WO2016035678A1 - Toothbrush - Google Patents

Toothbrush Download PDF

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Publication number
WO2016035678A1
WO2016035678A1 PCT/JP2015/074289 JP2015074289W WO2016035678A1 WO 2016035678 A1 WO2016035678 A1 WO 2016035678A1 JP 2015074289 W JP2015074289 W JP 2015074289W WO 2016035678 A1 WO2016035678 A1 WO 2016035678A1
Authority
WO
WIPO (PCT)
Prior art keywords
toothbrush
handle
soft
handle portion
exposed
Prior art date
Application number
PCT/JP2015/074289
Other languages
French (fr)
Japanese (ja)
Inventor
良祐 蜂須賀
愛 渡辺
篤人 木村
小林 利彰
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 CN202010310848.XA priority Critical patent/CN111358165B/en
Priority to KR1020167036429A priority patent/KR102577531B1/en
Priority to CN202010310829.7A priority patent/CN111480969B/en
Priority to CN202010310832.9A priority patent/CN111493506B/en
Priority to CN202010310721.8A priority patent/CN111449408B/en
Priority to CN201580046958.7A priority patent/CN106659289A/en
Priority to JP2016546601A priority patent/JP6591988B2/en
Publication of WO2016035678A1 publication Critical patent/WO2016035678A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B5/00Brush bodies; Handles integral with brushware
    • A46B5/002Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0054Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B5/00Brush bodies; Handles integral with brushware
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B5/00Brush bodies; Handles integral with brushware
    • A46B5/002Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0033Brush bodies; Handles integral with brushware having articulations, joints or flexible portions bending or stretching or collapsing
    • A46B5/0037Flexible resilience by plastic deformation of the material
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B9/00Arrangements of the bristles in the brush body
    • A46B9/02Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04Arranged like in or for toothbrushes
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B2200/00Brushes characterized by their functions, uses or applications
    • A46B2200/10For human or animal care
    • A46B2200/1066Toothbrush for cleaning the teeth or dentures

Definitions

  • the present invention relates to a toothbrush, and more particularly to a toothbrush that can suppress damage to a user's oral cavity.
  • Patent Document 1 discloses a toothbrush in which a coating layer made of a soft resin covering 70% or more of the total surface area of the head portion and the neck portion is formed on the surface of a base made of hard resin. ing.
  • Patent Document 1 discloses that the total thickness of the head part and the neck part (the total thickness of the base and the coating layer covering the base) is 3 to 5 mm. It is disclosed that the thickness of the base constituting the neck portion is 2 to 4 mm, and the thickness of the coating layer is 0.5 to 2 mm (preferably 0.8 to 1.5 mm).
  • Patent Document 1 by adopting the above configuration, even when an excessive load is applied to the head portion or the neck portion, it becomes possible to make the handle body difficult to break, or the head portion or the neck portion is broken. Even in such a case, it is disclosed that it is possible to suppress the exposure of the broken portion by the coating layer.
  • the neck part of the toothbrush disclosed in Patent Document 1 is thinner than the base so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck part, and is a soft resin.
  • a covering layer (preferably a thickness of 0.8 to 1.5 mm) is provided.
  • the neck part of the toothbrush disclosed in Patent Document 1 is configured such that the ratio of the base made of hard resin is higher than that of soft resin.
  • the head part of the toothbrush disclosed in Patent Document 1 is, for example, when an external force is applied in the extending direction of the toothbrush (specifically, the direction from the rear end to the front end of the toothbrush). It was difficult to bend so that the external force transmitted to the tip of the head portion was sufficiently released so that the inside of the mouth was not damaged. Therefore, when a strong external force is applied in a direction from the rear end of the toothbrush to the tip in the state where the toothbrush disclosed in Patent Document 1 is held in the mouth, the user's oral cavity may be damaged. In particular, when the toothbrush user is an infant of 1 to 3 years, the risk of damage to the oral cavity increases.
  • This invention is made
  • a toothbrush includes a head portion having a flocked surface on a distal end side, and a handle portion that is disposed on a rear end side from the head portion and includes a handle portion main body. And a deformed portion that is disposed between the flocked surface and the handle portion and is deformed by an external force applied to the head portion, and a hard resin that is disposed from the head portion to a part of the distal end side of the handle portion. It includes a hard member that is formed, and a soft portion that is disposed on the rear end side from the deformable portion, accommodates at least a part of the hard member therein, and is formed of a soft resin.
  • the toothbrush according to one aspect of the present invention is characterized in that the toothbrush includes a second deforming portion that is disposed on the handle portion and is deformed by the external force.
  • the handle portion includes at least one ring-shaped depression portion with a reduced diameter with respect to the extending direction of the handle portion, and the second deformable portion. Is arranged at the position of the depression.
  • the said hard member is the 1st exposed part exposed to the said flocked surface side in the said head part, and the 2nd exposed part exposed to the opposite side to the said flocked surface. It is characterized by having.
  • the said hard member is a column-shaped 1st protrusion part which protrudes and exposes to the said flocking surface side in the said handle part, and the opposite side to the said flocking surface in the said handle part. And a columnar second protrusion that protrudes and is exposed.
  • the first protrusion is exposed through a first opening formed on the flocked surface side of the soft part
  • the second protrusion is It exposes through the 2nd opening part formed in the opposite side to the said flocked surface side of a soft part, It is characterized by the above-mentioned.
  • the soft portion of the handle portion has a tapered portion that tapers toward the distal end side, and the first opening and the second opening are It is formed in the taper part.
  • mode of the said invention WHEREIN has a parting line on the surface, and the said 1st protrusion part is one side of the direction orthogonal to the said flocked surface across the said parting line The second projecting portion is exposed to the other side in the orthogonal direction across the parting line.
  • the hard member is disposed so as to extend to the handle portion, and a distal end surface of the first protruding portion and a distal end surface of the second protruding portion are The handle portion is flush with the outer surface.
  • a portion of the hard member that is disposed on a rear end side of the handle portion with respect to the first protrusion and the second protrusion is formed on the handle portion.
  • the shape is such that the diameter becomes smaller toward the rear end side.
  • the head portion is composed of a first soft resin whose at least a tip portion is softer than the hard resin, and the handle portion main body is softer than the hard resin. 2 and the soft portion is made of the second soft resin.
  • the toothbrush which concerns on 1 aspect of the said invention WHEREIN:
  • variety in the 1st direction orthogonal to the said flocked surface has the said handle
  • the hard member in the head portion includes the flocked surface and a base member having a plurality of flocked holes
  • the first soft resin includes the flocked surface
  • the toothbrush which concerns on the one aspect
  • a neck portion whose width in the direction is equal to or less than the width of the head portion is arranged.
  • FIG. 5 is a cross-sectional view of the hard member shown in FIG. 4 in the AA line direction.
  • FIG. 5 is a cross-sectional view of the hard member (specifically, a first portion) shown in FIG. 4 in the BB line direction.
  • FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the CC line direction.
  • FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the DD line direction. It is sectional drawing which shows the manufacturing process of the toothbrush of this Embodiment, and is a figure for demonstrating the process of forming a hard member using a 1st metal mold
  • FIG. 1 is a side view of a toothbrush according to an embodiment of the present invention.
  • FIG. 2 is a front view of the toothbrush shown in FIG. In FIG. 2, for convenience of explanation, illustration of the brush portion 12 constituted by the plurality of hair bundles 12-1 shown in FIG. 1 is omitted.
  • FIG. 3 is a rear view of the toothbrush shown in FIG. 4 is an enlarged side view of the hard member shown in FIG.
  • FIG. 5 is an enlarged front view of the hard member shown in FIG. 6 is an enlarged rear view of the hard member shown in FIG.
  • FIGS. 1 to 6 indicate the extending direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used.
  • 2, 3, 5, and 6 indicate the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction).
  • the Z direction shown in FIGS. 1 and 4 indicates a first direction orthogonal to the flocked surface 21-1b when the toothbrush 10 is not used.
  • the reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also shown for convenience of explanation.
  • the toothbrush 10 of the present embodiment includes a handle body 11 and a brush portion 12.
  • the handle body 11 includes a head part 14, a neck part 15, a handle part 16, a head part 14, a neck part 15, and a hard member 17 constituting a part of the handle part 16.
  • the neck portion between the flocked surface 21-1b and the handle portion 16 has a width in the second direction (Y direction) smaller than the width of the head portion 14 (maximum width in the Y direction).
  • positioned is demonstrated.
  • the head unit 14 includes a base member 21 made of a hard resin and a first soft resin 22 that covers a part of the base member 21.
  • the base member 21 is a part of the constituent elements of the hard member 17 made of hard resin, and has a base member main body 21-1 and two support portions 21-2.
  • the base member body 21-1 reduces the outer shape of the head portion 14 by about 1 to 2 mm so that the first soft resin 22 can be disposed on the side surface and the bottom surface 21-1a of the base member body 21-1. The shape is different.
  • the base member main body 21-1 has a tip end portion 21-1A, a bottom surface 21-1a, a flocked surface 21-1b, and a flocked hole 21-1B.
  • the tip portion 21-1A is a portion of the base member main body 21-1 located on the side opposite to the side where the head portion 14 and the neck portion 15 are connected.
  • the distal end portion 21-1A is a portion facing the user's oral cavity when the user brushes his / her teeth using the toothbrush 10.
  • the shape of the tip portion 21-1a may be, for example, a rounded shape (round shape).
  • FIG. 7 is a cross-sectional view of the hard member shown in FIG. 4 in the AA line direction.
  • the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals.
  • reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also illustrated.
  • the bottom surface 21-1a is a portion covered with the first soft resin 22, and is disposed on the opposite side of the flocked surface 21-1b. ing.
  • the bottom surface 21-1a can be a flat surface, for example.
  • the flocked surface 21-1b is a flat surface.
  • the flocked surface 21-1b exposes a plurality of flocked holes 21-1B.
  • the flocked surface 21-1b is exposed from the first soft resin 22 as a first exposed portion of the head portion 14.
  • the base member main body 21-1 is configured using a hard resin harder than the first soft resin 22, and the plurality of flocked holes 21-1 B and the flocked surfaces 21-1 b are formed from the first soft resin 22.
  • the hair bundle 12-1 that constitutes the brush portion 12 can be implanted (planted) into the plurality of planting holes 21-1B by using the flat-line planting method.
  • the soft part 26, and the handle part main body 31 are resin-molded using the second mold 51 shown in FIG. -2 (refer to FIG. 12).
  • the flocked surface 21-1b comes into contact with the inner surface of one mold 51-2 constituting the second mold 51, the plurality of flocked holes 21-1B and the flocked surface 21-1b are in contact with the first.
  • the formation of the soft resin 22 can be suppressed.
  • a plurality of flocking holes 21-1B are provided in the base member body 21-1 on the side constituting the flocking surface 21-1b.
  • the flocking hole 21-1B is a hole into which the hair bundle 12-1 constituting the brush portion 12 is flocked.
  • the arrangement shown in FIG. 2 can be used as the arrangement of the plurality of flock holes 21-1B.
  • the arrangement is not limited to this, and any arrangement such as a so-called grid-like arrangement or a staggered arrangement may be used. It may be an array pattern.
  • the number of the flocking holes 21-1B is not limited to the number of flocking holes 21-1B shown in FIG. 2, and can be set as appropriate within a range of, for example, 10 to 60 holes. That is, the arrangement of the plurality of flocking holes 21-1B and the number of flocking holes 21-1B can be appropriately set according to the purpose.
  • the shape of the flocking hole 21-1B is not particularly limited, and for example, a perfect circle shape, a circular shape such as an ellipse, a polygonal shape such as a triangular shape or a quadrangular shape, or the like can be used. Further, the diameter of the flock hole 21-1B can be determined according to the thickness of the hair bundle 12-1, and can be appropriately set within a range of 1 to 3 mm, for example.
  • the thickness of the base member main body 21-1 in the Z direction is 5.0 mm
  • the thickness of the base member main body 21-1 in the Z direction is For example, it can be set to 4.2 mm.
  • the depth of the plurality of flocking holes 21-1B with respect to the flocking surface 21-1b can be set to, for example, 2.5 mm.
  • the thickness of the head portion 14 is a thickness measured at a central portion of the head portion 14 in the X direction.
  • the two support portions 21-2 are provided so as to protrude in the Z direction (downward in the case shown in FIG. 1) from the bottom surface 21-1a of the base member main body 21-1.
  • One of the two support portions 21-2 is disposed on the front end side of the base member main body 21-1, and the other is disposed on the rear end side of the base member main body 21-1.
  • the two support portions 21-2 are arranged to face each other in the X direction.
  • the two support portions 21-2 each have a protruding surface 21-2a that is a flat surface.
  • the two protruding surfaces 21-2 a are exposed from the outer surface of the first soft resin 22 and are flush with the outer surface of the first soft resin 22. That is, as shown in FIG. 3, the support portion 21-2 is exposed as the second exposed portion of the head portion 14 on the side opposite to the flocked surface 21-1b.
  • the protruding surface 21-2a is the first mold 41 (see FIG. 11). It is a part which contacts the inner surface of the. As described above, the protruding surface 21-2a is in contact with the inner surface of the first mold 41 (see FIG. 11), whereby the first soft resin 22 is formed around the two support portions 21-2 and the bottom surface 21-1a. Can be formed.
  • the protrusion amount of the two support portions 21-2 (in other words, the distance to the protrusion surface 21-2a with respect to the bottom surface 21-1a) is the first soft resin 22 arranged on the bottom surface 21-1a. Is equal to the thickness in the Z direction. Therefore, the protruding amounts of the two support portions 21-2 can be appropriately set according to the thickness of the first soft resin 22 disposed on the bottom surface 21-1a.
  • the protruding amount of the two support portions 21-2 is, for example, 0 .8 mm.
  • the thicknesses of the head portion 14 and the base member main body 21-1 are, for example, thicknesses measured at the center portion of the head portion 14 in the X direction.
  • the base member 21 configured as described above has a rear end integrally formed with a tip portion of the core portion 25 (one end of the core portion 25).
  • a resin harder than the first soft resin 22 is used.
  • a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa can be used.
  • Such a hard resin include, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS). And acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), and the like.
  • polybutylene terephthalate (PBT) is exemplified. preferable. Since polybutylene terephthalate (PBT) has a high bending strength, the base member 21 can be prevented from being broken or partially broken.
  • the said hard resin may be used individually by 1 type, and may be used in combination of 2 or more type as appropriate.
  • the first soft resin 22 has a side surface of the base member main body 21-1 and a side surface of the base member main body 21-1 in a state where the flocked surface 21-1b, the plurality of flocked holes 21-1B, and the end surfaces 21-2a of the two support portions 21-2 are exposed. It is provided so as to cover the bottom surface 21-1a. Thus, the first soft resin 22 is disposed so as to cover the tip portion 21-1A of the base member main body 21-1.
  • the user can place the toothbrush 10 at the tip portion 21-1A. Since the first soft resin 22 functions as a cushioning material, an external force is applied in the direction from the rear end side to the front end side of the toothbrush 10, and the first soft resin 22 disposed at the front end 21-1A is used. It is possible to prevent the user's oral cavity from being damaged when strongly pressed into the user's oral cavity.
  • the thickness of the first soft resin 22 disposed on the side surface and the bottom surface 21-1a of the base member main body 21-1 can be appropriately set within a range of 0.2 to 2.0 mm, for example, depending on the purpose. Although it is possible, it can be 0.8 mm, for example.
  • the case where the first soft resin 22 is provided so as to cover the side surface and the bottom surface 21-1a of the base member body 21-1 has been described as an example.
  • the soft resin 22 may be disposed so as to cover at least the tip portion 21-1A of the base member main body 21-1.
  • a soft resin having a hardness of JIS K 7215 Shore A of 90 or less may be used.
  • a soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, and polyester elastomers. Among them, styrene elastomers are preferable from the viewpoint of weldability with polypropylene (PP). .
  • Specific examples of the styrenic elastomer include, for example, Kuraray Co., Ltd. Septon (trade name), Riken Technos Co., Ltd. Rheostomer (trade name), and the like.
  • the first soft resin 22 may be appropriately selected according to the type of hard resin constituting the base member 21.
  • the first soft resin 22 is preferably, for example, a polyolefin-based elastomer or a styrene-based elastomer, and more preferably a styrene-based elastomer.
  • the length (the length in the X direction) of the head unit 14 having the above configuration is not particularly limited, and is preferably in the range of 10 to 30 mm, and more preferably in the range of 12 to 28 mm.
  • the length of the head portion 14 is 10 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 can be implanted.
  • the operativity of the toothbrush 10 in an intraoral area can be improved as the length of the head part 14 is 30 mm or less.
  • the width of the head portion 14 having the above configuration is not particularly limited, and is preferably in the range of 7 to 13 mm, and more preferably in the range of 8 to 12 mm.
  • the width of the head portion 14 is 7 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 is implanted.
  • the operativity of the toothbrush 10 in oral cavity can be improved as the width
  • the position of the boundary between the rear end of the head portion 14 and the tip of the neck portion 15 and the position of the boundary between the rear end of the neck portion 15 and the tip of the handle portion 16 are defined.
  • a portion where the width in the Y direction is the same as the maximum width of the head portion 14 or smaller than the maximum width of the head portion 14 between the flocked surface 21-1b and the handle portion 16 is included in the neck portion.
  • the width in the Y direction becomes narrower, the amount of change in the width increases, and the change in the width in the Y direction eventually.
  • the position where the amount is almost eliminated is defined as the boundary position between the rear end of the head portion 14 and the tip of the neck portion 15. Further, in the X direction from the front end of the neck portion 15 toward the rear end of the handle portion 16, the width in the Y direction becomes wider, the amount of change in the width increases, and eventually the amount of change in the width in the Y direction almost disappears. Is the position of the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16. In the present invention, the position of the rear end side of the handle portion 16 of the flock hole disposed at the position farthest from the front end of the head portion 14 in the X direction from the front end of the head portion 14 is defined as the rear end of the head portion 14.
  • the length of the neck portion 15 in the X direction can be appropriately set within a range of, for example, 20 to 60 mm.
  • the total length of the head portion and the neck portion is, for example, 40 It can be appropriately set within a range of ⁇ 85 mm.
  • the neck portion 15 is a portion that connects the head portion 14 and the handle portion 16.
  • the width of the neck portion 15 in the Y direction is configured to be narrower than the width of the head portion 14 and the handle portion 16.
  • the thickness of the neck portion 15 in the Z direction can be the same as the thickness of the head portion 14, for example.
  • the neck portion 15 includes a core portion 25 that is a component of the hard member 17 and a soft portion 26.
  • the core portion 25 extends in the X direction (extending direction of the neck portion 15), and extends through the neck portion 15, and extends in the X direction.
  • One end of the core portion 25 is the first portion. 25-1 and a second portion 25-2 disposed in a part of the handle portion 16 and integrated with the 25-1.
  • the first portion 25-1 constituting the neck portion 15 will be described, and the second portion 25-2 will be described when the configuration of the handle portion 16 is described.
  • FIG. 8 is a cross-sectional view of the hard member (specifically, the first portion) shown in FIG. 4 in the BB line direction.
  • the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals.
  • symbol of the component of the toothbrush 10 other than the component of the hard member 17 is also illustrated for convenience of explanation.
  • symbol of the neck part 15 is shown for convenience of explanation.
  • the first portion 25-1 has one end integrally formed with the rear end of the base member 21, and the other end is the second portion 25-2. It is configured integrally with.
  • the first portion 25-1 is made of a hard resin.
  • the first portion 25-1 has a hard resin (bending elastic modulus (JIS K7203)) in the range of 500 to 3000 MPa that is harder than the first soft resin 22 and the second soft resin 27 constituting the soft portion 26. A certain hard resin).
  • the first portion 25-1 has the same thickness in the X direction.
