EP2278907B1 - Wheeled sweeping unit - Google Patents

Wheeled sweeping unit Download PDF

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Publication number
EP2278907B1
EP2278907B1 EP09745481A EP09745481A EP2278907B1 EP 2278907 B1 EP2278907 B1 EP 2278907B1 EP 09745481 A EP09745481 A EP 09745481A EP 09745481 A EP09745481 A EP 09745481A EP 2278907 B1 EP2278907 B1 EP 2278907B1
Authority
EP
European Patent Office
Prior art keywords
sweeper
supporting wheel
sweeping
rotation
front supporting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09745481A
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German (de)
French (fr)
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EP2278907A1 (en
Inventor
Hans-Peter Wolf
Roland Schick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfred Kaercher SE and Co KG
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Alfred Kaercher SE and Co KG
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Application filed by Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP2278907A1 publication Critical patent/EP2278907A1/en
Application granted granted Critical
Publication of EP2278907B1 publication Critical patent/EP2278907B1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/24—Floor-sweeping machines, motor-driven
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4072—Arrangement of castors or wheels

Definitions

  • the invention relates to a mobile sweeper with a housing in which an electric motor driven sweeping roller is rotatably mounted, and with a hopper for receiving debris, wherein on the housing of the sweeping roller adjacent two front support wheels and at a distance to these at least one rear support wheel in each case Rotary axis are rotatably mounted.
  • Such sweepers are for example from the EP 1 199 971 B1 known. They can be moved along a surface to be cleaned, wherein by means of the sweeping brush debris can be picked up by the surface to be cleaned and transferred to the hopper.
  • Object of the present invention is to develop a sweeping device of the type mentioned in such a way that even when surface irregularities occur no danger that the sweeping roller is blocked or the sweeper tips.
  • the axes of rotation of the two front support wheels are offset relative to each other with respect to the main direction of movement of the sweeping device. Namely, the rotation axis of a first front support wheel is aligned coaxially with the rotation axis of the sweeping roller, and the rotation axis of the second front support wheel is positioned offset thereto.
  • Such a mounting space would have the disadvantage that in the main direction of movement of the sweeping device front edge regions of a surface to be cleaned from the sweeping roller could not be detected.
  • the arrangement of the axis of rotation of the first front support wheel coaxial with the axis of rotation of the sweeping roller has the additional advantage that there is no risk that the sweeping roller is blocked by uneven ground, because the arranged flush with the sweeping roller first front support wheel forms a kind of spacer for the sweeping roller, by defining a unique distance between the axis of rotation of the sweeping roller and the surface to be cleaned. There is thus virtually no danger that the sweeping roller of the surface to be cleaned in the case of unevenness approaches too much and then catch the bristles of the sweeping roller with the ground. Also, an increase of the reciprocating resistance of the sweeping roller due to Uneven floors can be avoided. An increased sweeping resistance would have increased power consumption of a sweeping roller driving electric motor and thus heating and loading of the engine result By the arrangement of the first front support wheel in alignment with the sweeping roller of the sweeping resistance of the sweeping roller can be kept low even on uneven ground.
  • the staggered arrangement of the axes of rotation of the two support wheels makes it possible to select a position in front of or behind the sweeping roller for the second front support wheel, so that tilting of the sweeping device can be counteracted.
  • the arrangement of the second front support wheel offset from the sweeping roller also has the advantage that the first front support wheel facing away from the end face of the sweeping roller can extend to the outer edge of the housing or even beyond.
  • lateral edge regions of a surface to be cleaned can be reliably detected by the sweeping roller.
  • the sweeping device according to the invention is thus characterized by a very good Randfitkeit. For example, floor areas which are immediately adjacent to a wall can be cleaned in a simple manner by means of the sweeping roller.
  • the sweeping roller according to the invention thus allows a near-sweeping sweeping.
  • the axis of rotation of the second front support wheel is arranged with respect to the main direction of movement of the sweeping device behind the sweeping roller. This gives the possibility to store the sweeping roller at the front end of the housing.
  • the second front support wheel is arranged immediately behind the sweeping roller. This increases the stability of the sweeper when moving along an uneven surface.
  • the diameter of the first front support wheel is greater than the diameter of the second front support wheel.
  • the largest possible diameter for the first front jockey wheel improves the driving characteristics of the sweeper.
  • a smaller diameter can be selected for the second front support wheel arranged offset to the first front support wheel. This reduces the required mounting space for the second front jockey wheel, without the driving characteristics of the sweeper are significantly affected.
  • the diameter of the first front support wheel is at least 8 cm, preferably about 10 cm.
  • the diameter of the second front support wheel is less than about 7 cm in a preferred embodiment of the invention.
  • the diameter of the first front support wheel is at least 1.3 times the diameter of the second front support wheel.
  • the end face of the sweeping roller facing away from the first front support wheel is preferably arranged transversely to the main direction of movement of the sweeping device at the same height as the second front support wheel. It is particularly advantageous if the end face of the sweeping roller facing away from the first front support wheel is particularly advantageous protrudes beyond the second front support wheel. Transverse to the main direction of movement of the sweeping device thus the second front support wheel is offset in a preferred embodiment of the invention in the direction of the central axis of the sweeping device inwards. This allows a sweeping close to the edges, since the bristles of the sweeping roller can extend laterally to the edge of a floor surface to be cleaned, without being hindered by the second front support wheel.
  • the sweeping device according to the invention has, in addition to the two front support wheels, at least one rear support wheel, which is freely rotatably mounted about an axis of rotation. It is advantageous if the at least one rear support wheel is rotatably mounted on a pivotable about a vertical pivot axis pivot carrier.
  • the at least one rear support wheel thus forms a steering wheel, which simplifies the process of the sweeping device along a surface, in particular an uneven surface.
  • the sweeping device has two rear support wheels. This avoids the risk that the sweeping device tilts along a surface about its longitudinal axis during the process.
