Abstract: A shutter curtain lifting prevention structure comprises a shutter curtain formed by connecting a plurality of slats via an interlock portion in the vertical direction, guide rails standing on both sides of an opening of the construction, and a cutout recess being integrally formed at the guide groove of each guide rail. The cutout recess is formed by horizontally cutting out the interior side plane portion of the front face located above and in the vicinity of the floor surface, such that when a bottom plate of the shutter curtain kept in a shut state is lifted, a connection portion of the bottom plate and the slat, which is opposed to the cutout recess is made engaged by the engaging portion defined by the cutout recess, thus preventing lifting of the shutter curtain.

Abstract: An opening and closing device for an architectural rolling door is provided in which various parts of the device are assembled into a cylindrical-shaped casing with good work efficiency and without looseness. After a casing (6) is divided into upper and lower semi-cylindrical parts (9, 10) and various parts, such as an electric motor (12), of the device are assembled into the lower semi-cylindrical part (10), the upper semi-cylindrical part(9) is slidingly fitted into and assembled to the lower part (10) and flange portions (9c, 10d) on the upper and the lower parts (9, 10) in this state are clamped to each other and fixed in a state in which the casing (6) is made small in diameter.

Abstract: A device for preventing a shutter curtain from falling by its own weight and allowing the shutter curtain to descend in a braked manner, is provided such that separate space for the device does not need to be provided.A viscous clutch 9, which provides braking to the rotation of a winding shaft rotating in the direction of closing during the shutter curtain 2 descending by its own weight, is provided between the winding shaft 7 and a bracket 5 of the building. Further, the viscous clutch is arranged to be smaller in diameter than the innermost inner diameter of the shutter curtain wound onto the winding wheel 4, thus fitting within the wound shutter.