JP2008148839A - Motor-driven toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven toothbrush capable of dissolving an unpleasant feeling due to vibrations, improving operability inside the mouth, and keeping a bristle implanted part sanitary. <P>SOLUTION: The motor-driven toothbrush 1 comprises: a holding part 2 with a built-in driving mechanism 6; the bristle implanted part 3 where a brush 5 is implanted; and a neck part 4 disposed between the holding part 2 and the bristle implanted part 3, in which the drive shaft 25 of the driving mechanism 6 is inserted to the inside. The bristle implanted part 3 comprises: an annular fixed part 10 fixed to the neck part 4 and provided with a penetrated void 10a; and a movable part 11 disposed inside the void 10a and moved by the transmission of power from the driving mechanism 6 through the drive shaft 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric toothbrush.

Conventionally, various electric toothbrushes have been provided in which a flocked portion in which a brush is implanted reciprocates or reciprocates.
As a conventional electric toothbrush, for example, there is one in which a motor is built in a gripping part (main body) gripped by a user, and the entire head is moved by this motor. The “head” referred to here is a part composed of a flocked portion and a neck portion laid between the gripping portion and the flocked portion (see, for example, Patent Document 1).

  Moreover, as a conventional electric toothbrush, there is one in which only the brush portion of the flocked portion is movable. More specifically, there is a configuration in which an outer shell portion having a concave cross section is provided at the tip of the neck portion, and a flocked base in which brushes are implanted is fitted into the outer shell portion. In this electric toothbrush, the outer shell is fixed to the tip of the neck, and the flocking base is movable (see, for example, Patent Document 2).

  Some conventional electric toothbrushes can move only a part of the brushes. If it demonstrates concretely, there exists a thing of the structure by which the movable flocking part which rotationally moves was arrange | positioned in the middle of the fixed flocking part fixed to the front-end | tip of a neck part. In this electric toothbrush, the outer brush planted in the fixed flocking portion does not move, and the inner brush planted in the movable flocking portion moves (for example, see Patent Document 3).

Further, as a conventional electric toothbrush, there is a brush portion of the flocked portion that is divided into a plurality of portions, and each of the plurality of brush portions is movable (swinging, reciprocating, rotating, etc.) (see, for example, Patent Document 4). ).
JP 52-4358 A JP-A-5-146314 JP 2000-210307 A JP-T-2006-513827

However, in the above-described conventional electric toothbrush in which the entire head is movable, there is a problem that the vibration of the head is transmitted and the user feels uncomfortable when the neck portion or the flocked portion touches the gums or cheeks.
In addition, in the above-described conventional electric toothbrush in which only the brush portion is movable, a part of the drive mechanism such as a rack and a pinion is provided in the hair transplantation portion, so that the thickness of the hair transplantation portion is large and the intraoral operability is improved. There is a problem of being inferior. In addition, there is a problem that wastes clogged between the outer shell portion and the flocked base are difficult to remove and easily become unsanitary.
Further, in the above-described conventional electric toothbrush in which only a part of the brush is movable, a part of the drive mechanism such as a gear is provided in the hair transplantation part, so that the thickness of the hair transplantation part is large and the oral operability is inferior. There is a problem.
In addition, in the above-described conventional electric toothbrush in which the brush portion of the flocked portion is separated into a plurality of movable parts, a part of the collar or other drive mechanism is provided on the flocked portion, so the thickness of the flocked portion is large. Therefore, there is a problem that the operability in the oral cavity is inferior.

  The present invention has been made in consideration of the above-described conventional problems, and provides an electric toothbrush that can eliminate discomfort caused by vibration, improve operability in the oral cavity, and can keep the flocked portion hygienic. It is aimed.

  The electric toothbrush according to the present invention includes a gripping part having a built-in driving mechanism, a flocking part in which a brush is implanted, and a driving shaft of the driving mechanism built between the gripping part and the flocking part. An electric toothbrush comprising: a neck portion through which the flocked portion is fixed to the neck portion, and has an annular fixed portion having a penetrating gap; It is characterized by comprising a movable part that is movable when power is transmitted from the drive mechanism via a drive shaft.