  • the second front support wheel is arranged transversely to the main direction of movement of the sweeping device between a rear support wheel and the end face of the sweeping roller facing away from the first front support wheel.
  • the at least one rear support wheel has a smaller diameter than a front support wheel. Especially it can be provided that the diameter of the at least one rear support wheel is smaller than the diameter of the second front support wheel.
  • the sweeping roller is driven in sweeping device according to the invention by an electric motor.
  • the power supply of the electric motor can be done via a supply cable that can be connected to a power supply network or a generator.
  • the mobile sweeper has at least one rechargeable battery.
  • a power supply network or a generator is accessible.
  • the use of a rechargeable battery, which is equipped with lithium-ion cells, this has the particular advantage that the battery has virtually no self-discharge. So even if the sweeper remains unused for a long time, it is not always necessary to charge the battery first.
  • Lithium-ion cells also have the advantage that they are less sensitive to cold and that they have a relatively low weight.
  • a preferred embodiment of a mobile sweeping device 10 is shown schematically with a housing 12 surrounding a hopper 14.
  • the hopper 14 is designed in the manner of a drawer and can be pulled out of the housing at the back 16 of the housing, emptied and then pushed back into the housing 12.
  • a sweeping roller 20 is rotatably mounted about a rotation axis 21 within the housing.
  • the sweeping roller 20 is rotated by a known per se and therefore not shown in the drawing to achieve a better overview in the drawing.
  • the electric motor is disposed within the housing 12 in a central region in front of an on / off switch 22. Via a belt drive 24, the electric motor is in rotary connection with the sweeping roller.
  • the belt drive 24 comprises, as usual, a pulley 26, which is rotatably held on a rotatably mounted drive shaft 28 and around which a drive belt 30 is guided, which via a two-stage belt transmission and a non-rotatably coupled to the motor shaft pulley (not shown in the drawing) driven becomes.
  • the drive shaft 28 dives over a Driver 32 in a lateral recess 34 of a roller core 36 of the sweeping roller 20 a.
  • the drive shaft 28 is rotatably connected to the roller core 36 so that it can be rotated by the drive shaft 28 in rotation. From the roller core 36 are in the radial direction a plurality of bristles 38 from the outside, with the aid of a surface 40 can be cleaned.
  • a first front support wheel 41 is aligned with its axis of rotation 42 coaxial with the axis of rotation 21 of the sweeping roller 20.
  • the first front support wheel 41 thus acts as a spacer for the sweeping roller 20 and prevents a large sweeping resistance or even blocking the sweeping roller on uneven ground.
  • the power consumption of the electric motor is kept low and this in turn increases the life of the rechargeable battery 51, which supplies the electric motor with energy.
  • a second front support wheel 44 is relative to the main movement direction 45 of the sweeping device 10 to the rear offset from the axis of rotation 21 of the sweeping roller 20 and thus also offset from the axis of rotation 42 of the first front support wheel 41.
  • the axis of rotation of the second front support wheel 44 is occupied by the reference numeral 46 in the drawing.
  • Two rear support wheels 48, 49 are positioned at a distance to the front support wheels 41 and 44 in a rear region of the housing 12.
  • a first rear support wheel 48 is disposed below the on / off switch 22, and the second rear support wheel 49 is disposed below the rechargeable battery 51.
  • the battery 51 is equipped with lithium-ion cells, which are characterized not only by a very long life and by a relatively low weight but also by the fact that they have virtually no self-discharge and are little sensitive to cold.
  • the rechargeable battery 51 can be charged within a very short time. It can be provided that the battery 51 is removed from the housing 12 and connected to a separate charging station. However, it can also be provided that the sweeper 10 has its own charging electronics, so that the battery 51 can be recharged within the housing 12, provided that the sweeping device 10 is connected to a power supply network.
  • a stem 52 is pivotably held on the housing 12, with the aid of which the sweeping device 10 can be moved by the user along a surface 40 to be cleaned.
  • the sweeping roller 20 protrudes with its the first front support wheel 41 facing away from end face 53 transversely to the main movement direction 45 via the second front support wheel 44.
  • the end face 53 is arranged on an outer wall 54 of the housing 12.
  • an edge area of a surface to be cleaned can also be detected by the sweeping roller 20.
  • the sweeping device 10 can be moved directly along a wall defining a floor surface, wherein the sweeping roller 20 is arranged at a very small distance from the wall.
  • the sweeping roller 20 extends directly to the front side 18 of the housing 12.
  • the sweeper 10 thus has a very good Randfitkeit.
  • the diameter of the first front support wheel 41 this is in particular from FIG. 4
  • the diameter of the first front support wheel 41 may be about 10 cm
  • the diameter of the second front support wheel is preferably about 4 to 6 cm.
  • the diameter of the two rear support wheels 48, 49 is chosen smaller than the diameter of the second front support wheel 44.
  • the rear support wheels each have a diameter of about 4 cm.
  • the relatively large diameter of the first front support wheel 41 ensures that the sweeping device 10 can be reliably moved even over uneven surfaces, i. Uneven floors can be overcome without difficulty. At the same time it is ensured by the arrangement of the first front support wheel 41 in alignment with the sweeping roller 20, that the sweeping roller 20 has a constant distance to the surface to be cleaned 40, even in the presence of uneven floors. The risk that the sweeping roller 20 is blocked by bumps is thus very low.
  • the rear support wheels 48, 49 configured as steering wheels, which are not only freely rotatably mounted about a rotation axis 56 and 57 but also about a vertical pivot axis 59, 60 are pivoted can.
  • the rear support wheels 48, 49 are each mounted on a pivotable about the respective vertical pivot axis 59 and 60 pivot carrier 62 and 63, respectively.
  • a surface 40 can be reliably cleaned.
  • the direction of rotation of the sweeping roller 20 is selected such that the bristles 38 contacting the surface 40 are moved parallel to the main movement direction 45. This is in FIG. 2 symbolized by the arrow 65, which represents the direction of rotation of the sweeping roller 20.
  • the debris is thus thrown over the sweeping roller 20 in the subsequent hopper 14. It has been found that a particularly good cleaning result can be achieved by such a direction of rotation of the sweeping roller 20.
  • the sweeping device 10 is particularly suitable for cleaning surfaces outside of buildings.
  • the sweeper 10 is not limited to this purpose, of course, building interior surfaces can be cleaned by the sweeping device 10. Both outside of buildings and within buildings can be achieved by the sweeping device 10 a very good cleaning result.

