WO2009085624A1

WO2009085624A1 - Cleaning tool forming a three dimensional cleaning surface

Info

Publication number: WO2009085624A1
Application number: PCT/US2008/086333
Authority: WO
Inventors: Weilai JIANG
Original assignee: 3M Innovative Properties Company
Priority date: 2007-12-27
Filing date: 2008-12-11
Publication date: 2009-07-09
Also published as: CN101467858A; CN101467858B

Abstract

A cleaning tool that forms a three dimensional cleaning surface is disclosed. The cleaning tool comprises a base, an elastic restorable device and an adhering part. The elastic restorable device has an upper surface fixed to a bottom surface of the base. And a lower surface of the elastic restorable device is provided with a plurality of elastic restorable projections extending downwardly. The adhering part can detachably adhere a flexible cleaning sheet, and is fixed to a lower surface of the elastic restorable device and provided among the plurality of the elastic restorable projections. The thickness of the adhering part does not exceed heights of the elastic restorable projections. When the cleaning appliance is used together with a cleaning sheet, the cleaning sheet can form a cleaning surface with three dimensional structure, so that contaminant can distribute uniformly on the cleaning surface thereof.

Description

CLEANING TOOL FORMING A THREE DIMENSIONAL CLEANING SURFACE

Field

The present invention relates to a cleaning tool, more specifically, a cleaning tool that forms a three dimensional cleaning surface.

Background As a conventional floor cleaning tool, a flat plate mop generally comprises a mop plate and a cleaning cloth detachably fixed to a bottom surface of the mop plate. The advantage of the flat plate mop is large cleaning area, easy operation, and convenient replacement of the cleaning cloth. However, the conventional flat plate mop cleans the surface of the object to be cleaned by sliding in a manner that the cleaning surface of the cleaning cloth fixed to the mop plate contacts the objects to be cleaned. During cleaning, the dust and scraps on the objects to be cleaned are generally raised or pushed away when they contact the edges of the cleaning surface of the flat plate mop. Therefore, the dust, scrapes, etc. accumulate at the edges of the cleaning surface rather than enter into the center of the cleaning surface. Thus, after cleaning for a period of time, the edge portion of the cleaning cloth at the front part of the mop plate is filled with contaminant, whereas the central part of the mop plate is still clean.

For example, Figs. 1-4 show a conventional flat plate mop structure, in which a mop plate 100 is pivotally connected with a maneuvering lever 103 by a pivoting device 102 such a gimbal or bi-directional joint. A cleaning cloth 108 wraps around the bottom surface of the mop plate 100 to form a cleaning surface. During cleaning, the cleaning cloth 108, driven by the mop plate 100, slides on a surface of an object to be cleaned such as floor, etc., so that the surface of the object to be cleaned is cleaned accordingly. During cleaning, a "snow plow" phenomena occurs at the edge of the cleaning cloth 108. In other words, the dust and scraps on the surface of the object to be cleaned are pushed together to form a pile 109. The fine dust will be raised and scatters into the air during the process thereof. Accordingly, since the dust and scraps can not enter into the central position of the cleaning cloth 108, the dust distribution in Fig. 4 is formed: the contaminants 105 absorbed by the cleaning cloth 108 concentrates at the edge of the cleaning cloth 108, which can not enter into the central part thereof.

The "snow plow" phenomena is disadvantageous for efficiently picking up dust and reducing dust in the air. The main cause for the "snow plow" phenomena lie in that the cleaning surface of the cleaning cloth fixed to the mop plate presents a planar configuration, which leads to the planar displacement between the cleaning surface and the surface of the object to be cleaned.

