Floor brush assembly and vacuum cleaner

Abstract

The present invention discloses a floor brush assembly, including a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are sequentially arranged from front to back; the floor brush assembly is constructed to have a first working state and a second working state adapted to different surfaces to be cleaned; in the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned; in the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; the difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one fiftieth of the radius of the rear roller brush. The present invention can not only reduce the motor cost of the rear roller brush, but also ensure the airtightness near the suction port. The present invention also discloses a vacuum cleaner.

Description

Technical Field

[0001] The present invention relates to a floor brush assembly, in particular to a floor brush assembly with double roller brushes. The present invention also relates to a vacuum cleaner comprising the floor brush assembly. Background Art

[0002] The common double-roller floor brushes on the market often do not have a function to adjust to the changes in the working environment (floor / carpet) to achieve a better dust absorption effect. In addition, compared with the single-roller structure, the double-roller floor brush has a higher load when working on the carpet. The conventional method is to increase the motor model to provide higher torque, which makes their floor brushes have certain limitations and causes an increase in cost. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a floor brush assembly and a vacuum cleaner in which the ground clearance of the rear roller brush remains basically unchanged when working in different working environments.

[0004] In order to solve the above technical problems, the present invention discloses a floor brush assembly, including a floor brush body, on which a front supporting wheel, a front roller brush, a rear roller brush and a rear supporting wheel are arranged in sequence from front to rear; the floor brush assembly is constructed to have a first working state and a second working state that are adapted to different surfaces to be cleaned; in the first working state, the front supporting wheel and the rear supporting wheel in a high position are supported on the surface of the first surface to be cleaned; in the second working state, the front supporting wheel is sunk into the second surface to be cleaned, and the rear supporting wheel in a low position is supported on the surface of the second surface to be cleaned; the difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one fiftieth of the radius of the rear roller brush.

[0005] As a specific embodiment of the present invention, preferably, the difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one hundredth of the radius of the rear roller brush.

[0006] As a specific embodiment of the present invention, preferably, the difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one hundred and fiftieth of the radius of the rear roller brush.

[0007] As a specific embodiment of the present invention, preferably, the difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one two hundredth of the radius of the rear roller brush.

[0008] As a specific embodiment of the present invention, preferably, in the first working state, the surface of the first surface to be cleaned is tangent to the front supporting wheel and the rear supporting wheel respectively.

[0009] As a specific embodiment of the present invention, preferably, in the first working state, the distance between the lowest point of the front roller brush and the surface of the first surface to be cleaned is greater than the distance between the lowest point of the rear roller brush and the surface of the first surface to be cleaned.

[0010] As a specific embodiment of the present invention, preferably, the width of the front support wheel is smaller than the width of the rear support wheel.

[0011] The present invention also discloses a floor brush assembly, comprising a floor brush body, on which a front supporting wheel, a front roller brush, a rear roller brush and a rear supporting wheel are arranged in sequence from front to back; the floor brush assembly is constructed to have a first working state and a second working state adapted to different surfaces to be cleaned; in the first working state, the front supporting wheel and the rear supporting wheel in a high position are supported on the surface of the first surface to be cleaned, and there is a lowest point Ph on the rear roller; in the second working state, the front supporting wheel is sunk into the second surface to be cleaned, and the rear supporting wheel in a low position is supported on the surface of the second surface to be cleaned, and there is a lowest point Ps on the rear roller brush; the distance between the point Ph and the point Ps is not greater than the radius of the rear roller brush.

[0012] As a specific embodiment of the present invention, preferably, the distance between the point Ph and the point Ps is not greater than half of the radius of the rear roller brush.

[0013] As a specific embodiment of the present invention, preferably, the distance between the point Ph and the point Ps is not greater than one quarter of the radius of the rear roller brush.

[0014] As a specific embodiment of the present invention, preferably, the distance between the point Ph and the point Ps is not greater than one eighth of the radius of the rear roller brush.

[0015] As a specific implementation of the present invention, preferably, the distance between the point Ph and the point Ps is not greater than one tenth of the radius of the rear roller brush.

