EP0796815A1 - Hoisting device - Google Patents

Hoisting device Download PDF

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Publication number
EP0796815A1
EP0796815A1 EP96810170A EP96810170A EP0796815A1 EP 0796815 A1 EP0796815 A1 EP 0796815A1 EP 96810170 A EP96810170 A EP 96810170A EP 96810170 A EP96810170 A EP 96810170A EP 0796815 A1 EP0796815 A1 EP 0796815A1
Authority
EP
European Patent Office
Prior art keywords
pallet
frame
load
rotated
endless
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.)
Withdrawn
Application number
EP96810170A
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German (de)
French (fr)
Inventor
Jean Cestonaro
Jean-Luc Mathon
Pascal Christen
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.)
Philip Morris Products SA
Original Assignee
Fabriques de Tabac Reunies SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fabriques de Tabac Reunies SA filed Critical Fabriques de Tabac Reunies SA
Priority to DE29623493U priority Critical patent/DE29623493U1/en
Priority to EP96810170A priority patent/EP0796815A1/en
Publication of EP0796815A1 publication Critical patent/EP0796815A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars

Definitions

  • the present invention relates to a lifting device, particularly well suited for lifting a pallet.
  • a known device for this purpose uses cables, one end of each of them being connected to a corner of a pallet holder, the other ends of said cables being connected together to a movement actuator like the piston of a jack. . Since said cylinder is located on a lateral or front face of the device in order to limit its size, the length of the cables connecting it to the corners of the pallet is not uniform and there are two cables longer than the other two. The different length of one pair of cables compared to the other is a major drawback when the cables are loaded, the elongation of the longest cables being greater than that of the shorter cables, due to the relation of the module d elasticity (Young's modulus).
  • An object of the invention is therefore to propose a lifting device provided with lifting means which do not have the mentioned drawbacks of the devices of the prior art, that is to say ensuring that the pallet remains perfectly horizontal in any place of the lift stroke, preferably comprising a single motor means or else motor means which are easy to synchronize, the exposed areas of the lifting device being free of grease.
  • the lifting device 1 consists in particular of a frame 2 comprising in particular four vertical pillars 20,21,22,23, the lateral faces of the frame 2 preferably comprising upper connecting bars 24 connecting the tops of the pillars 20 and 23 thus as 21 and 22 as well as other lower connecting bars 25 connecting the lower ends of the same pillars, this to increase the rigidity of the frame.
  • Preferably at least one front face of the frame 2 has no connecting bar.
  • Frame 2 is fixed to the ground by suitable means.
  • the lifting means 3 of a pallet 4 consist of a plurality of toothed belts 30, distributed here in four sets of each three belts distributed near the four corners of the pallet 4; the belts 30 of each set being provided with a pallet gripping means 31, fixed to said belts 30, the four pallet gripping means 31 are all arranged at the same height.
  • Each set of belts 30 is stretched between two sets of toothed pulleys 32, 33, two sets of pulleys 32 being fixed to each of the upper connecting bars 24 and two other sets of toothed pulleys 33 being fixed in the same way and to the perpendicular to the sets of hens 32 at each of the lower connecting bars 25.
  • the axes of rotation of the pulleys 32 and 33 are mutually parallel and with the direction of the connecting bars 24,25.
  • the driving of the toothed pulleys 32, 33, respectively of the belts 30 is preferably obtained by means of two drive shafts 34, arranged parallel to the connecting bars 24 and driving the toothed pulleys 32 directly or by means of sets of gears 35.
  • the general drive of the lifting means 3 is obtained by the motor 39, preferably an electric motor, the output shaft of which is provided with a double toothed pulley driving two toothed belts 38, each of 'they driving one of said drive shafts 34 by means of a gearbox 36 comprising in particular an input pinion 37.
  • the rotating mechanical parts such as for example the gearboxes 35, 36 the shafts 34 or the like, are preferably covered with suitable cowlings.
  • the motor 39 is fixed to a frame 26 integral with two transverse bars 27 connected to the two pillars 22 and 23 forming the rear front face of the frame 2. Any other suitable place can also be provided to have it the motor 39.
  • the lifting device 1 is preferably provided with control means 5, shown diagrammatically in the figure by a control console 50 connected to the motor 39 for its supply.
  • One or more end-of-travel or position detectors 51 can also be provided in order to automatically determine the end of travel of the pallet 4 or a determined elevation position.
  • the control means 5, in particular the control console 50 may be specific to the lifting device or else, in the case where this device is intended to supply a production machine with a given product, it may be the control means for said machine which automatically controls the operation of the lifting device according to its own needs.
  • a loaded pallet 4 (the load not being shown in the figure) is brought by a front face preferably comprising no transverse connecting bar liable to interfere the passage of the pallet and its load.
  • the means for bringing the pallet 4 and depositing it on the gripping means 31 are known in the art, it may be a mobile forklift pallet carrier, a train of rollers penetrating into the frame 2 or any other suitable means. Or the stops 52 are then in position to imitate the advance movement of the pallet 4 in order to position it exactly on the gripping means 31.
  • the motor 39 can then be actuated in order to drive the shafts 34, the belts 30 , respectively raise the pallet 4 and its load, suspended from the gripping means 31. This elevation movement can be stopped either by manually triggering the supply of the motor 39, or by triggering this supply by one or more detectors 51, specific to the device 1 or forming a direct part of the production machine or its supply device.
  • the motor 39 is again actuated in order to lower the pallet; the motor control can be designed so that the speed of descent of the pallet is greater than its speed of ascent.
  • the empty pallet is in the lower position, it is possible to remove the stopper (s) 52, the empty pallet then being able to be pushed on rollers or slides (not shown) towards the rear face of the frame 2 by the full pallet in progress loading into the device, the empty pallet being eliminated by passing under the bar 27 serving to support the motor.
  • another stop means (not shown) can limit the displacement of the empty pallet, so that the advance of the full pallet in the device is limited by the empty pallet waiting to be eliminated.
  • the pallet 4 and its load is directly suspended from the toothed belts 30, the length under load of each belt being the same, they will all lengthen by the same value, thus retaining the pallet 4 and its horizontal load.
  • the cores of said belts are preferably furnished with reinforcements, formed of strands or cables of steel or of another material resistant to traction such as Kevlar. Belts thus armed are generally commercially available.
  • the embodiment of the lifting means 3 described here consists of four sets of three belts, any other number of sets consisting of any other number of belts can obviously be considered, the choice of the total number of belts and their grouping dependent essentially the maximum load to be raised with respect to the inherent resistance of each belt.
  • the drive shafts 34 have been described driving the toothed pulleys disposed at the upper part of each side face; this is an advantage insofar as the portion of each belt 30 tensioned under the effect of the load is limited; in the event that this constraint is not significant and where for reasons of arrangement of the machine this arrangement would not be adequate, it is also possible to drive the pulleys arranged at the bottom of the device.
  • the pallet gripping means 31 are interconnected by one or more transverse bars, not shown in the figure, in order to avoid the deflection of said means under load.
  • Another advantage of the device according to the invention is that it easily makes it possible to be adapted to loads of variable width, for example pallets or load plates of width greater than the standard width.
  • at least one of the lateral faces consisting for example of the pillars 21 and 22 as well as the connecting bars 24 and 25 can be moved laterally in order to leave a greater free interior width between the pillars 20 and 21, respectively 22 and 23; for this, the transverse bars 27 can be adjustable in length and in a vertical position in order to position the motor 39 so that the belts 38 remain tensioned.
  • each drive shaft 34 is driven by its own motor, two electric motors being relatively easy to synchronize.
  • the latter possibility of eliminating the cross bars 27 and the frame 26 completely frees the rear face of the frame 2, which can be advantageous in certain cases of machine arrangement. In the latter case, adequate means must be provided in order to maintain the rigidity of the device.
  • the lifting device described meets the set goal, the pallet remaining horizontal over its entire path, the motor means is simple to control, and the exposed parts of the lifting means, respectively the belts 30 do not need to be greased and can therefore work in a dust-laden atmosphere, the other sensitive parts of the device being able to be easily protected by covers.
  • the toothed belts 30 it is possible to replace the toothed belts 30 by roller chains.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Noodles (AREA)
  • Advancing Webs (AREA)