  • the neck part 15 is bent at the deformed part 15A shown in FIG. 2 (for example, near the center of the neck part 15) (in other words, the tip of the head part 14).
  • the thickness and shape of the first portion 25-1 and the thickness of the soft portion 26 disposed around the first portion 25-1 may be determined so as to release the force applied to the first portion 25-1.
  • the area of the cut surface of the neck portion 15 obtained by cutting the central portion in the X direction of the neck portion 15 with a plane orthogonal to the X direction (the cut surface 25 of the first portion 25-1).
  • -1a area S1 and the area S2 of the cut surface of the soft part 26 is 100%
  • the area S1 of the cut surface 25-1a of the first portion 25-1 is 5%.
  • the amount may be less than 50%, and preferably 27%, for example.
  • the shape of the first portion 25-1 when cut along a plane orthogonal to the X direction for example, a circular shape, an elliptical shape, a square shape, a rectangular shape, a diamond shape, a star shape, or the like can be used.
  • the corner of the first portion 25-1 is preferably rounded (round shape).
  • the neck portion 15 is in the Z direction (in other words, the direction in which a force is applied when pressing the tip of the brush portion 12 between the teeth or between teeth). It is preferable that the material is not easily deformed (in other words, the tip of the brush portion 12 can be firmly pressed against teeth or between teeth).
  • the first width W1 of the first portion 25-1 in the Z direction is in the Y direction (second direction) orthogonal to the Z direction. It may be larger than the second width W2 of the first portion.
  • the first width W1 is, for example, 1.5 mm to 3.0 mm
  • the second width W2 is, for example, 1.5 mm to 2.0 mm.
  • the cleaning performance of the toothbrush 10 is reduced by making the first width W1 of the first portion 25-1 in the Z direction larger than the second width W2 of the first portion in the Y direction.
  • the deformable portion 15A can be bent in the Y direction. Thereby, since it becomes possible to escape the force added to the front-end
  • the user of the toothbrush 10 when the user of the toothbrush 10 is an infant of 1 to 3 years old, it may run with the toothbrush 10 held in the mouth. In such a case, even if the infant falls, the infant It is possible to prevent the oral cavity from being damaged.
  • the first width W1 of the first portion 25-1 in the Z direction is larger than the second width W2 of the first portion in the Y direction.
  • the ellipse includes an ellipse in which two semicircles having the same radius are connected by two parallel tangents in addition to a curve formed from a set of points having a constant sum of distances from two focal points. .
  • the maximum value of the first width W1 may be configured to be larger than the maximum value of the second width W2.
  • the diameter R1 of the neck portion 15 is 3.95 mm
  • the first width W1 can be set to 1.975 mm, for example.
  • the second width W2 can be set to 1.7 mm, for example.
  • the soft part 26 is composed of a second soft resin 27 that houses the first part 25-1 and is softer than the hard resin that constitutes the core part 25.
  • the soft portion 26 is a member that prevents the first portion 25-1 from being exposed, and the deformed portion 15A of the neck portion 15 is bent when a strong force is applied to the tip of the head portion 14. It is a member for doing.
  • the second soft resin 27 for example, a soft resin having a hardness of 90 or less according to JIS K 6253 Shore A can be used.
  • the soft resin exemplified when explaining the first soft resin 22 can be used.
  • the second soft resin 27 may be made of a different kind of soft resin from the first soft resin 22 depending on the purpose.
  • the hardness of the soft resin used as the first soft resin 22 may be higher than the hardness of the soft resin used for the second soft resin 27.
  • tip of the head part 14 and the hardness of the neck part 15 can be varied.
  • the same kind of soft resin may be used as the first and second soft resins 22 and 27. Thereby, the number of types of soft resin used when manufacturing the toothbrush 10 can be reduced.
  • the outer shape of the cut surface of the soft portion 26 is circular has been described as an example, but the outer shape of the cut surface of the soft portion 26 is not limited thereto.
  • the outer shape of the cut surface of the soft portion 26 for example, a part of the long axis is the cut surface 25-
  • An elliptical shape coinciding with the major axis of 1a or the above-described oval shape may be used.
  • the diameter R1 of the neck portion 15 may be set to a value corresponding to the circumscribed circle of the cut surface 25-1a.
  • the handle portion 16 includes a second portion 25-2 (a part of the core portion 25) constituting the core portion 25, and a plurality of projecting portions 29 constituting the hard member 17.
  • the handle portion main body 31, the ring-shaped depressions 32-1, 32-2 (ring-shaped depressions), the first rib 34, the second rib 35, and the third rib 37 Have.
  • FIG. 9 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the CC line direction.
  • 10 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the DD line direction.
  • 9 and 10 the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals.
  • steering-wheel part 16 is shown for convenience of explanation.
  • 9 and 10 also illustrate reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the handle portion 16 for convenience of explanation.
  • the second portion 25-2 is made of a hard resin, and one end thereof is integrated with the first portion 25-1.
  • the hard resin constituting the second portion 25-2 for example, the same hard resin as that constituting the first portion 25-1 can be used.
  • the second portion 25-2 is similar to the X-direction in which the cross-sectional shape perpendicular to the X direction is continuously expanded from one end of the second portion 25-2 toward the plurality of columnar protrusions 29. It is configured as a shape. That is, the second portion 25-2 is configured such that the diameter of the portion provided with the plurality of protrusions 29 is the largest. Further, the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of projecting portions 29 increases from the plurality of projecting portions 29 toward the rear end side of the handle portion 16.
  • the cross-sectional shape orthogonal to the X direction is a similar shape whose diameter continuously decreases.
  • the shape of the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of protrusion portions 29 is changed from the plurality of protrusion portions 29 to the rear end side of the handle portion 16.
  • the same soft resin is used as the first and second soft resins 22 and 27, as shown in FIG.
  • the soft resin is introduced into the second mold 51 from the rear end side of the second mold 51 after the hard member 17 is disposed therein, the direction toward the front end of the head portion 14 (X direction) Since the soft resin easily moves (flows), the entire hard member 17 (except the flocked surface 21-1b and the plurality of flocked holes 21-1B) can be accurately wrapped with the soft resin.
  • the position and posture of the hard member 17 in the second mold 51 are changed by the introduced soft resin. Can be suppressed.
  • the second portion 25-2 is preferably provided at the tip of the handle portion 16, but is not limited thereto.
  • the second portion 25-2 may be provided in the neck portion 15.
  • protrusions 29 are provided as an example.
  • the four protruding portions 29 are arranged in the circumferential direction of the thickest portion of the second portion 25-2.
  • An angle formed by two projecting portions 29 arranged at adjacent positions can be set to 90 degrees, for example.
  • a space formed between two projecting portions 29 arranged at adjacent positions functions as a path for introducing a soft resin into a second mold 51 shown in FIG. 12 described later.
  • the soft resin is supplied to the distal end side of the head portion 21 through the space and is hardened (cured) to become the first soft resin 22.
  • Each of the plurality of protruding portions 29 has a protruding surface 29a.
  • the projecting surfaces 29a of the plurality of projecting portions 29 are exposed from the outer surface of the handle portion main body 31 (in other words, the outer surface of the handle portion 16) and face the outer surface of the handle portion main body 31 (the outer surface of the handle portion 16). It is comprised so that it may become one.
  • the protruding portion 29 as the first protruding portion located on the + Z side is located on the flocked surface 21-1b side through the opening 31a of the handle portion 31 (soft portion 26). Exposed to.
  • the protruding portion 29 as the second protruding portion located on the ⁇ Z side is exposed to the side opposite to the flocked surface 21-1b through the opening 31b of the handle portion 31 (soft portion 26).
  • the protruding portion 29 located on the + Y side is exposed to the + Y side via the opening 31c of the handle portion 31 (soft portion 26).
  • the protruding portion 29 located on the ⁇ Y side is exposed to the ⁇ Y side through the opening 31c of the handle portion 16 (soft portion 26).
  • the soft portion 26 in the handle portion 16 has a tapered portion 31A that tapers toward the distal end side, and the openings 31a to 31d are formed in the tapered portion 31A. Yes.
  • the protruding portion 29 is exposed to the outside through the openings 31a to 31d formed in the tapered portion 31A of the handle portion 16.
  • the cross-sectional shape of the outer surface of the handle portion 16 is substantially circular
  • the cross-sectional shape of the protruding surface 29a is an arc shape. Accordingly, each projecting surface 29a is exposed to the outside in the radial direction and exposed to the length direction of the toothbrush 10 and the direction orthogonal to the radial direction.
  • the protruding surface 29a of the protruding portion 29 as the first protruding portion located on the + Z side is exposed facing the + Z side and exposed facing the + Y side and the ⁇ Y side.
  • the projecting surface 29a of the projecting portion 29 as the second projecting portion located on the ⁇ Z side is exposed facing the ⁇ Z side, and exposed facing the + Y side and the ⁇ Y side. To do.
  • the plurality of projecting portions 29 are formed by using the second mold 51 (see FIG. 12) to dispose the hard member 17 in the space 53 of the second mold 51 and molding the handle body 31.
  • the protruding surface 29a comes into contact with the inner surface of the second mold 51, thereby having the function of maintaining the posture of the hard member 17 in the space together with the two support portions 21-12 constituting the base member 21 (details are given below) Will be described later).
  • the four projecting portions 29 have the projecting surfaces 29 a in contact with the inner surface of the second mold 51, so that the hard member 17 is viewed from four directions. Support the rear end.
  • the protrusion amount of the plurality of protrusions 29 is equal to the thickness of the second soft resin 27 disposed around the plurality of protrusions 29. Therefore, the protrusion amounts of the plurality of protrusions 29 are flush with the surface of the second soft resin 27 according to the desired thickness of the second soft resin 27 disposed around the plurality of protrusions 29.
  • the value can be set as appropriate. In FIG. 10, when the diameter R2 of the second portion 25-2 is 5.6 mm, the protruding amount T1 of the plurality of protruding portions 29 can be set to 1.77 mm, for example.
  • the number of the plurality of protrusions 29 is four. It is not limited to.
  • the number of the plurality of protrusions 29 may be, for example, three (in this case, the angle formed by the protrusions 29 arranged at adjacent positions is 120 degrees), or two or more 8 No more than two.
  • the shape of the plurality of protrusions 29 may be a shape having a flow path that allows the soft resin to flow from the rear end side of the plurality of protrusions 29 to the front end side of the base member 21.
  • the shape of the protrusion 29 shown in FIGS. 6 and 10 is not limited to a cylindrical shape.
  • the cross-sectional shape of the plurality of columnar protrusions 29 may be, for example, a star shape or a heart shape excellent in design.
  • the handle portion main body 31 is a portion that the user of the toothbrush 10 grips with a hand, and is constituted by the second soft resin 27.
  • the handle portion main body 31 by configuring the handle portion main body 31 with the second soft resin 27, a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the toothbrush 10 held in the mouth.
  • the handle portion body 31 can be deformed (specifically, bent).
  • the handle portion main body 31 is bent, so that it is possible to release an external force from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction. Damage to the oral cavity of 10 users can be suppressed.
  • the handle portion body 31 using the second soft resin 27, even when a strong force is applied to the handle portion body 31, the handle portion 16 is broken (in other words, the handle portion 16 Can be suppressed).
  • the ring-shaped depressions 32-1 and 32-2 are provided in an annular shape over the entire circumferential direction of the handle portion main body 31.
  • the ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16 with respect to the arrangement position of the second portion 25-2.
  • the ring-shaped depression 32-1 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-1 has a cross-sectional shape perpendicular to the X direction similar to that of the handle portion main body 31 and a shape in which the diameter continuously decreases.
  • the ring-shaped depression 32-2 is disposed, for example, 20 mm to 50 mm away from the position where the ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16.
  • the ring-shaped hollow portion 32-2 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-2 has a cross-sectional shape perpendicular to the X direction that is similar to that of the handle main body 31, and has a diameter that continuously decreases.
  • the toothbrush 10 is placed in the mouth.
  • the ring-shaped depressions 32-1 and 32-2 configured by reducing the diameter of the handle portion main body 31 in the X direction of the handle portion main body 31, the toothbrush 10 is placed in the mouth.
  • the ring-shaped depressions 32-1 and 32-2 as the second deformation portions are disposed at the positions where they are disposed.
  • the handle portion 16 can be easily bent. As a result, the external force applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 can be more efficiently released in a direction different from this, so that the oral cavity of the user of the toothbrush 10 is damaged. Can be further suppressed.
  • the user can use the toothbrush 10 by disposing the ring-shaped depressions 32-1 and 32-2 formed by reducing the diameter of the handle body 31 in the X direction of the handle body 31.
  • the operativity of the toothbrush 10 can be improved.
  • the case where two ring-shaped depressions 32-1 and 32-2 are provided in the handle body 31 has been described as an example, but the ring-shaped depressions 32-1 and 32-
  • the number of 2 is not limited to two.
  • One or more ring-shaped depressions 32-1 and 32-2 may be provided on the handle body 31 as needed.
  • the disposition positions of the ring-shaped depressions 32-1 and 32-2 may be disposed on the handle portion main body 31 located behind the disposition position of the second portion 25-2. 3 is not limited to the arrangement position of the ring-shaped depressions 32-1 and 32-2.
  • a plurality of the first rib portions 34 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-1.
  • a plurality of the second rib portions 35 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-2.
  • a plurality of third rib portions 37 are arranged on the side surface (in other words, two side surfaces) of the handle portion main body 31 located on the rear end side with respect to the arrangement position of the second rib portion 35.
  • the first to third rib portions 34, 35, and 37 can be composed of the second soft resin 27. In this case, the first to third rib portions 34, 35, and 37 can be collectively formed when the handle portion main body 31 is formed.
  • the first to third rib portions 34, 35, and 37 are not necessarily required.
  • the brush portion 12 includes a hair bundle 12-1 that is implanted in a plurality of hair implantation holes 21-1 B provided in the base member 21.
  • the hair bundle 12-1 is a bundle of a plurality of hairs.
  • the length (hair length) of the hair bundle 12-1 with respect to the flocked surface 21-1b can be determined in consideration of the waist and the like required for the hair bundle 12-1. Specifically, the length (hair length) of the hair bundle 12-1 can be appropriately set within a range of 6 to 13 mm, for example.
  • the hair bundle 12-1 may be composed of a plurality of hairs having the same length, or may be composed of a plurality of hairs having different hair lengths.
  • FIG. 1 as an example of the brush portion 12 constituting the toothbrush 10, a case where the tips of the plurality of hair bundles 12-1 constituting the brush portion 12 are aligned is illustrated as an example, but the present invention is not limited thereto.
  • the brush portion 12 may be provided with a step by making the lengths of the plurality of hair bundles 12-1 constituting the brush portion 12 different.
  • the thickness (hair bundle diameter) of the hair bundle 12-1 can be determined in consideration of the hair and the like required for the hair bundle 12-1, but can be appropriately set within a range of 1 to 2 mm, for example. it can. All the hair bundles 12-1 may have the same hair bundle diameter or may be different from each other.
  • a taper hair that is a hair whose diameter decreases toward the hair tip and the hair tip is sharpened, or a hair tip from the hair transplant surface 21-1b.
  • Straight hairs, etc. which are hairs whose diameters are substantially the same facing each other, can be used.
  • a hair whose tip is a plane substantially parallel to the flocked surface 21-1b, or one whose tip is rounded into a hemisphere can be used.
  • the material of the hair constituting the hair bundle 12-1 is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT).
  • polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT).
  • resin materials such as polyester such as polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN), and polyolefin such as PP.
  • the said resin material used as the material of hair may be used individually by 1 type, or may be used in combination of 2 or more type.
  • the hair constituting the hair bundle 12- for example, polyester hair having a multi-core structure having a core portion and at least one or more sheaths provided outside the core portion. May be used.
  • the cross-sectional shape of the hair constituting the hair bundle 12-1 is not particularly limited. For example, a round shape such as a true circle or an ellipse, a polygon, a star, a three-leaf clover shape, a four-leaf clover shape, or the like. Can be used.
  • the cross-sectional shapes of all the hairs constituting the brush portion 12 may be the same or different.
  • the thickness of the hair constituting the hair bundle 12-1 can be determined in consideration of the material of the hair.
  • the thickness of the hair can be, for example, 6 to 9 mil. 1 mil is 0.0254 mm.
  • the hair bundle 12-1 may be configured by arbitrarily combining a plurality of hairs having different thicknesses in consideration of a feeling of use, a feeling of cleaning, a cleaning effect, durability, and the like.
  • the tip portion is made of the first soft resin 22, the head portion 14 having the flocked surface 21-1b, and the handle portion main body 31 made of the second soft resin 27.
  • a neck portion 15 that connects the head portion 14 and the handle portion 16, the neck portion 15 extends in the extending direction (X direction) of the neck portion 15, and A core portion 25 made of a hard resin harder than one soft resin 22, and a soft portion 26 made of a second soft resin 27 that houses the core portion 25 and is softer than the hard resin.
  • Including the second soft resin 27 as a component when a strong external force is applied in a direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the user holding the toothbrush 10 in the mouth.
  • Neck 15 and handle Deformation of 16 makes it possible to release the force transmitted to the tip of the head portion 14, and the soft first soft resin 22 disposed at the tip of the head portion 14. Since it becomes possible to make it contact with a user's oral cavity, it can suppress that the user's oral cavity of the toothbrush 10 is damaged.
  • the user of the toothbrush 10 when the user of the toothbrush 10 is an infant of 1 to 3 years old, it may run with the toothbrush 10 held in the mouth. In such a case, even if the infant falls, the infant It is possible to prevent the oral cavity from being damaged.
  • toothbrush Q the case where the hard member 17 having the base member 21, the core portion 25, and the plurality of protruding portions 29 is used as a constituent element of the toothbrush 10 has been described as an example.
  • a toothbrush (hereinafter referred to as “toothbrush Q” for convenience of description) may be configured using a hard member (hereinafter referred to as “hard member P” for convenience of description) in which 21 is excluded from the constituent elements. The same effect as the toothbrush 10 of this Embodiment can be acquired.
  • the hard member P may be configured not only to have a plurality of protruding portions 29 only on the rear end side of the core portion 25 but also to have a plurality of protruding portions 29 also on the front end side of the core portion 25.
  • a soft resin resin that becomes the first and second soft resins 22 and 27
  • a mold not shown
  • the toothbrush Q can be manufactured with high accuracy.
  • an in-mold method may be used.
  • FIG. 11 is a cross-sectional view showing a manufacturing process of the toothbrush of the present embodiment, and is a diagram for explaining a process of forming a hard member using a first mold.
  • FIG. 12 is a cross-sectional view illustrating a manufacturing process of the toothbrush of the present embodiment, and illustrates a process of forming the first soft resin, the soft part, and the handle part main body using the second mold.
  • FIG. 11 and 12 the same components as those shown in FIGS. 1 to 10 are denoted by the same reference numerals.
  • the arrow shown in FIG. 11 has shown the direction in which hard resin is introduced
  • the arrow shown in FIG. 12 has shown the direction in which soft resin (soft resin N mentioned later) is introduced.
  • a space 43 corresponding to the shape of the hard member 17 and an introduction for introducing a hard resin into the space 43 are formed by a pair of molds 41-1 and 41-2.
  • a first mold 41 having a mouth 45 is prepared.
  • the mold 41-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B.
  • the introduction port 45 is disposed on the rear end side of the space 43.
  • the space 43 is filled with a molten hard resin (a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa) serving as a base material of the hard member 17 through the introduction port 45.
  • a molten hard resin a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa
  • JIS K7203 flexural modulus
  • the hard member 17 is formed in which the base member 21 including the plurality of flock holes 21-1B and the support portion 21-2, the core portion 25, and the plurality of protrusions 29 are integrated. Thereafter, the hard member 17 is taken out from the first mold 41.
  • a second mold 55 having an introduction port 55 for introducing is prepared.