[0016] The present invention also discloses a floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are arranged in sequence from front to back; the characteristic is that the floor brush assembly is constructed to have a first working state and a second working state adapted to different surfaces to be cleaned; in the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned, and there is a lowest point Ph on the rear roller brush; in the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; the side surface of the floor brush assembly is projected onto a reference plane to make a first reference line and a second reference line, the first reference line and the second reference line are compared with point Pi, and a perpendicular line L to the first reference line hh is made through point Pi, and the distance from point Ph to the perpendicular line L is not greater than the radius of the rear roller brush.

[0017] As a specific embodiment of the present invention, preferably, the distance from the point Ph to the vertical line L is not greater than half of the radius of the rear roller brush.

[0018] As a specific embodiment of the present invention, preferably, the distance from the point Ph to the vertical line L is not greater than one fifth of the radius of the rear roller brush.

[0019] As a specific implementation of the present invention, preferably, the distance from the point Ph to the vertical line L is zero.

[0020] The present invention also discloses a floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are sequentially arranged from front to rear; the characteristic is that the floor brush assembly is constructed to have a first working state and a second working state adapted to different surfaces to be cleaned; in the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned; in the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; the side surface of the floor brush assembly is projected onto a reference plane to make a first reference line and a second reference line, the first reference line and the second reference line intersecting at a point Pi; a perpendicular line L to the first reference line is made through the point Pi, and a perpendicular line T to the first reference line is made through the rotation axis of the rear roller brush; the distance between the perpendicular line L and the perpendicular line T is not greater than the radius of the rear roller brush; wherein, the first reference line is the projection of the first surface to be cleaned on the reference plane in the first working state, and the second reference line is the projection of the second surface to be cleaned on the reference plane in the second working state.

[0021] As a specific embodiment of the present invention, preferably, the distance between the vertical line L and the vertical line T is not greater than half of the radius of the rear roller brush.

[0022] As a specific embodiment of the present invention, preferably, the distance between the vertical line L and the vertical line T is not greater than one fifth of the radius of the rear roller brush.

[0023] As a specific embodiment of the present invention, preferably, the distance between the vertical line L and the vertical line T is zero.

[0024] The present invention also discloses a vacuum cleaner including the above-mentioned floor brush assembly.

[0025] The floor brush assembly and vacuum cleaner using the technical solution of the present invention can ensure that the load of the rear roller brush remains basically unchanged when cleaning hard floors and soft floors, which can not only reduce the motor cost of the rear roller brush, but also ensure the air tightness near the suction port. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a floor brush assembly in the first embodiment of the present invention, wherein the floor brush assembly is in a first working state.

[0027] Figure 2 Schematic diagram of the floor brush assembly in the first embodiment of the present invention, wherein the floor brush assembly wheel is in the second working state.

[0028] Figure 3 2 is an exploded view of the floor brush assembly in the second embodiment of the present invention.

[0029] Figure 4 4 is a bottom view of a floor brush assembly in a second embodiment of the present invention.

[0030] Figure 5 The floor brush assembly in the second embodiment of the present invention is Figure 4 A cross-sectional view of AA in the figure, wherein a represents the floor brush assembly in the first working state, and b represents the floor brush assembly in the second working state.

[0031] Figure 6 The floor brush assembly in the second embodiment of the present invention is Figure 4 A cross-sectional view taken along line AA in the figure shows the floor brush assembly in a first working state and a second working state in a superimposed manner.

[0032] Figure 7 The floor brush assembly in the second embodiment of the present invention is Figure 4 Cross-sectional view of BB.

[0033] Figure 8 Schematic diagram of the rear support wheel assembly in the second embodiment of the present invention.

[0034] Fig. 9 The rear support wheel assembly in the second embodiment of the present invention is Figure 8 Cross-sectional view of CC.

[0035] Fig.10Schematic diagram of a floor brush assembly in the third embodiment of the present invention.

[0036] Fig.11 4 is a top view of a floor brush assembly in a third embodiment of the present invention.

[0037] Fig.12 It is an exploded view of the height adjuster of the rear supporting wheel of the floor brush assembly in the third embodiment of the present invention.

