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EP1466650A1 - Lifeline with fall absorber - Google Patents

Lifeline with fall absorber Download PDF

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Publication number
EP1466650A1
EP1466650A1 EP04290919A EP04290919A EP1466650A1 EP 1466650 A1 EP1466650 A1 EP 1466650A1 EP 04290919 A EP04290919 A EP 04290919A EP 04290919 A EP04290919 A EP 04290919A EP 1466650 A1 EP1466650 A1 EP 1466650A1
Authority
EP
European Patent Office
Prior art keywords
cable
rod
lifeline
spring
link
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04290919A
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German (de)
French (fr)
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EP1466650B1 (en
Inventor
Richard Lebraut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ateliers LR Etanco SAS
Original Assignee
Lebraut Ronan
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Filing date
Publication date
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Publication of EP1466650A1 publication Critical patent/EP1466650A1/en
Application granted granted Critical
Publication of EP1466650B1 publication Critical patent/EP1466650B1/en
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/0043—Lifelines, lanyards, and anchors therefore
    • A62B35/005—Vertical lifelines
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means

Definitions

  • the present invention relates to a lifeline with fall arrestor.
  • each person present on the cover and equipped with a harness can hang on this cable thanks to a link (for example a lanyard or strap) connected on one side to the harness (or harness) and, on the other side, a carabiner that can be mounted on the cable and slide along it.
  • a link for example a lanyard or strap
  • the length of this link is determined by standards based on roof dimensions.
  • connection between the link and the harness or the harness is made in the region backbone of it.
  • the invention therefore more particularly aims to remove these disadvantages.
  • a damping device comprising elastic means subjected to the forces of pulling said cable and / or said link and retention means making it possible to make the deformation of the elastic means caused by said remanent efforts, beyond a predetermined effort threshold, as well as allowing the elastic means to be returned to their initial position after that they have undergone a residual deformation.
  • the above elastic means may consist of a helical spring capable of linear deformation depending on traction exercised by the above cable or the above link, while the above means of retention may consist of a rack system integral with one of the ends of the spring, this rack system comprising notches cooperating with a snap secured to the other end of the spring.
  • the return of the spring to its original position can be obtained by exerting an action on the snap to release the rack.
  • the above rack system may include a wolf tooth helical thread rod cooperating with pawls so that, during a deformation of the spring caused by a traction of the cable, there is a relative displacement between the rod and the pawls (which slide on the slightly inclined fronts of the net) and that, when this traction ceases, the spring is held in its position thanks to engaging the pawls on the net (the pawls abutting on the front steep of the net).
  • This solution has the advantage of allowing the spring to be brought back to its original position by a simple relative rotation between the rod and the pawls: this operation can be carried out without causing a sudden return of the spring and therefore harmless. In addition, it ensures the initial tension of the cable, which avoids having to use a cable tensioner.
  • the lifeline 1 consists of a steel cable 2 stretched between two anchoring elements 3, 4 by means of a classic cable tensioner 5 (located between one of its ends 6 and the element 3).
  • This lifeline 1 further comprises a damper 7 mounted between the other end 8 of cable 2 and the other anchoring element 4, as well as elements holding and guiding 9 of the cable arranged at regular intervals (for example every 5 m).
  • the anchoring elements 3, 4 are fixed to the top of a roof 10, so that the cable 2 extends parallel and close ridge 11.
  • the position of these anchoring elements 3, 4 by relationship to the edges and gables of the roof must comply with safety regulations in force.
  • Cable 2 is intended to receive carabiners 12 connected to links insurance (lanyards, belts or ropes), themselves attached to harness 13 or harnesses worn by people working on the roof. These carabiners 12 can therefore slide along the cable 2 so as to allow these people to move parallel to the ridge 12 while remaining insured.
  • links insurance lanyards, belts or ropes
  • the anchoring elements 3, 4 can consist, as illustrated in FIG. 2, of a section of angle iron of which a wing 14 of rectangular shape is provided with a plurality of holes for fixing by screwing the element on a cover, and of which the other wing 15, of substantially triangular shape, is provided, at its top, with a hole 16 intended to allow the fixing of one end of the cable 2 directly or through an accessory such as, for example, the cable tensioner 5 or the shock absorber 7.
  • This triangular wing further comprises two holes 17, 18 allowing securing an additional anchor piece 19 provided with an orifice 20 serving as a fixed anchor point.
  • the holding and guiding elements 9 also consist of sections angle iron having a rectangular fixing wing 21 provided with holes and a trapezoidal wing 22 whose large base is integral with the wing 21, while the small base is extended by two curved tabs of opposite concavities 23, 24. These two tongues 23, 24 which are axially offset define a passage through which the cable 2 can pass as well as the carabiners 12 sliding on cable 2.
  • the cable tensioner 5 used in this example conventionally comprises two coaxial nuts 25, 26 connected to each other by a connecting piece in H shape In each of these nuts 25, 26 are engaged and screwed two respective screws 27, 28, the heads of which consist of yokes of articulation each comprising a transverse axis intended to come to engage in the hole of an anchor element 3, 4 or of a loop formed at cable end 2.
  • the damper 7 consists of a body cylindrical tubular 30 closed on one side by a bottom 31 provided with a bore central 32 in which engages and fixes a hinge yoke 33.
  • this yoke 33 has a U-shaped structure comprising two parallel wings connected by one of its ends by a core axially extended by a threaded rod which engages in orifice 32. The fixing is then obtained by screwing a nut 34 with interposition a washer.
  • the second end of the tubular body is equipped with a bearing 35 in which engages and can slide a rod 36 terminated on one side by a yoke 37 and on the other side by a thread onto which a nut 38 is screwed.
  • the rod comprises a series of annular notches in wolf tooth 39, each comprising, on the bottom side, a stiff front 40 (perpendicular to the axis of the rod 36) and, on the other side, a conical front 41 to relatively gentle slope.
  • These notches 39 are intended to cooperate with a snap comprising at at least one jaw 42 comprising two jaws 43, 44 located on either side of the rod 36 in two diametrically opposite locations.
  • These two jaws 43, 44 each have a rectangular trapezoidal shape whose large base 45, oblique, is located on the rod side and is oriented parallel to the conical face 39 of the notches of the stem while the larger of the two parallel sides 45 '(which extends radially) is intended to serve as a non-return stop for the steep front 40 of a notch.
  • the two jaws 43, 44 are mounted tilting around two axes substantially parallel which extend in a plane perpendicular to the axis of the stem: these two axes here consist of two opposite portions of a hoop annular 46 passing through two corresponding orifices located in the part median of the jaws 43, 44.
  • the two jaws 43, 44 are urged by a rod elastic 47 so that their angular region bounded by the large base 45 and the large side 45 'come to bear on the rod 36.
  • the jaw 42 is axially retained in a space delimited by the bearing 35 and an annular element 48 integral with the wall inside the body 30.
  • the rod 36 is subjected to the action of a helical spring 49 disposed coaxially inside the body 30 around the rod 36 and one of which ends rests on the annular element 48, while the other end is retained by the nut 34 thanks to a washer 50 of outside diameter substantially equal to the internal diameter of the body 30.
  • the end of the rod 36 adjacent to the yoke 37 may include a scale allowing adjustment of the cable tension 2 to the image of a classic dynamometer.
  • the operator acts on the cable tensioner 5 until the cable tension reaches the value desired (indicated on the scale).
  • the rod 36 moves axially by compressing the spring 49.
  • the jaws 43, 44 remain supported on a smooth part of the rod 36 adjacent to the yoke 37.
  • This tension of the cable 2 must be sufficient so that the persons who are there hooked up can do light pull-ups without this resulting in significant deformation of the cable 2 and / or by a snap-fastening of the jaw on a notch of the rod 36.
  • the rod 36 subjected to a tensile force important moves axially.
  • the jaws 43, 44 are successively pushed aside to allow the passage of the notches 39 until the balance of forces is reached. In this case, the jaws 43, 44 close on the rod 36, the long side 45 'abutting on the stiff front 40 of the last notch passed through the jaw 42.
  • damper 7 then remains locked in this position. Therefore, the person victim of the fall does not undergo the brutal force exerted by the spring to return to its original position.
  • this return to position will be provided in the factory using means to prevent the release of the spring is not carried out suddenly by endangering the operators. This release can be obtained by exerting on the jaws 43, 44 an effort to overturn them, thus making them escape from notches 39.
  • orifices 52, 53 may be provided in the body cylindrical 30 to allow this effort to be exerted by means of a special tool.
  • the notched rod can be replaced by a rod 54 with a helical thread 55 wolf tooth (with a steep side and a slightly inclined side).
  • the jaws 43 ', 44' will be specially shaped to cooperate with this filet 55.
  • the functioning of this shock absorber is very similar to the previous one.
  • the return of the rod 54 to its original position after having performed its depreciation function can be simply insured by pivoting the rod 54 relative to the body 30, so as to generate a unscrewing process. We thus obtain a return to the original position without risk for the operator.
  • this yoke may be integral with a threaded rod 56 coming from screw into the bottom 31.
  • this rod 56 By providing for this rod 56 a reverse pitch of that of the rod 54, one thus obtains means for adjusting the tension of the cable whose effects are added to those obtained with the couple jaw 43 ', 44' / rod 54.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Emergency Lowering Means (AREA)

