(19)
(11)EP 2 417 892 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
08.06.2016 Bulletin 2016/23

(21)Application number: 09846852.3

(22)Date of filing:  30.06.2009
(51)International Patent Classification (IPC): 
A47L 9/28(2006.01)
A47L 11/24(2006.01)
A47L 9/04(2006.01)
(86)International application number:
PCT/KR2009/003562
(87)International publication number:
WO 2011/002113 (06.01.2011 Gazette  2011/01)

(54)

ROBOT CLEANER

REINIGUNGSROBOTER

ROBOT NETTOYEUR


(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

(43)Date of publication of application:
15.02.2012 Bulletin 2012/07

(60)Divisional application:
16158471.9

(73)Proprietor: LG Electronics Inc.
Seoul 150-721 (KR)

(72)Inventors:
  • KIM, Sung-Guen
    Changwon-si Gyeongsangnam-do 641-711 (KR)
  • SHIM, In-Bo
    Changwon-si Gyeongsangnam-do 641-711 (KR)
  • YIM, Byung-Doo
    Changwon-si Gyeongsangnam-do 641-711 (KR)
  • KIM, Bong-Ju
    Changwon-si Gyeongsangnam-do 641-711 (KR)
  • SUNG, Ji-Hoon
    Changwon-si Gyeongsangnam-do 641-711 (KR)

(74)Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB 
Siebertstrasse 3
81675 München
81675 München (DE)


(56)References cited: : 
WO-A1-2007/065034
KR-A- 20040 105 509
KR-A- 20060 131 419
US-A- 3 671 996
US-A1- 2006 032 013
WO-A1-2008/091199
KR-A- 20060 042 801
KR-A- 20080 000 186
US-A- 4 847 944
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    TECHNICAL FIELD



    [0001] The present disclosure relates to a robot cleaner.

    BACKGROUND ART



    [0002] A robot cleaner refers to a cleaning apparatus which removes dust or foreign substances from the floor of a working area it moves in without user control. It determines locations of obstacles or walls by using its sensor or camera and avoids them by using its location data while collecting dust along its path of movement.

    [0003] Such a robot cleaner includes an agitator to increase the efficiency of sucking the dust scattered in its working area. Such an agitator scatters the dust in the working area while rotating by receiving a torque from the motor of the cleaner.

    [0004] Generally, a belt connecting the rotation shaft of the suction motor with the body of the agitator is used to transmit the torque to the agitator, and the agitator body includes an inwardly recessed belt connecting part to connect the belt.

    [0005] However, when the agitator has to be cleaned, the belt connecting the suction motor with the agitator body has to be removed first and then the agitator has to be taken apart.

    [0006] After the cleaning is completed, the belt has to be installed at the agitator body and then the agitator has to be fixed rotatably inside the dust suction unit, which makes the disassembly and installation of the agitator difficult.

    [0007] WO 2008/091199 A1 discloses a vacuum cleaner nozzle having a brush. The brush includes a first end provided with axially extending projections, which can engage with the recesses of the driven wheel provided at the cleaner nozzle. Furthermore, the brush includes a second end provided with a free rotating axle spindle, which is rotatable journalled on the end of the brush and can be positioned in a rectangular recess provided at the cleaner nozzle.

    [0008] A robot cleaner according to the preamble of claim 1 is already known e.g. from WO-A-2007065034.

    DISCLOSURE OF THE INVENTION


    TECHNICAL PROBLEM



    [0009] Embodiments provide a robot cleaner an agitator can be emoved from and installed at with ease.

    [0010] Embodiments also provide a robot cleaner which rotates an agitator by using a torque of a motor to rotate a side brush.

    TECHNICAL SOLUTION



    [0011] According to the invention, a robot cleaner includes the features of claim 1.

    ADVANTAGEOUS EFFECTS



    [0012] According to the invention, a driving force transmitter, such as a belt and a chain, which transmits a driving force to the body of the agitator is not coupled directly but a fixing shaft forming a rotation shaft is connected to a driving motor and put in a rotating holder.

    [0013] The holder includes a shaft insertion part which corresponds in shape to the fixing shaft, and the fixing shaft put in the shaft insertion part does not rotate alone but rotates together with the holder in engagement.

