(57) A security device (1), particularly for doors or window closure elements, comprising
a series of links (2, 2a, 2b, 2c) arranged side by side and mutually articulated and
adapted to be wrapped around a roller (3) that can rotate and be blocked selectively.
The roller (3) can rotate about its own axis to move a door or window closure element
(4) that in turn can be rigidly associated with an end link (2a) of the series of
links (2, 2a, 2b, 2c). When the roller (3) is blocked, the links (2) interposed between
the end link (2a) and an adjustment link (2b) connected to the roller (3) are arranged,
following an unwanted lifting of the door or window closure element (4), in a configuration
for blocking by geometric interference and friction of the translational motion thereof.
The security device (1) comprises means (5) for selective coupling of the roller (3)
to one of a plurality of links (2, 2a, 2b, 2c), the link (2, 2a, 2b, 2c) chosen for
coupling forming the adjustment link (2b).
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