EP0565605B1 - Self-raising platform - Google Patents

Self-raising platform Download PDF

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Publication number
EP0565605B1
EP0565605B1 EP92903292A EP92903292A EP0565605B1 EP 0565605 B1 EP0565605 B1 EP 0565605B1 EP 92903292 A EP92903292 A EP 92903292A EP 92903292 A EP92903292 A EP 92903292A EP 0565605 B1 EP0565605 B1 EP 0565605B1
Authority
EP
European Patent Office
Prior art keywords
platform
carriage
plate
mast
rack
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.)
Expired - Lifetime
Application number
EP92903292A
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German (de)
French (fr)
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EP0565605A1 (en
Inventor
Xavier Lombard
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.)
HEK France SARL
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HEK France SARL
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Publication date
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Publication of EP0565605A1 publication Critical patent/EP0565605A1/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00Scaffolds primarily resting on the ground
    • E04G1/18Scaffolds primarily resting on the ground adjustable in height
    • E04G1/20Scaffolds comprising upright members and provision for supporting cross-members or platforms at different positions therealong
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F11/00Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04Lifting 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

Definitions

  • the invention relates to self-elevating platforms or cabins used for the construction, renovation and exterior maintenance of buildings of significant height (typically several tens of meters in height).
  • platform here also means elevation machines, in particular modular machines, which also includes passenger elevators.
  • building is meant here residential or administrative or industrial constructions, etc., but also, by extension, other structures in which self-elevating platforms may be necessary, for example ships in dry dock for construction, maintenance or repair.
  • the object of the invention is to propose improvements to the structures of existing jack-up platforms, in order to bring there improvements in particular in terms of safety, solidity, and ease of use.
  • a self-lifting platform structure which comprises two vertical masts spaced from each other, each provided with a rack, with a movable carriage mounted on each mast and sliding along this mast, each carriage carrying a motor respective cooperating with the rack, and a platform integral with the two carriages, mounted on each carriage, is provided an auxiliary toothed pinion which cooperates with the rack and which is rotated when the carriage moves, a transmission shaft extending between the two masts and which connects the auxiliary toothed pinions of the two carriages so that they rotate in synchronism, characterized in that each carriage includes a housing for a vertical movable plate which carries the motor and which can move vertically in this housing, with springs between the plate and the housing to allow a damped transmission of the force exerted by the plate on the carriage under the action of the motor cooperating with the rack, and in that at least one detector is provided in each carriage for detecting the compression of the transmission springs, this detector being connected to a control of the two motors
  • FIG 1 to understand the context of the invention, there is shown a general view of a lifting structure of a self-elevating platform with two masts, placed along the facade of a building under construction or in renovation.
  • This structure makes it possible to mount a work platform along this facade at any desired height, as and when required.
  • the working platform is designated by the reference 10. It extends between two masts 12 and 14 and even partly cantilevered beyond the masts.
  • the platform is of course fitted with all the safety barriers necessary to protect the people working on the platform and those below it (protection against falling objects).
  • the masts are supported at their base on the ground, in principle by means of supports, 16 and 18 respectively, in the form of plates kept horizontal by adjustable jacks 20 resting on the ground.
  • the masts are fixed from place to place (for example every 5 meters) to the facade of the building, by anchors 22 strong enough to withstand the tensile and torsional forces exerted on the masts by the weight and the movements of the platform 10.
  • the movement of the platform is ensured by electric motors carried by the platform itself, motors which cooperate with rack and pinion carried by the masts.
  • a rack 28 is visible on the right mast 14. That of the mast 12 is not shown in FIG. 1.
  • Each carriage carries at least one electric motor coupled to a reduction gear, with at least one toothed pinion cooperating with the corresponding rack to ensure, during the rotation of the motor, movement of the carriage.
  • the motors are connected by electric power cables 30 to a power source 32.
  • the motor control is preferably located on the platform, so that the occupants can maneuver it themselves; but it is also possible to provide a command from below or a double command, both from below and by the occupants.
  • Figure 2 shows cooperation of an engine and rack.
  • the gear pinion output from the reducer designated by the reference 40, has teeth 42 which mesh with the teeth 44 of the rack 28; the teeth 44 of the rack are machined in a first face of a metal bar which is welded or bolted all along the hoist mast.
  • a pressing roller 48 comes to bear against an opposite face 46 of this bar to keep the teeth of the pinion 40 nested in the teeth of the rack.
  • roller 48 and the pinion 40 are both rotatably mounted on a common metal plate 50.
  • the motor and the reduction gear (not visible because placed behind the plate) are fixed on the plate 50. There is no no play or practically no play between the roller 48 and the pinion 40 so that there is no risk of disengagement of the gear.
  • the plate 50 will therefore be the main drive member of the platform on the hoist mast.
  • the arrangement is identical on the two masts.
  • this plate 50 is not directly integral with the carriage (or drive unit) 24 or 26 of FIG. 1.
  • the structure which makes it possible to drive the carriage 26 from the plate 50 is shown in FIG. 3 Unlike Figure 2 which is a horizontal view, the view of Figure 3 is a top view.
  • the carriage 26, which is integral with the platform 10, comprises for example metal plates 52 or a profile constituting its main framework.
  • the platform is secured by any conventional means (welding, bolts, rivets, etc.) to this frame.
  • the rack 28 is welded or bolted to the mast 14 whose framework is also seen in Figure 3.
  • a housing 54 has been provided for the drive plate 50, housing in which the latter can slide vertically over a certain distance (a few centimeters or tens of centimeters at most) and horizontally (of the order of a centimeter ).
  • the housing 54 is defined for example by metal plates or profiles 56 welded or bolted to the frame 52 of the carriage.
  • the pressure roller 48 is also rigidly fixed to the plate in a position such that it comes to bear against the non-toothed face of the rack. This roller turns freely around an axis which crosses the plate.
  • the motor drives a first toothed pinion 41 which is not coupled to the rack, this first pinion driving two identical satellite pinions 43 and 45 rotating in the same way; the latter are coupled to the rack and two pressure rollers 47 and 49 are placed on the other side of the rack, opposite the pinions 43 and 45 respectively.
  • the transmission of effort is better distributed.
  • the radial force exerted on the gear motor is eliminated.
  • the invention with floating plate and double satellite pinion, aims to distribute the force equally on the two pinions.
  • the torques generated at the level of the guide carriages are much greater than those generated by the recoil or the advancement of the teeth meshing in the rack.
  • the force transmitted between a satellite pinion and the rack varies from zero to 100% depending on whether this pinion is more buried than the other or at the junction of two racks, the pitch changes. In this case one of the pinions works more than the other.
  • the pinions are automatically adjusted by entering or leaving more or less the rack, as the boogies distribute the effort equally (50% -50%) on two rollers or wheels.
  • FIG. 5 represents a horizontal view, perpendicular to the plate 50, showing the plate in its housing 54, and especially showing the connection by springs between the plate and this housing.
  • horizontal walls 60 close the upper part of the housing 54; springs, for example two springs 62 and 64, are placed between the plate 50 and these walls upper horizontal.
  • the plate can exert an action on the walls 60 and more generally on the carriage 26 or the platform 10 only by means of these movement transmission springs. The transmission is therefore damped and there is no shock when the engines are started.
  • the springs can be replaced by silent blocks or even gas shock absorbers.
  • the plate is separated from the lower horizontal walls 66 of the housing 54 by means of springs 68 and 70.
  • the plate can slide vertically in its housing, but it must then exert a compressive force on the springs.
  • the state of compression of the springs can be measured either by deformation detectors, such as strain gauges, or by detectors of displacement of the plate relative to the housing.
  • deformation detectors such as strain gauges
  • detectors of displacement of the plate relative to the housing Such detectors are provided, and are designated by the reference 72. They serve according to the invention to provide security. They can be simple so-called limit switches, but are preferably strain gauges.
  • twin mast machines either with independent motors not linked by a synchronization order, or with central motors, the movement is distributed symmetrically. But in the first case, it is not possible to guarantee mechanical synchronization between the two motor elements (synchronization does not offer any guarantee in the event of failure of the latter or in the event of manual descent intervention with no electricity).
  • the invention makes it possible to remedy all known risks of damage.
  • the detectors 72 can precisely serve to detect an exaggerated compression of the springs, sign of an exaggerated resistance opposed by the platform to the movement that one seeks to impart to it.
  • the springs allow in any case to start and stop smoothly: they dampen the acceleration of the engine.
  • the platform continues to rise on one side only, the other being stopped or even tending to descend.
  • the effort exerted on the rising side will be much greater; the detector 72 can be used to urgently interrupt the supply of the engine which continues to run.
  • the platform cannot start. You have to either unload a part, or better distribute the load to be able to start. It should be noted that an audible and / or luminous alarm can be provided to warn of an overload, even when static.
  • each geared motor being calculated to hold the total load, and the synchronization shaft being calculated to also transmit all the load, the platform is stopped instantly and only a manual descent is possible to descend and remedy the damage safely.
  • the motors are provided with centrifugal brakes which limit the descent speed of the platform to an acceptable value. It is also possible to provide automatic blocking systems released in the event of a power outage, for example cam cleats, self-locking cams, brake pads. integral with the carriage and applied strongly against the rack to slow down the descent.
  • the invention is particularly advantageous in combination with eddy current brakes (comprising a metal disc, generally of copper, rotating in the air gap of a magnet).
  • eddy current brakes comprising a metal disc, generally of copper, rotating in the air gap of a magnet.
  • These brakes can be mounted either on the motor pinion or on the synchronization shaft itself.
  • Figures 16 and 17 show such a device where a motor 58 has at the end of the shaft a metal disc 145 rotating in the air gap of a magnet 146.
  • an electric actuator 147 moves the permanent magnet away from the copper disc and then, after checking by a position contact, the motor starts.
  • the permanent magnet is replaced by the push of a spring 148.
  • the descent is regulated by the electromotive forces generated in the copper disc secured to the motor shaft.
  • an auxiliary pinion is provided, carried by the carriage, cooperating with the rack. But under normal operating conditions, this pinion does not drive the carriage. On the contrary, it is rotated by the movement of the carriage. Climbing, the carriage moves relative to the rack, and this movement therefore rotates the auxiliary pinion.
  • the auxiliary pinion 80 is mounted on a second plate 90.
  • This plate 90 is preferably secured to the carriage. But it can be similar to the plate 50, sliding in a housing 94 similar to the housing 54, this housing being integral with the carriage. damping springs are also provided between the plate 90 and the housing 94. In this case, its condition is also monitored by a detector 72 bis of the same type as the detector 72.
  • the auxiliary pinion and its roller are mounted on the same plate 50 as the main drive pinion if it is possible from the point of view of space.
  • the plate 90 carrying the auxiliary pinion is not necessarily mounted in a floating manner (that is to say by means of springs) like the plate 50. It is moreover possible while the auxiliary pinion is directly mounted on the carriage and not on a movable plate.
  • auxiliary pinion 80 is directly coupled to a drive shaft which extends between the two masts 12 and 14 and which is connected on the other side to the corresponding auxiliary pinion.
  • the two auxiliary gears are therefore directly coupled in rotation.
  • the references are the same as in the previous figures for the mast 14.
  • the references are the same with the index "prime"; thus, the rack for the mast 12 is designated by 28 '.
  • the carriages 26 and 24 are not shown; but they are connected to the auxiliary plates 90 and 90 'by springs, as has been explained.
  • the transmission shaft which can also be called synchronization shaft, is designated by 100. It extends over the entire length separating the masts 12 and 14 in FIG. 1.
  • auxiliary pinions rotate in synchronism, each driven by the movement of the corresponding carriage, since the two motors operate and rotate at the same speed.
  • the platform rises or falls horizontally.
  • parachute brake can also be mounted directly on the shaft 100 (in case the two motors are down).
  • the spring compression detectors 72 will be able to quickly detect an excessive compression threshold and control the interruption of the current in the overloaded motor or in the two motors.
  • the detectors can be simple limit switches. They indeed detect the state of compression of the springs either directly (they are then for example strain gauges) or indirectly, for example by detection of the position of the plate 50 in its housing 54.
  • Another safety problem resolved here is the risk caused by the mismatch between the position of the jack-up platform and the facade of the building at the places where a passage must be provided between the platform and the building.
  • the platform which is normally surrounded by protective barriers against falling people or objects, then has a passage opening facing the building.
  • the building is also provided with a protective barrier which can be opened at the access point, in the same way as a modern elevator door: the door is integral with the building in which one accesses, even if there is also a door in the mobile part of the lift.
  • a problem which results from this arrangement in the case of self-elevating platforms is the fact that the flexibility of the hoist mast (s) can make appear an interval between the facade of the building and the platform; this interval can be several tens of centimeters; it is dangerous, in particular by the risk of falling objects that it can cause.
  • a fixed door unit placed at the location of the access opening in the building, be mounted integral with the mast or masts, and not integral with the building.
  • This structure is particularly advantageous in the case of constructions with two masts, the door unit being fixed on a cross member secured to the two masts. Since the platform is integral with the masts, and the fixed door unit is also integral with the masts, there is no significant risk of play between the two.
  • Figure 8 and Figure 9 show, respectively in side view and in top view, the corresponding construction.
  • the masts are designated by the references 12 and 14, the platform by 10, the facade by 110 and the access window by 112; the structure of the fixed door unit, designated by 113, comprises a frame 114 integral with the two masts and therefore extending horizontally between them, and a horizontal plate 116.
  • This plate extends from the platform 10 (when it is at the correct height) to the interior of the building through the window 112.
  • the clearance between the platform 10 and the plate 116 can be very reduced (a few centimeters at most).
  • the tray 116 is surrounded by protective barriers 118, and passage doors 120 are provided on the door block; doors 122 are in principle also provided on the platform 10.
  • This arrangement is particularly advantageous for structures with two masts where there is space to place a door between the masts and the facade (in the interval between the masts)
  • a door block is proposed at the very bottom (for access to the platform at ground level), this door block being fixed to the mast and being movable in height along this mast.
  • the door unit is mounted in the same way as the platform on a carriage driven by a motor cooperating with the rack of the mast.
  • the assembly can be the same as described previously; however, it is simpler to provide a direct drive (without transmission springs) between the engine and the rack.
  • Figures 10 and 11 show this construction, applied to a lifting platform structure with a single mast to simplify the representation.
  • the door block 120 placed at the bottom of the mast is integral with the mast; it comprises lateral protective barriers 122, an access door 124, a lower plate 126, and possibly an external access ramp 128 protruding outside the barriers 122.
  • the lower door unit can include a drive motor 130 (but it is also possible to use manual lifting means such as a crank and a sufficiently multiplied gear system).
  • the motor or the gear system cooperates with the rack 28 to ensure the positioning of the entire block at a desired height.
  • the structure can be easily transported over a short distance without dismantling it (for example a movement along a building facade).
  • Rolling carriages are placed under the platform, for example one at each end, and the platform is lowered along the masts until it rests on the carriages. At the end of the descent, the platform rests on the rolling carts.
  • the lifting motors of the platform are then actuated, in a direction tending to lower it along the masts.
  • the masts rise slightly.
  • the carriages can then be rolled without having to dismantle the masts.
  • one of the important advantages of the invention is the possibility of working suspended on a facade, or as on the side of a ship for example ( Figure 14).
  • the masts are mounted, but with only one anchor point at the top of the mast.
  • This is possible with a twin-mast structure, whereas this would not be possible, given the torsional forces, with a single-mast structure.
  • platforms of great length because they are more resistant because they do not have a greatly reduced width at the location of the masts, unlike the usual platforms which are indented for the passage in front of the anchors. This possibility is not reserved for flared facades.
  • FIG. 12 shows the use of such a structure with attachment only at the top of the masts.
  • the single anchor point of the mast 12 on the facade 110 is designated by the reference 140 in FIG. 12. It can be seen in FIG. 13 that the platform 10 has only two openings with closed outline for the passage of the masts 12 and 14, but no notches (openings with open outline) for the passage of the platform at the level of anchoring points.
  • the airlock door comprises a door bottom 141 and a roof 142 which are two long plates opening by tilting around horizontal axes. Once tilted, they release the opening of leaves 143 and 144 of the cabin door. These leaves 143 and 144 are preferably of the deployable type like the wings of a fabric fan. When the leaves are folded over each other, the airlock door is extended: these leaves prevent operators from tipping sideways into the void. When folded, the platform is closed. Plate 141 is approximately 50 cm wide.

