JPH1023928A - Oral cavity sanitation instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the attachment strength of an oral cavity sanitation instrument, to efficiently transmit vibrations or reciprocative motions to the oral cavity sanitation instrument and further, to facilitate cleaning inside a holding cylinder. SOLUTION: This instrument is composed of a main body 4 of motor-driven toothbrush, for which a supporting shaft part 21 is provided at an upper wall part 20 of a casing 2 while being protruded and a holding cylinder 22 inclining its upper edge down forward is formed while being protruded so as to surround the supporting shaft part 21, and a spare brush 5 to be freely attachably and detachably fitted to the main body 4 of motor-driven toothbrush while turning a brush 32 forward. This spare brush 5 has an outer cylinder 33 internally fitted to the holding cylinder 22 and an inner cylinder 34, which is provided inside this outer cylinder 33 while interposing a loop-shaped groove, externally fitted to the supporting shaft part 21 at its lower end part and planarly press- contacts the outer surface of the outer cylinder 33 onto the inner surface of the holding cylinder 22 while being attached to the main body 4 of motor-driven toothbrush.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oral hygiene device which enhances the mounting strength of an oral hygiene implement and facilitates cleaning of a mounting portion.

[0002]

2. Description of the Related Art As an oral hygiene device, for example, there is an electric toothbrush which applies vibration to a replacement brush by rotating an eccentric weight with an electric motor. With this type of electric toothbrush,
While vibrating the replacement brush, the brush is pressed against the tooth and brushed, but depending on the user,
The brush may be brushed with the hand while vibrating the replacement brush. However, when brushing by hand, force is applied to the hand and the brushing pressure is increased, and a large load is applied to the mounting portion of the replacement brush. For this reason, the attachment strength of the replacement brush to the electric toothbrush main body needs to be sufficiently increased in consideration of brushing by hand.

In order to satisfy such a demand, for example, Japanese Utility Model Laid-Open No. 5-4918 discloses a column-shaped pedestal 102 formed at one end of a casing 101 of an electric toothbrush main body as shown in FIG. A support shaft 103 is formed at the center of the pedestal 102 so as to protrude concentrically with the pedestal 102, and a pair of large and small fitting recesses 105 externally fitted to the pedestal 102 and the support shaft 103 are formed at the base end of the replacement brush 104. , 106 are formed concentrically, and the pedestal 102 and the support shaft 103 are fitted into the fitting recess 105,
An electric toothbrush is described in which the replacement brush 104 is fixedly held on the casing 101 by being fitted into the casing 106 in a press-fit manner.

Japanese Utility Model Publication No. 48-31723 discloses an electric toothbrush main body 1 as shown in FIGS.
A holding member 113 for holding the base end of the brush 112 is provided at the end of the casing 111 of the tenth case.
A spindle 114 is attached to a substantially central portion of the spindle 11.
4, the holding member 113 is fixed to the casing 111, and a spindle 114 is attached to the center of the replacement brush 112, and the replacement brush 1 is fixed by the spindle 114 and the holding member 113.
An electric toothbrush 116 configured to fix 12 to a casing 111 is described. This electric toothbrush 1
In 16, a plurality of slits 113 a are formed in the holding member 113, the holding member 113 is divided into a plurality of locking claws 113 b, and the annular groove 115 formed on the outer periphery near the base end of the replacement brush 112 is formed. The locking claw 113b is engaged to restrict the movement of the replacement brush 112 in the axial direction.

[0005]

In the electric toothbrush shown in FIG. 11, since the base end of the replacement brush 104 is externally fitted to the pedestal 102 and the support shaft 103, the casing 101 is provided.
The vibration of the casing 101 can be sufficiently transmitted to the replacement brush 104 by increasing the contact area between the replacement brush 104 and the replacement brush 104. However, sinking occurs during molding due to the influence of uneven thickness at the base end of the replacement brush 104. However, there is a problem that the fitting is likely to be loose.

On the other hand, in the electric toothbrush shown in FIGS. 12 and 13, a metal support shaft 1 fixed to a casing 111 is provided.
Since the replacement brush 112 is attached to the replacement brush 112 and the replacement brush 112 is fixed to the electric toothbrush main body 110, the mounting strength of the replacement brush 112 can be sufficiently secured.
Since the casing 4 is formed of a member different from the casing 111, the number of parts increases and the assembling work becomes complicated.