  Due to such characteristics, when the drive mechanism is operated, power is transmitted to the movable portion in the inner peripheral portion of the flocked portion via the drive shaft, and the movable portion is moved. On the other hand, the fixed part in the outer peripheral part of the flocked part is fixed and does not move.

In the electric toothbrush according to the present invention described above, it is preferable that the movable portion is configured to swing and / or reciprocate in the toothbrush long axis direction around the long axis of the toothbrush.
The “toothbrush major axis” herein refers to the axis of the flocked portion extending in the longitudinal direction of the electric toothbrush.

The electric toothbrush according to the present invention, it is preferable planar area of the gap is in the range of 0.20~1.50cm ^2.
In the electric toothbrush according to the present invention, it is preferable that the plane area of the movable part is smaller than 95% of the plane area of the gap.
In the electric toothbrush according to the present invention, it is preferable that a brush having a tapered tip is implanted in at least a part of the flocked portion.

According to the electric toothbrush according to the present invention, the drive mechanism is built in the gripping part, and the flocking part is configured such that the movable part is disposed in the gap through which the fixed part passes. The thickness dimension of a part becomes small and it becomes a compact flocked part. Thereby, intraoral operativity can be made favorable.
Further, since the movable portion is disposed in an island shape inside the annular fixed portion, vibration due to the movement of the movable portion is hardly transmitted to the gums, cheeks, and the like. Thereby, the discomfort by vibration can be eliminated.
Furthermore, since the movable part is disposed in the gap through which the fixed part penetrates, the gap between the movable part and the fixed part penetrates, and the wastes and the like clogged in the gap are easily washed away. Thereby, a flocked part can be kept hygienic.

  Hereinafter, first to third embodiments of an electric toothbrush according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, the first embodiment will be described.
Fig.1 (a) and FIG.1 (b) are the figures showing the external appearance of the electric toothbrush 1 in 1st Embodiment.
As shown in FIGS. 1 (a) and 1 (b), the electric toothbrush 1 includes a gripping part 2 gripped by a user, a flocking part 3 in which a brush 5 is implanted, a gripping part 2, and a flocking part 3 It is comprised from the neck part 4 erected between.

  The shape of the grip portion 2 can be changed as appropriate, but is generally formed in a long bar shape on one side so that the user can easily grip it. In addition, as needed, you may make a part of the holding part 2 uneven | corrugated, or make the holding part 2 whole the shape which curved. The inside of the grip part 2 is hollow, and a drive mechanism 6 for moving a movable part 11 to be described later is built in the grip part 2.

  The neck portion 4 protrudes from one end portion of the grip portion 2. The neck part 4 may extend in the direction of the axial extension line of the grip part 2 or may be bent with respect to the direction of the axial extension line. The shape of the neck 4 can be changed as appropriate, but normally the base end side (gripping part 2 side) is thick and the distal end side (flocked part 3 side) is thin. Further, the neck portion 4 may be detachably attached to the grip portion 2 or may be integrated with the grip portion 2. The interior of the neck 4 is hollow, and the drive shaft 25 of the drive mechanism 6 is inserted into the neck 4.

  The flocked part 3 is provided at the tip of the neck part 4. In the present embodiment, the flocked portion 3 is provided so as to extend straight with respect to the neck portion 4, but may be provided in a bent state with respect to the neck portion 4. Moreover, in this Embodiment, although the planar shape of the whole hair transplant part 3 is a shape long in the direction of the toothbrush long axis O, a perfect circle shape may be sufficient.

2A and 2B are cross-sectional views taken along the line AA shown in FIG. In the present embodiment, a surface viewed from the surface (hereinafter referred to as a surface) on which the brush 5 is implanted is defined as a flat surface.
As shown in FIGS. 1 (a), 1 (b), 2 (a), and 2 (b), the flocked portion 3 has a hole (gap 10a) penetrating from the surface of the flocked portion 3 to the opposite back surface. ) And a movable portion 11 disposed in the gap 10a.