Abstract

A self-raising platform for building, renovating or maintaining the faade of a building. The platform essentially consists of a two-pole structure (12 & 14) supporting a platform (10). Each pole supports a rack and the platform comprises two motors each co-operating with one of the poles. Safety devices are provided, in particular to prevent the platform from tipping over should one of the hoisting motors break down, and particularly comprise a motor synchronizing shaft and sensors for sensing when one of the motors is under excessive strain and cutting off the power supply to both motors when one motor is unable to keep the platform horizontal.

Description

L'invention concerne les plateformes ou cabines auto-élévatrices utilisées pour la construction, la rénovation et l'entretien extérieur de bâtiments de hauteur importante (plusieurs dizaines de mètres de hauteur typiquement). Par plateforme on entend ici aussi les machines d'élévation, en particulier modulables, ce qui englobe aussi les ascenseurs de personnes.The invention relates to self-elevating platforms or cabins used for the construction, renovation and exterior maintenance of buildings of significant height (typically several tens of meters in height). The term platform here also means elevation machines, in particular modular machines, which also includes passenger elevators.

Par bâtiment, on entend ici des constructions d'habitation ou administratives ou industrielles, etc., mais aussi, par extension, d'autres structures dans lesquelles des plateformes auto-élévatrices peuvent être nécessaires, par exemple des navires en cale sèche pour construction, entretien ou réparation.By building is meant here residential or administrative or industrial constructions, etc., but also, by extension, other structures in which self-elevating platforms may be necessary, for example ships in dry dock for construction, maintenance or repair.

L'invention a pour but de proposer des perfectionnements aux structures de plateformes auto-élévatrices existantes, pour y apporter des améliorations notamment sur le plan de la sécurité, de la solidité, et de la commodité d'emploi.The object of the invention is to propose improvements to the structures of existing jack-up platforms, in order to bring there improvements in particular in terms of safety, solidity, and ease of use.

on comprendra bien entendu que la sécurité est un facteur extrêmement important, les chantiers de construction de bâtiments élevés étant malheureusement très souvent encore le théâtre d'accidents du travail graves.it will of course be understood that safety is an extremely important factor, construction sites for tall buildings being unfortunately very often still the scene of serious industrial accidents.

