JP2011136148A - Electric toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric toothbrush excellent in tooth brushing performance and brushing handleability. <P>SOLUTION: The electric toothbrush 1 includes: a body case 2 housing a motor M as a vibration source; a toothbrush 5 attached to the body case 2; and a holding part case 4 attached to the proximal end part of the body case 2. On the distal end part of the body case 2, a brush attaching shaft 11 for attaching the toothbrush 5 is provided. The brush attaching shaft 11 is provided with a top wall for closing the opening of the distal end part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric toothbrush.

  Conventionally, various toothbrushes have been proposed in which the motor is vibrated by rotating an eccentric weight with a motor and the vibration is transmitted to the toothbrush bristles of the toothbrush to improve plaque removal performance against hand brushing. (For example, Patent Document 1).

  In recent years, awareness of oral hygiene has increased, and toothbrushing at workplaces, such as lunch, and toothbrushing at travel destinations, have been carried out. As a result, electric toothbrushes with excellent plaque removal performance have been increasingly used not only at home but also when brushing teeth at work or travel destinations.

Japanese Patent Laid-Open No. 9-168554

  By the way, an electric toothbrush must be equipped with a vibration generator consisting of a motor with an eccentric weight, a battery for driving the vibration generator, etc. It was bulky and inconvenient to put in and carry.

Therefore, there is a demand for an electric toothbrush that is small and excellent in portability without reducing the tooth scrubbing performance.
However, when pursuing portability and reducing the size of the electric toothbrush, the vibration of the motor was transmitted more strongly to the smaller gripping part, and the strong vibration was felt in the hand it held, and it was poor. Therefore, it is conceivable to reduce the vibration of the motor, but it is not desirable to reduce the vibration of the motor because the tooth scraping performance is lowered.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric toothbrush that is excellent in tooth scrubbing performance and easy to brush.

Hereinafter, means for achieving the above object will be described.
The electric toothbrush of the present invention is an electric toothbrush including a main body case that houses a motor as a vibration source, a toothbrush that is attached to the main body case, and a gripping case that is attached to a base end portion of the main body case. A brush attachment shaft cylinder for attaching the toothbrush is provided at the distal end portion of the main body case, and the brush attachment shaft tube is provided with a top wall for closing the opening portion of the distal end portion.

In this electric toothbrush, it is preferable that a cap that can be attached to and detached from the main body case and covers the toothbrush is provided.
In this electric toothbrush, the outer periphery of the base end portion of the toothbrush is a brush bristle side of the end portion of the toothbrush as a tip portion, and the main body case side of the end portion of the toothbrush is a base end portion. It is preferable that the cap is covered.

  In the electric toothbrush, the brush bristle side of the end portion of the toothbrush is a distal end portion, and the main body case side of the end portion of the toothbrush is a base end portion, and the brush mounting shaft cylinder is connected to the toothbrush. It is preferable that it is inserted into the toothbrush from the opening on the proximal end side.

  In this electric toothbrush, the main body case is constituted by a combination of an outer case having the brush mounting shaft cylinder and an inner case having a motor housing portion for housing the motor, and the brush mounting shaft. It is preferable that the motor accommodating portion is provided in a cylinder.

-In this electric toothbrush, it is preferable that the main body side sealing member which seals between the said outer case and the said inner case is provided.
In this electric toothbrush, the gripper case is attached to the main body case so that the end surface of the base end of the outer case and the end surface of the tip of the gripper case face each other, and the base of the outer case It is preferable that the main body side sealing member is provided between the inner peripheral surface of the end portion and the outer surface of the inner case.

  In this electric toothbrush, a cross-section including the rotation shaft of the motor and the bristles of the toothbrush and parallel to the rotation shaft of the motor is a side cross-section, and the side cross-section is the center axis of the gripping part case The side of the toothbrush that includes the tip of the bristle is the front side, and the side section has the rear side opposite to the front side with respect to the central axis of the gripping part case, and the direction along the central axis of the gripping part case In the outer case, a portion located between the toothbrush and the gripping case is a case intermediate portion, and the front wall portion of each of the case intermediate portion and the brush mounting shaft cylinder is defined as a front portion in the side cross section. As the wall portion, the brush mounting shaft cylinder is continuously provided at the end portion on the toothbrush side in the case intermediate portion, and the front wall portion of the case intermediate portion is provided. A stepped portion is formed at a boundary portion between the case intermediate portion and the brush mounting shaft tube by being provided on the front side with respect to the front wall portion of the brush mounting shaft tube, an end surface of the base end portion of the toothbrush It is preferable that the toothbrush is attached to the main body case such that the toothbrush faces the end surface of the stepped portion.