  • the joint surfaces of the pair of molds 51-1 and 51-2 are set at an intermediate position in the Z direction of the soft portion 26 (handle portion main body 31) shown in FIGS. 8 to 10, for example.
  • the mold 51-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B.
  • the introduction port 55 is disposed on the rear end side of the space 53.
  • the second mold 51 is formed with the ring-shaped depressions 32-1 and 32-2, the first rib 34, the second rib 35, and the third rib 37 shown in FIG. Protrusions are provided for doing so.
  • the hard member 17 is disposed at the tip of the space 53 of the second mold 51.
  • the inner surface of the mold 51-2 and the flocked surface 21-1b are brought into contact with each other so that the plurality of flocked holes 21-1B are covered, and the end surfaces of the two support portions 21-2 and the mold 51-1.
  • the plurality of (in the case of this embodiment, four) projecting surfaces 29a of the projecting portions 29 and the inner surface of the second mold 51 are brought into contact with each other.
  • the soft resin N used as the 1st soft resin 22 and the 2nd soft resin 27 (the soft resin which comprises the soft part 26 and the handle
  • the position and posture of the hard member 17 in the second mold 51 can be maintained.
  • the protruding surface 29a of the protruding portion 29 located on the + Z side contacts the inner surface of the mold 51-2, and the protruding surface 29a of the protruding portion 29 positioned on the ⁇ Z side contacts the inner surface of the mold 51-1.
  • the hard member 17 is positioned in the Z direction.
  • both the protruding portion 29 positioned on the + Z side and the protruding surface 29a of the protruding portion 29 positioned on the ⁇ Z side face the + Y side and the ⁇ Y side, the mold 51-1 and the mold 51 -2 is also positioned in the Y direction by contacting the inner surface.
  • the end surfaces of the two supporting portions 21-2 and the protruding surfaces 29 a of the plurality of protruding portions 29 come into contact with the inner surface of the second mold 51, so that the space between the hard member 17 and the second mold 51 is reduced.
  • a gap for forming the first soft resin 22 and the soft portion 26 can be secured.
  • the melted soft resin N (resin having a hardness of JIS K 7215 Shore A of 90 or less) is filled into the space 53 through the introduction port 55. Since the inner surfaces of the mold 51-1 and the mold 51-2 at the position corresponding to the tapered portion 31A are shortened so as to taper toward the front end side, the projecting surface 29a is in contact with the inner surface. Thus, the hard member 17 is prevented from moving toward the tip side. Therefore, the hard member 17 is positioned without moving in the X direction even when the resin pressure of the molten soft resin N filled through the introduction port 55 is applied. Thereafter, the first soft resin 22, the soft portion 26, and the handle portion main body 31 are formed by curing the soft resin N.
  • Parting lines of minute protrusions are formed on the surface of the soft portion 26 at a position facing the joint surfaces of the mold 51-1 and the mold 51-2 (substantially intermediate position in the Z direction). As a result, the handle body 11 having the head portion 14, the neck portion 15, and the handle portion 16 is formed. Thereafter, the handle body 11 is taken out from the second mold 51.
  • the hair bundle 12-1 is implanted into the plurality of flocking holes 21-2 of the head portion 11.
  • the toothbrush 10 of this embodiment shown in FIG. 1 is manufactured.
  • a flat wire a thin plate made of metal (for example, brass)
  • the flat wire flocking method of planting the hair bundle 12-1 with the flat wire sandwiched in the flock hole 21-2 can be used.
  • the case of using the flat wire flocking method has been described as an example of the flocking method of the hair bundle 12-1.
  • the resin constituting the head unit 14 is used. After the lower end of the hair bundle 12-1 is pressed and fixed into (soft resin or hard resin), or after the lower end of the hair bundle 12-1 is heated to form a molten mass, An in-mold method or the like in which a molten resin is introduced into the substrate may be used.
  • the configuration in which the soft portion 26 is provided at the tip portion of the head portion 14 is illustrated, but is not limited thereto, as shown in the side view of FIG. 13 and the front view of FIG.
  • a configuration in which the deformable portion 15A in the neck portion 15 is included and the soft portion 26 is provided on the rear end side from the deformable portion 15A may be employed.
  • the present invention can be widely applied to a so-called one-tuft toothbrush having a single hair bundle, a toothbrush having a tongue coating auxiliary removing portion, and the like.
  • the width in the second direction is smaller than the width of the head portion 14 (maximum width in the Y direction) between the flocked surface 21-1b and the handle portion 16.
  • the toothbrush 10 in which the neck portion 15 is disposed has been described, the present invention is not limited to this configuration.
  • the width in the Y direction between the flocked surface 21-1b and the handle portion 16 is A toothbrush in the case where the same portion as the maximum width exists is also included in the present invention.
  • the deformed portion is disposed as the neck portion, and at least a part of the hard member is accommodated in the rear end side from the deformed portion, and the soft portion formed of the soft resin is disposed. Is done.
  • the present invention can be used for a toothbrush capable of suppressing damage to a user's oral cavity.
  • Projection surface 31 ... Handle body, 31A ... Taper, 32-1, 32-2 ... Ring-shaped depression (second deformation part), 34 ... First rib, 35 ... 2nd rib part, 37 ... 3rd rib part, 41 ... 1st metal mold

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Abstract

The purpose of the present invention is to provide a toothbrush capable of suppressing damage to the oral cavity of a user. The toothbrush includes: a head part (14) having a bristle implanting face (21-1b) on the front end side thereof; and a handle part (16) disposed on the rear end side from the head part and including a handle part body (31), the toothbrush comprising: a deformable part (15A) disposed between the bristle implanting face and the handle part and deformed by an external force applied to the head part; a hard member (17) extending from the head part to a portion of the front end side of the handle part and formed of a hard resin; and a soft part (26) disposed on the rear end side from the deformable part, accommodating at least a portion of the hard member therein, and formed of a soft resin.

Description

歯ブラシtoothbrush
 本発明は、歯ブラシに関し、特に、使用者の口腔の損傷を抑制可能な歯ブラシに関する。
 本願は、2014年9月1日に、日本に出願された特願2014-177334号に基づき優先権を主張し、その内容をここに援用する。
The present invention relates to a toothbrush, and more particularly to a toothbrush that can suppress damage to a user's oral cavity.
This application claims priority based on Japanese Patent Application No. 2014-177334 filed in Japan on September 1, 2014, the contents of which are incorporated herein by reference.
 従来、歯ブラシを使用時(具体的には、歯ブラシを口にくわえた状態の時)の転倒により口腔外傷を負う場合があり、特に、歯ブラシの使用者が1~3才の乳幼児である場合に、口腔外傷を負うケースが多い。 Conventionally, when a toothbrush is used (specifically, when the toothbrush is held in the mouth), it may cause an oral trauma, especially when the toothbrush user is an infant of 1 to 3 years old Many cases suffer from oral trauma.
 従来、ヘッド部及びネック部の欠損や折れを抑制可能な歯ブラシとして、特許文献1に開示された歯ブラシがある。
 特許文献1には、硬質樹脂で構成された基台の表面に、ヘッド部の表面積とネック部の表面積との合計の70%以上を覆う軟質樹脂からなる被覆層が形成された歯ブラシが開示されている。
Conventionally, there is a toothbrush disclosed in Patent Document 1 as a toothbrush that can suppress a head portion and a neck portion from being broken or broken.
Patent Document 1 discloses a toothbrush in which a coating layer made of a soft resin covering 70% or more of the total surface area of the head portion and the neck portion is formed on the surface of a base made of hard resin. ing.
 また、特許文献1には、ヘッド部及びネック部の全体の厚さ(基台の厚さと該基台を被覆する被覆層の厚さとを合計した厚さ)を3~5mmとし、ヘッド部及びネック部を構成する基台の厚さを2~4mmとし、被覆層の厚さを0.5~2mm(好ましくは、0.8~1.5mm)とすることが開示されている。 Patent Document 1 discloses that the total thickness of the head part and the neck part (the total thickness of the base and the coating layer covering the base) is 3 to 5 mm. It is disclosed that the thickness of the base constituting the neck portion is 2 to 4 mm, and the thickness of the coating layer is 0.5 to 2 mm (preferably 0.8 to 1.5 mm).
 特許文献1には、上記構成とすることで、ヘッド部やネック部に過度な負荷が加えられた場合でも、ハンドル体を折れにくくすることが可能となることや、ヘッド部又はネック部が折れた場合でも、被覆層により折れた部分が露出することを抑制可能なことが開示されている。 In Patent Document 1, by adopting the above configuration, even when an excessive load is applied to the head portion or the neck portion, it becomes possible to make the handle body difficult to break, or the head portion or the neck portion is broken. Even in such a case, it is disclosed that it is possible to suppress the exposure of the broken portion by the coating layer.
 上記構成とされた特許文献1に開示された歯ブラシは、ヘッド部の先端部を構成する基台が軟質樹脂で覆われているため、強く噛んだり、口腔内にヘッド部の先端が強く当たったりした際、上記軟質樹脂がクッション材として機能する。
 このため、特許文献1に開示された歯ブラシを使用することで、ヘッドの先端部に起因する口腔内の損傷を抑制することが可能となる。
In the toothbrush disclosed in Patent Document 1 having the above-described configuration, since the base constituting the distal end portion of the head portion is covered with a soft resin, the toothbrush is strongly bitten, or the distal end of the head portion hits the oral cavity strongly. When this is done, the soft resin functions as a cushioning material.
For this reason, by using the toothbrush disclosed in Patent Document 1, it is possible to suppress damage in the oral cavity caused by the tip of the head.
特開2013-458号公報JP 2013-458 A
 しかしながら、特許文献1に開示された歯ブラシのネック部は、該ネック部を構成する基台(厚さ2~4mm)の表面を覆うように、該基台よりも厚さが薄く、かつ軟質樹脂よりなる被覆層(好ましい厚さが0.8~1.5mm)が設けられている。
 このため、特許文献1に開示された歯ブラシのネック部は、軟質樹脂よりも硬質樹脂よりなる基台の割合の方が高くなるような構成とされている。
However, the neck part of the toothbrush disclosed in Patent Document 1 is thinner than the base so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck part, and is a soft resin. A covering layer (preferably a thickness of 0.8 to 1.5 mm) is provided.
For this reason, the neck part of the toothbrush disclosed in Patent Document 1 is configured such that the ratio of the base made of hard resin is higher than that of soft resin.
 このため、特許文献1に開示された歯ブラシのヘッド部は、例えば、該歯ブラシの延在方向(具体的には、歯ブラシの後端から先端に向かう方向)に外力が加えられた際、使用者の口腔内が損傷しないように、ヘッド部の先端に伝わる外力を十分逃がすように、曲がることが困難であった(但し、全て硬質樹脂で構成した場合よりは曲がりやすい。)。
 したがって、特許文献1に開示された歯ブラシを口にくわえた状態で、歯ブラシの後端から先端に向かう方向に強い外力が加わると、使用者の口腔内が損傷してしまう恐れがあった。
 特に、歯ブラシの使用者が1~3才の乳幼児である場合、口腔内が損傷するリスクが高まる。
For this reason, the head part of the toothbrush disclosed in Patent Document 1 is, for example, when an external force is applied in the extending direction of the toothbrush (specifically, the direction from the rear end to the front end of the toothbrush). It was difficult to bend so that the external force transmitted to the tip of the head portion was sufficiently released so that the inside of the mouth was not damaged.
Therefore, when a strong external force is applied in a direction from the rear end of the toothbrush to the tip in the state where the toothbrush disclosed in Patent Document 1 is held in the mouth, the user's oral cavity may be damaged.
In particular, when the toothbrush user is an infant of 1 to 3 years, the risk of damage to the oral cavity increases.
 本発明は上記問題に鑑みてなされたものであり、使用者の口腔内の損傷を抑制することの可能な歯ブラシを提供することを目的とする。 This invention is made | formed in view of the said problem, and it aims at providing the toothbrush which can suppress damage in a user's oral cavity.
 上記課題を解決するため、本発明の一態様に係る歯ブラシは、先端側に植毛面を有するヘッド部と、前記ヘッド部より後端側に配置され、ハンドル部本体を含むハンドル部と、を有し、前記植毛面と前記ハンドル部との間に配置され、前記ヘッド部への外力で変形する変形部と、前記ヘッド部から前記ハンドル部の先端側の一部に亘って配置され硬質樹脂で形成された硬質部材と、前記変形部から後端側に配置され前記硬質部材の少なくとも一部を内部に収容し、且つ、軟質樹脂で形成された軟質部と、を含むことを特徴とする。 In order to solve the above problems, a toothbrush according to an aspect of the present invention includes a head portion having a flocked surface on a distal end side, and a handle portion that is disposed on a rear end side from the head portion and includes a handle portion main body. And a deformed portion that is disposed between the flocked surface and the handle portion and is deformed by an external force applied to the head portion, and a hard resin that is disposed from the head portion to a part of the distal end side of the handle portion. It includes a hard member that is formed, and a soft portion that is disposed on the rear end side from the deformable portion, accommodates at least a part of the hard member therein, and is formed of a soft resin.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記ハンドル部に配置され、前記外力で変形する第2変形部を有することを特徴とする。 The toothbrush according to one aspect of the present invention is characterized in that the toothbrush includes a second deforming portion that is disposed on the handle portion and is deformed by the external force.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記ハンドル部は、該ハンドル部の延在方向に対して、少なくとも1つの縮径されたリング状の窪み部を有し、前記第2変形部は、前記窪み部の配設位置に配置されることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, the handle portion includes at least one ring-shaped depression portion with a reduced diameter with respect to the extending direction of the handle portion, and the second deformable portion. Is arranged at the position of the depression.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記硬質部材は、前記ヘッド部において前記植毛面側に露出する第1露出部と、前記植毛面とは逆側に露出する第2露出部とを有することを特徴とする。 Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: The said hard member is the 1st exposed part exposed to the said flocked surface side in the said head part, and the 2nd exposed part exposed to the opposite side to the said flocked surface. It is characterized by having.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記硬質部材は、前記ハンドル部において前記植毛面側に突出して露出する柱状の第1突出部と、前記ハンドル部において前記植毛面とは逆側に突出して露出する柱状の第2突出部とを有することを特徴とする。 Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: The said hard member is a column-shaped 1st protrusion part which protrudes and exposes to the said flocking surface side in the said handle part, and the opposite side to the said flocking surface in the said handle part. And a columnar second protrusion that protrudes and is exposed.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記第1突出部は、前記軟質部の前記植毛面側に形成された第1開口部を介して露出し、前記第2突出部は、前記軟質部の前記植毛面側とは逆側に形成された第2開口部を介して露出することを特徴とする。 In the toothbrush according to the aspect of the present invention, the first protrusion is exposed through a first opening formed on the flocked surface side of the soft part, and the second protrusion is It exposes through the 2nd opening part formed in the opposite side to the said flocked surface side of a soft part, It is characterized by the above-mentioned.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記ハンドル部における前記軟質部は、前記先端側に向けて先細る先細り部を有し、前記第1開口部および前記第2開口部は、前記先細り部に形成されていることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, the soft portion of the handle portion has a tapered portion that tapers toward the distal end side, and the first opening and the second opening are It is formed in the taper part.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記軟質部は、表面にパーティングラインを有し、前記第1突出部は、前記パーティングラインを挟んで前記植毛面と直交する方向の一方側に露出し、前記第2突出部は、前記パーティングラインを挟んで前記直交する方向の他方側に露出することを特徴とする。 Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: The said soft part has a parting line on the surface, and the said 1st protrusion part is one side of the direction orthogonal to the said flocked surface across the said parting line The second projecting portion is exposed to the other side in the orthogonal direction across the parting line.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記硬質部材は、前記ハンドル部まで延在するように配置されており、前記第1突出部の先端面および前記第2突出部の先端面は、前記ハンドル部の外面に対して面一であることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, the hard member is disposed so as to extend to the handle portion, and a distal end surface of the first protruding portion and a distal end surface of the second protruding portion are The handle portion is flush with the outer surface.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記硬質部材のうち、前記第1突出部および前記第2突出部よりも前記ハンドル部の後端側に配置された部分は、前記ハンドル部の後端側に向かうにつれて、径が小さくなる形状であることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, a portion of the hard member that is disposed on a rear end side of the handle portion with respect to the first protrusion and the second protrusion is formed on the handle portion. The shape is such that the diameter becomes smaller toward the rear end side.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記ヘッド部は、少なくとも先端部が前記硬質樹脂よりも軟らかい第1の軟質樹脂で構成され、前記ハンドル部本体は、前記硬質樹脂よりも軟らかい第2の軟質樹脂で構成され、前記軟質部は、前記第2の軟質樹脂で構成されることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, the head portion is composed of a first soft resin whose at least a tip portion is softer than the hard resin, and the handle portion main body is softer than the hard resin. 2 and the soft portion is made of the second soft resin.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記植毛面と前記ハンドル部との間における前記硬質部材は、前記植毛面に対して直交する第1の方向における第1の幅が、前記ハンドル部の長さ方向と前記第1の方向とに対して直交する第2の方向における第2の幅よりも大きいことを特徴とする。 Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: As for the said hard member between the said flocked surface and the said handle part, the 1st width | variety in the 1st direction orthogonal to the said flocked surface has the said handle | steering_wheel. It is characterized by being larger than the second width in the second direction orthogonal to the length direction of the part and the first direction.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記ヘッド部における前記硬質部材は、前記植毛面、及び複数の植毛穴を有するベース部材を含み、前記第1の軟質樹脂は、前記植毛面、及び前記複数の植毛穴を露出させた状態で、前記ベース部材の一部を覆うように配置されることを特徴とする。 Further, in the toothbrush according to the aspect of the present invention, the hard member in the head portion includes the flocked surface and a base member having a plurality of flocked holes, and the first soft resin includes the flocked surface, And it arrange | positions so that a part of said base member may be covered in the state which exposed the said plurality of flock holes.
 また、上記本発明の一態様に係る歯ブラシにおいて、前記植毛面と前記ハンドル部との間に、前記植毛面と直交する第1の方向と前記ハンドル部の長さ方向とに直交する第2の方向の幅が、前記ヘッド部の幅以下のネック部が配置されることを特徴とする。 Moreover, in the toothbrush which concerns on the one aspect | mode of the said invention, between the said flocked surface and the said handle part, it is 2nd orthogonal to the 1st direction orthogonal to the said flocked surface, and the length direction of the said handle part. A neck portion whose width in the direction is equal to or less than the width of the head portion is arranged.
 本発明の歯ブラシによれば、使用者の口腔の損傷を抑制することができる。 According to the toothbrush of the present invention, damage to the user's oral cavity can be suppressed.
本発明の実施の形態に係る歯ブラシの側面図である。It is a side view of the toothbrush which concerns on embodiment of this invention. 図1に示す歯ブラシの正面図である。It is a front view of the toothbrush shown in FIG. 図1に示す歯ブラシを背面図である。It is a rear view of the toothbrush shown in FIG. 図1に示す硬質部材を拡大した側面図である。It is the side view to which the hard member shown in FIG. 1 was expanded. 図2に示す硬質部材を拡大した正面図である。It is the front view which expanded the hard member shown in FIG. 図3に示す硬質部材を拡大した背面図である。It is the rear view which expanded the hard member shown in FIG. 図4に示す硬質部材のA-A線方向の断面図である。FIG. 5 is a cross-sectional view of the hard member shown in FIG. 4 in the AA line direction. 図4に示す硬質部材(具体的には、第1の部分)のB-B線方向の断面図である。FIG. 5 is a cross-sectional view of the hard member (specifically, a first portion) shown in FIG. 4 in the BB line direction. 図4に示す硬質部材(具体的には、第2の部分)のC-C線方向の断面図である。FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the CC line direction. 図4に示す硬質部材(具体的には、第2の部分)のD-D線方向の断面図である。FIG. 5 is a cross-sectional view of the hard member (specifically, a second portion) shown in FIG. 4 in the DD line direction. 本実施の形態の歯ブラシの製造工程を示す断面図であり、第1の金型を用いて硬質部材を形成する工程を説明するための図である。It is sectional drawing which shows the manufacturing process of the toothbrush of this Embodiment, and is a figure for demonstrating the process of forming a hard member using a 1st metal mold | die. 本実施の形態の歯ブラシの製造工程を示す断面図であり、第2の金型を用いて、第1の軟質樹脂、軟質部、及びハンドル部本体を形成する工程を説明するための図である。It is sectional drawing which shows the manufacturing process of the toothbrush of this Embodiment, and is a figure for demonstrating the process of forming 1st soft resin, a soft part, and a handle | steering-wheel main body using a 2nd metal mold | die. . 本発明の実施の形態に係る歯ブラシの変形例を示す側面図である。It is a side view which shows the modification of the toothbrush which concerns on embodiment of this invention. 図13に示す歯ブラシの正面図である。It is a front view of the toothbrush shown in FIG.
