KR102237310B1 - Tooth brush - Google Patents

Abstract

A toothbrush comprising a handle portion, a neck portion extended to the handle portion, and a head portion provided at a tip end of the neck portion, wherein a plurality of hair bundles are planted on a hair transplant surface of the head portion, wherein the handle portion includes an extension direction of the handle portion A toothbrush, characterized in that at least two constricted portions that are gradually reduced and subsequently enlarged from the rear end toward the neck portion are formed in a cross section perpendicular to the neck portion.

Description

Toothbrush {TOOTH BRUSH}

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

In general, as a method of holding a toothbrush, a pen grip type and a palm grip type are known.

The pen grip type is similar to the gripping method of a pen or the like when taking notes, as shown in FIG. 3. The pen grip type is suitable for finely manipulating the brush part in the oral cavity.

As a toothbrush suitable for the pen grip type, it is located close to the junction with the neck, and has an oval shape, a long hole type, or a corner pole in four places on the hair-growing side, the back side, and both sides of the outer peripheral surface of the handle part. A toothbrush having a rounded rectangular shape has been proposed, and the cross-sectional shape of the handle portion of the portion in which the recess is formed is a roughly square toothbrush with rounded corners (for example, Patent Document 1).

In the palm grip type, as shown in Fig. 4, while surrounding the handle portion with a palm and a finger, the thumb is held on the handle portion. In the palm grip type, it is easy to grasp the handle portion vigorously, and when cleaning the oral cavity, it is easy to apply a strong abrasion force. For example, most of the infants grasp the handle part and operate the toothbrush in a form similar to the palm grip type.

As a toothbrush suitable for the palm grip type, a recess is provided one by one on the hair transplanting side and the back side at the position of the handle close to the junction with the neck, and both sides of the handle are also handled rather than the center of the bonus. A toothbrush has been proposed in which grooves are formed facing each other so as to have a center in the rear end direction, and the shape of the recesses is either an oval shape, a long hole shape, or a rectangular shape with rounded corners (e.g. , Patent Document 2).

For example, in intraoral cleaning for infants and toddlers who are inexperienced in oral cleaning techniques, an adult (e.g., a parent) may use a child's toothbrush after the infant grasps himself and handles the child's toothbrush. In many cases, the brush is gripped and manipulated in a pen grip to perform the finishing brushing.

Since adults and children have different sizes of hands and different gripping methods, toothbrushes for children are difficult to handle in either of the two.

For such a problem, the cross-sectional shape near the center of the gripping portion is approximately octagonal, and in this octagonal cross-section, the width of the horizontal surface of the upper and lower two sides parallel to the planting surface of the head portion is A toothbrush in which a cross-sectional shape of the entire gripping portion is formed so as to gradually widen continuously and gradually from one side of the rear end of the branch to the other end has been proposed (for example, Patent Document 3).

Patent Document 1: Japanese Unexamined Patent Publication No. 2000-125937 Patent Document 2: Japanese Unexamined Patent Publication No. 2000-189250 Patent Document 3: Japanese Unexamined Patent Publication No. 2000-262329

However, as a toothbrush for children, it is required to be easier to handle for both adults and children. That is, even for users who are inexperienced in their own oral cavity cleaning technology, and for users who perform finishing wiping of others, a toothbrush that is easy to handle is required.

Accordingly, an object of the present invention is to provide a toothbrush that is easy to handle, both for users who are inexperienced in their own oral cavity cleaning technology, and for users who have finished wiping by others.

The toothbrush of the present invention is a toothbrush having a handle portion, a neck portion extended to the handle portion, and a head portion provided at a tip end of the neck portion, and a plurality of hair bundles are planted on the hair transplant surface of the head portion, The handle portion is characterized in that at least two constricted portions are formed in two or more places, which are gradually reduced from the rear end toward the neck portion and subsequently enlarged.

The front end of the neck portion refers to a portion of the neck portion that is opposite to the side where the handle portion is present.

It is preferable that the said constriction part is covered with a soft resin. Further, it is preferable that a region not covered with the soft resin is formed between any of the constrictions and the constriction adjacent to the constriction.

