EP0701963A1 - Motorised lift truck with telescopic arm - Google Patents

Motorised lift truck with telescopic arm Download PDF

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Publication number
EP0701963A1
EP0701963A1 EP95402069A EP95402069A EP0701963A1 EP 0701963 A1 EP0701963 A1 EP 0701963A1 EP 95402069 A EP95402069 A EP 95402069A EP 95402069 A EP95402069 A EP 95402069A EP 0701963 A1 EP0701963 A1 EP 0701963A1
Authority
EP
European Patent Office
Prior art keywords
telescopic arm
trolley
trolley according
pivot axis
chassis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95402069A
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German (de)
French (fr)
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EP0701963B1 (en
EP0701963B2 (en
Inventor
Marcel-Claude Braud
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.)
Manitou BF SA
Original Assignee
Manitou BF SA
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Priority claimed from FR9410953A external-priority patent/FR2724374B1/en
Priority claimed from FR9500033A external-priority patent/FR2728884A1/en
Application filed by Manitou BF SA filed Critical Manitou BF SA
Publication of EP0701963A1 publication Critical patent/EP0701963A1/en
Publication of EP0701963B1 publication Critical patent/EP0701963B1/en
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Publication of EP0701963B2 publication Critical patent/EP0701963B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07563—Fork-lift trucks adapted to be carried by transport vehicles
    • 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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
    • B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom

Definitions

  • the invention relates to a motorized handling trolley, in particular of the kind capable of being carried on the back of a carrier vehicle.
  • carriages suitable for being loaded onto a carrier vehicle such as a truck, which can be used for loading and unloading the truck and then be fixed to the rear of the latter so as to be transported.
  • This kind of trolley is generally compact in construction, so as to protrude from the truck by a short distance, its chassis being made so that the front wheels are close to the front end of its loading fork.
  • motorized handling carriages of the aforementioned type generally comprise a chassis having a U-shaped configuration open towards the front, equipped with two front wheels and a rear steering wheel, so that the lifting means extend thus in their most retracted position between the lateral branches of the U-shaped chassis.
  • a general constraint for the design of truck-mounted carts is that these carts must be as light as possible so as not to significantly reduce the payload of the truck. This is the reason why on-board trucks are generally free of counterweights and designed so that the load is placed between the wheel arms behind the front wheels of the truck in the transport position. However, it is necessary to be able to deposit or take a load on the truck bed in the case where the front wheels cannot pass under the said bed, to provide additional devices for advancing the loading forks in front of the front wheels: in this static loading position, the load can be lifted by a trolley on board is substantially equal to the total empty weight of the truck.
  • the on-board trolleys of known type are all produced in the form of a double-effect vertical mast trolley: this double-effect vertical mast allows handling and transport and also facilitates the loading of the trolley at the rear of the truck according to a technique known for example from document FR 2 298 454.
  • the known auxiliary devices for moving the forks in front of the front wheels in the case of a load taking in front of the front wheels are of the type with telescopic forks, fork extender, or retractable mast.
  • each telescopic fork has a sliding sleeve on a support guided by slides or rollers and driven by a jack in synchronization with the deployment of the other fork.
  • This arrangement has the drawback that the telescopic forks are subject to rapid wear by friction in contact with the ground and requires the forks to be kept perfectly horizontal when they are in the deployed position, since the load being distant from the load backrest and from the mast apron, is likely to slide suddenly to the load backrest and thus cause undesirable accidents.
  • this arrangement results in high manufacturing costs and significant maintenance costs for relatively low operating reliability.
  • a deformable scissor structure connects the vertical mast and the deck supporting the forks, thereby moving the forks horizontally forward when the scissor structure is deformed.
  • this system has the drawback of increasing the total overrun of the carriage at the rear of the truck, by a distance corresponding to the length of the deformable scissor structure in the folded position, which increases the length of the total rolling assembly comprising the carrier vehicle and the on-board carriage, and has d on the other hand the disadvantage of reducing the payload of the carrier vehicle corresponding to the additional weight added by the presence of this deformable structure with scissors.
  • the front forks are offset from the mast by the value corresponding to this spacing, which reduces the load carrying capacity of the carriage; while in the static loading position on site, the payload of the truck is reduced due to the displacement of the center of gravity resulting from the additional weight of the deformable scissor structure, weight applied in front of the front wheels.
  • the mast is mounted on a structure which slides inside the chassis of the carriage.
  • This arrangement has the same disadvantages as the fork extender system due to the fact that the forward movement of the assembly comprising the mast and its carrying structure results in a significant forward movement of the center of gravity of the carriage, displacement resulting in a significant reduction in load carrying capacity and static loading stability on site.
  • the implementation of the lateral displacement of the forks requires the installation of intermediate decks or large intermediate load-bearing structures which increase the cost of the forklift and in particular increase its total weight under load, so that the payload of the carriage is decreased to total weight under constant load, and so that the manufacturing cost of the carriage is increased significantly.
  • the invention aims to remedy the aforementioned drawbacks of the prior art, by creating a new motorized handling trolley capable of being loaded onto the rear of a carrier vehicle in a simple and rapid manner.
  • the invention also aims to apply the principle of lateral movement of the supporting structure to the trolley with telescopic arm, without significant increase in the mechanical member, while allowing operation having the same performance as that of the prior art.
  • the subject of the invention is a motorized handling trolley, capable of being carried on the rear of a carrier vehicle, of the type comprising a chassis having a U-shaped configuration, equipped with two front wheels and one wheel. rear steering, a driving position and lifting means, characterized in that the lifting means comprise a telescopic arm pivotally mounted under the action of a lifting cylinder around a substantially horizontal axis located at the rear of the chassis substantially above said rear steering wheel.
  • the invention also relates to a motorized handling trolley, with telescopic arm, comprising a chassis mounted on a plurality of wheels, at least one of which is driving, said chassis carrying a powertrain, a cabin and lifting means arranged between the powertrain and the cabin, said lifting means comprising said telescopic arm pivotally mounted about a substantially horizontal axis, characterized in that all of the lifting means comprising the telescopic arm can be moved transversely, so as to allow precise adjustment over a predetermined distance of the positioning of the lifting means for gripping the load.
  • Figure 1 schematically shows a side elevational view in the direction of arrow I of Figures 2 and 3 of a carriage according to the invention.
  • FIG. 2 schematically represents a simplified top view in the direction of arrow II in FIGS. 1 and 3 of a carriage according to the invention.
  • Figure 3 schematically shows a rear view in the direction of the arrows III of Figures 1 and 2 of a carriage according to the invention.
  • Figures 4 and 5 show load diagrams characteristic of a carriage according to the invention.
  • Figures 6 to 8 schematically represent the steps of a method of boarding a trolley according to the invention at the rear of a carrier vehicle.
  • FIG. 9 schematically shows in section a partial axial view of a telescopic arm of the industrial truck according to the invention.
  • FIG. 10 represents a view in partial axial section of another carriage according to the invention.
  • a trolley according to the invention comprises a chassis 1 having a U-shaped configuration opening towards the front, a station line 2, a powertrain 3 and lifting means 4.
  • a branch 1a of the chassis carries a front wheel 5 while the other branch 1b carries the other front wheel 6.
  • the rear steering wheel 7 is mounted substantially in the middle of the main body of the chassis.
  • the rear steering wheel 7 is controlled by a steering wheel 8 located in the driving position 2 which also includes all the control members of the lifting means 4.
  • the powertrain 3 is preferably a group comprising a heat engine driving a hydraulic pump, the necessary distribution and control members being grouped with the powertrain 3 and controlled directly from the driving position 2.
  • the lifting means 4 comprise a telescopic arm 9 mounted to pivot about a substantially horizontal axis 10 located at the rear of the chassis 1 substantially above the rear steering wheel 7.
  • the control and driving position is located on one side of the truck, the powertrain 3 is located on the side opposite the control and driving position, and the telescopic arm 9 in its lowered and retracted position corresponding to the transport of a load passes between the driving position 2 and the powertrain 3.
  • This arrangement thus provides excellent visibility on the load and on the lifting means 4, unlike the arrangement of the prior art where the retractable mast obstructed the visibility of the operator.
  • the telescopic arm 9 carries at its end remote from the pivot axis 10 a gripping member 11 which can be pivotally pivoted about a horizontal axis 12 under the action of an actuation cylinder not shown and of a type known per se .
  • the gripping member 11 is preferably shaped like an apron supporting forks 13a, 13b.
  • the forks 13a, 13b can start from the lowered and retracted position of the telescopic arm 9 corresponding to the transport of a load and shown in solid lines, to pass to other horizontal or inclined positions in a direction of digging or a direction of dumping. shown in dotted lines.
  • the telescopic arm 9 is extensible under the action of an internal cylinder not shown and pivots under the action of a lifting cylinder 14 disposed laterally relative to the arm and fixed to a bracket fixed to the beam of the telescopic arm 9.
  • the trolley according to the invention is advantageously fitted with a compensating cylinder, capable of holding the forks 13a, 13b horizontal during the transport of the load in the case of a moving the truck over rough terrain.
  • the lifting cylinder 14 and the compensation cylinder 15 are mounted on either side of the beam of the telescopic arm 9, in a position which does not interfere with the visibility of the driver when the telescopic arm 9 is in position transport, fully lowered and retracted.
  • all of the lifting means 4 can be moved transversely by a predetermined distance d so as to allow precise adjustment of the positioning of the lifting means when gripping the load.
  • the lifting means 4 comprising the telescopic arm 9 can be displaced over the stroke d according to a movement controlled and preferably controlled hydraulically under the action of translation means arranged in the vicinity of the pivot axis 10.
  • the hydraulic actuation means comprise at least one hydraulic cylinder, the actuation direction of which is substantially parallel to the pivot axis 10.
  • a trolley according to the invention presents a stability diagram without a crutch corresponding to the lifting of a load of 9000 N at a distance of 1 meter in front of the front wheels: this gives performances equivalent to or better than those of on-board carriages of the prior art.
  • the carriages according to the invention have a range at the front of the wheels significantly greater than the carts of the prior art.
  • FIG. 5 represents a stability diagram with crutch further improved compared to the stability diagram without crutch of FIG. 4 and compared with the characteristics of the on-board carriages of the prior art, in the case where a carriage is fitted according to the invention of retractable stabilizers 16 capable of coming to bear on the ground in front of the point of contact P of a front wheel 5 with the ground.
  • the retractable stabilizers 16 capable of coming to bear on the ground in front of the points of contact of the front wheels 5 with the ground are fixed to the chassis 1 of the trolley according to the invention in a manner known per se for the fixing of stabilizers on the on-board carriages of the prior art and controlled analogously by an actuating cylinder exerting a substantially vertical thrust.
  • a method of loading a trolley according to the invention and securing to a carrier vehicle comprises the steps described below.
  • the telescopic arm is lengthened by a length of the order of 20 cm, so as to thread the forks 13a, 13b in sheaths 20 provided for this purpose and secured to the carrier vehicle under the platform. the latter preferably by quick-attach attachment means of a type known per se.
  • supports 21 are arranged in a predetermined position allowing the forks 13a, 13b and the slightly extended telescopic arm 9 to pass between the supports 21.
  • the telescopic arm 9 is completely retracted, which has the effect of resting the chassis 2 on the support 21.
  • the rear steering wheel 7 is preferably turned completely to the left or completely to the right, so as to limit the protrusion of the carriage towards the rear of the vehicle.
  • the carriage then rests under the effect of its own weight on the support 21 on which it is applied by the telescopic arm in the fully retracted position: the equilibrium position of the loading of the machine according to the invention on board the rear of the carrier vehicle is perfectly stable and allows transport over long distances.
  • This locking means can for example comprise two lateral locks controlled directly by means of a lever arranged in the station 2 for driving and controlling the carriage.
  • These lateral locks can be mechanical or hydraulically controlled, or electrically controlled locks.
  • the locking means is controlled by stopping the motor of the carriage or the interruption of electrical energy of the carriage, or the interruption of hydraulic energy of the carriage.
  • the powertrain 3 can advantageously be constituted by an electric group operating on battery in the case of applications prohibiting the use of heat engines.
  • a piston 30 secured to the pivot axis 10 of the telescopic arm is shown schematically by its main beam 9.
  • the piston 30 delimits two chambers 31a and 31b to inside a jacket 32.
  • a first bore 33a made substantially coaxially with the pivot axis 10 and a second bore 33b made substantially coaxially with the pivot axis 10 allow the feeding of each chamber 31a or 31b respectively hydraulic fluid.
  • the axis 10 is mounted integral with the chassis 1 by means of two mounting parts 34a, 34b assembled to the chassis 1 by screwing, for example of non-protruding screws 35a, 35b, or by any other means allowing the installation of the pivot axis 10 and the passage of the piston 30 through an orifice of diameter provided for this purpose.
  • the jacket 32 is closed at its ends by two closing rings 38a, 38b carrying suitable seals, the rings 38a, 38b being fixed in a manner known per se by screwing or equivalent means.
  • the structure thus described has a double rod cylinder conformation, in which the piston 30 is fixed and the jacket 32 moves in a first direction when the chamber 31a is put under hydraulic pressure and in a second direction opposite to said first direction when the chamber 31b is put under hydraulic pressure.
  • a person skilled in the art can thus easily determine a transverse displacement stroke d as a function of the internal dimensions of the jacket 32 and the width of the piston 30 remaining stationary relative to the pivot axis 10 and relative to the chassis 1 of the forklift.
  • each support sleeve 36a or 36b is integral with a bracket 37a or 37b which is itself connected to the main beam of the telescopic lifting arm of the trolley according to the invention.
  • the invention makes it possible to carry out a lateral movement in a simple manner which does not hamper the pivoting of the telescopic arm, the lateral displacement means simultaneously allowing the pivoting of the telescopic arm around the substantially horizontal axis 10.
  • a piston 40 is integral with the pivot axis 10 of the telescopic arm shown diagrammatically by its main beam 9.
  • the piston 40 delimits two chambers 41a and 41b at inside a jacket 42.
  • two supply or discharge orifices for hydraulic fluids 43a are produced, 43b directly in the jacket 42.
  • Such tapped orifices 43a, 43b for supplying hydraulic fluid are of a type known per se and do not require a more detailed description.
  • the axis 10 is mounted integral with the chassis 1 by means of two mounting parts 44a, 44b assembled to the chassis 1 for example by screwing, of non-protruding screws 45a, 45b, or by any other means allowing the installation of the pivot axis 10 and the passage of the piston 40 through an orifice of diameter provided for this purpose.
  • the jacket 42 is closed at its ends by two closing rings 48a, 48b carrying suitable seals, the rings 48a, 48b being fixed in a manner known per se by screwing or equivalent means.
  • the structure thus described has a double rod cylinder conformation, in which the piston 40 is fixed and the jacket 42 moves in a first direction when the chamber 41a is pressurized hydraulic and in a second direction opposite to said first direction when the chamber 41b is put under hydraulic pressure.
  • a person skilled in the art can thus easily determine a transverse displacement stroke d as a function of the internal dimensions of the jacket 42 and the width of the piston 40 remaining stationary relative to the pivot axis 10 and relative to the chassis 1 of the forklift.
  • each support sleeve 46a or 46b is integral with a bracket 47a or 47b which is itself connected to the main beam of the telescopic lifting arm of the trolley according to the invention.
  • the invention makes it possible to carry out a lateral movement in a simple manner which does not hamper the pivoting of the telescopic arm, the lateral displacement means simultaneously allowing the pivoting of the telescopic arm around the substantially horizontal axis 10.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Handcart (AREA)

Abstract

The fork lift truck has a U-shaped chassis with two front wheels and a single steerable rear wheel, a control cab (2) and a lifting system with a telescopic arm (9). The arm is pivoted horizontally to the rear of the chassis above the steerable rear wheel and is raised or lowered by a power cylinder. The control cab (2) is situated to one side of the fork lift truck and its engine on the other, with the pivoted lifting arm in between the two, equipped with a supporting panel for the forks on its free end, controlled by a second power cylinder which keeps the forks horizontal. The lorry which carries the fork lift truck has sleeves (20) to receive the forks and a support (21) to take the weight of the raised truck.

Description

L'invention est relative à un chariot de manutention motorisé, notamment du genre apte à être embarqué à l'arrière d'un véhicule porteur.The invention relates to a motorized handling trolley, in particular of the kind capable of being carried on the back of a carrier vehicle.