 以下、図面を参照して本発明を適用した実施の形態について詳細に説明する。なお、以下の説明で用いる図面は、本発明の実施形態の構成を説明するためのものであり、図示される各部の大きさや厚さや寸法等は、実際の歯ブラシの寸法関係とは異なる場合がある。 Hereinafter, an embodiment to which the present invention is applied will be described in detail with reference to the drawings. Note that the drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimensions, etc. of each part shown in the drawings may be different from the actual dimensional relationship of the toothbrush. is there.
 (実施の形態)
 図1は、本発明の実施の形態に係る歯ブラシの側面図である。図2は、図1に示す歯ブラシの正面図である。図2では、説明の便宜上、図1に示す複数の毛束12-1で構成されたブラシ部12の図示を省略する。図3は、図1に示す歯ブラシを背面図である。
 図4は、図1に示す硬質部材を拡大した側面図である。図5は、図2に示す硬質部材を拡大した正面図である。図6は、図3に示す硬質部材を拡大した背面図である。
(Embodiment)
FIG. 1 is a side view of a toothbrush according to an embodiment of the present invention. FIG. 2 is a front view of the toothbrush shown in FIG. In FIG. 2, for convenience of explanation, illustration of the brush portion 12 constituted by the plurality of hair bundles 12-1 shown in FIG. 1 is omitted. FIG. 3 is a rear view of the toothbrush shown in FIG.
4 is an enlarged side view of the hard member shown in FIG. FIG. 5 is an enlarged front view of the hard member shown in FIG. 6 is an enlarged rear view of the hard member shown in FIG.
 図1~図6に示す構造体において、同一構成部分には、同一符号を付す。図1~図6に示すX方向は、歯ブラシ10を使用していない状態におけるハンドル体11の延在方向(ネック部15の延在方向)を示している。
 図2、図3、図5、及び図6に示すY方向は、歯ブラシ10の幅方向(言い換えれば、Z方向およびX方向に対して直交する第2の方向)を示している。
 図1及び図4に示すZ方向は、歯ブラシ10を使用していない状態において、植毛面21-1bに対して直交する第1の方向を示している。
 また、図4~図6では、説明の便宜上、硬質部材17の構成要素以外の歯ブラシ10の構成要素の符号も図示する。
In the structure shown in FIGS. 1 to 6, the same components are denoted by the same reference numerals. 1 to 6 indicate the extending direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used.
2, 3, 5, and 6 indicate the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction).
The Z direction shown in FIGS. 1 and 4 indicates a first direction orthogonal to the flocked surface 21-1b when the toothbrush 10 is not used.
4 to 6, the reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also shown for convenience of explanation.
 図1~図6を参照するに、本実施の形態の歯ブラシ10は、ハンドル体11と、ブラシ部12と、を有する。
 ハンドル体11は、ヘッド部14と、ネック部15と、ハンドル部16と、ヘッド部14、ネック部15、及びハンドル部16の一部を構成する硬質部材17と、を有する。
 本実施の形態では、植毛面21-1bとハンドル部16との間に、上記第2の方向(Y方向)の幅が、ヘッド部14の幅(Y方向の最大幅)よりも小さいネック部15が配置される歯ブラシ10について説明する。
1 to 6, the toothbrush 10 of the present embodiment includes a handle body 11 and a brush portion 12.
The handle body 11 includes a head part 14, a neck part 15, a handle part 16, a head part 14, a neck part 15, and a hard member 17 constituting a part of the handle part 16.
In the present embodiment, the neck portion between the flocked surface 21-1b and the handle portion 16 has a width in the second direction (Y direction) smaller than the width of the head portion 14 (maximum width in the Y direction). The toothbrush 10 in which 15 is arrange | positioned is demonstrated.
 ヘッド部14は、硬質樹脂で構成されたベース部材21と、ベース部材21の一部を覆う第1の軟質樹脂22と、を有する。ベース部材21は、硬質樹脂で構成された硬質部材17の構成要素の一部であり、ベース部材本体21-1と、2つの支持部21-2と、を有する。
 ベース部材本体21-1は、ベース部材本体21-1の側面及び底面21-1aに第1の軟質樹脂22を配置することが可能なように、ヘッド部14の外形を1~2mm程度縮小させた形状とされている。ベース部材本体21-1は、先端部21-1Aと、底面21-1aと、植毛面21-1bと、植毛穴21-1Bと、を有する。
The head unit 14 includes a base member 21 made of a hard resin and a first soft resin 22 that covers a part of the base member 21. The base member 21 is a part of the constituent elements of the hard member 17 made of hard resin, and has a base member main body 21-1 and two support portions 21-2.
The base member body 21-1 reduces the outer shape of the head portion 14 by about 1 to 2 mm so that the first soft resin 22 can be disposed on the side surface and the bottom surface 21-1a of the base member body 21-1. The shape is different. The base member main body 21-1 has a tip end portion 21-1A, a bottom surface 21-1a, a flocked surface 21-1b, and a flocked hole 21-1B.
 先端部21-1Aは、ベース部材本体21-1のうち、ヘッド部14とネック部15とが接続される側とは反対側に位置する部分である。先端部21-1Aは、使用者が歯ブラシ10を使用して歯磨きをする際、使用者の口腔内と対向する部分である。先端部21-1aの形状は、例えば、丸みを帯びた形状(ラウンド形状)にするとよい。 The tip portion 21-1A is a portion of the base member main body 21-1 located on the side opposite to the side where the head portion 14 and the neck portion 15 are connected. The distal end portion 21-1A is a portion facing the user's oral cavity when the user brushes his / her teeth using the toothbrush 10. The shape of the tip portion 21-1a may be, for example, a rounded shape (round shape).
 図7は、図4に示す硬質部材のA-A線方向の断面図である。図7において、図1~図6に示す構造体と同一構成部分には、同一符号を付す。また、図7では、説明の便宜上、硬質部材17の構成要素以外の歯ブラシ10の構成要素の符号も図示する。 FIG. 7 is a cross-sectional view of the hard member shown in FIG. 4 in the AA line direction. In FIG. 7, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals. Further, in FIG. 7, for convenience of explanation, reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the hard member 17 are also illustrated.
 図1、図3、図4、図6、及び図7を参照するに、底面21-1aは、第1の軟質樹脂22で覆われる部分であり、植毛面21-1bの反対側に配置されている。底面21-1aは、例えば、平坦な面とすることができる。 Referring to FIG. 1, FIG. 3, FIG. 4, FIG. 6, and FIG. 7, the bottom surface 21-1a is a portion covered with the first soft resin 22, and is disposed on the opposite side of the flocked surface 21-1b. ing. The bottom surface 21-1a can be a flat surface, for example.
 植毛面21-1bは、平坦な面とされている。植毛面21-1bは、複数の植毛穴21-1Bを露出している。植毛面21-1bは、ヘッド部14における第1露出部として、第1の軟質樹脂22から露出されている。
 このように、第1の軟質樹脂22よりも硬い硬質樹脂を用いてベース部材本体21-1を構成すると共に、複数の植毛穴21-1B及び植毛面21-1bを第1の軟質樹脂22から露出させることで、複数の植毛穴21-1Bに対して、平線植毛法を用いて、ブラシ部12を構成する毛束12-1を植毛(植設)することができる。
The flocked surface 21-1b is a flat surface. The flocked surface 21-1b exposes a plurality of flocked holes 21-1B. The flocked surface 21-1b is exposed from the first soft resin 22 as a first exposed portion of the head portion 14.
In this way, the base member main body 21-1 is configured using a hard resin harder than the first soft resin 22, and the plurality of flocked holes 21-1 B and the flocked surfaces 21-1 b are formed from the first soft resin 22. By exposing, the hair bundle 12-1 that constitutes the brush portion 12 can be implanted (planted) into the plurality of planting holes 21-1B by using the flat-line planting method.
 植毛面21-1bは、後述する図12に示す第2の金型51を用いて、第1の軟質樹脂22、軟質部26、及びハンドル部本体31を樹脂成型する際、一方の金型51-2(図12参照)の内面と接触する面である。
 このように、植毛面21-1bが第2の金型51を構成する一方の金型51-2の内面と接触することで、複数の植毛穴21-1B及び植毛面21-1bに第1の軟質樹脂22が形成されることを抑制できる。
When the first soft resin 22, the soft part 26, and the handle part main body 31 are resin-molded using the second mold 51 shown in FIG. -2 (refer to FIG. 12).
In this way, when the flocked surface 21-1b comes into contact with the inner surface of one mold 51-2 constituting the second mold 51, the plurality of flocked holes 21-1B and the flocked surface 21-1b are in contact with the first. The formation of the soft resin 22 can be suppressed.
 植毛穴21-1Bは、植毛面21-1bを構成する側のベース部材本体21-1に複数設けられている。植毛穴21-1Bには、ブラシ部12を構成する毛束12-1が植毛される穴である。
 複数の植毛穴21-1Bの配列としては、例えば、図2に示すような配列を用いることが可能であるが、これに限定されず、いわゆる碁盤目状の配列や千鳥状の配列等、いかなる配列パターンであってもよい。
 また、複数の植毛穴21-1Bの数は、図2に示す植毛穴21-1Bの数に限定されず、例えば、10~60穴の範囲内で適宜設定することができる。
 つまり、複数の植毛穴21-1Bの配列、及び植毛穴21-1Bの数は、目的に応じて適宜設定することができる。
A plurality of flocking holes 21-1B are provided in the base member body 21-1 on the side constituting the flocking surface 21-1b. The flocking hole 21-1B is a hole into which the hair bundle 12-1 constituting the brush portion 12 is flocked.
For example, the arrangement shown in FIG. 2 can be used as the arrangement of the plurality of flock holes 21-1B. However, the arrangement is not limited to this, and any arrangement such as a so-called grid-like arrangement or a staggered arrangement may be used. It may be an array pattern.
Further, the number of the flocking holes 21-1B is not limited to the number of flocking holes 21-1B shown in FIG. 2, and can be set as appropriate within a range of, for example, 10 to 60 holes.
That is, the arrangement of the plurality of flocking holes 21-1B and the number of flocking holes 21-1B can be appropriately set according to the purpose.
 植毛穴21-1Bの形状としては、特に限定されず、例えば、真円形状、楕円等の円形状、三角形状や四角形状等の多角形状等を用いることができる。
 また、植毛穴21-1Bの直径は、毛束12-1の太さに応じて決定することができ、具体的には、例えば、1~3mmの範囲内で適宜設定することができる。
The shape of the flocking hole 21-1B is not particularly limited, and for example, a perfect circle shape, a circular shape such as an ellipse, a polygonal shape such as a triangular shape or a quadrangular shape, or the like can be used.
Further, the diameter of the flock hole 21-1B can be determined according to the thickness of the hair bundle 12-1, and can be appropriately set within a range of 1 to 3 mm, for example.
 Z方向におけるヘッド部14の厚さが5.0mmの場合、Z方向のベース部材本体21-1の厚さ(言い換えれば、底面21-1aと植毛面21-1bとの間の厚さ)は、例えば、4.2mmとすることができる。この場合、植毛面21-1bを基準としたときの複数の植毛穴21-1Bの深さは、例えば、2.5mmとすることができる。ヘッド部14の厚さとは、一例として、ヘッド部14におけるX方向の中央部分で測定した厚さである。 When the thickness of the head portion 14 in the Z direction is 5.0 mm, the thickness of the base member main body 21-1 in the Z direction (in other words, the thickness between the bottom surface 21-1a and the flocked surface 21-1b) is For example, it can be set to 4.2 mm. In this case, the depth of the plurality of flocking holes 21-1B with respect to the flocking surface 21-1b can be set to, for example, 2.5 mm. As an example, the thickness of the head portion 14 is a thickness measured at a central portion of the head portion 14 in the X direction.
 2つの支持部21-2は、ベース部材本体21-1の底面21-1aからZ方向(図1に示す状態の場合、下方)に突出するように設けられている。2つの支持部21-2のうち、一方がベース部材本体21-1の先端側に配置されており、他方がベース部材本体21-1の後端側に配置されている。2つの支持部21-2は、X方向において対向するように配置されている。2つの支持部21-2は、それぞれ平坦な面とされた突出面21-2aを有する。
 2つの突出面21-2aは、第1の軟質樹脂22の外面から露出されると共に、第1の軟質樹脂22の外面に対して面一とされている。すなわち、支持部21-2は、ヘッド部14における第2露出部として、図3に示すように、植毛面21-1bとは逆側に露出している。
The two support portions 21-2 are provided so as to protrude in the Z direction (downward in the case shown in FIG. 1) from the bottom surface 21-1a of the base member main body 21-1. One of the two support portions 21-2 is disposed on the front end side of the base member main body 21-1, and the other is disposed on the rear end side of the base member main body 21-1. The two support portions 21-2 are arranged to face each other in the X direction. The two support portions 21-2 each have a protruding surface 21-2a that is a flat surface.
The two protruding surfaces 21-2 a are exposed from the outer surface of the first soft resin 22 and are flush with the outer surface of the first soft resin 22. That is, as shown in FIG. 3, the support portion 21-2 is exposed as the second exposed portion of the head portion 14 on the side opposite to the flocked surface 21-1b.
 突出面21-2aは、後述する図11に示す第1の金型41を用いて、ベース部材本体21-1を含む硬質部材17を成型する際、第1の金型41(図11参照)の内面と接触する部分である。
 このように、突出面21-2aが第1の金型41(図11参照)の内面と接触することで、2つの支持部21-2の周囲及び底面21-1aに第1の軟質樹脂22を形成することができる。
When the hard member 17 including the base member main body 21-1 is molded using the first mold 41 shown in FIG. 11 to be described later, the protruding surface 21-2a is the first mold 41 (see FIG. 11). It is a part which contacts the inner surface of the.
As described above, the protruding surface 21-2a is in contact with the inner surface of the first mold 41 (see FIG. 11), whereby the first soft resin 22 is formed around the two support portions 21-2 and the bottom surface 21-1a. Can be formed.
 つまり、2つの支持部21-2の突出量(言い換えれば、底面21-1aを基準としたときの突出面21-2aまでの距離)は、底面21-1aに配置する第1の軟質樹脂22のZ方向の厚さと等しい。
 したがって、2つの支持部21-2の突出量は、底面21-1aに配置する第1の軟質樹脂22の厚さに応じて適宜設定することができる。Z方向におけるヘッド部14の厚さが5.0mmで、かつZ方向のベース部材本体21-1の厚さが4.2mmの場合、2つの支持部21-2の突出量は、例えば、0.8mmとすることができる。ヘッド部14およびベース部材本体21-1の厚さとは、一例として、ヘッド部14におけるX方向の中央部分で測定した厚さである。
That is, the protrusion amount of the two support portions 21-2 (in other words, the distance to the protrusion surface 21-2a with respect to the bottom surface 21-1a) is the first soft resin 22 arranged on the bottom surface 21-1a. Is equal to the thickness in the Z direction.
Therefore, the protruding amounts of the two support portions 21-2 can be appropriately set according to the thickness of the first soft resin 22 disposed on the bottom surface 21-1a. When the thickness of the head portion 14 in the Z direction is 5.0 mm and the thickness of the base member main body 21-1 in the Z direction is 4.2 mm, the protruding amount of the two support portions 21-2 is, for example, 0 .8 mm. The thicknesses of the head portion 14 and the base member main body 21-1 are, for example, thicknesses measured at the center portion of the head portion 14 in the X direction.
 なお、図1及び図3では、支持部21-2が2つの場合を例に挙げて説明したが、支持部21-2の数は1つ以上であればよく、2つに限定されない。 1 and 3, the case where there are two support portions 21-2 has been described as an example, but the number of support portions 21-2 may be one or more, and is not limited to two.
 上記構成とされたベース部材21は、その後端が芯部25の先端部(芯部25の一端)と一体的に構成されている。
 ベース部材21を構成する硬質樹脂としては、第1の軟質樹脂22よりも硬い樹脂を用いる。具体的には、ベース部材本体21-1を構成する硬質樹脂としては、例えば、曲げ弾性率(JIS K7203)が500~3000MPaの範囲内にある樹脂を用いることができる。
The base member 21 configured as described above has a rear end integrally formed with a tip portion of the core portion 25 (one end of the core portion 25).
As the hard resin constituting the base member 21, a resin harder than the first soft resin 22 is used. Specifically, as the hard resin constituting the base member main body 21-1, for example, a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa can be used.
 このような硬質樹脂の具体例としては、例えば、ポリプロピレン(PP)、ポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート(PBT)、ポリシクロへキシレンジメチレンテレフタレート(PCT)、ポリアセタール(POM)、ポリスチレン(PS)、アクリロニトリル・ブタジエン・スチレン樹脂(ABS)、セルロースプロピオネート(CP)、ポリアリレート、ポリカーボネート、アクリロニトリル・スチレン共重合樹脂(AS)等を例示することができるが、中でもポリブチレンテレフタレート(PBT)が好ましい。
 ポリブチレンテレフタレート(PBT)は、折れ強度が高いため、ベース部材21が折れたり、一部が欠損したりすることを抑制できる。上記硬質樹脂は、1種単独で使用してもよいし、2種以上を適宜組み合わせて用いてもよい。
Specific examples of such a hard resin include, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS). And acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), and the like. Among them, polybutylene terephthalate (PBT) is exemplified. preferable.
Since polybutylene terephthalate (PBT) has a high bending strength, the base member 21 can be prevented from being broken or partially broken. The said hard resin may be used individually by 1 type, and may be used in combination of 2 or more type as appropriate.
 第1の軟質樹脂22は、植毛面21-1b、複数の植毛穴21-1B、2つの支持部21-2の端面21-2aを露出させた状態で、ベース部材本体21-1の側面及び底面21-1aを覆うように設けられている。
 これにより、第1の軟質樹脂22は、ベース部材本体21-1の先端部21-1Aを覆うように配置されている。
The first soft resin 22 has a side surface of the base member main body 21-1 and a side surface of the base member main body 21-1 in a state where the flocked surface 21-1b, the plurality of flocked holes 21-1B, and the end surfaces 21-2a of the two support portions 21-2 are exposed. It is provided so as to cover the bottom surface 21-1a.
Thus, the first soft resin 22 is disposed so as to cover the tip portion 21-1A of the base member main body 21-1.
 このように、ベース部材本体21-1の先端部21-1Aを覆うように第1の軟質樹脂22を配置することで、使用者が歯ブラシ10を使用時において、先端部21-1Aに配置された第1の軟質樹脂22がクッション材として機能するため、歯ブラシ10の後端側から先端側に向かう方向に外力が加えられて、先端21-1Aに配置された第1の軟質樹脂22が使用者の口腔内に強く押し当てられた際、使用者の口腔内が損傷することを抑制できる。 In this way, by arranging the first soft resin 22 so as to cover the tip portion 21-1A of the base member main body 21-1, the user can place the toothbrush 10 at the tip portion 21-1A. Since the first soft resin 22 functions as a cushioning material, an external force is applied in the direction from the rear end side to the front end side of the toothbrush 10, and the first soft resin 22 disposed at the front end 21-1A is used. It is possible to prevent the user's oral cavity from being damaged when strongly pressed into the user's oral cavity.
