CN217852771U

CN217852771U - Cleaning device

Info

Publication number: CN217852771U
Application number: CN202220969545.3U
Authority: CN
Inventors: 卞敏浩; 李进忠
Original assignee: Dreame Innovation Technology Suzhou Co Ltd
Current assignee: Dreame Innovation Technology Suzhou Co Ltd
Priority date: 2021-04-28
Filing date: 2022-04-25
Publication date: 2022-11-22
Anticipated expiration: 2032-04-25
Also published as: CN216221351U; CN216221350U; CN216652195U

Abstract

The utility model discloses a cleaning device belongs to clean technical field. Wherein, cleaning device includes: the floor brush assembly is suitable for cleaning a surface to be cleaned; the machine body assembly is connected with the floor brush assembly and is suitable for generating negative pressure so that dirt on a surface to be cleaned can enter the floor brush assembly; and a liquid delivery assembly at least partially in communication with the floor brush assembly; the liquid conveying assembly comprises a pump body, the direction of the ground brush assembly is the front, and the pump body is located at one end, close to the ground brush assembly, of the machine body assembly and is arranged in front of the center line of the machine body assembly. In this way, the installation space of the floor brush assembly can be saved, the whole volume of the floor brush assembly is reduced, the effect of improving the trafficability of the floor brush assembly in a complex cleaning scene is achieved, the cleaning efficiency of the cleaning equipment is improved, and the overall attractiveness of the cleaning equipment is ensured.

Description

Cleaning device

The present application claims priority from the chinese patent application entitled "cleaning apparatus" with application number 202110465137.4, filed by the chinese patent office on 28/04/2021, the contents of which are incorporated herein by reference.

Technical Field

The utility model belongs to the technical field of it is clean, concretely relates to cleaning equipment.

Background

Cleaning devices, such as floor washers, have been increasingly used for cleaning household floors, which have many advantages such as saving labor and good cleaning effect. A scrubber generally includes a floor brush assembly, a body assembly, and a pump assembly. Wherein the floor brush assembly is suitable for cleaning on a surface to be cleaned; the machine body assembly comprises a main motor, wherein the main motor is suitable for generating negative pressure so that dirt on a surface to be cleaned can be cleaned under the cleaning action of the floor brush assembly; the water pump assembly is communicated with the floor brush assembly to deliver the cleaning solution to the floor brush assembly.

In the prior art, a water pump assembly is generally installed in a floor brush assembly, so that the overall size of the floor brush assembly is increased, the trafficability of the floor brush in a complex cleaning scene is affected, for example, the floor brush is difficult to enter the bottom of a narrow sofa for cleaning, the cleaning efficiency of cleaning equipment is affected, and the overall attractiveness of the cleaning equipment is affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses the technical problem that solve is how to improve cleaning device's cleaning efficiency and the holistic pleasing to the eye degree of cleaning device.

In order to solve the technical problem, the utility model provides a cleaning device, include:

the floor brush assembly is suitable for cleaning a surface to be cleaned;

the machine body assembly is connected with the floor brush assembly and is suitable for generating negative pressure so that dirt on the surface to be cleaned can enter the floor brush assembly; and

a liquid delivery assembly at least partially in communication with the floor brush assembly;

the liquid conveying assembly comprises a pump body, the direction of the ground brush assembly is the front, and the pump body is located at one end, close to the ground brush assembly, of the machine body assembly and arranged in front of the center line of the machine body assembly.

Optionally, in the above cleaning apparatus, the body assembly includes a liquid storage member adapted to store liquid;

in the height direction of the machine body assembly, the pump body is located below the liquid storage part.

Optionally, in the above cleaning apparatus, the liquid storage part includes a recycling tank and a supply tank;

the recycling box and the supply box are arranged oppositely, the recycling box is arranged towards the floor brush assembly, and the supply box is arranged opposite to the floor brush assembly;

the pump body is located below the recovery box.

Optionally, in the above cleaning apparatus, the liquid storage part includes a supply tank disposed toward the floor brush assembly;

the pump body is located below the supply tank.