Further, since the base end of the replacement brush 112 is held by the holding member 113, the attachment strength of the replacement brush 112 to the electric toothbrush main body 110 is increased by that amount, but the replacement brush 112 is restricted to move in the axial direction. To do
Since the distal end of the holding member 113 is engaged with the annular groove 115 at the base end of the replacement brush, a gap 117 (see FIG. 12) is formed between the middle of the holding member 113 and the replacement brush 112. . That is, the main function of the holding member 113 is to prevent the replacement brush 112 from coming off.
It can be said that it has not contributed much to the increase in the mounting strength.

Therefore, the present applicant has filed Japanese Patent Application No. 7-1103.
No. 39, an electric toothbrush main body in which a support shaft portion is provided in a protruding shape at a tip end portion of a casing, and a holding cylinder is provided in a protruding shape concentrically with the support shaft portion, and a replacement brush detachably attached to the electric toothbrush main body. An outer cylinder fitted in the holding cylinder at the base end portion, and an inner cylinder concentrically provided inside the outer cylinder via an annular groove and fitted externally to the support shaft. Then, the present invention has proposed an electric toothbrush having a replacement brush in which the outer surface of the outer cylinder is pressed against the inner surface of the support cylinder in a state of being attached to the electric toothbrush main body. However, there is a problem that it is difficult to clean the attached matter such as the toothpaste adhered in the holding cylinder.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oral hygiene device having a high attachment strength for an oral hygiene device, capable of efficiently transmitting vibrations and reciprocating movements to the oral hygiene device, and of easily cleaning the inside of a holding cylinder. It is to provide a device.

[0010]

According to the present invention, there is provided an oral hygiene device comprising: a support shaft having a protruding support shaft formed at an upper end portion of a casing; and a support cylinder having an upper edge inclined forward and downward. An oral hygiene device that is formed to protrude so as to surround the part, and an oral sanitary device that is detachably attached to the oral hygiene device body with the contact surface to teeth, gums, and the like facing forward. An outer cylinder fitted inside the holding cylinder and an inner cylinder provided inside the outer cylinder with an annular groove interposed and fitted externally to the support shaft, and attached to the body of the oral hygiene device. And an oral hygiene tool in which the outer surface of the outer tube is pressed against the inner surface of the holding tube in a planar state.

Here, the inclination angle of the upper edge of the holding cylinder with respect to the axis of the support shaft portion is set to 70 ° to 30 °.
As described in claim 3, the holding cylinder is formed with a holding slit extending upward from the vicinity of the lower end and having an open upper end in the front part of the holding cylinder, as described in claim 3. Forming a cleaning slit extending in a circumferential direction at a lower rear portion of the holding cylinder, wherein the supporting shaft and the holding cylinder are integrally formed with a casing of the body of the oral hygiene device as described in claim 5. As described in Item 6, it is a preferred embodiment to provide an attachment restricting means that allows the oral hygiene device to be attached to the oral hygiene apparatus main body only in a state where the contact surface to the teeth or gums is on the front side. is there.

[0012]

In the oral hygiene device according to the first aspect of the present invention, the spindle provided on the body of the oral hygiene device is fitted inside the inner cylinder formed at the lower end of the oral hygiene implement, and the inner cylinder is pivoted with the inner cylinder. Holding the part, the holding cylinder provided on the oral hygiene device main body is externally fitted to the outer cylinder formed at the lower end of the oral hygiene device, and the outer surface of the outer cylinder is brought into surface contact with the inner surface of the holding cylinder. Thus, the oral hygiene device is attached to the oral hygiene device main body. Therefore, the brushing pressure is received by the holding cylinder and the spindle. In addition, since the contact area between the oral hygiene device main body and the oral hygiene implement increases, the vibration and the reciprocating motion are efficiently transmitted to the oral hygiene implement. Since the upper edge of the holding cylinder is formed so as to be inclined downward from the front side, the flow of the tap water in the holding cylinder is improved when the attached matter such as the toothpaste adhered to the holding cylinder is washed away with the tap water. Therefore, the attached matter is easily washed away, and the operability of the cleaning tool in the holding cylinder is improved even when cleaning is performed with a cleaning tool such as a cotton swab, so that the attached matter is easily cleaned. In addition, since the inside of the holding cylinder can be easily visually recognized, the attached matter can be removed neatly. In addition, since a large brushing pressure does not act on the upper end portion of the front part of the holding cylinder, even if the upper edge of the holding cylinder is formed to be inclined downwardly to the front side, the mounting strength of the oral hygiene tool is reduced. It does not decline.

