Multi-stage window covering e.g Venetian blind has several winding mechanisms including hanging cord that is connected to respective juxtaposed covering units for controlling movement of covering units independently

摘要

The window covering has several juxtaposed covering units (2) and winding mechanisms (11) mounted on a headrail (1). Each winding mechanisms includes a hanging cord (111) connected to a respective one of the covering units for controlling movement of the covering units independently, so that the covering zones formed by the covering units have different optical permeability to allow passage of solar rays.