FR2894919A1

FR2894919A1 - Self-supporting truck for transporting e.g. goods, has articulation unit permitting drawbar to be freely rotated around horizontal axis from angular normal or abnormal usage zone until angular mounting/dismounting zone

Info

Publication number: FR2894919A1
Application number: FR0513080A
Authority: FR
Inventors: Alexandre Delattre
Original assignee: BEKAERT HANDLING SNC
Current assignee: BEKAERT HANDLING SNC
Priority date: 2005-12-21
Filing date: 2005-12-21
Publication date: 2007-06-22
Anticipated expiration: 2025-12-21
Also published as: FR2894919B1

Abstract

The truck (1) has an articulation unit (8) connecting a drawbar (6) to a frame (2) and permitting the drawbar to be freely rotated around a horizontal axis from angular normal or abnormal usage zone until an angular mounting/dismounting zone. The articulation unit has a horizontal pivot, comprising the horizontal axis as a main axis, integrated with ends of the drawbar and forming a T shape with the ends. An independent claim is also included for a method of dismounting a drawbar.

Description

La presente invention concerne un chariot autoporteur destine aThe present invention relates to a self-supporting trolley for

transporter tout type de produit ou marchandise dispose dans des conditionnements specifiques ou bien en vrac et son procede de demontage. transport any type of product or merchandise available in specific packaging or in bulk and its method of disassembly.

Ce type de chariot connu est essentiellement compose d'une structure de base formee par un cadre en profile sur laquelle toutes les autres parties sont rattachees. Elie sert egalement de calage pour les produits a transporter. Sous la structure de base precitee, sont disposees deux roues fixes et deux roues pivotantes permettant ainsi le deplacement du chariot de maniere stable et directionnelle. A I'avant du chariot est dispose un timon articule destine a assurer une liaison entre deux chariots ou entre un chariot et un crochet manuel ou encore un train entre un chariot et un chariot automoteur. Les timons connus pour ce type de chariot sont generalement relies a celui-ci de maniere fixe dont le demontage ne peut titre assure que par un personnel qualifie tors de I'entretien du timon, ou encore pour son remplacement lors d'une deterioration. Donc la presente invention a pour but de remedier a cet inconvenient et concerne a cet effet un chariot autoporteur du type comprenant un chassis constituant une structure de base formee par un profile, chassis sous Iequel sont disposees des roues directionnelles ou non et muni dans une zone centrale d'extremite avant d'un timon articule susceptible de cooperer avec un crochet d'attelage pour titre tracte par tout moyen. Selon ('invention, le chariot autoporteur comprend un moyen d'articulation permettant au timon d'etre libre en rotation autour d'un axe horizontal depuis ('une quelconque des zones angulaires d'utilisation normale ou anormale jusqu'a une zone angulaire de montage/demontage du timon sans outil. Une telle articulation, objet de ('invention, offre I'avantage au timon d'etre demontable sans effort, ni outil, tout en respectant 35 la rigidite et la fonctionnalite requises. This type of known trolley is essentially composed of a basic structure formed by a frame in profile on which all the other parts are attached. Elie also serves as a cushion for the products to be transported. Under the aforementioned basic structure, there are two fixed wheels and two swivel wheels allowing the carriage to move in a stable and directional manner. At the front of the trolley is a articulated drawbar intended to provide a connection between two carriages or between a carriage and a manual hook or a train between a carriage and a self-propelled carriage. Knocks known for this type of carriage are generally connected thereto in a fixed manner whose disassembly can only be assured by qualified personnel tors maintenance of the drawbar, or for its replacement during deterioration. Thus the present invention aims to remedy this drawback and concerns for this purpose a self-supporting trolley of the type comprising a frame constituting a base structure formed by a profile, chassis under which are arranged directional wheels or not and provided in a zone central end of a front articulated drawbar likely to cooperate with a towing hook title retracted by any means. According to the invention, the self-supporting carriage comprises a hinge means allowing the drawbar to be free to rotate about a horizontal axis from any of the angular areas of normal or abnormal use to an angular zone of This type of joint, object of the invention, offers the advantage to the drawbar of being demountable without effort or tool, while respecting the rigidity and the functionality required.

