WO2020262339A1 - Brosse à dents - Google Patents

Brosse à dents Download PDF

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Publication number
WO2020262339A1
WO2020262339A1 PCT/JP2020/024497 JP2020024497W WO2020262339A1 WO 2020262339 A1 WO2020262339 A1 WO 2020262339A1 JP 2020024497 W JP2020024497 W JP 2020024497W WO 2020262339 A1 WO2020262339 A1 WO 2020262339A1
Authority
WO
WIPO (PCT)
Prior art keywords
deformed
hard
axis direction
deformed portion
reversing
Prior art date
Application number
PCT/JP2020/024497
Other languages
English (en)
Japanese (ja)
Inventor
静香 川崎
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 JP2021526992A priority Critical patent/JP7433310B2/ja
Priority to CN202080043271.9A priority patent/CN114007464B/zh
Priority to KR1020217029152A priority patent/KR20220029542A/ko
Publication of WO2020262339A1 publication Critical patent/WO2020262339A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • A46B5/0029—Head made of soft plastics, rubber or rubber inserts in plastics matrix
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/06—Brush bodies; Handles integral with brushware in the form of tapes, chains, flexible shafts, springs, mats or the like
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the present invention relates to a toothbrush.
  • the present application claims priority based on Japanese Patent Application No. 2019-12154 filed in Japan on June 28, 2019, the contents of which are incorporated herein by reference.
  • Root caries is caries of dentin exposed by gingival recession, but dentin has a higher composition ratio of organic components than enamel, so caries progresses faster.
  • One of the causes of the gingival recession is overbrushing, in which brushing is performed at a brushing pressure (sweeping pressure) larger than the appropriate value.
  • the toothbrush described in Patent Document 1 has a U-shape in which, when brushed by gripping with a palm grip, the portion formed of the thermoplastic resin of the portion gripped by the thumb and index finger of the handle portion opens toward the flocked surface side.
  • the periphery of the formed portion formed of the thermoplastic resin is coated with a soft resin such as an elastomer material.
  • 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 good operability of firmly polishing a target portion while maintaining an appropriate brushing pressure.
  • a head portion provided on the tip side in the long axis direction and having a hair-planted surface, a grip portion arranged on the rear end side of the head portion, the hair-planted surface and the grip portion.
  • the head portion and the neck portion are formed of at least a part of hard resin, are arranged in the grip portion, and have a neck portion arranged between the head portion and the neck portion in a first direction orthogonal to the flocked surface.
  • a deformed portion that is deformed by an external force, a first region that is arranged on the tip side of the deformed portion and is not deformed by an external force in the first direction, and a rear end side of the deformed portion that is arranged in the first direction.
  • the grip portion has at least one in a cross section orthogonal to the long axis direction from at least the tip of the grip portion to the second region in the long axis direction.
  • the portion is formed of the hard resin
  • the deformed portion includes a hard portion formed of the hard resin connecting the first region and the second region and at least a part of the hard portion formed of a soft resin. Occupation of the cross-sectional area of the hard portion with respect to the cross-sectional area of the closed space having the soft portion to be covered and surrounded by the outer contour of the deformed portion or the extension line of the outer contour in the cross section orthogonal to the major axis direction.
  • the ratio is 35% or less over the long axis direction, and the deformed portion has a bending strength in the first direction higher than the bending strength in the long axis direction and the second direction orthogonal to the first direction.
  • the soft portion is regulated to be small, and the soft portion has a concave-convex structure portion in which a concave portion and a convex portion extending in a direction intersecting the long-axis direction are arranged adjacent to each other in the long-axis direction.
  • a toothbrush characterized in that it is provided so as to be exposed on the fluffed surface side in the first direction and the back surface side opposite to the fluffed surface side in the first direction.
  • the depth of the concave portion with respect to the convex portion is 2% or more and 20% or less with respect to the maximum thickness of the deformed portion in the first direction. It is a feature.
  • the deformed portion has a polygonal cross section orthogonal to the major axis direction, and the concave-convex structure portion is provided on both sides of the deformed portion in the second direction. It is characterized by being.
  • the outermost outer shell of the deformed portion in the second direction is located on the back surface side of the center position of the deformed portion in the first direction. ..
  • the deformed portion is branched in the second direction through a through hole penetrating in the first direction and extending in the long axis direction, and the deformed portion is branched.
  • the hard portion is branched through the through hole to form a core portion connecting the first region and the second region
  • the soft portion is branched through the through hole to cover the periphery of the core portion. It is characterized by having a covering portion to be formed.
  • the hard portion is separated from the core portion, penetrates the through hole in the long axis direction, and has an inversion portion connecting the first region and the second region.
  • the reversing portion is characterized in that when an external force in the first direction exceeds a threshold value, the reversing portion jumps, buckles and reverses.
  • the hard portion has a flat plate shape, and the length of the hard portion in the second direction is larger than the length of the hard portion in the first direction. It is characterized by.
  • the center of the hard portion in the first direction is located on the back surface side of the center position of the deformed portion in the first direction.
  • the length of the deformed portion in the major axis direction is 15 mm or more and 30 mm.
  • the length of the deformed portion in the second direction is 5 mm or more and 20 mm or less.
  • the present invention can provide a toothbrush capable of accurately brushing the dentition one tooth at a time while maintaining an appropriate brushing pressure.
  • FIG. 1 shows the embodiment of this invention, and is the front view of the toothbrush 1 which concerns on 1st Embodiment. It is sectional drawing which cut
  • FIGS. 1 to 6 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. Further, in the following description, the side orthogonal to the flocked surface in the side view is defined as the thickness direction, the flocked surface side in the thickness direction is the front side, and the side opposite to the flocked surface is the back side.
  • FIG. 1 is a front view of the toothbrush 1.
  • FIG. 2 is a cross-sectional view of the toothbrush 1 cut along a plane including the center in the width direction (vertical direction in FIG. 1).
  • the toothbrush 1 of the present embodiment has a head portion 10 arranged on the tip side in the long axis direction (hereinafter, simply referred to as the tip side) and having a bristles (not shown) implanted, and the length of the head portion 10.
  • a grip portion 30 (hereinafter, head portion 10) having a neck portion 20 extending to the rear end side in the axial direction (hereinafter, simply referred to as the rear end side) and a deformed portion 70 extending to the rear end side of the neck portion 20.
  • the neck portion 20 and the grip portion 30 are collectively referred to as a handle body 2).
  • the toothbrush 1 of the present embodiment is a molded body in which a hard portion H formed of a hard resin and a soft portion E formed of a soft resin are integrally molded.
  • the hard portion H constitutes at least a part of each of the grip portion 30 including the head portion 10, the neck portion 20, and the deformed portion 70.
  • the soft portion E constitutes a part of the grip portion 30 including the deformed portion 70.
  • the head portion 10 and the neck portion 20 of the present embodiment are each made of a hard resin, but a part of the surface is covered with the soft resin, for example, a part of the soft resin is used. It may be made of resin.
  • a part of the grip portion 30 including the deformed portion 70 of the present embodiment is formed of both a hard resin and a soft resin (details will be described later).
  • the head portion 10 has a flocked surface 11 on one side in the thickness direction (direction orthogonal to the paper surface in FIG. 1).
  • the direction orthogonal to the thickness direction and the major axis direction will be referred to as the width direction (or, as appropriate, the side surface direction).
  • a plurality of flocked holes 12 are formed on the flocked surface 11. Hair follicles (not shown) are planted in the hair-implanted holes 12.
  • the width of the head portion 10, that is, the length in the width direction parallel to the flocked surface 11 on the front side and orthogonal to the long axis direction (hereinafter, simply referred to as width) is not particularly limited, and is, for example, 7 mm or more and 13 mm or less. Is preferable. When it is at least the above lower limit value, a sufficient area for planting hair bundles can be secured, and when it is at least the above upper limit value, operability in the oral cavity can be further enhanced.
  • the length of the head portion 10 in the major axis direction (hereinafter, simply referred to as a length) is not particularly limited, and is preferably 10 mm or more and 33 mm or less, for example.
  • a length of the head portion 10 is at least the above lower limit value, a sufficient area for planting hair bundles can be secured, and when it is at least the above upper limit value, the operability in the oral cavity can be further enhanced.
