(57) A roller shutter device has a plurality of slats (2), sliding between two uprights
(30), each thereof consisting of a tubular section bar provided with a longitudinal
opening (30a), between an opening condition, wherein the slats (2) are wound round
a revolving shaft, and a closing condition, wherein the slats (2) are unwound from
the revolving shaft. The ends of each slat (2) engage almost entirely the longitudinal
opening (30a) of each upright (30) in order to reduce the clearance therebetween,
and they comprise hooking means (7) fit to slidingly bear against abutment surfaces
(30b) of respective upright (30) in order to prevent the slat (2) from coming out
from said upright (30). The slats (2) include a fin element (3), which has an extended
flat shape and is rotatably on a respective longitudinal axis by rotating means (20).
The fin element (3), in the closing condition of device (1), is rotated by the rotating
means (20) between a shut condition (T) and a rotated condition (R), wherein said
fin element (3) is positioned respectively almost coplanar and rotated with respect
to the respective slat (2).
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