JP2804940B2 - electric toothbrush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor in which a brush is three-dimensionally movable by simultaneously driving a drive shaft on which the brush is mounted, in the axial direction and in the reverse direction around the axis. Related to toothbrush.

[0002]

2. Description of the Related Art Conventionally, there has been provided an electric toothbrush which converts a rotational movement of a motor into a oscillating motion, transmits the oscillating motion to a toothbrush, and oscillates the toothbrush. Such rocking movements include:
There are a type that swings the toothbrush in the axial direction, a type that swings in the direction around the axis, and a type that makes a circular motion in only one direction. These operations are selectively used by switching with a changeover switch.

[0003]

An apparatus that swings a toothbrush in the axial direction has a disadvantage that it is difficult to polish between teeth. In addition, the one that swings the toothbrush in the axial direction can polish the tooth surface and between the teeth, but it is not only difficult to polish between the teeth and the gums where plaque easily accumulates,
There was a problem that the gums were easily damaged. Furthermore, the circular movement of the toothbrush is a rotation in one direction and cannot be effectively polished. The present invention has been made to solve such a problem, and the brush is swung three-dimensionally to effectively brush the boundary between the teeth and the gums and between the teeth. And an electric toothbrush that does not damage the gums.

[0004]

In order to solve the above problems, the present invention has the following arrangement. A drive shaft provided with a brush at one end, a motor for driving the drive shaft,
In an electric toothbrush including a motor and a casing accommodating the drive shaft, a first face gear having an eccentric cam rotated by the motor and reciprocating the drive shaft in the axial direction is provided. . This first
And a second face gear having an eccentric cam for reversingly moving the drive shaft at a constant angle around the axis of the drive shaft. This first
Movement by the face gear and the second face gear,
At the same time, the electric toothbrush was obtained by transmitting the electric toothbrush to the drive shaft.

[0005]

By arranging the first face gear and the second face gear to face each other, the rotation of the motor can be simultaneously transmitted to these gears via the pinion. Also, the movement of the eccentric cam provided on the first face gear and the movement of the eccentric cam provided on the second face gear,
By transmitting the brush to the drive shaft at the same time, the brush provided at one end of the drive shaft performs three-dimensional movement.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. The toothbrush 2a brushes the teeth while inverting movement. The brush 4 is attached to one end of a long handle 2 made of a synthetic resin such as plastic, and the brush made of nylon or the like. A plurality of hairs are planted. The toothbrush 2a is detachably fitted to the tip of the drive shaft 3. A waterproof rubber 17 is provided at the upper end of the casing 1, and the drive shaft 3 is attached to a center hole of the casing 1.
Water is prevented from entering inside. A motor 20, a battery 21, and a drive mechanism 24 are built in the casing 1 by a chassis 22, and a switch 18 is provided at the lower end of a switch 18 on the peripheral side of the casing 1. The drive shaft 3 is pivotally supported by a bearing 16 provided in the casing 1 and is oscillated by a drive mechanism 24. The first drive mechanism 24 is a first drive mechanism that is rotated by the motor 20.
Second face gear 7 disposed opposite to the second face gear 5
And a cam floor shaft 9 arranged between these face gears and swinging by the respective face gears.
The first face gear 5 and the second face gear 7 are arranged such that a face gear shaft 15 is disposed at the center of rotation thereof and both ends thereof are attached to the chassis 22 so that the face gears are opposed to each other. In, it is set to rotate. The drive mechanism 24 will be described in more detail.

As shown in FIG. 4, the first face gear 5
Has a gear that goes around the periphery of the disk surface, and the eccentric cam 6 is provided at a position shifted from the center of the disk. One end of the face gear shaft 15 is inserted into the plane portion of the eccentric cam 6 at a position that becomes the rotation center of the first face gear. The first face gear 5 formed in this way rotates by fitting a gear provided on the periphery thereof with a pinion 19 provided on the rotation shaft of the motor 20. Similarly to the first face gear 5, the second face gear 7 is provided with a gear at a peripheral portion, and an eccentric cam 8 at a position shifted from the center of the disk. The other end of the face gear shaft 15 is inserted into the plane portion of the eccentric cam 8 at a position that becomes the rotation center of the second face gear.

The first face gear 5 and the second face gear 7 are arranged so that their gear portions face each other, and the gear provided on the second face gear 7 is the first face gear 5 and the second face gear 7. Like the face gear 5, it is simultaneously rotated by a pinion 19 provided on the rotation shaft of the motor 20. A first face gear 5 disposed opposite to the second
If the face gear 7 has the same diameter,
The face gear shaft 15 may be a straight line. However, as shown in FIGS. 3 and 4, when either diameter is changed, the face gear shaft 15 is bent into a crank shape in order to rotate each face gear with the same pinion 19. Will be. By changing the diameter of the first face gear and the second face gear or changing the number of gears, the swinging state of the brush changes, which will be described later.

