Cord drive or similar for a roller shutter

摘要

The window shutter drive comprises a pulley (3) around which the cord is wound. The pulley rotates integrally with a drive shaft driving the shutter winding shaft through a reduction gear. A torque limiter (9,10) ensures declutching of the drive by the pulley beyond a specified resisting torque produced by the winding shaft. The torque limiter consists of an intermediate hub (8) rotating with the driving shaft. The pulley is mounted on this hub which is provided with driving blades (9) driving complementary sections (10) connected to the hub. These resilient blades are able to fold under the effect of a specified resistance to driving to allow free rotation of the pulley relative to the intermediate hub.