(57) Safety device (10) for a sectional closing element (26) comprising a plurality of
sections or panels (11) that cooperate longitudinally with each other. Each panel
(11) includes slider elements (12) that slide along a sliding axis (X) in mating guides
(13). The device (10) includes a pair of rolling members (14) that lie on the sliding
axis (X) and are associated with respective frames (15, 16) pivoted together at a
central pivoting point (P) normally offset with respect to the sliding axis (X). The
frames (15, 16) can oscillate from a first position wherein the rolling members (14)
are near each other, and a second position wherein the rolling members (14) are distant
from each other. The passage from the first position to the second position is activated
by the breaking of the drive elements (20). A stop element (22) associated with a
frame (15, 16) acts against the guides (13) when the frames (15, 16) move towards
the second position, in order to block the displacement of the closing element (26).
An elastic member (24) is provided to take the frames (15, 16) into the second position.
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