JPH11235234A - Motor-driven tooth brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven tooth brush by which fitting connection between a slide shaft and a driving shaft is prevented from accidentally coming off. SOLUTION: The slide shaft 3 is contained inside a holder 1 having a brush body 2, the tip of the slide shaft 3 is connected to the brush body 2 with a movement converting mechanism 4, a fitting receiving recessed part 5 is formed in the base end of the slide shaft 3, a fitting shaft part 7 formed in the tip of the driving shaft 6 is projectingly provided in the tip part of a main body case 8, the fitting shaft part 7 is fitted to the fitting receiving recessed part 5 by insertion so as to be freely attachable/detachable and the base end part of the holder 1 is fitted to the tip part of the main body case 8 so as to be freely attachable/detachable. In this case, an abutting part 9 which is abutted on the outer surface of the fitting receiving recessed part 5 freely attachably/ detachably so as to suppress the opening of the fitting receiving recessed part 5 is disposed in the base end part of the holder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder having a brush body on a tip end of a main body cover on which a tip end of a drive shaft is protruded, the reciprocating motion of the drive shaft being converted into a turning motion and being turned. For an electric toothbrush which is detachably mounted.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 12 and 13, a brush body 2 is rotatably provided at a distal end portion of a hollow and substantially cylindrical holder 1, and a slide reciprocated in the holder 1 in the axial direction. The slide shaft 3 is housed, and the tip of the slide shaft 3 and the brush body 2 are connected via a motion conversion mechanism 4 for converting a reciprocating motion to a rotary motion. A fitting receiving portion 5 is formed at the tip of a drive shaft 6 which is reciprocated in the axial direction. The fitting shaft 7 is removably inserted and fitted into the fitting receiving recess 5, and the base end of the holder 1 is detachably attached to the tip of the main body case 8. Electric toothbrushes are known.

In the electric toothbrush, a rib-shaped protrusion 10 is formed on the inner periphery of the fitting receiving recess 5 and a groove-shaped recess 11 is formed on the outer periphery of the fitting shaft 7. When the fitting shaft 7 is inserted and fitted into the fitting receiving recess 5, the protrusion 10 and the recess 11 are detachably locked to each other. The proximal end portion of the slide shaft 3 is formed in an enlarged shape, and a fitting receiving recess 5 which is opened in the axial direction on the base end surface is formed in the enlarged portion. A plurality of slits 13 are formed in the peripheral wall portion of the fitting receiving recess 5 at its inner and outer sides and at the tip edge, and the fitting receiving recess 5 is easily elastically deformed and can be easily expanded and contracted. I have. A groove-like concave step 27 is formed on the outer periphery of the base end portion of the holder 1, and a rib-like convex step 28 is formed on the inner periphery of the distal end opening of the main body case 8. The concave step portion 27 is fitted to the step portion 28, and the base end portion of the holder 1 is inserted and fitted in the opening at the distal end of the main body case 8 so as to be detachably attached.

Therefore, in this case, when used, the slide shaft 3 and the drive shaft 6 can be separated and the holder 1 can be removed from the main body case 8 so that both can be divided and stored compactly. Conversely, in use, the fitting shaft 7 is inserted and fitted into the fitting receiving recess 5 to fit the slide shaft 3 and the drive shaft 6.
And the base end portion of the holder 1 is attached to the front end portion of the main body case 8, so that both can be easily integrated and used. During use, the slide shaft 3 is reciprocated in the axial direction together with the drive shaft 6 by a drive mechanism (not shown) such as a motor built in the main body case 8. , The brush body 2 is rotated, and the brush body 2 performs an automatic and effective brushing operation.

[0005]

However, in the above-mentioned prior art, when a load is applied to the brush body 2 during the brushing operation, the force separating the fitting shaft 7 from the fitting receiving recess 5 causes the force to separate. Works, and when an excessive load is applied,
There is a problem that the fitting receiving concave portion 5 expands and deforms and the fitting between the fitting receiving concave portion 5 and the fitting shaft portion 7 comes off and comes off.

