EP0671195B1 - Motorized lifting device for hanging sceneries or the like - Google Patents

Motorized lifting device for hanging sceneries or the like Download PDF

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Publication number
EP0671195B1
EP0671195B1 EP95400450A EP95400450A EP0671195B1 EP 0671195 B1 EP0671195 B1 EP 0671195B1 EP 95400450 A EP95400450 A EP 95400450A EP 95400450 A EP95400450 A EP 95400450A EP 0671195 B1 EP0671195 B1 EP 0671195B1
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EP
European Patent Office
Prior art keywords
housing
chain
suspended
carrier bar
transmission shaft
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EP95400450A
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German (de)
French (fr)
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EP0671195A1 (en
Inventor
Jean-Louis Kosmerl
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MECASCENIC
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MECASCENIC
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63J—DEVICES FOR THEATRES, CIRCUSES, OR THE LIKE; CONJURING APPLIANCES OR THE LIKE
    • A63J1/00—Stage arrangements
    • A63J1/02—Scenery; Curtains; Other decorations; Means for moving same
    • A63J1/028—Means for moving hanging scenery

Definitions

  • the invention relates to the handling of suspended decorations or the like, in particular decorations, lighting projectors, sound equipment, and other accessories, provided in halls intended for performances (theaters or concert halls for example).
  • a device comprising a geared motor and a large drum attached thereto, and whose axis is perpendicular to the vertical plane passing through the support bar. Cables wound on this common drum pass over pulleys, before being hung on the carrier bar vertically from these pulleys.
  • Such a direct draft system has the drawback of being extremely bulky (in the direction of the axis of the drum), which is very inconvenient when several devices have to be placed side by side to handle a plurality of hanging decorations.
  • a counterweight roller chain device has also been proposed, the chain passing over a pinion wedged on the output shaft of a geared motor, and on other pinions with fixed axis for connection to a vertically movable lateral counterweight. Cables fixed at the top of the counterweight pass over respective pulleys overhanging said counterweight, then over pulleys which are vertical to the attachment points of the support bar.
  • Such a system is compact and safe, but it involves providing an expensive infrastructure, in particular a counterweight chimney which is necessarily made to measure.
  • a device with a propeller shaft overhanging the carrier bar has also been proposed, on which are fixed several threaded drums from which cables are directly unwound vertically to the respective attachment points on the carrier bar (see for example FR-A- 2,481,607).
  • the disadvantage of such a system with several threaded drums is that the carrier bar is moved laterally as soon as its height is changed (on one side or the other depending on whether the cables are unwound or wound).
  • it has been proposed to replace the cables with straps, the drums then no longer being threaded, which effectively eliminates the lateral displacement of the support bar during a change of height see for example DE-A -27 22 143).
  • each strap is wound flat on itself, so that the diameter gradually increases during winding, resulting in a loss of torque and an increase in speed.
  • the (variable) winding diameter of the straps can vary from one drum to another (due to variations in tension resulting from the load applied to each strap), which frequently results in a defect of -lead of the carrying bar at the end of the maneuver.
  • Another device has been proposed with a gear motor and drum with an axis perpendicular to the vertical plane passing through the support bar, but with a common tractor cable wound on the drum, extending horizontally. up to its end which is fixed to a block for connection to the hanging cables passing over respective pulleys.
  • the drawback of such a device is that it has to organize the guiding of the horizontal section of the towing cable.
  • variations in the height of the carrying bar are de facto limited by the available horizontal travel of the towing cable.
  • the invention aims to design a handling device which does not have the aforementioned drawbacks and limitations.
  • the object of the invention is therefore to provide a motorized device for handling hanging decorations or the like which is both compact, flexible and safe, with the possibility of having couples. high and constant, while being simple in structure and of reasonable manufacturing cost.
  • the beam is braced and braced, and its length is slightly greater than that of the support bar.
  • the motor-reducer assembly is an electrically operated motor-brake reducer with incorporated torque limiter, this motor-brake reducer being housed in the central space of the beam so as to be integrated into the volume of that -this.
  • the transmission shaft is coupled directly to the end of the output shaft of the brake gear motor.
  • each attachment means comprises a housing in which pivots the associated chain nut, said housing being fixed to the beam, preferably being suspended inside the latter.
  • the housing is made of two complementary half-shells whose joint plane coincides with the vertical plane of symmetry of the chain nut.
  • the housing is suspended from the beam by a central plate arranged at the joint plane, and the fixing of this central plate is of the pendulum type, with a movement in the direction of the transmission shaft.
  • the housing is suspended by means of elastic means, from a stirrup secured to the beam and to which is also suspended a central sheet arranged at the joint plane.
  • the two half-shells forming the housing define a lower bearing edge with which cooperates one or the other of two chain stops serving to delimit the range of variation of the lifting height of the carrying bar .
  • the housing or the central sheet associated with it carries two sensors with which cooperates, directly or by means of a bending plate integral with said housing, one or the other of two chain stops serving to delimit the range of variation of the lifting height of the carrying bar.
  • the two half-shells forming the housing prefferably support a casing on which the chain receptacle is hung.
  • the casing is supported by a lower edge on a horizontal member of the beam.
  • the drive shaft is interrupted at each case, the coupling link between the adjacent sections being provided by a splined shaft passing through the housing, the associated chain nut being threaded directly onto this splined shaft.
  • the beam is produced in the form of sections placed end to end, including a first section incorporating the geared motor unit and a first housing, and at least one additional section incorporating one or two housings.
  • the beam is itself suspended by rollers or rollers on rails which extend perpendicular to the main direction of said beam, so as to be able to move the decoration or material suspended perpendicularly to his plan.
  • FIG. 1 illustrates a motorized device 1 in accordance with the invention, allowing the handling of hanging decorations or the like hung on a horizontal support bar 50.
  • a decoration 51 is illustrated in dashed lines, hung by rings 52 on the support bar 50.
  • sets it is understood that the invention does not only apply to hanging sets in theaters or concert halls, but also applies to projectors lighting, sound equipment, and other accessories provided in performance halls.
  • the motorized device 1 firstly comprises a three-dimensional and self-supporting horizontal beam 2, which delimits over its entire useful length a central space 6.
  • the beam 2 is formed by horizontal members 3, which are connected between them by bars 4 and 5 ensuring bracing and bracing of this beam.
  • the three-dimensional beam 2 here has a substantially rectangular section, but it goes without saying that a different shape can be chosen, for example a triangular section defined by three horizontal members.
  • the three-dimensional and self-supporting beam 2 can be made of steel if one seeks above all a high rigidity, in order to be able to handle decorations of significant weight, or aluminum if one seeks above all to have a device light and transportable.
  • the motorized device 1 further comprises a geared motor assembly 8 mounted at one end of the beam, and the output shaft of which is coupled to a transmission shaft 18 extending horizontally in the central space 6 of the three-dimensional beam 2.
  • the motor-reducer assembly 8 will preferably be an electrically operated motor-brake reducer with incorporated torque limiter.
  • a total integration of the geared motor assembly 8 is shown in the volume of the beam 2, that is to say that this geared motor is entirely housed in the central space 6 of said beam, which considerably reduces the overall dimensions and facilitates installation.
  • the geared motor assembly 8 will for example be bolted to a spacer plate 7 welded to the members 3 and it will be connected by cables such as the cable 10 to an associated control block 9 arranged at the end of the three-dimensional beam 2, said block being for example fixed on a spacer plate 11.
  • a remote control means connected to this control unit 9, in the form of a control box 12 mounted at the end of a cable of connection 13, and comprising two buttons 14 and 15 respectively making it possible to control the raising or lowering of the carrier bar 50 by rotating the output shaft of the brake gear motor, and the transmission shaft which is coupled to it, one way or the other.
  • the carrier bar 5O is suspended by chains 21, the lower end of which is fixed to this bar by means of an associated swivel 22. These chain sections 21 are naturally driven by the transmission shaft 18, as will be explained in more detail below, with reference to Figures 2 to 4.
  • FIG. 2 we find the three-dimensional and self-supporting beam 2 previously described, and we can see, at the end of this beam which is opposite to that receiving the brake gear motor 8, an end spacer plate 19 fixed to the four members 3.
  • FIG. 2 there is a distinction between the output shaft 16 of the brake gear motor with incorporated torque limiter 8, and the shaft transmission 18 is here directly coupled to the end of this output shaft 16 by means of a coupling 17 of conventional type.
  • a coupling 17 of conventional type Such a direct end coupling mode offers the advantage of direct transmission of the engine torque, without passing through intermediate pinions, and gives a very satisfactory robustness.
  • the motorized device 1 comprises a succession of attachment means 2O serving to suspend the carrier bar 5O while being able to vary the height thereof.
  • each hooking means 2O consists of a chain nut mounted coaxially on the transmission shaft 18 and rotated by it, and of a chain section 21 passing over this chain nut, said section being formed, whatever the height of the carrier bar 50, of a vertical strand whose free end is hooked on the carrier bar and of a dead strand received in an associated receptacle 24.
  • the transmission shaft 18 may be in one piece over the entire length of the three-dimensional beam 2, or alternatively, as has been shown here, produced in a plurality of successive sections which are connected together at the level of housings 23 which are fixed to the beam 2, preferably being suspended inside the latter.
