HANDHELD FLOOR CLEANING DEVICE

Abstract

The invention relates to a hand-held floor cleaning device (10) comprising a cleaning head (16) which has a drive motor (52) and a first cleaning roller unit (66) with at least one first cleaning roller (70, 72) which is rotatable about a first axis of rotation (76), and further comprising a handle (34) which is held on the cleaning head (16) and at the end of which, facing away from the cleaning head (16), an operating unit (38) with a handle (40) is arranged.In order to further develop the floor cleaning device (10) such that it has a high cleaning performance and a compact design, it is proposed that the cleaning head (16) has a second cleaning roller unit (68) with at least one second cleaning roller (80, 82) which is rotatable about a second axis of rotation (86), wherein the drive motor (52) has a motor shaft (54) which is rotatable about a motor axis (56), wherein the first axis of rotation (76), the second axis of rotation (86) and the motor shaft (54) are aligned parallel to one another and the drive motor (52) is arranged between the two cleaning roller units (66, 68) with respect to a feed direction (14) of the floor cleaning device (10) and projects into a free space (94) between the two cleaning roller units (66, 68), which space faces away from a floor surface (12) to be cleaned.

Description

[0001] The invention relates to a hand-held floor cleaning device comprising a cleaning head which has a drive motor with a motor shaft rotatable about a motor axis, and which has a first cleaning roller unit with at least one first cleaning roller which is held in a rotationally fixed manner on a first drive shaft, wherein the first drive shaft is rotatable about a first axis of rotation and is coupled to the motor shaft via first gear elements, and further comprising a handle which is held on the cleaning head and at the end of which, facing away from the cleaning head, an operating unit is arranged with a handle which can be grasped by the user.

[0002] Using such floor cleaning devices, a floor surface can be cleaned, wherein the user can hold the floor cleaning device with one hand and guide it along the floor surface to be cleaned. The floor cleaning device has a cleaning head which has a drive motor and at least one first cleaning roller unit. The drive motor has a motor shaft which is rotatable about a motor axis. The first cleaning roller unit has at least one first cleaning roller which is held in a rotationally fixed manner on a first drive shaft. The first drive shaft is rotatable about a first rotation axis and is coupled to the motor shaft of the drive motor via first gear elements. A handle is held on the cleaning head, which handle has an operating unit with a handle which can be grasped by the user at its end facing away from the cleaning head.

[0003] Floor cleaning devices of the type in question are particularly suitable for use outdoors, for example, for cleaning wooden terraces and tiled floor surfaces. For this purpose, the at least one first cleaning roller unit is preferably designed as a brush roller unit and has at least one first brush roller with a bristle system formed by a plurality of cleaning bristles.

[0004] Hand-held floor cleaning devices of the type mentioned above are known, for example, from DE 10 2021 128 035 A1.

[0005] The object of the present invention is to further develop a hand-held floor cleaning device of the type mentioned above in such a way that it has a high cleaning performance and a compact design.

[0006] This object is achieved according to the invention in a hand-held floor cleaning device of the generic type in that the cleaning head has a second cleaning roller unit with at least one second cleaning roller which is held in a rotationally fixed manner on a second drive shaft, wherein the second drive shaft is rotatable about a second axis of rotation and is coupled to the drive motor via second gear elements, wherein the first axis of rotation, the second axis of rotation and the motor axis are aligned parallel to one another, and wherein the drive motor is arranged between the two cleaning roller units with respect to a feed direction of the floor cleaning device and projects into a free space between the two cleaning roller units which, during use of the floor cleaning device, faces away from a floor surface to be cleaned.

[0007] The floor cleaning device according to the invention comprises a cleaning head with a drive motor that rotates both a first drive shaft and a second drive shaft. At least one first cleaning roller of a first cleaning roller unit is non-rotatably mounted on the first drive shaft, and at least one second cleaning roller of a second cleaning roller unit is non-rotatably mounted on the second drive shaft. The drive motor is coupled to the first drive shaft via first gear elements, and the drive motor is coupled to the second drive shaft via second gear elements. High cleaning performance can be achieved by means of the two cleaning roller units.

[0008] With respect to the feed direction of the floor cleaning device, the drive motor is positioned between the two cleaning rollers, extending into a space between the two cleaning rollers that faces away from the floor surface to be cleaned during use. This allows for a very compact design of the floor cleaning device, with both the drive motor and the two cleaning roller units integrated into the cleaning head.

