Transparent security shutter

Transparent security shutter (1), of the type that can be wound about a drum arranged at the top thereof, said shutter, when it is lowered and closed, enabling a shop window or a storefront for example, or also a window or a patio-door of a residential building, to be protected against vandalism and burglary, without affecting its visibility, said shutter being constituted of a plurality of transparent slats (3) arranged horizontally on top of one another, and each connected to the immediately higher slat (3) by means of two profiles (4, 5) with engaged matching sections, that simultaneously constitute a bolt and a horizontal articulation axis for the two slats (3) in question, wherein the shutter is furthermore of the type in which the slats (3) are inserted between the profiles (4, 5) and wherein the profiles and/or the slats slide at each of their two extremities in a vertical lateral slide or guide rail (6) fastened to the woodwork (6′) that delimits the window or storefront to be protected, and being characterized in that each of its slats (3) is made up of a plurality of I-section modules (7, 12) assembled two-by-two in a laterally overlapping fashion, wherein the top (20) and bottom (21) flanges of said modules being inserted by sliding with a slight play between two opposing rails (22, 23), provided on the surfaces of the profiles (4, 5) opposite the locking surfaces thereof, and in that each extremal module of each slat (3) ends in a breakable fixing peg (27).