  • Such an embodiment confers great flexibility, insofar as it is possible to adapt the length of the beam to the environment concerned, or even to transform the length of this beam when it is desired to dismantle the device for the '' set up in another room. Indeed, it suffices for example to disassemble a section of the beam and the corresponding section of the drive shaft, which immediately makes it possible to reduce the length of the beam accordingly.
  • the length of the beam will be slightly greater than that of the carrier bar 50.
  • this proximity sensor (for example of the inductive type) making it possible to detect the presence of the swivel of the chain , or as a variant of an end of travel stop mounted on the chain above this swivel, when the carrier bar is raised to the maximum desired height.
  • This proximity sensor is naturally connected directly to the power supply of the gear motor 8. It should be noted that if the initial travel is exceeded or if this proximity sensor malfunctions, the motorized assembly will slip. thanks to the torque limiter incorporated in the brake gear motor 8.
  • Another chain stopper mounted on the other chain strand (which is received in the aforementioned receptacle) will also be provided, this second stop being used to limit the low level of the suspended bar, by cooperation either with the lower edge of the associated housing 23, or with an associated proximity sensor.
  • this second stop being used to limit the low level of the suspended bar, by cooperation either with the lower edge of the associated housing 23, or with an associated proximity sensor.
  • provision will also preferably be made for chain stops, but the function provided by these stops will then be to prevent the chain from accidentally escaping during installation of the device.
  • the transmission shaft 18 is interrupted at the level of the housing 23, the coupling connection between the adjacent sections being ensured by a splined shaft 28 passing through this housing, splined shaft, the two ends of which are received in splined shaft end pieces 27 mounted at the end of the adjacent sections of the transmission shaft 18.
  • a splined shaft 28 passing through this housing, splined shaft, the two ends of which are received in splined shaft end pieces 27 mounted at the end of the adjacent sections of the transmission shaft 18.
  • the associated chain nut, denoted 29 which rotates at the inside of the housing 23 thanks to the presence of associated ball bearings 30.
  • the housing 23 is fixed to the beam 2, preferably being suspended inside the latter so as to preserve the integration of the components in the interior volume of the three-dimensional beam.
  • the housing 23 is produced in two complementary half-shells 23.1, 23.2, the joint plane Z of which coincides with the vertical plane of symmetry of the chain nut 29, said housing being suspended from the beam 2 by a central plate 31 precisely arranged at this joint plane.
  • the sheet metal 31 is thus clamped between the two complementary half-shells 23.1, 23.2, which are bolted together, the projecting part of the central sheet metal 31 then serving to secure the three-dimensional beam 2 on the spacer (s) concerned.
  • a fixing is shown produced by tightening the central sheet 31 between two spacers 4 connected by associated bolts 32, with the interposition of elastic washers 33.
  • Such an arrangement is particularly advantageous in this case, because it allows to define a suspension of the pendulum type housing 23, with a clearance in the direction of the transmission shaft 18 denoted X.
  • This pendulum type suspension of each of the housings 23 allows self-alignment of the different sections of transmission shaft .
  • the chain nut 29 is perfectly protected inside its housing 23, and, as can be seen more clearly in FIG. 4, this housing has two vertical passages 34, of cruciform cross section, for the passage of the two strands of the chain section concerned.
  • this housing has two vertical passages 34, of cruciform cross section, for the passage of the two strands of the chain section concerned.
  • FIG. 4 a clear distinction is made between the chain section 21 passing over the chain nut 29, which section is formed, whatever the height of the load-bearing bar 50, of a vertical strand 21.1 whose free end is hooked on the carrier bar 5O by the swivel 22, and a dead strand 21.2 which is received in an associated receptacle 24 fixed to the beam 2.
  • the attachment to the carrier bar 5O is ensured by the sockets 53 vertically passing through this bar, and welded thereto, through which passes the threaded rod 55 of a bolt, tightened by nuts 54, and the head of which is received inside the swivel 22.
  • the receptacle of chain 24 is for example fixed by a metal strip 37 to the beam 2, and it will be made of a flexible material, for example resistant plasticized canvas. In this way, when the carrier bar is raised, the dead strand 21.2 of each chain section 21 is gradually received in its associated receptacle 24.
  • the device according to the invention provides a very large number of advantages, the most important of which will be noted below.
  • the three-dimensional and self-supporting beam 2 is first of all both compact, and the integration of the various components of the motorized device, and in in particular, the brake gear motor with incorporated torque limiter does not interfere with the overall compactness.
  • the three-dimensional horizontal beam 2 may alternatively be part of a more complex bearing structure, in the form of a U, a T, or even an L.
  • provision may be made to arrange the assembly motor-reducer at another location in the U, T, or L structure, rather than at the end of the horizontal beam from which the carrier bar is suspended.
  • angle references it will suffice to use angle references to transmit the rotational movement to the transmission shaft extending horizontally in the central space of the three-dimensional self-supporting beam 2.
  • This chain suspension is also advantageous insofar as it suffices to change the length of the chain sections to adapt to a different suspension height of the support bar. It should then be noted that, whatever the lifting height of the support bar, the section of the beam remains the same.
  • the chain sections being in any case of the same length, these chains do not cause any difference in level of the load-bearing bar, and whatever the height thereof, which permanently guarantees perfect horizontality of this load-bearing bar .
  • the chain sections can completely disappear in the sleeves of a false ceiling. It is also possible to direct one or more sections of chains in a receptacle, for use of a single section of chain of the device, which allows for example to adapt the device of the invention to the lifting of a particular assembly such than a chandelier.
  • the arrangement of the three-dimensional, self-supporting beam, with its internal drive shaft made up of several sections placed end to end, makes it possible to obtain a variable length, which gives great flexibility. of installation.
  • the rigidity conferred by the three-dimensional and self-supporting beam considerably reduces the number of suspensions for fixing in the hangers or frames of the room, and avoids the establishment of expensive and bulky primary structures.
  • FIG. 2 it can be seen that the beam 2 is itself suspended by rollers or rollers 32, for example fixed at the top of sheets 31 clamped between two adjacent spacers 4, at rails 33 suspended by threaded rods 34, which rails extend perpendicular to the main direction of the beam, which makes it possible to move the corresponding decoration perpendicular to its plan.
  • rollers or rollers 32 for example fixed at the top of sheets 31 clamped between two adjacent spacers 4
  • rails 33 suspended by threaded rods 34, which rails extend perpendicular to the main direction of the beam, which makes it possible to move the corresponding decoration perpendicular to its plan.
  • Such a system is particularly advantageous when a large number of devices are placed side by side, that is to say for large theaters or concert halls.
  • the device illustrated in FIGS. 5 to 9 is first of all remarkable in that the beam 2 is produced in the form of sections placed end to end (here two in number), including a first section 2.1 incorporating the motor assembly reduction gear 8 with its control unit 9 and a housing 23, and at least one (here) an additional section 2.2 incorporating one or two housings 23.
  • the device 1 differs from the previous one by the method of attachment of the boxes suspended from the beam, and by the embodiment of the associated chain receptacle.
  • each housing 23 of a U-shaped bracket 6O welded to the beam 2, the wings 61 of which allow two smooth studs 62 to be threaded provided at their ends with grooves 64 associated with a ring of locking.
  • each half-shell 23.1, 23.2 forming the housing 23, as well as the central sheet 31 arranged at the joint plane, is hung on these studs 62.
  • the half-shells are furnished with an elastic sleeve respective 63.1, 63.2, allowing a slight pendulum clearance for the housing. This results in a suspension that is both robust and flexible.
  • the two half-shells 23.1, 23.2 support below a casing 65, fixed by bolts 66, in the lower part of which is hung the chain receptacle 24.
  • the housing 65 has, for the passage of the front strand 21.1, a recess 67.
  • the receptacle is thus fixed, at an edge forming a belt 37, to the housing 65, which is preferably supported by a lower edge 75 on a horizontal frame 3 of the beam 2, so as to better support the weight of the chain in the high position of the load-bearing bar 50.
  • FIG. 9 equipment has also been illustrated which will preferably be provided on the first housing of the motorized section.
  • the central plate 31 has two ears 31.1 and 31.2 projecting from the housing, serving to hang on each a sensor 68.1, 68.2 having a contact button 69.1, 69.2 turned downwards.
  • a block 71 secured to the housing 23 further carries a double plate 70.1, 70.2 provided with a respective opening 72.1, 72.2 for the passage of the chain 21.
  • Chain stops 26.1, 26.2 cooperate with these sensors, here via of the flexing plate 70.1, 70.2, respectively in the high position and in the low position of the support bar 50.
  • the sensors 68.1, 68.2 allow, when actuated by the associated chain stopper 26.1, 26.2, to control the shutdown of the associated drive motor or control block, which constitutes very reliable safety.

Abstract

The motorised handling system for suspended scenery fastened on a horizontal carrying bar (50) comprises a horizontal three-dimensional carrying beam (2) with a central space (6). A motor reduction assembly (8) mounted at one end of the beam has its output shaft (17) coupled to a transmission shaft (18) extending horizontally in the central space. A succession of fasteners (20) suspending the carrying bar can vary its height. Each fastener comprises a chain cog mounted coaxially on the transmission shaft and rotated by it. A chain section (21) which passes on the chain cog is formed with its clear vertical run fastened on the carrying bar, and its dead length received in an associated container (24).

Description

L'invention concerne la manutention des décors suspendus ou analogues, notamment des décors, projecteurs d'éclairage, matériels son, et autres accessoires, prévus dans les salles à vocation de spectacles (salles de théâtre ou de concert par exemple).The invention relates to the handling of suspended decorations or the like, in particular decorations, lighting projectors, sound equipment, and other accessories, provided in halls intended for performances (theaters or concert halls for example).