The toothbrush of the present invention is easy to handle, both for users who are inexperienced in their own oral cavity cleaning technology, or for users who perform finishing wiping by others.

1 is a plan view of a toothbrush according to a first embodiment of the present invention as viewed from above in a vertical direction when the toothbrush is left standing with the hair transplanting surface facing up.
Fig. 2 is a side view of the toothbrush according to the first embodiment of the present invention as viewed from the horizontal direction when the toothbrush is left standing with the hair transplanting surface facing upward.
Fig. 3 is a diagram showing a method of holding a toothbrush by a pen grip type.
Fig. 4 is a diagram showing a method of gripping a toothbrush by a palm grip type.

The toothbrush of the present invention has a constricted portion 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. 1 to 2.

The toothbrush 1 of Figs. 1 to 2 includes a long handle portion 6, a neck portion 4 extended to the handle portion 6, and a head portion 2 provided at the tip of the neck portion 4 The handle body is integrally molded, and a plurality of hair bundles 22 planted on the hair transplanting surface 20 of the head portion 2.

The head portion 2 is rectangular in plan view in which the extending direction of the handle body is a long side. In the present specification, the term “rectangular shape” is a concept including a shape formed by cutting corners in a curved or straight line in a rectangular shape and a rectangular shape. On the hair transplant surface 20, 16 hair bundles 22 bounding a plurality of hairs are planted in a zigzag shape. In the present specification, the direction in plan view refers to the direction viewed from above in the vertical direction when the toothbrush is left standing with the hair transplant surface 20 facing upward.

The handle portion 6 is, from the rear end 8 toward the neck portion 4, the rear portion 60, the first constricted portion 62, the enlarged diameter portion 64, and the second constricted portion ( 66) and the front portion 68 are formed in this order.

The boundary between the first constricted portion 62 and the rear portion 60 is, for example, a cross-section perpendicular to the extending direction of the handle portion 6 from the rear portion 60 (also referred to as a cross-sectional surface) takes the maximum diameter. It refers to the position closest to the first narrow part. The boundary between the first constricted portion 62 and the diameter enlarged portion 64 is, for example, a cross section (also referred to as a cross-sectional surface) perpendicular to the extending direction of the handle portion 6 in the first constricted portion 62. It refers to a position between the position at which the minimum diameter is taken and the position at which the cross section perpendicular to the extending direction of the handle part 6 in the enlarged diameter part 64 (also referred to as a cross section) takes the largest diameter.

The boundary between the second constriction 66 and the diameter expansion unit 64 is, for example, a cross section perpendicular to the extending direction of the handle 6 in the second constriction 66 (also referred to as a transverse section). It refers to a position between the position at which the minimum diameter is taken and the position at which the cross section perpendicular to the extending direction of the handle part 6 in the enlarged diameter part 64 (also referred to as a cross section) takes the largest diameter.

The boundary between the second constricted portion 66 and the front portion 68 is, for example, a cross-section perpendicular to the extending direction of the handle portion 6 from the front portion 68 (also referred to as a cross-sectional surface) takes the maximum diameter. Say the location.

The rear portion 60 has a substantially circular columnar cross-section (transverse cross-section) perpendicular to the extending direction of the handle portion 6, and the rear end 8 is rounded. The approximate circle is not limited to a true circle or an ellipse, and includes a shape formed by only a curve in which the outline of a 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 portion 60a is formed on the front surface (the surface on the side of the hair transplanting surface 20) and the rear surface (the surface on the side opposite to the hair transplantation surface 20) of the rear portion 60. That is, in the cross section of the rear portion 60, portions corresponding to the front and rear surfaces of the handle body are straight lines. By forming the flat portion 60a, the toothbrush 1 can be prevented from rolling, and it is possible to attach threads such as characters without bending them.

On the side surface of the rear portion 60, a rectangular protrusion 61 is formed in a side view. This protrusion 61 acts as an anti-slip. The side surface of the rear portion 60 refers to a surface in which the toothbrush is viewed from the horizontal direction when the toothbrush is left standing with the hair transplant surface 20 on top, and the rear end 8 is excluded.

