CN109982606B

CN109982606B - Tooth brush

Info

Publication number: CN109982606B
Application number: CN201780069904.1A
Authority: CN
Inventors: 北原将嗣
Original assignee: Lion Corp
Current assignee: Lion Corp
Priority date: 2016-11-11
Filing date: 2017-11-10
Publication date: 2021-03-05
Anticipated expiration: 2037-11-10
Also published as: KR20190076946A; JP6789075B2; JP2018075269A; CN109982606A; WO2018088512A1

Abstract

The invention aims to provide a toothbrush which can control the brushing pressure and has flexible operability. The present invention is provided with: a brush head part which is arranged at the front end side and implanted with the hair bundle on the hair implanting surface, a neck part which is arranged at the rear end side of the brush head part and extends to the handle part which is arranged at the rear end side of the neck part and is opposite to the brush head part; the handle part is provided with at least: the neck portion includes a main body portion continuous from the neck portion, a branch portion extending along the main body portion and connected to a tip of the main body portion at one end side thereof in a state of being separated from the main body portion in the width direction, and an elastic holding member integrally holding the main body portion and the branch portion.

Description

Tooth brush

Technical Field

The present invention relates to a toothbrush.

The present application claims priority based on 2016 in Japanese patent application 2016-.

Background

As a function of the toothbrush, it is important to simplify the operation of brushing a desired portion and to avoid excessive brushing pressure during brushing.

Patent document 1 describes a toothbrush in which a "pressing portion" capable of automatically adjusting the deformation of a bristle-implanted portion is provided during operation of the toothbrush, and the inclination of a head portion can be adjusted.

Patent document 2 describes a toothbrush in which a connecting portion for connecting a handle portion and a neck portion is provided, and the brush pressure is controlled by torsional deformation of the connecting portion.

Documents of the prior art

Patent document

[ patent document 1 ] Japanese patent laid-open No. 2016-

[ patent document 2 ] Japanese patent laid-open No. Hei 10-215950

Disclosure of Invention

Problems to be solved by the invention

In the above patent documents 1 and 2, the "pressing portion" or the "connecting portion" displaces the "connecting portion" between the neck portion and the shank portion, thereby bending the neck portion with respect to the shank portion and controlling the brush pressure. Therefore, when the operation pressure is excessive, the brush sweeping pressure is controlled only by the connection portion, and the displacement of the brush head portion with respect to the handle portion becomes large. When the brush head portion is displaced more than necessary, an appropriate brush pressure may not be obtained, and the operation becomes tiger.

An aspect of the present invention has been made in view of the above-described problems of the conventional art, and an object of the present invention is to provide a toothbrush which can control brushing pressure to teeth and has flexible operability.

Means for solving the problems

A toothbrush according to one aspect of the present invention is characterized by comprising: a brush head portion disposed on a front end side and having a bristle implanting surface implanted with tufts, a neck portion provided to extend to a rear end side of the brush head portion, and a shank portion provided to extend to a rear end side of the neck portion opposite to the brush head portion; the handle is provided with at least: the neck portion includes a main body portion continuous from the neck portion, a branch portion extending along the main body portion and connected to a tip end of the main body portion at the other end side in a state where one end side is separated from the main body portion in the width direction, and an elastic holding member integrally holding the main body portion and the branch portion.

In the toothbrush according to one aspect of the present invention, the elastic holding member may be provided to fill a gap between the main body and the branch portion.

In the toothbrush according to one aspect of the present invention, at least a part of the main body portion and the branch portion may be covered with the elastic holding member.

In the toothbrush according to one aspect of the present invention, the side surface of the main body and the inner surface of the branch portion facing the side surface may be parallel to each other, and may have inclined surfaces which are inclined in the same direction in the width direction intersecting the extending direction of the stem portion and which are inclined toward both sides in the width direction as going from the back surface side toward the bristle-implanted surface side.

In the toothbrush according to one aspect of the present invention, a cross-sectional shape intersecting the extending direction of the handle may be a substantially triangular shape having the bristle-implanted surface side as a bottom surface.

