KR20170051379A - Toothbrush - Google Patents

Abstract

SUMMARY OF THE INVENTION It is an object of the present invention to provide a toothbrush capable of suppressing damage to the user's mouth. And a handle portion 16 which is disposed on the rear end side of the head portion and includes the handle portion main body 31. The handle portion 16 is provided between the kneading surface and the handle portion, A rigid member 17 formed of a hard resin and disposed on a part of a front end side of the handle portion from the head portion and a rigid member 17 disposed on the rear end side from the deformation portion, And at least a part of the member, and a soft portion 26 formed of a soft resin.

Description

Toothbrush {TOOTHBRUSH}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush, and more particularly, to a toothbrush capable of suppressing damage to a user's mouth.

The present application claims priority based on Japanese Patent Application No. 2014-177334 filed on September 1, 2014, the contents of which are incorporated herein by reference.

Conventionally, when using a toothbrush (specifically, when the toothbrush is in a mouth state at the mouth), there is a case where an external tooth injury is caused by conduction. In particular, when the user of the toothbrush is an infant 1 to 3 years old, There are many wearing cases.

Background Art [0002] There is a toothbrush disclosed in Patent Document 1 as a toothbrush capable of suppressing defects and tumbling of a head portion and a neck portion.

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

Further, in Patent Document 1, the total thickness of the head portion and the neck portion (thickness obtained by summing 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 and the base constituting the neck portion 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 discloses a structure in which even when an excessive load is applied to the head portion or the neck portion, it is possible to make the handle portion difficult to be broken. However, even when the head portion or the neck portion is bent, Is disclosed.

In the toothbrush disclosed in Patent Document 1 having the above-described structure, the soft resin functions as a cushioning member when the teeth constituting the tip portion of the head portion are covered with the soft resin, and when the tooth is strongly chewed or when the tip of the head portion is strongly touched.

Therefore, by using the toothbrush disclosed in Patent Document 1, damage in the mouth caused by the tip of the head can be suppressed.

Japanese Patent Application Laid-Open No. 2013-458

However, in the neck portion of the toothbrush disclosed in Patent Document 1, a covering layer made of a soft resin having a thickness smaller than that of the above-mentioned base so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck portion Mm.

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

For this reason, the head portion of the toothbrush disclosed in Patent Document 1 has a structure in which, for example, when the external force is applied in the extending direction of the toothbrush (specifically, the direction from the rear end to the tip end of the toothbrush) It is difficult to bend the external force to be transmitted sufficiently (however, it is easier to bend than when it is made of hard resin).

Therefore, if a strong external force is applied in the direction from the rear end to the tip end of the toothbrush in the mouth state of the toothbrush disclosed in Patent Document 1, the user's mouth may be damaged.

Especially, when the user of the toothbrush is an infant aged 1 to 3 years, the risk of damage to the oral cavity is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a toothbrush capable of suppressing damage to the mouth of a user.

In order to solve the above-described problems, a toothbrush according to an embodiment of the present invention has a head portion having a wedge-shaped surface on the tip side, and a handle portion disposed on the rear end side of the head portion and including a handle portion main body, A rigid member which is disposed between the handle portion and deformed by an external force to the head portion, a rigid member which is disposed from a part of the tip end side of the handle portion from the head portion, And a soft portion accommodating at least a part of the hard member therein and formed of a soft resin.

In the toothbrush according to the embodiment of the present invention, the second deforming portion is disposed on the handle portion and deformed by the external force.

Further, in the toothbrush according to the above-mentioned embodiment of the present invention, the handle portion has at least one ring-shaped depressed portion which is reduced in diameter with respect to the extending direction of the handle portion, and the second deformed portion is disposed at the arrangement position of the depressed portion .

In addition, in the toothbrush of the embodiment of the present invention, the hard member may include a first exposed portion exposed on the cooking cavity side of the head portion, and a second exposed portion exposed on the opposite side of the cooking cavity .

In addition, in the toothbrush according to the above-mentioned embodiment of the present invention, the rigid member may have a columnar first protrusion protruding from and protruding from the eating-compartment side of the handle portion, And a second projection projecting in a columnar shape protruding to the opposite side.

Further, in the toothbrush according to an embodiment of the present invention, the first projecting portion is exposed through a first opening formed on the side of the cooking cavity of the soft portion, and the second projecting portion is exposed on the cooking cavity side of the soft portion Is exposed through the second opening formed on the opposite side.

Further, in the toothbrush according to an embodiment of the present invention, the soft portion of the handle portion has a tapered portion that tapers toward the distal end side, and the first opening portion and the second opening portion are tapered portions As shown in Fig.

In the toothbrush of the embodiment of the present invention, the soft portion has a dividing line on the surface, the first projecting portion is exposed to one side in a direction orthogonal to the meatal surface with the dividing line therebetween, And the second projection is exposed to the other side in the orthogonal direction with the dividing line interposed therebetween.

In the toothbrush of the first aspect of the present invention, the rigid member is disposed so as to extend to the handle portion, and a distal end surface of the first protruding portion and a distal end surface of the second protruding portion are attached to the outer surface of the handle portion And is characterized in that it is a plane face.

In the toothbrush of the first aspect of the present invention, the portion of the rigid member which is disposed on the rear end side of the handle portion than the first and second projections may have a diameter Is reduced.

In addition, in the toothbrush according to an embodiment of the present invention, the head portion is made of a first soft resin having at least a tip portion taper than the hard resin, and the handle portion main body is made of a second soft resin tighter than the hard resin And the soft portion is composed of the second soft resin.