  In this electric toothbrush, a battery housing part for mounting a battery is provided in the inner case, the battery housing part is provided in the gripping part case, and a tip of the gripping part case It is preferable that a grip-side seal member is provided between the inner peripheral surface of the portion and the outer surface of the inner case.

  In this electric toothbrush, a cross-section including the rotation shaft of the motor and the bristles of the toothbrush and parallel to the rotation shaft of the motor is a side cross-section, and the side cross-section is the center axis of the gripping part case The side of the toothbrush that includes the tip of the bristle is the front side, the side cross section is the rear side opposite to the front side with respect to the central axis of the gripping part case, and the outer case and the inner side are the side cross sections. The front wall portion of each of the case and the toothbrush is a front wall portion, and the rear wall portion of each of the outer case, the inner case, and the toothbrush is a rear wall portion in the side cross section, and An outer surface of a front wall portion of the toothbrush is a front surface, and an outer surface of a rear wall portion of the toothbrush is a rear surface in the side section, and the toothbrush The end portion of the toothbrush on the brush bristle side of the end portion is a tip portion, and the end portion of the toothbrush on the main body case side is a base end portion, and the front side of the motor in the side section. Is provided with a front wall portion of the inner case, a front wall portion of the outer case is provided on a front side of the front wall portion of the inner case, and a front wall of the toothbrush is provided on a front side of the front wall portion of the outer case. It is preferable that a part is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the electric toothbrush which is excellent in the tooth scavenging performance and is easy to brush.

The side view of the electric toothbrush for demonstrating the electric toothbrush of 1st Embodiment. The side view of the electric toothbrush which shows the state which similarly attached and detached the toothbrush. The side view of the electric toothbrush which similarly shows the state with which the cap was mounted | worn. The front view of the electric toothbrush which similarly shows the state with which the cap was mounted | worn. The side sectional view of an electric toothbrush similarly. The partially expanded side sectional view of an electric toothbrush similarly. The sectional side view of the electric toothbrush for demonstrating another example of an electric toothbrush.

A first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the electric toothbrush 1 includes a main body case 2, a gripping case 4 that is externally fitted to the base end side of the main body case 2, a toothbrush 5 that is externally fitted to the distal end side of the main body case 2, As shown in FIG. 3, it has the cap 6 externally fitted by the main body case 2 to which the toothbrush 5 was mounted | worn.

  As shown in FIGS. 5 and 6, the main body case 2 has an outer case 10 and an inner case 20. The outer case 10 accommodates the inner case 20, and the inner case 20 is configured to accommodate electrical components for applying vibration to the toothbrush 5.

Based on FIG. 5 and FIG. 6, the term regarding the electric toothbrush 1 is defined as follows.
(A) A cross section including the rotation shaft of the motor M and the bristles 52 of the toothbrush 5 and parallel to the rotation shaft of the motor M is defined as a side cross section.
(B) In the side cross section, the side including the tip of the bristles 52 of the toothbrush 5 with respect to the central axis of the gripping part case 4 is defined as the front side. Further, the side opposite to the front side with respect to the central axis of the gripping part case 4 in the side cross section is defined as the rear side.
(C) A portion located between the toothbrush 5 and the grip portion case 4 in the outer case 10 in the direction along the central axis of the grip portion case 4 is defined as a case intermediate portion. Moreover, let the wall part of each front side of a case intermediate part and the brush attachment axial cylinder 11 be a front wall part in a side cross section. In addition, the rear wall portion of each of the outer case 10, the inner case 20, and the toothbrush 5 in the side cross section is defined as a rear wall portion.
(D) Let the outer surface of the front wall part of the toothbrush 5 be a front surface in a side cross section. Moreover, let the outer surface of the rear wall part of the toothbrush 5 be the rear surface 51a in the side cross section.
(E) Let the bristle 52 side of the edge parts of the toothbrush 5 be a front-end | tip part. Moreover, let the edge part on the opposite side to the front-end | tip part of the edge parts of the toothbrush 5 be a base end part.