In the toothbrush according to one aspect of the present invention, the branch portions may be provided on both sides of the main body portion in the width direction, and each branch portion may extend in a direction away from the main body portion as it goes toward the neck portion side in a state where the elastic holding member is not provided.

In the toothbrush according to one aspect of the present invention, the elastic holding member may be formed of a resin softer than the resin forming the main body portion and the branch portion.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention can provide a toothbrush which can control the brushing pressure on teeth and has flexible operability.

Drawings

Fig. 1A is a plan view of the toothbrush 1.

Fig. 1B is a side view of the toothbrush 1.

Fig. 1C is a sectional view taken along line a-a of fig. 1A.

Fig. 2A is a plan view of the toothbrush body 10A.

Fig. 2B is a side view of the toothbrush body 10A.

Fig. 2C is a sectional view taken along line B-B of fig. 2A.

Fig. 3A shows a sectional view of a state before the handle 16 of the toothbrush 1 is gripped.

Fig. 3B is a sectional view showing a state when the handle portion 16 of the toothbrush 1 is gripped.

Fig. 3C is a sectional view showing a state at the time of brushing.

Fig. 4A is a plan view of the toothbrush 20.

Fig. 4B is a side view of the toothbrush 20.

Fig. 4C is a sectional view taken along the line C-C of fig. 4A.

Fig. 5A is a plan view of the toothbrush 30.

Fig. 5B is a side view of the toothbrush 30.

Fig. 5C is a sectional view taken along line D-D of fig. 5A.

Fig. 5D is a sectional view taken along line E-E of fig. 5A.

[ description of symbols ]

1, 20, 30 … toothbrush, 10B … back, 12 … resilient retention member, 13 … tufts, 14 … head, 14a … bristle-setting face, 15 … neck, 16, 26, 36 … handle, 16A, 26A … body, 16B, 26B … branch, 16A, 26A … body side, 16B, 26B … branch side, 36C … neck, S … slit

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

The embodiments described below are illustrative of one embodiment of the present invention, and are not intended to limit the present invention, and may be modified arbitrarily within the scope of the technical spirit of the present invention. In the drawings, for convenience of viewing the components, the components may be shown in different scales.

[ embodiment 1 ]

The toothbrush structure according to embodiment 1 of the present invention will be described below.

Fig. 1A is a plan view of the toothbrush 1. Fig. 1B is a side view of the toothbrush 1. Fig. 1C is a sectional view taken along line a-a of fig. 1A. Fig. 2A is a plan view of the toothbrush body 10A. Fig. 2B is a side view of the toothbrush body 10A. Fig. 2C is a sectional view taken along line B-B of fig. 2A.

As shown in fig. 1A to 1C, a toothbrush 1 of the present embodiment includes: the toothbrush body 10A constituting the skeleton of the toothbrush 1, the elastic holding member 12 softer than the toothbrush body 10A, and the plurality of tufts 13 are constituted by these 3 main parts.

Specifically, the toothbrush 1 has: a head part 14 of a bristle bundle 13 implanted with a plurality of bristles 13a and disposed at the distal end of the hard toothbrush main body 10A, a neck part 15 provided to extend to the rear end side of the head part 14, and a handle part 16 provided to extend to the rear end (end opposite to the end on the head part 14 side) side of the neck part 15 and having an elastic holding member 12 softer than the toothbrush main body 10A.

The toothbrush body 10A is integrally formed in a long shape as a whole, and may be obtained by injection molding using a resin as a material, for example.

Examples of the material of the toothbrush body 10A include polypropylene resin (PP), polyacetal resin (POM), polystyrene resin (PS), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile-butadiene-styrene resin (ABS), polyarylate resin, polycarbonate resin, and acrylonitrile-styrene resin (AS).

The resin can be used alone in 1, or can be combined with more than 2.

The length of the toothbrush body 10A is not particularly limited, and may be, for example, 100 to 200 mm.

One side in the thickness direction of the head part 14 (hereinafter referred to as an upper surface side) has a bristle surface 14 a. A plurality of implanted holes 14b are formed in the implanted surface 14a, and the tufts 13 having the bristles 13a are implanted in the implanted holes 14 b. In fig. 1A, illustration of the tufts 13 is omitted.