In addition, in the toothbrush according to the above-mentioned embodiment of the present invention, the rigid member between the kneading surface and the handle portion has a first width in a first direction perpendicular to the kneading surface, And is greater than a second width in a longitudinal direction and a second direction orthogonal to the first direction.

Further, in the toothbrush according to an embodiment of the present invention, the hard member in the head part includes the base member having the wicking surface and the plurality of hair-removal holes, and the first soft- And the cover member is disposed so as to cover a part of the base member in a state in which the plurality of hairpin holes are exposed.

In the toothbrush of the first aspect of the present invention, the width in the first direction orthogonal to the kneading surface and the second direction perpendicular to the longitudinal direction of the handle portion, between the kneading surface and the handle portion, And a neck portion having a width smaller than the width of the neck portion is disposed.

(Effects of the Invention)

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

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

Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings. The drawings used in the following description are for explaining the constitution of the embodiment of the present invention, and the sizes, thicknesses, dimensions and the like of the parts shown may differ from those of actual toothbrushes.

(Embodiments)

1 is a side view of a toothbrush according to an embodiment of the present invention. 2 is a front view of the toothbrush shown in Fig. In FIG. 2, the illustration of the brush portion 12 composed of a plurality of hair bundles 12-1 shown in FIG. 1 is omitted for convenience of explanation. 3 is a rear view of the toothbrush shown in Fig.

4 is an enlarged side view of the rigid member shown in Fig. Fig. 5 is an enlarged front view of the rigid member shown in Fig. 2; Fig. 6 is an enlarged rear view of the rigid member shown in Fig. 3;

In the structures shown in Figs. 1 to 6, the same components are denoted by the same reference numerals. The X direction shown in Figs. 1 to 6 indicates the extending direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used. The Y direction shown in Figs. 2, 3, 5, and 6 indicates the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and X direction).

The Z-direction shown in Figs. 1 and 4 shows a first direction orthogonal to the eating surface 21-1b in a state in which the toothbrush 10 is not used.

4 to 6, reference numerals of constituent elements of the toothbrush 10 other than the components of the hard member 17 are also shown for convenience of explanation.

Referring to Figs. 1 to 6, the toothbrush 10 of the present embodiment has a handle 11 and a brush 12.

The handle body 11 includes a head portion 14, a neck portion 15, a handle portion 16, a head portion 14, a neck portion 15, And a rigid member (17).

The neck portion 15 having the width in the second direction (Y direction) smaller than the width (the maximum width in the Y direction) of the head portion 14 is provided between the kneading surface 21-1b and the handle portion 16, The toothbrush 10 will be described.

The head portion 14 has a base member 21 made of a hard resin and a first soft resin 22 covering a part of the base member 21. The base member 21 is a part of the components of the rigid 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 is formed so that the outer shape of the head part 14 is formed to be 1 to 20 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 main body 21-1. Which is reduced by about 2 mm. The base member main body 21-1 has a tip portion 21-1A, a bottom surface 21-1a, a drinking surface 21-1b, and a foot hole 21-1B.

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

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

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 disposed on the opposite side of the heating surface 21-1b . The bottom surface 21-1a may be, for example, a flat surface.

The cooking cavity surface 21-1b has a flat surface. And the molding surface 21-1b exposes a plurality of hair-removal holes 21-1B. The heating core 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 formed by using the hard resin harder than the first soft resin 22, and the plurality of the hair-removal holes 21-1B and the hair- 1 from the soft resin 22 so that the mold halves 12-1 constituting the brush portion 12 can be flocked to the plurality of hair kneading holes 21-1B by the flat knitting method.

When the first soft resin 22, the soft portion 26, and the handle portion main body 31 are resin-molded by using the second mold 51 shown in Fig. 12, which will be described later, Is a surface that comes into contact with the inner surface of one of the molds 51-2 (see Fig. 12).

As described above, since the molding surface 21-1b comes into contact with the inner surface of one of the molds 51-2 constituting the second mold 51, the plurality of the molding holes 21-1B and the molding surface 21-1b are brought into contact with each other, It is possible to prevent the first soft resin 22 from being formed on the first soft resin layer 22.

A plurality of the hair-removal holes 21-1B are formed in the base member main body 21-1 on the side constituting the hair-removal surface 21-1b. The bristles 12-1 constituting the bristles 12 are formed in the bristle holes 21-1B.

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

Further, the number of the plurality of hair-removal bores 21-1B is not limited to the number of the hair-removal bores 21-1B shown in Fig. 2, and can be appropriately set within a range of, for example, 10 to 60 holes.

That is, the arrangement of the plurality of hairpin holes 21-1B and the number of hairpin holes 21-1B can be appropriately set according to the purpose.

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

The diameter of the hair-removal hole 21-1B can be determined according to the thickness of the hair bundle 12-1. Specifically, the diameter can be appropriately set within a range of, for example, 1 to 3 mm.

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 eating surface 21-1b) For example, 4.2 mm. In this case, the depth of the plurality of hair-removal holes 21-1B with reference to the molding surface 21-1b may be 2.5 mm, for example. The thickness of the head portion 14 is, for example, the thickness measured at the center portion in the X direction in the head portion 14. [

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). One of the two support portions 21-2 is disposed at the front end side of the base member main body 21-1 and the other is disposed at the rear end side of the base member main body 21-1. The two support portions 21-2 are disposed so as to face each other in the X direction. The two support portions 21-2 have projecting surfaces 21-2a each of which is a flat surface.