  As shown in FIG. 5 and FIG. 6, the outer case 10 is a chamfered, covered rectangular cylindrical case made of ABS resin, and the brush mounting shaft cylinder 11 is formed by reducing the diameter of the upper portion thereof. The covered square cylindrical brush mounting shaft cylinder 11 is provided with a top wall that closes the opening at the tip. The cylindrical space S1 (see FIG. 6) of the brush mounting shaft cylinder 11 communicates with the square cylindrical space S2 (see FIG. 6) of the outer case 10. As shown in FIG. 2, the brush mounting shaft cylinder 11 is formed on the upper surface of the outer case 10 so that the central axis C <b> 1 is biased toward the rear surface 10 a side of the outer case 10 with respect to the central axis of the outer case 10. ing.

  The brush mounting shaft cylinder 11 is inserted into the toothbrush 5 from the opening on the proximal end side of the toothbrush 5. In the case middle portion, a brush mounting shaft cylinder 11 is continuously provided at an end portion on the toothbrush 5 side. By providing the front wall portion of the case intermediate portion on the front side with respect to the front wall portion of the brush attachment shaft cylinder 11, a step portion is formed at the boundary portion between the case intermediate portion and the brush attachment shaft cylinder 11. The toothbrush 5 is attached to the main body case 2 so that the lower end surface 53 of the base end portion of the toothbrush 5 faces the end surface of the stepped portion.

  In the side cross section, the front wall of the inner case 20 is provided on the front side of the motor M. A front wall portion of the outer case 10 is provided on the front side of the front wall portion of the inner case 20. A front wall portion of the toothbrush 5 is provided on the front side of the front wall portion of the outer case 10.

  A through hole 12 is formed through the front surface 10 b of the outer case 10, and the through hole 12 is closed by a flexible switch member 13. The switch member 13 is made of an elastomer resin and is fused to the opening edge of the through-hole 12. Accordingly, the switch member 13 that closes the through-hole 12 with the finger can be pushed into the space S2.

  An inner case 20 is accommodated in the spaces S <b> 1 and S <b> 2 of the outer case 10. The inner case 20 is made of ABS resin, and is formed with a square cylindrical body 21 chamfered at a substantially central position. The outer shape of the trunk portion 21 is the same shape as the inner peripheral surface of the outer case 10, and the upper half of the trunk portion 21 is housed in the space S <b> 2 of the outer case 10.

  A battery housing portion 22 is formed at the lower portion of the body portion 21 so as to extend in half by dividing the bottomed cylindrical body and opening the rear side. The battery housing part 22 is exposed downward from the lower side of the outer case 10 when a substantially upper half of the body part 21 is housed in the space S <b> 2 of the outer case 10. The battery housing part 22 is provided with an anode terminal fitting 23 at the bottom and a cathode terminal spring 24 extending from the body part 21 at the top. When the AAA battery B is accommodated in the battery accommodating portion 22, the battery B is accommodated and held in the battery accommodating portion 22 while being electrically connected to the anode terminal fitting 23 and the cathode terminal spring 24. The

  On the upper side of the body portion 21, a substrate fixing portion 25 is formed to extend. The board fixing part 25 is arranged at a position opposite to the switch member 13 provided in the outer case 10 when a substantially upper half of the body part 21 is housed in the space S2 of the outer case 10. A printed wiring board 26 is fixed to the board fixing unit 25. A switch SW that is electrically connected to the anode terminal fitting 23 and the cathode terminal spring 24 is mounted on the printed wiring board 26. The switch SW mounted on the printed wiring board 26 is mounted at a position facing the switch member 13 provided on the outer case 10. Therefore, when the switch member 13 is pushed with a finger, the switch SW is turned on / off by the pushed switch member 13.

  On the upper side of the substrate fixing portion 25, a motor housing portion 27 is formed to extend so as to halve the covered cylinder and open the rear side. The motor housing portion 27 is arranged in the space S1 of the brush mounting shaft cylinder 11 when the body portion 21 is installed in the space S2 of the outer case 10. When the motor housing portion 27 is housed in the space S <b> 1 of the brush mounting shaft cylinder 11, the outer peripheral surface of the motor housing portion 27 comes into close contact with the inner peripheral surface of the brush mounting shaft tube 11.

