KR102577531B1 - Toothbrush - Google Patents

Abstract

The purpose of the present invention is to provide a toothbrush that can prevent damage to the user's oral cavity. It has a head portion 14 having a hair transplantation surface 21-1b on the front end side, and a handle portion 16 disposed on the rear end side of the head portion and including a handle portion main body 31, between the hair transplantation surface and the handle portion. A deformable portion 15A disposed in the head portion and deformed by an external force to the head portion, a hard member 17 disposed from the head portion to a portion of the front end of the handle portion and made of hard resin, and disposed toward the rear end side from the deformable portion and made rigid. At least part of the member is accommodated therein, and it also includes a soft portion 26 formed of soft resin.

Description

Toothbrush {TOOTHBRUSH}

The present invention relates to toothbrushes, particularly to a toothbrush that can prevent damage to the user's oral cavity.

This application claims priority based on Japanese Patent Application No. 2014-177334, filed in Japan on September 1, 2014, and uses the content here.

Conventionally, when using a toothbrush (specifically, when the toothbrush is in the mouth), injuries outside the oral cavity may occur due to tipping, especially when the user of the toothbrush is a child aged 1 to 3 years. There are many cases to wear.

Conventionally, there is a toothbrush disclosed in Patent Document 1 as a toothbrush capable of suppressing damage or bending of the head portion and neck portion.

Patent Document 1 discloses a toothbrush in which a coating layer made of soft resin is formed on the surface of a base made of hard resin, covering 70% or more of the total surface area of the head portion and the neck portion.

In addition, Patent Document 1 states that the overall thickness of the head and neck portion (the total thickness of the thickness of the base and the thickness of the coating layer covering the base) is 3 to 5 mm, and the thickness of the base constituting the head and neck portion is set to 3 to 5 mm. It is disclosed that the thickness of the coating layer is set to 2 to 4 mm and the thickness of the coating layer is set to 0.5 to 2 mm (preferably 0.8 to 1.5 mm).

Patent Document 1 states that by using the above-described configuration, it is possible to make it difficult to bend the handle even when an excessive load is applied to the head or neck, and that the folded portion is prevented from being exposed by the coating layer even when the head or neck is bent. What can be done is disclosed.

In the toothbrush disclosed in Patent Document 1 having the above-described structure, the base constituting the tip of the head is covered with a soft resin, so when the toothbrush is chewed strongly or the tip of the head is strongly touched in the oral cavity, the soft resin functions as a cushioning material.

For this reason, by using the toothbrush disclosed in Patent Document 1, it becomes possible to suppress damage in the oral cavity caused by the tip of the head.

Japanese Patent Publication No. 2013-458

However, the neck portion of the toothbrush disclosed in Patent Document 1 is thinner than the base so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck portion, and also has a coating layer made of soft resin (the preferred thickness is 0.8 to 1.5 mm). mm) is formed.

For this reason, the neck portion of the toothbrush disclosed in Patent Document 1 has a structure in which the ratio of the base made of hard resin is higher than that of soft resin.

For this reason, the head portion of the toothbrush disclosed in Patent Document 1, for example, is positioned at the tip of the head portion to prevent damage to the inside of the user's oral cavity when an external force is applied in the extension direction of the toothbrush (specifically, the direction from the rear end of the toothbrush toward the front end). It was difficult to bend it so that the transmitted external force could sufficiently flow out (however, it was easier to bend than if it were made entirely of hard resin).

Therefore, if a strong external force is applied from the rear end to the front end of the toothbrush while the toothbrush disclosed in Patent Document 1 is held in the mouth, there is a risk that the user's oral cavity may be damaged.

In particular, if the toothbrush user is a child aged 1 to 3 years, the risk of damage to the oral cavity increases.

The present invention was made in consideration of the above problems, and its purpose is to provide a toothbrush that can prevent damage to the user's oral cavity.

In order to solve the above problem, a toothbrush according to an embodiment of the present invention has a head portion having a bristle-flocking surface on the front end side, a handle portion disposed at a rear end side of the head portion and including a handle portion main body, and the bristle-flocking surface and a deformable portion disposed between the handle portions and deformed by an external force to the head portion; a hard member disposed from the head portion to a portion of the front end of the handle portion and made of hard resin; and disposed toward the rear end from the deformable portion. It is characterized in that it accommodates at least a portion of the hard member therein, and also includes a soft portion formed of soft resin.

Additionally, the toothbrush according to one embodiment of the present invention is characterized by having a second deformable portion disposed on the handle portion and deformed by the external force.

In addition, in the toothbrush according to one embodiment of the present invention, the handle portion has at least one ring-shaped depression with a reduced diameter with respect to the direction in which the handle portion extends, and the second deformation portion is disposed at an arrangement position of the depression. It is characterized by

Furthermore, in the toothbrush according to one embodiment of the present invention, the hard member includes a first exposed portion exposed to the hair-planting surface side in the head portion and a second exposed portion exposed to a side opposite to the hair-flocking surface. It is characterized by having.

In addition, in the toothbrush according to one embodiment of the present invention, the hard member has a column-shaped first protrusion that protrudes and exposes toward the hair-planting surface in the handle portion and is different from the hair-planting surface in the handle portion. It is characterized by having a column-shaped second protrusion that protrudes and exposes to the opposite side.

Additionally, in the toothbrush according to one embodiment of the present invention, the first protrusion is exposed through a first opening formed on the hair-planting surface side of the soft part, and the second protrusion is exposed to the hair-planting surface side of the soft part. is characterized in that it is exposed through a second opening formed on the opposite side.

Furthermore, in the toothbrush according to one embodiment of the present invention, the soft portion in the handle portion has a tapered portion that tapers toward the tip, and the first opening and the second opening have the tapered portion. It is characterized by being formed in .

Furthermore, in the toothbrush according to one embodiment of the present invention, the soft portion has a dividing line on the surface, and the first protrusion is exposed to one side in a direction perpendicular to the hair transplantation surface with the dividing line interposed therebetween, The second protrusion is exposed to the other side in the orthogonal direction across the dividing line.

Additionally, in the toothbrush according to the embodiment of the present invention, the hard member is arranged to extend to the handle, and the front end surface of the first protrusion and the front end surface of the second protrusion are on the outer surface of the handle portion. It is characterized by being immune to it.

In addition, in the toothbrush according to the embodiment of the present invention, the portion of the hard member disposed on the rear end side of the handle unit than the first protrusion and the second protrusion has a diameter as it faces the rear end side of the handle unit. It is characterized by a smaller shape.

In addition, in the toothbrush according to one embodiment of the present invention, the head portion is made of a first soft resin that is softer than the hard resin at least at the tip, and the handle body is made of a second soft resin that is softer than the hard resin. The soft part is characterized in that it is composed of the second soft resin.

