EP1151959B1 - Chariot élévateur avec un mât extensible - Google Patents

Chariot élévateur avec un mât extensible Download PDF

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Publication number
EP1151959B1
EP1151959B1 EP01660081A EP01660081A EP1151959B1 EP 1151959 B1 EP1151959 B1 EP 1151959B1 EP 01660081 A EP01660081 A EP 01660081A EP 01660081 A EP01660081 A EP 01660081A EP 1151959 B1 EP1151959 B1 EP 1151959B1
Authority
EP
European Patent Office
Prior art keywords
mast
carriage
wheel
power transmission
support structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01660081A
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German (de)
English (en)
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EP1151959A1 (fr
Inventor
Janne Polvilampi
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.)
Mitsubishi Logisnext Europe Oy
Original Assignee
Rocla Oy
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Filing date
Publication date
Application filed by Rocla Oy filed Critical Rocla Oy
Publication of EP1151959A1 publication Critical patent/EP1151959A1/fr
Application granted granted Critical
Publication of EP1151959B1 publication Critical patent/EP1151959B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/205—Arrangements for transmitting pneumatic, hydraulic or electric power to movable parts or devices
    • 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
    • B66F9/08—Masts; Guides; Chains

Definitions

  • the invention relates to a mast truck according to the preamble of the appended claim 1.
  • the invention relates to reach trucks meant for warehouse operations, said trucks being used for transporting containers, boxes and similar items to warehouse racks and for unpacking said items from the racks.
  • reach trucks meant for warehouse operations, said trucks being used for transporting containers, boxes and similar items to warehouse racks and for unpacking said items from the racks.
  • the features required of these trucks are agility in operation, small size, particularly small dimensions in the moving direction of the machine, and good visibility for the driver.
  • a mast truck suitable for warehouse operation is a truck moving on at least three wheels and provided with a mast structure comprising a fixed mast structure, as well as two movable carriages and a lifting carriage.
  • the mast and carriages are rectangular structures formed of vertical profiles and transversal supports welded thereon.
  • the mast is connected to the truck either in stationary fashion or so that it can be inclined around an axis.
  • Inside the mast there is arranged a moving carriage, an intermediate carriage that moves vertically along the mast profiles by intermediation of guiding wheel bearings.
  • Inside the intermediate carriage there is arranged another moving carriage that moves with respect to the intermediate carriage by intermediation of guiding wheel bearings.
  • the lifting carriage moves in a similar way with respect to the top carriage. Hydraulic cylinders are generally used for lifting and lowering the carriages.
  • the lifting carriage In the first operational step of the mast truck, i.e. the free lifting step, the lifting carriage is lifted to the top end of the top carriage, and in the next step, the lifting step proper, the intermediate carriage
  • Known free-lifting mast trucks generally include at least three lifting jacks, two at the sides of the mast structure and one in the middle, in which case both the middle jack and the side jacks obstruct the driver's range of vision when the driver is sitting behind the mast structure.
  • Other elements obstructing the view are the power transmission means of the jacks, pipes connecting the hydraulic cylinders and tubes required by various auxiliary devices.
  • the critical measure is the length of the mast truck.
  • 'mast truck length means its length dimension in the driving direction.
  • the object of the invention is to reduce the length of a reach truck, and thus also to reduce the truck's turning radius, and to improve the visibility through the mast structure while keeping the power torques in balance.
  • the object of the invention is achieved by realizing the lifting operation of the truck by means of two jacks that are placed in the transversal direction of the truck, i.e. transversally to the driving direction, at the sides of the mast structure, and by turning the power transmission wheel provided at the end of the free-lifting jack for 90°, so that the direction of its axis is perpendicular to the driving direction.
  • the power transmission wheels attached to the upper structure of the intermediate carriage are arranged, with respect to each other and the axis of symmetry, so that a balance of torque is achieved.
  • the power transmission means can be aligned, so that the blind areas are minimized.
  • the tubes required by the auxiliary devices can be arranged so that they do not obstruct the view.
  • An essential factor for reducing the length of the mast truck and for minimizing the blind areas is the placing of two jacks at the sides of the mast structure and the turning of the power transmission wheel, located at the free end of the free-lifting jack piston, to be parallel with the driving direction, so that the wheel surface is turned by 90°.
