WO2024135197A1 - 歯ブラシ - Google Patents

歯ブラシ Download PDF

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Publication number
WO2024135197A1
WO2024135197A1 PCT/JP2023/041603 JP2023041603W WO2024135197A1 WO 2024135197 A1 WO2024135197 A1 WO 2024135197A1 JP 2023041603 W JP2023041603 W JP 2023041603W WO 2024135197 A1 WO2024135197 A1 WO 2024135197A1
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WO
WIPO (PCT)
Prior art keywords
neck portion
neck
dimension
thickness
fitting
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/JP2023/041603
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
彩香 遠藤
晃大 石川
玲央奈 野田
優子 青木
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
Application filed by Lion Corp filed Critical Lion Corp
Priority to JP2024565689A priority Critical patent/JPWO2024135197A1/ja
Priority to CN202380086598.8A priority patent/CN120379565A/zh
Priority to KR1020257008309A priority patent/KR20250121527A/ko
Publication of WO2024135197A1 publication Critical patent/WO2024135197A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B1/00—Brush bodies and bristles moulded as a unit
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • A46B5/0029—Head made of soft plastics, rubber or rubber inserts in plastics matrix
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/0095—Removable or interchangeable brush heads
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the present invention relates to a toothbrush.
  • This application claims priority based on Japanese Patent Application No. 2022-205743 filed on December 22, 2022, the contents of which are incorporated herein by reference.
  • Integral molded toothbrushes have been proposed, which are manufactured using only an injection molding machine (for example, Patent Document 1). Integral molded toothbrushes are manufactured by molding the filament and head base as a single unit, so there is no need to procure filament material or use a bristle implantation machine, and manufacturing costs can be reduced compared to bristle implanted toothbrushes.
  • the toothbrush head thinner.
  • the insertion section of the handle body which is molded from a hard resin
  • the brush section which is made from a soft resin. This makes it difficult to increase the thickness of the insertion section, and therefore difficult to increase the rigidity of the head section.
  • the head section is prone to significant bending, causing the problem of reduced maneuverability of the toothbrush.
  • the present invention was made in consideration of the above points, and one of its objectives is to provide a toothbrush that can reduce the thickness of the head portion while preventing the head portion from bending too much, even when using a brush portion molded from a soft resin.
  • a brush comprising a handle body formed of hard resin and extending in a longitudinal direction, and a brush portion formed of soft resin and provided on one side of the handle body in the longitudinal direction, wherein the handle body has a neck portion extending in the longitudinal direction, and a fitting portion disposed on one side of the longitudinal direction relative to the neck portion and protruding to one side in the longitudinal direction, the brush portion having a brush base portion and a plurality of filaments molded integrally with the brush base portion, the brush base portion having a fitting hole into which the fitting portion is inserted and fitted, each of the plurality of filaments protruding from the brush base portion in a thickness direction intersecting the longitudinal direction, and the neck portion having a first neck portion and a second neck portion located on the other side of the long axis direction than the first neck portion, wherein the distance between the first neck portion and the second neck portion is the same length as the dimension of the fitting portion in the long axis direction, and the dimension of the neck portion in
  • the neck portion has a fourth neck portion located on the other side of the longitudinal direction than the first neck portion, the thickness direction dimension of the fourth neck portion is the same as the maximum dimension of the brush base portion in the thickness direction, and the distance between the other end of the fitting portion in the longitudinal direction and the fourth neck portion is longer than the longitudinal direction dimension of the brush portion.
  • the present invention provides a toothbrush that can reduce the thickness of the head portion while preventing the head portion from becoming too flexed, even when using a brush portion molded from a soft resin.
  • FIG. 2 is a front view showing the toothbrush of the embodiment.
  • FIG. 2 is a side view showing the toothbrush of the embodiment.
  • FIG. 2 is a front view showing the handle body of the embodiment.
  • FIG. 2 is a side view showing the handle body of the embodiment.
  • FIG. 2 is a front view showing the brush unit of the embodiment.
  • 6 is a cross-sectional view showing the brush part of the embodiment, taken along line AA in FIG. 5 .
  • FIG. 2 is a diagram showing a part of a toothbrush according to an embodiment.
  • an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system.
  • the X-axis direction is the long axis direction.
  • the long axis direction is the direction in which the toothbrush extends.
  • the +X side is the tip side of the toothbrush
  • the -X side is the rear end side of the toothbrush.
  • the tip side of the toothbrush will be simply referred to as the "tip side” or "one side in the long axis direction”
  • the rear end side of the toothbrush will be simply referred to as the "rear end side” or "the other side in the long axis direction.”
  • the Y-axis direction is perpendicular to the long axis direction and corresponds to the width direction of the toothbrush.
  • the +Y side is one side in the width direction of the toothbrush, and the -Y side is the other side in the width direction of the toothbrush.
  • the Z-axis direction intersects the X-axis direction and is perpendicular to the Y-axis direction, and is the thickness direction of the toothbrush. In this embodiment, the Z-axis direction is perpendicular to both the X-axis direction and the Y-axis direction.
  • the +Z side is the front side of the toothbrush, and the -Z side is the back side of the toothbrush. In the following description, the front side of the toothbrush will be simply referred to as the "front side”, and the back side of the toothbrush will be simply referred to as the "back side”.
  • the dimension of a component in its long axis direction may be simply referred to as "length”.
  • the dimension of a component in its width direction may be simply referred to as "width”, and the dimension of a component in its thickness direction may be simply referred to as “thickness”.
