1. The fall arrest device for overhead doors of the type associated to a suspension cable (17) connected to the counterweight of the door, as well as incorporating a bolt (6) associated with the side door in which fit rotation means (9) rolling on the guide (20) of the door during the movement thereof, comprising: - two plates (1) parallel linked and to the suspension cable (17) including a groove upper (12) and a lower groove (12 '') in which are respectively the bolt (6) and the axes of a roller (3), - a plate (2) located between the two plates (1) which has an upper groove (21) in which you are located the bolt (6) and a lower groove (21 '') which is the roller (3), - an at least partially toothed disc (4, 4 ' ') in eccentric arrangement relative to the ends of the roller (3) in which respective articulated located between stops oblique (13, 13 '), - a spring (5) housed in a longitudinal bore (22) formed in the plate (2) is held compressed between the bolt (6) and the roller (3) during operation normal door and expands to the fall of the strips in case of breakage of supporting cable (17) determining the lowering of the roller (3) and the consequent push of the oblique stop (13-13 '') on the discs (4-4 '') for their teeth with respect to the plates (1) and locking in the guide (20).
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