Roller shutter with driving device actuated by rotation and coil spring torque limiting means

摘要

The drive for a roller shutter has a force limiter (12) has two sections (23,24) mounted coaxially to be actuated by a shaft and connected to a return drive (13,14). A helical spring (25) has one end connected to one section (23) of the limiter and its coils surround the other section (24). The two sections and the spring can move relatively without friction when an excess force is exerted on the drive.