Universal wheel and sweeper

Abstract

The utility model relates to a sweeper accessory technical field discloses a universal wheel and sweeper, this universal wheel includes the outer wheel with installation cavity, the inner wheel of setting in the inside of installation cavity and the support connected to inner wheel, the outer wheel is coaxial with inner wheel and both slide fit, the outer wheel rotates relative to inner wheel to travel, the upper portion of inner wheel is connected to the support and both relative fixation. The outer wheel rotates relative to the inner wheel, the inner wheel is located in the installation cavity of outer wheel and is fixed relative to the support, the inner wheel is not exposed in the outer portion of outer wheel, and the hair will not be wound on the inner wheel because of the rotation of outer wheel. And, the connecting position of inner wheel and support is located in the upper portion of inner wheel, and the distance from the ground is higher, and the hair also will not easily wind in the connecting place of inner wheel and support, reduces the risk of hair winding.

Description

Technical Field

[0001] This utility model relates to the technical field of sweeper accessories, specifically to a universal wheel and a sweeper. Background Technology

[0002] In current robotic vacuum cleaners, the wheels are connected to the bracket via a central axle. There is a gap between the wheels and the bracket. As the wheels rotate, hair on the ground is pulled and tangled on the axle, making it difficult to clean and affecting the smoothness of the wheels' rotation. In cases where a lot of hair is tangled, it can even cause the wheels to jam. Utility Model Content

[0003] The purpose of this invention is to overcome the problem of hair easily getting tangled in existing casters, and to provide a caster and sweeper in which the rotation method of the caster is changed, which can reduce and avoid the problem of hair getting tangled.

[0004] To achieve the above objectives, this utility model provides a universal wheel, including an outer wheel with a mounting cavity, an inner wheel disposed inside the mounting cavity, and a bracket connected to the inner wheel. The outer wheel and the inner wheel are coaxial and slidably engaged. The outer wheel rotates relative to the inner wheel to travel. The upper part of the inner wheel is connected to the bracket and the two are relatively fixed.

[0005] Preferably, the inner wheel has a first connecting hole, the bracket has a second connecting hole opposite to the first connecting hole, and the caster wheel also includes a connector that is inserted into the first connecting hole and the second connecting hole to connect the inner wheel and the bracket.

[0006] Preferably, the inner wheel is formed as a hollow cylindrical structure, and the first connecting hole is formed at the upper part of the inner wheel and is formed as a through hole.

[0007] Preferably, there are two second connecting holes, located on opposite sides of the inner wheel, and the connector is inserted from one of the second connecting holes into the first connecting hole and through the other second connecting hole.

[0008] Preferably, the caster wheel also includes a roller disposed in the mounting cavity. The outer wheel and the inner wheel are slidably engaged by the roller. A groove for mounting the roller is formed on the outer surface of the inner wheel. The roller is partially placed in the groove and contacts the cavity wall of the mounting cavity. The roller can roll relative to the groove under the action of the rotation of the outer wheel.

[0009] Preferably, the grooves are spaced in multiple intervals along the circumference of the inner wheel.

[0010] Preferably, the roller has a cylindrical structure, and the groove is formed in a non-through form along the axial direction of the inner wheel and from one side of the inner wheel to the other.

[0011] Preferably, the caster wheel further includes a sealing ring fixed to the side of the inner wheel and the side of the outer wheel, the sealing ring being configured to fix the roller within the mounting cavity.

[0012] Preferably, the outer wheel is formed in a spindle shape, and the mounting cavity is formed in a cylindrical shape, the diameter of which is larger than the diameter of the inner wheel.

[0013] The second aspect of this utility model provides a sweeping machine, including a body and the aforementioned casters.

[0014] With the above technical solution, the outer wheel rotates relative to the inner wheel, while the inner wheel is located inside the mounting cavity of the outer wheel and fixed relative to the bracket. The inner wheel is not exposed outside the outer wheel, so hair will not get tangled on the inner wheel due to the rotation of the outer wheel. Furthermore, the connection point between the inner wheel and the bracket is located at the upper part of the inner wheel, which is higher than the ground, so hair will not easily get tangled at the connection point between the inner wheel and the bracket, reducing the risk of hair entanglement. Attached Figure Description

[0015] Figure 1 This is a perspective view of the universal wheel of this utility model; Figure 2 yes Figure 1 Exploded view; Figure 3 yes Figure 1 A 3D view of the outer wheel, inner wheel, and rollers of a center caster wheel; Figure 4 yes Figure 3 The exploded view shows the addition of a sealing ring; Figure 5 yes Figure 1 A 3D view of the central support and connecting shaft.