Optionally, in the cleaning apparatus described above, the main motor is disposed adjacent to the floor brush assembly and is in communication with the floor brush assembly through an airflow channel;

the pump body is located in front of the airflow channel.

Optionally, in the above cleaning apparatus, the floor brush assembly includes:

a housing;

the rolling brush is rotationally connected with the shell; and

and the driving piece is connected with the rolling brush to drive the rolling brush to rotate.

Optionally, in the above cleaning apparatus, there is one roller brush;

the driving piece is arranged in the rolling brush; or the driving piece is arranged on one side of the rolling brush.

Optionally, in the cleaning apparatus described above, at least two rolling brushes are provided, and the number of the driving members corresponds to the number of the rolling brushes;

each rolling brush is provided with an accommodating cavity, and the driving pieces are arranged in the accommodating cavities respectively so as to drive the rolling brushes to rotate respectively.

Optionally, in the cleaning apparatus described above, the ground brush assembly has a central axis, and the central axis is perpendicular to a connecting line between the centers of the two rolling brushes;

the pump body is located above the central axis.

Optionally, in the above cleaning apparatus, the housing further has two suction openings formed therein, and the two suction openings are located between at least two of the rolling brushes.

The utility model provides a technical scheme has following advantage: the pump body is arranged on the machine body, so that the installation space of the floor brush assembly is saved, the overall volume of the floor brush assembly is reduced, the effect of improving the trafficability of the floor brush assembly in a complex cleaning scene is achieved, the cleaning efficiency of the cleaning equipment is improved, and the overall attractiveness of the cleaning equipment is ensured; simultaneously, the pump body is located the fuselage subassembly and is close to the one end of scrubbing brush subassembly, and is located the place ahead of fuselage subassembly to make cleaning device's focus lower, the user of being convenient for application of force in the use improves user and uses experience.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the cleaning apparatus of the present invention;

FIG. 2 is another schematic view of the cleaning apparatus of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

fig. 4 is a cross-sectional view of another structure of the cleaning device of the present invention.

Description of the reference numerals:

1-a floor brush assembly; 11-a housing; 111-a body; 112-window upper cover; 12-rolling brush; 13-a dust box;

2-a fuselage assembly; 21-liquid storage part; 211-supply tank; 212-a recovery tank; 22-a main motor; 23-a rod body; 24-a handle;

3-a liquid delivery assembly; 31-a pump body; 32-conveying pipeline.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

Example 1

Referring to fig. 1 to 4, the cleaning apparatus provided in this embodiment is suitable for cleaning a surface to be cleaned of a target to be cleaned. The target to be cleaned can be the ground, the wall surface or the dirty surface of other objects, and the application target or the application scene of the cleaning equipment is not specifically limited by the application method.

It should be noted that the cleaning device of the present application has both the suction function and the mopping function, and the suction function and the mopping function can be activated simultaneously, or operated step by step according to actual requirements, or operated independently. Wherein the suction function can be a dust suction function and/or a water suction function.

Taking a hand-held floor washing machine as an example, the cleaning device comprises a cleaning head, a rod body 23 and a handle 24 which are connected in sequence, namely the cleaning head and the handle 24 are respectively arranged at two sides of the rod body 23. The cleaning head may be referred to as a floor brush unit 1, and hereinafter, the cleaning head may be referred to as a floor brush unit 1.

The user can manipulate the handle 24 to manipulate the direction of movement of the cleaning device. In addition, in order to facilitate the use of the user, the function switch and the on-off switch of the cleaning device can also be arranged on the handle 24, so that the user does not need to bend down to operate. The functional switch and the on-off switch can be integrated, and the on-off of the floor washing machine or the selection of functions can be distinguished through the difference of the pressing force or the pressing times; or, the function switch and the on-off switch are independently arranged, so that the user can conveniently identify and operate the switch, and the switch is determined according to actual conditions and is not specifically limited.