The two protruded surfaces 21-2a are exposed from the outer surface of the first soft resin 22 and are faced to the outer surface of the first soft resin 22. [ That is, the support portion 21-2 is exposed as the second exposed portion of the head portion 14 on the side opposite to the cooling surface 21-1b as shown in Fig.

The protruding surface 21-2a is formed in the first mold 41 when the hard member 17 including the base member main body 21-1 is molded using the first mold 41 shown in FIG. (See Fig. 11).

As described above, the protruding surface 21-2a comes into contact with the inner surface of the first mold 41 (see Fig. 11) to form the first soft resin (Fig. 11) on the periphery of the two supports 21-2 and the bottom surface 21-1a 22 can be formed.

That is, the amount of protrusion of the two support portions 21-2 (in other words, the distance to the protruding surface 21-2a with reference to the bottom surface 21-1a) is disposed on the bottom surface 21-1a Is equal to 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 in accordance with the thickness of the first soft resin 22 disposed on the bottom surface 21-1a. 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, For example, 0.8 mm. The thickness of the head portion 14 and the base member main body 21-1 is a thickness measured at the central portion in the X direction in the head portion 14 as an example.

1 and 3, two support portions 21-2 are exemplified. However, 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 constituted as described above is integrally formed 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) within the range of 500 to 3000 MPa can be used.

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

Since polybutylene terephthalate (PBT) has a high bending strength, it is possible to prevent the base member 21 from being folded or partially broken. These hard resins may be used singly or in a combination of two or more.

The first soft resin 22 is fixed to the base member main body 21 in such a state that the end face 21-2a of the two support portions 21-2 is exposed while the mold base 21-1b, 21-1 and the bottom surface 21-1a.

Thus, the first soft resin 22 is disposed so as to cover the distal end portion 21-1A of the base member main body 21-1.

When the user uses the toothbrush 10 by disposing the first soft resin 22 so as to cover the distal end portion 21-1A of the base member main body 21-1 as described above, Since the first soft resin 22 functions as a cushioning member, an external force is applied from the rear end side to the tip end side of the toothbrush 10, and the first soft resin 22 disposed at the tip end 21-1A, The user's oral cavity can be prevented from being damaged when being strongly pressed in the oral cavity of the user.

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 depending on the purpose However, it may be 0.8 mm, for example.

Although the first soft resin 22 is provided so as to cover the side surface and the bottom surface 21-1a of the base member main body 21-1 as an example in FIGS. 1 to 3, The soft resin 22 may be disposed so as to cover at least the tip end 21-1A of the base member main body 21-1.

As the first soft resin 22, for example, a soft resin whose hardness is JIS K 7215 Shore A hardness of 90 or less may be used. As such soft resin, for example, an elastomer resin such as a polyolefin elastomer, a styrene elastomer and a polyester elastomer can be mentioned, but a styrene elastomer is preferable from the viewpoint of the meltability with polypropylene (PP).

Specific examples of the styrene-based elastomer include Ceftone (trade name) manufactured by KURARAY CO., LTD, and Rheostomer (trade name) manufactured by Riken technos Corporation.

The first soft resin 22 may be appropriately selected depending on the kind of the hard resin constituting the base member 21. [

Concretely, 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 the styrene elastomer More preferable.

The combination of the hard resin and the first soft resin 22 constituting the base member 21 is made to be the above combination so that the adhesion between the base member 21 and the first soft resin 22 can be sufficiently secured.

The length (length in the X direction) of the head portion 14 having the above-described structure is not particularly limited, but is preferably in the range of 10 to 30 mm, more preferably in the range of 12 to 28 mm.

If the length of the head portion 14 is 10 mm or more, the area of the mold base 21-1b on which the mold halves 12-1 can be formed can be sufficiently secured. 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 enhanced.

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

If the width of the head portion 14 is 7 mm or more, the area of the worm face 21-1b where the worm wheel 12-1 is stitched can be sufficiently secured.

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

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, a portion in the Y direction which is the same as the maximum width of the head portion 14 or a portion that is smaller than the maximum width of the head portion 14 is provided between the kneading portion 21-1b and the handle portion 16, .

In the present embodiment, the width in the Y direction is narrowed in the X direction toward the rear end of the handle portion 16 from the tip end of the head portion 14, so that the variation amount of the width becomes large, The position of the boundary between the rear end of the head portion 14 and the front end of the neck portion 15 is determined.

Further, in the X direction from the tip end of the neck portion 15 toward the rear end of the handle portion 16, the width in the Y direction is widened, and the amount of change in the width becomes large. The position is defined as 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 knockout hole disposed at the position most distant from the front end of the head portion 14 in the X direction from the front end of the head portion 14, The position of the boundary between the rear end of the neck portion 14 and the front end of the neck portion 15 may be used.

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 length of the head portion and the length of the neck portion is, It can be appropriately set within a range of 85 mm.

The neck portion 15 is a portion for connecting the head portion 14 and the handle portion 16. The width of the neck portion 15 in the Y direction is made smaller 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 has a deep portion 25 which is a component of the rigid member 17 and a soft portion 26.

The deep portion 25 has a first portion 25-1 extending in the X direction (extending direction of the neck portion 15) and also penetrating the neck portion 15 and a second portion 25-1 extending in the X direction, And a second portion 25-2 which is integrated with the handle portion 16 and is disposed on a part of the handle portion 16. [

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 structure of the handle portion 16 is described.