Abstract

The equipment is installed in a rectangular frame (2) with four uprights (20-23) at the corners interconnected pairwise by upper and lower horizontal bars (24,25). The supports (31) for the four corners of the pallet (4) are moved vertically by the endless toothed belts (30) to which they are secured. Each belt is driven by a pulley (32) rotated by a drive shaft (34) with gearing (36) from primary toothed belts (38) and a single electric motor (39). Since the vertically moving parts are all of equal length, the load remains horizontal on its pallet throughout the lift.

Description

La présente invention concerne un dispositif de levage, particulièrement bien adapté au levage d'une palette.The present invention relates to a lifting device, particularly well suited for lifting a pallet.

Un dispositif connu à cet effet utilise des câbles, une extrémité de chacun d'entre eux étant reliée à un coin d'un porte-palette, les autres extrémités desdits câbles étant reliées ensemble à un actionneur de mouvement comme le piston d'un vérin. Vu que ledit vérin se trouve sur une face latérale ou frontale du dispositif afin de limiter son encombrement, la longueur des câbles le reliant aux coins de la palette n'est pas uniforme et on a deux câbles plus longs que les deux autres. La longueur différente d'une paire de câbles par rapport à l'autre est un inconvénient majeur lorsque les câbles sont chargés, l'allongement des câbles les plus longs étant plus grand que celui des câbles plus courts, de par la relation du module d'élasticité (Module d'Young). Ceci a pour effet que lorsqu'une palette chargée est élevée, ladite palette n'est plus exactement horizontale en position élevée, ceci étant un inconvénient notamment dans le cas des dispositifs de levage devant amener automatiquement une charge déterminée, pouvant être variable, à une hauteur déterminée pour alimenter automatiquement ou non une machine de production.A known device for this purpose uses cables, one end of each of them being connected to a corner of a pallet holder, the other ends of said cables being connected together to a movement actuator like the piston of a jack. . Since said cylinder is located on a lateral or front face of the device in order to limit its size, the length of the cables connecting it to the corners of the pallet is not uniform and there are two cables longer than the other two. The different length of one pair of cables compared to the other is a major drawback when the cables are loaded, the elongation of the longest cables being greater than that of the shorter cables, due to the relation of the module d elasticity (Young's modulus). This has the effect that when a loaded pallet is high, said pallet is no longer exactly horizontal in the raised position, this being a drawback especially in the case of lifting devices which must automatically bring a determined load, which can be variable, to a height determined to automatically or not feed a production machine.