For solving the problem thereof, a cleaning material having macroscopic three dimensional texture is proposed in US patent application No. 2001029966. The surface of the cleaning material has a regular, macroscopically distinguishable three dimensional texture with a certain height. Also, US patent application No. 2006029774 proposes a solution for achieving three dimensional cleaning surface by heating materials bonded together with different heat shrinkages. The solution in which the cleaning material is three dimensionalized can increase cleaning efficiency but there are some shortcomings. First, the cleaning material itself can not be easily cleaned while achieving the easiness of trapping contaminant due to the cleaning material itself having three dimensional shape. For example, the cleaning material in US 2001029966 is disposable, which is costly. Second, the three dimensional cleaning material manufactured with the above method is used mainly in dry cleaning, since the wetted fiber thus formed can not maintain excellent stiffness. When wet, the three dimensional cleaning effect is lost because the three dimensional structure cannot be supported under the wetting state thereof.

For the solution of directly obtaining three dimensional structure on the cleaning material, another proposal is provided for forming three dimensional shape on the bottom surface of the cleaning tool so that the cleaning material contacted with the bottom surface thereof achieves three dimensional structure.

As shown in Figs. 5 and 6, for example, US patent application No. 2005000047 discloses a floor cleaning tool with three dimensional projections 202 formed at the bottom of a cleaning disc 200, and a clipping mechanism 201 for detachably fixing the cleaning material is provided at a corner of the bottom surface of the cleaning disc. When a planar cleaning material is clipped onto the cleaning disc 200, the cleaning material adheres to the three dimensionalized bottom surface of the cleaning disc 200. However, in real usage, since the material of the cleaning material itself has a certain stiffness and tension, the three dimensional structure of the cleaning material can not be ideally achieved. The cleaning material is provided at the bottom of the three dimensional structure in real use, therefore planar contact of the cleaning material with the floor still exists in the cleaning process.

Referring to Figs. 7 and 8, a cleaning plate with three-dimensional structure is proposed in PCT application WO05051156. The cleaning plate 300 has a bottom surface with two three dimensional areas, i.e., a scraping area having scrapping capability at the center part thereof and a foam area formed by foam material around the scraping area. The two areas cooperate with each other to form a complete cleaning surface. In usage, projections 303 in the foam area first contact the floor under low pressure. When the applied pressure increases, the height of the projections 303 decreases, and the projecting points 302 in the scraping area start contacting the floor, and the dust on the floor is cleaned. With this structure, the foaming area and the scraping area functions in a for- and-aft order. However, the solution in WO 05051156 still can not overcome the three dimension defects of the cleaning material 304 wrapped by the fixing mechanism 301 With reference to Figs. 9 and 10, a cleaning tool is proposed in United States patent US6317917A, in which a plurality of angled ridges 401 are provided at a bottom surface of the mop plate 400, which form a regular three-dimensional structure. The contaminant and particles 403 on the floor may be embedded in grooves 402 formed by the ridges 401, so that they can be trapped. However, as mentioned above, since the cleaning tool is displaced in contact with floor during usage, the "snow plow" phenomena still can not be substantially obviated.

Summary

With the defects in conventional art, a cleaning appliance is proposed, and a cleaning surface with a three-dimension structure is formed when an object to be cleaned are cleaned with the cleaning appliance according to the present invention. According to an aspect of the present invention, a cleaning appliance is provided, comprising: a base; an elastic restorable device which has an upper surface fixed to a bottom surface of the base and a lower surface of the elastic restorable device is provided with a plurality of elastic restorable projections extending downwardly; and an adhering part for detachably adhering a flexible cleaning sheet, the adhering part being fixed to a lower surface of the elastic restorable device and provided among the plurality of the elastic restorable projections, with the thickness thereof not exceeding heights of the elastic restorable projections.

According to another aspect of the present invention, a cleaning appliance, comprising: a base made of rigid material; a plurality of elastic restorable projections provided at a lower surface of the base and extended downwardly; an adhering part for detachably adhering a flexible cleaning sheet, the adhering part being fixed to a lower surface of the base and provided among the plurality of the elastic restorable projections, with the thickness thereof not exceeding heights of the elastic restorable projections. According to still another aspect of the present invention, there is provided a mop comprising the above mentioned cleaning appliance and a cleaning sheet which at least wraps a lower surface of the cleaning appliance.

