(57) Pleated sheet mosquito net (1) comprises a pleated sheet (2) having upper and lower
ends (3, 4) and side edges, and vertical guiding rails (35, 36) adapted to receive
side edges of the pleated sheet (2). The upper and lower ends (3, 4) of the pleated
sheet (2) are connected to upper and lower boxes (5, 6) respectively, the lateral
ends of the boxes (5, 6) being received, in the same way of the side edges of the
pleated sheet (2), in vertical guiding rails (35, 36). A raising and lowering device
able to raise and lower the pleated sheet (2), comprises a plurality of driving cords
(14) joined to the lower box (6), passing along vertical and horizontal paths through
corresponding holes in the pleated sheet (2), concurrent to a cord lock device (15)
situated in the upper box (5) and linked to a manual control line (170).
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