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  • Cleaning In General (AREA)
  • Electric Suction Cleaners (AREA)
  • Electric Vacuum Cleaner (AREA)

Description

Die Erfindung betrifft ein fahrbares Kehrgerät mit einem Gehäuse, in dem eine elektromotorisch angetriebene Kehrwalze drehbar gelagert ist, und mit einem Kehrgutbehälter zur Aufnahme von Kehrgut, wobei am Gehäuse der Kehrwalze benachbart zwei vordere Stützräder und im Abstand zu diesen zumindest ein hinteres Stützrad jeweils um eine Drehachse drehbar gelagert sind.The invention relates to a mobile sweeper with a housing in which an electric motor driven sweeping roller is rotatably mounted, and with a hopper for receiving debris, wherein on the housing of the sweeping roller adjacent two front support wheels and at a distance to these at least one rear support wheel in each case Rotary axis are rotatably mounted.

Derartige Kehrgeräte sind beispielsweise aus der EP 1 199 971 B1 bekannt. Sie können entlang einer zu reinigenden Fläche verfahren werden, wobei mittels der Kehrwalze Kehrgut von der zu reinigenden Fläche aufgenommen und in den Kehrgutbehälter überführt werden kann.Such sweepers are for example from the EP 1 199 971 B1 known. They can be moved along a surface to be cleaned, wherein by means of the sweeping brush debris can be picked up by the surface to be cleaned and transferred to the hopper.

Zum Reinigen von Gebäudeinnenflächen haben sich solche Kehrgeräte bewährt, auf ebenen Flächen kann in der Regel ein gutes Reinigungsergebnis erzielt werden. Flächen außerhalb von Gebäuden können allerdings häufig nur unzureichend mittels derartiger Kehrgeräte gereinigt werden. Dies hat seine Ursache in den oft auftretenden Unebenheiten. Diese erschweren nicht nur ein Verfahren der Kehrgeräte, sondern es besteht die Gefahr, dass die Kehrwalze von Unebenheiten blockiert wird oder das Kehrgerät unbeabsichtigt um eine quer zur Hauptbewegungsrichtung ausgerichtete Achse kippt.For cleaning of building interior surfaces such sweeping devices have been proven on flat surfaces can usually be achieved a good cleaning result. However, surfaces outside of buildings can often be insufficiently cleaned by means of such sweeping equipment. This is due to the often occurring bumps. These not only complicate a process of sweeping equipment, but there is a risk that the sweeping roller is blocked by bumps or the sweeper unintentionally tilts around an axis aligned transversely to the main direction of movement axis.

Aufgabe der vorliegenden Erfindung ist es, ein Kehrgerät der eingangs genannten Art derart weiterzubilden, dass auch bei Auftreten von Flächenunebenheiten keine Gefahr besteht, dass die Kehrwalze blockiert wird oder das Kehrgerät kippt.Object of the present invention is to develop a sweeping device of the type mentioned in such a way that even when surface irregularities occur no danger that the sweeping roller is blocked or the sweeper tips.

Diese Aufgabe wird bei einem fahrbaren Kehrgerät der gattungsgemäßen Art erfindungsgemäß dadurch gelöst, dass die Drehachse eines ersten vorderen Stützrades koaxial zur Drehachse der Kehrwalze und - bezogen auf die Hauptbewegungsrichtung des Kehrgerätes - versetzt zur Drehachse des zweiten vorderen Stützrades angeordnet ist.This object is achieved in a mobile sweeper of the generic type according to the invention that the axis of rotation of a first front support wheel coaxial with the axis of rotation of the sweeping roller and - relative to the main movement direction of the sweeping device - offset from the axis of rotation of the second front support wheel.

Beim erfindungsgemäßen Kehrgerät sind die Drehachsen der beiden vorderen Stützräder bezogen auf die Hauptbewegungsrichtung des Kehrgerätes versetzt zueinander angeordnet. Und zwar ist die Drehachse eines ersten vorderen Stützrades koaxial zur Drehachse der Kehrwalze ausgerichtet, und die Drehachse des zweiten vorderen Stützrades ist versetzt dazu positioniert. Dies gibt die Möglichkeit, zumindest für das erste vordere Stützrad einen verhältnismäßig großen Durchmesser zu wählen, der das Verfahren des Kehrgerätes auf unebenen Flächen erleichtet, ohne dass hierzu vor der Kehrwalze ein großer Montageraum für das Stützrad bereit gestellt werden muss. Ein derartiger Montageraum hätte den Nachteil, dass in Hauptbewegungsrichtung des Kehrgerätes vorne angeordnete Randbereiche einer zu reinigenden Fläche von der Kehrwalze nicht erfasst werden könnten. Die Anordnung der Drehachse des ersten vorderen Stützrades koaxial zur Drehachse der Kehrwalze hat darüber hinaus den Vorteil, dass keine Gefahr besteht, dass die Kehrwalze vom unebenen Untergrund blockiert wird, denn das fluchtend zur Kehrwalze angeordnete erste vordere Stützrad bildet eine Art Abstandshalter für die Kehrwalze, indem es einen eindeutigen Abstand zwischen der Drehachse der Kehrwalze und der zu reinigenden Fläche definiert. Es besteht somit praktisch keine Gefahr, dass sich die Kehrwalze der zu reinigenden Fläche im Falle von Unebenheiten zu sehr nähert und dann die Borsten der Kehrwalze mit dem Untergrund verhaken. Auch eine Erhöhung des Kehrwiderstandes der Kehrwalze aufgrund von Bodenunebenheiten kann vermieden werden. Ein erhöhter Kehrwiderstand hätte eine gesteigerte Stromaufnahme eines die Kehrwalze antreibenden Elektromotors und damit eine Erwärmung und Belastung des Motors zur Folge Durch die Anordnung des ersten vorderen Stützrades fluchtend zur Kehrwalze kann der Kehrwiderstand der Kehrwalze auch auf unebenem Untergrund gering gehalten werden.When sweeping device according to the invention, the axes of rotation of the two front support wheels are offset relative to each other with respect to the main direction of movement of the sweeping device. Namely, the rotation axis of a first front support wheel is aligned coaxially with the rotation axis of the sweeping roller, and the rotation axis of the second front support wheel is positioned offset thereto. This makes it possible to choose a relatively large diameter, at least for the first front jockey wheel, which simplifies the operation of the sweeper on uneven surfaces, without having to provide a large mounting space for the jockey wheel in front of the sweeping roller. Such a mounting space would have the disadvantage that in the main direction of movement of the sweeping device front edge regions of a surface to be cleaned from the sweeping roller could not be detected. The arrangement of the axis of rotation of the first front support wheel coaxial with the axis of rotation of the sweeping roller has the additional advantage that there is no risk that the sweeping roller is blocked by uneven ground, because the arranged flush with the sweeping roller first front support wheel forms a kind of spacer for the sweeping roller, by defining a unique distance between the axis of rotation of the sweeping roller and the surface to be cleaned. There is thus virtually no danger that the sweeping roller of the surface to be cleaned in the case of unevenness approaches too much and then catch the bristles of the sweeping roller with the ground. Also, an increase of the reciprocating resistance of the sweeping roller due to Uneven floors can be avoided. An increased sweeping resistance would have increased power consumption of a sweeping roller driving electric motor and thus heating and loading of the engine result By the arrangement of the first front support wheel in alignment with the sweeping roller of the sweeping resistance of the sweeping roller can be kept low even on uneven ground.