  As shown in FIGS. 5 and 6, the motor M is accommodated in the motor accommodating portion 27. The motor M accommodated in the motor accommodating portion 27 is configured such that when the motor accommodating portion 27 is housed in the space S1 of the brush mounting shaft cylinder 11, the outer peripheral surface of the portion opened from the motor accommodating portion 27 is brushed via the spacer 28. The inner cylinder 11 comes into contact with the inner peripheral surface of the mounting shaft cylinder 11. The rotation axis of the motor M is provided on the rear side of the central axis of the gripping part case 4. Further, it protrudes from the upper surface of the motor housing portion 27 into the space S1. An eccentric weight 29 is fixed to the protruding portion of the rotating shaft.

The outer surface on the front side of the motor M is in direct contact with the front wall portion of the inner case 20.
As shown in FIGS. 5 and 6, a spacer 28 is provided between the outer surface of the rear side of the motor M and the rear wall portion of the inner case 20. The spacer 28 is in direct contact with each of the rear wall portion of the outer case 10 and the motor M.

  In the side cross section, the front wall of the inner case 20 is provided on the front side of the motor M. Further, the front wall portion of the outer case 10 is provided on the front side of the front wall portion of the inner case 20. A front wall portion of the toothbrush 5 is provided on the front side of the front wall portion of the outer case 10. A spacer 28 is provided on the rear side of the motor M. A rear wall portion of the outer case 10 is provided on the rear side of the spacer 28. A rear wall portion of the toothbrush 5 is attached to the rear side of the outer case 10.

  A switch SW is provided on the front wall portion of the inner case 20. The switch SW is provided in a portion of the inner case 20 opposite to the portion where the spacer 28 is provided with respect to the central axis of the grip portion case 4.

  When the switch M mounted on the printed wiring board 26 is turned on, the motor M rotates by being applied with the voltage of the battery B. When the motor M rotates, the eccentric weight 29 fixed to the rotating shaft rotates eccentrically around the rotating shaft, and the rotating shaft is shaken by the eccentric rotation, and the motor M itself housed and held in the motor housing portion 27 vibrates. . The vibration of the motor M is propagated through the motor housing portion 27 to the brush mounting shaft cylinder 11 that is in close contact with the motor housing portion 27.

  As for the outer peripheral surface of the trunk | drum 21 of the inner case 20, the upper half inside the outer case 10 is diameter-reduced from the lower half which is not built in the outer case 10. FIG. Thus, when the motor housing portion 27 of the inner case 20 is installed in the upper half space S1 of the outer case 10 and the board fixing portion 25 of the inner case 20 is installed in the space S2, the outer peripheral surface of the lower half of the body portion 21 is the outer case. 10 is engaged with the inner peripheral surface of the inner case 20 to restrict further entry of the inner case 20. That is, in the inner case 20, the upper half of the body portion 21 is housed in the outer case 10, and the lower half of the body portion 21 and the battery housing portion 22 are exposed from the outer case 10.

  An upper annular groove 30 is formed on the outer peripheral surface of the upper half of the body portion 21, and a seal ring R <b> 1 as a second elastic member is fitted into the upper annular groove 30. The seal ring R <b> 1 is made of a rubber O-ring, and the outer portion of the seal ring R <b> 1 protrudes from the outer peripheral surface of the trunk portion 21 in a state of being fitted in the upper annular groove 30. Therefore, when the inner case 20 (body portion 21) is housed in the outer case 10, the seal ring R1 of the upper annular groove 30 is elastically deformed on the inner peripheral surface of the outer case 10, and the inner case 20 (body portion 21). ) And the outer case 10 are watertight and elastically supported.

  As shown in FIGS. 5 and 6, the end surface of the proximal end portion of the outer case 10 and the end surface of the distal end portion of the grip portion case 4 are opposed to each other. A lower annular groove 31 is formed on the outer peripheral surface of the lower half of the body portion 21, and an elastic ring R <b> 2 as an elastic member is fitted into the lower annular groove 31. The elastic ring R2 is a ring made of synthetic resin having elasticity, and in this embodiment, a rubber O-ring used as a sealing material is used. The elastic ring R <b> 2 is configured such that an outer portion of the elastic ring R <b> 2 protrudes from the outer peripheral surface of the trunk portion 21 in a state where the elastic ring R <b> 2 is fitted in the lower annular groove 31.

The main body case 2 formed in this way has a gripping part case 4 attached to the lower side and a toothbrush 5 attached to the upper side.
The gripping part case 4 is a case with a chamfered bottomed rectangular tube made of ABS resin, and the battery housing part 22 of the inner case 20 constituting the main body case 2 is mounted in the internal space from the upper opening. The inner peripheral surface shape of the upper opening of the gripping part case 4 is the same shape as the outer peripheral surface shape of the lower half of the body part 21, and the lower half of the body part 21 is housed in the gripping part case 4. ing.

