Electric interdental brush

Abstract

The utility model discloses an electric interdental brush, which comprises a main body and a brush head part connected by a movable rod and used for being inserted into a tooth slit, the main body comprises a motor for controlling the brush head part to vibrate, the axis of an output shaft of the motor and the axis of the movable rod form an included angle between 70 degrees and 180 degrees, and the motor is matched with the movable rod through a rotation-translation conversion mechanism. The rotation-translation conversion mechanism comprises a large gear parallel to a plane defined by the axis of the motor and the axis of the movable rod, and the large gear is driven by a small gear fixed to an output shaft of the motor; the annular component is fixed to one end of the movable rod and provided with a first oval groove, and the first oval groove is matched with an eccentric protrusion on the transverse surface of the large gear. The utility model provides an electric interdental brush which is more simplified in structure, more convenient to assemble, lower in cost and higher in reliability.

Description

Technical Field

[0001] This utility model relates to interdental brushes, and more particularly to an electric interdental brush. Background Technology

[0002] An existing interdental brush includes a brush head, a handle, and a motor. One end of the brush head is slidably mounted on the handle, and the motor is installed inside the handle. The motor's output shaft is coupled to a reducer, and the reducer's output shaft is mounted on a crank. The crank is hinged to a connecting rod via a pivot pin, and the connecting rod is hinged to one end of the brush head. Thus, the motor can drive the brush head to slide back and forth. However, this existing technology is not entirely satisfactory because it uses many components, resulting in high cost, poor reliability, and complex assembly. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electric interdental brush with a simplified structure, easier assembly, reduced cost, and improved reliability.

[0004] An electric interdental brush according to an embodiment of the present invention includes a main body and a brush head for insertion into interdental spaces, connected by a movable rod. The main body includes a motor for controlling the vibration of the brush head. The axis of the motor output shaft forms an angle between 70° and 180° with the axis of the movable rod. The motor cooperates with the movable rod via a rotation-translation conversion mechanism. The rotation-translation conversion mechanism includes a large gear and an annular component. The large gear is parallel to a plane defined by the axis of the motor and the axis of the movable rod. The large gear is driven by a small gear fixed on the output shaft of the motor. The annular component is fixed to one end of the movable rod and has a first elliptical groove that cooperates with an eccentric protrusion on the transverse surface of the large gear.

[0005] The electric interdental brush according to the embodiments of this utility model has at least the following beneficial effects: The electric interdental brush provided by this utility model can achieve speed reduction by the cooperation of a large gear and a small gear, and then the eccentric protrusion on the large gear can directly cooperate with the first elliptical groove on the annular component to drive the movable rod to slide back and forth. As a result, the transmission method between the brush head and the motor is simpler, the structure of the electric interdental brush is more simplified, the assembly is more convenient, the cost is reduced, and the reliability is improved.

[0006] According to some embodiments of this utility model, the axis of rotation of the large gear passes through the intersection of the axis of the motor output shaft and the axis of the movable rod.

[0007] According to some embodiments of the present invention, the reduction ratio between the pinion and the gear is between 1 / 3 and 1 / 6.

[0008] According to some embodiments of the present invention, the extension radius of the eccentric protrusion is R, the width of the first elliptical groove is between R and 1.2R, and the length of the first elliptical groove is greater than 2R.

[0009] According to some embodiments of this utility model, the included angle between the axis of the motor output shaft and the axis of the movable rod is 120°±30°.

[0010] According to some embodiments of the present invention, the movable rod is axially movable, and the body has a chamber sealed by at least one annular seal and through which the movable rod passes.

[0011] According to some embodiments of the present invention, the annular component is formed by a molding part having a first layer and a second layer. The first layer has an elliptical cavity defining a first elliptical groove. The main axis of the first elliptical groove is perpendicular to the axis of the movable rod. The second layer is above the first layer, the movable rod is inserted into the second layer, and the second layer has a second elliptical groove. The main axis of the second elliptical groove is parallel to the axis of the movable rod, and the rotation axis of the large gear passes through the second elliptical groove.

[0012] According to some embodiments of the present invention, the brush head has a connecting section, and one end of the movable rod is connected to a connecting member, which connects to the connecting section.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0015] Figure 1 The main body of an electric interdental brush according to the present invention is shown in the figure.

[0016] Figure 2 A view of the interior of an electric interdental brush according to the present invention is shown;

[0017] Figure 3 A detailed view of the rotation-translation conversion mechanism of an electric interdental brush according to the present invention is shown;

[0018] Figure 4 Detailed views of the gears and annular components of an electric interdental brush according to the present invention are shown;

[0019] Figure 5 Another detailed view of the rotation-translation conversion mechanism of an electric interdental brush according to the present invention is shown.