Abstract

The safety line for a steeplejack has a cable (2) tensioned between two anchors (3,4) and the line is fixed at one end to a slide on the cable and at the other end to a safety harness for the user. The cable or line has a damper (7) with elastic springs acting against traction loads on the cable or line. Catches hold the springs in a deformed condition up to a predetermined effort, at which the springs can return to their initial condition.

Description

La présente invention concerne une ligne de vie à amortisseur de chute.The present invention relates to a lifeline with fall arrestor.

D'une manière générale, on sait que dans le but d'assurer la sécurité des personnes travaillant sur une toiture, des normes de sécurité préconisent l'usage de lignes de vie comprenant un câble d'acier tendu entre deux éléments d'ancrage fixés sur la charpente. Ainsi, ce câble est fréquemment installé à demeure parallèlement et à une distance prédéterminée du faítage.In general, we know that in order to ensure the security of people working on a roof, safety standards recommend the use of lifelines including a steel cable stretched between two anchoring elements fixed to the frame. So this cable is frequently permanently installed parallel and at a predetermined distance from the ridge.

La tension de ce câble est assurée au moyen d'un tendeur de câble de type classique interposé entre l'une de ses extrémités et son élément d'ancrage.The tension of this cable is ensured by means of a cable tensioner of the type classic interposed between one of its ends and its anchoring element.

Grâce à ces dispositions, chaque personne présente sur la couverture et équipée d'un harnais (ou d'un baudrier) peut s'accrocher à ce câble grâce à un lien (par exemple une longe ou une sangle) relié d'un côté au harnais (ou au baudrier) et, de l'autre côté, à un mousqueton pouvant se monter sur le câble et coulisser le long de celui-ci.Thanks to these provisions, each person present on the cover and equipped with a harness (or a harness) can hang on this cable thanks to a link (for example a lanyard or strap) connected on one side to the harness (or harness) and, on the other side, a carabiner that can be mounted on the cable and slide along it.