Furthermore, in the toothbrush according to one embodiment of the present invention, the hard member between the hair-flocking surface and the handle portion has a first width in a first direction orthogonal to the hair-flocking surface of the handle portion. It is characterized in that it is larger than the second width in the longitudinal direction and the second direction perpendicular to the first direction.

Furthermore, in the toothbrush according to one embodiment of the present invention, the hard member in the head portion includes a base member having the hair-flocking surface and a plurality of hair-flocking holes, and the first soft resin is on the hair-flocking surface. and arranged to cover a portion of the base member with the plurality of hair transplant holes exposed.

In addition, in the toothbrush according to one embodiment of the present invention, the width between the hair-flocking surface and the handle portion in the first direction perpendicular to the hair-flocking surface and the second direction orthogonal to the longitudinal direction of the handle portion is the width of the head. It is characterized in that the neck part is arranged less than the width of the part.

(Effects of the Invention)

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

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. 1.
Figure 3 is a rear view of the toothbrush shown in Figure 1.
FIG. 4 is an enlarged side view of the hard member shown in FIG. 1.
FIG. 5 is an enlarged front view of the hard member shown in FIG. 2.
FIG. 6 is an enlarged rear view of the hard member shown in FIG. 3.
FIG. 7 is a cross-sectional view taken along line AA of the hard member shown in FIG. 4.
Fig. 8 is a cross-sectional view taken along line BB of the hard member (specifically, the first portion) shown in Fig. 4.
FIG. 9 is a cross-sectional view taken along line CC of the hard member (specifically, the second portion) shown in FIG. 4.
FIG. 10 is a cross-sectional view taken along line DD of the hard member (specifically, the second portion) shown in FIG. 4.
Fig. 11 is a cross-sectional view showing the manufacturing process of the toothbrush of this embodiment, and is a diagram for explaining the process of forming a hard member using the first mold.
Fig. 12 is a cross-sectional view showing the manufacturing process of the toothbrush of this embodiment, and is a diagram for explaining the process of forming the first soft resin, the soft portion, and the handle portion main body using the second mold.
Figure 13 is a side view showing a modified example of a toothbrush according to an embodiment of the present invention.
Fig. 14 is a front view of the toothbrush shown in Fig. 13.

Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings. In addition, 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 may be different from the dimensional relationship of an actual toothbrush.

(Embodiment)

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. 1. In FIG. 2, for convenience of explanation, illustration of the brush part 12 comprised of the plurality of bristle bundles 12-1 shown in FIG. 1 is omitted. Figure 3 is a rear view of the toothbrush shown in Figure 1.

FIG. 4 is an enlarged side view of the hard member shown in FIG. 1. FIG. 5 is an enlarged front view of the hard member shown in FIG. 2. FIG. 6 is an enlarged rear view of the hard member shown in FIG. 3.

In the structures shown in FIGS. 1 to 6, the same components are given the same reference numerals. The The Y direction shown in FIGS. 2, 3, 5, and 6 represents the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction).

The Z direction shown in FIGS. 1 and 4 represents the first direction orthogonal to the hair transplantation surface 21-1b when the toothbrush 10 is not in use.

4 to 6 also show symbols for components of the toothbrush 10 other than those of the hard member 17 for convenience of explanation.

1 to 6, the toothbrush 10 of this embodiment has a handle body 11 and a brush portion 12.

The handle body 11 constitutes a head portion 14, a neck portion 15, a handle portion 16, and a portion of the head portion 14, the neck portion 15, and the handle portion 16. It has a hard member (17).

In this embodiment, a neck portion 15 whose width in the second direction (Y direction) is smaller than the width of the head portion 14 (maximum width in Y direction) is provided between the hair transplantation surface 21-1b and the handle portion 16. The toothbrush 10 on which is disposed will be described.

The head portion 14 has a base member 21 made of 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 components 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 main body 21-1 has an external shape of the head portion 14 of 1 to 1 to enable placement of the first soft resin 22 on the side and bottom surfaces 21-1a of the base member main body 21-1. It has a shape that has been reduced by about 2 mm. The base member main body 21-1 has a tip portion 21-1A, a bottom surface 21-1a, a tufting surface 21-1b, and a tufting hole 21-1B.

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

FIG. 7 is a cross-sectional view taken along line A-A of the hard member shown in FIG. 4. In Fig. 7, the same components as the structures shown in Figs. 1 to 6 are given the same reference numerals. In addition, in FIG. 7, for convenience of explanation, symbols for components of the toothbrush 10 other than those of the hard member 17 are also shown.

Referring to FIGS. 1, 3, 4, 6, and 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 planting surface (21-1b). It is done. The bottom surface 21-1a can be, for example, a flat surface.

The hair transplantation surface 21-1b is a flat surface. The hair transplantation surface 21-1b exposes a plurality of hair transplantation holes 21-1B. The hair transplantation surface 21-1b is exposed from the first soft resin 22 as the first exposed portion of the head portion 14.

In this way, the base member main body 21-1 is constructed using a hard resin harder than the first soft resin 22, and a plurality of hair transplant holes 21-1B and a hair transplant surface 21-1b are formed. 1 By exposing from the soft resin 22, the bristle bundle 12-1 constituting the brush portion 12 can be transplanted (planted) into the plurality of hair transplant holes 21-1B using a flat wire transplant method.

When the first soft resin 22, the soft portion 26, and the handle portion main body 31 are resin-molded, the hair transplantation surface 21-1b is formed using the second mold 51 shown in FIG. 12, which will be described later. It is a surface in contact with the inner surface of one mold 51-2 (see FIG. 12).

In this way, the tufting surface 21-1b contacts the inner surface of one mold 51-2 constituting the second mold 51, thereby forming a plurality of tufting holes 21-1B and the tufting surface 21-1b. It is possible to suppress the formation of the first soft resin 22.

A plurality of hair transplant holes 21-1B are formed in the base member main body 21-1 on the side constituting the hair transplant surface 21-1b. The bristle bundle 12-1 constituting the brush portion 12 is planted into the hair transplantation hole 21-1B.

As the arrangement of the plurality of tuft holes 21-1B, for example, it is possible to use the arrangement shown in Fig. 2, but it is not limited to this, and any arrangement pattern such as a so-called checkerboard arrangement or a zigzag arrangement may be used.

In addition, the number of the plurality of tuft holes 21-1B is not limited to the number of tuft holes 21-1B shown in FIG. 2, and can be appropriately set within the range of, for example, 10 to 60 holes.

That is, the arrangement of the plurality of tufting holes 21-1B and the number of tufting holes 21-1B can be set appropriately depending on the purpose.