Ces éléments suspendus sont en général accrochés directement, par des anneaux ou des colliers, sur une barre porteuse horizontale, que les spécialistes appellent d'ailleurs la "porteuse".These suspended elements are generally hung directly, by rings or necklaces, on a horizontal support bar, which specialists also call the "carrier".

Pour les petites salles, équipées de décors ou matériels légers, on utilise souvent un système rudimentaire à main, avec un accrochage des cordages de suspension sur des palettes fixées au mur.For small rooms, equipped with decorations or light materials, a rudimentary hand system is often used, with hanging hanging ropes on pallets fixed to the wall.

Un tel système devient rapidement inutilisable dès qu'il s'agit de lever des décors ou matériels plus pesants, et sur des hauteurs élevées. On fait alors appel à des dispositifs motorisés pour assurer la manutention des décors ou autres matériels suspendus.Such a system quickly becomes unusable when it comes to lifting heavier decorations or equipment, and at high heights. Motorized devices are then used to handle the decorations or other suspended materials.

On connaît déjà de nombreux types de tels dispositifs motorisés, fonctionnant avec des câbles, des sangles ou des chaînes.Numerous types of such motorized devices are already known, operating with cables, straps or chains.

On a ainsi proposé un dispositif comportant un moto-réducteur et un gros tambour qui lui est accolé, et dont l'axe est perpendiculaire au plan vertical passant par la barre porteuse. Des câbles enroulés sur ce tambour commun passent sur des poulies, avant d'être accrochés sur la barre porteuse à la verticale de ces poulies. Un tel système à tirage direct présente l'inconvénient d'être extrêmement encombrant (dans la direction de l'axe du tambour), ce qui est très gênant lorsque plusieurs dispositifs doivent être accolés pour assurer la manutention d'une pluralité de décors suspendus.A device has thus been proposed comprising a geared motor and a large drum attached thereto, and whose axis is perpendicular to the vertical plane passing through the support bar. Cables wound on this common drum pass over pulleys, before being hung on the carrier bar vertically from these pulleys. Such a direct draft system has the drawback of being extremely bulky (in the direction of the axis of the drum), which is very inconvenient when several devices have to be placed side by side to handle a plurality of hanging decorations.

On a également proposé un dispositif à chaîne à rouleaux et à contrepoids, la chaîne passant sur un pignon calé sur l'arbre de sortie d'un moto-réducteur, et sur d'autres pignons d'axe fixe pour une liaison à un contrepoids latéral mobile verticalement. Des câbles fixés en haut du contrepoids passent sur des poulies respectives surplombant ledit contrepoids, puis sur des poulies qui sont à la verticale des points d'accrochage de la barre porteuse. Un tel système est peu encombrant et sûr, mais il implique de prévoir une infrastructure onéreuse, notamment une cheminée de contrepoids qui est nécessairement réalisée sur mesure.A counterweight roller chain device has also been proposed, the chain passing over a pinion wedged on the output shaft of a geared motor, and on other pinions with fixed axis for connection to a vertically movable lateral counterweight. Cables fixed at the top of the counterweight pass over respective pulleys overhanging said counterweight, then over pulleys which are vertical to the attachment points of the support bar. Such a system is compact and safe, but it involves providing an expensive infrastructure, in particular a counterweight chimney which is necessarily made to measure.

On a encore proposé un dispositif à arbre de transmission surplombant la barre porteuse, et sur lequel sont calés plusieurs tambours filetés desquels des câbles sont directement déroulés verticalement jusqu'aux points d'accrochage respectifs sur la barre porteuse (voir par exemple FR-A-2.481.607). L'inconvénient d'un tel système à plusieurs tambours filetés est que la barre porteuse est déplacée latéralement dès que sa hauteur est modifiée (d'un côté ou de l'autre selon que les câbles sont dévidés ou enroulés). Pour pallier cet inconvénient, on a proposé de remplacer les câbles par des sangles, les tambours n'étant alors plus filetés, ce qui supprime effectivement le déplacement latéral de la barre porteuse lors d'un changement de hauteur (voir par exemple DE-A-27 22 143). Cependant, chaque sangle s'enroule à plat sur elle-même, de sorte que le diamètre augmente progressivement lors de l'enroulement, d'où une perte de couple et une augmentation de la vitesse. De plus, le diamètre (variable) d'enroulement des sangles peut varier d'un tambour à l'autre (en raison des variations de la tension résultant de la charge appliquée à chaque sangle), ce qui entraîne fréquemment un défaut d'à-plomb de la barre porteuse en fin de manoeuvre.A device with a propeller shaft overhanging the carrier bar has also been proposed, on which are fixed several threaded drums from which cables are directly unwound vertically to the respective attachment points on the carrier bar (see for example FR-A- 2,481,607). The disadvantage of such a system with several threaded drums is that the carrier bar is moved laterally as soon as its height is changed (on one side or the other depending on whether the cables are unwound or wound). To overcome this drawback, it has been proposed to replace the cables with straps, the drums then no longer being threaded, which effectively eliminates the lateral displacement of the support bar during a change of height (see for example DE-A -27 22 143). However, each strap is wound flat on itself, so that the diameter gradually increases during winding, resulting in a loss of torque and an increase in speed. In addition, the (variable) winding diameter of the straps can vary from one drum to another (due to variations in tension resulting from the load applied to each strap), which frequently results in a defect of -lead of the carrying bar at the end of the maneuver.

On a aussi proposé un autre dispositif à moto-réducteur et tambour d'axe perpendiculaire au plan vertical passant par la barre porteuse, mais avec un câble tracteur commun enroulé sur le tambour, s'étendant horizontalement jusqu'à son extrémité qui est fixée à un bloc de raccordement aux câbles d'accrochage passant sur des poulies respectives. Un tel dispositif a pour inconvénient de devoir organiser le guidage du tronçon horizontal du câble tracteur. De plus, les variations de hauteur de la barre porteuse sont de facto limitées par la course horizontale disponible du câble tracteur.Another device has been proposed with a gear motor and drum with an axis perpendicular to the vertical plane passing through the support bar, but with a common tractor cable wound on the drum, extending horizontally. up to its end which is fixed to a block for connection to the hanging cables passing over respective pulleys. The drawback of such a device is that it has to organize the guiding of the horizontal section of the towing cable. In addition, variations in the height of the carrying bar are de facto limited by the available horizontal travel of the towing cable.

On a encore proposé de juxtaposer des petits tambours, chaque tambour servant à enrouler un câble passant sur une poulie haute de renvoi, puis sur une poulie qui est à la verticale du point d'accrochage. Un réducteur à roue et vis sans fin est associé à ces tambours pour les faire tourner tous ensemble (soit en actionnant une manivelle à la main, soit avec un moteur baladeur dont le mandrin est amené devant le bloc de tambours concerné). Un tel système présente l'inconvénient d'être très lent, car il faut effectuer un grand nombre de tours pour modifier d'une faible dimension la hauteur de la barre porteuse. De plus, les câbles s'enroulent sur eux-mêmes, de sorte que l'on retrouve les inconvénients précités de défaut d'horizontalité de la barre porteuse.It has also been proposed to juxtapose small drums, each drum serving to wind a cable passing over a high deflection pulley, then over a pulley which is vertical to the point of attachment. A wheel and worm reducer is associated with these drums to rotate them all together (either by operating a crank by hand, or with a sliding motor whose mandrel is brought in front of the drum unit concerned). The disadvantage of such a system is that it is very slow, since a large number of turns must be made to modify the height of the support bar by a small dimension. In addition, the cables are wound on themselves, so that we find the aforementioned drawbacks of lack of horizontality of the carrier bar.

L'état de la technique est également illustré par les structures à une ou plusieurs poutres tridimensionnelles (formant une barre ou un cadre porte-projecteurs), cette ou ces poutres étant suspendues par des chaînes à des palans. Un tel système reste limité aux salles présentant une hauteur énorme, car l'élingage nécessite une hauteur élevée.The state of the art is also illustrated by structures with one or more three-dimensional beams (forming a bar or a projector-carrying frame), this or these beams being suspended by chains from hoists. Such a system remains limited to rooms with an enormous height, since slinging requires a high height.

L'invention vise à concevoir un dispositif de manutention ne présentant pas les inconvénients et limitations précités.The invention aims to design a handling device which does not have the aforementioned drawbacks and limitations.

L'invention a ainsi pour objet de réaliser un dispositif motorisé de manutention de décors suspendus ou analogues qui soit à la fois peu encombrant, de fonctionnement souple et sûr, avec possibilité d'avoir des couples élevés et constants, tout en étant de structure simple et de coût de fabrication raisonnable.The object of the invention is therefore to provide a motorized device for handling hanging decorations or the like which is both compact, flexible and safe, with the possibility of having couples. high and constant, while being simple in structure and of reasonable manufacturing cost.

