KR20200051640A - toothbrush - Google Patents

Abstract

An object of the present invention is to provide a toothbrush in which good operability is obtained in the oral cavity of a child. A handle body (11) comprising a plurality of hair bundles (7), a head portion (2) provided with a head portion (2), a neck portion (3), and a handle portion (4) provided with the head portion (2) 5) is provided. Viewed from the front, the length of the neck portion is 15 mm or more and 35 mm or less, the total length of the head portion and the neck portion is 28 mm or more and 68 mm or less, and the width of the neck portion is 4 mm or more and 6 mm or less, and viewed from the side, the head The thickness of the portion is 2 mm or more and 4 mm or less, and as viewed from the front, the distance between the first position located at the boundary of the neck portion and the head portion and 20 mm from the first position to the handle portion side, and the position of the ridge line of the finger contact portion 4 mm or more and 22 mm or less, and the difference between the second position and the position of the ridge line of the finger contact portion is 3 mm or more and 9 mm or less.

Description

toothbrush

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application No. 2017-175906 for which it applied to Japan on September 13, 2017, and uses the content in this specification.

To prevent tooth decay and periodontal disease, it is important to remove plaque in the oral cavity by brushing with a toothbrush. Conventionally, various toothbrushes have been proposed to enhance the effect of removing plaques. For example, by thinning the head portion of the toothbrush and making the neck portion thinner, it is possible to reach the inside of the molars (the throat side of the molars) difficult to reach with a conventional toothbrush. Patent Literature 1 discloses a toothbrush with a thin head portion and excellent operability in the oral cavity.

Japanese Patent No. 3387591

On the other hand, for children's toothbrushes, first of all, it is required to have a plaque removal effect and a child unfamiliar with brushing safely and safely. However, the technology development of a child's toothbrush for the purpose of improving the operability of the toothbrush in the oral cavity has not progressed like an adult toothbrush.

The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a toothbrush having good operability in a child's mouth.

The toothbrush in this invention is provided with the handle part which has the hair part which has a some hair bundle, and the head part provided with the said hair part on the hair surface, the neck part, and the handle part, and seeing from the front, the neck part The length is 15 mm or more and 35 mm or less, the total length of the head portion and the neck portion is 28 mm or more and 68 mm or less, the width of the neck portion is 4 mm or more and 6 mm or less, and as viewed from the side, the thickness of the head portion is 2 mm or more and 4 mm or less, and seen from the front, the distance between the second position moved 20 mm from the first position located at the boundary of the neck portion and the head portion toward the handle portion, and the position of the ridge line of the finger contact portion 4 mm or more and 22 mm or less, and the difference between the second position and the position of the ridge line of the finger contact portion is 3 mm or more and 9 mm or less.

In the toothbrush of the present invention, as the relationship between the width of the neck portion viewed from the front side and the thickness of the neck portion viewed from the side faces toward the rear end in the section from the first position to the second position, It is good also considering a structure in which the amount of change in the thickness rather than the width is always equal or more.

In the toothbrush of this invention, you may make it the structure in which the relationship between the width and thickness of the neck part is reversed from the said 1st position to a 2nd position.

In the toothbrush of the present invention, the surface of the neck surface side of the neck portion is a first point at the center of the thickness of the tip of the head portion viewed from the side surface, and a side surface at a central position in the longitudinal direction of the handle portion viewed from the front side. It may be configured to form a straight line along a straight line connecting the second point that is the center of the thickness as seen from.

In the toothbrush of the present invention, the surface of the neck surface side of the neck portion has a first point at the center of the thickness of the tip of the head portion viewed from the side surface, and a center of the thickness of the rear end of the handle portion viewed from the side surface. It may be configured to form a straight line along a straight line connecting the third points.

In the toothbrush of the present invention, the handle body, the first finger contact portion that is convex toward the bristle surface side, and the second finger touch that is convex toward the back side opposite to the bristle surface, near the neck portion of the handle portion As seen from the side, the first finger contact portion includes a first curved surface having a center of curvature on the neck portion side of the bristle surface side, and a second curved surface having a center of curvature on the handle portion side of the bristle surface side. It is formed on the crossing portion, the second finger touch portion, as viewed from the side, a fourth curved surface having a center of curvature on the neck portion side of the chamfered surface, and the center of curvature on the handle portion side of the back side It is good also as a structure formed in the part where 5 curved surfaces intersect.

In the toothbrush of the present invention, the first finger contact portion has a shape in which a first ridge line formed at an intersection of the first curved surface and the second curved surface is convexly curved toward the neck portion when viewed from the front side. The second finger contact portion may have a configuration in which a second ridge line formed at an intersection of the fourth curved surface and the fifth curved surface is convexly curved toward the neck portion as viewed from the rear surface. .

In the toothbrush of the present invention, as viewed from the front, the width in the longitudinal direction of the neck portion may be a constant configuration.

In the toothbrush of this invention, you may make it the structure which the material of the said handle body is polypropylene resin.

In the toothbrush of this invention, you may make it the structure which at least one part of the said handle body was covered with soft resin.

