CN216932263U

CN216932263U - Tooth brush

Info

Publication number: CN216932263U
Application number: CN202123248337.9U
Authority: CN
Inventors: 木本雄也; 高井良辅; 石川晃大; 李佳薇
Original assignee: Lion Corp
Current assignee: Lion Corp
Priority date: 2020-12-24
Filing date: 2021-12-22
Publication date: 2022-07-12
Anticipated expiration: 2031-12-22
Also published as: CN116634904A; WO2022137971A1; JP2022100465A; TW202228550A; KR20230120631A

Abstract

The utility model provides a wide-head toothbrush capable of suppressing bending of a neck portion in a width direction and twisting of the neck portion in a circumferential direction around a longitudinal axis direction. The toothbrush has a maximum length of the head in the width direction of 12-18 mm, a maximum length of the head in the thickness direction of 2-4 mm, a minimum length of the neck in the width direction of 3-5 mm, and a minimum length of the neck in the thickness direction of 3-5 mm, wherein C is a region from the 2 nd position to the 3 rd position of 65% of the length of the neck, and D is a region from the 3 rd position to the 4 th position of the boundary of the neck and the grip part of 35% of the length of the neck, and the toothbrush satisfies a relationship of (volume of region D)/(volume of region C) ≥ 1.0, and the maximum length in the width direction is greater than the maximum length in the thickness direction at the 4 th position.

Description

Tooth brush

Technical Field

The present invention relates to toothbrushes.

This application claims priority based on Japanese patent application No. 2020-.

Background

The dimensions of the toothbrush head are of various types depending on the preference and purpose of the user. In terms of oral hygiene, a "compact head" that can brush teeth carefully is generally suitable, but for persons with insufficient brushing skills or persons who pay attention to brushing teeth efficiently in a short time, a "wide head" toothbrush having a wide head width that can brush the neck, the slit, and the surface of teeth simultaneously is provided (for example, patent document 1).

The problem with this "wide-head" toothbrush is that cleaning efficiency is high because a plurality of cleaning sites can be brushed at the same time, but the "cleaning accuracy" of each site, particularly the cleaning of crevices such as the crevices and necks of teeth, tends to deteriorate. This is because the tip of the brush hair tends to come into contact with a peripheral portion other than the portion to be brushed, and physical interference tends to occur.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open publication No. 2016-13247

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

When a thin neck portion is used in a "wide head" toothbrush in consideration of the operability in the oral cavity, the center of gravity becomes unstable during brushing, and therefore, problems such as bending of the neck portion in the width direction and twisting of the neck portion in the circumferential direction around the longitudinal axis direction occur.

The present invention has been made in view of the above points, and an object thereof is to provide a "wide-head" toothbrush capable of suppressing bending of a neck portion in a width direction, twisting of the neck portion in a circumferential direction around a longitudinal axis direction, and the like.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

According to the 1 st aspect of the present invention, there is provided a toothbrush comprising: a head portion located on a front end side in a longitudinal direction and having a hair-setting surface, a grip portion arranged on a rear end side of the head portion, and a neck portion arranged between the head portion and the grip portion; a maximum length of the head in a width direction parallel to the hair-planting surface and orthogonal to the long axis direction is 12mm to 18 mm; a maximum length of the head in a thickness direction orthogonal to the flocked surface is 2mm to 4 mm; a minimum length of the neck portion in the width direction and a minimum length of the neck portion in the thickness direction are 3mm to 5 mm; in the head, when a region from a front end in the longitudinal direction to a 1 st position on a rearmost end side where the length in the width direction is the largest is a, a region from the 1 st position to a 2 nd position on a boundary between the head and the neck is B, a region from the 2 nd position to a 3 rd position where the length in the longitudinal direction of the neck is 65% is C, and a region from the 3 rd position to a 4 th position on a boundary between the neck and the grip where the length in the longitudinal direction of the neck is 35% is D, the toothbrush satisfies a relationship of (volume of region D)/(volume of region C) ≧ 1.0; the maximum length in the width direction at the 4 th position is greater than the maximum length in the thickness direction.

Further, in the toothbrush according to one embodiment of the present invention, the toothbrush satisfies the relationship of (volume of the region A)/(volume of the region D) ≦ 0.60.

In the toothbrush according to one aspect of the present invention, the volume of the region D is 1000mm³The above.

Further, in the toothbrush according to one aspect of the present invention, the toothbrush satisfies the relationship of (the sum of the volume of the region A and the volume of the region C)/(the sum of the volume of the region A and the volume of the region B and the volume of the region C and the volume of the region D) of 0.70 or less.

In the toothbrush according to one aspect of the present invention, the maximum length in the width direction at the 4 th position is 11mm or more, and the toothbrush satisfies a relationship of (the maximum length in the width direction at the 4 th position) - (the maximum length in the thickness direction at the 4 th position) of not less than 2 mm.

Further, in the toothbrush according to one aspect of the present invention, the toothbrush satisfies a relationship of 1.5mm ≦ (maximum length in the width direction of the region a) - (maximum length in the width direction at the 4 th position) 7 mm.

In the toothbrush according to one aspect of the present invention, the toothbrush satisfies a relationship of (the maximum length in the thickness direction at the 4 th position) - (the maximum length in the thickness direction at the 3 rd position) of not less than 3 mm.

