EP2532616B1 - Security system for a vertically movable platform for a workman - Google Patents

Security system for a vertically movable platform for a workman Download PDF

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Publication number
EP2532616B1
EP2532616B1 EP12169419.4A EP12169419A EP2532616B1 EP 2532616 B1 EP2532616 B1 EP 2532616B1 EP 12169419 A EP12169419 A EP 12169419A EP 2532616 B1 EP2532616 B1 EP 2532616B1
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EP
European Patent Office
Prior art keywords
safety system
shaft
cam
rotatable
arm
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.)
Not-in-force
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EP12169419.4A
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German (de)
French (fr)
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EP2532616A1 (en
Inventor
Stéphane Gerbier
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.)
Lincoln Electric Co France SA
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Air Liquide Welding France
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Publication date
Application filed by Air Liquide Welding France filed Critical Air Liquide Welding France
Publication of EP2532616A1 publication Critical patent/EP2532616A1/en
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Publication of EP2532616B1 publication Critical patent/EP2532616B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms

Definitions

  • the invention relates to a mechanical safety device or system adapted to and adapted to react by activating a braking device in response to the occurrence of excessive speed or overspeed of a vertically movable platform for an on-board operator, in particular the mobile arm of an industrial bracket, such as a welding bracket with on-board operator, in particular an overspeed occurring in the event of sudden and sudden drop to the ground of said platform, and an installation, such as a welding bracket, equipped of such a security system.
  • Some metal structures of large dimensions that is to say of several meters, even tens of meters, can not be manufactured in one part and must therefore be formed by assembling smaller sub-parts which are welded between they.
  • wind turbine masts are generally formed by assembling several ferrules welded end-to-end, typically ferrules 3 to 10 meters in diameter.
  • ferrules typically ferrules 3 to 10 meters in diameter.
  • certain large equipment such as tanks or the like, used in the nuclear or naval field.
  • the welding of these sub-parts is generally done by implementing a method of submerged arc welding in multi-passes, namely up to 15 to 20 passes, depending on the thickness to be welded, and in configuration narrow joint.
  • the submerged arc welding for example of two ferrules with each other, is usually carried out on the top of the ferrules subjected to a rotational movement so as to be able to perform the deposition of metal from the fuse or son, along the weld joint.
  • Such a welding bracket comprises a vertical mast which supports a carrier arm movable vertically on the mast through an intermediate mobile device sliding along the mast, also called moving slide, on which is fixed the carrier arm.
  • a motorized system ensures the vertical rise of the arm along the mast.
  • the arm-carrier carries at its end an operator and equipment to operate and control the actual welding, including the welding torch or torches ...
  • This type of bracket is equipped with a braking device, commonly called “parachute” mechanical serving, in case of failure or breakage of a lifting element, such as a chain, an axis linking the chain to a support point or a gearbox shaft, to prevent the carrier arm from descending along the mast with too high a speed or “falling" speed and experiencing too much acceleration, which could cause damage to the installation and injuries to the operator, when the arm-carrier arrives at the bottom of the mast.
  • a braking device commonly called “parachute” mechanical serving
  • GB 2,046,206 A discloses a safety system comprising a rotary shaft, a ratchet wheel, a rotary cam and a pivoting lever carrying a pivoting arm with a pawl and a rotary roller which is adapted to cooperate with the rotary cam.
  • This braking device will, when triggered by an onboard security system, cooperate with the vertical mast of the bracket to block the downward movement of the arm-carrier.
  • the triggering of the braking device is currently done through a safety system comprising a point of attachment for a lifting chain cooperating with the braking device to lock an eccentric on a stop rail arranged on the mast and thus stop the fall of the arm-carrier.
  • the safety system and the braking device are also carried by the intermediate mobile device which slides along the mast.
  • the problem that arises then is to propose a safety system or device for a mobile platform installation with an on-board operator, in particular for a mobile arm-type jib along a vertical mast, such as a jib crane.
  • welding for reacting quickly in response to the occurrence of an underspeed of the platform or the arm-carrier, particularly in case of fall of said arm-carrier following the breakage or failure of an element of the system of lifting, that the overspeed corresponds to a frank or non-frank break, by cooperating with a mechanical parachute equipping the gallows so as to stop the movement of fall and also to avoid that the operator is injured or other elements of the installation deteriorated by the fall of the support arm or the mobile platform vertically.
  • the invention further relates to an installation with a vertically movable operator platform, characterized in that it is equipped with a safety system according to the invention.
  • facilities comprising a platform, including a nacelle or the like, supporting one or more operators and which are designed for and able to be lowered or raised vertically, for example an elevator or a mobile platform along a mast, or any person raising system using a fixed linear guide system to which a rack can be attached, and concerned by standards NF EN 1495, NF EN 280 and NF EN 14502-2; such installations may be used for example for cleaning or maintenance of external surfaces can be used, for example, for cleaning or maintenance of external surfaces of buildings, in particular for cleaning glazed surfaces or painting external or internal coatings, or even ceilings.
  • the invention relates to a mobile arm-bearing bracket along a vertical mast, in particular an on-board welding bracket, characterized in that it is equipped with a safety system according to the invention. invention.
  • the bracket also comprises an intermediate mobile device sliding along the mast carrying the arm, the safety system and a braking device, the pinion of the rotary shaft of said security system cooperating with a rack carried by the mast. vertical, and the free end of the pivoting lever being adapted to and adapted to actuate the braking device, when the rotational speed Va transmitted by the pinion to the shaft, when said pinion moves along the rack, is or becomes greater than or equal to the determined threshold speed Vs of rotation of the shaft.
  • the invention also relates to a welding method, in particular to the submerged arc, in which a bracket according to the invention is used.
  • the Figure 1 schematizes an embodiment of an industrial bracket for submerged arc welding of parts or subunits of large metal structures, for example ferrules 3 to 10 meters in diameter (measured at the joint plane). ), welded one after the other, that is to say, rabbits, to form a wind turbine mast, which is equipped with a security system according to the invention (designated by the general reference 100).
  • This welding bracket 20 comprises a vertical mast 21 which supports a carrier arm 22 that can move vertically, that is to say from below upwards, on the mast 21 by means of an intermediate mobile device 25 sliding along the mast, still called a mobile ram, on which the support arm 22 is fixed.
  • the carrying arm 22 carries at its free end 22a, the various equipment necessary for producing and controlling the welding, namely in particular a welding torch, a flux feed system and welding wire. , a seal monitoring system, a vision system .... and an onboard operator 30 which is used to position and control the welding equipment and to ensure the smooth running of the welding operation, in particular during the execution of the different successive passes.
  • the movement of the carrier arm 22 along the mast 21 is done in a manner known per se by means of a motorized system comprising a set of chains and pinions driven by a geared motor.
  • the mast 21 comprises a rack 24 intended to cooperate with the safety system 100 of the invention, as explained hereinafter, as well as a stop rail 23 cooperating with a braking device 50 or mechanical parachute capable of be actuated, that is to say triggered, by the safety system 100 of the invention in case of inadvertent fall of the carrier arm 22.
  • the security system 100 of the invention comprises a rotary shaft 4 of axis AA, of generally cylindrical shape, carrying a pinion 5, a ratchet wheel 1 and a rotary cam 2, these elements being integrally fixed to the shaft 4.
  • the pinion 5 when it moves in the rack 24 of the mast 21, rotates the shaft 4 on which it is arranged, which shaft 4 then drives the ratchet wheel 1 and the rotary cam 2 which are arranged integrally on the -this.
  • the shaft 4, the pinion 5, the ratchet wheel 1 and the rotary cam 2 form in fact an assembly integral in rotation.
  • the security system 100 further comprises a pivoting lever 3 and a fixed cam member 9.
  • the pivoting lever 3 is of elongate shape and has a free first end 3a capable of actuating the safety device 50, and a second end 3b carrying a pivoting arm 6, which itself carries a pawl 7 to the one of its ends and a rotating roller 8 at its other end.
  • the pivoting lever 3 pivots or tilts preferentially about the axis AA of the shaft 4. To do this, it may consist of an oblong-shaped part pierced at its center with a passage through which the shaft passes. 4.
  • pivoting arm 6 pivots or tilts about an axis BB distinct from the axis AA but preferably parallel or almost parallel to said axis AA.
  • the ratchet wheel 1 is formed of a body or wheel provided all around its periphery with one or more notches 11 intended to cooperate with the pawl 7 of the pivoting arm 6 as explained hereinafter and illustrated in FIGS. Figures 5A to 5D .
  • the rotary cam 2 comprises, in turn, a central body 16 provided with one or more radial projections 12 or teeth disposed around the periphery of said body 16 and projecting outwards.
  • the rotary roller 8 is adapted to and designed to cooperate with the rotary cam 2 to detect a sudden speed variation beyond a given threshold value Vs, corresponding to an unexpected fall of the carrying arm 2, then with the rail 19 of the follower member 9 after pivoting the pivoting lever 3 and actuating the safety device 50 for stopping the fall.
  • the threshold speed Vs can be between 2 and 5 m / min.
  • the speed can be adapted case by case by simply changing the diameter of the drive pinion 5.
  • the rotary roller 8 which is violently pushed by the cam 2 away from it, will cause a tilting of the pivoting arm 6 on which it is arranged, and at the same time a movement of approaching the pawl 7 carried by the other end of the pivoting arm 6 in the direction of the ratchet wheel 1, and the engagement of said pawl 7 in one of the notches 11 of the ratchet wheel 1.
  • the tilting of the lever 3 about the axis AA is stopped when the rotary roller 8 cooperates with the guide rail 19 of the cam member against fixed 9, to stop said tilting of the lever 3, which will further disengage the pawl 7 of the notch 11 of the ratchet wheel 1 and the lever 3 is then no longer required.
  • the profile of the guide rail 19 of the counter-cam member 9 serves as a counter-cam itself.
  • the follower member 9 also carries a terminal stop 19 'for stopping an excessive stroke of the roller 8 along the guide rail 19.
  • the guide rail 19 cam follower alone allows to stop the movement of the roller 8.
  • the guide rail 19 and the follower member 9 are formed of a single piece, preferably the end stop 19 'is also formed within this single piece.
  • the security system 100 of the invention After triggering, the security system 100 of the invention must be rearmed manually.
  • the security system 100 of the invention can equip different types of installation with vertically mobile embedded platform.
  • a bracket 20 equipped with a security system according to the invention can be used to weld 60 three-dimensional structures of large dimensions, that is to say several meters in diameter, the weld is circular 61, for example to assemble two circular or frustoconical ferrules 63, 64 to one another, or linear 62, for example to make the closing weld of a ferrule.
  • the bracket 20 may be placed or fixed on the ground or, where appropriate, movable on rails, wheels or the like.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)
  • Jib Cranes (AREA)

