WO2015037495A1

WO2015037495A1 - Tooth brush

Info

Publication number: WO2015037495A1
Application number: PCT/JP2014/073207
Authority: WO
Inventors: 良祐蜂須賀
Original assignee: ライオン株式会社
Priority date: 2013-09-13
Filing date: 2014-09-03
Publication date: 2015-03-19
Also published as: CN105491912A; KR20160055144A; JP2015054209A; KR102237310B1; JP6364641B2

Abstract

Provided is a tooth brush comprising a handle, a neck that extends out from the handle, and a head disposed at the end of the neck. A plurality of bristle bundles are implanted into a bristle implanting surface of the head. The tooth brush is characterized in that in at least two places on the handle, formed are narrowed portions configured so that the diameter of the narrowed portion cross-section orthogonal to the extension direction of the handle is gradually reduced and then expanded from the back end going towards the neck.

Description

toothbrush

The present invention relates to a toothbrush. This application claims priority on September 13, 2013 based on Japanese Patent Application No. 2013-190862 for which it applied to Japan, and uses the content here.

Generally, as a method of gripping a toothbrush, a pen grip type and a palm grip type are known.
The pen grip type is similar to how to hold a pen or the like when writing, as shown in FIG. The pen grip type is suitable for finely operating the brush part in the oral cavity.
The toothbrush suitable for the pen grip type is a position close to the joint with the neck, and has an elliptical shape in plan view at four locations on the flocked surface side, back surface side, and both side surfaces of the outer peripheral surface of the grip portion. There has been proposed a toothbrush in which a recess having a hole shape or a rectangular shape with rounded corners is provided, and the cross-sectional shape of the grip portion of the portion where the recess is formed is a substantially square with rounded corners (for example, Patent Documents). 1).

As shown in FIG. 4, the palm grip type is a way of holding the thumb with the handle while wrapping the handle with the palm and fingers. The palm grip type is easy to grip the handle portion powerfully and easily applies a strong scrubbing force when cleaning the oral cavity. For example, many infants operate a toothbrush with the handle portion gripped in a form similar to a palm grip type.
As a toothbrush suitable for the palm grip type, a dent is provided on the flocked surface side and the back surface side of the grip portion close to the joint portion with the neck portion, and the dent center is also provided on both side surfaces of the grip portion. A toothbrush that is provided with dents facing each other so as to have a center in the rear end direction of the grip part, and these dent shapes are elliptical, long hole, or rectangular with rounded corners in plan view. It has been proposed (for example, Patent Document 2).

For example, in the oral cavity cleaning for infants with inadequate oral cleaning techniques, after an infant grips and operates a child's toothbrush with his / her own hand, an adult (eg, a parent) pen grips the child's toothbrush with a pen grip. In many cases, the finish is polished by gripping and operating with a formula.
Since adults and infants have different hand sizes and different grips, children's toothbrushes are difficult for either of them to handle.
For such problems, the cross-sectional shape in the vicinity of the center of the gripping portion is substantially octagonal, and the width of the horizontal planes on the top and bottom surfaces parallel to the flocked surface of the head portion in this octagonal cross section is the width of the gripping portion front end or gripping portion rear end. There has been proposed a toothbrush in which the cross-sectional shape of the entire gripping portion is formed so as to continuously and gradually spread from either side toward the other end side (for example, Patent Document 3).

JP 2000-125937 A JP 2000-189250 A JP 2000-262329 A

However, there is a demand for a toothbrush for children that is easier to handle for both adults and infants. That is, there is a need for a toothbrush that is easy to handle, both for users who are unskilled in their own oral cleaning techniques and for users who are finishing polish for others.
Therefore, an object of the present invention is to provide a toothbrush that is easy to handle both for users who are immature in their own oral cleaning techniques and for users who are finishing polish for others.