La longueur de ce lien est déterminée par des normes en fonction des dimensions de la toiture. The length of this link is determined by standards based on roof dimensions.

Habituellement, pour permettre à la personne de travailler sans entrave, la liaison entre le lien et le harnais ou le baudrier s'effectue dans la région dorsale de celui-ci.Usually, to allow the person to work without hindrance, the connection between the link and the harness or the harness is made in the region backbone of it.

Il s'avère que, lors d'une chute, la personne qui tombe se trouve trop brutalement retenue par le lien : cette réaction brutale du lien au moment où il entre en tension peut provoquer des traumatismes importants. Ce type de traumatisme peut être particulièrement grave dans le cas d'un accrochage dorsal puisque, dans ce cas, la réaction du lien s'exerce directement sur la colonne vertébrale de la personne.It turns out that, during a fall, the person who falls falls too far brutally restrained by the link: this brutal reaction of the link when it entering tension can cause significant trauma. This kind of trauma can be particularly severe in the event of a snag dorsal since, in this case, the reaction of the link is exerted directly on the the person's spine.

L'usage de moyens élastiques pour amortir ce choc, par exemple d'un lien élastique, ne constitue pas une solution satisfaisante en raison de la force de rappel qu'exercent ces moyens élastiques après sollicitation.The use of elastic means to absorb this shock, for example a link elastic, is not a satisfactory solution due to the strength of reminder that these elastic means exercise after solicitation.

L'invention a donc plus particulièrement pour but de supprimer ces inconvénients.The invention therefore more particularly aims to remove these disadvantages.

A cet effet, elle propose de disposer en série avec le câble et/ou le susdit lien, par exemple entre l'une des extrémités du câble et son élément d'ancrage, un dispositif amortisseur comprenant des moyens élastiques soumis aux efforts de traction dudit câble et/ou dudit lien et des moyens de rétention permettant de rendre rémanente la déformation des moyens élastiques engendrée par lesdits efforts, au-delà d'un seuil d'effort prédéterminé, ainsi que des moyens permettant de ramener les moyens élastiques à leur position initiale après qu'ils aient subi une déformation rémanente.To this end, it proposes to arrange in series with the cable and / or the above link, for example between one end of the cable and its anchoring element, a damping device comprising elastic means subjected to the forces of pulling said cable and / or said link and retention means making it possible to make the deformation of the elastic means caused by said remanent efforts, beyond a predetermined effort threshold, as well as allowing the elastic means to be returned to their initial position after that they have undergone a residual deformation.

Avantageusement, les susdits moyens élastiques pourront consister en un ressort hélicoïdal pouvant se déformer linéairement en fonction de la traction exercée par le susdit câble ou le susdit lien, tandis que les susdits moyens de rétention pourront consister en un système de crémaillère solidaire de l'une des extrémités du ressort, ce système de crémaillère comprenant des crantages coopérant avec un encliquetage solidaire de l'autre extrémité du ressort.Advantageously, the above elastic means may consist of a helical spring capable of linear deformation depending on traction exercised by the above cable or the above link, while the above means of retention may consist of a rack system integral with one of the ends of the spring, this rack system comprising notches cooperating with a snap secured to the other end of the spring.

Dans ce cas, le retour du ressort à sa position d'origine pourra être obtenu en exerçant une action sur l'encliquetage pour libérer la crémaillère.In this case, the return of the spring to its original position can be obtained by exerting an action on the snap to release the rack.

Selon une variante d'exécution, le susdit système de crémaillère pourra comprendre une tige à filet hélicoïdal en dent de loup coopérant avec des cliquets de manière à ce que, lors d'une déformation du ressort engendrée par une traction du câble, il se produise un déplacement relatif entre la tige et les cliquets (qui coulissent sur les fronts faiblement inclinés du filet) et que, lorsque cette traction cesse, le ressort soit maintenu dans sa position grâce à l'engagement des cliquets sur le filet (les cliquets venant en butée sur le front abrupt du filet).According to an alternative embodiment, the above rack system may include a wolf tooth helical thread rod cooperating with pawls so that, during a deformation of the spring caused by a traction of the cable, there is a relative displacement between the rod and the pawls (which slide on the slightly inclined fronts of the net) and that, when this traction ceases, the spring is held in its position thanks to engaging the pawls on the net (the pawls abutting on the front steep of the net).

Cette solution présente l'avantage de permettre de ramener le ressort à sa position d'origine par une simple rotation relative entre la tige et les cliquets : cette opération peut s'effectuer sans provoquer de retour brutal du ressort et donc sans danger. En outre, elle permet d'assurer la tension initiale du câble, ce qui évite d'avoir à utiliser un tendeur de câble.This solution has the advantage of allowing the spring to be brought back to its original position by a simple relative rotation between the rod and the pawls: this operation can be carried out without causing a sudden return of the spring and therefore harmless. In addition, it ensures the initial tension of the cable, which avoids having to use a cable tensioner.