Cet inconvénient pourrait être surmonté en cherchant un système où les câbles sont de même longueur; dans ce cas il devient nécessaire d'avoir au moins deux actionneurs de mouvement disposés symétriquement; il devient alors nécessaire de synchroniser ces deux actionneurs ce qui n'est pas toujours aisé dans le cas de vérins. Dans tous les cas cette solution est plus coûteuse.This drawback could be overcome by looking for a system where the cables are the same length; in this case it becomes necessary to have at least two motion actuators arranged symmetrically; it then becomes necessary to synchronize these two actuators, which is not always easy in the case of jacks. In any case, this solution is more expensive.

Une autre solution consistant à enrouler les extrémités des câbles sur des tambours tournant en synchronisme n'est non plus pas aisée à mettre en action vu que le trancannage de chacun des câbles doit être exactement conduit afin que chacun s'enroule sur un même diamètre.Another solution consisting in winding the ends of the cables on drums rotating in synchronism is also not easy to put into action since the slicing of each of the cables must be exactly conducted so that each is wound on the same diameter.

Une autre possibilité consistant à disposer quatre vis sans fin aux coins du porte-palette ne peut être utilisée dans tous les cas; en particulier dans le cas d'une industrie produisant de la poussière, comme par exemple certaines zones de l'industrie du tabac, où la nécessité de graisser les vis devient un inconvénient puisque de la poussière vient régulièrement s'y coller, impliquant un entretien soigné afin de préserver les vis.Another possibility consisting in having four endless screws at the corners of the pallet holder cannot be used in all cases; in particular in the case of an industry producing dust, such as for example certain areas of the tobacco industry, where the need to grease the screws becomes a disadvantage since dust regularly sticks to it, implying careful maintenance in order to to preserve the screws.

Un but de l'invention est donc de proposer un dispositif élévateur muni de moyens de levage ne comportant pas les inconvénients mentionnés des dispositifs de l'art antérieur, c'est-à-dire assurant que la palette reste parfaitement horizontale en tout endroit de la course de l'élévateur, comportant de préférence un seul moyen moteur ou alors des moyens moteur faciles à synchroniser, les zones exposées du dispositif de levage étant exemptes de graisse.An object of the invention is therefore to propose a lifting device provided with lifting means which do not have the mentioned drawbacks of the devices of the prior art, that is to say ensuring that the pallet remains perfectly horizontal in any place of the lift stroke, preferably comprising a single motor means or else motor means which are easy to synchronize, the exposed areas of the lifting device being free of grease.

Ce but est obtenu par un dispositif de levage possédant les caractéristiques mentionnées dans les revendications.This object is obtained by a lifting device having the characteristics mentioned in the claims.

La description qui suit montre un dispositif répondant parfaitement au but mentionné ci-dessus, d'autres avantages non encore mentionnés y étant apparents. La description est à lire en regard du dessin annexé comportant une figure unique montrant en perspective un dispositif selon une forme d'exécution préférée de l'invention.The following description shows a device which perfectly meets the above-mentioned aim, other advantages not yet mentioned there being apparent. The description should be read with reference to the appended drawing comprising a single figure showing in perspective a device according to a preferred embodiment of the invention.

Le dispositif de levage 1 est constitué notamment d'un cadre 2 comportant notamment quatre piliers verticaux 20,21,22,23, les faces latérales du cadre 2 comportant de préférence des barres de liaison supérieures 24 reliant les sommets des piliers 20 et 23 ainsi que 21 et 22 ainsi que d'autres barres de liaison inférieures 25 reliant les extrémités inférieures des mêmes piliers, ceci pour augmenter la rigidité du cadre. De préférence au moins une face frontale du cadre 2 ne comporte aucune barre de liaison. Le cadre 2 est fixé au sol par des moyens adéquats.The lifting device 1 consists in particular of a frame 2 comprising in particular four vertical pillars 20,21,22,23, the lateral faces of the frame 2 preferably comprising upper connecting bars 24 connecting the tops of the pillars 20 and 23 thus as 21 and 22 as well as other lower connecting bars 25 connecting the lower ends of the same pillars, this to increase the rigidity of the frame. Preferably at least one front face of the frame 2 has no connecting bar. Frame 2 is fixed to the ground by suitable means.