Elle a egalement pour effet de faciliter et donc d'accelerer les operations de maintenance sur les timons. Elle presente egalement I'avantage d'etre limitee a deux pieces de construction, rune et I'autre etant realisees a partir de fils d'acier pouvant titre economiquement produites sur des machines automatiques programmees pour des series, et cela sans emboutissage, poingonnage, tournage, fraisage, toute operation d'usinage en fait. La presente invention concerne egalement toutes les caracteristiques qui vont suivre et qui devront titre considerees isolement ou selon toutes leurs combinaisons techniques possibles : - le timon est relie au chassis par I'intermediaire du moyen d'articulation constituee d'une part par un pivot horizontal solidaire des extremites du timon et formant un T avec celui-ci, ledit pivot horizontal ayant comme axe principale Iaxe horizontal, et d'autre part, par un support fixe solidaire du chassis apte a bloquer en translation le pivot horizontal suivant les axes X, Y et Z, - le support fixe comprend deux bras centraux paralleles entre eux et distants run de I'autre pour permettre la libre rotation du timon autour de Iaxe horizontal et constituant deux points d'appui internes "a", "b" audit pivot, ledit support comprenant egalement deux bras lateraux, paralleles aux bras centraux, mais decales de ceux-ci vers I'arriere, selon une valeur sensiblement egale au diametre du pivot pour constituer deux points de contre-appui externe "c, "d" qui associes au point d'appui centraux "a", "b' forment un siege d'axe horizontal au pivot du timon, pour une retenue longitudinale en X de celui-ci, - les bras centraux du support forment des appuis pour une retenue verticale en Z du pivot, - les bras centraux du support sont espaces run de I'autre selon une distance sensiblement egale a la distance entre les extremites du timon pour lui constituer des butees laterales "e", "f" et assurer une retenue en translation en Y pour ne permettre It also has the effect of facilitating and therefore accelerating the maintenance operations on the drawbars. It also has the advantage of being limited to two pieces of construction, rune and the other being made from steel son economically able to produce on automatic machines programmed for series, and this without stamping, punching, turning, milling, any machining operation in fact. The present invention also relates to all the features that will follow and which should be considered in isolation or in all their possible technical combinations: - the drawbar is connected to the chassis through the means of articulation formed on the one hand by a horizontal pivot secured to the ends of the drawbar and forming a T with it, said horizontal pivot having as main axis Iaxe horizontal, and secondly, by a fixed support secured to the frame adapted to lock in translation the horizontal pivot along the X axes, Y and Z, the fixed support comprises two central arms parallel to each other and spaced apart from one another to allow free rotation of the drawbar around the horizontal axis and constituting two internal bearing points "a", "b" to said pivot , said support also comprising two lateral arms, parallel to the central arms, but shifts thereof towards the rear, according to a value substantially equal to the diameter of the pivot for constituting r two points of external counter-support "c," d "which associated with the central point of support" a "," b 'form a seat of horizontal axis to the pivot of the drawbar, for a longitudinal retention in X of this- ci - the central arms of the support form supports for a vertical retention Z of the pivot, the central arms of the support are run spaces of the other at a distance substantially equal to the distance between the ends of the drawbar to constitute him Lateral stop "e", "f" and provide translation restraint in Y to allow