SUMMARY OF THE INVENTION The present invention has been made in order to solve all the problems in the prior art described above, and an object of the present invention is to provide an electric toothbrush capable of removing a holder from a main body case. An object of the present invention is to provide an electric toothbrush in which a fitting shaft portion of a drive shaft is prevented from being accidentally removed from a fitting receiving recess of the shaft.

[0007]

In the electric toothbrush according to the first aspect of the present invention, a brush body is rotatably provided at a tip portion of a hollow and substantially cylindrical holder, and is reciprocated in the axial direction in the holder. The slide shaft is accommodated, and the distal end of the slide shaft and the brush body are connected via a motion conversion mechanism that converts a reciprocating motion to a rotary motion. A fitting shaft portion is formed at the tip of a drive shaft that is reciprocated in the axial direction, and the fitting shaft portion is protruded from a tip portion of the main body case. The mating shaft portion is removably inserted and fitted into the fitting receiving recess,
An electric toothbrush having a base end portion of the holder detachably attached to a distal end portion of the main body case, the electric toothbrush detachably abutting on the base end portion of the holder to an outer surface of a fitting receiving concave portion, and in the corresponding contact state. A contact portion is provided for suppressing the expansion of the fitting receiving recess.

Accordingly, in this case, when not in use, the slide shaft and the drive shaft can be separated and the holder can be removed from the main body case, and the two can be divided and stored compactly. Conversely, at the time of use or the like, the fitting shaft portion is inserted into the fitting receiving concave portion to connect the slide shaft and the drive shaft, and the base end portion of the holder is attached to the distal end portion of the main body case. Can be easily integrated and used. Further, in use, the slide shaft is reciprocated in the axial direction together with the drive shaft, and the reciprocating motion of the slide shaft is converted into a rotational motion by the motion converting mechanism, and the brush body is rotated.
The brush body enables an automatic and effective brushing operation.

Further, at this time, even if an excessive load is applied to the brush body and a strong separating force acts on the fitting portion between the fitting shaft portion and the fitting receiving concave portion, the brush body may be applied to the base end portion of the holder. By making the provided contact portion abut on the outer surface of the fitting receiving concave portion, the expansion deformation of the fitting receiving concave portion is suppressed, and the fitting shaft portion comes off the fitting receiving concave portion carelessly. Is prevented. Also, by releasing the contact state of the contact portion which is detachably contacted, the fitting shaft portion is pulled out from the fitting receiving recess while the fitting receiving recess is expanded and deformed when not in use. By detaching, the slide shaft and the drive shaft can be separated without any trouble.

[0010] The electric toothbrush according to claim 2 of the present invention,
2. The electric toothbrush according to claim 1, wherein a protrusion and a recess are detachably provided between the inner periphery of the fitting receiving recess and the outer periphery of the fitting shaft portion. And

Therefore, in this case, in particular, the projection and the recess are locked with each other in a state where the fitting shaft portion is inserted and fitted into the fitting receiving recess, so that it is provided at the base end portion of the holder. By making the contact portion abut on the outer surface of the fitting receiving concave portion, the fitting shaft portion is more reliably prevented from coming off.

According to a third aspect of the present invention, there is provided an electric toothbrush.
3. The electric toothbrush according to claim 1, further comprising a rotatable operation rotating ring mounted on the outer periphery of the base end portion of the holder, and projecting from the rotation ring into the holder to receive the fitting. A protruding step-shaped abutting portion which is slidably contacted with the outer surface of the recess in the rotating direction is provided.

Therefore, in this case, in particular, by rotating the rotary ring mounted on the outer periphery of the base end portion of the holder, the above-mentioned contact state of the contact portion projecting from the rotary ring can be simplified. Can be attached and detached.

