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WO2018110299A1 - Brosse à dents et son procédé de fabrication - Google Patents

Brosse à dents et son procédé de fabrication Download PDF

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Publication number
WO2018110299A1
WO2018110299A1 PCT/JP2017/043102 JP2017043102W WO2018110299A1 WO 2018110299 A1 WO2018110299 A1 WO 2018110299A1 JP 2017043102 W JP2017043102 W JP 2017043102W WO 2018110299 A1 WO2018110299 A1 WO 2018110299A1
Authority
WO
WIPO (PCT)
Prior art keywords
toothbrush
soft
gripping pieces
end side
gripping
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2017/043102
Other languages
English (en)
Japanese (ja)
Inventor
良輔 高井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lion Corp
Original Assignee
Lion Corp
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
Priority claimed from JP2016240154A external-priority patent/JP6842905B2/ja
Priority claimed from JP2016240153A external-priority patent/JP6842904B2/ja
Application filed by Lion Corp filed Critical Lion Corp
Publication of WO2018110299A1 publication Critical patent/WO2018110299A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies

Definitions

  • the present invention relates to a toothbrush and a method for manufacturing a toothbrush.
  • This application claims priority based on Japanese Patent Application No. 2016-240153 filed in Japan on December 12, 2016 and Japanese Patent Application No. 2016-240154 filed on Japan on December 12, 2016, The contents are incorporated here.
  • a toothbrush in which a soft material having excellent gripping force is covered with a soft material excellent in gripping force or a whole periphery of a handle portion so as to prevent the finger from slipping (see, for example, Patent Document 1). Further, in Patent Document 2, in a two-color molded handle made of a soft resin and a hard resin, a soft material is provided at the core of the grip portion, and the periphery thereof is made of a hard resin and extends from the neck portion to the rear end side.
  • the toothbrush handle part which improved the fit by connecting with a support
  • the toothbrush described in Patent Document 1 uses a hard material for the core, has low followability to the hand, and has not achieved a sufficient fit.
  • the soft material for example, A hardness of 30 or more
  • the soft material itself used for the existing toothbrush handle part itself is poor in flexibility and hardly deformed, so that the fit is insufficient.
  • the struts of the hard part are connected at two positions on the rear end side from the neck part, and the region where the soft resin is deformed when grasped is limited. Therefore, in the toothbrush described in Patent Document 2, the entire handle is difficult to deform and a good fit cannot be obtained.
  • the handle portion is made of only a soft material with ultra-low hardness (for example, A hardness is less than 30).
  • a hardness is less than 30.
  • the handle portion can be secured, however, the handle portion loses rigidity, and at the time of brushing. Since the applied force is not transmitted to the teeth, it is difficult to brush the teeth and the cleaning power is reduced.
  • the soft resin having an extremely low hardness often causes stickiness due to bloom / bleed out due to change over time, which causes a problem in feeling of use (tactile sensation).
  • the present invention has been made in consideration of the above points, and an object of the present invention is to provide a toothbrush and a method of manufacturing a toothbrush that can obtain a high fit while ensuring a good cleaning power and a feeling of use.
  • the head portion having a flocked surface on the front end side in the length direction, the handle portion disposed on the rear end side from the head portion, the flocked surface and the handle portion.
  • a plurality of grip pieces extending from the boundary with the neck portion and extending to the rear end side, and a long shape made of a soft resin.
  • a toothbrush is provided in which an end portion on an end side is provided separately from the other gripping pieces.
  • the plurality of grip pieces are provided such that end portions on the rear end side are provided separately from each other.
  • the plurality of gripping pieces are arranged at positions that do not overlap each other in a direction orthogonal to the flocked surface.
  • the toothbrush according to one aspect of the present invention is characterized in that the toothbrush includes an axial portion extending in a direction orthogonal to the flocked surface from the grip piece.
  • the tip of the shaft-like portion is disposed flush with the outer peripheral surface of the soft portion or at a position recessed from the outer peripheral surface of the soft portion.
  • the toothbrush according to one aspect of the present invention three or more and five or less gripping pieces are arranged.
  • the said holding piece is arrange
  • the soft portion is formed integrally with the gripping piece.
  • the soft portion is fixed to the grip piece with an adhesive.
  • the head portion having a flocked surface on the front end side in the length direction, the handle portion disposed on the rear end side from the head portion, the flocked surface and the handle portion.
  • the handle portion is formed of a hard resin, is branched from a boundary with the neck portion and extends to the rear end side, and is formed of a soft resin.
  • a plurality of gripping pieces extending in a long shape from the boundary with the neck portion to the rear end side, and having a plurality of gripping pieces arranged around the outside in a cross section orthogonal to the length direction.
  • the through hole has one end opening to face the said gripping pieces and the other end toothbrush is characterized in that an opening is exposed to the outside is provided.
  • a plurality of the through holes are arranged at positions facing each of the plurality of gripping pieces.
  • a plurality of the through holes are arranged along the gripping piece for each of the plurality of gripping pieces.
  • the through holes are arranged in a number of 3 or more and 10 or less for each of the plurality of gripping pieces.
  • the toothbrush which concerns on 1 aspect of the said invention WHEREIN:
  • the said through-hole exposes and opens the 1st through-hole exposed to one side of the direction orthogonal to the said flocked surface, and the 2nd exposed and opened to the other side. Including a through hole.
  • the plurality of grip pieces are provided such that end portions on the rear end side are provided separately from each other.
  • the toothbrush according to one aspect of the present invention three or more and five or less gripping pieces are arranged.
  • the said holding piece is arrange
  • the outer contour of the soft part is disposed inside a circle circumscribing the plurality of gripping pieces.
  • the head portion having a flocked surface on the front end side in the length direction, the handle portion disposed on the rear end side from the head portion, the flocked surface and the handle portion.
  • one end of the soft portion is opened by the holding portion so as to face the grip piece, and the other end is exposed to the outside.
  • a through hole that is open is formed.
  • FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is sectional drawing of the 1st metal mold
  • FIGS. 1 to 5 show one aspect of the present invention and do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each configuration easy to understand, the actual structure is different from the scale and number of each structure.
  • FIG. 1 is a plan view of the toothbrush 1 according to the first embodiment
  • FIG. 2 is a side view of the toothbrush 1.
  • the toothbrush 1 in FIG. 1 includes a head portion 2 having a substantially square shape in plan view disposed on the front end side in the length direction, a neck portion 4 extending from the head portion 2 to the rear end side, and a neck portion 4
  • a substantially elongated handle body 10 having a handle portion 6 extending on the rear end side and a flocked portion (not shown) provided on the head portion 2 are provided.
  • the head portion 2 is formed in a substantially rectangular flat plate shape in which the length direction of the handle body 10 is long and the top portion on the neck portion 4 side is cut off with a curve in plan view, and the flocked surface which is the upper surface in FIG. In FIG. 20, a plurality of flock holes 22 are formed.
