EP0528072B1 - Plateforme de levage - Google Patents

Plateforme de levage Download PDF

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Publication number
EP0528072B1
EP0528072B1 EP19910122043 EP91122043A EP0528072B1 EP 0528072 B1 EP0528072 B1 EP 0528072B1 EP 19910122043 EP19910122043 EP 19910122043 EP 91122043 A EP91122043 A EP 91122043A EP 0528072 B1 EP0528072 B1 EP 0528072B1
Authority
EP
European Patent Office
Prior art keywords
levers
lifting platform
drive
lifting
platform according
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.)
Revoked
Application number
EP19910122043
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German (de)
English (en)
Other versions
EP0528072A1 (fr
Inventor
Klaus Dipl.-Ing. Duchmann
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.)
Hymo AB
Original Assignee
Hymo AB
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Publication date
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Priority claimed from EP91113772A external-priority patent/EP0528063A1/fr
Application filed by Hymo AB filed Critical Hymo AB
Priority to EP19910122043 priority Critical patent/EP0528072B1/fr
Publication of EP0528072A1 publication Critical patent/EP0528072A1/fr
Application granted granted Critical
Publication of EP0528072B1 publication Critical patent/EP0528072B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration

Definitions

  • the invention relates to a lifting platform for raising, lowering and adjusting the height of loads, with a base frame, with a platform, with a lifting scissor device for connecting the base frame and platform and with a drive for changing the position of the lifting scissor device according to the preamble of the claim 1.
  • the drive contains a spindle which extends between two adjacent legs in the lifting scissors.
  • a sprocket with tangential cams is provided as a cam which can be operated by means of a force, e.g. a piston rod, is moved and pivoted by rolling the sprocket on a chain.
  • a force e.g. a piston rod
  • lifts are relatively expensive because of their drive construction. If it is possible to manufacture lifts relatively inexpensively, these lifts could be used, for example, as part of work tables or assembly lines.
  • the invention is therefore based on the object of providing a lifting platform which can be produced relatively inexpensively and is robust in construction in order to be used in a wide variety of applications.
  • the cam mechanism expediently contains a cam disk and a roller, which are, so to speak, placed on top of one another and thus determine the length of the spreading section.
  • the cam disc can externally take the form of a section of a spiral, but can also have a spiral track or guide groove in which the driven levers engage (advantageously with a roller at the end).
  • the gradient of the spiral can be small in the area close to the fulcrum and larger in the area farther away from the fulcrum. Other gradient distributions can also be made if this is desired for the movement of the lift.
  • the cam mechanism can also have a spatial cam carrier in the form of a section of a combined screw spiral, or the driven lever can itself be designed as a cam carrier and is driven by a second drive, which, however, can also be derived from the first drive.
  • the drive comprises an electric motor and a reduction gear.
  • the reduction gear is expediently self-locking and the motor is provided with a built-in brake.
  • a worm gear can be used as a self-locking reduction gear, the housing of which is secured against rotation on a scissor lift, the drive shaft is parallel and the output shaft is perpendicular to the scissor lever. This enables space-saving accommodation of the motor and the reduction gear in the space between the two pairs of scissor levers.
  • the worm gear can be arranged with a center distance to the cam mechanism and this distance is bridged by a chain gear.
  • the electric drive motor is housed in the space parallel to the chain transmission and the housing of the worm gear is flanged.
  • FIG. 1 A base frame 1 and a platform 2 are arranged one above the other and connected to one another via a lifting scissor device 3.
  • the position of the lifting scissor device can be changed by means of a drive 4.
  • This contains a cam mechanism with two cams 5 and a shaft 6 which is mounted in the lifting scissor device 3.
  • Each cam 5 is supported on its circumference on a roller 7, which are mounted in the base frame 1, but could also be mounted on the platform.
  • the distance of the shaft 6 from the roller 7 is different, and thus the spreading action of the lifting scissor device 3.
  • the cam disc 5 forms part of an Archimedean spiral.
  • a uniform slope of these spirals is chosen.
  • the slope may be lower at the beginning than in the later course of this spiral.
  • the lifting scissor device 3 contains two pairs of scissor lifting legs 11, 12 and 13, 14, which are each pivotably connected to one another via stub axles 15 and 16, respectively.
  • the scissor levers 11 and 13 are connected to the base frame 1 via pivot bearings 17 and the pivot levers 12 and 14 via pivot bearings 18 connected to platform 2.
  • the free ends of the pivot levers 11 and 13 are supported in guides 19 on the platform 2 and those of the scissor levers 12 and 14 in guides 20 on the base frame 1.
  • Corresponding levers of the pairs of scissors are also connected to one another via coupling members 21 to 24, which are designed as tubes.
  • pins with roller bearings 25 are provided for support on the guides 19 and in the extension of the tube 24, pins with roller bearings 26 are provided for support on the guides 20.
  • the ends of the shaft 6 are supported in bearing blocks 27, 28 which are fastened to the pivot levers 11 and 13, respectively, so that the shaft 6 is carried along with the pivoting movement of these scissor levers 11, 13.
  • Arms 29 are also attached to the tube 23 and serve to receive bearings for an output shaft 30 of the drive 4.
  • Chain sprockets 31 are mounted on the shaft 30, which extends parallel to the tube 23, in order to drive corresponding chain sprockets 32, which are fixedly attached to the shaft 6, via a chain 33.
  • the tube 23 is arranged to be adjustable relative to the scissor levers 11 and 13, i.e. at the ends of the tube 23 plates 34 are welded, which have slots 35 as guides, and can be screwed into the appropriate position by means of screws 36 on the respective pivot lever 11 or 13.
