WO2004098445A1

WO2004098445A1 - Electric toothbrush

Info

Publication number: WO2004098445A1
Application number: PCT/CN2004/000408
Authority: WO
Inventors: Xiaoguo Dai
Original assignee: Xiaoguo Dai
Priority date: 2003-05-09
Filing date: 2004-04-27
Publication date: 2004-11-18
Also published as: CN2614048Y

Abstract

The invention discloses an electric toothbrush, comprising a drive means (13), which is connected to a motor (15) and a driving shaft (11). The drive means (13) includes: a motor driving wheel (14), which is connected to the axis of the motor, an eccentric pin (18), which is eccentric to the driving wheel (14), and its vertical axis is parallel to the vertical axis of the driving wheel (14), and, a fork (19) which matched to the driving shaft (11) tightly on one end, and has a slot (219) on the other end. There is a music box (16) in the hand of the toothbrush. While the toothbrush rolling, the music box (16) can make euphonic sound. Further more, the music box can play user’s voice timely.

Description

Technical field

The utility model relates to an electric toothbrush, in particular to a driving mechanism of the electric toothbrush. Background technique

Existing electric toothbrushes generally include a grip portion and a brush body portion, and the brush body portion is detachably connected to the grip portion. The motor installed in the grip part drives the transmission shaft through a transmission mechanism, and the brush body part is provided with a rotatable shaft and a rotatable bristle holder. The above transmission shaft is connected to the rotation shaft installed in the brush body part through a connection mechanism. Connect with the bottom. The upper end of the rotating shaft of the brush body is connected to the bristle holder through another connecting mechanism.

The invention patent application with publication number CN 1044041 A describes a structure that uses a gear as a transmission mechanism to drive a transmission shaft. The transmission mechanism has a driving bevel gear driven by a motor, and the driving bevel gear meshes with a driven bevel gear. The driven bevel gear rotates around an axis extending in the transverse direction of the connecting rod, and an eccentric shaft parallel to the axis of the gear extends into the fixed part of the swing arm. The above-mentioned rocker arm is fixed on a rotating shaft which is axially movable and rotatable in the grip portion and extends longitudinally along the grip. This gear transmission has a complicated structure, large volume, large power loss, and low transmission efficiency.

The US patent US-PS 4827550 discloses a mechanism for connecting an electric toothbrush drive shaft and a brush body rotating shaft, wherein an end of the drive shaft adjacent to the brush body rotating shaft has an annular recessed area, the recessed area is close to the end of the drive shaft, Thereby, an end and a shoulder are formed facing the upper end of the grip portion. The tip is tapered at the end of the transmission shaft to facilitate insertion into the rotating shaft of the brush body. Because the volume of the brush body is small, it takes time to process such a cone-tip one-shoulder structure, so the production cost is increased.

The US patent US-PS 4156620 also discloses a mechanism for connecting a brush body part of an electric toothbrush with a bristle holder. The brush body has a rack link, and each of the bristle holders of the bristle holder is provided with a gear. All gears in a row of brush holders mesh with each other, and one of every two gears meshes with a connecting rod. Because there are many gears and the connecting rod is a rack, the structure is complicated and the volume increases. To prevent the gears from getting stuck, the allowable manufacturing tolerances are small, resulting in high manufacturing costs.

In the above-mentioned Chinese invention patent application with publication number CN 1044041 A, it is also disclosed that the brush body portion of the electric toothbrush is connected to the grip portion through a snap joint to achieve the disassembly of the brush body. This structure cannot guarantee the smooth operation of the brush body. Moreover, the locking joint is provided on the outside, which increases the volume of the toothbrush and causes inconvenience in use.

In addition, all existing toothbrushes have a single dentifrice function. For young children, brushing their teeth with a common toothbrush is a very boring task. Therefore, many young children do not like brushing their teeth, which is not good for cultivating their good habits of brushing their teeth.

