Disc brush for power scrubber and power scrubber

Abstract

Disclosed is a disc brush (100) for a power scrubber and a power scrubber having such a disc brush (100), which relates to power tools. The disc brush (100) includes an inner disc body (110) and an outer disc body (120), the inner disc body (110) being disposed at an inner periphery of the outer disc body (120), a scrubbing body (130) being set at an underside of the inner disc body (110) and at an underside of the outer disc body (120), respectively; the scrubbing bodies are differentiated into at least two degrees of hardness, a softer scrubbing body (134, 131) being set with a height not lower than that of a harder scrubbing body (135, 132). The power scrubber includes a housing (200), an electric motor (400), a drive assembly, and the disc brush (100) described above; the electric motor actuates, via the drive assembly, the inner disc body (110) and the outer disc body (120) to rotate in opposite directions or in a same direction. A user may choose to use the softer scrubbing body (134, 131) or the harder scrubbing body (135, 132) to scrub dirt dependent on a degree of dirtiness without a need of changing the disc brush (100), which improves user experience.

Description

[0001] The subject matter described herein relates to power tools, and more particularly relates to a disc brush for a power scrubber; in addition, the subject matter described herein further relates to a power scrubber having such a disc brush.

[0002] Driven by the advancement of industrialization, a growing variety of power tools have emerged to implement various tasks, e.g., a power scrubber. An existing power scrubber generally comprises a housing, an electric motor, and a disc brush, where the electric motor actuates the disc brush to spin, so that the spinning disc brush scrubs a to-be-cleaned object or surface. The power scrubber significantly facilitates a user's cleaning work, for example, washing a car, or cleaning a kitchen item, a floor surface, or a wall surface. To enhance user experience, an existing power scrubber adopts a structure comprising an inner disc body and an outer disc body; opposite rotation between the inner disc body and the outer disc body may offset a fraction of the centrifugal force, which mitigates a movement tendency of the disc brush, thereby improving grip comfort for the operating user. However, the bristles on the inner and outer disc bodies of the existing power scrubber usually have identical settings, i.e., same hardness and length, so that they have substantially equal dirt scrubbing capabilities. The bristles with the same scrubbing capabilities cannot satisfy scrubbing requirements posed by varying degrees of dirtiness on different parts of a to-be-cleaned object or surface, so that the user needs to change the disc brush or scrub the dirt manually.

[0003] The above and other drawbacks in conventional technologies is overcome by a disc brush for a power scrubber according to Claim 1. Embodiments thereof and a power scrubber is provided with the features of the dependent claims. The features of the claims can be combined with one another and / or with other features in the description and the figures, leading to further embodiments.

[0004] To overcome the above and other drawbacks in conventional technologies, the present disclosure provides a disc brush for a power scrubber; a user may choose to use a softer scrubbing body or a harder scrubbing body to scrub dirt dependent on a degree of dirtiness without a need of changing the disc brush, which improves user experience.

[0005] A disc brush for a power scrubber as described herein comprises an inner disc body and an outer disc body, the inner disc body being disposed at an inner periphery of the outer disc body, a scrubbing body being set at an underside of the inner disc body and at an underside of the outer disc body, respectively, wherein the scrubbing bodies are differentiated into at least two degrees of hardness, a softer scrubbing body being set with a height not lower than that of a harder scrubbing body.

[0006] In some implementations, the scrubbing bodies are made of a same material, or the scrubbing bodies are made of different materials.

[0007] In some implementations, the scrubbing bodies are formed by a softer sponge and a harder sponge, respectively, the softer sponge being set with a height larger than that of the harder sponge.

[0008] In some implementations, the scrubbing bodies are formed by a softer bristle bundle and a harder bristle bundle, respectively, the softer bristle bundle being set with a height larger than that of the harder bristle bundle.

[0009] In some implementations, the softer bristle bundle and the harder bristle bundle are formed of a plurality of bristles, respectively, a diameter of the bristles forming the softer bristle bundle being smaller than that of the bristles forming the harder bristle bundle.

[0010] In some implementations, the softer bristle bundle and the harder bristle bundle are formed of a plurality of bristles, respectively, the bristles being formed into a wave shape.

[0011] In some implementations, the softer scrubbing body is set with a height larger than that of the harder scrubbing body, height difference Δ h therebetween ranging from 1 mm to 10 mm.

[0012] In some implementations, the scrubbing bodies are formed by a softer scrubbing body disposed at the underside of the inner disc body and a harder scrubbing body disposed at the underside of the outer disc body; or, the scrubbing bodies are formed by a harder scrubbing body disposed at the underside of the inner disc body and a softer scrubbing body disposed at the underside of the outer disc body.

[0013] In some implementations, a recessed cavity configured to receive the inner disc body is provided at the inner periphery of the outer disc body, the inner disc body, when being assembled with the outer disc body, being located in the recessed cavity, the undersides of the inner disc body and the outer disc body assembled together being set flush with each other.

[0014] The present disclosure further provides a power scrubber, comprising a housing, an electric motor, and a drive assembly, the electric motor and the drive assembly being disposed inside the housing, the drive assembly comprising an inner shaft and an outer shaft sleeved outside the inner shaft, wherein the power scrubber further comprises the disc brush described supra, the disc brush being disposed outside the housing, the inner disc body being removably connected to the inner shaft, the outer disc body being removably connected to the outer shaft, the electric motor actuating, via the drive assembly, the inner disc body and the outer disc body to rotate in opposite directions or in a same direction.