Description

L'invention concerne un système ou dispositif mécanique de sécurité apte à et conçu pour réagir en activant un dispositif de freinage en réponse à l'occurrence d'une vitesse excessive ou survitesse de descente d'une plateforme mobile verticalement pour opérateur embarqué, en particulier du bras mobile d'une potence industrielle, telle une potence de soudage avec opérateur embarqué, en particulier une survitesse survenant en cas de chute brusque et subite vers le sol de ladite plateforme, ainsi qu'une installation, telle une potence de soudage, équipée d'un tel système de sécurité.The invention relates to a mechanical safety device or system adapted to and adapted to react by activating a braking device in response to the occurrence of excessive speed or overspeed of a vertically movable platform for an on-board operator, in particular the mobile arm of an industrial bracket, such as a welding bracket with on-board operator, in particular an overspeed occurring in the event of sudden and sudden drop to the ground of said platform, and an installation, such as a welding bracket, equipped of such a security system.

Certaines structures métalliques de grandes dimensions, c'est-à-dire de plusieurs mètres, voire dizaines de mètres, ne peuvent être fabriquées en une seule partie et doivent donc être formées par assemblage de sous-parties de plus petites dimensions qui sont soudées entre elles.Some metal structures of large dimensions, that is to say of several meters, even tens of meters, can not be manufactured in one part and must therefore be formed by assembling smaller sub-parts which are welded between they.

Ainsi, les mâts d'éoliennes sont généralement formés par assemblage de plusieurs viroles soudées bout-à-bout, typiquement des viroles de 3 à 10 mètres de diamètres. Il en va de même de certains équipements de grandes dimensions, tels des réservoirs ou analogues, utilisées dans le domaine nucléaire ou naval.Thus, wind turbine masts are generally formed by assembling several ferrules welded end-to-end, typically ferrules 3 to 10 meters in diameter. The same is true of certain large equipment, such as tanks or the like, used in the nuclear or naval field.