Further, in the toothbrush according to one aspect of the present invention, the toothbrush satisfies a relationship of (the maximum length in the thickness direction at the 3 rd position) - (the average value of the lengths of the regions a in the thickness direction in the long axis direction) of not more than 2 mm. The average value of the length of the region a in the thickness direction in the long axis direction is defined by a value represented by (the maximum value of the length of the region a in the thickness direction in the long axis direction + the minimum value of the length of the region a in the thickness direction in the long axis direction)/2.

In the toothbrush according to one aspect of the present invention, a maximum length of the region C in the thickness direction in the longitudinal direction is 4.5mm or less, and the toothbrush satisfies a relationship of (the maximum length in the width direction at the 3 rd position) - (the maximum length in the thickness direction at the 3 rd position) >1 mm.

[ Utility model effect ]

The utility model can provide a wide-head toothbrush capable of suppressing bending of a neck portion in a width direction, twisting of the neck portion in a circumferential direction around a long axis direction, and the like.

Drawings

Fig. 1 is a view showing an embodiment of the present invention, and is a front view of the toothbrush 1 viewed from the side of the flocked surface 3 a.

Fig. 2 is a side view showing the structure of the toothbrush 1.

Fig. 3 is a partially enlarged front view of the head 3 and a part of the neck 4.

Fig. 4 is a partially enlarged front view of the head 3 and a part of the neck 4.

[ reference numerals ]

1 … toothbrush, 3 … head, 3a … hair-planting surface, 4 … neck, 5 … holding part, 6 … hair-planting hole

Detailed Description

Hereinafter, an embodiment of the toothbrush according to the present invention will be described with reference to fig. 1 to 4.

The following embodiment is an embodiment of the present invention, and is not intended to limit the present invention, and may be arbitrarily modified within the scope of the technical idea of the present invention. In the drawings below, for the sake of easy understanding of the respective structures, the actual structures are different from the structures in scale, number, and the like.

In the following description, the side of the head 3 on which the flocked surface 3a is provided (the side facing the flocked surface) is referred to as the front side of the toothbrush 1, and the side opposite to the side facing the flocked surface 3a of the head 3 is referred to as the back side of the toothbrush 1. The direction in which the handle 2 extends is defined as the longitudinal direction, the direction parallel to the implanted surface 3a and orthogonal to the longitudinal direction is defined as the width direction of the toothbrush 1, and the direction orthogonal to the implanted surface 3a is defined as the thickness direction of the toothbrush 1. Note that the side where the head 3 is provided in the longitudinal direction (the head 3 side) is referred to as the front end side, and the side where the grip 5 is provided (the grip 5 side) is referred to as the rear end side.

Fig. 1 is a front view of the toothbrush 1 viewed from the bristle surface 3a side.

Fig. 2 is a side view showing the structure of the toothbrush 1. In fig. 1, brush unit 40 is not shown.

As shown in fig. 1 and 2, a toothbrush 1 of the present embodiment includes: a handle body 2 formed of a resin molded body formed into a long shape as a whole, and a brush portion 40. The overall length of the toothbrush 1 is, for example, 150mm to 200 mm.

The shank 2 is formed of a hard resin. The shank 2 has: a head portion 3 having a flocked surface 3a on the front end side, a grip portion 5 disposed on the rear end side of the head portion 3, and a neck portion 4 disposed between the head portion 3 and the grip portion 5. The toothbrush 1 can clean the oral cavity by the brush part 40 having a plurality of tufts (not shown) provided on the bristle-implanted surface 3a of the head 3.

Examples of the hard resin forming the stem 2 include resins having a flexural modulus of elasticity (JIS7171) of 1000MPa to 2800MPa, and polypropylene (PP), Polyacetal (POM), polybutylene terephthalate (PBT) and the like are preferably used in view of strength.

(outline shape of both sides of the handle body in the width direction)

As shown in fig. 1, in the toothbrush 1 of the present embodiment, when the handle 2 is viewed from the front, the outline of the handle 2 on both sides in the width direction is formed to be line-symmetrical with respect to a center line located at the center in the width direction and extending in the longitudinal direction. Therefore, in the following description, the outline of one side (lower side in fig. 1) in the width direction will be described, and the outline of the other side (upper side in fig. 1) will not be described. In addition, regarding the position of the center of curvature of the curved region extending in an arc shape, a case of being located on the center side in the width direction with respect to the outline of the outer shape is referred to as an inner side, and a case of being located on the opposite side to the center in the width direction is referred to as an outer side.

The toothbrush 1 of the present embodiment has, when the handle 2 is viewed from the front, on the outline of the handle 2 in the width direction: a 1 st curved line region E1 in which the length of the head 3 in the width direction extends in an arc shape from the front end to the rear end side of the head 3; a 1 st straight line region L1 extending from the rear end of the 1 st curved region E1 to the 1 st position P1 with a constant length in the width direction of the head 3 toward the rear end side; a 2 nd linear region L2 in which the length of the head 3 in the width direction is reduced from the 1 st position P1 to a 2 nd position P2 which is a boundary between the head 3 and the neck 4; a 3 rd straight line region L3 extending from the 2 nd position P2 toward the rear end side with the length of the neck 4 in the width direction being constant; a 2 nd curved region E2 having a center of curvature on an outer side and extending in an arc shape from a rear end of the 3 rd curved region L3 toward a rear end side; a 3 rd curved region E3 having a curvature center on the inner side and extending in an arc shape from the rear end of the 2 nd curved region E2 toward the rear end side; a 4 th linear region L4 extending from the rear end of the 3 rd curved region E3 toward the rear end side with the width-directional length of the grip 5 being constant.