  • Viewing an object from the front may be referred to as “front view”, and the shape of an object viewed from the front may be referred to as “front view shape”.
  • Viewing an object from the width direction may be referred to as "side view”, and the shape of an object viewed from the width direction may be referred to as "side view shape”.
  • the toothbrush 1 includes a handle body 10 and a brush section 20.
  • the handle body 10 and the brush section 20 are separate members.
  • the handle body 10 and the brush section 20 are both made of resin.
  • the handle body 10 is rod-shaped and extends in the longitudinal direction.
  • the brush section 20 is provided on the tip side of the handle body 10, i.e., on one side (+X side) in the longitudinal direction.
  • the brush section 20 is detachably attached to the handle body 10.
  • the brush section 20 may be molded by insert molding using the handle body 10 as an insert member, in which case the brush section 20 and the handle body 10 may be integrated.
  • FIG. 3 is a front view of the handle body 10 of this embodiment.
  • FIG. 4 is a side view of the handle body 10 of this embodiment.
  • the handle body 10 has a rod-shaped handle main body 11 extending in the longitudinal direction, and a fitting portion 15 that protrudes from the tip end of the handle main body 11 toward the tip side, i.e., to one side in the longitudinal direction (+X side).
  • the brush part 20 is attached to the handle body 10 by fitting the fitting portion 15 into a fitting hole 27 of the brush part 20 described below.
  • the length of the handle body 10 can be, for example, 100 mm or more and 200 mm or less.
  • the handle body 10 is formed from a hard resin.
  • An example of the hard resin forming the handle body 10 is a resin with a flexural modulus (JIS K7171) of 1500 MPa or more and 3000 MPa or less.
  • Specific examples include polypropylene resin (PP), polybutylene terephthalate resin (PBT), polyacetal resin (POM), polyester resin (PCTA), polyethylene terephthalate copolymer (PETG), and high density polyethylene (HDPE).
  • polypropylene resin which is a general-purpose resin, is preferred in terms of cost
  • polybutylene terephthalate resin and polyacetal resin are preferred in terms of strength.
  • the shape of the handle body 11 in this embodiment in a front view gradually narrows from the tip side to the rear end until it reaches the first boundary 13a, at which point it gradually widens. After that, the width gradually narrows, then widens, and then narrows again.
  • the shape of the rear end of the handle body 11 in a front view is approximately semicircular. Note that if the shape of the handle body 11 in a front view gradually narrows from the tip side to the rear end, then extends in the longitudinal direction at the same width, and then gradually widens, the tip end of the portion extending in the longitudinal direction at the same width is defined as the first boundary 13a.
  • the shape of the handle body 11 in this embodiment in side view is such that from the tip to the rear end, the thickness gradually decreases and then becomes constant or gradually increases until it reaches the second boundary 13b, at which point it gradually decreases in thickness, then extends at a substantially constant thickness, and then changes to become thinner.
  • the shape of the rear end of the handle body 11 in side view is substantially semicircular.
  • the thickness gradually decreases and then becomes constant or gradually increases, then extends at a constant thickness in the longitudinal direction, then gradually decreases in thickness, then extends at a substantially constant thickness, and then changes to become thinner
  • the tip end of the portion extending at a constant thickness in the longitudinal direction is defined as the second boundary 13b.
  • the shape of the handle body 11 is not limited to the shape of this embodiment, and can be set appropriately taking into consideration strength, operability, design, etc.
  • the dimensions of the handle body 11 are not particularly limited, and can be set appropriately.
  • the handle body 11 has a handle portion 12, a neck portion 13, and a connection portion 14.
  • the handle portion 12 is the portion of the handle body 11 that is rearward of the second boundary portion 13b. In this embodiment, the length of the handle portion 12 is longer than the combined length of the neck portion 13 and the connection portion 14.
  • a finger rest 17 is provided on the tip side of the surface of the handle portion 12 that faces the front side.
  • the finger rest 17 is made of a soft resin.
  • Various elastomers such as polyurethane-based and styrene-based elastomers can be used as the soft resin that forms the finger rest 17.
  • the toothbrush 1 can be more easily gripped by placing a finger on the finger rest 17 while gripping the handle portion 12.
  • the neck portion 13 is the portion of the handle body 11 between the first boundary portion 13a and the second boundary portion 13b.
  • the neck portion 13 is rod-shaped and extends in the longitudinal direction. The shape of the neck portion 13 will be described in detail later.
  • connection part 14 is a portion of the handle body 11 that is closer to the tip side than the first boundary part 13a.
  • the connection part 14 connects the neck part 13 and the fitting part 15.
  • the width of the connection part 14 is widest at the tip end, gradually narrows toward the rear end, and is narrowest at the rear end.
  • the thickness of the connection part 14 remains substantially the same from the tip end to the rear end. In this embodiment, strictly speaking, the thickness of the connection part 14 is thickest at the tip end, gradually thins toward the rear end, and is thinnest at the rear end.
  • the connection part 14 has a first opposing surface 14a.
  • the first opposing surface 14a is the surface of the outer surface of the connection part 14 that faces the tip side.
  • the fitting part 15 is located inside the brush part 20. As shown in Figures 3 and 4, the fitting part 15 protrudes toward the tip side from the first opposing surface 14a of the connection part 14. The fitting part 15 is located further toward the tip side than the neck part 13, that is, on one side in the longitudinal direction (+X side).
  • the base of the fitting part 15 is the end part on the rear end side of the fitting part 15, which is the part that connects to the connection part 14.
  • the fitting portion 15 is provided with a pair of recesses 15a, 15b.