In the toothbrush of the present invention, the overall length of the handle body may be 110 mm or more and 170 mm or less.

ADVANTAGE OF THE INVENTION According to this invention, the toothbrush which can obtain favorable operability in the oral cavity of a child can be provided.

1 is a perspective view showing the overall configuration of the toothbrush 1 of this embodiment.
2 is a front view showing the overall configuration of the toothbrush 1 of this embodiment.
3A is a side view showing the overall configuration of the toothbrush 1 of this embodiment.
Figure 3b is a side view showing an enlarged main part of Figure 3a.
4 is a rear view showing the overall configuration of the toothbrush 1 of this embodiment.

Hereinafter, the toothbrush of embodiment of this invention is demonstrated.

Incidentally, in each of the following drawings, in order to make each component easier to see, the scales of dimensions may be different by components.

First, the toothbrush 1 of this invention is demonstrated.

1 is a perspective view showing the overall configuration of the toothbrush 1 of the present embodiment. 2 is a front view showing the entire configuration of the toothbrush 1 of the present embodiment, as viewed from the front. 3A and 3B are side views seen from the side showing the overall configuration of the toothbrush 1 of this embodiment. 4 is a rear view as viewed from the rear showing the overall configuration of the toothbrush 1 of the present embodiment.

Here, the upper surface of the head part 2 provided with the bristle part 11 is called a bristle surface 2a. As shown in Fig. 3A, the virtual plane K constituting the planting surface 2a is a horizontal XY plane, the direction in which the handle body 5 extends as a whole is the X-axis direction, and the X-axis The orthogonal direction is the Y-axis direction. The normal direction of the planting surface 2a is set to the Z-axis direction. In the following description, the dimension in the Y-axis direction of each member is called the width of the member, the dimension in the Z-axis direction of each member is called the thickness of the member, and the dimension in the X-axis direction of each member is the length of the member It is called.

The "view from the front" in FIG. 2 is a view of the toothbrush 1 seen from the + Z axis direction. 3A and 3B are views of the toothbrush 1 viewed in the -Y axis direction. The "view from the back" in Fig. 4 is a view of the toothbrush 1 seen from the -Z direction when the back surface 2b on the opposite side from the planting surface 2a is viewed.

(Toothbrush (1))

As shown in Fig. 1, the toothbrush 1 of the present embodiment has a head portion 2 provided with a head portion 11, a head portion 2 provided with a head portion 11, and a neck extending from the base end side of the head portion 2 A portion 3 and a handle portion 4 extending from the base end side of the neck portion 3 are provided. That is, the head portion 2, the neck portion 3 and the handle portion 4 are integrally formed. Hereinafter, the portion where the head portion 2, the neck portion 3 and the handle portion 4 are integrated is referred to as a handle body 5.

(Handle (5))

The handle body 5 is integrally molded into a long shape as a whole, and can be produced, for example, by injection molding using a resin as a material. As a constituent material of the handle body 5, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly cyclohexylenedimethylene terephthalate (PCT), polyacetal (POM), Polyethylene naphthalate (PEN), polystyrene (PS), acrylonitrile-butadiene-styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile-styrene copolymer resin (AS ) And the like. Among these resin materials, it is preferable to use materials such as POM, PBT, and PEN from the viewpoint of high strength and easy thinning of the head portion.

In particular, polypropylene, compared to resins such as polyacetal, generally has high versatility, is easy to process and low in cost, while has a property of low flexural modulus. For example, the bending elastic modulus of polyacetal (JIS K7171) is about 2500 MPa, while the bending elastic modulus of polypropylene is about 1500 to 2000 MPa. Therefore, in the related art, as the material of the toothbrush having a thin head portion and a thin neck portion, polypropylene was a material that is difficult to use.

By the way, by adopting the shape of the toothbrush of the present embodiment described later, a resin having a relatively low bending elastic modulus such as polypropylene can also be used.

In the present embodiment, the bending elastic modulus (JIS K7171) of the constituent material of the handle body 5, particularly the neck portion 3, is preferably 1000 MPa or more and 2800 MPa or less, more preferably 1200 MPa or more and 2500 MPa or less, and more preferably 1500 MPa or more and 2000 MPa or less. It is more preferable.

The resin may be used alone or in combination of two or more resins. In addition, the handle body 5 may be partially or entirely covered with a soft resin. When a part or all of the handle part 4 is covered with a soft resin, the feeling of hand fitting when the user grips the handle part 4 is improved, and it is possible to prevent the gripping finger from slipping. As the soft resin, for example, a resin of Shore A90 or less is preferable, and a resin of Shore A10 to 40 is more preferable. Examples of such soft resins include elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, polyester-based elastomers, and polyurethane-based thermoplastic elastomers, silicones, and the like. In the case of using a flexible resin such as an elastomer, for example, from the viewpoint of improving adhesiveness, polyolefin is preferred, and polypropylene is more preferred.

