JPS6182705A - Electromotive toothbrush - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 74D toothbrush with high brushing effect.

[Conventional technology]

Conventional electric toothbrushes have a drive unit built into the main body that is held.
)llffl structure, and was configured to roll the toothbrush attached to the drive shaft within an angle range of about 60''.

[Problem that the invention seeks to solve]

However, in the conventional method of swinging a toothbrush, the tips of the bristles B on the toothbrush A move in a large arc as shown in Figure 10, so the bristles B sweep the surfaces of the teeth C, gums D, etc. As a result, teeth C and gums D
It was difficult to remove plaque and other stains from the small recesses F between the teeth and the small gaps and recesses between the teeth.

(Suggestions for Solving the Problems) As a manual device for solving the above problems, the present invention provides an eccentric mechanism that rotates the above drive mechanism, which is built into the main body and has a toothbrush attached to its drive shaft. Along with having a shaft,
The structure includes a support member that supports the drive shaft, and the drive shaft is caused to move circularly via the eccentric shaft of the drive shaft.

[Effect]

This electric toothbrush moves the toothbrush in a circular motion along the bristle tip surface of the toothbrush without shaking the toothbrush, so the bristle tip constantly changes its direction and connects with the teeth and gums. During this period, dirt can be removed by brushing the tooth surfaces, the interlocking surfaces of the teeth, etc., and the brushing effect can be improved.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 8.

In the figure, reference numeral 1 denotes a cylindrical resin main body with a thickness and length that can be firmly held by hand, and the rear end opening is closed with a removably screwed N2.

This main body 1 has a built-in driving mechanism 3, and
A battery 4 that serves as a power source for this low structure 3 is housed. Electric?
T! A dry battery or a storage battery is used at 24, and this embodiment uses a dry battery that is inserted and taken out by opening and closing the lid 2, and 5 in FIG. 1 indicates a battery pressing spring.

The drive mechanism 3 is constructed as shown in FIGS. 1 to 7. That is, 6 is a motor that is operated by applying electric power from the battery 5, and a drive bevel gear 7 is attached to its output shaft. This gear 7 has intermediate gold teeth]i8
are meshed with each other, and an intermediate spur gear 9 is fixed to this gear 8.A driven spur ω10 serving as an eccentric shaft is meshed with the intermediate spur gear 9. Hey, 11.1 in the diagram
2 are @m axes, the gear shaft 11 supports the gear 8.9, the gear shaft 12 supports the gear 10, and these shafts 11, 12 are gears fixed to the inner surface of the main body 1. It is supported by a base 13. Further, an eccentric shaft 14 is protruded from the driven spur tooth 10 at a position eccentric from its center, and this shaft 14 is rotated by an engaging portion 16 consisting of a hole or the like formed in a drive shaft 15 made of resin or the like. Possibly engaged. Drive shaft 1
5 is provided to pass through a through hole 17 provided in the main body 1, and its tip protrudes from the tip of the main body 1. Further, the drive shaft 15 is elastically supported on both right sides by support members 18. In addition, in this embodiment, in order to reduce the number of parts, thin, approximately V-shaped portions that can be elastically deformed are integrally provided on both left and right sides of the drive shaft 15, and these extending portions are provided as described above. A case where the support member 18 is used is shown, and
In the figure, reference numeral 19 denotes a support member 18 provided integrally with the main body 1.
This is a support shaft that engages and supports the bent engagement portion at the end of the support shaft.

Drive DI in drive mechanism 3 with the above configuration! A toothbrush 20 is removably attached to the protruding end of the main body 1 of the toothbrush 1k15. Needless to say, the toothbrush 20 is formed by implanting brush bristles 22 at the tip of a handle 21. The amount of displacement due to rotation of this toothbrush 20 is 3 to 7#I.
Therefore, the eccentricity 1 of the drive shaft 14 with respect to the center of the driven spur gear 10 is set to 1.5 to 3.5.

In addition, 23 in FIG.
It is provided to cover the protruding part from.

When the motor 6 of this electric toothbrush is energized and operated normally, the rotation of the drive bevel gear 7 is transmitted to the intermediate spur gear 9 through meshing with the intermediate full teeth M8, and then The transmission is transmitted to the driven spur gear 10 through meshing with the gear 10, causing the gear 10 to rotate.

