Abstract: A method for altering the spring constant (k) of a torsion spring for a roller blind, the method including (i) locating a dampener at a predetermined length along a longitudinal axis of the torsion spring, and (ii) tightening an end of the torsion spring against the dampener to increase the spring constant. Further disclosed is a roller blind system having a cylinder, a fabric attached to the cylinder for winding and unwinding from said cylinder, a torsion spring and a damper moveable along the longitudinal axis of the spring.

Abstract: The invention relates to coupling at least two window coverings and, provides apparatus for coupling a first and second window covering in substantially coaxial alignment comprising the combination of a bracket and a bearing insert, where: the bracket comprises at least one first portion adapted for fixing the bracket to a structure and a second portion comprising a combination of one or more generally C-shaped apertures; the bearing insert comprises a generally annular assembly with first and second side portions secured together by a hub portion, the hub portion having an outer surface configured as a truncated circle, wherein the truncated circle configuration of the hub portion is adapted to allow passage of the bearing insert into the C-shaped aperture and prevent passage out of the C-shaped aperture upon rotation of the bearing insert in the C-shaped aperture.

Abstract: The invention relates to coupling at least two window coverings and, provides apparatus for coupling a first and second window covering in substantially coaxial alignment comprising the combination of a bracket and a bearing insert, where: the bracket comprises at least one first portion adapted for fixing the bracket to a structure and a second portion comprising a combination of one or more generally C-shaped apertures; the bearing insert comprises a generally annular assembly with first and second side portions secured together by a hub portion, the hub portion having an outer surface configured as a truncated circle, wherein the truncated circle configuration of the hub portion is adapted to allow passage of the bearing insert into the C-shaped aperture and pre vent passage out of the C-shaped aperture upon rotation of the bearing insert in the C-shaped aperture