Mobile floor-cleaning device

Abstract

The invention relates to a mobile floor-cleaning device (100), comprising a chassis (112) for moving on a floor surface (104), the floor-cleaning device (100) being movable in a main direction of movement (118) in a cleaning mode; a cleaning unit (120) having at least one cleaning tool (126) for cleaning the floor surface (104); a storage container (136) for a cleaning liquid which can be applied to the floor surface (104); and a dirt-receiving unit (140) for receiving dirty cleaning liquid from the floor surface (104), the dirt-receiving unit being situated behind the cleaning unit (120) with respect to the main direction of movement (118). The floor-cleaning device (100) comprises a wiping unit (148) with a wiping element (152), which is situated at least partly in front of the cleaning unit (120) and behind at least one wheel (114) of the chassis (112) in relation to the main direction of movement (118) and which is in contact with the floor surface (104) at least when traveling opposite the main direction of movement (118).

Description

[0001] MOBILE FLOOR CLEANING DEVICE

[0002] The present invention relates to a mobile floor cleaning device comprising a chassis for movement on a floor surface, wherein the floor cleaning device is movable in a main direction of movement during cleaning operation, a cleaning device with at least one cleaning tool for cleaning the floor surface, a reservoir for cleaning fluid that can be applied to the floor surface, and a dirt collection device for collecting contaminated cleaning fluid, wherein the dirt collection device is arranged behind the cleaning device with respect to the main direction of movement.

[0003] A floor cleaning device of this type, designed for example as a scrubber-dryer, can be used to clean the floor surface. For example, cleaning fluid – in particular water, to which a cleaning chemical can be added to increase cleaning performance – is applied to the floor surface. The floor surface is moistened with the cleaning fluid via one or more nozzles arranged on the cleaning device, preferably in front of at least one cleaning tool in the main direction of movement. The dirt can be loosened with the cleaning tool, and the mixture of cleaning fluid and dirt, the dirty water, can be collected from the floor surface by the dirt collection device and transferred to the dirty water container.

[0004] For example, the dirt collection device includes a suction bar that can be subjected to negative pressure by means of a suction unit.

[0005] The main direction of movement runs, for example, along a longitudinal axis of the floor cleaning machine, which moves in this main direction when traveling straight ahead. During cleaning operations, the floor cleaning machine is typically moved forward, although turns are possible. Accordingly, at least one directional component of a forward movement can lie in the main direction of movement.

[0006] Generic, robotically designed floor cleaning devices are described, for example, in CN 219594475 U and in WO 2023 / 184036 A1. The object of the present invention is to further develop a generic floor cleaning device in such a way that an improved cleaning result can be achieved.

[0007] This problem is solved according to the invention in a floor cleaning device of the type mentioned at the outset by the fact that the floor cleaning device comprises a scraping device with a scraping body which is arranged at least sectionally, with respect to the main direction of movement, in front of the cleaning device and behind at least one wheel of the chassis and which is in contact with the floor surface at least when traveling against the main direction of movement.

[0008] The present invention incorporates the consideration that the floor cleaning device may need to be moved against its main direction of travel during cleaning operation. For example, a straight reverse movement or a reverse movement with a curve is conceivable. A reverse movement is necessary, for instance, when the floor cleaning device is maneuvered into a narrow space (in autonomous operation) or is being maneuvered (in user-guided operation), when a cleaning path of the floor cleaning device is blocked by an obstacle, or when the floor cleaning device or a user mistakenly enters a cleaning path and needs to reverse. Further examples that necessitate moving the floor cleaning device backward, and in particular against its main direction of travel, are conceivable. According to the present invention, a scraper device with a scraper body is provided.The scraper is designed to remain in contact with the floor surface when moving against the main direction of travel, thereby scraping the surface. This offers the following advantage: During forward cleaning, dirty liquid is present between the cleaning unit and the dirt collection device (e.g., a squeegee) located longitudinally behind it. When the floor cleaning machine is moved backward, this dirty liquid can no longer be collected by the dirt collection device. However, the scraper allows the dirty liquid to be scraped off and carried away. When cleaning resumes in the forward direction, and especially in the main direction of travel, the scraped-off amount of dirty liquid can be collected by the dirt collection device in the usual way.The arrangement of the scraper body in the main direction of movement behind a wheel of the chassis is advantageous. This prevents the wheel from driving through the dirty liquid. As a result, the floor cleaning device according to the invention achieves an improved cleaning result.