 ベース部材本体21-1の側面及び底面21-1aに配置する第1の軟質樹脂22の厚さは、例えば、目的に応じて、0.2~2.0mmの範囲内で適宜設定することが可能であるが、例えば、0.8mmとすることができる。 The thickness of the first soft resin 22 disposed on the side surface and the bottom surface 21-1a of the base member main body 21-1 can be appropriately set within a range of 0.2 to 2.0 mm, for example, depending on the purpose. Although it is possible, it can be 0.8 mm, for example.
 なお、図1~図3では、一例として、ベース部材本体21-1の側面及び底面21-1aを覆うように第1の軟質樹脂22を設けた場合を例に挙げて説明したが、第1の軟質樹脂22は、少なくともベース部材本体21-1の先端部21-1Aを覆うように配置されていればよい。 1 to 3, as an example, the case where the first soft resin 22 is provided so as to cover the side surface and the bottom surface 21-1a of the base member body 21-1 has been described as an example. The soft resin 22 may be disposed so as to cover at least the tip portion 21-1A of the base member main body 21-1.
 第1の軟質樹脂22としては、例えば、その硬度が、JIS K 7215 ショアAの硬度が90以下である軟質樹脂を用いるとよい。このような軟質樹脂としては、例えば、ポリオレフィン系エラストマー、スチレン系エラストマー、ポリエステル系エラストマー等のエラストマー樹脂を例示することができるが、中でもポリプロピレン(PP)との溶着性の観点からスチレン系エラストマーが好ましい。
 スチレン系エラストマーの具体例としては、例えば、株式会社クラレ製のセプトン(商品名)、リケンテクノス株式会社製のレオストマー(商品名)等を例示することができる。
As the first soft resin 22, for example, a soft resin having a hardness of JIS K 7215 Shore A of 90 or less may be used. Examples of such a soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, and polyester elastomers. Among them, styrene elastomers are preferable from the viewpoint of weldability with polypropylene (PP). .
Specific examples of the styrenic elastomer include, for example, Kuraray Co., Ltd. Septon (trade name), Riken Technos Co., Ltd. Rheostomer (trade name), and the like.
 また、第1の軟質樹脂22は、ベース部材21を構成する硬質樹脂の種類に応じて、適宜選択するとよい。
 具体的には、ベース部材21を構成する硬質樹脂として、ポリプロピレン(PP)を用いる場合、第1の軟質樹脂22としては、例えば、ポリオレフィン系エラストマー、スチレン系エラストマーが好ましく、スチレン系エラストマーがより好ましい。
 ベース部材21を構成する硬質樹脂と第1の軟質樹脂22との組み合わせを、上記組み合わせとすることで、ベース部材21と第1の軟質樹脂22との間の密着性を十分に確保することができる。
Further, the first soft resin 22 may be appropriately selected according to the type of hard resin constituting the base member 21.
Specifically, when polypropylene (PP) is used as the hard resin constituting the base member 21, the first soft resin 22 is preferably, for example, a polyolefin-based elastomer or a styrene-based elastomer, and more preferably a styrene-based elastomer. .
By making the combination of the hard resin and the first soft resin 22 constituting the base member 21 the above combination, sufficient adhesion between the base member 21 and the first soft resin 22 can be ensured. it can.
 上記構成とされたヘッド部14の長さ(X方向の長さ)は、特に限定されず、例えば、10~30mmの範囲内が好ましく、12~28mmの範囲内がより好ましい。
 ヘッド部14の長さが10mm以上であると、毛束12-1を植設可能な植毛面21-1bの面積を十分に確保することができる。また、ヘッド部14の長さが30mm以下であると、口腔内での歯ブラシ10の操作性を高めることができる。
The length (the length in the X direction) of the head unit 14 having the above configuration is not particularly limited, and is preferably in the range of 10 to 30 mm, and more preferably in the range of 12 to 28 mm.
When the length of the head portion 14 is 10 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 can be implanted. Moreover, the operativity of the toothbrush 10 in an intraoral area can be improved as the length of the head part 14 is 30 mm or less.
 上記構成とされたヘッド部14の幅(ヘッド部14におけるY方向の最大幅)は、特に限定されず、例えば、7~13mmの範囲内が好ましく、8~12mmの範囲内がより好ましい。
 ヘッド部14の幅が7mm以上であると、毛束12-1が植設される植毛面21-1bの面積を十分に確保することができる。
 また、ヘッド部14の幅が13mm以下であると、口腔内での歯ブラシ10の操作性を高めることができる。
The width of the head portion 14 having the above configuration (the maximum width in the Y direction in the head portion 14) is not particularly limited, and is preferably in the range of 7 to 13 mm, and more preferably in the range of 8 to 12 mm.
When the width of the head portion 14 is 7 mm or more, it is possible to sufficiently secure the area of the flocked surface 21-1b on which the hair bundle 12-1 is implanted.
Moreover, the operativity of the toothbrush 10 in oral cavity can be improved as the width | variety of the head part 14 is 13 mm or less.
 ここで、図2を参照して、ヘッド部14の後端とネック部15の先端との境界の位置、及びネック部15の後端とハンドル部16の先端との境界の位置について定義する。
 本発明では、植毛面21-1bとハンドル部16との間において、Y方向の幅がヘッド部14の最大幅と同一、またはヘッド部14の最大幅よりも小さい箇所をネック部に含む。
 なお、本実施形態では、ヘッド部14の先端からハンドル部16の後端に向かうX方向において、Y方向の幅が狭くなり、該幅の変化量が大きくなり、やがてY方向の該幅の変化量がほとんどなくなる位置を、ヘッド部14の後端とネック部15の先端との境界の位置とする。
 また、ネック部15の先端からハンドル部16の後端に向かうX方向において、Y方向の幅が広くなり、該幅の変化量が大きくなり、やがてY方向の該幅の変化量がほとんどなくなる位置を、ネック部15の後端とハンドル部16の先端との境界の位置とする。
 なお、本発明において、ヘッド部14の先端からX方向においてヘッド部14の先端から最も離間した位置に配置された植毛穴のハンドル部16の後端側の位置を、ヘッド部14の後端とネック部15の先端との境界の位置としてもよい。
 X方向におけるネック部15の長さは、例えば、20~60mmの範囲内で適宜設定することができ、この場合、ヘッド部の長さとネック部の長さとを合計した長さは、例えば、40~85mmの範囲内で適宜設定することができる。
Here, referring to FIG. 2, the position of the boundary between the rear end of the head portion 14 and the tip of the neck portion 15 and the position of the boundary between the rear end of the neck portion 15 and the tip of the handle portion 16 are defined.
In the present invention, a portion where the width in the Y direction is the same as the maximum width of the head portion 14 or smaller than the maximum width of the head portion 14 between the flocked surface 21-1b and the handle portion 16 is included in the neck portion.
In the present embodiment, in the X direction from the front end of the head portion 14 toward the rear end of the handle portion 16, the width in the Y direction becomes narrower, the amount of change in the width increases, and the change in the width in the Y direction eventually. The position where the amount is almost eliminated is defined as the boundary position between the rear end of the head portion 14 and the tip of the neck portion 15.
Further, in the X direction from the front end of the neck portion 15 toward the rear end of the handle portion 16, the width in the Y direction becomes wider, the amount of change in the width increases, and eventually the amount of change in the width in the Y direction almost disappears. Is the position of the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16.
In the present invention, the position of the rear end side of the handle portion 16 of the flock hole disposed at the position farthest from the front end of the head portion 14 in the X direction from the front end of the head portion 14 is defined as the rear end of the head portion 14. It is good also as a position of a boundary with the tip of neck part 15.
The length of the neck portion 15 in the X direction can be appropriately set within a range of, for example, 20 to 60 mm. In this case, the total length of the head portion and the neck portion is, for example, 40 It can be appropriately set within a range of ˜85 mm.
 ネック部15は、ヘッド部14とハンドル部16とを接続する部分である。Y方向におけるネック部15の幅は、ヘッド部14及びハンドル部16の幅よりも狭くなるように構成されている。Z方向におけるネック部15の厚さは、例えば、ヘッド部14の厚さと同じ厚さにすることができる。 The neck portion 15 is a portion that connects the head portion 14 and the handle portion 16. The width of the neck portion 15 in the Y direction is configured to be narrower than the width of the head portion 14 and the handle portion 16. The thickness of the neck portion 15 in the Z direction can be the same as the thickness of the head portion 14, for example.
 ネック部15は、硬質部材17の構成要素である芯部25と、軟質部26と、を有する。
 芯部25は、X方向(ネック部15の延在方向)に延在し、かつネック部15を貫通する第1の部分25-1と、X方向に延在し、一端が第1の部分25-1と一体にされると共に、ハンドル部16の一部に配置された第2の部分25-2と、を有する。
 なお、ここでは、ネック部15を構成する第1の部分25-1について説明し、第2の部分25-2については、ハンドル部16の構成を説明する際に説明する。
The neck portion 15 includes a core portion 25 that is a component of the hard member 17 and a soft portion 26.
The core portion 25 extends in the X direction (extending direction of the neck portion 15), and extends through the neck portion 15, and extends in the X direction. One end of the core portion 25 is the first portion. 25-1 and a second portion 25-2 disposed in a part of the handle portion 16 and integrated with the 25-1.
Here, the first portion 25-1 constituting the neck portion 15 will be described, and the second portion 25-2 will be described when the configuration of the handle portion 16 is described.
 図8は、図4に示す硬質部材(具体的には、第1の部分)のB-B線方向の断面図である。図8において、図1~図6に示す構造体と同一構成部分には、同一符号を付す。また、図8では、説明の便宜上、硬質部材17の構成要素以外の歯ブラシ10の構成要素の符号も図示する。図8では、説明の便宜上、ネック部15の符号を図示する。 FIG. 8 is a cross-sectional view of the hard member (specifically, the first portion) shown in FIG. 4 in the BB line direction. In FIG. 8, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals. Moreover, in FIG. 8, the code | symbol of the component of the toothbrush 10 other than the component of the hard member 17 is also illustrated for convenience of explanation. In FIG. 8, the code | symbol of the neck part 15 is shown for convenience of explanation.
 図1~図6、及び図8を参照するに、第1の部分25-1は、その一端がベース部材21の後端と一体に構成されており、他端が第2の部分25-2と一体的に構成されている。
 第1の部分25-1は、硬質樹脂で構成されている。第1の部分25-1は、第1の軟質樹脂22、及び軟質部26を構成する第2の軟質樹脂27よりも硬い硬質樹脂(曲げ弾性率(JIS K7203)が500~3000MPaの範囲内にある硬質樹脂)で構成されている。
Referring to FIGS. 1 to 6 and 8, the first portion 25-1 has one end integrally formed with the rear end of the base member 21, and the other end is the second portion 25-2. It is configured integrally with.
The first portion 25-1 is made of a hard resin. The first portion 25-1 has a hard resin (bending elastic modulus (JIS K7203)) in the range of 500 to 3000 MPa that is harder than the first soft resin 22 and the second soft resin 27 constituting the soft portion 26. A certain hard resin).
 第1の部分25-1は、X方向において同じ太さとされている。ヘッド部14の先端に強い外力が印加された際、ネック部15が、図2に示す変形部15A(例えば、ネック部15の中央部近傍)において折れ曲がるように(言い換えれば、ヘッド部14の先端に加わる力を逃がすように)、第1の部分25-1の太さや形状、及び第1の部分25-1の周囲に配置される軟質部26の厚さは、決定するとよい。 The first portion 25-1 has the same thickness in the X direction. When a strong external force is applied to the tip of the head part 14, the neck part 15 is bent at the deformed part 15A shown in FIG. 2 (for example, near the center of the neck part 15) (in other words, the tip of the head part 14). The thickness and shape of the first portion 25-1 and the thickness of the soft portion 26 disposed around the first portion 25-1 may be determined so as to release the force applied to the first portion 25-1.
 具体的には、X方向に対して直交する面でネック部15におけるX方向の中央部分を切断した際に得られるネック部15の切断面の面積(第1の部分25-1の切断面25-1aの面積S1と、軟質部26の切断面の面積S2と、を合計した面積)を100%としたときに、第1の部分25-1の切断面25-1aの面積S1が5%以上50%未満にするとよく、好ましくは、例えば、27%にするとよい。 Specifically, the area of the cut surface of the neck portion 15 obtained by cutting the central portion in the X direction of the neck portion 15 with a plane orthogonal to the X direction (the cut surface 25 of the first portion 25-1). -1a area S1 and the area S2 of the cut surface of the soft part 26 is 100%), the area S1 of the cut surface 25-1a of the first portion 25-1 is 5%. The amount may be less than 50%, and preferably 27%, for example.
 X方向に対して直交する面で切断した際の第1の部分25-1の形状としては、例えば、円形状、楕円形状、正方形、長方形、菱形、星型等を用いることができる。また、使用者の安全性を考慮すると、第1の部分25-1の角部は、丸みを帯びた形状(ラウンド形状)にするとよい。 As the shape of the first portion 25-1 when cut along a plane orthogonal to the X direction, for example, a circular shape, an elliptical shape, a square shape, a rectangular shape, a diamond shape, a star shape, or the like can be used. In consideration of the safety of the user, the corner of the first portion 25-1 is preferably rounded (round shape).
 ところで、歯ブラシ10を用いて、歯を磨く際、ネック部15は、Z方向(言い換えれば、ブラシ部12の先端を歯や歯間等に押し当てる際に力が加えられる方向)に対して、変形しにくいこと(言い換えれば、ブラシ部12の先端をしっかりと歯や歯間等に押し当てることが可能なこと)が好ましい。 By the way, when brushing teeth using the toothbrush 10, the neck portion 15 is in the Z direction (in other words, the direction in which a force is applied when pressing the tip of the brush portion 12 between the teeth or between teeth). It is preferable that the material is not easily deformed (in other words, the tip of the brush portion 12 can be firmly pressed against teeth or between teeth).
 したがって、Z方向(植毛面21-1bに対して直交する第1の方向)における第1の部分25-1の第1の幅W1は、Z方向と直交するY方向(第2の方向)における第1の部分の第2の幅W2よりも大きくするとよい。第1の幅W1は、例えば、1.5mm~3.0mmであり、第2の幅W2は、例えば、1.5mm~2.0mmである。 Therefore, the first width W1 of the first portion 25-1 in the Z direction (first direction orthogonal to the flocked surface 21-1b) is in the Y direction (second direction) orthogonal to the Z direction. It may be larger than the second width W2 of the first portion. The first width W1 is, for example, 1.5 mm to 3.0 mm, and the second width W2 is, for example, 1.5 mm to 2.0 mm.
 このように、Z方向における第1の部分25-1の第1の幅W1を、Y方向における第1の部分の第2の幅W2よりも大きくすることで、歯ブラシ10の清掃性能を低下させることなく、ヘッド部14の先端に強い外力が印加された際に変形部15AにおいてY方向に折れ曲がることが可能となる。これにより、ヘッド部14の先端に加わる力を逃がすことが可能となるので、歯ブラシ10の使用者の口腔内が損傷することを抑制できる。 Thus, the cleaning performance of the toothbrush 10 is reduced by making the first width W1 of the first portion 25-1 in the Z direction larger than the second width W2 of the first portion in the Y direction. Instead, when a strong external force is applied to the tip of the head portion 14, the deformable portion 15A can be bent in the Y direction. Thereby, since it becomes possible to escape the force added to the front-end | tip of the head part 14, it can suppress that the oral cavity of the user of the toothbrush 10 is damaged.
 特に、歯ブラシ10の使用者が1~3才の乳幼児である場合、歯ブラシ10を口にくわえたままの状態で、走ったりする場合があるが、このような場合に乳幼児が転倒した際でも乳幼児の口腔内が損傷することを抑制できる。 In particular, when the user of the toothbrush 10 is an infant of 1 to 3 years old, it may run with the toothbrush 10 held in the mouth. In such a case, even if the infant falls, the infant It is possible to prevent the oral cavity from being damaged.
 Z方向における第1の部分25-1の第1の幅W1がY方向における第1の部分の第2の幅W2よりも大きくなるような第1の部分25-1の断面形状としては、図8に示すような楕円、長方形、菱形等を例示することができる。この場合、楕円とは、2つの焦点からの距離の和が一定である点の集合から作られる曲線の他に、同一半径の2つの半円を平行な二つの接線で繋げた長円も含む。
 楕円や菱形の断面形状とされた第1の部分25-1を用いる場合、第1の幅W1の最大値が第2の幅W2の最大値よりも大きくなるように構成すればよい。
 また、図8において、ネック部15の直径R1が3.95mmの場合、第1の幅W1は、例えば、1.975mmとすることができる。このとき、第2の幅W2は、例えば、1.7mmとすることができる。
As a cross-sectional shape of the first portion 25-1, the first width W1 of the first portion 25-1 in the Z direction is larger than the second width W2 of the first portion in the Y direction. An ellipse, a rectangle, a rhombus, etc. as shown in FIG. In this case, the ellipse includes an ellipse in which two semicircles having the same radius are connected by two parallel tangents in addition to a curve formed from a set of points having a constant sum of distances from two focal points. .
When the first portion 25-1 having an elliptical or rhombic cross-sectional shape is used, the maximum value of the first width W1 may be configured to be larger than the maximum value of the second width W2.
Further, in FIG. 8, when the diameter R1 of the neck portion 15 is 3.95 mm, the first width W1 can be set to 1.975 mm, for example. At this time, the second width W2 can be set to 1.7 mm, for example.
 軟質部26は、第1の部分25-1を内部に収容し、かつ芯部25を構成する硬質樹脂よりも軟らかい第2の軟質樹脂27で構成されている。軟質部26は、第1の部分25-1が露出されることを抑制する部材であると共に、ヘッド部14の先端に強い力が加えられた際にネック部15の変形部15Aが折れ曲がるようにするための部材である。
 第2の軟質樹脂27としては、例えば、JIS K 6253 ショアAでの硬度が90以下とされた軟質樹脂を用いることができる。このような軟質樹脂としては、第1の軟質樹脂22を説明する際に例示した軟質樹脂を用いることができる。
The soft part 26 is composed of a second soft resin 27 that houses the first part 25-1 and is softer than the hard resin that constitutes the core part 25. The soft portion 26 is a member that prevents the first portion 25-1 from being exposed, and the deformed portion 15A of the neck portion 15 is bent when a strong force is applied to the tip of the head portion 14. It is a member for doing.
As the second soft resin 27, for example, a soft resin having a hardness of 90 or less according to JIS K 6253 Shore A can be used. As such a soft resin, the soft resin exemplified when explaining the first soft resin 22 can be used.
 第2の軟質樹脂27は、目的に応じて、第1の軟質樹脂22とは異なる種類の軟質樹脂で構成してもよい。この場合、例えば、第1の軟質樹脂22として使用する軟質樹脂の硬度を第2の軟質樹脂27に使用する軟質樹脂の硬度よりも高くしてもよい。このような構成とすることで、ヘッド部14の先端の硬さと、ネック部15の硬さと、を異ならせることができる。
 また、第1及び第2の軟質樹脂22,27として、同じ種類の軟質樹脂を用いてもよい。これにより、歯ブラシ10を製造する際に使用する軟質樹脂の種類の数を少なくすることができる。
The second soft resin 27 may be made of a different kind of soft resin from the first soft resin 22 depending on the purpose. In this case, for example, the hardness of the soft resin used as the first soft resin 22 may be higher than the hardness of the soft resin used for the second soft resin 27. By setting it as such a structure, the hardness of the front-end | tip of the head part 14 and the hardness of the neck part 15 can be varied.
