Abstract: In a window opener, for instance for automotive vehicles, consisting of a toggle lever joint (1) which is mounted for movement on both sides and has a toggle lever joint (2) as well as levers (3, 4), with a detent mechanism having a detent disk which is mounted for axial displacement and can be disengaged against spring pressure and has detent elements distributed on its circumference, a high holding force of the detent mechanism (7) and nevertheless actuation of the window opener without great application of force or demands on the concentration of the user as well as considerable protection from injury are obtained by a grip which receives the detent mechanism (7) and consists of two grip arms (8, 9) protruding on both sides from one of the levers in the direction of the axis of the toggle joint (2), as well as a push button (11) arranged in one of the grip arms for the disengagement of the detent disk (15); two axially displaceably mounted detent disks (15, 15') which are disengageable against the same spr