The toothbrush of the present invention includes a handle portion, a neck portion extended to the handle portion, and a head portion provided at a tip of the neck portion, and a plurality of hair bundles are implanted on the flocked surface of the head portion. In the toothbrush provided, the handle portion is formed with two or more constricted portions that gradually decrease in diameter from the rear end toward the neck portion and then increase in diameter.
The tip of the neck portion refers to a portion of the neck portion opposite to the side where the handle portion is present.
The constricted portion is preferably covered with a soft resin. Moreover, it is preferable that the area | region which is not coat | covered with the said soft resin is formed between the arbitrary said narrow part and the narrow part adjacent to this narrow part.

The toothbrush of the present invention is easy to handle both for users who are immature in their own oral cleaning techniques and for users who are finishing and polishing others.

It is the top view which looked at the toothbrush concerning 1st embodiment of this invention from the perpendicular direction when the toothbrush was left still with the flocked surface up. It is the side view which looked at the toothbrush concerning 1st embodiment of this invention from the horizontal direction, when a toothbrush is left still with a flocked surface up. It is a figure which shows how to hold the toothbrush by a pen grip type. It is a figure which shows how to hold the toothbrush by a palm grip type.

In the toothbrush of the present invention, constricted portions are formed at two or more positions of the handle portion.
A toothbrush according to an embodiment of the present invention will be described below with reference to FIGS.
The toothbrush 1 shown in FIGS. 1 and 2 includes an elongated handle portion 6, a neck portion 4 extending from the handle portion 6, and a head portion 2 provided at the tip of the neck portion 4. A body and a plurality of hair bundles 22 planted on the hair transplantation surface 20 of the head portion 2 are provided.

The head part 2 has a rectangular shape in plan view with the extending direction of the handle body as the longitudinal direction. In this specification, the rectangle is a concept including a rectangle and a shape in which corners are formed by curves and straight lines at four corners of the rectangle. Sixteen hair bundles 22 in which a plurality of hairs are bundled are planted in a staggered pattern on the flocked surface 20. In this specification, the direction in plan view refers to the direction seen from above in the vertical direction when the toothbrush is placed with the flocked surface 20 facing up.

The handle portion 6 is directed from the rear end 8 toward the neck portion 4, and the rear portion 60, the first constricted portion 62, the enlarged diameter portion 64, the second constricted portion 66, and the front portion 68 are arranged in this order. Is formed.
The boundary between the first constricted portion 62 and the rear portion 60 is, for example, the first constricted portion in which the cross section perpendicular to the extending direction of the handle portion 6 (also referred to as a cross section) has the maximum diameter in the rear portion 60. A position close to. The boundary between the first constricted portion 62 and the enlarged diameter portion 64 is, for example, a position where a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the handle portion 6 takes the minimum diameter in the first constricted portion 62. In the enlarged diameter portion 64, it means an intermediate position from a position where a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the handle portion 6 takes the maximum diameter.
The boundary between the second constricted portion 66 and the enlarged diameter portion 64 is, for example, a position where a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the handle portion 6 takes the minimum diameter in the second constricted portion 66. In the enlarged diameter portion 64, it means an intermediate position from a position where a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the handle portion 6 takes the maximum diameter.
The boundary between the second constricted portion 66 and the front portion 68 is, for example, a position where a cross section (also referred to as a cross section) perpendicular to the extending direction of the handle portion 6 takes the maximum diameter in the front portion 68.
The rear portion 60 is a columnar shape having a substantially circular cross section (transverse cross section) with respect to the extending direction of the handle portion 6, and the rear end 8 is rounded. The term “substantially circular” is not limited to a perfect circle or an ellipse, but is a concept including a shape formed only by a curved line whose outer cross section bulges outward, and a shape in which a straight line is formed in a part of the circle. In the present embodiment, a flat surface portion 60 a is formed on the front surface (surface on the side of the flocked surface 20) and the back surface (surface opposite to the flocked surface 20) of the rear portion 60. That is, in the cross section of the rear portion 60, the portions corresponding to the front and back surfaces of the handle body are straight lines. By forming the flat surface portion 60a, the toothbrush 1 can be prevented from rolling, and a sticker such as a character can be stuck without bending.
A protrusion 61 having a rectangular shape in side view is formed on the side surface of the rear portion 60. This protrusion 61 acts as a slip stopper. The side surface of the rear portion 60 refers to a surface where the toothbrush can be seen from the horizontal direction when the toothbrush is placed with the flocked surface 20 facing upward, and the rear end 8 is excluded.