  • the boundary between the neck portion 20 and the head portion 10 in the long axis direction in the present embodiment is a position where the width of the neck portion 20 is the minimum value from the neck portion 20 toward the head portion 10.
  • the length of the neck portion 20 and the head portion 10 The boundary in the axial direction is the position closest to the tip of the head where the width of the neck portion 20 is the minimum value.
  • the length of the head portion 10 in the thickness direction (hereinafter, simply referred to as thickness) can be determined in consideration of the material and the like, and is preferably 2.0 mm or more and 4.0 mm or less.
  • thickness can be determined in consideration of the material and the like, and is preferably 2.0 mm or more and 4.0 mm or less.
  • the strength of the head portion 10 can be further increased.
  • the thickness of the head portion 10 is not more than the above upper limit value, the reachability to the back of the molars can be enhanced and the operability in the oral cavity can be further enhanced.
  • a hair bundle is a bundle of multiple hairs.
  • the length (hair length) from the flocked surface 11 to the tip of the hair bundle can be determined in consideration of the hair waist and the like required for the hair bundle, and is, for example, 6 to 13 mm. All hair bundles may have the same hair length or may be different from each other.
  • the thickness of the hair bundle (hair bundle diameter) can be determined in consideration of the hair waist and the like required for the hair bundle, and is, for example, 1 to 3 mm. All hair bundles may have the same hair bundle diameter or may be different from each other.
  • 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 of the hair from the flocked surface 11 toward the tip of the hair is approximately the same.
  • Examples thereof include the same hair (straight hair).
  • Examples of straight hair include those in which the tips of the hair are flat and substantially parallel to the flocked surface 11, and those in which the tips of the hair are hemispherically rounded.
  • the material of the hair is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT). ), Polyesters such as polyethylene terephthalate (PEN) and polybutylene naphthalate (PBN), polyolefins such as polypropylene (PP), polyolefin-based elastomers, elastomer resins such as styrene-based elastomers, and the like. These resin materials can be used alone or in combination of two or more. Further, as the hair, a polyester hair having a multi-core structure having a core portion and at least one or more layers of sheath portions provided on the outside of the core portion can be mentioned.
  • polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • the cross-sectional shape of the hair is not particularly limited, and may be a circular shape such as a perfect circle or an ellipse, a polygonal shape, a star shape, a three-leaf clover shape, a four-leaf clover shape, or the like.
  • the cross-sectional shape of all hairs may be the same or different.
  • the length of the neck portion 20 is preferably 40 mm or more and 70 mm or less in terms of operability.
  • the width of the neck portion 20 is formed so as to gradually increase from the position where the minimum value is obtained to the rear end side.
  • the neck portion 20 in the present embodiment is formed so as to gradually increase from the position where the width becomes the minimum value toward the rear end side. Further, the neck portion 20 is formed so that the thickness gradually increases from the minimum position toward the rear end side.
  • the width and thickness of the neck portion 20 at the minimum position are preferably 3.0 mm or more and 4.5 mm or less. If the width and thickness of the neck portion 20 at the minimum position is at least the above lower limit value, the strength of the neck portion 20 can be further increased, and if it is at least the above upper limit value, the lips can be easily closed and reach the back teeth. As well as enhancing the sexuality, the operability in the oral cavity can be further enhanced.
  • the width and thickness of the neck portion 20 formed so as to gradually increase from the position where the minimum value becomes toward the rear end side can be appropriately determined in consideration of the material and the like.
  • the front side of the neck portion 20 in the side view is inclined toward the front side toward the rear end side.
  • the back side of the neck portion 20 in the side view is inclined toward the back side toward the rear end side.
  • the neck portion 20 is inclined in a direction in which the distance from the center in the width direction increases toward the rear end side in the front view.
  • the boundary between the neck portion 20 and the grip portion 30 in this embodiment is the position of the tip of the neck side 20 where the deformed portion 70 described later is provided.
  • the width is expanded from the neck portion 20 toward the grip portion 30 with an arcuate contour in both front view and side view, and the position of the center of curvature of the arc coincides with the changed position in the long axis direction.
  • the boundary between the neck portion 20 and the grip portion 30 (deformed portion 70) is a long axis in which the center of curvature changes from the outside of the arcuate contour to the center side in the width direction in the front view shown in FIG. It matches the position of the direction.
  • the boundary between the neck portion 20 and the grip portion 30 is in the major axis direction in which the center of curvature changes from the outside of the arcuate contour to the center side in the thickness direction in the side view shown in FIG. It matches the position.
  • the grip portion 30 is arranged along the long axis direction.
  • the grip portion 30 has a deformed portion 70 on the tip end side forming a boundary with the neck portion 20.
  • the width of the grip portion 30 on the rear end side of the deformed portion 70 gradually narrows from the boundary with the deformed portion 70 toward the rear end side, and then extends to a substantially constant length.
  • the thickness of the grip portion 30 on the rear end side of the deformed portion 70 gradually narrows from the boundary with the deformed portion 70 toward the rear end side, and then extends to a substantially constant length. ing.
  • the positions in the major axis direction become substantially constant after gradually narrowing from the boundary toward the rear end side are the same.
  • the position of the rear end of the deformed portion 70 in the present embodiment is defined as the boundary between the soft portion 70E and the hard portion 30H.
  • the grip portion 30 has a soft portion 31E in the center in the width direction on the front end side on the rear end side of the deformed portion 70 on the rear end side end portion.
  • the soft portion 31E constitutes a part of the soft portion E.
  • the soft portion 31E gradually narrows from the rear end side end portion of the deformed portion 70 toward the rear end side in the front view, and then extends at a substantially constant length.
  • the side edge of the soft portion 31E and the lateral edge of the grip portion 30 on the outer side in the width direction are formed at a substantially constant distance.
  • the grip portion 30 has a hard portion 70H (see FIGS. 2 to 4) provided in the deformed portion 70 and a hard portion 30H provided on the rear end side of the deformed portion 70.
  • the hard portions 30H and 70H form a part of the hard portion H.
  • the hard portion 30H has a recess 31H in which the soft portion 31E is embedded on the front side.
  • the recess 31H gradually narrows from the rear end to the rear end side of the deformed portion 70 in the front view, and then extends in the major axis direction with a substantially constant length.
  • a part of the soft portion 31E embedded in the recess 31H protrudes from the hard portion 30H exposed on the front side.
  • the other soft portion 31E is substantially flush with the hard portion 30H exposed on the front side.
  • the grip portion 30 has a soft portion 32E in the center in the width direction on the back surface side (see FIGS. 1 and 2).
  • the soft portion 32E constitutes a part of the soft portion E.
  • the soft portion 32E has substantially the same outer contour as the outer contour of the soft portion 31E when viewed from the front. That is, the soft portion 32E gradually narrows from the rear end to the rear end side of the deformed portion 70, and then extends at a substantially constant length. In rear view, the side edge of the soft portion 32E and the lateral edge of the grip portion 30 on the outer side in the width direction are formed at a substantially constant distance.
  • the hard portion 30H has a recess 32H (see FIG. 2) in which a part of the soft portion 32E is embedded on the back surface side.
  • the recess 32H gradually narrows from the rear end to the rear end side of the deformed portion 70 in the rear view, and then extends at a substantially constant length.
  • a part of the soft portion 32E protrudes from the hard portion 30H exposed on the back surface side.
  • the other soft portion 32E is substantially flush with the hard portion 30H exposed on the front side.
  • the soft portion 31E is provided on the front side of the grip portion 30 and the soft portion 32E is provided on the back side, the grip property when gripping the grip portion 30 is improved.
  • the deformed portion 70 is deformed by an external force in the thickness direction orthogonal to the flocked surface 11.
  • the deformed portion 70 connects the neck portion (first region) 20 on the front end side and the grip portion (second region) 30 on the rear end side.
  • the deformed portion 70 has a hard portion 70H and a soft portion 70E. As shown in FIGS. 1 and 2, the deformed portion 70 has knurled portions (concavo-convex structure portions) 101 to 104.
