IMPROVEMENTS IN CONSTRUCTION FOR SPRING DRUM ROLLER BLINDS, CURTAINS AND SIMILAR ROLLING

摘要

Improvements in the construction of spring drums for roller shutters, roller or the like curtains, in which on the drum shaft are subject two or more spring elements, of which each consists of a coil spring shaped strip, characterized because the coil springs are subject each with its outer end in a separate ring, as these rings are provided with fastening means for mutual attachment to form a drum and at least one ring is subject to a fixed part .