Regarding the state of the user using the cleaning device, at this time, one side of the rod 23 facing the human body is defined as a rear end, one side of the rod 23 away from the human body is defined as a front end, and the handle 24 is disposed at the front end of the rod 23 and at the upper end of the rod 23. The purpose of this is to: the force applied by the user to the handle 24 is resolved into a horizontal force, which is disposed parallel to the ground, and a vertical force, which is disposed perpendicular to the ground. When the handle 24 is arranged at the front end of the rod body 23, a first included angle exists between the rod body 23 and the ground when a user uses the cleaning device; when the handle 24 is disposed at the rear end of the rod 23, a second included angle exists between the rod 23 and the ground when the user uses the cleaning device, and the first included angle is smaller than the second included angle. When the angle between the rod 23 and the ground is smaller, the vertical force is smaller, i.e. the force applied to the handle 24 by the user is smaller, so as to achieve the purpose of saving labor.

The handle 24 may be linear or curved, and is not particularly limited and may be any handle as long as it is practical. In the present embodiment, the handle 24 is curved, and specifically, the handle 24 is ring-shaped to fit the shape of a human hand. The two ends of the ring-shaped handle 24 are connected to the rod 23, respectively, to prevent the user from slipping off during the operation of the handle 24. More specifically, anti-slip means may also be provided on the handle 24 to enhance the friction between the handle 24 and the human hand. The anti-slip member may be a protrusion protruding outward from the surface of the handle 24 or a groove recessed inward from the surface of the handle 24, or may be a rubber or the like adhered or sleeved on the handle 24.

The floor brush assembly 1 is disposed adjacent to the bottom end of the rod 23, and the floor brush assembly 1 is configured to move over a surface to be cleaned to clean the surface to be cleaned. Specifically, the cleaning head includes a housing 11, a rolling brush 12 disposed in the housing 11, and a driving member connected to the rolling brush 12 for driving the rolling brush 12 to rotate, wherein the driving member may be directly connected to the rolling brush 12 or may be connected to the rolling brush 12 through a transmission member.

When the driving part is directly connected with the rolling brush 12, the occupied space of the driving part and the rolling brush 12 can be reduced, and the arrangement of each device in the machine shell is convenient, so that the whole floor brush assembly 1 is more compact; when the driving member is connected to the rolling brush 12 through a transmission member, the driving member can be disposed at the rear side of the rolling brush 12, and the overall width of the floor brush assembly 1 can be reduced. In this case, the transmission member may be a belt transmission or the like, and is not particularly limited herein, depending on the actual situation. In this embodiment, the roller brush 12 is directly connected to the driving member in order to make the floor brush assembly 1 more compact.

More specifically, this driving piece is driving motor, and driving motor and round brush 12 coaxial setting to when avoiding driving motor drive round brush 12 to rotate, the condition of round brush 12 luffing motion takes place, thereby improves clean efficiency.

There are two coaxial arrangements, one is that the driving member is arranged at one side of the rolling brush 1232, which does not increase the width of the floor brush assembly 1, but increases the length of the floor brush assembly 1. In order to ensure the passage of the floor brush assembly 1 in complex cleaning scenarios, for example through narrow spaces, the drive element is arranged in the roller brush 12. At this time, the length of the floor brush assembly 1 is unchanged, and the width of the floor brush assembly 1 is reduced, so that the aim of enabling the overall structure of the floor brush assembly 1 to be more compact is fulfilled. Therefore, in the present embodiment, the driving member is provided inside the roll brush 12. The roller brush 12 has a receiving chamber in which the drive element is arranged.

A housing groove is formed in the front side of the housing 11, and the driving member and the roll brush 12 are disposed in the housing groove. In order to facilitate subsequent cleaning and replacement of the roller brush 12, one end of the driving member is connected to the housing 11, and the roller brush 12 is detachably connected to the driving member. The purpose of this is to: only one end of the driving member is connected with the housing 11, so that when the rolling brush 12 and the driving member are mounted and dismounted, the driving member can swing relative to the housing 11, and the driving member is conveniently mounted in cooperation with the rolling brush 12. The specific process is as follows: when the rolling brush 12 and the driving member are mounted and dismounted, an external force is applied to the other end of the driving member to lift the driving member, then the accommodating cavity of the rolling brush 12 is aligned with the driving member, and the rolling brush 12 is driven to move towards the driving member, so that the driving member is completely accommodated in the accommodating cavity. The roll brush 12 is then pressed down so that the other end of the roll brush 12 is mounted in alignment with the housing 11, thereby achieving mounting of the roll brush 12 to the housing 11.

