Abstract: A movable fall-preventing device (1) for a belay support (6) includes an axis-retaining groove which retains the belay support (6) by means of a lever (16) that pivots between an open position and a closed position. One end of the lever comprises a locking cam and the other end is provided with a hole intended to receive a snap hook (5). An end stop system limits the pivoting movement of the lever (16) in an intermediary position when switching from the closed position to the open position. The end stop system comprises a retractable, movable stop (50).

Abstract: A movable fall-preventing device (1) for a belay support (6) includes an axis-retaining groove which retains the belay support (6) by means of a lever (16) that pivots between an open position and a closed position. One end of the lever comprises a locking cam and the other end is provided with a hole intended to receive a snap hook (5). An end stop system limits the pivoting movement of the lever (16) in an intermediary position when switching from the closed position to the open position. The end stop system comprises a retractable, movable stop (50).

Abstract: A principal guide-plate (12a) is bent adjacent a first edge (13a) to define a retention groove (9) extending along an axis (y,y'). A secondary guide-plate (12b) is mounted parallel to the principal guide-plate with a first edge (13b) disposed parallel to and spaced from the principal guide plate first edge. A lever (16) is pivotally mounted (21) between the guide plates. The lever defines a cam surface (26) and a locking surface (25) for engaging a safety line (6) disposed in the retention groove. The lever has an aperture (23) at a second end for receiving a safety catch (5). The guide plates define a lower surface (17a, 17b) with a smaller radius (R1) and an upper surface (18a, 18b) with a larger radius (R2). A radial stop surface (20a, 20b) extends between the upper and lower arcuate surfaces to engage the safety-catch and prevent the lever from pivoting from a closed position (FIG. 10) in which the locking surface engages the safety line toward an intermediate position (FIG. 9) and an open position (FIG.