[0009] The floor cleaning device according to the invention is particularly suitable for outdoor applications. It is advantageous if both the at least one first cleaning roller of the first cleaning roller unit and the at least one second cleaning roller of the second cleaning roller unit are designed as bristle rollers, which have a bristle arrangement with a plurality of cleaning bristles.

[0010] It is advantageous if the two axes of rotation and the motor axis are arranged at the vertices of an imaginary isosceles triangle, the first leg of which extends from the motor axis to the first axis of rotation, the second leg of which extends from the motor axis to the second axis of rotation, and the base of which extends from the first axis of rotation to the second axis of rotation. The two legs are of equal length, meaning the distance between the motor axis and the first axis of rotation is the same as the distance between the motor axis and the second axis of rotation. This facilitates the manufacture and assembly of the floor cleaning device.

[0011] In an advantageous embodiment of the invention, a particularly compact design is achieved in that the length of the legs of the imaginary isosceles triangle is smaller than the length of the base of the imaginary isosceles triangle.

[0012] The length of the legs of the imaginary isosceles triangle is preferably 0.7 to 0.9 times the length of the base of the imaginary isosceles triangle.

[0013] The two cleaning roller units preferably have the same diameter.

[0014] The two cleaning roller units can be designed identically. This simplifies the assembly of the floor cleaning device and reduces its manufacturing costs.

[0015] The distance between the first rotational axis and the second rotational axis is preferably less than 1.5 times the diameter of the first cleaning roller unit and the second cleaning roller unit. This enables a particularly compact design of the floor cleaning device and facilitates its handling.

[0016] It is advantageous if the vertical distance between the motor axis and the connecting line between the two rotational axes of the cleaning roller unit is 0.6 to 0.7 times the distance between the two rotational axes.

[0017] It is particularly advantageous, in particular with regard to the handling of the floor cleaning device according to the invention, if the first cleaning roller unit has two first cleaning rollers which are aligned in alignment with one another and are connected in a rotationally fixed manner to the first drive shaft and are rotatable about the first axis of rotation, wherein at least one first gear element between the two first cleaning rollers is connected in a rotationally fixed manner to the first drive shaft, and if the second cleaning roller unit has two second cleaning rollers which are aligned in alignment with one another and are connected in a rotationally fixed manner to the second drive shaft and are rotatable about the second axis of rotation, wherein at least one second gear element between the two cleaning rollers is connected in a rotationally fixed manner to the second drive shaft.In such an embodiment of the invention, the two cleaning roller units are each designed in two parts and each comprise two cleaning rollers, each of which is rotationally fixedly connected to a drive shaft. The first drive shaft is driven by the drive motor via first gear elements, with at least one of the first gear elements being rotationally fixedly connected to the first drive shaft in the area between the two first cleaning rollers. The second drive shaft is driven by the drive motor via second gear elements, with at least one of the second gear elements being rotationally fixedly connected to the second drive shaft between the two second cleaning rollers.

[0018] Advantageously, the at least one first cleaning roller is releasably mounted on the first drive shaft, and the at least one second cleaning shaft is releasably mounted on the second drive shaft. This facilitates handling of the floor cleaning device, particularly when replacing a cleaning roller.

[0019] In a particularly preferred embodiment of the invention, the cleaning head has a geometric center plane arranged centrally between a first longitudinal side and a second longitudinal side of the cleaning head opposite said first longitudinal side, wherein the first cleaning rollers of the first cleaning roller unit and the second cleaning rollers of the second cleaning roller unit are each arranged mirror-symmetrically to the geometric center plane. This further simplifies the handling of the floor cleaning device and also facilitates its assembly.

[0020] It is particularly advantageous if the drive motor is arranged on one side of the geometric center plane. The geometric center plane is aligned perpendicular to the floor surface to be cleaned and divides the cleaning head into two halves, each positioned on a side of the geometric center plane. One of the two halves of the cleaning head accommodates the drive motor, which, in such an embodiment of the invention, is arranged between a first cleaning roller of the first cleaning roller unit and a second cleaning roller of the second cleaning roller unit with respect to a feed direction of the floor cleaning device and projects into a free space between said first cleaning roller and said second cleaning roller, which space faces away from the floor surface to be cleaned during use of the floor cleaning device.