  • a hair bundle (not shown) in which the bristles are bundled is planted in the tuft hole 22 to form a tuft portion including a plurality of tufts.
  • the length direction of the handle body 10 is the X direction
  • the width direction parallel to the flocked surface 20 and perpendicular to the length direction of the handle body 10 is the Y direction
  • the thickness is perpendicular to the flocked surface 20.
  • the vertical direction is referred to as the Z direction.
  • the side on which the flocked surface 20 faces is referred to as the front surface
  • the side opposite to the side on which the flocked surface 20 faces is referred to as the back surface.
  • the size of the head portion 2 can be determined in consideration of the operability in the oral cavity. If the width of the head portion 2 is too large, the operability in the oral cavity will be reduced, and if it is too small, the number of hair bundles to be implanted will be too small, and the cleaning effect will be easily impaired. For this reason, the width of the head portion 2 is, for example, 5 to 13 mm.
  • the thickness of the head portion 2 can be determined in consideration of the material of the handle body 10 and the like, and is preferably 1.5 to 5 mm, and more preferably 2 to 3 mm. If the length of the head part 2 is too long, the operability in the oral cavity is liable to be impaired, and if it is too short, the number of hair bundles to be implanted becomes too small and the cleaning effect is liable to be impaired. For this reason, the length of the head portion 2 is appropriately determined in the range of 10 to 26 mm.
  • the shape of the flock hole 22 is not particularly limited, and examples thereof include a circle such as a perfect circle or an ellipse, and a polygon such as a triangle and a rectangle.
  • the number of flock holes 22 is not particularly limited, and is 10 to 60, for example.
  • the diameter of the flock hole 22 is determined according to the desired thickness of the hair bundle 23, and is set to 1 to 3 mm, for example.
  • the arrangement pattern of the flock holes 22 is not particularly limited, and may be any arrangement pattern such as a so-called grid pattern or zigzag pattern.
  • the bristles constituting the hair bundle 23 are bristles (taper hairs) whose diameter gradually decreases toward the bristles, and bristles (straight bristles) having substantially the same outer diameter except for the rounded portion of the bristles.
  • the material of the hair is, for example, polyamide such as 6-12 nylon and 6-10 nylon, polyester such as PET, PBT, polytrimethylene terephthalate (PTT), PEN, polybutylene naphthalate (PBN), and polyolefin such as PP.
  • Synthetic resin materials such as olefin elastomers and styrene elastomers can be used. These resin materials may be used individually by 1 type, and may be used in combination of 2 or more type.
  • the bristle may have a multi-core structure having a core part and at least one or more sheath parts provided outside the core part.
  • the cross-sectional contour of the hair is not particularly limited, and is, for example, a circle such as a perfect circle or an ellipse, a polygon such as a triangle, a rectangle, a pentagon, or a hexagon, a star, a three-leaf clover, or a four-leaf clover. Etc.
  • the hair bundle may be composed of all the hairs having the same thickness, or two or more hairs having different thicknesses may be combined.
  • the hair length is preferably 8 mm to 15 mm for adults and 6 mm to 12 mm for children, for example.
  • a plurality of hairs having different thicknesses may be used in combination depending on purposes such as a feeling of use, a feeling of cleaning, a cleaning effect, and durability.
  • the neck portion 4 connects the head portion 2 and the handle portion 6.
  • the neck portion 4 extends from the front end boundary with the head portion 2 to the handle portion 6 with substantially the same diameter, and then expands to reach the rear end side boundary with the handle portion 6.
  • the rear end side boundary is, for example, the end point of the diameter expansion of the neck portion 4 (that is, the end point of the straight line that forms both edges of the widened portion or the bending direction of the curve that forms both edges of the widened portion in plan view) Is a position (inflection point)).
  • the width of the neck portion 4 is preferably 3.0 to 4.5 mm, and more preferably 3.0 to 4.2 mm.
  • the width of the neck portion 4 is equal to or greater than the lower limit value, it is easy to suppress the strength of the neck portion 4 from being lowered, and the durability of the toothbrush 1 is enhanced. Furthermore, the toothbrush 1 does not become too soft, and a good feeling of use is easily obtained.
  • the operativity in the oral cavity of the toothbrush 1 is improved as the width
  • the width of the neck portion 4 is not constant, the width of the neck portion 4 means the minimum width of the neck portion 4.
  • the thickness of the neck portion 4 is preferably 3.0 to 4.5 mm, and more preferably 3.0 to 4.2 mm.
  • the thickness is equal to or more than the lower limit value, it is easy to suppress the strength of the neck portion 4 from being lowered, and the durability of the toothbrush 1 is enhanced. Furthermore, the toothbrush 1 does not become too soft, and a good feeling of use is easily obtained.
  • the operativity in the oral cavity of the toothbrush 1 is improved as the thickness of the neck part 4 is below the said upper limit. Further, the hair can reach every corner of the oral cavity, and the dirt removal effect in the oral cavity is further enhanced.
  • the thickness means the minimum thickness of the neck portion 4.
  • the length of the neck portion 4 can be determined in consideration of the length of the head portion and the like, for example, a length of 30 to 90 mm.
  • the length of the neck part 4 is not less than the above lower limit value, it becomes easy to reach the hair to every corner in the oral cavity, and the dirt removal effect in the oral cavity is further enhanced.
  • the length of the neck portion 4 is not more than the above upper limit value, the operability of the toothbrush 1 in the oral cavity can be further enhanced.
  • the handle portion 6 has a plurality of (three in the present embodiment) gripping pieces 31a, 31b, 31c (referred to as the gripping piece 31 as appropriate) extending from the boundary with the neck portion 4 to the rear end side, And a soft portion 41 formed in a scale shape and extending toward the rear end side.
  • the gripping pieces 31a, 31b, and 31c are formed in a substantially arc shape whose central portion is convex outward with respect to both ends in the length direction.
  • the outer side means a side away from the center of the region surrounded by the gripping pieces 31a, 31b, 31c in a cross section orthogonal to the length direction.
  • the gripping pieces 31a, 31b, 31c are provided with end portions on the rear end side separated from each other.
  • the cross-sectional shape of the soft portion 41 parallel to the YZ plane is a substantially elliptical shape whose major axis is the Y-axis direction.
  • the soft part 41 has a plan view shape and a side view shape that are thickest at the central portion in the length direction and have a substantially arc-shaped outer shape toward the outside in the length direction. It is a shape that becomes gradually thinner at the contour.
  • the soft part 41 is made of a soft resin.
  • a soft resin for example, a soft resin having a hardness of JIS K 7215 Shore A of 30 or less may be used.
  • examples of such a soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, polyester elastomers, polyurethane elastomers, and silicone resins.
