EP1981801B1 - Lift table with hinged legs - Google Patents

Lift table with hinged legs Download PDF

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Publication number
EP1981801B1
EP1981801B1 EP07730923A EP07730923A EP1981801B1 EP 1981801 B1 EP1981801 B1 EP 1981801B1 EP 07730923 A EP07730923 A EP 07730923A EP 07730923 A EP07730923 A EP 07730923A EP 1981801 B1 EP1981801 B1 EP 1981801B1
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sub
arms
hinged
table according
pairs
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German (de)
French (fr)
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EP1981801A1 (en
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Mathieu Tep
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—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 present invention relates to a lifting table with articulated legs of the type usually referred to as "scissor lift table".
  • a lifting table is for example described in the document DE 200 16 624 U1 .
  • One of the two arms of each of the pairs is articulated by one of its ends on a support structure while its other end is guided by a slide secured to the trays of the table.
  • the other arm is articulated at one of its ends on the table top while its other end is guided by a slideway secured to the support structure.
  • the two arms of each pair comprise two pairs of cam surfaces each defining a variable angle angular abutment.
  • the actuation of the table is then provided by means of two thrust axes movable under the action of motor means which act on the two angular stops of each pair of arms to cause (by a wedge effect) a variation of said angle and therefore, the height of the table.
  • the motor means comprise a geared motor integral with one of the two axes and which generates, by means of belts, traction on the second shaft in the direction of the first.
  • the thrust axes exert on the angular stops a symmetrical action tending to cause a rotation of one arm relative to the other in one direction or the other thereby causing an elevation or a lowering from the table top.
  • the object of the invention is therefore more particularly to eliminate these disadvantages.
  • the base comprises two pairs of arms articulated in their central region around two respective axes of articulation coaxial, one of the two arms of each of pairs being articulated by one of its ends on a support structure and being guided by its other end by an upper slide secured to the table top, the other arm being hinged at one of its ends on the plate of the table and guided at its other end by a lower slide or the like integral with the support structure.
  • this device is characterized in that one of the arms of each of said pairs comprises two cam profiles substantially symmetrical with respect to the axis of articulation of said pair while on the other arm of the same pair are articulated two connecting rods about two respective axes symmetrical with respect to said axis of articulation, these two connecting rods carrying two respective rollers for to cooperate respectively with the two cam profiles, the rods homologous to the two pairs of arms being furthermore interconnected by two parallel transverse shafts bearing at least two respective return pulleys around which, following a sinuous path (in Z ), at least one strap whose one end is fixed to the ends of two homologous arms sliding in upper slides of the table top and whose other end is coupled to a motorization adapted to exert on the strap a force of traction.
  • a rupture sensor may be provided so as to prevent the occurrence of a rupture of the strap or straps and to take all the necessary safety measures.
  • the shape of the cams may be designed to obtain a constant lifting speed.
  • the arms B 2 and B ' 2 are substantially rectilinear and have a substantially rectangular section. They each comprise two cams C 1 , C 2 - C ' 1 , C' 2 whose profiles are arranged symmetrically with respect to the axes of articulation A 1 , A 2 on either side of the arm B 2 , B ' 2 in the vertical plane of movement of the arms B 1 , B 2 and B ' 1 , B' 2 .
  • the arms B 1 and B ' 1 have a substantially Z-shaped shape and have two parallel sections T 1 , T 2 - T' 1 , T ' 2 interconnected at one of their ends by means of a portion central I 1 , I ' 1 curved profile.
  • the sections T 1 , T 2 of the arm B 1 each carry, in the vicinity of the central region I 1 , a link BL 1 , BL 2 articulated by one of its ends on the section T 1 , T 2 around a horizontal axis parallel to the axes A 1 , A 2 .
  • This link BL 1 , BL 2 has at its other end a coaxial bore in which engages a transverse shaft AT 1 , AT 2 .
  • This common shaft AT 1 , AT 2 is provided at one of its ends with a respective roller GA 1 , GA 2 intended to bear respectively on the cam profiles C 1 , C 2 .
  • the arm sections T ' 1 , T' 2 each carry, in the vicinity of their central regions I ' 1 , a rod BL' 1 , BL ' 2 articulated by one of its ends on the section T' 1 , T ' 2 about a horizontal axis coaxial with the axis of articulation of the homologous link BL 1 , BL 2 .
  • This link BL ' 1 , BL' 2 has at its other end a coaxial bore in which engages the transverse shaft AT 1 , AT 2 which is common to the two pairs of rods homologous.
  • this common shaft AT 1 , AT 2 is provided at its end opposite the roller GA 1 , GA 2 , a second roller GA ' 1 , GA' 2 intended to bear on a corresponding cam profile C 1 , C 2 .
  • the transverse shafts AT 1 , AT 2 are provided in their central region with a coaxial tubular sleeve, free in rotation constituting a pulley P 1 , P 2 .
  • the operation of the table is provided by means of straps (here two straps S 1 , S 2 ) which pass over the pulleys P 1 , P 2 following a sinuous path to be fixed by the one of their end on a spreader PA secured to a cross member TR connecting the ends of the arms B 1 , B ' 1 which slide in the upper rails and wind through their other end on a drum TA rotatably mounted on the support structure 1 around a transverse axis coupled to the output of a geared motor M.
  • straps here two straps S 1 , S 2
  • the straps S 1 , S 2 pass around a pulley P 3 rotatably mounted on the support structure 1 about a transverse axis and then follow a first straight path before passing around the pulley P 2 on which they pass, on the opposite side to the pulley P 1 .
  • the straps then make a rectilinear path before passing around the pulley P 1 on the opposite side to the pulley P 2 .
  • the tensile force exerted on the straps S 1 , S 2 by the drum TA driven by the motor M is reflected on the pulleys P 1 , P 2 on which two parallel forces are exerted which generate on the arms two pairs of rotation in opposite directions of each other whose moments depend on the position of the rollers GA 1 , GA 2 - GA ' 1 , GA' 2 on the cam surfaces C 1 , C 2 - C ' 1 , C' 2 .
  • the fixed support structure consists of a rectangular metal frame whose two longitudinal uprights are formed by U-section sections whose anterior parts constitute the slides - G 1 and G 2 in which are engaged rollers carried by the ends of the arms B 2 , B ' 2 .
  • the support rails of the plate are constituted by U-section sections in which rollers carried by the ends of the arms B 1 , B ' 1 engage.
  • the lateral stability of the table is provided here by connecting plates connecting the homologous sections T 1 , T ' 1 - T 2 , T' 2 of the arms B 1 , B ' 1 .
  • the strap rupture sensor associated with the lifter PA, can be coupled to a safety device capable of locking during the downward movement of the table to prevent the lift table from falling abruptly as a result of a strap rupture.
  • This sensor may also be used to detect the presence of an obstacle opposing the descent of the table top.
  • This solution also has the advantage of dispensing with the use of a low overtravel detector usually used to protect the mechanism.
  • the number and the nature of the straps can be determined according to the weight of the loads that the lift table is made to support.
  • the rods BL 1 , BL 2 - BL ' 1 , BL' 2 have an H-shaped structure, comprising two parallel wings connected by a cross member. This structure defines on one side a clevis joint in which engages a corresponding section of arms B 1 , B ' 1 .
  • the other end forms a double bearing in which engages the axis of the pulleys P 1 , P 2 .