  • the direction of the power transmission wheel located at the free end of the free-lifting jack requires that the power transmission band is respectively turned for 90° before it reaches the transmission wheel at the fixed end of the jack. This is arranged by means of a band turning element which is arranged in said band, in the section between said wheels.
  • the power transmission wheels attached to the upper structure of the intermediate jack can be arranged, with respect to each other and to the symmetry axis, so that during the lifting step the power transmission chains passing through the power transmission wheels create power torques that are in balance. This is something that a man skilled in the art can do on the basis of his experience.
  • the tube or tubes of the mast truck can be arranged to proceed outside the driver's field of vision, mainly along the same path as the power transmission chains.
  • the embodiment illustrated in the drawings represents a mast structure that is attached to the truck.
  • the truck housing is supported by at least three wheels, at least one of which is a traction wheel.
  • FIG 1a there are seen three separate mast sections I, II and III that are roughly of the same height.
  • the mast sections In the width direction of the truck, the mast sections are installed in a telescoping fashion and connected slidably to each other.
  • Each section I, II, III of the mast structure is made of vertical profile pairs 10, 11 and respectively 12, which are welded together at the bottom and top ends by means of transversal supports 4 and 5, 6 and 7, and respectively 8 and 9.
  • the mast I is connected to the truck either in a stationary fashion or so that it can be inclined in the direction of the lengthwise axis of the truck, i.e. in the driving direction.
  • the middle mast section is the intermediate carriage II that moves vertically by intermediation of guide wheel bearings with respect to the profiles 10 of the mast section I.
  • the innermost mast section is the top carriage III, which moves in similar fashion in the profiles 11 of the intermediate carriage II.
  • the lifting carriage is realized in the form of a fork lift 19, figure 6, and it moves with respect to the top carriage III.
  • the profiles 12 and 11 of the top and intermediate carriage III, II, as well as the profiles 10 of the mast I are I-profiles.
  • the profiles of the mast I can be U-profiles.
  • the mast structure, figure 1a comprises two hydraulic cylinders, 14 and 20.
  • the cylinders operate in two steps.
  • the first operation step is carried out by the free-lifting jack 14, which lifts the fork lift 19 to the top end III of the fork lift 19, whereafter another lifting jack 20 pushes the intermediate carriage II upwards in the vertical direction.
  • the free-lifting jack 14 is attached to the top support 7 of the intermediate carriage, in which case the piston 14 m thereof performs a downwardly thrusting direction and shifts the fork lift 19 to the top end of the top carriage III, figure 3.
  • the motion of the piston is transmitted by means of power transmission elements comprising a chain 29, a chain wheel 13 located at the free end of the piston 14 m of the free-lifting jack, a chain turning element 15, figure 7, chain wheels 16 and 17 attached to the top support 7 of the intermediate carriage II and a chain wheel 18 attached to the top support structure 9 of the top carriage III.
  • a chain turning element 15 that turns the chain coming from the chain wheel 13 by 90° with respect to its lengthwise axis, so that the chain enters the chain wheel in the correct position, i.e. at an angle of 90° with respect to the chain wheel 1, figure 6.
  • the chain 29 is fixedly attached to the mast top support structure 5, of which the cut sections 5 are illustrated in the drawings.
  • the chain passes around the chain wheel 13 located at the free end of the piston 14 m of the free-lifting jack 14, around the chain wheels 16 and 17 located in the top support structure 7 of the intermediate carriage II and via the chain wheel 18 located in the top support structure 9 of the top carriage III to the fork lift 19.
  • the chain alignment has been selected so that it causes a minimal blind area, figure 1a.
  • One end of the chain 25 is attached to the top support structure 5 of the mast I and proceeds via the chain wheel 21 to the bottom support structure 8 of the top carriage III.
  • the chain wheel 21 is turned by 90° with respect to the chain wheels 16 and 17, figure 6, so that its axis is transversal to the truck driving direction.
  • One end of the chain 26 is attached to the top support structure of the mast I and proceeds over the chain wheels 22 and 23, attached to the top support structure 7 of the intermediate carriage II, to the bottom support structure 8 of the top carriage, being attached thereto at the other end, figures 2 and 3.
  • the fastening points of the bottom ends of the chains 25 and 26 in the bottom support structure 8 of the top carriage III are arranged so that in the bottom position of the mast, the chain alignments proceed between the profiles 10 and 12, so that the blind area is minimal.