    [0014] By a coupling hole formed at a side of the holder, the fixing shaft of the agitator may be put in the holder from the side of the holder, facilitating the installation of the agitator. Since the fixing shaft can be removed from the holder by pulling the agitator, the abovementioned agitator installation structure facilitates the disassembly of the robot cleaner of the embodiment when the robot cleaner has to be disassembled for cleaning or component replacement.

    [0015] The holder is connected to a side of a pulley transmitting the torque to the agitator, and a worm can be installed at the other side of the pulley to provide the torque to the side brush.

    [0016] By engaging a worm gear with the worm and connecting the side brush with the rotation shaft of the worm gear, the torque of the driving motor can be transmitted to the side brush as well as the agitator.

    [0017] The easy separation and installation of the agitator and the enablement of simultaneous rotation of the agitator and a side brush can improve user satisfaction.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0018] 

    Fig. 1 is a side view illustrating a robot cleaner according to an embodiment.

    Fig. 2 is a partially enlarged view illustrating the robot cleaner according to the embodiment.

    Fig. 3 is a perspective view illustrating an agitator according to the embodiment.

    Figs. 4 and 5 are views illustrating a dust suction unit of the robot cleaner according to the embodiment.

    Fig. 6 is a partially exploded perspective view illustrating a mounting structure of the agitator of the robot cleaner according to the embodiment.

    Fig. 7 is a view illustrating a coupled state of a gear housing and a housing cover which are main components according to the embodiment.

    Fig. 8 is a view illustrating an operation structure of the agitator and a side brush of the robot cleaner according to the embodiment work.

    Fig. 9 is a view illustrating a coupling relation for an operation of the side brush of the robot cleaner according to the embodiment.


    BEST MODE FOR CARRYING OUT THE INVENTION



    [0019] Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.

    [0020] Fig. 1 is a side view illustrating a robot cleaner according to an embodiment.

    [0021] A main body of a robot cleaner 1 of an embodiment includes a base 10 defining a lower portion of the robot cleaner 1, and a cover 20 covering an upper side of the base 10.

    [0022] The base 10 and the cover 20 define an exterior of the robot cleaner 1 by being coupled with each other. A suction motor configured to suck dust, a dust container, and a plurality of electrical components.

    [0023] The base 10 includes a caster 30 and a wheel 40 configured to move the robot cleaner 1, and a side brush 200 and an agitator 100 configured to scatter foreign substances in a working area.

    [0024] Fig. 2 is a partially enlarged bottom view illustrating the robot cleaner according to the embodiment.

    [0025] A dust suction unit 12 is disposed at a lower portion of the base 10 to suck dust therein.

    [0026] The dust suction unit 12 is a long and narrow opening formed in a horizontal direction of the base 10, and holders 300 are disposed at both sides of the dust suction unit 12 for the installation of the agitator 100.

    [0027] The holders 300, which hold the agitator 100 fitted in the holders 300, are configured to transmit a torque of a driving motor 400 (that will be described below) to the agitator 100.

    [0028] Fig. 3 is a perspective view illustrating the agitator according to the embodiment. Figs. 4 and 5 are views illustrating the dust suction unit of the robot cleaner according to the embodiment. Fig. 6 is an exploded perspective view illustrating a mounting structure of the agitator of the robot cleaner according to the embodiment.

    [0029] As illustrated in the drawings, fixing shafts 120 are disposed, protruding outwards, at both sides of the agitator 100, and shaft insertion parts 320 are disposed at the holders 300 to accommodate the fixing shafts 120. The shaft insertion part 320 is recessed in a shape corresponding to that of the fixing shaft 120 (refer to Figs. 3 and 4).

    [0030] The holders 300 are configured to transmit the torque of the driving motor 400, which is described below, to the agitator 100 inserted in the shaft insertion parts 320, and the shape of the shaft insertion part 320 varies depending on the shape of the fixing shaft 120.

    [0031] In other words, to transmit the torque to the fixing shaft 120, the fixing shaft 120 has to be accommodated by and rotate together with the shaft insertion part 320 in engagement so that the fixing shaft 120 accommodated by the shaft insertion part 320 does not idle.