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Baking, Grill, Roasting (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Passenger Equipment (AREA)

Abstract

The lift table according to the invention comprises a platform supported by two pairs of arms (B<SUB>1</SUB>, B<SUB>2</SUB>) hinged in their central region about two coaxial axes (A<SUB>1</SUB>, A<SUB>2</SUB>), one of the arms (B<SUB>1</SUB>) of each of the pairs being hinged at one of its ends to a supporting structure (2) and being guided at its other end by a track integral with the platform, the other arm (B<SUB>2</SUB>) being hinged at one of its ends to the platform and guided at the other end on a track integral with the structure (2). One of the arms (B<SUB>2</SUB>) of each of the pairs comprises two cam profiles (C<SUB>1</SUB>, C<SUB>2</SUB>) on which there press two respective rollers mounted on links (BL<SUB>1</SUB>, BL<SUB>2</SUB>) hinged to the other arm (B<SUB>1</SUB>) and urged by straps (S<SUB>1, </SUB>S<SUB>2</SUB>) along a winding path and on which a pulling force is exerted.

Description

La présente invention concerne une table élévatrice à piètements articulés du type habituellement désigné "table élévatrice à ciseaux". Une telle table élévatrice est par exemple décrite dans le document DE 200 16 624 U1 .The present invention relates to a lifting table with articulated legs of the type usually referred to as "scissor lift table". Such a lifting table is for example described in the document DE 200 16 624 U1 .

D'une manière générale, on sait que dans l'industrie, l'intégration de tables élévatrice est fréquente dans le domaine de la manutention, dans des lignes de montage, etc.In general, we know that in industry, the integration of lift tables is common in the field of handling, in assembly lines, etc.

La technologie utilisée pour la réalisation de ces tables dépend de paramètres tels que :

  • la course de levage,
  • l'encombrement en épaisseur,
  • la capacité de charge,
  • l'énergie utilisée,
  • le coût.
The technology used to produce these tables depends on parameters such as:
  • lifting stroke,
  • the bulkiness in thickness,
  • the carrying capacity,
  • the energy used,
  • the cost.