(outline shape of the front surface of the handle body)

As shown in fig. 2, the toothbrush 1 of the present embodiment has, when the handle 2 is viewed from the side, on the outline of the front surface of the handle 2: a 5 th linear region L5 extending linearly from the rear end side of the head 3 toward the grip portion 5 side and continuing from the flocked surface 3a of the head 3 toward the rear end side; a 4 th curved region E4 having a curvature center on the front side, extending in an arc shape toward the rear end side from the rear end of the 5 th linear region L5 to a 4 th position P4 having a convex apex 51 and serving as a boundary between the neck portion 4 and the grip portion 5; a 5 th curvature region E5 having a curvature center on the front side and extending in an arc shape from the apex 51 of the 4 th position P4 toward the rear end side; and a 6 th straight line region L6 linearly extending from the rear end of the 5 th curved line region E5 to the rear end side.

(outline shape of the back side of the handle body)

The toothbrush 1 of the present embodiment has, on the outline of the handle 2 on the back side when the handle 2 is viewed from the side, the following: a 7 th linear region L7 extending linearly from the front end of the head 3 to the rear end side; a 6 th curved line region E6 having a curvature center on the front side and extending in an arc shape from the rear end of the 7 th straight line region L7 toward the rear end side; and an 8 th straight line region L8 linearly extending from the rear end of the 6 th curved line region E6 to the rear end side.

The outline shape of the toothbrush 1 is not limited to the above description, and may be, for example, a configuration in which the 2 nd and 3 rd linear regions L2 and L3 are curved lines or a configuration in which a curved line and a straight line are combined.

(head)

The head 3 is a portion brushed across the oral cavity by a plurality of hair bundles, and as shown in fig. 1, has the following shape in a front view: a substantially rectangular shape having a circular arc shape is assumed, while the corners are rounded. In the present embodiment, the boundary between the head 3 and the neck 4 is: in the shape in the front view of the head 3, the end point of the curve forming the corner cut on the neck 4 side, that is, the 2 nd position P2 where the bending direction of the curve forming the corner cut is changed.

The head 3 has a flocked surface 3a on the front side. A plurality of implanted holes 6 are arranged in a row on the implanted surface 3 a. The shape and the diameter of the implanted hole 6 are not particularly limited, and fig. 1 shows, as an example, the implanted hole 6 having a circular shape and the same diameter in a front view. The implantation holes 6 are arranged in rows in which a plurality of implantation holes 6 (3 to 7 in fig. 2) are arranged at intervals in the width direction corresponding to the length of the head 3 in the width direction, and a plurality of rows (10 in fig. 2) are arranged at intervals in the longitudinal direction. In the bristle-implanting holes 6, tufts constituting the brush portion 40 are implanted, respectively.

A plurality of bristles (monofilaments) are gathered into a bundle and folded into two, and a fixing member (not shown) made of metal called a flat plate is interposed therebetween and driven into the implantation holes 6, thereby implanting the bundle into each of the implantation holes 6. The shape of the head 3 is not particularly limited, and for example, the surface on the front surface side of the head 3 on which the bristles are implanted and the surface on the back surface side of the head 3 are flat and parallel to each other.

The maximum length of the head 3 in the width direction is preferably 12mm to 18mm, for example. The head 3 of the present embodiment is a so-called wide head type. By having the head 3 of a wide head type, a contact area with each part of the teeth can be earned, and a plurality of teeth can be brushed, so that tooth brushing can be performed efficiently.

The maximum length of the head 3 in the thickness direction is, for example, preferably 2mm to 4mm, and more preferably 2.5mm to 3.5 mm. The head 3 of the present embodiment is a so-called thin head. By providing the thin head 3, the operability for the molar teeth can be improved and the cleaning power for the molar teeth can be improved even with the wide head 3.

In the present embodiment, in the head 3, a region from the leading end in the longitudinal direction to the 1 st position P1 on the rearmost end side where the length in the width direction is largest is defined as a, and a region from the 1 st position P1 to the 2 nd position P2 on the boundary between the head 3 and the neck 4 is defined as B.

In addition, when the outline of the head 3 in the front view is an ellipse or the like and the position on the rearmost end side where the length in the width direction is the largest is not located on the rearmost end side from the center of the head 3 in the major axis direction, the position on the major axis direction of the rear end side edge portion of the hair-planting holes 6 in the rearmost end side row among the rows where the number of the hair-planting holes 6 arranged in the width direction is the largest may be the 1 st position P1.

In the head 3, the ratio of the total volume of the implanted holes 6 (total hole volume) to the resin volume of the implanted region connecting the outer edge of the implanted hole 6 located on the outermost periphery side is preferably 1: more than 2.5.

By making the ratio of the total volume of the hair-planting holes 6 to the resin volume of the hair-planting region 1: 2.5 or more, the amount of resin in the implanted region becomes large relative to the implanted pores 6, and the head 3 becomes rigid, so that even if the head is wide and thin, the head 3 can be prevented from warping and flexing during use.

The maximum length of the head 3 in the longitudinal direction is preferably 25mm or more. By setting the maximum length of the head 3 in the longitudinal direction to 25mm or more, the thin region becomes long, and brushing is easy to reach the deep of molars. Further, the length of the neck portion 4 can be suppressed from becoming excessively long, and brushing can be performed without excessive deflection of the neck portion 4.

(neck)

The neck portion 4 is a portion disposed between the grip portion 5 and the head portion 3 and connecting the grip portion 5 and the head portion 3. The boundary between the neck 4 and the grip 5 is a 4 th position P4 at which a 4 th curved region E4 intersects a 5 th curved region E5 in a side view. That is, the convex apex 51 is formed at a position where the 4 th curved region E4 and the 5 th curved region E5 having the curvature center on the outer side are connected.