Le soudage de ces sous-parties se fait généralement par mise en oeuvre d'un procédé de soudage à l'arc submergé en multi-passes, à savoir jusqu'à 15 à 20 passes, selon l'épaisseur à souder, et en configuration de joint étroit.The welding of these sub-parts is generally done by implementing a method of submerged arc welding in multi-passes, namely up to 15 to 20 passes, depending on the thickness to be welded, and in configuration narrow joint.

Afin d'éviter que le flux de soudage ne tombe par gravité, le soudage à l'arc submergé par exemple de deux viroles l'une avec l'autre se fait habituellement sur le dessus des viroles soumises à un mouvement rotatif de manière à pouvoir réaliser le dépôt de métal provenant du ou des fils fusibles, le long du joint de soudure.In order to prevent the welding flux from falling by gravity, the submerged arc welding, for example of two ferrules with each other, is usually carried out on the top of the ferrules subjected to a rotational movement so as to be able to perform the deposition of metal from the fuse or son, along the weld joint.

Pour ce faire, on utilise classiquement une potence de soudage à opérateur embarqué. Une telle potence de soudage comprend un mât vertical qui supporte un bras-porteur mobile verticalement sur le mât par le biais d'un dispositif mobile intermédiaire coulissant le long du mât, encore appelé coulisseau mobile, sur lequel est fixé le bras-porteur. Un système motorisé permet d'assurer la montée verticale du bras le long du mât. Le bras-porteur porte à son extrémité un opérateur et des équipements pour opérer et contrôler le soudage proprement dit, notamment la ou les torches de soudage...To do this, it is conventionally used an on-board welding bracket. Such a welding bracket comprises a vertical mast which supports a carrier arm movable vertically on the mast through an intermediate mobile device sliding along the mast, also called moving slide, on which is fixed the carrier arm. A motorized system ensures the vertical rise of the arm along the mast. The arm-carrier carries at its end an operator and equipment to operate and control the actual welding, including the welding torch or torches ...

Ce type de potence est équipé d'un dispositif de freinage, couramment appelé « parachute » mécanique, servant, en cas de défaillance ou rupture d'un élément du système de levage, tel qu'une chaîne, un axe liant la chaine à un point de support ou un arbre de réducteur, d'éviter que le bras-porteur ne descende le long du mât avec une vitesse trop élevée ou vitesse « de chute » et ne subisse une accélération trop importante, lesquelles risqueraient d'engendrer des dégâts à l'installation et des blessures à l'opérateur, lors de l'arrivée brutale du bras-porteur en bas de mât.This type of bracket is equipped with a braking device, commonly called "parachute" mechanical serving, in case of failure or breakage of a lifting element, such as a chain, an axis linking the chain to a support point or a gearbox shaft, to prevent the carrier arm from descending along the mast with too high a speed or "falling" speed and experiencing too much acceleration, which could cause damage to the installation and injuries to the operator, when the arm-carrier arrives at the bottom of the mast.

GB 2 046 206 A divulgue un système de sécurité comprenant un arbre rotatif, une roue à rochet, une came rotative et un levier pivotant portant un bras pivotant avec un cliquet et un galet rotatif qui est apte à coopérer avec la came rotative. GB 2,046,206 A discloses a safety system comprising a rotary shaft, a ratchet wheel, a rotary cam and a pivoting lever carrying a pivoting arm with a pawl and a rotary roller which is adapted to cooperate with the rotary cam.

Ce dispositif de freinage va, lorsqu'il est déclenché par un système de sécurité embarqué, venir coopérer avec le mât vertical de la potence pour bloquer le mouvement de descente du bras-porteur.This braking device will, when triggered by an onboard security system, cooperate with the vertical mast of the bracket to block the downward movement of the arm-carrier.

Le déclenchement du dispositif de freinage se fait actuellement grâce à un système de sécurité comprenant un point d'attache pour une chaîne de levage coopérant avec le dispositif de freinage pour bloquer un excentrique sur un rail d'arrêt agencé sur le mât et ainsi stopper la chute du bras-porteur. Le système de sécurité et le dispositif de freinage sont également porté par le dispositif mobile intermédiaire qui coulisse le long du mât.The triggering of the braking device is currently done through a safety system comprising a point of attachment for a lifting chain cooperating with the braking device to lock an eccentric on a stop rail arranged on the mast and thus stop the fall of the arm-carrier. The safety system and the braking device are also carried by the intermediate mobile device which slides along the mast.

Cependant, ce type de système de sécurité n'est pas idéal car, en cas de rupture non franche n'engendrant pas de chute libre du bras-porteur :

  • soit la détection de la défaillance est trop tardive et le blocage est opéré à une vitesse de descente indéterminée pouvant entraîner la rupture du système de freinage, donc la chute du bras engendrant alors un choc pouvant être important en butée basse,
  • soit la défaillance n'est pas détectée et la chute du bras se fait à une vitesse de descente indéterminée, conduisant alors, là encore, un choc pouvant être important en butée basse.
However, this type of security system is not ideal because, in the event of an open fracture that does not generate a free fall of the arm-carrier:
  • either the detection of the failure is too late and the blocking is operated at an indeterminate rate of descent may cause the breaking of the braking system, so the fall of the arm then generating a shock that can be significant at low stop,
  • either the failure is not detected and the fall of the arm is at an indeterminate rate of descent, then leading, here again, a shock that can be important at low stop.

Par ailleurs, des problèmes similaires se posent avec d'autres types d'installations avec plateforme à opérateur embarqué, mobile verticalement.In addition, similar problems arise with other types of installations with vertically mobile embedded operator platform.

