WO2021131553A1 - 歯ブラシ - Google Patents

歯ブラシ Download PDF

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Publication number
WO2021131553A1
WO2021131553A1 PCT/JP2020/044832 JP2020044832W WO2021131553A1 WO 2021131553 A1 WO2021131553 A1 WO 2021131553A1 JP 2020044832 W JP2020044832 W JP 2020044832W WO 2021131553 A1 WO2021131553 A1 WO 2021131553A1
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WO
WIPO (PCT)
Prior art keywords
rear end
end side
toothbrush
handle portion
inflection point
Prior art date
Application number
PCT/JP2020/044832
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
静香 川崎
良祐 蜂須賀
Original Assignee
ライオン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ライオン株式会社 filed Critical ライオン株式会社
Priority to JP2021567123A priority Critical patent/JPWO2021131553A1/ja
Publication of WO2021131553A1 publication Critical patent/WO2021131553A1/ja

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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware

Definitions

  • the present invention relates to a toothbrush.
  • the present application claims priority based on Japanese Patent Application No. 2019-237178 filed in Japan on December 26, 2019, the contents of which are incorporated herein by reference.
  • Patent Document 1 a toothbrush having a neck portion in which the center of an arc is located on the flocked surface side and a curved surface of an arc contour having a concave flocked surface side in a side view is formed on both the flocked surface side and the back surface side.
  • the toothbrush disclosed in Patent Document 1 has the curved surface, so that the toothbrush can be inserted into the last molars and has improved operability.
  • the toothbrush disclosed in Patent Document 1 is an S-shaped toothbrush in which the shape of the neck portion on the back surface side is once curved to the back surface side near the boundary between the head portion and the neck portion and then to the flocked surface side.
  • the back side of the neck portion When inserted into the back of the back teeth in the oral cavity, the back side of the neck portion may come into contact with the cheeks to reduce the usability, and a toothbrush with a more excellent usability has been demanded. Further, if the neck portion extending from the head portion is thick, it becomes necessary to open the lips wide when inserting into the oral cavity, and the operability is deteriorated.
  • the present invention has been made in consideration of the above points, and an object of the present invention is to provide a toothbrush having excellent insertability and operability.
  • a brush provided with a handle portion along a long axis direction, a neck portion extended from the tip of the handle portion, and a head portion located at the tip of the neck portion.
  • a toothbrush having a main body and having hair bundles planted in a plurality of flocked holes formed on the flocked surface of the head portion, wherein the brush main body is a neck portion of the neck portion from the head portion toward the handle portion. It has a shape in which the thickness continuously increases, and the maximum thickness of the head portion is 2.0 mm or more and less than 4 mm.
  • a first straight line region that continuously extends linearly to the rear end side, and a circle from the first turning point that has a center of curvature on the flocked surface side and is located at the rear end of the first straight line region to the rear end side.
  • An arc-shaped first curved region extending in an arc shape and a second curved point located at the rear end of the first curved region having a center of curvature on the back side opposite to the flocked surface side to the rear end side. It has a second curved region extending to, and among the plurality of flocked holes, it is located at the rearmost side edge of the flocked hole and the second rearmost side in the side view.
  • the inclination angle of the neck portion represented by the angle at which the two intersects is 8 ° or more and 25 ° or less.
  • a second straight line region continuously extending linearly from the back surface of the head portion to the rear end side and the flocked surface side. It is characterized by having a third curved region having a center of curvature and extending in an arc shape from a third inflection point located at the rear end of the second straight line region to the rear end side.
  • the toothbrush on the back side in the side view, from the fourth inflection point located at the rear end of the third curve region having the center of curvature on the back side. It is characterized by having a fourth curved region extending in an arc shape on the end side.
  • the minimum thickness of the neck portion is 3.0 to 4.0 mm, and the length in the major axis direction is 5 mm or more.
  • the cross-sectional shape at the boundary between the neck portion and the handle portion is elliptical.
  • the length of the neck portion in the major axis direction is 25 mm or more and 45 mm or less.
  • the position in the long axis direction where the distance between the handle portion on the flocked surface side and the virtual line is the longest in the side view is the long axis of the handle portion. It is characterized in that it is located on the tip side of the center of the direction.
  • the tip end side of the head portion is inclined at an angle of 5 ° or more and 15 ° or less with respect to the flocked surface side with respect to the virtual line in the side view. It is characterized by that.
  • the present invention makes it possible to provide a toothbrush having excellent insertability and operability.