[0021] It is advantageous if the rotational directions of the two cleaning roller units are opposite to each other. In such an embodiment of the invention, the two cleaning roller units are driven in opposite directions. This has the advantage that the frictional forces caused by the two cleaning roller units, which come into effect when guiding the floor cleaning device along the floor surface to be cleaned, can practically compensate for each other, so that the user only needs to exert minimal force when handling the floor cleaning device.

[0022] Preferably, the rotation directions of the two cleaning roller units are directed opposite each other in the circumferential areas where the cleaning roller units act on the floor surface to be cleaned. Dirt particles that are detached from the floor surface to be cleaned as the floor cleaning device is moved along are transferred to the area between the two cleaning rollers with this rotation direction of the cleaning roller units, so that any discomfort to the user caused by detached dirt particles can be minimized.

[0023] In an advantageous embodiment of the invention, at least one spray nozzle is arranged on one end of the cleaning head, which is connected via a fluid line to a connecting element arranged on the control unit. This allows a water hose to be connected to the connecting element, so that water can be supplied to the floor cleaning device from a water supply network or a pump, which can be applied to the floor surface to be cleaned via the fluid line and the spray nozzles. This enables a further increase in cleaning performance.

[0024] Particularly simple handling is achieved in an advantageous embodiment of the floor cleaning device according to the invention in that the handle is pivotably mounted on the cleaning head via a joint about a pivot axis, wherein the pivot axis is aligned parallel to the first axis of rotation, the second axis of rotation, and the motor axis. In such an embodiment of the invention, the handle is pivotally connected to the cleaning head and can be aligned by the user in such a way that they can guide the floor cleaning device along the floor surface to be cleaned in a desired orientation.

[0025] It is advantageous if the handle can be locked in a parking position on the cleaning head. This facilitates handling of the floor cleaning device during transport and storage. For example, with the handle in the parking position, the floor cleaning device can be placed on a base with one end of the cleaning head leaning against a wall or hung using a hanging device, thus relieving the load on the cleaning roller units. The floor cleaning device requires minimal storage space.

[0026] It is advantageous if the handle extends in the longitudinal direction of the cleaning head in the parking position.

[0027] A further simplification of the handling of the floor cleaning device is achieved in an advantageous embodiment of the invention in that the pivot axis of the handle is arranged in relation to a feed direction of the floor cleaning device in the area between a rear wall of the cleaning head and the axis of rotation of the cleaning roller unit at the front in the feed direction and, with respect to a height direction of the floor cleaning device, perpendicular to the surface to be cleaned above the cleaning roller units.

[0028] It has been found that by positioning the pivot axis in this way, a particularly uniform movement of the floor cleaning device along the surface to be cleaned can be achieved, whereby vibrations of the floor cleaning device perpendicular to the floor surface can be kept to a very low level.

[0029] It is particularly advantageous if the pivot axis is positioned above the rear cleaning roller unit in the feed direction of the floor cleaning device. This allows for a thrust force to be applied in an ergonomically favorable manner to the area between the two cleaning roller units.

[0030] The following description of an advantageous embodiment of the invention serves to explain it in more detail in conjunction with the drawings. They show: Fig. 1: a perspective view of a hand-held floor cleaning device with a cleaning head to which a handle is hinged, the handle assuming a working position; Fig. 2: a perspective view of the floor cleaning device from Fig. 1, wherein the handle assumes a parking position; Fig. 3: a front view of the floor cleaning device from Fig. 1; Fig. 4: an enlarged perspective view of the cleaning head from Fig. 1, wherein a ceiling wall of the cleaning head is hidden; Fig. 5: a sectional view of the cleaning head along the line 5-5 in Fig. 3; Fig. 6: a sectional view of the cleaning head along the line 6-6 in Fig. 3, wherein the handle assumes a parking position; Fig. 7: a sectional view of the cleaning head along the line 7-7 in Fig. 5.

[0031] The drawing schematically illustrates, by way of example, an advantageous embodiment of a hand-held floor cleaning device according to the invention, which is designated overall by the reference numeral 10. The floor cleaning device 10 can be manually guided by the user along a floor surface 12 to be cleaned in order to clean the floor surface. The floor cleaning device 10 can be moved back and forth in a feed direction 14 and counter to the feed direction 14.