Au vu de cela, le problème qui se pose alors est de proposer un système ou dispositif de sécurité pour installation à plateforme mobile à opérateur embarquée, en particulier pour potence à bras-porteur mobile le long d'un mât vertical, telle une potence de soudage, permettant de réagir rapidement en réponse à l'occurrence d'une survitesse de descente de la plateforme ou du bras-porteur, en particulier en cas de chute dudit bras-porteur consécutivement à la rupture ou défaillance d'un élément du système de levage, que la survitesse corresponde à une rupture franche ou non-franche, en coopérant avec un parachute mécanique équipant la potence de manière à stopper le mouvement de chute et à éviter par ailleurs que l'opérateur ne soit blessé ou d'autres éléments de l'installation détériorés par la chute du bras-porteur ou de la platefonne mobile verticalement.In view of this, the problem that arises then is to propose a safety system or device for a mobile platform installation with an on-board operator, in particular for a mobile arm-type jib along a vertical mast, such as a jib crane. welding, for reacting quickly in response to the occurrence of an underspeed of the platform or the arm-carrier, particularly in case of fall of said arm-carrier following the breakage or failure of an element of the system of lifting, that the overspeed corresponds to a frank or non-frank break, by cooperating with a mechanical parachute equipping the gallows so as to stop the movement of fall and also to avoid that the operator is injured or other elements of the installation deteriorated by the fall of the support arm or the mobile platform vertically.

La solution de l'invention est alors un système de sécurité, en particulier pour potence à bras-porteur mobile le long d'un mât vertical, comprenant :

  • un arbre rotatif d'axe AA portant un pignon, une roue à rochet et une came rotative,
  • un levier pivotant comprenant une première extrémité libre et une deuxième extrémité portant un bras pivotant, ledit bras pivotant comportant un cliquet et un galet rotatif, et
  • un élément de contre-came comprenant un rail de guidage,
dans lequel le levier pivotant pivote autour de l'axe AA de l'arbre, le cliquet du bras pivotant est apte à et conçu pour coopérer avec une ou plusieurs encoches portées par la roue à rochet et le galet rotatif est apte à et conçu pour coopérer avec la came rotative ou avec le rail de guidage de l'élément de contre-came.The solution of the invention is then a safety system, in particular for a mobile arm-bearing bracket along a vertical mast, comprising:
  • a rotary shaft of AA axis carrying a pinion, a ratchet wheel and a rotary cam,
  • a pivoting lever comprising a first free end and a second end carrying a pivoting arm, said pivoting arm comprising a pawl and a rotary roller, and
  • a cam follower member comprising a guide rail,
wherein the pivoting lever pivots about the axis AA of the shaft, the pawl of the pivoting arm is adapted to and adapted to cooperate with one or more notches carried by the ratchet wheel and the rotary roller is adapted to and adapted for cooperate with the rotating cam or with the guide rail of the cam member.

Selon le cas, le système ou dispositif de l'invention peut comprendre l'une ou plusieurs des caractéristiques suivantes :

  • la came rotative comprend un corps central muni d'une ou plusieurs projections radiales disposées sur le pourtour dudit corps et faisant saillie vers l'extérieur, c'est-à-dire faisant saillie radialement en éloignement par rapport à l'axe de rotation de la came rotative.
  • lorsque la vitesse de rotation Va de l'arbre est inférieure à une vitesse-seuil Vs déterminée, c'est-à-dire Va < Vs, alors le galet rotatif reste au contact de la came rotative durant la rotation de l'arbre.
  • lorsque la vitesse de rotation Va de l'arbre est ou devient supérieure ou égale à la vitesse-seuil Vs déterminée, soit Va ≥ Vs, alors le galet rotatif est repoussé par la came en éloignement par rapport à ladite came rotative en provoquant un basculement du bras pivotant et l'engagement du cliquet dans l'une des encoches de la roue à rochet.
  • l'engagement du cliquet dans l'une des encoches de la roue à rochet engendre un basculement du levier relié par pivotement au bras pivotant portant le cliquet et le galet rotatif.
  • le galet rotatif coopère avec le rail de guidage de l'élément de contre-came pour arrêter ledit basculement du levier, de préférence le galet rotatif vient en butée contre le rail de guidage de l'élément de contre-came.
  • lorsque le galet rotatif vient au contact du rail de guidage de l'élément de contre-came, le cliquet se désengage de l'encoche de la roue à rochet.
  • le rail de guidage et l'élément de contre-came forment une pièce unique.
  • l'élément de contre-came comprend en outre une butée terminale apte à et conçue pour stopper le mouvement rotatif excessif du galet le long du rail de guidage.
Depending on the case, the system or device of the invention may include one or more of the following features:
  • the rotary cam comprises a central body provided with one or more radial projections disposed around the periphery of said body and protruding outwards, that is to say projecting radially away from the axis of rotation of the the rotating cam.
  • when the rotation speed Va of the shaft is less than a determined threshold speed Vs, that is to say Va <Vs, then the rotary roller remains in contact with the rotating cam during the rotation of the shaft.
  • when the rotation speed Va of the shaft is or becomes greater than or equal to the determined threshold speed Vs, ie Va ≥ Vs, then the rotary roller is pushed by the cam away from said rotary cam, causing a tilting pivoting arm and engagement of the pawl in one of the notches of the ratchet wheel.
  • the engagement of the pawl in one of the notches of the ratchet wheel causes a tilting of the lever pivotally connected to the pivoting arm carrying the pawl and the rotary roller.
  • the rotary roller cooperates with the guide rail of the cam member member to stop said tilting of the lever, preferably the rotary roller abuts against the guide rail of the cam member element.
  • when the rotary roller comes into contact with the guide rail of the cam member, the pawl disengages from the notch of the ratchet wheel.
  • the guide rail and the cam follower element form a single piece.
  • the cam follower member further comprises a terminal stop adapted and adapted to stop excessive rotational movement of the roller along the guide rail.

L'invention porte en outre sur une installation avec plateforme pour opérateur embarqué, mobile verticalement, caractérisée en ce qu'elle est équipée d'un système de sécurité selon l'invention. En fait, sont concernées, les installations comprenant une plateforme, y compris une nacelle ou analogue, supportant un ou plusieurs opérateurs et qui sont conçues pour et aptes à être descendues ou remontées verticalement, par exemple un ascenseur ou une plateforme mobile le long d'un mât, ou tout système d'élévation de personne utilisant un système de guidage linéaire fixe auquel on peut rattacher une crémaillère, et concerné par les normes NF EN 1495, NF EN 280 et NF EN 14502-2 ; de telles installations peuvent être utilisées par exemple pour des opérations de nettoyage ou d'entretien des surfaces externes peuvent être utilisées par exemple pour des opérations de nettoyage ou d'entretien des surfaces externes d'immeubles, notamment pour le nettoyage des surfaces vitrées ou encore la mise en peinture de revêtements externes ou internes, voire de plafonds.The invention further relates to an installation with a vertically movable operator platform, characterized in that it is equipped with a safety system according to the invention. In fact, are concerned, facilities comprising a platform, including a nacelle or the like, supporting one or more operators and which are designed for and able to be lowered or raised vertically, for example an elevator or a mobile platform along a mast, or any person raising system using a fixed linear guide system to which a rack can be attached, and concerned by standards NF EN 1495, NF EN 280 and NF EN 14502-2; such installations may be used for example for cleaning or maintenance of external surfaces can be used, for example, for cleaning or maintenance of external surfaces of buildings, in particular for cleaning glazed surfaces or painting external or internal coatings, or even ceilings.