The toothbrush 1 of this embodiment is comprised, for example, assuming the toothbrush used by children 3 to 9 years old. As shown in Fig. 2, the overall length L5 of the handle body 5 can be determined in consideration of the user's operability and the like. The total length L5 of the handle body 5 is, for example, about 110 mm to 170 mm.

(Head part (2))

As shown in Fig. 3A, the head portion 2 extends from the flat plate portion 2A having the chamfered surfaces 2a and the rear surface 2b parallel to each other in the thickness direction, and from one end side of the flat plate portion 2A. It has an extension part 2B.

As shown in Fig. 2, the head portion 2 has a longer longitudinal direction of the handle body 5, and the top portion is curved and has a corner-shaped flat plate as viewed from the front. A plurality of bristle holes 2h are formed on the bristle surface 2a of the head portion 2. The hair bundle 7 (FIG. 1) in which the bristles are tied is planted in this planting hole 2h, and a bristle part 11 (FIG. 1) including a plurality of hair bundles is formed.

The head portion 2 is seen from the front, widens outward in the width direction as it faces the neck portion 3 from the tip end of the head portion 2, and then extends in an equal width, and then narrows inward in the width direction, and the neck It has a shape reaching the boundary (first position S1) with the part 3. The length (head length) L2 shown in FIG. 2 represents the length from the tip end of the head portion 2 to the first position S1, which is a boundary with the neck portion 3.

In this embodiment, the 1st position S1 is the end point of the curve which forms the corner cut from the neck part 3 in the shape seen from the front of the head part 2, ie, the curve which forms a corner cut. It is the position where the bending direction of the is changed. That is, the first position S1, which is the boundary between the head portion 2 and the neck portion 3, shows both edges where the width of the corner cut portion near the neck portion 3 in the head portion 2 seen from the front is narrowed. It is a position that changes from a curved line or a straight line to be formed to a curved line or a straight line with a wider width or a straight line with the same width.

In addition, in the case of a toothbrush having a wider width as the neck portion 3 faces the handle portion 4 when viewed from the front, the first position S1 is in the head portion 2 and the neck portion 3 when viewed from the front. Match the smallest position of.

The dimensions of the head portion 2 are determined in consideration of characteristics such as operability in the oral cavity.

When the length L2 of the head portion 2 is too long, the operability in the oral cavity is liable to be damaged, and if too short, the number of hair bundles 7 (FIG. 1) to be planted is too small, and the cleaning effect is liable to be impaired. For this reason, it is preferable that the length L2 of the head part 2 is 13 mm-35 mm, for example. In addition, in FIG. 2 and FIG. 3A, illustration of the bristle part 11 is abbreviate | omitted.

As shown in Fig. 2, when the width (head width) W2 of the head portion 2 in the direction crossing in the longitudinal direction of the handle body 5 is too large, operability in the oral cavity decreases, and if it is too small, The number of hair bundles 7 to be planted is too small, and the cleaning effect is liable to be impaired. For this reason, the width W2 of the head portion 2 is preferably 5 mm to 13 mm, for example.

As shown in Fig. 3A, the thinner the head 2, the higher the operability in the oral cavity, but if it is too thin, the strength of the head 2 is likely to be insufficient. For this reason, the thickness (head thickness) T2 of the head portion 2 can be determined in consideration of the constituent materials of the handle body 5, the bending elastic modulus, and the like. The thickness T2 of the head portion 2 is preferably 2.0 mm or more and 4.0 mm or less, and more preferably 2.5 mm or more and 3.5 mm or less.

As shown in Fig. 2, the shape of the planting hole 2h is not particularly limited, and may be a circular shape such as a circle or an ellipse, or a polygon such as a triangle or a square. The number of the bristle holes 2h is not particularly limited, and is preferably about 10 to 60, for example. In this embodiment, as an example, the row at the front end side has two holes arranged in the width direction, the second row from the front end side has three holes, and the row at the rear end side has three holes. In the central portion, four rows of holes are formed side by side.

The diameter of the planting hole 2h is determined according to the thickness of the hair bundle 7 shown in Fig. 1, and is preferably 1 mm to 3 mm, for example. The arrangement pattern of the bristle hole 2h is not particularly limited, and may be any arrangement pattern such as a so-called lattice shape or a zigzag shape.

Examples of the hairs constituting the hair bundle 7 include hairs (taper hairs) whose diameter gradually decreases toward the hair tips, and hairs (straight hairs) having substantially the same outer diameter except for the rounding part of the hair tips. The material of the appearance is, for example, polyamide such as 6-12 nylon, 6-10 nylon, polyester such as PET, PBT, polytrimethylene terephthalate (PTT), PEN, polybutylene naphthalate (PBN), Synthetic resin materials such as polyolefins such as PP, olefin-based elastomers, and styrene-based elastomers can be used. These resin materials may be used alone or in combination of two or more. Further, the feature may be a multi-core structure having a core portion and at least one or more sheath portions provided outside the core portion.

The cross-sectional contour of the feature is not particularly limited, and examples thereof include circular, triangular, quadrangular, pentagonal, hexagonal, and other polygonal, star, three-leaf clover, and four-leaf clover shapes.