[0009] It follows from the preceding explanations that the floor cleaning device can be designed to be self-driving and self-steering in order to enable autonomous cleaning of the floor surface. The floor cleaning device can therefore be a cleaning robot.

[0010] Alternatively or additionally, the floor cleaning device may be user-operated. The floor cleaning device could, for example, be a ride-on device, a stand-on device, or a walk-behind device.

[0011] In a preferred embodiment, the floor cleaning device is, as mentioned at the outset, a scrubber-dryer.

[0012] It is advantageous if the scraper device includes an adjustment mechanism for lowering and raising the scraper body, whereby the scraper body is raised from the floor surface during forward movement of the floor cleaning machine, particularly in the main direction of travel, and is in contact with the floor surface during reverse movement of the floor cleaning machine, particularly against the main direction of travel. In "normal" cleaning operation, where the floor cleaning machine moves forward, the scraper body is raised from the floor surface. This prevents unnecessary wear. Furthermore, it prevents dirt from being scraped off the floor surface in an undesirable manner, thus ensuring that it can subsequently be picked up by the at least one cleaning tool.In contrast, when driving in reverse, especially against the main direction of travel, the scraper body is lowered and in contact with the ground surface in order to scrape off the dirty liquid.

[0013] It is understood that the conditions under which the scraper body is lowered by the adjusting mechanism are predetermined or can be predetermined. For example, it is lowered as soon as reverse gear is engaged and / or the chassis is activated for reverse travel. Alternatively, it may be stipulated, for instance, that a minimum distance must first be traveled in reverse before the scraper body is lowered to the ground. A similar principle can apply, for example, to raising the scraper body. It is raised, for instance, as soon as a forward gear is engaged or the chassis is activated for forward travel. Alternatively, a minimum distance must be traveled forward before the scraper body is raised.

[0014] In a preferred embodiment of the invention, the adjusting element can be designed to be variable in length, wherein the scraper body assumes the desired stroke position relative to the floor surface depending on the length of the adjusting element.

[0015] For example, the adjusting device includes or forms a spindle drive and / or a pneumatic or hydraulic cylinder drive.

[0016] Advantageously, the floor cleaning device includes a lifting drive for lowering and raising the cleaning unit, wherein the cleaning tool is engaged with the floor surface during cleaning operation when the floor cleaning device is moving forward, particularly in the main direction of movement. Such an embodiment is, for example, conventional, as it may be provided that the cleaning unit is raised from the floor surface during "idle" operation outside of cleaning operation. In contrast, during normal cleaning operation, the cleaning unit is lowered during forward movement, with the cleaning tool engaging with the floor surface.

[0017] Preferably, the cleaning device is lifted from the floor surface during a reverse movement, particularly against the main direction of travel and especially during cleaning operation. The dirty liquid can then be scraped off by the squeegee and collected by the dirt collection device during a subsequent forward movement. Cleaning with the at least one cleaning tool during a reverse movement can be omitted, for example, if the section of the floor surface covered during the reverse movement has already been cleaned.

[0018] It may be designed, for example, that the dirt collection device is at least partially lifted from the floor surface during the cleaning operation of the floor cleaning machine when moving backwards, particularly against the main direction of movement. This prevents unnecessary wear and tear on the dirt collection device. For example, a squeegee bar is raised. Preferably, the floor cleaning machine includes a lifting drive for lowering and raising the dirt collection device, especially a squeegee bar.

[0019] The adjustment mechanism and any lifting drives have already been discussed. Advantageously, the floor cleaning device includes a control unit that is coupled to the adjustment mechanism and / or to at least one lifting drive (for example, for the cleaning unit or the dirt collection unit) for controlling the adjustment mechanism and / or the lifting drive. Particularly in a robotic floor cleaning device, the adjustment mechanism and / or the lifting drive are controlled in a suitable manner so that the scraper body, the cleaning unit, and / or the dirt collection unit assume an advantageous position, or are raised or lowered.