Dans le marché actuel, il est proposé différentes technologies de tables à ciseaux, à savoir notamment :

  • Des tables hydrauliques à ciseaux capables de soulever des charges importantes. Toutefois, ces tables sont lourdes et présentent des vitesses de translation du plateau très lentes. Par ailleurs, elles sont en général bruyantes en raison de la présence d'une unité de pompage hydraulique.
  • Des tables pneumatiques à ciseaux qui sont habituellement limitées en capacité de charge.
  • Des tables électriques à ciseaux dont le coût est généralement élevé.
In the current market, it is proposed different technologies of scissor tables, namely including:
  • Hydraulic scissor tables capable of lifting heavy loads. However, these tables are heavy and have slow speeds. translation of the plateau very slow. In addition, they are usually noisy due to the presence of a hydraulic pumping unit.
  • Pneumatic scissor tables that are usually limited in load capacity.
  • Electric scissor tables whose cost is generally high.

Ainsi, par le brevet FR No 02 03058 , on connaît notamment une table élévatrice dont le piètement est composé de deux paires de bras articulés, dans leur région centrale autour de deux axes d'articulation centraux coaxiaux respectifs de manière à ce que les bras de chacune de ces paires puissent pivoter dans un plan vertical.Thus, by the patent FR No 02 03058 it is known in particular a lifting table whose base is composed of two pairs of articulated arms, in their central region around two respective coaxial central articulation axes so that the arms of each of these pairs can pivot in a plane vertical.

L'un des deux bras de chacune des paires est articulé par l'une de ses extrémités sur une structure support tandis que son autre extrémité est guidée par une glissière solidaire des plateaux de la table.One of the two arms of each of the pairs is articulated by one of its ends on a support structure while its other end is guided by a slide secured to the trays of the table.

L'autre bras est articulé à l'une de ses extrémités sur le plateau de la table tandis que son autre extrémité est guidée par une glissière solidaire de la structure support.The other arm is articulated at one of its ends on the table top while its other end is guided by a slideway secured to the support structure.

Au voisinage de leur axe d'articulation central, les deux bras de chaque paire comprennent deux couples de surfaces de came définissant chacun une butée angulaire à angle variable.In the vicinity of their central hinge axis, the two arms of each pair comprise two pairs of cam surfaces each defining a variable angle angular abutment.

L'actionnement de la table est alors assuré au moyen de deux axes de poussée mobiles sous l'action de moyens moteurs qui agissent sur les deux butées angulaires de chacune des paires de bras pour provoquer (par effet de coin) une variation dudit angle et, par conséquent, de la hauteur de la table.The actuation of the table is then provided by means of two thrust axes movable under the action of motor means which act on the two angular stops of each pair of arms to cause (by a wedge effect) a variation of said angle and therefore, the height of the table.

Les moyens moteurs comprennent un motoréducteur solidaire de l'un des deux axes et qui engendre, par le biais de courroies, une traction sur le second arbre en direction du premier.The motor means comprise a geared motor integral with one of the two axes and which generates, by means of belts, traction on the second shaft in the direction of the first.

Grâce à cette disposition, les axes de poussée exercent sur les butées angulaires une action symétrique tendant à provoquer une rotation de l'un des bras par rapport à l'autre dans un sens ou dans l'autre en provoquant ainsi une élévation ou un abaissement du plateau de la table.With this arrangement, the thrust axes exert on the angular stops a symmetrical action tending to cause a rotation of one arm relative to the other in one direction or the other thereby causing an elevation or a lowering from the table top.

L'inconvénient de cette solution réside donc dans le fait que les moyens moteurs se trouvent "suspendus" aux axes de poussées et doivent être équipés d'un support anti-pivot. La disposition de cet ensemble mobile et volumineux entre la structure support et le plateau, ainsi que le poids qu'elle exerce sur la structure articulée de la table, ne sont pas acceptables dans de nombreuses application.The disadvantage of this solution lies in the fact that the motor means are "suspended" to the thrust axes and must be equipped with an anti-pivot support. The arrangement of this mobile and bulky assembly between the support structure and the plate, as well as the weight it exerts on the articulated structure of the table, are not acceptable in many applications.

L'invention a donc plus particulièrement pour but de supprimer ces inconvénients.The object of the invention is therefore more particularly to eliminate these disadvantages.