Il s'agit plus particulièrement d'un dispositif motorisé de manutention de décors suspendus ou analogues accrochés sur une barre porteuse horizontale, caractérisé en ce qu'il comporte:

  • une poutre horizontale tridimensionnelle et auto-portante, délimitant sur toute sa longueur utile un espace central ;
  • un ensemble moto-réducteur monté à une extrémité de la poutre, et dont l'arbre de sortie est accouplé à un arbre de transmission s'étendant horizontalement dans ledit espace central ;
  • une succession de moyens d'accrochage servant à suspendre la barre porteuse tout en pouvant faire varier la hauteur de celle-ci, chaque moyen d'accrochage se composant d'une noix de chaîne montée coaxialement sur l'arbre de transmission et entraînée en rotation par celui-ci, et d'un tronçon de chaîne passant sur la noix de chaîne, ledit tronçon étant formé, quelle que soit la hauteur de la barre porteuse, d'un brin vertical dont l'extrémité libre est accrochée sur la barre porteuse, et d'un brin mort reçu dans un réceptacle associé.
It is more particularly a motorized device for handling suspended decorations or the like hung on a horizontal support bar, characterized in that it comprises:
  • a three-dimensional, self-supporting horizontal beam, delimiting a central space over its entire useful length;
  • a gear motor assembly mounted at one end of the beam, and the output shaft of which is coupled to a transmission shaft extending horizontally in said central space;
  • a succession of attachment means used to suspend the carrier bar while being able to vary the height thereof, each attachment means consisting of a chain nut mounted coaxially on the driveshaft and driven in rotation by the latter, and of a chain section passing over the chain nut, said section being formed, whatever the height of the support bar, of a vertical strand whose free end is hooked on the support bar , and a dead strand received in an associated receptacle.

De préférence, la poutre est contreventée et entretoisée, et sa longueur est légèrement supérieure à celle de la barre porteuse.Preferably, the beam is braced and braced, and its length is slightly greater than that of the support bar.

Avantageusement encore, l'ensemble moto-réducteur est un moto-réducteur frein à fonctionnement électrique et à limiteur de couple incorporé, ce moto-réducteur frein étant logé dans l'espace central de la poutre de façon à être intégré dans le volume de celle-ci. En particulier, l'arbre de transmission est accouplé directement en bout de l'arbre de sortie du moto-réducteur frein.Advantageously also, the motor-reducer assembly is an electrically operated motor-brake reducer with incorporated torque limiter, this motor-brake reducer being housed in the central space of the beam so as to be integrated into the volume of that -this. In particular, the transmission shaft is coupled directly to the end of the output shaft of the brake gear motor.

Il est par ailleurs intéressant de prévoir que chaque moyen d'accrochage comporte un boîtier dans lequel tourillonne la noix de chaîne associée, ledit boîtier étant fixé à la poutre, en étant de préférence suspendu à l'intérieur de celle-ci.It is also advantageous to provide that each attachment means comprises a housing in which pivots the associated chain nut, said housing being fixed to the beam, preferably being suspended inside the latter.

Avantageusement alors, le boîtier est réalisé en deux demi-coquilles complémentaires dont le plan de joint coïncide avec le plan vertical de symétrie de la noix de chaîne.Advantageously then, the housing is made of two complementary half-shells whose joint plane coincides with the vertical plane of symmetry of the chain nut.

En particulier alors, le boîtier est suspendu à la poutre par une tôle centrale agencée au niveau du plan de joint, et la fixation de cette tôle centrale est de type pendulaire, avec un débattement dans la direction de l'arbre de transmission. En variante, le boîtier est suspendu par l'intermédiaire de moyens élastiques, à un étrier solidaire de la poutre et auquel est également suspendue une tôle centrale agencée au niveau du plan de joint.In particular then, the housing is suspended from the beam by a central plate arranged at the joint plane, and the fixing of this central plate is of the pendulum type, with a movement in the direction of the transmission shaft. As a variant, the housing is suspended by means of elastic means, from a stirrup secured to the beam and to which is also suspended a central sheet arranged at the joint plane.

De préférence alors, les deux demi-coquilles formant le boîtier définissent un bord inférieur d'appui avec lequel coopère l'une ou l'autre de deux butées de chaîne servant à délimiter la plage de variation de la hauteur de levage de la barre porteuse. En variante, le boîtier ou la tôle centrale qui lui est associée porte deux capteurs avec lesquels coopère, directement ou par l'intermédiaire d'une plaquette fléchissante solidaire dudit boîtier, l'une ou l'autre de deux butées de chaîne servant à délimiter la plage de variation de la hauteur de levage de la barre porteuse.Preferably then, the two half-shells forming the housing define a lower bearing edge with which cooperates one or the other of two chain stops serving to delimit the range of variation of the lifting height of the carrying bar . As a variant, the housing or the central sheet associated with it carries two sensors with which cooperates, directly or by means of a bending plate integral with said housing, one or the other of two chain stops serving to delimit the range of variation of the lifting height of the carrying bar.

Il est alors avantageux que les deux demi-coquilles formant le boîtier supportent inférieurement un carter sur lequel est accroché le réceptacle de chaîne. En particulier, le carter est en appui par un bord inférieur sur une membrure horizontale de la poutre.It is then advantageous for the two half-shells forming the housing to support a casing on which the chain receptacle is hung. In particular, the casing is supported by a lower edge on a horizontal member of the beam.

Conformément à une autre caractéristique particulière, l'arbre de transmission est interrompu au niveau de chaque boîtier, la liaison d'accouplement entre les tronçons adjacents étant assurée par un arbre cannelé traversant le boîtier, la noix de chaîne associée étant enfilée directement sur cet arbre cannelé. De préférence alors, la poutre est réalisée sous la forme de tronçons mis bout à bout, dont un premier tronçon incorporant l'ensemble moto-réducteur et un premier boîtier, et au moins un tronçon supplémentaire incorporant un ou deux boîtiers.According to another particular characteristic, the drive shaft is interrupted at each case, the coupling link between the adjacent sections being provided by a splined shaft passing through the housing, the associated chain nut being threaded directly onto this splined shaft. Preferably then, the beam is produced in the form of sections placed end to end, including a first section incorporating the geared motor unit and a first housing, and at least one additional section incorporating one or two housings.

Enfin, il peut s'avérer intéressant de prévoir que la poutre est elle-même suspendue par des galets ou roulettes à des rails qui s'étendent perpendiculairement à la direction principale de ladite poutre, de façon à pouvoir déplacer le décor ou matériel suspendu perpendiculairement à son plan.Finally, it may be advantageous to provide that the beam is itself suspended by rollers or rollers on rails which extend perpendicular to the main direction of said beam, so as to be able to move the decoration or material suspended perpendicularly to his plan.

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lumière de la description qui va suivre et des dessins annexés, concernant un mode de réalisation particulier, en référence aux figures où :

  • la figure 1 est une vue en perspective d'un dispositif conforme à l'invention, avec la barre porteuse en position haute ;
  • la figure 2 montre un dispositif analogue en vue frontale, avec un équipement supplémentaire d'accrochage à des rails suspendus, la vue montrant quatre moyens d'accrochage comportant notamment chacun un boîtier recevant une noix de chaîne ;
  • la figure 3, et la figure 4 qui en est la coupe selon IV-IV, illustrent à plus grande échelle l'un des moyens d'accrochage à chaîne, avec son boîtier suspendu dans la poutre et son réceptacle de brin mort de chaîne, ladite chaîne étant en outre équipée des deux butées de chaîne servant à délimiter la plage de variation de la hauteur de levage de la barre porteuse ;
  • la figure 5 est une vue frontale d'une variante du dispositif précité, avec la barre porteuse en position haute ;
  • la figure 6 est une vue partielle à plus grande échelle du dispositif de la figure 5, et la figure 7 une vue en bout de cette dernière ;
  • les figures 8 et 9 sont deux coupes qui sont à rapprocher de celles des figures 3 et 4, illustrant à plus grande échelle l'agencement du boîtier et du réceptacle de chaîne dans la variante des figures 5 à 7, avec en outre deux capteurs de fin de course illustrés sur la figure 9.
Other characteristics and advantages of the invention will appear more clearly in the light of the description which follows and of the appended drawings, relating to a particular embodiment, with reference to the figures in which:
  • Figure 1 is a perspective view of a device according to the invention, with the carrier bar in the high position;
  • FIG. 2 shows a similar device in front view, with additional attachment equipment for hanging rails, the view showing four attachment means each comprising in particular a housing receiving a chain nut;
  • FIG. 3, and FIG. 4 which is a section thereof according to IV-IV, illustrate on a larger scale one of the chain hooking means, with its casing suspended in the beam and its receptacle of dead chain strand, said chain being further equipped with two chain stops serving to delimit the range of variation of the lifting height of the carrying bar;
  • Figure 5 is a front view of a variant of the above device, with the carrier bar in position high;
  • Figure 6 is a partial view on a larger scale of the device of Figure 5, and Figure 7 an end view of the latter;
  • Figures 8 and 9 are two sections which are close to those of Figures 3 and 4, illustrating on a larger scale the arrangement of the housing and the chain receptacle in the variant of Figures 5 to 7, with in addition two sensors limit switch illustrated in figure 9.

La figure 1 illustre un dispositif motorisé 1 conforme à l'invention, permettant la manutention de décors suspendus ou analogues accrochés sur une barre porteuse horizontale 50. On a illustré en traits mixtes un décor 51, accroché par des anneaux 52 sur la barre porteuse 50. Dans la suite de la description, il sera fait référence à des "décors", mais il est entendu que l'invention ne s'applique pas seulement aux décors suspendus des salles de théâtre ou de concert, mais s'applique également aux projecteurs d'éclairage, matériels son, et autres accessoires prévus dans les salles à vocation de spectacles.FIG. 1 illustrates a motorized device 1 in accordance with the invention, allowing the handling of hanging decorations or the like hung on a horizontal support bar 50. A decoration 51 is illustrated in dashed lines, hung by rings 52 on the support bar 50 In the following description, reference will be made to "sets", but it is understood that the invention does not only apply to hanging sets in theaters or concert halls, but also applies to projectors lighting, sound equipment, and other accessories provided in performance halls.