[0020] It can be advantageous if the scraper mechanism is fixed to the cleaning unit. This allows for a more compact design.

[0021] For example, the scraper device is fixed on the front side of the cleaning device, relative to the main direction of movement.

[0022] Preferably, the scraper body can be raised and lowered relative to the cleaning device by means of an adjusting element of the scraper assembly. The adjusting element is preferably the one already mentioned and explained.

[0023] It may be provided that the stroke of the scraper body relative to the cleaning device is the same as, or different from, the stroke of the cleaning device relative to the floor cleaning machine. In one embodiment of the invention, the stroke of the scraper body relative to the cleaning device may be less than the stroke of the cleaning device relative to the floor cleaning machine.

[0024] It may be designed that, during reverse travel in cleaning mode, when the scraper body is lowered to the floor surface, the cleaning device assumes a raised position, but not to the extent of its (maximum) stroke. The cleaning device may, for example, be raised to an intermediate position between the lowered position and the (fully) raised position. In a structurally simple design, for example, the scraper body comprises a retaining element and an elastically deformable scraper lip held by the retaining element. The retaining element may, for example, be a strip or comprise a strip. For example, the retaining element may be made of a flat material, in particular a sheet of metal.

[0025] The scraper lip is preferably detachable from the retaining part so that it can be replaced if necessary. This need arises, for example, due to wear of the scraper lip and / or the desire to use different scraper lips of varying properties for different types of floor surfaces.

[0026] It is advantageous if the scraper extends laterally beyond the cleaning device on at least one side, and preferably both sides, in a direction transverse to the main direction of movement. This is beneficial so that as little dirt as possible, and ideally no dirt at all, remains on the floor surface when the floor cleaning device is moving backwards, and is instead captured by the scraper. For this purpose, it is further advantageous if the scraper is positioned as close as possible to the cleaning device and, for example, fixed to its front.

[0027] For example, the wiping device is fixed directly or indirectly to a housing of the cleaning device, which includes or forms, for example, a cleaning head.

[0028] Advantageously, the scraper body has a lateral scraper section extending rearward alongside the cleaning device on at least one side, and preferably on both sides, relative to a transverse direction of the floor cleaning device. This transverse direction is oriented transversely and, in particular, perpendicular to the main direction of movement. The lateral scraper section, extending rearward toward the rear of the floor cleaning section, allows for more reliable capture and removal of the dirty liquid.

[0029] The scraper body comprises, for example, a front section in front of the cleaning device and lateral scraper sections on opposite sides, which are connected to the front section via connecting sections. The scraper body has a curved shape at the connecting sections and / or at the lateral sections. At the front section, the scraper body is, for example, straight.

[0030] The scraper body is, for example, movably held on a support part by means of an adjusting element (in particular the adjusting element described above), wherein in particular the cleaning device includes the support part or the support part is fixed to the cleaning device, for example on a housing of the cleaning device.

[0031] For example, the scraper body may be pivotally mounted on the support structure via a joint arrangement comprising two or more pivoting links, using the adjusting mechanism. By pivoting the scraper body relative to the support structure, the scraper body can be raised or lowered when the adjusting mechanism is actuated.

[0032] The joint arrangement can, for example, comprise or form a parallelogram linkage. Joint elements of the parallelogram linkage include, for example, the support element, the aforementioned retaining element of the scraper body, and the two or more pivoting elements.

[0033] The joint arrangement may include a pivoting element to which the adjusting mechanism is coupled. The adjusting mechanism engages, for example, with a guide element of the pivoting element, and when the adjusting element is actuated, the pivoting element pivots relative to the support part and the wiper body. This allows for a simple design for raising and lowering the wiper body. For example, the adjusting element may be variable in length, so that its engagement with the pivoting element causes the pivoting element to pivot relative to both the support part and the holding part. The pivoting element may, for example, form a pivot lever, with the engagement of the adjusting element at a distance relative to the respective pivot axes on the support part and the holding part.

