a window frame;

a sash frame which accommodates a panel made of armored glass, said sash frame being mounted on hinges on the window frame, so as to be tiltable around at least one axis, the sash frame nesting in the window frame in a closed position;

at least one tilt-limiting element that limits explosion-induced tilting of the sash frame in the hinges beyond a tilt-limit position; and

at least one shift-limiting element that resists detonation-induced shifting of the sash frame perpendicular to a tilt axis in the hinges,

wherein the tilt limiting element comprises a safety scissors mechanism that has been strengthened, said scissors mechanism being mounted in the window frame and in the sash frame, with the safety scissors mechanism engaging with a pin in a hollow profile which is rigidly connected to a steel filling incorporated in the sash frame, said hollow profile and steel filling being displaceable together relative to the sash frame in a direction parallel to the tilt axis of said sash frame; and

wherein a nose is formed on a side of the sash frame facing the tilt axis, which nose, in the tilt limiting position of the window frame, engages from behind with a female coupling connected to the window frame such that said nose prevents movement of the sash frame in a direction substantially parallel to the plane of the panel and perpendicular to the tilt axis.