WO2019026685A1

WO2019026685A1 - Toothbrush

Info

Publication number: WO2019026685A1
Application number: PCT/JP2018/027674
Authority: WO
Inventors: 紗弥野澤; 小林　海之; 将嗣北原
Original assignee: ライオン株式会社
Priority date: 2017-07-31
Filing date: 2018-07-24
Publication date: 2019-02-07
Also published as: KR102625898B1; CN110267566A; CN110267566B; TWI763892B; TW201909790A; JP6983568B2; KR20200034658A; JP2019025028A

Abstract

The purpose of the present invention is to provide a toothbrush that has high graspability of the handle part without increasing cost. A handle part (30) has: a first expanded part (41), the length of which in the width direction is at a maximum at a first position (P1) in the length-axis direction; a first constricted part (43), the length of which is at a minimum at a second position (P2) closer to the rear-end side than the first expanded part; a second expanded part (42), the length of which is at a maximum at a third position (P3) closer to the rear-end side than the first constricted part; and a second constricted part (44), the length of which is at a minimum at a fourth position (P4) closer to the rear-end side than the second expanded part. When the minimum length of the first constricted part is defined as PW2 and the maximum length of the second expanded part is defined as PW3, PW3 is 15-20 mm and PW3/PW2 is 1.3-1.5. When the thickness at the first position is defined as PT1 and the thickness at the third position is defined as PT 3, PT 3 is 15-20 mm, and PT3/PT1 is 1.7-2.5.

Description

toothbrush

The present invention relates to a toothbrush.
Priority is claimed on Japanese Patent Application No. 201-147972, filed July 31, 2017, the content of which is incorporated herein by reference.

Heretofore, in order to be able to achieve oral cleaning all over the place, compacting of the hair-implanted part has generally been focused on operability in the oral cavity. However, when performing oral cavity cleaning in a compact flocking area, it required skill and time for cleaning. Then, although the toothbrush which has a head (wide head) of a type in which the flocked part is enlarged is developed, it is pointed out that it is difficult for the brush part to properly reach the cleaning site because the flocked part has a wide design. .

Patent Document 1 discloses a wide head type toothbrush having a high cleaning property, capable of simultaneously cleaning a plurality of cleaning sites by devising a brush type and an arrangement.

JP, 2016-209616, A

However, with the conventional wide-head type toothbrush as described above, although the cleaning performance is improved to some extent, the interference of the hair bundle when it abuts against the cleaning site is large, so that the gripped handle portion is cluttered and stable cleaning There is a possibility of hindrance. It is also conceivable to provide a soft portion such as rubber on the surface of the handle portion, for example, in order to improve the grip performance by improving the handleability and slipperiness of the handle portion.

However, in this case, in addition to the need to use a plurality of types of resins, it is necessary to manufacture the handle portion by two-color molding or the like, which causes a problem of an increase in cost. Such problems may occur not only in the wide head specification but also in the compact specification head.

The present invention has been made in consideration of the above-described points, and an object of the present invention is to provide a toothbrush having a high gripping property to the handle portion without increasing the cost.

According to the first aspect of the present invention, there is provided a head portion disposed on the tip end side in the long axis direction and having a hair bundle implanted on the flocked surface, and a neck portion extended on the rear end side of the head portion. And a handle portion extended to the rear end side of the neck portion, the handle portion being disposed on the rear end side with respect to the neck portion and having the length as viewed from the front direction orthogonal to the flocked surface A first bulging portion that continuously and squeezes continuously and symmetrically on both sides in the axial direction and a width direction orthogonal to the front direction, and the first bulging portion is disposed closer to the rear end than the first bulging portion, and the width A first constriction portion which continuously and continuously changes in a symmetrical manner on both sides in the direction, and a portion which is disposed on the rear end side with respect to the first constriction portion and continuously and symmetrically changes on both sides in the width direction A second bulging portion that protrudes and the second bulging portion are disposed closer to the rear end than the second bulging portion, and are continuously and symmetrically changed on both sides in the width direction. And the first bulging portion has a maximum length in the width direction at a first position between the neck portion and the first narrowing portion in the long axis direction. The first narrowed portion has a minimum length in the width direction at a second position between the first bulging portion and the second bulging portion in the long axis direction, and the second bulging portion The length in the width direction is maximized at a third position between the first constricted portion and the second constricted portion in the long axis direction, and the second constricted portion corresponds to the second in the long axis direction. The length in the width direction is minimized at the fourth position on the rear end side of the bulging portion, and the length in the width direction of the first narrowed portion at the second position is PW2, and the length at the third position is Assuming that the length in the width direction of the second bulging portion is PW3, the PW3 is 15 mm or more and 20 mm or less, and the PW is / PW2 is not less than 1.3 and not more than 1.5, and let PT1 be the thickness in the front direction at the first position be PT1, and let PT3 be the thickness in the front direction at the third position be PT3 , 15 mm or more and 20 mm or less, and PT3 / PT1 is 1.7 or more and 2.5 or less.