Des modes d'exécution de l'invention seront décrits ci-après, à titre d'exemples non limitatifs, avec référence aux dessins annexés dans lesquels :

  • La figure 1 est une représentation schématique d'une ligne de vie montée sur une couverture à proximité d'un faítage ;
  • Les figures 2 à 4 sont des vues en perspective des différents éléments de la ligne de vie représentée sur la figure 1, à savoir : un élément d'ancrage d'extrémité (figure 2), un élément de guidage intermédiaire (figure 3) et un tendeur de câble (figure 4).
  • La figure 5 est une coupe axiale d'un élément amortisseur utilisant un dispositif de rétention à tige crantée.
  • La figure 6 montre une variante d'exécution d'un élément amortisseur utilisant une tige à filet hélicoïdal.
    • Embodiments of the invention will be described below, by way of nonlimiting examples, with reference to the appended drawings in which:
  • Figure 1 is a schematic representation of a lifeline mounted on a cover near a ridge;
  • Figures 2 to 4 are perspective views of the various elements of the lifeline shown in Figure 1, namely: an end anchoring element (Figure 2), an intermediate guide element (Figure 3) and a cable tensioner (figure 4).
  • Figure 5 is an axial section of a damping element using a notched rod retention device.
  • Figure 6 shows an alternative embodiment of a damping element using a helical thread rod.

    • Dans l'exemple représenté sur la figure 1, la ligne de vie 1 se compose d'un câble 2 en acier tendu entre deux éléments d'ancrage 3, 4 au moyen d'un tendeur de câble classique 5 (situé entre l'une de ses extrémités 6 et l'élément 3).In the example shown in Figure 1, the lifeline 1 consists of a steel cable 2 stretched between two anchoring elements 3, 4 by means of a classic cable tensioner 5 (located between one of its ends 6 and the element 3).

    Cette ligne de vie 1 comprend en outre un amortisseur 7 monté entre l'autre extrémité 8 du câble 2 et l'autre élément d'ancrage 4, ainsi que des éléments de maintien et de guidage 9 du câble disposés à intervalles réguliers (par exemple tous les 5 m).This lifeline 1 further comprises a damper 7 mounted between the other end 8 of cable 2 and the other anchoring element 4, as well as elements holding and guiding 9 of the cable arranged at regular intervals (for example every 5 m).

    Dans cet exemple, les éléments d'ancrage 3, 4 sont fixés au sommet d'une toiture 10, de manière à ce que le câble 2 s'étende parallèlement et à proximité du faítage 11. Bien entendu, la position de ces éléments d'ancrage 3, 4 par rapport aux rives et aux pignons de la toiture doit être conforme aux règlements de sécurité en vigueur.In this example, the anchoring elements 3, 4 are fixed to the top of a roof 10, so that the cable 2 extends parallel and close ridge 11. Of course, the position of these anchoring elements 3, 4 by relationship to the edges and gables of the roof must comply with safety regulations in force.

    Le câble 2 est destiné à recevoir des mousquetons 12 raccordés à des liens d'assurance (longes, sangles ou cordes d'assurance), eux-mêmes fixés à des harnais 13 ou des baudriers portés par les personnes travaillant sur la toiture. Ces mousquetons 12 peuvent donc coulisser le long du câble 2 de manière à permettre à ces personnes de se déplacer parallèlement au faítage 12 tout en restant assurées. Cable 2 is intended to receive carabiners 12 connected to links insurance (lanyards, belts or ropes), themselves attached to harness 13 or harnesses worn by people working on the roof. These carabiners 12 can therefore slide along the cable 2 so as to allow these people to move parallel to the ridge 12 while remaining insured.

    Les éléments d'ancrage 3, 4 peuvent consister, comme illustré figure 2, en un tronçon de cornière dont une aile 14 de forme rectangulaire est munie d'une pluralité de perçages permettant la fixation par vissage de l'élément sur une couverture, et dont l'autre aile 15, de forme sensiblement triangulaire, est munie, au niveau de son sommet, d'un perçage 16 destiné à permettre la fixation de l'une des extrémités du câble 2 directement ou par l'intermédiaire d'un accessoire tel que, par exemple, le tendeur de câble 5 ou l'amortisseur 7. Cette aile triangulaire comprend, en outre, deux perçages 17, 18 permettant d'assurer la fixation d'une pièce d'ancrage additionnelle 19 munie d'un orifice 20 servant de point d'ancrage fixe.The anchoring elements 3, 4 can consist, as illustrated in FIG. 2, of a section of angle iron of which a wing 14 of rectangular shape is provided with a plurality of holes for fixing by screwing the element on a cover, and of which the other wing 15, of substantially triangular shape, is provided, at its top, with a hole 16 intended to allow the fixing of one end of the cable 2 directly or through an accessory such as, for example, the cable tensioner 5 or the shock absorber 7. This triangular wing further comprises two holes 17, 18 allowing securing an additional anchor piece 19 provided with an orifice 20 serving as a fixed anchor point.

    Les éléments de maintien et de guidage 9 consistent également en des tronçons de cornière présentant une aile de fixation rectangulaire 21 munie de perçages et une aile de forme trapézoïdale 22 dont la grande base est solidaire de l'aile 21, tandis que la petite base est prolongée par deux languettes incurvées de concavités opposées 23, 24. Ces deux languettes 23, 24 qui sont axialement décalées délimitent un passage par lequel peut passer le câble 2 ainsi que les mousquetons 12 coulissant sur le câble 2.The holding and guiding elements 9 also consist of sections angle iron having a rectangular fixing wing 21 provided with holes and a trapezoidal wing 22 whose large base is integral with the wing 21, while the small base is extended by two curved tabs of opposite concavities 23, 24. These two tongues 23, 24 which are axially offset define a passage through which the cable 2 can pass as well as the carabiners 12 sliding on cable 2.