The shape of the hair transplant hole 21-1B is not particularly limited, and for example, a circular shape such as a perfect circle or an ellipse, or a polygonal shape such as a triangle or a square can be used.

In addition, the diameter of the hair transplant hole 21-1B can be determined according to the thickness of the hair bundle 12-1, and can be specifically set appropriately within the 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, between the bottom surface 21-1a and the planting surface 21-1b) The thickness) can be, for example, 4.2 mm. In this case, the depth of the plurality of hair transplantation holes 21-1B based on the hair transplantation surface 21-1b can be, for example, 2.5 mm. The thickness of the head portion 14 is, as an example, the thickness measured at the center portion of the head portion 14 in the X direction.

The two support portions 21-2 are formed to protrude from the bottom surface 21-1a of the base member main body 21-1 in the Z direction (downward in the case of the state shown in FIG. 1). Of the two support portions 21-2, one 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 flat.

The two protruding surfaces 21-2a 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, the support portion 21-2 is a second exposed portion of the head portion 14 and is exposed on the side opposite to the hair transplantation surface 21-1b, as shown in FIG. 3 .

The protruding surface 21-2a is used to form the hard member 17 including the base member main body 21-1 using the first mold 41 shown in FIG. 11 described later. (See Figure 11) This is the part that contacts the inner surface.

In this way, the protruding surface 21-2a contacts the inner surface of the first mold 41 (see FIG. 11), thereby forming a first soft resin ( 22) can be formed.

That is, the amount of protrusion (in other words, the distance to the protruding surface 21-2a based on the bottom surface 21-1a) of the two supports 21-2 is the amount of protrusion placed on the bottom surface 21-1a. It is the same as the thickness of the first soft resin 22 in the Z direction.

Therefore, the amount of protrusion of the two support portions 21-2 can be appropriately set depending on 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 protrusion amount of the two support portions 21-2 is: For example, it can be set to 0.8 mm. The thickness of the head portion 14 and the base member main body 21-1 is, as an example, the thickness measured at the central portion of the head portion 14 in the X direction.

1 and 3 illustrate the case where there are two support portions 21-2, 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 integrally formed with the distal end 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 bending elastic modulus (JIS K7203) within the range of 500 to 3000 MPa can be used.

Specific examples of such hard resins include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylenedimethylene terephthalate (PCT), polyacetal (POM), Examples include polystyrene (PS), acrylonitrile-butadiene-styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, and acrylonitrile-styrene copolymer resin (AS). , Among them, polybutylene terephthalate (PBT) is preferable.

Since polybutylene terephthalate (PBT) has high bending strength, it can prevent the base member 21 from being folded or partially missing. The above hard resin may be used individually, or two or more types may be used in appropriate combination.

The first soft resin 22 is attached to the base member main body ( It is installed to cover the side and bottom surface (21-1a) of 21-1).

Accordingly, the first soft resin 22 is arranged to cover the distal end 21-1A of the base member main body 21-1.

In this way, the first soft resin 22 is disposed so as to cover the distal end 21-1A of the base member main body 21-1, so that when the user uses the toothbrush 10, the distal end 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 by the user. It can prevent damage to the user's oral cavity when it is strongly pressed into the user's oral cavity.

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

1 to 3 illustrate the case where the first soft resin 22 is installed to cover the side and bottom surfaces 21-1a of the base member main body 21-1 as an example, but the first soft resin 22 is provided as an example. The soft resin 22 may be disposed so as to cover at least the distal end 21-1A of the base member main body 21-1.

As the first soft resin 22, for example, a soft resin having a JIS K 7215 Shore A hardness of 90 or less may be used. Examples of such soft resins include elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, and polyester-based elastomers. Among these, styrene-based elastomers are preferable from the viewpoint of weldability with polypropylene (PP).

Specific examples of styrene-based elastomers include Sefton (brand name) manufactured by KURARAY CO., LTD and Rheotomer (brand name) manufactured by Riken Technos Corporation.

Additionally, the first soft resin 22 may be appropriately selected depending on 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, for example, a polyolefin-based elastomer or a styrene-based elastomer, and a styrene-based elastomer is preferred. It is more desirable.

By using the combination of the hard resin constituting the base member 21 and the first soft resin 22 as described above, sufficient adhesion between the base member 21 and the first soft resin 22 can be ensured.

The length of the head portion 14 (length in the

If the length of the head portion 14 is 10 mm or more, a sufficient area of the hair transplantation surface 21-1b on which the hair bundle 12-1 can be planted can be secured. Additionally, if the length of the head portion 14 is 30 mm or less, the operability of the toothbrush 10 in the oral cavity can be improved.

The width of the head portion 14 with the above configuration (maximum width in the Y direction of the head portion 14) is not particularly limited, and is preferably within the range of 7 to 13 mm, for example, and 8 to 12 mm. I am more desirable.

If the width of the head portion 14 is 7 mm or more, a sufficient area of the hair transplantation surface 21-1b on which the hair bundle 12-1 is planted can be secured.

Additionally, if the width of the head portion 14 is 13 mm or less, the operability of the toothbrush 10 in the oral cavity can be improved.

Here, with reference to FIG. 2, the position of the boundary between the rear end of the head portion 14 and the front end of the neck portion 15, and the position of the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16. define.

In the present invention, between the hair transplantation surface 21-1b and the handle portion 16, a location where the width in the Y direction is equal to the maximum width of the head portion 14 or is smaller than the maximum width of the head portion 14 is selected as the neck portion. Included in

Additionally, in this embodiment, in the The position where this almost disappears is taken as the position of the boundary between the rear end of the head part 14 and the front end of the neck part 15.

In addition, in the The position is set at the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16.

Additionally, in the present invention, the position of the rear end side of the handle portion 16 of the hair transplant hole disposed at the position furthest away from the distal end of the head portion 14 in the X direction from the distal end of the head portion 14 is determined by It may be used as the position of the boundary between the rear end of (14) and the front end of the neck portion (15).

The length of the neck portion 15 in the It can be set appropriately within the 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 widths of the head portion 14 and the handle portion 16. The thickness of the neck portion 15 in the Z direction can be, for example, the same as the thickness of the head portion 14.

The neck portion 15 has a core portion 25, which is a component of the hard member 17, and a soft portion 26.

The core portion 25 extends in the It is integrated with (25-1) and has a second part (25-2) disposed in a part of the handle portion (16).

In addition, here, the first part 25-1 constituting the neck part 15 is explained, and the second part 25-2 is explained when explaining the structure of the handle part 16.

FIG. 8 is a cross-sectional view taken along line B-B of the hard member (specifically, the first portion) shown in FIG. 4. In Fig. 8, the same components as the structures shown in Figs. 1 to 6 are given the same reference numerals. In addition, in FIG. 8, for convenience of explanation, symbols for components of the toothbrush 10 other than those of the hard member 17 are also shown. In Figure 8, for convenience of explanation, the neck portion 15 is denoted by a symbol.