  • the grip pieces 31 a, 31 b, and 31 c are arranged around the outside of the soft portion 41.
  • the gripping piece 31a is arranged at a substantially central portion in the Y direction on the + Z side of the soft portion 41.
  • the gripping piece 31b is arranged on the + Z side of the soft part 41 on the ⁇ Z side with respect to the central part in the Y direction.
  • the gripping piece 31c is arranged substantially symmetrically with the gripping piece 31b on the ⁇ Z side of the soft portion 41 and on the ⁇ Y side of the central portion in the Y direction.
  • the gripping pieces 31a, 31b, and 31c are arranged at positions that do not overlap each other in a direction orthogonal to the flocked surface 20 (that is, the Z direction). That is, the gripping pieces 31a, 31b, and 31c are disposed at positions that do not overlap each other when viewed in the Z direction.
  • the surfaces of the gripping pieces 31a, 31b, and 31c that face the soft portion 41 are formed flush with the outer peripheral surface of the soft portion 41 (substantially elliptical in cross section).
  • the surfaces of the gripping pieces 31a, 31b, and 31c opposite to the surface facing the soft portion 41 have a substantially arc shape in which the cross-sectional shape swells outward with a curvature larger than the curvature of the surface facing the soft portion 41.
  • the gripping piece 31a has a finger rest 51 extending in the X direction in the vicinity of the distal end side.
  • the finger rest 51 is formed in a concave curved surface having a substantially arcuate cross-sectional contour that is deepest at the center and gradually becomes shallower toward the edge.
  • the gripping piece 31 constitutes a hard portion 50 that is integrally molded with a hard resin together with the head portion 2 and the neck portion 4.
  • a hard resin include, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS). , Acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), etc. can do.
  • PP polypropylene
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PCT polycyclohexylene dimethylene terephthalate
  • PS polyacetal
  • ABS Acrylonitrile / butadiene / styren
  • 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 thickness of the gripping pieces 31a, 31b, 31c can be set in consideration of the hardness of the soft portion 41.
  • the gripping piece 31 is made of polypropylene resin, the thickness is preferably 0.8 to 1.2 mm. Can be from 0.9 to 1.0 mm.
  • the first step of molding the hard portion 50 by injection molding using the first mold and the second step of molding the soft portion 41 by injection molding using the second mold It is manufactured through a process.
  • the first mold used in the first step is, for example, a pair of molds (for example, a fixed mold and a movable mold, or at a position between the flocked surface 20 and the back surface of the head unit 2 in parallel with the XY plane.
  • a parting line that is a joint surface between the upper mold and the lower mold (hereinafter referred to as the upper mold and the lower mold) is set.
  • the first mold M ⁇ b> 1 includes an upper mold M ⁇ b> 11 that mainly molds the surface on the flocked surface 20 side and a flocked surface 20 mainly in the region where the handle portion 6 is molded in the hard portion 50.
  • a lower mold M12 for molding the reverse side of the opposite side.
  • the surface along the outer peripheral surface of the soft portion 41 is a parting line.
  • the upper mold M11 is opposed to the surface 32a that forms the surface of the gripping piece 31a on the flocked surface 11 side, the surface 32b that molds the surface that faces the soft portion 41 of the gripping piece 31b, and the soft portion 41 of the gripping piece 31c. And a surface 32c for forming the surface.
  • the lower mold M12 includes a surface 33a that forms the back surface of the gripping piece 31a, a surface 33b that forms a surface opposite to the surface facing the soft portion 41 of the gripping piece 31b, and a soft portion 41 of the gripping piece 31c. And a surface 33c for forming a surface opposite to the surface opposite to the surface.
  • the cavity 34a for molding the grip piece 31a surrounded by the surface 32a and the surface 33a, and the grip surrounded by the surface 32b and the surface 33b A cavity 34b for molding the piece 31b and a cavity 34c for molding the gripping piece 31c surrounded by the surface 32c and the surface 33c are formed.
  • cavities for forming the head portion 2 and the neck portion 4 are formed.
  • the upper mold M11 and the lower mold M12 are clamped and cooling for a predetermined time, the upper mold M11 and the lower mold M12 are separated from each other, The hard part 50 is molded.
  • FIG. 5 is a cross-sectional view of the second mold M2 taken along the XZ plane at the approximate center of the toothbrush 1 in the width direction.
  • FIG. 6 is a cross-sectional view of the second mold M2 taken along the XZ plane at the center of the handle portion 6 in the length direction.
  • the upper mold M21 of the second mold M2 accommodates part of the accommodating portions 2M and 4M that accommodate the head portion 2 and the flocked surface 20 side of the neck portion 4 and the gripping piece 31a.
  • the housing portion 31 a ⁇ / i> M has a surface 35 that molds the outer peripheral surface of the soft portion 41 on the flocked surface 20 side. The surface 35 is formed flush with the surface facing the soft portion 41 of the grip piece 31a accommodated in the accommodating portion 31aM.
  • a suction port 61 is opened on the opposite side of the housing part 31aM from the lower mold 22.
  • a negative pressure suction device (not shown) is connected to the suction port 61 and sucks the gripping piece 31a housed in the housing portion 31aM with negative pressure.
  • a plurality (two in FIG. 5) of suction ports 61 are arranged at intervals in the length direction.
  • the lower mold M22 of the second mold M2 includes a housing part 2M, 4M for housing the head part 2 and the neck part 4 on the side of the flocked surface 20, a housing part 31bM for housing the gripping piece 31b, and a gripping piece 31c. And a surface 36 for molding the outer peripheral surface of the soft portion 41 opposite to the flocked surface 20 side.
  • the surface 36 is formed flush with the gripping piece 31b accommodated in the accommodating portion 31bM and the surface facing the soft portion 41 of the grasping piece 31c accommodated in the accommodating portion 31cM.
  • the gripping pieces 31a, 31b, 31c, the surface 35 of the upper mold M21, and the surface 36 of the lower mold M22 form a cavity 41M for molding the soft portion 41.
  • a suction port 62 is opened on the side opposite to the upper mold 21 in the accommodating portion 31bM.
  • a negative pressure suction device (not shown) is connected to the suction port 62 and sucks the gripping piece 31b accommodated in the accommodating portion 31bM with negative pressure.
  • a suction port 63 is opened on the side opposite to the upper mold 21 in the housing portion 31cM.
  • a negative pressure suction device (not shown) is connected to the suction port 63 and sucks the gripping piece 31c housed in the housing portion 31cM with negative pressure. Similar to the suction port 61, a plurality of (for example, two) suction ports 62 and 63 are arranged at intervals in the length direction.
  • the hard part 50 is accommodated in the accommodating parts 2M, 4M, the accommodating part 31aM, the accommodating part 31bM, and the accommodating part 31cM inside the upper mold M21 and the lower mold M22.
