WO2017051777A1

WO2017051777A1 - Toothbrush

Info

Publication number: WO2017051777A1
Application number: PCT/JP2016/077451
Authority: WO
Inventors: 良祐蜂須賀; 小林　利彰
Original assignee: ライオン株式会社
Priority date: 2015-09-25
Filing date: 2016-09-16
Publication date: 2017-03-30
Also published as: CN108024619A; MY192003A; JPWO2017051777A1; JP6858703B2; JP2021074606A; KR20180058218A; JP7166372B2; CN108024619B

Abstract

The objective of the present invention is to provide a toothbrush with which it is possible to prevent injury within the oral cavity of a user. This toothbrush includes: a head portion (14) having a flocking surface (21-1b) on the distal end side in the axial direction; a handle portion (16) which is disposed on the rear end side, in the axial direction, of the head portion, and includes a handle portion body (31); and a deformable portion (15A) which deforms under an axial-direction load acting on the head portion; wherein the deformable portion deforms under a load of 30 N or less.

Description

toothbrush

The present invention relates to a toothbrush, and more particularly to a toothbrush that can suppress damage to a user's oral cavity.
This application claims priority based on Japanese Patent Application No. 2015-188040 filed in Japan on September 25, 2015 and Japanese Patent Application No. 2015-188042 filed on September 25, 2015 in Japan. , The contents of which are incorporated herein.

Conventionally, when a toothbrush is used (specifically, when the toothbrush is held in the mouth), it may cause an oral trauma, especially when the toothbrush user is an infant of 1 to 3 years old Many cases suffer from oral trauma.

Conventionally, there is a toothbrush disclosed in Patent Document 1 as a toothbrush that can suppress a head portion and a neck portion from being broken or broken.
Patent Document 1 discloses a toothbrush in which a coating layer made of a soft resin covering 70% or more of the total surface area of the head portion and the neck portion is formed on the surface of a base made of hard resin. ing. Patent Document 1 discloses that the total thickness of the head part and the neck part (the total thickness of the base and the coating layer covering the base) is 3 to 5 mm. It is disclosed that the thickness of the base constituting the neck portion is 2 to 4 mm, and the thickness of the coating layer is 0.5 to 2 mm (preferably 0.8 to 1.5 mm).

In Patent Document 1, by adopting the above configuration, even when an excessive load is applied to the head portion or the neck portion, it becomes possible to make the handle body difficult to break, or the head portion or the neck portion is broken. Even in such a case, it is disclosed that it is possible to suppress the exposure of the broken portion by the coating layer. In the toothbrush disclosed in Patent Document 1 having the above-described configuration, since the base constituting the distal end portion of the head portion is covered with a soft resin, the toothbrush is strongly bitten, or the distal end of the head portion hits the oral cavity strongly. When this is done, the soft resin functions as a cushioning material.
For this reason, by using the toothbrush disclosed in Patent Document 1, it is possible to suppress damage in the oral cavity caused by the tip of the head.

JP 2013-458 A

The neck portion of the toothbrush disclosed in Patent Document 1 is thinner than the base and is made of a soft resin so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck portion. A coating layer (preferably a thickness of 0.8 to 1.5 mm) is provided. The head portion of the toothbrush disclosed in Patent Document 1 is, for example, when an external force is applied in the extending direction of the toothbrush (specifically, the direction from the rear end to the front end of the toothbrush). It is difficult to bend so that the external force transmitted to the tip of the head portion is sufficiently released so that the head is not damaged.
Therefore, when a strong external force is applied in a direction from the rear end of the toothbrush to the tip in the state where the toothbrush disclosed in Patent Document 1 is held in the mouth, the user's oral cavity may be damaged.

The present invention has been made in consideration of the above points, and an object thereof is to provide a toothbrush capable of suppressing damage in the oral cavity of a user.

According to the first aspect of the present invention, a head portion having a flocked surface on the front end side in the axial direction, a handle portion disposed on the rear end side in the axial direction from the head portion, and including a handle portion body; There is provided a toothbrush comprising: a deforming portion that is deformed by a load in the axial direction with respect to the head portion, wherein the deforming portion is deformed when the load is 30 N or less.

Further, in the toothbrush according to one aspect of the present invention, the deforming portion is deformed when the load is 5 N or more.

Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: Between the said flocked surface and the said handle part, the width | variety of the 1st direction orthogonal to the said flocked surface and the 2nd direction orthogonal to the said axis orthogonal direction The neck portion having the maximum width or less of the head portion is disposed.

In the toothbrush according to the aspect of the present invention, the deforming portion is disposed on the neck portion, and the bending strength in the first direction in the deforming portion is S1, and the bending direction in the second direction in the deforming portion is When the bending strength is S2, the relationship of S1 / S2> 1.5 is satisfied.

Further, in the toothbrush according to one aspect of the present invention, a plurality of the deforming portions are arranged.

Further, in the toothbrush according to the aspect of the present invention, the plurality of deforming portions have different deformation directions.

Further, in the toothbrush according to one aspect of the present invention, the deformable portion is disposed at least between the flocked surface and the handle portion.

Further, in the toothbrush according to one aspect of the present invention, the deforming portion is further disposed on the handle portion.

Further, in the toothbrush according to one aspect of the present invention, a hard member that is disposed from the head portion to a part of the distal end side of the handle portion and is formed of a hard resin, the flocked surface, and the handle portion. It is arranged on the rear end side from the deformation part arranged in between, and at least a part of the hard member is housed therein, and includes a soft part formed of a soft resin.

Further, in the toothbrush according to one aspect of the present invention, at least a tip portion of the head portion is made of the soft resin.

Further, in the toothbrush according to the aspect of the present invention, the hard member between the flocked surface and the handle portion has a width in a first direction orthogonal to the flocked surface, the axial direction and the first It is characterized by being larger than the second width in the second direction orthogonal to the direction of 1.

Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: The said hard member in the said head part contains the base member which has the said flocked surface and a plurality of flocking holes, and the said soft resin is the said flocked surface and the said plural It is arrange | positioned so that a part of said base member may be covered in the state which exposed the flock hole of this.

In the present invention, the direction perpendicular to the axis is the direction in which the shaft passes through the front end side end portion of the head portion and the rear end side end portion of the handle portion. In this case, when the extending direction of the head portion and the extending direction of the handle portion coincide with each other, the length direction of the toothbrush and the axial direction coincide with each other, and the extending direction of the head portion and the extending direction of the handle portion match. If they do not match, the length direction of the toothbrush may not match the axial direction.

According to the second aspect of the present invention, the head portion having a flocked surface on the front end side, and the handle portion disposed on the rear end side from the head portion and including a handle portion main body, the flocked surface; A deformable portion disposed between the handle portion and deformed by an external force applied to the head portion; a hard member disposed from the head portion to the rear end side of the handle portion and formed of a hard resin; There is provided a toothbrush characterized by including a soft portion that is disposed on the rear end side from the deformable portion and accommodates at least a part of the hard member therein and is formed of a soft resin.

The toothbrush according to one aspect of the present invention is characterized in that the toothbrush includes a second deforming portion that is disposed on the handle portion and is deformed by the external force.

Further, in the toothbrush according to the aspect of the present invention, the handle portion includes at least one ring-shaped depression portion with a reduced diameter with respect to the extending direction of the handle portion, and the second deformable portion. Is arranged at the position of the depression.

Further, in the toothbrush according to one aspect of the present invention, the hollow portion is coaxial with the handle portion and has a cross-sectional shape similar to the cross-sectional shape of the handle portion.

Further, in the toothbrush according to the aspect of the present invention, the end portion on the rear end side of the hard member is located on the rear end side with respect to the second deformable portion.

Further, in the toothbrush according to the aspect of the present invention, the bending strength of the deforming portion is smaller than the bending strength of the second deforming portion.

Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: As for the said deformation | transformation part, the bending strength of the 1st direction orthogonal to the said flocked surface is the length direction of the said handle | steering-wheel part, and the said 1st direction. The bending strength in the second direction orthogonal to the second direction is greater.

Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: As for the said hard member between the said flocked surface and the said handle part, the 1st width | variety in a said 1st direction is 2nd in a said 2nd direction. It is characterized by being larger than the width.

Further, in the toothbrush according to the aspect of the present invention, the hard member includes, in the handle portion, a columnar first protruding portion that protrudes and is exposed at least toward the flocked surface side, and the flocked surface in the handle portion. It has the column-shaped 2nd protrusion part which protrudes and exposes on the opposite side, It is characterized by the above-mentioned.

In the toothbrush according to the aspect of the present invention, the first protrusion is exposed through a first opening formed on the flocked surface side of the soft part, and the second protrusion is It exposes through the 2nd opening part formed in the opposite side to the said flocked surface side of a soft part, It is characterized by the above-mentioned.

Further, in the toothbrush according to the aspect of the present invention, the tip surface of the first projecting portion and the tip surface of the second projecting portion are flush with the outer surface of the handle portion.

Further, in the toothbrush according to the aspect of the present invention, a part of the hard member, which is disposed on the rear end side of the handle portion with respect to the first protrusion and the second protrusion, The shape is such that the diameter becomes smaller toward the rear end side of the handle portion.

Moreover, in the toothbrush which concerns on the one aspect | mode of the said invention, between the said flocked surface and the said handle part, it is 2nd orthogonal to the 1st direction orthogonal to the said flocked surface, and the length direction of the said handle part. A neck portion whose width in the direction is equal to or less than the maximum width of the head portion is arranged.

