(57) The supporting structure comprises a sectional member (1) formed, at the bottom thereof,
with hollow shaped seat (2) for retention of runners (3) and sliding movements, in
separate guides, of two lengths of the curtain control string (7), and having atthetop
a laterally open seat (9) defined by a flat wing and a slightly crowned wing defining,
in cooperation with the edge of a front rib, a retention dog (11) for a supporting
plate (13) having a grooved elastic tab (12), the sectional member being arranged
to cooperate with two box-like bodies (16), each carrying at least one pair of deflector
rollers (17).
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