Les accidents liés aux machines auto-élévatrices peuvent être dus soit à des défauts de construction de celles-ci, soit à une utilisation mal commode qui les rend dangereuses.Accidents related to jack-up machines can be due either to faults in their construction, or to improper use which makes them dangerous.

C'est la raison pour laquelle l'invention propose des perfectionnements visant à limiter les risques au maximum sur ces deux plans.This is the reason why the invention proposes improvements aimed at limiting the risks to the maximum on these two planes.

Selon l'objet de l'invention, on propose une structure de plate-forme auto-élévatrice qui comporte deux mâts verticaux écartés l'un de l'autre, pourvus chacun d'une crémaillère, avec un chariot mobile monté sur chaque mât et coulissant le long de ce mât, chaque chariot portant un moteur respectif coopérant avec la crémaillère, et une plate-forme solidaire des deux chariots, monté sur chaque chariot, est prévu un pignon denté auxiliaire qui coopère avec la crémaillère et qui est entraîné en rotation lorsque le chariot se déplace, un arbre de transmission s'étendant entre les deux mâts et qui relie les pignons dentés auxiliaires des deux chariots de sorte qu'ils tournent en synchronisme, caractérisé en ce que chaque chariot comprend un logement pour une plaque mobile verticale qui porte le moteur et qui peut se déplacer verticalement dans ce logement, avec des ressorts entre la plaque et le logement pour permettre une transmission amortie de l'effort exercé par la plaque sur le chariot sous l'action du moteur coopérant avec la crémaillère, et en ce qu'au moins un détecteur est prévu dans chaque chariot pour détecter la compression des ressorts de transmission, ce détecteur étant raccordé à une commande des deux moteurs pour couper l'alimentation des deux moteurs en cas de compression trop importante d'au moins un ressort.
Cette structure, qui sera explicitée plus en détail dans la suite, est destinée à éviter qu'une panne d'un moteur n'entraîne un basculement de la plateforme (entraînée sur un mât mais pas sur l'autre).
According to the subject of the invention, a self-lifting platform structure which comprises two vertical masts spaced from each other, each provided with a rack, with a movable carriage mounted on each mast and sliding along this mast, each carriage carrying a motor respective cooperating with the rack, and a platform integral with the two carriages, mounted on each carriage, is provided an auxiliary toothed pinion which cooperates with the rack and which is rotated when the carriage moves, a transmission shaft extending between the two masts and which connects the auxiliary toothed pinions of the two carriages so that they rotate in synchronism, characterized in that each carriage includes a housing for a vertical movable plate which carries the motor and which can move vertically in this housing, with springs between the plate and the housing to allow a damped transmission of the force exerted by the plate on the carriage under the action of the motor cooperating with the rack, and in that at least one detector is provided in each carriage for detecting the compression of the transmission springs, this detector being connected to a control of the two motors to cut the supply of the two motors in the event of excessive compression of at least one spring.
This structure, which will be explained in more detail below, is intended to prevent an engine failure from causing the platform to tip over. (driven on one mast but not on the other).

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit et qui est faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente une vue générale d'une plateforme auto-élévatrice bi-mât placée devant un bâtiment;
  • la figure 2 représente la coopération d'un pignon et d'une crémaillère pour l'entraînement de la plateforme le long des mâts de hissage;
  • la figure 3 représente une vue de dessus d'un chariot solidaire de la plateforme, ce chariot portant un moteur d'entraînement;
  • la figure 4 représente un entraînement avec double pignon denté sur la crémaillère;
  • la figure 5 représente le montage flottant de la plaque d'entraînement du chariot, avec les ressorts d'amortissement;
  • la figure 6 représente le pignon auxiliaire servant au couplage mutuel des moteurs des deux mâts;
  • la figure 7 représente l'arbre de synchronisation des deux moteurs;
  • la figure 8 et la figure 9 représentent, en vue latérale et en vue de dessus, un bloc de porte monté fixe par rapport au mât au lieu d'être monté fixe par rapport au bâtiment;
  • la figure 10 et la figure 11 représentent, en vue latérale et en vue de dessus, un bloc de porte de bas de mât, monté fixe par rapport au mât mais déplaçable en hauteur le long des mâts;
  • les figures 12, 13 et 14 représentent, en vue latérale, en vue de dessus et en coupe, la plateforme auto-élévatrice dans le cas d'une fixation unique au sommet des mâts;
  • la figure 15 montre un perfectionnement de l'invention avec lequel on limite les dangers pour les personnes travaillant en hauteur;
  • les figures 16 et 17 montrent un perfectionnement d'un frein de descente de la plateforme.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows and which is given with reference to the appended drawings in which:
  • FIG. 1 represents a general view of a twin mast self-elevating platform placed in front of a building;
  • Figure 2 shows the cooperation of a pinion and a rack for driving the platform along the hoisting masts;
  • Figure 3 shows a top view of a carriage integral with the platform, this carriage carrying a drive motor;
  • FIG. 4 represents a drive with a double toothed pinion on the rack;
  • Figure 5 shows the floating mounting of the carriage drive plate, with the damping springs;
  • FIG. 6 represents the auxiliary pinion used for the mutual coupling of the motors of the two masts;
  • FIG. 7 represents the synchronization shaft of the two motors;
  • Figure 8 and Figure 9 show, in side view and in top view, a door unit mounted fixed relative to the mast instead of being mounted fixed relative to the building;
  • Figure 10 and Figure 11 show, in side view and in top view, a lower mast door block, mounted fixed relative to the mast but movable in height along the masts;
  • Figures 12, 13 and 14 show, in side view, in top view and in section, the self-elevating platform in the case of a single attachment to the top of the masts;
  • FIG. 15 shows an improvement of the invention with which the dangers for people working at height are limited;
  • Figures 16 and 17 show an improvement of a lowering brake of the platform.

Sur la figure 1, pour faire comprendre le contexte de l'invention, on a représenté une vue générale d'une structure de hissage de plateforme auto-élévatrice à deux mâts, placée le long de la façade d'un immeuble en construction ou en rénovation. Cette structure permet de faire monter une plateforme de travail le long de cette façade à une hauteur quelconque désirée, au fur et à mesure des besoins.In Figure 1, to understand the context of the invention, there is shown a general view of a lifting structure of a self-elevating platform with two masts, placed along the facade of a building under construction or in renovation. This structure makes it possible to mount a work platform along this facade at any desired height, as and when required.

La plateforme de travail est désignée par la référence 10. Elle s'étend entre deux mâts 12 et 14 et même en partie en porte-à-faux au delà des mâts. La plateforme est bien entendue munie de toutes les barrières de sécurité nécessaires pour la protection des personnes qui travaillent sur la plateforme et de celles qui sont au dessous (protection contre les chutes d'objets).The working platform is designated by the reference 10. It extends between two masts 12 and 14 and even partly cantilevered beyond the masts. The platform is of course fitted with all the safety barriers necessary to protect the people working on the platform and those below it (protection against falling objects).

Les mâts s'appuient à leur base sur le sol, en principe par l'intermédiaire de supports, 16 et 18 respectivement, en forme de plateaux maintenus horizontaux par des vérins réglables 20 reposant sur le sol.The masts are supported at their base on the ground, in principle by means of supports, 16 and 18 respectively, in the form of plates kept horizontal by adjustable jacks 20 resting on the ground.

Les mâts sont fixés de place en place (par exemple tous les 5 mètres) à la façade du bâtiment, par des ancrages 22 suffisamment forts pour résister aux efforts de traction et torsion exercés sur les mâts par le poids et les mouvements de la plateforme 10.The masts are fixed from place to place (for example every 5 meters) to the facade of the building, by anchors 22 strong enough to withstand the tensile and torsional forces exerted on the masts by the weight and the movements of the platform 10.

Le déplacement de la plateforme est assuré par des moteurs électriques portés par la plateforme elle-même, moteurs qui coopèrent avec des crémaillère portées par les mâts.The movement of the platform is ensured by electric motors carried by the platform itself, motors which cooperate with rack and pinion carried by the masts.

C'est pourquoi on voit sur la figure 1 au dessous de la plateforme et contre chacun des mâts des blocs d'entraînement 24 et 26 qui constituent des chariots élévateurs solidaires de la plateforme et entraînant celle-ci dans leurs déplacements le long du mât.This is why we see in Figure 1 below the platform and against each of the masts of the drive blocks 24 and 26 which constitute forklifts integral with the platform and driving the latter in their movements along the mast.

Une crémaillère 28 est visible sur le mât de droite 14. Celle du mât 12 n'est pas représentée sur la figure 1.A rack 28 is visible on the right mast 14. That of the mast 12 is not shown in FIG. 1.

Chaque chariot porte au moins un moteur électrique couplé à un réducteur, avec au moins un pignon denté coopérant avec la crémaillère correspondante pour assurer, lors de la rotation du moteur, un déplacement du chariot.Each carriage carries at least one electric motor coupled to a reduction gear, with at least one toothed pinion cooperating with the corresponding rack to ensure, during the rotation of the motor, movement of the carriage.

Les moteurs sont reliés par des câbles d'alimentation électrique 30 à une source d'alimentation 32. La commande des moteurs est de préférence située sur la plateforme, de manière que les occupants puissent la manoeuvrer eux-mêmes; mais on peut prévoir aussi une commande par en bas ou une double commande, à la fois par en bas et par les occupants.The motors are connected by electric power cables 30 to a power source 32. The motor control is preferably located on the platform, so that the occupants can maneuver it themselves; but it is also possible to provide a command from below or a double command, both from below and by the occupants.