[0032] The floor cleaning device 10 is particularly suitable for outdoor applications, for example for cleaning wooden terraces and stone tiles.

[0033] The floor cleaning device 10 has a cleaning head 16 with a housing 18, which has a front side 20, a rear side 22 opposite the front side 20, a first longitudinal side 24 and a second longitudinal side 26 opposite the first longitudinal side 24, and a top side 28. The top side 28 is defined by a top wall 60 of the housing 18, which in Fig. 4 is hidden.

[0034] A geometric center plane 30 of the cleaning head 16 extends centrally between the first longitudinal side 24 and the second longitudinal side 26 from the front side 20 to the rear side 22. The geometric center plane 30 is in Fig. 3 shown schematically with a dashed line.

[0035] A stem 34 is pivotally mounted on the housing 18 by means of a joint 32 about a pivot axis 36. Starting from a parking position, which is Fig. 2 and in which the handle 34 is aligned in the longitudinal direction of the cleaning head 16, the handle 34 can be pivoted into different working positions in which the handle 34 is aligned obliquely or, if necessary, almost perpendicularly to the longitudinal direction of the cleaning head 16 and thus obliquely or almost perpendicularly to the floor surface 12. In Fig. 1, the floor cleaning device 10 is shown in such a working position.

[0036] An operating unit 38 is arranged at the end of the handle 34 facing away from the cleaning head 16. The operating unit 38 has a handle 40 in the manner of a pistol, which the user can grip with one hand. A connecting element 42 is arranged on the operating unit 38 and is connected to two spray nozzles 44, 46 arranged on the front 20 of the housing 18 via a liquid line (not shown in the drawing). The liquid line is guided through the handle 34. Alternatively, it can also be guided along the handle 34. A water hose (not shown in the drawing for clarity) can be connected to the connecting element 42. Water can be supplied to the floor cleaning device 10 via the water hose from a water supply network or from a pump, which water can be applied to the floor surface 12 to be cleaned via the spray nozzles 44, 46.

[0037] In addition to the handle 40, the operating unit 42 has a mains plug 48 which can be connected to a mains cable to supply power to the floor cleaning device 10 and is connected to the cleaning head 16 via an electrical cable 50 which is largely guided through the handle 34 or alternatively guided along the handle 34.

[0038] The housing 18 of the cleaning head 16 accommodates an electric drive motor 52, which is positioned on one side of the geometric center plane 30 and has a motor shaft 54 ​​rotatable about a motor axis 56. The drive motor 52 is electrically connected to the power plug 48 via the electrical cable 50 to supply the drive motor 52 with electrical power. To switch the drive motor 52 on and off, an electrical switch with a switching lever 58 is arranged on the handle 40 of the control unit 38 and can be operated by the user.

[0039] As already mentioned, the housing 18 has a top wall 60. A permanent magnet 62 is mounted on the inside of the top wall 60, which cooperates with a magnetizable holding plate 64 attached to the handle 34 to lock the handle 34 in its parking position.

[0040] The housing 18 covers a first cleaning roller unit 66 and a second cleaning roller unit 68, which in the illustrated embodiment are each designed as brush roller units.

[0041] The first cleaning roller unit 66 has two first cleaning rollers 70, 72 arranged in alignment with one another, which are connected in a rotationally fixed manner to a first drive shaft 74. The first drive shaft 74 is rotatably mounted about a first rotation axis 76 and coupled to the motor shaft 54 ​​of the drive motor 52 via first gear elements 78, wherein one of the first gear elements 78 is connected in a rotationally fixed manner to the drive shaft 74 in the region between the two first cleaning rollers 70, 72.

[0042] The second cleaning roller unit 68 has two second cleaning rollers 80, 82 aligned in alignment with one another, which are rotationally fixedly mounted on a second drive shaft 84. The second drive shaft 84 is rotatably mounted about a second rotation axis 86 and coupled to the motor shaft 54 ​​of the drive motor 52 via second gear elements 88, wherein one of the second gear elements 88 is rotationally fixedly connected to the second drive shaft 84 between the two second cleaning rollers 80, 82.

[0043] In their entirety, the first and second gear elements 78, 88 form a spur gear 89 which is arranged essentially in the geometric center plane 30 of the cleaning head 16.