1 to 6 and 8, one end of the first part 25-1 is integrated with the rear end of the base member 21, and the other end is integrated with the second part 25-2. It consists of:

The first part 25-1 is made of hard resin. The first part 25-1 is made of a hard resin (bending elastic modulus (JIS K7203) in the range of 500 to 3000 MPa) that is harder than the first soft resin 22 and the second soft resin 27 constituting the soft part 26. It is composed of hard resin within.

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 portion 14, the neck portion 15 is bent (changed) at the deformation portion 15A shown in FIG. 2 (e.g., near the center of the neck portion 15). In other words, the thickness and shape of the first part 25-1 (so as to drain the force applied to the tip of the head part 14), and the soft part 26 disposed around the first part 25-1. ), the thickness can be determined.

Specifically, the area of the cut surface of the neck portion 15 (cut surface of the first portion 25-1) obtained when the central portion of the neck portion 15 in the When the area (S1) of 25-1a) and the area (S2) of the cut surface of the soft portion 26 are set to 100%, the cut surface (25-1a) of the first portion (25-1) is 100%. The area S1 may be set to 5% or more and less than 50%, and is preferably set to, for example, 27%.

The shape of the first portion 25-1 when cut on a plane perpendicular to the X direction can be, for example, circular, oval, square, rectangular, diamond, star, etc. Additionally, considering the user's safety, the corners of the first portion 25-1 may be rounded.

However, when brushing teeth using the toothbrush 10, the neck portion 15 is deformed in the Z direction (in other words, the direction in which force is applied when pressing the tip of the brush portion 12 to the teeth, interdentals, etc.) Something that is difficult to do (in other words, something that can reliably press the tip of the brush portion 12 to teeth, interdentals, etc.) is desirable.

Therefore, the first width W1 of the first portion 25-1 in the Z direction (the first direction orthogonal to the hair transplantation surface 21-1b) is the Y direction (the second direction orthogonal to the Z direction) ) 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.

In this way, the cleaning performance of the toothbrush 10 is reduced by making the first width W1 of the first part 25-1 in the Z direction larger than the second width W2 of the first part in the Y direction. When a strong external force is applied to the tip of the head portion 14 without being told to do so, the deformable portion 15A can be bent in the Y direction. Accordingly, it becomes possible to discharge the force applied to the tip of the head portion 14, thereby preventing damage to the user's oral cavity of the toothbrush 10.

In particular, when the user of the toothbrush 10 is an infant aged 1 to 3 years, there are cases where the user runs with the toothbrush 10 in the mouth, but even when the infant falls over in this case, the inside of the infant's oral cavity is damaged. can be prevented from happening.

As a cross-sectional shape of the first portion 25-1 in which 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, Examples include ellipse, rectangle, and diamond shape as shown in FIG. 8. In this case, an ellipse includes not only a curve created from a set of points where the sum of the distances from two foci is constant, but also an ellipse in which two semicircles of the same radius are connected by two parallel tangents.

When using the first portion 25-1 having an elliptical or diamond-shaped cross-sectional shape, it may be configured so that the maximum value of the first width W1 is greater than the maximum value of the second width W2.

Additionally, in Fig. 8, when the diameter R1 of the neck portion 15 is 3.95 mm, the first width W1 can be, for example, 1.975 mm. At this time, the second width W2 can be, for example, 1.7 mm.

The soft portion 26 accommodates the first portion 25-1 therein and is made of a second soft resin 27 that is softer than the hard resin constituting the core portion 25. The soft portion 26 is a member that prevents the first portion 25-1 from being exposed, and when a strong force is applied to the tip of the head portion 14, the deformed portion 15A of the neck portion 15 It is a member for bending.

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 illustrated when explaining the first soft resin 22 can be used.

The second soft resin 27 may be made of a different type of soft resin than 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 that of the soft resin used as the second soft resin 27. With this configuration, the hardness of the tip of the head portion 14 and the hardness of the neck portion 15 can be made different.

Additionally, the same type of soft resin may be used as the first and second soft resins 22 and 27. Accordingly, the number of types of soft resin used when manufacturing the toothbrush 10 can be reduced.

In FIG. 8 , the case where the cut surface of the soft portion 26 has a circular outer shape is described as an example, but the outer shape of the cut surface of the soft portion 26 is not limited to this.

For example, when using the first part 25-1 in which the cut surface 25-1a shown in FIG. 8 has an oval shape, as the external shape of the cut surface of the soft portion 26, for example, a part of the long axis is the cut surface. You may use an oval shape that coincides with the long axis of (25-1a) or the oval shape described above. Additionally, when the cut surface 25-1a is oval-shaped, oval-shaped, or polygonal-shaped, the diameter R1 of the neck portion 15 may be set to a value according to the circumscribed circle of the cut surface 25-1a.

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

FIG. 9 is a cross-sectional view taken along line C-C of the hard member (specifically, the second portion) shown in FIG. 4. FIG. 10 is a cross-sectional view taken along line D-D of the hard member (specifically, the second portion) shown in FIG. 4.

In FIGS. 9 and 10, the same components as the structures shown in FIGS. 1 to 6 are given the same reference numerals. 9 and 10 show symbols for the handle unit 16 for convenience of explanation. 9 and 10 also show symbols for components of the toothbrush 10 other than those of the handle portion 16 for convenience of explanation.

Referring to FIGS. 1 to 6, 9, and 10, the second part 25-2 is made of hard resin, and one end of it is integrated with the first part 25-1. The hard resin constituting the second part 25-2 can be, for example, the same as the hard resin constituting the first part 25-1.

The second part 25-2 has a cross-sectional shape perpendicular to the It has a similar structure. That is, of the second portion 25-2, the portion where the plurality of protrusions 29 are formed has the largest diameter.

In addition, of the second portion 25-2, the portion disposed on the rear end side of the handle portion 16 rather than the plurality of protruding portions 29 faces the rear end side of the handle portion 16 from the plurality of protruding portions 29. Accordingly, the cross-sectional shape perpendicular to the X direction is similar in shape with the diameter continuously decreasing.

In this way, among the second portions 25-2, the shape of the portion disposed on the rear end side of the handle portion 16 rather than the plurality of protruding portions 29 is changed from the plurality of protruding portions 29 to the rear end side of the handle portion 16. By forming a shape in which the diameter becomes smaller as the direction goes, for example, in the case where the same soft resin is used as the first and second soft resins 22 and 27, a second mold (as shown in FIG. 12 described later) is formed. After arranging the hard member 17 in the second mold 51, when the soft resin is introduced into the second mold 51 from the rear end side of the second mold 51, the direction toward the tip of the head portion 14 (X direction) ), the soft resin becomes easy to move (flow), so the entire hard member 17 (excluding the tufting surface 21-1b and the plurality of tufting holes 21-1B) can be covered with soft resin with high precision. You can.