  • FIGS. 1 to 4 show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.
  • the side of the head portion 5 provided with the flocked surface 5a is the front side of the toothbrush 1
  • the side of the head portion 5 opposite to the side facing the flocked surface 5a is the back side of the toothbrush 1.
  • the direction parallel to the fluffed surface 5a and orthogonal to the length direction of the brush body 2 will be described as the width direction of the toothbrush 1
  • the direction orthogonal to the fluffed surface 5a will be described as the thickness direction of the toothbrush 1.
  • the side on which the head portion 5 is provided will be referred to as the front end side
  • the side on which the handle portion 3 is provided will be referred to as the rear end side.
  • FIG. 1 is a side view showing the configuration of the toothbrush 1.
  • FIG. 2 is a front view of the toothbrush 1 as viewed from the flocked surface 5a side.
  • FIG. 3 is an enlarged front view of the head portion 5.
  • FIG. 4 is an enlarged side view of the head portion 5. In FIGS. 2 to 4, the brush 40 is not shown.
  • the toothbrush 1 of the present embodiment includes a brush body 2 and a brush 40 made of a resin molded body formed in an elongated shape as a whole.
  • the brush body 2 is provided with a handle portion 3 along the long axis direction, a neck portion 4 extended from the tip of the handle portion 3, and a head portion 5 provided at the tip of the neck portion 4.
  • the major axis direction is the direction in which the virtual line 50, which will be described later, extends.
  • the resin constituting the brush body 2 for example, polypropylene (PP) resin, polyacetylene (POM) resin, polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, or the like is preferably used.
  • PP resin polypropylene (PP) resin, polyacetylene (POM) resin, polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, or the like is preferably used.
  • PP resin polypropylene (PP) resin, polyacetylene (POM) resin, polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, or the like is preferably used.
  • PBT polybutylene terephthalate
  • PET polyethylene terephthalate
  • the flexural modulus (JIS K 7171) of the resin constituting the brush body 2 is preferably 1000 to 2800 MPa, more preferably 1200 to 2500 MPa, and even more preferably 1500 to 2000 MPa.
  • the toothbrush 1 of the present embodiment has a handle from the rear end side of the head portion 5 (“the rear end side of the head portion 5” will be described later) on the front side of the brush main body 2 when the brush main body 2 is viewed from the side.
  • a first straight line region S1 that continuously extends linearly toward the rear end side from the flocked surface 5a of the head portion 5 toward the portion 3 side, and a rear end of the first straight line region S1 that has a center of curvature on the front side.
  • first inflection point E1 extending in an arc shape from the first inflection point P1 located to the rear end side, and from the second inflection point P2 having a center of curvature on the back surface side and located at the rear end of the first curve area E1. It has a second curved region E2 extending in an arc shape on the rear end side.
  • the first inflection point P1 is located at the head portion 5.
  • the second inflection point P2 forms a boundary between the neck portion 4 and the handle portion 3. That is, the handle portion 3 is located at the rear end side of the second inflection point P2. The details of the second inflection point P2 at the boundary between the neck portion 4 and the handle portion 3 will be described later.
  • the toothbrush 1 of the present embodiment is continuous from the back surface of the head portion 5 from the rear end side of the head portion 5 toward the handle portion 3 side on the back surface side of the brush body 2 when the brush body 2 is viewed from the side.
  • a second substantially straight line region S2 extending linearly to the rear end side and an arc shape to the rear end side from the third inflection point P3 having a center of curvature on the front side and located at the rear end of the second straight line region S2.
  • a third curve region E3 extending to the rear end side and a fourth curve region E4 extending in an arc shape from the fourth inflection point P4 having a center of curvature on the back surface side and located at the rear end of the third curve region E3.
  • the third inflection point P3 is located at the head portion 5.
  • the fourth curve area E4 is a portion that a finger touches when the handle portion 3 is gripped.
  • the fourth curved area E4 has an arc shape having a center of curvature on the back side, and is curved in a concave shape on the back side. Improves.
  • the radius of curvature R1 is preferably 60 mm or more and 150 mm or less.
  • the radius of curvature R2 is preferably 50 mm or more and 100 mm or less.
  • the radius of curvature R3 is preferably 80 mm or more and 400 mm or less.
  • the radius of curvature R4 is preferably 70 mm or more and 200 mm or less.
  • the radius of curvature R1 is preferably 50 to 250 mm, more preferably 60 to 200 mm, and even more preferably 60 to 150 mm.