  • the gripping piece 31a of the hard part 50 accommodated inside the upper mold M21 and the lower mold M22 is sucked by the negative pressure suction device through the suction port 61 and held in the upper mold M21 (housing part 31aM).
  • the gripping pieces 31b, 31c of the hard part 50 accommodated in the upper mold M21 and the lower mold M22 are sucked by the negative pressure suction device through the suction ports 62, 63, and the lower mold M22 (accommodating part 31bM). , 31 cM).
  • a hair bundle is implanted in the head portion 2 of the obtained handle body 10.
  • the hair bundle is folded in two and a flat wire sandwiched between the two is driven into the flock hole 22 so that the hair bundle is planted, and the lower end of the hair bundle is melted to become the flocked portion.
  • Examples thereof include a heat-sealing method in which the resin is pressed into a resin and fixed, and an in-mold method in which the bottom end of the hair bundle is heated to form a molten lump, and then the molten resin is injected into the mold to mold the flocked portion.
  • the head portion 2, the neck portion 4 and the gripping pieces 31a to 31c constitute the hard portion 50, so that the rigidity during brushing is ensured and the cleaning force is maintained, and the handle
  • the gripping pieces 31a to 31c are elastically deformed and bent, and the elastic restoring force is transmitted to the palm, so that a high fit is imparted.
  • the gripping pieces 31a to 31c in the toothbrush 1 are not restrained because the rear end portions are separated from each other, so that the elastic restoring force accompanying the bending of the gripping pieces 31a to 31c is efficiently transmitted to the palm.
  • the soft portion 41 when the handle portion 6 is gripped, the soft portion 41 is also elastically deformed in addition to the elastic deformation of the gripping pieces 31a to 31c. Therefore, the elastic restoring forces of the gripping pieces 31a to 31c and the soft portion 41 are combined, so that a high fit can be obtained in the entire handle portion 6.
  • a space in which the soft portion 41 around which the gripping pieces 31a to 31c are arranged is deformed on the rear end side is restricted.
  • the toothbrush 1 of the present embodiment since the rear end side ends of the gripping pieces 31a to 31c are separated from each other, the rear end side of the soft portion 41 can be freely deformed without being restricted, Flexibility improves and can contribute to creation of a high fit.
  • the grip pieces 31a to 31c are arranged around the outside of the soft part 41, the area where the soft part 41 is exposed and touched by the user can be reduced. Therefore, in the toothbrush 1 of this embodiment, it can suppress that a usability
  • the handle body 10 can be formed only with a mold that opens and closes in the Z direction, which contributes to a reduction in manufacturing costs.
  • FIGS. 7 and 8 the same components as those of the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted.
  • FIG. 7 is a cross-sectional view of the handle portion 6 of the toothbrush 1 according to the second embodiment taken along a plane parallel to the YZ plane.
  • the handle portion 6 has a shaft-shaped portion 37a extending in the Z direction from the gripping piece 31a, a shaft-shaped portion 37b extending in the Z direction from the gripping piece 31b, and a shaft-shaped extending from the gripping piece 31c in the Z direction. Part 37c.
  • the distal end of the shaft-shaped portion 37b and the distal end of the shaft-shaped portion 37c are arranged flush with the outer peripheral surface of the soft portion 41 on the flocked surface 20 side.
  • Other configurations are the same as those of the toothbrush 1 of the first embodiment.
  • FIG. 8 is a cross-sectional view of the second mold M2 taken along the XZ plane at the center in the length direction of the handle portion 6 in the toothbrush 1 according to the second embodiment.
  • the tip of the shaft-shaped part 37a contacts the surface 36 of the lower mold M22. Touch.
  • the gripping piece 31a is housed and held in the housing portion 31aM without being bent and protruding into the cavity 41M.
  • the tip of the shaft-shaped portion 37b and the tip of the shaft-shaped portion 37c abut against the surface 35 of the upper mold M21.
  • the gripping piece 31b is housed and held in the housing portion 31bM without being bent and protruding into the cavity 41M.
  • the gripping piece 31c is housed and held in the housing portion 31cM without being bent and protruding into the cavity 41M. It is preferable to provide one or more shaft-shaped portions 37 at intervals in the length direction of the handle portion 6. Further, as the cross-sectional shape of the shaft-shaped portion 37, a desired shape such as a circle, an ellipse, or a square can be selected.
  • the handle body 10 including the soft portion 41 in which the gripping pieces 31a, 31b, and 31 are arranged around the outside is formed.
  • the shaft-shaped portions 37a to 37c abut on the second mold M2.
  • FIGS. 9 and 10 a third embodiment of the toothbrush 1 will be described with reference to FIGS. 9 and 10.
  • the same reference numerals are given to the same elements as those of the second embodiment shown in FIGS. 7 and 8, and the description thereof is omitted.
  • FIG. 9 is a cross-sectional view of the handle portion 6 of the toothbrush 1 according to the third embodiment taken along a plane parallel to the YZ plane.
  • the tip of the shaft-shaped portion 37 a is disposed flush with the bottom surface of the recess 38 a formed on the outer peripheral surface on the back surface side of the soft portion 41.
  • the tip of the shaft-shaped portion 37b is disposed flush with the bottom surface of the recess 38b formed on the outer peripheral surface of the soft portion 41 on the flocked surface 20 side.
  • the tip of the shaft-shaped portion 37c is disposed flush with the bottom surface of the recess 38c formed on the outer peripheral surface of the soft portion 41 on the flocked surface 20 side.
  • Other configurations are the same as those of the toothbrush 1 of the second embodiment.
  • FIG. 10 is a cross-sectional view of the second mold M2 taken along the XZ plane at the center in the length direction of the handle portion 6 in the toothbrush 1 according to the second embodiment.
  • the surface 35 of the upper mold M21 is provided with a convex portion 39b corresponding to the recess 38b and a convex portion 39c corresponding to the recess 38c.
  • a convex portion 39a corresponding to the recess 38a is provided on the surface 36 of the lower mold M22.
  • the tip of the shaft-shaped part 37a comes into contact with the surface of the convex part 39a in the lower mold M22.
  • the gripping piece 31a is housed and held in the housing portion 31aM without being bent and protruding into the cavity 41M.
  • the tip of the shaft-shaped part 37b abuts on the surface of the convex part 39b in the upper mold M21.
  • the gripping piece 31b is housed and held in the housing portion 31bM without being bent and protruding into the cavity 41M.
  • the tip of the shaft-shaped portion 37c comes into contact with the surface of the convex portion 39c in the upper mold M21.
  • the gripping piece 31c is housed and held in the housing portion 31cM without being bent and protruding into the cavity 41M.
  • the handle body 10 including the soft portion 41 in which the gripping pieces 31a, 31b, and 31 are arranged around the outside is formed.