Further, the same kind of soft resin may be used as the first and second soft resins 22 and 27. Thereby, the number of types of soft resin used when manufacturing the toothbrush 10 can be reduced.
 図8では、一例として、軟質部26の切断面の外形が円形状である場合を例に挙げて説明したが、軟質部26の切断面の外形は、これに限定されない。
 例えば、図8に示す切断面25-1aが楕円形状とされた第1の部分25-1を用いる場合、軟質部26の切断面の外形として、例えば、長軸の一部が切断面25-1aの長軸と一致する楕円形状あるいは上述した長円形状を用いてもよい。また、切断面25-1aが楕円形状や長円形状、あるいは多角形状である場合、ネック部15の直径R1は、切断面25-1aの外接円に応じた値に設定すればよい。
In FIG. 8, as an example, the case where the outer shape of the cut surface of the soft portion 26 is circular has been described as an example, but the outer shape of the cut surface of the soft portion 26 is not limited thereto.
For example, when the first portion 25-1 having an elliptical cut surface 25-1a shown in FIG. 8 is used, as the outer shape of the cut surface of the soft portion 26, for example, a part of the long axis is the cut surface 25- An elliptical shape coinciding with the major axis of 1a or the above-described oval shape may be used. When the cut surface 25-1a is elliptical, oval, or polygonal, the diameter R1 of the neck portion 15 may be set to a value corresponding to the circumscribed circle of the cut surface 25-1a.
 図1~図6を参照するに、ハンドル部16は、芯部25を構成する第2の部分25-2(芯部25の一部)と、硬質部材17を構成する複数の突出部29と、ハンドル部本体31と、リング状窪み部32-1,32-2(リング状の窪み部)と、第1のリブ部34と、第2のリブ部35と、第3のリブ部37と、を有する。 With reference to FIGS. 1 to 6, the handle portion 16 includes a second portion 25-2 (a part of the core portion 25) constituting the core portion 25, and a plurality of projecting portions 29 constituting the hard member 17. The handle portion main body 31, the ring-shaped depressions 32-1, 32-2 (ring-shaped depressions), the first rib 34, the second rib 35, and the third rib 37 Have.
 図9は、図4に示す硬質部材(具体的には、第2の部分)のC-C線方向の断面図である。図10は、図4に示す硬質部材(具体的には、第2の部分)のD-D線方向の断面図である。
 図9及び図10において、図1~図6に示す構造体と同一構成部分には、同一符号を付す。図9及び図10では、説明の便宜上、ハンドル部16の符号を図示する。また、図9及び図10では、説明の便宜上、ハンドル部16の構成要素以外の歯ブラシ10の構成要素の符号も図示する。
FIG. 9 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the CC line direction. 10 is a cross-sectional view of the hard member (specifically, the second portion) shown in FIG. 4 in the DD line direction.
9 and 10, the same components as those shown in FIGS. 1 to 6 are denoted by the same reference numerals. In FIG. 9 and FIG. 10, the code | symbol of the handle | steering-wheel part 16 is shown for convenience of explanation. 9 and 10 also illustrate reference numerals of the constituent elements of the toothbrush 10 other than the constituent elements of the handle portion 16 for convenience of explanation.
 図1~図6、図9、及び図10を参照するに、第2の部分25-2は、硬質樹脂で構成されており、その一端が第1の部分25-1と一体とされている。第2の部分25-2を構成する硬質樹脂は、例えば、第1の部分25-1を構成する硬質樹脂と同様なものを用いることができる。 1 to 6, 9, and 10, the second portion 25-2 is made of a hard resin, and one end thereof is integrated with the first portion 25-1. . As the hard resin constituting the second portion 25-2, for example, the same hard resin as that constituting the first portion 25-1 can be used.
 第2の部分25-2は、X方向において、第2の部分25-2の一端から複数の柱状の突出部29に向かうにつれて、X方向と直交する断面形状が連続的に拡径された相似形である構成とされている。つまり、第2の部分25-2のうち、複数の突出部29が設けられた部分の径が最も大きくなるように構成されている。
 また、第2の部分25-2のうち、複数の突出部29よりもハンドル部16の後端側に配置された部分は、複数の突出部29からハンドル部16の後端側に向かうにつれて、X方向と直交する断面形状が連続的に径が小さくなる相似形とされている。
The second portion 25-2 is similar to the X-direction in which the cross-sectional shape perpendicular to the X direction is continuously expanded from one end of the second portion 25-2 toward the plurality of columnar protrusions 29. It is configured as a shape. That is, the second portion 25-2 is configured such that the diameter of the portion provided with the plurality of protrusions 29 is the largest.
Further, the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of projecting portions 29 increases from the plurality of projecting portions 29 toward the rear end side of the handle portion 16. The cross-sectional shape orthogonal to the X direction is a similar shape whose diameter continuously decreases.
 このように、第2の部分25-2のうち、複数の突出部29よりもハンドル部16の後端側に配置された部分の形状を、複数の突出部29からハンドル部16の後端側に向かうにつれて径が小さくなる形状とすることにより、例えば、第1及び第2の軟質樹脂22,27として同じ軟質樹脂を用いる場合において、後述する図12に示すように、第2の金型51内に硬質部材17を配置させた後、第2の金型51の後端側から第2の金型51内に軟質樹脂を導入させた際、ヘッド部14の先端に向かう方向(X方向)に軟質樹脂が移動(流動)しやすくなるため、硬質部材17全体(但し、植毛面21-1b、及び複数の植毛穴21-1Bを除く)を精度良く軟質樹脂で包み込むことができる。
 また、後述するように、第2の金型51内に上記軟質樹脂を導入させた際、導入された軟質樹脂により、第2の金型51内における硬質部材17の位置及び姿勢が変化することを抑制できる。
As described above, the shape of the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of protrusion portions 29 is changed from the plurality of protrusion portions 29 to the rear end side of the handle portion 16. For example, in the case where the same soft resin is used as the first and second soft resins 22 and 27, as shown in FIG. When the soft resin is introduced into the second mold 51 from the rear end side of the second mold 51 after the hard member 17 is disposed therein, the direction toward the front end of the head portion 14 (X direction) Since the soft resin easily moves (flows), the entire hard member 17 (except the flocked surface 21-1b and the plurality of flocked holes 21-1B) can be accurately wrapped with the soft resin.
Further, as described later, when the soft resin is introduced into the second mold 51, the position and posture of the hard member 17 in the second mold 51 are changed by the introduced soft resin. Can be suppressed.
 なお、図2に示すように、第2の部分25-2は、ハンドル部16の先端部に内設させることが好ましいが、これに限定されない。第2の部分25-2は、例えば、ネック部15に内設させてもよい。 Note that, as shown in FIG. 2, the second portion 25-2 is preferably provided at the tip of the handle portion 16, but is not limited thereto. For example, the second portion 25-2 may be provided in the neck portion 15.
 複数の突出部29は、本実施の形態の場合、一例として4つ設けられている。4つの突出部29は、第2の部分25-2のうち、最も径の太い部分の周方向に配置されている。
 隣り合う位置に配置された2つの突出部29の成す角度は、例えば、90度とすることができる。隣り合う位置に配置された2つの突出部29間に形成される空間は、後述する図12に示す第2の金型51内に軟質樹脂を導入させる際の経路として機能する。該空間を介して、該軟質樹脂は、ヘッド部21の先端側に供給され、固まる(硬化する)ことで、第1の軟質樹脂22となる。
In the case of the present embodiment, four protrusions 29 are provided as an example. The four protruding portions 29 are arranged in the circumferential direction of the thickest portion of the second portion 25-2.
An angle formed by two projecting portions 29 arranged at adjacent positions can be set to 90 degrees, for example. A space formed between two projecting portions 29 arranged at adjacent positions functions as a path for introducing a soft resin into a second mold 51 shown in FIG. 12 described later. The soft resin is supplied to the distal end side of the head portion 21 through the space and is hardened (cured) to become the first soft resin 22.
 複数の突出部29は、それぞれ突出面29aを有する。複数の突出部29の突出面29aは、ハンドル部本体31の外面(言い換えれば、ハンドル部16の外面)から露出されると共に、ハンドル部本体31の外面(ハンドル部16の外面)に対して面一となるように構成されている。
 図1、図2および図10に示すように、+Z側に位置する第1突出部としての突出部29は、ハンドル部31(軟質部26)の開口部31aを介して植毛面21-1b側に露出する。-Z側に位置する第2突出部としての突出部29は、ハンドル部31(軟質部26)の開口部31bを介して植毛面21-1bとは逆側に露出する。+Y側に位置する突出部29は、ハンドル部31(軟質部26)の開口部31cを介して+Y側に露出する。-Y側に位置する突出部29は、ハンドル部16(軟質部26)の開口部31cを介して-Y側に露出する。図1および図2に示されるように、ハンドル部16における軟質部26は、先端側に向けて先細る先細り部31Aを有しており、開口部31a~31dは、先細り部31Aに形成されている。換言すると、突出部29は、ハンドル部16における先細り部31Aに形成された開口部31a~31dを介して外部に露出している。
Each of the plurality of protruding portions 29 has a protruding surface 29a. The projecting surfaces 29a of the plurality of projecting portions 29 are exposed from the outer surface of the handle portion main body 31 (in other words, the outer surface of the handle portion 16) and face the outer surface of the handle portion main body 31 (the outer surface of the handle portion 16). It is comprised so that it may become one.
As shown in FIG. 1, FIG. 2 and FIG. 10, the protruding portion 29 as the first protruding portion located on the + Z side is located on the flocked surface 21-1b side through the opening 31a of the handle portion 31 (soft portion 26). Exposed to. The protruding portion 29 as the second protruding portion located on the −Z side is exposed to the side opposite to the flocked surface 21-1b through the opening 31b of the handle portion 31 (soft portion 26). The protruding portion 29 located on the + Y side is exposed to the + Y side via the opening 31c of the handle portion 31 (soft portion 26). The protruding portion 29 located on the −Y side is exposed to the −Y side through the opening 31c of the handle portion 16 (soft portion 26). As shown in FIGS. 1 and 2, the soft portion 26 in the handle portion 16 has a tapered portion 31A that tapers toward the distal end side, and the openings 31a to 31d are formed in the tapered portion 31A. Yes. In other words, the protruding portion 29 is exposed to the outside through the openings 31a to 31d formed in the tapered portion 31A of the handle portion 16.
 図10に示されるように、ハンドル部16の外面の断面形状が略円形状であることから、突出面29aの断面形状は円弧形状である。従って、各突出面29aは、径方向外側に臨んで露出するとともに、歯ブラシ10の長さ方向および径方向と直交する方向に臨んで露出する。具体的には、例えば、図10において、+Z側に位置する第1突出部としての突出部29の突出面29aは、+Z側に臨んで露出するとともに、+Y側および-Y側に臨んで露出する。同様に、例えば、図10において、-Z側に位置する第2突出部としての突出部29の突出面29aは、-Z側に臨んで露出するとともに、+Y側および-Y側に臨んで露出する。 As shown in FIG. 10, since the cross-sectional shape of the outer surface of the handle portion 16 is substantially circular, the cross-sectional shape of the protruding surface 29a is an arc shape. Accordingly, each projecting surface 29a is exposed to the outside in the radial direction and exposed to the length direction of the toothbrush 10 and the direction orthogonal to the radial direction. Specifically, for example, in FIG. 10, the protruding surface 29a of the protruding portion 29 as the first protruding portion located on the + Z side is exposed facing the + Z side and exposed facing the + Y side and the −Y side. To do. Similarly, for example, in FIG. 10, the projecting surface 29a of the projecting portion 29 as the second projecting portion located on the −Z side is exposed facing the −Z side, and exposed facing the + Y side and the −Y side. To do.
 複数の突出部29は、第2の金型51(図12参照)を用いて、第2の金型51の空間53内に硬質部材17を配置させて、ハンドル部本体31を成型する際、突出面29aが第2の金型51の内面と接触することで、ベース部材21を構成する2つの支持部21-12と共に、空間内における硬質部材17の姿勢を維持する機能を有する(詳細は後述する)。第2の金型51内に硬質部材17が収容された状態において、4つの突出部29は、その突出面29aが第2の金型51の内面と接触することで、4方から硬質部材17の後端を支持する。 The plurality of projecting portions 29 are formed by using the second mold 51 (see FIG. 12) to dispose the hard member 17 in the space 53 of the second mold 51 and molding the handle body 31. The protruding surface 29a comes into contact with the inner surface of the second mold 51, thereby having the function of maintaining the posture of the hard member 17 in the space together with the two support portions 21-12 constituting the base member 21 (details are given below) Will be described later). In a state where the hard member 17 is accommodated in the second mold 51, the four projecting portions 29 have the projecting surfaces 29 a in contact with the inner surface of the second mold 51, so that the hard member 17 is viewed from four directions. Support the rear end.
 複数の突出部29の突出量は、複数の突出部29の周囲に配置する第2の軟質樹脂27の厚さと等しい。よって、複数の突出部29の突出量は、複数の突出部29の周囲に配置する第2の軟質樹脂27の所望の厚さに応じて、第2の軟質樹脂27の表面と面一となる値に適宜設定することができる。
 図10において、第2の部分25-2の直径R2が5.6mmの場合、複数の突出部29の突出量T1は、例えば、1.77mmとすることができる。
The protrusion amount of the plurality of protrusions 29 is equal to the thickness of the second soft resin 27 disposed around the plurality of protrusions 29. Therefore, the protrusion amounts of the plurality of protrusions 29 are flush with the surface of the second soft resin 27 according to the desired thickness of the second soft resin 27 disposed around the plurality of protrusions 29. The value can be set as appropriate.
In FIG. 10, when the diameter R2 of the second portion 25-2 is 5.6 mm, the protruding amount T1 of the plurality of protruding portions 29 can be set to 1.77 mm, for example.
 なお、図1~図6、及び図10では、複数の突出部29の一例として、4つの突出部29を有する場合を例に挙げて説明したが、複数の突出部29の数は、4つに限定されない。
 例えば、複数の突出部29の数は、例えば、3つ(この場合、隣り合う位置に配置された突出部29が成す角度が120度となるように配置する)でもよいし、2つ以上8つ以下でよい。
 また、複数の突出部29の形状は、複数の突出部29の後端側からベース部材21の先端側へ軟質樹脂を流動させることの可能な流動経路を有した形状であればよく、図1~図6、及び図10に示す突出部29の形状は円柱状に限定されない。柱状の複数の突出部29の断面形状は、例えば、デザイン性に優れた星型やハート型等にしてもよい。
1 to 6 and FIG. 10, as an example of the plurality of protrusions 29, the case of having four protrusions 29 has been described as an example. However, the number of the plurality of protrusions 29 is four. It is not limited to.
For example, the number of the plurality of protrusions 29 may be, for example, three (in this case, the angle formed by the protrusions 29 arranged at adjacent positions is 120 degrees), or two or more 8 No more than two.
Further, the shape of the plurality of protrusions 29 may be a shape having a flow path that allows the soft resin to flow from the rear end side of the plurality of protrusions 29 to the front end side of the base member 21. FIG. The shape of the protrusion 29 shown in FIGS. 6 and 10 is not limited to a cylindrical shape. The cross-sectional shape of the plurality of columnar protrusions 29 may be, for example, a star shape or a heart shape excellent in design.
 図1~図3を参照するに、ハンドル部本体31は、歯ブラシ10の使用者が手で掴む部分であり、第2の軟質樹脂27で構成されている。
 このように、ハンドル部本体31を第2の軟質樹脂27で構成することで、歯ブラシ10を口にくわえた状態で、歯ブラシ10の後端からヘッド部14の先端に向かう方向に強い外力が加えられた際、ハンドル部本体31を変形させる(具体的には、曲げる)ことが可能となる。
 これにより、ネック部15だけでなく、ハンドル部本体31も曲がることで、歯ブラシ10の後端からヘッド部14の先端に向かう外力を、これとは異なる方向に逃がすことが可能となるので、歯ブラシ10の使用者の口腔内が損傷することを抑制できる。
With reference to FIGS. 1 to 3, the handle portion main body 31 is a portion that the user of the toothbrush 10 grips with a hand, and is constituted by the second soft resin 27.
In this way, by configuring the handle portion main body 31 with the second soft resin 27, a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the toothbrush 10 held in the mouth. When this is done, the handle portion body 31 can be deformed (specifically, bent).
As a result, not only the neck portion 15 but also the handle portion main body 31 is bent, so that it is possible to release an external force from the rear end of the toothbrush 10 toward the front end of the head portion 14 in a different direction. Damage to the oral cavity of 10 users can be suppressed.
 また、第2の軟質樹脂27を用いて、ハンドル部本体31を構成することで、ハンドル部本体31に強い力が加えられた場合でも、ハンドル部16が破損すること(言い換えれば、ハンドル部16が折れること)を抑制できる。 Further, by configuring the handle portion body 31 using the second soft resin 27, even when a strong force is applied to the handle portion body 31, the handle portion 16 is broken (in other words, the handle portion 16 Can be suppressed).
 リング状窪み部32-1,32-2は、ハンドル部本体31の周方向全体に亘って環状に設けられている。リング状窪み部32-1は、第2の部分25-2の配設位置よりもハンドル部16の後端側に配置されている。リング状窪み部32-1は、ハンドル部本体31の直径を縮径することで構成されている。すなわち、リング状窪み部32-1は、X方向と直交する断面形状がハンドル部本体31と相似形で、且つ直径が連続的に小さくなる形状である。
 リング状窪み部32-2は、リング状窪み部32-1の配設位置よりもハンドル部16の後端側に、例えば、20mm~50mm離れて配置されている。リング状窪み部32-2は、ハンドル部本体31の直径を縮径することで構成されている。すなわち、リング状窪み部32-2は、X方向と直交する断面形状がハンドル部本体31と相似形で、且つ直径が連続的に小さくなる形状である。
The ring-shaped depressions 32-1 and 32-2 are provided in an annular shape over the entire circumferential direction of the handle portion main body 31. The ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16 with respect to the arrangement position of the second portion 25-2. The ring-shaped depression 32-1 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-1 has a cross-sectional shape perpendicular to the X direction similar to that of the handle portion main body 31 and a shape in which the diameter continuously decreases.
The ring-shaped depression 32-2 is disposed, for example, 20 mm to 50 mm away from the position where the ring-shaped depression 32-1 is disposed on the rear end side of the handle portion 16. The ring-shaped hollow portion 32-2 is configured by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-2 has a cross-sectional shape perpendicular to the X direction that is similar to that of the handle main body 31, and has a diameter that continuously decreases.
 このように、ハンドル部本体31のX方向に、ハンドル部本体31の直径を縮径することで構成されたリング状窪み部32-1,32-2を配置させることにより、歯ブラシ10を口にくわえた状態で、歯ブラシ10の後端からヘッド部14の先端に向かう方向に強い外力が加えられた際、第2変形部としてのリング状窪み部32-1,32-2の配設位置において、ハンドル部16が容易に折れ曲がることが可能となる。
 これにより、歯ブラシ10の後端からヘッド部14の先端に向かう方向に加えられる外力を、これとは異なる方向にさらに効率良く逃がすことが可能となるので、歯ブラシ10の使用者の口腔内が損傷をさらに抑制することができる。
In this way, by disposing the ring-shaped depressions 32-1 and 32-2 configured by reducing the diameter of the handle portion main body 31 in the X direction of the handle portion main body 31, the toothbrush 10 is placed in the mouth. When a strong external force is applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 in the state of being held, the ring-shaped depressions 32-1 and 32-2 as the second deformation portions are disposed at the positions where they are disposed. The handle portion 16 can be easily bent.
As a result, the external force applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 can be more efficiently released in a direction different from this, so that the oral cavity of the user of the toothbrush 10 is damaged. Can be further suppressed.