[0015] With the technical solutions described supra, the present disclosure offers the following benefits: 1. According to the disc brush described herein, a scrubbing body is set at the underside of the inner disc body and the underside of the outer disc body, respectively, the scrubbing bodies being differentiated into at least two degrees of hardness, a softer scrubbing body being set with a height not lower than that of a harder scrubbing body. A user may choose to use the softer scrubbing body or the harder scrubbing body to scrub dirt dependent on a degree of dirtiness without a need to change the disc brush, which improves user experience. By setting the softer scrubbing body with a height larger than that of the harder scrubbing body, when the operating user exerts a force against the disc brush so as to scrub a to-be-cleaned object or surface with the scrubbing bodies, the softer scrubbing body is deformed to a larger extent, while the harder scrubbing body is deformed less. Since the softer scrubbing body is higher than the harder scrubbing body, the more deformed softer scrubbing body and the less deformed harder scrubbing body can both access the to-be-cleaned object or surface to implement effective scrubbing. The user may vary the scrubbing forces of the softer scrubbing body and the harder scrubbing body by varying the force applied against the disc brush; as such, the user may impose a rational force against the disc brush according to scrubbing requirements. 2. The softer scrubbing body and the harder scrubbing body may be made of a same material or may be made of different materials. In a case that the scrubbing bodies are made of different materials, the scrubbing bodies of different materials serve different purposes in scrubbing a to-be-cleaned object or surface. For example, a sponge may generate bubbles first, and then the bristle bundle serves to scrub, whereby a better cleaning effect is achieved. 3. The scrubbing bodies may adopt sponges; in this case, the softer sponge is set with a height greater than that of the harder sponge. The softer sponge and the harder sponge may be made of a same sponge material. The harder sponge, which is more compact than the softer sponge, is harder than the latter. When the operating user applies a force against the disc brush, the softer sponge is more deformed under stress, while the harder sponge is less deformed, in which case the softer and harder sponges can both scrub the to-be-cleaned object or surface effectively. The softer sponge may serve to generate bubbles, while the harder sponge may serve to scrub and remove dirt or debris. 4. The scrubbing bodies may adopt bristle bundles. In this case, the softer bristle bundle is set with a height larger than that of the harder bristle; the softer bristle bundle and the harder bristle bundle may be made of a same material such as plastics or nylon; in a case that the softer bristle bundle and the harder bristle bundle are consistent in thickness, the longer bristle bundle is softer, while the shorter bristle bundle is harder. When the operating user exerts a force against the disc brush, the softer bristle bundle is deformed to a larger extent, while the harder bristle bundle is deformed less, so that the softer bristle bundle and the harder bristle bundle can both serve to scrub the to-be-cleaned object or surface effectively. For example, upon scrubbing, the harder bristle bundle may be used first to scrub agglomerated stains, and then the softer bristle bundle serves to further sweep residual spotted stains. 5. The softer bristle bundle and the harder bristle bundle are both formed of bristles. For the bristles made of a same material, the bristles with a smaller diameter are softer, while the bristles with a larger diameter are harder. In a case that the bristles of the softer bristle bundle and the bristles of the harder bristle bundle vary in height, thickness is a further variable that enlarges the difference between their hardnesses. 6. The bristles forming the bristle bundles are configured with a wave form, so that the bristle bundles formed by a plurality of wave-like bristles maintain a fluffy state with liquid absorbed, which prevents the bristles in the same bundle from being agglomerated due to absorption of water, thereby enhancing the effect of the bristle bundles cleaning the to-be-cleaned object or surface. 7. The softer scrubbing body is set with a height greater than that of the harder scrubbing body; by rationally setting the height difference between the softer scrubbing body and the harder scrubbing body, the softer and harder scrubbing bodies can both scrub the to-be-cleaned object or surface effectively during operating. If the height difference Δ h is too small, the softer scrubbing body is given an insufficient contact force against the to-be-cleaned object or surface when the disc brush is stressed, so that the softer scrubbing body cannot achieve effective scrubbing with respect to the to-be-cleaned object or surface. If the height difference Δ h is too large, the harder scrubbing body is given an insufficient contact force against the to-be-cleaned object or surface when the disc brush is stressed, so that the harder scrubbing body cannot achieve effective scrubbing with respect to the to-be-cleaned object or surface. 8. The scrubbing bodies at the undersides of the inner disc body and outer disc body may adopt a scrubbing structure that is softer inside and harder outside or a scrubbing structure that is harder inside and softer outside; the scrubbing bodies set at the undersides of the inner disc body and outer disc body may be made of a same material with a same hardness, which facilitates enhancement of the efficiency of manufacturing the inner disc body and outer disc body. 9. When the inner disc body and the outer disc body are assembled together, the inner disc body is received in the recessed cavity of the outer disc body, so that the underside of the inner disc body may be set flush with the underside of the outer disc body; in this way, the lower end of the softer scrubbing body may be set lower than the lower end of the harder scrubbing body, whereby the softer scrubbing body and the harder scrubbing body, when operating, can both give an effective scrubbing to the to-be-cleaned object or surface.