    Le tendeur de câble 5 utilisé dans cet exemple comprend de façon classique deux écrous coaxiaux 25, 26 reliés l'un à l'autre par une pièce de liaison en forme de H Dans chacun de ces écrous 25, 26 viennent s'engager et se visser deux vis respectives 27, 28 dont les têtes sont constituées par des chapes d'articulation comportant chacune un axe transversal destiné à venir s'engager dans l'orifice d'un élément d'ancrage 3, 4 ou d'une boucle formée à l'extrémité du câble 2.The cable tensioner 5 used in this example conventionally comprises two coaxial nuts 25, 26 connected to each other by a connecting piece in H shape In each of these nuts 25, 26 are engaged and screwed two respective screws 27, 28, the heads of which consist of yokes of articulation each comprising a transverse axis intended to come to engage in the hole of an anchor element 3, 4 or of a loop formed at cable end 2.

    Tel que représenté sur la figure 5, l'amortisseur 7 se compose d'un corps tubulaire cylindrique 30 refermé d'un côté par un fond 31 muni d'un perçage central 32 dans lequel vient s'engager et se fixer une chape d'articulation 33. Dans cet exemple, cette chape 33 présente une structure en forme de U comprenant deux ailes parallèles reliées par l'une de ses extrémités par une âme axialement prolongée par une tige filetée qui s'engage dans l'orifice 32. La fixation est alors obtenue par vissage d'un écrou 34 avec interposition d'une rondelle.As shown in Figure 5, the damper 7 consists of a body cylindrical tubular 30 closed on one side by a bottom 31 provided with a bore central 32 in which engages and fixes a hinge yoke 33. In this example, this yoke 33 has a U-shaped structure comprising two parallel wings connected by one of its ends by a core axially extended by a threaded rod which engages in orifice 32. The fixing is then obtained by screwing a nut 34 with interposition a washer.

    La deuxième extrémité du corps tubulaire est équipée d'un palier 35 dans lequel s'engage et peut coulisser une tige 36 terminée d'un côté par une chape 37 et de l'autre côté par un filetage sur lequel est vissé un écrou 38.The second end of the tubular body is equipped with a bearing 35 in which engages and can slide a rod 36 terminated on one side by a yoke 37 and on the other side by a thread onto which a nut 38 is screwed.

    Dans sa partie centrage, la tige comprend une série de crantages annulaires en dent de loup 39, comprenant chacun, du côté du fond, un front raide 40 (perpendiculaire à l'axe de la tige 36) et, de l'autre côté, un front conique 41 à pente relativement douce.In its centering part, the rod comprises a series of annular notches in wolf tooth 39, each comprising, on the bottom side, a stiff front 40 (perpendicular to the axis of the rod 36) and, on the other side, a conical front 41 to relatively gentle slope.

    Ces crantages 39 sont destinés à coopérer avec un encliquetage comprenant au moins une mâchoire 42 comprenant deux mors 43, 44 situés de part et d'autre de la tige 36 en deux emplacements diamétralement opposés. Ces deux mors 43, 44 présentent chacun une forme trapézoïdale rectangle dont la grande base 45, oblique, est située côté tige et est orientée parallèlement à la face conique 39 des crantages de la tige tandis que le plus grand des deux côtés parallèles 45' (qui s'étend radialement) est destiné à servir de butée anti-retour pour le front raide 40 d'un crantage.These notches 39 are intended to cooperate with a snap comprising at at least one jaw 42 comprising two jaws 43, 44 located on either side of the rod 36 in two diametrically opposite locations. These two jaws 43, 44 each have a rectangular trapezoidal shape whose large base 45, oblique, is located on the rod side and is oriented parallel to the conical face 39 of the notches of the stem while the larger of the two parallel sides 45 '(which extends radially) is intended to serve as a non-return stop for the steep front 40 of a notch.

    Les deux mors 43, 44 sont montés basculants autour de deux axes sensiblement parallèles qui s'étendent dans un plan perpendiculaire à l'axe de la tige : ces deux axes consistent ici en deux portions opposées d'une frette annulaire 46 passant dans deux orifices correspondants situés dans la partie médiane des mors 43, 44. Les deux mors 43, 44 sont sollicités par un jonc élastique 47 de manière à ce que leur région angulaire délimitée par la grande base 45 et le grand côté 45' viennent en appui sur la tige 36. The two jaws 43, 44 are mounted tilting around two axes substantially parallel which extend in a plane perpendicular to the axis of the stem: these two axes here consist of two opposite portions of a hoop annular 46 passing through two corresponding orifices located in the part median of the jaws 43, 44. The two jaws 43, 44 are urged by a rod elastic 47 so that their angular region bounded by the large base 45 and the large side 45 'come to bear on the rod 36.

    Dans son ensemble, la mâchoire 42 est axialement retenue dans un espace délimité par le palier 35 et un élément annulaire 48 solidaire de la paroi intérieure du corps 30.As a whole, the jaw 42 is axially retained in a space delimited by the bearing 35 and an annular element 48 integral with the wall inside the body 30.

    Par ailleurs, la tige 36 est soumise à l'action d'un ressort hélicoïdal 49 disposé coaxialement à l'intérieur du corps 30 autour de la tige 36 et dont l'une des extrémités prend appui sur l'élément annulaire 48, tandis que l'autre extrémité est retenue par l'écrou 34 grâce à une rondelle 50 de diamètre extérieur sensiblement égal au diamètre intérieur du corps 30.Furthermore, the rod 36 is subjected to the action of a helical spring 49 disposed coaxially inside the body 30 around the rod 36 and one of which ends rests on the annular element 48, while the other end is retained by the nut 34 thanks to a washer 50 of outside diameter substantially equal to the internal diameter of the body 30.

    Avantageusement, l'extrémité de la tige 36 adjacente à la chape 37 pourra comprendre une graduation permettant le réglage de la tension du câble 2 à l'image d'un dynamomètre classique.Advantageously, the end of the rod 36 adjacent to the yoke 37 may include a scale allowing adjustment of the cable tension 2 to the image of a classic dynamometer.