  • the position of the plates 34 can be set correctly beforehand by means of set screws 37.
  • the shaft 30 is the output shaft of a worm gear 40, which as such is self-locking, ie cannot be driven in reverse via the shaft 30.
  • a controllable electric motor 41 drives the worm gear via a drive shaft, not shown, which extends perpendicular to the output shaft 30.
  • the electric motor 41 is flanged to the housing of the worm gear 40 to a certain extent floating freely.
  • the housing of the worm gear 40 is connected to the tube 23 via a rod 42.
  • the rod 42 can be designed as a rubber metal element.
  • An electric motor 41 preferably with a built-in brake, is used in order to provide an immediate one after the power supply has been interrupted To bring the lift to a standstill.
  • an incremental angle or displacement measuring device can also be accommodated, which enables the position of the lifting platform to be measured and indicated at any moment and is useful in a control loop for recording the actual value.
  • the bearings 18 of the scissors levers 12 and 14 can be made height-adjustable, as indicated at 45 in FIG. 4.
  • supports 46 can be provided which strike the angle frame 47 of the base frame 1 at the minimum height of the lifting platform.
  • Cantilever arms 48 are welded to the angle iron 47 in the vicinity of the four corners of the lifting platform, of which two cantilever arms 48 are shown in FIG. 3 in order to be able to mount the lifting platform at a suitable location.
  • the platform 2 also has cantilever arms 49 at the four corners in order to be able to attach a further construction, as required in the individual case.
  • FIG. 5 and 6 show a first modification of the lifting platform in a schematic representation with the most essential parts.
  • FIG. 5 shows the lifting scissor device 3 seen from the side and FIG. 6 seen from above.
  • two pairs of scissor levers 11 and 12 or 13 and 14 are provided which are pivotally connected to one another via axle ends 15 and 16.
  • the ends of the scissor levers are connected to the base frame 1 or the platform 2, not shown, in the same way as has been described in the embodiment according to FIGS. 1 to 4.
  • the scissor levers can also be connected to one another via coupling links.
  • the position of the lifting scissor device 3 can be changed by means of a drive 4, which is shown symbolically here as a dash-dotted line and serves to drive a shaft 6, which is mounted in bearing blocks 27 and 28 on the base frame 1 and carries a cam plate 5 at each end. Each cam is supported on its periphery on an associated roller 7, which is mounted on the inner scissor lever 11 and 13 respectively.
  • the outer contour of the disc 5 forms part of an Archimedean spiral, but it is also possible to use a spiral-shaped disc To design leadership for an interventional body according to Part 7. This design with a guide groove opens up the possibility of distributing the stroke movement over one or more revolutions of the cam plate 5.
  • the shaft 6 is mounted in the base frame 1, it is advantageous to also fasten the drive 4 to the base frame.
  • the drive 4 can be configured similarly to that described in the embodiment according to FIGS. 1 to 4, but other configurations are of course also possible in order to be able to drive the shaft 6 at an angle. In any case, the space between the pairs of scissors levers offers space for accommodating a corresponding drive 4.
  • the embodiment of the lifting table according to FIGS. 7 and 8 corresponds to that according to FIGS. 5 and 6, only the shaft 6 is mounted on the platform 2 and accordingly the drive 4 will also be attached to the platform 2.
  • the same reference numerals are used for corresponding parts.
  • the spreading of the lifting scissor device 3 is, however, generated by a spreading force acting between the lifting scissors 11 and 12 or 13 and 14, which acts on the cam plate 5 on the one hand and on the roller 7 on the other hand.
  • the shaft 6 is mounted on the scissor levers 11 and 13, similar to what has been described with reference to FIGS. 1 to 4, but the rollers 7 are fastened to the coupling member 22, which connects the scissor levers 12 and 14 to one another.
  • cam disk it is not necessary for the cam disk to be supported on its circumference, but rather a disk with a spiral guide groove or the like can also be used for the purposes of the invention.
  • the engagement element in this guide groove is expediently designed as a roller, but devices with sliding engagement can also be used.
  • the lift operates as follows: By starting the drive 4, the shaft 6 and thus the cam disc 5 are driven accordingly.
  • the corresponding member 7 slides or rolls along the circumference of the cam disc or along the spiral groove, and the center distance between the parts 6 and 7 increases or decreases, depending on the direction of rotation of the shaft. In the different embodiments, this leads either indirectly or directly to the spreading of the scissor levers or to the decrease in the spread, and the distance between the base plate and the platform changes accordingly.
  • the location of the bearing blocks 27 and 28 along the scissor levers 11 and 13 or along the base frame 1 or platform 2 can be selected to a certain extent and determines the extension height of the lifting platform. Namely, if the center distance of the shaft 6 is moved close to the axis formed by the axis ends 15 and 16, a greater spread of the pivoting lever is achieved than with a larger axis distance from each other. It is therefore in your hands to adapt to changing requirements in practice with regard to the desired extension length.
  • a spatial cam carrier can also be used, which, for example, combines the three-dimensional shapes of the screw and the spiral.
  • a second cam support as the second support means (instead of the roller 7), which are driven to roll on one another and can thus result in different spreading distances.
  • the new lift is simple and robust in its construction and allows to adapt to different requirements.
  • the items used are commercially available and relatively inexpensive.
  • the lifting platform is therefore also intended for applications in which lifting platforms have not previously been used for economic reasons.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)