  • the radius of curvature R2 is preferably 50 to 250 mm, more preferably 60 to 200 mm, and even more preferably 50 to 100 mm.
  • the radius of curvature R3 is preferably 50 to 600 mm, more preferably 60 to 500 mm, and even more preferably 80 to 400 mm.
  • the radius of curvature R4 is preferably 50 to 400 mm, more preferably 60 to 300 mm, and even more preferably 70 to 200 mm.
  • the cross-sectional shape at the boundary (P2) between the neck portion 4 and the handle portion 3 is preferably a substantially quadrangular shape, a substantially polygonal shape, a perfect circle, or an elliptical shape, and more preferably an elliptical shape.
  • the above shape reduces the ease of holding and reduces the operability when brushing the back teeth.
  • Boundary definitive cross-sectional area of the neck portion 4 and the handle portion 3 is preferably 20 ⁇ 80 mm 2, more preferably 25 ⁇ 55 mm 2, even more preferably 25 ⁇ 45 mm 2 or less. Within the above range, durability can be ensured.
  • the head portion 5 is a portion for wiping the inside of the oral cavity with a plurality of hair bundles 41, has a substantially rectangular parallelepiped shape, and has a rounded corner portion.
  • the head portion 5 has a flat plate portion 51 located on the rear end side and having a flocked surface 5a serving as a reference surface on the front end side, and an inclined plate located on the front end side of the flat plate portion 51. It has a part 52.
  • the flocked surface 5a and the back surface on the opposite side form a flat surface with each other.
  • the flat plate portion 51 is substantially parallel to the virtual line 50 described later in the side view.
  • the inclined plate portion 52 is provided, but the inclined plate portion 52 may not be provided and only the flat plate portion 51 may be formed.
  • the inclined plate portion 52 is inclined in the direction toward the front side (that is, the flocked surface side) toward the tip side.
  • the angle at which the inclined plate portion 52 is inclined with respect to the flat plate portion 51 is preferably an angle of 5 ° or more and 15 ° or less. In the present embodiment of FIGS. 1 and 4, the angle at which the inclined plate portion 52 is inclined with respect to the flat plate portion 51 is, for example, 10 °.
  • the inclined plate portion 52 Since the inclined plate portion 52 is inclined with respect to the flat plate portion 51, the hair length of the hair bundle 41 at the tip of the head portion 5 is shortened, and the hair bundle is bent as compared with the hair bundle 40 at the rear end of the head portion 5. By making it harder, the hair becomes more elastic, which gives a feeling of high cleaning of the back teeth. Since the inclination angle of the inclined plate portion 52 is in the range of 5 ° to 15 °, the feeling of cleaning the back teeth is excellent.
  • the inclined plate portion 52 has three flocked surfaces 5b to 5d having different heights. Each flocked surface 5b to 5d is parallel to the flocked surface 5a. The flocked surfaces 5b to 5d are gradually increased toward the tip side according to the inclination of the inclined plate portion 52. Further, as shown in FIG. 1, the hair length of the hair bundle 41 planted on the flocked surface 5b to 5d is the same height as the hair length of the hair bundle 40 planted on the flocked surface 5a. The hair length of the hair bundle 41 planted on the flocked surfaces 5b to 5d may be lower or higher than the hair length of the hair bundle 40 planted on the flocked surface 5a.
  • a plurality of flocked holes 6 having the same diameter are arranged side by side in a staggered pattern on the flocked surfaces 5a to 5d.
  • the hair follicles 6 are provided at positions where they are arranged in rows adjacent to each other in the long axis direction with a half pitch shift.
  • Each hair follicle 6 is formed by bundling a plurality of brushes (filaments), folding them in half, sandwiching a metal retaining tool (not shown) called a flat line between them, and driving the hair follicles into the hair follicles 6. It is planted in.
  • the hair follicles 6 are not limited to the configuration in which a plurality of the hair follicles are arranged side by side in a grid pattern, and the hair follicles holes 6 may be arranged in a staggered pattern. Further, since the inner diameter of the hair transplant hole 6 correlates with the number of hair bundles to be transplanted, it affects the hardness and usability of the hair bundles, but the usability depends on the thickness and length of the hair bundles used for flocking. Although it can be adjusted to some extent, the range of 1.0 to 3.0 mm is generally preferable.
  • the flocking holes 6 provided on the flocking surface 5a are formed in the normal direction of the flocking surface 5a.
