Curtain with coiled spring

The roller blind (1) consists of a tube (2) on which the blind is rolled, rotating on a fixed central shaft (3), with coiled strip springs (5, 6) to return the blind to its rolled position when released. The springs are located inside the tube, with their outer and inner ends bent over and fixed respectively to slots (15, 16) in the tube and shaft. Bearings (8) on the ends of the tube enable it to rotated about the shaft.