On comprendra que les deux moteurs doivent fonctionner simultanément, sous peine de voir la plateforme s'incliner et exercer des forces d'arrachage considérables sur les mâts et les ancrages, aboutissant à la destruction de la structure et à des accidents mortels.It will be understood that the two motors must operate simultaneously, otherwise the platform will tilt and exert considerable lifting forces on the masts and anchors, leading to the destruction of the structure and to fatal accidents.

On va décrire ci-après les dispositions qui sont adoptées pour éviter ces risques.We will describe below the provisions that are adopted to avoid these risks.

Tout d'abord, la figure 2 représente la coopération d'un moteur et de la crémaillère. Le pignon denté de sortie du réducteur, désigné par la référence 40, possède des dents 42 qui s'engrènent dans les dents 44 de la crémaillère 28; les dents 44 de la crémaillère sont usinées dans une première face d'une barre métallique qui est soudée ou boulonnée tout le long du mât de hissage. Un galet de pressage 48 vient s'appuyer contre une face opposée 46 de cette barre pour maintenir les dents du pignon 40 imbriquées dans les dents de la crémaillère.First, Figure 2 shows cooperation of an engine and rack. The gear pinion output from the reducer, designated by the reference 40, has teeth 42 which mesh with the teeth 44 of the rack 28; the teeth 44 of the rack are machined in a first face of a metal bar which is welded or bolted all along the hoist mast. A pressing roller 48 comes to bear against an opposite face 46 of this bar to keep the teeth of the pinion 40 nested in the teeth of the rack.

Pour cela, le galet 48 et le pignon 40 sont montés tous les deux en rotation sur une plaque métallique commune 50. Le moteur et le réducteur (non visibles car placés derrière la plaque) sont fixés sur la plaque 50. Il n'y a pas de jeu ou pratiquement pas de jeu entre le galet 48 et le pignon 40 pour qu'il n'y ait pas de risque de désengagement de l'engrenage.For this, the roller 48 and the pinion 40 are both rotatably mounted on a common metal plate 50. The motor and the reduction gear (not visible because placed behind the plate) are fixed on the plate 50. There is no no play or practically no play between the roller 48 and the pinion 40 so that there is no risk of disengagement of the gear.

La plaque 50 sera donc l'organe principal d'entraînement de la plateforme sur le mât de hissage. La disposition est identique sur les deux mâts.The plate 50 will therefore be the main drive member of the platform on the hoist mast. The arrangement is identical on the two masts.

Cependant, cette plaque 50 n'est pas directement solidaire du chariot (ou bloc d'entraînement) 24 ou 26 de la figure 1. La structure qui permet d'entraîner le chariot 26 à partir de la plaque 50 est représentée à la figure 3. Contrairement à la figure 2 qui est une vue horizontale, la vue de la figure 3 est une vue de dessus.However, this plate 50 is not directly integral with the carriage (or drive unit) 24 or 26 of FIG. 1. The structure which makes it possible to drive the carriage 26 from the plate 50 is shown in FIG. 3 Unlike Figure 2 which is a horizontal view, the view of Figure 3 is a top view.

Le chariot 26, qui est solidaire de la plateforme 10, comporte par exemple des plaques métalliques 52 ou un profilé constituant son ossature principale. La plateforme est solidarisée par n'importe quel moyen classique (soudure, boulons, rivets, etc.) à cette ossature.The carriage 26, which is integral with the platform 10, comprises for example metal plates 52 or a profile constituting its main framework. The platform is secured by any conventional means (welding, bolts, rivets, etc.) to this frame.

La crémaillère 28 est soudée ou boulonnée au mât 14 dont on voit aussi l'ossature sur la figure 3.The rack 28 is welded or bolted to the mast 14 whose framework is also seen in Figure 3.

Dans le chariot 26 on a ménagé un logement 54 pour la plaque d'entraînement 50, logement dans lequel celle-i peut coulisser verticalement sur une certaine distance (quelques centimètres ou dizaines de centimètres au maximum) et horizontalement (de l'ordre du centimètre). Le logement 54 est défini par exemple par des plaques ou profilés métalliques 56 soudés ou boulonnés sur l'ossature 52 du chariot.In the carriage 26, a housing 54 has been provided for the drive plate 50, housing in which the latter can slide vertically over a certain distance (a few centimeters or tens of centimeters at most) and horizontally (of the order of a centimeter ). The housing 54 is defined for example by metal plates or profiles 56 welded or bolted to the frame 52 of the carriage.

Horizontalement, il n'y a pas ou presque pas de jeu de la plaque 50 dans son logement dans la direction perpendiculaire à la plaque mais il y a un jeu (2 cm par exemple) parallèlement à la plaque, comme cela est représenté.Horizontally, there is no or almost no clearance of the plate 50 in its housing in the direction perpendicular to the plate but there is a clearance (2 cm for example) parallel to the plate, as shown.

Sur la figure 3, on voit un moto-réducteur 58 fixé rigidement à la plaque 50, l'axe du moto-réducteur traversant la plaque pour entraîner le pignon 40 placé de l'autre côté de celle-ci en regard de la crémaillère.In Figure 3, we see a geared motor 58 rigidly fixed to the plate 50, the axis of the geared motor passing through the plate to drive the pinion 40 placed on the other side thereof opposite the rack.

Le galet presseur 48 est également fixé rigidement à la plaque à une position telle qu'il vienne s'appuyer contre la face non dentée de la crémaillère. Ce galet tourne librement autour d'un axe qui traverse la plaque.The pressure roller 48 is also rigidly fixed to the plate in a position such that it comes to bear against the non-toothed face of the rack. This roller turns freely around an axis which crosses the plate.

Il faut noter que d'autres moyens pourraient être prévus pour maintenir le pignon 40 engrené sur la crémaillère, par exemple des moyens qui prennent appui non pas sur la face arrière de la crémaillère mais sur d'autres parties du mât. Le galet tournant fixé à la plaque est cependant le moyen préféré. Par ailleurs, l'échappement latéral du pignon 40 hors de la crémaillère est empêché par un profilé (non représenté) solidaire du chariot 26 et prenant appui en réaction et en coulissement le long du mât (14).It should be noted that other means could be provided to keep the pinion 40 meshed on the rack, for example means which bear not on the rear face of the rack but on other parts of the mast. The rotating roller fixed to the plate is however the preferred means. Furthermore, the lateral escape of the pinion 40 from the rack is prevented by a profile (not shown) integral with the carriage 26 and bearing in reaction and sliding along the mast (14).

Bien qu'on ait représenté un seul pignon 40 d'entraînement couplé à la crémaillère, on comprendra qu'on peut aussi prévoir une structure à deux pignons, telle que représentée à la figure 4 : le moteur entraîne un premier pignon denté 41 qui n'est pas couplé à la crémaillère, ce premier pignon entraînant deux pignons satellites identiques 43 et 45 tournant dans le même sens; ces derniers sont couplés à la crémaillère et deux galets presseurs 47 et 49 sont placés de l'autre côté de la crémaillère, en face des pignons 43 et 45 respectivement. La transmission de l'effort est mieux répartie. On supprime l'effort radial exercé sur le moto-réducteur. L'invention, avec plaque flottante et double pignon satellite, a pour but de répartir également l'effort sur les deux pignons. En effet, en cas de montage rigide, (sans plaque flottante), les couples générés au niveau des chariots de guidage sont beaucoup plus importants que ceux générés par le recul ou l'avancée des dents s'engrenant dans la crémaillère. Aussi l'effort transmis entre un pignon satellite et la crémaillère varie de zéro à 100 % suivant que ce pignon est plus enfoui que l'autre ou qu'à la jonction de deux crémaillères, le pas se modifie. Dans ce cas un des pignons travaille plus que l'autre.Although a single drive pinion 40 has been shown coupled to the rack, it will be understood that a two-pinion structure can also be provided, as shown in FIG. 4: the motor drives a first toothed pinion 41 which is not coupled to the rack, this first pinion driving two identical satellite pinions 43 and 45 rotating in the same way; the latter are coupled to the rack and two pressure rollers 47 and 49 are placed on the other side of the rack, opposite the pinions 43 and 45 respectively. The transmission of effort is better distributed. The radial force exerted on the gear motor is eliminated. The invention, with floating plate and double satellite pinion, aims to distribute the force equally on the two pinions. Indeed, in the case of rigid mounting, (without floating plate), the torques generated at the level of the guide carriages are much greater than those generated by the recoil or the advancement of the teeth meshing in the rack. Also the force transmitted between a satellite pinion and the rack varies from zero to 100% depending on whether this pinion is more buried than the other or at the junction of two racks, the pitch changes. In this case one of the pinions works more than the other.

Avec la plaque flottante, les pignons se règlent automatiquement en entrant ou sortant plus ou moins de la crémaillère, comme les boogies répartissent l'effort également (50 %-50 %) sur deux galets ou roues.With the floating plate, the pinions are automatically adjusted by entering or leaving more or less the rack, as the boogies distribute the effort equally (50% -50%) on two rollers or wheels.