 また、ハンドル部本体31のX方向に、ハンドル部本体31の直径を縮径することで構成されたリング状窪み部32-1,32-2を配置させることにより、使用者が歯ブラシ10を使用する際、ハンドル部16を持ちやすくなるため、歯ブラシ10の操作性を向上させることができる。 In addition, the user can use the toothbrush 10 by disposing the ring-shaped depressions 32-1 and 32-2 formed by reducing the diameter of the handle body 31 in the X direction of the handle body 31. When it does, since it becomes easy to have the handle | steering-wheel part 16, the operativity of the toothbrush 10 can be improved.
 なお、図1~図3では、ハンドル部本体31に2つのリング状窪み部32-1,32-2を設けた場合を例に挙げて説明したが、リング状窪み部32-1,32-2の数は、2つに限定されない。リング状窪み部32-1,32-2は、必要に応じて、ハンドル部本体31に1つ以上、5つ以下の個数で設ければよい。
 また、リング状窪み部32-1,32-2の配設位置は、第2の部分25-2の配設位置よりも後方に位置するハンドル部本体31に設ければよく、図1~図3に示すリング状窪み部32-1,32-2の配設位置に限定されない。
1 to 3, the case where two ring-shaped depressions 32-1 and 32-2 are provided in the handle body 31 has been described as an example, but the ring-shaped depressions 32-1 and 32- The number of 2 is not limited to two. One or more ring-shaped depressions 32-1 and 32-2 may be provided on the handle body 31 as needed.
In addition, the disposition positions of the ring-shaped depressions 32-1 and 32-2 may be disposed on the handle portion main body 31 located behind the disposition position of the second portion 25-2. 3 is not limited to the arrangement position of the ring-shaped depressions 32-1 and 32-2.
 第1のリブ部34は、リング状窪み部32-1のうち、ハンドル部本体31の側面(言い換えれば、2つの側面)を構成する部分に複数配置されている。
 第2のリブ部35は、リング状窪み部32-2のうち、ハンドル部本体31の側面(言い換えれば、2つの側面)を構成する部分に複数配置されている。
 第3のリブ部37は、第2のリブ部35の配設位置よりも後端側に位置するハンドル部本体31の側面(言い換えれば、2つの側面)に複数配置されている。
 上記第1ないし第3のリブ部34,35,37は、第2の軟質樹脂27で構成することができる。この場合、第1ないし第3のリブ部34,35,37は、ハンドル部本体31を形成する際に一括形成することができる。
 なお、上記第1ないし第3のリブ部34,35,37は、必ずしも必要ではなく無くてもよい。
A plurality of the first rib portions 34 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-1.
A plurality of the second rib portions 35 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-2.
A plurality of third rib portions 37 are arranged on the side surface (in other words, two side surfaces) of the handle portion main body 31 located on the rear end side with respect to the arrangement position of the second rib portion 35.
The first to third rib portions 34, 35, and 37 can be composed of the second soft resin 27. In this case, the first to third rib portions 34, 35, and 37 can be collectively formed when the handle portion main body 31 is formed.
The first to third rib portions 34, 35, and 37 are not necessarily required.
 このように、リング状窪み部32-1に配置された複数の第1のリブ34、リング状窪み部32-2に配置された複数のリング状窪み部32-2、及び第2のリブ部35の配設位置よりも後端側に位置するハンドル部本体31の側面に配置された複数の第3のリブ部37を有することで、歯ブラシ10を保持する指が滑りにくくなるため、ハンドル部本体31のグリップ性能を向上させることができる。 As described above, the plurality of first ribs 34 disposed in the ring-shaped depression 32-1, the plurality of ring-shaped depressions 32-2 disposed in the ring-shaped depression 32-2, and the second rib section. Since the fingers holding the toothbrush 10 are difficult to slip by having the plurality of third rib portions 37 disposed on the side surface of the handle portion main body 31 located on the rear end side of the arrangement position of the handle portion 35, the handle portion The grip performance of the main body 31 can be improved.
 図1を参照するに、ブラシ部12は、ベース部材21に設けられた複数の植毛穴21-1Bに植設された毛束12-1で構成されている。毛束12-1は、複数の用毛を束ねたものである。
 植毛面21-1bを基準としたときの毛束12-1の長さ(毛丈)は、毛束12-1に求める毛腰等を勘案して決定することができる。具体的には、毛束12-1の長さ(毛丈)は、例えば、6~13mmの範囲内で適宜設定することができる。
Referring to FIG. 1, the brush portion 12 includes a hair bundle 12-1 that is implanted in a plurality of hair implantation holes 21-1 B provided in the base member 21. The hair bundle 12-1 is a bundle of a plurality of hairs.
The length (hair length) of the hair bundle 12-1 with respect to the flocked surface 21-1b can be determined in consideration of the waist and the like required for the hair bundle 12-1. Specifically, the length (hair length) of the hair bundle 12-1 can be appropriately set within a range of 6 to 13 mm, for example.
 毛束12-1は、例えば、毛丈が揃った複数の用毛で構成してもよいし、毛丈の長さの異なる複数の用毛で構成してもよい。
 図1では、歯ブラシ10を構成するブラシ部12の一例として、ブラシ部12を構成する複数の毛束12-1の先端を揃えた場合を例に挙げて図示したが、これに限定されない。
 例えば、ブラシ部12を構成する複数の毛束12-1の長さを異ならせることで、ブラシ部12に段差を設けてもよい。
For example, the hair bundle 12-1 may be composed of a plurality of hairs having the same length, or may be composed of a plurality of hairs having different hair lengths.
In FIG. 1, as an example of the brush portion 12 constituting the toothbrush 10, a case where the tips of the plurality of hair bundles 12-1 constituting the brush portion 12 are aligned is illustrated as an example, but the present invention is not limited thereto.
For example, the brush portion 12 may be provided with a step by making the lengths of the plurality of hair bundles 12-1 constituting the brush portion 12 different.
 毛束12-1の太さ(毛束径)は、毛束12-1に求める毛腰等を勘案して決定することができるが、例えば、1~2mmの範囲内で適宜設定することができる。
 全ての毛束12-1は、同じ毛束径であってもよいし、相互に異なっていてもよい。
The thickness (hair bundle diameter) of the hair bundle 12-1 can be determined in consideration of the hair and the like required for the hair bundle 12-1, but can be appropriately set within a range of 1 to 2 mm, for example. it can.
All the hair bundles 12-1 may have the same hair bundle diameter or may be different from each other.
 毛束12-1を構成する複数の用毛としては、例えば、毛先に向かうにつれて径が小さくなり、毛先が先鋭化された用毛であるテーパー毛や、植毛面21-1bから毛先に向かい径が略同一とされた用毛であるストレート毛等を用いることができる。
 また、ストレート毛としては、例えば、毛先が植毛面21-1bに対して略平行な平面とされたものや、毛先が半球状に丸められたものを用いることができる。
As the plurality of hairs constituting the hair bundle 12-1, for example, a taper hair that is a hair whose diameter decreases toward the hair tip and the hair tip is sharpened, or a hair tip from the hair transplant surface 21-1b. Straight hairs, etc., which are hairs whose diameters are substantially the same facing each other, can be used.
In addition, as the straight hair, for example, a hair whose tip is a plane substantially parallel to the flocked surface 21-1b, or one whose tip is rounded into a hemisphere can be used.
 毛束12-1を構成する用毛の材質は、例えば、6-12ナイロン(6-12NY)、6-10ナイロン(6-10NY)等のポリアミド、PET、PBT、ポリトリメチレンテレフタレート(PTT)、ポリエチレンナフタレート(PEN)、ポリブチレンナフタレート(PBN)等のポリエステル、PP等のポリオレフィン等の樹脂材料を例示することができる。
 用毛の材質となる上記樹脂材料は、1種単独で用いてもよいし、或いは2種以上を組み合わせて用いてもよい。
The material of the hair constituting the hair bundle 12-1 is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT). Examples thereof include resin materials such as polyester such as polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN), and polyolefin such as PP.
The said resin material used as the material of hair may be used individually by 1 type, or may be used in combination of 2 or more type.
 また、毛束12-1を構成する用毛として、例えば、芯部と、該芯部の外側に設けられた少なくとも1層以上の鞘部と、を有する多重芯構造とされたポリエステル製用毛を用いてもよい。
 毛束12-1を構成する用毛の横断面形状は、特に限定されず、例えば、真円形、楕円形等の円形、多角形、星形、三つ葉のクローバー形、四つ葉のクローバー形等を用いることができる。
 ブラシ部12を構成する全ての用毛の断面形状は、同じであってもよいし、異なっていてもよい。
Further, as the hair constituting the hair bundle 12-1, for example, polyester hair having a multi-core structure having a core portion and at least one or more sheaths provided outside the core portion. May be used.
The cross-sectional shape of the hair constituting the hair bundle 12-1 is not particularly limited. For example, a round shape such as a true circle or an ellipse, a polygon, a star, a three-leaf clover shape, a four-leaf clover shape, or the like. Can be used.
The cross-sectional shapes of all the hairs constituting the brush portion 12 may be the same or different.
 毛束12-1を構成する用毛の太さは、該用毛の材質等を勘案して決定することができる。用毛の横断面が円形の場合、該用毛の太さは、例えば、6~9milとすることができる。なお、1milは、0.0254mmである。
 また、毛束12-1は、使用感、刷掃感、清掃効果、耐久性等を考慮して、太さの異なる複数本の用毛を任意に組み合わせることで構成してもよい。
The thickness of the hair constituting the hair bundle 12-1 can be determined in consideration of the material of the hair. When the cross section of the hair is circular, the thickness of the hair can be, for example, 6 to 9 mil. 1 mil is 0.0254 mm.
The hair bundle 12-1 may be configured by arbitrarily combining a plurality of hairs having different thicknesses in consideration of a feeling of use, a feeling of cleaning, a cleaning effect, durability, and the like.
 本実施の形態の歯ブラシによれば、少なくとも先端部が第1の軟質樹脂22で構成され、植毛面21-1bを有するヘッド部14と、第2の軟質樹脂27で構成されたハンドル部本体31を含むハンドル部16と、ヘッド部14とハンドル部16とを接続するネック部15と、を有し、ネック部15は、ネック部15の延在方向(X方向)に延在し、かつ第1の軟質樹脂22よりも硬い硬質樹脂で構成された芯部25と、芯部25を内部に収容し、かつ硬質樹脂よりも軟らかい第2の軟質樹脂27で構成された軟質部26と、を含むことで、使用者が歯ブラシ10を口にくわえた状態で、歯ブラシ10の後端からヘッド部14の先端に向かう方向に強い外力が加えられた際、第2の軟質樹脂27を構成要素とするネック部15及びハンドル部16が変形すること(具体的には、折れ曲がること)で、ヘッド部14の先端に伝わる力を逃がすことが可能となると共に、ヘッド部14の先端に配置された軟らかい第1の軟質樹脂22を使用者の口腔内と接触させることが可能となるので、歯ブラシ10の使用者の口腔内が損傷することを抑制できる。 According to the toothbrush of the present embodiment, at least the tip portion is made of the first soft resin 22, the head portion 14 having the flocked surface 21-1b, and the handle portion main body 31 made of the second soft resin 27. And a neck portion 15 that connects the head portion 14 and the handle portion 16, the neck portion 15 extends in the extending direction (X direction) of the neck portion 15, and A core portion 25 made of a hard resin harder than one soft resin 22, and a soft portion 26 made of a second soft resin 27 that houses the core portion 25 and is softer than the hard resin. Including the second soft resin 27 as a component when a strong external force is applied in a direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 with the user holding the toothbrush 10 in the mouth. Neck 15 and handle Deformation of 16 (specifically, bending) makes it possible to release the force transmitted to the tip of the head portion 14, and the soft first soft resin 22 disposed at the tip of the head portion 14. Since it becomes possible to make it contact with a user's oral cavity, it can suppress that the user's oral cavity of the toothbrush 10 is damaged.
 特に、歯ブラシ10の使用者が1~3才の乳幼児である場合、歯ブラシ10を口にくわえたままの状態で、走ったりする場合があるが、このような場合に乳幼児が転倒した際でも乳幼児の口腔内が損傷することを抑制できる。 In particular, when the user of the toothbrush 10 is an infant of 1 to 3 years old, it may run with the toothbrush 10 held in the mouth. In such a case, even if the infant falls, the infant It is possible to prevent the oral cavity from being damaged.
 なお、本実施の形態では、ベース部材21、芯部25、及び複数の突出部29を有する硬質部材17を歯ブラシ10の構成要素として用いた場合を例に挙げて説明したが、例えば、ベース部材21を構成要素から除いた硬質部材(以下、説明の便宜上、「硬質部材P」という)を用いて歯ブラシ(以下、説明の便宜上、「歯ブラシQ」という)を構成してもよく、この場合、本実施の形態の歯ブラシ10と同様な効果を得ることができる。 In the present embodiment, the case where the hard member 17 having the base member 21, the core portion 25, and the plurality of protruding portions 29 is used as a constituent element of the toothbrush 10 has been described as an example. A toothbrush (hereinafter referred to as “toothbrush Q” for convenience of description) may be configured using a hard member (hereinafter referred to as “hard member P” for convenience of description) in which 21 is excluded from the constituent elements. The same effect as the toothbrush 10 of this Embodiment can be acquired.
 この場合、硬質部材Pは、芯部25の後端側のみに複数の突出部29を有するだけでなく、芯部25の先端側にも複数の突出部29を有するように構成するとよい。
 このような構成とすることで、歯ブラシQの外形に対応した空間を有する金型(図示せず)内に軟質樹脂(第1及び第2の軟質樹脂22,27となる樹脂)を導入したときに、該金型内における硬質部材Pの姿勢(位置)を保つことが可能となるので、精度良く歯ブラシQを製造することができる。
 また、歯ブラシQを製造する際(具体的には、毛束を植毛する際)には、インモールド法を用いるとよい。
In this case, the hard member P may be configured not only to have a plurality of protruding portions 29 only on the rear end side of the core portion 25 but also to have a plurality of protruding portions 29 also on the front end side of the core portion 25.
By adopting such a configuration, when a soft resin (resin that becomes the first and second soft resins 22 and 27) is introduced into a mold (not shown) having a space corresponding to the outer shape of the toothbrush Q. In addition, since the posture (position) of the hard member P in the mold can be maintained, the toothbrush Q can be manufactured with high accuracy.
Further, when the toothbrush Q is manufactured (specifically, when a hair bundle is implanted), an in-mold method may be used.
 図11は、本実施の形態の歯ブラシの製造工程を示す断面図であり、第1の金型を用いて硬質部材を形成する工程を説明するための図である。図12は、本実施の形態の歯ブラシの製造工程を示す断面図であり、第2の金型を用いて、第1の軟質樹脂、軟質部、及びハンドル部本体を形成する工程を説明するための図である。
 図11及び図12において、図1~図10に示す構造体と同一構成部分には、同一符号を付す。また、図11に示す矢印は、硬質樹脂が導入される方向を示しており、図12に示す矢印は、軟質樹脂(後述する軟質樹脂N)が導入される方向を示している。
FIG. 11 is a cross-sectional view showing a manufacturing process of the toothbrush of the present embodiment, and is a diagram for explaining a process of forming a hard member using a first mold. FIG. 12 is a cross-sectional view illustrating a manufacturing process of the toothbrush of the present embodiment, and illustrates a process of forming the first soft resin, the soft part, and the handle part main body using the second mold. FIG.
11 and 12, the same components as those shown in FIGS. 1 to 10 are denoted by the same reference numerals. Moreover, the arrow shown in FIG. 11 has shown the direction in which hard resin is introduced, and the arrow shown in FIG. 12 has shown the direction in which soft resin (soft resin N mentioned later) is introduced.
 次に、主に、図1、図11、及び図12を参照して、本実施の形態の歯ブラシ10の製造方法について説明する。
 なお、ここでは、第1及び第2の軟質樹脂22,27として同じ種類の軟質樹脂(以下、説明の便宜上、「軟質樹脂N」という)を用いた場合を例に挙げて、以下の説明を行う。
Next, a method for manufacturing the toothbrush 10 of the present embodiment will be described mainly with reference to FIGS. 1, 11, and 12.
Here, the following explanation is given by taking as an example the case where the same kind of soft resin (hereinafter referred to as “soft resin N” for convenience of explanation) is used as the first and second soft resins 22 and 27. Do.
 始めに、図11に示す工程では、一対の金型41-1,41-2よりなり、内部に硬質部材17の形状に対応した空間43、及び空間43内に硬質樹脂を導入するための導入口45を有する第1の金型41を準備する。
 金型41-2には、複数の植毛穴21-1Bを形成するための突出部(図示せず)が形成されている。また、導入口45は、空間43の後端側に配置されている。
First, in the process shown in FIG. 11, a space 43 corresponding to the shape of the hard member 17 and an introduction for introducing a hard resin into the space 43 are formed by a pair of molds 41-1 and 41-2. A first mold 41 having a mouth 45 is prepared.
The mold 41-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. Further, the introduction port 45 is disposed on the rear end side of the space 43.
 次いで、導入口45を介して、硬質部材17の母材となる溶融された硬質樹脂(曲げ弾性率(JIS K7203)が500~3000MPaの範囲内にある樹脂)で空間43を充填し、該硬質樹脂が硬化することで、複数の植毛穴21-1B及び支持部21-2を含むベース部材21、芯部25、及び複数の突出部29が一体とされた硬質部材17が形成される。その後、第1の金型41から硬質部材17を取り出す。 Next, the space 43 is filled with a molten hard resin (a resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa) serving as a base material of the hard member 17 through the introduction port 45. By hardening the resin, the hard member 17 is formed in which the base member 21 including the plurality of flock holes 21-1B and the support portion 21-2, the core portion 25, and the plurality of protrusions 29 are integrated. Thereafter, the hard member 17 is taken out from the first mold 41.
 次いで、図12に示す工程では、一対の金型51-1,51-2よりなり、図1に示すブラシ部12を除いた歯ブラシ10の形状に対応した空間53、及び空間53内に硬質樹脂を導入するための導入口55を有する第2の金型55を準備する。一対の金型51-1,51-2の接合面は、例えば、図8~図10に示される軟質部26(ハンドル部本体31)のZ方向の中間位置に設定されている。
 金型51-2には、複数の植毛穴21-1Bを形成するための突出部(図示せず)が形成されている。また、導入口55は、空間53の後端側に配置されている。
 また、第2の金型51には、図1に示すリング状窪み部32-1,32-2、第1のリブ部34、第2のリブ部35、及び第3のリブ部37を形成するための突出部が設けられている。
Next, in the process shown in FIG. 12, a space 53 corresponding to the shape of the toothbrush 10 excluding the brush portion 12 shown in FIG. A second mold 55 having an introduction port 55 for introducing is prepared. The joint surfaces of the pair of molds 51-1 and 51-2 are set at an intermediate position in the Z direction of the soft portion 26 (handle portion main body 31) shown in FIGS. 8 to 10, for example.
The mold 51-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. The introduction port 55 is disposed on the rear end side of the space 53.
In addition, the second mold 51 is formed with the ring-shaped depressions 32-1 and 32-2, the first rib 34, the second rib 35, and the third rib 37 shown in FIG. Protrusions are provided for doing so.
 次いで、上記第2の金型51の空間53の先端部に、硬質部材17を配置させる。このとき、複数の植毛穴21-1Bが覆われるように、金型51-2の内面と植毛面21-1bとを接触させると共に、2つの支持部21-2の端面と金型51-1の内面とを接触させ、さらに、複数(本実施の形態の場合、4つ)の突出部29の突出面29aと第2の金型51の内面とを接触させる。 Next, the hard member 17 is disposed at the tip of the space 53 of the second mold 51. At this time, the inner surface of the mold 51-2 and the flocked surface 21-1b are brought into contact with each other so that the plurality of flocked holes 21-1B are covered, and the end surfaces of the two support portions 21-2 and the mold 51-1. Further, the plurality of (in the case of this embodiment, four) projecting surfaces 29a of the projecting portions 29 and the inner surface of the second mold 51 are brought into contact with each other.