The thickness of the appearance is not particularly limited, and when the cross-sectional contour is circular, for example, 3 mil to 11 mil (1 mil = 1/1000 inch = 0.025 mm). The hair bundles may all be composed of the same-sized appearance, or two or more different-sized appearances may be combined. It is preferable that the hair length is 6 mm to 13 mm.

(Neck part (3))

The neck portion 3 integrally connects the head portion 2 and the handle portion 4.

In the present embodiment, the neck portion 3 is extended from the first position S1 toward the handle portion 4 by extending in the same width or width as seen from the front shown in FIG. 2, and then removed from the handle portion 4 It is the length from the 3rd position S3 to further widen, ie, the length L3 from the 1st position S1 to the 3rd position S3.

The third position S3 is the position where the bending direction of the curve forming the end point of the straight line forming both edges of the same or widening portion or both edges of the widening portion is changed, as viewed from the front. to be.

The length (neck length) L3 of the neck portion 3 is preferably 15 mm or more and 35 mm or less because the neck portion 3 contacts the lips when the head portion 2 is inserted into the child's mouth, 20 It is more preferable that it is 30 mm or more.

The total length (L2 + L3) of the head portion 2 and the neck portion 3 is preferably 28 mm or more and 68 mm or less, and 30 mm or more and 65 mm or less, considering the length from the lips of the child to the molars. Is more preferable, and 33 mm or more and 61 mm or less are more preferable.

The ratio (%) of the length L3 of the neck portion 3 to the total length (full length) L5 of the handle body 5 is preferably 5.5% or more and 31% or less, and more preferably 8% or more and 24% or less. And more preferably 10% or more and 20% or less.

In the following description, the point that becomes the center of the thickness direction (Z direction) of the tip end of the head portion 2 seen from the side shown in FIG. 3A is referred to as the first point A1, and is viewed from the front shown in FIG. 2. It is the position which becomes the center of the longitudinal direction (X direction) and the width direction of this handle part 4, and the point which becomes the center of the thickness direction (Z direction) of the handle part 4 seen from the side shown in FIG. The point 2 is referred to as A2, and the point at the center of the thickness direction (Z direction) of the rear end of the handle portion 4 seen from the side shown in FIG. 3A is referred to as the third point A3.

As seen from the side shown in Fig. 3A, the neck portion 3 has a straight portion of the surface 3a on the side of the planting surface 2a. Specifically, a part of the surface 3a on the vein surface 2a side in the neck portion 3 is, for example, an imaginary straight line connecting the first point A1 and the second point A2 ( L1) to form a straight line. Alternatively, a straight line is formed along a virtual straight line L2 connecting the first point A1 and the third point A3. Alternatively, a straight line is formed along a virtual straight line L3 connecting the first point A1, the second point A2, and the third point A3.

At this time, the surface 3a of the neck portion 3 does not necessarily coincide with any of the straight lines L1, L2, L3, and is centered on the straight lines L1, L2, L3, and the thickness of the toothbrush 1 It should just be located within the allowable range set in the direction (Z direction). In the present embodiment, it is preferable that the allowable range is, for example, a range of about ± 1 mm in the thickness direction (Z direction) of the toothbrush 1 with respect to the straight lines L1, L2, and L3.

In this way, a part of the surface 3a of the neck portion 3 on the side of the bristle surface 2a may be an infant unfamiliar with brushing by having the shape along the straight line, or the handle portion 4 when brushing. The force from can be transmitted to the head surface 2a side of the head portion 2 without waste, and the operability in the oral cavity becomes good.

As shown in Fig. 3A, the surface 3a of the neck portion 3 on the chamfered surface 2a side extends toward the handle portion 4 side, and the first curved surface (1A) forming the first finger contact portion 9A ( 4a1).

Further, the back surface 3b of the neck portion 3 extends to the handle portion 4 side, and continues to the fourth curved surface 4b1 forming the second finger contact portion 9B.

[Width of the neck part 3]

As shown in Figs. 2 and 4, the neck portion 3 of this embodiment has the same width W from the first position S1 to the third position S3, but may be enlarged. By setting the width W of the neck portion 3 to be the same width, the head portion 2 can be reached even when the mouth is not opened wide when wiping the molars.

The smaller the width W of the neck portion 3, the higher the operability in the oral cavity, but if it is too small, the strength of the neck portion 3 is likely to be insufficient. For this reason, the width W of the neck portion 3 can be determined in consideration of the constituent materials of the handle body 5, the bending elastic modulus, and the like. In the present embodiment, the width W of the neck portion 3 is preferably 4.0 mm or more and 6.0 mm or less, and more preferably 4.5 mm or more and 5.5 mm or less.

[The thickness of the neck part 3]

The cross-sectional shape crossing in the longitudinal direction of the neck portion 3 is gradually changing from the head portion 2 side of the neck portion 3 toward the handle portion 4 side, as shown in Fig. 3A, and The relationship between the width and thickness of the part 3 is reversed in the longitudinal direction.