[0044] By means of the drive motor 52, the two cleaning roller units 66, 68 can be set in rotation, wherein the directions of rotation of the two cleaning roller units 66, 68 are opposite to each other. Specifically, the directions of rotation of the two cleaning roller units 66, 68 are opposite to each other in the circumferential areas in which the first cleaning rollers 70, 72 and the second cleaning rollers 80, 82 act on the floor surface 12 to be cleaned. This is shown in Fig. 5 by the arrows 90, 92. Dirt particles detached from the floor surface 12 during cleaning are fed to the area between the two cleaning roller units 66, 68, and the reaction forces generated by the cleaning roller units 66, 68 are largely compensated, so that the floor cleaning device 10 can be guided along the floor surface 12 to be cleaned by the user with little effort.

[0045] The drive motor 52 is arranged between the first cleaning roller unit 66 and the second cleaning roller unit 68 with respect to the feed direction 14 and projects into a free space 94 between the two cleaning roller units 66, 68, which, during use of the floor cleaning device 10, faces away from the floor surface 12 to be cleaned. This is particularly evident from Fig. 5 clearly.

[0046] The two rotation axes 76, 86 of the cleaning roller units 66 and 68 and the motor axis 56 are aligned parallel to each other and form the corner points of an imaginary isosceles triangle 96, which in Fig. 5 is shown in dash-dotted lines. A first leg 98 of the imaginary triangle 96 extends from the motor axis 56 to the first axis of rotation 76, a second leg 100 of the imaginary triangle 96 extends from the motor axis 56 to the second axis of rotation 86, and a base side 102 of the imaginary triangle 96 extends from the first axis of rotation 76 to the second axis of rotation 86. The two legs 98, 100 have the same length, i.e., the distance between the motor axis 56 and the first axis of rotation 76 is as large as the distance between the motor shaft 56 and the second axis of rotation 86.

[0047] The length of the legs 98, 100 is smaller than the length of the base 102 of the imaginary isosceles triangle 96. In the illustrated embodiment, the length of the legs 96, 100 is 0.7 times to 0.9 times the length of the base 102. For example, the length of the legs 98, 100 can be 0.8 times the length of the base 102.

[0048] The provision of the two cleaning roller units 66 and 68 gives the floor cleaning device 10 a high cleaning performance. Despite the use of the two cleaning roller units, the floor cleaning device 10 has a very compact design, since the drive motor 52 extends into the free space 94 between the two cleaning roller units 66 and 68, with this free space 94 facing away from the floor surface 12 to be cleaned.

[0049] As is particularly evident from Fig.5, the joint 32, by means of which the handle 34 is held on the cleaning head 16 so as to be pivotable about the pivot axis 36, is arranged above the second cleaning roller unit 68, which is positioned behind the first cleaning roller unit 66 with respect to the feed direction 14. This allows the user to exert a pushing force on the cleaning head 16 via the operating unit 38 and the handle 34, under the effect of which pushing force the floor cleaning device 10 can be guided evenly along the floor surface 12 to be cleaned, wherein the cleaning head 16 only executes slight movements perpendicular to the floor surface 12, even on rough floor surfaces 12.

[0050] Alternatively, the joint 32 could also be positioned offset from the first cleaning roller unit 66 with respect to the feed direction 14, although with respect to the feed direction 14 it should assume a position in the area between the rear side 22 of the housing 18 and the rotational axis 76 of the first cleaning roller unit 66 and with respect to a height direction of the floor cleaning device 10 perpendicular to the floor surface 12 to be cleaned above the cleaning roller units 66, 68 in order to ensure the most uniform possible movement of the cleaning head 16 even on rough floor surfaces. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2021 128 035 A1

[0004]