On connaît des chariots aptes à être embarqués sur un véhicule porteur tel qu'un camion, pouvant être utilisés au chargement et au déchargement du camion et ensuite être fixés à l'arrière de celui-ci pour être ainsi transportés. Ce genre de chariot est généralement de réalisation peu encombrante, de manière à dépasser du camion d'une faible distance, son châssis étant réalisé de manière que les roues avant soient voisines de l'extrémité avant de sa fourche de chargement.There are known carriages suitable for being loaded onto a carrier vehicle such as a truck, which can be used for loading and unloading the truck and then be fixed to the rear of the latter so as to be transported. This kind of trolley is generally compact in construction, so as to protrude from the truck by a short distance, its chassis being made so that the front wheels are close to the front end of its loading fork.

A cet effet, les chariots de manutention motorisés du type précité comportent généralement un châssis présentant une conformation en U ouvert vers l'avant, équipé de deux roues avant et d'une roue arrière directrice, de sorte que les moyens de levage s'étendent ainsi dans leur position la plus rétractée entre les branches latérales du châssis en U.To this end, motorized handling carriages of the aforementioned type generally comprise a chassis having a U-shaped configuration open towards the front, equipped with two front wheels and a rear steering wheel, so that the lifting means extend thus in their most retracted position between the lateral branches of the U-shaped chassis.

Une contrainte générale pour la conception des chariots embarqués sur camion est que ces chariots doivent être aussi légers que possible pour ne pas diminuer notablement la charge utile du camion. C'est la raison pour laquelle les chariots embarqués sont généralement dépourvus de contrepoids et conçus de manière que la charge soit disposée entre les bras de roues à l'arrière des roues avant du chariot en position de transport. Cependant, il est nécessaire pour pouvoir déposer ou prendre une charge sur le plateau du camion dans le cas où les roues avant ne peuvent pas passer sous ledit plateau, de prévoir des dispositifs annexes pour avancer les fourches de chargement en avant des roues avant : dans cette position statique de chargement, la charge pouvant être levée par un chariot embarqué est sensiblement égale au poids total à vide du chariot.A general constraint for the design of truck-mounted carts is that these carts must be as light as possible so as not to significantly reduce the payload of the truck. This is the reason why on-board trucks are generally free of counterweights and designed so that the load is placed between the wheel arms behind the front wheels of the truck in the transport position. However, it is necessary to be able to deposit or take a load on the truck bed in the case where the front wheels cannot pass under the said bed, to provide additional devices for advancing the loading forks in front of the front wheels: in this static loading position, the load can be lifted by a trolley on board is substantially equal to the total empty weight of the truck.

Pour satisfaire aux contraintes précitées, les chariots embarqués de type connu sont tous réalisés sous forme de chariot à mât vertical à double effet : ce mât vertical à double effet permet la manutention et le transport et facilite également le chargement du chariot à l'arrière du camion selon une technique connues par exemple d'après le document FR 2 298 454.To meet the above-mentioned constraints, the on-board trolleys of known type are all produced in the form of a double-effect vertical mast trolley: this double-effect vertical mast allows handling and transport and also facilitates the loading of the trolley at the rear of the truck according to a technique known for example from document FR 2 298 454.

Les dispositifs annexes connus pour déplacer les fourches à l'avant des roues avant dans le cas d'une prise de charge en avant des roues avant sont du type à fourches télescopiques, à extenseur de fourche, ou à mât rétractable.The known auxiliary devices for moving the forks in front of the front wheels in the case of a load taking in front of the front wheels are of the type with telescopic forks, fork extender, or retractable mast.

Dans le cas des fourches télescopiques, chaque fourche télescopique présente un fourreau coulissant sur un support guidé par des glissières ou des galets et entraîné par un vérin de manière synchronisée avec le déploiement de l'autre fourche. Cette disposition présente l'inconvénient selon lequel les fourches télescopiques sont soumises à une usure rapide par frottement au contact du sol et nécessite de maintenir les fourches parfaitement horizontales lorsqu'elles sont en position déployée, car la charge se trouvant éloignée du dosseret de charge et du tablier du mât, est susceptible de glisser brusquement jusqu'au dosseret de charge et de provoquer ainsi des accidents indésirables. En outre, cette disposition entraîne des coûts de fabrication élevés et des coûts d'entretien importants pour une fiabilité de fonctionnement relativement faible.In the case of telescopic forks, each telescopic fork has a sliding sleeve on a support guided by slides or rollers and driven by a jack in synchronization with the deployment of the other fork. This arrangement has the drawback that the telescopic forks are subject to rapid wear by friction in contact with the ground and requires the forks to be kept perfectly horizontal when they are in the deployed position, since the load being distant from the load backrest and from the mast apron, is likely to slide suddenly to the load backrest and thus cause undesirable accidents. In addition, this arrangement results in high manufacturing costs and significant maintenance costs for relatively low operating reliability.

Dans le système à extenseur de fourches, une structure déformable à ciseaux relie le mât vertical et le tablier supportant les fourches, en déplaçant ainsi les fourches horizontalement vers l'avant lors de la déformation de la structure à ciseaux. Ce système présente d'une part l'inconvenient d'augmenter le dépassement total du chariot à l'arrière du camion, d'une distance correspondant à la longueur de la structure déformable à ciseaux en position repliée, ce qui augmente la longueur de l'ensemble total roulant comprenant le véhicule porteur et le chariot embarqué, et présente d'autre part l'inconvénient de diminuer la charge utile du véhicule porteur correspondant du poids supplémentaire ajouté par la présence de cette structure déformable à ciseaux. En outre, du fait que le tablier supportant les fourches est écarté du mât en position rentrée, les fourches avant sont déportées du mât de la valeur correspondant à cet écartement, ce qui diminue la capacité de transport de charge du chariot ; tandis qu'en position de chargement statique sur place, la charge utile du chariot est réduite en raison du déplacement du centre de gravité résultant du poids supplémentaire de la structure déformable à ciseaux, poids appliqué en avant des roues avant.In the fork extender system, a deformable scissor structure connects the vertical mast and the deck supporting the forks, thereby moving the forks horizontally forward when the scissor structure is deformed. On the one hand, this system has the drawback of increasing the total overrun of the carriage at the rear of the truck, by a distance corresponding to the length of the deformable scissor structure in the folded position, which increases the length of the total rolling assembly comprising the carrier vehicle and the on-board carriage, and has d on the other hand the disadvantage of reducing the payload of the carrier vehicle corresponding to the additional weight added by the presence of this deformable structure with scissors. In addition, because the deck supporting the forks is spaced from the mast in the retracted position, the front forks are offset from the mast by the value corresponding to this spacing, which reduces the load carrying capacity of the carriage; while in the static loading position on site, the payload of the truck is reduced due to the displacement of the center of gravity resulting from the additional weight of the deformable scissor structure, weight applied in front of the front wheels.

Dans les dispositifs à mât rétractable, le mât est monté sur une structure qui coulisse à l'intérieur du châssis du chariot. Cette disposition présente les mêmes inconvénients que le système extenseur de fourches en raison du fait que le déplacement vers l'avant de l'ensemble comportant le mât et sa structure porteuse entraîne un déplacement important vers l'avant du centre de gravité du chariot, déplacement entraînant une réduction notable de la capacité de transport de charge et de la stabilité en chargement statique sur place.In retractable mast devices, the mast is mounted on a structure which slides inside the chassis of the carriage. This arrangement has the same disadvantages as the fork extender system due to the fact that the forward movement of the assembly comprising the mast and its carrying structure results in a significant forward movement of the center of gravity of the carriage, displacement resulting in a significant reduction in load carrying capacity and static loading stability on site.

De la manière générale, tous les chariots aptes à être embarqués sur camion de l'art antérieur, c'est-à-dire des chariots à mât vertical à double effet, présentent l'inconvénient selon lequel le mât disposé à l'avant du conducteur obstrue le champ de visibilité sur la charge et sur la fourche située à l'opposé du poste de conduite. Ces chariots embarqués de l'art antérieur présentent genéralement une faible garde au sol et ne sont pas aptes à circuler sur des terrains accidentés.In general, all of the carriages suitable for being loaded onto a truck of the prior art, that is to say double-effect vertical mast carriages, have the disadvantage that the mast disposed at the front of the driver obstructs the field of vision on the load and on the fork located opposite the driving position. These on-board carts of the prior art generally have a low ground clearance and are not suitable for traveling on uneven terrain.