That is, if the position moved 10 mm from the first position S1 toward the handle 4 is referred to as the fourth position S4, and the position moved 20 mm from the first position S1 toward the handle 4, the second position S2, The neck portion 3 has a shape that is gradually thickened from the first position S1 to the fourth position S4 and the second position S2 and then gradually thickened as it goes toward the handle 4. In addition, the width W of the neck portion 3 is preferably as small as possible and thinner than the thickness T, and has a shape in which the cross-sectional area is increased by increasing the thickness as it goes toward the handle portion 4 side. Thereby, even if it is a thin head part 2 and a short neck part 3, it becomes a thin and strong neck part 3.

2 and 3A, in the first position S1 which is the boundary between the head portion 2 and the neck portion 3, as shown in Table 1, the first width W1 is the first in this embodiment. It is larger than the thickness T1 (W1> T1), and has a wide cross-sectional shape.

2 and 3A, in the second position S2, which is a position moved 20 mm from the first position S1 to the handle portion 4 side, as shown in Table 1, the second width is smaller than the second width W2. The thickness T2 is large (W2 <T2), and has a thick cross-sectional shape.

2 and 3A, the fourth width W4 and the fourth thickness T4 have the same shape (W4) at the fourth position S4, which is a position moved 10 mm from the first position S1 to the handle portion 4 side. = T4).

Specifically, the thickness of the first position S1 is 4 mm, the thickness of the fourth position S4 is 5 mm, and the thickness of the first position S1 is 1.25 times the thickness of the first position S1. In addition, the thickness of the second position S2 is 5.6 to 5.8 mm, and the thickness of the second position S2 is 1.12 to 1.16 times the thickness of the second position S4, and changes from the first position S1 to the fourth position S4 The thickness is changing more slowly. In this way, the thickness of the neck portion 3 increases as it goes from the head portion 2 side to the handle portion 4 side, but the ratio of increasing the thickness is not constant.

In this way, by gradually increasing the thickness from the head portion 2 side toward the handle portion 4 side in the longitudinal direction of the neck portion 3, the neck portion 3 does not bend more than necessary and does not bend at the time of brushing. (2) The power is satisfactorily transmitted, and it can be stably brushed.

In addition, by the neck portion 3 having the above-described structure, the width of the portion that touches the tip of the mouth during use becomes thinner than the thickness, so that the treatment of the toothbrush 1 in the oral cavity becomes good. In addition, since the thickness of the portion that touches the tip of the mouth during use becomes thicker than the width, it is difficult to fold even when a child strongly chews the neck portion 3. Even if the head portion 2 is made thin, the strength of the neck portion 3 can be secured.

The first thickness T1, which is the minimum thickness of the neck portion 3, can be determined in consideration of conditions such as the constituent material of the handle body 5, bending elastic modulus, and the like. The first thickness T1 of the neck portion 3 is preferably 3.0 mm or more and 4.5 mm or less, and more preferably 3.5 mm or more and 4.3 mm or less.

Further, the maximum thickness of the neck portion 3 is preferably 4.5 mm or more and 7.0 mm or less, and more preferably 5.0 mm or more and 6.5 mm or less.

In the toothbrush 1 of this embodiment, the head portion 2 is made thin, so that the operability in the oral cavity inside the molars is improved. In addition, by increasing the thickness of the neck portion 3 relative to the width of the head portion 2 from the head portion 2 side toward the handle portion 4 side, while corresponding to the thinness of the head portion 2, the neck in use The excessive bending of the part 3 can be suppressed. For this reason, when the handle portion 4 is gripped and brushed, the position of the head portion 2 is not displaced too much, so that even the child can surely touch the bundle 7 with the tooth surface. Therefore, it becomes the toothbrush 1 which a child is easy to grasp and wipe.

(Handle (4))

2, 3A, and 4, the handle portion 4 includes a first finger touch portion 9A and a second finger touch portion 9B formed on the front and rear sides of the neck portion 3, respectively, The finger contact portion 9A and the finger contact portion 9B have gripping portions 6 formed continuously. As shown in Fig. 2, the length (handle length) L4 of the handle portion 4 is an end point or width of a straight line forming both edges of a portion where the neck portion 3 is equal or wider as viewed from the front. It is the distance from the 3rd position S3 from which the bending direction of the curve which forms both edges of the widening part changes to the rear end. The length L4 of the handle portion 4 is preferably 80 mm to 110 mm in accordance with the hand size of the child as a user.

The ratio (L4 / L3) of the length L4 of the handle portion 4 to the length L3 of the neck portion 3 is preferably 2.5 or more and 12.0 or less, more preferably 3.0 or more and 7.0 or less, and more preferably 3.5 or more and 5.5 or less desirable.

2, 3A, and 4, the handle portion 4 includes a first finger contact portion 9A that is convex toward the plantar surface 2a, and a second portion that is convex toward the rear surface 2b. The finger contact portion 9B is formed.