Les moyens de levage 3 d'une palette 4 sont constitués d'une pluralité de courroies crantées 30, réparties ici en quatre jeux de chacun trois courroies répartis à proximité des quatre coins de la palette 4; les courroies 30 de chaque jeu étant munies d'un moyen de prise de palette 31, fixé auxdites courroies 30, les quatre moyens de prise de palette 31 étant tous disposés à la même hauteur. Chaque jeu de courroies 30 est tendu entre deux jeux de poulies crantées 32, 33, deux jeux de poulies 32 étant fixés à chacune des barres de liaison supérieures 24 et deux autres jeux de poulies crantées 33 étant fixés de la même manière et à l'aplomb des jeux de poules 32 à chacune des barres de liaison inférieures 25. Les axes de rotation des poulies 32 et 33 sont parallèles entre eux et avec la direction des barres de liaison 24,25. L'entraînement des poulies crantées 32,33, respectivement des courroies 30 est obtenu de préférence par l'intermédiaire de deux arbres d'entraînement 34, disposés parallèlement aux barres de liaison 24 et entraînant les poulies crantées 32 directement ou par l'intermédiaire de jeux d'engrenages 35. L'entraînement général des moyens de levage 3 est obtenu par le moteur 39, de préférence un moteur électrique, dont l'arbre de sortie est muni d'une double poulie crantée entraînant deux courroies crantées 38, chacune d'elles entraînant un desdits arbres d'entraînement 34 par l'intermédiaire d'une boîte d'engrenages 36 comportant notamment un pignon d'entrée 37. Afin que les portions des courroies crantées 30 se faisant face et supportant les moyens de prise de palette 31 s'élèvent ou s'abaissent simultanément, il est nécessaire que les arbres d'entraînement 34 soient entraînés à la même vitesse de rotation, mais selon des sens inverses. Cet effet d'inversion des sens de rotation est obtenu par les boîtes d'engrenages 36, où on voit sur la figure que la boîte disposée sur la face latérale avant comporte un pignon de plus que celle disposée sur la face latérale arrière. Ces boîtes d'engrenages 36 peuvent aussi fonctionner comme réducteur de vitesse. On comprend donc que le moteur 39 entraîne simultanément, à la même vitesse de rotation mais en sens inverse les deux arbres 34, respectivement toutes les courroies 30. Il est bien entendu que dans le cas où le dispositif travaille dans une atmosphère chargée en poussières, les parties mécaniques en rotation comme par exemple les boîtes d'engrenages 35, 36 les arbres 34 ou autres, sont de préférence recouvertes de capotages adéquats. Dans la forme d'exécution représentée, le moteur 39 est fixé à un cadre 26 solidaire de deux barres transversales 27 reliées aux deux piliers 22 et 23 formant la face frontale arrière du cadre 2. Tout autre endroit adéquat peut aussi être prévu pour y disposer le moteur 39.The lifting means 3 of a pallet 4 consist of a plurality of toothed belts 30, distributed here in four sets of each three belts distributed near the four corners of the pallet 4; the belts 30 of each set being provided with a pallet gripping means 31, fixed to said belts 30, the four pallet gripping means 31 are all arranged at the same height. Each set of belts 30 is stretched between two sets of toothed pulleys 32, 33, two sets of pulleys 32 being fixed to each of the upper connecting bars 24 and two other sets of toothed pulleys 33 being fixed in the same way and to the perpendicular to the sets of hens 32 at each of the lower connecting bars 25. The axes of rotation of the pulleys 32 and 33 are mutually parallel and with the direction of the connecting bars 24,25. The driving of the toothed pulleys 32, 33, respectively of the belts 30 is preferably obtained by means of two drive shafts 34, arranged parallel to the connecting bars 24 and driving the toothed pulleys 32 directly or by means of sets of gears 35. The general drive of the lifting means 3 is obtained by the motor 39, preferably an electric motor, the output shaft of which is provided with a double toothed pulley driving two toothed belts 38, each of 'they driving one of said drive shafts 34 by means of a gearbox 36 comprising in particular an input pinion 37. So that the portions of the toothed belts 30 facing each other and supporting the pallet gripping means 31 rise or fall simultaneously, it is necessary that the drive shafts 34 are driven at the same speed of rotation, but in opposite directions. This effect of reversing the directions of rotation is obtained by the gearboxes 36, where it can be seen in the figure that the box disposed on the front side face has one more pinion than that arranged on the rear side face. These gear boxes 36 can also function as a speed reducer. It is therefore understood that the motor 39 drives simultaneously, at the same speed of rotation but in the opposite direction the two shafts 34, respectively all the belts 30. It is understood that in the case where the device works in a dust-laden atmosphere, the rotating mechanical parts such as for example the gearboxes 35, 36 the shafts 34 or the like, are preferably covered with suitable cowlings. In the embodiment shown, the motor 39 is fixed to a frame 26 integral with two transverse bars 27 connected to the two pillars 22 and 23 forming the rear front face of the frame 2. Any other suitable place can also be provided to have it the motor 39.