Claims (11)

  1. Plate-forme de levage destinée à lever, descendre et régler la hauteur des charges, comprenant les éléments suivants :
       un châssis de base (1) ;
       une plate-forme (2) ;
       un dispositif de levage extensible (3) comprenant des paires de leviers croisés (11, 12 ; 13, 14) pour relier le châssis de base (1) à la plate-forme (2), une seule paire de leviers croisés (11, 12 ou 13, 14) étant nécessaire de chaque côté de la plate-forme de levage ;
       un système de commande (4) pour modifier la position des paires de leviers croisés (11, 12 ; 13, 14) du dispositif de levage extensible (3), lequel contient un moteur et une commande à cames (5, 6, 7), qui comprend au moins un disque à cames (5) formant un premier élément de support et un deuxième élément de support (7), entre lesquels se développe une force d'écartement permettant de modifier la position des paires de leviers croisés ;
       caractérisée par les caractéristiques suivantes :
       le disque à cames (5) est commandé pour effectuer un mouvement de rotation pure par l'intermédiaire d'un arbre (6), qui est monté soit contre le châssis de base (1), soit contre la plate-forme (2) ; le moteur est un moteur rotatif (41), qui entraîne l'arbre (6) par l'intermédiaire d'un démultiplicateur.
  2. Plate-forme de levage selon la revendication 1, caractérisée en ce que le deuxième élément de support est une poulie (7) dont l'axe de rotation est associé à l'axe de rotation du disque à cames (5), pratiquement dans un plan vertical, et en ce que la poulie (7) et le disque à cames (5) sont placés l'un sur l'autre pour définir un trajet d'écartement déterminé, la longueur du trajet d'écartement dépendant de la position de rotation de la commande à cames.
  3. Plate-forme de levage selon la revendication 1 ou 2, caractérisée en ce que le dispositif de levage extensible (3) contient deux paires de leviers croisés (11, 12 ; 13, 14), les leviers croisés de chaque paire étant en relation réciproque par l'intermédiaire des axes (15, 16) et les paires à proximité des extrémités des leviers croisés étant reliées l'une à l'autre par l'intermédiaire d'organes de couplage (21 à 24), et en ce que le système de commande (4) est monté dans un espace délimité par le châssis de base (1), la plate-forme (2), les paires de leviers croisés (11, 12 ; 13, 14) et les organes de couplage (21 à 24).
  4. Plate-forme de levage selon la revendication 3, caractérisée en ce que le système de commande (4) est fixé sur l'un (23) des organes de couplage.
  5. Plate-forme de levage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le système de commande (4) est fixé contre le châssis de base (1) ou contre la plate-forme (2).
  6. Plate-forme de levage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le démultiplicateur du système de commande (4) est conçu comme un démultiplicateur à blocage automatique.
  7. Plate-forme de levage selon la revendication 6, caractérisée en ce que le démultiplicateur à blocage automatique est un engrenage à vis sans fin (40), dont l'arbre moteur est parallèle aux leviers croisés et dont l'arbre de sortie (30) est perpendiculaire aux leviers croisés.
  8. Plate-forme de levage selon la revendication 7, caractérisée en ce que l'engrenage à vis sans fin (40) est monté par rapport à la commande à cames (5, 6, 7) avec une distance entre les axes, en ce que cette distance entre les axes est couverte par une transmission à chaîne (31, 32, 33) et en ce qu'un moteur de commande électrique (41) est monté, en tant que moteur rotatif, dans l'espace parallèle à la transmission à chaîne et fixé par bride contre le carter de l'engrenage à vis sans fin (40).
  9. Plate-forme de levage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le système de commande (4) est un moteur électrique réglable (41), dans lequel est intégré un frein.
  10. Plate-forme de levage selon l'une quelconque des revendications 2 à 9, caractérisée en ce que le disque à cames (5) est muni d'une surface de support sous forme d'une partie d'une spirale.
  11. Plate-forme de levage selon la revendication 1, caractérisée en ce que la commande à cames est munie de deux éléments de support, qui peuvent être entraînés, sous forme de disques à cames.
EP19910122043 1991-08-15 1991-12-21 Plateforme de levage Revoked EP0528072B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19910122043 EP0528072B1 (fr) 1991-08-15 1991-12-21 Plateforme de levage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP91113772 1991-08-15
EP91113772A EP0528063A1 (fr) 1991-08-15 1991-08-15 Plateforme de levage
EP19910122043 EP0528072B1 (fr) 1991-08-15 1991-12-21 Plateforme de levage