[0016] Explanation of reference numerals in the attached figures 1-Outer wheel; 11-Sealing ring; 12-Mounting cavity; 2-Roller; 3-Inner wheel; 32-Groove; 34-First connecting hole; 4-Connector; 5-Bracket; 54-Second connecting hole; 6-Connecting shaft. Detailed Implementation

[0017] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the orientation corresponding to the accompanying drawings. "Inner" and "outer" refer to the inner and outer contours of the corresponding components.

[0018] Please refer to Figures 1 to 5 This utility model provides a universal wheel, including an outer wheel 1 with a mounting cavity 12, an inner wheel 3 disposed inside the mounting cavity 12, and a bracket 5 connected to the inner wheel 3. The outer wheel 1 and the inner wheel 3 are coaxial and slidably engaged. The outer wheel 1 rotates relative to the inner wheel 3 to move. The upper part of the inner wheel 3 is connected to the bracket 5 and the two are relatively fixed.

[0019] The inner wheel 3 is fixed, and the outer wheel 1 is fitted around the outer circumference of the inner wheel 3 and rotates relative to it. The traditional axle is eliminated, replaced by the inner wheel 3. The inner wheel 3 is located within the mounting cavity 12 and is not exposed outside the outer wheel 1. Even if the rotation of the outer wheel 1 moves hair on the ground, there is no place for the hair to become entangled. Furthermore, the connection point between the inner wheel 3 and the bracket 5 is located at the upper part of the inner wheel 3, higher than the ground, making it difficult for hair to follow the outer wheel 1 to the connection point between the inner wheel 3 and the bracket 5. Therefore, through the above design, the risk of hair entanglement can be effectively reduced or avoided.

[0020] Please refer to Figure 2 In some embodiments, the inner wheel 3 has a first connecting hole 34, and the bracket 5 has a second connecting hole 54 opposite to the first connecting hole 34. The caster wheel also includes a connector 4 that is inserted into the first connecting hole 34 and the second connecting hole 54 to connect the inner wheel 3 and the bracket 5.

[0021] When the inner wheel 3 and the outer wheel 1 are installed on the bracket 5, the first connecting hole 34 of the inner wheel 3 is aligned with the second connecting hole 54 of the bracket 5, and the connector 4 is inserted into the first connecting hole 34 and the second connecting hole 54 to complete the installation.

[0022] The first connecting hole 34 and the second connecting hole 54 are the same size, both smaller than the size of the connector 4. This allows the connector 4 to form an interference fit with the inner wheel 3 and the bracket 5, ensuring the stability of the connector 4 connection. Furthermore, because there are no gaps between the connector 4 and the first connecting hole 34 and the second connecting hole 54, it avoids providing space for the bracket 5 to move downwards, thus preventing the bracket 5 from pressing down on the outer wheel 1 and hindering its rotation. Figure 2 As shown, both the first connecting hole 34 and the second connecting hole 54 are fan-shaped holes, and the connector 4 has a semi-cylindrical structure.

[0023] Please refer to Figures 1 to 4 In some embodiments, the inner wheel 3 is formed as a hollow cylindrical structure, and the first connecting hole 34 is formed at the upper position inside the inner wheel 3 and is formed as a through hole.

[0024] The first connecting hole 34 is specifically formed above the horizontal axis of the inner wheel 3. The structure of the inner wheel 3 can reduce its own weight, making it easier for the outer wheel 1 to drive the inner wheel 3 to move, and making the entire caster wheel lighter.

[0025] like Figure 2 and Figure 4 As shown, the first connecting hole 34 in the shape of a fan is formed by a plate disposed inside the inner wheel 3. The plate is fixed at the upper part of the inner wheel 3 and forms the first connecting hole 34 with the inner top wall of the inner wheel 3.

[0026] Please continue reading. Figures 1 to 4In some embodiments, two second connecting holes 54 are formed, located on opposite sides of the inner wheel 3 respectively, and the connector 4 is inserted from one of the second connecting holes 54 into the first connecting hole 34 and through to the other second connecting hole 54.

[0027] The first connecting hole 34 is a through hole with both ends open. One of the second connecting holes 54 is aligned with one end of the first connecting hole 34, and the other second connecting hole is aligned with the other end of the first connecting hole 34. The length of the connector 4 is greater than the depth of the first connecting hole 34, so that the connector 4 can pass through the first connecting hole 34 and both ends of it can pass into the second connecting holes 54. This allows both sides of the inner wheel 3 to be connected to the bracket 5, thereby increasing the stability of the connection between the inner wheel 3 and the bracket 5, and making the rotation of the outer wheel 1 relative to the inner wheel 3 more stable.