Brief Description of the Drawings The present invention will be further described with reference to the accompanying drawings, wherein:

Fig. 1 is a schematic view of a conventional flat plate mop structure; Fig. 2 is a schematic view when a surface of an object to be cleaned is cleaned with the flat plate mop in Fig. 1; Fig. 3 is an enlarged schematic view of portion 3 shown in Fig. 2;

Fig. 4 is a contaminant distribution photographic of the cleaning cloth after the surface is cleaned by the flat plate mop in Fig. 1;

Fig. 5 is a schematic view of the top of a conventional mop type floor cleaning tool; Fig. 6 is a schematic view of the bottom of the mop type floor cleaning tool in Fig. 5; Fig. 7 is a schematic view of a conventional three-dimension structural cleaning plate;

Fig. 8 is another schematic view of the cleaning plate in Fig. 7;

Fig. 9 is a schematic view of another conventional cleaning tool; Fig. 10 is a partial cross sectional view of the cleaning tool in Fig. 9 during use;

Fig. 1 Ia is a schematic view of one embodiment of the a cleaning tool according to the present invention;

Fig. 1 Ib is an enlarged schematic view of portion 11 shown in Fig. 11a;

Fig. 12a is a plan schematic view of a lower surface of one embodiment of a cleaning body in the cleaning appliance;

Fig. 12b is a plan schematic view of a lower surface of one embodiment of a cleaning body in the cleaning appliance

Fig. 12c is a plan schematic view of a lower surface of one embodiment of a cleaning body in the cleaning appliance Fig. 12d is a plan schematic view of a lower surface of one embodiment of a cleaning body in the cleaning appliance

Fig. 12e are plan schematic views of a lower surface of a cleaning body in the cleaning appliance;

Fig. 13a is a schematic view of another embodiment of the present invention; Fig. 13b is an enlarged schematic view of portion 13b shown in Fig. 13a;

Fig. 13c is a plan schematic view of a lower surface of the cleaning body in the cleaning appliance of Fig. 13a;

Fig. 14a is a schematic view when elastic restorable projections are not pressed in a case that a cleaning sheet wraps the cleaning appliance; Fig. 14b is an enlarged schematic view of portion 14b shown in Fig. 14a;

Fig. 15a is a schematic view when elastic restorable projections are pressed in a case that a cleaning sheet wraps the cleaning appliance;

Fig. 15b is an enlarged schematic view of portion 15b shown in Fig. 15a;

Fig. 16a is a schematic view when elastic restorable projections are pressed and then un-pressed in a case that a cleaning sheet wraps the cleaning appliance;

Fig. 16b is an enlarged schematic view of portion 16b shown in Fig. 16a; Fig. 17 is a contaminant distribution photographic view of the cleaning cloth after the surface is cleaned by the cleaning appliance;

Fig. 18a is a schematic view of the cleaning appliance in use according to another embodiment of the present invention; Fig. 18b is another schematic view of the cleaning appliance in Fig. 18a in use;

Fig. 18c is an enlarged schematic view of portion 18c shown in Fig. 18b

Fig. 19 is a shape schematic view of the surface of the object to be cleaned in the usage state of Fig. 18b.

Additional objects, advantages and aspect of the present invention will be more readily apparent for those skilled in the art guided by the following detailed description of preferred embodiment when taken together with accompanying drawings; such accompanying drawings and embodiment are only for the explanation purpose.

Detailed Description Exemplary embodiments will be described with reference to the attached figures, in which similar elements are designated with similar figure numerals.

