Floor cleaning device

Abstract

To reduce a movement of the center of gravity with respect to a floor through a washing step.SOLUTION: An internal container 151 is a bottomed cylindrical container. A central axis O of the internal container 151 extends in parallel in a vertical direction. An area F1 orthogonally projects the internal container 151 to a floor surface G. An outer container 131 is a bottomed rectangular cylindrical container arranging the internal container 151 inside. Of the outer container 131, a surface that does not cross the central axis O of the internal container 151 is parallel to a z axis. A center of gravity Pgo is that of the outer container 131. A perpendicular line to the floor surface G of the center of gravity Pgo of the outer container 131 is configured to always pass an orthogonal projection surface to the floor surface G of the internal container 151.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to the technology of floor cleaning devices. [Background technology]

[0002] A cleaning device for cleaning floors, etc. has been developed. The cleaning device brings cleaning water containing detergent etc. into contact with the object to be cleaned, such as a floor, and cleans the object by capturing dirt, dust, and other contaminants adhering to the object into the cleaning water and collecting the dirt. Generally, the cleaning device has containers for holding the cleaning water before use and the cleaning water after use.

[0003] Patent Document 1 discloses a water tank in which an inner cavity is separated into two by moving a partition disposed inside, and the volumes of the two are adjusted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-136485 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, cleaning water is stored before and after cleaning in two cavities separated by a partition, but the amount and density of the cleaning water change throughout the cleaning process, making the center of gravity of the cleaning water container unstable.

[0006] One object of the present invention is to reduce the movement of the center of gravity of a floor cleaning device relative to the floor throughout the cleaning process. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a method for cleaning a floor and using either pre-use or post-use cleaning water. CylindricalThe inner container is placed inside the washing machine, and the other of the pre-use and post-use washing water is placed inside the washing machine, and the perpendicular line of the center of gravity to the floor passes through the orthogonal projection plane of the inner container onto the floor. Cylindrical In a first aspect, a floor cleaning device housed in an outer container is provided.

[0008] According to the floor cleaning device of the first aspect, it is possible to reduce the movement of the center of gravity relative to the floor throughout the cleaning process.

[0009] In the floor cleaning device of the first aspect, a configuration may be adopted as a second aspect in which the center of gravity of the polygon formed by the points of contact with the floor is within the area obtained by orthogonally projecting the outer shape of the inner container onto the floor.

[0010] According to the floor cleaning device of the second aspect, the posture is more stable than when the center of gravity of the polygon formed by the points of contact with the floor is not within the area obtained by orthogonally projecting the outer shape of the inner container.

[0011] In a third aspect, the floor cleaning device of the second aspect may have a configuration in which the device has wheels that come into contact with the floor at the contact points and travel on the floor.

[0012] According to the floor cleaning device of the third aspect, it can travel on the floor in a stable posture compared to when the center of gravity of the polygon formed by the points of contact with the floor is not within the area obtained by orthogonally projecting the outer shape of the inner container.

[0013] In the floor cleaning device according to any one of the first to third aspects, the outer container and the inner container (Excluding items whose shape changes depending on the amount of storage) A fourth aspect may be such that the perpendicular line of the combined center of gravity of the respective centers of gravity of the cleaning water contained in the inner container to the floor passes through the orthogonal projection plane of the cleaning water contained in the inner container onto the floor, regardless of the respective amounts of the cleaning water.

[0014] According to the floor cleaning device of the fourth aspect, The shape of each container does not change depending on the capacity. The inner and outer containers are R Even if the amount of washing water changes, a stable posture is maintained. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing an example of the appearance of a floor cleaning device 1 according to an embodiment of the present invention. [Figure 2] 1 is a perspective view showing an example of the internal configuration of a floor cleaning device 1. FIG. [Figure 3] 1 is an elevation view showing an example of the internal configuration of the floor cleaning device 1. FIG. [Figure 4] FIG. 2 is a plan view of the internal configuration of the floor cleaning device 1 as seen from above. [Figure 5] 4 is a view looking downward from plane L shown in FIG. 3. [Figure 6] FIG. 10 is a diagram illustrating the orthogonal projection of each container onto the floor. [Figure 7] FIG. 10 is a plan view showing an example of the area of ​​each container projected orthogonally onto the floor. [Figure 8] FIG. 10 is a diagram showing an example of the relationship between a polygon formed by points of contact with the floor and the orthogonal projection plane of the inner container 151 onto the floor. [Figure 9] 10A and 10B are diagrams illustrating an example of how the amount of cleaning water contained in the container changes throughout the cleaning process. DETAILED DESCRIPTION OF THE INVENTION