  • One recess 15a is recessed from a surface facing one side in the width direction of the fitting portion 15 (+Y side) toward the other side in the width direction (-Y side).
  • the other recess 15b is recessed from a surface facing the other side in the width direction of the fitting portion 15 toward one side in the width direction.
  • Each of the pair of recesses 15a, 15b is approximately semicircular in front view.
  • Fig. 5 is a front view showing the brush unit 20 of this embodiment.
  • Fig. 6 is a cross-sectional view showing the brush unit 20 of this embodiment, taken along line AA in Fig. 5.
  • the brush portion 20 is made of soft resin and has a brush base portion 21 and a plurality of filaments 28 molded integrally with the brush base portion 21, as shown in FIG.
  • the shape of the brush base 21 in this embodiment when viewed from the front changes in a curved manner so that its width gradually increases from the tip side to the rear end side.
  • the tip of the brush base 21 when viewed from the front is approximately semicircular.
  • the shape of the brush base 21 in this embodiment when viewed from the side changes so that its thickness gradually increases from the tip side to the rear end side.
  • the surface of the brush base 21 facing the rear side (-Z side) is located on the rear side when viewed from the tip side to the rear end side.
  • the upper surface 21a which is the surface of the brush base 21 facing the front side, is a flat surface that extends in a direction perpendicular to the thickness direction.
  • the outer surface of the brush base portion 21 that faces the rear end is the second opposing surface 21b.
  • the second opposing surface 21b is substantially rectangular when viewed in the longitudinal direction. As shown in FIG. 1, when the brush portion 20 is attached to the handle body 10, the second opposing surface 21b faces the first opposing surface 14a of the handle body 10 in the longitudinal direction. In this embodiment, the second opposing surface 21b contacts the first opposing surface 14a in the longitudinal direction.
  • the brush base 21 has a fitting hole 27 recessed from the second opposing surface 21b toward the tip side.
  • the fitting portion 15 is inserted into the fitting hole 27 to fit. This allows the brush portion 20 to be detachably attached to the handle body 10.
  • the surface facing the rear side (-Z side) is a flat surface that extends in a direction perpendicular to the thickness direction.
  • the surface facing the front side (+Z side) is located on the rear side from the tip side toward the rear end side.
  • the fitting hole 27 is provided with a pair of protrusions 27a, 27b.
  • One protrusion 27a protrudes to the other widthwise side from the surface facing the other widthwise side (-Y side) of the fitting hole 27.
  • the other protrusion 27b protrudes to one widthwise side from the surface facing the one widthwise side (+Y side) of the fitting hole 27.
  • each of the pair of protrusions 27a, 27b is approximately semicircular.
  • each of the filaments 28 protrudes from the upper surface 21a of the brush base 21 to the front side, that is, to one side in the thickness direction (+Z side).
  • the back side (-Z side) of each filament 28 has a cross section perpendicular to the thickness direction that is approximately triangular and has a triangular prism shape
  • the front side of each filament 28 has a triangular pyramid shape that narrows toward the front side.
  • FIG. 5 on the upper surface 21a, multiple rows composed of multiple filaments 28 aligned along the width direction are arranged at intervals from each other in the long axis direction.
  • the shape of the filaments 28 is not limited to this embodiment, and for example, the cross section perpendicular to the thickness direction may be a polygonal shape such as a square, a circle, a semicircle, a star, a spatula, or other shape.
  • the filaments 28 may be columnar protruding from the brush base 21 to the front side, or may be tapered to narrow from the brush base 21 to the front side.
  • elastomers can be used as the soft resin that constitutes the brush portion 20, but polyurethane is preferable.
  • Polyurethane has a higher tensile strength than other elastomers such as styrene-based or polyester-based elastomers, so it can ensure mechanical strength even when made thin. This makes it possible to prevent damage when fitting the fitting portion 15 with the fitting hole 27 and when the toothbrush 1 is in use.
  • polyurethane has a wider range of hardness options than the other elastomers, and the resin hardness can be selected in consideration of the usability (for example, bending of the tip of the brush molded body) according to the thickness of the brush part 20.
  • the hardness of polyurethane is preferably a Shore hardness of A90 or more and A100 or less, or a Shore hardness of D40 or more and D70 or less. If the hardness of polyurethane is softer than Shore 90A, it is easily deformed when formed with a thin wall, so the fit is weak and the brush part 20 is easily removed when the toothbrush 1 is used.
  • the hardness of polyurethane is harder than Shore 70D, pain may occur when the tip of the brush base part 21 hits oral tissue when the back surface of the brush base part 21 is inclined.
  • Shore 90A or more and 70D or less it is possible to prevent the brush part 20 from falling off when the toothbrush 1 is used, and to prevent pain from occurring when the tip of the brush base part 21 hits oral tissue.
  • Polyurethane contains at least 0.01 wt% (mass%) and no more than 1.0 wt% (mass%) of saturated/unsaturated hydrocarbons of C10 or higher, higher alcohols, fatty acid amides, fatty acid esters, low molecular weight polyethylene, polyethylene glycol (PEG), fatty acid metal salts, long-chain fatty acids, fatty acid glycerin, and silicone, or a combination of these, which function as lubricants and release agents.
  • PEG polyethylene glycol
  • fatty acid metal salts long-chain fatty acids
  • fatty acid glycerin glycerin
  • silicone silicone
  • the toothbrush 1 of this embodiment includes a head portion 5.
  • the head portion 5 is composed of a connection portion 14, a fitting portion 15, and a brush portion 20.
