Gearing with worm gear for roller shutter

摘要

The gear has a toothed wheel driven by a cylindrical worm gear (2) and connected to a rolling tube of a shutter by rigid fasteners. The rotation of a screw is controlled by a control rod (7) connected to a crank. The worm gear moves towards a compartment (6) of a casing (1) when turned by actuating a descent of the shutter and when a wheel gear (3) does not turn in this direction.