[0034] In a preferred embodiment of the invention, the guide element can, for example, be or comprise a cam guide. The scraper body is advantageously pivotable relative to the support part under the influence of at least one pretensioning element. For example, at least one pretensioning element is provided that acts between the support part and the holding part. It is advantageous if the scraper body can be lowered by means of the force of the pretensioning element.

[0035] For example, when the scraper body contacts the floor surface, it is spring-mounted by means of at least one preload element. For this purpose, the adjusting mechanism can, for instance, be passively switched. This allows unevenness in the floor surface to be compensated for.

[0036] The preload element is preferably a mechanical spring element, for example a coil spring acting in tension.

[0037] For example, two or more prestressing elements are provided which can be spaced apart from each other in the transverse direction of the floor cleaning device.

[0038] The following description of a preferred embodiment of the invention, in conjunction with the drawing, serves to explain the invention in more detail. The drawing shows:

[0039] Figure 1: a side view of the floor cleaning device according to the invention in a preferred embodiment;

[0040] Figure 2: an enlarged view of detail A in Figure 1 during cleaning operation in a forward motion;

[0041] Figure 3: the detail corresponding to Figure 2 during cleaning operation in reverse;

[0042] Figure 4: a perspective view of a cleaning device and a scraper device of the floor cleaning machine in an exploded view;

[0043] Figure 5: the cleaning device and the scraping device, wherein a scraping body of the scraping device assumes a raised position;

[0044] Figure 6: a representation corresponding to Figure 5 in a front view; Figure 7: a representation corresponding to Figure 5, wherein the scraper body assumes a lowered position; and

[0045] Figure 8: the representation corresponding to Figure 7 in a front view.

[0046] Figure 1 shows a side view of a floor cleaning device according to the invention, designated by reference numeral 100, in a preferred embodiment. The floor cleaning device 100 is configured as a scrubber-dryer 102 for cleaning a floor surface 104. In this example, the floor cleaning device 100 is designed to be self-steering and self-propelled, thus enabling autonomous cleaning of the floor surface. All work steps can be controlled by a control unit 106 of the floor cleaning device 100.

[0047] Additionally, the floor cleaning device 100 in this example can also be user-operated. A user (not shown in the drawing) can use an operating unit 108, which is coupled to the control unit 106, to issue operating instructions for the operation of the floor cleaning device 100 and for other necessary actions during operation. The floor cleaning device 100 is, by way of example, a ride-on device in which a seat 110 is provided for the user.

[0048] In a different preferred embodiment, the floor cleaning device 100 could be a stand-on device or a ride-on device.

[0049] For operation on the floor surface 104, the floor cleaning device 100 comprises a chassis 112 with wheels 114. At least one wheel 114 can be driven by a drive unit 116 so that the floor cleaning device 100 can move forwards and backwards. Straight-line travel corresponds to travel in a main direction of movement 118 of the floor cleaning device 100, and straight-line reverse travel corresponds to travel against the main direction of movement 118.

[0050] Curves can be negotiated both when moving forward and backward. For this purpose, at least one wheel 114 is steerable. In this case, one wheel 114 is steerable and is located at the front of the floor cleaning device 100 with respect to the main direction of movement 118. The wheels 114 located behind this wheel are driven by the drive unit 116.

[0051] A cleaning device 120 of the floor cleaning device 100 is arranged between the wheels 114, which are spaced apart from each other in the main direction of movement 118. In this case, the cleaning device 120 comprises a so-called cleaning head 122, which includes a housing 124.

[0052] The cleaning head 122 has at least one cleaning tool 126, which can be driven, for example, by a drive unit 128 (Figure 4) in a rotary and / or oscillating manner. In the present example, two cleaning tools 126 in the form of disc brushes 130 are provided. The disc brushes 130 are arranged laterally next to each other in a transverse direction 132, which is oriented transversely and, in particular, perpendicular to the main direction of movement 118. They may be offset along the main direction of movement 118 (Figure 6).

