(57) A blind apparatus comprising at least two tracks having adjacent ends meeting at
a corner defined there between, the tracks defining two opposite ends remote from
such corner, a rotation shaft for each track, a lead traveller in each track, moving
along a lead traveller path of predetermined length from an open position at one end
of the path to a closed position at the other end of the path, pluralities of travellers,
forming groups, associated with respective lead travellers, each traveller having
a rotatable slat shaft and being connected to a rotation shaft whereby upon rotation
of the rotation shaft, the slat shaft may be rotated, adjacent travellers in the same
group being connected by links, each lead traveller being connected to an adjacent
traveller in its respective group by a further link, a flexible control element attachable
to the lead travellers, and, a flexible coupling connecting adjacent rotation shafts
at the corner, with all lead travellers being movable simultaneously along respective
paths by the flexible control element.
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