The end portion on the rear end side of the brush head portion 14 in the present embodiment is defined as: when the distance from the outer edge of the implantation hole 14b disposed on the most distal side to the distal end of the brush head portion 14 is L1, it is a position distant from the outer edge of the implantation hole 14b disposed on the most distal side toward the rear end side by a distance L1. That is, as shown in fig. 1A, the brush head portion 14 includes ranges R separated by a distance L1 from the outer edges of the bristle planting holes 14b located at both ends in the longitudinal direction. The position on the rear end side of the range R is the boundary between the head portion 14 and the neck portion 15.

The length of the brush head part 14 is not particularly limited, and is, for example, preferably 10 to 33mm, more preferably 12 to 28 mm. When the lower limit value is not less than the lower limit value, the implantation area of the hair bundle 13 can be sufficiently secured, and when the upper limit value is not more than the upper limit value, the operability in the oral cavity can be further improved.

The width of the brush head part 14, that is, the width in the direction parallel to the bristle surface 14a and perpendicular to the longitudinal direction of the stem part 16 (hereinafter, simply referred to as width) is not particularly limited, but is, for example, preferably 5 to 16mm, more preferably 8 to 12 mm.

The neck portion 15 extends parallel to the bristle surface 14a of the brush head portion 14.

The length of the neck 15 is not particularly limited, but is preferably 35 to 55mm, and more preferably 40 to 50mm, for example. The width of the neck 15 is not particularly limited, but is preferably 3.0 to 5.0mm, and more preferably 3.5 to 4.5mm, for example.

The handle portion 16 extends in parallel with the bristle surface 14a of the brush head portion 14, like the neck portion 15.

The handle 16 of the present embodiment includes: a main body portion 16A continuous from the neck portion 15, a pair of

branch portions

16B, 16B provided on both sides of the main body portion 16A in the width direction, and an elastic holding member 12 that integrally holds the main body portion 16A and the pair of

branch portions

16B, 16B. The elastic holding member 12 linearly extends the

branch portions

16B, 16B and the main body portion 16A in parallel with each other.

As shown in fig. 1A and 1B, the body portion 16A extends linearly from the neck portion 15 and has the same width as the neck portion 15. As shown in fig. 1C, the cross-sectional shape of the body portion 16A intersecting the extending direction of the stem portion 16 is a substantially triangular shape having the surface 10a on the side of the flocked surface 14a as a bottom surface. Therefore, the side surfaces 16A, 16A on both sides in the width direction of the body portion 16A are inclined surfaces extending in the width direction from the back surface 10b side to the front surface 10A side of the toothbrush body 10A.

The pair of

branch portions

16B, 16B extend along the main body portion 16A, and a base portion (the other end) 16c on the other end side is connected to the tip of the main body portion 16A in a state of being separated from the main body portion 16A in the width direction on the tip 16d side. The pair of

branch portions

16B, 16B are integrated with the main body portion 16A by the elastic holding member 12.

As shown in fig. 1C, each of the

branch portions

16B and 16B has a substantially trapezoidal cross section in the width direction. The side surfaces 16B of the

branch portions

16B and 16B are inclined surfaces facing the side surfaces 16A of the body portion 16A and inclined in the same inclination direction as the side surfaces 16A, and are parallel to each other. The inner surfaces of the

branch portions

16B, 16B are inclined toward both sides in the width direction as going from the back surface 10B side to the front surface 10A side of the toothbrush body 10A.

The elastic holding member 12 is provided to fill the gap S, S between the body portion 16A and the branch portions 16B, and the

branch portions

16B, 16B are bonded to the body portion 16A. The

elastic holding members

12, 12 disposed in the slits S, S are substantially V-shaped in cross section in the width direction.

As the material of the elastic holding member 12, a resin material softer than the resin material forming the main body portion 16A, the branch portions 16B, and the like is preferably used, and for example, a resin having a hardness of 40 to 80 is more preferable. In addition to the above hardness conditions, the material of the elastic holding member 12 may be selected in consideration of adhesiveness to the toothbrush main body 10A. For example, when the toothbrush body 10A is made of polypropylene resin, a styrene-based elastomer resin is preferably used as the elastic holding member 12.