  • the flocked holes 6 provided on the flocked surfaces 5b to 5d are formed so as to be inclined by 5 °, for example, in the direction in which the openings face the rear end side with respect to the normal direction of the flocked surfaces 5b to 5d, respectively. There is.
  • the flocking surfaces 5a to 5d are arranged orthogonally to the flocking direction, so that the hair can be stably transplanted. it can.
  • the flocking hole 6 is greatly inclined with respect to the driving direction (for example, when it is inclined in the direction orthogonal to the inclined plate portion 52)
  • the driving of the hair follicle 41 may become unstable.
  • the flocking holes 6 provided on the flocking surfaces 5b to 5d are only inclined by 5 ° in the direction toward the rear end side, the hair bundle 41 can be driven without any trouble.
  • the hair bundle 41 is not particularly limited in terms of the material of the brush, but for example, polyamide (eg 6-12 nylon, 6-10 nylon), polyester (eg polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate), polyolefin. (Example: polypropylene), elastomer (eg, olefin-based, styrene-based) and other synthetic resin materials can be mentioned. Further, a plurality of these resin materials may be used in combination, and different resin materials may be used for the core portion and the sheath portion, for example, a core sheath structure or the like.
  • polyamide eg 6-12 nylon, 6-10 nylon
  • polyester eg polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate
  • polyolefin e.g., polypropylene
  • elastomer eg, olefin-based, styrene
  • the brush constituting the hair bundle 41 for example, the diameter of the hair gradually decreases toward the tip of the hair, and the tip of the hair is sharpened (tapered hair), and the diameter thereof is from the flocked surface 5a toward the tip of the hair.
  • Examples thereof include flocking hair (straight hair) in which the hairs are almost the same.
  • Examples of straight hair include those in which the tips of the hair are flat and substantially parallel to the flocked surface 5a, and those in which the tips of the hair are hemispherically rounded.
  • the brushes constituting the hair bundles 41 planted on the flocked surfaces 5b to 5d are preferably tapered hairs or straight hairs.
  • the brush forming the hair bundle 40 planted on the flocked surface 5a is preferably tapered hair or straight hair. The tip of any of the flocked surfaces 5a to 5d may be cut off.
  • the cross-sectional shape of the brush is usually circular, but is not limited to such a shape, for example, elliptical, triangular, quadrangular, hexagonal, star-shaped, three-leaf cloverleaf, four-leaf. It can be any shape such as a clover shape.
  • the hair length of the hair bundle 41 is preferably 8 mm to 13 mm for adults and 6 mm to 9 mm for children from the flocked surface 5a of the head portion 5.
  • the thickness (maximum diameter) of the brush is preferably 0.12 mm to 0.26 mm from the viewpoint of usability and usability in the oral cavity. Further, a plurality of brushes having different thicknesses may be used in any combination in consideration of usability, brushing feeling, cleaning effect, durability and the like.
  • the lower end of the hair bunch is set at the head portion 5.
  • a heat fusion method in which the hair is press-fitted into the molten resin to be fixed, or a molten mass is formed by heating the lower end of the hair bundle, and then the molten resin is filled in the cavity of the mold and integrated with the head portion 5.
  • An in-mold method for molding or the like can be used.
  • the head portion 5 has a substantially quadrangular flat plate shape in which four tops are cut into curved corners when viewed from the front.
  • the boundary O between the head portion 5 and the neck portion 4 is the end point of the curve forming the corner cut from the neck portion 4 in the front view shape of the head portion 5, that is, the curve forming the corner cut. This is the position where the bending direction changes. Therefore, the boundary O between the head portion 5 and the neck portion 4 is a curve whose width is widened from a curve or a straight line forming both edges in which the width of the corner cut portion of the head portion 5 in the head portion 5 is narrower than that of the neck portion 4 in a plan view. It is a position that changes to.
  • the head portion 5 may have a shape and size that makes it easy to wipe the inside of the oral cavity, and the shape is not particularly limited. For example, the width gradually narrows from the proximal end side to the distal end side. The shape may be. Further, the head portion 5 may have a tapered shape in which the thickness gradually decreases from the base end side to the tip end side, or may have a rounded shape in which the central portion on the back surface side of the head portion 5 is raised. Good.
  • the thickness of the head portion 5 is preferably 2 mm or more and less than 4 mm, and more preferably 2.5 to 3.5 mm. If the thickness of the head portion 5 is not constant, the thickness of the head portion 5 is defined as the maximum thickness of the head portion 5. If the thickness of the head portion 5 is less than 2 mm, the durability may decrease. When the thickness of the head portion 5 is 4 mm or more, the insertability into the back teeth and the operability may be deteriorated. By setting the thickness of the head portion 5 to 2 mm or more and less than 4 mm, it is possible to improve the insertability into the back teeth and the operability without lowering the durability.
