Patent ID: 6814129
Filing Date: 2004-11-09
Classification: E06B,H01H

Abstract:
A motorized roller shutter comprising:(a) an electric drive motor, having a stator connected to a fixed support via an elastic device which exert a retaining force and oppose the rotation of the stator imparted by a torque resistive to movement of the roller shutter between a rolled-up, up position and an unrolled, down position, (b) a stopping device stopping the roller shutter in the rolled-up and unrolled positions; and (c) means for controlling the stopping of the motor in the rolled-up and unrolled positions comprising at least one switch, actuated by the rotation of the stator which takes place when the resistive torque exceeds a retaining torque exerted by the elastic device, characterized in that: (i) the elastic device comprises two springs working in compression between two moving compression elements driven in turn by an element of the stator which acts on the compression elements as the stator rotates in each rotational directions, (ii) the distance from a rest position to be covered by the compression element being driven before one of the springs is compressed, exceeds the distance to be covered by the compression element being driven before the other spring is compressed, and (iii) the stopping device comprises a moving actuating part mechanically linked to the stator, the moving actuating part drives the compression elements and actuates the switch after a predetermined amount of travel, the amount of travel differing for each direction of rotation of the stator and means for reversing said amount of travel.