[0016] <Embodiment> <Configuration of floor cleaning device> In the following figures, the space in which each component is located is represented as an xyz right-handed coordinate space. Among the coordinate symbols shown in the figures, a dot in a circle represents an arrow pointing from the back of the page to the front, and a circle with two intersecting lines represents an arrow pointing from the front of the page to the back. The direction along the x-axis in space is called the x-axis direction. The direction in the x-axis direction where the x component increases is called the +x direction, and the direction where the x component decreases is called the -x direction. The y- and z-components are also defined as the y-axis, +y direction, -y direction, z-axis, +z direction, and -z direction, according to the above definitions. In the following figures, the -z direction is the direction of gravity.

[0017] Fig. 1 is a perspective view showing an example of the appearance of a floor cleaning device 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing an example of the internal configuration of the floor cleaning device 1. Fig. 3 is an elevation view showing an example of the internal configuration of the floor cleaning device 1.

[0018] The floor cleaning device 1 has a housing 10, a control panel 11, and a squeegee 12. The floor cleaning device 1 also has a supply section 13, a cleaning unit 14, a recovery section 15, and a pressure reduction section 16 inside the housing 10.

[0019] <Case configuration> The housing 10 is a member that covers the side surfaces of the internal components of the floor cleaning device 1 and houses them inside. The housing 10 has a cover 101, rear wheels 103, and a handle 104. The housing 10 also has front wheels 102 (see FIG. 7) that are not shown in FIG. 1. The cover 101 is a member that protects the internal components and is made of, for example, synthetic resin. The front wheels 102 and rear wheels 103 are wheels that support the floor cleaning device 1 so that it can move. The handle 104 is a grip that the user can use to adjust the direction of travel of the floor cleaning device 1.

[0020] <Control panel configuration> The control panel 11 is installed on top of the housing 10 and is a device that controls the floor cleaning device 1. The control panel 11 has a display unit 111 and an operation unit 112. The display unit 111 is, for example, a liquid crystal display, and displays images that notify the user of the status of the floor cleaning device 1. The operation unit 112 is a panel on which switches, dials, and other controls that the user uses to operate the floor cleaning device 1 are arranged. The control panel 11 also has a hinge 113 (not shown in FIG. 1) (see FIG. 6).

[0021] <Squeegee configuration> The squeegee 12 is a component that removes used cleaning water that has been scattered on the floor. The squeegee 12 has a blade made of, for example, rubber, which is pressed against the floor to prevent the cleaning water from spreading or flowing out. The squeegee 12 shown in FIG. 1 is positioned in the -y direction when viewed from the main body of the floor cleaning device 1, and has a blade that extends approximately in the x-axis direction. By pressing this blade against the floor, the cleaning water that has been scattered directly below the main body of the floor cleaning device 1 is wiped away by the squeegee 12, preventing it from spreading or flowing out in the -y direction.

[0022] <Supply Section Configuration> 3 is configured to supply new cleaning water to the cleaning unit 14. The supply unit 13 has an inlet 130, an outer container 131, a supply pipe 132, a water level indicator pipe 133, and a supply pump 134.

[0023] The outer container 131 is a container for storing new cleaning water before use, and uses the outer wall surface of the inner container 151 (described later) as part of the inner wall surface.

[0024] The inlet 130 is an opening through which cleaning water before use is poured into the outer container 131. The supply pipe 132 is connected to a supply hole 1310 provided at the bottom of the outer container 131, and is a pipe that sends the cleaning water contained in the outer container 131 to a supply pump 134. The water level indicator pipe 133 is a pipe whose lower end communicates with the supply pipe 132 and whose upper end is open to the atmosphere. The amount of cleaning water contained in the outer container 131 is displayed to the user by the water level indicated by the water level indicator pipe 133.

[0025] The supply pump 134 shown in FIG. 3 is, for example, a screw pump or a diaphragm pump, and discharges cleaning water drawn in from the supply pipe 132 in the direction of the arrow to supply it to the cleaning unit 14.