[0053] In a different design, it may be provided that at least one roller brush is used instead of disc brushes 130.

[0054] The cleaning device 120 is height-adjustable by means of a lifting drive 134 and can therefore be lowered and raised relative to the floor surface 104.

[0055] Outside of cleaning operation, for example during an empty run, the cleaning device 120 is raised, and the cleaning tools 126 are out of contact with the floor surface 104 (Figure 1).

[0056] During cleaning operation, the cleaning device 120 is lowered so that the cleaning tools 126 engage with the floor surface 104 to remove dirt (Figure 2). This is usually the case when the floor cleaning device 100 is moved forward and, in particular, in the main direction of movement 118.

[0057] To increase cleaning performance, the floor surface 104 can be moistened with a cleaning fluid, which is primarily water to which a cleaning chemical may be added. The cleaning fluid is stored in a reservoir 136 and is supplied to the cleaning device 120 via a supply line (not shown in the drawing). With respect to the longitudinal direction of the floor cleaning device 100, the floor surface 104 in front of the cleaning tools 126 is moistened with the cleaning fluid, which allows dirt to be removed more effectively from the cleaning tools 126.

[0058] The dirty fluid, comprising the cleaning fluid and loosened dirt, can be transferred to a dirty fluid container 138 of the floor cleaning device 100. For this purpose, the floor cleaning device 100 includes a dirt collection unit 140 and a suction unit 142. A lifting drive 146 is associated with a suction bar 144 of the dirt collection unit.

[0059] Both lifting drives 134, 146 can be controlled by the control unit 106.

[0060] Outside of cleaning operation, particularly during empty travel, the squeegee 144 is raised from the floor surface 104 (Figure 1). During cleaning operation, when moving forward (Figure 2), the squeegee 144 is lowered so that a wiper lip of the squeegee 144 contacts the floor surface 104.

[0061] The suction bar 144 is arranged behind the cleaning device 120 and behind the rearmost wheel 114, in the present example at the rear of the floor cleaning device 100, with respect to the main direction of movement 118.

[0062] The suction unit 142 creates a vacuum in the interior of the dirty liquid container 138, which in turn creates a vacuum in the suction bar 144. The dirty liquid is thereby drawn out via the suction bar 144 and transferred to the dirty liquid container 138 via a liquid line (not shown in the drawing).

[0063] During the cleaning operation of the floor cleaning device 100, for example during autonomous cleaning, it may be necessary to reverse the floor cleaning device 100, particularly against the main direction of movement 118. This is also conceivable during user-guided operation. Reasons for reversing could include, for example, a cleaning path blocked by an obstacle, a narrow passage that the floor cleaning device 100 cannot pass through, or an incorrectly chosen travel path. When a conventional floor cleaning device 100 reverses, a section of the floor surface 104 covered with dirty liquid exists between the cleaning unit 120 and the squeegee 144. The dirty liquid may remain on the floor surface 104 and / or it may be spread across the floor surface 104 by the cleaning tools 126.The front wheel 114 could drive through the dirty fluid and thus also worsen the cleaning result.

[0064] To improve the cleaning result, the floor cleaning device 100 includes a scraper device 148, the construction of which will first be discussed with reference in particular to Figures 4 to 8.

[0065] The wiping device 148 comprises a support part 150 and a wiping body 152, which includes a retaining part 154 and a wiping lip 156. Furthermore, the wiping device 148 comprises an adjusting element 158, which can be controlled by the control unit 106, as well as pivoting elements 160 and at least one preloading element 162, in this case two preloading elements 162.

[0066] The scraper device 148 is held on the cleaning device 120, in this case with respect to the main direction of movement 118 on a front side 164 of the cleaning device 120.

[0067] For this purpose, it is provided, for example, that the support element 150 is fixed to the cleaning head 122 (for example, its housing 124). A preferred method of fixing is, for example, screwing, although other types of fasteners are also conceivable.

[0068] Although the floor cleaning device 100 is equipped with the scraper device 148 at the factory, it may be intended that the scraper device 148 is used for retrofitting a conventional floor cleaning device 100.