According to a second aspect of the present invention, when the inclination angle of the upper edge of the holding cylinder with respect to the axis of the support shaft is set within a range of 70 ° to 30 °, the brushing pressure is increased between the front part and the rear part of the holding cylinder. And the cleanability of the inside of the holding cylinder is improved. According to a third aspect of the present invention, when the holding cylinder is formed with a holding slit extending upward from the vicinity of the lower end of the holding cylinder and having an open upper end at the front part of the holding cylinder, the elastic deformation of the holding cylinder in the expanding / contracting direction is used for holding. Since it is possible through the slit, even if the inner diameter of the holding cylinder or the outer diameter of the outer cylinder of the oral hygiene tool fluctuates due to manufacturing errors, the outer cylinder can be reliably held by the holding cylinder. Become.

According to a fourth aspect of the present invention, if a cleaning slit extending in the circumferential direction is formed at a lower rear portion of the holding cylinder, drainage after use is improved. Further, the inside of the holding cylinder can be washed with water while draining from the cleaning slit, or the inside of the holding cylinder can be cleaned by inserting a cleaning tool such as a cotton swab from the cleaning slit. Moreover, since the brushing pressure hardly acts on the lower rear portion of the holding cylinder, there is almost no decrease in the mounting strength of the oral hygiene tool due to the formation of the cleaning slit.
When the support shaft and the holding cylinder are integrally formed with the casing of the body of the oral hygiene device, the number of parts constituting the body of the oral hygiene device is reduced, and the assembling work is simplified. As described in claim 6, when the mounting control means is provided so that the oral hygiene tool can be mounted on the oral hygiene apparatus main body only in a state where the contact surface to the teeth, gums, etc. is on the front side,
It is possible to prevent an installation error in which the oral hygiene device is attached to the oral hygiene device main body in a front-to-rear direction.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the oral hygiene device of the present invention is applied to an electric toothbrush. As shown in FIGS. 1 and 2, the electric toothbrush 1 is detachably attached to an electric toothbrush main body 4 having a substantially cylindrical casing 2 with a built-in vibration generating means 3 and an upper end of the casing 2 of the electric toothbrush main body 4. And a replacement brush 5 as an oral hygiene tool to be used.

The vibration generating means 3 applies vibration to the entire casing 2 around the upper end portion by the centrifugal force of the eccentric weight 12 rotated by the electric motor 11. In addition, the code | symbol 10 in a figure has shown the battery.

As shown in FIGS. 1 to 6, an upper end portion of the casing 2 is closed by an upper wall portion 20, and a support shaft portion 21 protruding upward is provided at a substantially central portion of the upper wall portion 20. 2 are formed integrally. In addition, a holding cylinder 22 that protrudes upward concentrically with the support shaft portion 21 so as to cover the lower half of the support shaft portion 21 near the outer periphery of the upper wall portion 20,
It is formed integrally with the casing 2.

The upper half of the holding cylinder 22 is cut forward and downward, and the inclination angle α of the upper edge of the holding cylinder 22 with respect to the axis X is:
As described later, within the range of 70 ° to 30 °, preferably 5 °
It is set to around 0 °. A holding slit 23 is formed at a front portion of the holding tube 22 and extends to a lower end thereof, and an elliptical (oval) extending in a circumferential direction is formed at a lower rear portion of the holding tube 22.
Cleaning slit 24 is formed. An engagement concave portion 25 is formed on the front side near the lower end of the support shaft portion 21, and a flat rotation restricting portion 26 is formed on the upper portion of the support shaft portion 21. However, the spindle 21 may be formed of a member different from the casing 2. In addition, it is preferable that the opening area of the cleaning slit 24 is set as large as possible within the range of strength.

As shown in FIGS. 1 and 2, the replacement brush 5 is detachably attached to the electric toothbrush body 4 with the brush 32 facing forward. The lower portion of the replacement brush 5 is smoothly enlarged in diameter along the outer surface of the casing 2, and an outer cylinder 33 is formed which is fitted inside the holding cylinder 22 and can be pressed against the inner surface of the holding cylinder 22. The support shaft 2 is provided inside the outer cylinder 33.
1 is connected to the outer cylinder 33 through the annular groove 35.
And are formed concentrically. A regulating protrusion 39 is formed on the outer surface of the outer cylinder 33 as attachment regulating means that can be fitted to the holding slit 23, and the replacement brush 5 is attached to the holding cylinder 22 in the front-rear direction by the regulating protrusion 39. Is prevented.