According to a fourth aspect of the present invention, there is provided an electric toothbrush.
4. The electric toothbrush according to claim 3, wherein a slit is formed in the peripheral wall portion of the fitting receiving concave portion, the slit being opened at the inner and outer sides and at the distal end edge, and the rotating ring is rotated to form a convex step abutting portion. And the state in which the expansion of the fitting receiving concave portion is suppressed is released by being in a state where it can enter.

Therefore, in this case, particularly, a slit is formed in the peripheral wall portion of the fitting receiving recess at the inner and outer sides and at the tip edge thereof, and the fitting receiving recess is easily elastically deformed and can be easily expanded and contracted. The fitting shaft can be smoothly attached to and detached from the fitting receiving recess. In addition, by utilizing the slit, the convex contact portion is located in the slit so that it can enter the slit, so that the contact condition that suppresses the expansion of the fitting receiving concave portion is released. It has become so.

An electric toothbrush according to a fifth aspect of the present invention comprises:
3. The electric toothbrush according to claim 1, further comprising an operation slide ring mounted on the outer periphery of the base end portion of the holder so as to be slidable in the axial direction. It is characterized in that a protruding step-shaped contact portion which slides in the axial direction on the outer surface of the concave portion is provided.

Therefore, in this case, in particular, by sliding the slide ring mounted on the outer periphery of the base end portion of the holder in the axial direction, the contact state of the contact portion protruding from the slide ring can be simplified. Can be attached and detached.

An electric toothbrush according to a sixth aspect of the present invention comprises:
3. The electric toothbrush according to claim 1, wherein a base end portion of the holder is detachably fitted to the outside of the front end portion of the main body case, and the main body is attached to an inner periphery on an edge side of the base end portion of the holder. A protruding piece that is detachably engaged with the outer periphery of the distal end portion of the case is protruded, and is abutted against the outer surface of the fitting receiving concave portion on the inner periphery at a position away from the edge of the base end portion of the holder. The protruding step-shaped contact portion is provided.

Therefore, in this case, in particular, the holder can be easily mounted by fitting the base end of the holder to the outside of the front end of the main body case. The protruding projection is locked to the outer periphery of the distal end portion of the main body case, and is securely attached so as not to come off. In addition, a protruding step-shaped abutting portion that abuts on the outer surface of the fitting receiving recess is protrudingly provided on the inner periphery at a position away from the edge of the base end portion of the holder. Attachment / detachment to / from the distal end portion of the main body case allows the contact state of the contact portion to be easily attached / detached at the same time.

[0020]

1 to 3 show the first embodiment of the present invention.
4 shows an embodiment corresponding to FIG. 4, and the electric toothbrush of this embodiment is provided with a brush body 2 rotatably provided at a distal end portion of a hollow and substantially cylindrical holder 1 and reciprocated in the holder 1 in the axial direction. The slide shaft 3 is accommodated, and the distal end of the slide shaft 3 and the brush body 2 are connected via a motion converting mechanism 4 for converting a reciprocating motion to a rotary motion. Forming a fitting receiving concave portion 5 which is deformed and expanded and contracted,
On the other hand, a fitting shaft 7 is formed at the tip of the drive shaft 6 that is reciprocated in the axial direction, and the fitting shaft 7 is protruded from the tip of the main body case 8. The holder 1 is detachably inserted and fitted into the fitting receiving recess 5, and the base end of the holder 1 is detachably attached to the tip of the main body case 8. A contact portion 9 is provided at the base end portion so as to removably contact the outer surface of the fitting receiving recess 5 to prevent the fitting receiving recess 5 from expanding in the corresponding contact state.

Further, in the electric toothbrush of this embodiment, the protrusion 10 and the recess 11 are detachably locked between the inner periphery of the fitting receiving recess 5 and the outer periphery of the fitting shaft 7. Are arranged and formed. A rotatable operating rotation ring 12 is attached to the outer periphery of the base end portion of the holder 1.
A protruding step-shaped abutting portion 9 which penetrates into the holder 1 and is slidably contacted with the outer surface of the fitting receiving concave portion 5 in the rotating direction. Further, a slit 13 is formed in the peripheral wall portion of the fitting receiving concave portion 5 at the inner and outer sides and at the distal end edge thereof, and the rotating ring 12 is rotated so that the convex step-shaped contact portion 9 is located in the slit 13. As a result, the state in which the fitting receiving recess 5 is prevented from expanding can be released.