Elle propose donc à cet effet une table élévatrice présentant une structure générale similaire à celle précédemment décrite dont le piètement comprend deux paires de bras articulés dans leur région centrale autour de deux axes d'articulation respectifs coaxiaux, l'un des deux bras de chacune des paires étant articulé par l'une de ses extrémités sur une structure support et étant guidé par son autre extrémité par une glissière supérieure solidaire du plateau de la table, l'autre bras étant articulé à l'une de ses extrémités sur le plateau de la table et guidé à son autre extrémité par une glissière inférieure ou analogue solidaire de la structure support.It therefore proposes for this purpose a lifting table having a general structure similar to that described above, the base comprises two pairs of arms articulated in their central region around two respective axes of articulation coaxial, one of the two arms of each of pairs being articulated by one of its ends on a support structure and being guided by its other end by an upper slide secured to the table top, the other arm being hinged at one of its ends on the plate of the table and guided at its other end by a lower slide or the like integral with the support structure.

Selon l'invention, ce dispositif est caractérisé en ce que l'un des bras de chacune desdites paires comprend deux profils de came sensiblement symétriques par rapport à l'axe d'articulation de ladite paire tandis que sur l'autre bras de cette même paire sont articulées deux bielles autour de deux axes respectifs symétriques par rapport audit axe d'articulation, ces deux bielles portant deux galets respectifs destinés à coopérer respectivement avec les deux profils de came, les bielles homologues des deux paires de bras étant par ailleurs reliées entre elles par deux arbres transversaux respectifs parallèles portant au moins deux poulies de renvoi respectives autour desquelles passe, en suivant un trajet sinueux (en Z), au moins une sangle dont l'une des extrémités est fixée aux extrémités de deux bras homologues coulissant dans des glissières supérieures du plateau de la table et dont l'autre extrémité est couplée à une motorisation apte à exercer sur la sangle un effort de traction.According to the invention, this device is characterized in that one of the arms of each of said pairs comprises two cam profiles substantially symmetrical with respect to the axis of articulation of said pair while on the other arm of the same pair are articulated two connecting rods about two respective axes symmetrical with respect to said axis of articulation, these two connecting rods carrying two respective rollers for to cooperate respectively with the two cam profiles, the rods homologous to the two pairs of arms being furthermore interconnected by two parallel transverse shafts bearing at least two respective return pulleys around which, following a sinuous path (in Z ), at least one strap whose one end is fixed to the ends of two homologous arms sliding in upper slides of the table top and whose other end is coupled to a motorization adapted to exert on the strap a force of traction.

Ainsi, lorsque la motorisation engendre sur la sangle un effort de traction, les galets de renvoi exercent, sur les profils de came de chaque bras correspondant, deux efforts parallèles en sens inverse l'un de l'autre qui engendrent un couple provoquant la rotation relative des bras de chacune des paires et, en conséquence, un déplacement en translation verticale du plateau de la table.Thus, when the drive generates on the strap a tensile force, the return rollers exert, on the cam profiles of each corresponding arm, two parallel forces in opposite directions to each other which generate a torque causing the rotation relative arms of each of the pairs and, consequently, a displacement in vertical translation of the table top.

Avantageusement, pour obtenir une meilleure répartition des efforts, on pourra utiliser plusieurs sangles fixées à l'une de leurs extrémités à un palonnier articulé sur une traverse reliant les extrémités des bras qui coulissent dans les glissières supérieures. Un capteur de rupture pourra être prévu de manière à prévenir l'occurrence d'une rupture de la ou desdites sangles et pour prendre toutes les mesures de sécurité nécessaires.Advantageously, to obtain a better distribution of forces, it will be possible to use several straps attached at one of their ends to a spreader hinged on a cross member connecting the ends of the arms which slide in the upper rails. A rupture sensor may be provided so as to prevent the occurrence of a rupture of the strap or straps and to take all the necessary safety measures.

Par ailleurs, la forme des cames pourra être conçue pour obtenir une vitesse de levage constante.In addition, the shape of the cams may be designed to obtain a constant lifting speed.

Un mode d'exécution de l'invention sera décrit ci-après, à titre d'exemple non limitatif, avec référence aux dessins annexés dans lesquels :

  • La figure 1 est une vue en perspective d'une table élévatrice selon l'invention ;
  • La figure 2 est une vue partielle en perspective de la table représentée figure 1, cette vue permettant d'illustrer le principe cinématique de la table ;
  • La figure 3 est une vue de côté de la table représentée figures 1 et 2.
One embodiment of the invention will be described below, by way of non-limiting example, with reference to the accompanying drawings in which:
  • The figure 1 is a perspective view of a lift table according to the invention;
  • The figure 2 is a partial perspective view of the table shown figure 1 , this view to illustrate the kinematic principle of the table;
  • The figure 3 is a side view of the table shown figures 1 and 2 .