3 que la seule rotation du pivot et son immobilisation selon tous les axes X, Y, Z, - le support est realise a partir d'un profile filiforme metallique conforme pour se refermer sur lui-meme et definir une fenetre centrale ouverte a sa partie inferieure pour permettre le libre debattement angulaire du timon, - le timon est constitue par deux bras paralleles dont I'ecartement externe "d" correspond sensiblement a celui D des bras centraux, - les bras constituant le timon sont rapportes sur son pivot de maniere perpendiculaire et tangentielle a ceux-ci, et sont places vers I'exterieur, lorsque le timon est en position verticale relevee, de maniere a echapper aux butees laterales "e" ou "f" constituees par les bras centraux, - le timon se prolonge a sa partie inferieure, a proximite de son pivot, par une partie coudee vers I'arriere, lorsque le timon est en position verticale relevee, se prolongeant par une partie contrecoudee perpendiculairement dans le sens lateral, pour permettre I'accrochage d'un element de rappel elastique dispose entre I'extremite du contre-coude et un element d'accrochage fixe du chassis, de maniere a ramener le timon automatiquement dans une position proche de la verticale dans une position de repos et a exercer un effort constant en position d'accrochage avec un chariot le precedant, afin d'eviter le decrochage d'un chariot par rapport a I'autre. L'invention concerne egalement un procede de demontage du timon. Selon ('invention, le demontage du timon se fait sans outil et comprend quatre etapes : - une premiere etape de positionnement du timon dans la zone angulaire de montage/demontage, - une deuxieme etape de translation horizontale du pivot selon la direction Y dans le sens Fl rendant libre une premiere extremite du pivot horizontal, - une troisieme etape de pivotement du pivot selon la direction X dans le sens F2 de facon a desengager rune des extremites du pivot horizontal du support fixe, une quatrieme etape de translation du pivot dans le plan 5 (X, Y) dans le sens F3 de faron a liberer I'autre extremite du pivot horizontal du support fixe. La description qui va suivre est donnee a titre d'exemple non limitatif et fera mieux comprendre comment ('invention peut titre realisee, en reference aux dessins annexes sur lesquels: 10 Ia figure 1 represente en perspective un chariot autoporteur equipe d'un timon amovible selon ('invention, la figure 2 represente en perspective, a echelle agrandie, un systeme d'articulation d'un timon selon la figure 1, la figure 3 represente en plan, a echelle agrandie, un 15 systeme d'articulation d'un timon selon la figure 1, les figures 4, 5, 6 et 7 representent en perspective une articulation selon les figures 2 et 3 respectivement selon les differentes phases de demontage du timon par rapport au chariot, les figures 8, 9 et 10 representent schematiquement des 20 vues laterales du timon et de sa zone d'articulation par rapport au chariot respectivement en position de repos, en position d'utilisation et en position de demontage, Ia figure 11 est une vue du detail selon la figure 10, a echelle agrandie, et 25 Ia figure 12 est une vue laterale d'un chariot equipe d'un timon et d'une articulation par rapport audit chariot selon ('invention montrant les differentes zones correspondant a la trajectoire du timon depuis ('une quelconque des zones d'utilisation normale ou anormale jusqu'a une zone de 30 montage/demontage du timon. Le chariot 1 globalement designe sur les figures comprend un chassis 2 constituant une structure de base qui est formee par un cadre en profile 3 et sous lequel sont disposees des roues directionnelles 4 et des roues non directionnelles 5. 3 that the only rotation of the pivot and its immobilization along all the axes X, Y, Z, - the support is made from a conformal metallic filiform profile to close on itself and define a central window open to its part lower to allow free angular movement of the drawbar, - the drawbar is constituted by two parallel arms whose outer space "d" corresponds substantially to that D of the central arms, - the arms constituting the drawbar are reported on its pivot perpendicularly and tangential to these, and are placed outwards, when the drawbar is in the raised vertical position, so as to escape the lateral stop "e" or "f" formed by the central arms, - the drawbar is extended to its lower part, close to its pivot, by a part bent towards the rear, when the drawbar is in raised vertical position, extending by a part contrecoudee perpendicularly in the lateral direction, to allow the access rocking of an elastic return member disposed between the end of the against-elbow and a fixed attachment element of the frame, so as to bring the drawbar automatically to a position close to the vertical in a rest position and to exercise a constant effort in the attachment position with a carriage preceding it, to avoid the stall of a carriage relative to the other. The invention also relates to a method for dismounting the drawbar. According to the invention, the dismounting of the drawbar is done without tools and comprises four steps: a first step of positioning the drawbar in the angular zone of assembly / disassembly; a second step of horizontal translation of the pivot in the direction Y in the direction F1 making free a first end of the horizontal pivot, - a third step of pivoting the pivot in the direction X in the direction F2 so as to engage rune ends of the horizontal pivot of the fixed support, a fourth step of translation of the pivot in the plane 5 (X, Y) in the F3 direction of the end to release the other end of the horizontal pivot of the fixed support The following description is given by way of nonlimiting example and will make it easier to understand how Referring to the accompanying drawings, in which: FIG. 1 shows in perspective a self-supporting carriage equipped with a detachable drawbar according to the invention, FIG. 2 is a perspective view, on an enlarged scale; ie, a drawbar articulation system according to FIG. 1, FIG. 3 shows in plan, on an enlarged scale, a drawbar articulation system according to FIG. 1, FIGS. 4, 5, 6 and 7 represent in perspective an articulation according to FIGS. 2 and 3 respectively according to the different disassembly phases of the drawbar relative to the carriage, FIGS. 8, 9 and 10 schematically represent lateral views of the drawbar and its articulation zone with respect to With the carriage respectively in the rest position, in the position of use and in the disassembly position, FIG. 11 is a detail view according to FIG. 10, on an enlarged scale, and FIG. 12 is a side view of a teamed cart. a drawbar and a hinge relative to said trolley according to the invention showing the different areas corresponding to the drawbar trajectory from any of the normal or abnormal use areas to a mounting / dismounting area of the drawbar. The carriage 1 generally designated in the figures comprises a frame 2 constituting a basic structure which is formed by a frame in profile 3 and under which are arranged directional wheels 4 and non-directional wheels 5.