The housing 11 includes a body 111 and a window cover 112 disposed above the roller brush 12, and the window cover 112 is detachably connected to the body 111. That is, the window upper cover 112 is disposed above the receiving groove to shield at least a portion of the rolling brush 12, so as to prevent the dirt carried by the rotation of the rolling brush 12 from being splashed onto the user under the action of centrifugal force during the cleaning process. When the rolling brush 12 is required to be detachably connected with the housing 11, the window upper cover 112 is required to be detachably connected with the body 111.

The upper cover 112 of the window and the body 111 can be detachably connected in a clamping manner, a magnetic attraction manner, a fastening piece manner and the like, and the window is convenient and quick. When the window upper cover 112 is connected with the body 111 in a clamping way, the window upper cover can be connected with the body in a protruding and notch way; when the window upper cover 112 and the body 111 are magnetically attracted, the window upper cover can be attracted by two magnets or by one magnet and the other magnet being magnetic metal; when the window upper cover 112 is connected with the body 111 by a fastener, the window upper cover 112 and the body 111 can be provided with holes matched with the fastener. In other embodiments, the window upper cover 112 and the body 111 can be detachably clamped, overlapped, and the like, which is not specifically limited herein, but is limited according to actual requirements, so that the window upper cover 112 does not fall off during the operation of the cleaning device.

Alternatively, in other embodiments, a side portion of the body 111 can be detachably connected to the body 111, and in this case, the window cover 112 can be detachably connected to the body 111 or fixedly connected to the body. Specifically, when the rolling brush 12 and the driving element are required to be detachably connected, the side part and the body 111 are detached, so that the accommodating cavity of the rolling brush 12 is directly aligned with the driving element, the driving element is accommodated in the accommodating cavity under the action of external force, then the side part and the body 111 are installed, the rolling brush 12 and the body 111 are rotatably connected, and no specific limitation is made herein, which is determined according to actual conditions. The detachable connection between the side portion and the main body 111 is the same as above, and is not described herein.

The cleaning device further comprises a dust box 13 for storing dirt, wherein the dust box 13 can be disposed on the body assembly 2 or disposed on the floor brush assembly 1, which is a conventional technology and is not described herein. In the present embodiment, the dust box 13 is disposed on the floor brush assembly 1 at the rear side of the roller brush 12 and communicates with the body assembly 2.

In order to further improve the cleaning efficiency of the cleaning device so that the cleaning device can keep continuously clean, the cleaning device further comprises a body assembly 2 and a liquid delivery assembly 3. The body assembly 2 is connected with the floor brush assembly 1 and is adapted to generate a negative pressure so that dirt on a surface to be cleaned can enter the floor brush assembly 1. And the liquid conveying assembly 3 is at least partially communicated with the floor brush assembly 1 to convey the cleaning liquid to the roller brush 12 of the floor brush assembly 1 to wet the roller brush 12, so that the cleaning efficiency of the cleaning device is improved.

Wherein the liquid delivery assembly 3 comprises a pump body 31. In order to ensure the passability of the floor brush assembly 1 without increasing the overall volume of the floor brush assembly 1. In the present embodiment, the pump body 31 is provided on the body assembly 2.

Furthermore, in order to facilitate the user operation and prevent the overall gravity center of the cleaning device from being backward, so that the cleaning device cannot be kept upright when not in use, in this embodiment, the direction of the floor brush assembly 1 is taken as the front, and the pump body 31 is located at one end of the body assembly 2 close to the floor brush assembly 1 and is disposed in front of the center line of the body assembly 2. Through the arrangement, the integral gravity center of the cleaning equipment is ensured to be positioned at the lower end, and the stability is ensured; meanwhile, the comfort level of the user in the operation process is improved.