Le dispositif motorisé 1 comporte tout d'abord une poutre horizontale tridimensionnelle et auto-portante 2, qui délimite sur toute sa longueur utile un espace central 6. En l'espèce, la poutre 2 est constituée par des membrures horizontales 3, qui sont raccordées entre elles par des barres 4 et 5 assurant un entretoisement et un contreventement de cette poutre. La poutre tridimensionnelle 2 est ici de section sensiblement rectangulaire, mais il va de soi que l'on pourra choisir une forme différente, par exemple une section triangulaire définie par trois membrures horizontales. La poutre tridimensionnelle et auto-portante 2 pourra être réalisée en acier si l'on cherche avant tout une rigidité élevée, afin de pouvoir manutentionner des décors de poids important, ou encore en aluminium si l'on cherche avant tout à avoir un dispositif léger et transportable.The motorized device 1 firstly comprises a three-dimensional and self-supporting horizontal beam 2, which delimits over its entire useful length a central space 6. In this case, the beam 2 is formed by horizontal members 3, which are connected between them by bars 4 and 5 ensuring bracing and bracing of this beam. The three-dimensional beam 2 here has a substantially rectangular section, but it goes without saying that a different shape can be chosen, for example a triangular section defined by three horizontal members. The three-dimensional and self-supporting beam 2 can be made of steel if one seeks above all a high rigidity, in order to be able to handle decorations of significant weight, or aluminum if one seeks above all to have a device light and transportable.

Le dispositif motorisé 1 comporte en outre un ensemble moto-réducteur 8 monté à une extrémité de la poutre, et dont l'arbre de sortie est accouplé à un arbre de transmission 18 s'étendant horizontalement dans l'espace central 6 de la poutre tridimensionnelle 2. L'ensemble moto-réducteur 8 sera de préférence un moto-réducteur frein à fonctionnement électrique et à limiteur de couple incorporé. Sur la figure 1, on a représenté une intégration totale de l'ensemble moto-réducteur 8 dans le volume de la poutre 2, c'est-à-dire que ce moto-réducteur est entièrement logé dans l'espace central 6 de ladite poutre, ce qui diminue considérablement l'encombrement et facilite la mise en place. L'ensemble moto-réducteur 8 sera par exemple boulonné sur une plaque entretoise 7 soudée aux membrures 3 et il sera raccordé par des câbles tels que le câble 1O à un bloc de commande associé 9 agencé en bout de la poutre tridimensionnelle 2, ledit bloc étant par exemple fixé sur une plaque entretoise 11. On a également représenté sur la figure 1, un moyen de commande à distance relié à ce bloc de commande 9, sous la forme d'un boîtier de commande 12 monté en extrémité d'un câble de liaison 13, et comportant deux boutons 14 et 15 permettant respectivement de commander la montée ou la descente de la barre porteuse 5O en faisant tourner l'arbre de sortie du moto-réducteur frein, et l'arbre de transmission qui lui est accouplé, dans un sens ou dans l'autre. La barre porteuse 5O est suspendue par des chaînes 21 dont l'extrémité inférieure est fixée sur cette barre au moyen d'un émerillon associé 22. Ces tronçons de chaîne 21 sont naturellement entraînés par l'arbre de transmission 18, ainsi que cela va être expliqué plus en détail ci-après, en référence aux figures 2 à 4.The motorized device 1 further comprises a geared motor assembly 8 mounted at one end of the beam, and the output shaft of which is coupled to a transmission shaft 18 extending horizontally in the central space 6 of the three-dimensional beam 2. The motor-reducer assembly 8 will preferably be an electrically operated motor-brake reducer with incorporated torque limiter. In Figure 1, a total integration of the geared motor assembly 8 is shown in the volume of the beam 2, that is to say that this geared motor is entirely housed in the central space 6 of said beam, which considerably reduces the overall dimensions and facilitates installation. The geared motor assembly 8 will for example be bolted to a spacer plate 7 welded to the members 3 and it will be connected by cables such as the cable 10 to an associated control block 9 arranged at the end of the three-dimensional beam 2, said block being for example fixed on a spacer plate 11. Also shown in Figure 1, a remote control means connected to this control unit 9, in the form of a control box 12 mounted at the end of a cable of connection 13, and comprising two buttons 14 and 15 respectively making it possible to control the raising or lowering of the carrier bar 50 by rotating the output shaft of the brake gear motor, and the transmission shaft which is coupled to it, one way or the other. The carrier bar 5O is suspended by chains 21, the lower end of which is fixed to this bar by means of an associated swivel 22. These chain sections 21 are naturally driven by the transmission shaft 18, as will be explained in more detail below, with reference to Figures 2 to 4.

Sur la figure 2, on retrouve la poutre tridimensionnelle et auto-portante 2 précédemment décrite, et l'on distingue, à l'extrémité de cette poutre qui est opposée à celle recevant le moto-réducteur frein 8, une plaque entretoise terminale 19 fixée aux quatres membrures 3. On distingue sur la figure 2, l'arbre de sortie 16 du moto-réducteur frein à limiteur de couple incorporé 8, et l'arbre de transmission 18 est ici accouplé directement en bout de cet arbre de sortie 16 au moyen d'un accouplement 17 de type conventionnel. Un tel mode d'accouplement directement en bout offre l'avantage d'une transmission directe du couple moteur, sans passer par des pignons intermédiaires, et confère une robustesse très satisfaisante.In FIG. 2, we find the three-dimensional and self-supporting beam 2 previously described, and we can see, at the end of this beam which is opposite to that receiving the brake gear motor 8, an end spacer plate 19 fixed to the four members 3. In FIG. 2, there is a distinction between the output shaft 16 of the brake gear motor with incorporated torque limiter 8, and the shaft transmission 18 is here directly coupled to the end of this output shaft 16 by means of a coupling 17 of conventional type. Such a direct end coupling mode offers the advantage of direct transmission of the engine torque, without passing through intermediate pinions, and gives a very satisfactory robustness.

Le dispositif motorisé 1 comporte une succession de moyens d'accrochage 2O servant à suspendre la barre porteuse 5O tout en pouvant faire varier la hauteur de celle-ci. Conformément à une caractéristique essentielle de l'invention, chaque moyen d'accrochage 2O se compose d'une noix de chaîne montée coaxialement sur l'arbre de transmission 18 et entraînée en rotation par celui-ci, et d'un tronçon de chaîne 21 passant sur cette noix de chaîne, ledit tronçon étant formé, quelle que soit la hauteur de la barre porteuse 5O, d'un brin vertical dont l'extrémité libre est accrochée sur la barre porteuse et d'un brin mort reçu dans un réceptacle associé 24.The motorized device 1 comprises a succession of attachment means 2O serving to suspend the carrier bar 5O while being able to vary the height thereof. In accordance with an essential characteristic of the invention, each hooking means 2O consists of a chain nut mounted coaxially on the transmission shaft 18 and rotated by it, and of a chain section 21 passing over this chain nut, said section being formed, whatever the height of the carrier bar 50, of a vertical strand whose free end is hooked on the carrier bar and of a dead strand received in an associated receptacle 24.

L'arbre de transmission 18 peut être d'une seule pièce sur toute la longueur de la poutre tridimensionnelle 2, ou encore, comme cela a été représenté ici, réalisé en une pluralité de tronçons successifs qui se raccordent entre eux au niveau de boîtiers 23 qui sont fixés à la poutre 2, en étant de préférence suspendus à l'intérieur de celle-ci. Un tel mode de réalisation confère une grande souplesse, dans la mesure où il est possible d'adapter la longueur de la poutre à l'environnement concerné, ou encore de transformer la longueur de cette poutre lorsque l'on souhaite démonter le dispositif pour l'implanter dans une autre salle. En effet, il suffit par exemple de démonter un tronçon de la poutre et le tronçon correspondant de l'arbre de transmission, ce qui permet immédiatement de réduire d'autant la longueur de la poutre. D'une façon générale, ainsi que cela est visible sur la figure 2, la longueur de la poutre sera légèrement supérieure à celle de la barre porteuse 5O. On distingue encore sur la figure 2, un capteur 25 fixé sur le boîtier 23 qui est le plus près du moto-réducteur 8, ce capteur de proximité (par exemple de type inductif) permettant de détecter la présence de l'émerillon de la chaîne, ou en variante d'une butée de fin de course montée sur la chaîne au-dessus de cet émérillon, lorsque la barre porteuse est remontée à la hauteur maximale désirée. Ce capteur de proximité est naturellement relié directement à l'alimentation du moto-réducteur 8. Il est à noter qu'en cas de dépassement de la course initiale ou de dysfonctionnement de ce capteur de proximité, on aurait un patinage de l'ensemble motorisé grâce au limiteur de couple incorporé au moto-réducteur frein 8. Il sera également prévu une autre butée de chaîne montée sur l'autre brin de chaîne (qui est reçu dans le réceptacle précité), cette seconde butée servant à limiter le niveau bas de la barre suspendue, par coopération soit avec le bord inférieur du boîtier 23 associé, soit avec un capteur de proximité associé. Pour la chaîne des autres boîtiers, on prévoira de préférence aussi des butées de chaîne, mais la fonction assurée par ces butées sera alors d'éviter que la chaîne ne s'échappe malencontreusement lors de l'installation du dispositif.The transmission shaft 18 may be in one piece over the entire length of the three-dimensional beam 2, or alternatively, as has been shown here, produced in a plurality of successive sections which are connected together at the level of housings 23 which are fixed to the beam 2, preferably being suspended inside the latter. Such an embodiment confers great flexibility, insofar as it is possible to adapt the length of the beam to the environment concerned, or even to transform the length of this beam when it is desired to dismantle the device for the '' set up in another room. Indeed, it suffices for example to disassemble a section of the beam and the corresponding section of the drive shaft, which immediately makes it possible to reduce the length of the beam accordingly. In general, as can be seen in Figure 2, the length of the beam will be slightly greater than that of the carrier bar 50. We can still see in Figure 2, a sensor 25 fixed on the housing 23 which is closest to the gear motor 8, this proximity sensor (for example of the inductive type) making it possible to detect the presence of the swivel of the chain , or as a variant of an end of travel stop mounted on the chain above this swivel, when the carrier bar is raised to the maximum desired height. This proximity sensor is naturally connected directly to the power supply of the gear motor 8. It should be noted that if the initial travel is exceeded or if this proximity sensor malfunctions, the motorized assembly will slip. thanks to the torque limiter incorporated in the brake gear motor 8. Another chain stopper mounted on the other chain strand (which is received in the aforementioned receptacle) will also be provided, this second stop being used to limit the low level of the suspended bar, by cooperation either with the lower edge of the associated housing 23, or with an associated proximity sensor. For the chain of the other boxes, provision will also preferably be made for chain stops, but the function provided by these stops will then be to prevent the chain from accidentally escaping during installation of the device.