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

Referring to Figs. 1 to 6 and 8, the first portion 25-1 is integrally formed with the rear end of the base member 21 at one end, and the other end is integrally formed with the second portion 25-2 .

The first portion 25-1 is made of a hard resin. The first portion 25-1 is made of a hard resin harder than the second soft resin 27 constituting the first soft resin 22 and the soft portion 26 (the flexural modulus (JIS K7203) is in the range of 500 to 3000 MPa And the like).

The first portion 25-1 has the same thickness in the X direction. When a strong external force is applied to the tip end of the head portion 14, the neck portion 15 is bent at the deformed portion 15A shown in Fig. 2 (for example, in the vicinity of the center portion of the neck portion 15) The thickness and shape of the first portion 25-1 and the thickness of the soft portion 26-1 disposed around the first portion 25-1 are set so that the soft portion 26-1 ) May be determined.

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

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

When the teeth are wiped using the toothbrush 10, the neck portion 15 is deformed in the Z direction (in other words, the direction in which the force is applied when the tip of the brush portion 12 is pressed against teeth, (In other words, it is possible to reliably press the tip of the brush portion 12 between teeth, teeth, etc.).

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

As described above, 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, the cleaning performance of the toothbrush 10 is lowered It becomes possible to bend in the Y direction in the deformed portion 15A when a strong external force is applied to the tip of the head portion 14 without causing the head portion 14 to deform. As a result, the force applied to the distal end of the head portion 14 can be released, so that damage to the mouth of the user of the toothbrush 10 can be suppressed.

In particular, when the user of the toothbrush 10 is a child of 1 to 3 years old, the toothbrush 10 may be run in a state of being in the mouth. However, in such a case, Can be suppressed.

As the 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 An ellipse, a rectangle, a diamond, and the like as shown in Fig. 8 can be exemplified. In this case, an ellipse includes an ellipse connected by two tangential lines parallel to two semicircles of the same radius, in addition to a curve formed from a set of points having a sum of distances from two focal points.

When the first portion 25-1 having an elliptical or diamond-like cross-sectional shape is used, the maximum value of the first width W1 may be larger than the maximum value of the second width W2.

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

The soft portion 26 is composed of the second soft resin 27 which receives the first portion 25-1 therein and is tighter than the hard resin constituting the core portion 25. [ The soft portion 26 is a member for restricting the exposure of the first portion 25-1 and the soft portion 26 is a member for restricting the deformation portion 15A of the neck portion 15 when a strong force is applied to the tip of the head portion 14. [ To be bent.

As the second soft resin 27, for example, a soft resin having a hardness of 90 or less in JIS K 6253 Shore A can be used. As the soft resin, the soft resin exemplified in the description of the first soft resin 22 can be used.

The second soft resin 27 may be made of a soft resin different from the first soft resin 22 according to 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. [ 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.

The same kind of soft resin may be used as the first and second soft resin 22, 27. Accordingly, it is possible to reduce the number of types of soft resin used in manufacturing the toothbrush 10.

8, the outer shape of the cut surface of the soft portion 26 is circular, 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 the elliptical cut surface 25-1a shown in Fig. 8 is used, the outer shape of the cut surface of the soft portion 26 is, for example, An elliptical image that coincides with the long axis of the recording medium 25-1a or the above-described elliptical image may be used. When the cut surface 25-1a is an elliptical shape, a rectangular shape, or a polygonal shape, 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.

1 to 6, the handle portion 16 includes a second portion 25-2 (a portion of the core portion 25) constituting the core portion 25 and a plurality of projections A ring-shaped depressed portion 32, a first rib portion 34, and a second rib portion 35 And a third rib portion 37, as shown in Fig.

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

In Figs. 9 and 10, the same components as those of the structures shown in Figs. 1 to 6 are denoted by the same reference numerals. 9 and 10 show the reference numerals of the handle portion 16 for convenience of explanation. 9 and 10, reference numerals of constituent elements of the toothbrush 10 other than the components of the handle portion 16 are also shown for convenience of explanation.

Referring to Figs. 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. The hard resin constituting the second portion 25-2 may be the same as the hard resin constituting the first portion 25-1, for example.

The second portion 25-2 is formed such that the cross-sectional shape orthogonal to the X-direction is continuously enlarged as it extends from one end of the second portion 25-2 toward the plurality of columnar projections 29 in the X direction It is composed of a boss type. That is, the portion of the second portion 25-2 where the plurality of protruding portions 29 are formed has the largest diameter.

The portion of the second portion 25-2 located on the rear end side of the handle portion 16 than the plurality of the projecting portions 29 faces the rear end side of the handle portion 16 from the plurality of projecting portions 29 The cross-sectional shape perpendicular to the X direction is a top shape in which the diameter is continuously reduced.

The shape of the portion of the second portion 25-2 disposed on the rear end side of the handle portion 16 is larger than the shape of the rear end side of the handle portion 16 from the plurality of projecting portions 29 In the case where the same soft resin is used as the first and second soft resin 22 and 27, for example, as shown in Fig. 12, which will be described later, the second mold When the soft resin is introduced into the second metal mold 51 from the rear end side of the second metal mold 51 after arranging the hard member 17 in the direction of the front end of the head portion 14 The soft resin can easily move (flow) with the soft resin 17 so that the entire hard member 17 (except for the molding surface 21-1b and the plurality of the hair removal holes 21-1B) .

Further, when the soft resin is introduced into the second metal mold 51 as described later, the introduced soft resin suppresses the change in the position and attitude of the hard member 17 in the second metal mold 51 can do.