Le chassis 2 est muni dans une zone centrale d'extremite avant d'un timon articule 6 susceptible de cooperer avec un crochet d'attelage 7 d'un autre chariot ou d'un chariot moteur le precedant. The frame 2 is provided in a central end zone before a articulated drawbar 6 capable of cooperating with a coupling hook 7 of another carriage or a motor carriage the preceding.

Alors comme le montre bien les figures et plus particulierement les figures 2 et 3, le timon 6 est relie au chassis 2 par I'intermediaire d'un moyen d'articulation 8 permettant au timon 6 d'etre libre en rotation autour d'un axe horizontal 30 depuis une zone angulaire d'utilisation normale I ou anormale II, III jusqu'a au moins une zone angulaire de montage/demontage IV du timon 6 sans outil. Le moyen d'articulation 8 est constitue d'une part par un pivot horizontal 9 solidaire des extremites 6a, 6b du timon 6 et formant un T avec celui-ci. Le pivot horizontal 9 a comme axe principal Iaxe horizontal 30. Et d'autre part, le moyen d'articulation 8 est constitue par un support fixe 10 solidaire du chassis 2 apte a bloquer en translation le pivot horizontal 9 suivant les axes X, Y et Z. Le support fixe 10 est constitue par deux bras centraux 11 et 12 paralleles entre eux et distants run de I'autre de sorte a permettre la libre rotation du timon (6) autour de Iaxe horizontal (30) selon un plan vertical constituant deux plans d'appui internes "a", "b" audit pivot 9. Le support 10 comprend egalement deux bras lateraux 13 et 14 paralleles aux bras centraux 11 et 12, mais decales de ceux-ci vers I'arriere selon une valeur sensiblement egale au diametre du pivot 9 pour constituer deux points de contre-appui externes "c", "d", qui associes aux points d'appui centraux "a", "b" forment un siege d'axe horizontal au pivot 9 du timon 6 pour une retenue longitudinale en X de celui-ci, le rendant rotatif mais non glissant. Comme le montre egalement les figures, les bras centraux 11 et 12 du support 10 forment des appuis en arc de cercle pour une retenue verticale en Z du pivot 9. Comme le montre la figure 11, les points d'appuis peuvent titre au nombre de six (trois points d'appuis P1, P2 et P3 de chaque cote du timon 6, par symetrie). Then as shown in the figures and more particularly in Figures 2 and 3, the drawbar 6 is connected to the frame 2 by means of a hinge means 8 allowing the drawbar 6 to be free to rotate around a horizontal axis 30 from an angular zone of normal use I or abnormal II, III up to at least one angular zone of assembly / disassembly IV of the drawbar 6 without tools. The hinge means 8 is formed on the one hand by a horizontal pivot 9 secured to the ends 6a, 6b of the drawbar 6 and forming a T with it. The horizontal pivot 9 has as main axis Iaxe horizontal 30. And secondly, the hinge means 8 is constituted by a fixed support 10 secured to the frame 2 adapted to lock in translation the horizontal pivot 9 along the X, Y axes and Z. The fixed support 10 is constituted by two central arms 11 and 12 parallel to one another and spaced apart from one another so as to allow free rotation of the drawbar (6) around the horizontal axis (30) in a vertical plane constituting two support pads internal "a", "b" to said pivot 9. The support 10 also includes two lateral arms 13 and 14 parallel to the central arms 11 and 12, but shifts thereof to the rear according to a value substantially equal to the diameter of the pivot 9 to constitute two external counter-support points "c", "d", which associated with the central support points "a", "b" form a seat of horizontal axis at the pivot 9 of the drawbar 6 for an X longitudinal retention thereof, making it rotatable but not slippery. As also shown in the figures, the central arms 11 and 12 of the support 10 form supports in an arc of a circle for a vertical retaining Z of the pivot 9. As shown in Figure 11, the support points can title in the number of six (three support points P1, P2 and P3 of each side of the drawbar 6, by symmetry).