A fitting recess 36 in which the rotation restricting portion 26 is non-rotatably mounted is formed so as to be continuous with the internal space of the inner cylinder 34. The inner cylinder 34 is divided into a front half cylinder 34a and a rear half cylinder 34b through a pair of left and right slits 37 extending in the vertical direction, and near the lower end of the inner peripheral surface of the front half cylinder 34a, An engagement projection 38 engageable with the engagement recess 25 is formed in a protruding shape. The front part of the annular groove 35 is formed deeper than the rear part. Note that an engagement concave portion may be formed in the front half cylinder 34a, and an engagement convex portion that engages with the engagement concave portion may be formed in the support shaft portion 21.

In the electric toothbrush 1, the casing 2
Of the replacement brush 5 is fitted inside the inner cylinder 34 of the replacement brush 5, and the holding cylinder 22 of the casing 2 is fitted outside the outer cylinder 33 of the replacement brush 5, and the support shaft 21 is held by the inner cylinder 34. The replacement brush 5 is mounted on the casing 2 by holding the outer surface of the outer tube 33 in pressure contact with the inner surface of the holding tube 22 and further engaging the engaging protrusion 38 with the engaging recess 25. . The vibration generated by the vibration generating means 3 is transmitted to the casing 2.
The brush is then transmitted to the replacement brush 5 and the teeth are brushed using the vibration of the brush 32.

The inclination angle α of the upper edge of the holding section 22 is obtained as follows. As shown in FIG. 6, the brushing pressure is P, the distance from the center of the brush 32 to the lower end of the replacement brush 5 is L1,
Assuming that the distance to the lower end of the holding cylinder 22 is L2, the load P1 acting on the rear upper end of the holding cylinder 22 is expressed by the equation P1 = P · L1 / L2, and the load P2 acting on the front lower end of the holding cylinder 22 is
P2 = P · (L1−L2) / L2 can be roughly calculated. By the way, the distance L3 from the upper end to the lower end in front of the holding cylinder 22 is set to a short constant value in order to secure the cleanability of the inside of the holding cylinder 22, so that if the inclination angle α is reduced, the distance L2 becomes As the load becomes longer, the loads P1 and P2 become smaller, which is preferable in terms of strength. However, since the upper end of the holding cylinder 22 becomes sharp,
Not very desirable in handling. On the other hand, when the inclination angle α is increased, the opposite phenomenon occurs. For this reason, the inclination angle α is in the range of 70 ° to 30 °, preferably 50 °, so that there is no trouble in handling and the design is excellent, and the loads P1 and P2 acting on the holding cylinder 22 can be reduced as much as possible. It is set before and after.

Next, the operation and effect of the electric toothbrush 1 will be described. Since the support shaft portion 21 is fitted inside the inner cylinder 34 and the outer surface of the outer cylinder 33 is pressed against the inner surface of the holding cylinder 22 in a planar manner, the contact area between the casing 2 and the replacement brush 5 increases, The vibration of the vibration generating means 3 is efficiently transmitted to the replacement brush 5 via the casing 2. For this reason, the brushing performance is greatly improved. In addition, since the holding slit 22 is formed with the holding slit 23 and the outer peripheral portion of the outer cylinder 33 is held by utilizing the elasticity of the material of the holding cylinder 22, manufacturing errors of the holding cylinder 22 and the outer cylinder 33 are reduced. While absorbing, the outer cylinder 33 can be securely held by the holding cylinder 22 with a strong force, so that the mounting strength of the replacement brush 5 is increased and the vibration is efficiently transmitted.

The brushing pressure is received by the support shaft 21 and the holding cylinder 22, and the inner cylinder 34 is divided into front and rear half cylinders 34a and 34b to enhance the elasticity. Is prevented from acting on the shaft 21 material. For this reason, the support shaft 2
1 and the holding cylinder 22 can be formed integrally with the casing 2, so that the number of components constituting the electric toothbrush 1 can be reduced and the assemblability of the electric toothbrush 1 can be improved.

The relative movement of the replacement brush 5 with respect to the support shaft 21 in the axial direction is restricted by the concave-convex relationship between the engaging convex portion 38 and the engaging concave portion 25. 36, the rotation of the brush 5 around the axis thereof is regulated, and the engagement relationship between the engagement protrusion 38 and the engagement recess 25 is maintained.
Is reliably prevented from falling off.

