JPH09322822A - Motor toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satisfactory polishing effect with a small turning force motor in a toothbrush. SOLUTION: A cylindrical brush 1 planting spirally a few bristles therein is rotated by a motor 2 in a motor brush. The motor toothbrush can polish teeth along parts between the teeth c drawing a circular track perpendicular to the polished surface by the rotation of the motor 2 received in a stem 7 constituted from a cover 6 uniting a bearing 4 supporting the cylindrical brush 1 and a hollow shaft 5. A drive mechanism is provided which eliminates the stop phenomenon and vibration of the bristle tip b, further has a sharp polishing effect such as preventing the uneven polishing and scaling out residual food and sordes on teeth.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric toothbrush, and more particularly to a structure for obtaining a polishing effect with a small rotational force and a related drive mechanism.

2. Description of the Related Art Conventionally, as a device of this type, there is one in which a pedestal a in which hairs are planted is driven back and forth or left and right as shown in FIG. 7, and further, as shown in FIG. There is one in which the hair tip b rotates around. The former is effective when the bristles b are hard and are in light contact with the tooth c surface, but when the bristles b are pressed against the tooth c or the interdental part d, the amplitude motion of the pedestal a is elastic. Absorbed by the part of the hair that has hair and b
Had the drawback that it would be in a stopped state. In order to avoid this, Japanese Patent Publication No. 3-54 was invented to drive the pedestal a with the tips b.
However, depending on the polishing direction and the handling method, there is a problem that polishing cannot be performed at all. Even with the latter planar rotary toothbrush, the drive of the bristles b does not follow the interdental part d,
With a large number of flocked hairs, there is a problem that the bristle tips b do not easily enter the interdental part d.

The polishing action of the electric toothbrush depends on the load applied to the bristle tip b, the driving direction of the bristle tip b and its amplitude as shown in FIGS. In order to obtain a large polishing effect with a small motor 2 (rotational force), it is necessary to reduce the number of bristle tips b in contact with the tooth c and the interdental part d to minimize the area. Further, the amplitude motion of the pedestal a is not absorbed by the bristles b, and the bristles b are driven along the tooth c and the interdental part d, so that not only the polishing spots are eliminated but also the discomfort due to vibration is eliminated and a quick finish is achieved. There is a need.

[Means for Solving the Problems] In order to eliminate the phenomenon of hair tip b stoppage and polishing unevenness, to obtain a large polishing effect with a small rotating force, and to further eliminate discomfort due to vibration, a small number of hairs are planted in a spiral shape. The bristles b of the cylindrical brush 1 are rotated by the motor 2 along the tooth c and the interdental portion d.

The rotation of the motor 2 is transmitted to the cylindrical brush 1 via the shaft 3 and the rotation causes the bristles b to rotate while brushing the surface of the tooth c from b to b'as shown in FIG. At that time, the bristle tip b moves to the spatula b ′ while polishing along the parallel interdental part d. At this time, the bristle tip b draws a circular orbit, and a smooth and intense polishing effect is obtained so as to scratch out food residues and plaque adhering to the tooth c and the interdental part d without vibration.

EXAMPLES The present invention will be described below with reference to examples. For example, as shown in FIG. 1, the handle 7 is molded of synthetic resin, and the motor 2 and the battery 8 are fixed. (Power can be supplied from the AC adaptor if necessary.) The rotation of the motor 2 has a structure in which it rotates normally or reverses only while the switch 9 or 9'is pressed as shown in FIG.
To replace the brush to be discarded, the rotating part of the motor 2
The structure is such that it can be easily attached to and detached from the shaft 3 of the cylindrical brush 1. A cylindrical brush 1 is formed by arranging elastic nylon threads or the like in a plane and twisted in a spiral shape with a wire, and a portion of only the wire is the shaft 3. The cylindrical brush 1 passes a shaft 3 through a hollow shaft 5 that is integrated with a cover 6, and supports the shaft 4 with a bearing 4. In the case of using the electric toothbrush of the present invention, first, the handle 7 is gripped, the cylindrical brush 1 is put in the mouth, and the bristle tip b is pressed against the tooth c between the teeth c to be ground, and the switch is switched according to the polishing position. When 9 or 9'is pressed, the motor 2 continuously rotates in the forward or reverse direction. At this time, the bristles b are as shown in FIG.
Since the number of teeth is small, the elasticity is large, and the contact area is small, the tooth c enters along the shape of the tooth c interdental part d to be polished and rotates from b to b'or from b'to b. It operates to scrape out food residues and plaque that adhere to the space d. The bristle tip b is planted in a spiral shape so that the load applied to the motor 2 is small, the rotation is smooth, the vibration does not occur, and the polishing spots do not occur. The bristles b other than the polishing surface are covered with the cover 6, and do not give discomfort during use. When finishing the polishing, remove the finger from the switch 9 or 9 ', stop the rotation of the cylindrical brush 1 and take it out from the mouth, put the cylindrical brush 1 in the water put in a cup or the like, and switch 9 or 9'. Is pressed with a finger, and the cylindrical brush 1 is rotated to remove food residues and plaque attached by centrifugal force. When the cylindrical brush 1 is worn, the hollow shaft 5 is removed from the handle 7 and replaced with a new cylindrical brush 1. When the battery is exhausted, the cap on the handle 7 can be removed and replaced with a new one, and an AC adapter can be used if necessary.

As described above, the present invention has various effects, but the structure of this embodiment produces the following effects. Conventionally, the hair was transplanted as shown in FIG. 5 and FIG. 6, but as shown in FIG.
Driving the bristles b in a fixed direction not only reduces the load on the motor 2 and increases the load applied to the bristles b to improve the polishing efficiency, but also the vibration caused by the reciprocation of the pedestal a and the bristles b.
The stop phenomenon of is eliminated. Further, along the tooth c and the interdental part d, the hair tips b are driven while drawing a circular orbit perpendicular to the polishing surface to cause food residues and plaque. Further, by operating the switch 9 or 9 ', not only the trajectory direction can be changed, but also the bristle tip b can be prevented from falling in one direction.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view

FIG. 2 is an enlarged view of a hair tip b.

FIG. 3 is a sectional view taken along the line A-A ′ in FIG.

[Fig. 4] Electrical diagram

[Figure 5] Functional explanation diagram

[Fig. 6] Functional explanatory diagram

[Figure 7] Functional explanation diagram

[Figure 8] Functional explanation diagram

[Explanation of symbols]

 1-Cylindrical brush 2-Motor 3-Shaft 4-Bearing 5-Hollow shaft 6-Cover 7- Handle 8 ... Battery 9 ... Switch 9 '... Switch a ... Pedestal b ... Hair tip c ... Tooth d. Interdental part → ・ ・ ・ ・ ・ Rotation, amplitude direction ← ・ ・ ・ ・ ・ Rotation, amplitude direction

Claims (1)

[Claims] 1. A cylindrical brush 1 having a small number of bristles planted in a spiral shape.
In an electric toothbrush that is rotated by a motor 2, the rotation of the motor 2 housed in a handle 7 is composed of a bearing 4 that supports the cylindrical brush 1 and a cover 6 that integrates a hollow shaft 5. , Electric toothbrush that can be continuously polished in a certain direction