According to the toothbrush of the present invention, damage to the user's oral cavity can be suppressed.

It is a side view of the toothbrush which concerns on 1st Embodiment of this invention. It is a front view of the toothbrush shown in FIG. It is a rear view of the toothbrush shown in FIG. It is the side view to which the hard member shown in FIG. 1 was expanded. It is the front view which expanded the hard member shown in FIG. It is the rear view which expanded the hard member shown in FIG. FIG. 5 is a cross-sectional view of the hard member shown in FIG. 4 in the AA line direction. FIG. 5 is a cross-sectional view of the hard member (specifically, a first portion) shown in FIG. 4 in the BB line direction. FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the CC line direction. FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the DD line direction. It is sectional drawing which shows the manufacturing process of the toothbrush of 1st Embodiment, and is a figure for demonstrating the process of forming a hard member using a 1st metal mold | die. It is sectional drawing which shows the manufacturing process of the toothbrush of 1st Embodiment, and is a figure for demonstrating the process of forming 1st soft resin, a soft part, and a handle | steering-wheel main body using a 2nd metal mold | die. . It is a figure for demonstrating the load provision test with respect to the toothbrush. It is a figure for demonstrating the load provision test with respect to the toothbrush. It is a figure which shows the result of having implemented the load provision test with respect to the toothbrush. It is a figure for demonstrating the three-point bending test with respect to the toothbrush. It is a figure for demonstrating the three-point bending test with respect to the toothbrush. It is a figure which shows the result of having implemented the three-point bending test with respect to the toothbrush. It is a side view which shows the modification of the toothbrush which concerns on embodiment of this invention. It is a front view of the toothbrush shown in FIG. It is a side view of the toothbrush which concerns on 2nd Embodiment of this invention. It is a front view of the toothbrush shown in FIG. It is a rear view of the toothbrush shown in FIG. It is the side view to which the hard member shown in FIG. 21 was expanded. It is the front view which expanded the hard member shown in FIG. It is the rear view to which the hard member shown in FIG. 23 was expanded. It is sectional drawing which shows the manufacturing process of the toothbrush of 2nd Embodiment, and is a figure for demonstrating the process of forming a hard member using a 1st metal mold | die. It is sectional drawing which shows the manufacturing process of the toothbrush of 2nd Embodiment, and is a figure for demonstrating the process of forming 1st soft resin, a soft part, and a handle | steering-wheel main body using a 2nd metal mold | die. . It is a side view which shows the modification of the toothbrush which concerns on 2nd Embodiment. It is a front view of the toothbrush shown in FIG.

Hereinafter, an embodiment to which the present invention is applied will be described in detail with reference to the drawings. Note that the drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimensions, etc. of each part shown in the drawings may be different from the actual dimensional relationship of the toothbrush. is there.

[First Embodiment]
Hereinafter, a first embodiment of a toothbrush of the present invention will be described with reference to FIGS. 1 to 20. Note that the drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimensions, etc. of each part shown in the drawings may be different from the actual dimensional relationship of the toothbrush. is there. Here, for example, both hard resin and soft resin are used, and an example in which a neck portion having a maximum width of the head portion or less is arranged between the head portion and the handle portion will be described.

FIG. 1 is a side view of a toothbrush according to an embodiment of the present invention. FIG. 2 is a front view of the toothbrush shown in FIG. In FIG. 2, for convenience of explanation, illustration of the brush portion 12 constituted by the plurality of hair bundles 12-1 shown in FIG. 1 is omitted. FIG. 3 is a rear view of the toothbrush shown in FIG.
4 is an enlarged side view of the hard member shown in FIG. FIG. 5 is an enlarged front view of the hard member shown in FIG. 6 is an enlarged rear view of the hard member shown in FIG.

In the structures shown in FIGS. 1 to 6, the same components are denoted by the same reference numerals. 1 to 6 indicate the extending direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used. The Z direction shown in FIGS. 1 and 4 indicates a first direction (normal direction) orthogonal to the flocked surface 21-1b when the toothbrush 10 is not used. 2, 3, 5, and 6 indicate the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction). 4 to 6, the reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also shown for convenience of explanation.

1 to 6, the toothbrush 10 according to the present embodiment includes a handle body 11 and a brush portion 12. The handle body 11 includes a head part 14, a neck part 15, a handle part 16, a head part 14, a neck part 15, and a hard member 17 constituting a part of the handle part 16. In the present embodiment, the neck portion between the flocked surface 21-1b and the handle portion 16 has a width in the second direction (Y direction) smaller than the width of the head portion 14 (maximum width in the Y direction). The toothbrush 10 in which 15 is arrange | positioned is demonstrated.

The head unit 14 includes a base member 21 made of a hard resin and a first soft resin 22 that covers a part of the base member 21. The base member 21 is a part of the constituent elements of the hard member 17 made of hard resin, and has a base member main body 21-1 and two support portions 21-2. The base member body 21-1 reduces the outer shape of the head portion 14 by about 1 to 2 mm so that the first soft resin 22 can be disposed on the side surface and the bottom surface 21-1a of the base member body 21-1. The shape is different. The base member main body 21-1 has a tip end portion 21-1A, a bottom surface 21-1a, a flocked surface 21-1b, and a flocked hole 21-1B.

The tip portion 21-1A is a portion of the base member main body 21-1 located on the side opposite to the side where the head portion 14 and the neck portion 15 are connected. The distal end portion 21-1A is a portion facing the user's oral cavity when the user brushes his / her teeth using the toothbrush 10. The shape of the tip portion 21-1A may be, for example, a rounded shape (round shape).

FIG. 7 is a cross-sectional view of the hard member shown in FIG. Referring to FIG. 1, FIG. 3, FIG. 4, FIG. 6, and FIG. 7, the bottom surface 21-1a is a portion covered with the first soft resin 22, and is disposed on the opposite side of the flocked surface 21-1b. ing. The bottom surface 21-1a can be a flat surface, for example.

The flocked surface 21-1b is a flat surface. The flocked surface 21-1b exposes a plurality of flocked holes 21-1B. The flocked surface 21-1b is exposed from the first soft resin 22 as a first exposed portion of the head portion 14. In this way, the base member main body 21-1 is configured using a hard resin harder than the first soft resin 22, and the plurality of flocked holes 21-1 B and the flocked surfaces 21-1 b are formed from the first soft resin 22. By exposing, the hair bundle 12-1 that constitutes the brush portion 12 can be implanted (planted) into the plurality of planting holes 21-1B by using the flat-line planting method.

When the first soft resin 22, the soft part 26, and the handle part main body 31 are resin-molded using the second mold 51 shown in FIG. -2 (refer to FIG. 12). In this way, when the flocked surface 21-1b comes into contact with the inner surface of one mold 51-2 constituting the second mold 51, the plurality of flocked holes 21-1B and the flocked surface 21-1b have a first The formation of the soft resin 22 can be suppressed.

A plurality of flocking holes 21-1B are provided in the base member main body 21-1 on the side constituting the flocking surface 21-1b. The flocking hole 21-1B is a hole into which the hair bundle 12-1 constituting the brush portion 12 is flocked. For example, the arrangement shown in FIG. 2 can be used as the arrangement of the plurality of flock holes 21-1B. However, the arrangement is not limited to this, and any arrangement such as a so-called grid-like arrangement or a staggered arrangement may be used. It may be an array pattern. Further, the number of the flocking holes 21-1B is not limited to the number of flocking holes 21-1B shown in FIG. 2, and can be set as appropriate within a range of 10 to 60 holes, for example. That is, the arrangement of the plurality of flocking holes 21-1B and the number of flocking holes 21-1B can be appropriately set according to the purpose.

The shape of the flock hole 21-1B is not particularly limited, and for example, a perfect circle shape, a circular shape such as an ellipse, a polygonal shape such as a triangular shape or a quadrangular shape, or the like can be used. Further, the diameter of the flock hole 21-1B can be determined according to the thickness of the hair bundle 12-1, and can be appropriately set within a range of 1 to 3 mm, for example.

When the thickness of the head portion 14 in the Z direction is 5.0 mm, the thickness of the base member main body 21-1 in the Z direction (in other words, the thickness between the bottom surface 21-1a and the flocked surface 21-1b) is For example, it can be set to 4.2 mm. In this case, the depth of the plurality of flocking holes 21-1B with respect to the flocking surface 21-1b can be set to, for example, 2.5 mm. As an example, the thickness of the head portion 14 is a thickness measured at a central portion of the head portion 14 in the X direction.

The two support portions 21-2 are provided so as to protrude in the Z direction (downward in the case shown in FIG. 1) from the bottom surface 21-1a of the base member main body 21-1. One of the two support portions 21-2 is disposed on the front end side of the base member main body 21-1, and the other is disposed on the rear end side of the base member main body 21-1. The two support portions 21-2 are arranged to face each other in the X direction. The two support portions 21-2 each have a protruding surface 21-2a that is a flat surface. The two protruding surfaces 21-2 a are exposed from the outer surface of the first soft resin 22 and are flush with the outer surface of the first soft resin 22. That is, as shown in FIG. 3, the support portion 21-2 is exposed as the second exposed portion of the head portion 14 on the side opposite to the flocked surface 21-1b.

