Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B1/00—Devices for lowering persons from buildings or the like
  • A62B1/06—Devices for lowering persons from buildings or the like by making use of rope-lowering devices
  • A62B1/08—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brake mechanisms for the winches or pulleys
  • A62B1/10—Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brake mechanisms for the winches or pulleys mechanically operated

Definitions

• the invention relates to a fall arrest safety device for a person roped by means of a rope passing through the groove of a pulley, comprising a centrifugal braking system housed in a yoke and driven by the pulley.
• the rope is put in place before closing the screed.
• the replacement of the rope without opening the yoke is difficult and sometimes impossible, when, for example, the rope has a loop at each end to attach a harness.
• the centrifugal braking system causes a heating that affects the entire content of the yoke and in particular the pulley driven by the rope.
• An object of the invention is to provide a fall arrest safety device which does not have these disadvantages, which allows the reattachment of the rope in a simple and fast way, which causes the early operation of the braking system in case of a fall, and which ensures a good dissipation of the heat.
• the invention relates to a fall arrest safety device, for a person roped by means of a rope passing through the groove of a pulley, comprising a centrifugal braking system housed in a yoke and driven by the pulley, characterized in that the pulley is located outside the yoke and able to receive the rope in a loop.
• the yoke comprises two parallel metal flanges, a front flange and a rear flange, the pulley being disposed in front of the front flange.
• two rope guiding means are disposed under said pulley, and sufficiently spaced so that the rope, presented in a loop, is insertable between said two guide means.
• said guide means are mounted on an articulated arm on the front flange.
• the front flange carries an articulated flap, adapted to be secured to said arm to ensure the maintenance of said arm in the operating position, and the protection of the pulley.
• two secondary pulleys are arranged symmetrically above said pulley, to receive the rope before said pulley.
• each of the secondary pulleys is mounted on an eccentric pivot and biased towards the other secondary pulley by a spring.
• said pulley comprises two fixed cheeks with respect to the yoke, a rotating outer ring driven by the rope, said ring having an internal toothing, a central gear driving the centrifugal braking system, and between the outer ring and the central gear, planet gears fixed axis relative to said cheeks, meshing with both the outer ring and the central gear.
• the pulley has a groove for receiving the rope, said groove being provided with a notch.
• FIG. 1 is a front view of a first embodiment of a security device according to the invention, before the introduction of the rope,
• FIG. 2 is a front view of a second embodiment of a security device according to the invention after the introduction of the rope
• FIG. 2 is a right view of the security apparatus of FIG. 2
• FIG. 4 is a schematic view of an exemplary embodiment of the central pulley
• - fig. 5 is a radial sectional view of the groove of the central pulley receiving the rope.
• FIG. 6 is a front view of a third embodiment of a security device according to the invention.
• the fall protection apparatus 1 comprises a yoke consisting of two parallel flanges, a front flange 3 and a rear flange 3 ', and a casing 12 (FIG 3) containing the centrifugal braking system.
• This braking system is of the conventional type, notched hub, with two annular sector masses connected by springs, and friction linings against a fixed outer drum in the yoke.
• the flanges 3 and 3 ' are preferably aluminum to act as a radiator because the friction of the linings on the drum causes a heating that should be dissipated.
• Anchor rings 2 are arranged between the flanges 3, 3 ', at their upper part, to ensure the attachment of the apparatus 1 on a fixed point.
• a drive shaft 4 of the braking system In the center of the yoke, perpendicularly to the flanges, is disposed a drive shaft 4 of the braking system.
• the shaft 4 is integral with the hub of the braking system.
• a central pulley 5 is placed outside the yoke, in front of the front flange 3, centered on the shaft 4 which it is secured.
• the central pulley 5 is intended to receive the rope 6 presented in a loop and not by one of its ends.