  • FIG. 3 is a cross-sectional view of the deformed portion 70 orthogonal to the long axis direction, and is a cross-sectional view taken along the line AA in FIG.
  • FIG. 4 is a cross-sectional view of the deformed portion 70 cut along a plane including the center in the width direction.
  • the hard portion 70H is surrounded by the soft portion 70E.
  • the maximum length of the deformed portion 70 in the major axis direction is preferably 15 mm or more and 30 mm or less.
  • the deformed portion 70 is a polygon in which the contour of the cross section orthogonal to the long axis direction is eccentric to the back surface side in the thickness direction.
  • the cross-sectional contour of the deformed portion 70 is a substantially hexagonal outer contour of the soft portion 70E in which the hard portion 70H is embedded.
  • two vertices arranged in the middle of the thickness direction are arranged on the back side of the center of the deformed portion 70 (soft portion 70E) in the thickness direction. There is.
  • the bending resistance in the width direction is large because the wall thickness at the apex position is large. Therefore, the deformed portion 70 is difficult to bend in the width direction.
  • the cross-sectional shape of the hard portion 70H is formed in a rectangular shape extending in the width direction and having a width larger than the thickness. Since the hard portion 70H has a width larger than the thickness, it has a bending behavior (anisotropy related to bending) that it is easy to bend in the thickness direction and difficult to bend in the width direction.
  • the deformed portion 70 has a hard portion 70H formed in a rectangular cross section having a width larger than the thickness and extending in the width direction, so that the bending strength in the thickness direction is restricted to be smaller than the bending strength in the width direction. Has been done.
  • the center position of the hard portion 70H in the thickness direction is arranged on the back side of the center position of the deformed portion 70 in the thickness direction. That is, the hard portion 70H is eccentrically arranged on the back surface side in the thickness direction.
  • the share of the cross-sectional area of the hard portion 70H with respect to the cross-sectional area of the outer contour of the deformed portion 70 or the closed space surrounded by the extension line of the outer contour in the cross section orthogonal to the major axis direction is 35% over the major axis direction. It is as follows. As shown in FIG. 3, when the outer contour of the deformed portion 70 forms a closed space, the area of the closed space is the cross-sectional area of the deformed portion 70.
  • the occupancy rate in the previous term is preferably 25% or less, more preferably 15% or less. Moreover, the occupancy rate is preferably 3% or more.
  • the knurled portions 101 to 104 are provided so as to be exposed on the front side, the back side, and the side edges on both sides in the width direction of the deformed portion 70, respectively. More specifically, the knurled portion 101 is provided so as to be exposed to the soft portion 70E on the front side of the deformed portion 70. The knurled portion 102 is provided so as to be exposed on the soft portion 70E on the back side of the deformed portion 70.
  • the knurled portions 101 and 102 have recesses 111 and convex portions 112 that extend in a direction intersecting the major axis direction and are arranged adjacent to each other in the longitudinal direction.
  • the concave portion 111 and the convex portion 112 in the present embodiment extend in the width direction. That is, the recess 111 has a groove shape extending in the width direction.
  • the convex portion 112 is a protrusion extending in the width direction.
  • the cross section of the recess 111 cut in a plane including the center in the width direction has an arc shape recessed toward the center in the thickness direction.
  • the cross section of the convex portion 112 cut in a plane including the center in the width direction is an arc shape protruding outward in the thickness direction.
  • the deformed portion 70 By providing a plurality of recesses 111 forming thin-walled portions extending in the width direction on the front side and the back surface side of the deformed portion 70 in the major axis direction, the deformed portion 70 easily bends to the back surface side and the front side with the recess 111 as the center. .. Therefore, it is preferable that the positions of the recesses 111 in the long axis direction are the same in the knurled portions 101 and 102.
  • the depth of the concave portion 111 with respect to the convex portion 112 is 2% or more and 20% with respect to the maximum thickness of the deformed portion 70.
  • the following is preferable. If the depth of the recess 111 is less than 2% of the maximum thickness of the deformed portion 70, the deformation of the deformed portion 70 in the thickness direction may not be effectively exhibited. If the depth of the recess 111 exceeds 20% with respect to the maximum thickness of the deformed portion 70, the grip portion 30 may easily bend and the operability may be impaired. Therefore, by setting the depth of the recess 111 to 2% or more and 20% or less with respect to the maximum thickness of the deformed portion 70, it is easy to bend the deformed portion 70 to the back side and the front side while ensuring operability. Become.
  • the depth of the recess 111 in the knurled portion 101 and the depth of the recessed 111 in the knurled portion 102 may be different, but the viewpoint that the operability and the bending characteristic in the thickness direction are the same on the front side and the back side. Therefore, it is preferable that the depths of the recesses 111 are the same.
  • the maximum width of the knurled portions 101 and 102 that is, the maximum width of the deformed portion 70 is preferably 8 mm or more and 20 mm or less. If the maximum width of the deformed portion 70 is less than 8 mm, the grip portion 30 may easily bend and the operability may be impaired. Further, if the maximum width of the deformed portion 70 exceeds 20 mm, the bending of the deformed portion 70 in the thickness direction may not be effectively exhibited. Therefore, by setting the maximum widths of the knurled portions 101 and 102 to 8 mm or more and 20 mm or less, the deformed portion 70 can be easily bent toward the back side and the front side while ensuring operability.
  • the arrangement pitch RP of the concave portions 111 and the convex portions 112 in the knurled portions 101 and 102 in the major axis direction is preferably 9% or more and 26% or less of the length in the major axis direction of the deformed portion 70. If the sequence pitch RP is less than 9%, the bending of the deformed portion 70 may not be sufficiently developed. If the array pitch RP exceeds 26%, the deformed portion 70 may bend too much and the operability may be impaired.
  • the knurled portion 103 is provided so as to be exposed on the soft portion 70E of the side edge of the deformed portion 70 on one side in the width direction (upper side in FIG. 1).
  • the knurled portion 104 is provided so as to be exposed on the soft portion 70E of the side edge of the deformed portion 70 on the other side in the width direction (lower side in FIG. 1).
  • the knurled portions 103 and 104 have recesses 113 and convex portions 114 that extend in a direction intersecting the major axis direction and are arranged adjacent to each other in the longitudinal direction (FIG. 4). In 4, only the knurled portion 103 is shown).
  • the concave portion 113 and the convex portion 114 in the present embodiment extend in the thickness direction. That is, the recess 113 has a groove shape extending in the thickness direction.
  • the convex portion 114 is a protrusion extending in the thickness direction.
  • the recess 113 has an arc shape recessed toward the center in the width direction.
  • the convex portion 114 has an arc shape protruding outward in the width direction.
  • the positions of the recesses 113 in the long axis direction are the same in the knurled portions 103 and 104.
  • the depth of the concave portion 111 with respect to the convex portion 114 is 2% or more and 20% or less with respect to the maximum width of the deformed portion 70. Is preferable.
  • the depth of the recess 113 is less than 2% with respect to the maximum width of the deformed portion 70, the decrease in resistance when the deformed portion 70 bends in the thickness direction becomes small, and the bending of the deformed portion 70 in the thickness direction becomes small. It may not be expressed effectively.
  • the grip portion 30 may easily bend and the operability may be impaired. Therefore, by setting the depth of the recess 113 to 2% or more and 20% or less with respect to the maximum width of the deformed portion 70, the deformed portion 70 can be easily bent toward the back side and the front side while ensuring operability. ..
  • the depth of the recess 113 in the knurled portion 103 and the depth of the recess 113 in the knurled portion 104 may be different, but the operability and the bending characteristics in the width direction are the same on one side and the other side in the width direction. From this point of view, it is preferable that the depths of the recesses 113 are the same.
  • the depth of the recess 111 in the knurled portions 101 and 102 arranged in the thickness direction and the depth of the recessed 113 in the knurled portions 103 and 104 arranged in the width direction may be the same, but from the viewpoint of facilitating bending in the thickness direction. It is preferable that the recess 111 is deeper than the recess 113.
  • the convex portions 112 and 114 are provided around the deformed portion 70 at intervals (recesses 111 and 113) in the long axis direction, the gripability when gripping the deformed portion 70 is improved.