  • the head portion 5 is the portion of the toothbrush 1 that is closer to the tip than the neck portion 13.
  • the head portion 5 is also the portion of the toothbrush 1 that is closer to the tip than the first boundary portion 13a.
  • the head portion 5 is located in the oral cavity and is the part that cleans the oral cavity.
  • the maximum width of the head portion 5 is preferably 11 mm or less. By making the maximum width of the head portion 5 11 mm or less, the maneuverability of the head portion 5 within the oral cavity can be improved, thereby improving the cleaning ability of the oral cavity.
  • FIG. 7 shows a portion of the toothbrush 1 of this embodiment. More specifically, FIG. 7(a) is a side view showing a portion of the toothbrush 1 of this embodiment. FIG. 7(b) is a side view showing a portion of the handle body 10 of this embodiment. FIG. 7(c) is a front view showing a portion of the handle body 10 of this embodiment.
  • the neck portion 13 is a portion of the handle body 10 between the first boundary portion 13a and the second boundary portion 13b.
  • the width of the neck portion 13 of this embodiment gradually increases from the first boundary portion 13a to the second boundary portion 13b. That is, the width of the neck portion 13 is narrowest at the first boundary portion 13a and widest at the second boundary portion 13b.
  • the thickness of the neck portion 13 of this embodiment extends from the first boundary portion 13a to the second boundary portion 13b toward the rear end while thinning and then becoming constant or gradually thicker.
  • the thickness of the neck portion 13 is thinnest at a position slightly rearward of the first boundary portion 13a and thickest at the second boundary portion 13b.
  • the boundary between the neck portion 13 and the handle portion 12 is the second boundary portion 13b.
  • the boundary between the neck portion 13 and the handle portion 12 may be the position of the tip end of the finger rest 17, or may be a position from the tip end of the handle body 10 toward the rear end by a length that is 42.2% of the total length of the handle body 10.
  • the boundary between the neck portion 13 and the handle portion 12 is referred to as the second boundary 13b. In this case, the position of the rear end of the neck portion 13 is the second boundary 13b.
  • the neck portion 13 has a first neck portion P1, a second neck portion P2, a third neck portion P3, a fourth neck portion P4, and a fifth neck portion P5.
  • Each of the first neck portion P1, the second neck portion P2, the third neck portion P3, the fourth neck portion P4, and the fifth neck portion P5 is a part of the neck portion 13.
  • Each of the neck portions may be located at a different position from each other, or may be located at the same position as each other.
  • the first neck portion P1 is the portion where the neck portion 13 has the thinnest thickness. That is, the thickness of the neck portion 13, i.e., the dimension in the thickness direction, is smallest at the first neck portion P1. As described above, the thickness of the neck portion 13 in this embodiment becomes thinner from the first boundary portion 13a toward the second boundary portion 13b, and then becomes constant or gradually thicker. Therefore, the dimension in the thickness direction of the neck portion 13 becomes constant or gradually larger from the first neck portion P1 toward the rear end side, i.e., the other side (-X side) in the longitudinal direction. In this embodiment, the first neck portion P1 is located at a position slightly toward the rear end side of the first boundary portion 13a. Note that, in the neck portion 13, when the thinnest part of the neck portion 13 extends in the longitudinal direction with the same thickness, the end portion on the tip side of the thinnest part of the neck portion 13 is the first neck portion P1.
  • the thickness T1 of the first neck portion P1 is not less than 3.0 mm and not more than 4.5 mm. If the thickness T1 of the first neck portion P1 is thinner than 3.0 mm, the rigidity of the first neck portion P1 becomes too small, and stress tends to concentrate on the first neck portion P1 when the toothbrush 1 is in use. As a result, the first neck portion P1 tends to bend locally, and the usability of the toothbrush 1 decreases. If the thickness T1 of the first neck portion P1 is thicker than 4.5 mm, the portion of the neck portion 13 close to the head portion 5 will become too thick, reducing the maneuverability of the head portion 5 in the oral cavity and the usability of the toothbrush 1.
  • the thickness T1 of the first neck portion P1 by setting the thickness T1 of the first neck portion P1 to be greater than or equal to 3.0 mm and less than or equal to 4.5 mm, it is possible to prevent the first neck portion P1 from becoming prone to localized bending, and also to reduce the thickness of the portion of the neck portion 13 close to the head portion 5, thereby preventing a decrease in the usability of the toothbrush 1.
  • the second neck portion P2 is located further rearward than the first neck portion P1, i.e., on the other side (-X side) in the longitudinal direction.
  • the distance between the first neck portion P1 and the second neck portion P2 is the same as the length Lm of the fitting portion 15, i.e., the dimension in the longitudinal direction.
  • the maximum thickness Tm of the fitting portion 15 shown in FIG. 7B is 1.5 mm or more and 2.5 mm or less. If the maximum thickness Tm of the fitting portion 15 is thinner than 1.5 mm, the rigidity of the fitting portion 15 becomes too small, and therefore, when the toothbrush 1 is in use, the bending of the fitting portion 15 in the thickness direction is likely to increase. If the maximum thickness Tm of the fitting portion 15 is greater than 2.5 mm, it is difficult to reduce the thickness of the head portion 5, and it is difficult to make the head portion 5 thinner.
  • the maximum thickness Tm of the fitting portion 15 by setting the maximum thickness Tm of the fitting portion 15 to 1.5 mm or more and 2.5 mm or less, it is possible to suppress an increase in the deflection of the fitting portion 15 in the thickness direction and to make the head portion 5 thinner, thereby improving the operability of the head portion 5 in the oral cavity.