Il est connu, dans ce domaine des chariots à mât vertical qui n'est pas visé par la présente invention, de déplacer les fourches porteuses latéralement pour les positionner en correspondance avec les charges à manutentionner. En particulier, on peut réaliser le deplacement latéral des fourches à l'aide d'un tablier intermédiaire portant les fourches et se deplaçant latéralement par rapport à un tablier principal. Le déplacement latéral de l'ensemble de la structure de levage comprenant un mât vertical portant un ou plusieurs tabliers peut également être réalisé par rapport au châssis porteur par des moyens appropriés.It is known, in this field of vertical mast carriages which is not the subject of the present invention, to move the carrying forks laterally to position them in correspondence with the loads to be handled. In particular, it is possible to carry out the lateral displacement of the forks using an intermediate apron carrying the forks and moving laterally with respect to a main apron. Lateral displacement of the entire lifting structure comprising a vertical mast carrying one or more decks can also be achieved relative to the carrying frame by appropriate means.

Dans cette technique connue, la mise en oeuvre du déplacement latéral des fourches exige de mettre en place des tabliers intermédiaires ou structures porteuses intermédiaires importantes qui renchérissent le coût du chariot élévateur et en particulier augmentent son poids total en charge, de sorte que la charge utile du chariot est diminuée à poids total en charge constant, et de sorte que le coût de fabrication du chariot est augmenté de manière notable.In this known technique, the implementation of the lateral displacement of the forks requires the installation of intermediate decks or large intermediate load-bearing structures which increase the cost of the forklift and in particular increase its total weight under load, so that the payload of the carriage is decreased to total weight under constant load, and so that the manufacturing cost of the carriage is increased significantly.

L'invention a pour but de remédier aux inconvénients précités de l'art antérieur, en créant un nouveau chariot de manutention motorisé apte à être embarqué à l'arrière d'un véhicule porteur de manière simple et rapide.The invention aims to remedy the aforementioned drawbacks of the prior art, by creating a new motorized handling trolley capable of being loaded onto the rear of a carrier vehicle in a simple and rapid manner.

L'invention a également pour but d'appliquer le principe du déplacement latéral de la structure porteuse au chariot à bras télescopique, sans augmentation notable d'organe mécanique, tout en permettant une exploitation présentant les mêmes performances que celles de l'art antérieur.The invention also aims to apply the principle of lateral movement of the supporting structure to the trolley with telescopic arm, without significant increase in the mechanical member, while allowing operation having the same performance as that of the prior art.

L'invention a pour objet un chariot de manutention motorisé, apte à être embarqué à l'arrière d'un véhicule porteur, du genre comportant un châssis présentant une conformation en U, équipé de deux roues avant et d'une roue arrière directrice, un poste de conduite et des moyens de levage, caractérisé en ce que les moyens de levage comportent un bras télescopique monté à pivotement sous l'action d'un vérin de levage autour d'un axe sensiblement horizontal situé à l'arrière du châssis sensiblement au-dessus de ladite roue arrière directrice.The subject of the invention is a motorized handling trolley, capable of being carried on the rear of a carrier vehicle, of the type comprising a chassis having a U-shaped configuration, equipped with two front wheels and one wheel. rear steering, a driving position and lifting means, characterized in that the lifting means comprise a telescopic arm pivotally mounted under the action of a lifting cylinder around a substantially horizontal axis located at the rear of the chassis substantially above said rear steering wheel.

Selon d'autres caractéristiques de l'invention :

  • le poste de conduite est situé sur un côté du chariot, le groupe motopropulseur est situé du côté opposé au poste de conduite et le bras télescopique dans sa position abaissée et rétractée correspondant au transport d'une charge passe entre le poste de conduite et le groupe motopropulseur.
  • le bras télescopique porte à son extrémité éloignée de l'axe de pivotement un organe de préhension orientable à pivotement autour d'un axe horizontal sous l'action d'un vérin d'actionnement.
  • le bras télescopiques porte à son extrémité éloignée de l'axe de pivotement un tablier supportant des fourches.
  • le bras télescopique équipé d'un tablier supportant des fourches est soumis à l'action d'un vérin de compensation, de manière à maintenir les fourches horizontales.
  • le châssis porte des stabilisateurs rétractables aptes à venir en appui sur le sol en avant des points de contact des roues avant avec le sol.
  • le vérin de levage et le vérin de compensation sont montés de part et d'autre de la poutre du bras télescopique.
  • le chariot comporte un moyen de verrouillage du chariot embarqué sur le véhicule porteur avec un support solidaire du véhicule porteur.
  • ledit moyen de verrouillage est commandé directement à partir du poste de conduite du chariot.
  • le moyen de verrouillage est commandé sur arrêt du moteur du chariot.
According to other characteristics of the invention:
  • the driving position is located on one side of the truck, the powertrain is located on the side opposite the driving position and the telescopic arm in its lowered and retracted position corresponding to the transport of a load passes between the driving position and the group powertrain.
  • the telescopic arm carries at its end remote from the pivot axis a gripping member which can be pivotally pivoted about a horizontal axis under the action of an actuating cylinder.
  • the telescopic arm carries at its end remote from the pivot axis an apron supporting forks.
  • the telescopic arm equipped with an apron supporting the forks is subjected to the action of a compensating jack, so as to keep the forks horizontal.
  • the chassis carries retractable stabilizers capable of coming to bear on the ground in front of the points of contact of the front wheels with the ground.
  • the lifting cylinder and the compensation cylinder are mounted on either side of the beam of the telescopic arm.
  • the carriage comprises a means for locking the carriage on board the carrier vehicle with a support integral with the carrier vehicle.
  • said locking means is controlled directly from the driving position of the truck.
  • the locking means is controlled when the carriage motor stops.

L'invention a également pour objet un chariot de manutention motorisé, à bras télescopique, comprenant un châssis monté sur une pluralité de roues dont l'une au moins est motrice, ledit châssis portant un groupe motopropulseur, une cabine et des moyens de levage disposés entre le groupe motopropulseur et la cabine, lesdits moyens de levage comprenant ledit bras télescopique monté à pivotement autour d'un axe sensiblement horizontal, caractérisé en ce que l'ensemble des moyens de levage comprenant le bras télescopique est déplaçable transversalement, de manière à permettre un réglage précis sur une distance prédéterminée du positionnement des moyens de levage en vue de la préhension de la charge.The invention also relates to a motorized handling trolley, with telescopic arm, comprising a chassis mounted on a plurality of wheels, at least one of which is driving, said chassis carrying a powertrain, a cabin and lifting means arranged between the powertrain and the cabin, said lifting means comprising said telescopic arm pivotally mounted about a substantially horizontal axis, characterized in that all of the lifting means comprising the telescopic arm can be moved transversely, so as to allow precise adjustment over a predetermined distance of the positioning of the lifting means for gripping the load.

Selon d'autres caractéristiques de l'invention :

  • le bras télescopique est déplaçable transversalement sur son axe de pivotement sous l'action de moyens d'actionnement disposés au voisinage dudit axe de pivotement,
  • lesdits moyens d'actionnement sont des moyens d'actionnement hydraulique comportant au moins un vérin hydraulique dont la direction d'actionnement est sensiblement parallèle à l'axe de pivotement du bras télescopique,
  • les moyens d'actionnement sont pratiquement coaxiaux à l'axe de pivotement du bras télescopique,
  • les moyens d'actionnement sont à double effet,
  • les moyens d'actionnement sont des moyens hydrauliques alimentés par des orifices sensiblement parallèles ou coaxiaux à l'axe de pivotement,
  • les moyens d'actionnement sont des moyens hydrauliques alimentés par des orifices sensiblement orthogonaux à l'axe de pivotement.
According to other characteristics of the invention:
  • the telescopic arm is movable transversely on its pivot axis under the action of actuating means arranged in the vicinity of said pivot axis,
  • said actuation means are hydraulic actuation means comprising at least one hydraulic cylinder whose actuation direction is substantially parallel to the pivot axis of the telescopic arm,
  • the actuation means are practically coaxial with the pivot axis of the telescopic arm,
  • the actuation means are double-acting,
  • the actuation means are hydraulic means supplied by orifices substantially parallel or coaxial with the pivot axis,
  • the actuating means are hydraulic means supplied by orifices substantially orthogonal to the pivot axis.

L'invention sera mieux comprise grâce à la description qui va suivre donnée à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :The invention will be better understood thanks to the description which follows given by way of nonlimiting example with reference to the appended drawings in which:

La figure 1 représente schématiquement une vue en élévation latérale selon la direction de la flèche I des figures 2 et 3 d'un chariot selon l'invention.Figure 1 schematically shows a side elevational view in the direction of arrow I of Figures 2 and 3 of a carriage according to the invention.