Par ailleurs, les bras centraux 11 et 12 du support 10 sont espaces I'un de I'autre selon une distance sensiblement egale a la largeur de I'extremite 6a, 6b du timon 6 pour lui constituer des butees laterales et assurer une retenue en translation en Y, pour ne permettre que la seule rotation du pivot 9 et son immobilisation selon tous les axes X, Y, Z. Le support 10 peut titre realise a partir d'un profile filiforme metallique conforme pour se refermer sur lui-meme avec une fenetre centrale 17 ouverte a sa partie inferieure pour permettre le libre debattement angulaire du timon 6. Selon le present exemple de realisation, le timon 6 est constitue par deux bras paralleles 6a, 6b, dont I'ecartement externe "d" correspond sensiblement a celui D des bras centraux 11, 12. Selon une autre caracteristique de ('invention, Ies bras 6a, 6b constituant le timon 6 sont rapportes au le pivot 9 de maniere perpendiculaire et tangentielle a ceux-ci et sont places vers I'exterieur lorsque le timon 6 est en position verticale relevee. Selon une autre caracteristique de ('invention, le timon 6 se prolonge a sa partie inferieure 6b, a proximite de son pivot 9, par une partie 18 coudee vers I'arriere, lorsque le timon 6 est en position verticale relevee, se prolongeant par une partie contrecoudee 19 perpendiculairement dans le sens lateral pour permettre I'accrochage d'un element de rappel elastique 20 dispose entre I'extremite du contre-coude 19 et un element d'accrochage fixe 21 du chassis 2, de maniere a ramener le timon 6 automatiquement dans une position proche de la verticale dans une position de repos et a exercer un effort constant en position d'accrochage avec un chariot le precedant, afin d'eviter le decrochage de run par rapport a I'autre. Furthermore, the central arms 11 and 12 of the support 10 are spaced apart from one another by a distance substantially equal to the width of the end 6a, 6b of the drawbar 6 to constitute side stops and ensure retention translation in Y, to allow only the rotation of the pivot 9 and its immobilization along all the axes X, Y, Z. The support 10 can title achieved from a filiform metal profile compliant to close on itself with a central window 17 open at its lower part to allow free angular movement of the drawbar 6. According to the present embodiment, the drawbar 6 is constituted by two parallel arms 6a, 6b, the outer space "d" substantially corresponds to that D of the central arms 11, 12. According to another characteristic of the invention, the arms 6a, 6b constituting the drawbar 6 are attached to the pivot 9 perpendicularly and tangentially to these and are placed outwards when the drawbar 6 is in a raised vertical position. According to another characteristic of the invention, the drawbar 6 is extended at its lower part 6b, close to its pivot 9, by a part 18 bent towards the rear, when the drawbar 6 is in the upright raised position, extending by a part contrecoudee 19 perpendicularly in the lateral direction to allow the hooking of a resilient biasing element 20 disposed between the end of the against-elbow 19 and a fixed fastening element 21 of the frame 2, so as to bring back the drawbar 6 automatically in a position close to the vertical in a rest position and exert a constant effort in the latching position with a carriage preceding it, in order to avoid the stall run with respect to the other.