  • the neck portion 13 has a first neck portion P1 and a second neck portion P2 located rearward of the first neck portion P1, i.e., on the other side (-X side) in the longitudinal direction, the distance between the first neck portion P1 and the second neck portion P2 is the same as the length Lm of the fitting portion 15, the thickness of the neck portion 13 is thinnest at the first neck portion P1, and the thickness T1 of the first neck portion P1, the thickness T2 of the second neck portion P2, and the maximum thickness Tm of the fitting portion 15 satisfy the relationships 3.0 mm ⁇ T1 ⁇ 4.5 mm, 1.5 mm ⁇ Tm ⁇ 2.5 mm, and (T2-T1)/Tm ⁇ 0.6.
  • (T2-T1)/Tm may be referred to as the first ratio. Since the maximum thickness Tm of the fitting portion 15 is 2.5 mm or less, the head portion 5 can be made thinner as described above. In addition, since the thickness T1 of the first neck portion P1 is 4.5 mm or less, the minimum thickness of the neck portion 13 can be made thin. Furthermore, since the first ratio is 0.6 or less, the difference between the thickness T2 of the second neck portion P2 located on the rear end side by the length Lm of the fitting portion 15 from the first neck portion P1 and the thickness T1 of the first neck portion can be made small.
  • the head portion 5 can be made thinner while suppressing increased bending of the head portion 5, thereby improving the operability of the toothbrush 1. Note that with the toothbrush 1 of this embodiment, the above-mentioned effect is particularly pronounced when the maximum width of the head portion 5 is 11 mm or less, in which bending in the thickness direction of the head portion 5 is likely to occur.
  • the first ratio is 0.4 or less.
  • the increase in the deflection of the head portion 5 can be more effectively prevented, so that the operability of the toothbrush 1 can be more effectively improved, the followability of the brush portion 20 can be more effectively improved, and furthermore, the deterioration of the hygiene of the toothbrush 1 can be more effectively prevented.
  • the position of the second neck part P2 in the long axis direction is a position away from the first neck part P1 toward the rear end by the length Lm of the fitting part 15, so that the longer the length Lm of the fitting part 15, the longer the distance between the first neck part P1 and the second neck part P2 can be.
  • the shorter the length Lm of the fitting part 15, the shorter the distance between the first neck part P1 and the second neck part P2 can be.
  • the stiffness in the thickness direction of the part of the neck part 13 between the first neck part P1 and the second neck part P2 can be suitably adjusted according to the length Lm of the fitting part 15. Therefore, the force applied to the head portion 5 can be absorbed favorably by the bending of the portion of the neck portion 13 between the first neck portion P1 and the second neck portion P2, and the stress applied to the base of the fitting portion 15 can be prevented from increasing. Therefore, even when the brush portion 20 made of a soft resin is used, the head portion 5 can be made thinner while preventing the bending of the head portion 5 from increasing, thereby improving the operability of the toothbrush 1.
  • the thickness of the head portion 5 can be reduced, and further, the thickness of the first neck portion P1, which is the portion of the neck portion 13 closest to the head portion 5, can be reduced, thereby improving the maneuverability of the toothbrush 1 in the oral cavity.
  • the length Lm of the fitting portion 15 is preferably 20 mm or less. This makes it possible to suppress an increase in the bending of the fitting portion 15 in the thickness direction, thereby improving the operability of the toothbrush 1.
  • the thickness T2 of the second neck portion P2 is preferably 5 mm or less. This prevents the stiffness of the portion of the neck portion 13 between the first neck portion P1 and the second neck portion P2 from becoming too large, thereby preventing an increase in the deflection of the head portion 5 in the thickness direction. This improves the operability of the toothbrush 1.
  • the width of the second neck portion P2 is 5 mm or less. This makes it possible to prevent the rigidity of the portion between the first neck portion P1 and the second neck portion P2 from increasing, thereby preventing an increase in the deflection in the thickness direction of the head portion 5. This improves the operability of the toothbrush 1.
  • the third neck portion P3 is located further rearward than the first neck portion P1, i.e., on the other side in the long axis direction (-X side).
  • the distance between the first neck portion P1 and the third neck portion P3 is the same as the length Lm of the fitting portion 15, i.e., twice the dimension in the long axis direction.
  • the distance between the second neck portion P2 and the third neck portion P3 is the same as the length Lm of the fitting portion 15.
  • the neck portion 13 has a third neck portion P3, and when the thickness of the first neck portion P1 is T1, the thickness of the third neck portion P3 is T3, and the maximum thickness of the fitting portion 15 is Tm, the relationship (T3-T1)/Tm ⁇ 1.5 is satisfied. Therefore, the difference between the thickness T3 of the third neck portion P3, which is located on the rear end side by twice the length Lm of the fitting portion 15 from the first neck portion P1, and the thickness T1 of the first neck portion P1 can be made small. This makes it possible to prevent the stiffness in the thickness direction of the portion of the neck portion 13 between the first neck portion P1 and the third neck portion P3 from becoming too large compared to the stiffness in the thickness direction of the head portion 5.
  • the force applied to the head portion 5 can be more suitably absorbed by the bending of the portion of the neck portion 13 between the first neck portion P1 and the third neck portion P3. This further reduces the stress applied to the base of the fitting portion 15, and therefore more effectively prevents the bending of the fitting portion 15 in the thickness direction from increasing. Therefore, even when a brush portion 20 molded from a soft resin is used, the head portion 5 can be made thinner while more effectively preventing the bending of the head portion 5 from increasing. This further improves the operability of the toothbrush 1, and also improves the followability of the brush portion 20, and more effectively prevents the hygiene of the toothbrush 1 from decreasing.