Figs. 11a and 1 Ib are schematic views of a cleaning appliance, such as a flat plate mop 10 for cleaning a floor. According to an embodiment of the present invention, the cleaning appliance has a cleaning part 9 and a maneuvering lever 3 pivotally attached to an upper surface of the cleaning part 9. The cleaning part 9 comprises: a base 1, such as a mop plate etc., served as the body of the cleaning part 9; an elastic restorable device 4 which has an upper surface fixed to a lower surface of the base 1 and a lower surface of the elastic restorable device 4 is provided with a plurality of elastic restorable projections 5 extending downwardly; an adhering part 6 for detachably adhering a flexible cleaning sheet 8 (shown in Fig. 14a), wherein the adhering part 6 is fixed to a lower surface of the elastic restorable device 4 and provided among the plurality of the elastic restorable projections 5, with the thickness of the adhering part 6 not exceeding heights of the elastic restorable projections 5, that is, the elastic restorable projections 5 extend downwardly through the adhering part 6. It should be noted that the upper surface or lower surface is designated according to the case in which an object to be cleaned is cleaned by the cleaning appliance of an embodiment of the present invention, with the surface facing toward a surface of the object as the lower surface and the oppose surface to the lower surface as the upper surface.

In the exemplary embodiment of the flat plate mop 10 for cleaning the floor used as the cleaning appliance of the present invention, the shape of the cleaning part 9 or mop plate 1 is substantially rectangular, triangular, equilateral triangular, trapezoid, circular, etc. Fixing means such as an adhesive, hook, a clipping groove or other clipping mechanism etc. can be provided on an upper surface or side surface of the mop plate 10 for detachably wrapping the cleaning sheet 8 to the cleaning part 9.

The base may be made of a rigid material, such as hard material, polyester, metal, etc., so that the force from a user can be effectively and uniformly distributed on a whole bottom surface of the cleaning part 9. The maneuvering lever 3 is pivotally attached to the middle part at the upper surface of the base 1 by a pivoting mechanism 2, such as gimbal (or a bi-directional joint) so that the maneuvering lever 3 can pivot with respect to the mop plate 1 through the pivoting mechanism 2. The upper surface of the elastic restorable device 4 made of flexible material having shape memory property, such as foam material, rubber material, etc. is fixed to the lower surface of the base 1 by adhering, clipping or threading connection. The elastic restorable projections 5 can be formed by integrally extending the lower surface of the elastic restorable device 4 downwardly, so that a continuous plane is formed at a lower part of the elastic restorable device 4, and a three-dimensional structure is formed by the plurality of the elastic restorable projections 5 extending downwardly from the plane. The adhering part 6 can be preformed with via-holes (not shown) whose number and arrangement are corresponding to those of the elastic restorable projections 5. The diameters of the via-holes correspond with the maximum diameter of the elastic restorable projections 5. Preferably, the diameters thereof are slightly larger than the maximum diameter of the elastic restorable projections 5, so that the elastic restorable projections 5 can protrude under the lower surface of the adhering part 6 through respective via-hole when the adhering part 6 engages with the elastic restorable device 4, and normal engagement thereof is achieved therebetween. The engagement between the adhering part 6 and the elastic restorable device 4 of foam material can be achieved by adhesive, heating, ultrasonic vibration, etc. and it can also be achieved by direct foaming with the adhering part 6 provided in a mold beforehand during the foaming process of the foam material.

In one embodiment, the adhering part 6 comprises a hook and the cleaning sheet 8 comprises a loop so that the cleaning sheet 8 and adhering part 6 can be removably engaged with each other via a hook-loop fastener. In this embodiment, the cleaning sheet

8 can easily bond to the surface of the adhering part 6. In this embodiment, the lower surface of the adhering part 6 is provided with a plurality of barbed hooks 17. Although FIG. 13b shows a T-shaped hook, it is understood that a variety of hook shapes may be used for attaching to the cleaning sheet 8. The cleaning sheet 8 may be a reusable woven or knitted material or may be a semi-reusable or disposable nonwoven material. Such materials can provide a loop for attachment to the hook of the adhering part 6. Alternatively, the cleaning sheet 8 may be separately provided with a plurality of loop shaped structure.