The brush body 2 is formed by protruding a brush portion 17 from a base portion 16, and is attached to a distal end portion of the holder 1 so that the base portion 16 is rotated about a pivot 18. I have. The brush body 2 is rotated so as to be inverted within a certain angle range. In this case, a cut groove 19 is formed on the outer periphery of the base 16 which is rotatably housed in the tip portion of the holder 1. Is formed, a pin 20 protruding from the tip of the holder 1 is slidably engaged with the cut groove 19, and the pin 20 slides within the range of the cut groove 19, so that the brush body 2 is It is turned around. In addition, the brush body 2 is rotated by converting the reciprocating motion of the slide shaft 3 into a rotational motion via the motion converting mechanism 4. In this case, the connecting piece 21 is attached to the tip of the slide shaft 3.
A pivot shaft 22 is provided at the tip of the connecting piece 21, and the pivot shaft 22 is coupled to the base 16 at a position eccentric to the pivot shaft 18 so as to be rotatable. The connecting piece 21, the pivot 22 and the like constitute the motion conversion mechanism 4.

The base end portion of the slide shaft 3 is formed in an enlarged shape, and a fitting receiving concave portion 5 having a circular hole shape opened in the axial direction on the base end surface is formed in the expanded portion 23. A pair of slits 13 are formed in the peripheral wall portion of the fitting receiving concave portion 5 at opposing positions thereof, and the fitting receiving concave portion 5 is easily elastically deformed and can be easily expanded and contracted. Also, fitting receiving recess 5
A rectangular hole-shaped fitting hole 24 is continuously provided on the inner bottom portion of the shaft. The tip of a drive shaft 6 described later is inserted and fitted into the fitting receiving recess 5 and the fitting hole 24. At this time, a groove-like recess 11 formed on the outer periphery of the fitting shaft 7 at the tip of the drive shaft 6 is attached to and detached from the rib-like protrusion 10 formed on the inner periphery of the fitting receiving recess 5. Locked freely.

A drive mechanism (not shown) such as a motor is built in the main body case 8, and the drive shaft 6 is reciprocated in the axial direction by the drive mechanism. The drive shaft 6 is slidably held in the main body case 8 by a bearing 25, and the tip thereof serves as a fitting shaft portion 7.
Is protruded from the front end opening portion of the main body. The fitting shaft portion 7 is formed in a circular cross section that matches the fitting receiving recessed portion 5, the recessed portion 11 is formed at the base thereof over the entire circumference, and the fitting hole portion is formed at the tip thereof. A protruding shaft portion 26 having a rectangular cross section corresponding to 24 extends. In this case, the fitting hole
The projection shaft 26 is inserted and fitted in the fitting 24 and the fitting receiving recess 5 is fitted.
The fitting shaft 7 is inserted into the fitting shaft, and the base end of the slide shaft 3 and the tip of the driving shaft 6 are removably fitted. At this time, the fitting receiving recess 5 is elastically deformed to expand and contract. I do. A groove-shaped concave step 27 is formed on the outer periphery of the base end portion of the holder 1, and a vertical rib-shaped convex step 28 which is long in the axial direction is formed on the inner periphery of the distal end opening of the main body case 8. The convex step 28 has a concave step
The base 27 of the holder 1 is inserted and fitted into the opening at the distal end of the main body case 8 so as to be detachably attached.