  • (T3-T1)/Tm may be referred to as the second ratio.
  • the second ratio is 1.3 or less.
  • the stiffness in the thickness direction of the portion of the neck portion 13 between the first neck portion P1 and the third neck portion P3 can be more effectively prevented from becoming too large, so that the force applied to the head portion 5 can be further absorbed by the bending of the neck portion 13 in the thickness direction. Therefore, the bending of the head portion 5 can be more effectively prevented from increasing, and the operability of the toothbrush 1 can be further improved.
  • the thickness T3 of the third neck portion P3 is preferably 8 mm or less, and more preferably 7 mm or less. This prevents the stiffness of the portion of the neck portion 13 between the first neck portion P1 and the third neck portion P3 from becoming too large, and further absorbs the force applied to the head portion 5 due to the bending of the neck portion 13. This makes it possible to more suitably prevent the bending of the head portion 5 from increasing, thereby further improving the operability of the toothbrush 1.
  • the relationship T1 ⁇ 2.5 ⁇ Tm is satisfied. Therefore, the maximum thickness Tm of the fitting portion 15 can be prevented from becoming too thin compared to the thickness of the neck portion 13, and the rigidity of the fitting portion 15 in the thickness direction can be prevented from becoming too small. Therefore, the deflection of the head portion 5 in the thickness direction can be prevented from increasing, and therefore the operability of the toothbrush 1 can be more suitably improved, the tracking ability of the brush portion 20 can be more suitably improved, and further, the hygiene of the toothbrush 1 can be more suitably prevented from decreasing.
  • the thickness T1 of the first neck portion P1 and the maximum thickness Tm of the fitting portion 15 satisfy the relationship T1 ⁇ 2.0 ⁇ Tm. This more effectively prevents the head portion 5 from bending in the thickness direction, and more effectively improves the operability of the toothbrush 1.
  • the thickness of the first neck portion P1 is T1 and the maximum thickness of the brush base portion 21, i.e., the maximum dimension in the thickness direction, is Tb, the relationship T1 ⁇ Tb is satisfied. Therefore, the thickness of the neck portion 13 can be prevented from becoming too thick, and the stiffness of the neck portion 13 in the thickness direction can be prevented from becoming too high relative to the stiffness of the head portion 5 in the thickness direction. Therefore, the deflection of the head portion 5 in the thickness direction can be more effectively prevented from increasing, and the operability of the toothbrush 1 can be more effectively improved.
  • the maximum thickness Tb of the brush base 21 is preferably 3.5 mm or more and 4.5 mm or less. If the maximum thickness Tb of the brush base 21 is less than 3.5 mm, the stiffness of the brush base 21 in the thickness direction becomes too small, and the brush part 20 is likely to bend in the thickness direction when the toothbrush 1 is in use. If the maximum thickness Tb of the brush base 21 is greater than 4.5 mm, it is difficult to make the head part 5 thinner. In this embodiment, by setting the maximum thickness Tb of the brush base 21 to 3.5 mm or more and 4.5 mm or less, it is possible to suppress an increase in the bending in the thickness direction of the brush part 20 and to make the head part 5 thinner. Therefore, the operability of the toothbrush 1 can be improved.
  • the fourth neck portion P4 is located further back than the first neck portion P1, i.e., on the other side (-X side) in the longitudinal direction.
  • the fourth neck portion P4 is located between the second neck portion P2 and the third neck portion P3 in the longitudinal direction.
  • the position of the fourth neck portion P4 is not limited to this, and it may be located further forward than the second neck portion P2, or further back than the third neck portion P3.
  • the thickness T4 of the fourth neck portion P4 is the same dimension as the maximum thickness Tb of the brush base portion 21.
  • the distance L3 between the rear end side end of the fitting portion 15 and the fourth neck portion P4 is longer than the length Lb of the brush portion 20.
  • the distance L3 between the rear end of the fitting portion 15 and the fourth neck portion P4 is preferably 20 mm or more. If the distance L3 between the rear end of the fitting portion 15 and the fourth neck portion P4 is less than 20 mm, the tip side of the neck portion 13, i.e., the part of the neck portion 13 close to the fitting portion 15, is easily bent in the thickness direction, making it difficult to reduce the stress applied to the base of the fitting portion 15.
  • the neck portion 13 can be easily bent in the thickness direction up to the part far away from the fitting portion 15 to the rear end side, so that the stress applied to the base of the fitting portion 15 can be further reduced. Therefore, the bending of the head portion 5 in the thickness direction can be more effectively suppressed, and the operability of the toothbrush 1 can be more effectively improved.
  • the ratio of the distance L3 between the rear end of the fitting portion 15 and the fourth neck portion P4 to the distance L1 between the rear end of the fitting portion 15 and the rear end of the neck portion 13 is 40% or more. This makes it possible to more suitably increase the length of the portion of the neck portion 13 that is thinner than the maximum thickness Tb of the brush base portion 21. Therefore, when the toothbrush 1 is in use, the length of the portion of the neck portion 13 that bends in the thickness direction can be increased, thereby further reducing the stress applied to the base of the fitting portion 15. Therefore, it is possible to more suitably suppress an increase in the bending of the head portion 5 in the thickness direction, thereby more suitably improving the operability of the toothbrush 1.