[0026] <Cleaning unit configuration> 3 includes a drive unit 141 and a brush 142. The brush 142 rotates about an axis extending substantially parallel to the z-axis direction to scrub the floor on which cleaning water has been sprinkled. The drive unit 141 rotates the brush 142 using a motor, and supplies cleaning water received from the supply pump 134 to the brush 142.

[0027] <Configuration of the collection section> The recovery unit 15 shown in Fig. 3 has an inner container 151, a recovery pipe 152, and a lid 153. The inner container 151 is a tank for recovering and storing used cleaning water used in cleaning. The recovery pipe 152 is a pipe that sucks and recovers the cleaning water that has been spread on the floor and used to clean the floor with the rotating brush 142 from the area blocked by the squeegee 12. As shown in Fig. 1, the lower end of this recovery pipe 152 is located above the squeegee 12, and the upper end is connected to the lid 153.

[0028] The lid 153 is a lid that closes an opening 1511 provided at the top of the inner container 151. The opening 1511 provided in the inner container 151 can be opened and closed by the lid 153.

[0029] <Lid configuration> 4 is a plan view showing the internal configuration of the floor cleaning device 1. As shown in Fig. 4, the lid 153 covers the upper part of the inner container 151. The lid 153 has a recovery hole 1531, a suction hole 1532, a hook 1533, and a sensor 1534.

[0030] The recovery hole 1531 is a hole that penetrates the lid 153 and is a hole for sending used cleaning water into the inner container 151. The cleaning water used for cleaning is recovered into the inner container 151 through the above-mentioned recovery pipe 152 and this recovery hole 1531.

[0031] In other words, the floor cleaning device 1 having this inner container 151 and the outer container 131 described above is an example of a floor cleaning device that cleans the floor, stores used cleaning water in the inner container, and stores pre-used cleaning water in the outer container inside which the inner container is placed.

[0032] The suction hole 1532 is a hole that penetrates the lid 153 and is a hole for reducing the pressure inside the inner container 151. Air inside the inner container 151, whose opening 1511 is closed by the lid 153, is sucked out of the inner container 151 through the suction pipe 162 (described later) and the suction hole 1532. This reduces the pressure inside the inner container 151, and the cleaning water blocked by the squeegee 12 is sucked out from the lower end of the recovery pipe 152.

[0033] Hook 1533 is, for example, a ring-shaped handle attached to the top surface of lid 153. When a user grasps and lifts hook 1533, lid 153 moves away from opening 1511 of inner container 151, and inner container 151 opens.

[0034] Sensor 1534 is a sensor that penetrates lid 153 and extends into the interior of inner container 151. Sensor 1534 detects the level, i.e., the amount, of used flush water contained in inner container 151 based on the state of electrical conduction when its tip is submerged in the flush water. A signal indicating the detection result is sent to control panel 11.

[0035] <Configuration of pressure reducing section> The pressure reducing unit 16 shown in FIG. 3 includes a filter 161 , a suction pipe 162 , an exhaust pipe 163 , and a vacuum pump 164 .

[0036] The filter 161 is a filtering mechanism that is installed on the underside of the lid 153, below the suction hole 1532, and removes solid matter such as dust and dirt contained in the air stored in the inner container 151 as the air passes through the suction hole 1532 and flows into the suction pipe 162.

[0037] The suction pipe 162 is a pipe whose upper end is connected to a suction hole 1532 provided in the lid 153 and whose lower end is connected to the suction side (suction) of a vacuum pump 164. The exhaust pipe 163 is a pipe whose one end is connected to the exhaust side (delivery) of the vacuum pump 164 and whose other end is open to the atmosphere. Air sucked in by the vacuum pump 164 is discharged from the exhaust pipe 163.

[0038] The vacuum pump 164 is, for example, a rotary pump, a roots pump, or the like, and sucks air from the inside of the inner container 151 through a suction pipe 162 and exhausts it through an exhaust pipe 163. In this way, the vacuum pump 164 reduces the pressure inside the inner container 151.

[0039] <Detailed configuration of each container> Fig. 5 is a view looking downward from plane L shown in Fig. 3. As described above, the outer wall surface of the inner container 151 is used as part of the inner wall surface of the outer container 131. A drain outlet 1510 is provided at the end in the -y direction of the bottom surface of the inner container 151. A supply hole 1310 is provided at the bottom surface of the outer container 131. As described above, this supply hole 1310 is connected to the supply pipe 132.