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

The diameter expansion portion 64 is a portion expanded from the first constriction portion 62 and is a substantially cylindrical portion positioned between the first constriction portion 62 and the second constriction portion 66. In the present embodiment, a flat portion 64a is formed on the rear surface of the diameter expansion portion 64 (the surface opposite to the hair transplant surface 20). By forming the flat portion 64a, it is possible to prevent the toothbrush 1 from rolling.

A cross section (also referred to as a transverse cross section) of the second constriction 66 with respect to the extending direction of the handle portion 6 is gradually reduced from the enlarged diameter portion 64 toward the neck portion 4 and subsequently expanded. . The second constricted portion 66 has a circular cross section and is recessed in, for example, an arc shape in plan view and side view. On the side surface of the second constriction 66, a rectangular protrusion 67 is formed in the side view.

This protrusion 67 acts as an anti-slip. In the present embodiment, it is preferable that the cross section of the second constriction 66 is similar to or congruent with the transverse section of the first constriction 62.

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

The neck portion 4 is in a cross-section (also referred to as a cross-sectional surface) perpendicular to the extending direction of the neck portion 4 from the front end of the front portion 68 toward the head portion 2, and has, for example, approximately the same diameter. It is addressed and reaches the head part (2). In the present embodiment, it is preferable that the cross section (also referred to as a cross section) of the neck portion 4 perpendicular to the extending direction of the handle portion 6 is similar to or congruent with the cross section of the front portion 68.

In the present embodiment, the handle body includes a substrate made of a hard resin, and a covering portion 70 in which the substrate is coated 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 constriction 62 and the second constriction 66 are covered with a soft resin. In this embodiment, the covering portion 70 is formed by circling the first constriction portion 62 and the second constriction portion 66.

In the diameter expansion part 64, the base body is exposed, and an elliptical exposed part 72 is formed in plan view. This exposed portion 72 is formed on the front and back of the handle body in a region including a position at which the cross-section perpendicular to the extending direction of the handle portion 6 in the diameter expansion portion 64 (also referred to as a cross-sectional surface) takes the maximum diameter. Has been.

As the material of the base material, a hard resin having a flexural modulus (JIS K7203) of 500 to 3000 MPa is exemplified.

Examples of the hard resin include polycyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate (PET), polystyrene (PS), acrylonitrile-butadiene-styrene resin (ABS), polycarbonate (PC), And 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 combination of two or more.

The material of the covering portion 70 is a soft resin. It is preferable that the soft resin can be deformed by a pressing force of a finger. 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 (eg, olefin elastomers, styrene elastomers, polyester elastomers, polyurethane thermoplastic elastomers, etc.) and silicones. Shore hardness is a value obtained by loading a sample with a test load that changes corresponding to the depth of the depression using an indenter and obtained from the depth of the depression (h), and the method described in JIS K 7215 It is measured by

In addition, the soft resin may contain an adhesion modifier, a plasticizer, or the like as necessary.

The size of the head portion 2 is appropriately determined in response to the person who is cleaning the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the size of the head portion 2 is preferably 8 to 11 mm in width and 13 to 22 mm in length, for example. It is the distance from the front end of the head part 2 to the rear end of the hair bundle at the rearmost end of the hair bundles 22, and from the tip of the head part 2 to the rear end of the hair bundle at the rearmost end of the hair bundles 22 The distance of is preferably 12 to 20 mm, for example.

The thickness of the head portion 2 is appropriately determined in response to the person who is cleaning the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the thickness of the head 2 is preferably 2.6 to 5 mm, for example.

The width of the head portion 2 is a horizontal direction when the toothbrush is left standing with the hair transplanting surface of the head portion 2 facing upward, and is the maximum length in the vertical direction with respect to the extending direction of the handle portion 6. The distance from the front end of the head portion 2 to the rear end of the hair bundle at the rearmost end of the hair bundles 22 is the horizontal direction when the toothbrush is left standing with the hair transplanting surface of the head portion 2 upward, while the handle portion 6 ) Is the maximum length in the direction parallel to the extension direction.