  • the tips of the shaft-shaped portions 37a to 37c are in contact with the bottom surfaces of the recesses 38a to 38c. Since the soft portions 41 are compressed and thinned when the gripping pieces 31a to 31c are gripped, the tips of the shaft-shaped portions 37a to 37c protrude from the outer peripheral surface of the soft portion 41. It becomes possible to suppress that.
  • FIGS. 11 to 15 a fourth embodiment of the toothbrush 1 will be described with reference to FIGS. 11 to 15.
  • the same components as those of the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted.
  • FIG. 11 is a plan view of the toothbrush 1
  • FIG. 12 is a side view of the toothbrush 1.
  • the toothbrush 1 in FIG. 11 includes a head portion 2 having a substantially square shape in plan view disposed on the front end side in the length direction, a neck portion 4 extending from the head portion 2 to the rear end side, and the neck portion 4.
  • a substantially elongated handle body 10 having a handle portion 6 extending on the rear end side and a flocked portion (not shown) provided on the head portion 2 are provided.
  • the head portion 2 is formed in a substantially rectangular flat plate shape in which the length direction of the handle body 10 is long, and the top portion on the neck portion 4 side is cut off with a curve in plan view, and the flocked surface which is the upper surface in FIG. In FIG. 20, a plurality of flock holes 22 are formed.
  • a hair bundle (not shown) in which the bristles are bundled is planted in the tuft hole 22 to form a tuft portion including a plurality of tufts.
  • the length direction of the handle body 10 is the X direction
  • the width direction parallel to the flocked surface 20 and perpendicular to the length direction of the handle body 10 is the Y direction
  • the thickness is perpendicular to the flocked surface 20.
  • the vertical direction is referred to as the Z direction.
  • the side on which the flocked surface 20 faces is referred to as the front surface
  • the side opposite to the side on which the flocked surface 20 faces is referred to as the back surface.
  • the size of the head portion 2 can be determined in consideration of the operability in the oral cavity. If the width of the head portion 2 is too large, the operability in the oral cavity will be reduced, and if it is too small, the number of hair bundles to be implanted will be too small, and the cleaning effect will be easily impaired. For this reason, the width of the head portion 2 is, for example, 5 to 13 mm.
  • the thickness of the head portion 2 can be determined in consideration of the material of the handle body 10 and the like, and is preferably 1.5 to 5 mm, and more preferably 2 to 3 mm. If the length of the head part 2 is too long, the operability in the oral cavity is liable to be impaired, and if it is too short, the number of hair bundles to be implanted becomes too small and the cleaning effect is liable to be impaired. For this reason, the length of the head portion 2 is appropriately determined in the range of 10 to 26 mm.
  • the shape of the flock hole 22 is not particularly limited, and examples thereof include a circle such as a perfect circle or an ellipse, and a polygon such as a triangle and a rectangle.
  • the number of flock holes 22 is not particularly limited, and is 10 to 60, for example.
  • the diameter of the flock hole 22 is determined according to the desired thickness of the hair bundle 23, and is set to 1 to 3 mm, for example.
  • the arrangement pattern of the flock holes 22 is not particularly limited, and may be any arrangement pattern such as a so-called grid pattern or zigzag pattern.
  • the bristles constituting the hair bundle 23 are bristles (taper hairs) whose diameter gradually decreases toward the bristles, and bristles (straight bristles) having substantially the same outer diameter except for the rounded portion of the bristles.
  • the material of the hair is, for example, polyamide such as 6-12 nylon and 6-10 nylon, polyester such as PET, PBT, polytrimethylene terephthalate (PTT), PEN, polybutylene naphthalate (PBN), and polyolefin such as PP.
  • Synthetic resin materials such as olefin elastomers and styrene elastomers can be used. These resin materials may be used individually by 1 type, and may be used in combination of 2 or more type.
  • the bristle may have a multi-core structure having a core part and at least one or more sheath parts provided outside the core part.
  • the cross-sectional contour of the hair is not particularly limited, and is, for example, a circle such as a perfect circle or an ellipse, a polygon such as a triangle, a rectangle, a pentagon, or a hexagon, a star, a three-leaf clover, or a four-leaf clover. Etc.
  • the hair bundle may be composed of all the hairs having the same thickness, or two or more hairs having different thicknesses may be combined.
  • the hair length is preferably 8 mm to 15 mm for adults and 6 mm to 12 mm for children, for example.
  • a plurality of hairs having different thicknesses may be used in combination depending on purposes such as a feeling of use, a feeling of cleaning, a cleaning effect, and durability.
  • the neck portion 4 connects the head portion 2 and the handle portion 6.
  • the neck portion 4 extends from the front end boundary with the head portion 2 to the handle portion 6 with substantially the same diameter, and then expands to reach the rear end side boundary with the handle portion 6.
  • the rear end side boundary is, for example, the end point of the diameter expansion of the neck portion 4 (that is, the end point of the straight line that forms both edges of the widened portion or the bending direction of the curve that forms both edges of the widened portion in plan view) Is a position (inflection point)).
  • the width of the neck portion 4 is preferably 3.0 to 4.5 mm, and more preferably 3.0 to 4.2 mm.
  • the width of the neck portion 4 is equal to or greater than the lower limit value, it is easy to suppress the strength of the neck portion 4 from being lowered, and the durability of the toothbrush 1 is enhanced. Furthermore, the toothbrush 1 does not become too soft, and a good feeling of use is easily obtained.
  • the operativity in the oral cavity of the toothbrush 1 is improved as the width
  • the width of the neck portion 4 is not constant, the width of the neck portion 4 means the minimum width of the neck portion 4.
  • the thickness of the neck portion 4 is preferably 3.0 to 4.5 mm, and more preferably 3.0 to 4.2 mm.
  • the thickness is equal to or more than the lower limit value, it is easy to suppress the strength of the neck portion 4 from being lowered, and the durability of the toothbrush 1 is enhanced. Furthermore, the toothbrush 1 does not become too soft, and a good feeling of use is easily obtained.
  • the operativity in the oral cavity of the toothbrush 1 is improved as the thickness of the neck part 4 is below the said upper limit. Further, the hair can reach every corner of the oral cavity, and the dirt removal effect in the oral cavity is further enhanced.
  • the thickness means the minimum thickness of the neck portion 4.
  • the length of the neck portion 4 can be determined in consideration of the length of the head portion and the like, for example, a length of 30 to 90 mm.
  • the length of the neck part 4 is not less than the above lower limit value, it becomes easy to reach the hair to every corner in the oral cavity, and the dirt removal effect in the oral cavity is further enhanced.
  • the length of the neck portion 4 is not more than the above upper limit value, the operability of the toothbrush 1 in the oral cavity can be further enhanced.
  • the handle portion 6 has a plurality of (three in the present embodiment) gripping pieces 31a, 31b, 31c (referred to as the gripping piece 31 as appropriate) extending from the boundary with the neck portion 4 to the rear end side, And a soft portion 41 formed in a scale shape and extending toward the rear end side.