Plus particulièrement, l'invention porte sur une potence à bras-porteur mobile le long d'un mât vertical, en particulier une potence de soudage à opérateur embarqué, caractérisée en ce qu'elle est équipée d'un système de sécurité selon l'invention.More particularly, the invention relates to a mobile arm-bearing bracket along a vertical mast, in particular an on-board welding bracket, characterized in that it is equipped with a safety system according to the invention. invention.

De préférence, la potence comporte en outre un dispositif mobile intermédiaire coulissant le long du mât portant le bras, le système de sécurité et un dispositif de freinage, le pignon de l'arbre rotatif dudit système de sécurité coopérant avec une crémaillère portée par le mât vertical, et l'extrémité libre du levier pivotant étant apte à et conçue pour venir actionner le dispositif de freinage, lorsque la vitesse de rotation Va transmise par le pignon à l'arbre, lorsque ledit pignon se déplace le long de la crémaillère, est ou devient supérieure ou égale à la vitesse-seuil Vs déterminée de rotation de l'arbre.Preferably, the bracket also comprises an intermediate mobile device sliding along the mast carrying the arm, the safety system and a braking device, the pinion of the rotary shaft of said security system cooperating with a rack carried by the mast. vertical, and the free end of the pivoting lever being adapted to and adapted to actuate the braking device, when the rotational speed Va transmitted by the pinion to the shaft, when said pinion moves along the rack, is or becomes greater than or equal to the determined threshold speed Vs of rotation of the shaft.

Par ailleurs, l'invention porte aussi sur un procédé de soudage, en particulier à l'arc submergé, dans lequel on utilise une potence selon l'invention.Furthermore, the invention also relates to a welding method, in particular to the submerged arc, in which a bracket according to the invention is used.

L'invention va être maintenant décrite plus en détail en références aux Figures annexées parmi lesquelles :

  • la Figure 1 représente une potence de soudage à opérateur embarqué équipée d'un système de sécurité selon la présente invention,
  • la Figure 2 est une vue grossie d'une partie de la potence de la Figure 1 faisant apparaître le système de sécurité selon la présente invention,
  • les Figures 3 et 4 détaillent le système de sécurité selon la présente invention,
  • les Figures 5A à 5D illustrent le fonctionnement du système de sécurité selon la présente invention et
  • la Figure 6 illustre des applications de soudage possibles d'une potence selon la Figure 1.
The invention will now be described in more detail with reference to the appended figures among which:
  • the Figure 1 represents an onboard operator welding bracket equipped with a safety system according to the present invention,
  • the Figure 2 is a magnified view of part of the gallows of the Figure 1 showing the security system according to the present invention,
  • the Figures 3 and 4 detail the security system according to the present invention,
  • the Figures 5A to 5D illustrate the operation of the security system according to the present invention and
  • the Figure 6 illustrates possible welding applications of a stem according to the Figure 1 .

La Figure 1 schématise un mode de réalisation d'une potence 20 industrielle de soudage à l'arc submergé de parties ou sous-unités de structures métalliques de grandes dimensions, par exemple de viroles de 3 à 10 mètres de diamètre (mesuré au niveau du plan de joint), soudées les unes à la suite des autres, c'est-à-dire raboutées, pour constituer un mât d'éolienne, laquelle est équipée d'un système de sécurité selon l'invention (désigné par la référence générale 100).The Figure 1 schematizes an embodiment of an industrial bracket for submerged arc welding of parts or subunits of large metal structures, for example ferrules 3 to 10 meters in diameter (measured at the joint plane). ), welded one after the other, that is to say, rabbits, to form a wind turbine mast, which is equipped with a security system according to the invention (designated by the general reference 100).

Cette potence 20 de soudage comprend un mât vertical 21 qui supporte un bras-porteur 22 mobile verticalement, c'est-à-dire de bas en haut, sur le mât 21 par le biais d'un dispositif mobile intermédiaire 25 coulissant le long du mât, encore appelé coulisseau mobile, sur lequel est fixé le bras-porteur 22. Le bras-porteur 22 porte à son extrémité libre 22a, les différents équipements nécessaires pour réaliser et contrôler le soudage, à savoir notamment torche de soudage, un système d'amenée de flux et de fil de soudage, un système de suivi de joint, un système de vision...., ainsi qu'un opérateur 30 embarqué qui sert à positionner et à piloter les équipements soudage et à s'assurer du bon déroulement de l'opération de soudage, notamment au cours de l'exécution des différentes passes successives.This welding bracket 20 comprises a vertical mast 21 which supports a carrier arm 22 that can move vertically, that is to say from below upwards, on the mast 21 by means of an intermediate mobile device 25 sliding along the mast, still called a mobile ram, on which the support arm 22 is fixed. The carrying arm 22 carries at its free end 22a, the various equipment necessary for producing and controlling the welding, namely in particular a welding torch, a flux feed system and welding wire. , a seal monitoring system, a vision system .... and an onboard operator 30 which is used to position and control the welding equipment and to ensure the smooth running of the welding operation, in particular during the execution of the different successive passes.

Le déplacement du bras-porteur 22 le long du mât 21 se fait de manière connue en soi grâce à un système motorisé comprenant un jeu de chaines et de pignons entraînés par un motoréducteur.The movement of the carrier arm 22 along the mast 21 is done in a manner known per se by means of a motorized system comprising a set of chains and pinions driven by a geared motor.