  • the knurled portions 101 and 102 are not limited to the flatfish knurled structure in which the direction in which the concave portion 111 and the convex portion 112 extend is orthogonal to the long axis direction in which the concave portion 111 and the convex portion 112 are aligned.
  • the angle of intersection between the direction in which the concave portion 111 and the convex portion 112 extends and the direction in which the convex portion 112 extends is other than 90 degrees, the direction in which the concave portion 111 and the convex portion 112 extend and the major axis direction intersect at a first angle and are long.
  • the long axis intersects the first lorette group arranged in the axial direction, the direction in which the concave portion 111 and the convex portion 112 extend, and the long axis direction at a second angle that is line-symmetric with the first angle centered on the long axis direction.
  • An Aya-me lorette structure in which a second lorette group arranged in a direction is provided may be adopted.
  • the first angle is the first when the deformed portion 70 bends to the back side and the front side with the recess 111 as the center.
  • the resistance of the knurled group and the second knurled group is the same, and it is possible to prevent the deformed portion 70 from bending in the direction intersecting the thickness direction.
  • the knurled portions 103 and 104 may be configured to adopt a knurled structure.
  • the cross-sectional shapes of the concave portions 111, 113 and the convex portions 112, 114 are not limited to the arc shape, and may be, for example, a rectangular shape, a V shape, or the like.
  • the cross-sectional shapes of the recesses 111 and 113 include corners, the corners may be stress-concentrated. Therefore, the cross-sectional shapes of the recesses 111 and 113 are preferably arcuate.
  • FIG. 5 is a partial front view of the deformed portion 70 around the hard portion 70H.
  • FIG. 6 is a partial side view of the deformed portion 70 around the hard portion 70H.
  • the hard portion 70H is formed in a rectangular shape in a plan view connecting the hard portion 20H which is the neck portion 20 in the long axis direction and the hard portion 30H on the rear end side of the deformed portion 70 in the grip portion 30.
  • the width of the hard portion 70H is formed to be smaller than the width of the hard portion 20H and the width of the hard portion 30H.
  • the hard portion 20H connected to the hard portion 70H constitutes a first region P1 in which the width, thickness and bending strength in the thickness direction are larger than those of the hard portion 70H and are rigid.
  • the hard portion 30H connected to the hard portion 70H constitutes a second region P2 in which the width, thickness and bending strength in the thickness direction are larger than those of the hard portion 70H and are rigid.
  • the proportion of the hard resin is larger than that of the soft resin in the cross section orthogonal to the long axis direction.
  • the front end side of the hard portion 70H is connected to the hard portion 20H (first region P1) by a curved surface 73H having an arc shape in a side view.
  • the rear end side of the front side of the hard portion 70H is connected to the hard portion 30H (second region P2) by a curved surface 74H having an arc shape in a side view.
  • the arc centers of the curved surfaces 73H and 74H are located on the front side of the hard portion 70H in the side view.
  • the front end side of the hard portion 70H on the back surface side is connected to the hard portion 20H by a curved surface 75H having an arc shape in a side view.
  • the rear end side of the hard portion 70H on the back surface side is connected to the hard portion 30H by a curved surface 76H having an arc shape in a side view.
  • the arc centers of the curved surfaces 75H and 76H are located on the back side of the hard portion 70H in a side view.
  • stress may be concentrated on the boundary between the front end side of the hard portion 70H and the hard portion 20H and the boundary between the rear end side of the hard portion 70H and the hard portion 30H.
  • the presence of the curved surfaces 73H to 76H alleviates the concentrated stress.
  • the thickness (minimum thickness) of the hard portion 70H is preferably 0.5 mm or more and 2.0 mm or less. If the thickness of the hard portion 70H is less than 0.5 mm, the deformed portion 70 is greatly deformed when an external force is applied to the head portion 10 to the back surface side, which may reduce the operability during brushing. When the thickness of the hard portion 70H exceeds 2.0 mm, it becomes difficult to bend when an external force is applied to the head portion 10 toward the back surface side. Further, when an external force is applied, it becomes difficult to put the hard portion 70H into a plane stress state, and the durability may decrease. Therefore, by setting the thickness of the hard portion 70H to 0.5 mm or more and 2.0 mm or less, the hard portion 70H can be put into a plane stress state while maintaining operability during brushing.
  • a hard resin having a flexural modulus (JIS7171) of 1500 MPa or more and 3500 MPa or less can be mentioned, and for example, a polyacetal resin (POM) can be mentioned.
  • the flexural modulus of the hard portion H is more preferably 2000 MPa or more and 3500 MPa or less.
  • the material of the soft portion E a material having a shore hardness A of 50 or more and 90 or less is preferable, and a shore hardness A is preferable, in that the load on the teeth and the like falls within an appropriate range even if the brushing load increases. More preferably, it is 60 or more and 80 or less. If the shore hardness A is less than 50, it may easily bend in the width direction.
  • the soft resin include elastomers (for example, olefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based thermoplastic elastomers, etc.) and silicones.
  • a styrene-based elastomer is preferable because it has excellent miscibility with a polyacetal resin.
  • the toothbrush 1 of the present embodiment is provided with the above-mentioned deformed portion 70 which has anisotropy in bending strength and is easily bent in the thickness direction and hard to be bent in the width direction. It is possible to suppress a decrease in deterioration and a decrease in operability. Further, the deformed portion 70 of the toothbrush 1 of the present embodiment has an appropriate elasticity as compared with the case where the hard portion 70H is embedded in the soft portion 70E and the deformed portion 70 is formed only by the hard portion. Even when the brushing pressure rises sharply, the load on the teeth and the like is suppressed. Further, as compared with the case where the deformed portion 70 is formed only of the soft portion, the deformed portion 70 immediately returns to the original shape when the load is released, and can cope with various movements of the head portion 10.
  • the occupancy ratio of the cross-sectional area of the hard portion 70H with respect to the cross-sectional area of the outer contour or the closed space surrounded by the extension line of the outer contour is 35 in the long axis direction. % Or less, and the bending strength in the thickness direction is regulated to be smaller than the bending strength in the width direction.
  • the deformed portion 70 is provided with knurled portions 101 and 102 exposed on the front side and the back side, which is appropriate. It is possible to maintain good operability that the target part can be polished firmly while maintaining a good brushing pressure.
  • the toothbrush 1 of the present embodiment since the knurled portions 103 and 104 exposed on both sides of the deformed portion 70 in the width direction are provided, the resistance when the deformed portion 70 bends in the thickness direction is reduced. This makes it easier to bend the deformed portion 70 in the thickness direction.
  • FIGS. 7 to 12 the same components as the components of the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof will be omitted.
  • FIG. 7 is a front view of the toothbrush 1 according to the second embodiment.
  • FIG. 8 is a cross-sectional view of the toothbrush 1 cut along a plane including the center in the width direction (vertical direction in FIG. 7).
  • the deformed portion 70 of the toothbrush 1 in the present embodiment has an inverted portion 80 and an elastic deformed portion 90.
  • FIG. 9 is a cross-sectional view of the deformed portion 70 at the center in the major axis direction and orthogonal to the major axis direction, and is a sectional view taken along line BB in FIG.
  • FIG. 10 is a cross-sectional view of the deformed portion 70 cut along a plane including the center in the width direction.
  • the reversing portion 80 and the elastically deformed portion 90 connect the neck portion (first region) 20 on the tip side of the deformed portion 70 and the grip portion (second region) 30 on the rear end side of the deformed portion 70, respectively.
  • the elastically deformed portions 90 are provided with gaps S on both sides of the reversing portion 80 in the width direction.
  • the gap S is formed by a through hole K penetrating in the thickness direction.
  • the through hole K is formed in a rectangular shape in a plan view extending in the long axis direction. That is, the deformed portion 90 is branched in the width direction through the through hole K, and each of the branched deformed portions 70 forms the elastic deformed portion 90.
  • the reversing portion 80 can be inverted (easily inverted) without interfering with the surrounding structure. Further, since the elastically deformed portion 90 and the reversing portion 80 do not interfere with each other, the deformation of the reversing portion 80 does not follow the deformation of the elastically deformed portion, so that the functional roles (described later) of the reversing portion 80 and the elastically deformed portion 90 are made independent. be able to. As a result, for example, the degree of freedom in design for obtaining the following effects can be increased. For example, vibration / sound when the reversing unit 80, which will be described later, is reversed can be clearly generated.