In the toothbrush according to one aspect of the present invention, the first bulging portion, the first narrowing portion, the second bulging portion, and the second narrowing portion each have a contour line in the front view that is long in the front view. It is characterized in that it is formed by a curve circumscribing each other with an axially adjacent bulging portion or constricting portion.

Further, in the toothbrush according to one aspect of the present invention, the cross-sectional shape of the handle portion at the first position is a flat shape whose length in the width direction is larger than a thickness in the front direction, and the third position The cross-sectional shape of the handle portion in is preferably substantially circular.

Further, in the toothbrush according to the aspect of the present invention, at least one of the front side and the back side of the handle portion at the first position is characterized by having a groove.

Further, in the toothbrush according to one aspect of the present invention, the groove is formed in an annular shape.

Further, in the toothbrush according to one aspect of the present invention, the maximum length of the head portion in the width direction is 13 mm or more.

According to the present invention, it is possible to provide a toothbrush having a high gripping property to the handle portion without increasing the cost.

It is a figure which shows embodiment of this invention, Comprising: It is a front view of the toothbrush 1. FIG. FIG. 2 is a side view of the same toothbrush 1; It is a rear view of the same toothbrush 1. FIG. It is sectional drawing of the handle part 30 cut | disconnected in 1st position P1. It is the side view which expanded 1st position P1 in FIG. It is sectional drawing of the handle part 30 cut | disconnected in 3rd position P3. It is the side view which expanded the rear end of the handle part 30 containing 4th position P4.

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 7.
The present embodiment will be described using an example of a wide head type toothbrush in which the width of the head portion is increased.

The following embodiment shows one aspect of the present invention, does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure intelligible, the scale, the number, etc. in the actual structure and each structure are made different.

FIG. 1 is a front view of the toothbrush 1. FIG. 2 is a side view of the toothbrush 1. FIG. 3 is a rear view of the toothbrush 1.

The toothbrush 1 of this embodiment is disposed on the tip side in the long axis direction (hereinafter referred to simply as the tip side) and has a head portion 10 on which a hair bundle (not shown) of bristles is implanted and a length of the head portion 10 A neck portion 20 extending to the axial rear end side (hereinafter simply referred to as the rear end side) and a handle portion 30 extending to the rear end side of the neck portion 20 (hereinafter the head portion 10 and the neck portion 20) And the handle portion 30 together to form a handle body 2).

The head portion 10 has a flocked surface 11 on one side in the thickness direction. Hereinafter, the flocked surface 11 side in the thickness direction is the front side in the front direction, the opposite side to the flocked surface 11 is the back side, and the direction orthogonal to the front direction and the long axis direction is the width direction. In the following description, the thickness in the front direction is simply referred to as thickness. Plural flocking holes 12 are formed in the flocked surface 11. In the flocking hole 12, a tuft of hair (not shown) is implanted.

The head unit 10 is a wide wide head specification. The maximum width W1 of the head portion 10 is 13 mm or more and 16 mm or less. The length of the head portion 10 is not particularly limited, and for example, 10 mm or more and 33 mm or less is preferable. If the length of the head portion 10 is equal to or more than the above lower limit, the area for implanting the hair bundle can be sufficiently secured, and if it is equal to or less than the above upper limit, operability in the oral cavity can be further enhanced.

Among the plurality of flocked holes 12, the distance between the most distal end side of the head portion 10 and the tip of the head portion 10, and the flocked hole 12 and head portion 10 positioned most on the rear end side of the head portion 10. The distance to the rear end of is set equal. In other words, assuming that the distance between the flocked hole 12 located on the most tip side of the head 10 and the tip of the head 10 is d, the boundary position between the head 10 and the neck 20 is the most rear end of the head 10 It is a position away from the flocking hole 12 located on the side to the rear end side by a distance equal to the distance d.