Die versetzte Anordnung der Drehachsen der beiden Stützräder ermöglicht es, für das zweite vordere Stützrad eine Lage vor oder hinter der Kehrwalze zu wählen, so dass einem Verkippen des Kehrgerätes entgegengewirkt werden kann. Die Anordnung des zweiten vorderen Stützrades versetzt zur Kehrwalze hat darüber hinaus den Vorteil, dass sich die dem ersten vorderen Stützrad abgewandte Stirnseite der Kehrwalze bis an den Außenrand des Gehäuses oder sogar darüber hinaus erstrecken kann. Somit können auch seitliche Randbereiche einer zu reinigenden Fläche zuverlässig von der Kehrwalze erfasst werden. Das erfindungsgemäße Kehrgerät zeichnet sich somit durch eine sehr gute Randgängigkeit aus. Beispielsweise können mittels der Kehrwalze auch Bodenbereiche, die einer Wand unmittelbar benachbart sind, auf einfache Weise gereinigt werden. Die erfindungsgemäße Kehrwalze ermöglicht folglich ein randnahes Kehren.The staggered arrangement of the axes of rotation of the two support wheels makes it possible to select a position in front of or behind the sweeping roller for the second front support wheel, so that tilting of the sweeping device can be counteracted. The arrangement of the second front support wheel offset from the sweeping roller also has the advantage that the first front support wheel facing away from the end face of the sweeping roller can extend to the outer edge of the housing or even beyond. Thus, lateral edge regions of a surface to be cleaned can be reliably detected by the sweeping roller. The sweeping device according to the invention is thus characterized by a very good Randgängigkeit. For example, floor areas which are immediately adjacent to a wall can be cleaned in a simple manner by means of the sweeping roller. The sweeping roller according to the invention thus allows a near-sweeping sweeping.

Vorzugsweise ist die Drehachse des zweiten vorderen Stützrades bezogen auf die Hauptbewegungsrichtung des Kehrgerätes hinter der Kehrwalze angeordnet. Dies gibt die Möglichkeit, die Kehrwalze am vorderen Ende des Gehäuses zu lagern.Preferably, the axis of rotation of the second front support wheel is arranged with respect to the main direction of movement of the sweeping device behind the sweeping roller. This gives the possibility to store the sweeping roller at the front end of the housing.

Bevorzugt ist das zweite vordere Stützrad unmittelbar hinter der Kehrwalze angeordnet. Dies erhöht die Stabilität des Kehrgerätes beim Verfahren entlang einer unebenen Fläche.Preferably, the second front support wheel is arranged immediately behind the sweeping roller. This increases the stability of the sweeper when moving along an uneven surface.

Günstigerweise ist der Durchmesser des ersten vorderen Stützrades größer als der Durchmesser des zweiten vorderen Stützrades. Ein möglichst großer Durchmesser für das erste vordere Stützrad verbessert die Fahreigenschaften des Kehrgerätes. Für das versetzt zum ersten vorderen Stützrad angeordnete zweite vordere Stützrad kann demgegenüber ein kleinerer Durchmesser gewählt werden. Dies verringert den erforderlichen Montageraum für das zweite vordere Stützrad, ohne dass die Fahreigenschaften des Kehrgerätes merklich beeinträchtigt werden.Conveniently, the diameter of the first front support wheel is greater than the diameter of the second front support wheel. The largest possible diameter for the first front jockey wheel improves the driving characteristics of the sweeper. In contrast, a smaller diameter can be selected for the second front support wheel arranged offset to the first front support wheel. This reduces the required mounting space for the second front jockey wheel, without the driving characteristics of the sweeper are significantly affected.

Es kann vorgesehen sein, dass der Durchmesser des ersten vorderen Stützrades mindestens 8 cm beträgt, vorzugsweise circa 10 cm.It can be provided that the diameter of the first front support wheel is at least 8 cm, preferably about 10 cm.

Der Durchmesser des zweiten vorderen Stützrades beträgt bei einer bevorzugten Ausführungsform der Erfindung weniger als etwa 7 cm.The diameter of the second front support wheel is less than about 7 cm in a preferred embodiment of the invention.

Bei einer vorteilhaften Ausführungsform beträgt der Durchmesser des ersten vorderen Stützrades mindestens das 1,3-fache des Durchmessers des zweiten vorderen Stützrades.In an advantageous embodiment, the diameter of the first front support wheel is at least 1.3 times the diameter of the second front support wheel.

Bevorzugt ist die dem ersten vorderen Stützrad abgewandte Stirnseite der Kehrwalze quer zur Hauptbewegungsrichtung des Kehrgerätes auf gleicher Höhe wie das zweite vordere Stützrad angeordnet. Besonders vorteilhaft ist es, wenn die dem ersten vorderen Stützrad abgewandte Stirnseite der Kehrwalze über das zweite vordere Stützrad hervorsteht. Quer zur Hauptbewegungsrichtung des Kehrgerätes ist somit das zweite vordere Stützrad bei einer bevorzugten Ausführungsform der Erfindung in Richtung der Mittelachse des Kehrgerätes nach innen versetzt. Dies ermöglicht ein besonders randnahes Kehren, da sich die Borsten der Kehrwalze seitlich bis an den Rand einer zu reinigenden Bodenfläche erstrecken können, ohne vom zweiten vorderen Stützrad behindert zu werden.The end face of the sweeping roller facing away from the first front support wheel is preferably arranged transversely to the main direction of movement of the sweeping device at the same height as the second front support wheel. It is particularly advantageous if the end face of the sweeping roller facing away from the first front support wheel is particularly advantageous protrudes beyond the second front support wheel. Transverse to the main direction of movement of the sweeping device thus the second front support wheel is offset in a preferred embodiment of the invention in the direction of the central axis of the sweeping device inwards. This allows a sweeping close to the edges, since the bristles of the sweeping roller can extend laterally to the edge of a floor surface to be cleaned, without being hindered by the second front support wheel.