Comme détaillé en Figure 2, le mât 21 comporte une crémaillère 24 destinée à coopérer avec le système de sécurité 100 de l'invention, comme expliqué ci-après, ainsi qu'un rail d'arrêt 23 coopérant avec un dispositif de freinage 50 ou parachute mécanique susceptible d'être actionné, c'est-à-dire déclenché, par le système de sécurité 100 de l'invention en cas de chute intempestive du bras-porteur 22.As detailed in Figure 2 the mast 21 comprises a rack 24 intended to cooperate with the safety system 100 of the invention, as explained hereinafter, as well as a stop rail 23 cooperating with a braking device 50 or mechanical parachute capable of be actuated, that is to say triggered, by the safety system 100 of the invention in case of inadvertent fall of the carrier arm 22.

Plus précisément, comme illustré sur les Figures 3 et 4, le système de sécurité 100 de l'invention comprend un arbre 4 rotatif d'axe AA, de forme générale cylindrique, portant un pignon 5, une roue à rochet 1 et une came rotative 2, ces éléments étant fixés solidairement à l'arbre 4.More specifically, as illustrated in Figures 3 and 4 , the security system 100 of the invention comprises a rotary shaft 4 of axis AA, of generally cylindrical shape, carrying a pinion 5, a ratchet wheel 1 and a rotary cam 2, these elements being integrally fixed to the shaft 4.

Le pignon 5 lorsqu'il se déplace dans la crémaillère 24 du mât 21, entraîne en rotation l'arbre 4 sur lequel il est agencé, lequel arbre 4 entraîne alors la roue à rochet 1 et la came rotative 2 qui sont agencés solidairement sur celui-ci. L'arbre 4, le pignon 5, la roue à rochet 1 et la came rotative 2 forment en fait un ensemble solidaire en rotation.The pinion 5 when it moves in the rack 24 of the mast 21, rotates the shaft 4 on which it is arranged, which shaft 4 then drives the ratchet wheel 1 and the rotary cam 2 which are arranged integrally on the -this. The shaft 4, the pinion 5, the ratchet wheel 1 and the rotary cam 2 form in fact an assembly integral in rotation.

Le système de sécurité 100 comporte en outre un levier pivotant 3, ainsi qu'un élément de contre-came 9 fixe.The security system 100 further comprises a pivoting lever 3 and a fixed cam member 9.

Le levier pivotant 3 est de forme allongée et est doté d'une première extrémité 3a libre susceptible d'actionner le dispositif de sécurité 50, et une deuxième extrémité 3b portant un bras pivotant 6, qui lui-même porte un cliquet 7 à l'une de ses extrémités et un galet rotatif 8 à son autre extrémité.The pivoting lever 3 is of elongate shape and has a free first end 3a capable of actuating the safety device 50, and a second end 3b carrying a pivoting arm 6, which itself carries a pawl 7 to the one of its ends and a rotating roller 8 at its other end.

Le levier pivotant 3 pivote ou bascule préférentiellement autour de l'axe AA de l'arbre 4. Pour ce faire, il peut être constitué d'une pièce de forme oblongue percée en son centre d'un orifice de passage traversé par l'arbre 4.The pivoting lever 3 pivots or tilts preferentially about the axis AA of the shaft 4. To do this, it may consist of an oblong-shaped part pierced at its center with a passage through which the shaft passes. 4.

Par ailleurs, le bras pivotant 6 pivote ou bascule autour d'un axe BB distinct de l'axe AA mais préférentiellement parallèle ou quasi parallèle audit axe AA.Furthermore, the pivoting arm 6 pivots or tilts about an axis BB distinct from the axis AA but preferably parallel or almost parallel to said axis AA.

La roue à rochet 1 est formée d'un corps ou roue munie sur tout son pourtour d'une ou plusieurs encoches 11 destinées à coopérer avec le cliquet 7 du bras pivotant 6 comme expliqué ci-après et illustré sur les Figures 5A à 5D.The ratchet wheel 1 is formed of a body or wheel provided all around its periphery with one or more notches 11 intended to cooperate with the pawl 7 of the pivoting arm 6 as explained hereinafter and illustrated in FIGS. Figures 5A to 5D .

Par ailleurs, la came rotative 2 comprend, quant à elle, un corps central 16 muni d'une ou plusieurs projections radiales 12 ou dents disposées sur le pourtour dudit corps 16 et faisant saillie vers l'extérieur.Moreover, the rotary cam 2 comprises, in turn, a central body 16 provided with one or more radial projections 12 or teeth disposed around the periphery of said body 16 and projecting outwards.

Le galet rotatif 8 est apte à et conçu pour coopérer avec la came 2 rotative pour détecter une variation brusque de vitesse au-delà d'une valeur-seuil Vs donnée, correspondant à une chute inopinée du bras-porteur 2, puis avec le rail 19 de l'élément de contre-came 9 après pivotement du levier pivotant 3 et actionnement du dispositif de sécurité 50 servant à arrêter la chute.The rotary roller 8 is adapted to and designed to cooperate with the rotary cam 2 to detect a sudden speed variation beyond a given threshold value Vs, corresponding to an unexpected fall of the carrying arm 2, then with the rail 19 of the follower member 9 after pivoting the pivoting lever 3 and actuating the safety device 50 for stopping the fall.

Plus précisément, lorsque le bras-porteur 22 21descend le long du mât 21, ce mouvement de descente est transmis par l'intermédiaire de la crémaillère 24 de la Figure 1 ou 2, au pignon 5 porté par le bras 4, lequel pignon 5 est alors entraîné en rotation et entraîne avec lui en rotation l'arbre 4, donc aussi la roue à rochet 1 et la came rotative 2.More specifically, when the arm-carrier 22 21depends along the mast 21, this downward movement is transmitted via the rack 24 of the Figure 1 or 2 , at the pinion 5 carried by the arm 4, which pinion 5 is then rotated and drives with it in rotation the shaft 4, thus also the ratchet wheel 1 and the rotary cam 2.

Comme illustré sur la Figure 5A, tant que la vitesse de descente du bras-porteur 22 le long du mât 21 est normale, la rotation de l'arbre 4 est également normale, c'est-à-dire la vitesse de rotation Va du pignon 5 et donc de l'arbre 4 reste inférieure à une vitesse-seuil Vs (Va < Vs) et le galet rotatif 8 reste en contact permanent ou quasi-permanent de la came rotative 2 et va rouler sur le contour périphérique de la came 2, en particulier suivre le profil formé par les projections 12 ou dents en saillies.As illustrated on the Figure 5A , as long as the speed of descent of the carrier arm 22 along the mast 21 is normal, the rotation of the shaft 4 is also normal, that is to say the speed of rotation Va of the pinion 5 and therefore the 4 remains lower than a threshold speed Vs (Va <Vs) and the rotary roller 8 remains in permanent or quasi-permanent contact with the rotary cam 2 and will roll on the peripheral contour of the cam 2, in particular follow the profile formed by projections 12 or protruding teeth.