Dans cet exemple, la table élévatrice comprend un plateau rectangulaire 1 monté sur une structure de support fixe par l'intermédiaire d'un piètement articulé comprenant deux paires de bras B1, B2 - B'1, B'2 mobiles dans deux plans verticaux parallèles respectifs, à savoir :

  • Une première paire comprenant :
    • ○ un bras B'2 monté coulissant, par l'une de ses extrémités, le long d'une glissière inférieure G1 portée par la structure fixe 2 et articulé, par son autre extrémité, sur un longeron de support du plateau 1,
    • ○ un bras B'1 articulé, par l'une de ses extrémités, sur la structure support fixe 2 et dont l'autre extrémité est montée coulissante le long d'une glissière supérieure solidaire dudit longeron.
In this example, the lifting table comprises a rectangular plate 1 mounted on a fixed support structure via an articulated base comprising two pairs of arms B 1 , B 2 - B ' 1 , B' 2 moving in two planes respective vertical vertices, namely:
  • A first pair comprising:
    • An arm B ' 2 slidably mounted, at one of its ends, along a lower slide G 1 carried by the fixed structure 2 and articulated, at its other end, to a support spar of the plate 1,
    • An arm B ' 1 articulated, at one of its ends, to the fixed support structure 2 and whose other end is slidably mounted along an upper slideway secured to said spar.

Les bras B'1 et B'2 sont articulés au niveau de leur région centrale autour d'un axe horizontal A1 de manière à obtenir une première structure en forme de X.

  • Une deuxième paire (visible figures 2 et 3) comprenant :
    • ○ un bras B2 monté coulissant, par l'une de ses extrémités, le long d'une glissière inférieure G2 portée par la structure fixe 2, et articulé par son autre extrémité sur un longeron L de support du plateau 1,
    • o un bras B1 articulé, par l'une de ses extrémités, sur la structure support fixe 2 et dont l'autre extrémité est montée coulissante le long d'une glissière supérieure G3 solidaire dudit longeron L.
    Les bras B1 et B2 sont articulés au niveau de leur région centrale autour d'un axe horizontal A2 coaxial à l'axe A1 de manière à obtenir une seconde structure en forme de X qui s'étend parallèlement à la première structure et symétriquement à celle-ci par rapport à un plan médian vertical de symétrie de la table.
The arms B ' 1 and B' 2 are articulated at their central region around a horizontal axis A 1 so as to obtain a first X-shaped structure.
  • A second pair (visible figures 2 and 3 ) including:
    • An arm B 2 slidably mounted, at one of its ends, along a lower slide G 2 carried by the fixed structure 2, and articulated by its other end to a support beam L of the plate 1,
    • o an articulated arm B 1, by one of its ends, on the fixed support structure 2 and the other end is slidably mounted along an upper track G 3 integral with said beam L.
    The arms B 1 and B 2 are articulated at their central region around a horizontal axis A 2 coaxial with the axis A 1 so as to obtain a second X-shaped structure which extends parallel to the first structure and symmetrically to it with respect to a vertical median plane of symmetry of the table.

Dans cet exemple, les bras B2 et B'2 sont sensiblement rectilignes et présentent une section sensiblement rectangulaire. Ils comprennent chacun deux cames C1, C2 - C'1, C'2 dont les profils sont disposés symétriquement par rapport aux axes d'articulation A1, A2 de part et d'autre du bras B2, B'2 dans le plan vertical de débattement des bras B1, B2 et B'1, B'2.In this example, the arms B 2 and B ' 2 are substantially rectilinear and have a substantially rectangular section. They each comprise two cams C 1 , C 2 - C ' 1 , C' 2 whose profiles are arranged symmetrically with respect to the axes of articulation A 1 , A 2 on either side of the arm B 2 , B ' 2 in the vertical plane of movement of the arms B 1 , B 2 and B ' 1 , B' 2 .

Les bras B1 et B'1 présentent une forme sensiblement en Z et présentent deux tronçons parallèles T1, T2 - T'1, T'2 reliés entre eux à l'une de leurs extrémités par l'intermédiaire d'une portion centrale I1, I'1 de profil incurvé.The arms B 1 and B ' 1 have a substantially Z-shaped shape and have two parallel sections T 1 , T 2 - T' 1 , T ' 2 interconnected at one of their ends by means of a portion central I 1 , I ' 1 curved profile.

Les tronçons T1, T2 du bras B1 portent chacun, au voisinage de la région centrale I1, une biellette BL1, BL2 articulée par l'une de ses extrémités sur le tronçon T1, T2 autour d'un axe horizontal parallèle aux axes A1, A2. Cette biellette BL1, BL2 présente à son autre extrémité un perçage coaxial dans lequel s'engage un arbre transversal AT1, AT2. Cet arbre commun AT1, AT2 est muni à l'une de ses extrémités d'un galet respectif GA1, GA2 destiné à venir respectivement en appui sur les profils de came C1, C2.The sections T 1 , T 2 of the arm B 1 each carry, in the vicinity of the central region I 1 , a link BL 1 , BL 2 articulated by one of its ends on the section T 1 , T 2 around a horizontal axis parallel to the axes A 1 , A 2 . This link BL 1 , BL 2 has at its other end a coaxial bore in which engages a transverse shaft AT 1 , AT 2 . This common shaft AT 1 , AT 2 is provided at one of its ends with a respective roller GA 1 , GA 2 intended to bear respectively on the cam profiles C 1 , C 2 .