The length of the toothbrush 1, that is, the length of the handle body, is appropriately determined in response to a person who is cleaning the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the length of the handle body is, for example, preferably 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 bundles 22 may have a columnar shape or a prismatic shape.

The length (hair length) from the hair transplant surface 20 to the tip end of the hair bundle 22 is determined in consideration of the hair elasticity obtained from the hair bundle 22, for example, 6 to 13 mm is preferred.

The thickness (hair bundle diameter) of the hair bundles 22 on the hair transplant surface 20 is determined in consideration of the hair elasticity obtained from the hair bundles 22, and is preferably 1 to 2 mm, for example. In the case where the hair bundles 22 have a polygonal column shape, the hair bundle diameter is the diameter of the circumscribed circle of a cross-section of the hair bundles 22, that is, a cross section parallel to the extending direction of the handle portion 6.

As the hairs constituting the hair bundle 22, for example, the hairs whose diameter gradually decreases toward the bus bar, and the hairs in which the bus bar has been sharpened (taper hair), and the hairs having almost the same diameter toward the bus bar from the hair follicle surface 20 (Straight hair), etc. are mentioned. Examples of the straight hair include those in which the face made of the hairline is a plane substantially parallel to the hair transplanting surface 20, and the face made of the hairline is rounded in a hemispherical shape, for example.

The length (hair length) from the hair transplant surface 20 to the tip end of the hair bundles 22 refers to the maximum distance from the surface where the hair bundles 22 of the hair transplant surface 20 are planted to the tip of the hair bundles.

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), 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 alone or in combination of two or more.

Further, examples of the hair include a hair made of polyester having a multi-core structure having a core portion and at least one or more shell portions provided outside the core portion.

The shape of the cross-section of the feature, that is, the shape of the cross-section parallel to the extending direction of the handle portion 6 is not particularly limited, and is round, polygonal, shaped, and three-leaf clover such as a round shape or an ellipse. A type, a four-leaf clover type, etc. may be used. The cross-sectional shape of all features may be the same or different.

The thickness of the hair can be determined in consideration of the material and the like, and 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 the feeling of use, a feeling of deterioration, a cleaning effect, and durability, a plurality of features having different thicknesses may be arbitrarily combined and used.

In this embodiment, it is preferable that the maximum diameter of each cross section in the rear part 60, the diameter expansion part 64, and the front part 68 is the same. Same means that the difference in diameter is within ±1%.

The maximum diameter R1 of the cross section of the rear part 60 is appropriately determined in response to the person who is cleaning the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the maximum diameter R1 is preferably 10 to 14 mm, more preferably 11 to 12 mm. If it is more than the said lower limit, it is easy for a child to hold the handle part 6, and if it is less than the said upper limit, an adult grips the handle part 6 with a pen grip type, and it is easy to operate the toothbrush 1.

In addition, when the cross section of the handle body is other than a round shape, 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 first constriction 62 and the second constriction 66 The minimum diameter of the cross section of ), 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 the circumscribed circle in the cross section.

The minimum diameter R2 of the cross section in the first constriction 62 is appropriately determined in response to the person who is cleaning the oral cavity with the toothbrush 1. If the toothbrush 1 is for children, the minimum diameter R2 is preferably 8 to 12 mm, more preferably 9 to 10 mm. If it is within the above range, it is easy for an adult to hold the handle portion 6 in a pen grip manner and to operate the toothbrush 1.

The preferred range of the minimum diameter of the cross section in the second constriction 66 is the same as the minimum diameter of the transverse section of the first constriction 62. In this embodiment, the minimum diameter R2 of the first constriction 62 and the minimum diameter of the second constriction 66 may be the same or different, but they are the same from the viewpoint of easier handling. This is desirable.

The degree of constriction of the first constriction 62, that is, the depth of constriction (D1) represented by (R1-R2)/2, is appropriately determined in accordance with the subject who is cleaning the oral cavity with the toothbrush (1). do. If the toothbrush 1 is for children, the depth D1 is preferably 1 to 2 mm. If it is within the above range, when an adult grips with a pen grip, fingers are not tired.