Therefore, the heartbeat 14 performs an eccentric circular motion with a radius of the eccentricity 1 while causing slippage between the inner surface of the engaging portion 16 of the drive shaft 15, and the eccentric shaft 14 and the engaging portion 16 Through the engagement, the drive shaft 15 performs a circular motion with a displacement of 2B of the eccentricity 1. In other words, the entire toothbrush 20 is moved in a circular motion along the brunt of the bristles 22 by a displacement of 3 to 7 degrees. For example, assuming that the rotation direction is counterclockwise, the operation of the support member 18 accompanying one rotation of the drive shaft 15 in that case is shown in order from FIGS. 4 to 7, and these support members 18 are All of them are elastically deformed and repeatedly bent and expanded/contracted, and the biasing force of these support members 18 prevents the drive shaft 15 from falling down, thereby realizing the above-mentioned circular motion. In this way, the brush bristles 21 of the toothbrush 20, which are moved in a circular motion, are lightly pressed against the teeth, etc., so that the teeth can be brushed.

In this tooth brushing, the direction of the brush bristles 22 relative to the teeth constantly changes due to the circular movement of the toothbrush 20 along the bristle direction of the bristles 22, so that not only the chewing surfaces of the teeth, the surfaces of the teeth and gums, but also the surfaces between these Can clean small crevices and gaps.

Moreover, in this embodiment, since the rotational displacement position of the toothbrush 20 is 3 to 7M, the brush bristles 22
The handle 21 side of each bristle is rotated from the position indicated by the solid line to the position indicated by the two-dot chain line in the figure, but the tip of the bristles is pressed against the tooth surface, etc., so it is not rotated over a large range, but only within a small range. Rotate finely. Food particles, plaque, and other stains can be dug up and easily removed by the scratching action of the bristles in the recesses and gaps based on such fine rotation. In addition, if the amount of rotational displacement of the toothbrush 20 is made larger than 7 degrees, the tendency of the brush bristles 22 to sweep the teeth increases, and the brush bristles 22 easily pass through the above-mentioned small recesses, etc.
Also, if the above displacement amount is lowered by 3aug, the brush bristles 2
There is a greater tendency for the tips of the bristles 2 to move in the same manner as the handle 21 of the toothbrush 20, and in any case, the brushing effect is reduced.

Although the above-mentioned embodiment is constructed as described above, in the present invention, a fill spring may be used for the support member 18 of the drive tlllR structure 3 as shown in FIG. 9. Also,
An eccentric shaft 14 is provided protruding from a drive shaft 15, and an engaging portion (in addition, it may be formed by a recessed portion, which is limited to a through hole) with which this shaft 15 engages is provided on the eccentric shaft so as to protrude from the drive shaft 15. Good too. Furthermore, it goes without saying that the present invention can also be applied to electric toothbrushes of the type that use a commercial AC power source via a cord as a power source. In addition, in carrying out the present invention, the specific structure, shape, position, material, etc. of the main body, drive mechanism, drive shaft, eccentric shaft, support member, toothbrush, etc. will not be changed as described above unless it is contrary to the gist of the invention. It goes without saying that the present invention is not limited to the embodiments and can be configured and implemented in various ways.

〔Effect of the invention〕

At the above time 1t! According to the present invention, which has the constitution described in the claims, since the direction in which the brush bristles come into contact with the tooth surfaces, engagement surfaces, etc. constantly changes, it is possible to provide an electric toothbrush with a high brushing effect.

[Brief explanation of the drawing]

1 to 8 show one embodiment of the present invention, in which FIG. 1 is a vertical sectional side view, FIG. 2 is a sectional view taken along line I Perspective views of part of the structure, Figures 4 to 7
The figure is an explanatory diagram showing the rotational displacement of the drive shaft in order, and FIG. 8 is an explanatory diagram showing the relationship between the tip of the brush bristles and the amount of displacement. FIG. 9 is a perspective view showing another embodiment of the drive mechanism. FIG. 10 is an explanatory diagram showing the relationship between the movement of the bristles and the teeth of a conventional electric toothbrush. 1... Main body, 3... Separate drive unit, 16... Eccentric shaft,
DESCRIPTION OF SYMBOLS 15... Drive shaft, 18... Support member, 20-... Toothbrush, L... Displacement amount. Applicant's agent Patent attorney Takehiko Suzue N3 drawing 4 drawing 5 drawing

Claims (1)

[Claims] In an electric toothbrush in which a toothbrush is attached to a drive shaft of a drive mechanism built into the main body, the drive mechanism includes an eccentric shaft that rotates eccentrically, and a support member that supports the drive shaft, and the drive mechanism includes a support member that supports the drive shaft, and An electric toothbrush characterized by a drive shaft that moves in a circular motion.