Publications (2)

Publication Number Publication Date
EP0528072A1 EP0528072A1 (fr) 1993-02-24
EP0528072B1 true EP0528072B1 (fr) 1996-09-25

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ID=26128970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910122043 Revoked EP0528072B1 (fr) 1991-08-15 1991-12-21 Plateforme de levage

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EP (1) EP0528072B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025548A1 (de) * 2006-06-01 2007-12-13 Eisenmann Anlagenbau Gmbh & Co. Kg Hubtisch insbesondere für kleine Hubhöhen
CN108751011A (zh) * 2018-05-25 2018-11-06 石宝春 一种建筑用物料提升装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20209407U1 (de) * 2002-06-17 2003-07-31 REMECH Systemtechnik GmbH & Co. KG, 07334 Kamsdorf Hubvorrichtung, bevorzugt für Skid-Förderanlagen
DE20316905U1 (de) * 2003-11-04 2005-03-17 Expert Maschb Gmbh Scheren-Hubtisch
WO2016066182A1 (fr) * 2014-10-27 2016-05-06 Ssi Schaefer Ag Mécanisme de levage, véhicule navette, et dispositif de levage avec un mécanisme de levage et un système de stockage
EP3418220B1 (fr) * 2017-06-21 2021-07-21 Swisslog-Accalon AB Chariot de transport d'un système de stockage et de récupération et dispositif de levage pour un tel chariot de transport
CN111453645A (zh) * 2019-01-18 2020-07-28 北京京东尚科信息技术有限公司 举升装置及具有该装置的agv小车

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE288100C (fr) *
FR751423A (fr) * 1933-09-02
FR691037A (fr) * 1930-03-04 1930-09-29 A Marrel Sarl Ets Dispositif pour soulever un véhicule du sol
DE1082023B (de) * 1958-12-06 1960-05-19 Ingo Trepel Hebetisch mit Nuernberger Schere
FR1343743A (fr) * 1962-10-12 1963-11-22 Louis & Fils Ets Table élévatrice
FR2281310A1 (fr) * 1974-08-05 1976-03-05 Thaon Maurice Commande d'appareil elevateur
US3950050A (en) * 1974-12-02 1976-04-13 Kinder John W Gear driven linkage for moving members between limit positions
US4114854A (en) * 1977-06-10 1978-09-19 Pac-Craft Products, Inc. Scissors lift work platform

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025548A1 (de) * 2006-06-01 2007-12-13 Eisenmann Anlagenbau Gmbh & Co. Kg Hubtisch insbesondere für kleine Hubhöhen
DE102006025548B4 (de) * 2006-06-01 2009-01-29 Eisenmann Anlagenbau Gmbh & Co. Kg Hubtisch insbesondere für kleine Hubhöhen
CN108751011A (zh) * 2018-05-25 2018-11-06 石宝春 一种建筑用物料提升装置

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Publication number Publication date
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