  • the repulsive force of the reversing portion 80 until the magnitude of the external force reaches the threshold value can be increased in proportion to the displacement amount, and the proportional relationship can be maintained particularly even in the vicinity of the threshold value.
  • the degree of increase in the repulsive force of the reversing portion 80 does not become loose.
  • the pressure assumed by the user is directly reflected in the repulsive force of the reversing portion 80, so that the brushing load can be appropriately controlled. .. If the magnitude of the external force is set to gradually decrease near the threshold value, the user may unintentionally continue brushing at a pressure near the upper limit.
  • the effect is further improved. Further, by expanding the gap S in the thickness direction, the vector of the load applied to the brush portion (brush) at the time of brushing, the opening direction of the gap, and the deformation direction of the reversing portion 80 and the elastic deforming portion 90 are parallel. (See FIG. 9), and it becomes easy to link the generation of vibration and sound due to inversion with the brushing load.
  • the movable region of the elastically deformed portion 90 which is responsible for the bending function of the toothbrush skeleton with respect to the load at the time of brushing can be further expanded.
  • the tensile behavior on the front surface and the compression behavior on the back surface due to bending are not easily hindered.
  • the through hole K does not exist between the elastically deformed portion 90 and the reversing portion 80, the movable region of the elastically deformed portion 90 becomes narrow.
  • the reversing unit 80 is not given an opportunity to reverse in an appropriate load range, and the reversing unit 80 is inverted before reaching an appropriate load range, or the inversion unit 80 is not inverted even in an appropriate load range. is assumed.
  • the threshold value for reversing the reversing portion 80 which will be described later, can be controlled in a finer range.
  • the gap S does not have to penetrate in the thickness direction, and may be formed, for example, by a closed cavity extending in the major axis direction inside the elastically deformed portion 90. Further, it may be formed by a recess (described later) that opens on the front side or the back side.
  • Each elastically deformed portion 90 has a hard portion (core portion) 90H and a soft portion (covering portion) 90E. As shown in FIG. 7, the soft portion 90E connects the rear end of the neck portion 20 and the grip portion 30 on the rear end side of the deformed portion 70. As shown in FIGS. 9 and 10, between the pair of elastically deformed portions 90, a recess (recess) 71 that opens on the front side and a recess (recess) 72 that opens on the back side are provided. The bottoms of the recess 71 and both ends in the width direction of the recess 72 are connected to the through holes K, respectively.
  • An inversion portion 80 is exposed and provided at the bottom of the recess 71 and the center of the recess 72 in the width direction.
  • the movable region of the elastically deformed portion 90 which is responsible for the bending function of the toothbrush skeleton with respect to the load during brushing can be further expanded, and the bending anisotropy in the thickness direction can be improved. it can.
  • the recesses between the pair of elastically deformed portions 90 may not penetrate in the thickness direction, and may be opened in only one of the thickness directions. Further, for example, a closed cavity extending in the long axis direction may be formed inside the elastic deformation portion 90, and a pair of elastic deformation portions 90 may be formed in the width direction with the cavity in the center.
  • the ends of the soft portions 90E in the major axis direction are connected in the width direction on both the front side and the back surface side.
  • the soft portions 90E of the pair of elastically deformed portions 90 are provided around the oval recesses 71 and 72 when viewed from the front.
  • the rear end side of the soft portion 90E is connected to the soft portion 31E of the grip portion 30. Since the soft portion 90E is connected in the width direction on both the front end side and the rear end side of the elastically deformed portion 90, stress is less likely to be concentrated on the end of the hinge structure even if the inversion is repeated, and the bending is less likely to occur.
  • the soft portions 90E are connected in the width direction on both the front end side and the rear end side of the elastic deformation portion 90, the anisotropy in the deformation portion 70 is enhanced, and the pair of elastic deformation portions 90 with respect to the movement during brushing. , It becomes possible to bend without twisting in the thickness direction. Further, since the soft portion 90E is connected in the width direction, the amount of heat possessed by the soft resin (elastomer) during injection molding increases, so that the adhesiveness between the neck portion 20 and the deformed portion 70 (adhesiveness between the neck portion 20 and the elastic deformed portion 90). ) Increases.
  • the extension line of the outer contour on the front side indicated by the alternate long and short dash line and the extension line of the outer contour on the back side indicated by the alternate long and short dash line are used.
  • the area of the closed space surrounded by the outer contour including the outer contour is the cross-sectional area of the deformed portion 70.
  • FIG. 11 is a partial front view of the deformed portion 70 around the hard portion 70H.
  • the hard portion 70H has through holes 73 provided on both sides of the reversing portion 80 in the width direction.
  • the through holes 73 extend in the major axis direction, respectively.
  • the length of the through hole 73 in the major axis direction is a length that is separated from the ends of the hard portions 20H and 30H, respectively.
  • a soft portion 90E is provided near the hard portion 90H in the width direction
  • a through hole K is formed near the reversing portion 80 in the width direction.
  • the reversing portion 80 Can maintain the shape of.
  • the inverted portion 80 of the deformed portion 70 is inverted in an attempt to release the accumulated strain energy.
  • the hard portion 70H is connected to the neck portion 20 and the grip portion 30 only by the reversing portion 80, the energy cannot be stored and the portion is immediately inverted.
  • the reversing portion 80 When the reversing portion 80 is integrally injection-molded with the first portion A1 and the second portion A2, which will be described later, the neck portion 20, the grip portion 30, and the hard portion 70H, the accumulated strain energy is transferred to the reversing portion 80. Can be efficiently transmitted to.
  • the hard portion 90H is formed outside the through hole 73 in the width direction of the hard portion 70H. As shown in FIG. 9, the hard portion 90H has a substantially rectangular cross-sectional shape in which the long side extends in the width direction.
  • the hard portion 90H is embedded in the soft portion 90E with its periphery covered. Since the hard portion 90H is embedded in the soft portion 90E, the stress applied to the hard portion 90H can be relaxed from the viewpoint of strength. Further, from the viewpoint of the degree of bending of the toothbrush 1 with respect to the load, it is possible to control the elastic behavior of the elastically deformed portion 90.
  • the bending anisotropy in the deformed portion 70 is increased, and for example, the elastic deformed portion 90 is not twisted in the thickness direction with respect to the movement during brushing. It can be bent.
  • the pair of hard portions 90H are arranged at the same position in the thickness direction. Since the pair of hard portions 90H are arranged at the same position in the thickness direction, the anisotropy in the deformed portion 70 is enhanced, and the pair of elastically deformed portions 90 is opposed to the movement during brushing with respect to the thickness direction. It is possible to bend without twisting. Further, the position of the hard portion 90H in the thickness direction is preferably on the back surface side of the position where the thickness of the elastically deformed portion 90 is halved. Since the elastically deformed portion 90 is on the back side of the position where the thickness is halved, it is possible to ensure the ease of bending in the thickness direction while ensuring the behavior of immediately returning to the original shape when the load is released. ..
  • the width of the hard portion 90H is preferably 2.0 mm or more. By setting the width of the hard portion 90H to 2.0 mm or more, bending in the width direction can be suppressed.
  • the thickness of the hard portion 90H is preferably 2.0 mm or less. By setting the thickness of the hard portion 90H to 2.0 mm or less, it becomes easy to repeatedly bend in the thickness direction.
  • the width of the hard portion 90H is preferably larger than the thickness of the hard portion 90H from the viewpoint that the elastically deformed portion 90 is less likely to bend in the width direction than in the thickness direction.
  • both the elastically deformed portion 90 and the front end side and the rear end side of the reversing portion 80 can be flexibly deformed (which triggers reversal).
  • the degree of deformation of the elastically deformed portion 90 can be sensed in more detail).
  • the minimum distance between the hard portion 90H and the outer contour in the width direction of the deformed portion 70, that is, the minimum thickness (thickness) of the soft portion 90E outside the hard portion 90H in the width direction is 1.0 mm or less. preferable. By setting the minimum thickness of the soft portion 90E to 1.0 mm or less, bending in the width direction can be suppressed.