As mentioned above, the cleaning device further comprises a rod 23, and the rod 23 is connected with the floor brush assembly 1. Accordingly, the body component 2 is arranged on the rod 23.

In one embodiment, the body assembly 2 connects the rod 23 and the floor brush assembly 1. At this time, the center line of the body assembly 2 and the center line of the lever 23 are disposed to coincide for the user's convenience. In this embodiment, the body assembly 2 includes a main motor 22 adapted to generate a negative pressure, the main motor 22 communicating with the floor brush assembly 1 through an airflow channel.

The main motor 22 is disposed close to the floor brush assembly 1 to shorten the length of the air flow channel, so that the main motor 22 can form a strong negative pressure in the floor brush assembly 1 through the air flow channel, thereby improving the cleaning efficiency of the cleaning device. In this embodiment, the pump body 31 is located in front of the airflow passage. That is, the pump body 31 is located below the main motor 22 and in front of the airflow passage. The purpose of placing the pump body 31 close to the air flow channel is to: the pump body 31 generates heat during operation, and the air flow generated by the main motor 22 through the air flow channel can dissipate heat of the pump body 31, thereby prolonging the service life of the pump body 31. And, through the heat dissipation of airflow channel's cold airflow, the heat that pump body 31 operation produced only can transmit to fuselage subassembly 2's shell less on, even the user mistake touches this department shell, can not cause scald or the sensation of scorching hot to the user yet, improves user experience.

In this embodiment, the pump body 31 may be connected to an external water source and the floor brush assembly 1 through the delivery pipe 32, or the cleaning device further includes a clean water tank, and the pump body 31 may be connected to the clean water tank and the floor brush assembly 1 through the delivery pipe 32, which is not particularly limited herein, depending on the actual situation. Wherein the delivery duct 32 is connected to a nozzle of the floor brush assembly 1, which is arranged towards the roller brush 12. When the pump body 31 operates to deliver a water supply to the nozzle through the delivery pipe 32, the nozzle sprays liquid toward the roll brush 12 to wet the roll brush 12.

In another embodiment, the body element 2 is disposed on the rod 23, and at least a portion of the body element 2 is in communication with the rod 23. At this point, the body assembly 2 includes a reservoir 21, the reservoir 21 being adapted to hold a liquid. The pump body 31 is located below the liquid storage member 21 in the height direction of the body unit 2.

In one case, the reservoir 21 includes a recovery tank 212 and a supply tank 211. Wherein, the recycling tank 212 is suitable for storing sewage, the supply tank 211 is suitable for storing detergent, and the pump body 31 is communicated with the supply tank 211 and the scrubbing brush assembly 1 through the delivery pipe 32, and the specific structure is the same as above, and will not be described herein.

The recycling bin 212 and the supply bin 211 are arranged opposite to each other, the recycling bin 212 is arranged towards the floor brush assembly 1, and the supply bin 211 is arranged opposite to the floor brush assembly 1. The purpose of this is to: the recovery tank 212 and the clean water tank are disposed on the rod 23 to reduce the overall volume of the floor brush assembly 1. Simultaneously, both back of the body setting in order to reduce the holistic focus of cleaning device, the user operation of being convenient for.

In this embodiment, the pump body 31 is located below the recovery tank 212. The liquid in the recovery tank 212 can cool the pump body 31 which generates heat in operation, and meanwhile, the distance between the supply tank 211 and the pump body 31 is short, so that the conveying path of the cleaning agent is reduced, the waste of the cleaning agent is reduced, and the conveying time of the cleaning agent is saved.

In another case, the reservoir 21 includes a supply tank 211, the supply tank 211 being disposed toward the floor brush assembly 1. At this time, the pump body 31 is located below the supply tank 211, and the purpose of this arrangement is the same as the above: the liquid in the supply tank 211 cools the pump body 31 which generates heat during operation, and the distance between the supply tank 211 and the pump body 31 is short, so that the conveying path of the cleaning agent is reduced, the waste of the cleaning agent is reduced, and the conveying time of the cleaning agent is saved.