The portion of the first constriction 62 to be constricted is a shape formed by combining two or more of a radius of curvature of R25 to 55mm or a radius of curvature of R25 to 55mm. As an aspect of the present invention, a portion to be cut off of the first constricted portion 62 is a shape formed by successively combining the radius of curvature of R51mm and R53mm.

In addition, from the position at which the cross section perpendicular to the extending direction of the handle portion 6 in the first constricted portion 62 (also referred to as a cross section) takes the minimum diameter, the handle portion 6 is extended from the diameter enlarged portion 64. The shortest distance to the position at which the cross section perpendicular to the direction (also referred to as a cross section) takes the maximum diameter is preferably 5 to 25 mm, more preferably 10 to 20 mm. From the position where the cross section (also referred to as the cross section) perpendicular to the extending direction of the handle portion 6 at the first constriction 62 takes the minimum diameter, from the front portion 68 to the extending direction of the handle portion 6 It is preferable that it is 5 to 25 mm, and it is more preferable that it is 10 to 20 mm, and the shortest distance to the position where the cross section perpendicular|vertical to the cross section (it is also called a cross section) takes a maximum diameter.

The degree of constriction of the second constriction 66 may be the same as or different from the degree of constriction of the first constriction 62, but the degree of constriction of the first constriction 62 and It is preferable to be the same.

That is, the portion of the second constricted portion 66 to be cut is a shape formed by combining two or more of a radius of curvature of R25 to 55mm or a radius of curvature of R25 to 55mm. As an aspect of the present invention, the portion of the second constriction 66 to be constricted is a shape constituted by successively combining the radius of curvature of R25mm and R48mm.

Further, in the second constricted portion 66, at a position in which the cross-section perpendicular to the extending direction of the handle portion 6 (also referred to as a cross-sectional surface) takes the minimum diameter, the extension of the handle portion 6 from the diameter expansion portion 64 The shortest distance to the position at which the cross section perpendicular to the direction (also referred to as a cross section) takes the maximum diameter is preferably 5 to 25 mm, more preferably 10 to 20 mm. The extending direction of the handle portion 6 from the rear portion 60 from the position at which the cross-section perpendicular to the extending direction of the handle portion 6 in the second constricted portion 66 (also referred to as a cross-section) takes the minimum diameter. It is preferable that it is 5 to 25 mm, and it is more preferable that it is 10 to 20 mm as for the shortest distance to the position where the cross section perpendicular|vertical with respect to (it is also called a cross section) takes a maximum diameter.

The degree of constriction of the first constriction 62 and the degree of constriction of the second constriction 66 may be the same or different, but are preferably the same from the viewpoint of easier handling. .

The distance L1 between the position of the minimum diameter of the cross section in the first constriction 62 and the position of the minimum diameter in the cross section in the second constriction 66 is a toothbrush 1 to clean the oral cavity. It is appropriately determined according to the subject As one aspect of the present invention, if the toothbrush 1 is for children, the distance L1 is 10 to 20 mm. Further, if the toothbrush 1 is for children, as another aspect of the present invention, the distance L1 is 10 to 30 mm, and as another aspect of the present invention, the distance L1 is 20 to 30 mm. If it is within the above range, it is easy for the infant to grasp the enlarged neck 64 and grip it.

The distance L2 from the tip of the head portion 2 to the center of the diameter-expansion portion 64 is appropriately determined in response to a person who is cleaning 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 within the above range, it is easy for the child to grasp the enlarged neck 64 and to operate the toothbrush 1. The distance L2 from the tip of the head portion 2 to the center of the enlarged portion 64 is the distance from the surface at which the diameter of the cross section in the enlarged portion 64 becomes the largest to the tip of the head portion 2 Say.

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 can be obtained by a conventionally known manufacturing method. An example of a method for manufacturing the toothbrush 1 will be described.

The manufacturing method of this example comprises a primary molding process in which a resin constituting a base is injected into a primary mold to obtain a base, and the base is placed in a secondary die, and the covering portion 70 is formed in that state. It has a secondary molding process of injecting resin into the secondary mold, and a planting process of planting the hair bundles 22 on the hair transplanting surface 20 of the head portion 2.