As shown in Fig. 2, it is preferable that the second portion 25-2 is recessed at the tip end portion of the handle portion 16, but the present invention is not limited to this. The second portion 25-2 may be placed on the neck portion 15, for example.

In the case of the present embodiment, four protruding portions 29 are formed as an example. The four protrusions 29 are arranged in the circumferential direction of the thickest portion of the second portion 25-2.

The angle formed by the two projecting portions 29 disposed at the neighboring positions can be, for example, 90 degrees. The space formed between the two protruding portions 29 arranged at the neighboring positions functions as a path for introducing the soft resin into the second mold 51 shown in Fig. The soft resin is supplied to the tip side of the head portion 21 through the space to be hardened (cured) to become the first soft resin 22.

The plurality of projections 29 each have a projecting surface 29a. The projecting surfaces 29a of the plurality of protruding portions 29 are exposed from the outer surface of the handle body 31 (in other words, the outer surface of the handle portion 16), and the outer surface of the handle portion main body 31 16), as shown in Fig.

As shown in Figs. 1, 2 and 10, the protruding portion 29 serving as the first protruding portion located on the + Z side passes through the opening 31a of the handle portion 31 (soft portion 26) -1b side. The protruding portion 29 serving as the second projection located on the -Z side is exposed on the side opposite to the molding 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 on the + Y side through the opening 31c of the handle portion 31 (soft portion 26). The protruding portion 29 located on the -Y side is exposed on 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 of the handle portion 16 has a tapered portion 31A that tapers toward the tip side, and the openings 31a to 31d are tapered portions 31A. In other words, the projecting 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, the cross-sectional shape of the projecting surface 29a is an arc shape in that the cross-sectional shape of the outer surface of the handle portion 16 is substantially circular. Therefore, the protruded surfaces 29a are exposed in a radially outward direction, and are exposed in a direction perpendicular to the longitudinal direction and the radial direction of the toothbrush 10. Specifically, for example, in FIG. 10, the protruding surface 29a of the protruding portion 29 serving as the first protruding portion located on the + Z side faces the + Z side and is exposed on the + Y side and -Y As shown in FIG. 10, the protruding surface 29a of the protruding portion 29 serving as the second protruding portion located on the -Z side is exposed on the -Z side, and on the + Y side and the -Y side And exposed.

The plurality of protruding portions 29 are formed by arranging the hard member 17 in the space 53 of the second metal mold 51 by using the second metal mold 51 The protruding surface 29a comes into contact with the inner surface of the second mold 51 to maintain the posture of the rigid member 17 in the space together with the two support portions 21-12 constituting the base member 21 (The details will be described later). The four protruding portions 29 are brought into contact with the inner surface of the second metal mold 51 so that the protruding surface 29a comes into contact with the inner circumferential surface of the rigid member 17 As shown in Fig.

The amount of protrusion of the plurality of protruding portions 29 is the same as the thickness of the second soft resin 27 disposed around the plurality of protruding portions 29. Therefore, the amount of protrusion of the plurality of protruding portions 29 is set to a value that becomes a surface with the surface of the second soft resin 27 in accordance with a desired thickness of the second soft resin 27 disposed around the plurality of protruding portions 29 Can be appropriately set.

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

1 to 6 and 10 illustrate the case where four protrusions 29 are provided as an example of the plurality of protrusions 29. However, the number of the protrusions 29 may be limited to four It does not.

For example, the number of the plurality of projections 29 may be three, for example, in such a manner that the angle formed by the projections 29 arranged at the adjacent positions is 120 °, It may be eight or less.

The shape of the plurality of protruding portions 29 may be a shape having a flow path capable of flowing the soft resin from the rear end side of the plurality of protruding portions 29 to the front end side of the base member 21, And the shape of the projection 29 shown in Fig. 10 are not limited to the cylindrical shape. The cross-sectional shape of the plurality of columnar projecting portions 29 may be, for example, a star shape or a heart shape having excellent design properties.

1 to 3, the handle body 31 is a portion of the toothbrush 10 held by the user's hand, and is formed of the second soft resin 27.

The handle body 31 is made of the second soft resin 27 so that the toothbrush 10 can be moved from the rear end of the toothbrush 10 to the mouth of the toothbrush 10 in the direction toward the tip of the head 14, The handle portion main body 31 can be deformed (specifically, bent).

As a result, not only the neck portion 15 but also the handle portion main body 31 are bent so that the external force directed toward the tip end of the head portion 14 can flow out from the rear end of the toothbrush 10 in a different direction. It is possible to inhibit damage to the mouth of the user.

In addition, when the second soft resin 27 is used to constitute the handle portion main body 31, even when a strong force is applied to the handle portion main body 31, the handle portion 16 is broken (in other words, (The folded portion 16 is folded) can be suppressed.

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 depressed portion 32-1 is disposed on the rear end side of the handle portion 16 rather than the second portion 25-2. The ring-shaped depressed portion 32-1 is formed by reducing the diameter of the handle portion main body 31. [ That is, the ring-shaped depressed portion 32-1 has a cross-sectional shape orthogonal to the X direction, a top shape similar to the handle portion main body 31, and a shape in which the diameter continuously decreases.