L'implantation de la noix de chaîne associée à chaque boîtier 23 sera mieux comprise en se référant aux figures 3 et 4.The location of the chain nut associated with each box 23 will be better understood by referring to FIGS. 3 and 4.

Sur la figure 3, on constate que l'arbre de transmission 18 est interrompu au niveau du boîtier 23, la liaison d'accouplement entre les tronçons adjacents étant assurée par un arbre cannelé 28 traversant ce boîtier, arbre cannelé dont les deux extrémités sont reçues dans des embouts d'arbre cannelés 27 montés en extrémité des tronçons adjacents de l'arbre de transmission 18. Sur cet arbre cannelé 28 est enfilée directement la noix de chaîne associée, notée 29, qui tourillonne à l'intérieur du boîtier 23 grâce à la présence de roulements à billes associés 30. Le boîtier 23 est fixé à la poutre 2, en étant de préférence suspendu à l'intérieur de celle-ci de façon à préserver l'intégration des composants dans le volume intérieur de la poutre tridimensionnelle. En l'espèce, bien que cela ne soit aucunement obligatoire, le boîtier 23 est réalisé en deux demi-coquilles complémentaires 23.1, 23.2, dont le plan de joint Z coïncide avec le plan vertical de symétrie de la noix de chaîne 29, ledit boîtier étant suspendu à la poutre 2 par une tôle centrale 31 précisément agencée au niveau de ce plan de joint. La tôle 31 est ainsi serrée entre les deux demi-coquilles complémentaires 23.1, 23.2, qui sont boulonnées ensembles, la partie dépassante de la tôle centrale 31 servant alors à assurer la fixation sur la ou les entretoises concernées 4 de la poutre tridimensionnelle 2. En l'espèce, on a représenté une fixation réalisée par un serrage de la tôle centrale 31 entre deux entretoises 4 raccordées par des boulons associés 32, avec interposition de rondelles élastiques 33. Un tel agencement est particulièrement intéressant en l'espèce, car il permet de définir une suspension du boîtier 23 de type pendulaire, avec un débattement dans la direction de l'arbre de transmission 18 noté X. Cette suspension de type pendulaire de chacun des boîtiers 23 permet un auto-alignement des différents tronçons d'arbre de transmission.In FIG. 3, it can be seen that the transmission shaft 18 is interrupted at the level of the housing 23, the coupling connection between the adjacent sections being ensured by a splined shaft 28 passing through this housing, splined shaft, the two ends of which are received in splined shaft end pieces 27 mounted at the end of the adjacent sections of the transmission shaft 18. On this splined shaft 28 is directly threaded the associated chain nut, denoted 29, which rotates at the inside of the housing 23 thanks to the presence of associated ball bearings 30. The housing 23 is fixed to the beam 2, preferably being suspended inside the latter so as to preserve the integration of the components in the interior volume of the three-dimensional beam. In this case, although this is in no way compulsory, the housing 23 is produced in two complementary half-shells 23.1, 23.2, the joint plane Z of which coincides with the vertical plane of symmetry of the chain nut 29, said housing being suspended from the beam 2 by a central plate 31 precisely arranged at this joint plane. The sheet metal 31 is thus clamped between the two complementary half-shells 23.1, 23.2, which are bolted together, the projecting part of the central sheet metal 31 then serving to secure the three-dimensional beam 2 on the spacer (s) concerned. in this case, a fixing is shown produced by tightening the central sheet 31 between two spacers 4 connected by associated bolts 32, with the interposition of elastic washers 33. Such an arrangement is particularly advantageous in this case, because it allows to define a suspension of the pendulum type housing 23, with a clearance in the direction of the transmission shaft 18 denoted X. This pendulum type suspension of each of the housings 23 allows self-alignment of the different sections of transmission shaft .

La noix de chaîne 29 est parfaitement protégée à l'intérieur de son boîtier 23, et, ainsi que cela est mieux visible sur la figure 4, ce boîtier présente deux passages verticaux 34, de section cruciforme, pour la passage des deux brins du tronçon de chaîne concerné. Sur la figure 4, on distingue bien le tronçon de chaîne 21 passant sur la noix de chaîne 29, lequel tronçon est formé, quelle que soit la hauteur de la barre porteuse 5O, d'un brin vertical 21.1 dont l'extrémité libre est accrochée sur la barre porteuse 5O par l'émerillon 22, et d'un brin mort 21.2 qui est reçu dans un réceptacle associé 24 fixé à la poutre 2. En l'espèce, l'accrochage sur la barre porteuse 5O est assuré par les douilles 53 traversant verticalement cette barre, et soudées à celle-ci, dans lesquelles passe la tige filetée 55 d'un boulon, serrée par des écrous 54, et dont la tête est reçue à l'intérieur de l'émerillon 22. Le réceptacle de chaîne 24 est par exemple fixé par une bande métallique 37 à la poutre 2, et il sera réalisé en une matière souple, par exemple de la toile plastifiée résistante. De cette façon, lors de la remontée de la barre porteuse, le brin mort 21.2 de chaque tronçon de chaîne 21 est reçu progressivement dans son réceptacle associé 24.The chain nut 29 is perfectly protected inside its housing 23, and, as can be seen more clearly in FIG. 4, this housing has two vertical passages 34, of cruciform cross section, for the passage of the two strands of the chain section concerned. In FIG. 4, a clear distinction is made between the chain section 21 passing over the chain nut 29, which section is formed, whatever the height of the load-bearing bar 50, of a vertical strand 21.1 whose free end is hooked on the carrier bar 5O by the swivel 22, and a dead strand 21.2 which is received in an associated receptacle 24 fixed to the beam 2. In this case, the attachment to the carrier bar 5O is ensured by the sockets 53 vertically passing through this bar, and welded thereto, through which passes the threaded rod 55 of a bolt, tightened by nuts 54, and the head of which is received inside the swivel 22. The receptacle of chain 24 is for example fixed by a metal strip 37 to the beam 2, and it will be made of a flexible material, for example resistant plasticized canvas. In this way, when the carrier bar is raised, the dead strand 21.2 of each chain section 21 is gradually received in its associated receptacle 24.

On distingue également un bord inférieur d'appui 35 du boîtier 23, défini par le bord inférieur de chacune des deux demi-coquilles constitutives 23.1, 23.2, lequel bord coopère avec une butée de chaîne 26 fixée par un boulon associé 36 en cas de descente maximale de la barre porteuse 50. Pour la remontée maximale de cette barre porteuse, on peut utiliser un capteur de proximité du type précédemment décrit, ou encore prévoir une butée de chaîne sur le brin d'accrochage 21.1 qui coopère alors avec le bord inférieur d'appui 35 lorsque la position haute maximale de la barre porteuse 50 est atteinte.There is also a lower support edge 35 of the housing 23, defined by the lower edge of each of the two constituent half-shells 23.1, 23.2, which edge cooperates with a chain stopper 26 fixed by an associated bolt 36 in the event of descent. maximum of the carrying bar 50. For the maximum raising of this carrying bar, one can use a proximity sensor of the type previously described, or even provide a chain stop on the hooking strand 21.1 which then cooperates with the lower edge d 'support 35 when the maximum high position of the support bar 50 is reached.

Le dispositif selon l'invention procure un très grand nombre d'avantages, dont les plus importants vont être notés ci-après.The device according to the invention provides a very large number of advantages, the most important of which will be noted below.

La poutre tridimensionnelle et auto-portante 2 est tout d'abord à la fois peu encombrante, et l'intégration des divers composants du dispositif motorisé, et en particulier le moto-réducteur frein à limiteur de couple incorporé, ne vient aucunement interférer avec la compacité d'ensemble.The three-dimensional and self-supporting beam 2 is first of all both compact, and the integration of the various components of the motorized device, and in in particular, the brake gear motor with incorporated torque limiter does not interfere with the overall compactness.