    [0032] Therefore, the fixing shaft 120 may have a non-circular, i.e., oval or polygonal cylindrical, shape or at least one projection which protrudes outwards so that interference may be made between the fixing shaft 120 and the shaft insertion part 320. The shaft insertion part 320 may have a shape corresponding to the abovementioned shape.

    [0033] The depth of the recess of the shaft insertion part 320 may be the same as or slightly longer than the extent to which the fixing shaft 120 protrudes.

    [0034] The holders 300 are disposed at both sides of the dust suction unit 12 to support both sides of the agitator 100. At least one of the holders 300 has an opening in a side surface to form a coupling hole 340 so that the fixing shaft 120 may be inserted into from above.

    [0035] The length of the agitator 100 including the fixing shafts 120 is longer than the distance between the holders 300 disposed at both sides of the dust suction unit 12.

    [0036] In others words, the distance between the holders 300 may be equivalent to the length of the agitator 100 excluding the length of the fixing shafts 120 which are accommodated by the holder 300, or be shorter than the length of the agitator 100 including the length of the fixing shafts 120.

    [0037] The agitator 100 is hard to be installed horizontally. When the agitator 100 is installed, the fixing shaft 120 disposed at one side of the agitator 100 is put first diagonally in one of the holders 300, and then the other fixing shaft 120 is inserted in the other holder 300.

    [0038] Here, the coupling hole 340 may not be formed in the holder 300 in which the fixing shaft 120 is put first. However, the coupling hole 340 has to be formed at the other holder 300 in which the other fixing shaft 120 is put.

    [0039] By placing the other fixing shaft 120 at the coupling hole 340 and pressing the other fixing shaft 120 so that the agitator 100 may level off inside the dust suction unit 12, the other fixing shaft 120 may be inserted in the other holder 300 passing through the coupling hole 340.

    [0040] For the agitator 100 having the abovementioned installation structure to rotate, the torque of the driving motor 400 has to be transmitted to the holder 300.

    [0041] The driving motor 400, which is disposed separately from the suction motor inside the base 10, rotates the agitator 100 and the side brush 200. Also, the driving motor 400 is disposed on a side of gear housings 500 disposed at both sides of the dust suction unit 12 to maintain a fixed position thereof.

    [0042] Accommodated in the gear housing 500 are a pinion gear 420 connected to the rotation shaft of the driving motor 400 for synchronous rotation, and a pulley 540 which is coupled with the pinion gear 420 by a driving force transmitter 510 such as a belt or a chain and rotates together with the pinion gear 420.

    [0043] To this end, the gear housing 500 includes a surface facing the agitator 100 and a boundary surface protruding from an edge thereof. Although not illustrated, formed at the surface facing the agitator 100 in the form of a bore or a hole are a motor shaft mounting hole which the rotation shaft of the driving motor 400 passes through and an exposed holder part which the fixing shaft 120 is put therein.

    [0044] The housing gear 500 is covered by a housing cover 520 with the pinion gear 420, the pulley 520, and the driving force transmitter 510 rotatably fixed.

    [0045] In other words, a space is formed in the gear housing 500 with the housing cover 520 coupled with the boundary surface of the gear housing 500 or the housing cover 520 fixed covering the boundary surface in entirety. The pinion gear 420, the pulley 520, and the driving force transmitter 510 may be fixed in the space by a bush (not illustrated), which allows the rotation shafts of the pinion gear 420 and the pulley 520 to be fixed, at the inner side of the gear housing 500 and the housing cover 520.

    [0046] The holder 300, fixed to the pulley 540, rotates synchronously with the pulley 540. The installation position of the holder 300 fixed to the pulley 540 is exposed to the exposed holder part of the gear housing 500, and the fixing shaft 120 may be coupled with the holder 300.

    [0047] When the fixing shaft 120 is installed at the holder 300, the torque of the driving motor 400 is transmitted to the fixing shaft 120 through the pinion gear 420, the driving force transmitter 510, the pulley 540, and the holder 300, rotating the agitator 100 and allowing the dust in a working area to be scattered.