The fixing part 10 is fixed to the tip of the neck part 4. The planar shape of the gap 10a of the fixed portion 10 is long in the direction of the major axis O of the toothbrush. Moreover, it is preferable that the plane area of the gap 10a (hereinafter referred to as a plane area) is in the range of 0.2 to 0.15 cm ² . On the other hand, the movable part 11 is arranged in an island shape in a state separated from the fixed part 10. The planar shape of the movable portion 11 is substantially the same as the planar shape of the gap 10a described above and has a slightly smaller plane area than the gap 10a. Note that the plane area of the movable portion 11 is preferably smaller than 95% of the plane area of the gap 10a. The movable portion 11 is connected and fixed to the tip of the drive shaft 25 in the neck portion 4 (the end portion on the side of the flocked portion 3), and the drive shaft 25 swings and moves by the drive mechanism 6 so that the long axis O of the toothbrush Oscillates around the center. The movable part 11 and the drive shaft 25 can be connected by a known technique such as screwing, welding, or undercutting. The frequency of the oscillating motion is preferably in the range of 20 to 50 kHz. Further, the swing angle of the swing motion by the drive mechanism 6 is preferably in the range of 1 to 20 degrees.

Here, the configuration of the drive mechanism 6 that swings the movable portion 11 will be described.
FIG. 3 is a cutaway view of the grip portion 2 representing the drive mechanism 6, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.
As shown in FIGS. 3, 4 (a) to 4 (d), the drive mechanism 6 includes a motor 20, a drive spur gear 21 supported on the rotation shaft 20 a of the motor 20, and the drive spur gear 21. A driven spur gear 22 meshed with the driven spur gear 22, an eccentric shaft 23 protruding from the driven spur gear 22, and a swing member 24 having a groove (long hole 24 a) penetrating in a direction parallel to the axis of the drive shaft 25 The drive shaft 25 is fixed to the swing member 24.

  The motor 20 is fixed to the outer shell portion 2 a of the grip portion 2, and the rotation shaft 20 a is disposed so as to extend in the same direction as the drive shaft 25. The driven spur gear 22 has a rotation shaft 22a parallel to the rotation shaft 20a of the motor 20, and is rotatably attached to the outer shell portion 2a of the grip portion 2 via the rotation shaft 22a. The eccentric shaft 23 extends in the same direction as the rotation shaft 22 a of the driven spur gear 22, and is disposed at a position eccentric from the rotation shaft 22 a of the driven spur gear 22. The elongated hole 24a of the swing member 24 extends in the radial direction of the drive shaft 25, and the eccentric shaft 23 is slidably inserted into the elongated hole 24a. The drive shaft 25 is a rod-shaped member made of metal, plastic, engineer plastic, or the like, and the swing member 24 is fixed to the base end (end portion on the grip portion 2 side) of the drive shaft 25.

  On the other hand, as shown in FIG. 1A, FIG. 1B, FIG. 2A, and FIG. 2B, the brush 5 is implanted in the fixed portion 10 and the movable portion 11, respectively. Specifically, a plurality of bundles of brushes 5 are implanted in the fixed portion 10 so that the implanted brushes 5 surround the plurality of bundles of brushes 5 implanted in the movable portion 11. Although it is necessary that at least one bundle of brushes 5 is implanted on the surface of the movable portion 11, the brushes 5 may not be implanted in the fixed portion 10. As shown in FIG. 2, the brush 5 is provided by bundling a plurality of bristles in a bundled hole 8 a formed in the base portion 8 of the flocked portion 3. The flocking hole 8a is a hole opened on the front surface side of the base portion 8 and formed to a depth that does not penetrate the back surface side.

  FIG. 5 is an enlarged view showing the brush 5. As shown in FIG. 5, the thickness D of one brush 5 is preferably in the range of 3 to 10 mil (0.076 to 0.254 mm), and more preferably 4 to 8 mil (0.101 to 0). .204 mm) is more preferable. Moreover, about the brush 5 planted in the movable part 11, it is preferable to use the thing made from 8 mil (0.204 mm) or less synthetic monofilament resin, or the thing made from the elastomer resin of arbitrary thickness.