Wie bereits erläutert, weist das erfindungsgemäße Kehrgerät zusätzlich zu den beiden vorderen Stützrädern mindestens ein hinteres Stützrad auf, das um eine Drehachse frei drehbar gelagert ist. Hierbei ist es günstig, wenn das mindestens eine hintere Stützrad an einem um eine vertikale Schwenkachse schwenkbaren Schwenkträger drehbar gelagert ist. Das mindestens eine hintere Stützrad bildet somit ein Lenkrad aus, das das Verfahren des Kehrgerätes entlang einer Fläche, insbesondere einer unebenen Flache, vereinfacht.As already explained, the sweeping device according to the invention has, in addition to the two front support wheels, at least one rear support wheel, which is freely rotatably mounted about an axis of rotation. It is advantageous if the at least one rear support wheel is rotatably mounted on a pivotable about a vertical pivot axis pivot carrier. The at least one rear support wheel thus forms a steering wheel, which simplifies the process of the sweeping device along a surface, in particular an uneven surface.

Günstig ist es, wenn das Kehrgerät zwei hintere Stützräder aufweist. Dies vermeidet die Gefahr, dass das Kehrgerät beim Verfahren entlang einer Fläche um seine Längsachse kippt.It is favorable if the sweeping device has two rear support wheels. This avoids the risk that the sweeping device tilts along a surface about its longitudinal axis during the process.

Bei Einsatz von zwei hinteren Stützrädern hat es sich als besonders günstig erwiesen, wenn das zweite vordere Stützrad quer zur Hauptbewegungsrichtung des Kehrgerätes zwischen einem hinteren Stützrad und der dem ersten vorderen Stützrad abgewandten Stirnseite der Kehrwalze angeordnet ist.When using two rear support wheels, it has proved to be particularly advantageous if the second front support wheel is arranged transversely to the main direction of movement of the sweeping device between a rear support wheel and the end face of the sweeping roller facing away from the first front support wheel.

Bei einer vorteilhaften Ausführungsform weist das mindestens eine hintere Stützrad einen kleineren Durchmesser auf als ein vorderes Stützrad. Insbesondere kann vorgesehen sein, dass der Durchmesser des mindestens einen hinteren Stützrades kleiner ist als der Durchmesser des zweiten vorderen Stützrades.In an advantageous embodiment, the at least one rear support wheel has a smaller diameter than a front support wheel. Especially it can be provided that the diameter of the at least one rear support wheel is smaller than the diameter of the second front support wheel.

Die Kehrwalze wird beim erfindungsgemäßen Kehrgerät von einem Elektromotor angetrieben. Die Energieversorgung des Elektromotors kann über ein Versorgungskabel erfolgen, das an ein Spannungsversorgungsnetz oder einen Generator anschließbar ist. Von besonderem Vorteil ist es jedoch, wenn das fahrbare Kehrgerät zumindest eine wieder aufladbare Batterie aufweist. Für den Betrieb des Kehrgerätes ist es dann nicht erforderlich, dass ein Spannungsversorgungsnetz oder ein Generator zugänglich ist. Der Einsatz einer wieder aufladbaren Batterie, die mit Lithium-Ionen-Zellen bestückt ist, hat hierbei den besonderen Vorteil, dass die Batterie praktisch keine Selbstentladung aufweist. Selbst wenn also das Kehrgerät längere Zeit unbenutzt bleibt, ist es nicht in jedem Falle erforderlich, zunächst die Batterie aufzuladen. Lithium-Ionen-Zellen haben außerdem den Vorteil, dass sie wenig kälteempfindlich sind und dass sie ein verhältnismäßig geringes Gewicht aufweisen. Außerdem können sie innerhalb kurzer Zeit aufgeladen werden. Aufgrund der fluchtenden Anordnung des ersten vorderen Stützrades zur Kehrwalze kann dessen Kehrwiderstand, wie bereits beschrieben, gering gehalten werden, selbst auf unebenem Untergrund. Somit ist für den Elektromotor keine große Stromaufnahme erforderlich. Dies wiederum verlängert die Lebensdauer der Batterie.The sweeping roller is driven in sweeping device according to the invention by an electric motor. The power supply of the electric motor can be done via a supply cable that can be connected to a power supply network or a generator. However, it is particularly advantageous if the mobile sweeper has at least one rechargeable battery. For the operation of the sweeping device, it is then not necessary that a power supply network or a generator is accessible. The use of a rechargeable battery, which is equipped with lithium-ion cells, this has the particular advantage that the battery has virtually no self-discharge. So even if the sweeper remains unused for a long time, it is not always necessary to charge the battery first. Lithium-ion cells also have the advantage that they are less sensitive to cold and that they have a relatively low weight. Moreover, they can be charged within a short time. Due to the aligned arrangement of the first front support wheel for sweeping roller whose sweeping resistance, as already described, be kept low, even on uneven ground. Thus, no large power consumption is required for the electric motor. This in turn prolongs the life of the battery.

Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine perspektivische Darstellung eines fahrbaren Kehrgerätes;
Figur 2:
eine Seitenansicht des Kehrgerätes aus Figur 1;
Figur 3:
eine Schnittansicht längs der Linie 3-3 in Figur 2 und
Figur 4:
eine Unteransicht des Kehrgerätes aus Figur 1.
The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a perspective view of a mobile sweeping device;
FIG. 2:
a side view of the sweeping device FIG. 1 ;
FIG. 3:
a sectional view taken along the line 3-3 in FIG. 2 and
FIG. 4:
a bottom view of the sweeping device FIG. 1 ,

In der Zeichnung ist schematisch eine bevorzugte Ausführungsform eines erfindungsgemäßen fahrbaren Kehrgerätes 10 dargestellt mit einem Gehäuse 12, das einen Kehrgutbehälter 14 umgibt. Der Kehrgutbehälter 14 ist nach Art einer Schublade ausgestaltet und kann an der Rückseite 16 des Gehäuses aus dem Gehäuse herausgezogen, entleert und anschließend wieder in das Gehäuse 12 hineingeschoben werden.In the drawing, a preferred embodiment of a mobile sweeping device 10 according to the invention is shown schematically with a housing 12 surrounding a hopper 14. The hopper 14 is designed in the manner of a drawer and can be pulled out of the housing at the back 16 of the housing, emptied and then pushed back into the housing 12.

