Rollover protection system for vehicles comprising a deployable arch combined with a headrest

The rollover protection system has a rollover protection body, deployed under control of a sensor, combined with the adjustable headrest (4,5,6) of each passenger seat, a releasable latch (13,14) securing the rollover protection body and a releasable locking device (10,11) securing the headrest in its adjusted position. A rotatable release lever (8) controlling the rotation of 2 lever arms (16,17), respectively used for release of the latch and the locking device.