The thickness of the head portion 10 can be determined in consideration of the material of the handle body 2 and the like, and is preferably 2.0 mm or more and 6.0 mm or less, and more preferably 3.0 mm or more and 5.0 mm or less. If the thickness is equal to or more than the lower limit, the strength of the head portion 10 can be further enhanced. If the thickness is equal to or less than the upper limit, reachability to the back of the back tooth can be enhanced and operability in the oral cavity is further enhanced. Be

The length of the neck portion 20 is preferably 40 mm or more and 70 mm or less so that the neck portion 20 touches the lips when the head portion 10 is inserted into the oral cavity.
The minimum width and the minimum thickness of the neck portion 20 are preferably, for example, 3.0 mm or more and 6.0 mm or less. If it is above the above lower limit, the strength of the neck portion 20 is further enhanced, and if it is below the above upper limit, the lip is easy to close and the reachability to the posterior teeth can be enhanced, and the operability in the oral cavity is further enhanced. Be enhanced.
Although the boundary between the neck portion 20 and the handle portion 30 has a boundary 31 on the front side and a boundary 32 on the rear side (see FIG. 5) as described later, the length of the neck portion 20 is The boundary 31 on the front side is used for the position of the rear end side in the calculation.

As shown in FIG. 2, both the front side and the back side of the neck portion 20 extend substantially parallel to the flocked surface 11. The front side of the neck portion 20 has an arc-shaped curved contour 21 having a center of curvature on the front side in a side view and having an arc shape gradually going upward (front side) toward the rear end side. The back surface side of the neck portion 20 has a curved contour 22 having an arc shape having a center of curvature on the back surface side in a side view and gradually decreasing downward (back surface side) toward the rear end side.

As shown in the front view of FIG. 1 and the rear view of FIG. 3, the handle portion 30 has a first bulging portion 41 and a second bulging portion 41 whose lengths in the width direction vary continuously and symmetrically on both sides. The bulging portion 42, the first narrowing portion 43 and the second narrowing portion 44 in which the length in the width direction is continuously changed and narrowed symmetrically on both sides, and the through hole 46 disposed in the vicinity of the rear end doing. The first bulging portion 41, the first narrowing portion 43, the second bulging portion 42, and the second narrowing portion 44 are sequentially arranged along the long axis direction from the tip end side. Further, a groove 45A is formed on the front side of the handle portion 30, and a groove 45B is formed on the back side of the handle portion 30.

The first bulging portion 41 has the maximum length in the width direction at the first position P1 on the tip end side in the long axis direction. The first position P1 is a position where the length in the width direction of the first bulging portion 41 is maximum between the neck portion 20 and the first constricted portion 43 in the long axis direction. The first narrowed portion 43 has a minimum length in the width direction at a second position P2 which is disposed on the rear end side relative to the first position P1 in the long axis direction. The second position P2 is a position where the length in the width direction of the first constricted portion 43 between the first bulging portion 41 and the second bulging portion 42 in the major axis direction is minimized. The second bulging portion 42 has a maximum length in the width direction at a third position P3 disposed on the rear end side of the second position P2 in the long axis direction. The third position P3 is a position where the length in the width direction of the second bulging portion 42 between the first constricted portion 43 and the second constricted portion 44 in the major axis direction is maximized. The second narrowed portion 44 has a minimum length in the width direction at a fourth position P4 which is disposed on the rear end side relative to the third position P3 in the long axis direction. The fourth position P4 is a position where the length in the width direction of the second narrow portion 44 is minimum on the rear end side of the third position P3 in the long axis direction. That is, it is a position where a curve or a straight line whose width widens or a width changes to the same straight line from a curve or a straight line which forms both edges where the width becomes narrow at the third position P3.

The first bulging portion 41, the first narrowing portion 43, the second bulging portion 42, and the second narrowing portion 44 circumscribe each other with the bulging portion or the narrowing portion in which the outline of the front view is adjacent in the major axis direction It is formed of a gentle curve.

Specifically, the first bulging portion 41 has an arc-shaped curved contour C1 having a center of curvature on the center side in the width direction in a front view. The first narrow portion 43 has an arc-shaped curved contour C2 having a curvature center on the outer side in the width direction in a front view. The second bulging portion 42 has an arc-shaped curved contour C3 having a center of curvature on the center side in the width direction in front view. The second narrow portion 44 has an arc-shaped curved contour C4 having a curvature center on the outer side in the width direction in a front view. Each of the curved contours C1 to C4 circumscribes the adjacent curved contour in the long axis direction.