In addition, as described later, when the soft resin is introduced into the second mold 51, the position and posture of the hard member 17 within the second mold 51 are prevented from changing due to the introduced soft resin. can do.

In addition, as shown in FIG. 2, it is preferable that the second portion 25-2 is installed inside the distal end of the handle portion 16, but it is not limited to this. The second portion 25-2 may be built into the neck portion 15, for example.

In the case of this embodiment, four plurality of protrusions 29 are formed as an example. The four protrusions 29 are arranged in the circumferential direction of the portion with the largest diameter of the second portion 25-2.

The angle formed by the two protrusions 29 disposed at adjacent positions can be, for example, 90°. The space formed between the two protrusions 29 arranged at adjacent positions functions as a path for introducing the soft resin into the second mold 51 shown in FIG. 12, which will be described later. The soft resin is supplied to the tip side of the head portion 21 through the space and solidifies (cures) to become the first soft resin 22.

Each of the plurality of protrusions 29 has a protrusion surface 29a. The protruding surfaces 29a of the plurality of protruding 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 the outer surface of the handle portion main body 31 (handle portion ( It is configured to avoid the external aspect of 16).

1, 2 and 10, the protrusion 29 as the first protrusion located on the +Z side is connected to the hair transplantation surface 21 through the opening 31a of the handle portion 31 (soft portion 26). -Exposed to side 1b). The protrusion 29 as the second protrusion located on the -Z side is exposed to the side opposite to the hair transplantation surface 21-1b through the opening 31b of the handle portion 31 (soft portion 26). The protrusion 29 located on the +Y side is exposed to the +Y side through the opening 31c of the handle portion 31 (soft portion 26). The protrusion 29 located on the -Y side is exposed to the -Y side through the opening 31c of the handle portion 16 (soft portion 26). 1 and 2, the soft portion 26 of the handle portion 16 has a tapered portion 31A that tapers toward the distal end, and the opening portions 31a to 31d have a tapered portion ( 31A). In other words, the protruding portion 29 is exposed to the outside through the opening portions 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 circular. Accordingly, each protruding surface 29a is exposed to the outside in the radial direction and is also exposed to the direction perpendicular to the longitudinal and radial directions of the toothbrush 10. Specifically, for example, in FIG. 10, the protruding surface 29a of the protrusion 29 as the first protrusion located on the +Z side is exposed facing the +Z side, and the protruding surface 29a is exposed to the +Y side and -Y side. exposed to the side. Similarly, for example, in FIG. 10, the protruding surface 29a of the protrusion 29 as the second protrusion located on the -Z side is exposed facing the -Z side and is exposed on the +Y side and -Y side. Avoid and expose.

The plurality of protrusions 29 are used to mold the handle body 31 by placing the hard member 17 in the space 53 of the second mold 51 (see FIG. 12). When the protruding surface 29a contacts the inner surface of the second mold 51, the posture of the hard member 17 in the space is maintained together with the two support portions 21-12 constituting the base member 21. It has the function (details will be explained later). In a state where the hard member 17 is accommodated in the second mold 51, the four protrusions 29 have their protruding surfaces 29a contacting the inner surface of the second mold 51, so that the hard member 17 is exposed from four directions. ) supports the rear end of the

The protrusion amount 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 amount of protrusion of the plurality of protrusions 29 is a value that is flush with the surface of the second soft resin 27 depending on the desired thickness of the second soft resin 27 disposed around the plurality of protrusions 29. It can be set appropriately.

In Fig. 10, when the diameter R2 of the second portion 25-2 is 5.6 mm, the protrusion amount T1 of the plurality of protrusions 29 can be, for example, 1.77 mm.

In addition, in FIGS. 1 to 6 and FIG. 10, the case of having four protrusions 29 is described as an example of the plurality of protrusions 29, but the number of the plurality of protrusions 29 is limited to four. It doesn't work.

For example, the number of the plurality of protrusions 29 may be, for example, three (in this case, arranged so that the angle formed by the protrusions 29 arranged at adjacent positions is 120°), or two or more. It may be 8 or less.

In addition, the shape of the plurality of protrusions 29 may be any shape that has a flow path capable of flowing the soft resin from the rear end side of the plurality of protrusion parts 29 to the front end side of the base member 21, as shown in FIGS. 1 to 6, and the shape of the protrusion 29 shown in FIG. 10 is not limited to a cylindrical shape. The cross-sectional shape of the plurality of pillar-shaped protrusions 29 may be, for example, a star shape or a heart shape, which is excellent in design.

Referring to FIGS. 1 to 3, the handle body 31 is the part of the toothbrush 10 that the user holds with his hand, and is made of a second soft resin 27.

In this way, the handle body 31 is made of the second soft resin 27, so that a strong external force is applied in the direction from the rear end of the toothbrush 10 to the front end of the head 14 when the toothbrush 10 is held in the mouth. When this is applied, it becomes possible to deform (specifically, bend) the handle portion main body 31.

Accordingly, not only the neck portion 15 but also the handle portion main body 31 is bent, making it possible to discharge the external force from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction, so that the toothbrush 10 Damage to the user's oral cavity can be prevented.

In addition, by constructing the handle portion main body 31 using the second soft resin 27, the handle portion 16 is damaged even when a strong force is applied to the handle portion main body 31 (in other words, the handle portion 16 is damaged). (16) can be suppressed from folding.

The ring-shaped depressions 32-1 and 32-2 are formed in an annular shape over the entire circumferential direction of the handle portion main body 31. The ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16 rather than the arrangement position of the second portion 25-2. The ring-shaped depression 32-1 is formed 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

The ring-shaped depression 32-2 is disposed at a distance of, for example, 20 mm to 50 mm from the rear end of the handle portion 16 from the arrangement position of the ring-shaped depression 32-1. The ring-shaped depression 32-2 is formed 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

In this way, by arranging 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, the toothbrush 10 can be held in the mouth. When a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the front end of the head portion 14, the handle portion at the arrangement position of the ring-shaped depressions 32-1 and 32-2 as the second deformation portion. (16) can be easily bent.

Accordingly, it becomes possible to more efficiently discharge the external force applied in the direction from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction, thereby further suppressing damage to the user's oral cavity of the toothbrush 10. You can.

In addition, by arranging the ring-shaped depressions 32-1 and 32-2 formed by reducing the diameter of the handle body 31 in the Because it becomes easier to lift the part 16, the operability of the toothbrush 10 can be improved.