  • the neck portion 4 is a portion that connects the handle portion 3 and the head portion 5.
  • the outer shape of the neck portion 4 and the handle portion 3 in the front view and the side view is a shape in which a plurality of gentle curves are connected from the boundary O of the head portion 5 and the neck portion 4 toward the handle portion 3 side. Is.
  • the position where the bending direction of the gentle curve is reversed is defined as the boundary between the neck portion 4 and the handle portion 3. That is, in the side view of FIG. 1, the curve of the neck portion 4 on the front side faces from the boundary O toward the handle portion 3, and the center of curvature of the first straight line region S1 having the center of curvature on the front side changes to the back side.
  • the starting position (second inflection point P2) is defined as the boundary between the neck portion 4 and the handle portion 3.
  • the length of the neck portion 4 in the major axis direction is defined as the shortest distance between the position of the inflection point P2 and the boundary O in the side view.
  • the length of the neck portion 4 is preferably 25 to 45 mm, more preferably 25 to 40 mm.
  • the cross-sectional shape of the neck portion 4 is preferably a substantially quadrangular shape, a substantially polygonal shape, a perfect circle, or an elliptical shape, and more preferably an elliptical shape. It is more preferable that the ellipse has a major axis in the thickness direction.
  • the thickness of the neck portion 4 continuously increases from the front end side to the rear end side. By continuously increasing the thickness of the neck portion 4, the strength of the neck portion 4 can be increased as compared with the case where the thickness of the neck portion 4 is constant. Further, since the thickness of the neck portion 4 continuously increases from the distal end side to the posterior end side, the opening of the lips does not increase when inserted into the oral cavity, and operability in the oral cavity is ensured. Can be done.
  • the minimum thickness of the neck portion is preferably 3.0 to 4.0 mm, more preferably 3.0 to 3.6 mm.
  • the minimum width of the neck portion is preferably 3.0 to 4.5 mm, more preferably 3.5 to 4.2 mm.
  • the minimum diameter of the neck portion 4 is preferably 3.0 to 4.0 mm, more preferably 3.0 to 3.6 mm. If the minimum thickness of the neck portion, the minimum width of the neck portion, and the minimum diameter of the neck portion 4 are less than 3.0 mm, the neck portion 4 tends to bend, which may reduce operability. If the minimum thickness of the neck portion, the minimum width of the neck portion and the minimum diameter of the neck portion 4 exceed 4.0 mm, the operability in the oral cavity may be deteriorated.
  • the length of the neck portion having a minimum thickness of 3.0 to 4.0 mm is preferably 5 mm or more, more preferably 6 mm or more, still more preferably 7 mm or more.
  • the length of the neck portion having a minimum width of 3.0 to 4.5 mm is preferably 5 mm or more, more preferably 6 mm or more, still more preferably 7 mm or more.
  • the length of the neck portion having a minimum diameter of 3.0 to 4.0 mm is preferably 5 mm or more, more preferably 6 mm or more, still more preferably 7 mm or more.
  • the first curved region E1 forming the front side of the neck portion 4 in the side view and the third curved region E3 forming the back side of the neck portion 4 in the side view are both centered on the front side. Since it has an arc shape, it follows the curve of the dentition and can improve the insertability when brushing the buccal side of the back teeth.
  • the inclination angle ⁇ of the neck portion 4 is a straight line passing through the rear end side edge portion of the hair follicle hole 6 located on the rearmost end side in the side view and the second inflection point P2, and the virtual line 50 shown in FIG. It is represented by the angle of intersection.
  • the virtual line 50 passes through the rear end side edge portion Q1 of the hair follicle hole 6 located on the rearmost end side and the rear end side edge portion Q2 of the hair follicle hole 6 located on the second rear end side in the side view. It is a straight line.
  • Q1 and Q2 are parallel to the flocked surface on the rear end side of the head portion in a general toothbrush.
  • the inclination angle of the neck portion 4 is preferably 8 ° or more and 25 ° or less.
  • the inclination angle of the neck portion 4 is less than 8 °, it is necessary to open the lips wide sideways when brushing the buccal side of the back teeth, which may reduce insertability and operability.