Le dispositif de levage 1 est de préférence muni de moyens de commande 5, schématisés sur la figure par un pupitre de commande 50 relié au moteur 39 pour son alimentation. On peut aussi prévoir un ou plusieurs détecteurs de fin de course ou de position 51, de type connu, afin de déterminer automatiquement les fins de trajet de la palette 4 ou une position d'élévation déterminée. De même, on peut aussi prévoir un moyen de commande, manuel ou automatique d'un dispositif de butée 52 permettant de positionner la palette 4 lors de son entrée dans le dispositif. Les moyens de commande 5, notamment le pupitre de commande 50 peuvent être propres au dispositif de levage ou alors, dans le cas où ce dispositif est destiné à alimenter d'un produit déterminé une machine de production, ce peut être le moyen de commande de ladite machine qui commande automatiquement le fonctionnement du dispositif élévateur selon ses propres besoins.The lifting device 1 is preferably provided with control means 5, shown diagrammatically in the figure by a control console 50 connected to the motor 39 for its supply. One or more end-of-travel or position detectors 51, of known type, can also be provided in order to automatically determine the end of travel of the pallet 4 or a determined elevation position. Likewise, provision can also be made for manual or automatic control means of a stop device 52 making it possible to position the pallet 4 when it enters the device. The control means 5, in particular the control console 50 may be specific to the lifting device or else, in the case where this device is intended to supply a production machine with a given product, it may be the control means for said machine which automatically controls the operation of the lifting device according to its own needs.

Lorsque les moyens' de prise de palette 31 sont amenés en position bas, une palette 4 chargée (la charge n'étant pas représentée sur la figure), est amenée par une face frontale ne comportant de préférence aucune barre de liaison transversale susceptible de gêner le passage de la palette et de sa charge. Les moyens permettant d'amener la palette 4 et de la déposer sur les moyens de prise 31 sont connus de la technique, il peut s'agir d'un chariot élévateur mobile porte-palette, d'un train de rouleaux pénétrant jusque dans le cadre 2 ou de tous autres moyens idoines. La ou les butées 52 sont alors en position pour imiter le mouvement d'avance de la palette 4 afin de la positionner exactement sur les moyens de prise 31. Le moteur 39 peut alors être actionné afin d'entraîner les arbres 34, les courroies 30, respectivement élever la palette 4 et sa charge, suspendue aux moyens de prise 31. Ce mouvement d'élévation peut être arrêté soit en déclenchant manuellement l'alimentation du moteur 39, soit en déclenchant cette alimentation par un ou plusieurs détecteurs 51, propres au dispositif 1 ou faisant directement partie de la machine de production ou de son dispositif d'alimentation.When the pallet gripping means 31 are brought into the low position, a loaded pallet 4 (the load not being shown in the figure) is brought by a front face preferably comprising no transverse connecting bar liable to interfere the passage of the pallet and its load. The means for bringing the pallet 4 and depositing it on the gripping means 31 are known in the art, it may be a mobile forklift pallet carrier, a train of rollers penetrating into the frame 2 or any other suitable means. Or the stops 52 are then in position to imitate the advance movement of the pallet 4 in order to position it exactly on the gripping means 31. The motor 39 can then be actuated in order to drive the shafts 34, the belts 30 , respectively raise the pallet 4 and its load, suspended from the gripping means 31. This elevation movement can be stopped either by manually triggering the supply of the motor 39, or by triggering this supply by one or more detectors 51, specific to the device 1 or forming a direct part of the production machine or its supply device.

Vu que toute la face supérieure du cadre 2 est libre, il est facile à des moyens de prise d'objet de venir décharger la palette arrêtée en position supérieure afin d'alimenter la machine de production. Dans le cas où les objets à prélever de la palette sont disposés en couches successives, des moyens de palpage propres au dispositif de prise peuvent commander des élévations successives de la palette afin de venir toujours prendre lesdits objets à une hauteur constante. Un tel dispositif de prise d'objets est notamment décrit dans EP-A-0.616.962.Since the entire upper face of the frame 2 is free, it is easy for object picking means to unload the pallet stopped in the upper position in order to supply the production machine. If the objects to be removed from the pallet are arranged in successive layers, means of probing specific to the gripping device can control successive elevations of the pallet so as to always come to take said objects at a constant height. Such a device for picking up objects is described in particular in EP-A-0,616,962.

Lorsque la palette 4 a été déchargée, le moteur 39 est à nouveau actionné afin de faire redescendre la palette; la commande du moteur peut être conçue de manière à ce que la vitesse de descente de la palette soit supérieure à sa vitesse de montée. Lorsque la palette vide est en position inférieure, il est possible de retirer la ou les butées 52, la palette vide pouvant alors être poussée sur des rouleaux ou des glissières (non représenté) vers la face arrière du cadre 2 par la palette pleine en cours de chargement dans le dispositif, la palette vide étant éliminée en passant sous la barre 27 servant au support du moteur. Dans le cas où une palette plein succède à une palette vide comme il vient d'être décrit, un autre moyen de butée (non représenté) peut limiter le déplacement de la palette vide, de manière à ce que l'avance de la palette pleine dans le dispositif soit limitée par la palette vide en attente d'être éliminée.When the pallet 4 has been unloaded, the motor 39 is again actuated in order to lower the pallet; the motor control can be designed so that the speed of descent of the pallet is greater than its speed of ascent. When the empty pallet is in the lower position, it is possible to remove the stopper (s) 52, the empty pallet then being able to be pushed on rollers or slides (not shown) towards the rear face of the frame 2 by the full pallet in progress loading into the device, the empty pallet being eliminated by passing under the bar 27 serving to support the motor. In the case where a full pallet succeeds an empty pallet as just described, another stop means (not shown) can limit the displacement of the empty pallet, so that the advance of the full pallet in the device is limited by the empty pallet waiting to be eliminated.