In the toothbrush main body 10A of the present embodiment, as shown in fig. 2A, in a state before the elastic holding member 12 is disposed, the

branch portions

16B and 16B extend in a direction away from the main body portion 16A as they move toward the neck portion 15. That is, the

branch portions

16B and 16B in the initial state without the elastic holding member 12 are inclined with respect to the extending direction of the main body portion 16A, and the distal end 16d side thereof is farthest from the main body portion 16A.

Since the toothbrush body 10A of the present embodiment is obtained by injection molding using a mold, the inclined surfaces (the side surfaces 16A and 16B) that function as draft angles are provided in advance in the body portion 16A and the

branch portions

16B and 16B, respectively, and thus the toothbrush body can be easily separated from the mold during one-time molding. Further, the

branch portions

16B and 16B are also advantageous for mold release in that the distal ends 16d and 16d of the

branch portions

16B and 16B are respectively flared toward the body portion 16A.

In the present embodiment, the

branch portions

16B and 16B are formed to have a substantially constant thickness in the extending direction thereof, but the thickness of the base portion 16c side connected to the body portion 16A may be partially set to be thin. When the secondary molding is performed to provide the elastic holding member 12, it becomes easy to fit the toothbrush main body 10A into a secondary mold.

The length of the stem 16 is not particularly limited, but is, for example, preferably 80 to 130mm, more preferably 90 to 120 mm.

Fig. 3A is a sectional view showing a state before the handle 16 of the toothbrush 1 is gripped. Fig. 3B is a sectional view showing a state when the handle 16 of the toothbrush 1 is gripped. Fig. 3C is a sectional view showing a state at the time of brushing.

The toothbrush 1 of the present embodiment has the following structure: when the handle portion 16 is gripped in use, a gripping force is applied from both sides in the width direction, and the shape of the handle portion 16 is changed by the flexibility of the elastic holding member 12.

As shown in fig. 3A, the state before use (before grasping) of the toothbrush 1 is: the main body 16A and the

branch portions

16B and 16B of the handle portion 16 form the same plane, and the front surface 10A and the back surface 10B of the toothbrush main body 10A are flat surfaces.

As shown in fig. 3B, in use of the toothbrush 1, the main body portion 16A of the handle portion 16 is deformed so as to protrude toward the front surface 10a side with respect to the

branch portions

16B, 16B on both sides thereof due to the holding force. In the present embodiment, the main body portion 16A has a triangular cross-sectional shape in the width direction, and the

branch portions

16B, 16B have

side surfaces

16B, 16B inclined in parallel with the side surfaces 16A, 16A of the main body portion 16A. Therefore, when the

branch portions

16B, 16B are brought close to each other by the gripping force, the main body portion 16A is pushed to the surface 10a side by the side surfaces 16B, 16B of the

branch portions

16B, 16B to be displaced. Thereby, the inclination angle between the neck portion 15 and the head portion 14 of the toothbrush 1 is changed to the inclination angle for facilitating brushing the back side of the rear teeth toward the bristle setting surface 14 a.

Further, by reducing the grip strength, the position of the body portion 16A, that is, the positions of the head portion 14 and the neck portion 15 can be restored to the original position.

In the toothbrush 1, since the fulcrum is formed via the flexible elastic holding member 12 filled in the gap S between the main body portion 16A and each of the

branch portions

16B and 16B, the displacement of the main body portion 16A displaced with the base portion 16c as a base point of the connection portion therebetween can be controlled via the fulcrum.

As described above, in the toothbrush 1 of the present embodiment, the main body 16A of the handle portion 16 connected to the head portion 14 and the neck portion 15 of the handle portion 16 is displaced with respect to the

branch portions

16B and 16B due to the flexibility of the handle portion 16, and a tilt toward the surface 10a can be generated between the main body 16A and the neck portion 15 and the head portion 14 connected to the main body 16A. That is, by gripping the handle portion 16, the head portion 14 side can be tilted together with the main body portion 16A, and the deflection change can be adjusted more easily than a configuration in which only the head portion 14 is deflected.