La figure 5 représente une vue horizontale, perpendiculaire à la plaque 50, montrant la plaque dans son logement 54, et montrant surtout la liaison par ressorts entre la plaque et ce logement.FIG. 5 represents a horizontal view, perpendicular to the plate 50, showing the plate in its housing 54, and especially showing the connection by springs between the plate and this housing.

A la partie supérieure de la plaque 50, des parois horizontales 60 ferment la partie supérieure du logement 54; des ressorts, par exemple deux ressorts 62 et 64, sont placés entre la plaque 50 et ces parois horizontales supérieures. La plaque ne peut exercer une action sur les parois 60 et plus généralement sur le chariot 26 ou la plateforme 10 que par l'intermédiaire de ces ressorts de transmission de mouvement. La transmission est donc amortie et il n'y a pas de choc lors du démarrage des moteurs. Les ressorts peuvent être remplacés par des silent-blocs ou même des amortisseurs à gaz.At the upper part of the plate 50, horizontal walls 60 close the upper part of the housing 54; springs, for example two springs 62 and 64, are placed between the plate 50 and these walls upper horizontal. The plate can exert an action on the walls 60 and more generally on the carriage 26 or the platform 10 only by means of these movement transmission springs. The transmission is therefore damped and there is no shock when the engines are started. The springs can be replaced by silent blocks or even gas shock absorbers.

De même, à sa partie inférieure, la plaque est séparée des parois horizontales inférieures 66 du logement 54 par l'intermédiaire de ressorts 68 et 70.Likewise, at its lower part, the plate is separated from the lower horizontal walls 66 of the housing 54 by means of springs 68 and 70.

La plaque peut coulisser verticalement dans son logement, mais elle doit alors exercer une force de compression sur les ressorts. L'état de compression des ressorts peut être mesuré soit par des détecteurs de déformation, tels que des jauges de contrainte, soit par des détecteurs de déplacement de la plaque par rapport au logement. De tels détecteurs sont prévus, et sont désignés par la référence 72. Ils servent selon l'invention à assurer une sécurité. Ils peuvent être de simple détecteurs dits fin de course mais sont de préférence des jauges de contrainte.The plate can slide vertically in its housing, but it must then exert a compressive force on the springs. The state of compression of the springs can be measured either by deformation detectors, such as strain gauges, or by detectors of displacement of the plate relative to the housing. Such detectors are provided, and are designated by the reference 72. They serve according to the invention to provide security. They can be simple so-called limit switches, but are preferably strain gauges.

Avec des machines bi-mâts, soit à moteurs indépendants non reliés par un ordre de synchronisation, soit à moteurs centraux, le mouvement est distribué symétriquement. Mais dans le premier cas, il n'est pas possible de garantir une synchronisation mécanique entre les deux éléments moteurs (la synchronisation n'offrant aucune garantie en cas de défaillance de cette dernière ou en cas d'intervention de descente manuelle avec absence d'électricité).With twin mast machines, either with independent motors not linked by a synchronization order, or with central motors, the movement is distributed symmetrically. But in the first case, it is not possible to guarantee mechanical synchronization between the two motor elements (synchronization does not offer any guarantee in the event of failure of the latter or in the event of manual descent intervention with no electricity).

Dans le deuxième cas, il n'est pas possible de détecter une surcharge, un déséquilibre de charge ou une avarie sur un organe de transmission.In the second case, it is not possible to detect an overload, load imbalance or damage to a transmission member.

L'invention permet de remédier à tous les risques d'avarie connus.The invention makes it possible to remedy all known risks of damage.

On a encore représenté sur la figure 4 des patins latéraux 74 limitant le jeu horizontal parallèle à la plaque et réalisés en un matériau facilitant le glissement de la plaque sans frottement.Also shown in Figure 4 side shoes 74 limiting the horizontal clearance parallel to the plate and made of a material facilitating the sliding of the plate without friction.

Lorsque le moteur 58 tourne et entraîne le pignon denté 40, la plaque monte le long de la crémaillère. Les ressorts supérieurs 62 et 64 se compriment proportionnellement à la résistance opposée par le poids de la plateforme 10; quand l'équilibre est atteint entre cette résistance et la force de compression du ressort, le chariot 26 est entraîné en hauteur ainsi que l'ensemble de la plateforme (les moteurs des deux chariots 24 et 26 étant bien entendu actionnés simultanément). Les détecteurs 72 peuvent servir justement à détecter une compression exagérée des ressorts, signe d'une résistance exagérée opposée par la plateforme au mouvement qu'on cherche à lui imprimer.When the motor 58 rotates and drives the toothed pinion 40, the plate rises along the rack. The upper springs 62 and 64 compress proportionally to the resistance opposed by the weight of the platform 10; when the balance is reached between this resistance and the compression force of the spring, the carriage 26 is driven in height as well as the whole of the platform (the motors of the two carriages 24 and 26 being of course actuated simultaneously). The detectors 72 can precisely serve to detect an exaggerated compression of the springs, sign of an exaggerated resistance opposed by the platform to the movement that one seeks to impart to it.

Les ressorts permettent en tout cas d'effectuer des démarrages et des arrêts sans à-coups : ils amortissent les accélérations du moteur.The springs allow in any case to start and stop smoothly: they dampen the acceleration of the engine.

En cas de panne du moteur de l'un des mâts, la plateforme continue à monter d'un seul côté, l'autre étant arrêté ou même tendant à descendre. L'effort exercé du côté qui monte va être beaucoup plus important; le détecteur 72 peut servir à interrompre d'urgence l'alimentation du moteur qui continue à tourner.In the event of a motor failure on one of the masts, the platform continues to rise on one side only, the other being stopped or even tending to descend. The effort exerted on the rising side will be much greater; the detector 72 can be used to urgently interrupt the supply of the engine which continues to run.

Toutefois, cela n'est pas suffisant. C'est pourquoi on prévoit un couplage mécanique direct entre les systèmes d'entraînement des deux mâts, associé à une détection d'une compression excessive des ressorts d'amortissement. Par le couplage direct on s'assure qu'en cas de panne d'un moteur les deux chariots continuent à être entraînés par le moteur qui n'est pas en panne; il n'y a donc pas de déséquilibre de la plateforme; elle reste sensiblement horizontale et n'exerce pas d'efforts d'arrachage sur les mâts; mais alors, le moteur qui continue à travailler devient en surcharge. Les ressorts 62 et 64 tendent à se comprimer davantage; les détecteurs 72 détectent la déformation ou le raccourcissement de longueur des ressorts, et déclenchent l'arrêt du moteur en cas de dépassement d'un seuil. Ce qui veut dire que dès qu'un moteur est en surcharge (surcharge ou mauvaise répartition de la charge, ou avarie dans un ensemble moto-réducteur), les deux moteurs sont alors arrêtés, ce qui est beaucoup moins dangereux qu'un seul moteur inefficient sans qu'on s'en aperçoive.However, this is not enough. This is why a direct mechanical coupling is provided between the drive systems of the two masts, associated with a detection of excessive compression of the damping springs. By direct coupling we ensure that in the event of an engine failure the two carriages continue to be driven by the engine which is not broken down; there is therefore no imbalance of the platform; it remains substantially horizontal and exerts no lifting forces on the masts; but then the motor which continues to work becomes overloaded. The springs 62 and 64 tend to compress more; the detectors 72 detect the deformation or shortening of the length of the springs, and trigger the engine to stop if a threshold is exceeded. This means that as soon as an engine is overloaded (overload or poor distribution of the load, or damage in a geared motor unit), the two motors are then stopped, which is much less dangerous than a single motor inefficient without anyone noticing.

Ainsi, en cas de surcharge, la plateforme ne peut démarrer. Il faut soit décharger une partie, soit mieux répartir la charge pour pouvoir démarrer. Il est à noter qu'un avertisseur sonore et/ou lumineux peut être prévu pour avertir d'une surcharge, même en statique.Thus, in the event of an overload, the platform cannot start. You have to either unload a part, or better distribute the load to be able to start. It should be noted that an audible and / or luminous alarm can be provided to warn of an overload, even when static.

En cas d'avarie d'un ensemble moto-réducteur, chaque moto-réducteur étant calculé pour tenir la charge totale, et l'arbre de synchronisation étant calculé pour transmettre aussi toute la charge, la plateforme est arrêtée instantanément et seule une descente manuelle est possible pour redescendre et remédier à l'avarie en sécurité.In the event of damage to a geared motor assembly, each geared motor being calculated to hold the total load, and the synchronization shaft being calculated to also transmit all the load, the platform is stopped instantly and only a manual descent is possible to descend and remedy the damage safely.

En général on prévoit que les moteurs sont munis de freins centrifuges qui limitent la vitesse de descente de la plateforme à une valeur acceptable. On peut aussi prévoir des systèmes de blocage automatique libérés en cas d'interruption de courant, par exemple des taquets coinceurs, des cames autobloquantes, des patins de frein solidaires du chariot et appliqués fortement contre la crémaillère pour freiner la descente.In general, the motors are provided with centrifugal brakes which limit the descent speed of the platform to an acceptable value. It is also possible to provide automatic blocking systems released in the event of a power outage, for example cam cleats, self-locking cams, brake pads. integral with the carriage and applied strongly against the rack to slow down the descent.

L'invention est particulièrement intéressante en combinaison avec des freins à courant de foucault (comportant un disque métallique, en cuivre généralement, tournant dans l'entrefer d'un aimant). Ces freins peuvent être montés soit sur le pignon du moteur soit sur l'arbre de synchronisation lui-même.The invention is particularly advantageous in combination with eddy current brakes (comprising a metal disc, generally of copper, rotating in the air gap of a magnet). These brakes can be mounted either on the motor pinion or on the synchronization shaft itself.