On voit donc que la palette 4 et sa charge est directement suspendue aux courroies crantées 30, la longueur sous charge de chaque courroie étant la même, elles s'allongeront toutes de la même valeur, conservant ainsi la palette 4 et sa charge horizontale. Afin de imiter l'allongement des courroies 30, les âmes desdites courroies sont de préférence garnies d'armatures, formées de brins ou de câbles d'acier ou d'un autre matériau résistant à la traction comme le Kevlar. Des courroies ainsi armées sont généralement disponibles dans le commerce.It can therefore be seen that the pallet 4 and its load is directly suspended from the toothed belts 30, the length under load of each belt being the same, they will all lengthen by the same value, thus retaining the pallet 4 and its horizontal load. In order to imitate the elongation of the belts 30, the cores of said belts are preferably furnished with reinforcements, formed of strands or cables of steel or of another material resistant to traction such as Kevlar. Belts thus armed are generally commercially available.

La forme d'exécution des moyens de levage 3 décrite ici est constituée de quatre jeux de trois courroies, tout autre nombre de jeux constitué de tout autre nombre de courroies peut évidemment être envisagé, le choix du nombre total de courroies et de leur groupement dépendant essentiellement de la charge maximum à élever en regard de la résistance propre de chaque courroie. De même, les arbres d'entraînement 34 ont été décrits entraînant les poulies crantées disposées à la partie supérieure de chaque face latérale; ceci est un avantage dans la mesure où la portion de chaque courroie 30 tendue sous l'effet de la charge est limitée; dans le cas où cette contrainte n'est pas importante et où pour des raisons de disposition de machine cette disposition ne serait pas adéquate, il est aussi possible d'entraîner les poulies disposées à la partie inférieure du dispositif.The embodiment of the lifting means 3 described here consists of four sets of three belts, any other number of sets consisting of any other number of belts can obviously be considered, the choice of the total number of belts and their grouping dependent essentially the maximum load to be raised with respect to the inherent resistance of each belt. Similarly, the drive shafts 34 have been described driving the toothed pulleys disposed at the upper part of each side face; this is an advantage insofar as the portion of each belt 30 tensioned under the effect of the load is limited; in the event that this constraint is not significant and where for reasons of arrangement of the machine this arrangement would not be adequate, it is also possible to drive the pulleys arranged at the bottom of the device.

De préférence, les moyens de prise de palette 31 sont reliés entre eux par une ou plusieurs barres transversales, non représentées sur la figure, afin d'éviter le fléchissement desdits moyens sous la charge.Preferably, the pallet gripping means 31 are interconnected by one or more transverse bars, not shown in the figure, in order to avoid the deflection of said means under load.

Un autre avantage du dispositif selon l'invention est qu'il permet facilement d'être adapté à des charges de largeur variable, par exemple des palettes ou plateaux de charge de largeur plus élevée que la largeur normalisée. Dans ce cas, au moins l'une des faces latérales constituée par exemple des piliers 21 et 22 ainsi que les barres de liaison 24 et 25 est déplaçable latéralement afin de laisser une largeur intérieure libre plus grande entre les piliers 20 et 21, respectivement 22 et 23; pour ceci, les barres transversales 27 peuvent être réglables en longueur et en position verticale afin de positionner le moteur 39 de telle manière que les courroies 38 restent tendues. Il est aussi possible de prévoir alors que chaque arbre d'entraînement 34 soit entraîné par son propre moteur, deux moteurs électriques étant relativement faciles à synchroniser. Cette dernière possibilité permettant de supprimer les barres transversales 27 et le cadre 26 libère entièrement la face arrière du cadre 2, ce qui peut être avantageux dans certains cas de disposition de machine. Dans ce dernier cas, des moyens adéquats sont à prévoir afin de conserver la rigidité du dispositif.Another advantage of the device according to the invention is that it easily makes it possible to be adapted to loads of variable width, for example pallets or load plates of width greater than the standard width. In this case, at least one of the lateral faces consisting for example of the pillars 21 and 22 as well as the connecting bars 24 and 25 can be moved laterally in order to leave a greater free interior width between the pillars 20 and 21, respectively 22 and 23; for this, the transverse bars 27 can be adjustable in length and in a vertical position in order to position the motor 39 so that the belts 38 remain tensioned. It is also possible to provide then that each drive shaft 34 is driven by its own motor, two electric motors being relatively easy to synchronize. The latter possibility of eliminating the cross bars 27 and the frame 26 completely frees the rear face of the frame 2, which can be advantageous in certain cases of machine arrangement. In the latter case, adequate means must be provided in order to maintain the rigidity of the device.