(1st finger contact part (9A))

As seen from the side shown in Fig. 3A, the first finger contact portion 9A is on the plantar surface 2a side, and the concave first curved surface 4a1 having a center of curvature near the neck portion 3 and the plantar surface 2a ) Side and is formed in a portion where the second curved surface 4a2 of a concave shape having a center of curvature crosses the handle portion 4.

As shown in Fig. 3B, the first finger contact portion 9A crosses the above-mentioned concave first curved surface 4a1, concave second curved surface 4a2, and curved surface 4a1 and curved surface 4a2. The convex portion is formed convex toward the planting surface 2a by the convex third curved surface 4a3 having a center of curvature on the back surface 2b side opposite to the planting surface 2a. Here, a straight line connecting the position P1 of the first curved surface 4a1 where the curvature changes and the position P2 of the second curved surface 4a2 is changed to the virtual line J. The first finger contact portion 9A has a desired height in a direction in which the water line G with respect to the virtual line J extends, and has a convex shape toward the vein surface 2a shown in FIG. 3A. As an example, a ridge line in which the first curved surface 4a1 and the second curved surface 4a2 intersect is formed at a position where the distance from the virtual line J is largest.

In addition, the ridge line formed at the intersection of the first curved surface 4a1 and the second curved surface 4a2 forms a curved first ridge line 8A as shown in FIG. 2 over the width direction of the handle portion 4. do. As seen from the front shown in FIG. 2, the first finger contact portion 9A has an arc shape in which the first ridge line 8A is convexly curved toward the neck portion 3. As seen from the front, the distance between the second position S2 and the first ridge line 8A is preferably 4 mm or more and 22 mm or less, more preferably 5 mm or more and 18 mm or less, and even more preferably 6 mm or more and 15 mm or less. . The second position S2 and the first ridge line 8A are preferably 3 mm or more and 9 mm or less, and more preferably 3 mm or more and 8 mm or less, and even more preferably 4 mm or more and 7 mm or less. .

In other words, when viewed as a plane, when the first ridge 8A is curved and the position in the X-axis direction (longitudinal) changes, the distance between the second position S2 and the first ridge 8A is the second position S2 It is defined as the shortest distance of the first ridge line 8A. In addition, when the curved surface formed by the intersection of the curved surface on the neck portion 3 side and the curved surface on the handle portion 4 side does not clearly exist, for example, when viewed from the front, the neck portion 3 and the handle portion The curvature at the seam of (4) changes, so that the position connected to the straight line or curve constituting the handle portion 4 can be set to a position corresponding to the first ridge line described above.

Therefore, when the toothbrush 1 is used for a small-mouthed child, it is a short but thinner neck portion 3, and a slightly thicker handle portion from the tip portion that can be fist-held anywhere. (4) Considering that it is (4), when the neck portion 3 and the handle portion 4 are connected at a short distance, stress tends to be concentrated in terms of strength and operability is easily affected. By setting the difference between the distance between the second position S2 and the first ridgeline 8A seen from the front, and the thickness of the position of the second position S2 and the first ridgeline 8A seen from the side, as set forth, to an appropriate range, The strength and operability of the neck portion 3 can be improved.

(2nd finger contact part (9B))

As seen from the side shown in Fig. 3A, the second finger contact portion 9B is on the plantar surface 2a side, and the convex fourth curved surface 4b1 having a center of curvature near the neck portion 3 and the plantar surface 2a ) Is opposite to the back surface 2b side and is formed in a portion where the concave fifth curved surface 4b2 having a center of curvature near the handle portion 4 intersects.

As shown in Fig. 3B, the second finger contact portion 9B is formed of two Rs of the convex fourth curved surface 4b1 and the concave fifth curved surface 4b2, and has a convex shape toward the rear surface 2b. Achieve.

Further, a second ridge line 8B as shown in Fig. 4 is formed at the intersection of the fourth curved surface 4b1 and the fifth curved surface 4b2 over the width direction of the handle portion 4. The second finger contact portion 9B has a circular arc shape in which the second ridge line 8B is convexly curved toward the neck portion 3.

3A and 3B, the protrusion amount of the first finger contact portion 9A and the second finger contact portion 9B is different from each other. Since the first finger contact portion 9A is formed from two concave curved surfaces having a center of curvature on the side of the plantar surface 2a, the intersection of the first curved surface 4a1 and the second curved surface 4a2 is thick. It is largely projected outward in the direction.

The second finger contact portion 9B includes a convex fourth curved surface 4b1 with a center of curvature located on the chamfered surface 2a side, and a fifth curved surface 4b2 with a concave center located on the back surface 2b side. ), The intersection of each of the fourth curved surface 4b1 and the fifth curved surface 4b2 does not protrude much outside the thickness direction. As can also be seen from FIG. 3A, when the bristle surface 2a of the toothbrush 1 achieves a horizontal posture, the second finger contact portion 9B is of the neck portion 3 in the thickness direction (Z direction). It does not protrude outside the back surface 3b.