When the hard member 17 including the base member main body 21-1 is molded using the first mold 41 shown in FIG. 11 to be described later, the protruding surface 21-2a is the first mold 41 (see FIG. 11). It is a part which contacts the inner surface of the. As described above, the protruding surface 21-2a is in contact with the inner surface of the first mold 41 (see FIG. 11), whereby the first soft resin 22 is formed around the two support portions 21-2 and the bottom surface 21-1a. Can be formed.

That is, the protrusion amount of the two support portions 21-2 (in other words, the distance to the protrusion surface 21-2a with respect to the bottom surface 21-1a) is the first soft resin 22 arranged on the bottom surface 21-1a. Is equal to the thickness in the Z direction. Therefore, the protruding amounts of the two support portions 21-2 can be appropriately set according to the thickness of the first soft resin 22 disposed on the bottom surface 21-1a. When the thickness of the head portion 14 in the Z direction is 5.0 mm and the thickness of the base member main body 21-1 in the Z direction is 4.2 mm, the protruding amount of the two support portions 21-2 is, for example, 0 .8 mm. The thicknesses of the head portion 14 and the base member main body 21-1 are, for example, thicknesses measured at the center portion of the head portion 14 in the X direction.

1 and 3, the case where there are two support portions 21-2 has been described as an example, but the number of support portions 21-2 may be one or more, and is not limited to two.

The rear end of the base member 21 configured as described above is configured integrally with the distal end portion of the core portion 25 (one end of the core portion 25). As the hard resin constituting the base member 21, a resin harder than the first soft resin 22 is used. Specifically, as the hard resin constituting the base member main body 21-1, for example, a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa can be used.

Specific examples of such a hard resin include, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS). And acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), and the like. The said hard resin may be used individually by 1 type, and may be used in combination of 2 or more type as appropriate.

The first soft resin 22 has a side surface of the base member main body 21-1 and a side surface of the base member main body 21-1 in a state where the flocked surface 21-1b, the plurality of flocked holes 21-1B, and the end surfaces 21-2a of the two support portions 21-2 are exposed. It is provided so as to cover the bottom surface 21-1a. Thus, the first soft resin 22 is disposed so as to cover the tip portion 21-1A of the base member main body 21-1.

In this way, by arranging the first soft resin 22 so as to cover the tip portion 21-1A of the base member main body 21-1, the user can place the toothbrush 10 at the tip portion 21-1A. Since the first soft resin 22 functions as a cushioning material, an external force is applied in the direction from the rear end side to the front end side of the toothbrush 10, and the first soft resin 22 disposed at the front end 21-1A is used. It is possible to prevent the user's oral cavity from being damaged when strongly pressed into the user's oral cavity.

The thickness of the first soft resin 22 disposed on the side surface and the bottom surface 21-1a of the base member main body 21-1 can be appropriately set within a range of 0.2 to 2.0 mm, for example, depending on the purpose. Although it is possible, it can be 0.8 mm, for example.

1 to 3, as an example, the case where the first soft resin 22 is provided so as to cover the side surface and the bottom surface 21-1a of the base member body 21-1 has been described as an example. The soft resin 22 may be disposed so as to cover at least the tip portion 21-1A of the base member main body 21-1.

As the first soft resin 22, for example, a soft resin having a hardness of JIS K 7215 Shore A of 90 or less may be used. Examples of such a soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, and polyester elastomers. Among them, styrene elastomers are preferable from the viewpoint of weldability with polypropylene (PP). . Specific examples of the styrenic elastomer include, for example, Kuraray Co., Ltd. Septon (trade name), Riken Technos Co., Ltd. Rheostomer (trade name), and the like.

Further, the first soft resin 22 may be appropriately selected according to the type of hard resin constituting the base member 21. Specifically, when polypropylene (PP) is used as the hard resin constituting the base member 21, the first soft resin 22 is preferably a polyolefin elastomer or a styrene elastomer, and more preferably a styrene elastomer. . By making the combination of the hard resin and the first soft resin 22 constituting the base member 21 the above combination, sufficient adhesion between the base member 21 and the first soft resin 22 can be ensured. it can.

The length (length in the X direction) of the head portion 14 having the above-described configuration is not particularly limited, and is preferably in the range of 10 to 30 mm, and more preferably in the range of 12 to 28 mm. When the length of the head portion 14 is 10 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 can be implanted. Moreover, the operativity of the toothbrush 10 in an intraoral area can be improved as the length of the head part 14 is 30 mm or less.

The width of the head portion 14 configured as described above (the maximum width in the Y direction in the head portion 14) is not particularly limited, and is preferably in the range of 7 to 13 mm, and more preferably in the range of 8 to 12 mm. When the width of the head portion 14 is 7 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 is implanted. Moreover, the operativity of the toothbrush 10 in oral cavity can be improved as the width | variety of the head part 14 is 13 mm or less.

Here, with reference to FIG. 2, the position of the boundary between the rear end of the head portion 14 and the tip of the neck portion 15 and the position of the boundary between the rear end of the neck portion 15 and the tip of the handle portion 16 are defined. In the present invention, a portion where the width in the Y direction is the same as the maximum width of the head portion 14 or smaller than the maximum width of the head portion 14 between the flocked surface 21-1b and the handle portion 16 is included in the neck portion.

In the present embodiment, in the X direction from the front end of the head portion 14 toward the rear end of the handle portion 16, the width in the Y direction becomes narrower, the amount of change in the width increases, and the change in the width in the Y direction eventually. The position where the amount is almost eliminated is defined as the boundary position between the rear end of the head portion 14 and the tip of the neck portion 15. Further, in the X direction from the front end of the neck portion 15 toward the rear end of the handle portion 16, the width in the Y direction becomes wider, the amount of change in the width increases, and eventually the amount of change in the width in the Y direction almost disappears. Is the position of the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16. In the present invention, the position of the rear end side of the handle portion 16 of the flock hole disposed at the position farthest from the front end of the head portion 14 in the X direction from the front end of the head portion 14 is defined as the rear end of the head portion 14. It is good also as a position of a boundary with the tip of neck part 15. The length of the neck portion 15 in the X direction can be appropriately set within a range of, for example, 20 to 60 mm. In this case, the total length of the head portion and the neck portion is, for example, 40 It can be appropriately set within a range of ˜85 mm.

The neck portion 15 is a portion that connects the head portion 14 and the handle portion 16. The width of the neck portion 15 in the Y direction is configured to be narrower than the width of the head portion 14 and the handle portion 16. The thickness of the neck portion 15 in the Z direction can be the same as the thickness of the head portion 14, for example.

The neck portion 15 includes a core portion 25 that is a component of the hard member 17 and a soft portion 26. The core portion 25 extends in the X direction (extending direction of the neck portion 15), and extends through the neck portion 15, and extends in the X direction. One end of the core portion 25 is the first portion. 25-1 and a second portion 25-2 disposed in a part of the handle portion 16 and integrated with the 25-1. Here, the first portion 25-1 constituting the neck portion 15 will be described, and the second portion 25-2 will be described when the configuration of the handle portion 16 is described.

FIG. 8 is a cross-sectional view of the hard member (specifically, the first portion) shown in FIG. 4 in the BB line direction. Referring to FIGS. 1 to 6 and 8, the first portion 25-1 has one end integrally formed with the rear end of the base member 21, and the other end is the second portion 25-2. It is configured integrally with. The first portion 25-1 is made of a hard resin. The first portion 25-1 has a hard resin (bending elastic modulus (JIS K7203)) in the range of 500 to 3000 MPa, which is harder than the first soft resin 22 and the second soft resin 27 constituting the soft portion 26. A certain hard resin).

The first portion 25-1 has the same thickness in the X direction. When a strong external force is applied to the tip of the head part 14, the neck part 15 is bent at the deformed part 15A shown in FIG. 2 (for example, near the center of the neck part 15) (in other words, the tip of the head part 14). The thickness and shape of the first portion 25-1 and the thickness of the soft portion 26 disposed around the first portion 25-1 may be determined so as to release the force applied to the first portion 25-1.

Specifically, the area of the cut surface of the neck portion 15 obtained by cutting the central portion in the X direction of the neck portion 15 with a plane orthogonal to the X direction (the cut surface 25 of the first portion 25-1). -1a area S1 and the area S2 of the cut surface of the soft part 26 is 100%), the area S1 of the cut surface 25-1a of the first portion 25-1 is 5%. The amount may be less than 50%, and preferably 27%, for example.

As the shape of the first portion 25-1 when cut along a plane orthogonal to the X direction, for example, a circular shape, an elliptical shape, a square shape, a rectangular shape, a diamond shape, a star shape, or the like can be used. In consideration of the safety of the user, the corner of the first portion 25-1 is preferably rounded (round shape).

By the way, when brushing teeth using the toothbrush 10, the neck portion 15 is in the Z direction (in other words, the direction in which a force is applied when pressing the tip of the brush portion 12 between the teeth or between teeth). It is preferable that the material is not easily deformed (in other words, the tip of the brush portion 12 can be firmly pressed against teeth or between teeth).

Therefore, the first width W1 of the first portion 25-1 in the Z direction (first direction orthogonal to the flocked surface 21-1b) is in the Y direction (second direction) orthogonal to the Z direction. It may be larger than the second width W2 of the first portion. The first width W1 is, for example, 1.5 mm to 3.0 mm, and the second width W2 is, for example, 1.5 mm to 2.0 mm.