When there is no convex apex or when it is not visually recognizable, the boundary between the neck portion 4 and the grip portion 5 is a position where the center of curvature is switched in the thickness direction in the side view, and when this position cannot be specified, for example, when the position is switched from a hard resin to a different resin such as a soft resin such as an elastomer, and when this position cannot be specified, the position is 75mm away from the front end of the head portion 3 toward the rear end side.

In the neck 4, starting from the 2 nd position P2 of the boundary with the head 3 toward the grip 5, the outline thereof is constant at the region formed by the 3 rd straight line region L3 and has the minimum width in the front view shown in fig. 1. In the neck 4, the width is gradually widened from the minimum width in the region from the rear end of the 3 rd straight line region L3 to the 4 th position P4. The 4 th position P4 is the rear end of the 3 rd curved region E3 whose outline is connected through the 2 nd curved region E2.

The minimum length of the neck portion 4 in the width direction is preferably 3mm or more and 5mm or less, and more preferably 3.5mm or more and 4.5mm or less. The minimum length of the neck portion 4 in the thickness direction is preferably 3mm to 5 mm. The neck portion 4 of the present embodiment is a so-called thin neck type (slim neck type). By setting the minimum length of the neck portion 4 in the width direction and the minimum length in the thickness direction to 3mm or more and 5mm or less, the operability for the molar teeth can be improved and the cleaning power for the molar teeth can be improved even in the wide head type head portion 3.

The length from the 1 st position P1 on the rearmost end side where the length in the width direction of the head 3 is largest to the 2 nd position P2 on the foremost end side where the length in the width direction of the neck 4 is smallest is preferably 9.0mm or less.

By setting the length from the 1 st position P1 to the 2 nd position P2 to 9.0mm or less, the width of the rear end side of the head 3 is thereby sharply converged, the length until the neck 4 becomes the thinnest part can be reduced, and operability can be improved.

(grip portion)

The grip portion 5 is a portion to be gripped by a user and is formed in a long columnar shape.

In the side view shown in fig. 1, the length of the grip portion 5 in the width direction is constant from the 4 th position P4 of the boundary of the grip portion 5 and the neck portion 4 toward the rear end side.

In the grip 5, from the 4 th position P4 of the boundary between the grip 5 and the neck 4 toward the rear end side in the side view shown in fig. 2, the 5 th curved region E5 in the outline on the front surface side becomes maximum at the 4 th position P4, and the thickness gradually decreases from the rear end side end of the 5 th curved region E5 where the grip 5 has the minimum thickness. The grip portion 5 has a constant length in the thickness direction toward the rear end side with respect to the rear end side end portion of the 5 th curved region E5.

The grip portion 5 has, as an example, a finger contact portion 50 that contacts the thumb on the front side. The finger contact portion 50 is formed at the rear end side end portion of the 5 th curved region E5 in the side view, and the 5 th curved region E5 has a concave curved surface toward the rear side as it goes from the apex 51 toward the rear end side. By providing the curved surface of the concave shape in the finger contact portion 50, the bonding (fit) property can be obtained when the finger contact portion 50 is pressed to the back surface side.

By the finger contact portion 50 having the convex apex 51 and the flat shape, it can be adjusted so as not to be excessively deflected in the thickness direction, and propagation of the deflection from the neck portion 4 to the grip portion 5 can be suppressed.

Further, by providing the convex apex 51, it is possible to secure a large thickness on the front surface side of the grip portion 5, prevent excessive deflection in the thickness direction, and transmit appropriate flexibility to the grip portion 5 side, thereby suppressing propagation of deflection from the neck portion 4 to the grip portion 5.

The length in the longitudinal direction from the distal end of the head 3 to the distal end side end (the 4 th position P4) of the finger contact section 50 is preferably 77mm to 90 mm.

By setting the length in the longitudinal direction from the distal end of the head portion 3 to the distal end of the finger contact portion 50 to 77mm or more and 90mm or less, the distal end of the finger contact portion 50 is sufficiently longer than the distal end thereof, and the finger contact portion can easily reach the deep side of a molar tooth.

The length in the longitudinal direction from the narrowest portion (position 2P 2) of the neck portion 4 to the distal end of the finger contact portion 50 (position 4P 4) is preferably 52mm to 70 mm.

By setting the length in the longitudinal direction from the thinnest portion of the neck portion 4 to the tip end portion of the finger contact portion 50 to 52mm or more and 70mm or less, the neck portion 4 becomes sufficiently long and easily reaches the deep side of the molar teeth.

Preferably, the distance in the thickness direction between the back surface of the head 3 and the back surface of the grip portion 5 or the distance in the thickness direction between the front surface (the flocked surface 3 a) of the head 3 and the front surface of the grip portion 5 is 2.5mm or less on either the back surface side or the front surface side in the thickness direction from the neck portion 4 to the rear end of the grip portion 5, and the cross-sectional shape orthogonal to the long axis direction is a flat shape having a wide width, and the thickness from the neck portion 4 to the finger contact portion 50 is gradually increased on either the back surface side or the front surface side in the thickness direction.

Thereby, the thickness from the neck portion 4 to the finger contact portion 50 is increased in one direction, and therefore, even the neck portion 4 of a long type is less likely to be flexed, and a sufficient brushing feeling can be obtained. Further, since the difference in the position in the thickness direction between the neck portion 4 and the grip portion 5 is small, the oral cavity can be easily brushed at a target position. Further, the position of the rear end side end of the 3 rd linear region L3 is preferably within ± 15mm in the longitudinal direction from the 3 rd position P3 described later.