Il va de soi que la poutre horizontale tridimensionnelle 2 pourra en variante faire partie d'une structure porteuse plus complexe, en forme de U, de T, ou encore de L. On pourra dans le cas de telles variantes prévoir de disposer l'ensemble de moto-réducteur à un autre emplacement de la structure en U, en T, ou en L, plutôt qu'en extrémité de la poutre horizontale à laquelle est suspendue la barre porteuse. Dans ce cas, il suffira d'utiliser des renvois d'angle pour transmettre le mouvement de rotation à l'arbre de transmission s'étendant horizontalement dans l'espace central de la poutre tridimensionnelle auto-portante 2.It goes without saying that the three-dimensional horizontal beam 2 may alternatively be part of a more complex bearing structure, in the form of a U, a T, or even an L. In the case of such variants, provision may be made to arrange the assembly motor-reducer at another location in the U, T, or L structure, rather than at the end of the horizontal beam from which the carrier bar is suspended. In this case, it will suffice to use angle references to transmit the rotational movement to the transmission shaft extending horizontally in the central space of the three-dimensional self-supporting beam 2.

Le fait d'utiliser des tronçons de chaîne, et des petits diamètres conférés par les noix de chaîne associées, permet d'avoir un couple de levage à la fois constant et élevé, ainsi qu'une vitesse constante (tout en pouvant naturellement être modifiée grâce à un dispositif électronique approprié, tel qu'un variateur de fréquence agissant sur le moteur) de déplacement de la barre porteuse, tant pour sa remontée que pour sa descente.The fact of using chain sections, and small diameters imparted by the associated chain nuts, makes it possible to have a lifting torque that is both constant and high, as well as a constant speed (while naturally being able to be modified thanks to an appropriate electronic device, such as a frequency converter acting on the motor) for moving the carrier bar, both for its ascent and its descent.

Cette suspension par chaîne est également avantageuse dans la mesure où il suffit de changer la longueur des tronçons de chaîne pour s'adapter à une hauteur différente de suspension de la barre porteuse. Il convient alors de noter que, quelle que soit la hauteur de levage de la barre porteuse, la section de la poutre reste la même. Les tronçons de chaîne étant de toute façon de même longueur, ces chaînes n'entraînent aucune différence de niveau de la barre porteuse, et ce quelle que soit la hauteur de celle-ci, ce qui garantit en permanence une parfaite horizontalité de cette barre porteuse.This chain suspension is also advantageous insofar as it suffices to change the length of the chain sections to adapt to a different suspension height of the support bar. It should then be noted that, whatever the lifting height of the support bar, the section of the beam remains the same. The chain sections being in any case of the same length, these chains do not cause any difference in level of the load-bearing bar, and whatever the height thereof, which permanently guarantees perfect horizontality of this load-bearing bar .

Aucun emmêlement n'est à craindre par rapport aux systèmes à câbles ou à sangles, même si une charge est accrochée ponctuellement à l'endroit d'une seule chaîne. Ceci permet donc de supprimer tout réglage de remise à niveau de la barre porteuse, lequel réglage était par exemple indispensable avec les systèmes connus à sangles.No tangling is to be feared compared to cable or strap systems, even if a load is temporarily attached to a single chain. This therefore makes it possible to eliminate any adjustment of leveling of the support bar, which adjustment was for example essential with the known systems with straps.

Après le décrochage de la barre porteuse, les tronçons de chaîne peuvent totalement disparaître dans les fourreaux d'un faux plafond. Il est également possible de diriger un ou plusieurs tronçons de chaînes dans un réceptacle, pour utilisation d'un seul tronçon de chaîne du dispositif, ce qui permet par exemple d'adapter le dispositif de l'invention au levage d'un ensemble particulier tel qu'un lustre.After the lifting of the load-bearing bar, the chain sections can completely disappear in the sleeves of a false ceiling. It is also possible to direct one or more sections of chains in a receptacle, for use of a single section of chain of the device, which allows for example to adapt the device of the invention to the lifting of a particular assembly such than a chandelier.

Ainsi que cela a été dit plus haut, l'agencement de la poutre tridimensionnelle et auto-portante, avec son arbre de transmission intérieur réalisé en plusieurs tronçons mis bout à bout, permet d'obtenir une longueur variable, ce qui confère une grande souplesse d'installation.As mentioned above, the arrangement of the three-dimensional, self-supporting beam, with its internal drive shaft made up of several sections placed end to end, makes it possible to obtain a variable length, which gives great flexibility. of installation.

La rigidité conférée par la poutre tridimensionnelle et auto-portante réduit considérablement le nombre de suspensions pour la fixation dans les cintres ou les charpentes de la salle, et évite la mise en place de structures primaires coûteuses et encombrantes.The rigidity conferred by the three-dimensional and self-supporting beam considerably reduces the number of suspensions for fixing in the hangers or frames of the room, and avoids the establishment of expensive and bulky primary structures.

Il est par ailleurs possible de prévoir un déplacement du dispositif dans un plan horizontal, perpendiculairement à la direction principale de la poutre. On a ainsi représenté une telle variante sur la figure 2, sur laquelle on constate que la poutre 2 est elle-même suspendue par des galets ou roulettes 32, par exemple fixés en partie haute de tôles 31 serrées entre deux entretoises adjacentes 4, à des rails 33 suspendus par des tiges filetées 34, lesquels rails s'étendent perpendiculairement à la direction principale de la poutre, ce qui permet de déplacer le décor correspondant perpendiculairement à son plan. Un tel système est particulièrement intéressant lorsqu'un grand nombre de dispositifs sont accolés, c'est-à-dire pour de grandes salles de théâtre ou de concert.It is also possible to provide for a displacement of the device in a horizontal plane, perpendicular to the main direction of the beam. Such a variant has thus been represented in FIG. 2, in which it can be seen that the beam 2 is itself suspended by rollers or rollers 32, for example fixed at the top of sheets 31 clamped between two adjacent spacers 4, at rails 33 suspended by threaded rods 34, which rails extend perpendicular to the main direction of the beam, which makes it possible to move the corresponding decoration perpendicular to its plan. Such a system is particularly advantageous when a large number of devices are placed side by side, that is to say for large theaters or concert halls.

On va maintenant décrire une variante de réalisation du dispositif qui vient d'être décrit, en se référant aux figures 5 à 9. Dans cette variante, on retrouve un grand nombre d'organes déjà décrits, lesquels sont affectés des mêmes références et ne seront pas à nouveau décrits.We will now describe an alternative embodiment of the device which has just been described, with reference to Figures 5 to 9. In this variant, there are a large number of organs already described, which are given the same references and will not be not described again.

Le dispositif illustré aux figures 5 à 9 est tout d'abord remarquable en ce que la poutre 2 est réalisée sous la forme de tronçons mis bout à bout (ici au nombre de deux), dont un premier tronçon 2.1 incorporant l'ensemble moto-réducteur 8 avec son bloc de commande 9 et un boîtier 23, et au moins un (ici un) tronçon supplémentaire 2.2 incorporant un ou deux boîtiers 23. Ceci permet d'avoir un tronçon "motorisé" qui est aisément portable et maniable, dont la longueur est par exemple de 1,30 m ou 1,80 m.The device illustrated in FIGS. 5 to 9 is first of all remarkable in that the beam 2 is produced in the form of sections placed end to end (here two in number), including a first section 2.1 incorporating the motor assembly reduction gear 8 with its control unit 9 and a housing 23, and at least one (here) an additional section 2.2 incorporating one or two housings 23. This makes it possible to have a "motorized" section which is easily portable and handy, the length is for example 1.30 m or 1.80 m.

Par ailleurs, le dispositif 1 se différencie du précédent par le mode d'accrochage des boîtiers suspendus à la poutre, et par le mode d'exécution du réceptacle de chaîne associé.Furthermore, the device 1 differs from the previous one by the method of attachment of the boxes suspended from the beam, and by the embodiment of the associated chain receptacle.

On constate ainsi la présence, au niveau de chaque boîtier 23, d'un étrier en U 6O soudé à la poutre 2, dont les ailes 61 permettent d'enfiler deux goujons lisses 62 munis à leurs extrémités de gorges 64 associées à une bague de verrouillage. En l'espèce, chaque demi-coquille 23.1, 23.2 formant le boîtier 23, ainsi que la tôle centrale 31 agencée au niveau du plan de joint, est accrochée sur ces goujons 62. Cependant les demi-coquilles sont garnies d'un manchon élastique respectif 63.1, 63.2, autorisant un léger débattement pendulaire pour le boîtier. On obtient ainsi une suspension à la fois robuste et souple. En outre, les deux demi-coquilles 23.1, 23.2 supportent inférieurement un carter 65, fixé par des boulons 66, en partie inférieure duquel est accroché le réceptacle de chaîne 24. Le carter 65 présente, pour le passage du brin frontal 21.1, un renfoncement 67. Le réceptacle est ainsi fixé, au niveau d'un bord formant ceinture 37, au carter 65, lequel est de préférence en appui par un bord inférieur 75 sur une membrure horizontale 3 de la poutre 2, de façon à mieux supporter le poids de la chaîne en position haute de la barre porteuse 5O.There is thus the presence, at each housing 23, of a U-shaped bracket 6O welded to the beam 2, the wings 61 of which allow two smooth studs 62 to be threaded provided at their ends with grooves 64 associated with a ring of locking. In this case, each half-shell 23.1, 23.2 forming the housing 23, as well as the central sheet 31 arranged at the joint plane, is hung on these studs 62. However the half-shells are furnished with an elastic sleeve respective 63.1, 63.2, allowing a slight pendulum clearance for the housing. This results in a suspension that is both robust and flexible. In addition, the two half-shells 23.1, 23.2 support below a casing 65, fixed by bolts 66, in the lower part of which is hung the chain receptacle 24. The housing 65 has, for the passage of the front strand 21.1, a recess 67. The receptacle is thus fixed, at an edge forming a belt 37, to the housing 65, which is preferably supported by a lower edge 75 on a horizontal frame 3 of the beam 2, so as to better support the weight of the chain in the high position of the load-bearing bar 50.