• rope guide means which are for example fixed axes or pulleys, and in the embodiment shown, two small pulleys 9 for guiding the rope 6.
• These guide pulleys 9 are mounted idle on axes perpendicular to the front flange 3 and fixed to the front flange 3.
• a guard plate 1 1 is mounted integral with the axes of the guide pulleys 9.
• the guide pulleys 9 are spaced from one another to allow the passage of the rope 6 in a tight loop, on the one hand, between the guide pulleys 9, on the other hand between the front flange 3 and the front plate. guard 1 1. Once this passage made, the loop is open and the rope 6 is put in place in the groove of the central pulley 5, which he occupies the major part.
• the same elements bear the same references as in FIG. 1.
• the axes of the guide pulleys 9 are no longer integral with the front flange 3, and the guard plate 1 1 is carried by an arm 7 articulated on a hinge pin 10 carried by the front flange 3.
• a flap 15 In front of the front flange 3, pulleys 5, 9, and the arm 7 carrying the guard plate January 1, is disposed a flap 15, articulated on an upper support 16 fixed to the front flange 3, by means of a hinge 8 .
• At the lower part of the flap 15 of the guard plate 11 are provided two orifices 13 intended to each receive a peg or a tie for securing the plate 1 1 to the flap 15.
• the ends of the rope 6 are provided with connecting rings to the harness of the roped person, the safety of which is ensured by the apparatus 1.
• the arm 7 is returned to the position of FIG. 2 and the guard plate 11 and the flap 15 are secured.
• the flap 15 serves to protect the pulleys 5 and 9.
• the central pulley 5 has two cheeks 17 fixed with respect to the yoke, an outer ring 18 rotating, driven by the rope 6, and having an internal toothing 21.
• a central gear 1 integral with the shaft 4, and provided with an external toothing 22.
• planet gears 20 preferably in number 3 or 4, each having an external toothing 23 cooperating on the one hand with the internal toothing 21 of the outer ring 18 and on the other hand with the external toothing 22 of the central gear 19.
• the planet gears 20 pivot on fixed axes carried by the fixed cheeks 17 of the central pulley 5. In the event of a fall, the rope 6 is rapidly urged and drives the outer ring 18, the internal toothing 21 of which rotates the planet gears 20, which in turn rotates the central gear 19 at an angular speed substantially greater than that of the outer ring 18.
• the outer ring 18 is made of aluminum, the central gear 19 is of steel, and the planet gears 20 are made of composite material.
• the groove of the central pulley 5 is provided with notches to better cooperate with the rope 6 in case of a fall.
• These notches are arranged on the one hand at the bottom of the groove, 24, on the other hand on the sides of the groove, 25.
• the notches 25 of the groove flanks are arranged in pairs facing each other, and the notches 24 of the groove bottom between two pairs of notches 25 of groove flank.
• the notch of the groove of the central pulley 5 is achieved by radial milling at regular intervals of the bottom of the groove.
• two secondary pulleys 26 are arranged symmetrically above the central pulley 5, between the front flange 3 and a holding plate 27.
• the rope 6 is presented in a tight loop between the axes 9, under the 1 1 guard plate, then the loop is open to pass around the secondary pulleys 26 and the holding plate 27, then a tight loop is reformed to pass between the secondary pulleys 26 under the holding plate 27, and finally the loop is open and the rope 6 is put in place in the groove of the central pulley 5.
• each of the two secondary pulleys 26 is mounted on an eccentric pivot 28, and has a circular arcuate lumen 29 centered on the pivot 28.
• a fixed pin 30 In the lumen 29 is disposed a fixed pin 30 and between this pin 30 and the edge of the light the closest to the vertical axis passing through the center of the central pulley 5, is disposed a spring 31 which tends to bring the secondary beams 26 towards each other, which increases the length of the rope 6 in contact with the groove of the central pulley 5.

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• 2010
  • 2010-11-16 FR FR1059406A patent/FR2967357B1/fr active Active
• 2011
  • 2011-11-10 EP EP11794810.9A patent/EP2640472A1/de not_active Withdrawn
  • 2011-11-10 WO PCT/FR2011/000603 patent/WO2012066196A1/fr active Application Filing

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