A pair of projecting abutting portions 9 project from the inner periphery of the rotating ring 12 rotatably mounted on the outer periphery of the base end portion of the holder 1 at opposing positions. The width dimension of the contact portion 9 is formed so as to substantially match the opening width dimension of the slit 13. A pair of lateral grooves 29 are formed in the peripheral wall of the holder body 1 at opposing positions, and the contact portions 9 are respectively engaged with the lateral openings 29 so as to be slidable in the circumferential direction. The rotating ring 12 is mounted on the holder 1 so as to be rotatable so as not to move in the axial direction. At this time, the contact portion 9 slides in the circumferential direction within the range of the lateral opening 29, so that the turning range of the turning ring 12 is restricted to approximately 90 degrees. in this case,
As shown in FIG. 3A, the two contact portions 9
Abuts on the outer surface of the fitting receiving recess 5 at a position farthest from the slits 13 and opposed to each other, and the expansion deformation of the fitting receiving recess 5 is effectively suppressed. From this state, the contact portion 9
The sliding ring 12 is brought into sliding contact with the outer surface of the fitting receiving recess 5.
Is rotated approximately 90 degrees in the direction A, as shown in FIG. 3B, the other restriction position is reached, and the rotation of the rotary ring 12 is stopped. In the other regulating position, the two contact portions 9 do not come into contact with the outer surface of the fitting receiving concave portion 5 but come off therefrom, and
At this point, the fitting receiving recessed portion 5 is elastically deformed outward without resistance and can be expanded and deformed.

Therefore, in the electric toothbrush of the present embodiment, when not in use, the slide shaft 3 and the drive shaft 6 are separated from each other, and the holder 1 is removed from the main body case 8 to divide the two into a compact body. Can be. Conversely, in use, the fitting shaft 7 is inserted and fitted into the fitting receiving recess 5 to connect the slide shaft 3 and the drive shaft 6, and the base end of the holder 1 is attached to the distal end of the main body case 8. Therefore, both can be easily integrated and used.
In use, the slide shaft 3 is reciprocated in the axial direction together with the drive shaft 6, and the reciprocating motion of the slide shaft 3 is converted into a rotary motion by the motion converting mechanism 4, whereby the brush body 2 is rotated. The brush body 2 can perform an automatic and effective tooth brushing operation.

Further, even if an excessive load is applied to the brush body 2 during the tooth brushing operation, and a strong separating force acts on the fitting portion between the fitting shaft portion 7 and the fitting receiving concave portion 5, FIG. As shown in a), the contact portion 9 provided on the base end portion (the rotating ring 12 attached to the holder 1) of the holder 1 is brought into contact with the outer surface of the fitting receiving concave portion 5 so that the fitting is completed. Receiving recess 5
Of the fitting shaft portion 7 from the fitting receiving recess 5.
Is prevented from accidentally coming off. FIG.
As shown in (b), by releasing the contact state of the contact portion 9 which is detachably contacted, the fitting receiving recess 5 is expanded and deformed when not in use. With the fitting shaft 7 pulled out, the slide shaft 3 and the drive shaft 6
And can be separated.

Further, in the electric toothbrush of the present embodiment, the protrusion 10 and the recess 11 are mutually locked in a state where the fitting shaft 7 is inserted and fitted into the fitting receiving recess 5, so that By making the contact portion 9 provided at the base end portion of the holder 1 in contact with the outer surface of the fitting receiving concave portion 5, the fitting shaft portion 7 is more reliably prevented from coming off. Further, as shown in FIG. 3, by rotating a rotation ring 12 mounted on the outer periphery of the base end portion of the holder 1, the contact state of the contact portion 9 protruding from the rotation ring 12 is set. Can be easily attached and detached. In this case, a slit 13 is formed in the peripheral wall portion of the fitting receiving recess 5 at its inner and outer sides and at the leading edge, and the fitting receiving recess 5 is easily elastically deformed and can be easily expanded and contracted. The fitting shaft 7 can be smoothly attached to and detached from the fitting receiving recess 5 with little resistance. In addition, the slit 13 is utilized, and as shown in FIG. 3B, the protruding step-shaped contact portion 9 is positioned and can enter the slit 13, thereby expanding the fitting receiving recess 5. The abutment state, which is inhibiting the opening, is easily released.

