Abstract: The invention provides an improved roller shutter assembly 10 including a cylindrical core 12 having end blocks 14 rigidly located at each end. At least one end block is provided with a mounting block 16 rotated mounted in a hole 20 in the end block 14. Provided between the mounting block 16 and the end block 14 is an annular space 32 which encloses a coiled spring 30. One end of the spring 30 is attached to the end block 14 and the other end to the mounting block 16. Thus as the blocks are rotated with respect to each other the spring is tensioned to provde a counteracting spring force to aid rewinding. Enclosure of the spring at the end blocks provides for easy maintenance and simplified construction. Each end block 14 may be provided with springs if desired. In a further embodiment the end block 14 is provided with an external peripheral cam shaped surface so as to facilitate even winding of a slatted blind.

Abstract: A bi-parting shutter system having two slidably displaceable shutters connected by a flexible belt arranged in a track and looped around two freely rotatable pulley wheels. The belt defines a first belt run connected to a first shutter by a first attachment, and a second belt run similarly connected to a second shutter by a second attachment. The second attachment includes a bracket having a generally hollow square cross section and located in the track. The first belt run freely passes through the second attachment, with movement of one shutter being transmitted to the other shutter.