1 to 3 illustrate the case where two ring-shaped depressions 32-1 and 32-2 are formed in the handle body 31, but the ring-shaped depressions 32-1, The number of 32-2) is not limited to two. The ring-shaped depressions 32-1 and 32-2 may be formed in the handle body 31 in the number of one or more and five or less as necessary.

In addition, the arrangement position of the ring-shaped depressions 32-1 and 32-2 may be formed in the handle unit main body 31 located rearward than the arrangement position of the second part 25-2, and Figs. It is not limited to the arrangement positions of the ring-shaped depressions 32-1 and 32-2 shown in 3.

A plurality of the first rib portions 34 are arranged in a portion of the ring-shaped depression portion 32-1 that constitutes the side surface (in other words, two side surfaces) of the handle portion main body 31.

The second rib portion 35 is disposed in plural numbers on a portion of the ring-shaped depression portion 32-2 that constitutes the side surface (in other words, two side surfaces) of the handle portion main body 31.

A plurality of third rib portions 37 are disposed on the side (in other words, two sides) of the handle portion main body 31 located on the rear end side from the arrangement position of the second rib portion 35.

The first to third rib portions 34, 35, and 37 may be made of a second soft resin (27). In this case, the first to third rib portions 34, 35, and 37 can be formed all together when forming the handle portion main body 31.

Additionally, the first to third rib portions 34, 35, and 37 are not absolutely necessary and may be absent.

In this way, the plurality of first ribs 34 arranged in the ring-shaped depression 32-1, the plurality of ring-shaped depressions 32-2 arranged in the ring-shaped depression 32-2, and the second ribs 34 are arranged in the ring-shaped depression 32-1. By having a plurality of third rib portions 37 disposed on the side of the handle portion main body 31 located at the rear end side from the arrangement position of the rib portion 35, the finger holding the toothbrush 10 becomes difficult to slip. Therefore, the grip performance of the handle main body 31 can be improved.

Referring to FIG. 1, the brush portion 12 is composed of bristle bundles 12-1 implanted in a plurality of hair tucking holes 21-1B formed in the base member 21. A bundle of hair (12-1) is a bundle of multiple hairs.

The length (hair length) of the hair bundle 12-1 based on the hair transplantation surface 21-1b can be determined by taking into consideration the hair elasticity required for the hair bundle 12-1. Specifically, the length (hair length) of the hair bundle 12-1 can be appropriately set within the range of, for example, 6 to 13 mm.

The hair bundle 12-1 may be comprised, for example, of a plurality of hairs having the same hair length, or may be comprised of a plurality of hairs having different hair lengths.

In Figure 1, as an example of the brush portion 12 constituting the toothbrush 10, a case where the tips of the plurality of bristle bundles 12-1 constituting the brush portion 12 are aligned is shown as an example. However, in this case, It is not limited.

For example, a step may be formed in the brush portion 12 by varying the lengths of the plurality of bristle bundles 12-1 constituting the brush portion 12.

The thickness (hair bundle diameter) of the hair bundle 12-1 can be determined in consideration of the hair elasticity required for the hair bundle 12-1, but can be appropriately set within the range of, for example, 1 to 2 mm. .

All hair bundles 12-1 may have the same hair bundle diameter or may be different from each other.

Examples of the plurality of hairs constituting the bristle bundle 12-1 include, for example, tapered hairs, which are hairs whose diameters become smaller as they move toward the bristle tips and whose tips are sharpened, and hair tips that are cut from the hair transplantation surface 21-1b. Straight hair, which is hair with approximately the same diameter, can be used.

In addition, as straight hair, for example, those whose tips are in a plane substantially parallel to the hair transplantation surface 21-1b or those whose tips are rounded into a hemispherical shape can be used.

The material of the hair constituting the hair bundle 12-1 is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terete. Examples include resin materials such as polyesters such as phthalate (PTT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN), and polyolefins such as PP.

The above resin materials that become the material of the hair may be used individually, or two or more types may be used in combination.

In addition, as the hair constituting the hair bundle 12-1, for example, a polyester hair material having a multi-center structure having a core portion and at least one layer of sheath formed on the outside of the core portion may be used.

The cross-sectional shape of the hair constituting the hair bundle 12-1 is not particularly limited, and for example, circles such as round and oval, polygons, star shapes, three-leaf clover shapes, and four-leaf clover shapes can be used.

The cross-sectional shapes of all bristles constituting the brush portion 12 may be the same or different.

The thickness of the hair constituting the hair bundle 12-1 can be determined by taking into account the material of the hair. When the cross-section of the hair is circular, the thickness of the hair can be, for example, 6 to 9 mil. Also, 1mil is 0.0254mm.

In addition, the hair bundle 12-1 may be configured by arbitrarily combining a plurality of bristles with different thicknesses in consideration of the feeling of use, feeling of cleansing, cleaning effect, durability, etc.

According to the toothbrush of the present embodiment, the head portion 14, at least the tip of which is made of the first soft resin 22 and has a bristle-flocking surface 21-1b, and the handle main body 31 made of the second soft resin 27. ) and a neck portion 15 connecting the head portion 14 and the handle portion 16, and the neck portion 15 extends in the direction (X direction) of the neck portion 15. ) and a core portion (25) made of a hard resin that is harder than the first soft resin (22), and a second soft resin (27) that accommodates the core portion (25) inside and is made of a soft resin (27) that is softer than the hard resin. By including the portion 26, when a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the front end of the head portion 14 while the user is holding the toothbrush 10, the second soft resin 27 is applied. By deforming (specifically bending) the neck portion 15 and the handle portion 16, which constitute the components, it becomes possible to release the force applied to the tip of the head portion 14, and the head portion 14 ), it is possible to bring the first soft resin 22 disposed at the tip of the toothbrush 10 into contact with the user's oral cavity, thereby preventing damage to the user's oral cavity of the toothbrush 10.

In particular, when the user of the toothbrush 10 is a child aged 1 to 3 years, there are cases where the user runs with the toothbrush 10 in the mouth, but in this case, even when the child is turned over, the inside of the child's oral cavity may Damage can be prevented.

In addition, in this embodiment, the case where the hard member 17 having the base member 21, the core portion 25, and the plurality of protrusions 29 is used as a component of the toothbrush 10 has been described as an example. For example, a toothbrush (hereinafter referred to as “toothbrush Q” for convenience of explanation) may be constructed using a hard member excluding the base member 21 as a component (hereinafter referred to as “hard member P” for convenience of explanation). , In this case, the same effect as the toothbrush 10 of this embodiment can be obtained.

In this case, the hard member P may be configured to have a plurality of protrusions 29 not only on the rear end side of the core portion 25 but also on the distal end side of the core portion 25.

With this configuration, when the 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 external shape of the toothbrush Q, the hardness in the mold is Since it becomes possible to maintain the posture (position) of member P, toothbrush Q can be manufactured with high precision.