  • the ratio of the distance L4 between the rear end of the fitting portion 15 and the first neck portion P1 to the distance L1 between the rear end of the fitting portion 15 and the rear end of the neck portion 13 is 10% or more and 60% or less. It is even more preferable that the ratio of the distance L4 between the rear end of the fitting portion 15 and the first neck portion P1 to the distance L1 between the rear end of the fitting portion 15 and the rear end of the neck portion 13 is 10% or more and 30% or less.
  • the first neck portion P1 can be positioned close to the rear end of the fitting portion 15, so that when the toothbrush 1 is used, the part of the neck portion 13 close to the fitting portion 15 bends in the thickness direction, and the stress applied to the base of the fitting portion 15 can be further reduced. Therefore, it is possible to more suitably suppress the increase in the bending in the thickness direction of the head portion 5, and the operability of the toothbrush 1 can be more suitably improved.
  • connection part 14 has a maximum thickness Tk of the connection part 14, i.e., the maximum dimension in the thickness direction, at the tip end of the connection part 14.
  • the thickness of the first neck portion P1 is T1 and the maximum thickness of the connection portion 14 is Tk
  • the relationship T1 ⁇ Tk is satisfied. Therefore, the thickness of the neck portion 13 can be prevented from becoming too thick relative to the connection portion 14 that constitutes the head portion 5, and therefore the stiffness in the thickness direction of the neck portion 13 can be prevented from becoming too high relative to the stiffness in the thickness direction of the head portion 5. Therefore, the bending of the head portion 5 in the thickness direction can be prevented from increasing, and the operability of the toothbrush 1 can be more suitably improved.
  • the ratio of the length Ln of the neck portion 13 to the distance L5 between the tip side of the head portion 5, i.e., the end on one side (+X side) in the longitudinal direction, and the rear end side of the neck portion 13, i.e., the end on the other side (-X side) in the longitudinal direction, is 60% or more.
  • the distance L5 from the tip of the head portion 5 to the rear end of the neck portion 13 is specified within a predetermined range from the viewpoint of usability of the toothbrush 1.
  • the length Ln of the neck portion 13 can be made relatively long with respect to the length Lh of the head portion 5.
  • the toothbrush 1 when the toothbrush 1 is in use, it is easy to increase the bending of the neck portion 13 in the thickness direction, and therefore it is easy to absorb the force applied to the head portion 5 due to such bending. Therefore, it is possible to more suitably suppress an increase in the bending of the head portion 5 in the thickness direction, and therefore it is possible to more suitably improve the operability of the toothbrush 1.
  • the ratio of the length Ln of the neck portion 13 to the distance L5 between the tip end of the head portion 5 and the rear end of the neck portion 13 is less than 60%, the length Ln of the neck portion 13 becomes too short relative to the length Lb of the head portion 5, and the bending of the neck portion 13 tends to become small when the toothbrush 1 is in use. Therefore, the bending of the head portion 5 tends to increase.
  • the ratio of the length Lm of the fitting portion 15 to the length Lb of the brush portion 20 is 80% or more. This increases the contact area between the inner surface of the fitting hole 27 of the brush portion 20 and the outer surface of the fitting portion 15, thereby increasing the frictional force between the brush portion 20 and the fitting portion 15. This prevents the brush portion 20 from moving in the longitudinal direction relative to the handle body 10, thereby further improving the tracking ability of the brush portion 20 and more effectively preventing a decrease in hygiene of the toothbrush 1.
  • the brush part 20 When the brush part 20 is molded by insert molding using the handle body 10 as an insert member, the joining area between the inner surface of the fitting hole 27 of the brush part 20 and the outer surface of the fitting part 15 can be increased, thereby increasing the joining strength between the brush part 20 and the fitting part 15. Therefore, as described above, the brush part 20 can be prevented from moving in the longitudinal direction relative to the handle body 10, which can further improve the tracking ability of the brush part 20 and more effectively prevent the hygiene of the toothbrush 1 from decreasing.
  • the fifth neck portion P5 is located further rearward than the first neck portion P1, i.e., on the other side (-X side) in the longitudinal direction.
  • the fifth neck portion P5 is located between the third neck portion P3 and the second boundary portion 13b in the longitudinal direction.
  • the position of the fifth neck portion P5 is not limited to this, and it may be located further forward than the third neck portion P3.
  • the width W1 of the first neck portion P1 i.e., the width dimension
  • the width W5 of the fifth neck portion P5 is the same as the maximum width Wm of the fitting portion 15, and the distance L2 between the first neck portion P1 and the fifth neck portion P5 in the long axis direction is equal to or greater than the length Lh of the head portion 5.
  • the width between the first neck portion P1 and the fifth neck portion P5 of the neck portion 13 can be made narrower than the maximum width Wm of the fitting portion 15, so that the widthwise rigidity of the portion between the first neck portion P1 and the fifth neck portion P5 of the neck portion 13 can be made smaller relative to the widthwise rigidity of the fitting portion 15. Therefore, when a force in the width direction is applied to the head portion 5 during use of the toothbrush 1, the portion of the neck portion 13 between the first neck portion P1 and the fifth neck portion P5 is largely deflected in the width direction, and the force in the width direction applied to the head portion 5 can be absorbed by this deflection.
  • the toothbrush 1 of this embodiment even when the brush portion 20 is made of a soft resin, it is possible to reduce the thickness of the head portion 5 while preventing the deflection of the head portion 5 from increasing.