  • the fastening points of the top ends of the chains 25 and 26 in the top support structure 5 of the mast I are asymmetric with respect to the central axis A-A, figure 1c. Hence the asymmetric positioning of the chain wheels 21 and 22, 23 causes a clockwise torque for the intermediate carriage II.
  • the chain wheel 21 fits in a small space transversally to the driving direction, and does not increase the blind area in the driver's view.
  • the fastening points of the ends of the chain 25 in the top support structure of the mast I and respectively in the bottom support structure 8 of the top carriage III are located directly underneath the chain wheel 21, and consequently do not enlarge the blind area.
  • the chain 2 in turn is at one end attached to the top support structure 5 of the mast I, mainly at the same distance from the central axis A-A of the mast I as the chain 25, and it passes around the chain wheels 22 and 23 attached to the top support structure of the intermediate carriage II to the bottom support structure 8 of the top carriage, to outside the second jack with respect to the central axis A-A of the mast truck, according to figures 1a, 2 and 3.
  • the asymmetric positioning of the chain wheels 21, 22 and 23 causes in the intermediate carriage a torque in the opposite direction.
  • the chain 26 passes over both wheels 22, 23.
  • the chain wheels 22 and 23 can also be replaced by a single chain wheel with a larger diameter than the wheels 22 and 23, figure 8.
  • the bottom end of the jack 20 that performs the second step in the lifting operation is attached to the mast structure I, and the top end thereof is attached to the top support structure 7 of the intermediate carriage II.
  • the jacks 1 and 20 are hydraulically coupled in series by means of a pipe 2, figure 5.
  • the area of the piston 14 m of the jack 1 is larger or at least equal to the area of the piston 20 m of the jack 20.
  • the ratio of the areas is utilized for controlling the order of the operation of the jacks, so that the free-lifting jack is operated first owing to its smaller weight level.
  • the length proceeded by the fork lift is doubled with respect to the length proceeded by the chain wheel 1.
  • the chain turning element 15 has proceeded to the vicinity of the chain wheel 1 attached to the piston 14 m of the free-lifting jack.
  • the chain wheels 16 and 17 cause a counterclockwise torque in the top support structure of the intermediate carriage II.
  • the piston 20 m of the lifting jack 20 moves upwards, at the same time moving the intermediate carriage II and the free-lifting jack 14 attached thereto, in the proportion 1:1 of the motional lengths.
  • the chain wheels 21, 22 and 23 attached to the top support structure of the intermediate carriage II transmit the stroke of the piston 20 m of the lifting jack 20 to the top carriage III, thus lifting the carriage to the top position.
  • the asymmetric alignment of the power transmission chains 25 and 26 causes a clockwise torque in the intermediate carriage II, and thus balances the counterclockwise torque created during the first step of the lifting operation.
  • the chain turning element 15 has moved to the vicinity of the chain wheel 1, located in the top structure of the intermediate carriage II, figure 2.
  • the chain turning element 15 moves back and forth between the extreme position of the initial position, located near the chain wheel 16, to the extreme position according to the truck working position, which is situated near the chain wheel 13.
  • the controlling of the tubes 27, figure 3 can be realized so that it causes as little blind area as possible.
  • the tubes are fixedly attached to the top support structure 5 of the mast I, wherefrom they pass via the chain 13, 16, via the tube wheel 28 and the chain wheel 18 to the fork lift 19.
  • the tubes proceed in parallel with the chain 29, but at the chain wheel 16 they proceed over it, while the chain 29 passes underneath; then they pass underneath the tube wheel 28 attached to the top support structure 7 of the intermediate carriage II, so that they are directed on top of the free-lifting chain 29 according to figure 2.
  • the minimum length of the mast structure is formed of the dimensions of the profiles 10, 11 and 12.
  • the length of the mast structure according to the above described embodiment is formed, in addition to the profiles 10, 11 and 12, of the width of the power transmission chain 25, figure 5.
  • the space taken up by the chain 29 in the lengthwise direction of the mast can be reduced by shifting the location of the free-lifting jack 14 somewhat forward in the proceeding direction of the truck. Therefore the profiles 10, 11 and 12 are worked at the top end, so that the chain wheels 16, 17 and 18 can be placed in line with the free-lifting jack.
  • extendable mast structure specified above comprising two moving carriages, is not restricted to the figures and described embodiments exclusively, but it can be modified within the scope of the appended claims and according to the know-how of a man skilled in the art.