In an exemplary embodiment, the cleaning sheet 8 may be nonwoven material available from Shanghai Huiquan Industry Co., Ltd., which is formed of polythylene terephthalate (PET) with 15 Denier and 50%wt, polypropylene (PP) with 5 Denier and 30% wt, and viscose with 2 Denier and 20% wt. However, the present invention is not limited hereto.

When the adhering part 6 contacts the flexible cleaning sheet 8, the barbed hooks 17 can easily hook the loop shaped structure on the cleaning sheet 8, so that the adhering part 6 and the cleaning sheet 8 bond together. In this case, if external force is applied, the cleaning sheet 8 can detach from the adhering part 6, so that the adhering part 6 and the cleaning sheet 8 separate accordingly.

Although the adhering part 6 is shown in FIG. 12a as a continuous sheet for placement around the elastic restorable projections 5, the adhering part 6 can be discrete portions place around or adjacent the elastic restorable projections 5. In both embodiments, the adhering part 6 pulls down the cleaning sheet 8 down and around the elastic restorable projections 5 so that a discernable three dimensional surface is created, which will be shown and described in more detail in FIGS. 14, 15, and 16. In a case that the elastic restorable device 4 is formed by elastic foam material, the main body thereof and the elastic restorable projections 5 can be foamed integrally by a mold. The foaming material can use EVA, polyurethane foam or PE foam, etc. When external force is applied on the elastic restorable projections 5, the heights thereof are shortened, and when the force is released, the heights thereof restores. The shape and the distribution of the elastic restorable projections 5 are shown in Figs. 12a-12e. In an exemplary embodiment, a plurality of the elastic restorable projections are formed into a plurality of rows. The cross section of the elastic restorable projections 5 can be designed into various shapes, such as circular, triangular, rhombus or trapezoid, elliptical shape, etc. as shown in Figs. 12a-12e. Alternatively, the elastic restorable projections 5 with different cross section can be arranged mixedly. Fig. 12c shows a mixed triangular and circular arrangement, and Fig. 12e shows another case. In addition, elastic restorable projections 5 with the same shape and different dimensions can be mixedly arranged, and the elastic restorable projections with different dimensions are arranged into rows spaced from each other.

In an exemplary embodiment, the ends of the plurality of the elastic restorable projections 5 are projected into a continuous line in a direction perpendicular to a long side, such as a long side 11, of the elastic restorable device 4. Thus, as shown in Fig. 12a, when objects to be cleaned are cleaned by the flat plate mop 10 in a direction perpendicular to the long side 11 (as shown by arrow G), there is at least one point to contact the surface of the objects to be cleaned in the direction perpendicular to the long side 11 if viewed from the short side 12 to another short side 13. Thus, it is ensured that dust is prevented from passing through the cleaning surface of the flat plate mop 10 and from leaking from the side 11 , such as the long side, contacting dust firstly to the other side. Further, the elastic restorable projections 5 can be so provided, when each elastic restorable projection 5 is pressed due to external force, that the compressed ends thereof are projected into a continuous line in a direction perpendicular to a long side, such as long side 11, of the elastic restorable device 5. Still further, in the plurality of the elastic restorable projections 5 provided in rows as shown in Fig. 12a, one elastic restorable projection 15 in a row thereof is provided between two neighboring elastic restorable projections 14, 16 in a neighboring row. With this structure, the elastic restorable projection 15 can compensate the gap between the elastic restorable projections 14 and

16 so that dust can be blocked compactly. As shown in Figs. 12c and 12d, acute angles 17 and 18 are provided toward the long side 11 of the elastic restorable projection 5 in the case that the cross section of the elastic restorable projection 15 has acute angles 17 and 18, so that the dust can be introduced into the center of the cleaning surface due to the acute angle structure without being pushing away.