[0040] Fig. 6 is a diagram for explaining the orthogonal projection of each container onto the floor, showing the inner container 151 and the outer container 131 as viewed from the +x direction toward the -x direction.

[0041] The inner container 151 shown in Fig. 6 is a cylindrical container with a bottom (i.e., a bottomed cylindrical body). The central axis O of the inner container 151 shown in Fig. 6 extends parallel to the z-axis direction (i.e., the vertical direction). The area F1 shown in Fig. 6 is the area obtained by orthogonally projecting the inner container 151 onto the floor surface G. Therefore, this area F1 has the same shape and size as a cross section in any xy plane that intersects with the inner container 151.

[0042] The outer container 131 shown in Fig. 6 is a rectangular cylindrical container with a bottom, inside which the inner container 151 is placed. All surfaces of this outer container 131 that do not intersect with the central axis O of the inner container 151 are parallel to the z-axis. Area F2 shown in Fig. 6 is the area obtained by orthogonally projecting the outer container 131 onto the floor G. Therefore, this area F2 has the same shape and size as a cross section in any xy plane that intersects with the outer container 131.

[0043] The center of gravity Pgo shown in FIG.

[0044] The inner wall surface of inner container 151 does not have a convex area. Therefore, solid matter such as dust and dirt contained in the collected cleaning water is unlikely to remain on the inner wall surface. Furthermore, since the inner wall surface does not have a convex area, the user can easily clean the inner wall of inner container 151 through opening 1511 by removing lid 153.

[0045] 6, the floor cleaning device 1 is in contact with the floor surface G by the front wheels 102 and rear wheels 103 provided on the housing 10. The contact point Pc2 shown in FIG. 6 is the point where the front wheels 102 contact the floor surface G, and the contact point Pc3 is the point where the rear wheels 103 contact the floor surface G.

[0046] 6 has, for example, one front wheel 102 in the +y direction from the central axis O, and two rear wheels 103, one in the +x direction and one in the -x direction from the central axis O. The front wheel 102 and the rear wheel 103 are both wheels that allow the floor cleaning device 1 to travel on the floor surface G. In other words, this floor cleaning device 1 is an example of a floor cleaning device that has wheels that make contact with the floor at contact points and travel on the floor.

[0047] 6, the floor cleaning device 1 has a hinge 113 at the end in the +y direction on the top surface of the cover 101. The hinge 113 is attached so that the control panel 11 can swing relative to the housing 10 around an axis parallel to the x-axis.

[0048] FIG. 7 is a plan view showing an example of the area obtained by orthogonally projecting each container onto the floor. As described above, area F1 is the area obtained by orthogonally projecting the inner container 151 onto the floor G, and area F2 is the area obtained by orthogonally projecting the outer container 131 onto the floor G. Point Pg2 is the point obtained by orthogonally projecting the center of gravity Pgo of the outer container 131 (see FIG. 6) onto the floor G. This point Pg2 is always located inside area F1. The line connecting the center of gravity Pgo and point Pg2 is a perpendicular line extending from the center of gravity Pgo to the floor G. In other words, the perpendicular line of the center of gravity Pgo of the outer container 131 to the floor G is configured to always pass through the orthogonal projection plane of the inner container 151 onto the floor G.

[0049] That is, this outer container 131 is an example of an outer container in which an inner container is placed and the perpendicular line of the center of gravity to the floor passes through the orthogonal projection plane of the inner container onto the floor.

[0050] With this configuration, the floor cleaning device 1 can stand stably on the floor surface G without losing balance of the center of gravity.

[0051] The configurations, shapes, sizes, and layout relationships described in the above embodiments are merely schematic illustrations to enable understanding and implementation of the present invention. Therefore, the present invention is not limited to the described embodiments, and can be modified in various forms without departing from the scope of the technical ideas set forth in the claims.

[0052] <Modification> The above is a description of the embodiment, but the contents of this embodiment can be modified as follows. In addition, the following modifications can be combined.

[0053] <1> In the above-described embodiment, the inner container 151 is a cylindrical body with a bottom, and the outer container 131 is a rectangular cylindrical body, but they may have other shapes. Furthermore, the floor cleaning device 1 is in contact with the floor surface G with the front wheels 102 and the rear wheels 103, but the floor cleaning device 1 does not have to come into contact with the floor surface G with wheels. For example, the floor cleaning device 1 may come into contact with the floor surface G with a pillar or the like with a sliding surface facing downward. In this case, the floor cleaning device 1 may move in a sliding manner on the floor surface G.