The technical problem to be solved by the utility model is to try to overcome the complex structure, large volume, large power loss, and low rotation efficiency of the existing electric toothbrush gear transmission mechanism; the connection mechanism between the transmission shaft and the brush body rotation shaft has a complicated structure, difficult processing, The cost is high; the brush body rotates steadily, is bulky and inconvenient to use; it is not good for cultivating the good habits of young children to brush their teeth carefully. It provides a small size, simple structure, convenient processing and disassembly, smooth rotation of the brush body, low power consumption, An electric toothbrush that is inexpensive, easy to use, and contains teeth for entertainment.

The technical solution provided by the present utility model to solve the above problems is: The driving mechanism for connecting the motor and the transmission shaft includes a motor driving wheel connected to the motor shaft, and a longitudinal axis parallel to the longitudinal axis of the driving wheel and eccentric with respect to the driving wheel. An eccentric pin and a shift fork with one end closely matching the drive shaft and the other end having a slot, one end of the eccentric pin gauge is embedded in the driving wheel, and the other end is inserted into the slot of the shift fork.

In order to increase children's interest in brushing teeth, a music box can be installed in the handle part of the toothbrush. With the rotation of the toothbrush, the music box can emit pleasant songs or nursery rhymes or mother's caressing sounds, and it can also play its own language regularly. Record to remind users that brushing has been going on for some time.

A blind hole extending in the axial direction of the rotating shaft toward the inside of the rotating shaft and in the shape of a cross-head screw may be machined on the end surface of the brush body rotating shaft matched with the transmission shaft, and the round head of the blind hole is divided into an arc larger than a semicircle. The end of the transmission shaft near the end of the rotating shaft of the brush body is inserted into the blind hole, and the transmission shaft is directly connected to the rotating shaft of the brush body.

In order to reduce the volume of the toothbrush and make the brush body part rotate smoothly, a blind hole may be provided at the end of the brush body village interface with the grip portion, and an outward protrusion is provided along the radial side of the hole. At the center of the hole, at least one inward protrusion is provided on the side of the hole opposite to the above side. The handle interface corresponding to the outward protrusion of the blind hole also has an outward protrusion that matches the outward protrusion, and at least one inward protrusion that matches the inward protrusion of the blind hole on the opposite side. The diameter of the grip interface is smaller than the diameter of the hole in the inner liner of the brush. The end of the hollow support tube of the brush body part remote from the grip part is a pot-shaped mounting portion that is open to one side, and a driving bevel gear, a driven bevel gear, and a bristle holder are installed in the mounting portion. A blind hole is opened on the end of the rotating shaft of the brush body away from the handle. The center of the hole is located on the axis of the rotating shaft. One end of a connecting pin is coaxially tightly inserted into the blind hole. The other end of the connecting pin is the same A driving bevel gear is mounted on the shaft, and the above-mentioned connecting pin is closely matched with the driving bevel gear. A fixing pin is inlaid on the side wall of the pot-shaped mounting portion of the hollow support tube, and both the bristle holder and the driven bevel gear are rotatably mounted coaxially on the fixing pin. The driving bevel gear and the driven bevel gear mesh with each other. Their center angles are less than or equal to 90 °.

A groove parallel to the gear axis can also be machined on one side of the driven gear along its radial direction, and a protruding portion parallel to the axis of the bristle holder is protruded from the end face of the bristle holder at the mating end of the driven gear. Partially inserted into the above groove of the driven gear, two adjacent end faces of the driven bevel gear and the bristle holder are parallel to each other, so that the bristle holder and the driven bevel gear are rotated synchronously.

A groove can also be machined on the outer wall of one side of the bristle holder, and a restriction pin is inserted into the groove, and the other end of the restriction pin is fixed on the top wall of the pot-shaped mounting portion of the hollow support tube. , Can make the bristle holder limited movement along the axial direction of the fixed shaft.