[0069] In this example, the support element 150 is made of a flat material, for example, a bent sheet of metal. The support element 150 comprises a plate-shaped section 166, by which the wiper 148 is fixed to the cleaning head 122, and a retaining section 168 oriented at an angle to this. In this example, the retaining section 168 comprises three projecting segments 170 arranged side by side in the transverse direction 132. The wiper body 152 is arranged in front of the support element 150. In this example, the wiper body 152 is essentially strip-shaped. In the transverse direction 132, the wiper body 152 extends laterally beyond the cleaning device 120 (Figures 5 to 8).

[0070] The scraper body 152 comprises a frontal section 172, which is longitudinally elongated and straight, and two lateral sections 174. The lateral sections 174 are arranged laterally next to the cleaning device 120 with respect to the transverse direction 132. The lateral sections 174 are connected to the frontal section 172 via connecting sections 176. In the area of ​​the connecting sections 176 and the lateral sections 174, the scraper body 152 has an arcuate, curved shape.

[0071] The lateral sections 174 and the connecting sections 176 are each guided around corner areas 178 of the cleaning head 122 on its front 164.

[0072] The retaining part 154 is preferably made of a flat material, for example of a bent sheet metal, like the supporting part 150.

[0073] The wiper lip 156 is preferably made of an elastically deformable material, for example, a rubber material. The wiper lip 156 is connected to the retaining part 154, in this case by screw connection. Other connection methods are conceivable.

[0074] The wiper lip 156 can be replaced, for example, if it is worn.

[0075] Alternatively, different scraper lips 156 can be kept for different floor surfaces 104 and attached to the holding part 154 as needed.

[0076] The scraper 148 forms a joint assembly 180. The joint assembly 180 comprises a plurality of joint links. In this example, the joint links are formed by the support part 150 (via the retaining section 168), by the scraper body 152 (via the retaining part 154), and by the pivot links 160. Each pivot link 160 is articulated to one of the segments 170 of the retaining section 168 via a respective pivot axis 182 and to the retaining part 154 via a further respective pivot axis 184. For this purpose, the retaining part 154 comprises two transversely spaced, projecting segments 186. As can be seen particularly from Figures 7 and 8, the joint assembly 180 forms a parallelogram link 188 in this example.

[0077] In the transverse direction 132 between the already mentioned pivot members 160, a further pivot member 190 is arranged, which is articulated about a pivot axis 182 on a segment 170 and about a further pivot axis 184 on a segment 186.

[0078] The adjusting element 158 ​​is effective between the support element 150 and the pivoting element 190. In the present example, the adjusting element 158 ​​is designed to be variable in length and is, for example, configured as a spindle drive 192.

[0079] The adjusting element 158 ​​is fixed to the support part 150 at a first end 194. A retaining tab 196 is provided for this purpose. The adjusting element 158 ​​is coupled to the pivot member 190 at a second end 198. Here, the adjusting element 158 ​​engages with a guide element 200 on the pivot member 190, the guide element 200 comprising a cam guide 202 with an elongated hole in this example.

[0080] The adjusting element 158 ​​can be pivoted at the first end 194 relative to the support part 150.

[0081] The pivoting element 190 forms a pivoting lever 204, which is actuated by the adjusting element 158 ​​and thereby pivoted relative to the support part 150. In this process, the pivoting element 190 is also pivoted relative to the holding part 154.

[0082] The pivoting of the scraper body 152 relative to the support element 150 is further effected by a preload force of the preload elements 162, which in this case are designed as mechanical spring elements 206, namely in the form of tension-acting helical springs. The spring elements 206 act between the pivot members 160 and the retaining section 168 on its segments 170.

[0083] The scraper device 148 is designed such that the scraper body 152 can assume a position raised relative to the floor surface 104. The scraper lip 156 is spaced away from the floor surface 104 (Figures 1, 2, 5 and 6). The scraper body 152 is raised when the floor cleaning device is running without load (Figure 1) or during normal cleaning operation when moving forward, particularly in the main direction of movement 118 (Figure 2).

