper link automatically rotates and engages the locking protrusion with the locking groove when collision occurs, and the return spring automatically resets the mechanism after collision. This self-service特性 eliminates the need for sensors, actuators, or control electronics while maintaining reliability.

The stopper link is pre-positioned and pre-loaded with the return spring before collision occurs. When collision happens, the inertial force immediately activates the stopping function without delay. The mechanism is prepared in advance to prevent the harmful downward movement of the seat cushion front end while still allowing controlled energy absorption through the hinge's initial rotation.

The stopper link acts as an intermediary element between the hinge mechanism and the dive link. It translates the inertial force from collision into a locking action that prevents excessive rotation of the dive link. This intermediary component mediates between the need for energy absorption (allowing some rotation) and the need to prevent submarine phenomenon (limiting rotation), achieving a balanced solution.