In the primary molding step, a known injection molding method is applied to obtain a base having a recessed portion corresponding to the covering portion 70.

In the secondary molding process, a base is placed in the secondary mold, and subsequently, resin constituting the covering portion 70 is injected into the secondary mold to form the covering portion 70 to obtain a handle body. At this time, by setting the structure in which the exposed portion 72 is formed, the base body can be satisfactorily fixed in the secondary mold.

Subsequently, the toothbrush 1 can be obtained by planting the hair bundles 22 on the hair transplanting surface 20 of the obtained handle body. As a method of planting the hair bundles 22, for example, the hair bundles are folded into two, and a flat wire sandwiched between them is typed into the hair transplant hole so that the hair bundles are planted, and the lower end of the hair bundles is melted to become the hair growth part. And a thermal fusion method in which a resin is press-fitted and fixed, and an in-mold method in which a molten resin is injected into a mold after forming a molten mass by heating the lower end of the hair bundle to shape the hair transplant.

Next, the method of using the toothbrush 1 will be described taking the case of cleaning the oral cavity of a child or child as an example.

First, the infant is grasping and grasping an arbitrary position of the handle part 6, and cleans his or her oral cavity. At this time, by holding the handle portion 6 centered on the diameter expansion portion 64, the infant can grip the handle portion 6 vigorously and operate the toothbrush 1. In addition, since the exposed portion 72 exposed by the hard resin is formed in the diameter expansion portion 64, the infant and child can hold the handle portion 6 more vigorously.

Subsequently, when an adult performs the final wipe of the infant's oral cavity, a finger is placed on the first constricted portion 62 or the second constricted portion 66, and the handle portion 6 is held in a pen grip manner. 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 first constriction 62 and the second constriction 66 are formed in the handle part 6, it is possible to select an appropriate gripping position according to the portion to be cleaned, such as incisors and molars. In addition, since the covering portion 70 is formed in the first constricted portion 62 and the second constricted portion 66, the finger gripping the handle portion 6 is not tired, and the finger slips. It's hard to lose.

As described above, in the toothbrush 1 of the present embodiment, the first constriction 62 and the second constriction 66 are formed in the handle part 6, and the first constriction 62 Since the gap between the and the second constriction 66 is the enlarged diameter portion 64, it is easy to handle even for a user who is inexperienced with the cleaning technique in his/her oral cavity or for a user who performs finishing wiping by another person.

The toothbrush 1 of this embodiment is suitable as a toothbrush for children, especially for infants.

The present invention is not limited to the above-described embodiment.

In the above-described embodiment, the constriction portion is formed in two places of the handle portion, but the present invention only needs to have the constriction portion formed in two or more places. However, if there are too many constrictions, there is a fear that the length of the toothbrush becomes excessively long and difficult to handle, or the distance between the constrictions becomes too short, making it difficult to grasp and grip. For this reason, 2 to 3 places of the constricted part are preferable.

In the above-described embodiment, the maximum diameters of the cross-sections of the front portion, the diameter expansion portion, and the rear portion are the same, but the present invention is not limited to this, and the maximum diameters of the front portion, the diameter expansion portion, and the rear portion may be different from each other. However, from the viewpoint of being able to grip the handle portion more vigorously by a grip or palm grip type, it is preferable that at least the maximum diameter of the cross section of the enlarged diameter is the maximum diameter of the cross section of the handle portion, and the cross section of the front, enlarged and rear It is more preferable that the maximum diameter of is equal to each other.

In the above-described embodiment, the cross section of the handle portion is generally circular, but the present invention is not limited to this, and the cross section of the handle portion may be a schematic polygon. The schematic polygon is a concept including a curved edge formed at each top and a part of the side formed in an arc.

In the above-described embodiment, the cross sections of the neck portion, the front portion, the diameter-expanding portion, the constriction portion, and the rear portion are all roughly circular, but the present invention is not limited thereto. For example, the cross section of any one of the neck portion, the front portion, the diameter expansion portion, the constriction portion, and the rear portion may be a rough polygon.