[0020] Figure label:

[0021] Main body 100, sleeve 110, bending part 120, intermediate chamber 150, motor 10, pinion 12, battery pack 20, brush head 200, fiber brush 210, intermediate rod 220, connecting section 230, rotation-translation conversion mechanism 300, ring component 310, first layer 311, second layer 312, first elliptical groove 313, front end 314, rear end 315, second elliptical groove 326, movable rod 320, sealing ring 321, 322, large gear 350, rotating shaft 351, eccentric protrusion 352. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] Reference Figure 1 and Figure 2An electric interdental brush according to an embodiment of the present invention includes a main body 100 and a brush head 200 for insertion into interdental spaces, connected by a movable rod 320. The outer shell of the main body 100 consists of a generally tubular sleeve 110 and a curved portion 120, with the brush head 200 connected to the curved portion 120. The tubular sleeve 110 contains a motor 10 for controlling the vibration of the brush head 200 and a battery or battery pack 20.

[0027] Reference Figure 2 In some embodiments, the axis AL2 of the output shaft of the motor 10 and the axis AL1 of the movable rod 320 form an angle between 70° and 180°, so that people can use an electric interdental brush to clean between their teeth. Preferably, the angle between the axis AL2 of the output shaft of the motor 10 and the axis AL1 of the movable rod 320 is 120°±30°.

[0028] Reference Figures 2 to 4 According to an embodiment of the present invention, the motor 10 cooperates with the movable rod 320 through a rotation-translation conversion mechanism 300. The rotation-translation conversion mechanism 300 includes a large gear 350 and an annular component 310. The large gear 350 is parallel to the plane defined by the axis AL2 of the motor 10 and the axis AL1 of the movable rod 320. The large gear 350 is driven by a small gear 12 fixed on the output shaft of the motor 10. The annular component 310 is fixed to one end of the movable rod 320. The annular component 310 has a first elliptical groove 313, which cooperates with an eccentric protrusion 352 on the transverse surface of the large gear 350.

[0029] The electric interdental brush provided by this utility model can achieve speed reduction by the cooperation of a large gear 350 and a small gear 12. Then, the eccentric protrusion 352 on the large gear 350 can directly cooperate with the first elliptical groove 313 on the annular component 310 to drive the movable rod 320 to slide back and forth. As a result, the transmission method between the brush head 200 and the motor 10 is simpler, the structure of the electric interdental brush is simplified, the assembly is more convenient, the cost is reduced, and the reliability is improved.

[0030] Reference Figure 4 Specifically, the eccentric protrusion 352 is directly formed on the large gear 350 without assembly. The annular component 310 only needs to be fitted onto the eccentric protrusion 352 so that the eccentric protrusion 352 can be inserted into the first elliptical groove 313. There is no need for hinge between the eccentric protrusion 352 and the annular component 310. The annular component 310 is fixedly connected to the brush head 200 without hinge. Therefore, the transmission method between the brush head 200 and the motor 10 is simpler, fewer parts are required, the structure is simplified, and the assembly is more convenient.

[0031] The large gear 350 is parallel to the plane defined by axes AL1 and AL2. In other words, the radial direction of the large gear 350 is parallel to the plane defined by the axis AL2 of the output shaft of the motor 10 and the axis AL1 of the movable rod 320. The axis of the rotation shaft 351 of the large gear 350 is perpendicular to the plane defined by the axis AL2 of the motor 10 and the axis AL1 of the movable rod 320. With the above arrangement, the axial wobbling of the large gear 350 can be prevented from being transmitted to the movable rod 320, making the transmission between the brush head 200 and the motor 10 smoother.

[0032] According to an embodiment of the present invention, the axis of rotation 351 of the large gear 350 intersects the plane AL1 / AL2 at the intersection of axis AL1 and axis AL2. In other words, the axis of rotation of the large gear 350 is perpendicular to the axis AL2 of the output shaft of the motor 10 and the axis AL1 of the movable rod 320, thereby further improving the smoothness and reliability of transmission.

[0033] Reference Figure 3 and Figure 4 In specific implementation, the large gear 350 has a protrusion extending from the rotation axis 351 of the large gear 350 within a radius R, thereby forming an eccentric protrusion 352 with an extension radius of R. The width of the first elliptical groove 313 is equal to or slightly greater than R, between R and 1.2R, and the length of the first elliptical groove 313 is greater than 1.1R. For example, the length of the first elliptical groove 313 can be 1.5R, 2R, or greater.