The inclination of the head part 14 between the main body part 16A and the head part 14 can be adjusted by the grip force of the handle part 16. This is advantageous when brushing the inner or back side of a tooth, deep in the posterior teeth, which is difficult to brush. The brush bristles reach a portion which is difficult to brush, so that brushing is easy, and cleaning of teeth can be performed well.

In addition, when a force is applied to the head 14 in a direction perpendicular to the bristle-implanted surface 14a during use, the toothbrush 1 of the present embodiment is in the following state: the portion between the head portion 14 and the body portion 16A is pressed back to the back surface 10b side. At this time, if the displacement of the head part 14 toward the back surface 10B side (displacement of the main body part 16A with respect to the branch part 16B) becomes large, the brushing pressure against the teeth cannot be sufficiently obtained, and the tooth cleaning performance is degraded, but in the toothbrush 1 of the present embodiment, since the

branch parts

16B, 16B and the main body part 16A are integrally configured with the elastic holding member 12 in the extending directions of each, the displacement of the head part 14 toward the back surface 10B side (displacement of the main body part 16A with respect to the branch part 16B), that is, the head part 14 side is not excessively bent toward the back surface 10B side of the toothbrush 1, and an appropriate brushing pressure against the teeth can be obtained.

In this way, since the elastic holding member 12 gives elasticity to the head part 14, excessive brushing pressure can be absorbed, and therefore, the cleaning performance of the teeth is improved without damaging the gums. On the other hand, since the

branch portions

16B, 16B are not deformed, the handle portion 16 can be gripped, and flexible operability can be ensured. In the present embodiment, the handle portion 16 is also improved in the soft feeling effect, and thereby the toothbrush 1 can be easily fitted to the hand.

As described above, according to the present embodiment, it is possible to provide the toothbrush 1 which can control the brushing angle and the brushing pressure with respect to the teeth by holding the handle 16 and which has flexible operability.

[ 2 nd embodiment ]

Next, the structure of the toothbrush 20 according to embodiment 2 of the present invention will be described.

The basic structure of the toothbrush 20 of the present embodiment shown below is substantially the same as that of the above-described embodiment 1, but the structure of the handle 26 is different. Therefore, in the following description, a configuration different from the above embodiment will be described in detail, and a description of the same parts will be omitted. In the drawings used in the description, the same components as those in fig. 1A to 3C are denoted by the same reference numerals.

Fig. 4A is a plan view of toothbrush 20. Fig. 4B is a side view of toothbrush 20. Fig. 4C is a sectional view taken along line C-C of fig. 4A.

As shown in fig. 4A, the toothbrush 20 according to embodiment 2 includes a handle 26 having a wide finger contact portion 21, and has a shape in which the tip end side of the handle 26 is swollen. The finger contact portion 21 is formed in an approximately circular or elliptical shape in a plan view viewed from the normal direction of the flocked surface 14 a.

The finger contact portion 21 includes wide portions 126 provided on the distal end 26d sides of the

branch portions

26B, 26B located on both sides of the body portion 26A. The wide width portion 126 is curved so as to protrude outward in the width direction, and has a shape in which the width dimension thereof gradually changes in the longitudinal direction of the toothbrush 20.

In the present embodiment, for example, the maximum width dimension of the finger contact portion 21 is set to about 1.5 times the width dimension of the grip region of the toothbrush 20.

The 1 st side surface 26B1 of the branch portion 26B faces the side surface 26A of the main body portion 26A at a substantially constant interval as a whole. On the other hand, the 2 nd side surface 26B2 of the branch portion 26B in the finger contact portion 21 is bent outward in the width direction, and therefore, the distance between the side surface 26B and the side surface 26A of the main body portion 26A is partially different. Since the gap is wider than other portions, the amount of resin of the elastic holding member 12 disposed between the main body portion 26A and the branch portion 26B increases accordingly.