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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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (7)

  1. Camion à mât, particulièrement un camion de portée conçu pour des opérations d'entreposage, comprenant
    une structure de mât comprenant un mât fixe (I) et au moins deux chariots mobiles (II et III), dont l'un est un chariot intermédiaire (II) et mobile verticalement par rapport au mât fixe (I), et l'autre est un chariot supérieur (III) et mobile verticalement le long du chariot intermédiaire (II) et comprenant en outre un chariot de levage (19), qui est supporté par le chariot supérieur (III) et mobile verticalement le long du chariot supérieur ;
    deux vérins hydrauliques (14, 20) destinés à déplacer les chariots (19, II, III), dont le premier est un vérin de levage libre (14), forçant le chariot de levage (19) à être décalé vers l'extrémité supérieure du chariot intermédiaire (II) et dont le deuxième est un vérin de levage (20), forçant le chariot intermédiaire (II) et le chariot supérieur (III) à être décalés vers leurs positions supérieures, alors que le vérin de levage libre (14) est disposé pour fonctionner le premier, et le vérin de levage (20) est disposé pour fonctionner par la suite ;
    et des éléments de transmission de puissance en forme de bande (29, 25, 26) passant à travers des roues de transmission (13, 16, 17, 18, 21, 22, 23) et qui transmettent les mouvements de poussée des pistons des vérins (14m, 20m) aux chariots (II, III, 19) ;
    afin que le premier élément de transmission de puissance en forme de bande (29), qui est disposé pour transmettre le mouvement de poussée du piston (14m) du vérin de levage libre, soit fixé au niveau d'une extrémité à la structure de support supérieure (5) du mât fixe (I), passe autour de la roue (13) située au niveau de l'extrémité libre du piston (14m) du vérin de levage libre (14) et passe en outre autour des roues (16, 17), fixées à la structure de support supérieure (7) du chariot intermédiaire (II), avançant sur la roue la plus à l'extérieur (16) et en dessous de la roue la plus à l'intérieur (17) et en outre sur la roue (18) située dans la structure de support supérieure (9) du chariot supérieur (III), d'où il continue vers le chariot de levage, auquel son autre extrémité est fixée ;
    le deuxième élément de transmission de puissance en forme de bande (26), qui est agencé pour transmettre le mouvement de poussée du piston du vérin de levage (20m) est fixé au niveau d'une extrémité à la structure de support supérieure (7) du mât (I), passe sur au moins une roue (22, 23) fixée à la structure de support supérieure (7) du chariot intermédiaire (II), d'où il continue vers la structure de support inférieure (8) du chariot supérieur (III), à laquelle il est fixé ; et
    un troisième élément de transmission de puissance en forme de bande (25), qui est également agencé pour transmettre le mouvement de poussée du piston du vérin de levage (20m), est fixé au niveau d'une extrémité à la structure de support supérieure (5) du mât (I), passe autour de la roue (21) fixée à la structure de support supérieure (7) du chariot intermédiaire (II) et avance vers la structure de support inférieure (8) du chariot supérieur (III), où il est fixé, au niveau d'un point qui est situé à la même distance de l'axe de symétrie (A - A) du camion à mât que le point de fixation de l'autre élément de transmission de puissance en forme de bande (26), mais du côté opposé dudit axe de symétrie (A - A) ;
    auquel cas les alignements des éléments de transmission de puissance en forme de bande sont choisis afin d'atteindre un équilibre entre les couples opposés créés ainsi pendant les étapes opérationnelles du camion à mât, caractérisé en ce que
    le vérin de levage libre (14) et le vérin de levage (20) sont tous les deux situés sensiblement sur le même niveau du camion à mât qui est transversal à la direction de mouvement du camion à mât, un d'un côté et l'autre de l'autre côté du camion à mât ;
    en ce que l'axe de la roue (13) située au niveau de l'extrémité du vérin de levage libre (14) est transversal à la direction d'avancée du camion ; en ce que dans le premier élément de transmission de puissance en forme de bande (29), est disposé un élément de tournage de bande (15) afin de tourner l'élément de transmission de puissance de 90° autour de son axe dans le sens de la longueur le long d'une distance entre ladite roue (13) située au niveau de l'extrémité du vérin de levage libre (14), et ladite roue la plus à l'extérieur (16) fixée à la structure de support supérieure (7) du chariot intermédiaire (II) ;
    et en ce que le piston du vérin de levage (20m) est disposé pour se déplacer vers le haut.
  2. Camion à mât selon la revendication 1, caractérisé en ce que les éléments de transmission de puissance en forme de bande (29, 26, 25) destinés à transmettre le mouvement de poussée des pistons de levage (14m, 20m) sont des chaínes.
  3. Camion à mât selon la revendication 1 ou 2, caractérisé en ce que les vérins hydrauliques (14, 20) sont couplés en série au moyen d'un tuyau (24).
  4. Camion à mât selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les roues (16, 17, 22, 23, 21) entourées par les éléments de transmission de puissance en forme de bande (29, 26, 25), lesdites roues étant placées dans la structure de support supérieure (7) du chariot intermédiaire (II), sont situées par rapport à la direction d'avancée du camion, à angles droits par rapport à l'axe de symétrie (A-A) de la structure de mât, afin que les couples de puissance créés pendant l'étape opérationnelle du camion soient principalement équilibrés.
  5. Camion à mât selon la revendication 4, caractérisé en ce que le diamètre de la roue (32) entourée par le deuxième élément de transmission de puissance en forme de bande (26), ladite roue étant placée dans la structure de support supérieure (7) du chariot intermédiaire (II), est tellement grand que le couple de puissance dans le sens des aiguilles d'une montre créé par l'élément de transmission de puissance pendant l'étape opérationnelle du camion à mât est capable d'équilibrer les couples dans le sens inverse des aiguilles d'une montre des premier et troisième éléments de transmission de puissance (29, 25).
  6. Camion à mât selon la revendication 5, caractérisé en ce que la roue entourée par le deuxième élément de transmission de puissance en forme de bande (26), ladite roue étant située dans la structure de support supérieure (5) du chariot intermédiaire (II), est remplacée par deux roues adjacentes (22, 23) présentant des diamètres plus petits, alors que l'élément (26) passe sur les deux roues (22, 23).
  7. Camion à mât selon l'une quelconque des revendications précédentes, caractérisé en ce que le tube (27) ou des tubes requis par des dispositifs auxiliaires sont disposés pour avancer le long de la même route que la bande de transmission de puissance (29) du vérin de levage libre (14), mais afin que pendant que la bande de transmission de puissance (29) passe autour des roues (16, 17) fixées à la structure de support supérieure (7) du chariot intermédiaire (II), sur la roue extérieure (16) et en dessous de la roue intérieure (17), le tube (27) passe uniquement sur la roue extérieure (16) et avance vers une roue à tube (28) fixée à la structure de support supérieure (7) du chariot intermédiaire (II), passant en dessous de ladite roue et en outre sur la roue fixée à la structure de support supérieure du chariot supérieur (III), alors que la roue à tube (28) est située au-dessus des deux roues (16, 17) entourées par l'élément de transmission de puissance (29), transversalement à la direction d'entraínement, sur ce côté de la roue (18) placée dans la structure supérieure (9) du chariot supérieur (III) qui tombe du côté du vérin de levage libre (14).
EP01660081A 2000-05-04 2001-05-03 Chariot élévateur avec un mât extensible Expired - Lifetime EP1151959B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20001039A FI108222B (fi) 2000-05-04 2000-05-04 Mastotrukki
FI20001039 2000-05-04