Dans un mode de realisation particulier, la partie 18 coudee peut titre coudee vers I'arriere perpendiculairement. La figure 12 resume tres bien les zones angulaires que le timon 6 peut parcourir. La zone angulaire I correspond a une zone d'utilisation 35 normale. Elie est d'un peu plus de 115 . La zone angulaire II correspond a une zone d'utilisation anormale, mais sans autant permettre le decrochage du timon 6. Elle est d'un peu plus de 105 . La zone angulaire Ill correspond a une zone d'utilisation egalement anormale. Elle est d'un peu moins de 60 . Quant a la zone angulaire IV, elle correspond a la zone angulaire de montage/demontage du timon 6. EIIe est de quelques degres. Le montage/demontage ne peut avoir lieu que dans cette petite zone angulaire de montage/demontage IV. L'articulation est ainsi parfaitement securisee. In a particular embodiment, the portion 18 bent can title elbows back perpendicularly. Figure 12 summarizes very well the angular areas that the drawbar 6 can travel. The angular area I corresponds to a normal area of use. Elie is a little over 115. The angular zone II corresponds to an abnormal area of use, but without allowing the staking of the drawbar 6 as much. It is a little more than 105. The angular zone Ill corresponds to a zone of use also abnormal. She is a little under 60. As for the angular zone IV, it corresponds to the angular zone of assembly / disassembly of the drawbar 6. It is a few degrees. The assembly / disassembly can take place only in this small angular zone of assembly / disassembly IV. The joint is perfectly secure.

Les figures 10 et 11 montrent bien la zone angulaire de demontage du timon 6, les fleches j1 et j2 montrent le jeu entre le timon 6 et le support 10 permettant le coulissement lorsque le timon est dans cette position, c'est-a-dire une position de demontage. Figures 10 and 11 show the angular zone of disassembly of the drawbar 6, the arrows j1 and j2 show the clearance between the drawbar 6 and the support 10 allowing the sliding when the drawbar is in this position, that is to say a disassembly position.

L'invention concerne egalement un procede de demontage du timon 6 sans outil. Les figures 4, 5, 6 et 7 montrant les differentes phases de demontage sont a rapprocher de la figure 10 montrant en vue laterale le timon 6 en position de demontage, c'est-a-dire en zone IV Le demontage du timon 6 sans outil comprend quatre etapes : - une premiere etape de positionnement du timon 6 dans la zone angulaire de montage/demontage IV, - une deuxieme etape de translation horizontale du pivot 9 25 selon la direction Y dans le sens Fl rendant libre une extremite du pivot horizontal 9a (voir figure 5), - une troisieme etape de pivotement du pivot 9 selon la direction X dans le sens F2 de fagon a desengager ('extremite du pivot horizontal 9a du support fixe 10 (voir figure 6), 30 - une quatrieme etape de translation du pivot 9 dans le plan (X, Y) dans le sens F3 de fagon a liberer I'autre extremite du pivot horizontal 9b du support fixe 10 (voir figure 7). The invention also relates to a method of dismounting the drawbar 6 without tools. Figures 4, 5, 6 and 7 showing the different disassembly phases are closer to Figure 10 showing a side view of the drawbar 6 in disassembly position, that is to say in Zone IV disassembly of the drawbar 6 without tool comprises four steps: - a first step of positioning the drawbar 6 in the angular zone of assembly / disassembly IV, - a second step of horizontal translation of the pivot 9 25 in the direction Y in the direction Fl making free one end of the horizontal pivot 9a (see FIG. 5), a third stage of pivoting of the pivot 9 in the direction X in the direction F2 so as to disengage (end of the horizontal pivot 9a of the fixed support 10 (see FIG. 6), 30 - a fourth step translation of the pivot 9 in the plane (X, Y) in the direction F3 so as to release the other end of the horizontal pivot 9b of the fixed support 10 (see Figure 7).