Thus, the cleaning performance of the toothbrush 10 is reduced by making the first width W1 of the first portion 25-1 in the Z direction larger than the second width W2 of the first portion in the Y direction. Accordingly, when a strong external force or a weak external force is applied to the tip of the head portion 14, the deformation portion 15A can be bent in the Y direction. Thereby, since it becomes possible to escape the force added to the front-end | tip of the head part 14, it can suppress that the oral cavity of the user of the toothbrush 10 is damaged.

In particular, when the user of the toothbrush 10 is an infant of 1 to 3 years old, the toothbrush 10 may be run with the mouth held in the mouth. It is possible to prevent the oral cavity from being damaged.

As a cross-sectional shape of the first portion 25-1, the first width W1 of the first portion 25-1 in the Z direction is larger than the second width W2 of the first portion in the Y direction. An ellipse, a rectangle, a rhombus, etc. as shown in FIG. In this case, the ellipse includes an ellipse in which two semicircles having the same radius are connected by two parallel tangents in addition to a curve formed from a set of points having a constant sum of distances from two focal points. . When the first portion 25-1 having an elliptical or rhombic cross-sectional shape is used, the maximum value of the first width W1 may be configured to be larger than the maximum value of the second width W2. Further, in FIG. 8, when the diameter R1 of the neck portion 15 is 3.95 mm, the first width W1 can be set to 1.975 mm, for example. At this time, the second width W2 can be set to 1.7 mm, for example.

The soft portion 26 is composed of a second soft resin 27 that houses the first portion 25-1 and is softer than the hard resin that constitutes the core portion 25. The soft portion 26 is a member that prevents the first portion 25-1 from being exposed, and the deformed portion 15A of the neck portion 15 is bent when a strong force is applied to the tip of the head portion 14. It is a member for doing. As the second soft resin 27, for example, a soft resin having a hardness of 90 or less according to JIS K 6253 Shore A can be used. As such a soft resin, the soft resin exemplified when explaining the first soft resin 22 can be used.

The second soft resin 27 may be made of a different kind of soft resin from the first soft resin 22 depending on the purpose. In this case, for example, the hardness of the soft resin used as the first soft resin 22 may be higher than the hardness of the soft resin used for the second soft resin 27. By setting it as such a structure, the hardness of the front-end | tip of the head part 14 and the hardness of the neck part 15 can be varied. Further, the same kind of soft resin may be used as the first and second

soft resins

22 and 27. Thereby, the number of types of soft resin used when manufacturing the toothbrush 10 can be reduced.

In FIG. 8, as an example, the case where the outer shape of the cut surface of the soft portion 26 is circular has been described as an example, but the outer shape of the cut surface of the soft portion 26 is not limited thereto. For example, when the first portion 25-1 having an elliptical cut surface 25-1a shown in FIG. 8 is used, as the outer shape of the cut surface of the soft portion 26, for example, a part of the long axis is the cut surface 25- An elliptical shape coinciding with the major axis of 1a or the above-described oval shape may be used. When the cut surface 25-1a is elliptical, oval, or polygonal, the diameter R1 of the neck portion 15 may be set to a value corresponding to the circumscribed circle of the cut surface 25-1a.

With reference to FIGS. 1 to 6, the handle portion 16 includes a second portion 25-2 (a part of the core portion 25) constituting the core portion 25, and a plurality of projecting portions 29 constituting the hard member 17. The handle portion main body 31, the ring-shaped depressions 32-1, 32-2 (ring-shaped depressions), the first rib 34, the second rib 35, and the third rib 37 Have.

FIG. 9 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the CC line direction. 10 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the DD line direction. 1 to 6, 9, and 10, the second portion 25-2 is made of a hard resin, and one end thereof is integrated with the first portion 25-1. . As the hard resin constituting the second portion 25-2, for example, the same hard resin as that constituting the first portion 25-1 can be used.

The second portion 25-2 is similar to the X-direction in which the cross-sectional shape perpendicular to the X direction is continuously expanded from one end of the second portion 25-2 toward the plurality of columnar protrusions 29. It is configured as a shape. That is, the second portion 25-2 is configured such that the diameter of the portion provided with the plurality of protrusions 29 is the largest. Further, the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of projecting portions 29 increases from the plurality of projecting portions 29 toward the rear end side of the handle portion 16. The cross-sectional shape orthogonal to the X direction is a similar shape whose diameter continuously decreases.

As described above, the shape of the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of protrusion portions 29 is changed from the plurality of protrusion portions 29 to the rear end side of the handle portion 16. For example, in the case where the same soft resin is used as the first and second

soft resins

22 and 27, as shown in FIG. When the soft resin is introduced into the second mold 51 from the rear end side of the second mold 51 after the hard member 17 is disposed therein, the direction toward the front end of the head portion 14 (X direction) Since the soft resin easily moves (flows), the entire hard member 17 (except the flocked surface 21-1b and the plurality of flocked holes 21-1B) can be accurately wrapped with the soft resin. Further, as described later, when the soft resin is introduced into the second mold 51, the position and posture of the hard member 17 in the second mold 51 are changed by the introduced soft resin. Can be suppressed.

In the case of the present embodiment, four protrusions 29 are provided as an example. The four protruding portions 29 are arranged in the circumferential direction of the thickest portion of the second portion 25-2. An angle formed by two projecting portions 29 arranged at adjacent positions can be set to 90 degrees, for example. A space formed between two projecting portions 29 arranged at adjacent positions functions as a path for introducing a soft resin into a second mold 51 shown in FIG. 12 described later. The soft resin is supplied to the distal end side of the head portion 21 through the space and is hardened (cured) to become the first soft resin 22.

The plurality of projecting portions 29 each have a projecting surface 29a. The projecting surfaces 29a of the plurality of projecting portions 29 are exposed from the outer surface of the handle portion main body 31 (in other words, the outer surface of the handle portion 16) and face the outer surface of the handle portion main body 31 (the outer surface of the handle portion 16). It is comprised so that it may become one. As shown in FIG. 1, FIG. 2 and FIG. 10, the protruding portion 29 as the first protruding portion located on the + Z side is located on the flocked surface 21-1b side through the opening 31a of the handle portion 31 (soft portion 26). Exposed to. The protruding portion 29 as the second protruding portion located on the −Z side is exposed to the side opposite to the flocked surface 21-1b through the opening 31b of the handle portion 31 (soft portion 26). The protruding portion 29 located on the + Y side is exposed to the + Y side via the opening 31c of the handle portion 31 (soft portion 26). The protruding portion 29 located on the −Y side is exposed to the −Y side through the opening 31c of the handle portion 16 (soft portion 26). As shown in FIGS. 1 and 2, the soft portion 26 in the handle portion 16 has a tapered portion 31A that tapers toward the distal end side, and the openings 31a to 31d are formed in the tapered portion 31A. Yes. In other words, the protruding portion 29 is exposed to the outside through the openings 31a to 31d formed in the tapered portion 31A of the handle portion 16.

As shown in FIG. 10, since the cross-sectional shape of the outer surface of the handle portion 16 is substantially circular, the cross-sectional shape of the protruding surface 29a is an arc shape. Accordingly, each projecting surface 29a is exposed to the outside in the radial direction and exposed to the length direction of the toothbrush 10 and the direction orthogonal to the radial direction. Specifically, for example, in FIG. 10, the protruding surface 29a of the protruding portion 29 as the first protruding portion located on the + Z side is exposed facing the + Z side and exposed facing the + Y side and the −Y side. To do. Similarly, for example, in FIG. 10, the projecting surface 29a of the projecting portion 29 as the second projecting portion located on the −Z side is exposed facing the −Z side, and exposed facing the + Y side and the −Y side. To do.

The plurality of projecting portions 29 are formed by using the second mold 51 (see FIG. 12) to dispose the hard member 17 in the space 53 of the second mold 51 and molding the handle body 31. The protruding surface 29a comes into contact with the inner surface of the second mold 51, thereby having the function of maintaining the posture of the hard member 17 in the space together with the two support portions 21-12 constituting the base member 21 (details are given below) Will be described later). In a state where the hard member 17 is accommodated in the second mold 51, the four projecting portions 29 have the projecting surfaces 29 a in contact with the inner surface of the second mold 51, so that the hard member 17 is viewed from four directions. Support the rear end.

The amount of protrusion of the plurality of protrusions 29 is equal to the thickness of the second soft resin 27 disposed around the plurality of protrusions 29. Therefore, the protrusion amounts of the plurality of protrusions 29 are flush with the surface of the second soft resin 27 according to the desired thickness of the second soft resin 27 disposed around the plurality of protrusions 29. The value can be set as appropriate. In FIG. 10, when the diameter R2 of the second portion 25-2 is 5.6 mm, the protruding amount T1 of the plurality of protruding portions 29 can be set to 1.77 mm, for example.

1 to 6 and FIG. 10, as an example of the plurality of protrusions 29, the case of having four protrusions 29 has been described as an example. However, the number of the plurality of protrusions 29 is four. It is not limited to. For example, the number of the plurality of protrusions 29 may be, for example, three (in this case, the angle formed by the protrusions 29 arranged at adjacent positions is 120 degrees), or two or more 8 No more than two. Further, the shape of the plurality of protrusions 29 may be a shape having a flow path that allows the soft resin to flow from the rear end side of the plurality of protrusions 29 to the front end side of the base member 21. FIG. The shape of the protrusion 29 shown in FIGS. 6 and 10 is not limited to a cylindrical shape. The cross-sectional shape of the plurality of columnar protrusions 29 may be, for example, a star shape or a heart shape excellent in design.