Since the protruding amount of the second finger contact portion 9B is smaller than that of the first finger contact portion 9A, the second finger contact portion 9B is difficult to reach the lips during intraoral operation. On the other hand, by sufficiently securing the protruding amount of the first finger contact portion 9A, the finger is guided to the first finger contact portion 9A to be adsorbed.

The user is prevented from slipping of the finger by holding the handle portion 4 by placing the thumb and the index finger on the first finger contact portion 9A and the second finger contact portion 9B, respectively, and the toothbrush 1 ) Can be operated stably. Since the back side of the first joint of the thumb is easy to contact the first finger contact portion 9A, and the side portion of the second joint of the index finger is easy to contact the second finger contact portion 9B, brushing is not familiar. Even a small child can accurately determine the position, thereby increasing the stability when gripping the handle portion 4.

2 and 4, the width of the gripping portion 6 is gradually enlarged from each finger touching portion 9A and finger touching portion 9B side toward the rear end side of the gripping portion 6, and then It is shrinking and expanding again, gradually becoming thicker toward the rear end. The above-described enlarged diameter and shaft diameter may be repeated 2 to 4 times. In addition, the thickness of the gripping portion 6 is gradually enlarged from each finger touching portion 9A and finger touching portion 9B side toward the rear end side of the gripping portion 6, and then reduced.

2 and 4, as viewed from the front, the minimum width W6min (FIG. 4) of the gripping portion 6 is smaller than the maximum width W9max (FIG. 4) of the finger contact portion 9A and the finger contact portion 9B. , The maximum width W6max (Fig. 4) of the gripping portion 6 is larger than the maximum width W9max (Fig. 4) of the finger touching portion 9A and the finger touching portion 9B.

Here, the maximum width W9max of the finger contact portion 9A and the finger contact portion 9B is preferably 12.5 mm or more and 16.5 mm or less, and more preferably 13.5 mm or more and 15.5 mm or less.

The maximum width W6max of the gripping portion 6 is preferably 18.0 mm or more and 22.0 mm or less, and more preferably 19.0 mm or more and 21.0 mm or less.

The minimum width W6min of the gripping portion 6 is preferably, for example, 8.0 mm or more and 13.0 mm or less, and more preferably 9.0 mm or more and 12.0 mm.

In addition, the thickness of the gripping portion 6 is preferably 7.0 mm or more and 15 mm or less.

If it is within the range of the above dimensions, it can be surely held by the small hand of a child.

A recessed portion 6A that is recessed inward in the width direction is formed on both side surfaces of both sides in the width direction at the tip portion of the gripping portion 6 that is the minimum width W6min. The user can make the middle finger touch the concave portion 6A, for example, so that the child can reliably lift the handle portion 4, making it easier to brush. In addition, the handle portion 4 can be extended by placing the thumb and the index finger on each of the recesses 6A, respectively. Therefore, for example, it is possible to stably operate the toothbrush 1 in the horizontal direction even when brushing the side surfaces of the teeth.

In addition, on the side surface of the gripping portion 6, which gradually becomes thicker toward the rear end side, a plurality of curved surfaces that convexly curve in the width direction outwardly while continuing to the respective concave portions 6A, 6A, and these A plurality of recesses formed between the curved surfaces are formed. Since the curved surface and the recessed part alternately exist in the longitudinal direction of the gripping part 6, the user's finger is guided to the recessed part by itself, thereby increasing the grip feeling, so that even a child with weak grip can stably hold it. In addition, since the entire handle portion 4 is slightly thick and has an angleless shape, it can be surely gripped even with a small hand of a child.

The toothbrush 1 of this embodiment is manufactured according to the conventionally well-known manufacturing method of the toothbrush. For example, a hard resin is injected into a mold, and the handle 15 body is molded. Subsequently, the toothbrush 1 is obtained by planting the hair bundle 7 on the planting surface 2a of the obtained handle body 5. As a method for planting the bundle 7, for example, folding the bundle 7 in half and inserting a flat line sandwiched therebetween into the planting hole 2h, the planting of the bundle 7 is carried out. After wire forming, heat fusion method to press and fix the lower end of the bundle 7 in the molten resin to be the bristle part 11, heat the lower end of the bundle 7 to form a molten mass, and then melt the resin in the mold. And an in-mold method for molding the implanted portion 11 by injection.

[Example]

Hereinafter, the present invention will be described in detail by showing examples, but the present invention is not limited to the following examples, and can be carried out by appropriately changing the scope without departing from the gist thereof.

Materials used in this example are as follows.

<Handle body (5)> Polypropylene

<Features of bundle (7)> PBT

For the toothbrushes shown in Figs. 1 to 4, the toothbrushes of Examples 1 to 2 and Comparative Examples 1 to 8 were produced by injection molding according to the specifications shown in Table 1.

Table 1 shows the dimensions of each toothbrush.

[Evaluation of operability in oral cavity]

The expert responded in 4 steps about the good operability of the toothbrush 1 when the entire teeth were completely brushed using a child's chin model. The operability was evaluated according to the following criteria from the average of 10 persons, with "very good" of 4 points, "good" of 3 points, "slightly good" of 2 points, and "bad" of 1 point.