Claims

1. self-supporting trolley (1) comprising a frame (2) constituting a basic structure formed by a profile (3), chassis under which are arranged wheels (4), (5) directional or not and provided in a central zone d front end of an articulated drawbar (6) capable of cooperating with a towing hook (7) for towing by any means, characterized in that it comprises a hinge means (8) allowing the drawbar (6 ) to be free to rotate about a horizontal axis (30) from any of the angular areas of normal (I) or abnormal (II and III) use to an angular mounting / dismounting (IV) zone of drawbar (6) without tools.

2. Trolley according to claim 1, characterized in that the drawbar (6) is retained to the frame (2) through the hinge means (8) formed on the one hand by a horizontal pivot (9) integral with ends (6a, 6b) of the drawbar (6) and forming a T with it, Iedit horizontal pivot (9) having as main axis Iaxe horizontal (30), and secondly, by a fixed support (10) solidaire the frame (2) capable of locking in translation the horizontal pivot (9) along the X, Y and Z axes.

3. Trolley according to claim 2, characterized in that the fixed support (10) comprises two central arms (11, 12) parallel to each other and spaced run from each other to allow the free rotation of the drawbar (6) around Iaxe horizontal (30) and constituting two internal bearing points "a", "b" to said pivot (9), said support (10) also comprising two lateral arms (13, 14), parallel to the central arms (11, 12) but shifts therefrom to the rear, by a value substantially equal to the diameter of the pivot (9) to form two points of external counter-support "c," d "associated with the central point of support" a " , "b 'form a seat of horizontal axis to the pivot (9) of the drawbar (6), for a longitudinal retention X thereof.

4. Trolley according to claim 3, characterized in that the central arms (11, 12) of the support (10) form supports for a vertical retention Z of the pivot (9).

5. Trolley according to rune of claims 3 or 4, characterized in that the central arms (11, 12) of the support (10) are spaced from each other by a distance substantially equal to the distance between the ends (6a , 6b) of the drawbar (6) for constituting it of the "e", "f" lateral stops and to provide translation retention in Y to allow only the rotation of the pivot and its immobilization along all the X, Y, Z axes. .

6. Trolley according to rune of claims 1 to 5, characterized in that the support (10) is made from a metal filiform conformal profile to close on itself with a central window (17) open at its lower part to allow the free angular movement of the drawbar (6).

7. Trolley according to one of claims 1 to 6, characterized in that the drawbar (6) is constituted by two parallel arms (6a, 6b) whose outer space "d" substantially corresponds to that D of the central arms (11, 12).

8. Trolley according to claim 7, characterized in that the arms (6a, 6b) constituting the drawbar (6) are attached to its pivot (9) in a manner perpendicular and tangential to them, and are placed outwardly. when the drawbar (6) is in the raised vertical position, so as to escape the later-ales "e" or "f" formed by the central arms (11, 12).

9. Trolley according to rune of claims 1 to 8, characterized in that the drawbar (6) is extended at its lower part (6b), close to its pivot (9), by a portion (18) curved towards the rear when the drawbar (6) is in a raised upright position, extending by a counter-bent portion (19) perpendicularly in the lateral direction, to allow the hooking of a resilient biasing member (10) disposed between the end against the elbow (19) and a fixed fastening element (21) of the frame (2), so as to bring the drawbar (6) automatically to a position close to the vertical in a rest position and exert a force constant in the hooking position with a carriage the previous, to avoid the stall of a carriage relative to the other.

10. A method of disassembling the drawbar (6) according to any one of claims 1 to 8, characterized in that the disassembly of the drawbar (6) without tools comprises four steps: - a first step of positioning the drawbar (6) in the angular zone of assembly / disassembly (IV), - a second stage of horizontal translation of the pivot (9) 10 in the direction Y in the direction F1 making free an end of the horizontal pivot (9a), - a third stage of pivoting of the pivot (9) in the direction X in the direction F2 to engage said end of the horizontal pivot (9a) of the fixed support (10), 15 - a fourth step of translation of the pivot (9) in the plane (X, Y) in the direction F3 so as to release the other end of the horizontal pivot (9b) of the fixed support (10).