Referring to FIGS. 1 to 3, the handle portion main body 31 is a portion that the user of the toothbrush 10 grasps by hand, and is composed of the second soft resin 27. In this way, by configuring the handle portion main body 31 with the second soft resin 27, a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the toothbrush 10 held in the mouth. When this is done, the handle portion body 31 can be deformed (specifically, bent). As a result, not only the neck portion 15 but also the handle portion main body 31 is bent, so that it is possible to release an external force from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction. Damage to the oral cavity of 10 users can be suppressed.

Further, by configuring the handle portion body 31 using the second soft resin 27, even when a strong force is applied to the handle portion body 31, the handle portion 16 is broken (in other words, the handle portion 16 Can be suppressed).

The ring-shaped depressions 32-1 and 32-2 are provided in an annular shape over the entire circumferential direction of the handle body 31. The ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16 with respect to the arrangement position of the second portion 25-2. The ring-shaped depression 32-1 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-1 has a cross-sectional shape perpendicular to the X direction similar to that of the handle portion main body 31 and a shape in which the diameter continuously decreases. The ring-shaped depression 32-2 is disposed, for example, 20 mm to 50 mm away from the position where the ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16. The ring-shaped hollow portion 32-2 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-2 has a cross-sectional shape perpendicular to the X direction that is similar to that of the handle main body 31, and has a diameter that continuously decreases.

In this way, by disposing the ring-shaped depressions 32-1 and 32-2 configured by reducing the diameter of the handle portion main body 31 in the X direction of the handle portion main body 31, the toothbrush 10 is placed in the mouth. When a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 in the state of being held, the ring-shaped depressions 32-1 and 32-2 as the second deformation portions are disposed at the positions where they are disposed. The handle portion 16 can be easily bent. As a result, the external force applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 can be more efficiently released in a direction different from this, so that the oral cavity of the user of the toothbrush 10 is damaged. Can be further suppressed.

In addition, the user can use the toothbrush 10 by disposing the ring-shaped depressions 32-1 and 32-2 formed by reducing the diameter of the handle body 31 in the X direction of the handle body 31. When it does, since it becomes easy to have the handle | steering-wheel part 16, the operativity of the toothbrush 10 can be improved.

1 to 3, the case where two ring-shaped depressions 32-1 and 32-2 are provided in the handle body 31 has been described as an example, but the ring-shaped depressions 32-1 and 32- The number of 2 is not limited to two. One or more ring-shaped depressions 32-1 and 32-2 may be provided on the handle body 31 as needed. In addition, the disposition positions of the ring-shaped depressions 32-1 and 32-2 may be disposed on the handle portion main body 31 located behind the disposition position of the second portion 25-2. 3 is not limited to the arrangement position of the ring-shaped depressions 32-1 and 32-2.

A plurality of the first rib portions 34 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-1. A plurality of the second rib portions 35 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-2. A plurality of third rib portions 37 are arranged on the side surface (in other words, two side surfaces) of the handle portion main body 31 located on the rear end side with respect to the arrangement position of the second rib portion 35. The first to

third rib portions

34, 35, and 37 can be composed of the second soft resin 27. In this case, the first to

third rib portions

34, 35, and 37 can be collectively formed when the handle portion main body 31 is formed. The first to

third rib portions

34, 35, and 37 are not necessarily required.

As described above, the plurality of first ribs 34 disposed in the ring-shaped depression 32-1, the plurality of ring-shaped depressions 32-2 disposed in the ring-shaped depression 32-2, and the second rib section. Since the fingers holding the toothbrush 10 are difficult to slip by having the plurality of third rib portions 37 disposed on the side surface of the handle portion main body 31 located on the rear end side of the arrangement position of the handle portion 35, the handle portion The grip performance of the main body 31 can be improved.

Referring to FIG. 1, the brush portion 12 is composed of a hair bundle 12-1 planted in a plurality of hair-planting holes 21-1B provided in the base member 21. The hair bundle 12-1 is a bundle of a plurality of hairs. The length (hair length) of the hair bundle 12-1 with respect to the flocked surface 21-1b can be determined in consideration of the waist and the like required for the hair bundle 12-1. Specifically, the length (hair length) of the hair bundle 12-1 can be appropriately set within a range of 6 to 13 mm, for example.

The hair bundle 12-1 may be composed of, for example, a plurality of hairs having the same length, or a plurality of hairs having different hair lengths. In FIG. 1, as an example of the brush portion 12 constituting the toothbrush 10, a case where the tips of the plurality of hair bundles 12-1 constituting the brush portion 12 are aligned is illustrated as an example, but the present invention is not limited thereto. For example, the brush portion 12 may be provided with a step by making the lengths of the plurality of hair bundles 12-1 constituting the brush portion 12 different.

According to the toothbrush of the present embodiment, at least the tip portion is made of the first soft resin 22, the head portion 14 having the flocked surface 21-1b, and the handle portion main body 31 made of the second soft resin 27. And a neck portion 15 that connects the head portion 14 and the handle portion 16, the neck portion 15 extends in the extending direction (X direction) of the neck portion 15, and A core portion 25 made of a hard resin harder than one soft resin 22, and a soft portion 26 made of a second soft resin 27 that houses the core portion 25 and is softer than the hard resin. Including the second soft resin 27 as a component when a strong external force is applied in a direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the user holding the toothbrush 10 in the mouth. Neck 15 and handle Deformation of 16 (specifically, bending) makes it possible to release the force transmitted to the tip of the head portion 14, and the soft first soft resin 22 disposed at the tip of the head portion 14. Since it becomes possible to make it contact with a user's oral cavity, it can suppress that the user's oral cavity of the toothbrush 10 is damaged.

In the present embodiment, the case where the hard member 17 having the base member 21, the core portion 25, and the plurality of protruding portions 29 is used as a constituent element of the toothbrush 10 has been described as an example. A toothbrush (hereinafter referred to as “toothbrush Q” for convenience of description) may be configured using a hard member (hereinafter referred to as “hard member P” for convenience of description) in which 21 is excluded from the constituent elements. The same effect as the toothbrush 10 of this Embodiment can be acquired.

In this case, the hard member P may be configured not only to have a plurality of protrusions 29 only on the rear end side of the core portion 25 but also to have a plurality of protrusion portions 29 on the front end side of the core portion 25. By adopting such a configuration, when a soft resin (resin that becomes the first and second soft resins 22 and 27) is introduced into a mold (not shown) having a space corresponding to the outer shape of the toothbrush Q. In addition, since the posture (position) of the hard member P in the mold can be maintained, the toothbrush Q can be manufactured with high accuracy. Further, when the toothbrush Q is manufactured (specifically, when a hair bundle is implanted), an in-mold method may be used.

FIG. 11 is a cross-sectional view showing a manufacturing process of the toothbrush of the present embodiment, and is a diagram for explaining a process of forming a hard member using a first mold. FIG. 12 is a cross-sectional view illustrating a manufacturing process of the toothbrush of the present embodiment, and illustrates a process of forming the first soft resin, the soft part, and the handle part main body using the second mold. FIG. Moreover, the arrow shown in FIG. 11 has shown the direction in which hard resin is introduced, and the arrow shown in FIG. 12 has shown the direction in which soft resin (soft resin N mentioned later) is introduced.

Next, a method for manufacturing the toothbrush 10 of the present embodiment will be described mainly with reference to FIGS. 1, 11, and 12. Here, the following explanation is given by taking as an example the case where the same kind of soft resin (hereinafter referred to as “soft resin N” for convenience of explanation) is used as the first and second

soft resins

22 and 27. Do.

First, in the process shown in FIG. 11, a space 43 corresponding to the shape of the hard member 17 and an introduction for introducing a hard resin into the space 43 are formed by a pair of molds 41-1 and 41-2. A first mold 41 having a mouth 45 is prepared. The mold 41-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. Further, the introduction port 45 is disposed on the rear end side of the space 43.

Next, the space 43 is filled with a molten hard resin (a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa) serving as a base material of the hard member 17 through the introduction port 45. By hardening the resin, the hard member 17 is formed in which the base member 21 including the plurality of flock holes 21-1B and the support portion 21-2, the core portion 25, and the plurality of protrusions 29 are integrated. Thereafter, the hard member 17 is taken out from the first mold 41.

Next, in the process shown in FIG. 12, a space 53 corresponding to the shape of the toothbrush 10 excluding the brush portion 12 shown in FIG. A second mold 55 having an introduction port 55 for introducing is prepared. The joint surfaces of the pair of molds 51-1 and 51-2 are set at an intermediate position in the Z direction of the soft portion 26 (handle portion main body 31) shown in FIGS. 8 to 10, for example. The mold 51-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. The introduction port 55 is disposed on the rear end side of the space 53. In addition, the second mold 51 is formed with the ring-shaped depressions 32-1 and 32-2, the first rib 34, the second rib 35, and the third rib 37 shown in FIG. Protrusions are provided for doing so.