Les figures 16 et 17 montrent un tel dispositif où un moteur 58 possède en bout d'arbre un disque métallique 145 tournant dans l'entrefer d'un aimant 146. Lorsque le moteur doit démarrer, un vérin électrique 147 éloigne l'aimant permanent du disque de cuivre et alors, après contrôle par un contact de position, le moteur démarre. En cas d'interruption d'alimentation électrique, l'aimant permanent se remet en place par la poussée d'un ressort 148. La descente est régulée par les forces électromotrices générées dans le disque cuivre solidaire de l'arbre moteur. Cette technique permet d'effectuer facilement périodiquement les tests de fonctionnement du frein parachute. En effet, avec les techniques anciennes à masselottes déplaçables irréversiblement, après un essai, il faut démonter tout le frein pour le remettre en attente (au risque de mal le remonter).Figures 16 and 17 show such a device where a motor 58 has at the end of the shaft a metal disc 145 rotating in the air gap of a magnet 146. When the motor is to start, an electric actuator 147 moves the permanent magnet away from the copper disc and then, after checking by a position contact, the motor starts. In the event of an interruption in the power supply, the permanent magnet is replaced by the push of a spring 148. The descent is regulated by the electromotive forces generated in the copper disc secured to the motor shaft. This technique makes it easy to periodically perform functional tests of the parachute brake. Indeed, with the old techniques with irreversibly movable weights, after a test, you have to disassemble the whole brake to put it back on hold (at the risk of badly reassembling it).

Pour obtenir un couplage mécanique des systèmes d'entraînement des deux mâts, on procède de préférence de la manière expliquée ci-après en référence aux figures 6 et 7.To obtain a mechanical coupling of the drive systems of the two masts, the procedure is preferably as explained below with reference to FIGS. 6 and 7.

Sur chaque mât, on prévoit qu'un pignon auxiliaire, porté par le chariot, coopérant avec la crémaillère. Mais en régime de fonctionnement normal, ce pignon n'entraîne pas le chariot. Il est au contraire entraîné en rotation par le déplacement du chariot. En montant, le chariot se déplace par rapport à la crémaillère, et ce déplacement fait donc tourner le pignon auxiliaire.On each mast, an auxiliary pinion is provided, carried by the carriage, cooperating with the rack. But under normal operating conditions, this pinion does not drive the carriage. On the contrary, it is rotated by the movement of the carriage. Climbing, the carriage moves relative to the rack, and this movement therefore rotates the auxiliary pinion.

Sur la figure 6, on voit la plaque 50, le pignon moteur 40 qui fait monter la plaque, et le galet presseur 48, le tout couplé à l'ossature 52 du chariot par des ressorts. Et on voit également le pignon auxiliaire 80 engrené sur la crémaillère 28, avec également un galet presseur analogue au galet 48.In Figure 6, we see the plate 50, the pinion 40 which causes the plate to rise, and the pressure roller 48, all coupled to the frame 52 of the carriage by springs. And we also see the auxiliary pinion 80 meshed on the rack 28, also with a pressure roller similar to the roller 48.

Dans l'exemple représenté, le pignon auxiliaire 80 est monté sur une deuxième plaque 90. Cette plaque 90 est de préférence solidaire du chariot. Mais elle peut être analogue à la plaque 50, coulissant dans un logement 94 analogue au logement 54, ce logement étant solidaire du chariot. des ressorts d'amortissement sont également prévus entre la plaque 90 et le logement 94. Dans ce cas, son état est aussi surveillé par un détecteur 72 bis du même type que le détecteur 72.In the example shown, the auxiliary pinion 80 is mounted on a second plate 90. This plate 90 is preferably secured to the carriage. But it can be similar to the plate 50, sliding in a housing 94 similar to the housing 54, this housing being integral with the carriage. damping springs are also provided between the plate 90 and the housing 94. In this case, its condition is also monitored by a detector 72 bis of the same type as the detector 72.

Mais on peut aussi prévoir que le pignon auxiliaire et son galet sont montés sur la même plaque 50 que le pignon d'entraînement principal si c'est possible du point de vue de l'encombrement. Dans le cas où ils sont montés sur des plaques différentes, la plaque 90 portant le pignon auxiliaire n'est pas obligatoirement montée de manière flottante (c'est-à-dire par l'intermédiaire de ressorts) comme la plaque 50. Il est d'ailleurs possible alors que le pignon auxiliaire soit directement monté sur le chariot et non sur une plaque mobile.But it can also be provided that the auxiliary pinion and its roller are mounted on the same plate 50 as the main drive pinion if it is possible from the point of view of space. In the case where they are mounted on different plates, the plate 90 carrying the auxiliary pinion is not necessarily mounted in a floating manner (that is to say by means of springs) like the plate 50. It is moreover possible while the auxiliary pinion is directly mounted on the carriage and not on a movable plate.

Au lieu que le pignon auxiliaire 80 soit couplé à un moteur, il est couplé directement à un arbre de transmission qui s'étend entre les deux mâts 12 et 14 et qui est relié de l'autre côté au pignon auxiliaire correspondant. Les deux pignons auxiliaires sont donc directement couplés en rotation.Instead of the auxiliary pinion 80 being coupled to a motor, it is directly coupled to a drive shaft which extends between the two masts 12 and 14 and which is connected on the other side to the corresponding auxiliary pinion. The two auxiliary gears are therefore directly coupled in rotation.

C'est ce que l'on voit sur la figure 7 qui représente de manière simplifiée (pour ne pas alourdir le schéma) uniquement le couplage entre les pignons auxiliaires.This is what we see in Figure 7 which represents in a simplified way (so as not to burden the diagram) only the coupling between the auxiliary pinions.

Les références sont les mêmes qu'aux figures précédentes pour le mât 14. Pour le mât 12 les références sont les mêmes avec l'indice "prime"; ainsi, la crémaillère pour le mât 12 est désignée par 28'. Les chariots 26 et 24 ne sont pas représentés; mais ils sont reliés aux plaques auxiliaires 90 et 90' par des ressorts, comme cela a été expliqué.The references are the same as in the previous figures for the mast 14. For the mast 12 the references are the same with the index "prime"; thus, the rack for the mast 12 is designated by 28 '. The carriages 26 and 24 are not shown; but they are connected to the auxiliary plates 90 and 90 'by springs, as has been explained.

L'arbre de transmission, qu'on peut aussi appeler arbre de synchronisation, est désigné par 100. Il s'étend sur toute la longueur séparant les mâts 12 et 14 sur la figure 1.The transmission shaft, which can also be called synchronization shaft, is designated by 100. It extends over the entire length separating the masts 12 and 14 in FIG. 1.

En régime normal les pignons auxiliaires tournent en synchronisme, entraînés chacun par le déplacement du chariot correspondant, puisque les deux moteurs fonctionnent et tournent à la même vitesse. La plateforme s'élève ou s'abaisse horizontalement.Under normal conditions, the auxiliary pinions rotate in synchronism, each driven by the movement of the corresponding carriage, since the two motors operate and rotate at the same speed. The platform rises or falls horizontally.

En cas de panne des deux moteurs (coupure d'alimentation), le freinage centrifuge joue son rôle de "parachute". Avec l'invention cependant, on peut monter en plus un frein parachute directement sur l'arbre 100 (au cas où les deux moteurs seraient en panne).In the event of a failure of the two motors (power failure), centrifugal braking plays its role of "parachute". With the invention, however, a parachute brake can also be mounted directly on the shaft 100 (in case the two motors are down).

En cas de faiblesse ou de panne d'un seul moteur, ou plus généralement de déséquilibre entre les moteurs, l'un des chariots va tendre à monter plus vite que l'autre; l'arbre de transmission va tendre à rattraper la différence, mais en faisant travailler davantage le moteur du côté qui monte le plus vite.In the event of weakness or failure of a single motor, or more generally of imbalance between the motors, one of the carriages will tend to climb faster than the other; the drive shaft will tend to make up for the difference, but by making the engine work more on the side that goes up faster.

Les détecteurs 72 de compression des ressorts vont pouvoir détecter très rapidement un seuil de compression excessive et commander l'interruption du courant dans le moteur surchargé ou dans les deux moteurs. Les détecteurs peuvent être de simples interrupteurs de fin de course. Ils détectent en effet l'état de compression des ressorts soit directement (ce sont alors par exemple des jauges de contrainte) soit indirectement, par exemple par détection de la position de la plaque 50 dans son logement 54.The spring compression detectors 72 will be able to quickly detect an excessive compression threshold and control the interruption of the current in the overloaded motor or in the two motors. The detectors can be simple limit switches. They indeed detect the state of compression of the springs either directly (they are then for example strain gauges) or indirectly, for example by detection of the position of the plate 50 in its housing 54.

On a ainsi résolu un problème de sécurité grave inhérent aux structures à deux mâts. On peut donc en toute sécurité utiliser ce type de structure qui a l'avantage, par rapport aux structures à un seul mât :

  • d'être beaucoup plus stable
  • de ne pas exercer une torsion sur le mât au cours des déplacements de la plateforme,
  • d'autoriser de plus grandes longueurs de plateforme.
This has solved a serious safety problem inherent in structures with two masts. We can therefore safely use this type of structure which has the advantage, compared to structures with a single mast:
  • to be much more stable
  • not to exert a twist on the mast during movements of the platform,
  • to allow longer platform lengths.