The above-described cam floor shaft 9 will be described with reference to the drawings. FIG. 5 is a perspective view showing a cam floor shaft,
FIG. 6 is an explanatory view showing a part of the drive mechanism shown in FIG.
When the first face gear 5 and the second face gear 7 rotate, the cam floor shaft 9 abuts the eccentric cams provided on the respective cam gears and swings. It is provided integrally at the end. As shown in FIG. 5, the cam floor shaft has an elliptical frame and an elongated hole 10 provided in an upper portion of the frame. The longitudinal direction of the oval frame and the drive shaft 3 are arranged in a T-shape in directions orthogonal to each other. Therefore, when the first face gear 5 disposed in the frame rotates, the eccentric cam 6 does not come into contact with the longitudinal direction of the frame, and the inner sides of the drive shaft 3 perpendicular to the longitudinal direction are not in contact with each other. The drive shaft 3 is reciprocated in the axial direction by contacting the surface.

An elongated hole 10 provided above the cam floor shaft 9
Have the respective opposing surfaces as surfaces on which the eccentric cam comes into contact. An eccentric cam 8 provided on the second face gear 7 abuts on this surface, and causes the cam floor shaft 9 to roll. By this movement, the drive shaft 3 rotates at a fixed angle, and reciprocates the brush part 4 around the axis.

According to the drive mechanism 24 constructed as described above, the motor 20 is rotated by the operation of the switch 18, and the pinion 19 disposed on the motor shaft as shown in FIG.
The first face gear 5 and the second face gear 7 are simultaneously rotated. By the rotation of the first face gear, the eccentric cam 6 provided integrally with the first face gear comes into contact with the inner wall surface in the cam floor shaft 9 and the drive shaft 3
Is reciprocated in the axial direction. The eccentric cam 8 provided on the second face gear contacts the surface of the long hole 10 of the cam floor shaft 9 to reciprocate the drive shaft 3 in a direction around the axis at a constant angle. The cam floor shaft 9 is swung in a three-dimensional direction by such both movements, and this movement is transmitted to the brush unit 4 via the drive shaft 3.

FIG. 7 shows a toothbrush 2a of the present invention.
And shows the movement of the brush portion 4 of the present invention, and shows the rotation speed ratio of a face gear for oscillating motion in the axial direction, a face gear for oscillating motion with the eccentric cam and the axis, and an eccentric cam.
The left is the axial direction and the right is around the axis. For the symbol ↑ ↓ ← →, ↑
↓ indicates the maximum swing in the axial direction and ← → indicates the maximum swing around the axis.

In FIG. 8, the rotation speed ratio is 1:
To further explain the movement of 1.5, if the brush part 4 is started at the time of the symbol ← ↓ maximum swing, the direction changes at two-thirds → time, and the circle moves to the time ← time together with the centrifugal force, ↓ →
At this time, the number of axial swings is 1, while the number of axial swings is 1.
It becomes 5, and is repeated in this orbit.

In FIG. 9, the trajectory of the swinging reversal movement is shown on the teeth, and the boundary between the teeth and the gums and between the teeth are effectively polished together.

As described above, according to the present invention, the following effects can be obtained by simultaneously providing the drive shaft for moving the brush in both the axial direction and the direction around the axis. did it. That is, the teeth can be effectively brushed by swinging over three dimensions while inverting the brush. The drive mechanism of the present invention that swings the brush can change the swing trajectory by changing the rotation speed of the face gear, the amount of movement of the eccentric cam, etc., so that an appropriate toothpaste movement according to the purpose is selected. be able to. As in the conventional example, the brush moves three-dimensionally without the need to switch for each movement of the brush.
It was possible to obtain effects such as the ability to easily brush the teeth without worrying about the direction and angle of the brush applied to the teeth.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an electric toothbrush of the present invention.

FIG. 2 is an explanatory view showing a cross section of a main part of FIG. 1;

FIG. 3 is a perspective view showing a driving mechanism.

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is a perspective view showing a cam floor shaft.

6 is an explanatory diagram showing a cross section of the drive mechanism shown in FIG.

FIG. 7 is an explanatory diagram showing a locus of the swinging movement of the brush and a direction of the brush.

FIG. 8 is an explanatory diagram showing a locus and a brush direction of another example.

FIG. 9 is a toothbrush trajectory diagram shown in the above tooth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Handle part 2a Toothbrush 3 Drive shaft 4 Brush part 5 First face gear 6 Eccentric cam 7 Second face gear 8 Eccentric cam 9 Cam floor shaft 10 Slot 15 Face gear shaft 16 Bearing 17 Waterproof rubber 18 Switch 19 Pinion 19a Output shaft 20 Motor 21 Battery 22 Chassis 23 Lid 24 Drive mechanism

Claims (1)

(57) [Claims] A drive shaft provided at one end with a brush formed by implanting a plurality of bristles on a handle; a motor for driving the drive shaft; and a casing accommodating the motor and the drive shaft. An electric toothbrush, comprising: a first face gear provided with an eccentric cam rotated by the motor and reciprocating the drive shaft in an axial direction thereof; A second face gear provided with an eccentric cam for reversing the shaft at a constant angle in a direction around the axis, and a second face gear disposed between the second face gear and the first face gear; An electric toothbrush comprising a cam floor shaft which is three-dimensionally swung by the movement of an eccentric cam provided on a face gear and the movement of an eccentric cam provided on the second face gear, and transmits the swing to the drive shaft. .