Der Vorderseite 18 des Gehäuses 12 unmittelbar benachbart ist innerhalb des Gehäuses eine Kehrwalze 20 um eine Drehachse 21 drehbar gelagert. Die Kehrwalze 20 wird von einem an sich bekannten und deshalb zur Erzielung einer besseren Übersicht in der Zeichnung nicht dargestellten Elektromotor in Drehung versetzt. Der Elektromotor ist innerhalb des Gehäuses 12 in einem mittleren Bereich vor einem Ein-/Aus-Schalter 22 angeordnet. Über einen Riementrieb 24 steht der Elektromotor mit der Kehrwalze in Drehverbindung. Der Riementrieb 24 umfasst wie üblich eine Riemenscheibe 26, die an einer drehbar gelagerten Antriebswelle 28 drehfest gehalten ist und um die ein Antriebsriemen 30 herumgeführt ist, der über ein zweistufiges Riemengetriebe und eine drehfest mit der Motorwelle gekoppelte Riemenscheibe (in der Zeichnung nicht dargestellt) angetrieben wird. Die Antriebswelle 28 taucht über einen Mitnehmer 32 in eine seitliche Ausnehmung 34 eines Walzenkerns 36 der Kehrwalze 20 ein. Über den Mitnehmer 32 ist die Antriebswelle 28 drehfest mit dem Walzenkern 36 verbunden, so dass dieser von der Antriebswelle 28 in Drehung versetzt werden kann. Vom Walzenkern 36 stehen in radialer Richtung eine Vielzahl von Borsten 38 nach außen ab, mit deren Hilfe eine Fläche 40 gereinigt werden kann.Immediately adjacent to the front side 18 of the housing 12, a sweeping roller 20 is rotatably mounted about a rotation axis 21 within the housing. The sweeping roller 20 is rotated by a known per se and therefore not shown in the drawing to achieve a better overview in the drawing. The electric motor is disposed within the housing 12 in a central region in front of an on / off switch 22. Via a belt drive 24, the electric motor is in rotary connection with the sweeping roller. The belt drive 24 comprises, as usual, a pulley 26, which is rotatably held on a rotatably mounted drive shaft 28 and around which a drive belt 30 is guided, which via a two-stage belt transmission and a non-rotatably coupled to the motor shaft pulley (not shown in the drawing) driven becomes. The drive shaft 28 dives over a Driver 32 in a lateral recess 34 of a roller core 36 of the sweeping roller 20 a. About the driver 32, the drive shaft 28 is rotatably connected to the roller core 36 so that it can be rotated by the drive shaft 28 in rotation. From the roller core 36 are in the radial direction a plurality of bristles 38 from the outside, with the aid of a surface 40 can be cleaned.

Zum Verfahren des Kehrgerätes 10 entlang der Fläche 40 weist dieses insgesamt vier Stützräder auf. Ein erstes vorderes Stützrad 41 ist mit seiner Drehachse 42 koaxial zur Drehachse 21 der Kehrwalze 20 ausgerichtet. Das erste vordere Stützrad 41 wirkt somit als Abstandshalter für die Kehrwalze 20 und verhindert einen großen Kehrwiderstand oder gar ein Blockieren der Kehrwalze auf unebenem Untergrund. Dadurch wird die Stromaufnahme des Elektromotors gering gehalten und dies wiederum erhöht die Lebensdauer der wieder aufladbaren Batterie 51, die den Elektromotor mit Energie versorgt.To move the sweeper 10 along the surface 40, this has a total of four support wheels. A first front support wheel 41 is aligned with its axis of rotation 42 coaxial with the axis of rotation 21 of the sweeping roller 20. The first front support wheel 41 thus acts as a spacer for the sweeping roller 20 and prevents a large sweeping resistance or even blocking the sweeping roller on uneven ground. As a result, the power consumption of the electric motor is kept low and this in turn increases the life of the rechargeable battery 51, which supplies the electric motor with energy.

Ein zweites vorderes Stützrad 44 ist bezogen auf die Hauptbewegungsrichtung 45 des Kehrgerätes 10 nach hinten versetzt zur Drehachse 21 der Kehrwalze 20 und damit auch versetzt zur Drehachse 42 des ersten vorderen Stützrades 41 angeordnet. Die Drehachse des zweiten vorderen Stützrades 44 ist in der Zeichnung mit dem Bezugszeichen 46 belegt. Zwei hintere Stützräder 48, 49 sind im Abstand zu den vorderen Stützrädern 41 und 44 in einem rückwärtigen Bereich des Gehäuses 12 positioniert. Ein erstes hinteres Stützrad 48 ist unterhalb des Ein-/Aus-Schalters 22 angeordnet, und das zweite hintere Stützrad 49 ist unterhalb der wieder aufladbaren Batterie 51 angeordnet. Die Batterie 51 ist mit Lithium-Ionen-Zellen bestückt, die sich nicht nur durch eine sehr hohe Lebensdauer und durch ein verhältnismäßig geringes Gewicht auszeichnen sondern auch dadurch, dass sie praktisch keine Selbstentladung aufweisen und wenig kälteempfindlich sind. Die wieder aufladbare Batterie 51 kann innerhalb sehr kurzer Zeit aufgeladen werden. Hierbei kann vorgesehen sein, dass die Batterie 51 dem Gehäuse 12 entnommen und an eine separate Ladestation angeschlossen wird. Es kann allerdings auch vorgesehen sein, dass das Kehrgerät 10 über eine eigene Ladeelektronik verfügt, so dass die Batterie 51 innerhalb des Gehäuses 12 wieder aufgeladen werden kann, sofern das Kehrgerät 10 an ein Spannungsversorgungsnetz angeschlossen wird.A second front support wheel 44 is relative to the main movement direction 45 of the sweeping device 10 to the rear offset from the axis of rotation 21 of the sweeping roller 20 and thus also offset from the axis of rotation 42 of the first front support wheel 41. The axis of rotation of the second front support wheel 44 is occupied by the reference numeral 46 in the drawing. Two rear support wheels 48, 49 are positioned at a distance to the front support wheels 41 and 44 in a rear region of the housing 12. A first rear support wheel 48 is disposed below the on / off switch 22, and the second rear support wheel 49 is disposed below the rechargeable battery 51. The battery 51 is equipped with lithium-ion cells, which are characterized not only by a very long life and by a relatively low weight but also by the fact that they have virtually no self-discharge and are little sensitive to cold. The rechargeable battery 51 can be charged within a very short time. It can be provided that the battery 51 is removed from the housing 12 and connected to a separate charging station. However, it can also be provided that the sweeper 10 has its own charging electronics, so that the battery 51 can be recharged within the housing 12, provided that the sweeping device 10 is connected to a power supply network.

