| 摘要 |
<p>The invention concerns a fall prevention safety device for a sectional door moving along lateral guide tracks associated with fixed supporting doorposts and controlled by means of normally taut draw cables. Along each supporting doorpost knurling or toothing is provided (21), and at the bottom part, on the sides of the door, is assembled a stop element (22) connected to a respective draw cable (16) and having at least one toothed zone the toothing of which faces towards said knurling or toothing along an adjacent supporting doorpost. The stop element moves between an inoperative position, in which its toothed area is kept at a distance from said knurling or toothing when the cable connected to it is integral and taut, and a block operating position, in which its toothed area made to approach and automatically engage with the knurling or toothing when the cable it is connected to snaps, is slack or is disconnected.
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