  At this time, the outer case 10 is not housed in the gripping part case 4, and the opening end face 15 of the outer case 10 comes into contact with the opening end face 41 of the gripping part case 4. The outer diameter of the grip part case 4 is formed larger than the outer diameter of the outer case 10. Therefore, when the opening end surface 15 of the outer case 10 and the opening end surface 41 of the gripping case 4 are combined, the outer peripheral surface of the gripping case 4 protrudes outward from the outer peripheral surface of the outer case 10. And the opening part end surface 41 of the holding | grip part case 4 exposed outside becomes the level | step difference surface 41a.

  As shown in FIGS. 5 and 6, an elastic ring R <b> 2 is provided between the inner peripheral surface of the distal end portion of the grip portion case 4 and the outer surface of the inner case 20. When the inner case 20 (body portion 21) is housed in the grip portion case 4, the elastic ring R2 of the lower annular groove 31 is elastically deformed on the inner surface of the upper opening portion of the grip portion case 4, and the inner case 20 (body portion) Part 21) and the gripping part case 4 are watertight and elastically supported. Then, by attaching the main body case 2 to the grip portion case 4, the grip portion of the electric toothbrush 1 is formed by the grip portion case 4, and the battery B accommodated and held in the battery housing portion 22 is held by the grip portion case 4. It is sealed and stored.

  The length of the portion directly facing the grip portion case 4 in the front wall portion of the inner case 20 is defined as length P, and the length of the portion directly facing the grip portion case 4 in the rear wall portion of the inner case 20 Is a length Q, the length Q is smaller than the length P.

  The toothbrush 5 mounted on the upper side of the main body case 2 has a holding portion 51, and brush bristles 52 are implanted at the tip of the holding portion 51. The holding portion 51 has an outer shape at the base end that is the same as the outer shape of the outer case 10, and a fitting hole 54 is formed in the lower end surface 53 of the base end. In the fitting hole 54, the brush mounting shaft cylinder 11 formed in the outer case 10 is press-fitted and detachably fitted. The inner peripheral surface of the fitting hole 54 is in close contact with the outer peripheral surface of the brush mounting shaft tube 11 when the brush mounting shaft tube 11 is fitted. Therefore, the vibration of the motor M propagated to the brush mounting shaft cylinder 11 via the motor housing portion 27 is propagated to the brush bristles 52 at the tip portion via the holding portion 51 of the toothbrush 5.

  The holding | maintenance part 51 is formed so that it may become thin toward the front-end | tip part from the base end. More specifically, the holding portion 51 is formed so that the front surface is on the rear surface 51a side and the left and right side surfaces are close to each other. That is, the front end portion of the holding portion 51 is disposed and planted so that the rear surface 51a of the front end portion is located behind the center axis C1 of the brush mounting shaft cylinder 11 and ahead of the rear surface 10a of the outer case 10. The bristles of the brush hairs 52 are prevented from protruding from the front surface 10 b of the outer case 10. In addition, since the front surface of the holding unit 51 is moved backward to the rear surface 51a side so that the front end portion of the holding unit 51 is arranged at the rear position, when brushing teeth, the front surface of the holding unit 51 protrudes, It prevents the teeth from hitting the overhanging part and becoming difficult to polish.

  In the side cross section, the thickness of the front wall portion of the main body case 2 is defined as a thickness X1, and the thickness of the front wall portion of the toothbrush 5 is defined as a thickness Y1. In the side cross section, the thickness of the rear wall portion of the main body case 2 is defined as a thickness X2, and the thickness of the rear wall portion of the toothbrush 5 is defined as a thickness Y2.

  As shown in FIGS. 5 and 6, the thickness of the end face of the base end portion of the toothbrush 5 and the portion of the main body case 2 corresponding to the end face is the thickness X2 and the thickness Y1 combined. It is larger than the combined thickness of Y2.

  In the toothbrush 5, when the length of the front surface extending from the base end portion to the tip end portion is a length V and the length of the rear surface 51a from the base end portion to the tip end portion is a length W, the length W is long. Less than V. Further, a portion of the front wall portion of the toothbrush 5 corresponding to the motor M is provided with a lightening portion.