 これにより、第2の金型51の空間53内に、第1の軟質樹脂22、及び第2の軟質樹脂27(軟質部26及びハンドル部本体31を構成する軟質樹脂)となる軟質樹脂Nが導入された際、第2の金型51内における硬質部材17の位置及び姿勢を維持することができる。 Thereby, in the space 53 of the 2nd metal mold | die 51, the soft resin N used as the 1st soft resin 22 and the 2nd soft resin 27 (the soft resin which comprises the soft part 26 and the handle | steering-wheel main body 31) is carried out. When introduced, the position and posture of the hard member 17 in the second mold 51 can be maintained.
 すなわち、+Z側に位置する突出部29の突出面29aが金型51-2の内面と接触し、-Z側に位置する突出部29の突出面29aが金型51-1の内面と接触することにより、硬質部材17がZ方向で位置決めされる。また、+Z側に位置する突出部29および-Z側に位置する突出部29の突出面29aは、双方が+Y側および-Y側に臨んでいることから、金型51-1、金型51-2の内面に接触することにより、Y方向についても位置決めされる。
 また、2つの支持部21-2の端面、及び複数の突出部29の突出面29aが第2の金型51の内面と接触することで、硬質部材17と第2の金型51との間に、第1の軟質樹脂22、及び軟質部26を形成するための隙間を確保することができる。
That is, the protruding surface 29a of the protruding portion 29 located on the + Z side contacts the inner surface of the mold 51-2, and the protruding surface 29a of the protruding portion 29 positioned on the −Z side contacts the inner surface of the mold 51-1. Thus, the hard member 17 is positioned in the Z direction. Further, since both the protruding portion 29 positioned on the + Z side and the protruding surface 29a of the protruding portion 29 positioned on the −Z side face the + Y side and the −Y side, the mold 51-1 and the mold 51 -2 is also positioned in the Y direction by contacting the inner surface.
Further, the end surfaces of the two supporting portions 21-2 and the protruding surfaces 29 a of the plurality of protruding portions 29 come into contact with the inner surface of the second mold 51, so that the space between the hard member 17 and the second mold 51 is reduced. In addition, a gap for forming the first soft resin 22 and the soft portion 26 can be secured.
 次いで、導入口55を介して、空間53内に、溶融させた軟質樹脂N(JIS K 7215 ショアAの硬度が90以下の樹脂)を充填させる。
 先細り部31Aに対応する位置における金型51-1、金型51-2の内面は、先端側に向かうに従って先細るように互いの距離が短くなるため、当該内面に突出面29aが接触することにより、硬質部材17は、先端側への移動を阻止される。そのため、硬質部材17は、導入口55を介して充填された溶融させた軟質樹脂Nの樹脂圧が加わってもX方向に移動することなく位置決めされる。
 その後、軟質樹脂Nを硬化させることで、第1の軟質樹脂22、軟質部26、及びハンドル部本体31を形成する。金型51-1、金型51-2の接合面と対向する位置(Z方向で略中間位置)における軟質部26の表面には、微小突条のパーティングラインが形成される。
 これにより、ヘッド部14、ネック部15、及びハンドル部16を有するハンドル体11が形成される。その後、第2の金型51内からハンドル体11を取り出す。
Next, the melted soft resin N (resin having a hardness of JIS K 7215 Shore A of 90 or less) is filled into the space 53 through the introduction port 55.
Since the inner surfaces of the mold 51-1 and the mold 51-2 at the position corresponding to the tapered portion 31A are shortened so as to taper toward the front end side, the projecting surface 29a is in contact with the inner surface. Thus, the hard member 17 is prevented from moving toward the tip side. Therefore, the hard member 17 is positioned without moving in the X direction even when the resin pressure of the molten soft resin N filled through the introduction port 55 is applied.
Thereafter, the first soft resin 22, the soft portion 26, and the handle portion main body 31 are formed by curing the soft resin N. Parting lines of minute protrusions are formed on the surface of the soft portion 26 at a position facing the joint surfaces of the mold 51-1 and the mold 51-2 (substantially intermediate position in the Z direction).
As a result, the handle body 11 having the head portion 14, the neck portion 15, and the handle portion 16 is formed. Thereafter, the handle body 11 is taken out from the second mold 51.
 次いで、図1に示すように、ヘッド部11の複数の植毛穴21-2に対して、毛束12-1を植設する。これにより、図1に示す本実施の歯ブラシ10が製造される。
 毛束12の植毛方法としては、例えば、毛束12-1を2つ折りにした後、毛束12-1の内側に平線(金属製(例えば、真鍮)の厚さの薄い板)を挟み込み、平線が挟み込まれた毛束12-1を植毛穴21-2に植設する平線植毛法を用いることができる。
Next, as shown in FIG. 1, the hair bundle 12-1 is implanted into the plurality of flocking holes 21-2 of the head portion 11. Thereby, the toothbrush 10 of this embodiment shown in FIG. 1 is manufactured.
For example, after the hair bundle 12-1 is folded in half, a flat wire (a thin plate made of metal (for example, brass)) is inserted inside the hair bundle 12-1. The flat wire flocking method of planting the hair bundle 12-1 with the flat wire sandwiched in the flock hole 21-2 can be used.
 なお、本実施の形態では、毛束12-1の植毛方法として、平線植毛法を用いた場合を例に挙げて説明したが、この方法に替えて、例えば、ヘッド部14を構成する樹脂(軟質樹脂または硬質樹脂)の中へ毛束12-1の下端を圧入して固定する熱融着法や、毛束12-1の下端を加熱して溶融塊を形成した後、金型内に溶融樹脂を導入させるインモールド法等を用いてもよい。 In the present embodiment, the case of using the flat wire flocking method has been described as an example of the flocking method of the hair bundle 12-1. However, instead of this method, for example, the resin constituting the head unit 14 is used. After the lower end of the hair bundle 12-1 is pressed and fixed into (soft resin or hard resin), or after the lower end of the hair bundle 12-1 is heated to form a molten mass, An in-mold method or the like in which a molten resin is introduced into the substrate may be used.
 以上、本発明の好ましい実施の形態について詳述したが、本発明はかかる特定の実施の形態に限定されるものではなく、特許請求の範囲内に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.
 例えば、上記実施形態では、ヘッド部14の先端部に軟質部26を設ける構成を例示したが、これに限定されるものではなく、図13の側面図および図14の正面図に示すように、ネック部15における変形部15Aを含み、且つ変形部15Aから後端側に軟質部26を設ける構成であってもよい。
 また、歯ブラシとしては、毛束が一つの、所謂ワンタフト歯ブラシや、舌苔助除去部を有する歯ブラシ等に本発明は広く適用可能である。
For example, in the above-described embodiment, the configuration in which the soft portion 26 is provided at the tip portion of the head portion 14 is illustrated, but is not limited thereto, as shown in the side view of FIG. 13 and the front view of FIG. A configuration in which the deformable portion 15A in the neck portion 15 is included and the soft portion 26 is provided on the rear end side from the deformable portion 15A may be employed.
Further, as the toothbrush, the present invention can be widely applied to a so-called one-tuft toothbrush having a single hair bundle, a toothbrush having a tongue coating auxiliary removing portion, and the like.
 また、上記実施の形態では、植毛面21-1bとハンドル部16との間に、上記第2の方向(Y方向)の幅が、ヘッド部14の幅(Y方向の最大幅)よりも小さいネック部15が配置される歯ブラシ10について説明したが、この構成に限定されるものではなく、例えば、植毛面21-1bとハンドル部16との間に、Y方向の幅が、ヘッド部14の最大幅と同一の箇所が存在する場合の歯ブラシについても、本発明に含まれる。この場合、当該箇所がネック部として、変形部が配置されるとともに、この変形部から後端側に硬質部材の少なくとも一部を内部に収容し、且つ、軟質樹脂で形成された軟質部が配置される。 In the above embodiment, the width in the second direction (Y direction) is smaller than the width of the head portion 14 (maximum width in the Y direction) between the flocked surface 21-1b and the handle portion 16. Although the toothbrush 10 in which the neck portion 15 is disposed has been described, the present invention is not limited to this configuration. For example, the width in the Y direction between the flocked surface 21-1b and the handle portion 16 is A toothbrush in the case where the same portion as the maximum width exists is also included in the present invention. In this case, the deformed portion is disposed as the neck portion, and at least a part of the hard member is accommodated in the rear end side from the deformed portion, and the soft portion formed of the soft resin is disposed. Is done.
 本発明は、使用者の口腔の損傷を抑制可能な歯ブラシに利用可能である。 The present invention can be used for a toothbrush capable of suppressing damage to a user's oral cavity.
 10…歯ブラシ、11…ハンドル体、12…ブラシ部、14…ヘッド部、15…ネック部、15A…変形部、16…ハンドル部、17…硬質部材、21…ベース部材、21-1…ベース部材本体、21-1a…底面、21-1A…先端部、21-1b…植毛面(第1露出部)、21-1B…植毛穴、21-2…支持部、21-2a…突出面、22…第1の軟質樹脂、25…芯部、25-1…第 1の部分、25-1a…切断面、25-2…第1の部分、26…軟質部、27…第2の軟質樹脂、29…突出部、29a…突出面、31…ハンドル部本体、31A…先細り部、32-1,32-2…リング状窪み部(第2変形部)、34…第1のリブ部、35…第2のリブ部、37…第3のリブ部、41…第1の金型、41-1,41-2,51-1,51-2…金型、43,53…空間、45,55…導入口、51…第2の金型、R1,R2…直径、S1,S2…面積、T1…突出量、W1…第1の幅、W2…第2の幅 DESCRIPTION OF SYMBOLS 10 ... Toothbrush, 11 ... Handle body, 12 ... Brush part, 14 ... Head part, 15 ... Neck part, 15A ... Deformation part, 16 ... Handle part, 17 ... Hard member, 21 ... Base member, 21-1 ... Base member Main body, 21-1a ... bottom surface, 21-1A ... tip, 21-1b ... planted surface (first exposed portion), 21-1B ... planted hole, 21-2 ... supporting portion, 21-2a ... projecting surface, 22 ... first soft resin, 25 ... core, 25-1 ... first part, 25-1a ... cut surface, 25-2 ... first part, 26 ... soft part, 27 ... second soft resin, 29 ... Projection, 29a ... Projection surface, 31 ... Handle body, 31A ... Taper, 32-1, 32-2 ... Ring-shaped depression (second deformation part), 34 ... First rib, 35 ... 2nd rib part, 37 ... 3rd rib part, 41 ... 1st metal mold | die, 41-1, 41-2, 51 1, 51-2 ... mold, 43, 53 ... space, 45, 55 ... introduction port, 51 ... second mold, R1, R2 ... diameter, S1, S2 ... area, T1 ... protrusion amount, W1 ... first 1 width, W2 ... second width

Claims (14)

  1.  先端側に植毛面を有するヘッド部と、
     前記ヘッド部より後端側に配置され、ハンドル部本体を含むハンドル部と、
     を有し、
     前記植毛面と前記ハンドル部との間に配置され、前記ヘッド部への外力で変形する変形部と、
     前記ヘッド部から前記ハンドル部の先端側の一部に亘って配置され硬質樹脂で形成された硬質部材と、
     前記変形部から後端側に配置され前記硬質部材の少なくとも一部を内部に収容し、且つ、軟質樹脂で形成された軟質部と、
     を含むことを特徴とする歯ブラシ。
    A head portion having a flocked surface on the tip side;
    A handle portion disposed on the rear end side from the head portion and including a handle portion body;
    Have
    A deforming portion that is disposed between the flocked surface and the handle portion and is deformed by an external force applied to the head portion;
    A hard member formed from a hard resin and disposed over a part of the front end side of the handle portion from the head portion;
    A soft portion that is arranged on the rear end side from the deformable portion and accommodates at least a part of the hard member therein, and is formed of a soft resin;
    A toothbrush characterized by including.
  2.  前記ハンドル部に配置され、前記外力で変形する第2変形部を有することを特徴とする請求項1記載の歯ブラシ。 The toothbrush according to claim 1, further comprising a second deforming portion disposed on the handle portion and deformed by the external force.
  3. (旧請求項3の内容と第2変形部)
     前記ハンドル部は、該ハンドル部の延在方向に対して、少なくとも1つの縮径されたリング状の窪み部を有し、
     前記第2変形部は、前記窪み部の配設位置に配置されることを特徴とする請求項2記載の歯ブラシ。
    (Content of old claim 3 and second modified part)
    The handle portion has at least one ring-shaped depression having a reduced diameter with respect to the extending direction of the handle portion,
    The toothbrush according to claim 2, wherein the second deforming portion is disposed at a position where the hollow portion is disposed.
  4.  前記硬質部材は、前記ヘッド部において前記植毛面側に露出する第1露出部と、前記植毛面とは逆側に露出する第2露出部とを有することを特徴とする請求項1ないし3のうち、いずれか1項記載の歯ブラシ。 The said hard member has the 1st exposed part exposed to the said flocked surface side in the said head part, and the 2nd exposed part exposed to the said flocking surface side, The Claim 1 thru | or 3 characterized by the above-mentioned. Of these, the toothbrush according to any one of the above.
  5.  前記硬質部材は、前記ハンドル部において前記植毛面側に突出して露出する柱状の第1突出部と、前記ハンドル部において前記植毛面とは逆側に突出して露出する柱状の第2突出部とを有することを特徴とする請求項1ないし4のうち、いずれか1項記載の歯ブラシ。 The hard member includes a columnar first projecting portion that protrudes and is exposed to the flocked surface side in the handle portion, and a columnar second projecting portion that projects and is exposed to the side opposite to the flocked surface in the handle portion. The toothbrush according to claim 1, wherein the toothbrush is provided.
  6.  前記第1突出部は、前記軟質部の前記植毛面側に形成された第1開口部を介して露出し、
     前記第2突出部は、前記軟質部の前記植毛面側とは逆側に形成された第2開口部を介して露出することを特徴とする請求項5記載の歯ブラシ。
    The first protrusion is exposed through a first opening formed on the flocked surface side of the soft part,
    The toothbrush according to claim 5, wherein the second protrusion is exposed through a second opening formed on a side opposite to the flocked surface side of the soft part.
  7.  前記ハンドル部における前記軟質部は、前記先端側に向けて先細る先細り部を有し、
     前記第1開口部および前記第2開口部は、前記先細り部に形成されていることを特徴とする請求項6記載の歯ブラシ。
    The soft portion in the handle portion has a tapered portion that tapers toward the distal end side,
    The toothbrush according to claim 6, wherein the first opening and the second opening are formed in the tapered portion.
  8.  前記軟質部は、表面にパーティングラインを有し、
     前記第1突出部は、前記パーティングラインを挟んで前記植毛面と直交する方向の一方側に露出し、
     前記第2突出部は、前記パーティングラインを挟んで前記直交する方向の他方側に露出することを特徴とする請求項5ないし7のうち、いずれか1項記載の歯ブラシ。
    The soft part has a parting line on the surface,
    The first protrusion is exposed on one side in a direction perpendicular to the flocked surface across the parting line,
    The toothbrush according to any one of claims 5 to 7, wherein the second protrusion is exposed on the other side in the orthogonal direction across the parting line.
  9. (旧請求項5の内容)
     前記硬質部材は、前記ハンドル部まで延在するように配置されており、
     前記第1突出部の先端面および前記第2突出部の先端面は、前記ハンドル部の外面に対して面一であることを特徴とする請求項5ないし8のうち、いずれか1項記載の歯ブラシ。
    (Content of old claim 5)
    The hard member is arranged to extend to the handle part,
    The front end surface of the first projecting portion and the front end surface of the second projecting portion are flush with the outer surface of the handle portion, according to any one of claims 5 to 8. toothbrush.
  10. (旧請求項6の内容)
     前記硬質部材のうち、前記第1突出部および前記第2突出部よりも前記ハンドル部の後端側に配置された部分は、前記ハンドル部の後端側に向かうにつれて、径が小さくなる形状であることを特徴とする請求項5ないし9のうち、いずれか1項記載の歯ブラシ。
    (Content of old claim 6)
    Of the hard member, the portion disposed on the rear end side of the handle portion with respect to the first projecting portion and the second projecting portion has a shape that decreases in diameter toward the rear end side of the handle portion. The toothbrush according to claim 5, wherein the toothbrush is provided.
  11. (旧請求項1の一部)
     前記ヘッド部は、少なくとも先端部が前記硬質樹脂よりも軟らかい第1の軟質樹脂で構成され、
     前記ハンドル部本体は、前記硬質樹脂よりも軟らかい第2の軟質樹脂で構成され、
     前記軟質部は、前記第2の軟質樹脂で構成されることを特徴とする請求項1ないし10のうち、いずれか1項記載の歯ブラシ。
    (Part of the old claim 1)
    The head portion is composed of a first soft resin whose at least a tip portion is softer than the hard resin,
    The handle body is composed of a second soft resin that is softer than the hard resin,
    The toothbrush according to any one of claims 1 to 10, wherein the soft part is made of the second soft resin.
  12. (旧請求項2の内容)
     前記植毛面と前記ハンドル部との間における前記硬質部材は、前記植毛面に対して直交する第1の方向における第1の幅が、前記ハンドル部の長さ方向と前記第1の方向とに対して直交する第2の方向における第2の幅よりも大きいことを特徴とする請求項1ないし11のうち、いずれか1項記載の歯ブラシ。
    (Content of old claim 2)
    The hard member between the flocked surface and the handle portion has a first width in a first direction orthogonal to the flocked surface so that the length direction of the handle portion and the first direction are The toothbrush according to any one of claims 1 to 11, wherein the toothbrush is larger than a second width in a second direction orthogonal to the second direction.
  13. (旧請求項4の内容)
     前記ヘッド部における前記硬質部材は、前記植毛面、及び複数の植毛穴を有するベース部材を含み、
     前記第1の軟質樹脂は、前記植毛面、及び前記複数の植毛穴を露出させた状態で、前記ベース部材の一部を覆うように配置されることを特徴とする請求項1ないし12のうち、いずれか1項記載の歯ブラシ。
    (Content of old claim 4)
    The hard member in the head portion includes a base member having the flocked surface and a plurality of flocked holes,
    The first soft resin is disposed so as to cover a part of the base member in a state where the flocked surface and the plurality of flocked holes are exposed. A toothbrush according to any one of the above.
  14.  前記植毛面と前記ハンドル部との間に、前記植毛面と直交する第1の方向と前記ハンドル部の長さ方向とに直交する第2の方向の幅が、前記ヘッド部の幅以下のネック部が配置されることを特徴とする請求項1ないし13のうち、いずれか1項記載の歯ブラシ。 A neck having a width between a first direction perpendicular to the flocked surface and a second direction perpendicular to the length direction of the handle portion between the flocked surface and the handle portion is equal to or less than the width of the head portion. The toothbrush according to any one of claims 1 to 13, wherein a portion is arranged.
PCT/JP2015/074289 2014-09-01 2015-08-27 Toothbrush WO2016035678A1 (en)

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KR1020167036429A KR102577531B1 (en) 2014-09-01 2015-08-27 Toothbrush
CN202010310829.7A CN111480969B (en) 2014-09-01 2015-08-27 Tooth brush
CN202010310832.9A CN111493506B (en) 2014-09-01 2015-08-27 Toothbrush with tooth brush
CN202010310721.8A CN111449408B (en) 2014-09-01 2015-08-27 Toothbrush with tooth brush
CN201580046958.7A CN106659289A (en) 2014-09-01 2015-08-27 Toothbrush
JP2016546601A JP6591988B2 (en) 2014-09-01 2015-08-27 toothbrush

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