    Grâce à ces dispositions, lors de la pose de la ligne de vie 1, l'opérateur agit sur le tendeur de câble 5 jusqu'à ce que la tension du câble atteigne la valeur souhaitée (indiquée sur la graduation). Au cours de cette phase de réglage, la tige 36 se déplace axialement en comprimant le ressort 49. Les mors 43, 44 demeurent en appui sur une partie lisse de la tige 36 adjacente à la chape 37. Cette tension du câble 2 doit être suffisante pour que les personnes qui y sont accrochées puissent effectuer de légères tractions sans que cela se traduise par une déformation importante du câble 2 et/ou par un encliquetage de la mâchoire sur un cran de la tige 36.Thanks to these provisions, during the installation of the lifeline 1, the operator acts on the cable tensioner 5 until the cable tension reaches the value desired (indicated on the scale). During this adjustment phase, the rod 36 moves axially by compressing the spring 49. The jaws 43, 44 remain supported on a smooth part of the rod 36 adjacent to the yoke 37. This tension of the cable 2 must be sufficient so that the persons who are there hooked up can do light pull-ups without this resulting in significant deformation of the cable 2 and / or by a snap-fastening of the jaw on a notch of the rod 36.

    Lorsque la traction dépasse une valeur prédéterminée, par exemple à la suite d'une chute d'une personne, la tige 36 soumise à un effort de traction important, se déplace axialement. Au cours de ce déplacement, les mors 43, 44 se trouvent successivement écartés pour laisser le passage des crantages 39 jusqu'à ce que l'équilibre des forces soit atteint. Dans ce cas, les mors 43, 44 se referment sur la tige 36, le grand côté 45' venant en butée sur le front raide 40 du dernier crantage passé au travers de la mâchoire 42. When the traction exceeds a predetermined value, for example following a fall from a person, the rod 36 subjected to a tensile force important, moves axially. During this movement, the jaws 43, 44 are successively pushed aside to allow the passage of the notches 39 until the balance of forces is reached. In this case, the jaws 43, 44 close on the rod 36, the long side 45 'abutting on the stiff front 40 of the last notch passed through the jaw 42.

    L'amortisseur 7 demeure ensuite verrouillé dans cette position. De ce fait, la personne victime de la chute ne subit pas l'effort brutal exercé par le ressort pour retourner à sa position initiale. De préférence, ce retour en position initiale sera assuré en usine à l'aide de moyens permettant d'éviter que la libération du ressort ne s'effectue brutalement en mettant en danger les opérateurs. Cette libération pourra être obtenue en exerçant sur les mors 43, 44 un effort tendant à les faire basculer, en leur faisant ainsi échapper aux crantages 39. A cet effet, des orifices 52, 53 pourront être prévus dans le corps cylindrique 30 pour permettre d'exercer cet effort au moyen d'un outil spécial.The damper 7 then remains locked in this position. Therefore, the person victim of the fall does not undergo the brutal force exerted by the spring to return to its original position. Preferably, this return to position will be provided in the factory using means to prevent the release of the spring is not carried out suddenly by endangering the operators. This release can be obtained by exerting on the jaws 43, 44 an effort to overturn them, thus making them escape from notches 39. For this purpose, orifices 52, 53 may be provided in the body cylindrical 30 to allow this effort to be exerted by means of a special tool.

    Bien entendu, l'invention ne se limite pas au mode d'exécution de l'amortisseur précédemment décrit.Of course, the invention is not limited to the mode of execution of the damper previously described.

    Ainsi, la tige crantée pourra être remplacée par une tige 54 à filet hélicoïdal 55 à dent de loup (présentant un flanc abrupt et un flanc faiblement incliné). Dans ce cas, les mors 43', 44' seront spécialement conformés pour coopérer avec ce filet 55. Le fonctionnement de cet amortisseur est très similaire au précédent. Toutefois, dans ce cas, le retour de la tige 54 à sa position d'origine après avoir effectué sa fonction d'amortissement pourra être simplement assuré en faisant pivoter la tige 54 par rapport au corps 30, de manière à engendrer un processus de dévissage. On obtient ainsi un retour en position d'origine sans risque pour l'opérateur.Thus, the notched rod can be replaced by a rod 54 with a helical thread 55 wolf tooth (with a steep side and a slightly inclined side). In in this case, the jaws 43 ', 44' will be specially shaped to cooperate with this filet 55. The functioning of this shock absorber is very similar to the previous one. However, in this case, the return of the rod 54 to its original position after having performed its depreciation function can be simply insured by pivoting the rod 54 relative to the body 30, so as to generate a unscrewing process. We thus obtain a return to the original position without risk for the operator.

    Cette solution permet également d'éviter l'emploi d'un tendeur de câble. En effet, cette fonction peut être simplement obtenue en faisant pivoter le corps de l'amortisseur, de manière à engendrer un processus de vissage de la tige 54 sur les mors 43', 44'. Dans ce cas, la chape 33' devra être montée rotative dans le fond 31 du corps 30. This solution also avoids the use of a cable tensioner. In indeed, this function can be simply achieved by rotating the body of the shock absorber, so as to generate a process of screwing the rod 54 on the jaws 43 ', 44'. In this case, the yoke 33 'must be rotatably mounted in the bottom 31 of the body 30.