Since the annular groove 35 is formed between the inner cylinder 34 and the outer cylinder 33, the thickness of the lower end of the replacement brush 5 can be made relatively thin, and the lower end of the replacement brush 5 during molding can be formed. Part thickness unevenness can be prevented. Further, since the first half of the annular groove 35 is formed as a deep groove, the engagement and disengagement between the engagement projection 38 and the engagement recess 25 can be relatively easily performed, and the second half of the annular groove 35 is formed as a shallow groove. Since it is formed, it is possible to effectively receive the load in the orthogonal direction of the planting surface that acts during brushing.

Since the upper edge of the holding cylinder 22 is formed so as to be inclined forward and downward, when the attached matter such as the toothpaste adhered to the inside of the holding cylinder 22 is washed away with tap water, the holding cylinder 2 is not used.
The flow of the tap water in the inside 2 is improved, and the washing of the deposits is facilitated.
Even in the case of cleaning the inside, since the operability of the cleaning tool in the holding cylinder 22 is improved, it is easy to clean the attached matter.
In addition, since the inside of the holding cylinder 22 is easily visually recognized, the attached matter can be removed neatly. Further, since a large brushing pressure does not act on the upper end portion of the front portion of the holding cylinder 22, the mounting strength of the replacement brush 5 does not decrease.
Further, by providing the holding slit 23 and the cleaning slit 24 in the holding cylinder 22, the flow of tap water in the holding cylinder 22 at the time of cleaning becomes even smoother, and a cleaning tool such as a cotton swab in the holding cylinder 22. Is further improved, so that the cleanability of the inside of the holding cylinder 22 is significantly improved. Moreover, since the brushing pressure hardly acts on the lower rear end of the holding cylinder 22, there is almost no reduction in the mounting strength of the replacement brush 5 due to the formation of the cleaning slit 24.

As shown in FIG. 8, an annular head 50 is formed at the tip as an oral hygiene tool instead of the replacement brush 5, and a rubber member 51 having a sharp tip is formed on the head 50. As shown in FIG. 9, the attached gingival nipple massage device 52 or a gingival massage device 55 in which a bag-shaped rubber member 53 is attached to the distal end and a plurality of protrusions 54 are formed on the upper surface of the rubber member 53 are provided. It is also possible to use. In this embodiment, the regulating protrusion 39 is formed on the outer cylinder 33 as an attachment regulating means for preventing the replacement brush 5 from being attached to the holding cylinder 22 in the front-rear direction. As shown, while the support shaft portion 21 is eccentric with respect to the holding cylinder 22, the inner cylinder 34 is eccentric with respect to the outer cylinder 33,
As shown in FIG. 10B, the rotation restricting portion 2 of the support shaft portion 21
6 is formed in a semi-cylindrical shape, or as shown in FIG. 10C, a step 56 is formed in the middle of the replacement brush 5 so as to abut on the upper surface of the holding cylinder 33 so that the outer surface of the replacement brush 5 22 may be configured to be smoothly connected to the outer surface. However, as long as the replacement brush 5 can be prevented from being attached to the front and rear oppositely, attachment restricting means having a configuration other than the illustrated one may be provided.

[0029]

According to the oral hygiene device according to the present invention,
Since the load at the time of brushing is received by the holding cylinder and the support shaft portion, it is possible to increase the attachment strength of the oral hygiene implement to the oral hygiene apparatus main body. In addition, since the contact area between the oral hygiene device main body and the oral hygiene tool is increased, vibration and reciprocating motion are efficiently transmitted to the oral hygiene tool, and the brushing performance can be improved.

Further, by forming a holding slit at the front portion of the holding cylinder, the holding cylinder can be elastically deformed in the expanding / contracting direction via the holding slit. Even if the inner diameter dimension or the outer diameter dimension of the outer tube of the oral hygiene device fluctuates, the outer tube can be securely held by the holding tube, which increases the mounting strength of the oral hygiene device and transmits vibration. Will also be done efficiently. Furthermore, since the front upper end of the holding cylinder where the brushing pressure hardly acts is cut out, and the upper edge of the holding portion is inclined downward to the front side, without lowering the mounting strength of the oral hygiene tool, The inside of the holding cylinder can be easily and neatly cleaned.