[0038] Fig.13 yes Fig.11 Cross-sectional view along CC, with the rear support wheel remaining in a high position.

[0039] Fig.14 yes Fig.11 Cross-sectional view along CC, with the rear support wheel remaining in a high position.

[0040] Fig.15 yes Fig.11 Cross-sectional view along the center line CC, with the rear support wheel in the low position.

[0041] Fig.16 yes Fig.11 Cross-sectional view along the center line CC, with the rear support wheel in the low position.

[0042] Fig.17 yes Fig.11 Cross-sectional view along the middle line CC, with the rear support wheel in the high position.

[0043] Fig.18 yes Fig.11 Cross-sectional view along the middle line CC, with the rear support wheel in the high position. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0045] It should be understood that in the description of the specific embodiments of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0046] In the specific implementation of the present invention, unless otherwise clearly specified and limited, the terms such as "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a movable connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In a specific embodiment of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them.

[0048] In the specific embodiments of the present invention, unless otherwise clearly specified and limited, the term "multiple" refers to two or more.

[0049] To facilitate description of the specific embodiments of the present invention, the same reference numerals are used for the same or similar structures or functions in different embodiments.

[0050] The first embodiment of the present invention discloses a floor brush assembly 9, including a floor brush body 902, wherein the floor brush body 902 includes a front support wheel 92, a front roller brush 96, a rear roller brush 98, and a rear support wheel 94 arranged in sequence from front to rear. The radius of the front support wheel 92 is r2, the radius of the front roller brush 96 is r6, the radius of the rear roller brush 98 is r8, and the radius of the rear support wheel is r4. The floor brush assembly 9 is constructed to have a first working state and a second working state adapted to different surfaces G to be cleaned.

[0051] In the first working state, if Figure 1 As shown, the floor brush assembly 9 is supported on a hard surface Gh. Specifically, the front support wheel 92 and the rear support wheel 94h are supported on the surface of the hard surface Gh, that is, the surface of the hard surface Gh is tangent to the front support wheel 92 and the rear support wheel 94h respectively; the distance between the lowest point of the front roller brush 96 and the surface of the hard surface Gh is d 61 The distance between the lowest point of the rear roller brush 98 and the surface of the hard surface Gh is d 81 ; where d 61 >d 81 , d 81It can be a positive number, zero or negative number. If the distance between the roller brush and the ground is a positive number, it means that the distance between the roller brush's rotation axis and the ground is greater than the roller brush's radius; if the distance between the roller brush and the ground is zero, it means that the distance between the roller brush's rotation axis and the ground is equal to the roller brush's radius; if the distance between the roller brush and the ground is a negative number, it means that the distance between the roller brush's rotation axis and the ground is less than the roller brush's radius, and the bristles of the roller brush are bent by force. In this embodiment, d 81 Usually zero or a negative number. In the present application, the radius of the roller brush refers to the maximum radius of the roller brush as a whole when the bristles of the roller brush are not bent under force. The hard surface Gh refers to the hard surface Gh that will not undergo obvious deformation when the floor brush assembly 9 is supported thereon, such as wooden floors, concrete floors, tile / slate paved floors, epoxy resin floors, solid and flat earth floors, etc. Figure 2 The hard surface Gh and the rear support wheel 94h supported on the hard surface Gh in the first working state are shown by dotted lines.

[0052] In the second working state, if Figure 2 As shown, the floor brush assembly 9 is supported on a soft surface Gs. Specifically, the front support wheel 92 has a relatively small width, so it at least partially sinks into the soft surface Gs; the rear support wheel 94s has a relatively large width, so when it is supported on the soft surface Gs, it will basically not sink into the soft surface Gs, that is, the surface of the soft surface Gs is tangent to the rear support wheel 94s and intersects with the front support wheel 92 below the floor brush body 902; the distance between the lowest point of the front roller brush 96 and the surface of the soft surface Gs is d 62 The minimum distance between the lowest point of the rear roller brush 98 and the surface of the soft surface Gs is d 82 , where d 62 The soft surface Gs is a negative number. When the floor brush assembly 9 is supported thereon, the soft surface Gs will sink significantly, typically on a carpeted floor, a soft bedding surface, etc. The surface of the soft surface Gs refers to the surface of the soft surface Gs that is not deformed by force. Figure 1 The soft surface Gs and the rear support wheel 94s supported on the soft surface Gs in the second working state are shown by dotted lines.