[0016] The invention as well as the technical field of the invention is further explained by the accompanying figures. The figures show implementations, wherein technical features may be extracted and combined with other features of the figures and / or other implementations, the description and the claims if not explicitly excluded in the following specification. All figures are schematic. Fig. 1 is a sectional view of a disc brush according to a first implementation; Fig. 2 is a schematic diagram of harder bristle bundles and softer bristle bundles in the disc brush according to the first implementation; Fig. 3 is a schematic diagram of bristle bundles in the disc brush according to the first implementation; Fig. 4 is a first structural view of an inner disc body of the disc brush according to the first implementation; Fig. 5 is a second structural view of the inner disc body of the disc brush according to the first implementation; Fig. 6 is a structural view of an outer disc body of the disc brush according to the first implementation; Fig. 7 is a structural view of a power scrubber according to the first implementation; Fig. 8 is a structural view of the power scrubber according to the first implementation, covering an electric motor, a drive assembly, and a speed reducer; Fig. 9 is an exploded view of the power scrubber according to the first implementation, covering the electric motor, the drive assembly, and the speed reducer; Fig. 10 is a structural view of an inner shaft in the power scrubber according to the first implementation; Fig. 11 is a structural view of a connector in the power scrubber according to the first implementation; Fig. 12 is an exploded view of a power scrubber according to a second implementation, covering an electric motor and a drive assembly; Fig. 13 is a structural view of the drive assembly in the power scrubber according to the second implementation; Fig. 14 is a sectional view of a brush disc according to a fourth implementation; and Fig. 15 is a sectional view of a brush disc according to a fifth implementation.

[0017] In the drawings: 100 - disc brush; 110 - inner disc body; 111 - fit-in hole; 112 - fit-in recess; 113 - turnbuckle; 1131 - arcuate segment; 1132 - linear segment; 114 - finger groove; 120 - outer disc body; 121 - recessed cavity; 122 - connecting hole; 123 - female thread; 124 - water discharge channel; 130 - scrubbing body; 131 - softer bristle bundle; 132 - harder bristle bundle; 133 - bristles; 134 - softer sponge; 135 - harder sponge; 200 - housing; 210 - main housing; 220 - bottom housing; 300 - drive assembly; 310 - inner shaft; 311 - gear section; 312- snap-on connector; 313 - snap-fitting block; 314 - stop protrusion; 320 - outer shaft; 321 - male thread; 330 - coupling sleeve; 340 - first bearing set; 350 - second bearing set; 360 - rack; 361 - ring gear; 370 - planetary gear; 371 - upper toothed portion; 372 - lower toothed portion; 381 - upper planetary carrier; 382 - lower planetary carrier; 390 - supporting shaft; 31 - driving wheel; 32 - first-stage planetary gear; 33 - first-stage planetary carrier; 34 - sun gear; 35 - second-stage planetary gear; 36 - second-stage planetary carrier; 37 - ring gear cylinder; 38 - coupling shaft; 39 - coupling cylinder; 400 - electric motor; 410 - rotary shaft; 500 - speed reducer; 510 - output shaft; 600 - supporting frame

[0018] Hereinafter, the present disclosure will be further explained through example implementations with reference to the accompanying drawings. It would be understood that the orientational or positional relationships indicated by the terms "upper," "lower," "left," "right," "longitudinal," "transverse," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc. are orientational and positional relationships based on the drawings, which are intended only for facilitating description of the disclosure and simplifying relevant illustrations, not for indicating or implying that the devices or elements compulsorily possess those specific orientations and are compulsorily configured and operated with those specific orientations; therefore, such terms should not be construed as limitations to the disclosure.First Implementation

[0019] Referring to Figs. 1 to 6, a disc brush 100 for a power scrubber according to a first implementation of the present disclosure comprises an inner disc body 110 and an outer disc body 120, the inner disc body 110 being disposed at an inner periphery of the outer disc body 120, a scrubbing body 130 being set at an underside of the inner disc body 110 and an underside of the outer disc body 120, respectively; the scrubbing bodies 130 are differentiated into at least two degrees of hardness, a softer scrubbing body being set with a height not lower than that of a harder scrubbing body.

[0020] A user may choose to use the softer scrubbing body or the harder scrubbing body to scrub dirt dependent on a degree of dirtiness without a need to change the disc brush, which improves user experience. By setting the softer scrubbing body with a height larger than that of the harder scrubbing body, when the operating user exerts a force against the disc brush 100 so that the scrubbing bodies 130 scrub a to-be-cleaned object or surface, the softer scrubbing body is deformed to a larger extent, while the harder scrubbing body is deformed less. Since the softer scrubbing body is higher than the harder scrubbing body, the more deformed softer scrubbing body and the less deformed harder scrubbing body can both access the to-be-cleaned object or surface to implement effective scrubbing. The user may vary the scrubbing forces of the soft scrubbing body and the hard scrubbing body by varying the force applied against the disc brush 100; as such, the user may impose a rational force against the disc brush 100 according to scrubbing requirements.

[0021] Referring to Figs. 1 and 2, in this implementation, the scrubbing bodies 130 at the underside of the disc brush 100 adopt a bristle structure made of a same material. Specifically, the scrubbing bodies 130 are formed by a softer bristle bundle 131 and a harder bristle bundle 132, respectively, a height of the softer bristle bundle 131 being exemplarily larger than that of the harder bristle bundle 132. In an exemplary solution of this implementation, a plurality of softer bristle bundles 131 distributed at even intervals are set on the underside of the inner disc body 110, and a plurality of harder bristle bundles 132 distributed at even intervals are set on the underside of the outer disc body 120, i.e., the bristle bundles at the underside of the disc brush 100 are distributed in a manner of softer inside and harder outside. After the disc brush 100 is assembled to the power scrubber, the underside of the inner disc body 110 and the underside of the outer disc body 120 are substantially flush with each other; correspondingly, a lower end of the softer bristle bundle 131 is lower than a lower end of the harder bristle bundle 132 with a height difference Δ h therebetween. As an alternative solution of this implementation, the underside of the inner disc body 110 may be set with a plurality of harder bristle bundles 132 distributed at even intervals, and the underside of the outer disc body 120 may be set with a plurality of softer bristle bundles 131 distributed at even intervals, i.e., the bristle bundles at the underside of the disc brush 100 are distributed in a manner of harder inside and softer outside.