The handle portion 30 has a length in the width direction of the first bulging portion 41 (width at the first position P1) as PW1 and a length in the width direction of the first narrow portion 43 (width at the second position P2) as PW2 Assuming that the length in the width direction of the second bulging portion 42 (width at the third position P3) is PW3 and the length in the width direction of the second constricted portion 44 (width at the fourth position P4) is PW4. The following relations (1) and (2) are satisfied respectively.
PW3>PW1> PW2 (1)
PW3>PW4> PW2 (2)

The width PW1 at the first position P1 is preferably 14 mm or more and 17 mm or less.
The width PW2 at the second position P2 is preferably 11 mm or more and 14 mm or less.
The width PW3 at the third position P3 is preferably 15 mm or more and 20 mm or less.
The width PW4 at the fourth position P4 is preferably 12.5 mm or more and 15.5 mm or less.
The difference (PW1-PW2) of the widths of the first position P1 and the second position P2 is preferably 2.5 mm or more and 3.5 mm or less.
The difference (PW3-PW2) of the widths of the third position P3 and the second position P2 is preferably 4 mm or more and 5.5 mm or less.
The difference (PW4-PW2) of the widths of the fourth position P4 and the second position P2 is preferably 0.5 mm or more and 1.5 mm or less.
The PW3 / PW2 is preferably 1.3 or more and 1.5 or less.

As shown in FIG. 2, the front side of the handle portion 30 is disposed at the first position P1 and is disposed at the second position P2 and a curved contour C11 having a center of curvature on the front side in a side view. Arc-shaped curved contour C12 having a center of curvature on the front side in a visual manner, arc-shaped curved contour C13 having a center of curvature on the back side in a side view, and a fourth position P4 It has an arc-shaped curved contour C14 having a center of curvature on the front side in a side view, and an arc-shaped curved contour C15 having a center of curvature on the back side in a side view circumscribed to the curved contours C12 and C13. . The curved contours C12 to C15 circumscribe the adjacent curved contours in the long axis direction.

As shown in FIG. 2, the back side of the handle portion 30 is disposed at the first position P1 and is disposed at the second position P2 and a curved contour C21 having a center of curvature on the back side in side view Arc-shaped curved contour C22 having a center of curvature on the front side in a visual manner, arc-shaped curved contour C23 having a center of curvature on the front side in a side view, and a fourth position P4 It has an arc-shaped curved contour C24 having a center of curvature on the back side in a side view, and an arc-shaped curved contour C25 having a center of curvature on the front side in a side view circumscribed to the curved contours C22 and C23. . The curved contours C22 to C25 circumscribe the adjacent curved contours in the long axis direction.

Assuming that the thickness at the first position P1 is PT1, the thickness at the second position P2 is PT2, the thickness at the third position P3 is PT3, and the thickness at the fourth position P4 is PT4. The following relationships (3) and (4) are satisfied respectively.
PT3>PT2> PT1 (3)
PT3>PT4> PT1 (4)

The thickness PT1 at the first position P1 is preferably 6.5 mm or more and 9 mm or less.
The thickness PT2 at the second position P2 is preferably 9 mm or more and 11 mm or less.
The thickness PT3 at the third position P3 is preferably 15 mm or more and 20 mm or less.
The thickness PT4 at the fourth position P4 is preferably 10 mm or more and 13 mm or less.
The difference in thickness (PT2-PT1) between the first position P1 and the second position P2 is preferably 1.5 mm or more and 3.0 mm or less.
The difference in thickness (PT3-PT1) between the first position P1 and the third position P3 is preferably 5.5 mm or more and 9 mm or less.
The difference in thickness (PT4-PT1) between the first position P1 and the fourth position P4 is preferably 2.5 mm or more and 4.5 mm or less.
The PT3 / PT1 is preferably 1.7 or more and 2.5 or less.

The distance between the first position P1 and the third position P3 is preferably 30 mm or more and 60 mm or less. When the distance between the first position P1 and the third position P3 is less than the above lower limit value, the distance between the first position P1 and the third position P3 becomes short when the handle portion 30 is gripped, and the second position The last part of the thumb in contact with the front side of P2 and the index finger in contact with the second position P2 come close to each other, and there is a possibility that the auxiliary function when load is applied to the head unit 10 during cleaning may be degraded. In addition, it becomes difficult to distinguish between the first position P1 and the third position P3 in a tactile manner. When the distance between the first position P1 and the third position P3 exceeds the above-described upper limit value, the distance between the first position P1 and the third position P3 becomes longer when the handle portion 30 is gripped, and the first position When the front side of P1 is a finger rest of the last section of the thumb, the middle finger and the ring finger may abut in the circumferential direction at the third position P3 and it may be difficult to hold.