A section (also referred to as a transverse section) perpendicular to the extending direction of the handle portion 6 of the first constricted portion 62 is gradually reduced in diameter from the tip of the rear portion 60 toward the neck portion 4 and then expanded. The first constricted portion 62 has a circular cross section such as a true circle or an ellipse, and is recessed in, for example, an arc shape in a plan view and a side view. A protrusion 63 having a rectangular shape in a side view is formed on the side surface of the first constricted portion 62. This protrusion 63 acts as a slip stopper. Moreover, it is preferable that the cross section of the 1st constriction part 62 is a perfect circle.

The diameter-expanded portion 64 is a portion whose diameter has been expanded from the first constricted portion 62, and is a substantially cylindrical portion positioned between the first constricted portion 62 and the second constricted portion 66. In the present embodiment, a flat surface portion 64 a is formed on the back surface (surface opposite to the flocked surface 20) of the enlarged diameter portion 64. By forming the flat surface portion 64a, the toothbrush 1 can be prevented from rolling.

A cross section (also referred to as a transverse cross section) of the second constricted portion 66 perpendicular to the extending direction of the handle portion 6 is gradually reduced in diameter from the enlarged diameter portion 64 toward the neck portion 4 and then expanded. The second constricted portion 66 has a circular cross section, and is recessed, for example, in an arc shape in a plan view and a side view. A protrusion 67 having a rectangular shape in a side view is formed on the side surface of the second constricted portion 66.
The protrusion 67 acts as a slip stopper. In the present embodiment, the cross section of the second constricted portion 66 is preferably similar or congruent with the cross section of the first constricted portion 62.

The front portion 68 extends from the tip of the second constricted portion 66 toward the neck portion 4, extends with the same diameter, and then gradually decreases in diameter to reach the neck portion 4. In the present embodiment, a cross section (also referred to as a cross section) perpendicular to the extending direction of the handle portion 6 of the front portion 68 is preferably similar or congruent with the cross section of the first constricted portion 62.

The neck portion 4 extends from the front end of the front portion 68 toward the head portion 2 and extends with, for example, substantially the same diameter in a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the neck portion 4 to reach the head portion 2. . In the present embodiment, a cross section (also referred to as a cross section) perpendicular to the extending direction of the handle portion 6 of the neck portion 4 is preferably similar or congruent with the cross section of the front portion 68.

In the present embodiment, the handle body includes a base made of a hard resin and a covering portion 70 in which the base is covered with a soft resin. The covering portion 70 is formed from the first constricted portion 62 to the second constricted portion 66. That is, the first constricted portion 62 and the second constricted portion 66 are covered with a soft resin. In the present embodiment, the covering portion 70 is formed around the first constricted portion 62 and the second constricted portion 66.
In the enlarged diameter portion 64, the base body is exposed, and an exposed portion 72 having an elliptical shape in plan view is formed. The exposed portion 72 is an area including a position where a cross section (also referred to as a transverse cross section) perpendicular to the extending direction of the handle portion 6 in the enlarged diameter portion 64 has a maximum diameter, and is formed on the front and back of the handle body.

Examples of the material of the substrate include a hard resin having a flexural modulus (JIS K7203) of 500 to 3000 MPa.
Examples of the hard resin include polycyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate (PET), polystyrene (PS), acrylonitrile / butadiene / styrene resin (ABS), polycarbonate (PC), acrylonitrile / styrene copolymer resin ( AS), polyarylate, polypropylene (PP), polyacetal (POM), polybutylene terephthalate (PBT), and the like. These hard resins may be used alone or in a combination of two or more.