[0022] In this implementation, the softer bristle bundle 131 and the harder bristle bundle 132 are both formed of a plurality of bristles 133, and the bristles of the softer bristle bundle 131 and the bristles of the harder bristle bundle 132 are made of a same type of plastics or nylon or the like. In addition, the diameter of the bristles forming the softer bristle bundle 131 is consistent with that of the bristles forming the harder bristle bundle 132. With the same diameter, longer bristles are softer while shorter bristles are harder, whereby the softer bristle bundles 131 and the harder bristle bundles 132, which have different heights, are contributed different hardnesses. Specifically, the root of the softer bristle bundle 131 is fixedly implanted into the underside of the inner disc body 110, and the root of the harder bristle bundle 132 is fixedly implemented into the underside of the outer disc body 120. Height H1 of the softer bristle bundle 131 refers to downward extension distance of the softer bristle bundle 131 relative to the underside of the inner disc body 110, and height H2 of the harder bristle bundle 132 refers to downward extension distance of the harder bristle bundle 132 relative to the underside of the outer disc body 120, height H1 of the softer bristle bundle 131 being greater than height H2 of the harder bristle bundle 132, H1-H2 being represented by Δ h .

[0023] In this implementation, 1 mm ≤ Δ h ≤ 10 mm. Specifically, height H1 of the softer bristle bundle 131 is about 24 mm, and height H2 of the harder bristle bundle 132 is about 20 mm; correspondingly, the height difference Δ h between the softer bristle bundle 131 and the harder bristle bundle 132 is about 4 mm. As an alternative solution to this implementation, height H1 of the softer bristle bundle 131 may also be set to other rational values such as 20 mm, 21 mm, 22 mm, 23 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, and 30 mm, height H2 of the harder bristle bundle 132 may also be set to other rational values such as 16 mm, 17 mm, 18 mm, 19 mm, 21 mm, 22 mm, 23 mm, 24 mm, and 25 mm, and height difference Δ h between the softer bristle bundle 131 and the harder bristle bundle 132 may also be set to other rational values such as 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm.

[0024] If liquid is existent in the way of scrubbing, the bristle bundles would absorb the liquid, while the liquid temporarily stored in the bristle bundles would cause agglomeration of the bristles 133 in the same bristle bundle, which deteriorates the scrubbing effect of the bristle bundles. On this basis, with reference to Fig. 3, in this implementation, the bristles forming the softer bristle bundle 131 and the bristles forming the harder bristle bundle 132 are exemplarily configured with a wave form, so that the bristle bundle formed by a plurality of wave-like bristles 133 can still maintain a fluffy state with liquid absorbed, which ensures the effect of the bristle bundle scrubbing the to-be-cleaned object or surface. As an alternative solution to this implementation, the bristles 133 forming the softer bristle bundle 131 may adopt straight bristles, and the bristles forming the harder bristle bundle 132 may also adopt straight bristles.

[0025] In this implementation, to better satisfy scrubbing requirements, two inner disc bodies 110 and one outer disc body 120 are provided. The softer bristle bundles 131 at the undersides of the two inner disc bodies 110 have different lengths, which results in different hardnesses. Any of the inner disc bodies 110 can be combined with the outer disc body 120 to form the disc brush 100, which facilitates the user to choose one for assembly according to actual scrubbing requirements, so that the power scrubber can satisfy various purposes, reducing purchase costs while improving user experience. To facilitate user identification, the bristle bundles with different degrees of hardness are indicated by different colors. As an alternative solution to this implementation, only one inner disc body 110 may be provided; in this case, two outer disc bodies 120 may be provided. Of course, other rational numbers of the inner disc bodies 110 and the outer disc bodies 120, such as one, two, three and four, may be provided, respectively; the number of the inner disc bodies 110 as provided may be identical to or different from the number of the outer disc bodies 120.

[0026] Referring to Figs. 4 and 6, to set the bristle bundles, a plurality of orifices distributed at even intervals are provided at the underside of the inner disc body 110 and the underside of the outer disc body 120, respectively, and the roots of the bristle bundles are securely implanted in the orifices. Referring to Fig. 6, a recessed cavity 121 recessed inwardly upward from the underside is provided at the inner periphery of the outer disc body 120. Referring to Fig. 1, when the inner disc body 110 and the outer disc body 120 are assembled together, the inner disc body 110 is received in the recessed cavity 121, the underside of the inner disc body 110 and the underside of the outer disc body 120 being set substantially flush with each other.

[0027] Referring to Fig. 7, this implementation further provides a power scrubber, comprising a housing 200, an electric motor 400, a drive assembly 300, and the disc brush 100 described supra, the electric motor 400 and the drive assembly 300 being disposed inside the housing 200, the drive assembly 300 comprising an inner shaft 310 and an outer shaft 320 sleeved outside the inner shaft 310, the inner disc body 110 being removably connected to the inner shaft 310, the outer disc body 120 being removably connected to the outer shaft 320, the electric motor 400 actuating, via the drive assembly 300, the inner disc body 110 and the outer disc body 120 to rotate in opposite directions. Opposite rotation between the inner disc body 110 and the outer disc body 120 may offset a fraction of centrifugal forces, thereby mitigating a movement tendency of the power scrubber when the disc brush disc 100 is rotating, which can reduce the force needed by the user to hold the tool and improves user experience.