[0054] Furthermore, in the above-described embodiment, the floor cleaning device 1 stores used cleaning water in the inner container 151, and stores unused cleaning water in the outer container 131 inside which the inner container 151 is placed, but it is also possible to store unused cleaning water in the inner container 151, and store used cleaning water in the outer container 131. In this case, it is sufficient that the connections of the supply pipe 132 and the recovery pipe 152 are interchanged with those in the embodiment.

[0055] In short, the floor cleaning device 1 of the present invention is a floor cleaning device that cleans a floor, stores one of the pre-use and post-use cleaning water in an inner container, and stores the other of the pre-use and post-use cleaning water in an outer container in which the inner container is placed inside and the perpendicular line of the center of gravity to the floor passes through the orthogonal projection plane of the inner container onto the floor.

[0056] <2> In the above-described embodiment, the relationship between the contact points Pc2 and Pc3 and the area F1 is not particularly mentioned, but there may be a fixed relationship between them. For example, the floor cleaning device 1 may be configured so that the center of gravity of a polygon formed by the contact points Pc2, Pc3, etc. that contact the floor surface G is located within the area F1.

[0057] Fig. 8 is a diagram showing an example of the relationship between a polygon formed by contact points with the floor and the orthogonal projection plane of the inner container 151 onto the floor. In this case, as described above, the floor cleaning device 1 contacts the floor surface G at one contact point Pc2 and two contact points Pc3. The center of gravity Pg3 shown in Fig. 8 is the center of gravity of the triangle F3 formed by the contact points Pc2 and Pc3. It is sufficient that this center of gravity Pg3 exists inside the above-mentioned area F1.

[0058] In this case, the center of gravity of the contact points of the floor cleaning device 1 with the floor is within the orthogonal projection plane of the inner container 151 onto the floor, that is, within the area F1 obtained by orthogonally projecting the outer shape of the inner container 151 onto the floor surface G, so the weight of the inner container 151 is stably supported by the floor surface G. Although there are three contact points between the floor cleaning device 1 and the floor surface G in this modified example, there may be four or more. In other words, this floor cleaning device 1 is an example of a floor cleaning device in which the center of gravity of the polygon formed by the contact points with the floor is within the area obtained by orthogonally projecting the outer shape of the inner container onto the floor.

[0059] <3> In the above-described embodiment, the perpendicular line of the center of gravity Pgo of the outer container 131 to the floor surface G was configured to always pass through the orthogonal projection plane of the inner container 151 onto the floor surface G, but a predetermined restriction may be imposed on the perpendicular line extending from the combined center of gravity obtained by combining the centers of gravity of the cleaning water contained in the outer container 131 and the inner container 151.

[0060] Figure 9 is a diagram illustrating an example of how the amount of flushing water contained in the container changes throughout the flushing process. Figure 9 shows the floor surface G and the flushing water contained in the outer container 131 and the inner container 151. In Figure 9, the flushing water contained in each container is represented by hatching.

[0061] At the beginning of the flushing process, the flush water contained in each container is as shown in Figure 9(a). That is, the water level of the unused flush water contained in outer container 131 is higher than the water level of the used flush water contained in inner container 151. At this time, the center of gravity Pgwo of the flush water contained in outer container 131 and the center of gravity Pgwi of the flush water contained in inner container 151 are combined to obtain a combined center of gravity Pgw. The combined center of gravity Pgw is the center of gravity of all the flush water contained in outer container 131 and inner container 151. A perpendicular line Lg drawn from this combined center of gravity Pgw to floor surface G passes through the above-mentioned area F1.

[0062] In the middle of the flushing process, the flush water contained in each container changes as shown in Figure 9(b). That is, the water level of the unused flush water contained in outer container 131 is almost the same as the water level of the used flush water contained in inner container 151. Even at this time, the perpendicular line Lg drawn from the combined center of gravity Pgw, which is the combination of the center of gravity Pgwo of the flush water contained in outer container 131 and the center of gravity Pgwi of the flush water contained in inner container 151, to floor surface G passes through the above-mentioned area F1.