De même, les tronçons de bras T'1, T'2 portent chacun, au voisinage de leurs régions centrales I'1, une biellette BL'1, BL'2 articulée par l'une de ses extrémités sur le tronçon T'1, T'2 autour d'un axe horizontal coaxial à l'axe d'articulation de la biellette homologue BL1, BL2. Cette biellette BL'1, BL'2 présente à son autre extrémité un perçage coaxial dans lequel s'engage l'arbre transversal AT1, AT2 qui est commun aux deux paires de biellettes homologues. D'une façon analogue à la précédente, cet arbre commun AT1, AT2 est muni à son extrémité opposé au galet GA1, GA2, d'un deuxième galet GA'1, GA'2 destiné à venir en appui sur un profil de came correspondant C1, C2.Similarly, the arm sections T ' 1 , T' 2 each carry, in the vicinity of their central regions I ' 1 , a rod BL' 1 , BL ' 2 articulated by one of its ends on the section T' 1 , T ' 2 about a horizontal axis coaxial with the axis of articulation of the homologous link BL 1 , BL 2 . This link BL ' 1 , BL' 2 has at its other end a coaxial bore in which engages the transverse shaft AT 1 , AT 2 which is common to the two pairs of rods homologous. In a manner analogous to the previous one, this common shaft AT 1 , AT 2 is provided at its end opposite the roller GA 1 , GA 2 , a second roller GA ' 1 , GA' 2 intended to bear on a corresponding cam profile C 1 , C 2 .

Les arbres transversaux AT1, AT2 sont munis dans leur région centrale d'un manchon tubulaire coaxial, libre en rotation constituant une poulie de renvoi P1, P2.The transverse shafts AT 1 , AT 2 are provided in their central region with a coaxial tubular sleeve, free in rotation constituting a pulley P 1 , P 2 .

Comme précédemment mentionné, l'actionnement de la table est assuré au moyen de sangles (ici deux sangles S1, S2) qui passent sur les poulies de renvoi P1, P2 en suivant un trajet sinueux pour venir se fixer par l'une de leur extrémité sur un palonnier PA solidaire d'une traverse TR reliant les extrémités des bras B1, B'1 qui coulissent dans les glissières supérieures et s'enrouler par leur autre extrémité sur un tambour TA monté rotatif sur la structure support 1 autour d'un axe transversal couplé à la sortie d'un motoréducteur M.As previously mentioned, the operation of the table is provided by means of straps (here two straps S 1 , S 2 ) which pass over the pulleys P 1 , P 2 following a sinuous path to be fixed by the one of their end on a spreader PA secured to a cross member TR connecting the ends of the arms B 1 , B ' 1 which slide in the upper rails and wind through their other end on a drum TA rotatably mounted on the support structure 1 around a transverse axis coupled to the output of a geared motor M.

Au sortir du tambour TA, les sangles S1, S2 passent autour d'une poulie de renvoi P3 montée rotative sur la structure support 1 autour d'un axe transversal puis suivent un premier trajet rectiligne avant de passer autour de la poulie P2 sur laquelle elles passent, du côté opposé à la poulie P1.On leaving the drum TA, the straps S 1 , S 2 pass around a pulley P 3 rotatably mounted on the support structure 1 about a transverse axis and then follow a first straight path before passing around the pulley P 2 on which they pass, on the opposite side to the pulley P 1 .

Les sangles effectuent ensuite un trajet rectiligne avant de passer autour de la poulie P1 du côté opposé à la poulie P2.The straps then make a rectilinear path before passing around the pulley P 1 on the opposite side to the pulley P 2 .

Après leur passage sur la poulie P1, elles suivent un nouveau trajet sensiblement parallèle au premier avant de venir se fixer sur la traverse TR par l'intermédiaire du palonnier.After passing over the pulley P 1 , they follow a new path substantially parallel to the first before coming to be fixed on the crossbar TR by means of the spreader.

Grâce à cette disposition, l'effort de traction exercé sur les sangles S1, S2 par le tambour TA entraîné par le moteur M, se répercute sur les poulies P1, P2 sur lesquelles s'exercent deux forces parallèles qui engendrent sur les bras deux couples de rotation en sens inverse l'un de l'autre dont les moments dépendent de la position des galets GA1, GA2 - GA'1, GA'2 sur les surfaces de came C1, C2 - C'1, C'2.Thanks to this arrangement, the tensile force exerted on the straps S 1 , S 2 by the drum TA driven by the motor M, is reflected on the pulleys P 1 , P 2 on which two parallel forces are exerted which generate on the arms two pairs of rotation in opposite directions of each other whose moments depend on the position of the rollers GA 1 , GA 2 - GA ' 1 , GA' 2 on the cam surfaces C 1 , C 2 - C ' 1 , C' 2 .