According to still another embodiment of the present invention, as shown in Fig. 13a- 13c, a circle of recesses 7 are provided around each elastic restorable projection 15 on the elastic restorable device 4. The recess structure can increase the compressibility of the elastic restorable projections 5. Thus, when the cleaning sheet 8 wraps the lower part of the elastic restorable device, the pressing force required for three-dimensionalizing the cleaning sheet is less. The existence of the recesses 7 does not influence the integral formation of the elastic restorable device 4 with the elastic restorable projections 5, and in a similar manner, they can be integrally formed by foaming.

In use, the operating of the three-dimensionalizing the flexible cleaning sheet 8 is shown in Figs . 14a- 16b :

First, the cleaning sheet 8 is clipped to the clipping mechanism of the base 1 so that the cleaning sheet 8 wraps the bottom surface of the base 1 covered by the elastic restorable device 4. Then, the pressing force is applied downwardly by a user so that the height of the elastic restorable projections 5 on the elastic restorable device 4 decreases after the force is applied until the barbed hooks 17 of the adhering part 6 contacts the loop structure at the back of the cleaning sheet 8. At this time, since there is a certain bonding force between the loop structure at the back of the cleaning sheet 8 and the barbed hooks 17 on the adhering part 6, partial bonding between the cleaning sheet 8 and the adhering part 6 is achieved. Finally, the pressing force is released, the height of the elastic restorable projections 5 on the surface of the elastic restorable device 4 restores due to the resilience thereof, and the barbed hooks 17 of the adhering part 6 still bond partial area at the back of the cleaning sheet 8, and thereby the cleaning sheet 8 is three- dimensionalized under the functions of the elastic restorable projections 5 and the adhering part 6, which results in a three-dimensionalized cleaning sheet. The technical effects of the design thereof can be validated by tests. Refer to Fig. 4 and Fig. 17. Firstly, blue powder of 0.1 gram is scattered evenly in an area Im by Im. Then, the three-dimension elastic restorable device according to the present invention and the conventional plane foaming material are mounted on the bottom surfaces of two mop plates of a size 26cmx9cm, respectively, and terylene knitted non-woven cloth of 150 g/m² is clipped, forming the conventional flat plate mop as shown in Fig. 1 and the three-dimensionalized mop according to the present invention for cleaning in the area.

After cleaning for a period of time, the distribution of the blue powder 22 is shown as in the photograph of Fig. 17. Fig. 4 shows the powder distribution on a flat plate mop using conventional plane foam material. It can be seen that the powder distribution on the cleaning surface of the cleaning sheet 8 is even without accumulating at the edge of the cleaning surface for the mop having the three-dimensionalized elastic restorable projection structure, and the load of the cleaning sheet distributes evenly too. Conversely, on the flat plane cleaning surface of the conventional mop in Fig. 4, the powder concentrates at the edges of the cleaning surface even under saturation condition, and the central area is still clean. According to the three-dimensionalized cleaning appliance, it can not only be used as a mop for cleaning floor but also as other cleaning tools. As shown in Figs. 18a- 18c, the cleaning appliance according to the present invention can be configured as a brush type configuration having a maneuvering handle 21 fixed to the base 1. The brush is adapted to a surface to be cleaned having a concave-convex structure as shown in Fig. 19 especially. For example, there are seams 19 at the junctions of ceramic tiles 20 in a wall structure having tiles, and the seams 19 are always recessed. If a plane cleaning surface of a cleaning tool is used for cleaning the wall having the seams 19, the seams 19 can not easily be contacted by the cleaning surface of the cleaning tool. However, if a cleaning tool having the three-dimensionalized cleaning surface is used, since each projection on the cleaning surface can be pressed independently, when the recess on the surface to be cleaned is encountered, the heights of the elastic restorable projections 5 at the recesses can be restored so that the bottom part of the recess is contacted, and thus the bottom part can be cleaned accordingly.