Since the brushing pressure is distributed between the holding cylinder and the spindle, the brushing pressure acting on the spindle is greatly reduced. Therefore, in the vibration-type oral hygiene device, the holding cylinder and the support shaft can be formed integrally with the casing of the oral hygiene device main body, and the number of components constituting the oral hygiene device can be reduced. In addition, the manufacturing cost can be reduced, and the assemblability of the oral hygiene apparatus can be greatly improved. Providing attachment restricting means that enables the oral hygiene device to be attached to the oral hygiene device main body only in a state where the contact surface to the teeth or gingiva is on the front side, the oral hygiene device with respect to the oral hygiene device main body It is possible to prevent a mounting error in which the holding cylinder is mounted in the front-rear direction, and to prevent a problem that the brushing load acts on the upper end of the holding cylinder on the holding slit side and the holding cylinder is damaged.

[Brief description of the drawings]

FIG. 1 is a front view of an electric toothbrush main body and a replacement brush according to an embodiment of the present invention.

FIG. 2 is a cutaway side view of a main part of the electric toothbrush.

FIG. 3 is a vertical cross-sectional view showing the vicinity of a connection portion between the main body and the replacement brush of the electric toothbrush.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a plan view of the main body of the electric toothbrush.

FIG. 6 is an explanatory diagram of brushing pressure acting on the electric toothbrush.

FIG. 7 is a bottom view of a replacement brush for the electric toothbrush.

FIG. 8 is a perspective view of a teat massage device.

FIG. 9 is a perspective view of a gum massage device.

10 (a) is a cross-sectional view of the vicinity of the lower end of the holding cylinder of the electric toothbrush, and FIG.
Is a cross-sectional view of the vicinity of the rotation restricting portion of the electric toothbrush, and (c) is a vertical cross-sectional view of the vicinity of a connection portion between the main body of the electric toothbrush and the replacement brush.

FIG. 11 is a longitudinal sectional view of a main part of a conventional electric toothbrush.

FIG. 12 is a longitudinal sectional view of a main part of another conventional electric toothbrush.

FIG. 13 is an exploded perspective view of a main part of the electric toothbrush.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electric toothbrush 2 Casing 3 Vibration generation means 4 Electric toothbrush main body 5 Replacement brush 10 Battery 11 Electric motor 12 Eccentric weight 20 Upper wall part 21 Support shaft part 22 Holding cylinder 23 Holding slit 24 Cleaning slit 25 Engaging recess 26 Rotation Regulator 32 Brush 33 Outer cylinder 34 Inner cylinder 35 Annular groove 36 Fitting recess 37 Slit 34a Front half cylinder 34b Rear half cylinder 38 Engagement projection 39 Regulation projection 50 Head 51 Rubber member 52 Nipple massage tool 53 Rubber member 54 Projection 55 Gingival Massager 56 Step

Claims (6)

[Claims] 1. An intraoral sanitary device main body having a support shaft formed at an upper end portion of a casing in a protruding shape, and a holding cylinder having an upper edge inclined downward and forward so as to surround the support shaft. An oral hygiene device removably attached to the oral hygiene device main body with a contact surface for teeth, gums, and the like facing forward, and an outer cylinder internally fitted to a holding cylinder at a lower end thereof; An inner cylinder which is provided inside the outer cylinder with an annular groove interposed therebetween, and which is externally fitted to the support shaft, wherein the outer surface of the outer cylinder faces the inner surface of the holding cylinder in a state where the outer cylinder is attached to the oral hygiene device main body. An oral hygiene device comprising: 2. The oral hygiene device according to claim 1, wherein the inclination angle of the upper edge of the holding cylinder with respect to the axis of the support shaft is set within a range of 70 ° to 30 °. 3. A holding slit formed in a front portion of the holding cylinder and extending upward from near a lower end portion and having an open upper end.
Or the oral hygiene device according to 2. 4. The oral hygiene device according to claim 1, wherein a cleaning slit extending in a circumferential direction is formed in a lower rear portion of the holding cylinder. 5. The oral hygiene device according to claim 1, wherein the support shaft and the holding cylinder are formed integrally with a casing of the oral hygiene device main body. 6. The apparatus according to claim 1, further comprising an attachment restricting means for enabling the oral hygiene device to be attached to the oral hygiene apparatus main body only in a state in which a contact surface to the teeth, gingiva and the like is on the front side. An oral hygiene device according to the item.