  Further, the brush 5 preferably has a shape in which the end of the hair is tapered. In addition, all of the brushes 5 to be implanted in the flocked portion 3 may have a tapered tip, or a portion of the flocked portion 3 may have a brush 5 with a tapered tip. It may be flocked. For example, a configuration in which a normal brush 5 having a rounded bristles is planted in the fixed portion 10 and a brush 5 having a tapered bristles is implanted in the movable portion 11 may be employed.

  In addition, it is preferable that the electric toothbrush 1 which consists of an above-described structure has the full length in the range of 130-240 mm, the length of the holding part 2 is 90-140 mm, and the length of the neck part 4 is 30-70 mm. The length of the flocked part 3 is preferably 10 to 30 mm. Moreover, it is preferable that the sum total of the length of the flocked part 3 and the neck part 4 is 40-100 mm. In addition, the maximum thickness (maximum width of the grip portion 2) is preferably in the range of 10 to 30 mm, and the weight is preferably 130 g or less. Thereby, it can approximate the shape and weight of a manual toothbrush, and can improve usability (ease of use).

Next, the operation of the electric toothbrush 1 having the above configuration will be described.
As shown in FIGS. 1A and 1B, the drive mechanism 6 built in the grip portion 2 is operated to swing the movable portion 11 of the flocking portion 3. Specifically, as shown in FIGS. 3 and 4A to 4D, the motor 20 of the drive mechanism 6 is driven to rotate the rotary shaft 20a. When the rotating shaft 20a of the motor 20 rotates, the drive spur gear 21 rotates with the rotating shaft 20a. When the drive spur gear 21 rotates, the driven spur gear 22 meshed therewith rotates. When the driven spur gear 22 rotates, the eccentric shaft 23 that is eccentric from the rotation shaft 22a of the driven spur gear 22 rotates. When the eccentric shaft 23 pivots, the eccentric shaft 23 slides in the elongated hole 24 a of the swing member 24, and the swing member 24 swings in the radial direction of the drive shaft 25 around the drive shaft 25. When the swing member 24 swings, the drive shaft 25 whose base end is fixed to the swing member 24 swings in the radial direction. When the drive shaft 25 swings, the movable portion 11 in the inner peripheral portion of the flocked portion 3 is connected and fixed to the tip of the drive shaft 25, so that the toothbrush major axis O is centered as shown in FIG. Oscillate.
On the other hand, as shown in FIGS. 1 (a) and 1 (b), the fixing portion 10 in the outer peripheral portion of the flocked portion 3 is fixed to the tip of the neck portion 4 and thus does not move.

Next, the effect of the electric toothbrush 1 having the above-described configuration will be described.
According to the electric toothbrush 1 having the above-described configuration, the drive mechanism 6 is built in the grip portion 2, and the flocking portion 3 is disposed in the gap 10 a of the annular fixed portion 10. Since it becomes a structure, the thickness dimension of the flocked part 3 becomes small like a manual toothbrush, and the flocked part 3 becomes compact. For this reason, compared with a general electric toothbrush, the intraoral operability of the electric toothbrush 1 becomes better.

  Further, according to the electric toothbrush 1 having the above-described configuration, since the movable portion 11 is disposed in an island shape inside the annular fixed portion 10, vibration due to the movement of the movable portion 11 is transmitted to the gums, cheeks, and the like. It becomes difficult. Thereby, compared with a general electric toothbrush, discomfort due to vibration can be eliminated.

  Furthermore, according to the electric toothbrush 1 having the above-described configuration, since the movable portion 11 is arranged in the gap 10a of the annular fixed portion 10, the gap between the movable portion 11 and the fixed portion 10 penetrates. Wastes and the like clogged in the gap are easily washed away. Thereby, the flocked part 3 can be kept hygienic.