The ring-shaped depressed portion 32-2 is arranged at a rear end side of the handle portion 16, for example, 20 mm to 50 mm away from the ring-shaped depressed portion 32-1. The ring-shaped depressed portion 32-2 is formed by reducing the diameter of the handle portion main body 31. [ That is, the ring-shaped depressed portion 32-2 has a cross-sectional shape orthogonal to the X-direction, a top shape similar to the handle portion main body 31, and a shape in which the diameter continuously decreases.

By arranging the ring-shaped depressions 32-1 and 32-2 formed by shrinking the diameter of the handle portion main body 31 in the X direction of the handle portion main body 31 as described above, 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, at the arrangement position of the ring-shaped depressed portions 32-1 and 32-2 as the second deformed 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 front end of the head portion 14 can flow out in a different direction more efficiently, so that the mouth of the user of the toothbrush 10 can be prevented from further damage .

When the user uses the toothbrush 10 by arranging the ring shaped depressions 32-1 and 32-2 formed by shrinking the diameter of the handle portion main body 31 in the X direction of the handle portion main body 31, So that the operability of the toothbrush 10 can be improved.

1 to 3, two ring-shaped depressions 32-1 and 32-2 are formed on the handle body 31. However, the ring-shaped depressions 32-1, 32-2 are 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 than five, if necessary.

The arrangement positions of the ring shaped depressions 32-1 and 32-2 may be formed in the handle portion main body 31 located behind the arrangement position of the second portion 25-2, The shape of the ring-shaped depressions 32-1 and 32-2 shown in Fig.

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

A plurality of second rib portions 35 are disposed in portions of the ring-shaped depressed portion 32-2 that constitute the side surface of the handle portion main body 31 (in other words, two side surfaces).

A plurality of third rib portions 37 are disposed on a side surface (that is, two side surfaces) of the handle portion main body 31 located on the rear end side of the arrangement position of the second rib portions 35. [

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

In addition, the first to third rib portions 34, 35, 37 are not necessarily required and may be omitted.

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 ring- The finger holding the toothbrush 10 is prevented from slipping by having the plurality of third rib portions 37 disposed on the side of the handle portion main body 31 located at the rear end side of the arrangement position of the rib portions 35 Therefore, the grip performance of the handle portion main body 31 can be improved.

Referring to FIG. 1, the brush part 12 is formed of a pair of legs 12 - 1 laid on a plurality of footholes 21 - 1 B formed in a base member 21. Moda (12-1) is a bundle of plural hairs.

The length (mother hair length) of the hair bundle 12-1 when the hair styling face 21-1b is taken as a reference can be determined in consideration of the hair elasticity required for the hair bundle 12-1. Specifically, the length (parent length) of the bundle 12-1 can be appropriately set within a range of, for example, 6 to 13 mm.

The mother board 12-1 may be constituted by a plurality of pieces having the same mother length, for example, or may be formed of a plurality of pieces having different mother lengths.

In FIG. 1, for example, the tip ends of the plurality of hair bundles 12-1 constituting the brush portion 12 are aligned as an example of the brush portion 12 constituting the toothbrush 10, It is not limited.

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

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

All of the female threads 12-1 may be the same thread diameter or different from each other.

As a plurality of features constituting the mother board 12-1, for example, a tapered mother board whose diameter is reduced toward the mother end and whose mother end is sharpened, a mother board 21-1b, A straight hair or the like which is roughly equal in diameter toward the center can be used.

As the straight hair, for example, one having a flat end substantially parallel to the feeding end 21-1b, or a hair end having a hemispherical shape may be used.

Examples of the material constituting the mold bundle 12-1 are polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate Polyesters such as phthalate (PTT), polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN), polyolefins such as PP, and the like.

The above-mentioned resin materials which are the materials of the appearance may be used singly or in combination of two or more kinds.

As the outline constituting the female thread 12-1, for example, a polyester-made hologram having a multi-centered structure having a core portion and at least one layered outer portion formed on the outer side of the core portion may be used.

The shape of the cross section of the appearance of the mold bundle 12-1 is not particularly limited, and for example, circular, elliptical, circular, polygonal, star-shaped, three-leaf clover type, four-leaf clover type and the like can be used.

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

The thickness of the features constituting the pattern (12-1) can be determined in consideration of the material of the above-mentioned features. When the cross-section of the appearance is circular, the thickness of the above-mentioned features may be, for example, 6 to 9 mils. Also, 1 mil is 0.0254 mm.

Further, the female thread 12-1 may be constituted by arbitrarily combining a plurality of appearances having different thicknesses in consideration of feeling of use, chain sawing, cleaning effect, durability and the like.

According to the toothbrush of the present embodiment, the head portion 14 having at least the distal end portion thereof composed of the first soft resin 22 and having the wedge surface 21-1b, and the handle portion main body 31 And a neck portion 15 connecting the head portion 14 and the handle portion 16. The neck portion 15 has a neck portion 15 extending in the X direction A soft portion 25 made of a hard resin harder than the first soft resin 22 and a second soft resin 27 accommodating the core portion 25 and tighter than the hard resin, When the user applies a strong external force to the toothbrush 10 in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 in the state where the toothbrush 10 is in the door state, It is possible to allow the force applied to the tip of the head portion 14 to flow out by deforming (specifically bending) the neck portion 15 and the handle portion 16 as constituent elements And, at the same time, it has a light first soft resin 22 is disposed on the front end of the head portion 14 may therefore be possible to contact the user within the oral cavity to inhibit the damage to the user's oral cavity I of the toothbrush 10.

Particularly, when the user of the toothbrush 10 is a child of 1 to 3 years old, the toothbrush 10 may be run in a state of being kept in the mouth. In such a case, even when the infant turns on, It is possible to suppress damage.