La figure 2 représente schématiquement une vue simplifiée de dessus dans le sens de la flèche II des figures 1 et 3 d'un chariot selon l'invention.FIG. 2 schematically represents a simplified top view in the direction of arrow II in FIGS. 1 and 3 of a carriage according to the invention.

La figure 3 représente schématiquement une vue arrière dans le sens de la direction des flèches III des figures 1 et 2 d'un chariot selon l'invention.Figure 3 schematically shows a rear view in the direction of the arrows III of Figures 1 and 2 of a carriage according to the invention.

Les figures 4 et 5 représentent des diagrammes de charge caractéristiques d'un chariot selon l'invention.Figures 4 and 5 show load diagrams characteristic of a carriage according to the invention.

Les figures 6 à 8 représentent schématiquement les étapes d'un procédé d'embarquement d'un chariot selon l'invention à l'arrière d'un véhicule porteur.Figures 6 to 8 schematically represent the steps of a method of boarding a trolley according to the invention at the rear of a carrier vehicle.

La figure 9 représente schématiquement en coupe une vue partielle axiale d'un bras télescopique de chariot de manutention selon l'invention.FIG. 9 schematically shows in section a partial axial view of a telescopic arm of the industrial truck according to the invention.

La figure 10 représente une vue en coupe axiale partielle d'un autre chariot selon l'invention.FIG. 10 represents a view in partial axial section of another carriage according to the invention.

En référence aux figures 1 à 3, dans lesquelles les éléments identiques ou fonctionnellement équivalents sont repérés par des chiffres de référence identiques, un chariot selon l'invention comporte un châssis 1 présentant une conformation en U s'ouvrant vers l'avant, un poste de conduite 2, un groupe motopropulseur 3 et des moyens de levage 4.With reference to FIGS. 1 to 3, in which the identical or functionally equivalent elements are identified by identical reference numbers, a trolley according to the invention comprises a chassis 1 having a U-shaped configuration opening towards the front, a station line 2, a powertrain 3 and lifting means 4.

Une branche 1a du châssis porte une roue avant 5 tandis que l'autre branche 1b porte l'autre roue avant 6. La roue arrière 7 directrice est montée sensiblement au milieu du corps principal du châssis. La roue arrière directrice 7 est commandée par un volant 8 situé dans le poste de conduite 2 qui comporte également tous les organes de commande des moyens de levage 4.A branch 1a of the chassis carries a front wheel 5 while the other branch 1b carries the other front wheel 6. The rear steering wheel 7 is mounted substantially in the middle of the main body of the chassis. The rear steering wheel 7 is controlled by a steering wheel 8 located in the driving position 2 which also includes all the control members of the lifting means 4.

Le groupe motopropulseur 3 est de préférence un groupe comportant un moteur thermique entraînant une pompe hydraulique, les organes de distribution et de commande nécessaires étant regroupés avec le groupe motopropulseur 3 et commandés directement depuis le poste de conduite 2.The powertrain 3 is preferably a group comprising a heat engine driving a hydraulic pump, the necessary distribution and control members being grouped with the powertrain 3 and controlled directly from the driving position 2.

Selon l'invention, les moyens de levage 4 comportent un bras télescopique 9 monté à pivotement autour d'un axe 10 sensiblement horizontal situé à l'arrière du châssis 1 sensiblement au dessus de la roue arrière directrice 7.According to the invention, the lifting means 4 comprise a telescopic arm 9 mounted to pivot about a substantially horizontal axis 10 located at the rear of the chassis 1 substantially above the rear steering wheel 7.

Le poste de commande et de conduite est situé sur un côté du chariot, le groupe motopropulseur 3 est situé du côte opposé au poste de commande et de conduite, et le bras télescopique 9 dans sa position abaissée et rétractée correspondant au transport d'une charge passe entre le poste de conduite 2 et le groupe motopropulseur 3.The control and driving position is located on one side of the truck, the powertrain 3 is located on the side opposite the control and driving position, and the telescopic arm 9 in its lowered and retracted position corresponding to the transport of a load passes between the driving position 2 and the powertrain 3.

Cette disposition fournit ainsi une excellente visibilité sur la charge et sur les moyens de levage 4, contrairement à la disposition de l'art antérieur où le mât rétractable obstruait la visibilité de l'opérateur.This arrangement thus provides excellent visibility on the load and on the lifting means 4, unlike the arrangement of the prior art where the retractable mast obstructed the visibility of the operator.

Le bras télescopique 9 porte à son extrémité éloignée de l'axe de pivotement 10 un organe de préhension 11 orientable à pivotement autour d'un axe horizontal 12 sous l'action d'un vérin d'actionnement non représenté et de type connu en soi.The telescopic arm 9 carries at its end remote from the pivot axis 10 a gripping member 11 which can be pivotally pivoted about a horizontal axis 12 under the action of an actuation cylinder not shown and of a type known per se .

L'organe de préhension 11 est de préférence conformé en tablier supportant des fourches 13a, 13b. Les fourches 13a, 13b peuvent partir de la position abaissée et rétractée du bras télescopique 9 correspondant au transport d'une charge et représentée en traits pleins, pour passer à d'autres positions horizontales ou inclinées dans un sens de cavage ou un sens de déversement représentées en traits pointillés.The gripping member 11 is preferably shaped like an apron supporting forks 13a, 13b. The forks 13a, 13b can start from the lowered and retracted position of the telescopic arm 9 corresponding to the transport of a load and shown in solid lines, to pass to other horizontal or inclined positions in a direction of digging or a direction of dumping. shown in dotted lines.

Le bras télescopique 9 est extensible sous l'action d'un vérin intérieur non représenté et pivote sous l'action d'un vérin de levage 14 disposé latéralement par rapport au bras et fixé à une équerre solidaire de la poutre du bras télescopique 9.The telescopic arm 9 is extensible under the action of an internal cylinder not shown and pivots under the action of a lifting cylinder 14 disposed laterally relative to the arm and fixed to a bracket fixed to the beam of the telescopic arm 9.

Dans le cas d'un transport de charge sur terrain accidenté, on équipe avantageusement le chariot selon l'invention d'un vérin de compensation, apte à maintenir les fourches 13a, 13b horizontales lors du transport de la charge dans le cas d'un déplacement du chariot sur terrain accidenté. De préférence, le vérin de levage 14 et le vérin de compensation 15 sont montés de part et d'autre de la poutre du bras télescopique 9, dans une position n'interférant pas avec la visibilité du conducteur lorsque le bras télescopique 9 est en position de transport, entièrement abaissé et rétracté.In the case of a load transport on uneven ground, the trolley according to the invention is advantageously fitted with a compensating cylinder, capable of holding the forks 13a, 13b horizontal during the transport of the load in the case of a moving the truck over rough terrain. Preferably, the lifting cylinder 14 and the compensation cylinder 15 are mounted on either side of the beam of the telescopic arm 9, in a position which does not interfere with the visibility of the driver when the telescopic arm 9 is in position transport, fully lowered and retracted.

Avantageusement, l'ensemble des moyens de levage 4 est déplaçable transversalement d'une distance prédéterminée d de manière à permettre un réglage précis du positionnement des moyens de levage lors de la préhension de la charge.Advantageously, all of the lifting means 4 can be moved transversely by a predetermined distance d so as to allow precise adjustment of the positioning of the lifting means when gripping the load.

Ainsi, les moyens de levage 4 comprenant le bras télescopique 9 sont déplaçable sur la course d selon un mouvement commandé et contrôlé de préférence hydrauliquement sous l'action de moyens de translation disposés au voisinage de l'axe de pivotement 10.Thus, the lifting means 4 comprising the telescopic arm 9 can be displaced over the stroke d according to a movement controlled and preferably controlled hydraulically under the action of translation means arranged in the vicinity of the pivot axis 10.

De préférence, les moyens d'actionnement hydrauliques comportent au moins un vérin hydraulique, dont la direction d'actionnement est sensiblement parallèle à l'axe de pivotement 10.Preferably, the hydraulic actuation means comprise at least one hydraulic cylinder, the actuation direction of which is substantially parallel to the pivot axis 10.

En référence à la figure 4, un chariot selon l'invention présente un diagramme de stabilité sans béquille correspondant à la levée d'une charge de 9000 N à une distance de 1 mètre en avant des roues avant : on obtient ainsi des performances équivalentes à ou meilleures que celles des chariots embarqués de l'art antérieur. En particulier, les chariots selon l'invention ont une portée à l'avant des roues notablement supérieure aux chariots de l'art antérieur.With reference to FIG. 4, a trolley according to the invention presents a stability diagram without a crutch corresponding to the lifting of a load of 9000 N at a distance of 1 meter in front of the front wheels: this gives performances equivalent to or better than those of on-board carriages of the prior art. In particular, the carriages according to the invention have a range at the front of the wheels significantly greater than the carts of the prior art.