FIGS. 4 to 7 show another embodiment corresponding to the first, second and fifth aspects of the present invention. The electric toothbrush of this embodiment has an axial direction on the outer periphery of the base end portion of the holder 1 in particular. Attach the slide ring 14 for operation that can slide freely with,
A projecting step-shaped contact portion 9 which penetrates through the slide ring 14 into the holder 1 and slides in the axial direction on the outer surface of the fitting receiving concave portion 5 is provided. In this case, a pair of projecting abutting portions 9 are protruded from the inner periphery of the slide ring 14 at opposing positions thereof, and a pair of vertical groove-like vertical portions are formed at the opposing position on the peripheral wall of the holder body 1. An opening 30 is formed, and the vertical opening
The contact portions 9 are slidably engaged with each other in the axial direction, and the slide ring 14 is mounted on the holder 1 so as not to rotate. At this time, the contact portion 9 is set within the range of the vertical opening 30.
Slides in the axial direction, so that the sliding range of the slide ring 14 is restricted above and below.

In this case, as shown in FIGS.
At the lower regulating position, the abutting portions 9 abut against the outer surface of the fitting receiving concave portion 5 at positions farthest from the slits 13 and oppose each other, and the expanding deformation of the fitting receiving concave portion 5 is effective. Is deterred. From this state, when the slide ring 14 is slid upward in the B direction while the contact portion 9 is slidably contacting the outer surface of the fitting receiving concave portion 5, as shown in FIGS. The sliding of the ring 14 is stopped. At the upper regulating position, the two contact portions 9 do not contact the outer surface of the fitting receiving concave portion 5 but come off upward therefrom, and come into contact with the upper outer peripheral surface of the enormous forming portion 23 which does not expand and contract. In this state, the fitting receiving recess 5 can be elastically deformed outward without resistance and can be expanded and deformed.

Therefore, in the electric toothbrush of the present embodiment, in particular, the slide ring 14 mounted on the outer periphery of the base end portion of the holder 1 is slid in the axial direction to protrude from the slide ring 14. The above-mentioned contact state of the contact portion 9 can be easily operated. In addition,
Otherwise, the configuration is the same as in the above embodiment, and the same operation and effect as in the above embodiment are exerted.

FIGS. 8 and 9 show still another embodiment corresponding to claims 1, 2, and 6 of the present invention. The electric toothbrush of this embodiment has a holder especially on the outside of the front end portion of the main body case 8. The base piece of the holder 1 is detachably attached to the base part of the holder 1, and the convex piece 15 is detachably engaged with the inner circumference of the base end of the holder 1 at the outer periphery of the tip part of the main body case 8. And a protruding step-shaped contact portion 9 that comes into contact with the outer surface of the fitting receiving concave portion 5 on the inner periphery at a position away from the edge of the base end portion of the holder 1. is there.

In this case, on the inner periphery of the base end opening of the holder 1, a pair of convex contact portions 9 and a pair of convex pieces 15 projecting lower than the corresponding contact portions 9 are provided at opposing positions. It protrudes from the top and bottom. On the peripheral wall portion of the holder body 1, a vertically long cut groove 31 is formed which is opened at the base end and inside and outside. The cut groove 31 is formed by the contact portion 9 and the convex piece portion 15.
It is arranged on both sides of. A concave step 32 is formed all around the outer periphery of the front end opening portion of the main body case 8, and the two convex pieces 15 are detachably engaged with the concave step 32.

Therefore, in the electric toothbrush of this embodiment, the base end portion of the holder 1 can be fitted to the outside of the front end opening portion of the main body case 8 and can be easily attached. 15 is engaged with a concave step groove 32 formed on the outer periphery of the distal end portion of the main body case 8, and is securely attached so as not to come off. Moreover, by attaching and detaching the base end portion of the holder 1 to and from the distal end portion of the main body case 8, the contact state of the contact portion 9 can be easily attached and detached at the same time.