In this embodiment, the airframe assembly 2 also includes a main motor 22. In both cases, the main motor 22 is disposed above the supply tank 211 or the recovery tank 212. Also, in this embodiment, the portion of the shaft body 23 disposed near the floor brush assembly 1 is hollow to serve as an air flow passage for communicating the floor brush assembly 1 and the main motor 22.

As mentioned above, the floor brush assembly 1 comprises a housing 11, a roller brush 12 and a driving member. In one embodiment, there is one rolling brush 12, and the connection between the driving member and the rolling brush 12 is the same as that described above, which is not described herein.

In another embodiment, at least two rolling brushes 12 are provided, and the number of the driving members corresponds to the number of the rolling brushes 12. In order to ensure the passability of the floor brush assembly 1 and to minimize the overall volume of the floor brush assembly 1, in this embodiment, each of the rolling brushes 12 has a receiving chamber, and a driving member is respectively disposed in the receiving chambers to respectively drive the rolling brushes 12 to rotate. Also, in order to secure the cleaning efficiency of the cleaning apparatus, two suction ports are formed in the housing 11 between the at least two rolling brushes 12.

In this embodiment, the floor brush assembly 1 has a central axis which is perpendicular to a line connecting the centers of the two roll brushes 12. The pump body is located above the central axis to balance the overall center of gravity of the cleaning device, so that the cleaning device can be kept upright when not in use.

In summary, the following steps: the pump body 31 is arranged on the machine body, so that the installation space of the floor brush assembly 1 is saved, the overall volume of the floor brush assembly 1 is reduced, the effect of improving the trafficability of the floor brush assembly 1 in a complex cleaning scene is achieved, the cleaning efficiency of the cleaning equipment is improved, and the overall attractiveness of the cleaning equipment is ensured; simultaneously, the pump body 31 is located the fuselage subassembly 2 and is close to the one end of scrubbing brush subassembly 1, and is located the place ahead of fuselage subassembly 2 to make cleaning device's focus lower, the user of being convenient for application of force in the use improves user and uses experience.

It is to be understood that the above-described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, a person skilled in the art can make changes or changes in other different forms without creative work, and all should belong to the protection scope of the present invention.

Claims

1. A cleaning apparatus, comprising:

the floor brush assembly is suitable for cleaning a surface to be cleaned;

2. The cleaning apparatus defined in claim 1, wherein the body assembly comprises a reservoir adapted to store liquid;

3. The cleaning apparatus defined in claim 2, wherein the reservoir comprises a recovery tank and a supply tank;

the recycling box and the supply box are arranged oppositely, the recycling box is arranged towards the floor brush assembly, and the supply box is arranged oppositely to the floor brush assembly;

the pump body is located below the recovery tank.

4. The cleaning apparatus defined in claim 2, wherein the reservoir comprises a supply tank disposed toward the floor brush assembly;

the pump body is located below the supply tank.

5. The cleaning apparatus defined in claim 1, wherein the body assembly comprises a main motor adapted to generate a negative pressure, the main motor being disposed adjacent the floor brush assembly and in communication with the floor brush assembly via an airflow passage;

the pump body is located in front of the airflow channel.

6. The cleaning apparatus defined in any one of claims 1-5, wherein the floor brush assembly comprises:

a housing;

the rolling brush is rotationally connected with the shell; and

7. The cleaning apparatus as claimed in claim 6, wherein the roll brush is provided with one;

8. The cleaning apparatus as claimed in claim 6, wherein at least two of said rolling brushes are provided, and the number of said driving members corresponds to the number of said rolling brushes;

every the round brush has the holding chamber, the driving piece sets up respectively the holding intracavity is in order to drive respectively the round brush rotates.

9. The cleaning apparatus as claimed in claim 8, wherein the floor brush assembly has a central axis perpendicular to a line connecting centers of the two roll brushes;

the pump body is located above the central axis.

10. A cleaning appliance according to claim 8, wherein the housing is further formed with two suction openings, two of said suction openings being located between at least two of said rolling brushes.