VERTICAL DROP VENT WINDOW SYSTEM

A window regulator mechanism for raising and lowering in a window opening in a vehicle body structure a window panel vertically divided into a ventilation section and a visibility section. The window regulator mechanism may be manually or power operated to function to raise or lower both panel sections in controlled sequence. With the window panel in raised condition, actuation of the window regulator mechanism results in the ventilation or smaller panel section being lowered into the body structure to provide a ventilation exhaust opening. During the travel of the ventilation section into the body structure, the visibility or larger panel section remains locked in a fully raised position by a latch mechanism. When the smaller panel section reaches a predetermined down position, the latch mechanism is released allowing the larger panel section to travel to a full down position. Upon movement of the window panel from its lowered position to a raised position, a reverse sequence occurs during which the larger panel section again first becomes locked in a fully raised position as the smaller panel section continues to move out of the body structure into its fully raised position.