Publications (2)

Publication Number Publication Date
EP1151959A1 EP1151959A1 (fr) 2001-11-07
EP1151959B1 true EP1151959B1 (fr) 2004-10-13

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EP01660081A Expired - Lifetime EP1151959B1 (fr) 2000-05-04 2001-05-03 Chariot élévateur avec un mât extensible

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EP (1) EP1151959B1 (fr)
AT (1) ATE279372T1 (fr)
DE (1) DE60106319D1 (fr)
FI (1) FI108222B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9878887B2 (en) 2009-01-20 2018-01-30 Clark Material Handling Company Upright for a lift truck
US8434598B2 (en) * 2009-01-20 2013-05-07 Clark Material Handling Company Carpet pole carriage assembly
CN105152085B (zh) * 2015-09-21 2017-06-06 太原科技大学 一种叉车门架锁止机构
CN211110874U (zh) * 2017-03-09 2020-07-28 海斯特-耶鲁集团有限公司 用于叉车的桅杆
CN111232890A (zh) * 2020-02-12 2020-06-05 燕山大学 一种电动叉车卷扬举升门架系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1287806A (en) * 1969-02-09 1972-09-06 Dso Balkancar Improvements in or relating to high lift trucks
JPS5326384B2 (fr) * 1972-07-25 1978-08-02
GB2236091B (en) * 1989-09-12 1993-08-25 Lansing Linde Ltd Lift trucks and extensible mast structures therefor

Also Published As

Publication number Publication date
FI108222B (fi) 2001-12-14
EP1151959A1 (fr) 2001-11-07
DE60106319D1 (de) 2004-11-18
ATE279372T1 (de) 2004-10-15

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