Le dispositif de levage décrit répond au but fixé, la palette restant horizontale sur tout son trajet, le moyen moteur est simple à commander, et les parties exposées du moyen de levage, respectivement les courroies 30 n'ont pas besoin d'être graissées et peuvent donc travailler dans une atmosphère chargée en poussière, les autres parties sensibles du dispositif pouvant être facilement protégées par des capots. En variante, et si l'exigence de travailler en atmosphère chargée en poussière n'est pas prépondérante, il est possible de remplacer les courroies crantées 30 par des chaînes à rouleaux.The lifting device described meets the set goal, the pallet remaining horizontal over its entire path, the motor means is simple to control, and the exposed parts of the lifting means, respectively the belts 30 do not need to be greased and can therefore work in a dust-laden atmosphere, the other sensitive parts of the device being able to be easily protected by covers. Alternatively, and if the requirement to work in a dust-laden atmosphere is not preponderant, it is possible to replace the toothed belts 30 by roller chains.

Claims (13)

Dispositif de levage (1) d'une charge, comprenant des moyens de levage (3) constitués d'au moins un moyen sans fin (30) comportant un moyen d'accrochage (31) de ladite charge, caractérisé en ce que, la charge étant disposée sur une palette (4), les moyens d'accrochage sont des moyens de prise de palette (31).Lifting device (1) for a load, comprising lifting means (3) consisting of at least one endless means (30) comprising a hooking means (31) for said load, characterized in that, the load being disposed on a pallet (4), the hooking means are pallet gripping means (31). Dispositif selon la revendication 1, caractérisé en ce qu'il est constitué d'un cadre parallélipipédique (2) comportant notamment quatre piliers verticaux (20,21,22,23) définissant deux faces latérales et deux faces frontales du cadre, au moins quatre groupes de moyens sans fin (30) disposés en des endroits correspondant aux quatre coins de la palette (4), deux groupes de moyens sans fin étant disposés sur chaque face latérale du cadre, chaque groupe de moyen sans fin (30) comportant un moyen de prise de palette (31), chaque groupe de moyen sans fin étant tendu entre deux jeux de poulies (32,33), l'un des jeux de poulies (33) étant disposé à la partie inférieure du cadre (2), l'autre jeu (33) étant disposé à la partie supérieure du cadre, chaque paire de deux jeux (33) disposés soit sur la partie supérieure, soit sur la partie inférieure de chaque face latérale étant entraînée en rotation par un arbre d'entraînement (34), lesdits arbres d'entraînement étant mis en rotation par des moyens motorisés (39).Device according to claim 1, characterized in that it consists of a parallelipipedic frame (2) comprising in particular four vertical pillars (20,21,22,23) defining two lateral faces and two front faces of the frame, at least four groups of endless means (30) arranged in places corresponding to the four corners of the pallet (4), two groups of endless means being arranged on each side face of the frame, each group of endless means (30) comprising a means pallet grip (31), each group of endless means being stretched between two sets of pulleys (32,33), one of the sets of pulleys (33) being arranged at the bottom of the frame (2), l 'other set (33) being disposed at the upper part of the frame, each pair of two sets (33) arranged either on the upper part or on the lower part of each side face being rotated by a drive shaft ( 34), said drive shafts t rotated by motorized means (39). Dispositif selon la revendication 2, caractérisé en ce que les deux arbres d'entraînement (34) sont entraînés en rotation à même vitesse mais selon des sens inverses.Device according to claim 2, characterized in that the two drive shafts (34) are rotated at the same speed but in opposite directions. Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que chaque arbre d'entraînement (34) est entraîné en rotation par son propre moteur électrique (39.Device according to either of Claims 2 and 3, characterized in that each drive shaft (34) is rotated by its own electric motor (39. Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que les arbres d'entraînement (34) sont entraînés en rotation par un seul moteur électrique (39).Device according to one of claims 2 or 3, characterized in that the drive shafts (34) are rotated by a single electric motor (39). Dispositif selon l'une des revendications 4 ou 5, caractérisé en ce que chaque arbre d'entraînement (34) est entraîné va une boîte d'engrenages (36).Device according to one of claims 4 or 5, characterized in that each drive shaft (34) is driven goes to a gearbox (36). Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre des moyens de commande automatique (5).Device according to one of the preceding claims, characterized in that it further comprises automatic control means (5). Dispositif selon la revendication 7, caractérisé en ce que les moyens de commande automatique (5) comprennent au moins un détecteur (51) du niveau de la palette ou de la charge (4).Device according to claim 7, characterized in that the automatic control means (5) comprise at least one detector (51) of the level of the pallet or of the load (4). Dispositif selon l'une des revendications 7 ou 8, caractérisé en ce que les moyens de commande automatique (5) comprennent au moins un détecteur du niveau de la palette ou de la charge (4), ledit détecteur étant disposé sur la machine alimentée par ledit dispositif élévateur.Device according to either of Claims 7 and 8, characterized in that the automatic control means (5) comprise at least one detector of the level of the pallet or of the load (4), the said detector being arranged on the machine supplied by said lifting device. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'au moins deux piliers (21,22) de l'une des faces latérales du cadre (2) sont aptes à être écartés ou rapprochés des deux autre piliers (20,23) de l'autre des faces latérales.Device according to one of the preceding claims, characterized in that at least two pillars (21,22) of one of the lateral faces of the frame (2) are capable of being separated or brought closer to the two other pillars (20,23 ) on the other side. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'au moins une face frontale du cadre ne comporte aucune barre transversale.Device according to one of the preceding claims, characterized in that at least one front face of the frame has no transverse bar. Dispositif selon l'une des revendications précédentes, caractérisé en ce que chaque moyen sans fin est constitué d'une courroie crantée armée (30).Device according to one of the preceding claims, characterized in that each endless means consists of a reinforced toothed belt (30). Dispositif selon l'une des revendications 1 à 11, caractérisé en ce que chaque moyen sans fin est constitué d'une chaîne à rouleaux (30).Device according to one of claims 1 to 11, characterized in that each endless means consists of a roller chain (30).
EP96810170A 1996-03-18 1996-03-18 Hoisting device Withdrawn EP0796815A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE29623493U DE29623493U1 (en) 1996-03-18 1996-03-18 Lifting device
EP96810170A EP0796815A1 (en) 1996-03-18 1996-03-18 Hoisting device