FIG. 4 is a cross-sectional view of the handle portion 30 cut at the first position P1.
As shown in FIG. 4, the cross-sectional shape of the handle portion 30 (first bulging portion 41) at the first position P <b> 1 is a flat shape in which the length in the width direction is larger than the thickness. On the front side of the handle portion 30, a groove 45A having a circular front view circularly formed centering on the center in the width direction at the first position is provided. On the back side of the handle portion 30, a groove 45B having a circular front view circularly formed centering on the center in the width direction at the first position is provided.

Further, as shown in FIG. 4, the front side of the handle portion 30 has an arc-shaped curved contour C <b> 31 having a center of curvature on the back side in the width direction. A groove 45A is provided on both sides of the curved contour C31, and the height T1 is formed with a level difference which is 0.5 to 1.5 mm lower.
Similarly, the back side of the handle portion 30 has an arc-shaped curved contour C32 having a center of curvature on the front side in the width direction. A groove 45B is provided on both sides of the curved contour C32, and the height T2 is formed with a step that is 0.5 to 1.5 mm lower.

FIG. 5 is an enlarged side view of the first position P1 in FIG.
The boundary 31 between the neck portion 20 and the handle portion 30 on the front side has the above-described curved contour 21 disposed closer to the tip than the boundary 31 and the above-described curved contour disposed closer to the rear than the boundary 31 in side view It is formed by the ridgeline of the location where C11 intersects. The position of the boundary 31 in the front direction, that is, the position where the curved contour C11 intersects the curved contour 21 is disposed on the front side of the position where the curved contour C11 intersects the curved contour C12. Therefore, on the front end side with respect to the first position P1 on the front side, a curved surface that protrudes more sharply than the rear end side with respect to the first position P1 is formed.

The height T3 of the groove 45A is formed with a step difference of 0.5 to 1.5 mm with respect to the tip end side in the long axis direction.
The height T4 of the groove 45A is formed with a step difference of 0.5 to 1.5 mm with respect to the rear end side in the long axis direction.

Similarly, the boundary 32 between the neck portion 20 and the handle portion 30 on the rear side is arranged on the curved contour 22 arranged on the tip side of the boundary 32 and on the rear side of the boundary 32 in side view It is formed of the ridgeline of the location which the said curve outline C21 cross | intersects. The position of the boundary 32 in the front direction, that is, the position where the curved contour C21 intersects the curved contour 22 is disposed on the back side of the position where the curved contour C21 intersects the curved contour C22. Therefore, on the front end side with respect to the first position P1 on the back side, a curved surface that protrudes more sharply than the rear end side with respect to the first position P1 is formed.

The height T5 of the groove 45B is formed with a step difference of 0.5 to 1.5 mm with respect to the tip end side in the long axis direction.
The height T6 of the groove 45B is formed with a step difference of 0.5 to 1.5 mm with respect to the rear end side in the long axis direction.

FIG. 6 is a cross-sectional view of the handle portion 30 cut at the third position P3.
As shown in FIG. 6, the cross-sectional shape of the handle portion 30 at the third position P3 is substantially circular. The maximum diameter of the handle portion 30 at the third position P3 is preferably 15 mm or more and 20 mm or less. When the maximum diameter of the handle portion 30 falls below the above lower limit, when the area around the third position P3 is gripped with a palm grip, the grip area is small and the middle finger and ring finger are not easily in contact and slip easily The gripability may be reduced. When the maximum diameter of the handle portion 30 exceeds the above-described upper limit value, when the area around the third position P3 is gripped with a palm grip, the circumferential length becomes large and it becomes difficult to grip.

FIG. 7 is an enlarged side view of the rear end of the handle portion 30 including the fourth position P4.
As shown in FIG. 7, a through hole 46 penetrating in the front direction is formed in the vicinity of the rear end portion of the handle portion 30. Further, as shown in FIGS. 1 and 7, on the front side of the handle portion 30, a groove portion 47 extending from the through hole 46 to the tip side is disposed. The groove portion 47 is formed to have a semicircular cross section and a depth of about 1 mm, for example.

Similarly, on the back side of the handle portion 30, a groove 49 extending from the through hole 46 to the fourth position P4 is disposed. The groove 49 is formed to have a semicircular cross section and a depth of about 1 mm, for example.

The length of the handle body 2 is not particularly limited, and is, for example, 100 to 200 mm. The handle body 2 is integrally formed in a long shape as a whole, and is obtained, for example, by injection molding using a resin as a material. Examples of the resin constituting the handle body 2 include resins having a flexural modulus (JIS 7171) of 1000 MPa or more and 2200 MPa or less, and examples thereof include polypropylene resin (PP), polyacetal resin (POM) and polystyrene resin (PS) Polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile butadiene styrene resin (ABS), polyarylate resin, polycarbonate resin, acrylonitrile styrene resin (AS), etc. may be mentioned. Among these, polypropylene resins, which are general purpose resins, are preferable in consideration of cost.