[0053] In the first embodiment, the rear support wheel 94 is configured to be movable in a direction perpendicular to the surface G to be cleaned. Figure 1 , Figure 2 As shown, the rear support wheel 94 has a high position and a low position. Specifically, when the rear support wheel 94 is in the high position, the floor brush assembly 9 is in the first working state; when the rear support wheel 94 is in the low position, the floor brush assembly 9 is in the second working state.

[0054] In the first embodiment, the side of the floor brush assembly 9 is projected onto a reference plane (i.e., paper), and a first reference line hh is drawn between the front support wheel 92 and the rear support wheel 94h in a high position. The first reference line hh is the outer common tangent line located below the front support wheel 92 and the rear support wheel 94h in a high position. The first reference line hh is the hard surface Gh. In the same projection, a second reference line ss is drawn for the rear support wheel 94s in a low position, and the following conditions are satisfied: the second reference line ss intersects the front support wheel 92 and the rear roller brush 96, respectively, and the arc height of the arc on the front support wheel 96 below the second reference line is equal to d 62 The absolute value of the second reference line ss is tangent to the rear support wheel 94s in the low position, and the second reference line ss is the soft surface Gs.

[0055] When the floor brush assembly 9 is in the first working state, there is a lowest point Ph on the rear roller brush 98, and the distance from point Ph to the first reference line hh is less than the distance from any other point on the rear roller brush 98 to the first reference line hh. The distance from point Ph to the first reference line hh at this time is defined as H h When the floor brush assembly 9 is in the second working state, there is a lowest point Ps on the rear roller brush 98, and the distance from point Ps to the second reference line ss is less than the distance from any other point on the rear roller brush 98 to the second reference line ss. The distance from point Ps to the second reference line ss at this time is defined as H s When switching between the first working state and the second working state, the height floating value H of the floor brush body 902 relative to the surface to be cleaned G is equal to H h -H s The absolute value of . Preferably, More preferably, More preferably, More preferably, In the first embodiment,

[0056] The distance between Ph and Ps is defined as m. Preferably, m≤r8; further preferably, More preferably, More preferably, More preferably, In the first embodiment,

[0057] In the first embodiment, the first reference line hh intersects with the second reference line ss at point Pi, a perpendicular line L is drawn through point Pi to the first reference line hh, and the distance from point Ph to the perpendicular line L is defined as n. Preferably, n≤r8; further preferably, More preferably, In the first embodiment, n=0.

[0058] In the first embodiment, the first reference line hh intersects with the second reference line ss at point Pi, a perpendicular line L to the first reference line hh is made through point Pi, and a perpendicular line T to the first reference line hh is made through the rotation axis of the rear roller brush 98, and the distance between the perpendicular line L and the perpendicular line T is defined as q. Preferably, q≤r8; further preferably, More preferably, In the first embodiment, q=0.

[0059] In the first embodiment, a suction port is provided on the bottom surface of the floor brush body 902, and the suction port is arranged near the front roller brush 96 and the rear roller brush 98. Preferably, the suction port is arranged between the front roller brush 96 and the rear roller brush 98. The floor brush assembly 9 also includes a connecting body 904 extending upward from the floor brush body 902. The connecting body 904 is used to connect with components of a vacuum cleaner such as a hose and an extension rod, so that the vacuum generator in the vacuum cleaner is connected with the suction port fluid.

[0060] The second embodiment of the present invention discloses a floor brush assembly 9, such as Figure 3 to Figure 9 To simplify the description and facilitate understanding, only the parts of this embodiment that are different from the first embodiment are described below.