[0028] Referring to Figs. 7, 8, and 9, the housing 200 comprises a main housing 210 and a bottom housing 220 that are fixed together; the power scrubber further comprises a speed reducer 500, the speed reducer 500 comprising an input shaft, an output shaft 510, and a planetary gear reduction construction, the planetary gear reduction construction being arranged between the input shaft and the output shaft 510, a rotary shaft of the electric motor 400 being drivingly connected to the input shaft of the speed reducer 500, an upper end of the inner shaft 310 being drivingly connected directly to the output shaft 510 of the speed reducer 500 via a coupling sleeve 330. The output shaft 320 is set hollow axially. The inner shaft 310 is rotatably supported inside the outer shaft 320 by a first bearing set 340. The outer shaft 320 is rotatably supported on the bottom housing 220 by a second bearing set 350. An upper end of the inner shaft 310 is provided with a gear section 311 that is located above the outer shaft 320. The drive assembly 300 further comprises a rack 360, a planetary gear 370, an upper planetary carrier 381, and a lower planetary carrier 382, the rack 360 being fixed to a bottom portion of the speed reducer 500, a lower portion of the rack 360 being provided with a ring gear 361, the upper planetary carrier 381 being disposed at a bottom portion of the rack 360, the lower planetary carrier 382 being located under the upper planetary carrier 381, the planetary gear 370 being supported between the upper planetary carrier 381 and the lower planetary carrier 382 by a supporting shaft 390, an upper end of the supporting shaft 390 being securely connected to the upper planetary carrier 381, a lower end of the supporting shaft 390 being securely connected to the lower planetary carrier 382, an upper end of the outer shaft 320 being securely connected to the upper planetary carrier 381. The ring gear 361 on the rack 360 is arranged vertically above the gear section 311 on the inner shaft 310. Two or three planetary gears 370 are arranged circumferentially at even intervals, each planetary gear 370 comprising an upper toothed portion 371 meshing with the ring gear 361 and a lower toothed portion 372 meshing with the gear section 311. When the electric motor 400 is operating, power is outputted via the output shaft 510 of the speed reducer 500, the output shaft 510 drives, via the coupling sleeve 330, the inner shaft 310 to rotate synchronously, the rotating inner shaft 310 drives, via engagement between the gear section 311 and the planetary gears 370, the upper planetary carrier 381 and the lower planetary carrier 382 to rotate, and the rotating lower planetary carrier 382 drives the outer shaft 320 to rotate synchronously. Since the gear section 311 and the planetary gears 370 mesh with each other, and they rotate in opposite directions, so that the inner shaft 310 rotates in a direction opposite to the planetary carrier, and the inner shaft 310 and the outer shaft 320 also rotate in opposite directions, whereby the electric motor 400 can actuate, via the drive assembly 300, the inner shaft 310 and the outer shaft 320 to rotate in opposite directions.

[0029] To facilitate removal and replacement of the disc brush 100, in this implementation, the outer disc body 120 is removably thread-fitted to the lower end of the outer shaft 320; and the inner disc body 110 is removably snap-fitted to the lower end of the inner shaft 310. The lower end of the outer shaft 320 projects downward from the bottom housing 220 out of the housing 200, and a male thread 321 is set on an outer peripheral surface of the lower end of the outer shaft 320. Referring to Fig. 6, a connecting hole 122 disposed on top of the recessed cavity 121 and communicating with the recessed cavity 121 is set in the center of the outer disc body 120; a female thread 123 is set on an inner wall of the connecting hole 122; the outer disc body 120 is removably connected to the lower end of the outer shaft 320 via fitting between the female thread 123 and the male thread 321. Referring to Fig. 10, the lower end of the inner shaft 310 projects downward out of the housing 200; a snap-on connector 312 projecting out of the outer shaft 320 is secured to the lower end of the inner shaft 310, and a plurality of snap-fitting blocks 313 distributed circumferentially at intervals are provided on an outer peripheral surface of the snap-on connector 312. Referring to Fig. 5, a fit-in hole 111 fitted with the snap-on connector 312 is set in the center of the inner disc body 110, a turnbuckle 113 corresponding to the snap-fitting block 313 is arranged on an inner wall of the fit-in hole 111, and the inner disc body 110 is removably connected to the lower end of the inner shaft 310 via fitting between the turnbuckle 113 on the inner wall of the fit-in hole 111 and the snap-fitting block 313 on the outer peripheral surface of the snap-on connector 312.

[0030] To ensure connection secureness of the outer disc body 120, a thread direction of the thread fitting is exemplarily set opposite the rotating direction of the outer shaft 320, so that the thread fitting becomes increasingly tighter while the outer shaft 320 drives the outer disc body 120 to rotate, preventing the outer disc body 120 from being loosened or released relative to the outer shaft 320. To ensure connection secureness of the inner disc body 110, the snap-fitting direction between the turnbuckle 113 and the snap-fitting block 313 is exemplarily set opposite the rotating direction of the inner shaft 310, preventing the turnbuckle 113 and the snap-fitting block 313 from being loosened or released while the inner disc body 110 is rotating. Furthermore, the turnbuckle 113 comprises an arcuate segment 1131 extending circumferentially along the fit-in hole 111 and a linear segment 1132 extending axially along the fit-in hole 111, the arcuate segment 1131, the linear segment 1132, and the inner wall of the fit-in hole 111 being combined to form a fit-in recess 112. Referring to Fig. 11, a stop protrusion 314 is provided at an upper surface of the snap-fitting block 313 and a lower surface of the arcuate segment 1131, respectively; when the snap-fitting block 313 is snap-fittingly screwed in the fit-in recess 112, the stop protrusion 314 on the upper surface of the snap-fitting block 313 and the stop protrusion 314 on the lower surface of the arcuate segment 1131 abut against each other in the circumferential direction of the fit-in hole 111, whereby the snap-fitting block 313 is circumferentially retained, which blocks the snap-fitting block 313 fitted in the fit-in recess 112 from back movement, further improving structural stability of the inner disc body 110.