    [0048] The housing cover 520 further includes a worm gear receiver 522 and a worm receiver 524 to accommodate a worm 560 and a worm gear 580 configured to rotate the side brush 200.

    [0049] Fig. 7 is a view illustrating a coupled state of a gear housing and a housing cover which are main components according to the embodiment.

    [0050] As illustrated, the worm receiver 524 is disposed at the housing cover 520 coupled with the gear housing 500 to accommodate the worm 560 which has the same rotation shaft as the pulley 540 or a separate rotation shaft connected to the rotation shaft of the pulley 540.

    [0051] The torque of the driving motor 400 may be transmitted to the agitator 100 and the worm 560 at the same time because the worm 560 is positioned on the same line as the pulley 540, the holder 300, and the fixing shaft 120 of the agitator 100.

    [0052] Intersecting with the worm receiver 524, the worm gear receiver 522 allows the worm 560 and the worm gear 580 to rotate together with each other in engagement, and the side brush 200 is coupled with the rotation shaft of the worm gear 580.

    [0053] Fig. 8 is a view illustrating an operation structure of the agitator and the side brush of the robot cleaner according to the embodiment work, and Fig. 9 is a view illustrating a coupling relation for an operation of the side brush of the robot cleaner according to the embodiment.

    [0054] As illustrated, the pinion gear 420 is coupled with the rotation shaft of the driving motor 400 which passes through the motor shaft mounting hole formed at the gear housing 500.

    [0055] Since one side of the belt-shaped driving force transmitter 510 is wound at the pinion gear 420 and the pulley 540 accommodated inside the gear housing 500 is wound at the other side, the pinion gear 420 and the pulley 540 may rotated together when the driving motor 400 rotates.

    [0056] The fixing shaft 120 of the agitator 100 may be inserted because the holder 300 is coupled with the pulley 540 at the surface facing the agitator 100. The torque may be transmitted to the side brush 200 because the worm 560 is coupled with the pulley 540 at the surface toward the side brush 200.

    [0057] Here, for smooth rotation, a bearing 582 may be further disposed at both sides of the rotation shaft of the pulley 540 and the worm 560.

    [0058] The worm gear 580, accommodated by the worm gear receiver 522, is fixed at the worm 560 in such a manner that the worm gear 580 may rotate in engagement with the worm 560. In addition, the side brush 200 is coupled with the rotation shaft of the worm gear 580 for synchronous rotation. In the abovementioned manner, the torque of the driving motor 400 is transmitted to the side brush 200.


    Claims

    1. A robot cleaner comprising:

    a main body in which a dust suction unit (12) is disposed;

    holders (300) disposed at both sides of the dust suction unit; and

    an agitator (100) installed on the holders (300) to remove foreign substances from a working area,

    characterized in that the agitator comprises fixing shafts (120) having a non-circular shape and providing a rotation center, and the holders (300) comprise a shaft insertion part (320) in which the fixing shaft is inserted, and

    one of the holders has an opening in a side surface to form a coupling hole (340) so that one of the fixing shafts (120) can be inserted therethrough,

    wherein a distance between the holders (300) is equivalent to a length of the agitator (100) excluding the fixing shafts (120) and less than a length of agitator (100) including the fixing shafts (120).


     
    2. The robot cleaner according to claim 1, wherein the coupling hole (340) is opened with a length corresponding to a width of the fixing shaft (120) in a side of the holder (300).
     
    3. The robot cleaner according to claim 1, wherein in a state where one fixing shaft (120) is mounted on the shaft insertion part (320) of one holder (300), the other fixing shaft (120) passes through a coupling hole (340) of the other holder (300) and is mounted on the shaft insertion part (320).
     
    4. The robot cleaner according to claim 1, wherein the shaft insertion part (320) has a depth recessed corresponding to a protrusion length of the fixing shaft (120) or greater than the protrusion length of the fixing shaft (120).
     
    5. The robot cleaner according to claim 1, further comprising:

    a pinion gear (420) fixed to a rotation shaft of a driving motor (400) for synchronous rotation;

    a pulley (540) coupled with the holder (300) for synchronous rotation; and

    a driving force transmitter (510) connecting the pulley (540) with the pinion gear (420),

    wherein the pinion gear (420), the pulley (540), and the driving force transmitter (510) are disposed between the driving motor (400) and the holder (300).


