JPH08117029A - Electrically driven tooth brush with rotating brush and shape of brush used to the device - Google Patents

Abstract

PURPOSE: To dispense with brushing by vibration and adopt brushing by rotation and also shape the brush to make a screw-form to smoothly brush even in the details. CONSTITUTION: A cell 2, a motor 3, a reducer 4, and a switch 8 are installed in a handle 1. A shaft 5 is attached thereto to transmit the rotation through the reducer and a brush 7 is attached to the front end thereof. The outer periphery of the brush 7 is shaped to make a screw-form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush for brushing teeth with a brush driven by an electric motor.

[0002]

2. Description of the Related Art In a conventional electric toothbrush, the brush portion vibrates alternately within an acute angle or reciprocally vibrates.

[0003]

In the conventional brush part which vibrates alternately within an acute angle, when contacting the gums,
Some people with periodontal disease or those with weak gums were bleeding or swollen by applying alternating vibrations in the direction of pressing down the gums and the direction of turning up the gums (directions a and b in FIG. 2). An object of the present invention is to rotate the teeth only in the direction in which the gums are pressed down (the direction in FIG. 3a) to eliminate vibration and brush the teeth by a rotary motion.

In the conventional brush movement, the force vector (30) does not work on the side surface of the tooth gap (for example, in the case of reciprocating vibration, the brush does not enter the tooth gap, but in the case of alternating vibration, the vector There was a problem that the side of the gap could not be polished cleanly. The present invention aims to improve the polishing by giving a force vector (30) also on the side surface of the gap.

[0005]

In order to achieve the above object, in the electric toothbrush of the present invention, the brush portion is rotated in a fixed direction, and the rotation can be fixed only in the direction in which the gums are pressed down (the direction in FIG. 3a). It was done like this.
Further, since the upper teeth and the lower teeth have different pressing directions, the polarity can be changed so that the rotation direction can be changed.

Further, by making the outer circumference of the brush into a screw shape (32), the screw thread in the portion in contact with the tooth moves left and right due to the rotation, so that when the screw thread is in contact with the tooth gap, A force vector (30) can also be applied to the side surface.

[0007]

[Function] When a rotating brush is applied to the boundary between the tooth and the gum (Fig. 3), the brush is pressed from above against the gum (Fig. 3).
As it is polished in the a direction), the gums do not turn or bleed. Further, the rotated brush has a force vector (30) on the side surface of the tooth even when it comes into contact with the gap between the teeth due to the screw shape provided on the outer periphery, and therefore works to increase the polishing force on the side surface.

[0008]

EXAMPLES Examples of the present invention will be described below. (A) Battery (2), electric motor (3), on the handle (1)
A speed reducer (4) and a switch (8) are provided. (B) Shaft for transmitting rotation from the reducer (5)
Is provided, and the brush (7) is provided toward the tip thereof. (C) The shaft is detachable by providing a joint (6) in the middle so that the brush part can be replaced. (D) If the switch is turned on, the electric motor will be driven, the shaft will transmit the rotation, and the brush (7) in front of it will rotate,
Brush the teeth by pressing the brush part against the teeth.

[0009]

According to the present invention, vibration can be eliminated only in the direction in which the rotation presses down the gum (direction in FIG. 3a). And since there is no force to turn up the gums, it is possible to provide an electric toothbrush that can be safely used by people with periodontal disease or people with weak gums.

Further, by forming the outer circumference of the brush into a screw shape (32), a force (30) acts on the tooth gap in the tooth gap, so that the tooth details can be finely polished.

[Brief description of drawings]

1 is a cross-sectional view of the present invention.

FIG. 2 is a diagram showing a conventional movement.

FIG. 3 is a diagram showing the operation of the present invention.

FIG. 4 is a diagram showing a brush shape and an action of force according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 handle 2 battery 3 electric motor 4 speed reducer 5 shaft 6 joint 7 brush 8 switch 9,10 bearing 21, 31 tooth 22 tooth gum 23 conventional brush 24, 32 brush 30 of the present invention force vector

Claims (2)

[Claims] 1. An electric toothbrush in which a brush (7) mounted at the tip of a shaft is rotated by driving a motor (3) by a battery (2) in a handle (1) and transmitting rotary motion by a shaft (5). 2. A brush shape used for the electric toothbrush according to claim 1.