  Further, according to the electric toothbrush 1 having the above-described configuration, the movable portion 11 swings around the toothbrush long axis O, so that the plaque removal force is improved as compared with a general electric toothbrush or a manual toothbrush. , Cleaning effect is improved. Moreover, according to the electric toothbrush 1 which consists of an above-described structure, compared with a manual toothbrush, a favorable massage effect can be acquired. In addition, since it is possible to clean the entire space between the bristles of the brush 5, there is less residue left when the scrub method or the bath method is used for cleaning, and the tooth gap is smaller than that of a general electric toothbrush or manual toothbrush. The cleaning feeling can be improved. Further, since the operation amount is small and the structure is simple, the power of the motor 20 can be efficiently transmitted to the brush 5 and the driving loss is low and efficient. Thereby, the motor 20 can be reduced in size and the holding part 2 can be made compact.

  Further, according to the electric toothbrush 1 having the above-described configuration, the brush 5 is implanted not only in the movable part 11 but also in the fixed part 10 around it, so that the brushing pressure applied to the movable part 11 is reduced. Further, it is possible to suppress an excessive load on the drive shaft 25 that supports the movable portion 11.

Moreover, when the plane area of the space | gap 10a is made into the range of 0.2-0.15 cm < ² >, sufficient cleaning effect and favorable oral operability can each be implement | achieved. If the plane area of the gap 10a is smaller than 0.2 cm ² , the movable part 11 that fits in the gap 10a becomes too small, so that the plaque removing power is remarkably reduced and a sufficient cleaning effect cannot be exhibited. Moreover, when the plane area of the space | gap 10a is larger than 0.15 cm < ² >, oral operability will deteriorate remarkably.

  Moreover, if the plane area of the movable part 11 is made smaller than 95% of the plane area of the space | gap 10a, the movable part 11 can move favorably and the cleaning effect and massage effect of the electric toothbrush 1 mentioned above can be acquired. . If the plane area of the movable part 11 is 95% or more of the plane area of the gap 10a, sufficient space for the island-like movable part 11 to move cannot be secured, and the movement of the movable part 11 is restricted. The effect as the electric toothbrush 1 cannot be obtained.

In addition, when the brush 5 having a tapered tip is implanted in at least a part of the flocked portion 3, it is easy to hit the gums and a better massage feeling can be obtained.
Further, when the thickness D of one brush 5 is set in the range of 3 to 10 mil, a high brushing feeling can be obtained.
Moreover, when the thickness D of one brush 5 is set in the range of 4 to 8 mil, a high brushing feeling can be obtained, a feeling of massage is improved, and a feeling of hitting the gums is improved.
Furthermore, if the brush 5 to be planted on the movable part 11 is made of synthetic monofilament resin having a thickness of 8 mil or less, or made of elastomer resin having an arbitrary thickness, it has a high massage effect with less harmfulness to the gums. Obtainable.

[Second Embodiment]
Next, a second embodiment will be described. In addition, about the structure similar to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

FIG. 6 is a partially enlarged view showing the flocked portion 103.
As shown in FIG. 6, the movable portion 111 of the flocked portion 103 in the present embodiment is disposed in the gap 10 a that penetrates the fixed portion 10, and is a toothbrush long axis relatively to the fixed portion 10. Reciprocal movement in the O direction is possible. That is, the movable portion 111 is provided so as to be slidable along the gap 10a that is long in the direction of the major axis O of the toothbrush. The dimension of the movable portion 111 in the toothbrush major axis O direction is smaller than the dimension of the gap 10a in the toothbrush major axis O direction by the stroke.

  The movable portion 11 is connected and fixed to the tip of the drive shaft 25 in the neck portion 4, and the drive shaft 25 reciprocates in the axial direction by a drive mechanism 106 shown in FIG. Reciprocate. The frequency of the reciprocating motion by the drive mechanism 106 is preferably in the range of 20 to 50 kHz. The vibration width of the reciprocating motion by the driving mechanism 6 is preferably a stroke of 4 mm or less. Thereby, a high cleaning effect can be obtained.