Next, the hard member 17 is disposed at the tip of the space 53 of the second mold 51. At this time, the inner surface of the mold 51-2 and the flocked surface 21-1b are brought into contact with each other so that the plurality of flocked holes 21-1B are covered, and the end surfaces of the two support portions 21-2 and the mold 51-1. Further, the plurality of (in the case of this embodiment, four) projecting surfaces 29a of the projecting portions 29 and the inner surface of the second mold 51 are brought into contact with each other.

Thereby, in the space 53 of the 2nd metal mold | die 51, the soft resin N used as the 1st soft resin 22 and the 2nd soft resin 27 (the soft resin which comprises the soft part 26 and the handle | steering-wheel main body 31) is carried out. When introduced, the position and posture of the hard member 17 in the second mold 51 can be maintained.

That is, the protruding surface 29a of the protruding portion 29 located on the + Z side contacts the inner surface of the mold 51-2, and the protruding surface 29a of the protruding portion 29 positioned on the −Z side contacts the inner surface of the mold 51-1. Thus, the hard member 17 is positioned in the Z direction. Further, since both the protruding portion 29 positioned on the + Z side and the protruding surface 29a of the protruding portion 29 positioned on the −Z side face the + Y side and the −Y side, the mold 51-1 and the mold 51 -2 is also positioned in the Y direction by contacting the inner surface. Further, the end surfaces of the two supporting portions 21-2 and the protruding surfaces 29 a of the plurality of protruding portions 29 come into contact with the inner surface of the second mold 51, so that the space between the hard member 17 and the second mold 51 is reduced. In addition, a gap for forming the first soft resin 22 and the soft portion 26 can be secured.

Next, the melted soft resin N (JIS K 7215, resin with a Shore A hardness of 90 or less) is filled into the space 53 through the introduction port 55. Since the inner surfaces of the mold 51-1 and the mold 51-2 at the position corresponding to the tapered portion 31A are shortened so as to taper toward the front end side, the projecting surface 29a is in contact with the inner surface. Thus, the hard member 17 is prevented from moving toward the tip side. Therefore, the hard member 17 is positioned without moving in the X direction even when the resin pressure of the molten soft resin N filled through the introduction port 55 is applied. Thereafter, the first soft resin 22, the soft portion 26, and the handle portion main body 31 are formed by curing the soft resin N. Parting lines of minute protrusions are formed on the surface of the soft portion 26 at a position facing the joint surfaces of the mold 51-1 and the mold 51-2 (substantially intermediate position in the Z direction). As a result, the handle body 11 having the head portion 14, the neck portion 15, and the handle portion 16 is formed. Thereafter, the handle body 11 is taken out from the second mold 51.

Next, as shown in FIG. 1, the hair bundle 12-1 is implanted into the plurality of flock holes 21-2 of the head portion 11. Thereby, the toothbrush 10 of this embodiment shown in FIG. 1 is manufactured. For example, after the hair bundle 12-1 is folded in half, a flat wire (a thin plate made of metal (for example, brass)) is inserted inside the hair bundle 12-1. The flat wire flocking method of planting the hair bundle 12-1 with the flat wire sandwiched in the flock hole 21-2 can be used.

(Load application test for toothbrush 10)
A test was performed in which a load in the direction perpendicular to the axis was applied to the tip of the head portion 14. FIG. 13 and FIG. 14 are diagrams for explaining a load test on the toothbrush 10. FIG. 13 is a view in which the rear end portion of the handle portion 16 is fixed to the fixing portion 101 in the autograph tester (maximum detection value 5000 N) so that the toothbrush 10 is substantially along the vertical direction. As shown in FIG. 14, a compressive load in the axial direction was applied downward to the tip of the head portion 14 at a speed of 1000 mm / min (maximum speed of the testing machine) by the presser 102 of the testing machine. . By applying a load in the direction perpendicular to the axis, the toothbrush 10 is deformed with the deformed portion 15 near the center of the neck portion 15 so that the head portion 14 bends in the θZ direction (rotational direction around the Z axis). In addition to the deformation in the deforming portion 15A, the ring-shaped depression 32-2 was deformed as the deforming portion 32-2A by applying a load in the axial direction. Due to the deformation in the deforming portion 32-2A, the tip end side of the ring-shaped depression portion 32-2 is bent in the θZ direction and the side opposite to the bending direction of the head portion 14.

FIG. 15 shows the toothbrush 10 having the above-described configuration in which the resin composition ratio (hard resin: soft resin) of the hard resin to the soft resin is 3%: 97% as Example 1, and only the hard resin (hard resin: soft) A toothbrush for adults formed with resin = 100%: 0%) is set as Comparative Example 1, and a short-axis toothbrush for children formed only with hard resin (hard resin: soft resin = 100%: 0%) It is a figure which shows the result of having implemented the load provision test 3 times (n = 3) as the comparative example 2, respectively. The test results are obtained by measuring the maximum compressive force immediately before the compressive load is reduced with the deformation in the deformed portion.

As shown in FIG. 15, in Comparative Example 1, the average value of the maximum compressive force is 340.2 ± 6.5 N, and the maximum value of the maximum compressive force is 348.8 N, and in Comparative Example 2, the average value of the maximum compressive force. Was 319.1 ± 2.9 N, and the maximum value of the maximum compression force was 322.9 N. On the other hand, in Example 1, it was confirmed that the average value of the maximum compressive force was 13.2 ± 0.7N, the maximum value of the maximum compressive force was 14.2N, and the deformation was caused by a load of 30N or less.

Further, the toothbrush 10 of the present embodiment can be used although it is slightly difficult when the compressive load in the axial direction is about 10N. From this, it was confirmed that the compressive load in the axial direction was deformed at about 5N or more from the viewpoint of usability as a toothbrush, and it was confirmed that the usability was difficult when deformed with a compressive load of less than 5N.

(3-point bending test for toothbrush 10)
Next, a three-point bending test performed on the toothbrush 10 will be described. In FIG. 16, the center position in the X direction of the flocked surface 21-1b in the head portion 14 is supported by the support element 111 from the −Z side, and the end on the distal end side of the handle portion 16 is supported by the support element 112 from the −Z side. In the state, a load is applied to the central portion of the neck portion 15 in the thickness direction from the + Z side to the −Z side by the presser 113. In FIG. 17, the center position in the X direction of the flocked surface 21-1b in the head portion 14 is supported by the support element 111 from the −Y side, and the end on the distal end side of the handle portion 16 is supported by the support element 112 from the −Y side. In this state, a load is applied to the central portion of the neck portion 15 in the width direction from the + Y side to the −Y side by the presser 113.

In the above three-point bending test, the presser 113 is moved at a speed of 10 mm / min to apply a load to the neck portion 15, and the maximum load when the neck portion 15 is deformed 5 mm using the deformed portion 15 </ b> A is the deformation strength. It was measured as (bending strength). FIG. 18 is a diagram illustrating a result of performing a three-point bending test three times (n = 3) on the toothbrush 10 having the above-described configuration. As shown in FIG. 18, the deformation strength in the thickness direction (Z direction) was larger than the deformation strength in the width direction (Y direction).

Also, assuming that the bending strength in the thickness direction (Z direction) at the deformed portion 15A is S1, and the bending strength in the width direction (Y direction) at the deformed portion 15A is S2, both the measurement results and the average values of the measurement results are obtained. It was confirmed that the relationship of S1 / S2> 1.5 was satisfied.

As described above, the toothbrush 10 according to the present embodiment has the deformed portions 15A and 32-2A that are deformed when the axial load on the head portion 14 is 30 N or less, so that the load is applied to the head portion 14 in the oral cavity. Even when added, for example, the deformable portion 15A can be easily deformed. Therefore, in this embodiment, even if a load is applied to the head part 14 in a state where the user holds the toothbrush 10 in the mouth, damage in the user's oral cavity can be suppressed. Further, in the present embodiment, since a plurality of deformation portions 15 in the neck portion 15 and a plurality of deformation portions 32-2A and deformation portions in the handle portion 16 are provided, the position where the user holds the toothbrush 10, the size of the hand, etc. Even if the position where the load is applied or the magnitude of the load fluctuates accordingly, it is easy to ensure the deformation in the deformed portion. Further, since each of the plurality of deforming portions is deformed, the load borne by each deforming portion is apportioned and reduced, so that safety can be further improved.

Furthermore, the toothbrush 10 according to the present embodiment applies a force when the bending strength of the deformed portion 15A in the neck portion 15 is greater in the thickness direction than in the width direction, that is, when the tip of the brush portion 12 is pressed against teeth or between teeth. Since the direction to be pressed is larger, it is possible to firmly press the tip of the brush portion 12 against the teeth or between the teeth.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

For example, in the above embodiment, the configuration in which the soft portion 26 is provided at the distal end portion of the head portion 14 is exemplified, but the present invention is not limited to this, and as shown in the side view of FIG. 19 and the front view of FIG. A configuration in which the deformable portion 15A in the neck portion 15 is included and the soft portion 26 is provided on the rear end side from the deformable portion 15A may be employed.
Further, as the toothbrush, the present invention can be widely applied to a so-called one-tuft toothbrush having a single hair bundle, a toothbrush having a tongue coating auxiliary removing portion, and the like.

In the above embodiment, the width in the second direction (Y direction) is smaller than the width of the head portion 14 (maximum width in the Y direction) between the flocked surface 21-1b and the handle portion 16. Although the toothbrush 10 in which the neck portion 15 is disposed has been described, the present invention is not limited to this configuration. For example, the width in the Y direction between the flocked surface 21-1b and the handle portion 16 is A toothbrush in the case where the same portion as the maximum width exists is also included in the present invention. In this case, the deformed portion is disposed as the neck portion, and at least a part of the hard member is accommodated in the rear end side from the deformed portion, and the soft portion formed of the soft resin is disposed. Is done.