[0028] Please refer to Figure 3 and Figure 4 In some embodiments, the caster wheel also includes a roller 2 disposed in the mounting cavity 12. The outer wheel 1 and the inner wheel 3 are slidably engaged by the roller 2. A groove 32 for mounting the roller 2 is formed on the outer surface of the inner wheel 3. The roller 2 is partially placed in the groove 32 and contacts the cavity wall of the mounting cavity 12. The roller 2 can roll relative to the groove 32 under the action of the rotation of the outer wheel 1.

[0029] As the outer wheel 1 rotates relative to the inner wheel 3, the roller 2 rolls, reducing the friction between the inner wheel 3 and the outer wheel 1, thus acting as a bearing. The groove 32 is used to limit the position of the roller 2, preventing it from rolling freely between the inner wheel 3 and the outer wheel 1. The roller 2 is partially located within the groove 32, allowing the portion of the roller 2 outside the groove 32 to contact the cavity wall of the mounting cavity 12, so that when the outer wheel 1 rotates, it can drive the roller 2 to roll.

[0030] Please continue reading. Figure 3 and Figure 4 In some embodiments, the grooves 32 are spaced in multiples along the circumferential distance of the inner wheel 3.

[0031] Each groove 32 is provided with a roller 2. The arrangement of multiple rollers 2 can separate the inner wheel 3 from the outer wheel 1, preventing the inner wheel 3 from directly contacting the outer wheel 1, thereby avoiding the two sliding against each other and causing friction and wear.

[0032] Please refer to Figure 4 In some embodiments, the roller 2 has a columnar structure, and the groove 32 is formed in a non-through form along the axial direction of the inner wheel 3 and from one side of the inner wheel 3 to the other side.

[0033] When roller 2 is installed into groove 32, from the open side of groove 32 ( Figure 4 The left side of the middle) is inserted into the closed side of the groove 32. Figure 4On the right side of the groove 32, the closed side can form a limit and block for the roller 2, reminding the installer that the roller 2 is installed in place and blocking the roller 2 to prevent the roller 2 from falling out of the groove 32.

[0034] Please continue reading. Figure 4 In some embodiments, the caster wheel also includes a sealing ring 11 fixed to the side of the inner wheel 3 and the side of the outer wheel 1, the sealing ring 11 being configured to fix the roller 2 in the mounting cavity 12.

[0035] The sealing ring 11 is disposed on one side of the inner wheel 3, and the groove 32 on that side of the inner wheel 3 is open, i.e. Figure 4 On the left side of the groove 32, the sealing ring 11 seals the open side of the groove 32 to prevent the roller 2 from detaching from the open side of the groove 32. The sealing ring 11 can be made of silicone and is fixed to the inner wheel 3 by adhesive bonding. Of course, it can also be fixed to the inner wheel 3 by other fixing methods.

[0036] Please continue reading. Figure 4 In some embodiments, the outer wheel 1 is formed as a spindle shape, and the mounting cavity 12 is formed as a cylinder with a diameter larger than that of the inner wheel 3.

[0037] The outer wheel 1 has a large outer diameter in the middle and small outer diameters on both sides, which reduces the contact area between the outer wheel 1 and the ground, thereby reducing the friction between them and making the outer wheel 1 rotate more smoothly and move more flexibly. The diameter of the mounting cavity 12 is equal to the outer diameter of the inner wheel 3 on which the rollers 2 are mounted. Combined with the shape of the mounting cavity 12, all rollers 2 can contact the cavity wall of the mounting cavity 12, ensuring that the outer wheel 1 rotates smoothly relative to the inner wheel 3.

[0038] During installation, the inner wheel 3 can be inserted into the mounting cavity 12 from one side of the outer wheel 1. Both sides of the outer wheel 1 can be open, allowing the connector 4 to pass through the first connecting hole 34 of the inner wheel 3 and the two second connecting holes 54 of the bracket 5. In other embodiments, one side of the outer wheel 1 can be open and the other side closed. The inner wheel 3 is inserted into the mounting cavity 12 from the open side. In this embodiment, the bracket 5 has only one second connecting hole 54, located on the open side of the outer wheel 1, allowing the connector 4 to pass through the second connecting hole 54 of the bracket 5 into the first connecting hole 34 of the inner wheel 3.