Oberseitig ist an das Gehäuse 12 ein Stiel 52 verschwenkbar gehalten, mit dessen Hilfe das Kehrgerät 10 vom Benutzer entlang einer zu reinigenden Fläche 40 verfahren werden kann.On the upper side, a stem 52 is pivotably held on the housing 12, with the aid of which the sweeping device 10 can be moved by the user along a surface 40 to be cleaned.

Wie aus Figur 4 deutlich wird, steht die Kehrwalze 20 mit ihrer dem ersten vorderen Stützrad 41 abgewandten Stirnseite 53 quer zur Hauptbewegungsrichtung 45 über das zweite vordere Stützrad 44 hervor. Die Stirnseite 53 ist an einer Außenwand 54 des Gehäuses 12 angeordnet. Dadurch kann von der Kehrwalze 20 auch ein Randbereich einer zu reinigenden Fläche erfasst werden. Beispielsweise kann das Kehrgerät 10 unmittelbar entlang einer eine Bodenfläche begrenzenden Gebäudewand verfahren werden, wobei die Kehrwalze 20 in einem sehr geringen Abstand zur Wand angeordnet ist. Aus Figur 4 wird deutlich, dass sich die Kehrwalze 20 bis unmittelbar an die Vorderseite 18 des Gehäuses 12 erstreckt. Damit kann auch in Hauptbewegungsrichtung 45 eine Fläche bis in sehr kurzem Abstand zu einer Stirnwand gereinigt werden. Das Kehrgerät 10 weist somit eine sehr gute Randgängigkeit auf.How out FIG. 4 becomes clear, the sweeping roller 20 protrudes with its the first front support wheel 41 facing away from end face 53 transversely to the main movement direction 45 via the second front support wheel 44. The end face 53 is arranged on an outer wall 54 of the housing 12. As a result, an edge area of a surface to be cleaned can also be detected by the sweeping roller 20. For example, the sweeping device 10 can be moved directly along a wall defining a floor surface, wherein the sweeping roller 20 is arranged at a very small distance from the wall. Out FIG. 4 It is clear that the sweeping roller 20 extends directly to the front side 18 of the housing 12. Thus, even in the main direction of movement 45, a surface can be cleaned up to a very short distance from an end wall. The sweeper 10 thus has a very good Randgängigkeit.

Der Durchmesser des ersten vorderen Stützrades 41, dies wird insbesondere aus Figur 4 deutlich, ist größer gewählt als der Durchmesser des zweiten vorderen Stützrades 44. Zum Beispiel kann der Durchmesser des ersten vorderen Stützrades 41 etwa 10 cm betragen, wohingegen der Durchmesser des zweiten vorderen Stützrades vorzugsweise circa 4 bis 6 cm beträgt. Der Durchmesser der beiden hinteren Stützräder 48, 49 ist kleiner gewählt als der Durchmesser des zweiten vorderen Stützrades 44. Beispielsweise können die hinteren Stützräder jeweils einen Durchmesser von circa 4 cm aufweisen.The diameter of the first front support wheel 41, this is in particular from FIG. 4 For example, the diameter of the first front support wheel 41 may be about 10 cm, whereas the diameter of the second front support wheel is preferably about 4 to 6 cm. The diameter of the two rear support wheels 48, 49 is chosen smaller than the diameter of the second front support wheel 44. For example, the rear support wheels each have a diameter of about 4 cm.

Der verhältnismäßig große Durchmesser des ersten vorderen Stützrades 41 stellt sicher, dass das Kehrgerät 10 auch über unebene Flächen zuverlässig verfahren werden kann, d.h. Bodenunebenheiten können ohne Schwierigkeiten überwunden werden. Gleichzeitig wird durch die Anordnung des ersten vorderen Stützrades 41 fluchtend zur Kehrwalze 20 sichergestellt, dass die Kehrwalze 20 einen gleich bleibenden Abstand zu der zu reinigenden Fläche 40 aufweist, selbst bei Auftreten von Bodenunebenheiten. Die Gefahr, dass die Kehrwalze 20 von Unebenheiten blockiert wird, ist somit sehr gering.The relatively large diameter of the first front support wheel 41 ensures that the sweeping device 10 can be reliably moved even over uneven surfaces, i. Uneven floors can be overcome without difficulty. At the same time it is ensured by the arrangement of the first front support wheel 41 in alignment with the sweeping roller 20, that the sweeping roller 20 has a constant distance to the surface to be cleaned 40, even in the presence of uneven floors. The risk that the sweeping roller 20 is blocked by bumps is thus very low.

Um das Verfahren des Kehrgerätes 10 entlang der Fläche 40 zu vereinfachen, sind die hinteren Stützräder 48, 49 als Lenkräder ausgestaltet, die nicht nur jeweils um eine Drehachse 56 bzw. 57 frei drehbar gelagert sind sondern auch um eine vertikale Schwenkachse 59, 60 verschwenkt werden können. Hierzu sind die hinteren Stützräder 48, 49 jeweils an einem um die jeweilige vertikale Schwenkachse 59 bzw. 60 schwenkbaren Schwenkträger 62 bzw. 63 gelagert.In order to simplify the process of the sweeping device 10 along the surface 40, the rear support wheels 48, 49 configured as steering wheels, which are not only freely rotatably mounted about a rotation axis 56 and 57 but also about a vertical pivot axis 59, 60 are pivoted can. For this purpose, the rear support wheels 48, 49 are each mounted on a pivotable about the respective vertical pivot axis 59 and 60 pivot carrier 62 and 63, respectively.