○: 2.5 points or more

△: 1.5 points or more and less than 2.5 points

×: less than 1.5 points

As can be seen from Table 1, in the toothbrushes of Examples 1 and 2, good operability is obtained in the oral cavity of a child.

According to the toothbrush 1 shown in each embodiment demonstrated above, favorable operability is obtained in the oral cavity of a child. In addition, by setting the shape of a toothbrush adapted to children's growth, it is possible to properly wipe a place difficult to wipe in the oral cavity.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to the related examples. It is clear that a person skilled in the art can imagine various modifications or modifications within the scope of the technical idea described in the claims, and it is understood that they also belong to the technical scope of the present invention.

For example, by appropriately designing the shape of the handle portion, the covering shape of the soft resin, and the exposed shape of the soft resin, it is possible to improve the sliding effect and improve the designability.

The present invention can be applied to a toothbrush.

1: toothbrush
2: Head
2a: Eating noodles
2b: back
3: Neck part
3a: Surface
4: Handle part
5: handle body
6: gripping part
7: bundle
8A: first ridge
8B: second ridge
9A: first finger touch
9B: second finger touch
11: Parents
4a1: first curved surface
4a2: second surface
4b1: fourth surface
4b2: fifth surface
A1: 1st point
A2: Second point
A3: Third point
S1: 1st position (head part and neck part boundary)
S2: 2nd position (the position which moved 20 mm from the 1st position S1 to the handle part 4 side)
S3: Third position (the boundary between the neck portion 3 and the handle portion 4)
L1, L2, L3: virtual straight line
L2: Length of the head part 2
L3: Length of the neck part 3
L4: Length of the handle part 4
T2: thickness of the head portion 2
W1: first width
W2: second width

Claims (11)

A hair part comprising a plurality of hair bundles,
The bristle portion is provided with a handle body having a head portion, a neck portion, and a handle portion provided on the bristle surface,
From the front,
The length of the neck portion is 15 mm or more and 35 mm or less,
The total length of the head portion and the neck portion is 28 mm or more and 68 mm or less,
The neck portion has a width of 4 mm or more and 6 mm or less,
Seen from the side,
The thickness of the head portion is 2 mm or more and 4 mm or less,
As seen from the front, the distance between the second position moved 20 mm from the first position located at the boundary of the neck portion and the head portion to the handle portion, and the position of the ridge line of the finger contact portion is 4 mm or more and 22 mm or less,
The second position and the position of the ridge line of the finger contact portion, the difference in thickness seen from the side is 3 mm or more and 9 mm or less. The width according to claim 1, wherein the relationship between the width of the neck portion viewed from the front side and the thickness of the neck portion viewed from the side faces toward the rear end in a section from the first position to the second position. The amount of change in thickness is always equal to or greater than the toothbrush. The toothbrush according to claim 2, wherein the relationship between the width and the thickness of the neck portion is reversed from the first position to the second position. The surface of the neck surface side of the neck portion according to any one of claims 1 to 3,
A first point that becomes the center of the thickness of the tip of the head portion viewed from the side,
The toothbrush which forms a straight line along the straight line which connected the 2nd point which becomes the center of the thickness seen from the side surface at the center position in the longitudinal direction seen from the said front side. The surface of the neck surface side of the neck portion according to any one of claims 1 to 3,
A first point that becomes the center of the thickness of the tip of the head portion viewed from the side,
Toothbrush forming a straight line along a straight line connecting the third point that is the center of the thickness of the rear end of the handle portion seen from the side. According to any one of claims 1 to 5, wherein the handle body, the first finger contact portion that is convex toward the hair surface of the handle portion, near the neck portion of the handle portion, and the back surface side opposite to the hair surface Has a convex second finger touch,
The first finger contact portion, as viewed from the side, a portion of the first curved surface having a center of curvature on the neck portion side of the bristle surface side, and a second curved surface having a center of curvature on the handle portion side of the bristle surface side intersect Is formed on,
The second finger contact portion is viewed from the side, where the fourth curved surface having a center of curvature on the neck portion side of the chamfered surface side and a fifth curved surface having a center of curvature on the handle portion side of the back side intersect. Shaped toothbrush. The method of claim 6, wherein the first finger contact portion is, as viewed from the front, a first ridge line formed at an intersection of the first curved surface and the second curved surface is convexly curved toward the neck portion. ,
The second finger contact portion, as viewed from the rear, the second ridge line formed on the intersection of the fourth curved surface and the fifth curved surface is a toothbrush, convexly curved toward the neck portion side. The toothbrush according to any one of claims 1 to 7, wherein a width in the longitudinal direction of the neck portion is constant when viewed from the front. The toothbrush according to any one of claims 1 to 8, wherein a material of the handle body is polypropylene resin. The toothbrush according to any one of claims 1 to 9, wherein at least a part of the handle body is covered with a soft resin. The toothbrush according to any one of claims 1 to 10, wherein the total length of the handle body is 110 mm or more and 170 mm or less.

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