Un autre problème de sécurité résolu ici est le risque engendré par le décalage entre la position de la plateforme auto-élévatrice et la façade du bâtiment aux endroits où un passage doit être assuré entre la plateforme et le bâtiment.Another safety problem resolved here is the risk caused by the mismatch between the position of the jack-up platform and the facade of the building at the places where a passage must be provided between the platform and the building.

C'est le cas lorsqu'on accède à l'intérieur du bâtiment par une fenêtre en hauteur, accessible seulement par la plateforme. La plateforme, qui est normalement entourée de barrières de protection contre les chutes de personnes ou d'objets, possède alors une ouverture de passage tournée vers le bâtiment. En général, le bâtiment est lui aussi pourvu d'une barrière de protection ouvrable à l'endroit d'accès, à la manière d'une porte d'ascenseur moderne : la porte est solidaire du bâtiment dans lequel on accède, même s'il y a en plus une porte dans la partie mobile de l'ascenseur.This is the case when accessing the interior of the building through a high window, accessible only by the platform. The platform, which is normally surrounded by protective barriers against falling people or objects, then has a passage opening facing the building. In general, the building is also provided with a protective barrier which can be opened at the access point, in the same way as a modern elevator door: the door is integral with the building in which one accesses, even if there is also a door in the mobile part of the lift.

Un problème qui résulte de cette disposition dans le cas des plateformes auto-élévatrices est le fait que la flexibilité du ou des mâts de hissage peut faire apparaître un intervalle entre la façade du bâtiment et la plateforme; cet intervalle peut être de plusieurs dizaines de centimètres; il est dangereux, notamment par le risque de chutes d'objets qu'il peut engendrer.A problem which results from this arrangement in the case of self-elevating platforms is the fact that the flexibility of the hoist mast (s) can make appear an interval between the facade of the building and the platform; this interval can be several tens of centimeters; it is dangerous, in particular by the risk of falling objects that it can cause.

On propose selon l'invention qu'un bloc de porte fixe, placé à l'endroit de l'ouverture d'accès dans le bâtiment, soit monté de manière solidaire du ou des mâts, et non pas solidaire du bâtiment.It is proposed according to the invention that a fixed door unit, placed at the location of the access opening in the building, be mounted integral with the mast or masts, and not integral with the building.

Cette structure est particulièrement avantageuse dans le cas de constructions à deux mâts, le bloc de porte étant fixé sur une traverse solidaire des deux mâts. Etant donné que la plateforme est solidaire des mâts, et que le bloc de porte fixe est aussi solidaire des mâts, il n'y a pas de risque de jeu important entre les deux.This structure is particularly advantageous in the case of constructions with two masts, the door unit being fixed on a cross member secured to the two masts. Since the platform is integral with the masts, and the fixed door unit is also integral with the masts, there is no significant risk of play between the two.

La figure 8 et la figure 9 représentent, respectivement en vue latérale et en vue de dessus, la construction correspondante.Figure 8 and Figure 9 show, respectively in side view and in top view, the corresponding construction.

Les mâts sont désignés par les références 12 et 14, la plateforme par 10, la façade par 110 et la fenêtre d'accès par 112; la structure du bloc de porte fixe, désignée par 113, comporte une ossature 114 solidaire des deux mâts et s'étendant donc horizontalement entre eux, et un plateau horizontal 116. Ce plateau s'étend depuis la plateforme 10 (lorsqu'elle est à la bonne hauteur) jusqu'à l'intérieur du bâtiment à travers la fenêtre 112. Le jeu entre la plateforme 10 et le plateau 116 peut être très réduit (quelques centimètres au maximum). Le plateau 116 est entouré de barrières de protection 118, et des portes de passage 120 sont prévus sur le bloc de porte; des portes 122 sont en principe prévues aussi sur la plateforme 10.The masts are designated by the references 12 and 14, the platform by 10, the facade by 110 and the access window by 112; the structure of the fixed door unit, designated by 113, comprises a frame 114 integral with the two masts and therefore extending horizontally between them, and a horizontal plate 116. This plate extends from the platform 10 (when it is at the correct height) to the interior of the building through the window 112. The clearance between the platform 10 and the plate 116 can be very reduced (a few centimeters at most). The tray 116 is surrounded by protective barriers 118, and passage doors 120 are provided on the door block; doors 122 are in principle also provided on the platform 10.

Cette disposition est particulièrement intéressante pour les structures à deux mâts où il y a de la place pour placer une porte entre les mâts et la façade (dans l'intervalle séparant les mâts)This arrangement is particularly advantageous for structures with two masts where there is space to place a door between the masts and the facade (in the interval between the masts)

Selon encore un autre perfectionnement aux structures de plateforme élévatrices, décrit en référence aux figures 10 et 11, on propose un bloc de porte tout en bas (pour l'accès à la plateforme au niveau du sol), ce bloc de porte étant fixé au mât et étant mobile en hauteur le long de ce mât.According to yet another improvement to the lifting platform structures, described with reference to FIGS. 10 and 11, a door block is proposed at the very bottom (for access to the platform at ground level), this door block being fixed to the mast and being movable in height along this mast.

Par exemple, le bloc de porte est monté de la même manière que la plateforme sur un chariot entraîné par un moteur coopérant avec la crémaillère du mât. Le montage peut être le même que décrit précédemment; toutefois il est plus simple de prévoir un entraînement direct (sans ressorts de transmission) entre le moteur et la crémaillère.For example, the door unit is mounted in the same way as the platform on a carriage driven by a motor cooperating with the rack of the mast. The assembly can be the same as described previously; however, it is simpler to provide a direct drive (without transmission springs) between the engine and the rack.

Sur les figures 10 et 11 on a représenté cette construction, appliquée à une structure de plateforme élévatrice à un seul mât pour simplifier la représentation.Figures 10 and 11 show this construction, applied to a lifting platform structure with a single mast to simplify the representation.

Les références sont les mêmes qu'aux figures précédentes : bâtiment 110, plateforme 10, mât 14, crémaillère 28, moteur d'entraînement 58 pour la plateforme 10. La plateforme 10 n'est pas représentée à la figure 11.The references are the same as in the previous figures: building 110, platform 10, mast 14, rack 28, drive motor 58 for the platform 10. The platform 10 is not shown in FIG. 11.

Le bloc de porte 120 placé au bas du mât est solidaire du mât; il comprend des barrières latérales de protection 122, une porte d'accès 124, un plateau inférieur 126, et éventuellement une rampe d'accès extérieure 128 faisant saillie en dehors des barrières 122.The door block 120 placed at the bottom of the mast is integral with the mast; it comprises lateral protective barriers 122, an access door 124, a lower plate 126, and possibly an external access ramp 128 protruding outside the barriers 122.

De plus, le bloc de porte du bas peut comporter un moteur d'entraînement 130 (mais on peut aussi utiliser un moyen manuel de levage tel qu'une manivelle et un système d'engrenages suffisamment démultiplié). Le moteur ou le système d'engrenage coopère avec la crémaillère 28 pour assurer le positionnement de l'ensemble du bloc à une hauteur désirée.In addition, the lower door unit can include a drive motor 130 (but it is also possible to use manual lifting means such as a crank and a sufficiently multiplied gear system). The motor or the gear system cooperates with the rack 28 to ensure the positioning of the entire block at a desired height.

Selon qu'on désire travailler pratiquement au ras du sol ou par exemple à hauteur d'une benne de déchargement d'un camion, on placera le bloc du bas à une hauteur correspondante. Dans ce cas, on enlève la rampe d'accès.Depending on whether you want to work practically at ground level or for example at the height of an unloading skip from a truck, you will place the bottom block at a corresponding height. In this case, the access ramp is removed.

Sur le bloc de porte sont fixés habituellement les contacteurs électriques de fin de course qui sont actionnés par la plateforme lorsqu'elle arrive en position basse et qui déclenchent l'arrêt de celle-ci.On the door unit are usually fixed the electrical limit switches which are actuated by the platform when it comes to the low position and which trigger its stopping.

Par conséquent, en changeant la hauteur du bloc de porte bas, on ne change rien au fonctionnement : la plateforme s'arrêtera automatiquement au niveau du bloc quel que soit la hauteur de celui-ci.Consequently, by changing the height of the low door unit, nothing changes during operation: the platform will stop automatically at the unit regardless of its height.

Selon une caractéristique supplémentaire de l'invention, on notera qu'on peut procéder facilement au transport de la structure sur une courte distance sans la démonter (par exemple un déplacement le long d'une façade de bâtiment). Des chariots roulants sont mis en place sous la plateforme, par exemple un à chaque extrémité, et la plateforme est descendue le long des mâts jusqu'à ce qu'elle repose sur les chariots. En fin de descente, la plateforme repose sur les chariots roulants. On actionne alors les moteurs de levage de la plateforme, dans un sens tendant à la baisser le long des mâts. Comme la plateforme repose déjà sur les chariots roulants, elle ne peut pas s'abaisser plus, et par conséquent ce sont les mâts qui remontent légèrement. On peut alors faire rouler les chariots, sans avoir eu besoin de démonter les mâts.According to an additional characteristic of the invention, it will be noted that the structure can be easily transported over a short distance without dismantling it (for example a movement along a building facade). Rolling carriages are placed under the platform, for example one at each end, and the platform is lowered along the masts until it rests on the carriages. At the end of the descent, the platform rests on the rolling carts. The lifting motors of the platform are then actuated, in a direction tending to lower it along the masts. As the platform is already resting on the rolling carts, it cannot lower itself any more, and therefore the masts rise slightly. The carriages can then be rolled without having to dismantle the masts.