  • the inclination angle of the neck portion 4 exceeds 25 °, it is necessary to bend the wrist significantly when changing the polishing portion, which may reduce the operability when brushing the back teeth.
  • the shortest distance between the second inflection point P2 and the virtual line 50 in the side view is preferably 5 mm or more and 15 mm or less, and more preferably 8 mm or more and 12 mm or less.
  • the shortest distance between the "rear side P2'" facing the second inflection point P2 in the side view and the virtual line 50 is preferably 1 mm or more and 3 mm or less, and 1.5 mm or more and 3 mm or less. More preferably.
  • the S-shape can be secured, and the intraoral insertability and usability can be improved.
  • the toothbrush disclosed in Patent Document 1 is an S-shaped toothbrush in which the shape of the neck portion on the back surface side warps once on the back surface side near the boundary between the head portion and the neck portion and then on the flocked surface side. Therefore, when it is inserted into the oral cavity, the back side of the neck portion may come into contact with the cheek and the usability may be deteriorated.
  • the shapes of the head portion and the neck portion on the back surface side in the side view are curved from the third inflection point to the front side and have a curvature center on the front side. It forms the curve region E3 of 3.
  • the head portion 5 is reduced to 2 to 4 mm
  • the thickness, width and diameter of the neck portion are reduced to 3.0 to 4.5 mm
  • the length in the major axis direction is 5 mm or more.
  • the first straight line region S1 the first curve region E1 having the center of curvature on the front side
  • the second curve having the center of curvature on the back side.
  • the handle portion 3 is a portion to be gripped by the user and is formed in a long columnar shape. In order to secure a sufficient length for gripping and using the handle portion 3, it is preferable that the length from the boundary O in the front view to the rear end of the handle portion 3 is 100 to 200 mm.
  • the handle portion 3 has a thickness (second curve region E2 and fourth) from the front end side (second inflection point P2 side) to the rear end side when the brush body 2 is viewed from the side. It has a shape in which the thickness (distance from the curved region E4) continuously increases, reaches the maximum thickness, and then decreases toward the rear end side.
  • the portion located closest to the neck portion 4 side shall be uniquely defined as the portion having the maximum thickness of the handle portion 3.
  • the portion having the maximum thickness of the handle portion 3 is the handle portion 3Amax.
  • the handle portion 3 has a position P11 in the long axis direction in which the distance between the front surface in the side view and the virtual line 50 is the longest (that is, the position P11 is the maximum height with respect to the virtual line 50 in the side view). Is located at the handle portion 3A on the tip side of the handle portion 3 in the long axis direction. That is, the position P11 is located at a position closer to the tip of the head portion than the central position of the length of the handle portion 3 in the major axis direction.
  • the front end side of the head portion is the handle portion 3A
  • the rear end side of the handle portion is the handle portion 3B with the position P11 as a boundary.
  • the position of the front surface in the side view is close to the position of the tip of the hair bundle 41 for fine control of the hair tips.
  • the position P11 has a longer distance from the virtual line 50 than the tip of the hair bundle 41.
  • the second inflection point P2 which is the tip of the handle portion 3 (handle portion 3A)
  • the rear end of the handle portion 3 has a longer distance from the virtual line 50 than the tip of the hair bundle 41.
  • the region between the position P11 and the second inflection point P2 has a large change with respect to the position of the tip of the hair bundle 41, whereas the position P11 and the rear end The region between them has a small change with respect to the position of the tip of the hair bundle 41 and is suitable for fine control of the hair tip. Therefore, since the position P11 is located on the handle portion 3A, the area suitable for fine control of the hair tips becomes long, and the back teeth can be easily brushed even when the rear end side of the handle portion 3 is gripped.
  • the shortest distance between the position P11 on the front surface of the handle portion 3 and the virtual line 50 in the side view is preferably 20 mm or more and 32 mm or less, and more preferably 22 mm or more and 26 mm or less.
  • the distance between the position P11 and the virtual line 50 is less than 20 mm, or when the distance between the position P11 and the virtual line 50 exceeds 32 mm, the position of the front side surface in the side view at the rear end of the handle portion 3. May be far away from the tip of the hair bundle 41 and the controllability of the hair tip may be reduced.
  • the distance is preferably 8 mm or more and 12 mm or less, and more preferably 10 mm or more and 12 mm or less.
  • the back surface side of the handle portion 3 has a shape that does not intersect with the virtual line 50 up to the end portion of the handle portion.