The utility model adopts an eccentric pin and a slotted fork mechanism to drive the transmission shaft. The structure is simple, the processing is convenient, the volume of the brush body is reduced, the space is saved, the power loss is small, and the transmission efficiency is high. One is installed in the handle part of the toothbrush. With the rotation of the toothbrush, the music box's pleasant sound helps to cultivate children's strong interest in brushing their teeth and develop a good habit of children to brush their teeth carefully from an early age; the upper end of the transmission shaft is directly connected to the rotating shaft of the brush body, further reducing the power Loss, transmission efficiency is higher; the two sides of the interface between the brush body and the grip part are connected by a concave and convex structure, the brush body is easy to install and disassemble, and the brush body rotates more smoothly; and because the bevel gear meshing structure processed by casting or injection molding is selected, It also facilitates processing and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic longitudinal sectional view of the electric toothbrush according to the present invention;

Figure 2 is a schematic diagram of the connection between the motor drive mechanism and the transmission shaft;

Figure 3a is a schematic front view of a transmission shaft and a fork mounted thereon;

Figure 3b is a side view of Figure 3a;

Figure 3c is a top view of Figure 3a; 4 is a schematic longitudinal sectional view of a brush body portion of the electric toothbrush;

Figure 5a is a schematic longitudinal sectional view of the brush body rotating shaft mating end with the drive shaft;

Figure 5b is a sectional view taken along the line G-G of Figure 5a;

6a is a schematic longitudinal sectional view of a brush inner liner;

Figure 6b is a sectional view taken along line C-C of Figure 6a;

7 is a top view of the grip interface;

Figure 8a is a schematic longitudinal sectional view of a driven bevel gear;

Figure 8b is a schematic side view of a driven bevel gear;

Figure 9a is a schematic longitudinal sectional view of a bristle holder;

Fig. 9b is a schematic side view of a bristle holder.

The same reference numerals in the drawings denote the same components. detailed description

FIG. 1 is a schematic longitudinal sectional view of the electric toothbrush according to the present invention. The electric toothbrush according to the present invention includes a grip portion 22 and a brush body portion 1. The grip portion 22 includes a transmission shaft 11, a grip housing 12, a driving device 13, a motor 15, a music box 16, and a battery 17.

FIG. 2 is a connection diagram of the motor driving mechanism 13 and the transmission shaft 1 1. Figure 3a is a schematic front view of the transmission shaft 11 and the fork 19 mounted thereon; Figure 3b is a side view of Figure 3a; Figure 3c is a top view of Figure 3a, which shows the shape of the slot 219. The driving mechanism 13 connecting the motor 15 and the transmission shaft 11 includes a motor driving wheel 14 connected to the shaft of the motor 15 and an eccentric pin with a longitudinal axis parallel to the longitudinal axis of the driving wheel 14 and eccentric with respect to the driving wheel 14. 18 and a shift fork 19 having one end in close contact with the transmission shaft 11 and a slot 219 at the other end. One end of the eccentric pin 18 is inserted into the driving wheel 14 and the other end is inserted into the slot 219 of the shift fork 19.

Fig. 4 is a schematic longitudinal sectional view of the electric toothbrush brush body portion 1. The brush body part 1 includes a hollow support tube 2 in which a brush body rotating shaft 4 is installed. The rotating shaft 4 is connected to the motor driving mechanism 13 installed in the grip portion 22 through the transmission shaft 11 and the motor driving mechanism 13 is connected to the motor 15 Connected (see Figures 1, 2).

Fig. 5a is a schematic longitudinal sectional view of a brush body rotating shaft mating with a transmission shaft; Fig. 5b is a G-G sectional view of Fig. 5a. In order to reduce the power loss when the drive shaft 1 1 drives the brush body rotating shaft 4, the brush body A blind hole 51 1 is formed on the end surface of the end of the rotating shaft 4 that is matched with the transmission shaft 11 and extends along the axial direction of the rotating shaft 4 toward the inside of the rotating shaft 4. The head portion 512 has an arc shape that is larger than a semicircle, and the end of the transmission shaft 11 mated therewith is directly inserted into the blind hole 51 1.

Fig. 6a is a schematic longitudinal sectional view of the brush inner liner 3; Fig. 6b is a cross-sectional view taken along the line C-C of Fig. 6b. FIG. 7 is a top view of the grip interface 20. A blind hole 61 1 is provided at the end of the brush body lining 3 connected to the grip portion 22, and an outward protrusion 612 is provided along a radial side of the hole 61 1, and the protrusion 612 is located at the center of the hole 61 1. On the side of the hole 61 1 opposite to the above side, at least one inward protrusion 613 is provided (see FIGS. 6 a and 6 b). The corresponding side of the grip interface 20 corresponding to the outward protrusion 612 of the blind hole 61 1 also has an outward protrusion 712 matching the outward protrusion 612, and at least one inward side of the blind hole 61 1 is on the opposite side. The inward protrusion 713 (see FIG. 7) is matched with the protrusion 613. The diameter of the handle interface 20 is smaller than the diameter of the blind hole 61 1 in the brush body 3.