In the present embodiment, the case where the hard member 17 having the base member 21, the core 25, and the plurality of projections 29 is used as a component of the toothbrush 10 has been described as an example, A toothbrush (hereinafter referred to as " toothbrush Q " for convenience of explanation) may be constructed by using a hard member (hereinafter referred to as " hard member P " In this case, the same effect as that of the toothbrush 10 of the present embodiment can be obtained.

In this case, the rigid member P may have a plurality of protruding portions 29 only on the rear end side of the deep portion 25, and may have a plurality of protruding portions 29 on the distal end side of the deep portion 25.

With this configuration, when a soft resin (a resin that becomes the first and second soft resin 22 and 27) is introduced into a mold (not shown) having a space corresponding to the contour of the toothbrush Q, The posture (position) of the member P can be maintained, and the toothbrush Q can be manufactured with high precision.

In addition, when the toothbrush Q is manufactured (concretely, when the hair bundle is to be implanted), the in-mold method may be used.

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

In Figs. 11 and 12, the same components as those of the structures shown in Figs. 1 to 10 are denoted by the same reference numerals. 11 shows the direction in which the hard resin is introduced, and the arrows in Fig. 12 show the direction in which the soft resin (soft resin N described later) is introduced.

Next, a method of manufacturing the toothbrush 10 of the present embodiment will be mainly described with reference to Figs. 1, 11, and 12. Fig.

Hereinafter, the following description will be made of 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.

11, a hard resin is introduced into the space 43 and the space 43 corresponding to the shape of the hard member 17, A first mold 41 having an introduction port 45 is prepared.

The mold 41-2 is formed with a projection (not shown) for forming a plurality of hair-removal holes 21-1B. Further, the introduction port 45 is disposed on the rear end side of the space 43.

Subsequently, the space 43 is filled with a molten hard resin (resin having a flexural modulus (JIS K7203) within a range of 500 to 3000 MPa) serving as a base material of the rigid member 17 via the introduction port 45, The hard resin is hardened to harden the hard member (the base member 21, the core portion 25, and the plurality of projections 29) including the plurality of hair-removal holes 21-1B and the support portions 21-2 17 are formed. Thereafter, the hard member 17 is taken out of the first mold 41. [

12, a space 53 corresponding to the shape of the toothbrush 10 except for the brush portion 12 shown in Fig. 1, and a pair of metal molds 51-1 and 51-2, A second mold 55 having an introduction port 55 for introducing the hard resin into the space 53 is prepared. The joint surfaces of the pair of dies 51-1 and 51-2 are set at, for example, intermediate positions in the Z direction of the soft portion 26 (the handle portion main body 31) shown in Figs. 8 to 10 have.

The mold 51-2 is formed with a projection (not shown) for forming a plurality of hair-removal holes 21-1B. Further, the introduction port 55 is disposed on the rear end side of the space 53.

The second metal mold 51 is provided with the ring shaped depressions 32-1 and 32-2, the first rib portion 34, the second rib portion 35 and the third rib portion 37 Are formed on the outer circumferential surface.

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

The first soft resin 22 and the second soft resin 27 (the soft resin constituting the soft portion 26 and the handle portion main body 31) in the space 53 of the second metal mold 51 The position and posture of the hard member 17 in the second metal mold 51 can be maintained when the soft resin N is introduced.

That is, the protruding surface 29a of the protruding portion 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 protruding portion 29 located on the- 51-1 so that the hard member 17 is positioned in the Z direction. The projecting surfaces 29a of the projections 29 located on the + Z side and the projecting surfaces 29a of the projections 29 located on the -Z side face each other on the + Y side and the -Y side, , And is also positioned with respect to the Y direction by contacting the inner surface of the mold 51-2.

The end surfaces of the two support portions 21-2 and the protruding surfaces 29a of the plurality of protruding portions 29 come into contact with the inner surface of the second mold 51 so that the 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 ensured.

Then, the soft resin N (JIS K 7215 Shore A hardness of 90 or less) is melted in the space 53 through the introduction port 55.

Since the inner surfaces of the mold 51-1 and the mold 51-2 at the positions corresponding to the tapered portions 31A are shortened in distance from each other in such a manner that the inner surfaces of the mold 51-1 and the mold 51-2 become thinner toward the tip side, The rigid member 17 is prevented from moving toward the tip end. The hard member 17 is positioned without moving in the X direction even if the resin pressure of the molten soft resin N charged through the introduction port 55 is applied.

Thereafter, the soft resin N is cured to form the first soft resin 22, the soft portion 26, and the handle portion main body 31. A dividing line of a microprojection tank is formed on the surface of the soft portion 26 at a position (a substantially middle position in the Z direction) opposite to the bonding surface of the mold 51-1 and the mold 51-2.

Thus, 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 inside of the second mold 51.

Next, as shown in Fig. 1, the hair bundle 12-1 is stitched on the plurality of hair-removal holes 21-2 of the head 11. Thus, the toothbrush 10 of the present embodiment shown in Fig. 1 is manufactured.

As a method for forming the mold bundle 12, for example, a method of folding the mold bundle 12-1 in two layers and then forming a flat line (a metal (for example, brass) in the inside of the mold bundle 12-1 Flat plate molding method in which a hair bundle 12-1 with a flat line is stitched on a hair-removal hole 21-2 can be used.