In the above-described embodiment, as an example, the configuration in which one deformed portion is arranged in each of the neck portion 15 and the handle portion 16 has been shown. However, as described above, if the load in the axial direction is deformed at 30 N or less, The position and the number of deformation parts are not particularly limited. Moreover, in the said embodiment, although the structure provided with the hard member 17 was illustrated, it is not limited to this structure. If the load in the direction perpendicular to the axis is deformed at 30 N or less, for example, the handle body 11 may be formed of only a soft resin.

Further, when a plurality of deformation portions are provided, a configuration in which the deformation directions are different from each other is also preferable. For a plurality of deformed parts, when the deformation direction with a large bending strength is the same, a load is applied in the deformation direction with a large bending strength, and the deformed part may fall into a situation where it is difficult to deform, By making the deformation directions different from each other for the plurality of deformation portions, it is possible to suppress such a situation.

[Second Embodiment]
Hereinafter, a second embodiment of the toothbrush of the present invention will be described with reference to FIGS. In these drawings, the same reference numerals are given to the same components as those of the first embodiment shown in FIGS. 1 to 20, and the description thereof is omitted or simplified.

FIG. 21 is a side view of the toothbrush according to the embodiment of the present invention. FIG. 22 is a front view of the toothbrush shown in FIG. In FIG. 22, for convenience of explanation, the illustration of the brush unit 12 including the plurality of hair bundles 12-1 shown in FIG. 21 is omitted. FIG. 23 is a rear view of the toothbrush shown in FIG.
FIG. 24 is an enlarged side view of the hard member shown in FIG. 25 is an enlarged front view of the hard member shown in FIG. FIG. 26 is an enlarged rear view of the hard member shown in FIG.

21 to 26 indicate the extending direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used. The Z direction shown in FIGS. 21 and 24 indicates a first direction (normal direction) orthogonal to the flocked surface 21-1b when the toothbrush 10 is not used. 22, 23, 25, and 26 indicate the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction). 24 to 26, the reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also shown for convenience of explanation.

The neck portion 15 includes a core portion 25 that is a component of the hard member 17 and a soft portion 26. The core portion 25 extends in the X direction (extending direction of the neck portion 15), and extends through the neck portion 15, and extends in the X direction. One end of the core portion 25 is the first portion. 25-1 and a second portion 25-2 disposed over the rear end side of the handle portion 16.

The handle portion 16 includes a second portion 25-2 (a part of the core portion 25) constituting the core portion 25, a plurality of projecting portions 29 constituting the hard member 17, a handle portion main body 31, and a ring-shaped depression. There are portions 32-1 and 32-2 (ring-shaped depressions), a first rib portion 34, a second rib portion 35, and a third rib portion 37.

The second portion 25-2 is formed with a constant diameter on the rear end side from a position 25P at a predetermined distance (for example, 5 to 10 mm) from the plurality of columnar protrusions 29 to the rear end side in the X direction. Yes. The position of the end portion on the rear end side of the second portion 25-2 is, for example, about 5 mm away from the end portion on the rear end side of the handle portion 16. The second portion 25-2 on the rear end side from the position 25P does not necessarily have a constant diameter. For example, in the X direction in which the ring-shaped depressions 32-1 and 32-2 are formed, It is good also as a structure by which the location where a diameter is small is provided in a position. Even in this configuration, it is possible to maintain ease of bending and high grip.

The second portion 25-2 has a similar shape in which the cross-sectional shape orthogonal to the X direction is continuously expanded from the position toward the plurality of columnar protrusions 29 toward the tip end side. It is said that. That is, the second portion 25-2 is configured such that the diameter of the portion provided with the plurality of protrusions 29 is the largest. Further, in the second portion 25-2, the portion disposed between the plurality of protrusions 29 and the position 25P has a cross-sectional shape orthogonal to the X direction from the plurality of protrusions 29 toward the position 25P. It is a similar shape with a continuously decreasing diameter.

As described above, in the second portion 25-2, the shape up to the position 25P disposed on the rear end side of the handle portion 16 with respect to the plurality of projecting portions 29 has a diameter that decreases toward the rear end side. Thus, for example, when the same soft resin is used as the first and second

soft resins

22 and 27, the hard member 17 is disposed in the second mold 51 as shown in FIG. After that, when the soft resin is introduced into the second mold 51 from the rear end side of the second mold 51, the soft resin moves (flows) in the direction toward the tip of the head portion 14 (X direction). Therefore, the entire hard member 17 (except the flocked surface 21-1b and the plurality of flocked holes 21-1B) can be accurately wrapped with the soft resin. Further, as described later, when the soft resin is introduced into the second mold 51, the position and posture of the hard member 17 in the second mold 51 are changed by the introduced soft resin. Can be suppressed.

The handle portion main body 31 is a portion that the user of the toothbrush 10 grasps by hand, and has a configuration in which the second soft resin 27 accommodates a part of the second portion 25-2 therein. As described above, by constituting a part of the handle portion main body 31 with the second soft resin 27, the handle portion main body 31 is strong in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the toothbrush 10 held in the mouth. When an external force is applied, the handle body 31 can be deformed (specifically, bent). As a result, not only the neck portion 15 but also the handle portion main body 31 is bent, so that it is possible to release an external force from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction. Damage to the oral cavity of 10 users can be suppressed. Further, since a part of the second portion 25-2 made of hard resin is accommodated inside the handle portion main body 31, it is difficult to bend during brushing, and a good grip property can be obtained.

The ring-shaped depressions 32-1 and 32-2 are provided in an annular shape over the entire circumferential direction of the handle body 31. The ring-shaped depression 32-1 is arranged on the rear end side with respect to the boundary position between the neck portion 15 and the handle portion 16. The ring-shaped depression 32-1 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-1 has a cross-sectional shape perpendicular to the X direction similar to that of the handle portion main body 31 and a shape in which the diameter continuously decreases. The ring-shaped depression 32-2 is disposed, for example, 20 mm to 50 mm away from the position where the ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16. The ring-shaped hollow portion 32-2 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-2 has a cross-sectional shape perpendicular to the X direction that is similar to that of the handle main body 31, and has a diameter that continuously decreases.

In FIGS. 21 to 23, the case where the handle portion main body 31 is provided with two ring-shaped depressions 32-1 and 32-2 has been described as an example, but the ring-shaped depressions 32-1 and 32- The number of 2 is not limited to two. One or more ring-shaped depressions 32-1 and 32-2 may be provided on the handle body 31 as needed. Further, the ring-shaped depressions 32-1 and 32-2 may be disposed at the positions where the second portions 25-2 are disposed. The ring-shaped depressions 32 shown in FIGS. -1, 32-2 is not limited to the arrangement position.

According to the toothbrush of the present embodiment, since a part of the second portion 25-2 of the hard member 17 is accommodated up to the rear end side of the handle portion 16, it is difficult to bend at the time of brushing, and a good grip property is obtained. Obtainable.

In this case, the hard member P is configured not only to have the plurality of protrusions 29 only on the center side of the core part 25 but also to have a plurality of protrusions 29 on the front end side and the rear end side of the core part 25. Good. By adopting such a configuration, when a soft resin (resin that becomes the first and second soft resins 22 and 27) is introduced into a mold (not shown) having a space corresponding to the outer shape of the toothbrush Q. In addition, since the posture (position) of the hard member P in the mold can be maintained, the toothbrush Q can be manufactured with high accuracy. Further, when the toothbrush Q is manufactured (specifically, when a hair bundle is implanted), an in-mold method may be used.

FIG. 27 is a cross-sectional view showing a manufacturing process of the toothbrush of the present embodiment, and is a diagram for explaining a process of forming a hard member using a first mold. FIG. 28 is a cross-sectional view illustrating the manufacturing process of the toothbrush of the present embodiment, and illustrates the process of forming the first soft resin, the soft part, and the handle part main body using the second mold. FIG. Moreover, the arrow shown in FIG. 27 has shown the direction into which hard resin is introduced, and the arrow shown in FIG. 28 has shown the direction into which soft resin (soft resin N mentioned later) is introduced.

Next, a method for manufacturing the toothbrush 10 of the present embodiment will be described mainly with reference to FIGS. 21, 27, and 28. FIG. Here, the following explanation is given by taking as an example the case where the same kind of soft resin (hereinafter referred to as “soft resin N” for convenience of explanation) is used as the first and second

soft resins

22 and 27. Do.

First, in the process shown in FIG. 27, a space 43 corresponding to the shape of the hard member 17 and an introduction for introducing a hard resin into the space 43 are formed by a pair of molds 41-1 and 41-2. A first mold 41 having a mouth 45 is prepared. The mold 41-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. Further, the introduction port 45 is disposed on the rear end side of the space 43.

Next, in the step shown in FIG. 28, a pair of molds 51-1 and 51-2, which is melted in the space 53 corresponding to the shape of the toothbrush 10 excluding the brush portion 12 shown in FIG. A second mold 51 having an inlet 55 for introducing a soft resin is prepared.