In the case of such a configuration, it is preferable that the thickness sharply increases by, for example, 5 to 10mm in a region from the position on the rearmost end side where the length of the neck portion 4 in the width direction is smallest to the end portion on the distal end side of the finger contact portion 50. Further, it is preferable that the back surface of the head 3 is parallel to the back surface of the grip portion 5, or the front surface of the head 3 is parallel to the front surface of the grip portion 5. Thus, the force transmitted from the grip 5 to the head 3 is applied to the teeth with the same vector, and a sufficient brushing feeling can be obtained, and the operability can be improved.

The grip portion 5 preferably has a length in the thickness direction of 9.0mm or more and a length in the width direction of 10mm or more, and has a region in which the thickness and the width are constant of 80mm or more and is formed only of a hard resin, and more preferably has a region in which the thickness and the width are constant of 90mm or more and 120mm or less.

If the area where the thickness and width of the grip portion 5 are constant is less than 80mm, the grip portion cannot be gripped with the entire palm and is unstable. When the area where the thickness and width of the grip portion 5 are constant exceeds 120mm, the grip portion is not fixed, and the center of gravity is unstable when the grip portion is gripped on the rear end side. By making the thickness and width of the grip portion 5 within the above ranges and by forming only of a hard resin, it is not easily flexed, and it is possible to firmly grip and obtain a sufficient brushing feeling.

Preferably, the length of the grip portion 5 in the longitudinal direction from the front end of the finger contact portion 50 to the rear end of the grip portion 5 is 80mm to 120mm, and the total length of the grip body 2 is 150mm to 200mm, as described above.

By setting the length of the grip portion 5 and the handle 2 within the above range, a strong grip can be obtained and a sufficient brushing feeling can be obtained, and by securing a sufficient total length, ease of grip and ease of reaching in the oral cavity can be ensured.

(region A to region D)

As shown in fig. 1, in the neck 4, when a region from the 2 nd position P2 to the 3 rd position P3 having a length of 65% with respect to the longitudinal direction of the neck 4 is C, and a region from the 3 rd position P3 to the 4 th position P4 having a length of 35% with respect to the longitudinal direction of the neck 4 and being the boundary between the neck 4 and the grip 5 is D, the relationship of (the volume of the region D)/(the volume of the region C) ≧ 1.0 is preferably satisfied, and the relationship of (the volume of the region D)/(the volume of the region C) ≧ 1.5 is more preferably satisfied.

By setting the volume of the region D located on the rear end side of the neck portion 4 to be equal to or larger than 1.0, that is, by setting the volume of the region D located on the front end side of the neck portion 4 to be equal to or larger than the volume of the region C located on the front end side of the neck portion 4, the base on the grip portion 5 side of the neck portion 4 can be reinforced while the advantage of the operability in the oral cavity on the front end side of the neck portion 4 is ensured, and the flexure and the twist can be suppressed.

The volumes of the regions a to D are calculated by the area of each of the regions a to D in the front view angle × the area in the side view angle/the length in the long axis direction.

The length in the width direction at the 3 rd position P3, which is the rear end side end of the region C, is preferably 6.7mm or less.

By setting the length in the width direction at the 3 rd position P3 to 6.7mm or less, the thin region continues in the neck portion 4 from the 2 nd position P2 of the boundary between the neck portion 4 and the head portion 3 to the 3 rd position P3, and operability can be ensured.

A value represented by (the maximum length of the region C in the width direction)/(the maximum length of the region C in the thickness direction) is preferably 1.0 to 1.8 in the entire longitudinal direction of the region C.

By setting the value represented by (the maximum length of the region C in the width direction)/(the maximum length of the region C in the thickness direction) in the entire longitudinal direction of the region C to 1.0 or more and 1.8 or less, the width of the neck portion 4 in the wide-head toothbrush 1 can be increased and the twisting becomes difficult.

The position where the length in the width direction is increased by 1mm with respect to the 2 nd position P2 which is the starting point of the region C is preferably: the starting point of the region C is located closer to the finger contact portion 50 than the position of 40% of the length of the neck portion 4 in the longitudinal direction, and more preferably located closer to the finger contact portion 50 than the position of 50% of the length of the neck portion 4 in the longitudinal direction.

By making the position where the length in the width direction is increased by 1mm be located closer to the finger contact portion 50 side than the position where the length in the long axis direction of the neck portion 4 is 40%, the length in the width direction is small and the thin region is long, so that the operability can be improved.

Preferably, at the 4 th position P4 which is the rear end side end portion of the region D, the widthwise maximum length is larger than the thicknesswise maximum length.

By having the maximum length in the width direction larger than the maximum length in the thickness direction at the 4 th position P4, a shape flattened in the width direction can be formed.

The volume of the region D is preferably 1000mm³Above, more preferably 1300mm³The above.

By making the volume of the region D1000 mm³As described above, the volume of the root of the neck 4 is sufficiently large, and the flexure and the twist can be suppressed.

Preferably, the maximum length in the width direction at the 4 th position P4, which is the rear end side end portion of the region D, is 11mm or more, and satisfies the relationship (maximum length in the width direction at the 4 th position P4) - (maximum length in the thickness direction at the 4 th position P4) ≧ 2 mm.