A hair bundle is a bundle of a plurality of bristles. The length (hair length) from the flocked surface 11 to the tip of the hair bundle can be determined in consideration of a hair waist or the like required for the hair bundle, and is, for example, 6 to 14 mm. All hair bundles may have the same hair length or may be different from each other.

The thickness (hair bundle diameter) of the hair bundle can be determined in consideration of the hair waist and the like required for the hair bundle, and is, for example, 1 to 3 mm. All hair bundles may have the same hair bundle diameter or may be different from each other.

For example, the diameter of the bristles gradually decreases toward the tip of the hair bundle, and the diameter of the tip of the bristle is sharpened (taper hair), the diameter from the flocked surface 11 to the tip of the bristle is about the diameter The same hair (straight hair) etc. are mentioned. Examples of straight hair include those in which the hair tips are flat surfaces substantially parallel to the flocked surface 11 and those in which the hair tips are rounded in a hemispherical shape.

The material of the hair is, for example, polyamide such as 6-12 nylon (6-12 NY), 6-10 nylon (6-10 NY), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT) And polyesters such as polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN); polyolefins such as polypropylene (PP); polyolefin elastomers; and elastomer resins such as styrene elastomers. These resin materials can be used singly or in combination of two or more. The bristles may be polyester bristles having a multi-core structure having a core portion and at least one or more layers of sheath portions provided outside the core portion.

The cross-sectional shape of the bristles is not particularly limited, and may be a circle such as a perfect circle or an oval, a polygon, a star, a three-leaf clover, a four-leaf clover, or the like. The cross-sectional shapes of all the bristles may be the same or different.

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

The handle body 2 in the toothbrush 1 of the said structure is shape | molded by the injection molding using the mold which has a space (cavity) of the shape and magnitude | size corresponding to the handle body 2, for example. A gate for injecting the molten resin into the mold is disposed, for example, at the rear end of the handle body 2. The molten resin injected from the gate is manufactured by filling the mold cavity and removing it from the mold after cooling.

The handle body 2 may be used for injection molding in which a glittering material such as a pearl pigment is kneaded and mixed with a resin for the purpose of improving the texture and design and creating a high-class feeling. In the resin containing this kind of glitter material, the glitter material is oriented when flowing in the mold, and therefore, the appearance in the head portion 10 of the fluid end is jetted in comparison with the case where the glitter material is not used. , Flow marks and weld lines become more noticeable.

In the handle body 2 of the present embodiment, since the through hole 46 is disposed at a position closest to the gate 50, the flow of the molten resin injected from the gate 50 by the axial mold forming the through hole 46 Can be controlled to control the speed and flow path size. Therefore, the jetting and the flow mark become inconspicuous in appearance. Furthermore, by arranging

grooves

47 and 49 extending from the through hole 46 to the fourth position P4 on the tip side, weld lines and

grooves

47 and 49 generated by merging after molten resin is branched by the through hole 46 The overlapping makes the appearance less noticeable.

Next, an operation when the handle portion 30 of the toothbrush 1 is gripped by a palm grip will be described.
(First position P1)
The front side of the first position P1 in the handle portion 30 is a finger rest portion on the neck portion 20 side, and the end of the thumb abuts. The middle section of the forefinger abuts on the back side of the first position P1. Thereby, the handle portion 30 is held so as to be sandwiched from the front side and the back side at the first position P1. At this time, since the groove 45A is disposed on the front side of the first position P1 and the groove 45B is disposed on the back side of the first position P1, the finger rest can be tactilely clarified. In addition, since the

grooves

45A and 45B are formed in a circular and annular shape, the

grooves

45A and 45B are less likely to slip even when the fingers move during movement in a plane substantially parallel to the flocked surface 11 including the width direction and the long axis direction.

In addition, since the cross section of the handle portion 30 at the first position P1 is flat, the handle portion 30 contacts the thumb on the front side and the forefinger on the back side at the first position P1 in a wide area, which makes it easy to apply force. Stable holding is possible. Therefore, operability can be improved by allowing the force applied to the handle portion 30 to be easily transmitted to the head portion 10 at the first position P1 close to the head portion 10, and the flocked surface can be properly applied to the teeth.