[0084] During the aforementioned reverse movement, particularly against the main direction of movement 118, the scraper body 152 advantageously assumes a lowered position in which the scraper lip 156 contacts the floor surface 104 (Figures 3, 7, and 8). This is advantageous because any dirt that has not yet been picked up by the squeegee 144, and which is located particularly between the cleaning device 120 and the squeegee 114, can be scraped off the floor surface 104. If the floor cleaning device 100 then resumes forward movement, this amount of dirt can be picked up by the squeegee 144.

[0085] It can be provided that during reverse travel, the suction bar 144 is raised from the floor surface 104 (Figure 3). For this purpose, the lifting drive 134 is controlled in a suitable manner. When forward travel continues, the suction bar 144 is lowered back onto the floor surface (Figure 2).

[0086] In the raised position of the scraper body 152, the adjusting element 158 ​​is extended in the present example (Figures 6 and 7). The spring elements 206 are tensioned.

[0087] To lower the device, the adjusting element 158 ​​is actuated and, in this case, shortened. This causes the second end 198 to move within the cam guide 202. As a result, the pivoting link 190 pivots relative to the support part 150 and simultaneously relative to the holding part 154. The spring elements 206 are released. At the same time, the holding part 154 pivots relative to the support part 150 via the pivot links 160 (Figures 7 and 8).

[0088] In the lowered position, the scraper body 152 is preferably spring-mounted via the spring elements 206 to compensate for unevenness in the floor surface 104. For this purpose, the adjusting device 158 can also be passively switched when the scraper body 152 is lowered.

[0089] By actuating the device again, the adjusting element 158 ​​is extended so that the scraper body 152 can be raised again from the floor surface 104. When reversing from the floor surface 104, the cleaning device 120 is preferably not raised completely to its maximum stroke, but rather assumes an intermediate position between the lowered position and the (fully) raised position. Reference numeral list

[0090] Floor cleaning machine scrubber-dryer

[0091] floor area

[0092] control unit

[0093] Control unit

[0094] seat

[0095] chassis

[0096] wheel

[0097] Drive unit, main direction of movement, cleaning device, cleaning head

[0098] Housing

[0099] Cleaning tool

[0100] drive unit

[0101] plate brush

[0102] transverse direction

[0103] Lifting drive

[0104] Storage container, dirty water container, dirt collection device, suction unit

[0105] Suction strip

[0106] Lifting drive

[0107] Scraper device

[0108] Support part

[0109] scraper body

[0110] Retaining part

[0111] wiper lip

[0112] Adjustment device

[0113] Swivel joint

[0114] Prestressing element, front, plate-shaped section, holding section, segment

[0115] frontal section, side section, connecting section, corner area, joint arrangement, pivot axis, pivot axis segment, joint parallelogram, pivot link, spindle drive

[0116] first end retaining tab

[0117] second end guide element cam guide swivel lever

[0118] spring element

Claims

PATENT CLAIMS 1. Mobile floor cleaning machine (100), comprising a chassis (112) for moving on a floor surface (104), wherein the floor cleaning device (100) is movable in a cleaning operation in a main direction of movement (118), a cleaning device (120) with at least one cleaning tool (126) for cleaning the floor surface (104), a reservoir (136) for cleaning fluid that can be applied to the floor surface (104), and a dirt collection device (140) for collecting contaminated cleaning fluid from the floor surface (104), wherein the dirt collection device (140) is arranged behind the cleaning device (120) with respect to the main direction of movement (118), characterized by the fact that The floor cleaning device (100) comprises a scraper device (148) with a scraper body (152) which is arranged at least sectionally in front of the cleaning device (120) and behind at least one wheel (114) of the chassis (112) with respect to the main direction of movement (118) and which is in contact with the floor surface (104) at least when traveling against the main direction of movement (118).

2. Mobile floor cleaning device (100) according to claim 1, characterized by the fact that The scraper device (148) comprises an adjusting element (158) for lowering and raising the scraper body (152), wherein the scraper body (152) is raised from the floor surface (104) during cleaning operation of the floor cleaning device (100) in forward travel, in particular in the main direction of movement (118), and wherein the scraper body (152) is in contact with the floor surface (104) during reverse travel of the floor cleaning device (100) in cleaning operation, in particular against the main direction of movement (118).