[0031] To control a radial size of the drive assembly 300, it is needed to set a rational speed ratio between the inner shaft 310 and the outer shaft 320, based on which a rational speed ratio between the inner disc body 110 and the outer disc body 120 is set. In this implementation, the speed ratio between the inner disc body 110 and the outer disc body 120 ranges from 1:1 to 9:1. Specifically, due to speed reduction transmission via the drive assembly 300, the revolution speed of the outer shaft 320 is lower than that of the inner shaft 310; the speed ratio between the inner shaft 310 and the outer shaft 320 is about 4:1, so that the speed ratio between the inner disc body 110 and the outer disc body 120 is also 4:1. It may be understood that, the speed ratio between the inner disc body 110 and the outer disc body 120 may also be set to other rational values such as 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, and 9:1.

[0032] Referring to Fig. 4, to facilitate the user to remove and replace the inner disc body 110, a plurality of finger grooves 114 recessed inwardly towards the center of the inner disc body 110 are distributed at intervals on an outer peripheral surface of the inner disc body 110; the finger grooves 114 allow for the user to effectively hold the inner disc body 110, whereby the user may effectively screw the inner disc body 110, causing the inner disc body 110 to be snap-fitted with the inner shaft 310 in place or to be disengaged therefrom.

[0033] Referring to Fig. 6, to enhance the effect of the disc brush 100 scrubbing the to-be-cleaned object, a plurality of water discharge channels 124 distributed circumferentially at even intervals may be provided on a top wall of the recessed cavity 121; a specific structure of the water discharge channel 124 may refer to the disclosure in CN216876248U, which would not be detailed here.

[0034] To use the power scrubber described herein, the outer disc body 120 is first thread-fitted to the lower end of the outer shaft 320, and then the inner disc body 110 is snap-fitted to the lower end of the inner shaft 310. The electric motor 400 is started by activating the button on the housing 200, the running electric motor 400 actuates, via the speed reducer 500 and the drive assembly 300, the inner disc body 110 and the outer disc body 120 to rotate in opposite directions, and the inner disc body 110 and outer disc body 120 rotating in opposite directions drive the scrubbing body 130 to scrub a to-be-cleaned object or surface. Since the softer bristle bundle 131 at the underside of the inner disc body 110 and the harder bristle bundle 132 at the underside of the outer disc body 120 have different degrees of hardness, the user may use the harder bristle bundle 132 or the softer bristle bundle 131 to scrub local dirt according to scrubbing requirements.

[0035] In this implementation, the degrees of hardness of the scrubbing bodies made of a same material are differentiated based on the deformation degrees of the scrubbing bodies when the disc brush 100 is subjected to a same stress. In a case that the disc brush 100 is subjected to the same stress, the degree of deformation of the softer bristle bundle 131 is greater than that of the harder bristle bundle 132.

[0036] It may be understood that, in this implementation, the softer bristle bundle 131 and the harder bristle bundle 132 may be set with a same height, i.e., the lower end of the softer bristle bundle 131 is set substantially flush with the lower end of the harder bristle bundle 132.

[0037] It may be understood that, the power scrubber according to this implementation may be powered by batteries, or may be powered by mains electricity via a wire.

[0038] It may be understood that, the power scrubber according to this implementation may have an appearance generally resembling a pistol structure, a linear structure, or an elongated rod structure.

[0039] It may be understood that, in this implementation, three or four types of bristle bundle structures with different degrees of hardness may be adopted at the underside of the disc brush 100, and the heights of these bristle bundles may increase or decrease sequentially from the inside to the outside; in this case, two or more types of bristle bundles with different degrees of hardness distributed sequentially from the inside to the outside may be set at the underside of the inner disc body 110, or, two or more types of bristle bundles with different degrees of hardness distributed sequentially from the inside to the outside may be set at the underside of the outer disc body 120.

[0040] It may be understood that, in this implementation, a scouring pad structure, a chenille fabric structure, or another structure suitable for scouring purposes may also be adopted at the underside of the disc brush 100. In a case of adopting the scouring pad structure, the scouring pad set at the undersides of the inner disc body 110 and the outer disc body 120 may be distributed in a manner of thicker inside and thinner outside or thinner inside and thicker outside; in a case of adopting the chenille fabric structure, the chenille fabric set at the undersides of the inner disc body 110 and outer disc body 120 may be distributed in a manner of thicker inside and thinner outside or thinner inside and thicker outside.Second Implementation