  • the gripping pieces 31a, 31b, and 31c are formed in a substantially arc shape whose central portion is convex outward with respect to both ends in the length direction.
  • the outer side means a side away from the center of the region surrounded by the gripping pieces 31a, 31b, 31c in a cross section orthogonal to the length direction.
  • the gripping pieces 31a, 31b, 31c are provided with end portions on the rear end side separated from each other.
  • the cross-sectional shape of the soft part 41 parallel to the YZ plane is a substantially elliptical shape whose major axis is the Y-axis direction.
  • the soft portion 41 has a plan view shape and a side view shape that are thickest at the central portion in the length direction and have a substantially arc-shaped outer shape toward the outside in the length direction. It is a shape that becomes gradually thinner at the contour.
  • the soft part 41 is made of a soft resin.
  • a soft resin for example, a soft resin having a hardness of JIS K 7215 Shore A of 30 or less may be used.
  • examples of such a soft resin include elastomer resins such as polyolefin elastomers, styrene elastomers, polyester elastomers, polyurethane elastomers, and silicone resins.
  • the grip pieces 31 a, 31 b, and 31 c are arranged around the outside of the soft portion 41.
  • the gripping piece 31a is arranged at a substantially central portion in the Y direction on the + Z side of the soft portion 41.
  • the gripping piece 31b is arranged on the + Z side of the soft part 41 on the ⁇ Z side with respect to the central part in the Y direction.
  • the gripping piece 31c is arranged substantially symmetrically with the gripping piece 31b on the ⁇ Z side of the soft portion 41 and on the ⁇ Y side of the central portion in the Y direction.
  • the outer contour of the soft portion 41 is arranged inside a circle circumscribing the gripping pieces 31a, 31b, and 31c.
  • the gripping pieces 31a, 31b, and 31c are arranged at positions that do not overlap each other in a direction orthogonal to the flocked surface 20 (that is, the Z direction). That is, the gripping pieces 31a, 31b, and 31c are disposed at positions that do not overlap each other when viewed in the Z direction.
  • the surfaces of the gripping pieces 31a, 31b, and 31c that face the soft portion 41 are formed flush with the outer peripheral surface of the soft portion 41 (substantially elliptical in cross section).
  • the surfaces of the gripping pieces 31a, 31b, and 31c opposite to the surface facing the soft portion 41 have a substantially arc shape in which the cross-sectional shape swells outward with a curvature larger than the curvature of the surface facing the soft portion 41.
  • the gripping piece 31a has a finger rest 51 extending in the X direction in the vicinity of the distal end side.
  • the finger rest 51 is formed in a concave curved surface having a substantially arcuate cross-sectional contour that is deepest at the center and gradually becomes shallower toward the edge.
  • the gripping piece 31 constitutes a hard portion 50 that is integrally molded with a hard resin together with the head portion 2 and the neck portion 4.
  • a hard resin include, for example, polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS). , Acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS), etc. can do.
  • PP polypropylene
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PCT polycyclohexylene dimethylene terephthalate
  • PS polyacetal
  • ABS Acrylonitrile / butadiene / styren
  • 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 thickness of the gripping pieces 31a, 31b, 31c can be set in consideration of the hardness of the soft portion 41.
  • the gripping piece 31 is made of polypropylene resin, the thickness is preferably 0.8 to 1.2 mm. Can be from 0.9 to 1.0 mm.
  • the soft part 41 has through-holes 137a, 137b, 137c having a circular cross section extending in a direction (Z direction) orthogonal to the flocked surface 20.
  • the through-hole (first through-hole) 137a is opened with the + Z side end facing the gripping piece 31a and the ⁇ Z side end exposed to the outside.
  • the through-hole (second through-hole) 137b is opened with the ⁇ Z side end facing the gripping piece 31b and the + Z side end exposed to the outside.
  • the through-hole (second through-hole) 137c is opened with the ⁇ Z side end facing the gripping piece 31c and the + Z side end exposed to the outside.
  • the through-holes 137a are spaced apart from each other along the length direction of the gripping piece 31 including the position of the finger pad 51 and the position near the rear end side end of the gripping piece 31a.
  • a plurality (four in this embodiment) are arranged.
  • a plurality of (three in this embodiment) through-holes 137b are arranged at intervals along the gripping piece 31b so as to be positioned approximately in the middle of the through-hole 137a in the X direction.
  • a plurality of (three in this embodiment) through-holes 137c are arranged at substantially the same position of the through-hole 137b in the X direction at intervals along the gripping piece 31c.
  • the number of the through holes 137a, 137b, and 137c is preferably 3 or more and 10 or less, respectively.
  • the number of the through holes 137a, 137b, and 137c is less than three, the deformation of the soft part 41 when the handle part 6 is grasped may be reduced, and the fit feeling that can be obtained may be reduced. There is a possibility that the holding pieces 31a, 31b, 31c are not stably held on the second mold by the shaft member in the second step.
  • the number of the through holes 137a, 137b, and 137c exceeds 10, there is a possibility that the deformation of the soft portion 41 becomes too large to obtain an appropriate fit.
  • the cross-sectional shape of the through-hole 37 may be a desired shape such as a polygon such as a circle, an ellipse, a triangle, or a rectangle, or a polygon such as a star.
  • the first step of molding the hard portion 50 by injection molding using the first mold and the second step of molding the soft portion 41 by injection molding using the second mold It is manufactured through a process.
  • the first mold used in the first step is, for example, a pair of molds (for example, a fixed mold and a movable mold, or at a position between the flocked surface 20 and the back surface of the head unit 2 in parallel with the XY plane.
  • a parting line that is a joint surface between the upper mold and the lower mold (hereinafter referred to as the upper mold and the lower mold) is set.
  • the first mold M ⁇ b> 1 includes an upper mold M ⁇ b> 11 that mainly molds the surface on the flocked surface 20 side and a flocked surface 20 mainly in the region where the handle portion 6 is molded in the hard portion 50.
  • a lower mold M12 for molding the reverse side of the opposite side.
  • the surface along the outer peripheral surface of the soft portion 41 is a parting line.
  • the upper mold M11 opposes the surface 32a that forms the surface of the gripping piece 31a on the flocked surface 11 side, the surface 32b that molds the surface facing the soft portion 41 of the gripping piece 31b, and the soft portion 41 of the gripping piece 31c. And a surface 32c for forming the surface.
  • the lower mold M12 includes a surface 33a that forms a surface on the back side of the gripping piece 31a, a surface 33b that forms a surface opposite to the surface facing the soft portion 41 of the gripping piece 31b, and a soft portion 41 of the gripping piece 31c. And a surface 33c for forming a surface opposite to the surface opposite to the surface.