La figure 5 représente un diagramme de stabilité avec béquille encore amélioré par rapport au diagramme de stabilité sans béquille de la figure 4 et par rapport aux caractéristiques des chariots embarqués de l'art antérieur, dans le cas où l'on équipe un chariot selon l'invention de stabilisateurs 16 rétractables aptes à venir en appui sur le sol en avant du point de contact P d'une roue avant 5 avec le sol.FIG. 5 represents a stability diagram with crutch further improved compared to the stability diagram without crutch of FIG. 4 and compared with the characteristics of the on-board carriages of the prior art, in the case where a carriage is fitted according to the invention of retractable stabilizers 16 capable of coming to bear on the ground in front of the point of contact P of a front wheel 5 with the ground.

Les stabilisateurs 16 rétractables aptes à venir en appui sur le sol en avant des points de contact des roues avant 5 avec le sol sont fixés sur le châssis 1 du chariot selon l'invention selon une manière connue en soi pour la fixation de stabilisateurs sur les chariots embarqués de l'art antérieur et commandés de manière analogue par un vérin d'actionnement exerçant une poussée sensiblement verticale.The retractable stabilizers 16 capable of coming to bear on the ground in front of the points of contact of the front wheels 5 with the ground are fixed to the chassis 1 of the trolley according to the invention in a manner known per se for the fixing of stabilizers on the on-board carriages of the prior art and controlled analogously by an actuating cylinder exerting a substantially vertical thrust.

En référence aux figures 6 à 8, un procédé de chargement d'un chariot selon l'invention et de solidarisation à un véhicule porteur comporte les étapes décrites ci-après.Referring to Figures 6 to 8, a method of loading a trolley according to the invention and securing to a carrier vehicle comprises the steps described below.

En référence à la figure 6, on allonge le bras télescopique d'une longueur de l'ordre de 20 cm, de manière à enfiler les fourches 13a, 13b dans des fourreaux 20 prévus à cet effet et solidarisés au véhicule porteur sous le plateau de celui-ci de préférence par des moyens d'accrochage à fixation rapide de type connus en soi. A l'arrière des fourreaux 20, des supports 21 sont disposés dans une position prédéterminée permettant le passage des fourches 13a, 13b et du bras télescopique 9 légèrement étendu entre les supports 21.With reference to FIG. 6, the telescopic arm is lengthened by a length of the order of 20 cm, so as to thread the forks 13a, 13b in sheaths 20 provided for this purpose and secured to the carrier vehicle under the platform. the latter preferably by quick-attach attachment means of a type known per se. At the rear of the sleeves 20, supports 21 are arranged in a predetermined position allowing the forks 13a, 13b and the slightly extended telescopic arm 9 to pass between the supports 21.

Après avoir enfilé les fourches dans les fourreaux 20, on effectue un mouvement combiné de montée et de pivotement du chariot autour du bras télescopique 9 jusqu'à la position représentée à la figure 7 dans laquelle le châssis 1 est entièrement soulevé du sol et incliné légèrement vers l'avant d'un angle compris entre 10 et 15 degrés d'angles sexagésimaux.After having threaded the forks into the sleeves 20, a combined movement of raising and pivoting of the carriage is carried out around the telescopic arm 9 to the position shown in FIG. 7 in which the chassis 1 is completely raised from the ground and inclined slightly forward at an angle between 10 and 15 degrees of sexagesimal angles.

A partir de la position de la figure 7, on rétracte complètement le bras télescopique 9, ce qui a pour effet de reposer le châssis 2 sur le support 21. On braque de préférence la roue directrice arrière 7 complètement à gauche ou complètement à droite, de manière à limiter le dépassement du chariot vers l'arrière du véhicule.From the position of FIG. 7, the telescopic arm 9 is completely retracted, which has the effect of resting the chassis 2 on the support 21. The rear steering wheel 7 is preferably turned completely to the left or completely to the right, so as to limit the protrusion of the carriage towards the rear of the vehicle.

Le chariot repose alors sous l'effet de son propre poids sur le support 21 sur lequel il est appliqué par le bras télescopique en position complètement rétractée : la position d'équilibre du chargement de la machine selon l'invention embarquée à l'arrière du véhicule porteur est parfaitement stable et permet le transport sur de longues distances.The carriage then rests under the effect of its own weight on the support 21 on which it is applied by the telescopic arm in the fully retracted position: the equilibrium position of the loading of the machine according to the invention on board the rear of the carrier vehicle is perfectly stable and allows transport over long distances.

Avantageusement, on prévoit un moyen de verrouillage complémentaire du chariot embarqué sur le véhicule porteur avec le support 21 solidaire du véhicule porteur. Ce moyen de verrouillage peut par exemple comporter deux verrous latéraux commandés directement au moyen d'une manette disposée dans le poste 2 de conduite et de commande du chariot. Ces verrous latéraux peuvent être des verrous mécaniques ou à commande hydraulique, ou encore à commande électrique. Dans une variante préférée, le moyen de verrouillage est commandé par l'arrêt du moteur du chariot ou l'interruption d'énergie électrique du chariot, ou l'interruption d'énergie hydraulique du chariot.Advantageously, provision is made for additional locking means for the carriage on board the carrier vehicle with the support 21 secured to the carrier vehicle. This locking means can for example comprise two lateral locks controlled directly by means of a lever arranged in the station 2 for driving and controlling the carriage. These lateral locks can be mechanical or hydraulically controlled, or electrically controlled locks. In a preferred variant, the locking means is controlled by stopping the motor of the carriage or the interruption of electrical energy of the carriage, or the interruption of hydraulic energy of the carriage.

L'invention décrite en référence à des modes de réalisation particuliers n'y est nullement limitée mais couvre au contraire toute modification de forme et toute variante de réalisation dans le cadre de l'esprit de l'invention : ainsi, le groupe motopropulseur 3 peut avantageusement être constitué par un groupe électrique fonctionnant sur batterie dans le cas d'applications interdisant l'emploi de moteurs thermiques.The invention described with reference to particular embodiments is in no way limited thereto, but on the contrary covers any modification of form and any variant of embodiment within the framework of the spirit of the invention: thus, the powertrain 3 can advantageously be constituted by an electric group operating on battery in the case of applications prohibiting the use of heat engines.

En référence à la figure 9, dans un premier mode de réalisation de l'invention, un piston 30 solidaire de l'axe de pivotement 10 du bras télescopique est schématisé par sa poutre principale 9. Le piston 30 délimite deux chambres 31a et 31b à l'intérieur d'une chemise 32. Un premier perçage 33a pratiqué sensiblement coaxialement à l'axe de pivotement 10 et un deuxième perçage 33b pratiqué sensiblement coaxialement à l'axe de pivotement 10 permettent l'alimentation respectivement de chaque chambre 31a ou 31b en fluide hydraulique.Referring to Figure 9, in a first embodiment of the invention, a piston 30 secured to the pivot axis 10 of the telescopic arm is shown schematically by its main beam 9. The piston 30 delimits two chambers 31a and 31b to inside a jacket 32. A first bore 33a made substantially coaxially with the pivot axis 10 and a second bore 33b made substantially coaxially with the pivot axis 10 allow the feeding of each chamber 31a or 31b respectively hydraulic fluid.

L'axe 10 est monté solidaire du châssis 1 par l'intermédiaire de deux pièces de montage 34a, 34b assemblées au châssis 1 par vissage, par exemple de vis non dépassantes 35a, 35b, ou par tout autre moyen permettant la mise en place de l'axe de pivotement 10 et le passage du piston 30 par un orifice de diamètre prévu à cet effet.The axis 10 is mounted integral with the chassis 1 by means of two mounting parts 34a, 34b assembled to the chassis 1 by screwing, for example of non-protruding screws 35a, 35b, or by any other means allowing the installation of the pivot axis 10 and the passage of the piston 30 through an orifice of diameter provided for this purpose.

La chemise 32 est obturée à ses extrémités par deux bagues de fermeture 38a, 38b portant des joints d'étanchéité appropriés, les bagues 38a, 38b étant fixées de manière connue en soi par vissage ou moyen équivalent.The jacket 32 is closed at its ends by two closing rings 38a, 38b carrying suitable seals, the rings 38a, 38b being fixed in a manner known per se by screwing or equivalent means.