Although the embodiment in which the elastic restorable projections 5 are provided at the lower surface of the mop plate by using the main part of the elastic restorable device 4 as the carrier is described above, the present invention is not limited thereto. In an improved exemplary embodiment, the plurality of the elastic restorable projections 5 can be directly fixed to the lower surface of the base 1 made of rigid material by adhering, splicing or clipping connection, etc. Thus, the planar main body part in the elastic restorable device can be omitted, and the thickness of the whole cleaning part 9 is reduced. Under this circumstance, the adhering part 6 can be directly fixed to the lower surface of the base 1 by adhesive, heat connection and ultrasonic connection, and be provided between the plurality of the elastic restorable projections 5, and the thickness of the adhering part 6 does not exceed the height of the elastic restorable projections 5 so that the elastic restorable projections 5 can extend outward by passing through the adhering part 6.

The description of present invention is only for illustration purpose, and therefore, modifications, alterations and substitutions may be made in these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined in the claims and the equivalents thereof.

Claims

What is claimed is:

1. A cleaning appliance, comprising: a base (1); an elastic restorable device (4) which has an upper surface fixed to a lower surface of the base and a lower surface of the elastic restorable device is provided with a plurality of elastic restorable projections extending downwardly; and an adhering part (6) for detachably adhering a flexible cleaning sheet, the adhering part being fixed to a lower surface of the elastic restorable device and provided among the plurality of the elastic restorable projections, with the thickness thereof not exceeding heights of the elastic restorable projections.

2. The cleaning appliance according to claim 1, further comprising: a pivoting device (2) provided on an upper surface of the base; a maneuvering lever (3) connected to the pivoting device to be pivotable with respect to the base by the pivoting device.

3. The cleaning appliance according to claim 1, wherein the elastic restorable projections is formed by foam material.

4. The cleaning appliance according to claim 1, wherein the adhering part comprises a hook-shaped structure (17) of a hook- loop fastener.

5. The cleaning appliance according to claim 1, wherein ends of the plurality of elastic restorable projections are projected into a continuous line in a direction perpendicular to a long side of the elastic restorable device.

6. The cleaning appliance according to claim 1, wherein when the plurality of elastic restorable projections contract due to pressure, contracted ends thereof are projected into a continuous line in a direction perpendicular to a long side of the elastic restorable device.

7. The cleaning appliance according to claim 6, wherein the plurality of the elastic restorable projections are formed into rows, in which a elastic restorable projection in a row is provided between two neighboring elastic restorable projections in a neighboring row.

8. The cleaning appliance according to any one of claims 5-7, wherein the elastic restorable projections have cross sections with round or elliptical shape.

9. The cleaning appliance according to any one of claims 5-7, wherein the elastic restorable projections have cross sections with triangle or polygon shape.

10. The cleaning appliance according to claim 9, wherein the elastic restorable projections are angled toward the long side of the elastic restorable device.

11. The cleaning appliance according to claim 1, wherein a circle of recesses (7) are provided around each elastic restorable projection on the lower surface of the elastic restorable device.

12. The cleaning appliance according to claim 1, wherein an operation handle is provided on the upper surface or side of the base.

13. A cleaning appliance, comprising: a base (1) made of rigid material; a plurality of elastic restorable projections (5) provided at a lower surface of the base and extended downwardly; an adhering part (6) for detachably adhering a flexible cleaning sheet, the adhering part being fixed to a lower surface of the base and provided among the plurality of the elastic restorable projections, with the thickness thereof not exceeding heights of the elastic restorable projections.

14. The cleaning appliance according to claim 13, further comprising: an elastic restorable device (4) provided between a lower surface of the base and an upper surface of the adhering part, the plurality of elastic restorable projections extend downwardly from the lower surface of the elastic restorable device.

15. A mop comprising the cleaning appliance according to claim 1 or 13 and a cleaning sheet which at least wraps a lower surface of the cleaning appliance.