  • the shore hardness A is 50 or more and 90 or less, as an example, in that the load on the teeth and the like remains within an appropriate range even if the brushing load increases until the jumping buckling occurs.
  • the shore hardness A is preferably 60 or more and 80 or less.
  • the deformed portion 70 of the toothbrush 1 of the present embodiment has an elastic deformed portion 90 in which the hard portion 90H is embedded in the soft portion 90E, and the elastic deformed portion 90 is appropriately formed as compared with the case where the elastic deformed portion 90 is formed only by the hard portion. Because of its elasticity, the load on the teeth and the like is suppressed even when the brushing pressure rises sharply. Further, as compared with the case where the elastically deformed portion 90 is formed only of the soft portion, the elastic deformed portion 90 immediately returns to the original shape when the load is released, and can cope with various movements of the head portion 10.
  • the pair of elastically deformed portions 90 are arranged side by side in the width direction, the bending in the width direction is suppressed with respect to the load in the thickness direction, so that the bending due to twisting can also be suppressed. As a result, it is possible to suppress the above-mentioned decrease in cleaning power and decrease in operability.
  • the pair of elastically deformed portions 90 are arranged side by side in the width direction, the bending in the width direction is suppressed with respect to the load in the thickness direction, so that the bending due to twisting can also be suppressed. As a result, it is possible to suppress the above-mentioned decrease in cleaning power and decrease in operability.
  • the reversing portion 80 extends in the long axis direction in the front view, and the first portion A1 on the front end side of the through hole 73 and the second portion A1 on the rear end side of the through hole 73 in the hard portion 70H. It is a second hard part that connects the part A2.
  • the reversing portion 80 is in a first stable state (hereinafter, first state) shown in FIG. 10 in which an external force to the back surface side is not applied to the head portion 10 (or an external force equal to or less than a predetermined threshold value described later is applied).
  • first state first stable state
  • it is formed in a substantially V shape in a side view that gradually inclines toward the back surface side from both ends in the long axis direction toward the center. That is, in the first state, the reversing portion 80 is formed in a convex shape on the back surface side where the center in the major axis direction is the apex.
  • a part of the reversing portion 80 overlaps with the hard portion 90H in the width direction in the first state. Further, as shown in FIG. 12, a part of the reversing portion 80 overlaps with the hard portion 90H in the width direction even in the second state described later. Since a part of the reversing portion 80 overlaps the hard portion 90H in the width direction in both the first state and the second state, the anisotropy in the deformed portion 70 increases, and the pair of elastic deformed portions 90 move during brushing. On the other hand, it is possible to bend without twisting in the thickness direction.
  • the elastically deformed portion 90 and the reversing portion 80 are elastically deformed according to the magnitude of the external force.
  • the knurled portion 101 bends toward the back surface while extending in the long axis direction.
  • the knurled portion 102 bends toward the back surface while being compressed in the long axis direction.
  • the knurled portions 101 and 102 are thinned in the thickness direction due to the presence of the recesses 111, and the front and back surfaces (front side and back side) of both branch portions are formed with irregularities at the same pitch in the width direction. , It can be easily bent to the back side without twisting in the thickness direction.
  • the knurled portions 103 and 104 are thin in the width direction due to the presence of the recess 111, the resistance when the deformed portion 70 bends in the thickness direction is reduced, and the deformed portion 70 is further bent toward the back surface side. It will be easier. Further, by extending the unevenness (concave portion 111 and convex portion 112) on the front and back sides (front side and back side) to the unevenness (concave portion 113 and convex portion 114) on the side surface portion, the unevenness is further twisted in the thickness direction. It can be bent without bending.
  • the elastically deformed portion 90 elastically deforms according to the magnitude of the external force exceeding the threshold value.
  • the reversing portion 80 jumps, buckles and reverses when the neck portion 20 is deformed, as shown by the alternate long and short dash line in FIG. It becomes the stable state of 2 (hereinafter referred to as the second state).
  • the second state the reversing portion 80 is reversed in a direction in which it gradually inclines toward the front side toward the center and becomes a substantially inverted V shape in side view.
  • the reversing portion 80 is formed in a convex shape on the front side where the center in the major axis direction is the apex.
  • the elastically deformed portion 90 elastically deforms, so that the inverted portion 80 jumps from the first state while the bending strength in the deformed portion 70 is secured. It shifts and buckles and reverses to the second state. Further, since the through hole K is provided between the reversing portion 80 and the elastically deforming portion 90, the reversing portion 80 and the elastically deforming portion 90 can be deformed independently of each other, and the reversing portion 80 can be easily inverted. Become.
  • the reversing portion 80 can be flexed after only the elastic member 90 is first flexed without hindering each other's deformation behavior. It should be noted that the inversion portion 80 and the elastically deformed portion 90 do not necessarily have to penetrate, and a gap S may be formed. Further, with respect to the load in the thickness direction on the head portion 10, the elastically deformed portion 90 can suppress the bending due to twisting by suppressing the bending in the width direction, so that the reversing portion 80 receives the load in the thickness direction. Can contribute to functioning accurately.
  • the reversing portion 80 it is necessary to store strain energy, but as described above, the bending in the width direction is suppressed with respect to the load in the thickness direction, so that the bending due to twisting is also suppressed. Therefore, the load during brushing can be efficiently converted into strain energy. Therefore, in the present embodiment, the reversing portion 80 can be clearly repeatedly buckled at an appropriate timing.
  • the reversing portion 80 has a groove portion 81 in the center in the long axis direction on the front side, that is, in a region including a convex apex.
  • the reversing portion 80 has a groove portion 82 at the center in the long axis direction on the back surface side, that is, in a region including a convex apex.
  • the grooves 81 and 82 extend in the width direction.
  • the groove 81 is formed in an arc shape in a side view in which the center of the arc is arranged on the front side.
  • the groove portion 82 is formed in an arc shape in a side view in which the center of the arc is arranged on the back surface side.
  • the reversing portion 80 When the reversing portion 80 is not provided with the grooves 81 and 82, stress is uniformly generated in the entire reversing portion 80, and jump buckling is less likely to occur. On the other hand, when the grooves 81 and 82 are provided in the reversing portion 80, stress is intensively generated in the grooves 81 and 82, and jump buckling is likely to occur.
  • the radius of the arc-shaped grooves 81 and 82 when viewed from the side is preferably 1 mm or more and 2 mm or less. If the radius of the grooves 81 and 82 is less than 1 mm, the reversing portion 80 may not be inverted. If the radii of the grooves 81 and 82 exceed 2 mm, the vibration of the reversing portion 80 at the time of reversing becomes small, and it may be difficult to detect that the reversing portion 80 is in the overbrushing state.
  • the groove portion 81 is deeper than the groove portion 82.
  • the reversing portion 80 is less likely to be inverted even when the magnitude of the external force exceeds a predetermined threshold value.
  • the reversing portion 80 can be guided so as to be more likely to jump and buckle on the front side.
  • the configuration may be such that both the groove portions 81 and 82 are not provided, and the groove portion 82 is not provided and only the groove portion 81 is provided.
  • the inversion portion 80 is provided with the groove portions 81 and 82 in the region including the convex apex, the region including the convex apex is thinner than the other regions. Therefore, the strain energy accumulated by the deformation of the reversing portion 80 due to the external force exceeding the threshold value can be instantly released starting from the groove portions 81 and 82, and the reversing portion 80 can be inverted. Further, as described above, since the deformed portion 70 has high anisotropy and is easily deformed in the thickness direction of the reversing portion 80, the strain energy accumulated by the deformation of the reversing portion 80 causes the reversing portion 80 to be deformed in the thickness direction. Can contribute to functions such as efficient reversal of. Further, the positions of the groove portions 81 and 82 in the thickness direction can be adjusted to adjust the position where the reversing portion 80 reverses from the first state to the second state.
  • the grooves 81 and 82 are formed in an arc shape in a side view, for example, as compared with the case where the grooves 81 and 82 are formed in a V shape on two intersecting planes, the inverted portion 80 including the grooves 81 and 82 is formed.
  • the stress concentration at the apex can be relaxed even when the apex moves in the thickness direction.