C'est la raison pour laquelle la forme de ces profils de came C1, C2 - C'1, C'2 est conçue de manière à obtenir une vitesse de levage constante.This is the reason why the shape of these cam profiles C 1 , C 2 - C ' 1 , C' 2 is designed to obtain a constant lifting speed.

Dans l'exemple précédemment décrit, la structure support fixe consiste en un cadre métallique rectangulaire dont les deux montants longitudinaux sont constitués par des profilés de section en U dont les parties antérieures constituent les glissières - G1 et G2 dans lesquelles s'engagent des galets portés par les extrémités des bras B2, B'2.In the example described above, the fixed support structure consists of a rectangular metal frame whose two longitudinal uprights are formed by U-section sections whose anterior parts constitute the slides - G 1 and G 2 in which are engaged rollers carried by the ends of the arms B 2 , B ' 2 .

De même, les longerons de support du plateau sont constitués par des profilés de section en U dans lesquels s'engagent des galets portés par les extrémités des bras B1, B'1.Similarly, the support rails of the plate are constituted by U-section sections in which rollers carried by the ends of the arms B 1 , B ' 1 engage.

La stabilité latérale de la table est assurée ici par des tôles de liaison reliant les tronçons homologues T1, T'1 - T2, T'2 des bras B1, B'1.The lateral stability of the table is provided here by connecting plates connecting the homologous sections T 1 , T ' 1 - T 2 , T' 2 of the arms B 1 , B ' 1 .

Le capteur de rupture de sangle, associé au palonnier PA, peut être couplé à un dispositif de sécurité apte à effectuer un blocage pendant le mouvement de descente de la table pour permettre d'éviter que la table élévatrice ne tombe brutalement à la suite d'une rupture de sangle. Ce capteur pourra être également utilisé pour détecter la présence d'un obstacle s'opposant à la descente du plateau de la table. Cette solution présente en outre l'avantage de se dispenser de l'usage d'un détecteur de surcourse basse habituellement utilisé pour protéger le mécanisme.The strap rupture sensor, associated with the lifter PA, can be coupled to a safety device capable of locking during the downward movement of the table to prevent the lift table from falling abruptly as a result of a strap rupture. This sensor may also be used to detect the presence of an obstacle opposing the descent of the table top. This solution also has the advantage of dispensing with the use of a low overtravel detector usually used to protect the mechanism.

Le nombre ainsi que la nature des sangles pourront être déterminés en fonction du poids des charges que la table élévatrice est amenée à supporter.The number and the nature of the straps can be determined according to the weight of the loads that the lift table is made to support.

Dans cet exemple, les biellettes BL1, BL2 - BL'1, BL'2 présentent une structure en forme de H, comportant deux ailes parallèles reliées par une traverse. Cette structure définit d'un côté une chape d'articulation dans laquelle s'engage un tronçon correspondant des bras B1, B'1.In this example, the rods BL 1 , BL 2 - BL ' 1 , BL' 2 have an H-shaped structure, comprising two parallel wings connected by a cross member. This structure defines on one side a clevis joint in which engages a corresponding section of arms B 1 , B ' 1 .

L'autre extrémité forme un double palier dans lequel s'engage l'axe des poulies P1, P2.The other end forms a double bearing in which engages the axis of the pulleys P 1 , P 2 .

Claims (9)