La structure ainsi décrite présente une conformation en vérin à double tige, dans lequel le piston 30 est fixe et la chemise 32 se déplace dans un premier sens lorsque la chambre 31a est mise sous pression hydraulique et dans un deuxième sens opposé audit premier sens lorsque la chambre 31b est mise sous pression hydraulique.The structure thus described has a double rod cylinder conformation, in which the piston 30 is fixed and the jacket 32 moves in a first direction when the chamber 31a is put under hydraulic pressure and in a second direction opposite to said first direction when the chamber 31b is put under hydraulic pressure.

L'homme du métier peut ainsi déterminer sans difficulté une course de déplacement transversal d en fonction des dimensions internes de la chemise 32 et de la largeur du piston 30 restant immobile par rapport à l'axe de pivotement 10 et par rapport au châssis 1 du chariot élévateur.A person skilled in the art can thus easily determine a transverse displacement stroke d as a function of the internal dimensions of the jacket 32 and the width of the piston 30 remaining stationary relative to the pivot axis 10 and relative to the chassis 1 of the forklift.

Dans le déplacement imposé par la pression hydraulique introduite dans l'une ou l'autre chambre 31a ou 31b, la chemise 32 appuie par l'intermédiaire de l'une ou l'autre bague de fermeture 38b ou 38a sur des douilles d'appui 36b ou 36a. Chaque douille d'appui 36a ou 36b est solidaire d'une équerre 37a ou 37b qui est elle-même reliée à la poutre principale du bras élévateur télescopique du chariot selon l'invention.In the displacement imposed by the hydraulic pressure introduced into one or the other chamber 31a or 31b, the jacket 32 presses by means of one or the other closing ring 38b or 38a on support sockets 36b or 36a. Each support sleeve 36a or 36b is integral with a bracket 37a or 37b which is itself connected to the main beam of the telescopic lifting arm of the trolley according to the invention.

Ainsi, l'invention permet de réaliser de manière simple un déplacement latéral qui n'entrave pas le pivotement du bras télescopique, les moyens de déplacement latéral permettant simultanément le pivotement du bras télescopique autour de l'axe sensiblement horizontal 10.Thus, the invention makes it possible to carry out a lateral movement in a simple manner which does not hamper the pivoting of the telescopic arm, the lateral displacement means simultaneously allowing the pivoting of the telescopic arm around the substantially horizontal axis 10.

En référence à la figure 10, dans un autre mode de réalisation de l'invention, un piston 40 est solidaire de l'axe de pivotement 10 du bras télescopique schématisé par sa poutre principale 9. Le piston 40 délimite deux chambres 41a et 41b à l'intérieur d'une chemise 42. Pour éviter le perçage des orifices de diamètre réduit et de longueur importante 33a, 33b du mode de réalisation de la figure 9, on réalise deux orifices d'alimentation ou d'évacuation de fluides hydrauliques 43a, 43b directement dans la chemise 42. De tels orifices taraudés 43a, 43b d'alimentation en fluide hydraulique sont de type connu en soi et ne nécessitent pas de description plus détaillée.With reference to FIG. 10, in another embodiment of the invention, a piston 40 is integral with the pivot axis 10 of the telescopic arm shown diagrammatically by its main beam 9. The piston 40 delimits two chambers 41a and 41b at inside a jacket 42. To avoid drilling holes of reduced diameter and large length 33a, 33b of the embodiment of FIG. 9, two supply or discharge orifices for hydraulic fluids 43a are produced, 43b directly in the jacket 42. Such tapped orifices 43a, 43b for supplying hydraulic fluid are of a type known per se and do not require a more detailed description.

L'axe 10 est monté solidaire du châssis 1 par l'intermédiaire de deux pièces de montage 44a, 44b assemblées au châssis 1 par exemple par vissage, de vis non dépassantes 45a, 45b, ou par tout autre moyen permettant la mise en place de l'axe de pivotement 10 et le passage du piston 40 par un orifice de diamètre prévu à cet effet.The axis 10 is mounted integral with the chassis 1 by means of two mounting parts 44a, 44b assembled to the chassis 1 for example by screwing, of non-protruding screws 45a, 45b, or by any other means allowing the installation of the pivot axis 10 and the passage of the piston 40 through an orifice of diameter provided for this purpose.

La chemise 42 est obturée à ses extrémités par deux bagues de fermeture 48a, 48b portant des joints d'étanchéité appropriés, les bagues 48a, 48b étant fixées de manière connue en soi par vissage ou moyen équivalent.The jacket 42 is closed at its ends by two closing rings 48a, 48b carrying suitable seals, the rings 48a, 48b being fixed in a manner known per se by screwing or equivalent means.

La structure ainsi décrite présente une conformation en vérin à double tige, dans lequel le piston 40 est fixe et la chemise 42 se déplace dans un premier sens lorsque la chambre 41a est mise sous pression hydraulique et dans un deuxième sens opposé audit premier sens lorsque la chambre 41b est mise sous pression hydraulique.The structure thus described has a double rod cylinder conformation, in which the piston 40 is fixed and the jacket 42 moves in a first direction when the chamber 41a is pressurized hydraulic and in a second direction opposite to said first direction when the chamber 41b is put under hydraulic pressure.

L'homme du métier peut ainsi déterminer sans difficulté une course de déplacement transversal d en fonction des dimensions internes de la chemise 42 et de la largeur du piston 40 restant immobile par rapport à l'axe de pivotement 10 et par rapport au châssis 1 du chariot élévateur.A person skilled in the art can thus easily determine a transverse displacement stroke d as a function of the internal dimensions of the jacket 42 and the width of the piston 40 remaining stationary relative to the pivot axis 10 and relative to the chassis 1 of the forklift.

Dans le déplacement imposé par la pression hydraulique introduite dans l'une ou l'autre chambre 41a ou 41b, la chemise 42 appuie par l'intermédiaire de l'une ou l'autre bague de fermeture 48b ou 48a sur des douilles d'appui 46b ou 46a. Chaque douille d'appui 46a ou 46b est solidaire d'une équerre 47a ou 47b qui est elle-même reliée à la poutre principale du bras élévateur télescopique du chariot selon l'invention.In the displacement imposed by the hydraulic pressure introduced into one or the other chamber 41a or 41b, the jacket 42 presses via one or the other closing ring 48b or 48a on support sockets 46b or 46a. Each support sleeve 46a or 46b is integral with a bracket 47a or 47b which is itself connected to the main beam of the telescopic lifting arm of the trolley according to the invention.

Ainsi, l'invention permet de réaliser de manière simple un déplacement latéral qui n'entrave pas le pivotement du bras télescopique, les moyens de déplacement latéral permettant simultanément le pivotement du bras télescopique autour de l'axe sensiblement horizontal 10.Thus, the invention makes it possible to carry out a lateral movement in a simple manner which does not hamper the pivoting of the telescopic arm, the lateral displacement means simultaneously allowing the pivoting of the telescopic arm around the substantially horizontal axis 10.

L'invention bien que décrite en référence à deux modes de réalisation particuliers n'y est nullement limitée, mais couvre au contraire toute modification de forme et toute variante de réalisation dans le cadre et l'esprit de l'invention, notamment toute variante dans lesquelles le pivotement et le déplacement transversal peuvent être assurés coaxialement à l'axe de pivotement 10.The invention, although described with reference to two particular embodiments, is in no way limited thereto, but on the contrary covers any modification of form and any variant of embodiment within the scope and spirit of the invention, in particular any variant in which the pivoting and the transverse displacement can be ensured coaxially with the pivot axis 10.