By setting the maximum length in the width direction at the 4 th position P4, which is the rear end side end portion of the region D, to 11mm or more while satisfying the relationship (maximum length in the width direction at the 4 th position P4) - (maximum length in the thickness direction at the 4 th position P4) ≥ 2mm, the base of the neck portion 4 becomes wide, and therefore bending and twisting of the neck portion 4 in the width direction can be suppressed.

Further, it is preferable that the relationship of 1.5 mm. ltoreq (the maximum length in the width direction of the region A) - (the maximum length in the width direction at the 4 th position P4) is 7mm or less.

If the (maximum length in the width direction of the region a) - (maximum length in the width direction at the 4 th position P4) is less than 1.5mm, it is not suitable for the wide-head 3 or the neck 4, and the base of the head is abnormally wide, which impairs the feeling of use. When (the maximum length in the width direction of the region a) - (the maximum length in the width direction at the 4 th position P4) exceeds 7mm, the distortion suppression effect is reduced.

Further, it is preferable that the relationship of (the maximum length in the thickness direction at the 4 th position P4) - (the maximum length in the thickness direction at the 3 rd position P3) ≥ 3mm be satisfied.

By satisfying the relationship of (the maximum length in the thickness direction at the 4 th position P4) - (the maximum length in the thickness direction at the 3 rd position P3) ≥ 3mm, the difference in thickness in the region D of the neck 4 can be increased. Therefore, the propagation of the flexure in the thickness direction to the grip portion 5 can be suppressed. Therefore, in the short region D, the thickness of the neck portion 4 is sharply increased, whereby twisting can be suppressed while securing the advantage of operability.

For the region A in the head 3 and the region D of the neck 4, the relationship of (the volume of the region A)/(the volume of the region D) ≦ 0.60 is preferably satisfied, and the relationship of (the volume of the region A)/(the volume of the region D) ≦ 0.40 is more preferably satisfied. With respect to the volume of region a, it excludes the volume of the implant hole 6 (full hole volume).

By setting (volume of the region a)/(volume of the region D) to 0.60 or less, the volume of the head 3 can be made smaller with respect to the volume of the rear end side of the neck 4. Therefore, by setting (the volume of the region a)/(the volume of the region D) to 0.60 or less, not only can the advantages of efficient brushing and operability by the thin wide head be ensured, but also the rear end side of the neck portion 4 can be reinforced and the deflection and twist can be suppressed.

The relationship of 0.7 ≦ (volume of region A)/[ (volume of region B) + (volume of region C) ] ≦ 1.0 is preferably satisfied for regions A and B in the head 3, and region C of the neck 4. With respect to the volume of region B, it excludes the volume of implanted pores 6 (full pore volume).

By satisfying the relationship of 0.7 ≦ (volume of region a)/[ (volume of region B) + (volume of region C) ] ≦ 1.0, the volume of region a becomes smaller relative to the sum of the volume of region B and the volume of region C, and thus operability can be ensured.

It is preferable to satisfy the relationship of (the maximum length in the thickness direction at the 3 rd position P3) - (the average of the lengths of the region A in the thickness direction in the long axis direction) ≦ 2 mm. The average value of the length of the region a in the thickness direction in the long axis direction is defined by a value represented by (the maximum value of the length of the region a in the thickness direction in the long axis direction + the minimum value of the length of the region a in the thickness direction in the long axis direction)/2.

By satisfying the relationship of (the maximum length in the thickness direction at the 3 rd position P3) - (the average of the lengths of the region a in the thickness direction in the long axis direction) ≦ 2mm, whereby the thickness from the head portion 3 to 65% of the front end side (head portion 3 side) of the neck portion 4 is not largely changed, so that the operability can be improved.

Preferably, the maximum length of the region C in the thickness direction in the long axis direction is 4.5mm or less, and satisfies the relationship of (the maximum length in the width direction at the 3 rd position P3) - (the maximum length in the thickness direction at the 3 rd position P3) >1 mm.

By setting the maximum length of the region C in the long axis direction to 4.5mm or less and satisfying the relationship of (the maximum length in the width direction at the 3 rd position P3) - (the maximum length in the thickness direction at the 3 rd position P3) >1mm, it is possible to secure the operational advantage at the portion up to the base of the neck portion 4 while the neck portion 4 is wide, and it is possible to suppress the flexure and twist of the neck portion 4 in the width direction.

Preferably, the relationship of (the sum of the volume of the region A and the volume of the region C)/(the sum of the volume of the region A and the volume of the region B and the volume of the region C and the volume of the region D) is ≦ 0.70, more preferably, the relationship of 0.20 ≦ (the sum of the volume of the region A and the volume of the region C)/(the sum of the volume of the region A and the volume of the region B and the volume of the region C and the volume of the region D) is ≦ 0.50.

By satisfying the relationship of (the sum of the volume of the region A and the volume of the region C)/(the sum of the volume of the region A and the volume of the region B and the volume of the region C and the volume of the region D) ≦ 0.70, the proportion of the distortion-inducing region with respect to the entire shank body 2 can be reduced, and it can be made less likely to be distorted.

Fig. 3 is a partially enlarged front view of a part of the head 3 and the neck 4.

As shown in fig. 3, in the front view, the smaller angle α of the angle at which the line segment S1 intersects the line segment S2 is preferably 40 ° or more and 60 ° or less, the line segment S1 connects the point P11 located on the side edge of the head 3 on the rearmost side where the length in the width direction of the head 3 is the largest and the point P12 located on the foremost side where the length in the width direction of the neck 4 is the smallest, and the line segment S2 connects the points located on the side edges of the head 3 on the rearmost side where the length in the width direction of the head 3 is the largest.