[0041] Referring to Figs. 12 and 13, in this implementation, the electric motor 400 actuates, via the drive assembly 300, the inner disc body 110 and the outer disc body 120 to rotate in a same direction. Specifically, the electric motor 400 comprises a rotary shaft 410 configured to output power, and the drive assembly 300 is disposed at a bottom portion of the electric motor 400. The drive assembly 300 further comprises a driving wheel 31, a first-stage planetary gear 32, a first-stage planetary carrier 33, a sun gear 34, a second-stage planetary gear 35, a second-stage planetary carrier 36, a ring gear cylinder 37, a coupling shaft 38, and a coupling cylinder 39. The driving wheel 31 is sleeved over the rotary shaft 410. Two or three first-stage planetary gears 32 are set at even intervals along an outer periphery of the driving wheel 31, each first-stage planetary gear 32 being disposed on the first-stage planetary carrier 33 via a shaft and meshing with the driving wheel 31. The sun gear 34 is disposed at a bottom portion of the first-stage planetary carrier 33 and integrally formed with or fixedly connected to the first-stage planetary carrier 33. The second-stage planetary carrier 36 is disposed at a bottom portion of the sun gear 34. Two or three second-stage planetary gears 35 are set at even intervals along an outer periphery of the sun gear 34, each second-stage planetary gear 35 being disposed on the second-stage planetary carrier 36 via a shaft and meshing with the sun gear 34. The first-stage planetary gears 32, the first-stage planetary carrier 33, the sun gear 34, the second-stage planetary gears 35, and the second-stage planetary carrier 36 are arranged at an inner periphery of the ring gear cylinder 37; meanwhile, the first-stage planetary gears 32 and the second-stage planetary gears 35 both mesh with the teeth on an inner wall of the ring gear cylinder 37. An upper end of the coupling shaft 38 is fixedly connected to the driving wheel 31, a lower end of the coupling shaft 38 is fixedly connected to an upper end of the inner shaft 310 via the coupling cylinder 39, and an upper end of the outer shaft 320 is fixedly connected to the second-stage planetary carrier 36. When the electric motor 400 is operating, the rotary shaft 410 drives the driving wheel 31 to rotate synchronously. On one hand, the driving wheel 31 drives, via the coupling shaft 38 and the coupling cylinder 39, the inner shaft 310 to rotate; and on the other hand, the driving wheel 31 drives, via the first-stage planetary gears 32, the first-stage planetary carrier 33, the sun gear 34, the second-stage planetary gears 35, and the second-stage planetary carrier 36, the outer shaft 320 to rotate. The meshing between the driving wheel 31 and the first-stage planetary gears 32 and the meshing between the sun gear 34 and the second-stage planetary gears 35 allow for the inner shaft 310 and the outer shaft 320 to rotate in a same direction, so that the inner disc body 110 and the outer disc body 120 rotate in the same direction. In this implementation, a supporting frame 600 is arranged between the electric motor 400 and the drive assembly 300. The electric motor 400 may be fixed in the housing 200 via the supporting frame 600; and the first-stage planetary gears 32 are disposed at a bottom portion of the supporting frame 600.

[0042] The remaining structures of the second implementation are identical to those of the first implementation, which will not be detailed here.Third Implementation

[0043] In this implementation, the softer bristle bundle is set with a height larger than that of the harder bristle bundle, and diameter D1 of the bristles forming the softer bristle bundle is smaller than diameter D2 of the bristles forming the harder bristle bundle, i.e., D1<D2. For bristles made of a same material, bristles with a smaller diameter are softer, while bristles with a larger diameter are harder; in a case that the bristles of the softer bristle bundle and the bristles of the harder bristle bundle vary in height, thickness is a further variable that enlarges the difference between their hardnesses. As an optional solution to this implementation, the difference between D1 and D2 may be set to a rational value such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm.

[0044] In this implementation, the bristles at the underside of the disc brush may be distributed in a manner of softer inside and harder outside or may be distributed in a manner of harder inside and softer outside.

[0045] In this implementation, the inner disc body and the outer disc body of the disc brush may be driven by the electric motor to rotate in the same direction or in opposite directions.

[0046] The remaining structures of the third implementation are identical to those of the first implementation, which will not be detailed here.Fourth Implementation

[0047] Referring to Fig. 14, in this implementation, the scrubbing bodies at the underside of the disc brush 100 adopt a sponge structure of a same material; the scrubbing bodies 130 are formed by a softer sponge 134 and a harder sponge 135, respectively, the softer sponge 134 being set with a height greater than that of the harder sponge 135. Specifically, the softer sponge 134 is disposed at the underside of the inner disc body 110, and the harder sponge 135 is disposed at the underside of the outer disc body 120, so that the underside of the disc brush 100 adopts a sponge structure which is softer inside and harder outside. When the operating user applies a force against the disc brush 100, the softer sponge 134 is more deformed under stress, while the harder sponge 135 is less deformed, in which case both of the softer and harder sponges can effectively scrub the to-be-cleaned object or surface. The softer sponge 134 may serve to generate bubbles, while the harder sponge 135 may serve to scrub the dirt.

[0048] In this implementation, the softer sponge 134 and the harder sponge 135 may be made of a same sponge material; the harder sponge 135 has a density greater than the softer sponge 134; the harder sponge 135, which is more compact than the softer sponge 134, is harder than the softer sponge 134.

[0049] In this implementation, the height difference Δ h between the softer sponge 134 and the harder sponge 135 may be set to a rational value such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm.

[0050] In this implementation, the inner disc body 110 and the outer disc body 120 of the disc brush 100 may be driven by the electric motor to rotate in the same direction or in opposite directions.

[0051] In this implementation, the softer sponge 134 may be fixedly mounted to the underside of the inner disc body 110 in an irremovable manner, or may be removably attached to the underside of the inner disc body 110 by hook & loop, magnetic adhesion, or the like. The harder sponge 135 may be fixedly mounted to the underside of the outer disc body 120 in an irremovable manner, or may be removably attached to the underside of the outer disc body 120 by hook & loop, magnetic adhesion, or the like.