  • the cavity 34a for molding the grip piece 31a surrounded by the surface 32a and the surface 33a, and the grip surrounded by the surface 32b and the surface 33b A cavity 34b for molding the piece 31b and a cavity 34c for molding the gripping piece 31c surrounded by the surface 32c and the surface 33c are formed.
  • cavities for forming the head portion 2 and the neck portion 4 are formed.
  • the upper mold M11 and the lower mold M12 are clamped and cooling for a predetermined time, the upper mold M11 and the lower mold M12 are separated from each other, The hard part 50 is molded.
  • FIG. 14 is a cross-sectional view of the second mold M2 taken along the XZ plane at the approximate center of the toothbrush 1 in the width direction.
  • FIG. 15 is a cross-sectional view of the second mold M2 taken along the XZ plane at the center of the handle portion 6 in the length direction.
  • the upper mold M21 of the second mold M2 accommodates part of the accommodating portions 2M and 4M that accommodate the head portion 2 and the flocked surface 20 side of the neck portion 4 and the gripping piece 31a.
  • the housing portion 31aM has a surface 35 for molding the outer peripheral surface of the soft portion 41 on the side of the flocked surface 20, and shaft members 137bM and 137cM for molding the through holes 137b and 137c. .
  • the surface 35 is formed flush with the surface facing the soft portion 41 of the grip piece 31a accommodated in the accommodating portion 31aM.
  • the lower mold M22 of the second mold M2 includes a housing part 2M, 4M for housing the head part 2 and the neck part 4 on the side of the flocked surface 20, a housing part 31bM for housing the gripping piece 31b, and a gripping piece 31c.
  • the surface 36 is formed flush with the gripping piece 31b accommodated in the accommodating portion 31bM and the surface facing the soft portion 41 of the grasping piece 31c accommodated in the accommodating portion 31cM.
  • the gripping pieces 31a, 31b, 31c, the surface 35 of the upper mold M21, and the surface 36 of the lower mold M22 form a cavity 41M for molding the soft portion 41.
  • the shaft members 137bM and 137cM are formed so that their tips are flush with the surfaces of the gripping pieces 31b and 31c facing the cavity 41M.
  • the lengths of the shaft members 137bM and 137cM are such that when the upper mold M21 and the lower mold M22 are clamped, the surface and the tip of the gripping pieces 31b and 31c that are accommodated in the accommodating portions 31bM and 31cM face the cavity 41M.
  • Each is the same length.
  • the shaft member 137aM is formed so that the tip thereof is flush with the surface facing the cavity 41M of the gripping piece 31a.
  • the length of the shaft member 137aM is such that when the upper mold M21 and the lower mold M22 are clamped, the surface facing the cavity 41M of the gripping piece 31a accommodated in the accommodation part 31aM is flush with the tip part. It is.
  • the shaft members 137aM, 137bM, and 137cM can be directly formed on the second mold M2 (upper mold M21 or lower mold M22) by cutting or the like, but the second mold M2 is easily manufactured due to the ease of the manufacturing process. It is preferable to provide shaft members 137aM, 137bM, and 137cM that fit into the formed holes as separate members.
  • the hard part 50 is accommodated in the accommodating parts 2M, 4M, the accommodating part 31aM, the accommodating part 31bM, and the accommodating part 31cM inside the upper mold M21 and the lower mold M22.
  • the grip piece 31a of the hard portion 50 housed in the upper mold M21 and the lower mold M22 is supported by the shaft member 137aM and is held by the upper mold M21 (housing section 31aM). Retained.
  • the gripping pieces 31b and 31c of the hard portion 50 accommodated in the upper mold M21 and the lower mold M22 are supported by the shaft members 137bM and 137cM and held by the lower mold M22 (accommodating sections 31bM and 31cM), respectively.
  • the handle body 10 including the soft portion 41 in which the gripping pieces 31a, 31b, and 31c are disposed around the outer periphery and the through holes 137a, 137b, and 137c are formed is formed.
  • a hair bundle is implanted in the head portion 2 of the obtained handle body 10.
  • the hair bundle is folded in two and a flat wire sandwiched between the two is driven into the flock hole 22 so that the hair bundle is planted, and the lower end of the hair bundle is melted to become the flocked portion.
  • Examples thereof include a heat-sealing method in which the resin is pressed into a resin and fixed, and an in-mold method in which the bottom end of the hair bundle is heated to form a molten lump, and then the molten resin is injected into the mold to mold the flocked portion.
  • the head portion 2, the neck portion 4 and the gripping pieces 31a to 31c constitute the hard portion 50, so that the rigidity during brushing is ensured and the cleaning force is maintained, and the handle
  • the gripping pieces 31a, 31b, 31c are elastically deformed and bent, and the elastic restoring force is transmitted to the palm, so that a high fit is imparted.
  • the gripping pieces 31a, 31b, and 31c in the toothbrush 1 are not restrained because their rear end side ends are separated from each other, so that the elastic restoring force accompanying the bending of the gripping pieces 31a, 31b, and 31c is efficiently increased in the palm of the hand. It is transmitted to.
  • the soft portion 41 is also elastically deformed. Therefore, the elastic restoring forces of the gripping pieces 31a to 31c and the soft portion 41 are combined, so that a high fit can be obtained in the entire handle portion 6. Furthermore, since the toothbrush 1 having the above-described configuration has the through holes 137a, 137b, and 137c formed in the soft portion 41, the soft portion 41 is easily deformed when the handle portion 6 is grasped, and a higher fit is provided. Obtainable.
  • the toothbrush 1 having the above-described configuration is effective when the gripping pieces 31a, 31b, and 31c are gripped because one end of the through holes 137a, 137b, and 137c is opened facing the gripping pieces 31a, 31b, and 31c.
  • the soft part 41 can be deformed.
  • the soft portion 41 around which the gripping pieces 31a, 31b, and 31c are arranged is deformed on the rear end side. It will be regulated.
  • the toothbrush 1 of this embodiment since the rear end side ends of the gripping pieces 31a, 31b, 31c are separated from each other, the rear end side of the soft portion 41 can be freely deformed without being restricted. Thus, flexibility can be improved and a high fit can be created.
  • the gripping pieces 31a, 31b, and 31c are arranged around the outside of the soft part 41, the area where the soft part 41 is exposed and touched by the user can be reduced.
  • the outer contour of the soft portion 41 is disposed inside the circle circumscribing the gripping pieces 31a, 31b, 31c.
  • the opportunity for a user to touch the soft part 41 can be reduced. Therefore, in the toothbrush 1 of this embodiment, it can suppress that a usability
  • the gripping pieces 31a, 31b, and 31c are arranged at positions that do not overlap each other in the direction orthogonal to the flocked surface 20, so that some of the mold parts are in the opening / closing direction of the mold.