Comme illustré sur la Figure 5B, en cas de chute du bras-porteur 22, la vitesse de descente du bras-porteur 22 le long du mât 21 augmente brusquement, ce qui se traduit par une augmentation subite de la vitesse de rotation du pignon 5 du fait d'une accélération de son déplacement dans la crémaillère 24 causée par la chute du bras-porteur 22. Cette augmentation rapide de la vitesse de rotation du pignon 5 engendre alors également une augmentation rapide de la vitesse de rotation de l'arbre Va qui devient brusquement supérieure ou égale à la vitesse-seuil Vs déterminée (Va>Vs).As illustrated on the Figure 5B in the event of the carrier arm 22 falling, the speed of descent of the carrying arm 22 along the mast 21 increases sharply, which results in a sudden increase in the speed of rotation of the pinion 5 due to an acceleration its displacement in the rack 24 caused by the fall of the carrier arm 22. This rapid increase in the speed of rotation of the pinion 5 then also causes a rapid increase in the speed of rotation of the shaft Va which suddenly becomes greater than or equal to at the determined threshold speed Vs (Va> Vs).

A titre d'exemple, la vitesse-seuil Vs peut être comprise entre 2 et 5 m/min. Toutefois, la vitesse peut être adaptée au cas par cas par simple changement du diamètre du pignon d'entraînement 5.By way of example, the threshold speed Vs can be between 2 and 5 m / min. However, the speed can be adapted case by case by simply changing the diameter of the drive pinion 5.

Cette accélération de rotation de l'arbre 4 et donc de la came rotative 2 va produire une action centrifuge de la came 2 qui va aller repousser brusquement le galet 8 dans une direction radiale tendant à l'éloigner de la came 2.This acceleration of rotation of the shaft 4 and thus of the rotary cam 2 will produce a centrifugal action of the cam 2 which will push the roller 8 sharply in a radial direction tending to move it away from the cam 2.

Le galet rotatif 8 qui est violemment repoussé par la came 2 en éloignement par rapport à celle-ci, va provoquer un basculement du bras pivotant 6 sur lequel il est agencé, et dans le même temps un mouvement de rapprochement du cliquet 7 porté par l'autre extrémité du bras pivotant 6 en direction de la roue à rochet 1, et l'engagement dudit cliquet 7 dans l'une des encoches 11 de la roue à rochet 1.The rotary roller 8 which is violently pushed by the cam 2 away from it, will cause a tilting of the pivoting arm 6 on which it is arranged, and at the same time a movement of approaching the pawl 7 carried by the other end of the pivoting arm 6 in the direction of the ratchet wheel 1, and the engagement of said pawl 7 in one of the notches 11 of the ratchet wheel 1.

Comme montré en Figure 5C, le cliquet 7 une fois engagé dans l'une des encoches 11 et le bras pivotant 6 qui le porte vont alors être soumis au mouvement rotatif de l'arbre 4 sur lequel est fixée la roue à rochet 1 et par conséquent être entraînés selon une trajectoire courbe, par ladite roue à rochet 1.As shown in Figure 5C , the pawl 7 once engaged in one of the notches 11 and the pivoting arm 6 which carries it will then be subjected to the rotary movement of the shaft 4 on which is fixed the ratchet wheel 1 and therefore be driven according to a Curved trajectory, by said ratchet wheel 1.

L'entraînement du bras 6 et du galet 8 par la roue 1 va alors provoquer un basculement du levier 3 qui porte le bras 6. En basculant, le levier 3 va alors actionner le système de freinage ou parachute mécanique 50 de manière à déclencher son fonctionnement est stopper le mouvement de chute brutale du bras-porteur 2.The drive of the arm 6 and the roller 8 by the wheel 1 will then cause a tilting of the lever 3 which carries the arm 6. By rocking, the lever 3 will then actuate the braking system or mechanical parachute 50 so as to trigger its operation is to stop the sudden fall of the arm-carrier 2.

Par ailleurs, comme montré sur la Figure 5D, le basculement du levier 3 autour de l'axe AA est stoppé lorsque le galet rotatif 8 vient coopérer avec le rail de guidage 19 de l'élément de contre-came 9 fixe, en pour arrêter ledit basculement du levier 3, ce qui va en outre désengager le cliquet 7 de l'encoche 11 de la roue à rochet 1 et le levier 3 n'est alors plus sollicité. En fait, le profil du rail de guidage 19 de l'élément de contre-came 9 fait office de contre-came à proprement parler.Moreover, as shown on the Figure 5D , the tilting of the lever 3 about the axis AA is stopped when the rotary roller 8 cooperates with the guide rail 19 of the cam member against fixed 9, to stop said tilting of the lever 3, which will further disengage the pawl 7 of the notch 11 of the ratchet wheel 1 and the lever 3 is then no longer required. In fact, the profile of the guide rail 19 of the counter-cam member 9 serves as a counter-cam itself.

Il est à noter que l'élément de contre-came 9 porte également une butée de terminale 19' permettant de stopper une course excessive du galet 8 le long du rail de guidage 19. Toutefois, en fonctionnement normal, le rail de guidage 19 faisant office de contre-came permet à lui seul de stopper le mouvement du galet 8.It should be noted that the follower member 9 also carries a terminal stop 19 'for stopping an excessive stroke of the roller 8 along the guide rail 19. However, in normal operation, the guide rail 19 cam follower alone allows to stop the movement of the roller 8.

Le rail de guidage 19 et l'élément de contre-came 9 sont formés d'une pièce unique, de préférence la butée terminale 19' est formée également au sein de cette pièce unique.The guide rail 19 and the follower member 9 are formed of a single piece, preferably the end stop 19 'is also formed within this single piece.

Après déclenchement, le système de sécurité 100 de l'invention doit être réarmé de façon manuelle.After triggering, the security system 100 of the invention must be rearmed manually.

Le système de sécurité 100 de l'invention peut équiper différents types d'installation avec plateforme embarquée mobile verticalement.The security system 100 of the invention can equip different types of installation with vertically mobile embedded platform.