  • the shortest distance between the back surface of the handle portion 3B on the terminal end side of the handle portion and the virtual line 50 is preferably 8 mm or more and 20 mm or less, and preferably 10 mm or more and 15 mm or less.
  • the shortest distance between the endmost portion of the handle portion and the virtual line 50 in the side view is preferably 8 mm or more and 20 mm or less, and preferably 12 mm or more and 18 mm or less.
  • the shortest distance of the line segment connecting the boundary O and the position P11 is preferably 70 to 110 mm, more preferably 80 to 110 mm, further preferably 80 to 100 mm, and particularly preferably 90 to 100 mm. Further, the shortest distance of the line segment connecting the inflection point P2 and the position P11 in the side view is preferably 40 to 80 mm, more preferably 50 to 70 mm.
  • the cross-sectional shape of the handle portion 3 is preferably a substantially quadrangular shape, a substantially polygonal shape, a perfect circle, or an elliptical shape, and more preferably an elliptical shape. Further, it is more preferable that the elliptical shape has a major axis in the width direction.
  • the thickness of the handle portion 3 is maximum in the handle portion 3A.
  • the maximum thickness of the handle portion 3A is preferably 9 mm or more and 14 mm or less, and more preferably 10.5 mm or more and 12.5 mm or less.
  • the width of the handle portion 3 is maximum in the handle portion 3A.
  • the maximum width of the handle portion 3A is preferably 11 mm or more and 16 mm or less, and more preferably 12.5 mm or more and 14.5 mm or less.
  • the handle portion 3A has a maximum thickness and a maximum width. As a result, the S-shape is secured to improve the intraoral insertion property and the usability, the gripability of the handle portion 3 is improved, and excellent operability by the palm grip or the like can be obtained.
  • the shortest distance between the position where the maximum thickness of the handle portion 3 is obtained in the side view (handle portion 3Max) and the virtual line 50 is preferably 20 mm or more and 32 mm or less, and more preferably 22 mm or more and 26 mm or less. ..
  • the handle portion 3Amax' which extends in the direction perpendicular to the virtual line 50 and is the intersection of the handle portion 3Amax and the surface on the back surface facing the handle portion 3Amax'.
  • the shortest distance from the virtual line 50 is preferably 8 mm or more and 12 mm or less, and more preferably 10 mm or more and 12 mm or less.
  • the ratio of the maximum thickness of the handle portion 3 to the maximum width of the handle portion 3 is preferably 0.6 or more and 1.3 or less, and is 0. More preferably, it is 0.7 or more and 1.0 or less.
  • the ratio of the maximum thickness of the handle portion 3 to the maximum thickness of the head portion 5 is preferably 2.3 or more and 7.0 or less. More preferably, it is 2.8 or more and 4.2 or less.
  • the ratio of the maximum thickness of the handle portion 3 to the minimum thickness of the neck portion 4 is preferably 2.0 or more and 5.6 or less. More preferably, it is 2.6 or more and 4.8 or less.
  • the cross-sectional area of the handle portion 3 is maximum at the handle portion 3A.
  • the cross-sectional area of the handle portion 3 is preferably 70 mm 2 or more and 200 mm 2 or less, and more preferably 90 mm 2 or more and 150 mm 2 or less.
  • the first inflection point P1 is located at the head portion 5, and the second inflection point P2 is provided on the rear end side.
  • the distance is preferably 28 mm or more and 40 mm or less, and more preferably 30 mm or more and 35 mm or less.
  • the first inflection point P1 is located at the head portion 5, and the second inflection point P2 is provided on the rear end side.
  • the distance between the first inflection point P1 and the second inflection point P2 is preferably 28 mm or more and 45 mm or less, more preferably 28 mm or more and 41 mm or less. It is more preferably 30 mm or more and 40 mm or less.
  • the toothbrush 1 of the present embodiment has a thin head portion 5, a thin neck portion 4, and a thick handle portion 3, when a load is applied to the head portion 5 during tooth brushing, first, the first substantially straight line region S1 on the front side is formed. The stress is concentrated on the first inflection point P1 through the passage. The first inflection point P1 is located at a position facing the second substantially straight line region S2 on the back side. Therefore, in the second substantially straight line region S2, a drag force (repulsive force) acts in the front direction in order to disperse the stress received in the back direction at the first inflection point P1.
  • a drag force reactive force
  • the front side of the brush main body 2 when stress concentration in the back direction acts at the first inflection point P1, the front side due to the nature of the curved shape. Has the property that drag is easy to work.
