Spring system for roller blinds

摘要

603055 Disclosed is a spring assist module for a window covering or roller blind including a stationary carrier connectable to an operating member of the window covering; at least one helically wound torsion spring having a first and a second spring end; at least one rotatable member to be keyed to a driven part of the window covering, such that rotation of the driven part rotates the rotatable member; and the torsion spring having a first end operatively coupled to the stationary carrier and a second end operatively coupled to the rotatable member. Upon rotation of the rotatable member in one direction of rotation kinetic energy may be stored by the torsion spring from the rotatable member and upon rotation of the rotatable member in an opposite direction of rotation any kinetic energy stored by the torsion spring may be released to the rotatable member and wherein the spring assist module is pre-assembled as a self-contained unit.