  1. A lift table including a platform (1) supported by a base comprising two pairs of arms (B1, B2 - B'1, B'2) hinged in their central region around two respective coaxial axes (A1, A2), one of the two arms of each of the pairs being hinged by one of its ends on a support structure (2) and being guided by its other end by an upper track integral with the platform (1) of the table, the other arm being hinged at one of its ends on the platform (1) of the table and guided at its other end by a lower track (G1, G2) or similar integral with the support structure (2), one of the arms (B2, B'2) of each of said pairs comprising two cam profiles (C1, C2 - C'1, C'2) essentially symmetrical relative to the axis of said pair, characterized in that on the other arm (B1, B'1) of this same pair are hinged two links (BL1, BL2, BL'1, BL'2) around two respective axes symmetrical relative to said axis (A1, A2), these two links (BL1, BL2, BL'1, BL'2) supporting two respective rollers designed to cooperate with the two cam profiles (C1, C2 - C'1, C'2), respectively, the links similar to the two pairs of arms also being connected to each other by two respective parallel transverse shafts supporting at least two respective return pulleys (P1, P2) around which pass, following a winding path (in a Z), at least one strap (S1, S2) whereof one of the ends is fastened to the ends of the two similar arms sliding in upper tracks of the platform (1) of the table and the other end of which is coupled to a motorization (M) capable of exerting a tensile strain on the strap (S1, S2).
  2. The table according to claim 1,
    characterized in that it comprises several straps (S1, S2) fastened at one of their ends to a spreader (PA) hinged on a cross-piece (TR) connecting the ends of the arms (B1, B'1), which slide in the aforementioned upper tracks.
  3. The table according to one of claims 1 and 2,
    characterized in that it comprises a break sensor capable of preventing the occurrence of a break of said strap(s) (S1, S2), this sensor being coupled to a security device capable of performing a blockage during the downward movement of the table.
  4. The table according to one of the preceding claims,
    characterized in that the shape of the cams (C1, C2) is designed so as to obtain a constant lifting speed.
  5. The table according to one of the preceding claims,
    characterized in that the fixed support structure (2) consists of a rectangular metal frame whereof the longitudinal posts are made up of profiles whereof the anterior portions constitute the tracks (G1, G2) in which rollers supported by the ends of the aforementioned arms (B2, B'2) engage.
  6. The table according to one of the preceding claims,
    characterized in that the platform (1) of the table is supported by two parallel beams formed by profiles with a U-shaped section in which rollers supported by the ends of the arms (B1, B'1) engage.
  7. The table according to one of the preceding claims,
    characterized in that the lateral stability of the table is ensured by connecting sheets connecting similar sections (T1, T'1, T2, T'2) of the arms (B1, B'1).
  8. The table according to one of the preceding claims,
    characterized in that the aforementioned links (BL1, BL2, BL'1, BL'2) have an H-shaped structure including two parallel wings connected by a cross-piece, this structure defining on one side an articulation stirrup in which a corresponding section of the arms (B1, B'1 - B2, B'2) engages and on the other side a double bearing in which the axle of the pulleys (P1, P2) engages.
  9. The table according to one of the preceding claims,
    characterized in that the aforementioned motorization comprises a gear motor (M) coupled to a drum (TA) around which the end of the straps (S1, S2) winds.
EP07730923A 2006-02-09 2007-02-02 Lift table with hinged legs Active EP1981801B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0601191A FR2897049B1 (en) 2006-02-09 2006-02-09 LIFT TABLE WITH ARTICULATED PIETEMENTS.
PCT/FR2007/000207 WO2007090954A1 (en) 2006-02-09 2007-02-02 Lift table with hinged legs

Publications (2)

Publication Number Publication Date
EP1981801A1 EP1981801A1 (en) 2008-10-22
EP1981801B1 true EP1981801B1 (en) 2010-09-15

Family

ID=36754695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07730923A Active EP1981801B1 (en) 2006-02-09 2007-02-02 Lift table with hinged legs

Country Status (7)

Country Link
EP (1) EP1981801B1 (en)
AT (1) ATE481352T1 (en)
DE (2) DE202006003583U1 (en)
ES (1) ES2354473T3 (en)
FR (1) FR2897049B1 (en)
TR (1) TR200700552U (en)
WO (1) WO2007090954A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2019076A1 (en) * 2007-07-27 2009-01-28 Ludwig Göcke Power-operated scissor table
FR2961799A1 (en) * 2010-06-23 2011-12-30 Normands De Const Ind Atel Sticking table for transferring e.g. chassis of heavy lorry, has belt whose current part cooperates with spacing elements such that belt connects elements closer to deploy elements from shearing mechanism and raise upper framework
CN114988321A (en) * 2022-06-14 2022-09-02 南京林业大学 Scissor rod lifting platform

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20016624U1 (en) * 2000-09-22 2000-11-23 Penzek, Eckhardt, Dipl.-Ing., 66386 St Ingbert Scissor lift table
FR2837193A1 (en) * 2002-03-12 2003-09-19 Transportes Continuos Interior Scissors elevator table comprises arms mounted on pivot pin and pressure spindles displaced by motors acting on arm side to cause raising or descent of table surface
DE102004057055A1 (en) * 2004-11-25 2006-06-01 Ernst Langewellpott Scissor lift table

Also Published As

Publication number Publication date
DE602007009193D1 (en) 2010-10-28
ES2354473T3 (en) 2011-03-15
FR2897049B1 (en) 2008-05-09
FR2897049A1 (en) 2007-08-10
EP1981801A1 (en) 2008-10-22
ATE481352T1 (en) 2010-10-15
TR200700552U (en) 2007-09-21
DE202006003583U1 (en) 2006-07-27
WO2007090954A1 (en) 2007-08-16

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