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EP96810170A EP0796815A1 (en) 1996-03-18 1996-03-18 Hoisting device

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EP0796815A1 true EP0796815A1 (en) 1997-09-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104138026A (en) * 2014-07-28 2014-11-12 湖南农业大学 Conveying device for lifting tobacco leaves to be flue-cured in flue-curing barn
CN107265340A (en) * 2015-06-17 2017-10-20 汪小敏 A kind of car lift
CN113683005A (en) * 2021-08-02 2021-11-23 晟通科技集团有限公司 Anti-falling lifting device and lifting system

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FR750503A (en) * 1933-02-09 1933-08-11 Lifting device particularly applicable to motor cars and other vehicles
FR1036492A (en) * 1951-05-04 1953-09-08 Improvements made to means suitable for lifting a load or heavy machine, and in particular a motor vehicle
DE2354064A1 (en) * 1973-10-29 1975-04-30 Hofmann Maschf Geb CONTINUOUS SPEED CONTROL DEVICE FOR A MULTI-COLUMN LIFT, IN PARTICULAR TWO-COLUMN LIFT
FR2397348A1 (en) * 1977-07-14 1979-02-09 Kempf & Co Ag DEVICE FOR STACKING IDENTICAL ASSEMBLIES, ESPECIALLY FOR PALLETIZING QUADRANGULAR SHAPED BOXES
EP0290796A2 (en) * 1987-05-13 1988-11-17 Focke & Co. (GmbH & Co.) Lifting device, especially palletizer
JPH03166132A (en) * 1989-11-22 1991-07-18 Yunitsuta Kk Elevating/sinking device
JPH05162989A (en) * 1991-12-13 1993-06-29 Daifuku Co Ltd Elevation transporting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR750503A (en) * 1933-02-09 1933-08-11 Lifting device particularly applicable to motor cars and other vehicles
FR1036492A (en) * 1951-05-04 1953-09-08 Improvements made to means suitable for lifting a load or heavy machine, and in particular a motor vehicle
DE2354064A1 (en) * 1973-10-29 1975-04-30 Hofmann Maschf Geb CONTINUOUS SPEED CONTROL DEVICE FOR A MULTI-COLUMN LIFT, IN PARTICULAR TWO-COLUMN LIFT
FR2397348A1 (en) * 1977-07-14 1979-02-09 Kempf & Co Ag DEVICE FOR STACKING IDENTICAL ASSEMBLIES, ESPECIALLY FOR PALLETIZING QUADRANGULAR SHAPED BOXES
EP0290796A2 (en) * 1987-05-13 1988-11-17 Focke & Co. (GmbH & Co.) Lifting device, especially palletizer
JPH03166132A (en) * 1989-11-22 1991-07-18 Yunitsuta Kk Elevating/sinking device
JPH05162989A (en) * 1991-12-13 1993-06-29 Daifuku Co Ltd Elevation transporting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104138026A (en) * 2014-07-28 2014-11-12 湖南农业大学 Conveying device for lifting tobacco leaves to be flue-cured in flue-curing barn
CN104138026B (en) * 2014-07-28 2015-12-23 湖南农业大学 A kind of tobacco flue-curing main room conveying device
CN107265340A (en) * 2015-06-17 2017-10-20 汪小敏 A kind of car lift
CN107265340B (en) * 2015-06-17 2018-11-27 汪小敏 A kind of car lift
CN113683005A (en) * 2021-08-02 2021-11-23 晟通科技集团有限公司 Anti-falling lifting device and lifting system

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