3. Mobile floor cleaning device (100) according to claim 2, characterized in that the adjusting element (158) is designed to be variable in length and / or that the adjusting element (158) includes or forms a spindle drive (192) and / or a pneumatic or hydraulic cylinder drive.

4. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that The floor cleaning device (100) comprises a lifting drive (134) for lowering and raising the cleaning device (120), wherein the cleaning tool (126) is engaged with the floor surface (104) during cleaning operation of the floor cleaning device (100) in forward travel, in particular in the main direction of movement (118), preferably that the cleaning device (120) is raised from the floor surface (104) in a reverse travel, in particular against the main direction of movement (118).

5. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the dirt collection device (140) is raised from the floor surface (104) during the cleaning operation of the floor cleaning device (100) in a reverse movement, in particular against the main direction of movement (118), wherein the floor cleaning device (100) preferably comprises a lifting drive (146) for lowering and raising the dirt collection device (140).

6. Mobile floor cleaning device (100) according to one of claims 2 to 4, characterized by the fact that the floor cleaning device (100) comprises a control unit (106) which is coupled to the adjusting element (158) and / or to the lifting drive (134, 146) for controlling the adjusting element (158) and / or the lifting drive (134, 146).

7. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the scraper device (148) is fixed to the cleaning device (120), in particular to a front side (164) of the cleaning device (120), with respect to the main direction of movement (118).

8. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that The scraper body (152) can be raised and lowered relative to the cleaning device (120) by means of an adjusting element (158) of the scraper device (148).

9. Mobile floor cleaning device (100) according to claim 8, characterized by the fact that a stroke of the scraper body (152) relative to the cleaning device (120) is the same as or different from a stroke of the cleaning device (120) relative to the floor cleaning device (100).

10. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the wiper body (152) comprises a retaining part (154) and an elastically deformable wiper lip (156) held on the retaining part (154), wherein the wiper lip (156) is preferably detachable from the retaining part (154).

11. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the scraper body (152) extends laterally beyond the cleaning device (120) in a direction transverse to the main direction of movement (118) on at least one side and preferably both sides.

12. Mobile floor cleaning device (100) according to claim 11 , characterized by the fact that the scraper body (152) has a lateral scraper section (174) extending rearward next to the cleaning device (120) on at least one side and preferably on both sides.

13. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that The scraper body (152) is pivotably held on a support part (150) by means of an adjusting element (158) via a joint arrangement (180) comprising two or more pivot links (160, 190), wherein in particular the cleaning device (120) comprises the support part (150) or the support part (150) is fixed to the cleaning device (120), in particular to a housing (124) of the cleaning device (120).

14. Mobile floor cleaning device (100) according to claim 13, characterized by the fact that the joint arrangement (180) comprises or forms a joint parallelogram (188).

15. Mobile floor cleaning device (100) according to claim 13 or 14, characterized by the fact that The joint arrangement (180) comprises a pivot member (160, 190) with which the adjusting element (158) is coupled, wherein the adjusting element (158) engages with a guide element (200) of the pivot member (160, 190) and pivots the pivot member (160, 190) relative to the support part (150) and to the wiper body (152) when the adjusting element (158) is actuated.

16. Mobile floor cleaning device (100) according to claim 15, characterized by the fact that the guiding element (200) is or comprises a stage guide (202).

17. Mobile floor cleaning device (100) according to one of claims 14 to 16, characterized in that the scraper body (152) is pivotable relative to the support part (150) under the action of at least one preloading element (162), wherein the preloading element (162) is preferably a mechanical spring element (206).

18. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the floor cleaning device (100) is a scrubber-dryer (102).

19. Mobile floor cleaning device (100) according to one of the preceding claims, characterized in that the floor cleaning device (100) is designed to be self-propelled and self-steering and / or that the floor cleaning device (100) is user-guided.

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