Claims (17)

Chariot de manutention motorisé (3), apte à être embarqué à l'arrière d'un véhicule porteur, du genre comportant un châssis (1) présentant une conformation en U, équipé de deux roues avant et d'une roue arrière directrice, un poste de conduite (2) et des moyens de levage (4), caractérisé en ce que les moyens de levage (4) comportent un bras télescopique (9) monté à pivotement sous l'action d'un vérin de levage (14) autour d'un axe (10) sensiblement horizontal situé à l'arrière du châssis (1) sensiblement au-dessus de ladite roue arrière directrice (7).Motorized handling trolley (3), capable of being loaded at the rear of a carrier vehicle, of the type comprising a chassis (1) having a U-shaped configuration, equipped with two front wheels and a steerable rear wheel, a driving position (2) and lifting means (4), characterized in that the lifting means (4) comprise a telescopic arm (9) pivotally mounted under the action of a lifting cylinder (14) around a substantially horizontal axis (10) located at the rear of the chassis (1) substantially above said rear steering wheel (7). Chariot selon la revendication 1, caractérisé en ce que le poste de conduite (2) est situé sur un côté du chariot, le groupe motopropulseur (3) est situé du côté opposé au poste de conduite (2) et le bras télescopique (9) dans sa position abaissée et rétractée correspondant au transport d'une charge passe entre le poste de conduite (2) et le groupe motopropulseur (3).Trolley according to claim 1, characterized in that the driving position (2) is located on one side of the trolley, the drive train (3) is located on the side opposite the driving position (2) and the telescopic arm (9) in its lowered and retracted position corresponding to the transport of a load passes between the driving position (2) and the powertrain (3). Chariot selon la revendication 1 ou la revendication 2, caractérisé en ce que le bras télescopique porte à son extrémité éloignée de l'axe de pivotement (10) un organe de préhension (11) orientable à pivotement autour d'un axe horizontal (12) sous l'action d'un vérin d'actionnement.Trolley according to claim 1 or claim 2, characterized in that the telescopic arm carries at its end remote from the pivot axis (10) a gripping member (11) which can be pivotally pivoted about a horizontal axis (12) under the action of an actuating cylinder. Chariot selon l'une des revendications précédentes, caractérisé en ce que le bras télescopique porte à son extrémité éloignée de l'axe de pivotement (10) un tablier (11) supportant des fourches (13a, 13b).Trolley according to one of the preceding claims, characterized in that the telescopic arm carries at its end remote from the pivot axis (10) an apron (11) supporting forks (13a, 13b). Chariot selon la revendication 4, caractérisé en ce que le bras télescopique (9) équipé d'un tablier (11) supportant des fourches (13a, 13b) est soumis à l'action d'un vérin (15) de compensation, de manière à maintenir les fourches horizontales (13a, 13b).Trolley according to claim 4, characterized in that the telescopic arm (9) equipped with an apron (11) supporting forks (13a, 13b) is subjected to the action of a jack (15) for compensation, so maintaining the horizontal forks (13a, 13b). Chariot selon l'une des revendications précédentes, caractérisé en ce que le châssis (1) porte des stabilisateurs (16) rétractables aptes à venir en appui sur le sol en avant des points de contact des roues avant (5, 6) avec le sol.Trolley according to one of the preceding claims, characterized in that the chassis (1) carries retractable stabilizers (16) capable of coming to bear on the ground in front of the points of contact of the front wheels (5, 6) with the ground . Chariot selon la revendication 5, caractérisé en ce que le vérin de levage (14) et le vérin de compensation (15) sont montés de part et d'autre de la poutre du bras télescopique (9).Trolley according to claim 5, characterized in that the lifting cylinder (14) and the compensation cylinder (15) are mounted on either side of the beam of the telescopic arm (9). Chariot selon l'une des revendications précédentes, caractérisé en ce que le chariot comporte un moyen de verrouillage du chariot embarqué sur le véhicule porteur avec un support (21) solidaire du véhicule porteur.Trolley according to one of the preceding claims, characterized in that the trolley comprises means for locking the trolley on board the carrier vehicle with a support (21) secured to the carrier vehicle. Chariot selon la revendication 8, caractérisé en ce que ledit moyen de verrouillage est commandé directement à partir du poste de conduite (2) du chariot.Trolley according to claim 8, characterized in that said locking means is controlled directly from the driving position (2) of the trolley. Chariot selon la revendication 8 ou la revendication 9, caractérisé en ce que le moyen de verrouillage est commandé sur arrêt du moteur (3) du chariot.Trolley according to claim 8 or claim 9, characterized in that the locking means is controlled on stopping the motor (3) of the trolley. Chariot de manutention motorisé, à bras télescopique, comprenant un châssis monté sur une pluralité de roues dont l'une au moins est motrice, ledit châssis portant un groupe motopropulseur, une cabine et des moyens de levage disposés entre le groupe motopropulseur et la cabine, lesdits moyens de levage comprenant ledit bras télescopique monté à pivotement autour d'un axe sensiblement horizontal, caractérisé en ce que l'ensemble des moyens de levage (4) comprenant le bras télescopique (9) est déplaçable transversalement, de manière à permettre un réglage précis sur une distance prédéterminé (d) du positionnement des moyens de levage en vue de la préhension de la charge.Motorized handling trolley, with telescopic arm, comprising a chassis mounted on a plurality of wheels, at least one of which is driving, said chassis carrying a powertrain, a cabin and lifting means arranged between the powertrain and the cabin, said lifting means comprising said telescopic arm pivotally mounted about a substantially horizontal axis, characterized in that all of the lifting means (4) comprising the telescopic arm (9) can be moved transversely, so as to allow adjustment precise over a predetermined distance (d) of the positioning of the lifting means for gripping the load. Chariot selon la revendication 11, caractérisé en ce que le bras télescopique (9) est déplaçable transversalement sur son axe (10) de pivotement sous l'action de moyens d'actionnement disposés au voisinage dudit axe (10) de pivotement.Trolley according to claim 11, characterized in that the telescopic arm (9) can be moved transversely on its pivot axis (10) under the action of actuating means arranged in the vicinity of said pivot axis (10). Chariot selon la revendication 12, caractérisé en ce que lesdits moyens d'actionnement sont des moyens d'actionnement hydraulique comportant au moins un vérin hydraulique dont la direction d'actionnement est sensiblement parallèle à l'axe (10) de pivotement du bras télescopique (9).Trolley according to claim 12, characterized in that said actuation means are hydraulic actuation means comprising at least one hydraulic cylinder whose actuation direction is substantially parallel to the pivot axis (10) of the telescopic arm ( 9). Chariot selon la revendication 12 ou la revendication 13, caractérisé en ce que les moyens d'actionnement sont pratiquement coaxiaux à l'axe (10) de pivotement du bras télescopique (9).Trolley according to claim 12 or claim 13, characterized in that the actuating means are practically coaxial with the pivot axis (10) of the telescopic arm (9). Chariot selon l'une quelconque des revendications 12 à 14, caractérisé en ce que les moyens d'actionnement sont à double effet.Trolley according to any one of Claims 12 to 14, characterized in that the actuation means are double-acting. Chariot selon l'une quelconque des revendications 12 à 15, caractérisé en ce que les moyens d'actionnement sont des moyens hydrauliques alimentés par des orifices sensiblement parallèles ou coaxiaux à l'axe de pivotement (10).Trolley according to any one of claims 12 to 15, characterized in that the actuation means are hydraulic means supplied by orifices substantially parallel or coaxial with the pivot axis (10). Chariot selon l'une quelconque des revendications 12 à 15, caractérisé en ce que les moyens d'actionnement sont des moyens hydrauliques alimentés par des orifices sensiblement orthogonaux à l'axe de pivotement (10).Trolley according to any one of claims 12 to 15, characterized in that the actuation means are hydraulic means supplied by orifices substantially orthogonal to the pivot axis (10).
EP95402069A 1994-09-14 1995-09-13 Motorised lift truck with telescopic arm Expired - Lifetime EP0701963B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9410953A FR2724374B1 (en) 1994-09-14 1994-09-14 MOTORIZED HANDLING TROLLEY SUITABLE FOR EMBEDDING AT THE BACK OF A CARRIER VEHICLE
FR9410953 1994-09-14
FR9500033A FR2728884A1 (en) 1995-01-04 1995-01-04 Fork lift truck designed to fit onto back of lorry
FR9500033 1995-01-04

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EP0701963A1 true EP0701963A1 (en) 1996-03-20
EP0701963B1 EP0701963B1 (en) 1998-02-04
EP0701963B2 EP0701963B2 (en) 2004-08-18

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EP (1) EP0701963B2 (en)
CA (1) CA2158232C (en)
DE (2) DE701963T1 (en)

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Also Published As

Publication number Publication date
US5813821A (en) 1998-09-29
CA2158232C (en) 2001-08-07
DE701963T1 (en) 1996-12-12
DE69501578D1 (en) 1998-03-12
DE69501578T2 (en) 1998-09-17
CA2158232A1 (en) 1996-03-15
DE69501578T3 (en) 2005-02-03
EP0701963B1 (en) 1998-02-04
EP0701963B2 (en) 2004-08-18

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