The material of the covering portion 70 is a soft resin. The soft resin is preferably one that can be deformed by a finger pressing force. For example, a resin having a Shore hardness A of 90 or less is preferable, and a resin having a Shore hardness A of 50 to 80 is more preferable. Examples of the soft resin include elastomers (for example, olefin elastomers, styrene elastomers, polyester elastomers, polyurethane thermoplastic elastomers, etc.) and silicone. The shore hardness is a value obtained by applying a test load that changes in accordance with the indentation depth to the sample using an indenter, and obtained from the indentation depth h, and is measured by the method described in JIS K7215. .
The soft resin may contain an adhesive modifier, a plasticizer, or the like as necessary.

The magnitude | size of the head part 2 is suitably determined according to the subject who cleans the intraoral area with the toothbrush 1. If the toothbrush 1 is for a child, the size of the head portion 2 is preferably, for example, a width of 8 to 11 mm and a length of 13 to 22 mm. The distance from the tip of the head part 2 to the rear end of the hair bundle on the most rear end side of the hair bundle 22, and the distance of the hair bundle on the most rear end side of the hair bundle 22 from the tip of the head part 2 The distance to the rear end is preferably 12 to 20 mm, for example.
The thickness of the head part 2 is appropriately determined according to the subject whose mouth is cleaned with the toothbrush 1. If the toothbrush 1 is for children, the thickness of the head portion 2 is preferably 2.6 to 5 mm, for example.
The width of the head portion 2 is the maximum length in the horizontal direction and the direction perpendicular to the extending direction of the handle portion 6 when the toothbrush is placed with the flocked surface of the head portion 2 facing upward. The distance from the tip of the head part 2 to the rear end of the fur bundle on the most rear end side of the bristle bundle 22 is the horizontal direction when the toothbrush is allowed to stand with the flocked surface of the head part 2 up and the handle part. 6 is the maximum length in the direction parallel to the extending direction.

The length of the toothbrush 1, that is, the length of the handle body is appropriately determined according to the subject whose mouth is cleaned with the toothbrush 1. If the toothbrush 1 is for a child, the length of the handle body is preferably, for example, 140 to 170 mm, more preferably 140 to 160 mm, and most preferably 140 to 150 mm. The length of the toothbrush 1 refers to the maximum distance from the front end of the head portion 2 to the rear end 8 of the handle portion 6.

The hair bundle 22 may be cylindrical or prismatic.
The length (hair length) from the flocked surface 20 to the tip of the hair bundle 22 is determined in consideration of the hair and the like required for the hair bundle 22, and is preferably 6 to 13 mm, for example.
The thickness (hair bundle diameter) of the hair bundle 22 on the flocked surface 20 is determined in consideration of the waist and the like required for the hair bundle 22, and is preferably 1 to 2 mm, for example. When the hair bundle 22 has a polygonal column shape, the hair bundle diameter is a diameter of a circumscribed circle having a cross section parallel to the extending direction of the handle portion 6.

As the hair constituting the hair bundle 22, for example, the diameter gradually decreases toward the hair tip, the hair having a sharp hair tip (tapered hair), and the diameter from the flocked surface 20 toward the hair tip. Examples include hairs that are almost the same (straight hairs). Examples of the straight hair include those in which the surface composed of the bristles is a plane substantially parallel to the flocked surface 20 and the surface composed of the bristles rounded into, for example, a hemisphere.
The length (hair length) from the flocked surface 20 to the tip of the hair bundle 22 refers to the maximum distance from the surface of the flocked surface 20 where the hair bundle 22 is implanted to the tip of the hair bundle.