Because the inner sides of the brush body lining 3 and the two sides of the grip portion interface 20 are connected by a concave-convex structure (612, 613, 712, 713), the volume of the toothbrush is reduced, the brush body is easy to mount and dismount, and the brush body rotates more smoothly.

Looking again at FIG. 4, the end of the hollow support tube 2 of the brush body part 1 away from the handle part 22 is a pot-shaped mounting part knife which is open to one side, and is used to install the driving bevel gear 6 and the driven bevel gear 7 and the bristles. Bracket 9. A blind hole is opened at one end of the brush body rotating shaft 4 away from the handle portion 22, the center of the blind hole is located on the axis of the rotating shaft 4, and one end of the connecting pin 5 is coaxially tightly inserted into the blind hole. The other end of the connecting pin 5 is coaxially provided with a driving bevel gear 6, and the connecting pin 5 is closely matched with the driving bevel gear 6. A fixing pin 8 is inlaid on the side wall of the pot-shaped mounting portion 21 of the hollow support tube 2 of the brush body part 1, and the bristle holder 9 and the driven bevel gear 7 are coaxially mounted on the fixing pin 8 in a form of dynamic fit. That is, the driven gear 7 can rotate or move with respect to the fixed pin 8. The above-mentioned driving bevel gear 6 and driven bevel gear 7 mesh with each other, and their center angles are less than or equal to 90 ° (see FIG. 8b).

FIG. 8a is a schematic longitudinal sectional view of the driven bevel gear 7. FIG. 8b is a schematic side view of the driven bevel gear Ί. Fig. 9a is a schematic longitudinal sectional view of a bristle holder; Fig. 9b is a schematic side view of the bristle holder. In order to make the bristle holder 9 and the driven gear 7 rotate synchronously, a groove 811 (see Figs. 8a and 8b) parallel to the gear axis is machined radially on the driven gear 7-side. A protruding portion 91 1 (see FIGS. 8 a and 8 b) parallel to the axis of the bristle holder 9 is protruded from an end surface of the bristle holder 9 which is mated with the driven gear 7, and the protruding portion 911 is inserted into the slot of the driven gear 7. In 911, two adjacent end faces of the driven bevel gear Ί and the bristle holder 9 are parallel to each other, so that the bristle holder 9 and the driven The bevel gear 7 is synchronized. A groove 912 is processed on the outer wall of the bristle holder 9 side, and a restriction pin 10 is inserted into the groove 912, and the other end of the restriction pin 10 is fixed on the top wall of the pot-shaped mounting portion 21 of the hollow support tube 2, With this structure, the bristle holder 9 can be limitedly moved in the axial direction of the fixing pin 8.

When the motor 15 installed in the grip portion 22 drives the driving wheel 14 to rotate in the direction shown by arrow E through its output shaft (Fig. 2), the eccentric pin 18 with one end embedded in the driving wheel 14 follows the narrowing of the fork 19 The reciprocating movement in the groove 219 causes the transmission shaft 11 to reciprocate in the direction shown by the double-headed arrow A (FIG. 1, 2), and drives the brush body rotating shaft 4 to reciprocate in the direction shown by the two-way arrow A (FIG. 1, 4). Driven by the rotating shaft 4, the connecting pin 5 rotates accordingly, and the driving bevel gear 6 closely matching the pin 5 is rotated. The driven gear 7 is driven by the engagement of the driving gear 6 with the driven gear 7, so that the bristle holder 9 reciprocates in the direction shown by the bidirectional arrow B (Figs. 1, 4). Due to the restriction pin 10, the bristle holder 9 can be limitedly moved in the axial direction of the fixing pin 8.