[0039] Please refer to Figure 1 , Figure 2 and Figure 5 In some embodiments, the support 5 includes an integrally formed annular structure and an extension structure below the annular structure. A second connecting hole 54 is formed on the side wall of the annular structure. The lower part of the annular structure is divided into two parts, wherein the first part ( Figure 5 The left part is used to connect the extended structure, where the second part ( Figure 5 The right portion of the bracket 5 is used to mount the outer wheel 1 and the inner wheel 3. The side of the first portion facing the outer wheel 1 is formed as a concave arc surface. The curvature and size of this concave arc surface are adapted to the outer surface of the outer wheel 1 to partially cover it. The annular structure above the second portion forms an arc-shaped cavity. The curvature and size of this cavity are adapted to the outer surface of the outer wheel 1. When the inner wheel 3 is connected to the bracket 5, the top of the outer wheel 1 is embedded in the cavity, preventing hair from moving to the upper part of the outer wheel 1. Furthermore, due to the obstruction of the annular structure, the outer wheel 1 is prevented from moving axially relative to the inner wheel 3, ensuring a stable fit between the outer wheel 1 and the inner wheel 3, preventing them from separating. In addition, the annular structure of the bracket 5 reduces the gap between it and the inner wheel 3 and the outer wheel 1, further reducing the risk of hair entanglement.

[0040] Please continue reading. Figure 1 , Figure 2 and Figure 5 In some embodiments, the omnidirectional wheel further includes a connecting shaft 6 rotatably connected to the bracket 5. The axis of the connecting shaft 6 is vertical, and the axis of the outer wheel 1 is horizontal, with the two directions perpendicular to each other. The connecting shaft 6 is used to connect to the body of the sweeper. The bracket 5 rotates relative to the connecting shaft 6, causing the outer wheel 1 to rotate on the horizontal plane. At the same time, the outer wheel 1 can also rotate relative to the inner wheel 3. The rotation direction of the bracket 5 relative to the connecting shaft 6, combined with the rotation direction of the outer wheel 1 relative to the inner wheel 3, achieves omnidirectional movement.

[0041] This utility model also provides a sweeping machine, including a body and the aforementioned casters.

[0042] The sweeper's casters possess all the technical solutions and effects of the aforementioned casters, which will not be elaborated upon here.

[0043] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A universal wheel, characterized in that, It includes an outer wheel (1) with a mounting cavity (12), an inner wheel (3) disposed inside the mounting cavity (12), and a bracket (5) connected to the inner wheel (3). The outer wheel (1) and the inner wheel (3) are coaxial and slide together. The outer wheel (1) rotates relative to the inner wheel (3) to travel. The upper part of the inner wheel (3) is connected to the bracket (5) and the two are fixed relative to each other.

2. The universal wheel according to claim 1, characterized in that, The inner wheel (3) has a first connecting hole (34) and the bracket (5) has a second connecting hole (54) opposite to the first connecting hole (34). The universal wheel also includes a connector (4) that is inserted into the first connecting hole (34) and the second connecting hole (54) to connect the inner wheel (3) and the bracket (5).

3. The universal wheel according to claim 2, characterized in that, The inner wheel (3) is formed as a hollow cylindrical structure, and the first connecting hole (34) is formed inside the inner wheel (3) at the upper position and is formed as a through hole.

4. The universal wheel according to claim 3, characterized in that, The second connecting hole (54) is formed in two, located on opposite sides of the inner wheel (3), and the connector (4) is inserted from one of the second connecting holes (54) into the first connecting hole (34) and through to the other second connecting hole (54).

5. The universal wheel according to claim 1, characterized in that, The universal wheel also includes a roller (2) disposed in the mounting cavity (12). The outer wheel (1) and the inner wheel (3) are slidably engaged by the roller (2). A groove (32) for mounting the roller (2) is formed on the outer surface of the inner wheel (3). The roller (2) is partially placed in the groove (32) and contacts the cavity wall of the mounting cavity (12). The roller (2) can roll relative to the groove (32) under the action of the rotation of the outer wheel (1).

6. The universal wheel according to claim 5, characterized in that, The grooves (32) are spaced in multiples along the circumferential direction of the inner wheel (3).

7. The universal wheel according to claim 5, characterized in that, The roller (2) has a columnar structure, and the groove (32) is formed in a non-through form along the axial direction of the inner wheel (3) and from one side of the inner wheel (3) to the other side.

8. The universal wheel according to claim 5, characterized in that, The universal wheel also includes a sealing ring (11) fixed to the side of the inner wheel (3) and the side of the outer wheel (1), the sealing ring (11) being configured to fix the roller (2) inside the mounting cavity (12).

9. The universal wheel according to claim 1, characterized in that, The outer wheel (1) is formed in a spindle shape, and the mounting cavity (12) is formed in a cylindrical shape with a diameter larger than that of the inner wheel (3).

10. A sweeping machine, characterized in that, Includes the fuselage and the caster wheels according to any one of claims 1 to 9.

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