Further, in this case, the portion of the holder 1 where the contact portion 9 and the convex portion 15 are protruded is provided with cut grooves 31 on both sides thereof.
Are formed and are easily elastically deformed inwardly and outwardly, so that the convex piece 15 and the concave step groove 32 can be easily locked, and at this time, the fitting receiving recess 5 of the contact portion 9 is formed. Can be attached to and detached from the outer surface without any trouble. 8 and 9 during use.
As shown in FIG. 7, if the two contact portions 9 are brought into contact with the outer surfaces of the fitting receiving recesses 5 at the positions farthest from the slits 13 and opposed to each other, the expansion deformation of the fitting receiving recesses 5 is prevented. Although it is preferable that the holder 1 is effectively suppressed, when the base end portion of the holder 1 is attached to and detached from the outside of the tip end portion of the main body case 8, the holder 1 is substantially removed from the main body case 8 from the same state.
By rotating 90 degrees, both contact portions 9 are
The fitting receiving concave portion 5 is elastically deformed outward and is easily expanded and deformed. Except for this, the configuration is the same as that of the above-described embodiment, and the same operation and effect as those of the above-described embodiment are exerted.

FIGS. 10 and 11 show claims 1 and 2 of the present invention.
6 shows another embodiment corresponding to FIG. 6, and the electric toothbrush of this embodiment is the same as the longitudinal sectional view of the main part shown in FIG. 8, and in this case, the contact portion 9 of the holder 1 Notch grooves 31 are not formed on both sides of the portion where the protruding piece portion 15 protrudes, and the front end portion of the main body case 8 is extended. The contact portion 9 is in contact with the outer surface of the fitting receiving recess 5 without any trouble through the notch opening 33, and the holder 1 is provided outside the front end portion of the main body case 8. The base portion can be detached without any trouble.

In this case, since the contact portion 9 engages with the notch opening 33, the base end portion of the holder 1 is positioned and attached to the tip end portion of the main body case 8. Abuts on the outer surface of the fitting receiving recess 5 at a position farthest from both slits 13 and facing each other.
The holder 1 can be accurately attached so that the expansion deformation of the holder 1 is effectively suppressed. Except for this, the configuration is the same as that of the above-described embodiment, and the same operation and effect as those of the above-described embodiment are exerted.

[0038]

As described above, in the electric toothbrush according to the first aspect of the present invention, the holder and the body case can be divided and housed compactly, and both can be easily integrated. In this case, the abutting portion abuts on the outer surface of the fitting receiving recess, so that the fitting shaft portion is prevented from being accidentally detached from the fitting receiving recess.

In the electric toothbrush according to the second aspect of the present invention, the protrusion and the recess are interlocked with each other in a state where the fitting shaft is inserted and fitted into the fitting receiving recess. When the contact portion is brought into contact with the outer surface of the fitting receiving concave portion, the fitting shaft portion is more reliably prevented from coming off.

Further, in the electric toothbrush according to the third aspect of the present invention, in particular, by rotating the rotating ring mounted on the base end portion of the holder, the contact protrudingly provided on the rotating ring. The contact state of the section can be easily attached and detached.

In the electric toothbrush according to the fourth aspect of the present invention, in particular, the slit is formed so that the fitting receiving recess can be easily expanded and contracted. The mating shaft part can be smoothly attached and detached, and furthermore, the slit is utilized so that the convex contact portion can enter the slit, thereby suppressing the expansion of the fitting receiving recess. The contact state described above is released.

Further, in the electric toothbrush according to the fifth aspect of the present invention, in particular, by sliding a slide ring mounted on the base end portion of the holder, the contact portion protruding from the slide ring is formed. The contact state can be easily operated.

In the electric toothbrush according to the sixth aspect of the present invention, in particular, the base end portion of the holder can be easily attached to the front end portion of the main body case. The holder is securely attached to the outer periphery of the holder, and the contact state of the contact portion can be easily attached and detached simultaneously with attachment and detachment of the base end portion of the holder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an electric toothbrush according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the electric toothbrush in different directions.