(Second position P2)
The second position P2 functions as an auxiliary portion on the neck portion 20 side to distinguish between the first position P1 and the third position P3 when gripping the handle portion 30. When the handle portion 30 is held by a palm grip, the last section of the thumb abuts on the front side of the second position P2, and the forefinger abuts on the circumferential direction of the second position P2, so that the front side at the first position P1 It is possible to hold the middle portion of the handle portion 30 held by gripping with the palm, middle finger and ring finger at the third position P3. Since the first constricted portion 43 is disposed at the second position P2 in a front view, the forefinger can be easily abutted in the circumferential direction. In addition, since the first constricted portion 43 is disposed, when grasping the handle portion 30, it is possible to tactilely recognize the difference in the shapes of the first position P1 and the third position P3, and it is easy to hold naturally It is also possible to be guided and fit.

(Third position P3)
At the third position P3, the largest second bulging portion 42 in the width direction is disposed, and functions as a gripping stabilizer. When the handle portion 30 is gripped by the palm grip, the palm, middle finger and ring finger abut in the circumferential direction of the third position P3. The handle portion 30 has a substantially circular cross-sectional shape at the third position P3, and the maximum width PW3 and the maximum thickness PT3 in the width direction are maximum as compared with the other positions P1, P2, and P4. It fits in the gripped hand and enables stable holding.

(4th position P4)
The region up to the rear end including the fourth position P4 functions as an assist portion when the handle portion 30 is gripped by the palm grip, particularly when the third position P3 is held by the palm, middle finger and ring finger. When the handle portion 30 is gripped by the palm grip, the ring finger, the little finger and the moon of the palm abut in the circumferential direction of the fourth position P4. Since the maximum width PW4 and the thickness PT4 at the fourth position P4 are both smaller than the maximum width PW3 and the thickness PT3 at the third position P3, the ring finger and the little finger shorter than the middle finger are also in the circumferential direction of the fourth position P4. It can be stably abutted.

In the above-described handle portion 30, the lengths in the width direction at the first position P1 to the fourth position P4 satisfy the above relationships (1) and (2), respectively, and thus the non-slip state at the first position P1 The palm, middle and ring fingers are held in the circumferential direction at the second bulging portion 42 of the third position P3 formed at the maximum diameter while being in contact with the thumb on the front side and the forefinger on the back side with a large area on the finger rest. The contact makes it possible to fit and hold stably in the gripped hand. In addition, since the minimum width PW2 of the first constricted portion 43 is smaller than the maximum width PW1 of the first bulging portion 41 and the maximum width PW3 of the second bulging portion 42, it is held at the first position P1 and the third position P3. The middle portion of the handle portion 30 can be additionally held, and the stable grip improves the operability at the time of cleaning. Furthermore, since the minimum width PW4 of the rear end including the second narrowing portion 44 is larger than the minimum width PW2 of the first narrowing portion 43, the holding in the second bulging portion 42 can be firmly assisted from the rear end side It is possible to contribute to the further stabilization of the gripping property. The said effect is acquired more by the above-mentioned PW3 / PW2 being 1.3 or more and 1.5 or less.

In the above-described handle portion 30, the thickness at the first position P1 to the fourth position P4 satisfies the above relationships (3) and (4), respectively, and the thickness of the first position P1 serving as the finger rest Since the thickness is set to be the thinnest, the first position P1 can be easily and strongly held from the front side and the back side. Therefore, the operability applied is improved by allowing the force applied to the handle portion 30 to be easily transmitted to the head portion 10 at a position close to the head portion 10, and the flocked surface can be properly applied to the teeth. In addition, since the thickness of the first position P1 is thin, a curved surface that protrudes sharply is formed between the

boundaries

31, 32 of the neck portion 20 and the handle portion 30 and the first position P1. Therefore, the grip of the gripped handle portion 30 in the long axis direction can be suppressed by the thumb and the forefinger which are in contact with the finger rest engaging with the curved surface on the rear end side. The said effect is acquired more by the above-mentioned PT3 / PT1 being 1.7 or more and 2.5 or less.

Further, in the handle portion 30 described above, the curved contour C1 of the first bulging portion 41, the curved contour C2 of the first narrowing portion 43, the curved contour C3 of the second bulging portion 42, and the curved contour C4 of the second narrowing portion 44 Is circumscribed to the adjacent curved contours in the long axis direction, and the curved contour C11, the curved contour C12, the curved contour C13, the curved contour C14 and the curved contour C15 on the front side circumscribes the adjacent curved contours in the long axis direction The curved contour C21, the curved contour C22, the curved contour C23, the curved contour C24, and the curved contour C25 on the back side circumscribe the adjacent curved contours in the major axis direction, whereby the respective contours are smoothly connected. Therefore, in the above-mentioned handle part 30, it is possible to cope with various ways of holding, and it is possible to realize the toothbrush 1 excellent in operability and versatility.