    Eventuellement, cette chape pourra être solidaire d'une tige filetée 56 venant se visser dans le fond 31. En prévoyant pour cette tige 56 un pas inverse de celui de la tige 54, on obtient ainsi des moyens de réglage de la tension du câble dont les effets viennent se rajouter à ceux obtenus avec le couple mâchoire 43', 44'/tige 54.Optionally, this yoke may be integral with a threaded rod 56 coming from screw into the bottom 31. By providing for this rod 56 a reverse pitch of that of the rod 54, one thus obtains means for adjusting the tension of the cable whose effects are added to those obtained with the couple jaw 43 ', 44' / rod 54.

    Claims (8)

    Ligne de vie à amortisseur de chute comprenant un câble (2) tendu entre deux éléments d'ancrage (3, 4) fixés sur la toiture ainsi qu'un lien dont une extrémité est montée coulissante sur le câble (2), tandis que l'autre est reliée à des moyens de fixation tel qu'un harnais ou un baudrier (13),
    caractérisée en ce qu'elle comporte en série avec ledit câble ou ledit lien un dispositif amortisseur (7) comprenant des moyens élastiques (49) soumis aux efforts de traction dudit câble (2) et/ou dudit lien et des moyens de rétention (39 - 43, 44) permettant de rendre rémanente la déformation des moyens élastiques (49) engendrée par lesdits efforts, au-delà d'un seuil d'effort prédéterminé, ainsi que des moyens permettant de ramener les moyens élastiques (49) à leur position initiale après qu'ils aient subi une déformation rémanente.    Fall arrestor lifeline comprising a cable (2) stretched between two anchoring elements (3, 4) fixed to the roof as well as a link, one end of which is slidably mounted on the cable (2), while the the other is connected to fixing means such as a harness or a harness (13),
    characterized in that it comprises, in series with said cable or said link, a damping device (7) comprising elastic means (49) subjected to the tensile forces of said cable (2) and / or of said link and retention means (39 - 43, 44) making it possible to make the deformation of the elastic means (49) caused by said efforts remanent, beyond a predetermined force threshold, as well as means making it possible to return the elastic means (49) to their position initial after they have undergone a residual deformation.         Ligne de vie selon la revendication 1,
    caractérisée en ce que le susdit amortisseur (7) est disposé entre l'une des extrémités du câble (2) et son élément d'ancrage (4).    Lifeline according to claim 1,
    characterized in that the above shock absorber (7) is disposed between one end of the cable (2) and its anchoring element (4).         Ligne de vie selon l'une des revendications 1 et 2,
    caractérisée en ce que les susdits moyens élastiques consistent en un ressort hélicoïdal (49) pouvant se déformer linéairement en fonction de la traction exercée par le susdit câble (2) ou le susdit lien, tandis que les susdits moyens de rétention consistent en un système de crémaillère (36, 39) solidaire de l'une des extrémités du ressort (49), ce système de crémaillère comprenant des crantages (39) coopérant avec un encliquetage (42, 43, 44) , solidaire de l'autre extrémité du ressort (49).     Lifeline according to one of claims 1 and 2,
    characterized in that the above elastic means consist of a helical spring (49) which can deform linearly as a function of the traction exerted by the above cable (2) or the above link, while the above retention means consist of a system of rack (36, 39) secured to one end of the spring (49), this rack system comprising notches (39) cooperating with a snap (42, 43, 44), secured to the other end of the spring ( 49).         Ligne de vie selon la revendication 3,
    caractérisée en ce qu'elle comprend des moyens (52, 53) permettant d'exercer une action sur l'encliquetage (42) pour libérer la crémaillère (36, 39) et permettre son retour à sa position d'origine.    Lifeline according to claim 3,
    characterized in that it comprises means (52, 53) making it possible to exert an action on the snap (42) to release the rack (36, 39) and allow it to return to its original position.         Ligne de vie selon l'une des revendications 3 et 4,
    caractérisée en ce que le susdit système de crémaillère (36, 39) comprend une tige (36) munie d'une série de crantages annulaires en dent de loup (39), ainsi qu'un dispositif d'encliquetage comprenant deux mors (43, 44) situés de part et d'autre de la tige (36), ces deux mors (43, 44) étant montés basculants et sollicités par des moyens élastiques (47) en direction de la tige (36).    Lifeline according to one of claims 3 and 4,
    characterized in that the aforesaid rack system (36, 39) comprises a rod (36) provided with a series of annular notches in wolf tooth (39), as well as a latching device comprising two jaws (43, 44) located on either side of the rod (36), these two jaws (43, 44) being pivotally mounted and urged by elastic means (47) in the direction of the rod (36).         Ligne de vie selon l'une des revendications 3 et 4,
    caractérisée en ce que le susdit système de crémaillère comprend une tige (54) à filet hélicoïdal en dent de loup (55) coopérant avec des cliquets (43', 44') de manière à ce que, lors d'une déformation du ressort (49) engendrée par une traction du câble (2), il se produise un déplacement relatif entre la tige (54) et les cliquets (43', 44') qui coulissent sur les fronts faiblement inclinés du filet (55) et que, lorsque cette traction cesse, le ressort (49) soit maintenu dans sa position grâce à l'engagement des cliquets (43', 44') sur le filet (55), les cliquets (43', 44') venant en butée sur le front abrupt du filet (55).    Lifeline according to one of claims 3 and 4,
    characterized in that the above rack system comprises a rod (54) with a wolf tooth helical thread (55) cooperating with pawls (43 ', 44') so that, when the spring is deformed ( 49) generated by a pull of the cable (2), there is a relative displacement between the rod (54) and the pawls (43 ', 44') which slide on the slightly inclined fronts of the net (55) and that, when this traction ceases, the spring (49) is held in its position thanks to the engagement of the pawls (43 ', 44') on the thread (55), the pawls (43 ', 44') abutting on the front steep of the net (55).         Ligne de vie selon l'une des revendications 3 à 6,
    caractérisée en ce que le système de crémaillère comprend une graduation permettant un réglage de la tension du câble (2).    Lifeline according to one of claims 3 to 6,
    characterized in that the rack system includes a scale allowing adjustment of the cable tension (2).         Ligne de vie selon l'une des revendications précédentes,
    caractérisée en ce que la fixation du susdit amortisseur (7) à son élément d'ancrage (4) s'effectue au moyen d'une chape (33'), munie d'une tige (56) venant se visser dans un perçage taraudé réalisé dans le fond (31) du corps (30) dudit amortisseur (7).    Lifeline according to one of the preceding claims,
    characterized in that the fixing of the above-mentioned shock absorber (7) to its anchoring element (4) is effected by means of a yoke (33 '), provided with a rod (56) which is screwed into a threaded bore made in the bottom (31) of the body (30) of said damper (7).
    EP20040290919 2003-04-07 2004-04-07 Lifeline with fall absorber Expired - Lifetime EP1466650B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0304306 2003-04-07
    FR0304306A FR2853250B1 (en) 2003-04-07 2003-04-07 LIFE LINE WITH SHOCK ABSORBER