Claims

[1] Hand-held floor cleaning device comprising a cleaning head (16) which has a drive motor (52) with a motor shaft (54) rotatable about a motor axis (56), and which has a first cleaning roller unit (66) with at least one first cleaning roller (70, 72) which is held in a rotationally fixed manner on a first drive shaft (74), wherein the first drive shaft (74) is rotatable about a first axis of rotation (76) and is coupled to the motor shaft (54) via first gear elements (78), and further comprising a handle (34) which is held on the cleaning head (16) and at the end of which, facing away from the cleaning head (16), an operating unit (38) is arranged with a handle (40) which can be grasped by the user, characterized byin that the cleaning head (16) has a second cleaning roller unit (68) with at least one second cleaning roller (80, 82) which is held in a rotationally fixed manner on a second drive shaft (84), wherein the second drive shaft (84) is rotatable about a second axis of rotation (86) and is coupled to the drive motor (52) via second gear elements (88), wherein the first axis of rotation (76), the second axis of rotation (86) and the motor axis (56) are aligned parallel to one another, and wherein the drive motor (52) is arranged between the two cleaning roller units (66, 68) with respect to a feed direction (14) of the floor cleaning device (10) and projects into a free space (94) between the two cleaning roller units (66, 68), which space faces away from a floor surface (12) to be cleaned during use of the floor cleaning device (10). [2] Floor cleaning device according to claim 1, characterized bythat the two axes of rotation (76, 86) and the motor axis (56) are arranged at the corner points of an imaginary isosceles triangle (96), the first leg (98) of which extends from the motor axis (56) to the first axis of rotation (76) and the second leg (100) of which extends from the motor axis (56) to the second axis of rotation (86) and the base side (102) of which extends from the first axis of rotation (76) to the second axis of rotation (86). [3] Floor cleaning device according to claim 2, characterized by that the length of the legs (98, 100) of the imaginary isosceles triangle (96) is smaller than the length of the base (102) of the imaginary isosceles triangle (96). [4] Floor cleaning device according to claim 3, characterized by that the length of the legs (98, 100) of the imaginary isosceles triangle (96) is 0.7 times to 0.9 times the length of the base side (102) of the imaginary isosceles triangle (96). [5] Floor cleaning device according to one of the preceding claims, characterized by in that the first cleaning roller unit (66) has two first cleaning rollers (70, 72) which are aligned in alignment with one another and are connected in a rotationally fixed manner to the first drive shaft (74) and are rotatable about the first axis of rotation (76), wherein at least one first gear element between the two first cleaning rollers (70, 72) is connected in a rotationally fixed manner to the first drive shaft (74), and in that the second cleaning roller unit (68) has two second cleaning rollers (80, 82) which are aligned in alignment with one another and are connected in a rotationally fixed manner to the second drive shaft (84) and are rotatable about the second axis of rotation (86), wherein at least one second gear element between the two second cleaning rollers (80, 82) is connected in a rotationally fixed manner to the second drive shaft (74). [6] Floor cleaning device according to claim 5, characterized bythat the cleaning head (16) has a geometric center plane (30) which is arranged centrally between a first longitudinal side (24) and a second longitudinal side (26) of the cleaning head (16) opposite thereto, and that the first cleaning rollers (70, 72) of the first cleaning roller unit (66) and the second cleaning rollers (80, 82) of the second cleaning roller unit (68) are each arranged mirror-symmetrically to the geometric center plane (30). [7] Floor cleaning device according to claim 6, characterized by that the drive motor (72) is arranged on one side of the geometric center plane (30). [8] Floor cleaning device according to one of the preceding claims, characterized by that the directions of rotation (90, 92) of the two cleaning roller units (66, 68) are opposite to each other. [9] Floor cleaning device according to claim 8, characterized bythat the directions of rotation (90, 92) of the two cleaning roller units (66, 68) are directed against each other in the circumferential areas in which the cleaning roller units (66, 68) act on the floor surface (12) to be cleaned. [10] Floor cleaning device according to one of the preceding claims, characterized by that the handle (34) is held on the cleaning head (16) via a joint (32) so as to be pivotable about a pivot axis (36), the pivot axis (36) being aligned parallel to the first axis of rotation (76) and to the second axis of rotation (86) and to the motor axis (56). [11] Floor cleaning device according to claim 10, characterized by that the handle (34) can be locked in a parking position on the cleaning head (16). [12] Floor cleaning device according to claim 10 or 11, characterized bythat the pivot axis (36) is arranged, with respect to a feed direction (14) of the floor cleaning device (10), in the region between a rear side (22) of the cleaning head (16) and the rotation axis (76) of the front cleaning roller unit (66) in the feed direction (14) and, with respect to a height direction of the floor cleaning device (10), perpendicular to the floor surface (12) to be cleaned above the cleaning roller units (66, 68). [13] Floor cleaning device according to claim 12, characterized by that the pivot axis (36) is arranged above the rear cleaning roller unit (68) in the feed direction (14) of the floor cleaning device (10).

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