[0052] As an alternative solution to this implementation, the harder sponge 135 may also be disposed at the underside of the inner disc body 110 while the softer sponge 134 may be disposed at the underside of the outer disc body 120.

[0053] As an alternative solution to this implementation, the softer sponge 134 and the harder sponge 135 may also be set with a consistent height.

[0054] The remaining structures of the fourth implementation are identical to those of the first implementation, which will not be detailed here.Fifth Implementation

[0055] Referring to Fig. 15, in this implementation, the scrubbing body at the underside of the inner disc body 110 and the scrubbing body at the underside of the outer disc body 120 are made of different materials, i.e., the scrubbing bodies at the underside of the disc brush 100 are set with different materials. Specifically, a softer bristle bundle 131 is disposed at the underside of the inner disc body 110, a harder sponge 135 is disposed at the underside of the outer disc body 120, and height H3 of the softer bristle bundle 131 extending downward relative to the underside of the disc brush 100 is greater than height H4 of the harder sponge 135 extending downward relative to the underside of the disc brush 100; when the operating user imposes a force against the disc brush 100, the softer bristle bundle 131 is more deformed than the harder sponge 135.

[0056] As an alternative solution to this implementation, a softer sponge may be set at the underside of the inner disc body 110, while a harder bristle bundle may be set at the underside of the outer disc body 120.

[0057] As an alternative solution to this implementation, the scrubbing body set at the underside of the inner disc body 110 may be a scouring pad, a chenille fabric, or another material.

[0058] As an alternative solution to this implementation, the scrubbing body set at the underside of the outer disc body 120 may be a scouring pad, a chenille fabric, or another material.

[0059] In this implementation, the degrees of hardness of the scrubbing bodies made of different materials may be distinguished based on the deformation degrees of the scrubbing bodies under a same pressure imposed against the disc brush 100; when the disc brush 100 is subjected to a same pressure, the softer scrubbing body is more deformed than the harder scrubbing body.

[0060] In addition to the example implementation described above, the disclosure also has other implementations; those skilled in the art may make various modifications and transformations to the disclosure.

Claims

1. A disc brush (100) for a power scrubber, comprising an inner disc body (110) and an outer disc body (120), the inner disc body (110) being disposed at an inner periphery of the outer disc body (120), a scrubbing body (130) being set at an underside of the inner disc body (110) and at an underside of the outer disc body (120), respectively, wherein the scrubbing bodies (130) are differentiated into at least two degrees of hardness, a softer scrubbing body (134, 131) being set with a height not lower than that of a harder scrubbing body (135, 132).

2. The disc brush (100) for a power scrubber according to claim 1, wherein the scrubbing bodies (130) are made of a same material, or the scrubbing bodies (130) are made of different materials.

3. The disc brush (100) for a power scrubber according to any one of the preceding claims, wherein the scrubbing bodies (130) are formed by a softer sponge (134) and a harder sponge (135), respectively, the softer sponge (134) being set with a height larger than that of the harder sponge (135).

4. The disc brush (100) for a power scrubber according to any one of the preceding claims , wherein the scrubbing bodies (130) are formed by a softer bristle bundle (131) and a harder bristle bundle (132), respectively, the softer bristle bundle (131) being set with a height larger than that of the harder bristle bundle (132).

5. The disc brush (100) for a power scrubber according to claim 4, wherein the softer bristle bundle (131) and the harder bristle bundle (132) are formed of a plurality of bristles (133), respectively, a diameter of the bristles (133) forming the softer bristle bundle (131) being smaller than that of the bristles (133) forming the harder bristle bundle (132).

6. The disc brush (100) for a power scrubber according to claim 4, wherein the softer bristle bundle (131) and the harder bristle bundle (132) are formed of a plurality of bristles (133), respectively, the bristles (133) being formed into a wave shape.

7. The disc brush (100) for a power scrubber according to any one of the preceding claims , wherein the softer scrubbing body (134, 131) is set with a height larger than that of the harder scrubbing body (135, 132), height difference Δ h therebetween ranging from 1mm to 10 mm.

8. The disc brush (100) for a power scrubber according to any one of the preceding claims , wherein the scrubbing bodies (130) are formed by a softer scrubbing body (134, 131) disposed at the underside of the inner disc body (110) and a harder scrubbing body (135, 132) disposed at the underside of the outer disc body (120); or, the scrubbing bodies (130) are formed by a harder scrubbing body (135, 132) disposed at the underside of the inner disc body (110) and a softer scrubbing body (134, 131) disposed at the underside of the outer disc body (120).

9. The disc brush (100) for a power scrubber according to any one of the preceding claims , wherein a recessed cavity (121) configured to receive the inner disc body (110) is provided at the inner periphery of the outer disc body (120), the inner disc body (110), when being assembled with the outer disc body (120), being located in the recessed cavity (121), the undersides of the inner disc body (110) and the outer disc body (120) assembled together being set flush with each other.

10. A power scrubber, comprising a housing (200), an electric motor (400), and a drive assembly (300), the electric motor (400) and the drive assembly (300) being disposed inside the housing (200), the drive assembly (300) comprising an inner shaft (310) and an outer shaft (320) sleeved outside the inner shaft (310), wherein the power scrubber further comprises the disc brush (100) according to any one of claims 1 through 9, the disc brush (100) being disposed outside the housing (200), the inner disc body (110) being removably connected to the inner shaft (310), the outer disc body (120) being removably connected to the outer shaft (320), the electric motor (400) actuating, via the drive assembly (300), the inner disc body (110) and the outer disc body (120) to rotate in opposite directions or in a same direction.

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