  • the gripping pieces 31a, 31b, and 31c are supported by the shaft members 137aM, 137bM, and 137cM and held in the accommodating portions 31aM, 31bM, and 31cM, the gripping pieces 31a, There is no need to separately provide an external device for accommodating 31b and 31c in the accommodating portions 31aM, 31bM, and 31cM, and the manufacturing cost can be reduced.
  • the configuration in which the rear end side end portions of the gripping pieces 31a to 31c are provided separately from each other is illustrated, but the present invention is not limited to this configuration, and at least one It is sufficient that the two gripping pieces are separated.
  • the grip piece whose rear end side portion is separated from other grip pieces is elastically deformed and bent when the handle portion 6 is grasped, and its elastic restoring force is transmitted to the palm. Compared with the case where the rear end side ends of the gripping pieces are connected, a high fit is imparted.
  • the configuration having the three gripping pieces 31a to 31c is illustrated.
  • the number of the gripping pieces may be two or more. As described above, from the viewpoint of manufacturing cost, it is preferable that the number of gripping pieces is small, but from the viewpoint of feeling of use including stickiness, for example, it is preferable to arrange three or more and five or less gripping pieces. In particular, it is more preferable to dispose the three gripping pieces shown in the above embodiment from the viewpoint of achieving both manufacturing cost and usability.
  • the configuration in which the hard portion 50 and the soft portion 41 are integrally formed by using the second mold M2 containing the hard portion 50 is exemplified.
  • the structure is such that the soft portion 41 is formed separately in a separate process, and the soft portion 41 is fixed at a position where the gripping pieces 31a to 31c are arranged around the outside using an adhesive or the like. There may be.
  • molds the hard part 50 and the soft part 41 integrally was illustrated using the 2nd metal mold
  • the structure may be such that the soft part 41 is formed separately in a separate process and the soft part 41 is fixed at a position where the gripping pieces 31a to 31c are arranged around the outside using an adhesive or the like. Good.
  • through holes 137a, 137b, and 137c are provided in the soft portion 41, one end of each of the through holes 137a, 137b, and 137c is opened facing the gripping pieces 31a, 31b, and 31c, and the other end is exposed to the outside. It is preferable to open them.
  • the cross-sectional shape of the through-holes 137a, 137b, 137c was illustrated circularly, it is not limited to this structure, For example, an ellipse shape, an ellipse shape, a polygon shape It is possible to appropriately select a shape having excellent design properties such as a rectangular shape or a triangular shape, or a star shape.
  • the number of through-holes 137a, 137b, and 137c shown in the above embodiment is an example, and can be suitably set to an arbitrary number from the range of preferably 3 or more and 10 or less.
  • the present invention can be applied to toothbrushes and toothbrush manufacturing methods.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)

Abstract

L'objet de la présente invention est de fournir une brosse à dents qui permette d'obtenir une sensation très personnalisée tout en présentant une bonne efficacité de nettoyage et une bonne sensation d'utilisation. La brosse à dents possède : une partie tête (2) ayant une surface plantée de brins (20) au niveau du côté pointe dans la direction longitudinale ; une partie manche (6) disposée davantage en direction du côté arrière que la partie tête ; une partie col (4) disposée entre la surface plantée de brins et la partie manche. La partie manche comprend : une pluralité de pièces de préhension (31) formées d'une résine dure et se divisant à partir de la limite avec la partie col pour s'étendre en direction du côté arrière ; une partie souple (41) formée d'une résine souple sous une forme allongée, s'étendant en direction du côté arrière et comprenant une pluralité de pièces de préhension disposées autour de l'extérieur d'une section transversale perpendiculaire à la direction longitudinale. La partie d'extrémité du côté arrière d'au moins l'une des pièces de préhension est séparée des autres pièces de préhension.
PCT/JP2017/043102 2016-12-12 2017-11-30 Brosse à dents et son procédé de fabrication Ceased WO2018110299A1 (fr)

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JP2016-240153 2016-12-12
JP2016240154A JP6842905B2 (ja) 2016-12-12 2016-12-12 歯ブラシと歯ブラシの製造方法
JP2016240153A JP6842904B2 (ja) 2016-12-12 2016-12-12 歯ブラシ
JP2016-240154 2016-12-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12144415B2 (en) 2018-12-27 2024-11-19 Lion Corporation Toothbrush

Citations (7)

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Publication number Priority date Publication date Assignee Title
DE19858102A1 (de) * 1998-12-16 2000-06-21 Zahoransky Anton Gmbh & Co Bürstenkörper sowie Verfahren zum Herstellen eines Bürstenkörpers
JP2002034659A (ja) * 2000-07-19 2002-02-05 Lion Corp 歯ブラシハンドルおよびその製造方法
DE10314032A1 (de) * 2003-03-28 2004-10-21 Braun Formenbau Gmbh Werkzeugsystem sowie Verfahren zum Mehrkomponentenspritzgießen, insbesondere Zweikomponentenspritzgießen, von Kunststoffkörpern
JP2007083687A (ja) * 2005-09-26 2007-04-05 Sumitomo Electric Ind Ltd 射出成形回路部品の製造方法とそれに用いる金型
JP2008544785A (ja) * 2005-07-01 2008-12-11 グラクソスミスクライン・コンシューマー・ヘルスケア・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ウント・コムパニー・コマンディットゲゼルシャフト 歯ブラシ
JP2015205494A (ja) * 2014-04-23 2015-11-19 株式会社小糸製作所 二色成形法と二色成形用金型および二色成形品
WO2016208333A1 (fr) * 2015-06-24 2016-12-29 ライオン株式会社 Brosse à dents

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858102A1 (de) * 1998-12-16 2000-06-21 Zahoransky Anton Gmbh & Co Bürstenkörper sowie Verfahren zum Herstellen eines Bürstenkörpers
JP2002034659A (ja) * 2000-07-19 2002-02-05 Lion Corp 歯ブラシハンドルおよびその製造方法
DE10314032A1 (de) * 2003-03-28 2004-10-21 Braun Formenbau Gmbh Werkzeugsystem sowie Verfahren zum Mehrkomponentenspritzgießen, insbesondere Zweikomponentenspritzgießen, von Kunststoffkörpern
JP2008544785A (ja) * 2005-07-01 2008-12-11 グラクソスミスクライン・コンシューマー・ヘルスケア・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ウント・コムパニー・コマンディットゲゼルシャフト 歯ブラシ
JP2007083687A (ja) * 2005-09-26 2007-04-05 Sumitomo Electric Ind Ltd 射出成形回路部品の製造方法とそれに用いる金型
JP2015205494A (ja) * 2014-04-23 2015-11-19 株式会社小糸製作所 二色成形法と二色成形用金型および二色成形品
WO2016208333A1 (fr) * 2015-06-24 2016-12-29 ライオン株式会社 Brosse à dents

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12144415B2 (en) 2018-12-27 2024-11-19 Lion Corporation Toothbrush

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