Locking system preventing roller shutter door from being opened - allows horizontal linked slats to hook behind blocking stops in profiled guides at sides

摘要

The blocking system allows the shutter's slats to piVot about their linkage axes. The shutter is guided at its sides by profiling resembling a periodic wave with blocking steps. The shutter falls under its own weight, sliding smoothly over the wave. When its bottom edge reaches the ground, the slats pivot into a zig-zag with the pivot axes beneath the blocking steps. Lifting the bottom slat pushes the pivot axes against the steps and will not raise the shutter. Raising the top slat pulls the axes away from the steps and the shutter can be raised.