The material of the hair is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), Examples thereof include polyesters such as polybutylene naphthalate (PBN), polyolefins such as PP, elastomer resins such as olefin elastomers and styrene elastomers. These resin materials can be used singly or in combination of two or more.
Examples of the bristle include polyester bristle having a multi-core structure having a core and at least one or more sheaths provided outside the core.

The cross-sectional shape of the bristle, that is, the shape of the cross-section parallel to the extending direction of the handle portion 6 is not particularly limited, and is a perfect circle, an ellipse-like circle, a polygon, a star, a three-leaf clover, It is good also as a leaf clover shape. The cross-sectional shape of all the hairs may be the same or different.

The thickness of the hair can be determined in consideration of the material and the like. When the cross section is circular, for example, 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm) is preferable. Further, in consideration of a feeling of use, a feeling of brushing, a cleaning effect, durability, and the like, a plurality of hairs having different thicknesses may be used in any combination.

In this embodiment, it is preferable that the maximum diameter of each cross section in the rear part 60, the enlarged diameter part 64, and the front part 68 is the same. The same means that the difference in diameter is within ± 1%.
The maximum diameter R1 of the cross section of the rear portion 60 is appropriately determined according to the subject to be cleaned in the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the maximum diameter R1 is preferably 10 to 14 mm, and more preferably 11 to 12 mm. If it is equal to or higher than the lower limit value, the infant can easily grip the handle portion 6, and if it is equal to or lower than the upper limit value, an adult can easily grip the handle portion 6 with the pen grip type and operate the toothbrush 1.
In addition, when the cross section of the handle body is other than a perfect circle, the minimum diameter of the cross section of the neck portion 4, the maximum diameter of the cross section of the front portion 68, the cross section of the first constricted portion 62 and the second constricted portion 66. The minimum diameter of the surface, the maximum diameter of the cross section of the enlarged diameter portion 64, and the maximum diameter of the cross section of the rear portion 60 are the diameters of circumscribed circles of the cross section.

The minimum diameter R2 of the cross section in the first constricted portion 62 is appropriately determined according to the subject who is to clean the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the minimum diameter R2 is preferably 8 to 12 mm, and more preferably 9 to 10 mm. If it is in the said range, an adult will hold | grip the handle | steering-wheel part 6 with a pen grip type | formula, and will operate the toothbrush 1 easily.
A preferable range of the minimum diameter of the cross section of the second constricted portion 66 is the same as the minimum diameter of the cross section of the first constricted portion 62. In the present embodiment, the minimum diameter R2 of the first constricted portion 62 and the minimum diameter of the second constricted portion 66 may be the same or different, but the same is preferable from the viewpoint of easier handling.