  • the threshold value of the external force applied to the head portion 10 on the back surface side is, for example, an upper limit value of an appropriate brushing pressure.
  • the angle ⁇ at which the reversing portion 80 is inclined with respect to the plane parallel to the major axis direction and the width direction is preferably 5 degrees or more and 11 degrees or less, and 7 degrees or more and 11 degrees. More preferably, it is less than or equal to the degree.
  • the inclination angle ⁇ is less than 5 degrees, the reversing portion 80 may jump and deform without buckling, which may make it difficult to detect the overbrushing state.
  • the inclination angle ⁇ exceeds 11 degrees, the reversing portion 80 jumps and buckles due to the overbrushing pressure, making it difficult to reverse, or when the reversing portion 80 jumps and buckles and reverses, the reversing portion 80 moves. It may break and lose its reversibility.
  • the thickness of the reversing portion 80 is preferably 1 mm or more and 2 mm or less excluding the groove portions 81 and 82. If the thickness of the reversing portion 80 is less than 1 mm, although it is deformed, it does not jump and buckle, and it may be difficult to detect that it is in an overbrushed state. If the thickness of the reversing portion 80 exceeds 2 mm, the reversing portion 80 jumps and buckles due to the overbrushing pressure, making it difficult to reverse, or the reversing portion 80 breaks when the reversing portion 80 jumps and buckles and reverses. There is a possibility that the reversibility will be lost.
  • the width of the reversing portion 80 is preferably 1.5 mm or more. If the width of the reversing portion 80 is less than 1.5 mm, it may easily bend in the width direction. Assuming that the maximum thickness of the reversing portion 80 is T (mm) and the maximum thickness of the deformed portion 70 is t (mm), an excessive brushing load is applied by specifying a value represented by T / t. At this time, it becomes possible to control the ease of inversion of the inversion unit 80 and its timing (threshold value).
  • the value represented by T / t is preferably 0.05 or more and 0.35 or less, and more preferably 0.10 or more and 0.35 or less.
  • the reversing part 80 When the value represented by T / t is less than 0.05, the reversing part 80 also deforms in a form that follows the bending of the deforming part 70 (elastic deforming part 90), but it does not jump and buckle, so overbrushing. It can be difficult to perceive that the condition is present. If the value represented by T / t exceeds 0.35, the reversible portion 80 jumps and buckles due to the overbrushing pressure, making it difficult to reverse, or when the reversible part buckles and reverses, it breaks. Therefore, the reversibility of the reversing part 80 may be lost.
  • the maximum width of the reversing portion 80 is L (mm) and the maximum width of the deformed portion 70 is W (mm)
  • L / W the maximum width of the deformed portion 70
  • the value represented by L / W is preferably 0.05 or more and 0.35 or less, and more preferably 0.10 or more and 0.35 or less.
  • the reversing portion 80 When the value represented by L / W is less than 0.05, the reversing portion 80 also deforms in a form that follows the bending of the deformed portion 70 (elastic deformed portion 90), but it does not easily jump and buckle, and is in an overbrushed state. It can be difficult to detect that. When the value represented by L / W exceeds 0.35, the reversing portion 80 is less likely to be deformed and reversed due to the bending of the handle body 2 that occurs in the range of normal brushing.
  • the reversing portion 80 jumps and buckles due to the overbrushing pressure to make it difficult to reverse, or when the reversing portion 80 jumps and buckles and reverses, it breaks and the reversibility of the reversing portion 80 is lost. .. That is, by setting T / t and L / W within the above ranges, the bending strength of the reversing portion 80 becomes flexible at a constant ratio with respect to the elastically deformed portion 90, and the bending of the elastically deformed portion 90 that bears the handle skeleton. On the other hand, the reversing unit 80 can be operated with a slight delay. Therefore, even when an excessive brushing load is applied, it is possible to control the ease of reversing of the reversing unit 80 and the timing (threshold value) that triggers the reversing unit 80 to reverse.
  • the length of the reversing portion 80 in the major axis direction is preferably 15 mm or more and 30 mm or less, more preferably 15 mm or more and 25 mm or less, and further preferably 15 mm or more and 20 mm or less.
  • the position of the tip side end portion of the reversing portion 80 is the position of the tip end side end portion of the through hole 73.
  • the position of the rear end side end portion of the reversing portion 80 is the position of the rear end side end portion of the through hole 73.
  • the reversing portion 80 is located between the outer contour of the flocked surface side 11 and the outer contour of the back surface side of the elastically deformed portion 90 in a side view. More specifically, the position of the reversing portion 80 in the thickness direction is set so as not to protrude from the thickness of the elastically deformed portion 90 in the side view so that the reversing portion 80 does not form the outermost outline of the toothbrush. For example, it is possible to prevent the reversing unit 80 from coming into contact with the user during use. Specifically, it is preferable that the elastically deformed portion 90 is on the back side of the position where the thickness is halved.
  • the apex of the reversing portion 80 is in the second state when the reversing portion 80 is inverted. Can reduce the possibility of protruding from the front surface of the elastically deformed portion 90 and coming into contact with the user's finger. Further, since the reversing portion 80 is arranged on the back side of the position where the thickness of the elastically deformed portion 90 is halved, the back side is compressed more than the front side when the reversing portion 80 is bent, for example. , The energy that triggers the inversion is likely to be accumulated, and the strain energy can be efficiently transferred to the inversion unit 80.
  • the flexural modulus of the hard resin constituting the reversing portion 80 is preferably 1500 MPa or more and 3500 MPa or less, and more preferably 2000 MPa or more and 3500 MPa or less.
  • the flexural modulus of the hard resin is less than 1500 MPa, the reversing portion 80 deforms but does not jump and buckle, and it may be difficult to detect that it is in an overbrushed state.
  • the flexural modulus of the hard resin exceeds 3500 MPa, the reversible portion 80 jumps and buckles due to the overbrushing pressure, making it difficult to reverse, or when the reversible buckles and reverses, it breaks and reverses. There is a possibility that the reversibility of the part 80 will be lost. Further, by using a material having a specified flexural modulus, vibrations due to jumping buckling are intensively generated in a short time and become sharp (sharp, large). As a result, the user can easily detect that it is overbrushing.
  • the moving distance of the convex apex in the thickness direction when the reversing portion 80 jumps and buckles is preferably 0.2 mm or more and 5.0 mm or less. If the moving distance of the apex in the thickness direction is less than 0.2 mm, the vibration at the time of jumping and buckling becomes small, and it may be difficult to detect the overbrushing state. When the moving distance of the apex in the thickness direction exceeds 5.0 mm, the reversible portion 80 jumps and buckles due to the overbrushing pressure, making it difficult to reverse, or when the reversible buckle and reverses. There is a possibility that it will break and the reversibility of the reversing portion 80 will be lost.
  • the vibration generated by the jump buckling occurs intensively in a short time and becomes sharp (sharp, large). As a result, the user can easily detect that it is overbrushing.
  • the thickness of the hard portion 90H in the elastically deformed portion 90 is preferably 2.0 mm or less, and the width is preferably larger than the thickness.
  • the thickness of the hard portion 90H is 2.0 mm or less, so that the hard portion 90H is less likely to generate internal stress.
  • the anisotropy of the bending behavior of the elastically deformed portion 90 can be clarified, and twisting can be made difficult.
  • the deforming portion 70 is more easily deformed on the front side and the back side, and is long. It can be in a plane stress state with almost no deformation in the axial and width directions. That is, in the toothbrush 1 of the present embodiment, the reversing portion 80 and the elastic deforming portion 90 are deformed in the thickness direction separated from each other in the width direction, and are not present on the same plane. In other words, the path of deformation of the elastically deformed portion 90 due to the external force in the thickness direction and the path of deformation of the reversing portion 80 due to the external force in the thickness direction are provided non-interferingly.
  • the elastically deformed portion 90 and the reversing portion 80 are less likely to be constrained by each other and can be deformed, so that the energy required for reversing the reversing portion 80 can be more sufficiently stored. , Stress is intensively generated in the reversing portion 80 (particularly the groove portions 81 and 82), and a sharp jump buckling is developed.