By setting the angle α at which the line segment S1 intersects the line segment S2 to 40 ° or more and 60 ° or less, the width of the rear end side of the head 3 is sharply narrowed, and the length of the neck 4 to the thinnest part can be reduced, thereby improving the operability.

As shown in fig. 3, in the front view, the smaller angle β of the angle at which the line segment S3 intersects the line segment S2 is preferably 75 ° to 85 °, the line segment S3 connects the point P11 on the side edge of the head 3 on the rearmost side where the length in the width direction of the head 3 is the largest to the point P13 on the rearmost side where the length in the width direction of the neck 4 is the smallest, and the line segment S2 connects the points on both side edges of the head 3 on the rearmost side where the length in the width direction of the head 3 is the largest.

By setting the angle β at which the line segment S3 intersects with the line segment S2 to 75 ° or more and 85 ° or less, the length of the neck 4 up to the thinnest portion can be ensured, and operability can be improved.

Fig. 4 is a partially enlarged front view of a part of the head 3 and the neck 4.

As shown in fig. 4, in the front view, the smaller angle γ is preferably 70 ° to 80 ° in the angle at which the line segment S4 intersects the line segment S5, the line segment S4 connects the point P14 located on the side edge of the head 3 on the forefront side where the length in the width direction of the head 3 is the largest and the point P12 located on the forefront side where the length in the width direction of the neck 4 is the smallest, and the line segment S5 connects the points located on both side edges of the head 3 on the forefront side where the length in the width direction of the head 3 is the largest.

By setting the angle γ at which the line segment S4 intersects the line segment S5 to 70 ° or more and 80 ° or less, the head 3 having a long thin region is formed, and thus brushing the depth of a molar tooth is facilitated.

As shown in fig. 4, in the front view, the smaller angle Δ is preferably 80 ° to 85 ° among the angles at which the line segment S6 intersects the line segment S5, the line segment S6 connects the point P14 located on one side edge of the head 3 on the foremost end side where the length in the width direction of the head 3 is the largest and the point P13 located on the rearmost end side where the length in the width direction of the neck 4 is the smallest, and the line segment S5 connects the points located on both side edges of the head 3 on the foremost end side where the length in the width direction of the head 3 is the largest.

By setting the angle Δ at which the line segment S6 intersects the line segment S5 to 80 ° or more and 85 ° or less, the head 3 having a long thin region is formed, and thus brushing the depth of a molar tooth is facilitated. Further, the length of the neck portion 4 can be suppressed from becoming excessively long, and brushing can be performed without excessive deflection of the neck portion 4.

As described above, in the toothbrush 1 of the present embodiment, a wide-head toothbrush capable of suppressing the neck portion 4 from being bent in the width direction or from being twisted in the circumferential direction around the longitudinal direction can be provided.

[ examples ]

Hereinafter, the effects of the present invention will be further clarified by examples. The present invention is not limited to the following examples, and can be carried out with appropriate modifications within a scope not changing the gist thereof.

Examples 1 to 9 and comparative examples 1 to 2

In the present example, toothbrush samples of examples 1 to 9 and comparative examples 1 to 2 were produced according to the specifications shown in [ Table 1] below.

The dimensions of the respective parts of the toothbrushes of the respective examples are shown in table 1. Polypropylene (PP) resin is used as the hard resin of the shank.

The samples of examples 1 to 9 and comparative examples 1 to 2 each had a maximum length of 15.0mm in the width direction of the head, a constant length of 3.0mm in the thickness direction of the head, a maximum length of 4.0mm in the width direction of the neck, and a maximum length of 4.0mm in the thickness direction of the neck.

[ evaluation method ]

The oral cavity was cleaned by a 10-person professional panel using each of the toothbrush samples, and the "ease of flexing in the width direction" and the "feeling of being sufficiently swiped without distortion" at that time were evaluated according to the following evaluation criteria. The following evaluations were made on the basis of the average scores of a 10-person professional panel. The average score of 10 persons in the professional group was "excellent (Very Good (Good))" at 5.5 points or more, the average score was "Good (Good))" at 4.0 points or more and less than 5.5 points, the average score was "Δ (general (Not Bad))" at 3.0 points or more and less than 4.0 points, and the average score was "poor (Bad))" at less than 3.0 points.

(1) Degree of difficulty of deflection in width direction

[ evaluation standards ]

7, dividing: it is very difficult to flex.

6 min: it is not easily bent.

And 5, dividing: slightly less flexible.

And 4, dividing: neither is.

And 3, dividing: slightly flexible but acceptable.

And 2, dividing: it is quite flexible.

1 minute: it is very flexible.

(2) Can brush and sweep fully without distortion

7, dividing: can be sufficiently brushed completely without twisting.

6 min: can be sufficiently brushed with almost no twist.

And 5, dividing: can be sufficiently brushed without being twisted too much.

And 4, dividing: none of them.

And 3, dividing: slight twisting does not brush adequately, but is acceptable.

And 2, dividing: it is twisted and cannot be brushed sufficiently.

1 minute: is very distorted and cannot be brushed sufficiently.

[ TABLE 1]

As shown in Table 1, the maximum length of the head in the width direction was 12mm to 18mm, the maximum length of the head in the thickness direction was 2mm to 4mm, the minimum length of the neck in the width direction and the minimum length of the neck in the thickness direction were 3mm to 5mm, and the relationship of (the volume of the region D)/(the volume of the region C) ≥ 1.0 was satisfied, and the maximum length in the width direction at the 4 th position, which is the position of the rear end side end of the region D, was greater than the maximum length in the thickness direction in the toothbrush samples of examples 1 to 9 in which the "ease of flexing in the width direction" and the "feeling of being able to sufficiently brush without twisting" were both evaluated well.