    Publications (2)

    Publication Number Publication Date
    EP1466650A1 true EP1466650A1 (en) 2004-10-13
    EP1466650B1 EP1466650B1 (en) 2007-01-10

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    ID=32865388

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP20040290919 Expired - Lifetime EP1466650B1 (en) 2003-04-07 2004-04-07 Lifeline with fall absorber

    Country Status (3)

    Country Link
    EP (1) EP1466650B1 (en)
    DE (1) DE602004004188T2 (en)
    FR (1) FR2853250B1 (en)

    Cited By (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006056793A1 (en) * 2004-11-29 2006-06-01 Rapid Rail International Limited Fall arrest support
    GB2420544B (en) * 2005-11-28 2007-02-28 Rapid Rail Internat Ltd Fall arrest support
    GB2443620A (en) * 2005-11-05 2008-05-14 Stephen Murten Shock absorbing and tensioning device for a safety cable for operatives working at height
    EP2095847A1 (en) * 2008-02-26 2009-09-02 SKYLOTEC GmbH Fall damper
    CN103111029A (en) * 2012-12-25 2013-05-22 上海普英特高层设备有限公司 Anti-fall safety wire
    GB2513190A (en) * 2013-04-19 2014-10-22 Latchways Plc Fall arrest systems and anchor
    EP2823861A1 (en) * 2013-07-09 2015-01-14 Total Marketing Services Device for the detection of a fall for a life line; installation of a life line with such a detector; and an associated method of detection

    Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR1315110A (en) * 1961-12-04 1963-01-18 Fall absorber
    US5458214A (en) * 1992-10-14 1995-10-17 Rose Systems, Inc. Safety apparatus
    WO1999051304A2 (en) * 1998-04-02 1999-10-14 Choate, Gary, A. Energy absorption device for fall arrest systems
    WO2002019547A2 (en) * 2000-08-31 2002-03-07 Choate Gary E Method to reduce horizontal lifeline tension and extension during fall arrest

    Patent Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR1315110A (en) * 1961-12-04 1963-01-18 Fall absorber
    US5458214A (en) * 1992-10-14 1995-10-17 Rose Systems, Inc. Safety apparatus
    WO1999051304A2 (en) * 1998-04-02 1999-10-14 Choate, Gary, A. Energy absorption device for fall arrest systems
    WO2002019547A2 (en) * 2000-08-31 2002-03-07 Choate Gary E Method to reduce horizontal lifeline tension and extension during fall arrest

    Cited By (11)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006056793A1 (en) * 2004-11-29 2006-06-01 Rapid Rail International Limited Fall arrest support
    GB2443620A (en) * 2005-11-05 2008-05-14 Stephen Murten Shock absorbing and tensioning device for a safety cable for operatives working at height
    GB2420544B (en) * 2005-11-28 2007-02-28 Rapid Rail Internat Ltd Fall arrest support
    EP2095847A1 (en) * 2008-02-26 2009-09-02 SKYLOTEC GmbH Fall damper
    CN103111029A (en) * 2012-12-25 2013-05-22 上海普英特高层设备有限公司 Anti-fall safety wire
    GB2513190A (en) * 2013-04-19 2014-10-22 Latchways Plc Fall arrest systems and anchor
    GB2513190B (en) * 2013-04-19 2017-03-01 Latchways Plc Fall arrest systems and anchor
    EP2792390A3 (en) * 2013-04-19 2017-08-02 Latchways PLC Fall arrest systems and anchor
    EP2823861A1 (en) * 2013-07-09 2015-01-14 Total Marketing Services Device for the detection of a fall for a life line; installation of a life line with such a detector; and an associated method of detection
    FR3008528A1 (en) * 2013-07-09 2015-01-16 Total Raffinage Marketing FALL DETECTION DEVICE FOR A LIFE LINE; LIFE LINE INSTALLATION EQUIPPED WITH SUCH A DEVICE; METHOD OF DETECTION OF ASSOCIATED FALL
    US9421402B2 (en) 2013-07-09 2016-08-23 Total Marketing Services Fall detection device for lifeline; lifeline installation equipped with said device; associated fall detection method

    Also Published As

    Publication number Publication date
    FR2853250A1 (en) 2004-10-08
    DE602004004188T2 (en) 2007-11-15
    EP1466650B1 (en) 2007-01-10
    DE602004004188D1 (en) 2007-02-22
    FR2853250B1 (en) 2005-05-20

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