A titre d'exemple, comme illustré sur la Figure 6, une potence 20 équipée d'un système de sécurité selon l'invention peut être utilisée pour souder 60 des structures tridimensionnelles de grandes dimensions, c'est-à-dire de plusieurs mètres de diamètres, que la soudure soit circulaire 61, par exemple pour assembler deux viroles circulaires ou tronconiques 63, 64 l'une à l'autre, ou linéaire 62, par exemple pour réaliser la soudure de fermeture d'une virole. La potence 20 peut être posée ou fixée sur le sol ou, le cas échéant, mobile sur des rails, des roues ou analogues.For example, as illustrated on the Figure 6 , a bracket 20 equipped with a security system according to the invention can be used to weld 60 three-dimensional structures of large dimensions, that is to say several meters in diameter, the weld is circular 61, for example to assemble two circular or frustoconical ferrules 63, 64 to one another, or linear 62, for example to make the closing weld of a ferrule. The bracket 20 may be placed or fixed on the ground or, where appropriate, movable on rails, wheels or the like.

Claims (11)

  1. Safety system (100) comprising:
    - a rotatable shaft (4) having an axis AA and carrying a pinion (5), a ratchet wheel (1) and a rotatable cam (2),
    - a pivoting lever (3) having a first free end (3a) and a second end (3b) carrying a pivoting arm (6), said pivoting arm (6) comprising a pawl (7) and a rotatable roller (8), and
    - a cam follower element (9) comprising a guide rail (19),
    wherein the pivoting lever (3) pivots about the axis AA of the shaft (4), the pawl (7) of the pivoting arm (6) is capable of and designed for cooperating with one or more notches (11) on the ratchet wheel (1), and the rotatable roller (8) is capable of and designed for cooperating with the rotatable cam (2) or with the guide rail (19) of the cam follower element (9).
  2. Safety system according to any of the preceding claims, characterised in that the pivoting arm (6) pivots about an axis BB which is parallel to the axis AA of the shaft (4).
  3. Safety system according to any of the preceding claims, characterised in that the rotatable cam (2) comprises a central body (16) which is equipped with one or more radial projections (12) which are arranged over the periphery of said body (16) and project outwards.
  4. Safety system according to any of the preceding claims, characterised in that, when the rotational speed (Va) of the shaft (4) is less than a determined threshold speed (Vs), the rotatable roller (8) thus remains in contact with the rotatable cam (2) during rotation of the shaft (4).
  5. Safety system according to any of the preceding claims, characterised in that, when the rotational speed (Va) of the shaft (4) is or becomes greater than or equal to the determined threshold speed (Vs), the rotatable roller (8) is pushed by the cam (2) away from said rotatable cam (2), causing the pivoting arm (6) to tilt and the pawl (7) to engage in one of the notches (11) in the ratchet wheel (1).
  6. Safety system according to any of the preceding claims, characterised in that the engagement of the pawl (7) in one of the notches (11) in the ratchet wheel (1) causes tilting of the lever (3) which is pivotally connected to the pivoting arm (6) which carries the pawl (7) and the rotatable roller (8).
  7. Safety system according to any of the preceding claims, characterised in that, after the lever (3) tilts, the rotatable roller (8) cooperates with the guide rail (19) of the cam follower element (9) to stop said tilting of the lever (3), and preferably the rotatable roller (8) comes into abutment with the guide rail (19) of the cam follower element (9).
  8. Safety system according to any of the preceding claims, characterised in that, when the rotatable roller (8) comes into contact with the guide rail (19) of the cam follower element (9), the pawl (7) disengages from the notch (11) in the ratchet wheel (1).
  9. Installation comprising a vertically movable operator's platform, characterised in that it is provided with a safety system (100) according to any of the preceding claims.
  10. Jib crane (20) having a carrying arm (22) which is movable along a vertical mast (21), in particular a welding jib crane (20) having an on-board operator (30), characterised in that it is provided with a safety system (100) according to any of claims 1 to 8.
  11. Jib crane (20) according to claim 10, characterised in that it further comprises an intermediate movable device (25) which slides along the mast carrying the arm, the safety system (100) and a braking device (50), the pinion (5) of the rotatable shaft (4) of said safety system (100) cooperating with a rack (24) carried by the vertical mast (21), and the free end (3a) of the pivoting lever (3) being capable of and designed for actuating the braking system (50) when the rotational speed (Va) transmitted by the pinion (5) to the shaft (4) when said pinion (5) moves along the rack (24) is or becomes greater than or equal to the determined threshold rotational speed (Vs) of the shaft (4).
EP12169419.4A 2011-06-06 2012-05-25 Security system for a vertically movable platform for a workman Not-in-force EP2532616B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1154872A FR2975983B1 (en) 2011-06-06 2011-06-06 SAFETY SYSTEM FOR VERTICALLY MOBILE OPERATOR PLATFORM

Publications (2)

Publication Number Publication Date
EP2532616A1 EP2532616A1 (en) 2012-12-12
EP2532616B1 true EP2532616B1 (en) 2015-07-01

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Application Number Title Priority Date Filing Date
EP12169419.4A Not-in-force EP2532616B1 (en) 2011-06-06 2012-05-25 Security system for a vertically movable platform for a workman

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EP (1) EP2532616B1 (en)
FR (1) FR2975983B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043395B1 (en) 2015-11-06 2017-11-10 Commissariat Energie Atomique MICROELECTRONIC DEVICE
CN113603033B (en) * 2020-07-14 2022-11-04 青铜峡铝业发电有限责任公司 Elevator speed limiting device and method for power maintenance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1155348A (en) * 1966-09-28 1969-06-18 Demag Zug Gmbh Safety Device for Preventing Crashing of Slides or Carriages in Stacking Cranes, Lift Trucks, and the like
FR2453105A1 (en) * 1979-04-04 1980-10-31 Demag Ag Mannesmann SECURITY DEVICE FOR AN APPARATUS FOR SERVING SHELVES
US5513723A (en) * 1994-07-01 1996-05-07 Harnischfeger Corporation Double-masted crane with improved brake arrangement
CA2547286C (en) * 2006-05-19 2015-09-15 Gerard Noel Braking device for elevating platform assembly

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FR2975983B1 (en) 2013-07-05
FR2975983A1 (en) 2012-12-07
EP2532616A1 (en) 2012-12-12

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