  Further, the vibration source motor M is housed in the brush mounting shaft cylinder 11, and the holding portion 51 of the toothbrush 5 is press-fitted into the brush mounting shaft cylinder 11, so that the length of the brush mounting shaft cylinder 11 (the brush It is possible to make the front end of the holder 51 close to (shrink) the main body case 2 side. As a result, the entire length of the electric toothbrush 1 can be shortened, and the electric toothbrush 1 can easily enter a pouch or a pocket and has excellent portability.

  As shown in FIGS. 5 and 6, the toothbrush 5 attached to the main body case 2 is accommodated in a cap 6. The cap 6 is a case with a chamfered covered rectangular cylinder made of ABS resin, and can be attached to and removed from the main body case 2. When the cap 6 is attached to the main body case 2, the outer periphery of the base end portion of the toothbrush 5 is covered with the cap 6.

  The toothbrush 5 and the main body case 2 are inserted into the inner space of the cap 6 from the lower opening. The inner peripheral surface shape of the lower opening of the cap 6 is the same shape as the outer peripheral surface shape of the main body case 2, and the lower end surface 61 of the cap 6 is the grip portion case 4 when the cap 6 is attached to the main body case 2. This is in contact with the opening end surface 41 (step surface 41a) and restricts further entry.

  The outer shape of the cap 6 is the same as the outer shape of the gripper case 4. When the cap 6 is attached to the main body case 2, as shown in FIGS. 3 and 4, the outer peripheral surface of the cap 6 and the gripper The outer peripheral surface of the case 4 is flush with the outer peripheral surface. Thereby, the outer peripheral surface of the electric toothbrush 1 becomes a smooth surface, and when the electric toothbrush 1 is housed in a pouch or pocket, there is no possibility that the surrounding thing is caught or the cap 6 is removed.

  Further, when the cap 6 is attached to the main body case 2, the switch member 13 provided in the main body case 2 is included in the cap 6. Therefore, when the electric toothbrush 1 is stored in the pouch or pocket, the switch member 13 is not erroneously turned on.

Next, effects of the electric toothbrush 1 configured as described above will be described below.
(1) According to the present embodiment, the brush mounting shaft for detachably attaching the toothbrush 5 (holding portion 51) to the tip of the main body case 2 is the cylindrical brush mounting shaft tube 11, and the brush mounting shaft tube 11. A motor M having an eccentric weight 29 that generates vibrations is disposed in the inner space S1. Therefore, the tip of the toothbrush 5 can be brought closer to the main body case 2 side by the length of the brush mounting shaft cylinder 11. As a result, the electric toothbrush 1 can be shortened in its entire length, and can easily enter a pouch or a pocket and has excellent portability.

  (2) According to the present embodiment, the toothbrush 5 (holding portion 51) is attached to the brush mounting shaft cylinder 11 in which the motor M having the eccentric weight 29 that generates vibration is attached. Therefore, the brush bristles 52 implanted at the tip of the toothbrush 5 can be brought closer to the motor M. As a result, the vibration of the motor M is difficult to attenuate and is efficiently transmitted to the brush bristles 52, so that the tooth scrubbing performance can be further improved.

  (3) According to the present embodiment, the motor M that generates vibration arranged in the brush mounting shaft cylinder 11 is located at a position farther from the gripping case 4 that is held and fixed by hand, so that the tip of the toothbrush 5 The movement of the part can be increased, and the tooth cleaning performance can be further improved.

  (4) According to this embodiment, the brush mounting shaft cylinder 11 is biased toward the rear surface 10 a side of the main body case 2, and the front surface of the base end portion of the holding portion 51 that holds the brush hairs 52 is retracted toward the rear surface 51 a side. I tried to make it. And the holding part 51 was formed in the toothbrush 5 so that it might become thin toward the front-end | tip part from the base end, and also the front surface of the holding part 51 might approach the rear surface 51a side. As a result, when brushing the teeth, the holding part 51 of the toothbrush 5 does not protrude to the front, and the teeth do not become difficult to brush by hitting the protruding part.

  (5) According to the present embodiment, the main body case 2, the outer case 10 having the brush mounting shaft 11, the motor accommodating portion 27 that accommodates the motor M at one end, and the battery B that accommodates the battery B at the other end. The inner case 20 has a housing portion 22. Therefore, the motor housing portion 27 can be press-fitted and fitted into the brush mounting shaft cylinder 11 of the outer case 10 while the motor M is housed only by housing the inner case 20 in the outer case 10. 11 can be easily assembled.