Mittels des Kehrgerätes 10 kann eine Fläche 40 zuverlässig gereinigt werden. Hierbei wird Kehrgut von der Kehrwalze nach dem sogenannten Überwurfprinzip von der Fläche 40 aufgenommen und in den Kehrgutbehälter 14 überführt wird. Die Drehrichtung der Kehrwalze 20 ist derart gewählt, dass die die Fläche 40 kontaktierenden Borsten 38 parallel zur Hauptbewegungsrichtung 45 bewegt werden. Dies ist in Figur 2 durch den Pfeil 65 symbolisiert, der die Drehrichtung der Kehrwalze 20 darstellt. Das Kehrgut wird somit über die Kehrwalze 20 in den sich daran anschließenden Kehrgutbehälter 14 geworfen. Es hat sich gezeigt, dass durch eine derartige Drehrichtung der Kehrwalze 20 ein besonders gutes Reinigungsergebnis erzielt werden kann.By means of the sweeping device 10, a surface 40 can be reliably cleaned. This sweeping material from the sweeping roller according to the so-called Überwurfprinzip taken from the surface 40 and transferred to the hopper 14. The direction of rotation of the sweeping roller 20 is selected such that the bristles 38 contacting the surface 40 are moved parallel to the main movement direction 45. This is in FIG. 2 symbolized by the arrow 65, which represents the direction of rotation of the sweeping roller 20. The debris is thus thrown over the sweeping roller 20 in the subsequent hopper 14. It has been found that a particularly good cleaning result can be achieved by such a direction of rotation of the sweeping roller 20.

Aufgrund seiner guten Verfahrbarkeit auch auf unebenen Flächen eignet sich das Kehrgerät 10 insbesondere zur Reinigung von Flächen außerhalb von Gebäuden. Das Kehrgerät 10 ist allerdings nicht auf diesen Einsatzzweck beschränkt, selbstverständlich können auch Gebäudeinnenflächen vom Kehrgerät 10 gereinigt werden. Sowohl außerhalb von Gebäuden als auch innerhalb von Gebäuden kann mittels des Kehrgerätes 10 ein sehr gutes Reinigungsergebnis erzielt werden.Due to its good mobility even on uneven surfaces, the sweeping device 10 is particularly suitable for cleaning surfaces outside of buildings. However, the sweeper 10 is not limited to this purpose, of course, building interior surfaces can be cleaned by the sweeping device 10. Both outside of buildings and within buildings can be achieved by the sweeping device 10 a very good cleaning result.

Claims (12)

  1. Mobile sweeper (10) comprising a housing (12), in which a sweeping roller (20) driven by an electric motor is mounted for rotation, and a sweepings container (14) for receiving sweepings, there being mounted on the housing (12) adjacent to the sweeping roller (20) two front supporting wheels (41, 44) and at a distance from these at least one rear supporting wheel (48, 49), each for rotation about an axis of rotation (42, 46, 56, 57), characterized in that the axis of rotation (42) of a first front supporting wheel (41) is arranged coaxially with the axis of rotation (21) of the sweeping roller (20) and, in relation to the main direction of movement (45) of the sweeper (10), offset from the axis of rotation (46) of the second front supporting wheel (44).
  2. Sweeper in accordance with claim 1, characterized in that the axis of rotation (46) of the second front supporting wheel (44) is arranged, in relation to the main direction of movement (45) of the sweeper (10), behind the sweeping roller (20).
  3. Sweeper in accordance with claim 2, characterized in that the second front supporting wheel (44) is arranged immediately behind the sweeping roller (20).
  4. Sweeper in accordance with claim 1, 2 or 3, characterized in that the diameter of the first front supporting wheel (41) is larger than the diameter of the second front supporting wheel (44).
  5. Sweeper in accordance with any one of claims 1 to 4, characterized in that the diameter of the first front supporting wheel (41) is at least 8 cm.
  6. Sweeper in accordance with any one of claims 1 to 5, characterized in that the diameter of the first front supporting wheel (41) is at least 1.3 times the diameter of the second front supporting wheel (44).
  7. Sweeper in accordance with any one of the preceding claims, characterized in that the end face (53), oriented away from the first front supporting wheel (41), of the sweeping roller (20) is arranged, transversely to the main direction of movement (45) of the sweeper (10), level with the second front supporting wheel (44) or projects beyond the second front supporting wheel (44).
  8. Sweeper in accordance with any one of the preceding claims, characterized in that the at least one rear supporting wheel (48, 49) is mounted for rotation on a pivot support (62, 63) which is pivotable about a vertical pivot axis (59, 60).
  9. Sweeper in accordance with any one of the preceding claims, characterized in that the sweeper (10) comprises two rear supporting wheels (48, 49).
  10. Sweeper in accordance with any one of the preceding claims, characterized in that the at least one rear supporting wheel (48, 49) has a smaller diameter than a front supporting wheel (41, 44).
  11. Sweeper in accordance with any one of the preceding claims, characterized in that the sweeper (10) comprises at least one rechargeable battery (51).
  12. Sweeper in accordance with claim 11, characterized in that the rechargeable battery (51) is equipped with lithium-ion cells.
EP09745481A 2008-05-14 2009-03-13 Wheeled sweeping unit Not-in-force EP2278907B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008024439A DE102008024439A1 (en) 2008-05-14 2008-05-14 Mobile sweeper
PCT/EP2009/001839 WO2009138147A1 (en) 2008-05-14 2009-03-13 Wheeled sweeping unit

Publications (2)

Publication Number Publication Date
EP2278907A1 EP2278907A1 (en) 2011-02-02
EP2278907B1 true EP2278907B1 (en) 2012-09-05

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ID=40639953

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EP09745481A Not-in-force EP2278907B1 (en) 2008-05-14 2009-03-13 Wheeled sweeping unit

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US (1) US8621700B2 (en)
EP (1) EP2278907B1 (en)
CN (1) CN102026573B (en)
DE (1) DE102008024439A1 (en)
WO (1) WO2009138147A1 (en)

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Publication number Publication date
CN102026573B (en) 2015-06-17
WO2009138147A1 (en) 2009-11-19
CN102026573A (en) 2011-04-20
US20110126367A1 (en) 2011-06-02
EP2278907A1 (en) 2011-02-02
US8621700B2 (en) 2014-01-07
WO2009138147A8 (en) 2010-01-14
DE102008024439A1 (en) 2009-11-19

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