Sur la figure 9, on a en outre illustré un équipement qui sera de préférence prévu sur le premier boîtier du tronçon motorisé. La tôle centrale 31 présente deux oreilles 31.1 et 31.2 saillant du boîtier, servant à accrocher sur chacune un capteur 68.1, 68.2 présentant un bouton de contact 69.1, 69.2 tourné vers le bas. Un bloc 71 solidaire du boîtier 23 porte en outre une double plaquette 70.1, 70.2 munie d'une ouverture respective 72.1, 72.2 pour le passage de la chaîne 21. Des butées de chaîne 26.1, 26.2 coopèrent avec ces capteurs, ici par l'intermédiaire de la plaquette fléchissante 70.1, 70.2, respectivement en position haute et en position basse de la barre porteuse 50.In FIG. 9, equipment has also been illustrated which will preferably be provided on the first housing of the motorized section. The central plate 31 has two ears 31.1 and 31.2 projecting from the housing, serving to hang on each a sensor 68.1, 68.2 having a contact button 69.1, 69.2 turned downwards. A block 71 secured to the housing 23 further carries a double plate 70.1, 70.2 provided with a respective opening 72.1, 72.2 for the passage of the chain 21. Chain stops 26.1, 26.2 cooperate with these sensors, here via of the flexing plate 70.1, 70.2, respectively in the high position and in the low position of the support bar 50.

Les capteurs 68.1, 68.2 permettent, lorsqu'ils sont actionnés par la butée de chaîne associée 26.1, 26.2, de commander la coupure du moteur d'entraînement ou du bloc de commande associé, ce qui constitue une sécurité très fiable.The sensors 68.1, 68.2 allow, when actuated by the associated chain stopper 26.1, 26.2, to control the shutdown of the associated drive motor or control block, which constitutes very reliable safety.

L'invention n'est pas limitée au mode de réalisation qui vient d'être décrit, mais englobe au contraire toute variante reprenant, avec des moyens équivalents, les caractéristiques essentielles énoncées plus haut, dans les limites fixées par les revendications.The invention is not limited to the embodiment which has just been described, but on the contrary encompasses any variant incorporating, with equivalent means, the essential characteristics stated above, within the limits set by the claims.

Claims (15)

  1. Motorised apparatus for handling hanging scenery sets or the like which are hooked on a horizontal carrier bar, characterised in that it comprises:
    - a horizontal three-dimensional self-supporting beam (2) defining over its entire useful length a central space (6);
    - a motor-reducing assembly (8) mounted at one end of the beam and of which the output shaft (17) is coupled to a transmission shaft (18) extending horizontally in said central space;
    - a succession of hooking means (20) for suspending the carrier bar (50) while being capable of varying the height thereof, each hooking means (20) comprising a chain sprocket (29) mounted coaxially on the transmission shaft (18) and driven in rotation thereby and a chain portion (21) passing over the chain sprocket (29), said chain portion being formed, irrespective of the height of the carrier bar (50), by a vertical run (21.1) of which the free end is hooked on the carrier bar (50) and a dead run (21.2) received in an associated receptacle (24).
  2. Apparatus according to claim 1 characterised in that the beam (2) is stiffened and cross-braced and its length is slightly greater than that of the carrier bar (50).
  3. Apparatus according to claim 1 or claim 2 characterised in that the motor-reducing assembly (8) is an electrically operated brake motor-reducing unit with incorporated torque limiter, the brake motor-reducing unit being accommodated in the central space (6) of the beam (2) so as to be integrated into the volume thereof.
  4. Apparatus according to claim 3 characterised in that the transmission shaft (18) is coupled directly at the end of the output shaft (16) of the brake motor-reducing unit (8).
  5. Apparatus according to one of claims 1 to 4 characterised in that each hooking means (20) comprises a housing (23) in which the associated chain sprocket (29) is journalled, said housing being fixed to the beam (2), preferably being suspended in the interior thereof.
  6. Apparatus according to claim 5 characterised in that the housing (23) is made in the form of two complementary half-shell portions (23.1, 23.2), the joining plane (Z) of which coincides with the vertical plane of symmetry of the chain sprocket (29).
  7. Apparatus according to claim 6 characterised in that the housing (23) is suspended from the beam (2) by a central plate (31) arranged at the level of the joining plane (Z) and the fixing of said central plate (31) is of pendulum type, with movement in the direction of the transmission shaft (18).
  8. Apparatus according to claim 6 characterised in that the housing (23) is suspended by way of resilient means (63.1, 63.2) from a stirrup (60) which is fixed with respect to the beam (2) and from which a central plate (31) arranged at the level of the joining plane (Z) is also suspended.
  9. Apparatus according to one of claims 6 to 8 characterised in that the two half-shell portions (23.1, 23.2) forming the housing (23) define a lower support edge (35) with which there co-operates one or other of two chain abutments (26.1, 26.2) serving to define the range of variation in the lifting height of the carrier bar (50).
  10. Apparatus according to one of claims 6 to 8 characterised in that the housing (23) or the central plate (31) which is associated therewith carries two sensors (68.1, 68.2) with which there co-operates, directly or by way of a yielding plate portion (70.1, 70.2) which is fixed with respect to said housing, one or other of two chain abutments (26.1, 26.2) serving to define the range of variation in the lifting height of the carrier bar (50).
  11. Apparatus according to one of claims 6 to 10 characterised in that the two half-shell portions (23.1, 23.2) forming the housing (23) support in the lower portion thereof a casing (65) on to which the chain receptacle (24) is hooked.
  12. Apparatus according to claim 11 characterised in that the casing (65) is supported by a lower edge (75) on a horizontal member (3) of the beam (2).
  13. Apparatus according to one of claims 5 to 12 characterised in that the transmission shaft (18) is interrupted at the location of each housing (23), the coupling connection between the adjacent portions being afforded by a splined shaft (28) passing through the housing (23), the associated chain sprocket (29) being fitted directly on to said splined shaft (28).
  14. Apparatus according to claim 13 characterised in that the beam (2) is constructed in the form of portions which are disposed end-to-end, including a first portion (2.1) incorporating the motor-reducing assembly (8) and a first housing (13) and at least one supplementary portion (2.2) incorporating one or two housings (13).
  15. Apparatus according to one of claims 1 to 14 characterised in that the beam (2) is itself suspended by rollers or wheels (32) from rails (33) which extend perpendicularly to the main direction of said beam so as to be capable of displacing the suspended scenery set or equipment perpendicularly to its plane.
EP95400450A 1994-03-08 1995-03-02 Motorized lifting device for hanging sceneries or the like Expired - Lifetime EP0671195B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9402647A FR2717097B1 (en) 1994-03-08 1994-03-08 Motorized device for handling suspended decorations or the like.
FR9402647 1994-03-08

Publications (2)

Publication Number Publication Date
EP0671195A1 EP0671195A1 (en) 1995-09-13
EP0671195B1 true EP0671195B1 (en) 1997-06-11

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Application Number Title Priority Date Filing Date
EP95400450A Expired - Lifetime EP0671195B1 (en) 1994-03-08 1995-03-02 Motorized lifting device for hanging sceneries or the like

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EP (1) EP0671195B1 (en)
AT (1) ATE154253T1 (en)
DE (1) DE69500338T2 (en)
FR (1) FR2717097B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19819262A1 (en) * 1998-04-30 1999-11-11 Trenomat Gmbh & Co Kg Partition curtain, in particular a highly retractable partition curtain for sports halls, event and trade fair halls, industrial halls, halls or the like.
FR2842120B1 (en) * 2002-07-12 2004-10-01 Baudin Chateauneuf DECOR LIFT WINCH SYSTEM FOR SHOW ROOM AND ESPECIALLY THEATER
NL1021354C2 (en) 2002-08-29 2004-03-02 Prolyte Vastgoed B V Pulling device and pulling element.
JP5357623B2 (en) * 2009-05-13 2013-12-04 カヤバ システム マシナリー株式会社 Single letter curtain and sleeve curtain storage structure
FR3005218A1 (en) * 2013-04-30 2014-10-31 Mecascenic MOTORIZED DEVICE FOR HANDLING SUSPENDED ELEMENTS
CN105129333A (en) * 2015-07-20 2015-12-09 安徽无为冠雄建材机械有限公司 Head transmission system of embedded scraper conveyer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722143C3 (en) * 1977-05-16 1981-10-15 Bühnenbau Rolf Schnakenberg GmbH & Co KG, 5600 Wuppertal Pull-up curtain for theater stages, sports halls or the like.
DE3016079A1 (en) * 1980-04-25 1981-10-29 Pierre Gagnon POST ROD LIFTING SYSTEM FOR STAGE

Also Published As

Publication number Publication date
EP0671195A1 (en) 1995-09-13
FR2717097B1 (en) 1996-05-31
FR2717097A1 (en) 1995-09-15
ATE154253T1 (en) 1997-06-15
DE69500338D1 (en) 1997-07-17
DE69500338T2 (en) 1998-01-08

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