As described above, in the toothbrush 1 of the present embodiment, by appropriately setting the shape and size of the handle portion 30, a high grip property can be obtained with respect to the handle portion 30 without causing an increase in cost using the soft portion and the like. It is possible to obtain a toothbrush 1 having high operability at the time of cleaning. In particular, in the present embodiment, in the configuration having the head unit 10 with a wide wide head specification, when the brush unit abuts on the cleaning site, the grip of the gripped handle portion is large due to the large interference of the hair bundle. Even when it is difficult to reach the cleaning site, since the handle portion 30 which fits in the hand and has high gripping property is provided, the brush portion can be properly applied to the teeth with good operability.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The shapes, combinations, and the like of the constituent members shown in the above-described example are merely examples, and various changes can be made based on design requirements and the like without departing from the spirit of the present invention.

For example, although the configuration in which the

groove portions

45A and 45B are provided on both the front side and the back side of the first position P1 is illustrated in the above embodiment, the

groove portions

45A and 45B may be provided only on the front side or the back side.

Further, although the configuration using the head unit 10 of the wide head specification has been exemplified in the above embodiment, the invention is not limited to the wide head specification, and the present invention can be applied to a normal type or a compact specification head unit.

The present invention is applicable to a toothbrush.

DESCRIPTION OF SYMBOLS 1 ... Toothbrush, 2 ... Handle body, 10 ... Head part, 11 ... Flocked surface, 20 ... Neck part, 30 ... Handle part, 41 ... 1st bulging part, 42 ... 2nd bulging part, 43 ... 1st constriction Part 44: second constricted

part

45A, 45B: groove part P1: first position P2: second position P3: third position P4: fourth position

Claims

A head portion disposed on the tip side in the long axis direction and having a hair bundle implanted on the flocked surface,
A neck portion extended to the rear end side of the head portion;
A handle portion extended to the rear end side of the neck portion;
The handle portion is disposed continuously on both sides in the width direction orthogonal to the long axis direction and the front direction in a front view disposed on the rear end side of the neck portion and viewed from the front direction orthogonal to the flocked surface. A first bulging portion that changes into bulging and
A first constricted portion which is disposed closer to the rear end than the first bulging portion, and which continuously and symmetrically changes continuously on both sides in the width direction;
A second bulging portion which is disposed on the rear end side with respect to the first constricted portion and which squeezes by continuously changing symmetrically on both sides in the width direction;
And a second constricted portion which is disposed closer to the rear end than the second bulging portion, and which continuously and symmetrically changes and squeezes continuously on both sides in the width direction,
The first bulging portion has a maximum length in the width direction at a first position between the neck portion and the first narrow portion in the longitudinal direction.
The first narrowed portion has a minimum length in the width direction at a second position between the first bulging portion and the second bulging portion in the long axis direction,
The second bulging portion has a maximum length in the width direction at a third position between the first narrow portion and the second narrow portion in the long axis direction,
The second narrowed portion has a minimum length in the width direction at a fourth position on the rear end side with respect to the second bulging portion in the long axis direction,
Let the length in the width direction of the first constricted portion at the second position be PW2.
Assuming that the length in the width direction of the second bulging portion at the third position is PW3,
The PW3 is 15 mm or more and 20 mm or less,
PW3 / PW2 is 1.3 or more and 1.5 or less,
The thickness in the front direction at the first position is PT1.
Assuming that the thickness in the front direction at the third position is PT3,
The PT3 is 15 mm or more and 20 mm or less,
PT3 / PT1 is 1.7 or more and 2.5 or less,
Toothbrushes that are characterized by
The first bulging portion, the first constricting portion, the second bulging portion, and the second constricting portion respectively have a bulging portion or a constricting portion in which the outline of the front view is adjacent in the long axis direction The toothbrush according to claim 1, characterized in that it is formed by a circumscribed curve.
The cross-sectional shape of the handle portion at the first position is a flat shape whose length in the width direction is larger than the thickness in the front direction,
The cross-sectional shape of the said handle part in the said 3rd position is substantially circular, The toothbrush of Claim 1 or 2 characterized by the above-mentioned.
The toothbrush according to any one of claims 1 to 3, wherein at least one of the front side and the back side of the handle portion at the first position has a groove.
The toothbrush according to claim 4, wherein the groove is formed in an annular shape.
The toothbrush according to any one of claims 1 to 5, wherein the maximum length of the head portion in the width direction is 13 mm or more.