     
    6. The robot cleaner according to claim 5, wherein the pinion gear (420), the pulley (540), and the driving force transmitter (510) are disposed in an inner space defined by a gear housing (500) to which the driving motor (400) is fixed and a housing cover (520) coupled with the gear housing (500).
     
    7. The robot cleaner according to claim 5, wherein a worm (560) for rotation of a side brush (200) is connected to the pulley (540) for synchronous rotation.
     
    8. The robot cleaner according to claim 5, wherein a worm receiver (524) and a worm gear receiver (522) for rotation of a side brush (200) are disposed in the housing cover (520), and a worm (560) disposed in the worm receiver (524) is connected to the pulley (540) and holder (300) so that the worm (560) has the same rotation center as those of the rotation shafts of the pulley (540) and the holder (300).
     


    Ansprüche

    1. Reinigungsroboter mit:

    einem Hauptkörper, in dem eine Staubansaugeinheit (12) angeordnet ist;

    Haltern (300), die auf beiden Seiten der Staubansaugeinheit angeordnet sind; und

    einem Rührwerk (100), das am Halter (300) angebracht ist, um Fremdkörper von einem Arbeitsbereich zu entfernen,

    dadurch gekennzeichnet, dass das Rührwerk Befestigungsschäfte (120) aufweist, die eine nicht kreisförmige Form aufweisen und einen Drehpunkt bereitstellen, und die Halter (300) einen Schafteinsatzteil (320) aufweisen, in den der Befestigungsschaft eingesetzt ist, und

    einer der Halter eine Öffnung in einer Seitenfläche aufweist, um ein Kopplungsloch (340) zu bilden, so dass einer der Befestigungsschäfte (120) dort hindurch eingesetzt werden kann,

    wobei ein Abstand zwischen den Haltern (300) zu einer Länge des Rührwerks (100) mit Ausnahme der Befestigungsschäfte (120) äquivalent ist und kleiner als eine Länge des Rührwerks (100) einschließlich der Befestigungsschäfte (120) ist.


     
    2. Reinigungsroboter nach Anspruch 1, wobei das Kopplungsloch (340) mit einer Länge geöffnet ist, die eine Breite des Befestigungsschafts (120) in einer Seite des Halters (300) entspricht.
     
    3. Reinigungsroboter nach Anspruch 1, wobei in einem Zustand, wo ein Befestigungsschaft (120) an dem Schafteinsatzteil (320) von einem Halter (300) angebracht ist, der an dessen Befestigungsschaft (120) durch ein Kopplungsloch (340) des anderen Halters (300) geht und am Schafteinsatzteil (320) angebracht ist.
     
    4. Reinigungsroboter nach Anspruch 1, wobei der Schafteinsatzteil (320) eine Tiefe aufweist, die entsprechend einer Vorsprunglänge des Befestigungsschafts (120) oder mehr als die Vorsprunglänge des Befestigungsschafts (120) ausgespart ist.
     
    5. Reinigungsroboter nach Anspruch 1, der ferner aufweist:

    ein Ritzel (420), das an einer Drehwelle eines Antriebsmotors (400) zur synchronen Rotation befestigt ist;

    eine Riemenscheibe (540), die mit dem Halter (300) zur synchronen Rotation gekoppelt ist; und

    eine Antriebskraftübermittlungseinrichtung (510), die die Riemenscheibe (540) mit dem Ritzel (420) verbindet,

    wobei das Ritzel (420), die Riemenscheibe (540) und die Antriebskraftübermittlungseinrichtung (510) zwischen dem Antriebsmotor (400) und dem Halter (300) angeordnet sind.


     
    6. Reinigungsroboter nach Anspruch 5, wobei das Ritzel (420), die Riemenscheibe (540) und die Antriebskraftübermittlungseinrichtung (510) in einem Innenraum angeordnet sind, der durch ein Getriebegehäuse (500), an dem der Antriebsmotor (400) befestigt ist, und einen Gehäusedeckel (520) definiert wird, der mit dem Getriebegehäuse (500) gekoppelt ist.
     