In the present embodiment, a flat sheet molding method is used as a method of molding the bundle 12-1. However, instead of this method, for example, a resin A method in which a lower end of the mold bundle 12-1 is fixed by press-fitting and fixing the lower end of the mold bundle 12-1 in a resin or a hard resin, or a method in which a lower end of the mold bundle 12-1 is heated to form a molten mass, Or the like may be used.

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to these specific embodiments, and various modifications and changes may be made within the scope of the present invention described in the claims.

For example, in the above-described embodiment, the soft portion 26 is formed at the tip end of the head portion 14, but the present invention is not limited thereto. As shown in the side view of Fig. 13 and the front view of Fig. 14, The deformed portion 15A of the deformable portion 15A and the soft portion 26 may be formed on the rear end side of the deformable portion 15A.

Further, the present invention is widely applicable to a toothbrush having one modal, that is, a so-called one-touch toothbrush, and a toothbrush having a tear removing portion.

The width of the neck portion 21 in the second direction (Y direction) is smaller than that of the head portion 14 (the maximum width in the Y direction) between the kneading surface 21-1b and the handle portion 16 The width of the head portion 14 in the Y direction between the kneading surface 21-1b and the handle portion 16 is not limited to this configuration, The toothbrush of the present invention is also included in the present invention. In this case, the deformed portion is disposed as a neck portion at the corresponding portion, and at least a portion of the rigid member is accommodated in the rear end side from the deformed portion, and a soft portion formed of a soft resin is disposed.

INDUSTRIAL APPLICABILITY The present invention can be applied to a toothbrush capable of restraining damage to the user's mouth.

10: toothbrush 11: handle
12: Brush part 14: Head part
15: neck portion 15A:
16: handle portion 17: hard member
21: base member 21-1: base member body
21-1a: bottom surface 21-1A:
21-1b: Expression main surface (first exposed portion) 21-1B:
21-2: Support portion 21-2a:
22: first soft resin 25: deep portion
25-1: First part 25-1a:
25-2: first part 26: soft part
27: second soft resin 29: protrusion
29a: protruding surface 31: handle body
31A:
32-1, 32-2: ring-shaped depressed portion (second modified 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: second width

Claims (14)

A head portion having a wedge-shaped surface on the leading end side,
And a handle portion disposed at a rear end side of the head portion and including a handle portion main body,
A deformation portion which is disposed between the cooking cavity surface and the handle portion and deforms by an external force to the head portion,
A rigid member which is arranged from the head portion to a part of a front end side of the handle portion and is made of a hard resin,
And a soft portion that is disposed from the deformation portion to the rear end side to receive at least a portion of the hard member therein and is also formed of a soft resin. The method according to claim 1,
And a second deforming portion disposed on the handle portion and deformed by the external force. 3. The method of claim 2,
Wherein the handle portion has at least one reduced-diameter depressed ring portion with respect to the extending direction of the handle portion,
And the second deforming portion is disposed at an arrangement position of the depressed portion. 4. The method according to any one of claims 1 to 3,
Wherein the hard member has a first exposed portion that is exposed on the cooking cavity side of the head portion and a second exposed portion that is exposed on the opposite side of the cooking cavity. 5. The method according to any one of claims 1 to 4,
The rigid member has a columnar first projection projecting from the handle portion and projecting toward the cup face and a columnar second projection projecting from the handle portion in a direction opposite to the cup face Features a toothbrush. 6. The method of claim 5,
Wherein the first projecting portion exposes through a first opening formed on the convex side of the soft portion,
Wherein the second protrusion is exposed through a second opening formed on the opposite side of the softened portion of the soft portion. The method according to claim 6,
Wherein the soft portion of the handle portion has a tapered portion that tapers toward the tip side,
Wherein the first opening and the second opening are formed in the tapered portion. 8. The method according to any one of claims 5 to 7,
Wherein the soft portion has a dividing line on the surface,
The first projection is exposed on one side in a direction orthogonal to the molding surface with the dividing line interposed therebetween,
And the second projection is exposed to the other side in the orthogonal direction with the dividing line interposed therebetween. 9. The method according to any one of claims 5 to 8,
The hard member is arranged to extend to the handle portion,
Wherein the distal end surface of the first protrusion and the distal end surface of the second protrusion are flush with the outer surface of the handle portion. 10. The method according to any one of claims 5 to 9,
Wherein the portion of the rigid member which is disposed on the rear end side of the handle portion is smaller in diameter as it goes toward the rear end side of the handle portion than the first projecting portion and the second projecting portion. 11. The method according to any one of claims 1 to 10,
Wherein the head portion is made of a first soft resin having at least a tip portion thereof tighter than the hard resin,
Wherein the handle portion main body is made of a second soft resin that is tighter than the hard resin,
And the soft portion is made of the second soft resin. 12. The method according to any one of claims 1 to 11,
Wherein the rigid member between the cooking cavity and the handle portion has a first width in a first direction orthogonal to the cooking cavity and a second width in a second direction perpendicular to the first direction Is greater than the second width of the toothbrush. 13. The method according to any one of claims 1 to 12,
Wherein the hard member in the head portion includes a base member having the eating core and the plurality of hair-removal holes,
Wherein the first soft resin is disposed so as to cover a part of the base member in a state in which the eating core and the plurality of hair-removal holes are exposed. 14. The method according to any one of claims 1 to 13,
Wherein a neck portion is disposed between the mouthpiece and the handle portion, the neck portion having a width in a first direction orthogonal to the eating surface and a width in a second direction orthogonal to the length direction of the handle portion is less than or equal to a width of the head portion.

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