Next, the hard member 17 is disposed at the tip of the space 53 of the second mold 51.
Next, the melted soft resin N (resin having a hardness of JIS K 7215 Shore A of 90 or less) is filled into the space 53 through the introduction port 55.

Next, as shown in FIG. 21, the hair bundle 12-1 is implanted into the plurality of flock holes 21-2 of the head portion 11. Thereby, the toothbrush 10 of this embodiment shown in FIG. 21 is manufactured.

Thus, in the toothbrush 10 according to the present embodiment, when an external force is applied to the head portion 14, the deformation portion 15 </ b> A in the neck portion 15 is deformed, so that the force applied to the tip of the head portion 14 can be released. Therefore, the toothbrush 10 in this embodiment can suppress that a user's oral cavity is damaged. In particular, the toothbrush 10 according to the present embodiment is an infant's oral cavity even when the infant falls when the user is an infant of 1 to 3 years while running with the toothbrush 10 held in the mouth. Can be prevented from being damaged. Moreover, since the hard member 17 is arrange | positioned over the rear-end side of the handle | steering-wheel part 16 in the toothbrush 10 in this embodiment, the handle | steering-wheel part 16 becomes difficult to bend at the time of brushing, and it can obtain favorable grip property. There is also an effect.

In the toothbrush 10 according to the present embodiment, a force is applied when the bending strength of the deformed portion 15A in the neck portion 15 is greater in the thickness direction than in the width direction, that is, when the tip of the brush portion 12 is pressed against teeth or between teeth. Since the direction in which it is applied is larger, the tip of the brush portion 12 can be firmly pressed against the teeth or between the teeth, and the cleaning effect can be maintained.

For example, in the above-described embodiment, the configuration in which the soft portion 26 is provided at the distal end portion of the head portion 14 is illustrated, but is not limited thereto, as shown in the side view of FIG. 29 and the front view of FIG. A configuration in which the deformable portion 15A in the neck portion 15 is included and the soft portion 26 is provided on the rear end side from the deformable portion 15A may be employed.
Further, as the toothbrush, the present invention can be widely applied to a so-called one-tuft toothbrush having a single hair bundle, a toothbrush having a tongue coating auxiliary removing portion, and the like.

Moreover, in the said embodiment, although the structure which provides the protrusion part 29 in the front end side of the handle part 16 among the hard members 17 was illustrated, it is not restricted to this structure, About the position of the rear end side of the handle part 16 May be configured to be provided with a similar protrusion. As shown in FIG. 28, when the molten soft resin is introduced from the introduction port 55 in the second mold 51, that is, when the molten soft resin is introduced from the rear end side of the handle portion 16, the hard resin is hard. The second portion 25-2 on the rear end side from the position 25P in the member 17 is bent by the introduction pressure of the soft resin, so that the coaxiality between the second portion 25-2 and the handle portion 16 may be lowered. Therefore, when providing a protrusion at the position on the rear end side of the handle portion 16, it is preferable to provide the protrusion at the position of the end portion on the rear end side. As with the protrusion 29, the positions where the protrusions are provided around the X axis are preferably + Z side and −Z side, more preferably a total of four positions on the + Y side and −Y side.

The present invention can be applied to a toothbrush.

DESCRIPTION OF SYMBOLS 10 ... Toothbrush, 11 ... Handle body, 12 ... Brush part, 14 ... Head part, 15 ... Neck part, 15A, 32-2A ... Deformation part, 16 ... Handle part, 17 ... Hard member, 21 ... Base member, 21- DESCRIPTION OF SYMBOLS 1 ... Base member main body, 21-1a ... Bottom surface, 21-1A ... Tip part, 21-1b ... Flocking surface, 21-1B ... Flocking hole, 21-2 ... Supporting part, 21-2a ... Projection surface, 22 ... No. 1 soft resin, 25 ... core portion, 25-1 ... first portion, 25-1a ... cut surface, 25-2 ... first portion, 26 ... soft portion, 27 ... second soft resin, 29 ... Projection part, 29a ... Projection surface, 31 ... Handle part body, 31A ... Tapered part, 32-1, 32-2 ... Ring-shaped depression (second deformation part), 34 ... First rib part, 35 ... Second , 37... Third rib portion, 41... First mold, 41-1, 41-2, 51-1. 51-2: mold, 43, 53 ... space, 45, 55 ... inlet, 51 ... second mold, R1, R2 ... diameter, S1, S2 ... area, T1 ... protrusion amount, W1 ... first Width, W2 ... second width

Claims

A head portion having a flocked surface on the tip side in the direction perpendicular to the axis;
A handle portion that is disposed on the rear end side in the axial direction from the head portion and includes a handle portion main body;
A deforming portion that is deformed by a load in the axial direction with respect to the head portion;
Have
The deforming portion is deformed when the load is 30 N or less.
The toothbrush according to claim 1, wherein the deforming portion is deformed when the load is 5N or more.
A neck portion having a width in a first direction orthogonal to the flocked surface and a second direction orthogonal to the axial direction is not more than the maximum width of the head portion between the flocked surface and the handle portion. The toothbrush according to claim 1 or 2, wherein the toothbrush is made.
The deforming portion is disposed on the neck portion,
When the bending strength in the first direction at the deforming portion is S1, and the bending strength in the second direction at the deforming portion is S2,
S1 / S2> 1.5
The toothbrush according to claim 3, wherein the relationship is satisfied.
The toothbrush according to any one of claims 1 to 4, wherein a plurality of the deforming portions are arranged.
The toothbrush according to claim 5, wherein the plurality of deformation portions have different deformation directions.
The toothbrush according to any one of claims 1 to 6, wherein the deforming portion is disposed at least between the flocked surface and the handle portion.
The toothbrush according to claim 7, wherein the deforming portion is further disposed on the handle portion.
A hard member formed from a hard resin and disposed over a part of the front end side of the handle portion from the head portion;
A soft portion that is disposed on the rear end side from the deformed portion disposed between the flocked surface and the handle portion, accommodates at least a part of the hard member therein, and is formed of a soft resin;
The toothbrush according to claim 7 or 8, comprising:
The toothbrush according to claim 9, wherein at least a tip of the head portion is made of the soft resin.
The hard member between the flocked surface and the handle portion has a second width in a first direction orthogonal to the flocked surface in a second direction orthogonal to the axial direction and the first direction. The toothbrush according to claim 9 or 10, wherein the toothbrush is larger than the width of the toothbrush.
The hard member in the head portion includes a base member having the flocked surface and a plurality of flocked holes,
The said soft resin is arrange | positioned so that a part of said base member may be covered in the state which exposed the said flocked surface and these flocked holes. Toothbrush as described in.
A head portion having a flocked surface on the tip side;
A handle portion disposed on the rear end side from the head portion and including a handle portion body;
Have
A deforming portion that is disposed between the flocked surface and the handle portion, and is deformed by an external force applied to the head portion;
A hard member disposed from the head part to the rear end side of the handle part and formed of a hard resin;
At least a part of the hard member disposed on the rear end side from the deformed portion, and a soft portion formed of a soft resin; and
A toothbrush characterized by including.
The toothbrush according to claim 13, further comprising a second deforming portion disposed on the handle portion and deformed by the external force.
The handle portion has at least one ring-shaped depression having a reduced diameter with respect to the extending direction of the handle portion,
The toothbrush according to claim 14, wherein the second deforming portion is disposed at a position where the hollow portion is disposed.
The toothbrush according to claim 15, wherein the hollow portion is coaxial with the handle portion and has a cross-sectional shape similar to the cross-sectional shape of the handle portion.
The toothbrush according to any one of claims 14 to 16, wherein an end portion on a rear end side of the hard member is located on a rear end side with respect to the second deformable portion.
The toothbrush according to any one of claims 14 to 17, wherein the bending strength of the deformation portion is smaller than the bending strength of the second deformation portion.
The deformation portion has a bending strength in a first direction orthogonal to the flocked surface that is higher than a bending strength in a second direction orthogonal to the length direction of the handle portion and the first direction. The toothbrush according to claim 13, wherein the toothbrush is large.
The hard member between the flocked surface and the handle portion has a first width in the first direction larger than a second width in the second direction. Toothbrush.
The toothbrush according to any one of claims 13 to 20, wherein at least a tip of the head portion is made of the soft resin.
The hard member includes, in the handle portion, a columnar first protrusion that protrudes and is exposed at least toward the flocked surface side, and a columnar second protrusion that protrudes and is exposed to the opposite side of the flocked surface in the handle portion. The toothbrush according to any one of claims 13 to 21, characterized in that
The first protrusion is exposed through a first opening formed on the flocked surface side of the soft part,
The toothbrush according to claim 22, wherein the second protrusion is exposed through a second opening formed on a side opposite to the flocked surface side of the soft part.
The toothbrush according to claim 22 or 23, wherein a front end surface of the first projecting portion and a front end surface of the second projecting portion are flush with an outer surface of the handle portion.
Of the hard member, a part of the portion disposed on the rear end side of the handle portion with respect to the first projecting portion and the second projecting portion has a diameter that decreases toward the rear end side of the handle portion. The toothbrush according to any one of claims 22 to 24, wherein the toothbrush has a shape as follows.
Between the flocked surface and the handle portion, a width in a first direction orthogonal to the flocked surface and a second direction orthogonal to the length direction of the handle portion is equal to or less than the maximum width of the head portion. The toothbrush according to any one of claims 13 to 25, wherein a neck portion is arranged.