In addition, in the toothbrush samples of examples 3 to 4 and 9 satisfying the relationship of (volume of region A)/(volume of region D) of 0.60 or less, good evaluations were obtained in both "ease of flexing in the width direction" and "feeling of being able to sufficiently brush without distortion".

In addition, the volume in the region D is 1000mm³The toothbrush samples of examples 5 to 6 and 9 above were evaluated well in terms of both "the degree of flexibility in the width direction" and "the feeling of being able to brush sufficiently without distortion".

In addition, in the toothbrush samples of examples 2 to 7, 9 satisfying the relationship of (sum of volume of region A and volume of region C)/(sum of volume of region A and volume of region B and volume of region C and volume of region D) ≦ 0.70, good evaluation was obtained in both "ease of flexing in the width direction" and "feeling of being sufficiently swishable without distortion".

Further, in the toothbrush samples of examples 8 to 9 in which the maximum length in the width direction at the 4 th position was 11mm or more and the relationship of (the maximum length in the width direction at the 4 th position) - (the maximum length in the thickness direction at the 4 th position) ≥ 2mm was satisfied, good evaluations were obtained in both "the ease of flexing in the width direction" and "the feeling of being able to brush sufficiently without distortion".

According to the above results, the toothbrush sample of example 9 was evaluated particularly well in both "the degree of difficulty in flexing in the width direction" and "the feeling of being sufficiently swiped without twisting", and further, the toothbrush samples of examples 2, 6 were evaluated more favorably.

On the other hand, in comparative example 1 in which the relationship of (volume of region D)/(volume of region C) ≧ 1.0 is not satisfied, and comparative example 2 in which the maximum length in the width direction at the 4 th position which is the position of the rear end side end of region D is smaller than the maximum length in the thickness direction, good evaluations were not obtained in both "ease of flexing in the width direction" and "feeling of being sufficiently swishable without distortion".

Although preferred embodiments of the present invention have been described above with reference to the drawings, it is needless to say that the present invention is not limited to the embodiments. The shapes, combinations, and the like of the respective components shown in the above examples are examples, and various modifications can be made in accordance with design requirements and the like without departing from the scope of the present invention.

[ Industrial Applicability ]

The utility model is applicable to toothbrushes.

Claims

1. A toothbrush, comprising:

a head part located at the front end side of the long axis direction and provided with a hair-planting surface,

a grip portion disposed on a rear end side of the head portion, an

A neck portion disposed between the head portion and the grip portion,

the maximum length of the head in the width direction parallel to the hair-planting surface and orthogonal to the longitudinal direction is 12mm to 18mm,

the maximum length of the head in the thickness direction orthogonal to the hair-planted surface is 2mm to 4mm,

a minimum length of the neck portion in the width direction and a minimum length of the neck portion in the thickness direction are 3mm to 5mm,

in the head, a region from a leading end in the longitudinal direction to a 1 st position on a rearmost end side where the length in the width direction is largest is defined as A, and a region from the 1 st position to a 2 nd position on a boundary between the head and the neck is defined as B,

in the neck part, when a region from the 2 nd position to the 3 rd position where the length in the longitudinal direction of the neck part is 65% is C, and a region from the 3 rd position to the 4 th position of the boundary between the neck part and the grip part where the length in the longitudinal direction of the neck part is 35% is D, the toothbrush satisfies: (volume of region D)/(volume of region C) ≥ 1.0,

the maximum length in the width direction is greater than the maximum length in the thickness direction at the 4 th position.

2. The toothbrush of claim 1, wherein the toothbrush satisfies: (the volume of the region A)/(the volume of the region D) is less than or equal to 0.60.

3. Toothbrush according to claim 1 or 2, characterised in that the volume of the zone D is 1000mm³The above.

4. The toothbrush according to claim 1 or 2, wherein the toothbrush satisfies: (the sum of the volume of the zone A and the volume of the zone C)/(the sum of the volume of the zone A and the volume of the zone B and the volume of the zone C and the volume of the zone D) is less than or equal to 0.70.

5. The toothbrush according to claim 1 or 2, wherein the maximum length in the width direction at the 4 th position is 11mm or more, and,

the toothbrush satisfies the following conditions: (the maximum length in the width direction at the 4 th position) - (the maximum length in the thickness direction at the 4 th position) ≥ 2 mm.

6. The toothbrush according to claim 1 or 2, wherein the toothbrush satisfies: 1.5mm ≦ (the maximum length in the width direction of the area a) - (the maximum length in the width direction at the 4 th position) in a relationship of 7 mm.

7. The toothbrush according to claim 1 or 2, wherein the toothbrush satisfies: (the maximum length in the thickness direction at the 4 th position) - (the maximum length in the thickness direction at the 3 rd position) ≥ 3 mm.

8. The toothbrush according to claim 1 or 2, wherein the toothbrush satisfies: (the maximum length in the thickness direction at the 3 rd position) - (the average of the lengths of the region A in the thickness direction in the long axis direction) is 2mm or less.

9. The toothbrush according to claim 1 or 2, wherein a maximum length of the region C in the thickness direction in the long axis direction is 4.5mm or less,

the toothbrush satisfies the following conditions: (the maximum length in the width direction at the 3 rd position) - (the maximum length in the thickness direction at the 3 rd position) >1 mm.