[0061] The bristles of the front roller brush 96 are hard and long, suitable for extending into, for example, a carpet in the second working state, rolling up and sucking out dirt hidden in the carpet fluff. In the first working state, the front roller brush 96 is configured to leave the hard floor to avoid damaging the hard floor. The bristles of the rear roller brush 98 are soft and suitable for cleaning the hard floor in the first working state.

[0062] In the second embodiment, it is preferred that Further preferably, q≤30mm.

[0063] In the second embodiment, the floor brush assembly 9 includes a rear support wheel assembly 940, and the rear support wheel assembly 940 includes a rear support wheel 94 and a height adjuster 942 connected to the rear support wheel 94. In this embodiment, the height adjuster 942 is configured as an eccentric device 9422, and the eccentric device 9422 is fixedly connected to one end of the rear support wheel shaft 9402 away from the rear support wheel 94, and the rotation axis xx of the rear support wheel 94 is parallel to the rotation axis yy of the eccentric device 9422 and is not colinear. Specifically, the eccentric device 9422 is configured as a cylinder, and the rear support wheel shaft 9402 is fixedly connected to one end face of the cylinder. A groove 9426 is provided on the other end face of the cylinder, and the height adjustment of the rear support wheel can be completed by using a suitable tool to engage with the groove 9426 and rotate the cylinder. Corresponding to the eccentric device 9422, a limiting portion 9424 for accommodating the eccentric device 9422 is provided on the floor brush body 902. The limiting portion 9424 includes a cavity with a circular arc wall and a diameter matching the eccentric device 9422. The eccentric device 9422 is restricted from rotating in the cavity.

[0064] The third embodiment of the present invention discloses a floor brush assembly 9, such as Figures 10 to 18 The floor brush assembly 9 includes a floor brush body 902 formed by buckling an upper shell 9022 and a lower shell 9024. The floor brush body 902 includes a front support wheel 92, a front roller brush 96, a rear roller brush 98 and a rear support wheel 94 arranged in sequence from front to rear. In this embodiment, the front support wheel 92, the front roller brush 96 and the rear roller brush 98 are basically the same as those in the second embodiment described above, so they are not repeated in this embodiment. Figures 10 to 18 The floor brush assembly 9 also includes a connecting body 904 extending upward from the floor brush body 902 , and the connecting body 904 is approximately located in the middle of the rear of the floor brush body 902 .

[0065] The floor brush body 902 extends a first side portion 72 and a second side portion 74 backward from the rear portion thereof. The first side portion 72 and the second side portion 74 are respectively located on the left and right sides of the connecting body 904. In this embodiment, the first side portion 72 is located on the left side of the connecting body 904, and the second side portion 74 is located on the right side of the connecting body 904. The left rear support wheel 94 is arranged on the first side portion 72, and the right rear support wheel 94 is arranged on the second side portion 74.

[0066] In this embodiment, the floor brush assembly 9 further includes a height adjuster 942 connected to the rear support wheel 94. The height adjuster 942 includes a first side fitting 762, a second side fitting 764 and a connecting rod 760, wherein the first side fitting 762 is located in the housing of the first side portion 72, and the second side fitting 764 is located in the housing of the second side portion 74. The connecting rod 760 is generally U-shaped, having a connecting rod transverse portion 760a and a connecting rod longitudinal portion 760b arranged substantially in parallel, wherein the connecting rod longitudinal portion 760b extends backward from both ends of the connecting rod transverse portion 760a, and the rear free ends of the two connecting rod longitudinal portions 760b are respectively fixedly connected to the first side fitting 762 and the second side fitting 764. The first side fitting 762 and the second side fitting 764 are connected together by the connecting rod 760, and when one of the two is subjected to force and moves, the connecting rod 760 is driven to rotate around the connecting rod transverse portion 760a, thereby driving the other of the two to move.

[0067] The first side fitting member 762 includes a first side mounting hole 7622, ​​and the rear support wheel shaft 9402 of the left rear support wheel 94 is fixedly matched with the first side mounting hole 7622. The first side fitting member 762 also includes a first side fitting member protrusion 7624 extending backward. In this embodiment, the end of the first side fitting member protrusion 7624 is completely upward.