The degree of constriction of the first constricted part 62, that is, the constriction depth D1 represented by (R1-R2) / 2 is appropriately determined according to the subject whose mouth is to be cleaned with the toothbrush 1. If the toothbrush 1 is for children, the depth D1 is preferably 1 to 2 mm. If it is in the said range, when an adult hold | grips with a pen grip type | formula, a finger will be hard to get tired.
The constricted portion of the first constricted portion 62 has a shape formed by combining two or more of the radius of curvature of R25 to 55 mm or the radius of curvature of R25 to 55 mm. As one aspect of the present invention, the constricted portion of the first constricted portion 62 has a shape configured by continuously combining curvature radii of R51 mm and R53 mm.
Further, in the first constricted portion 62, the cross section perpendicular to the extending direction of the handle portion 6 (also referred to as a transverse cross section) has a minimum diameter, and the enlarged diameter portion 64 is perpendicular to the extending direction of the handle portion 6. The shortest distance to a position where a large cross section (also referred to as a transverse cross section) takes the maximum diameter is preferably 5 to 25 mm, and more preferably 10 to 20 mm. A cross section perpendicular to the extending direction of the handle portion 6 in the front portion 68 from a position where the cross section perpendicular to the extending direction of the handle portion 6 (also referred to as a transverse cross section) takes the minimum diameter in the first constricted portion 62 ( The shortest distance to the position where the maximum diameter of the cross section) is also preferably 5 to 25 mm, and more preferably 10 to 20 mm.
The degree of constriction of the second constricted part 66 may be the same as or different from the degree of constriction of the first constricted part 62, but is the same as the degree of constriction of the first constricted part 62. It is preferable.
That is, the constricted portion of the second constricted portion 66 has a shape formed by combining two or more of the radius of curvature of R25 to 55 mm or the radius of curvature of R25 to 55 mm. As one aspect of the present invention, the constricted portion of the second constricted portion 66 has a shape formed by continuously combining curvature radii of R25 mm and R48 mm.
Further, in the second constricted portion 66, the cross section perpendicular to the extending direction of the handle portion 6 (also referred to as a transverse cross section) has a minimum diameter, and the enlarged diameter portion 64 is perpendicular to the extending direction of the handle portion 6. The shortest distance to a position where a large cross section (also referred to as a transverse cross section) takes the maximum diameter is preferably 5 to 25 mm, and more preferably 10 to 20 mm. A cross section perpendicular to the extending direction of the handle portion 6 in the rear portion 60 from a position where the cross section perpendicular to the extending direction of the handle portion 6 (also referred to as a transverse cross section) takes the minimum diameter in the second constricted portion 66 ( The shortest distance to the position where the maximum diameter of the cross section) is also preferably 5 to 25 mm, and more preferably 10 to 20 mm.
The degree of tightness of the first constricted part 62 and the degree of constriction of the second constricted part 66 may be the same or different, but the same is preferable from the viewpoint of easier handling.

The distance L1 between the position of the minimum diameter of the cross section in the first constricted portion 62 and the position of the minimum diameter of the cross section in the second constricted portion 66 depends on the subject to be cleaned in the oral cavity with the toothbrush 1. It is determined appropriately. As one aspect of the present invention, if the toothbrush 1 is for children, the distance L1 is 10 to 20 mm. If the toothbrush 1 is for a child, the distance L1 is 10 to 30 mm as another aspect of the present invention, and the distance L1 is 20 to 30 mm as another aspect of the present invention. If it is in the said range, the infant will be easy to hold | grip the enlarged diameter part 64 with a heel grip.

The distance L2 from the tip of the head part 2 to the center of the enlarged diameter part 64 is appropriately determined according to the subject to be cleaned in the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the distance L2 is preferably 80 to 120 mm, more preferably 80 to 100 mm, and most preferably 80 to 90 mm. If it is in the said range, the infant will be easy to operate the toothbrush 1 by grasping the enlarged diameter part 64 with a scissors grip. The distance L2 from the tip of the head portion 2 to the center of the enlarged diameter portion 64 refers to the distance from the surface where the diameter of the cross section is maximum in the enlarged diameter portion 64 to the distal end of the head portion 2.

The minimum diameter R3 of the cross section in the neck portion 4 is not particularly limited, but is preferably 3 to 5 mm, for example.

The toothbrush 1 is obtained by a conventionally known manufacturing method. An example of the manufacturing method of the toothbrush 1 is demonstrated.
In the manufacturing method of this example, a resin forming the base is injected into the primary mold to obtain the base, the base is placed in the secondary mold, and the covering portion 70 is configured in that state. A secondary molding step of injecting the resin to be injected into the secondary mold, and a planting step of planting the hair bundle 22 on the hair planting surface 20 of the head portion 2.

In the primary molding step, a known injection molding method is applied to obtain a substrate on which a concave portion corresponding to the covering portion 70 is formed.
In the secondary molding step, the base body is placed in the secondary mold, and then the resin constituting the coating portion 70 is injected into the secondary mold to form the coating portion 70 to obtain the handle body. At this time, by forming the exposed portion 72, the base body can be satisfactorily fixed in the secondary mold.
Next, the toothbrush 1 is obtained by implanting the hair bundle 22 on the flocked surface 20 of the obtained handle body. As a method of planting the hair bundle 22, for example, the hair bundle is folded in half, and a flat wire flocked in which a hair bundle is implanted by driving a flat wire sandwiched between the hair bundles into a flocked hole, the lower end of the hair bundle is A heat-sealing method in which the flocked portion is pressed into and fixed in the molten resin, and an in-mold method in which the molten resin is injected into the mold after the lower end of the hair bundle is heated to form a molten lump and then the flocked portion is formed. Etc.