Enfin, on remarquera qu'un des avantages importants de l'invention est la possibilité de travailler suspendu à une façade, ou comme au flanc d'un navire par exemple (figure 14). Dans ce cas, les mâts sont montés, mais avec un seul point d'ancrage en tête de mât. C'est possible avec une structure bi-mât, alors que ce ne serait pas envisageable, compte tenu des efforts de torsion, avec une structure mono-mât. On peut alors utiliser des plateformes de grande longueur, du fait qu'elles sont plus résistantes car elles n'ont pas une largeur fortement réduite à l'endroit des mâts, contrairement aux plateformes habituelles qui sont échancrées pour le passage devant les ancrages. Cette possibilité n'est pas réservée aux façades évasées.Finally, it will be noted that one of the important advantages of the invention is the possibility of working suspended on a facade, or as on the side of a ship for example (Figure 14). In this case, the masts are mounted, but with only one anchor point at the top of the mast. This is possible with a twin-mast structure, whereas this would not be possible, given the torsional forces, with a single-mast structure. We can then use platforms of great length, because they are more resistant because they do not have a greatly reduced width at the location of the masts, unlike the usual platforms which are indented for the passage in front of the anchors. This possibility is not reserved for flared facades.

Les figures 12, 13 et 14 représentent l'utilisation d'une telle structure avec fixation uniquement en haut des mâts. Le point d'ancrage unique du mât 12 sur la façade 110 est désigné par la référence 140 sur la figure 12. On voit sur la figure 13 que la plateforme 10 comporte seulement deux ouvertures à contour fermé pour le passage des mâts 12 et 14, mais pas d'échancrures (ouvertures à contour ouvert) pour le passage de la plateforme au niveau de points d'ancrage.Figures 12, 13 and 14 show the use of such a structure with attachment only at the top of the masts. The single anchor point of the mast 12 on the facade 110 is designated by the reference 140 in FIG. 12. It can be seen in FIG. 13 that the platform 10 has only two openings with closed outline for the passage of the masts 12 and 14, but no notches (openings with open outline) for the passage of the platform at the level of anchoring points.

Afin d'améliorer le système et de répondre aux besoins de transport de matériaux avec conducteur embarqué, particulièrement pour le montage d'échafaudage et l'approvisionnement d'échafaudages déjà en place devant la plateforme, et pour l'approvisionnement de bâtiments (y compris des navires), il est prévu un système de porte-sas rétractable tel que dessiné dans la figure 15. La plateforme s'élève alors à au moins 50 cm de la façade. Ainsi, elle évite les risques de cisaillement pour les personnes se penchant depuis la façade ou depuis le plancher 140 de l'échafaudage. Lorsque la plateforme s'arrête, et uniquement lorsqu'elle est arrêtée, un système de sas se déploie, créant un passage protégé entre la plateforme et la façade. Un système de barrière peut empêcher le conducteur d'accéder à la zone de déchargement sans avoir déployé le système.In order to improve the system and meet the needs for transporting materials with an on-board conductor, particularly for scaffolding erection and the supply of scaffolding already in place in front of the platform, and for the supply of buildings (including ships), there is a retractable airlock system as shown in Figure 15. The platform then rises at least 50 cm from the front. Thus, it avoids the risk of shearing for people leaning from the front or from the floor 140 of the scaffolding. When the platform stops, and only when it is stopped, an airlock system deploys, creating a protected passage between the platform and the facade. A barrier system can prevent the operator from entering the unloading area without deploying the system.

La porte-sas comporte un bas de porte 141 et un pavillon 142 qui sont deux plaques longues s'ouvrant par basculement autour d'axes horizontaux. Une fois basculées, elles libèrent l'ouverture des vantaux 143 et 144 de la porte de la cabine. Ces vantaux 143 et 144 sont de préférence de type déployable comme les ailes d'un éventail en tissu. Quand les vantaux sont repliés les uns sur les autres, la porte-sas est étendue : ces vantaux empêchent les opérateurs de basculer latéralement dans le vide. Lorsqu'ils sont repliés, la plateforme est fermée. La plaque 141 mesure environ 50 cm de large.The airlock door comprises a door bottom 141 and a roof 142 which are two long plates opening by tilting around horizontal axes. Once tilted, they release the opening of leaves 143 and 144 of the cabin door. These leaves 143 and 144 are preferably of the deployable type like the wings of a fabric fan. When the leaves are folded over each other, the airlock door is extended: these leaves prevent operators from tipping sideways into the void. When folded, the platform is closed. Plate 141 is approximately 50 cm wide.

Claims (10)

  1. Self-elevating platform structure which includes two vertical masts (12, 14) at a distance from each other, each provided with a rack (28, 28'), with a moving carriage (24, 26) mounted on each mast and sliding along this mast, each carriage carrying a respective motor (58) cooperating with the rack, and a platform (10) fixed to the two carriages, mounted on each carriage is an auxiliary toothed pinion (80, 80') which cooperates with the rack and which is driven in rotation when the carriage moves, a transmission shaft (100) extending between the two masts and connecting the auxiliary toothed pinions of the two carriages so that they rotate in synchronism, characterised in that each carriage comprises a housing (54) for a vertical moving plate (50) which carries the motor and which is able to move vertically in this housing, with springs (62, 64) between the plate and the housing to allow damped transmission of the force exerted by the plate on the carriage under the action of the motor cooperating with the rack, and in that at least one detector (72) is provided in each carriage for detecting the compression of the transmission springs, this detector being connected to a control for the two motors in order to cut off the power supply to the two motors in the event of excessive compression of at least one spring.
  2. Structure according to Claim 1, characterised in that the auxiliary pinions are also carried by the vertical moving plate.
  3. Structure according to Claim 1, characterised in that the auxiliary pinions are carried directly by the carriage without springs being interposed.
  4. Structure according to Claim 1, characterised in that the auxiliary pinions are each carried by an auxiliary vertical floating plate different from the plate carrying the motor, with springs interposed between this auxiliary floating plate and the carriage.
  5. Structure according to one of Claims 1 to 4, intended to lift persons and materials up and down an external building facade, and to enter this building through a window at a height, this structure including a gate unit (113) protecting the access to this window, characterised in that this unit is fixed to a platform hoisting mast.
  6. Structure according to Claim 5, characterised in that a floor plate (116) fixed to the gate unit, and therefore secured to the mast, covers any gap which may exist between the elevator platform and the facade of the building.
  7. Structure according to one of Claims 1 to 6, for transporting persons and materials up and down at least one hoisting mast, with a mast-bottom gate unit (120), positioned at the bottom of the hoisting mast to protect access to the underneath of the platform, characterised in that this gate unit is mounted so as to movable in height up and down the mast to allow adjustment of the level at which the platform arrives at the bottom of its travel.
  8. Structure according to one of Claims 1 to 7, characterised in that its only fixing to a building to be undertaken is at the top end of the masts, and in that it comprises a platform extending between the masts and having no scallopings for the passage of anchorages to the facade of the building.
  9. Structure according to one of Claims 1 to 8, characterised in that at least one carriage carrying a motor (58) cooperates with its rack by means of a pair of two planetary toothed pinions mounted loose on the plate, and meshing in the rack and on a pinion of the motor.
  10. Structure according to one of Claims 1 to 9, characterised in that it includes a gate (141-144) protecting the access off the platform, this gate having a retractable part with a floor plate (116) fixed to the platform in order to cover any gap which may exist between the elevator platform and the facade of the building at the position of the opening.
EP92903292A 1991-01-08 1991-12-24 Self-raising platform Expired - Lifetime EP0565605B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR919100149A FR2671336B1 (en) 1991-01-08 1991-01-08 SELF-LIFTING PLATFORM.
FR9100149 1991-01-08
PCT/FR1991/001063 WO1992012091A1 (en) 1991-01-08 1991-12-24 Self-raising platform

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EP0565605A1 EP0565605A1 (en) 1993-10-20
EP0565605B1 true EP0565605B1 (en) 1995-10-11

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EP (1) EP0565605B1 (en)
AT (1) ATE128945T1 (en)
DE (1) DE69113816T2 (en)
ES (1) ES2081093T3 (en)
FR (1) FR2671336B1 (en)
WO (1) WO1992012091A1 (en)

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Publication number Priority date Publication date Assignee Title
DE4443629C3 (en) * 1994-12-08 2001-10-25 Geda Dechentreiter Gmbh & Co K Overload protection for a construction elevator
CN105236240A (en) * 2015-10-29 2016-01-13 广东裕华兴建筑机械制造有限公司 Guide frame climbing type work platform

Also Published As

Publication number Publication date
FR2671336B1 (en) 1994-06-17
ES2081093T3 (en) 1996-02-16
DE69113816T2 (en) 1996-05-23
EP0565605A1 (en) 1993-10-20
WO1992012091A1 (en) 1992-07-23
DE69113816D1 (en) 1995-11-16
FR2671336A1 (en) 1992-07-10
ATE128945T1 (en) 1995-10-15

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