  • the pair of hard portions 90 in the elastically deformed portion 90 are arranged at the same position in the thickness direction, and a part of the reversing portion 80 with respect to the hard portion 90H is in the first state. Since they overlap in the width direction, for example, even when an external force in the width direction is applied to the head portion 10, twisting around the axis extending in the long axis direction is unlikely to occur. Therefore, in the toothbrush 1 of the present embodiment, the deformed portion 70 is less likely to be deformed in the width direction, and the bending strength can be increased.
  • the cross-sectional area of the space of the recesses 71 and 72 with respect to the maximum cross-sectional area of the deformed portion 70 (a pair of elastic deformed portions 90 from the maximum cross-sectional area of the deformed portion 70).
  • the space occupancy of the dents 71 and 72 represented by the ratio of the cross-sectional area of the above to the cross-sectional area of the inverted portion 80 is preferably 35% or more and 60% or less.
  • the maximum cross-sectional area of the deformed portion 70 is a cross section orthogonal to the long axis direction of the deformed portion 70 shown in FIG. 9, in which the outermost outer shell on the front side of the pair of elastic deformed portions 90 is virtually connected and a pair. It is an area of a figure formed by virtually connecting the outermost outer shells on the back surface side of the elastically deformed portion 90.
  • the occupancy rate is less than 35%, the occupancy rate of the elastically deformed portion 90 and the reversing portion 80 becomes large, and the bending strength toward the back surface side in the thickness direction becomes large during brushing. In this case, it is difficult to maintain an appropriate brushing pressure, and it may be difficult to suppress overbrushing.
  • the occupancy rate exceeds 60%, the occupancy rate of the elastically deformed portion 90 and the reversing portion 80 becomes small, and the bending strength in the width direction becomes small during brushing. In this case, during brushing, the deflection becomes large with respect to an external force in the width direction, and it may be difficult to accurately brush the dentition one tooth at a time.
  • Example 1 to 4 Samples of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared according to the specifications shown in [Table 1] below.
  • a toothbrush having no through hole and an inversion portion in the deformed portion (corresponding to the toothbrush shown in the first embodiment) was used as a sample.
  • Examples 3 to 4 and Comparative Example 3 a toothbrush having a through hole and an inversion portion in the deformed portion (corresponding to the toothbrush shown in the second embodiment) was used as a sample.
  • Comparative Example 4 a toothbrush of "Clinica Advantage 3-row normal" manufactured by Lion Corporation, which has no deformed portion, was used as a sample.
  • Example 2 a toothbrush having knurls provided on the front side and the back side (front and back) of the deformed portion was used as a sample.
  • Example 4 a toothbrush provided with knurls on both sides (left and right) in the width direction in addition to the front side and the back side (front and back) of the deformed portion was used as a sample.
  • sample 4 “the feeling that the excessive brushing load is relaxed”, “the feeling that the target part can be polished firmly”, and in Examples 3 to 4 that have the reversing part, "the reversing part is easy to jump and buckle”. Good evaluation was obtained for all of them.
  • Examples 2 to 4 in which the ratio of the depth of the concave portion to the convex portion in the knurled portion to the maximum thickness of the deformed portion is within the range of 2% or more and 20% or less.
  • a better evaluation was obtained for "the feeling of being able to polish the target part firmly” than in Example 1 in which the ratio was out of the range of 2% or more and 20% or less.
  • the sample of Example 4 having the uneven structure portion on both sides in the width direction in addition to the front side and the back side of the deformed portion "relaxes an excessive brushing load" with respect to the samples of Examples 1 to 3. "I feel like I'm doing it” has improved.
  • the present invention is not limited to this configuration, and for example, the knurled portions 103 and 104 on both sides in the width direction are not provided, and the front side and the front side and Only the knurled portions 101 and 102 may be provided on the back side.
  • the configuration in which the deformable portion 70 has the elastically deformed portion 90 and the reversing portion 80 is illustrated, but the configuration is not limited to this configuration, and the elastic deforming portion 90 and the reversing portion 80 are not provided. There may be.
  • a configuration in which a part of the recesses 71 and 72 penetrates in the thickness direction through the through hole K is illustrated, but the configuration is not limited to this configuration, and only one of the front side or the back side is opened. It may be.
  • the present invention can be applied to a toothbrush.

Landscapes

  • Brushes (AREA)

Abstract

L'objectif de la présente invention est de fournir une brosse à dents ayant une bonne aptitude au fonctionnement grâce à laquelle il est possible de brosser soigneusement un site cible tout en maintenant une pression de brossage appropriée. Cette brosse à dents comprend : une section déformable (70) qui est disposée sur une section de préhension (30) et qui est déformée par une force externe agissant dans une première direction orthogonale à une surface d'implantation de poils (11) ; et une première zone et une seconde zone non déformées par la force externe. La section déformable comprend une section dure (H) formée à partir d'une résine dure reliant la première zone et la seconde zone et une section flexible (E) formée à partir d'une résine flexible et recouvrant au moins une partie de la section dure. La proportion occupée par la zone en section transversale de la section dure par rapport à la zone en section transversale du contour externe de la section déformable ou d'un espace fermé entouré par les lignes étendues du contour externe est de 35 % ou moins le long de la direction d'axe long, la résistance à la flexion de la section déformable dans la première direction est limitée de manière à être inférieure à la résistance à la flexion dans une seconde direction orthogonale à la direction d'axe long et à la première direction, la section flexible a une structure en creux/saillie (101) dans laquelle des creux et des saillies s'étendant dans une direction croisant la direction d'axe long sont adjacents les uns aux autres et la structure en creux /saillie est exposée sur chacun du côté surface d'implantation de poils et du côté surface arrière dans la première direction.
PCT/JP2020/024497 2019-06-28 2020-06-23 Brosse à dents WO2020262339A1 (fr)

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JP2021526992A JP7433310B2 (ja) 2019-06-28 2020-06-23 歯ブラシ
CN202080043271.9A CN114007464B (zh) 2019-06-28 2020-06-23 牙刷
KR1020217029152A KR20220029542A (ko) 2019-06-28 2020-06-23 칫솔

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023020001A1 (fr) * 2021-08-20 2023-02-23 上海携福电器有限公司 Brosse à dents

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054154A (en) * 1989-07-15 1991-10-08 M & C Schiffer Gmbh Toothbrush with flexible head
US5630244A (en) * 1996-01-02 1997-05-20 Chang; Ching-Min Elastic toothbrush
JP3040913U (ja) * 1997-02-25 1997-09-05 順元成興業股▲ふん▼有限公司 歯ブラシ
WO2009081783A1 (fr) * 2007-12-26 2009-07-02 Lion Corporation Brosse interdentaire
JP2012100806A (ja) * 2010-11-09 2012-05-31 Sunstar Inc 歯ブラシ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000004944A (ja) * 1998-06-26 2000-01-11 Lion Corp 歯ブラシ
JP2002191434A (ja) * 2000-12-27 2002-07-09 Lion Corp 歯ブラシ
JP6478384B2 (ja) * 2014-09-25 2019-03-06 ライオン株式会社 歯ブラシ用ハンドル体及び歯ブラシ
JP6789075B2 (ja) * 2016-11-11 2020-11-25 ライオン株式会社 歯ブラシ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054154A (en) * 1989-07-15 1991-10-08 M & C Schiffer Gmbh Toothbrush with flexible head
US5630244A (en) * 1996-01-02 1997-05-20 Chang; Ching-Min Elastic toothbrush
JP3040913U (ja) * 1997-02-25 1997-09-05 順元成興業股▲ふん▼有限公司 歯ブラシ
WO2009081783A1 (fr) * 2007-12-26 2009-07-02 Lion Corporation Brosse interdentaire
JP2012100806A (ja) * 2010-11-09 2012-05-31 Sunstar Inc 歯ブラシ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023020001A1 (fr) * 2021-08-20 2023-02-23 上海携福电器有限公司 Brosse à dents

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JPWO2020262339A1 (fr) 2020-12-30
CN114007464A (zh) 2022-02-01
KR20220029542A (ko) 2022-03-08
CN114007464B (zh) 2023-07-25
TW202106201A (zh) 2021-02-16

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