In the above-described embodiment, flat portions are formed on the front and back of the rear portion, but the present invention is not limited to this, and the flat portion may be formed only on either one of the front and back of the rear portion, and the flat portion may not be formed.

In the above-described embodiment, a flat portion is formed on the back surface of the diameter expansion portion, but the present invention is not limited to this, and a flat portion may be formed on the surface of the diameter expansion portion, and a flat portion may be formed on the front and back of the diameter expansion portion, It is not necessary to form a flat portion in the enlarged portion.

In the above-described embodiment, the constriction portion is coated with a soft resin to form the covering portion, but the present invention is not limited to this, and the covering portion may not be formed, and the covering portion may be formed in addition to the constriction portion. When gripping the handle portion by the pen grip type, in order to make the finger less tired and the finger less slippery, it is preferable that the covering portion is formed in the region including the constriction portion.

In the above-described embodiment, the protrusions are formed on both the first and second constrictions, but the present invention is not limited thereto, and the protrusion may be formed only on one of the first and second constrictions. The protrusions may not be formed in the first and second constrictions.

In the above-described embodiment, the protrusion is formed in the rear portion, but the present invention is not limited to this, and the protrusion does not need to be formed in the rear portion.

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

In the above-described embodiment, 16 hair bundles are planted on the hair transplant 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 zigzag shape, but the present invention is not limited to this, and the arrangement pattern of the hair bundles may be any.

[Industrial availability]

The toothbrush of the present invention is easy to handle, both for users who are inexperienced in their own oral cavity cleaning technology, or for users who perform finishing wiping by others. Therefore, the present invention can be suitably used as a "toothbrush" and is extremely important in industry.

1: toothbrush 2: head
4: neck portion 6: handle portion
8: rear end 20: hair transplant surface
22: hair bundle 62: first narrow portion
64: enlarged portion 66: second narrow portion
70: covering portion 72: exposed portion

Claims (8)

A toothbrush comprising a handle portion, a neck portion extended to the handle portion, and a head portion provided at a tip end of the neck portion, wherein a plurality of hair bundles are planted on the hair transplant surface of the head portion,
The handle portion is formed in two or more places gradually reducing the diameter toward the neck from the rear end and then expanding the diameter,
The handle portion has a portion coated with a soft resin and a portion not covered with a soft resin,
Toothbrush, characterized in that at least the constricted portion is covered with a soft resin. A toothbrush comprising a handle portion, a neck portion extended to the handle portion, and a head portion provided at a tip end of the neck portion, wherein a plurality of hair bundles are planted on the hair transplant surface of the head portion,
The handle portion is formed in two or more places gradually reducing the diameter toward the neck from the rear end and then expanding the diameter,
The constricted portion is coated with a soft resin,
A toothbrush, wherein a region not covered with the soft resin is formed between any of the constrictions and the constriction adjacent to the constriction. The method according to claim 1 or 2,
The toothbrush, characterized in that the first constricted portion 62 has a shape formed by combining two or more of a radius of curvature of R25 to 55mm or a radius of curvature of R25 to 55mm. The method according to claim 1 or 2,
From the position in which the cross section perpendicular to the extending direction of the handle part 6 at the first constricted part 62 takes the minimum diameter, the cross section perpendicular to the extending direction of the handle part 6 at the enlarged diameter part 64 is A toothbrush, characterized in that the shortest distance to the position at which the maximum diameter is taken is 10 to 20 mm. The method according to claim 1 or 2,
A toothbrush, characterized in that the first constriction has a constriction depth of 1 to 2 mm. The method according to claim 1 or 2,
The position of the smallest diameter of the cross section perpendicular to the extending direction of the handle part in the first constriction, the position of the smallest diameter of the cross section perpendicular to the extending direction of the handle part in the second constriction, and Toothbrush, characterized in that the distance is 10 to 30 mm. The method according to claim 1 or 2,
A toothbrush, characterized in that a distance from a surface in which a diameter of a cross section perpendicular to the extending direction of the handle part is maximized in the diameter expansion part to a tip end of the head part is 80 to 120 mm. delete

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