  (6) According to the present embodiment, the elastic ring R <b> 2 is interposed between the main body case 2, that is, the body portion 21 of the inner case 20 and the grip portion case 4. When the inner case 20 (body portion 21) is housed in the gripping part case 4, the elastic ring R2 is elastically deformed at the inner surface of the upper opening of the gripping part case 4 so that the inner case 20 and the gripping part case 4 The gap was watertight and elastically supported.

  Therefore, the vibration of the motor M accommodated in the motor accommodating portion 27 of the inner case 20 is difficult to be transmitted to the grip portion case 4 by the elastic ring R2, and is concentrated and transmitted to the toothbrush 5 side. As a result, the tooth scrubbing performance can be further improved, and vibrations to the hand gripping the gripping part case 4 can be reduced and the teeth can be brushed comfortably.

  Moreover, since the elastic ring R2 has a sealing property, it is possible to prevent water from entering the main body case 2 through the gap between the gripping case 4 and the inner case 20 when washed with water.

  (7) According to this embodiment, the seal ring R <b> 1 is interposed between the outer case 10 of the main body case 2 and the body portion 21 of the inner case 20. When the electric toothbrush 1 is washed with water, it is possible to prevent water from entering the main body case 2 through the space between the outer case 10 and the inner case 20.

  In addition, the vibration of the motor M housed in the motor housing portion 27 of the inner case 20 becomes difficult to be transmitted to the outer case 10 by the seal ring R1, and is concentrated and transmitted to the toothbrush 5 side. As a result, the tooth scavenging performance can be further improved, and vibrations to the hand holding the outer case 10 can be reduced and the teeth can be brushed comfortably.

  (8) According to this embodiment, the toothbrush 5 attached to the main body case 2 is stored in the cap 6 when not in use. When carrying the electric toothbrush 1. Since the toothbrush 5 (brush bristles 52) does not touch the surroundings, the toothbrush 5 is not contaminated, the pouch and the pocket are not fouled, and hygiene is maintained, and the bristles 52 can be protected without being deformed. High scavenging performance can be maintained. Further, the switch member 13 is not erroneously operated by the surroundings.

  Moreover, the outer shape of the cap 6 is set so that the outer peripheral surface of the cap 6 and the outer peripheral surface of the gripper case 4 are flush with each other when the cap case 6 is mounted. Thereby, the outer peripheral surface of the electric toothbrush 1 becomes a smooth surface, and when the electric toothbrush 1 is housed in a pouch or pocket, it is possible to prevent the surroundings from being caught or the cap 6 from coming off. .

In addition, you may change the said embodiment as follows.
In the above embodiment, the main body case 2 is formed by two members, the outer case 10 and the inner case 20. This may be implemented as the main body case 2 in which the outer case 10 and the inner case 20 are integrated. By doing so, it is possible to reduce the number of parts and the seal ring R1.

  In the above embodiment, the elastic ring R <b> 2 is interposed between the trunk portion 21 of the inner case 20 and the grip portion case 4. This may be carried out by arranging an elastic member at a predetermined interval in the circumferential direction instead of the ring-shaped one.

  In the above embodiment, the elastic ring R2 interposed between the body portion 21 of the inner case 20 and the grip portion case 4 is an O-ring having elasticity and water sealing properties. This may be performed using an elastic member that is elastic only and does not have a sealing property against water.

  In the above embodiment, the elastic ring R <b> 2 is interposed between the grip part case 4 and the inner case 20 of the main body case 2. As shown in FIG. 7, the lower portion of the outer case 10 of the main body case 2 is inserted into the grip part case 4, and the elasticity corresponding to the elastic ring R <b> 2 is provided between the grip part case 4 and the outer case 10. The member R3 may be interposed.

  DESCRIPTION OF SYMBOLS 1 ... Electric toothbrush, 2 ... Main body case, 4 ... Holding part case, 5 ... Toothbrush, 6 ... Cap, 10 ... Outer case, 11 ... Brush mounting shaft cylinder, 20 ... Inner case, 22 ... Battery accommodating part, 27 ... Motor Accommodating portion, 51a ... rear surface, 52 ... brush hair, C1 ... central axis, B ... battery, M ... motor, R1 ... seal ring (main body side seal member), R2 ... elastic ring (gripping side seal member).