[0034] Reference Figure 4 Driven by the large gear 350, the eccentric protrusion 352 rotates. When the eccentric protrusion 352 contacts the front end 314 of the annular component 310, the annular component 310 moves forward. When the eccentric protrusion 352 contacts the rear end 315 of the annular component 310, the annular component 310 moves backward. This allows the movable rod 320 to move back and forth with each revolution of the large gear 350.

[0035] Reference Figure 4 and Figure 5The annular portion is formed by a molded part fixed to the end of the movable rod 320. The molded part has a first layer 311 and a second layer 312. The first layer 311 has an elliptical cavity that defines a first elliptical groove 313. The main axis GJ of the first elliptical groove 313 is perpendicular to the axis AL1 of the movable rod 320. The second layer 312 is above the first layer 311. The movable rod 320 is inserted into the second layer 312. The height at which the second layer 312 connects to the movable rod 320 is sufficient to allow the eccentric protrusion 352 to pass under the movable rod 320. Furthermore, the second layer 312 has a second elliptical groove 326. The main axis GL of the second elliptical groove 326 is parallel to the axis AL1 of the movable rod 320. Thus, the rotating shaft of the large gear 350 can pass through the second elliptical groove 326 and be installed on the outer shell of the main body 100. During the sliding process of the large gear 350 driving the movable rod 320, the second elliptical groove 326 can cooperate with the rotating shaft of the large gear 350 to guide the sliding of the annular component 310, making the sliding of the annular component 310 more stable.

[0036] Reference Figure 1 In the above embodiments, the brush head 200 includes a fiber brush 210 connected by an intermediate rod 220. The end of the intermediate rod 220 is a connecting segment 230. One end of the movable rod 320 is connected to a connector. The connector connects to the connecting segment 230. Preferably, the connector and the connecting segment 230 are connected by a plug-in method. For example, the connecting segment 230 is a connecting sleeve. The connector can be inserted into the connecting sleeve to facilitate the installation of the brush head 200 and make the brush head 200 replaceable.

[0037] Interdental brushes require excellent sealing. To address this issue, most components of the present invention are encapsulated within a closed body 100, with only the connecting sleeve or movable rod 320 passing through the end of the body 100. The body 100 is divided into a rear half containing electrical and mechanical components and a front half housing the movable rod 320 or connecting sleeve, the two parts being separated by an intermediate chamber 150 to ensure a tight seal.

[0038] The movable rod 320 has at least one sealing ring, and preferably, the movable rod 320 has multiple sealing rings connected in series to ensure a seal between the movable rod 320 and the intermediate chamber 150. The sealing ring is typically a flat seal or an O-ring, and the seal is achieved by compression of the flat seal or deformation of the O-ring, which fills all available space reserved on the inner wall of the chamber.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An electric interdental brush, comprising a body and a brush head for insertion into interdental spaces connected by a movable rod, the body including a motor for controlling the vibration of the brush head, characterized in that: The axis of the motor output shaft forms an angle between 70° and 180° with the axis of the movable rod; The motor cooperates with the movable rod via a rotation-translation conversion mechanism, the rotation-translation conversion mechanism comprising: A large gear is parallel to a plane defined by the axis of the motor and the axis of the movable rod, and the large gear is driven by a small gear fixed to the output shaft of the motor; An annular component is fixed to one end of the movable rod. The annular component has a first elliptical groove, which cooperates with an eccentric protrusion on the transverse surface of the large gear.

2. An electric interdental brush according to claim 1, characterized in that, The axis of rotation of the large gear passes through the intersection of the axis of the motor output shaft and the axis of the movable rod.

3. An electric interdental brush according to claim 1, characterized in that, The reduction ratio between the pinion and the gear is between 1 / 3 and 1 / 6.

4. An electric interdental brush according to claim 1, characterized in that, The eccentric protrusion has an extension radius of R, the width of the first elliptical groove is between R and 1.2R, and the length of the first elliptical groove is greater than 2R.

5. An electric interdental brush according to claim 1, characterized in that, The angle between the axis of the motor output shaft and the axis of the movable rod is 120°±30°.

6. An electric interdental brush according to claim 1, characterized in that, The movable rod is axially movable, and the body has a chamber sealed by at least one annular seal and through which the movable rod passes.

7. An electric interdental brush according to claim 1, characterized in that, The annular component is formed by a molded part having a first layer and a second layer. The first layer has an elliptical cavity defining a first elliptical groove. The main axis of the first elliptical groove is perpendicular to the axis of the movable rod. The second layer is above the first layer, the movable rod is inserted into the second layer, and the second layer has a second elliptical groove with its main axis parallel to the axis of the movable rod. The rotation axis of the large gear passes through the second elliptical groove.

8. An electric interdental brush according to claim 1, characterized in that, The brush head has a connecting section, and one end of the movable rod is connected to a connecting piece, which connects to the connecting section.

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