The specific embodiments of the present invention have been described above with reference to the accompanying drawings. Obviously, the present invention is not limited thereto, and various modifications made within the scope of the present invention do not exceed the protection scope of the present invention.

Claims

Rights request

1. An electric toothbrush comprising a grip portion (22) and a brush body portion (1) with a lining (3), the brush body portion (1) being detachably connected to the grip portion (22) and mounted on The motor (15) in the grip portion (22) drives the transmission shaft (11) through a driving mechanism (13). The brush body portion (1) includes a hollow support tube (2) with a pot-shaped mounting portion (21) at one end. ), A rotatable shaft (4) is installed in the tube (2), and a driving bevel gear (6) and a driven bevel gear are installed in the pot-shaped mounting portion (21).

(7) and a bristle holder (9), characterized in that the driving mechanism (13) includes a motor driving wheel (14) connected to the shaft of the motor (15), and a longitudinal axis parallel to the driving wheel (14). The shaft is eccentric with respect to the drive wheel (14). An eccentric pin (18) and a fork (19) with a slot (219) on the other end are closely matched with the drive shaft (11) at one end. The above eccentric pin (18) One end is inserted into the driving wheel (14), and the other end is inserted into the slot (219) of the fork (19).

2. The electric toothbrush according to claim 1, characterized in that a music box (16) is installed in the grip portion (22).

3. The electric toothbrush according to claim 1 or 2, characterized in that: an end face of the end of the brush body rotating shaft (4) that cooperates with the transmission shaft (11) is machined with an axial direction along the rotating shaft (4). Shaft

(4) The internally extending blind hole (511) with a cross-section in the shape of a round head screw, and the round head portion (512) of the blind hole (511) has an arc shape larger than a semicircle, and a drive shaft (11) matched therewith End directly into the blind hole (511).

4. The electric toothbrush according to claim 3, characterized in that: a blind hole (611) is provided at an end of the brush body village (3) connected to the grip portion (22), and along a radial direction of the hole (611) An outward protrusion (612) is provided on one side of the hole, the protrusion (612) is located at the center of the hole (611), and at least one inward protrusion is provided on the side of the hole (611) opposite to the above side ( 613), the corresponding side of the grip interface (20) and the outward protrusion (612) of the blind hole (611) also have an outward protrusion (712) corresponding to the outward protrusion (612), and the opposite side There is at least one inward protrusion (3) matching the inward protrusion (613) of the blind hole (611), and the diameter of the grip interface (20) is smaller than the diameter of the blind hole (611) in the brush inner liner (3). .

5. The electric toothbrush according to claim 4, characterized in that: a blind hole is opened at one end of the brush body rotating shaft (4) away from the handle portion (22), and the center of the blind hole is located on the axis of the rotating shaft (4) on, One end of a connecting pin (5) is coaxially tightly inserted into the blind hole, and the other end of the connecting pin (5) is coaxially equipped with a driving bevel gear (6), and the connecting pin (5) and the driving bevel gear (6) Tight fit; a fixing pin (8) is inlaid on the side wall of the pot-shaped mounting portion (21) of the hollow support tube (2), and the bristle bracket (9) and the driven bevel gear (7) are engaged Is mounted coaxially on the fixed pin (8); the driving bevel gear (6) and the driven bevel gear (7) mesh with each other, and their center angles are less than or equal to 90 °.

6. The electric toothbrush according to claim 5, characterized in that a groove (811) parallel to the axis of the gear is machined on the side of the driven gear (7) along its radial direction, and from the contact of the bristle holder (9) with A protruding portion (811) parallel to the axis of the bristle holder (9) protrudes from the end face of the mating end of the driven gear (7), and the protruding portion (911) is inserted into the groove (811) of the driven gear (7). The two adjacent end faces of the driven bevel gear (7) and the bristle holder (9) are parallel to each other.

7. The electric toothbrush according to claim 6, characterized in that: a groove (912) is formed on the outer wall of one side of the bristle holder (9), and a restriction pin (10) is inserted into the groove (912). The other end of the restriction pin (10) is fixed on the top wall of the pot-shaped mounting portion (21) of the hollow support tube 2.