In the present embodiment, the side surfaces 26B (the 1 st side surface 26B1, the 2 nd side surface 26B2) of the respective branch portions 26B are also inclined in the same manner as the inclination of the side surfaces 26A, 26A of the main body portion 26A that is triangular in cross-sectional view. Thus, by grasping the handle portion 26, the main body portion 26A can be displaced relative to the branch portions 26B, and the brush head portion 14 side can be tilted together with the main body portion 26A. Thus, as in the above-described embodiment, the brush can be made to reach the deep back teeth where brushing is difficult, and cleaning of the teeth can be performed satisfactorily.

Further, the elasticity of the handle portion 26 can alleviate excessive brushing pressure in the brush head portion 14, and at the same time, an appropriate brushing pressure can be obtained, so that the cleaning performance is improved.

In the present embodiment, since the finger contact portion 21 is provided on the neck portion 15 side of the handle portion 26, the toothbrush 20 is more resistant to sliding when held. This enables stable gripping of the toothbrush 20, thereby improving operability.

[ embodiment 3 ]

Next, the structure of the toothbrush 30 according to embodiment 3 of the present invention will be described.

The basic structure of the toothbrush 30 of the present embodiment shown below is substantially the same as that of the above-described embodiment 1, but the structure of the handle 36 is different. Therefore, in the following description, a configuration different from the above embodiment will be described in detail, and a description of the same parts will be omitted. In the drawings used in the description, the same components as those in fig. 1A to 3C are denoted by the same reference numerals.

Fig. 5A is a plan view of toothbrush 30. Fig. 5B is a side view of toothbrush 30. Fig. 5C is a sectional view taken along line D-D of fig. 5A. Fig. 5D is a sectional view taken along line E-E of fig. 5A.

As shown in fig. 5A, the toothbrush 30 of embodiment 3 has: a toothbrush body 10A and an elastic holding member 12 partially covering the outer surface of the toothbrush body 10A.

The handle portion 36 of the toothbrush 30 is composed of a main body portion 16A provided to be connected to the head portion 14 and the neck portion 15 of the toothbrush main body 10A,

branch portions

16B, 16B on both sides thereof, and an elastic holding member 12 covering the main body portion 16A and the

branch portions

16B, 16B.

The handle 36 has: an expanded portion 36A provided on the neck portion 15 side, an expanded portion 36B provided on the opposite side to the neck portion 15, and a necked portion 36C provided between these expanded

portions

36A, 36B. The outer contour of the grip 36, i.e., the outer contour of the elastic holding member 12, is formed by a curved surface that makes the respective

swollen portions

36A, 36B and necked portion 36C appear smooth.

The position of the constriction 36C in the longitudinal direction can be set arbitrarily. In the present embodiment, the swollen portion 36B on the rear end side of the toothbrush 30 is longer than the swollen portion 36A on the neck portion 15 side, and the swollen portion 36A functions as the finger contact portion 31 when gripping the toothbrush 30.

The elastic holding member 12 is formed with the following thickness: the main body portion 16A and the

branch portions

16B and 16B can be covered over their entire surfaces, and the outer shapes thereof are not reflected on the surface 33a of the elastic holding member 12. The thickness of the elastic holding member 12 may be the same on the front surface 10a side and the back surface 10b side, or may be different. For example, it is preferable to increase the thickness of the front surface 10a side because a high bonding effect can be obtained.

The elastic holding member 12 may be made of the same material as the elastic holding member 12. The material and thickness dimension of the elastic holding member 12 are selected so as not to hinder displacement of the main body portion 16A relative to the

branch portions

16B, 16B.

In the present embodiment, as shown in fig. 5B, the front surface 36a and the back surface 36B of the stem 36 on the neck 15 side gradually expand outward from the neck 15 side toward the back end side. In this manner, in the grip portion 36, the relation between the displacement region of the brushhead portion 14 and the gripping force and displacement amount with respect to the grip portion 16 can be adjusted by setting the shape of the bulge portion 36A close to the neck portion 15 to a shape in which the thickness gradually changes from the neck portion 15 side.

