(57) A vertical blind (2) rail having an elongate channel (6) including a base wall (12)
extending widthwise in a first direction between first and second base edges (14,16),
first and second side walls (18,20) extending respectively from the first and second
base edges to respectively first and second side edges (22,24) in a second direction
generally perpendicular to said first direction, first and second inturned flanges
(26,28) extending inwardly in generally said first direction from the first and second
side edges respectively so as to define a slot (30) therebetween, wherein the vertical
blind rail is formed by roll-forming a first elongate sheet into a cross-section partly
conforming to the cross-section of an inner channel (10) of the blind rail, roll-forming
a second elongate sheet into a cross-section partly conforming to the cross-section
of an outer channel (8) of the blind rail, feeding the partly roll-formed first sheet
for the inner channel into the partly roll-formed second sheet for the outer channel,
and roll-forming the first and second sheets together to form the blind rail (Figure
2).
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