[0068] The second side fitting member 764 includes a second side mounting hole 7642, and the rear support wheel shaft 9402 of the right rear support wheel 94 is fixedly matched with the second side mounting hole 9642. The second side fitting member 764 also includes a second side fitting member protrusion 7644 extending from the rear. In this embodiment, the end of the second side fitting member protrusion 7644 is bent downward, and an arc surface is formed on its upper surface.

[0069] The height adjuster 942 also includes a first side operation key 722, a slider 78, a transverse spring 52 and a longitudinal spring 54a that cooperate with the first side fitting 762. The first side operation key 722 is pivotally connected to the upper housing 9022 through an operation key connecting shaft 722a, and the first side operation key 722 is at least partially exposed outside the housing of the floor brush body 902 for easy operation. The lower surface of the first side operation key 722 has a first operation key inclined surface 7222, and the first operation key inclined surface 7222 extends approximately from the upper front to the lower rear. The slider 78 includes a slider bottom 782 and a slider longitudinal portion 784, wherein the slider bottom 782 is approximately at right angles to the slider longitudinal portion 784, and the slider longitudinal portion 784 extends upward from the rear end of the slider bottom 782. The slider longitudinal portion 784 has a slider upper end 7846 and a slider inclined surface 7842. The slider inclined surface 7842 extends from the slider upper end 7846 toward the front and bottom and protrudes in front of the slider longitudinal portion 784. A slider recess 7844 is formed below the slider inclined surface 7842. Correspondingly, a first side support portion 9024a and a slide groove 9024c are formed at the first side portion 72 of the lower shell 9024. The first side support portion 9024a and the support portion at the corresponding position on the upper shell 9022 form an elongated hole located on the outer side surface (i.e., the left side surface) of the first side portion 72, which is used to constrain the first side fitting 762 to pivot therein and move in a generally up-and-down direction. The slide groove 9024c is used to accommodate the slider bottom 782 so that the slider bottom 782 can move in the front-and-back direction. The transverse spring 52 is arranged between the slider 78 and the rear wall of the slide groove 9024c, so that the slider 78 has a tendency to move forward. The longitudinal spring 54a is disposed between the first side fitting 762 and the bottom wall of the lower housing 9024, so that the first side fitting 762 has a tendency to move upward, even if the connecting rod 760 has a tendency to rotate upward around the connecting rod transverse portion 760a.

[0070] The height adjuster 942 also includes a second side operation key 742 and a longitudinal spring 54b that cooperate with the second side fitting member 764. The second side operation key 742 is pivotally connected to the upper housing 9022 through an operation key connecting shaft 742a, and the second side operation key 742 is at least partially exposed outside the housing of the floor brush body 902 for easy operation. The lower surface of the second side operation key 742 has a second operation key inclined surface 7422, and the second operation key inclined surface 7422 extends approximately from the front upper part to the rear lower part. The second side support portion 9024b is formed at the position of the second side portion 74 of the lower housing 9024, and the second side support portion 9024b and the support portion at the corresponding position on the upper housing 9022 form an elongated hole located on the outer side surface of the second side portion 74 (i.e., its right side surface) to constrain the second side fitting member 764 to pivot therein and move approximately in the up and down direction. The longitudinal spring 54b is disposed between the second side fitting 764 and the bottom wall of the lower shell 9024, so that the second side fitting 764 has a tendency to move upward, even if the connecting rod 760 has a tendency to rotate upward around the connecting rod transverse portion 760a.

[0071] Combine the following Figure 13 to Figure 18 , the working process of the height adjuster 942 in this embodiment is introduced.

[0072] Fig.13 and Fig.14 The floor brush assembly 9 is shown when the rear support wheel 94 is kept in a high position and the height adjuster 942 is not operated and kept in an unactivated state. At this time, the floor brush assembly 9 is in the first working state. For the first side portion 72, the transverse spring 52 and the longitudinal spring 54a are both in a non-compressed state, the slider 78 is located in a front position, the first side fitting member 762 is located in an upper position, and the first side operation key 722 is located in an upper position. The lower side of the first side fitting member protrusion 7624 cooperates with the front part of the slider slope 7842, and the lower end of the first operation key slope 7222 cooperates with the rear part of the slider slope 7842. For the second side portion 74, the longitudinal spring 54b is in a non-compressed state, and the second side fitting member 764 is located in an upper position. The second operation key slope 7422 cooperates with the upper surface of the second side fitting member protrusion 7644.