  • Examples 1 to 8, Comparative Example 1 According to the specifications shown in Table 1, the samples of Examples 1 to 8 and Comparative Example 1 were toothbrushes in which at least one of the above-mentioned first neck portion thickness (minimum thickness of the neck portion); T1, maximum thickness of the fitting portion; Tm, length of the fitting portion; Lm, thickness of the second neck portion; T2, first ratio; (T2-T1)/Tm, thickness of the third neck portion; T3, second ratio; (T3-T1)/Tm, ratio of the thickness of the first neck portion to the maximum thickness of the fitting portion; T1/Tm, maximum thickness of the brush base portion; Tb, and ratio of the maximum thickness of the brush base portion to the thickness of the first neck portion; Tb/T1 were different.
  • first neck portion thickness minimum thickness of the neck portion
  • Tm maximum thickness of the fitting portion
  • Tm length of the fitting portion
  • Lm thickness of the second neck portion
  • T2 first ratio
  • T2-T1)/Tm thickness of the third neck portion
  • the length Lh of the head part of each sample was 21 mm.
  • the maximum width of the head part of each sample was 11 mm.
  • the maximum width Wm of the fitting part of each sample was 8 mm.
  • the hard resin constituting the handle body of each sample was polyacetal resin (POM).
  • the soft resin constituting the brush part of each sample was polyurethane resin (PU).
  • the minimum width of the neck part of each sample was 4.5 mm.
  • the length Ln of the neck part of each sample was 48.5 mm.
  • the length of the connection part of each sample was 7.5 mm.
  • the filaments of each sample were arranged as shown in Figure 5.
  • the number of filaments of each sample was 149.
  • the hair length of the filaments of each sample was 10.0 mm.
  • the cross-sectional shape of the base of the filaments of each sample perpendicular to the thickness direction was a triangle with a base dimension of 0.90 mm and a height of 0.70 mm.
  • the side view shape of the filaments of each sample was the shape shown in Figure 6.
  • Example 2 Compared to the configuration of Example 1, Example 2, in which the first ratio (T2-T1)/Tm is smaller than 0.4, is rated equivalent to Example 1 on a 5-point scale, but the average score given by 10 expert panelists was better than that of Example 1. This is because Example 2 allows for greater deflection in the thickness direction from the first neck portion to the second neck portion than Example 1, which in turn allows for more effective suppression of deflection in the thickness direction of the head portion.
  • Example 3 Compared to the configuration of Example 2, Example 3, in which the second ratio (T3-T1)/Tm was smaller than 1.5, gave better results than Example 2. This is because Example 3 allows for a greater deflection in the thickness direction from the first neck portion to the third neck portion than Example 2, and therefore more effectively suppresses deflection in the thickness direction of the head portion. Furthermore, compared to the configuration of Example 3, Example 4, in which the second ratio (T3-T1)/Tm was smaller than 1.3, gave better results than Example 3 for the same reason.
  • Example 5 Compared to the configuration of Example 4, Example 5, in which the ratio T1/Tm of the thickness of the first neck portion to the maximum thickness of the mating portion is 2.5 or less, produced better results than Example 4. This is because Example 5 is able to prevent the maximum thickness of the mating portion from becoming too thin compared to Example 4, and therefore the deflection of the head portion is more suitably reduced. Furthermore, compared to the configuration of Example 5, Example 6, in which the ratio T1/Tm of the thickness of the first neck portion to the maximum thickness of the mating portion is 2.0 or less, produced better results than Example 5 for the same reason.
  • Example 7 Compared to the configuration of Example 6, Example 7, in which the ratio Tb/T1 of the maximum thickness of the brush base to the thickness of the first neck portion is greater than 1.0, produced better results than Example 6. This is because, compared to Example 6, Example 7 is able to prevent the neck portion from becoming too thick relative to the maximum thickness of the brush base, allowing for greater deflection of the neck portion in the thickness direction, which in turn reduces the deflection of the head portion more effectively.
  • Example 8 Compared to the configuration of Example 7, Example 8, in which the second ratio (T3-T1)/Tm is 1.0 or less, the ratio T1/Tm of the thickness of the first neck portion to the maximum thickness of the fitting portion is less than 2.0, and the ratio Tb/T1 of the maximum thickness of the brush base portion to the thickness of the first neck portion is greater than 1.1, provided better results than Example 7.
  • the configuration of the fitting portion and fitting hole is not limited to that of this embodiment, and may be, for example, a configuration in which the fitting portion has a protrusion that protrudes in the width direction, and the fitting hole is recessed in the width direction and has a recess that fits with the protrusion.
  • a configuration in which the handle body is formed from a hard resin is exemplified, but this is not limited to this configuration, and for example, a configuration in which a part of the handle body, such as the handle portion, is covered with a soft resin is also possible. In this case, the decorativeness and gripping properties of the toothbrush can be improved.
  • the toothbrush according to the present invention even when using a brush part molded from soft resin, can reduce the thickness of the head part while preventing the head part from bending too much, and can therefore prevent molding defects from occurring in the brush molded body, making it suitable for use as a thin-head type toothbrush.

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0611527U (ja) * 1992-04-06 1994-02-15 政▲いち▼ 大畑 歯ブラシ
WO2018079115A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ
WO2021131526A1 (ja) * 2019-12-23 2021-07-01 ライオン株式会社 歯ブラシ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61207233A (ja) 1985-03-13 1986-09-13 Kubota Ltd 走行装置
GB9511909D0 (en) 1995-06-12 1995-08-09 Microbiological Res Authority Vaccine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0611527U (ja) * 1992-04-06 1994-02-15 政▲いち▼ 大畑 歯ブラシ
WO2018079115A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ
WO2021131526A1 (ja) * 2019-12-23 2021-07-01 ライオン株式会社 歯ブラシ

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