[0063] At the end of the cleaning process, the flush water contained in each container is as shown in Figure 9(c). That is, the water level of the unused flush water contained in outer container 131 is lower than the water level of the used flush water contained in inner container 151. Even at this time, the perpendicular line Lg drawn from the combined center of gravity Pgw, which is the combination of the center of gravity Pgwo of the flush water contained in outer container 131 and the center of gravity Pgwi of the flush water contained in inner container 151, to floor surface G passes through the above-mentioned area F1.

[0064] In other words, no matter how much cleaning water is contained in each of the outer container 131 and the inner container 151, the perpendicular line Lg dropped from the combined center of gravity Pgw, which is the center of gravity of the entire cleaning water, to the floor surface G passes through the area F1, which is the area obtained by orthogonally projecting the inner container 151 onto the floor surface G. In other words, this floor cleaning device 1 is an example of a floor cleaning device in which the perpendicular line to the floor of the combined center of gravity, which is the combination of the centers of gravity of the cleaning water contained in the outer container and the inner container, passes within the plane of orthogonal projection onto the floor of the cleaning water contained in the inner container, regardless of the respective amounts of cleaning water.

[0065] With this configuration, at any time during the cleaning process, the perpendicular line Lg dropped from the combined center of gravity Pgw passes through the plane of orthogonal projection of the inner container 151 onto the floor, so the floor cleaning device 1 can continue to maintain a stable posture.

[0066] <4> In the above-described embodiment, the central axis O of the inner container 151 is parallel to the vertical direction, but this central axis O may be inclined relative to the vertical direction as long as the perpendicular line of the center of gravity Pgo of the outer container 131 to the floor surface G passes through the above-described region F1.

[0067] <5> Furthermore, although the surfaces of the outer container 131 that do not intersect with the central axis O of the inner container 151 are all parallel to the z-axis, they may be inclined relative to the z-axis direction (i.e., the vertical direction). In this case, it is sufficient that the perpendicular line to the floor surface G of the center of gravity Pgo of the outer container 131 passes through the above-mentioned region F1.

[0068] Furthermore, in this case, it is desirable that the perpendicular line Lg dropped from the combined center of gravity Pgw, which is the combination of the center of gravity Pgwo of the cleaning water contained in the outer container 131 and the center of gravity Pgwi of the cleaning water contained in the inner container 151, passes through the above-mentioned area F1. [Explanation of symbols]

[0069] 1...floor cleaning device, 10...casing, 101...cover, 102...front wheel, 103...rear wheel, 104...handle, 11...control panel, 111...display unit, 112...operation unit, 113...hinge, 12...squeegee, 13...supply unit, 130...inlet, 131...outer container, 1310...supply hole, 132...supply pipe, 133...water level indicator tube, 134...supply pump, 14...cleaning unit, 141...drive unit, 142...brush, 15...recovery unit, 151...inner container, 15 10...Drain outlet, 1511...Opening, 152...Recovery pipe, 153...Cover, 1531...Recovery hole, 1532...Suction hole, 1533...Hook, 1534...Sensor, 16...Pressure reduction section, 161...Filter, 162...Suction pipe, 163...Exhaust pipe, 164...Vacuum pump, F1...Area, F2...Area, F3...Triangle, Pc2...Contact point, Pc3...Contact point, Pg2...Point, Pg3...Center of gravity, Pgo...Center of gravity, Pgw...Composite center of gravity, Pgwi...Center of gravity, Pgwo...Center of gravity.

Claims

1. A floor cleaning device for cleaning floors, storing one of the pre-use and post-use cleaning water in a cylindrical inner container (excluding those whose shape changes depending on the amount of water stored), and storing the other of the pre-use and post-use cleaning water in a cylindrical outer container, the inner container being placed inside and the perpendicular line of the center of gravity to the floor passing through the orthogonal projection plane of the inner container onto the floor.

2. The center of gravity of the polygon formed by the contact points with the floor is within the area obtained by orthogonally projecting the outer shape of the inner container onto the floor. The floor cleaning device according to claim 1 .

3. The vehicle has wheels that come into contact with the floor at the contact points and run on the floor. The floor cleaning device according to claim 2.

4. The perpendicular line of the combined center of gravity of the cleaning water contained in the outer container and the inner container to the floor passes through the orthogonal projection plane of the cleaning water contained in the inner container onto the floor, regardless of the amount of each. The floor cleaning device according to any one of claims 1 to 3.

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