    7. Reinigungsroboter nach Anspruch 5, wobei eine Schnecke (560) zur Rotation einer Seitenbürste (200) mit der Riemenscheibe (540) zur synchronen Rotation verbunden ist.
     
    8. Reinigungsroboter nach Anspruch 5, wobei eine Schneckenaufnahme (524) und eine Schneckengetriebeaufnahme (522) zur Rotation einer Seitenbürste (200) im Gehäusedeckel (520) angeordnet sind, und eine in der in der Schneckenaufnahme (524) angeordnete Schnecke (560) mit der Riemenscheibe (540) und dem Halter (300) verbunden ist, so dass die Schnecke (560) denselben Drehpunkt wie die Drehwellen der Riemenscheibe (540) und des Halters (300) aufweist.
     


    Revendications

    1. Robot nettoyeur comprenant :

    un corps principal où est contenue une unité d'aspiration de poussière (12) ;

    des supports (300) disposés de part et d'autre de l'unité d'aspiration de poussière ; et

    un agitateur (100) monté sur les supports (300) pour retirer les substances étrangères d'une surface de travail,

    caractérisé en ce que l'agitateur comporte des arbres de fixation (120) de forme non circulaire et présentant un centre de rotation, en ce que les supports (300) comportent une pièce de logement (320) d'arbre dans laquelle l'arbre de fixation est engagé, et

    en ce qu'un des supports présente une ouverture dans une surface latérale pour former un orifice d'accouplement (340) permettant qu'un des arbres de fixation (120) y soit engagé,

    où l'espacement entre les supports (300) est égal à la longueur de l'agitateur (100), arbres de fixation (120) non compris, et inférieur à la longueur de l'agitateur (100), arbres de fixation (120) compris.


     
    2. Robot nettoyeur selon la revendication 1, où l'orifice d'accouplement (340) est ouvert sur une longueur correspondant à la largeur de l'arbre de fixation (120) sur un côté du support (300).
     
    3. Robot nettoyeur selon la revendication 1, où, dans un état où un arbre de fixation (120) est monté sur la pièce de logement (320) d'arbre d'un support (300), l'autre arbre de fixation (120) travers un orifice d'accouplement (340) de l'autre support (300) et est monté sur la pièce de logement (320) d'arbre.
     
    4. Robot nettoyeur selon la revendication 1, où la pièce de logement (320) d'arbre présente une profondeur de renfoncement correspondant à la longueur de saillie de l'arbre de fixation (120), ou supérieure à la longueur de saillie de l'arbre de fixation (120).
     
    5. Robot nettoyeur selon la revendication 1, comprenant en outre :

    un engrenage à pignons (420) fixé sur un arbre rotatif d'un moteur d'entraînement (400) pour une rotation synchrone ;

    une poulie (540) reliée au support (300) pour une rotation synchrone ; et

    une transmission de force d'entraînement (510) reliant la poulie (540) à l'engrenage à pignons (420),

    l'engrenage à pignons (420), la poulie (540) et la transmission de force d'entraînement (510) étant disposés entre le moteur d'entraînement (400) et le support (300).


     
    6. Robot nettoyeur selon la revendication 5, où l'engrenage à pignons (420), la poulie (540) et la transmission de force d'entraînement (510) sont disposés dans un espace intérieur défini par un carter d'engrenage (500) sur lequel le moteur d'entraînement (400) est fixé, et un couvercle de carter (520) accouplé au carter d'engrenage (500).
     
    7. Robot nettoyeur selon la revendication 5, où une vis sans fin (560) pour la rotation d'une brosse latérale (200) est reliée à la poulie (540) pour une rotation synchrone.
     
    8. Robot nettoyeur selon la revendication 5, où un logement de vis sans fin (524) et un logement d'engrenage à vis sans fin (522) pour la rotation d'une brosse latérale (200) sont disposés dans le couvercle de carter (520), et une vis sans fin (560) disposée dans le logement d'engrenage à vis sans fin (524) est reliée à la poulie (540) et au support (300) de sorte qu'une vis sans fin (560) a le même centre de rotation que les arbres rotatifs de la poulie (540) et le support (300).
     




    Drawing
































    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description