[0073] When it is necessary to switch the floor brush assembly 9 from the first working state to the second working state, press down (or step down with the foot) the second side operation key 742, such as Fig.15 and Fig.16 As shown, the second side operation key 742 rotates downward around the operation key connecting shaft 742b, and the second operation key inclined surface 7422 applies a downward force to the second side fitting member protrusion 7644, so that the second side fitting member 764 moves downward and compresses the longitudinal spring 54b. The downward movement of the second side fitting member 764 causes the connecting rod 760 to rotate downward around the connecting rod transverse portion 760a, thereby causing the first side fitting member to move downward and compress the longitudinal spring 54b. Due to the cooperation between the lower surface of the first side fitting member protrusion 7624 and the slider inclined surface 7842, during the downward movement of the first side fitting member 762, the slider 78 is first pushed backward and the transverse spring 52 is compressed at the same time, until the first side fitting member protrusion 7624 can move from the top of the slider inclined surface 7842 to the position of the slider recess 7844. When the first side fitting member protrusion 7624 moves to the position of the slider recess 7844, the slider 78 returns to the front position under the elastic force of the transverse spring 52 to restore its original state. At this time, due to the action of the slider recess 7844, the first side fitting 762 can be stably maintained in the lower position, and due to the action of the connecting rod 760, the second side fitting 764 can also be stably maintained in the lower position, that is, the rear support wheel 94 is stably maintained in a low position. At this time, the floor brush assembly 9 is in the second working state.

[0074] When it is necessary to switch the floor brush assembly 9 from the second working state to the first working state, press down (or step down with the foot) the first side operation key 722, such as Fig.17 and Fig.18 As shown, the first side operation key 722 rotates downward around the operation key connecting shaft 722a, the lower end of the first operation key inclined surface 7222 applies a downward force to the slider inclined surface 7842, and the slider 78 moves backward and compresses the transverse spring 52 until the constraint of the first side fitting concave portion 7844 on the first side fitting convex portion 7624 is released. At this time, the first side fitting 762 returns to the upper position under the elastic force of the longitudinal spring 54a and the second side fitting 764 returns to the original state under the elastic force of the longitudinal spring 54b. The downward force applied to the first side operation key 722 is cancelled, and the slider 78 returns to the front position under the elastic force of the transverse spring 52 returning to the original state. The first side operation key 722 returns to the upper position due to the left and right movement of the slider inclined surface 7842, and the second side operation key 742 also returns to the upper position due to the action of the second side fitting convex portion 7644. Correspondingly, in this process, the connecting rod 760 rotates upward around the connecting rod transverse portion 760a. At this time, the floor brush assembly 9 is stably maintained in the first working state.

[0075] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0076] The detailed description of a front-end series listed above is only a specific description of a feasible implementation mode of the present invention. They are not intended to limit the protection scope of the present invention. Any equivalent implementation mode or modification that does not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are arranged in sequence from front to rear; wherein: The floor brush assembly is configured to have a first working state and a second working state adapted to different surfaces to be cleaned; In the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned; In the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; The difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one fiftieth of the radius of the rear roller brush.

2. The floor brush assembly according to claim 1, characterized in that: The difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one hundredth of the radius of the rear roller brush.

3. The floor brush assembly according to claim 1, characterized in that: The difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one hundred and fiftieth of the radius of the rear roller brush.

4. The floor brush assembly according to claim 1, characterized in that: The difference between the distance between the rear roller brush and the surface of the first surface to be cleaned in the first working state and the distance between the rear roller brush and the surface of the second surface to be cleaned in the second working state is not greater than one two hundredth of the radius of the rear roller brush.

5. The floor brush assembly according to any one of claims 1 to 4, characterized in that: In the first working state, the surface of the first surface to be cleaned is tangent to the front supporting wheel and the rear supporting wheel respectively.