  • the larger the radius of curvature of the first curved region E1 the more easily the drag force is dispersed and transmitted.
  • a third curved region E3 having a center of curvature on the front side is provided on the back side of the brush body 2, when stress in the back direction is transmitted to the third inflection point P3, due to the nature of the curved shape. , In the third curved region E3, the drag force tends to act on the front side. In addition, the larger the radius of curvature of the third curved region E3, the easier it is for the drag to be dispersed and transmitted.
  • the second inflection point P2 is located at a position facing the third curved region E3. Further, since the first curved region E1 and the third curved region E3 have a center of curvature on the front side of the brush body 2, the drag direction at the second inflection point P2 is the front side.
  • a second curved region E2 having a center of curvature is provided on the back side of the brush body 2 on the front side, when a drag force in the front direction acts at the second inflection point P2, due to the nature of the curved shape. , There is a property that drag is easy to work on the back side.
  • the larger the radius of curvature of the second curved region E2 the easier it is for the drag to be dispersed and transmitted.
  • the drag force in the front direction acts at the second inflection point P2
  • the drag force in the back direction due to the second curved region E2 becomes easier to work and is transmitted in the direction of the handle portion 3.
  • Stress distribution is possible.
  • the effect in the front direction from the third curved region E3 is also transmitted, so that it can be expected that the acting drags cancel each other out on the front side and the back side, and the stress can be further dispersed.
  • stress concentration on the neck portion 4 is avoided due to the characteristic shapes of the front side and the back side in the side view of the brush body 2, and the brush body 2 from the head portion 5 to the handle portion 3 is avoided. It is possible to disperse the stress as a whole and suppress the bending of the neck portion 4.
  • the handle portion 3 is provided with a covering material 8 on a part of the outer peripheral surface thereof.
  • the covering material 8 is made of a soft resin.
  • the covering material 8 is provided in a spiral shape counterclockwise toward the rear end side.
  • the covering material 8 may be configured to cover the entire outer peripheral surface of the handle portion 3.
  • an elastomer resin such as a polyolefin-based elastomer, a styrene-based elastomer, a polyester-based elastomer, a polyurethane-based thermoplastic elastomer, or a silicone resin can be used.
  • the toothbrush 1 improves the grip when gripping the handle portion 3 and improves the operability when brushing the back teeth.
  • the toothbrush 1 of the present embodiment can provide a toothbrush having excellent insertability, operability and durability even when brushing molars.
  • toothbrushes of Examples 1 to 4 and Comparative Examples 1 to 3 were prepared according to the specifications shown in Table 1 below.
  • Table 1 A toothbrush similar to that shown in FIGS. 1 and 1 was produced.
  • the total length of the handle body of the toothbrush of each example was 180 mm, and each part had the dimensions shown in Table 1.
  • Twenty-three hairs (manufactured by PBT: 7.5 mil) were bundled into a hair bundle on the head portion, and the hair bundle was planted in the flocking pattern shown in FIG. 2 to provide a flocking portion.
  • the present invention can be applied to a toothbrush.

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PCT/JP2020/044832 2019-12-26 2020-12-02 歯ブラシ WO2021131553A1 (ja)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04505563A (ja) * 1989-02-20 1992-10-01 ソーラー　ワイド　インダストリアル　リミテッド 歯科用補助器具
JPH09182625A (ja) * 1995-12-28 1997-07-15 Lion Corp 歯刷子
JPH11103935A (ja) * 1997-10-03 1999-04-20 Kao Corp 歯ブラシ
JPH11511998A (ja) * 1995-08-22 1999-10-19 コルゲート・パーモリブ・カンパニー 歯ブラシ
KR20160003092U (ko) * 2016-08-24 2016-09-13 (주) 민성정밀 절곡된 각도를 갖는 칫솔
WO2018079114A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04505563A (ja) * 1989-02-20 1992-10-01 ソーラー　ワイド　インダストリアル　リミテッド 歯科用補助器具
JPH11511998A (ja) * 1995-08-22 1999-10-19 コルゲート・パーモリブ・カンパニー 歯ブラシ
JPH09182625A (ja) * 1995-12-28 1997-07-15 Lion Corp 歯刷子
JPH11103935A (ja) * 1997-10-03 1999-04-20 Kao Corp 歯ブラシ
KR20160003092U (ko) * 2016-08-24 2016-09-13 (주) 민성정밀 절곡된 각도를 갖는 칫솔
WO2018079114A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ

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JPWO2021131553A1 (zh) 2021-07-01
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