Next, how to use the toothbrush 1 will be described by taking as an example the case of cleaning the oral cavity of an infant.
First, the infant grasps an arbitrary position of the handle portion 6 with a scissors grip, and cleans his or her mouth. At this time, the infant can grip the handle portion 6 with strong force by operating the toothbrush 1 by grasping the handle portion 6 around the enlarged diameter portion 64. In addition, since the exposed portion 72 from which the hard resin is exposed is formed in the enlarged diameter portion 64, the infant can grip the handle portion 6 more strongly.

Next, when the adult polishes the infant's oral cavity, the finger is placed on the first constricted portion 62 or the second constricted portion 66, and the handle portion 6 is gripped by the pen grip type. Since the first constricted portion 62 and the second constricted portion 66 are reduced in diameter, the handle portion 6 is easily gripped by a pen grip type. In addition, since the handle portion 6 is formed with the first constricted portion 62 and the second constricted portion 66, a suitable gripping position can be selected according to the site to be cleaned, such as the front teeth and the back teeth. Furthermore, since the covering part 70 is formed in the 1st narrow part 62 and the 2nd narrow part 66, the finger | toe which grips the handle | steering-wheel part 6 is hard to get tired, and a finger is hard to slip.

As described above, in the toothbrush 1 of the present embodiment, the first narrow portion 62 and the second narrow portion 66 are formed in the handle portion 6, and the gap between the first narrow portion 62 and the second narrow portion 66 is formed. Since it is set as the enlarged diameter part 64, it is easy to handle both for users who are not skilled in cleaning their own oral cavity and for users who are finishing and polishing others.
The toothbrush 1 of this embodiment is suitable as a toothbrush for children, particularly for infants.

The present invention is not limited to the embodiment described above.
In the above-described embodiment, the constricted portion is formed at two positions of the handle portion, but the present invention only requires that the constricted portion is formed at two or more positions. However, if there are too many constricted parts, the length of the toothbrush becomes excessively long and difficult to handle, or the distance between the constricted parts may be too short, making it difficult to grasp with a scissors grip. For this reason, the constricted portion is preferably 2 to 3 places.

In the above-described embodiment, the maximum diameters of the cross sections of the front part, the enlarged diameter part, and the rear part are the same. However, the present invention is not limited to this, and the front part, the enlarged diameter part, and the rear part. The maximum diameter may be different from each other. However, it is preferable that at least the maximum diameter of the cross section of the enlarged diameter portion is the maximum diameter of the cross section of the handle portion, from the viewpoint that the handle portion can be gripped more strongly by the heel grip or palm grip type. More preferably, the maximum cross-sectional diameters of the rear portion are the same.

In the above embodiment, the handle section has a substantially circular cross section. However, the present invention is not limited to this, and the handle section may have a substantially polygonal cross section. The term “substantially polygonal” is a concept that includes one in which a corner of a curve is formed at each apex, and one in which some sides are formed by arcs.
In the above-described embodiment, the cross sections of the neck portion, the front portion, the enlarged diameter portion, the constricted portion, and the rear portion are all substantially circular, but the present invention is not limited to this. For example, the cross section of any of the neck portion, the front portion, the enlarged diameter portion, the constricted portion, and the rear portion may be substantially polygonal.