6. The floor brush body assembly according to any one of claims 1 to 4, characterized in that: In the first working state, the distance between the lowest point of the front roller brush and the surface of the first surface to be cleaned is greater than the distance between the lowest point of the rear roller brush and the surface of the first surface to be cleaned.

7. The floor brush assembly according to any one of claims 1 to 4, characterized in that: The width of the front support wheel is smaller than the width of the rear support wheel.

8. A floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are arranged in sequence from front to rear; wherein: The floor brush assembly is configured to have a first working state and a second working state adapted to different surfaces to be cleaned; In the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned, and there is a lowest point Ph on the rear roller; In the second working state, the front support wheel is sunk into the second surface to be cleaned, the rear support wheel in a low position is supported on the surface of the second surface to be cleaned, and there is a lowest point Ps on the rear roller brush; The distance between the point Ph and the point Ps is not greater than the radius of the rear roller brush.

9. The floor brush assembly according to claim 8, characterized in that: The distance between the point Ph and the point Ps is not greater than half of the radius of the rear roller brush.

10. The floor brush assembly according to claim 8, characterized in that: The distance between the point Ph and the point Ps is not greater than one quarter of the radius of the rear roller brush.

11. The floor brush assembly according to claim 8, characterized in that: The distance between the point Ph and the point Ps is not greater than one eighth of the radius of the rear roller brush.

12. The floor brush assembly according to claim 8, characterized in that: The distance between the point Ph and the point Ps is not greater than one tenth of the radius of the rear roller brush.

13. A floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are arranged in sequence from front to rear; wherein: The floor brush assembly is configured to have a first working state and a second working state adapted to different surfaces to be cleaned; In the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned, and there is a lowest point Ph on the rear roller brush; In the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; Project the side of the floor brush assembly onto a reference plane to make a first reference line and a second reference line. The first reference line and the second reference line are compared to point Pi, and a perpendicular line L to the first reference line hh is made through point Pi. The distance from point Ph to the perpendicular line L is not greater than the radius of the rear roller brush.

14. The floor brush assembly according to claim 13, characterized in that: The distance from the point Ph to the vertical line L is not greater than half of the radius of the rear roller brush.

15. The floor brush assembly according to claim 13, characterized in that: The distance from the point Ph to the vertical line L is not greater than one fifth of the radius of the rear roller brush.

16. The floor brush assembly according to claim 13, characterized in that: The distance from the point Ph to the vertical line L is zero.

17. A floor brush assembly, comprising a floor brush body, on which a front support wheel, a front roller brush, a rear roller brush and a rear support wheel are arranged in sequence from front to rear; wherein: The floor brush assembly is configured to have a first working state and a second working state adapted to different surfaces to be cleaned; In the first working state, the front support wheel and the rear support wheel in a high position are supported on the surface of the first surface to be cleaned; In the second working state, the front support wheel is sunk into the second surface to be cleaned, and the rear support wheel in a low position is supported on the surface of the second surface to be cleaned; Project the side of the floor brush assembly onto a reference plane to make a first reference line and a second reference line. The first reference line and the second reference line are compared to point Pi; make a perpendicular line L to the first reference line through point Pi, and make a perpendicular line T to the first reference line through the rotation axis of the rear roller brush; the distance between the perpendicular line L and the perpendicular line T is not greater than the radius of the rear roller brush; The first reference line is a projection of the first surface to be cleaned on the reference plane in the first working state, and the second reference line is a projection of the second surface to be cleaned on the reference plane in the second working state.

18. The floor brush assembly according to claim 17, characterized in that: The distance between the vertical line L and the vertical line T is not greater than half of the radius of the rear roller brush.

19. The floor brush assembly according to claim 17, characterized in that: The distance between the vertical line L and the vertical line T is not greater than one fifth of the radius of the rear roller brush.

20. The floor brush assembly according to claim 17, characterized in that: The distance between the vertical line L and the vertical line T is zero.

21. A vacuum cleaner, characterized in that: Comprising a floor brush assembly as described in any one of claims 1 to 20.

Images