In the present embodiment, the main body portion 16A and the

branch portions

16B and 16B are entirely covered with the elastic holding member 12 made of a soft resin material. Thus, the body portion 16A of the shank portion 36 is displaced together with the elastic holding member 12. The displacement of the main body 16A is transmitted to the hand of the user via the holding member, and the gripping force can be adjusted by the tactile sensation.

In the present embodiment, the brush head 14 is bent together with the main body portion 16A in the same manner as in the previous embodiment, so that the brush can reach a portion difficult to brush, for example, when brushing the deep teeth. Therefore, brushing becomes easy, and cleaning of teeth can be performed satisfactorily. Further, since the elastic holding member 12 has flexibility, excessive brush pressure can be alleviated, and appropriate brush pressure can be obtained, so that the workability is good and the cleaning performance is improved.

Since the thickness and shape of the elastic holding member 12 can be appropriately changed, even a person with a weak grip can easily grip the elastic holding member, and the operability and cleaning efficiency can be improved by setting the thickness and shape of the grip portion 36 to match the hand of a user such as an adult or a child.

In addition, the present invention may have the following structure: when the gap S, S between the main body portion 16A and each of the

branches

16B and 16B is filled with the elastic holding member 12, only at least a part of the main body portion 16A and each of the

branches

16B and 16B is covered.

While preferred embodiments of the present invention have been described above with reference to the drawings, it is needless to say that the present invention is not limited to these examples. It should be understood that various changes and modifications within the technical spirit described in the patent claims will be apparent to those skilled in the art, and these are also within the technical scope of the present invention.

For example, in the configuration of embodiment 1, the handle portion 16 may be provided with a finger contact portion. In this case, the surface of the distal end side (neck portion 15) of the body portion 16A may be formed into a concave-convex or concave shape to serve as a finger contact portion. This improves the grippability of the handle portion 16, and facilitates the operation of the toothbrush 1.

Industrial applicability

The present invention can be applied to a toothbrush which can control brushing pressure on teeth and has flexible operability.

Claims

1. A toothbrush is characterized in that a toothbrush head is provided,

the disclosed device is provided with: a brush head part which is arranged at the front end side and has a bristle implanted surface implanted with bristle bundles, a neck part which is arranged to extend to the rear end side of the brush head part, and a handle part which is arranged to extend to the rear end side of the neck part opposite to the brush head part,

the handle is provided with at least: a main body portion continuous from the neck portion, a branch portion extending along the main body portion and connected to a tip end of the main body portion at the other end side in a state where one end side is separated from the main body portion in the width direction, and an elastic holding member integrally holding the main body portion and the branch portion,

in a width direction intersecting with an extending direction of the shank,

the side surface of the main body and the inner surface of the branch portion facing the side surface are parallel to each other, and have the same inclination direction and are inclined toward both sides in the width direction as going from the back surface side to the hair-planting surface side.

2. The toothbrush of claim 1, wherein the resilient retention member is configured to fill a gap between the main body portion and the branch portion.

3. The toothbrush according to claim 2, wherein at least a part of the main body part and the branch part is covered with the elastic holding member.

4. The toothbrush according to any one of claims 1 to 3, wherein a cross-sectional shape of the body portion intersecting with the extending direction of the stem portion is substantially triangular with a surface on the implanted hair side as a bottom surface.

5. The toothbrush according to any one of claims 1 to 3,

the branch portions are provided on both sides of the main body portion in the width direction,

in a state where the elastic holding member is not provided, each of the branch portions extends in a direction away from the main body portion as it goes toward the neck portion side.

6. The toothbrush according to any one of claims 1 to 3, wherein the elastic holding member is formed of a resin softer than a resin forming the main body portion and the branch portion.

7. A toothbrush is characterized in that a toothbrush head is provided,

8. The toothbrush of claim 7, wherein the resilient retention member is configured to fill a gap between the main body portion and the branch portion.

9. The toothbrush according to claim 8, wherein at least a portion of the main body part and the branch part is covered with the elastic holding member.

10. The toothbrush according to any one of claims 7 to 9, wherein the elastic holding member is formed of a resin softer than a resin forming the main body portion and the branch portion.