Additionally, when manufacturing toothbrush Q (specifically, when transplanting bristle bundles), it is good to use the in-mold method.

Fig. 11 is a cross-sectional view showing the manufacturing process of the toothbrush of this embodiment, and is a diagram for explaining the process of forming a hard member using the first mold. Fig. 12 is a cross-sectional view showing the manufacturing process of the toothbrush of this embodiment, and is a diagram for explaining the process of forming the first soft resin, the soft portion, and the handle portion main body using the second mold.

In FIGS. 11 and 12, the same components as the structures shown in FIGS. 1 to 10 are given the same reference numerals. In addition, the arrow shown in FIG. 11 indicates the direction in which the hard resin is introduced, and the arrow shown in FIG. 12 indicates the direction in which the soft resin (soft resin N described later) is introduced.

Next, the manufacturing method of the toothbrush 10 of this embodiment is demonstrated mainly with reference to FIGS. 1, 11, and 12.

In addition, herein, the following explanation is made by taking the case where the same type 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.

Initially, in the process shown in FIG. 11, it consists of a pair of molds 41-1 and 41-2, and a space 43 corresponding to the shape of the hard member 17 inside and a hard resin is introduced into the space 43. A first mold 41 having an introduction port 45 for the following is prepared.

The mold 41-2 is formed with protrusions (not shown) for forming a plurality of tufting holes 21-1B. Additionally, the inlet 45 is arranged at the rear end of the space 43.

Next, the space 43 is filled with a molten hard resin (a resin with a bending elastic modulus (JIS K7203) within the range of 500 to 3000 MPa) that becomes the base material of the hard member 17 through the inlet 45, When the hard resin hardens, a hard member ( 17) is formed. After that, the hard member 17 is taken out from the first mold 41.

Next, in the process shown in FIG. 12, it consists of a pair of molds 51-1 and 51-2, a space 53 corresponding to the shape of the toothbrush 10 excluding the brush portion 12 shown in FIG. 1, and A second mold 55 having an introduction port 55 for introducing the hard resin into the space 53 is prepared. The joint surface of the pair of molds 51-1 and 51-2 is set at the middle position in the Z direction of the soft portion 26 (handle portion main body 31) shown in Figs. 8 to 10, for example. there is.

The mold 51-2 is formed with protrusions (not shown) for forming a plurality of tufting holes 21-1B. Additionally, the inlet 55 is located at the rear end of the space 53.

In addition, the second mold 51 includes ring-shaped depressions 32-1 and 32-2, a first rib portion 34, a second rib portion 35, and a third rib portion 37 shown in FIG. 1. ) is formed to form a protrusion.

Next, the hard member 17 is placed 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 hair transplantation surface 21-1b are brought into contact so that the plurality of hair transplantation holes 21-1B are covered, and the end surfaces of the two support portions 21-2 and the mold 51 -1), the inner surface of the second mold 51 is further brought into contact with the protruding surface 29a of the plurality of protrusions 29 (four in the case of this embodiment).

Accordingly, the first soft resin 22 and the second soft resin 27 (soft resin constituting the soft portion 26 and the handle portion main body 31) are formed in the space 53 of the second mold 51. When the soft resin N is introduced, the position and posture of the hard member 17 within the second mold 51 can be maintained.

That is, the protruding surface 29a of the protrusion 29 located on the +Z side is in contact with the inner surface of the mold 51-2, and the protruding surface 29a of the protrusion 29 located on the -Z side is in contact with the mold ( The hard member 17 is positioned in the Z direction by contacting the inner surface of 51-1). In addition, the protruding surface 29a of the protrusion 29 located on the +Z side and the protrusion 29 located on the -Z side are both facing the +Y side and the -Y side, so that the mold 51-1 ), the position is also determined in the Y direction by contacting the inner surface of the mold 51-2.

In addition, the end surfaces of the two supports 21-2 and the protruding surfaces 29a of the plurality of protrusions 29 contact the inner surface of the second mold 51, thereby forming a gap between the hard member 17 and the second mold 51. A gap for forming the first soft resin 22 and the soft portion 26 can be secured.

Next, the space 53 is filled with melted soft resin N (resin with a JIS K 7215 Shore A hardness of 90 or less) through the inlet 55.

The inner surfaces of the mold 51-1 and the mold 51-2 at the position corresponding to the tapered portion 31A are shortened at a distance from each other so that the front becomes thinner toward the distal end, so that a protruding surface ( When 29a) comes into contact, movement of the hard member 17 toward the distal end is prevented. Therefore, the hard member 17 is positioned without moving in the

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. A dividing line of minute protrusions is formed on the surface of the soft portion 26 at a position opposite to the joint surface of the mold 51-1 and the mold 51-2 (approximately the middle position in the Z direction).

Accordingly, a handle body 11 having a head portion 14, a neck portion 15, and a handle portion 16 is formed. After that, the handle body 11 is pulled out from the second mold 51.

Next, as shown in FIG. 1, the hair bundles 12-1 are planted into the plurality of hair transplantation holes 21-2 of the head portion 11. Accordingly, the toothbrush 10 of this embodiment shown in FIG. 1 is manufactured.

As a method of transplanting the hair bundle 12, for example, the hair bundle 12-1 is folded in two, and then a thin flat wire (made of metal (for example, brass)) is placed on the inside of the hair bundle 12-1. A flat wire transplantation method can be used in which a flat wire is inserted and the hair bundle 12-1 with the flat wire inserted is planted in the hair transplant hole 21-2.

In addition, in this embodiment, the case of using the flat wire hair transplantation method as the hair transplantation method of the hair bundle 12-1 was explained as an example, but instead of this method, for example, the resin (soft soft material) constituting the head portion 14 A heat fusion method of fixing the lower end of the hair bundle 12-1 by pressing it into a resin or hard resin, or heating the lower end of the hair bundle 12-1 to form a molten mass and then introducing the molten resin into the mold. You can also use the in-mold method as instructed.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

For example, in the above embodiment, a configuration in which the soft portion 26 is formed at the distal end of the head portion 14 is illustrated, but it is not limited to this, and as shown in the side view of FIG. 13 and the front view of FIG. 14, the neck It may be configured to include a deformable portion 15A in the portion 15 and to form a soft portion 26 on the rear end side from the deformed portion 15A.

In addition, the present invention is widely applicable to toothbrushes such as so-called one-tuft toothbrushes with one bristle bundle and toothbrushes with a tongue removal portion.