Claims (10)

In an electric toothbrush including a main body case that houses a motor as a vibration source, a toothbrush that is attached to the main body case, and a gripping part case that is attached to a base end portion of the main body case,
An electric toothbrush characterized in that a brush mounting shaft cylinder for mounting the toothbrush is provided at a tip portion of the main body case, and a top wall that closes an opening portion of the tip portion is provided in the brush mounting shaft tube. The electric toothbrush according to claim 1,
An electric toothbrush comprising a cap that can be attached to and detached from the main body case and covers the toothbrush. The electric toothbrush according to claim 2,
The outer periphery of the base end portion of the toothbrush is covered with the cap, with the brush bristle side of the end portion of the toothbrush as the tip portion and the main body case side of the end portion of the toothbrush as the base end portion. Electric toothbrush characterized. The electric toothbrush according to claim 2 or 3,
The brush bristle side of the end portion of the toothbrush is a distal end portion, the main body case side of the end portion of the toothbrush is a base end portion, and the brush mounting shaft cylinder is an opening portion on the base end side of the toothbrush The electric toothbrush characterized by being inserted into the toothbrush. In the electric toothbrush according to any one of claims 1 to 4,
The main body case is configured by a combination of an outer case having the brush mounting shaft cylinder and an inner case having a motor housing section for housing the motor, and the motor housing section is disposed in the brush mounting shaft cylinder. An electric toothbrush characterized by being provided. The electric toothbrush according to claim 5,
An electric toothbrush comprising a main body side sealing member for sealing between the outer case and the inner case. The electric toothbrush according to claim 6,
The grip part case is attached to the main body case so that the end face of the base end part of the outer case and the end face of the tip part of the grip part case are opposed to each other, and the inner peripheral surface of the base end part of the outer case The electric toothbrush characterized in that the main body side sealing member is provided between the outer surface of the inner case. The electric toothbrush according to claim 7,
A cross section including a rotation shaft of the motor and the bristles of the toothbrush and parallel to the rotation shaft of the motor is a side cross section, and a front end portion of the bristles of the toothbrush with respect to a central axis of the gripping portion case in the side cross section Of the outer case in the direction along the central axis of the gripping part case, and the side opposite to the front side with respect to the central axis of the gripping part case in the side section. The part located between the toothbrush and the gripping part case is a case intermediate part, and the case intermediate part and the front wall part of the brush mounting shaft cylinder in the side cross section are front wall parts,
The brush mounting shaft tube is continuously provided at the end portion on the toothbrush side in the case intermediate portion;
The front wall portion of the case intermediate portion is provided on the front side with respect to the front wall portion of the brush mounting shaft cylinder, so that a stepped portion is formed at the boundary portion between the case intermediate portion and the brush mounting shaft cylinder. ,
The electric toothbrush, wherein the toothbrush is attached to the main body case so that an end surface of a base end portion of the toothbrush is opposed to an end surface of the stepped portion. In the electric toothbrush according to any one of claims 5 to 8,
A battery housing for mounting the battery is provided in the inner case;
The battery housing is provided in the gripper case;
An electric toothbrush characterized in that a grip-side seal member is provided between an inner peripheral surface of a tip portion of the grip portion case and an outer surface of the inner case. The electric toothbrush according to any one of claims 5 to 9,
A cross section including a rotation shaft of the motor and the bristles of the toothbrush and parallel to the rotation shaft of the motor is a side cross section, and a front end portion of the bristles of the toothbrush with respect to a central axis of the gripping portion case in the side cross section And the side opposite to the front side with respect to the central axis of the gripper case in the side cross section is the rear side, and each of the outer case, the inner case, and the toothbrush is in the side cross section. A front wall portion is a front wall portion, a rear wall portion of each of the outer case, the inner case, and the toothbrush in the side cross section is a rear wall portion, and an outer surface of the front wall portion of the toothbrush in the side cross section. And the outer surface of the rear wall portion of the toothbrush in the side cross section is the rear surface, and the toothbrush bush of the end portion of the toothbrush is The ends of the sheet bristle side and the tip portion, as said proximal end portion of the end portion of the main body case side of the ends of the toothbrush,
In the side cross section, a front wall portion of the inner case is provided on the front side of the motor, and a front wall portion of the outer case is provided on a front side of the front wall portion of the inner case. The electric toothbrush characterized by the front wall part of the said toothbrush being provided in the front side of a part.

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