Next, the configuration of the drive mechanism 106 that reciprocates the movable portion 111 will be described.
FIG. 7 is a cutaway view showing the drive mechanism 106, and FIG. 8 is a view showing the operation of the drive mechanism 106.
As shown in FIGS. 7 and 8 (a) to 8 (d), the drive mechanism 106 includes a motor 20, a drive bevel gear 121 pivotally supported on the rotation shaft 20a of the motor 20, and the drive bevel teeth. A driven bevel gear 122 meshed with the gear 121, an eccentric shaft 123 projecting from the driven bevel gear 122, and a reciprocating member 124 having a groove (long hole 124a) penetrating in the radial direction of the drive shaft 25; The drive shaft 25 is fixed to the swing member 124.

  The driven bevel gear 122 has a rotation shaft 122a orthogonal to the rotation shaft 20a of the motor 20 (the axis of the drive bevel gear 121), and is connected to the outer shell portion 2a of the grip portion 2 via the rotation shaft 122a. It is attached so that it can rotate freely. The eccentric shaft 123 extends in the same direction as the rotation shaft 122 a of the driven bevel gear 122 and is disposed at a position eccentric from the rotation shaft 122 a of the driven bevel gear 122. The elongated hole 124a of the reciprocating member 124 extends in the radial direction of the drive shaft 25, and the eccentric shaft 123 is slidably inserted into the elongated hole 124a. The reciprocating member 124 is fixed to the base end of the drive shaft 25.

Next, operation | movement of the electric toothbrush 101 provided with the above-mentioned drive mechanism 106 is demonstrated.
The drive mechanism 106 shown in FIG. 7 is operated to reciprocate the movable part 111 of the flocked part 103 shown in FIG. Specifically, as shown in FIGS. 7 and 8A to 8D, the motor 20 of the drive mechanism 6 is driven to rotate the rotary shaft 20a. When the rotating shaft 20a of the motor 20 rotates, the drive bevel gear 121 rotates with the rotating shaft 20a. When the drive bevel gear 121 rotates, the driven bevel gear 122 meshed therewith rotates. When the driven bevel gear 122 rotates, the eccentric shaft 123 eccentric from the rotation shaft 122a of the driven bevel gear 122 rotates. When the eccentric shaft 123 rotates, the eccentric shaft 123 slides in the elongated hole 124 a of the reciprocating member 124 and the reciprocating member 124 reciprocates in the axial direction of the drive shaft 25. When the reciprocating member 124 reciprocates, the drive shaft 25 whose base end is fixed to the reciprocating member 124 reciprocates in the axial direction. When the drive shaft 25 reciprocates, the movable portion 111 in the inner peripheral portion of the flocked portion 103 is connected and fixed to the tip of the drive shaft 25 as shown in FIG. To do.

Next, the effect of the electric toothbrush 101 having the above-described configuration will be described.
According to the electric toothbrush 101 having the above-described configuration, since the movable portion 111 is arranged in an island shape in the gap 10a through which the annular fixed portion 10 passes, the electric toothbrush 101 is electrically driven in the same manner as in the first embodiment described above. The operability of the toothbrush 101 in the oral cavity can be improved, and discomfort can be eliminated, and the flocked portion 103 can be kept hygienic.

  Further, according to the electric toothbrush 101 having the above-described configuration, the movable portion 111 reciprocates in the direction of the long axis O of the toothbrush, so that the plaque removal force is improved and cleaning is performed as compared with a general electric toothbrush or manual toothbrush. The effect is improved.

[Third Embodiment]
Next, a third embodiment will be described. In addition, about the structure similar to 1st, 2nd embodiment mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The flocked portion of the electric toothbrush in the present embodiment has a configuration in which the movable portion is arranged in an island shape in the gap that penetrates the annular fixed portion. This movable part swings around the toothbrush long axis O like the movable part 11 shown in FIG. 3, and reciprocates in the direction of the toothbrush long axis O like the movable part 111 shown in FIG.