In the above-mentioned embodiment, the plane part is formed on the front and back of the rear part, but the present invention is not limited to this, and the plane part may be formed only on either the front or back of the rear part, The flat portion may not be formed.
In the above-described embodiment, the planar portion is formed on the back surface of the enlarged diameter portion, but the present invention is not limited to this, and the planar portion may be formed on the surface of the enlarged diameter portion, or the enlarged diameter portion. A flat surface portion may be formed on the front and back surfaces, and a flat surface portion may not be formed on the enlarged diameter portion.

In the above-described embodiment, the constricted portion is covered with the soft resin to form the covering portion. However, the present invention is not limited to this, and the covering portion may not be formed. A part may be formed. When the handle portion is gripped by the pen grip type, it is preferable that the covering portion is formed in the region including the constricted portion so that the fingers are less fatigued and the fingers are more difficult to slip.

In the above-described embodiment, the protrusions are formed on both the first and second constricted portions, but the present invention is not limited to this, and the protrusion is formed only on one of the first and second constricted portions. A part may be formed, and the projection part does not need to be formed in the 1st and 2nd constriction part.
In the above-described embodiment, the protruding portion is formed in the rear portion, but the present invention is not limited to this, and the protruding portion may not be formed in the rear portion.

In the above-described embodiment, the exposed portion is formed in the enlarged diameter portion, but the present invention is not limited to this, and the exposed portion may not be formed in the enlarged diameter portion.

In the above-described embodiment, 16 hair bundles are planted on the flocked surface, but the present invention is not limited to this, and the number of hair bundles may be 15 or less, or 17 or more. The number of hair bundles is preferably 10 to 28.
In the above-described embodiment, the hair bundles are arranged in a staggered manner, but the present invention is not limited to this, and any arrangement pattern of the hair bundles may be used.

The toothbrush of the present invention is easy to handle both for a user who is unskilled in the cleaning technique of his / her mouth and for a user who finishes other people. Therefore, the present invention can be suitably used as a “toothbrush” and is extremely important in industry.

1
Toothbrush 2
Head 4
Neck part 6
Handle part 8
Rear end 20 Planted surface 22 Hair bundle 62 First constricted portion 64 Expanded portion 66 Second constricted portion 70 Cover portion 72 Exposed portion

Claims

A toothbrush comprising a handle portion, a neck portion extended to the handle portion, and a head portion provided at the tip of the neck portion, and having a plurality of hair bundles planted on the flocking surface of the head portion. And
The handle portion is formed with two or more constricted portions whose cross section perpendicular to the extending direction of the handle portion gradually decreases in diameter from the rear end toward the neck portion and then expands. Toothbrush.
The toothbrush according to claim 1, wherein the constricted portion is coated with a soft resin.
The toothbrush according to claim 2, wherein a region not covered with the soft resin is formed between any of the constricted portions and a constricted portion adjacent to the constricted portion.
The toothbrush according to any one of claims 1 to 3, wherein the constricted portion of the first constricted portion 62 has a shape formed by combining two or more of a radius of curvature of R25 to 55 mm or a radius of curvature of R25 to 55 mm.
The position where the cross section perpendicular to the extending direction of the handle part 6 takes the minimum diameter in the first constricted part 62, and the position where the cross section perpendicular to the extending direction of the handle part 6 takes the maximum diameter in the enlarged diameter part 64. The toothbrush according to any one of claims 1 to 4, wherein the shortest distance is 10 to 20 mm.
The toothbrush according to any one of claims 1 to 5, wherein the first constricted portion has a constricted depth of 1 to 2 mm.
There are two constricted portions, the position of the smallest diameter of the cross section perpendicular to the extending direction of the handle portion at the first constricted portion, and the perpendicular direction to the extending direction of the handle portion at the second constricted portion. The toothbrush according to any one of claims 1 to 6, wherein a distance from a position of a minimum diameter of a simple cross section is 10 to 30 mm.
The toothbrush according to any one of claims 1 to 7, wherein a distance from a surface having a maximum cross-sectional diameter perpendicular to the extending direction of the handle portion in the enlarged diameter portion to a tip of the head portion is 80 to 120 mm.