FIG. 3A is an enlarged cross-sectional view taken along line WW in FIG.
(B) is an expanded sectional view in the different state in the same section.

FIG. 4 is a vertical sectional view showing a main part of an electric toothbrush according to another embodiment.

FIG. 5 is an enlarged cross-sectional view along XX in FIG. 4;

FIG. 6 is a vertical sectional view of a main part of the electric toothbrush in different states.

FIG. 7 is a vertical partial sectional view of a main part of the electric toothbrush in the same state.

FIG. 8 is a vertical sectional view showing a main part of an electric toothbrush according to yet another embodiment.

9A is a sectional view taken along the line YY in FIG. 8, and FIG. 9B is a sectional view taken along the line ZZ in FIG.

FIG. 10 is an exploded perspective view of a main part of an electric toothbrush according to still another embodiment, in which a slide shaft and a drive shaft are omitted.

FIG. 11 is a sectional view of the electric toothbrush taken along the line YY shown in FIG. 8;

FIG. 12 is a vertical partial sectional view showing a conventional electric toothbrush.

FIG. 13 is a vertical partial cross-sectional view of the electric toothbrush in different directions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder 2 Brush body 3 Slide shaft 4 Motion conversion mechanism 5 Fitting receiving concave part 6 Drive shaft 7 Fitting shaft part 8 Main body case 9 Contact part 10 Protrusion 11 Recess 12 Rotation ring 13 Slit 14 Slide ring 15 Convex piece Department

Claims (6)

[Claims] 1. A brush body is rotatably provided at a distal end portion of a hollow, substantially cylindrical holder, and a slide shaft reciprocating in an axial direction is accommodated in the holder, and a tip of the slide shaft and the brush body are accommodated. Are connected via a motion conversion mechanism that converts a reciprocating motion into a rotational motion, and a fitting receiving recess is formed at the base end of the slide shaft so as to be elastically deformed and expanded and contracted. Forming a fitting shaft at the tip of the drive shaft
The fitting shaft is protruded from the distal end portion of the main body case, and the fitting shaft portion is removably inserted and fitted into the fitting receiving recess, and the base end portion of the holder is fitted to the distal end portion of the body case. A toothbrush detachably attached to an outer surface of a fitting receiving recess at a base end portion of a holder to prevent the fitting receiving recess from expanding in a corresponding contact state. Electric toothbrush provided with. 2. The method according to claim 1, wherein a projection and a recess are provided on the inner periphery of the fitting receiving recess and the outer periphery of the fitting shaft portion so as to be detachably engaged with each other. The described electric toothbrush. 3. A rotatable operation rotating ring is mounted on the outer periphery of a base end portion of the holder, and penetrates into the holder from the rotation ring and is turned on an outer surface of the fitting receiving recess. The electric toothbrush according to claim 1 or 2, wherein a protruding step-shaped contact portion slidably contacted with the protruding portion is provided. 4. A slit is formed in the peripheral wall portion of the fitting receiving concave portion at the inner and outer sides and at the distal end edge thereof, and the rotating ring is rotated so that the protruding contact portion is positioned in the slit. 4. The electric toothbrush according to claim 3, wherein a state in which the expansion of the fitting receiving concave portion is suppressed is released by being obtained. 5. An operation slide ring, which is slidable in the axial direction, is mounted on the outer periphery of the base end portion of the holder, and penetrates through the slide ring into the holder and extends axially on the outer surface of the fitting receiving recess. 3. The electric toothbrush according to claim 1, wherein a protruding step-shaped contact portion to be slid is provided in a protruding manner. 6. A base portion of the holder is fitted to the outside of the tip portion of the main body case so as to be detachably attached thereto. While protruding the protruding piece that is detachably locked,
3. The holder according to claim 1, wherein a protruding step-shaped contact portion that is in contact with an outer surface of the fitting receiving recess is protruded from an inner periphery of the holder at a position away from an edge of the base end portion. electric toothbrush.