Here, a configuration of the drive mechanism 206 that reciprocates while swinging the movable portion will be described.
FIG. 9 is a cutaway view showing the drive mechanism 206, and FIG. 10 is a view showing the operation of the drive mechanism 206.
As shown in FIGS. 9 and 10 (a) to 10 (d), the driving mechanism 206 includes a motor 20, a driving two-stage gear 221 supported on the rotating shaft 20a of the motor 20, and the driving mechanism 206. The driven spur gear 22 and the driven bevel gear 122 respectively meshed with the two-stage gear 221, the eccentric shaft (first eccentric shaft) 23 protruding from the driven spur gear 22, and the driven bevel gear 122 are protruded. Eccentric shaft (second eccentric shaft) 123, a groove penetrating in the direction parallel to the axis of the drive shaft 25 (first elongated hole 224a) and a groove penetrating in the radial direction of the drive shaft 25 (second elongated hole 224b) And a drive shaft 25 fixed to the rocking reciprocating member 224.

  The driving two-stage gear 221 is a gear having a configuration in which a bevel gear portion 221b is superimposed on a spur gear portion 221a. The spur gear portion 221a is engaged with the driven spur gear 22, and the bevel gear portion 221bB is driven. It is meshed with the bevel gear 122. The rocking reciprocating member 224 is a member having a combination of a square and a circle, and a first elongated hole 224a is formed in the rectangular portion, and a second elongated hole 224b is formed in the circular portion. The first elongated hole 224a of the swinging reciprocating member 224 extends in the radial direction of the drive shaft 25, and the first eccentric shaft 23 is slidably inserted into the first elongated hole 224a. The second long hole 224b of the rocking reciprocating member 224 extends in the radial direction of the drive shaft 25, and the second eccentric shaft 123 is slidably inserted into the second long hole 224b. The rocking reciprocating member 224 has a circular portion fixed to the base end of the drive shaft 25.

Next, operation | movement of an electric toothbrush provided with the above-mentioned drive mechanism 206 is demonstrated.
The drive mechanism 206 shown in FIG. 9 is operated to reciprocate the movable part of the flocked part (not shown) while swinging. More specifically, as shown in FIGS. 9 and 10A to 10D, the motor 20 of the drive mechanism 206 is driven to rotate the rotating shaft 20a. When the rotating shaft 20a of the motor 20 rotates, the driving two-stage gear 221 rotates with the rotating shaft 20a. When the driving second gear 221 rotates, the driven spur gear 22 meshed with the spur gear portion 221a of the driving second gear 221 rotates and the driven meshed with the bevel gear portion 221b of the driving second gear 221. The bevel gear 122 rotates. When the driven spur gear 22 rotates, the eccentric shaft 23 eccentric from the rotation shaft 22a of the driven spur gear 22 rotates, and the first eccentric shaft 23 slides in the first elongated hole 224a of the rocking reciprocating member 224. The swing reciprocating member 224 swings in the radial direction of the drive shaft 25 around the drive shaft 25. Further, when the driven bevel gear 122 rotates, the eccentric shaft 123 eccentric from the rotation shaft 122 a of the driven bevel gear 122 rotates, and the eccentric shaft 123 slides in the second elongated hole 224 b of the rocking reciprocating member 224. At the same time, the rocking reciprocating member 224 reciprocates in the axial direction of the drive shaft 25. When the drive shaft 25 reciprocates while swinging in this manner, the movable portion (not shown) connected and fixed to the tip of the drive shaft 25 becomes the toothbrush major axis O like the movable portion 11 shown in FIG. 6 reciprocatingly moves in the direction of the major axis O of the toothbrush like the movable portion 111 shown in FIG.

Next, the effect of the electric toothbrush having the above-described configuration will be described.
According to the electric toothbrush provided with the drive mechanism 206 described above, since the movable part is arranged in an island shape in the gap through the annular fixed part, as in the first and second embodiments described above, The oral operability of the electric toothbrush can be improved, discomfort can be eliminated, and the flocked portion can be kept hygienic.

  Moreover, according to the electric toothbrush 101 having the above-described configuration, the movable part swings around the long axis of the toothbrush and reciprocates in the direction of the long axis of the toothbrush. Further improve.