In addition, in the above embodiment, a neck portion (maximum width in the Y direction) whose width in the second direction (Y direction) is smaller than the width of the head portion 14 (maximum width in the Y direction) is provided between the hair transplantation surface 21-1b and the handle portion 16. Although the toothbrush 10 on which 15) is disposed has been described, it is not limited to this configuration. For example, the width in the Y direction between the bristle surface 21-1b and the handle portion 16 is the head portion 14. A toothbrush in which a location equal to the maximum width of exists is also included in the present invention. In this case, the deformable portion is disposed as the neck portion, and at the rear end side from this deformable portion, a soft portion that accommodates at least part of the hard member and is made of soft resin is disposed.

The present invention can be used in a toothbrush that can prevent damage to the user's oral cavity.

10: Toothbrush 11: Handle body
12: brush part 14: head part
15: neck portion 15A: deformation portion
16: handle portion 17: hard member
21: Base member 21-1: Base member body
21-1a: bottom 21-1A: tip
21-1b: Hair transplantation surface (first exposed portion) 21-1B: Hair transplantation hole
21-2: support 21-2a: protruding surface
22: first soft resin 25: core
25-1: First part 25-1a: Cutting surface
25-2: first part 26: soft part
27: second soft resin 29: protrusion
29a: Protruding surface 31: Handle body
31A: Taper part
32-1, 32-2: Ring-shaped depression (second deformation portion)
34: first rib portion 35: second rib portion
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: 2nd width

Claims (14)

A head portion having a hair-flocking surface on the tip side,
It has a handle portion disposed at a rear end of the head portion and includes a handle portion main body,
a deformation portion disposed between the hair transplantation surface and the handle portion and deformed by an external force applied to the head portion;
a hard member disposed from the head portion to a portion of the distal end of the handle portion and formed of hard resin;
A soft portion disposed toward the rear end in the x-direction, which is the direction in which the handle portion extends from the deformation portion, to accommodate at least a portion of the hard member therein, and formed of a soft resin;
Includes a neck portion connecting the head portion and the handle portion,
The hard member between the hair-flocking surface and the handle portion has a first width in a first direction orthogonal to the hair-flocking surface in a second direction orthogonal to the longitudinal direction of the handle portion and the first direction. greater than the second width in
On a plane perpendicular to the x-direction, when the sum of the area of the cut surface of the hard member obtained when the neck portion is cut and the area of the cut surface of the soft part is set to 100%, the area of the cut surface of the hard member is 5 A toothbrush characterized in that it is % or more and less than 50%. According to claim 1,
A toothbrush characterized by having a second deformable portion disposed on the handle portion and deformed by the external force. According to claim 2,
The handle portion has at least one ring-shaped depression with a reduced diameter relative to the direction in which the handle portion extends,
Toothbrush, characterized in that the second deformable portion is disposed at the position of the recessed portion. The method according to any one of claims 1 to 3,
The toothbrush characterized by the above-mentioned hard member having a first exposed portion exposed to the hair-flocking surface side of the head portion and a second exposed portion exposed to a side opposite to the hair-flocking surface. The method according to any one of claims 1 to 3,
The hard member has a column-shaped first protrusion that protrudes and exposes toward the hair transplantation surface in the handle portion, and a column-shaped second protrusion that protrudes and exposes a side opposite to the hair transplantation surface in the handle portion. Featured toothbrush. According to claim 5,
The first protrusion is exposed through a first opening formed on the hair transplantation surface side of the soft portion,
The toothbrush, wherein the second protrusion is exposed through a second opening formed on a side of the soft portion opposite to the bristle-flocking surface side. A head portion having a hair-flocking surface on the tip side,
It has a handle portion disposed at a rear end of the head portion and includes a handle portion main body,
a deformation portion disposed between the hair transplantation surface and the handle portion and deformed by an external force applied to the head portion;
a hard member disposed from the head portion to a portion of the distal end of the handle portion and formed of hard resin;
It is disposed toward the rear end in the x-direction, which is the direction in which the handle part extends from the deformation part, and accommodates at least a part of the hard member therein, and further includes a soft part formed of a soft resin,
The hard member has a column-shaped first protrusion that protrudes and exposes toward the hair transplantation surface in the handle portion, and a column-shaped second protrusion that protrudes and exposes a side opposite to the hair transplantation surface in the handle portion,
The first protrusion is exposed through a first opening formed on the hair transplantation surface side of the soft portion,
The second protrusion is exposed through a second opening formed on a side opposite to the hair transplantation surface side of the soft portion,
The soft portion of the handle portion has a tapered portion that tapers toward the distal end,
Toothbrush, characterized in that the first opening and the second opening are formed in the tapered portion. According to claim 5,
The soft portion has a dividing line on the surface,
The first protrusion is exposed on one side in a direction perpendicular to the hair transplantation surface with the dividing line interposed therebetween,
A toothbrush characterized in that the second protrusion is exposed on the other side in the orthogonal direction with the dividing line interposed therebetween. According to claim 5,
The hard member is arranged to extend to the handle portion,
A toothbrush, characterized in that the front end surface of the first protrusion and the front end surface of the second protrusion lie on the same surface as the outer surface of the handle portion. A head portion having a hair-flocking surface on the tip side,
It has a handle portion disposed at a rear end of the head portion and includes a handle portion main body,
a deformation portion disposed between the hair transplantation surface and the handle portion and deformed by an external force applied to the head portion;
a hard member disposed from the head portion to a portion of the distal end of the handle portion and formed of hard resin;
It is disposed toward the rear end in the x-direction, which is the direction in which the handle part extends from the deformation part, and accommodates at least a part of the hard member therein, and further includes a soft part formed of a soft resin,
The hard member has a column-shaped first protrusion that protrudes and exposes toward the hair transplantation surface in the handle portion, and a column-shaped second protrusion that protrudes and exposes a side opposite to the hair transplantation surface in the handle portion,
A toothbrush characterized in that, of the hard members, a portion disposed on a rear end side of the handle portion rather than the first protrusion portion and the second protrusion portion has a shape whose diameter becomes smaller as it moves toward the rear end side of the handle portion. The method according to any one of claims 1 to 3,
The head portion is made of a first soft resin that is softer than the hard resin at least at the tip,
The handle main body is made of a second soft resin that is softer than the hard resin,
Toothbrush, characterized in that the soft portion is composed of the second soft resin. delete The method according to any one of claims 1 to 3,
The hard member in the head portion includes a base member having the tufting surface and a plurality of tufting holes,
The head portion is made of a first soft resin that is softer than the hard resin at least at the tip,
The first soft resin is disposed to cover a portion of the base member with the hair planting surface and the plurality of hair planting holes exposed. The method according to any one of claims 1 to 3,
The neck portion is disposed between the hair transplantation surface and the handle portion, and the width of the first direction orthogonal to the hair transplantation surface and the second direction orthogonal to the longitudinal direction of the handle portion is less than or equal to the width of the head portion. .

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