  As mentioned above, although embodiment of the electric toothbrush which concerns on this invention was described, this invention is not limited to the above-mentioned 1st-3rd embodiment, In the range which does not deviate from the meaning, it can change suitably. is there. For example, in the first to third embodiments described above, the movable parts 11 and 111 swing and / or reciprocate, or both move simultaneously. The part may move other than a swinging motion or a reciprocating motion. For example, the movable part may be configured to rotate, or the movable part may be moved in the direction of the hair bundle (the extending direction of the brush 5). Furthermore, these movements and other movements may be used. May be performed simultaneously. In addition, by making the movable part move in the hair bundle direction, an appropriate stimulus can be given to the gingiva, and a high massage effect can be obtained.

In addition, the constituent elements in the first to third embodiments described above can be appropriately replaced with known constituent elements without departing from the gist of the present invention. For example, the drive mechanisms 6, 106, and 206 that cause the movable parts 11 and 111 to swing and reciprocate are not limited to the above-described mechanisms, and can be replaced with other drive mechanisms.
In addition, the constituent elements described in the first embodiment can be applied as appropriate in the second and third embodiments without departing from the gist of the present invention. For example, the optimum range of the flat area of the gap 10a and the optimum range of the flat area of the movable portion 11 shown in the first embodiment can be similarly applied to the second and third embodiments. Further, the shape (material tip taper shape), material, thickness D, etc. of the brush 5 shown in the first embodiment can be similarly applied to the second and third embodiments.
Furthermore, in addition to the above-described modification examples, it is possible to appropriately combine known techniques, and the above-described modification examples may be appropriately combined.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the electric toothbrush for demonstrating 1st Embodiment of the electric toothbrush which concerns on this invention. It is sectional drawing of the flocked part for demonstrating 1st Embodiment of the electric toothbrush which concerns on this invention. It is a fracture view of a grasping part showing a drive mechanism for explaining a 1st embodiment of an electric toothbrush concerning the present invention. It is a figure showing operation | movement of the drive mechanism for demonstrating 1st Embodiment of the electric toothbrush which concerns on this invention. It is a figure showing the bristles of the brush for demonstrating 1st Embodiment of the electric toothbrush which concerns on this invention. It is an external view of the hair transplant part for demonstrating 2nd Embodiment of the electric toothbrush which concerns on this invention. It is a fracture | rupture figure of the holding part showing the drive mechanism for describing 2nd Embodiment of the electric toothbrush which concerns on this invention. It is a figure showing operation | movement of the drive mechanism for demonstrating 2nd Embodiment of the electric toothbrush which concerns on this invention. It is a fracture | rupture figure of the holding part showing the drive mechanism for demonstrating 3rd Embodiment of the electric toothbrush which concerns on this invention. It is a figure showing operation | movement of the drive mechanism for demonstrating 3rd Embodiment of the electric toothbrush which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Electric toothbrush 2 Holding part 3,103 Flocking part 4 Neck part 5 Brush 6,106,206 Drive mechanism 10 Fixed part 10a Space | gap 11,111 Movable part 25 Drive axis O Toothbrush long axis

Claims (5)

A gripping portion having a built-in drive mechanism, a hair transplanting portion in which a brush is implanted, and a neck portion that is installed between the gripping portion and the hair transplanting portion and into which the drive shaft of the drive mechanism is inserted. An electric toothbrush comprising:
The flocked portion is fixed to the neck portion and has an annular fixed portion having a penetrating gap, and is disposed in the gap and movable by being transmitted with power from the drive mechanism via the drive shaft. An electric toothbrush characterized by comprising a movable part. The electric toothbrush according to claim 1,
The electric toothbrush characterized in that the movable part reciprocates in the toothbrush long axis direction and swings around the toothbrush long axis. The electric toothbrush according to claim 1 or 2,
The electric toothbrush characterized in that the plane area of the gap is in the range of 0.20 to 1.50 cm ² . The electric toothbrush according to any one of claims 1 to 3,
The electric toothbrush characterized in that a plane area of the movable part is smaller than 95% of a plane area of the gap. The electric toothbrush according to any one of claims 1 to 4,
An electric toothbrush characterized in that a brush having a tapered tip is implanted in at least a part of the flocked portion.

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