JP6963330B2 - toothbrush - Google Patents

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JP6963330B2
JP6963330B2 JP2020074537A JP2020074537A JP6963330B2 JP 6963330 B2 JP6963330 B2 JP 6963330B2 JP 2020074537 A JP2020074537 A JP 2020074537A JP 2020074537 A JP2020074537 A JP 2020074537A JP 6963330 B2 JP6963330 B2 JP 6963330B2
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reinforcing
toothbrush
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JP2021171077A (en
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昌之 高橋
智子 元山
洋介 久保
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Pias Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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Description

本発明は、歯ブラシ、特に、奥歯の磨き易さを向上させるように構成された歯ブラシに関する。 The present invention relates to toothbrushes, in particular toothbrushes configured to improve the ease of brushing molars.

上記歯ブラシとして、例えば、特許文献１に開示されているような、厚みが薄い小型のヘッド（歯ブラシヘッド部）を備えた歯ブラシが知られている。 As the toothbrush, for example, a toothbrush having a small head (toothbrush head portion) having a thin thickness as disclosed in Patent Document 1 is known.

かかる歯ブラシによれば、歯ブラシヘッド部が小型であるから、歯ブラシの先端側を口に挿し込んだ際に歯ブラシヘッド部が奥歯の手前側の歯等に干渉し難くなるため、歯ブラシヘッド部が奥歯に届き易くなり、毛束が奥歯に当たり易くなる。 According to such a toothbrush, since the toothbrush head portion is small, when the tip side of the toothbrush is inserted into the mouth, the toothbrush head portion does not easily interfere with the teeth on the front side of the back teeth, so that the toothbrush head portion is the back teeth. It becomes easier for the hair bundle to reach the back teeth.

このように、上記構成の歯ブラシは、奥歯への毛束の当て易さを高めることで、奥歯の磨き易さを向上させることができるようになっている。 As described above, the toothbrush having the above configuration can improve the ease of brushing the back teeth by increasing the ease of applying the hair bundle to the back teeth.

特開２０１３−３４７１８号公報Japanese Unexamined Patent Publication No. 2013-34718

ところで、上記従来の歯ブラシにおいて、歯ブラシヘッド部は、厚みを薄くしている分剛性が低くなっているため、毛束を歯に押し付けた際に歯ブラシヘッド部がネックに対して外側に反るようにして撓んでしまうことがある。 By the way, in the above-mentioned conventional toothbrush, the toothbrush head portion has a lower rigidity due to the thinner thickness, so that the toothbrush head portion warps outward with respect to the neck when the hair bundle is pressed against the tooth. It may bend.

この場合、使用者が歯ブラシに込めた力は、毛束に伝わる前に歯ブラシヘッド部の撓みによって減少してしまうため、毛束が奥歯に当たっていても、奥歯の汚れを落とせないことがある。 In this case, the force applied to the toothbrush by the user is reduced by the bending of the toothbrush head portion before being transmitted to the hair bundle, so that even if the hair bundle hits the back teeth, it may not be possible to remove the dirt on the back teeth.

そこで、本発明は、かかる実情に鑑み、奥歯をしっかりと磨くことができる歯ブラシの提供を課題とする。 Therefore, in view of such circumstances, it is an object of the present invention to provide a toothbrush capable of firmly brushing molars.

本発明の歯ブラシは、
棒状のハンドル部と、
ハンドル部の長手方向における前端から延出するネック部と、
該ネック部の長手方向における前端につながる板状のヘッド部と、
該ヘッド部における厚み方向内側の植毛面に立設された複数の毛によって構成される刷掃部と、
前記ネック部の前記前端から、前記ヘッド部における厚み方向外側の背面の基端側に重なるようにして延出する補強部と、を備え、
前記ヘッド部は、厚みが２〜４ｍｍに設定され、且つ横幅が前記ハンドル部の横幅よりも小さくなるように設定されるとともに、前記植毛面の先端が前記植毛面の基端よりも厚み方向内側に位置するように前記ハンドル部の軸線に対して８°〜１４°傾くように形成され、
前記ネック部は、厚みと横幅が前記ハンドル部よりも小さく設定され、且つ前記前端が前記軸線よりも厚み方向内側に位置するようにして湾曲し、
前記補強部は、横幅方向において前記ネック部の前記前端よりも外側に広がる幅広部であって、前記ヘッド部の前記背面の前記刷掃部の後端よりも前後方向前方側の領域に重なるように形成された幅広部を有する。 The toothbrush of the present invention
With a rod-shaped handle
A neck part extending from the front end in the longitudinal direction of the handle part,
A plate-shaped head portion connected to the front end in the longitudinal direction of the neck portion,
A sweeping portion composed of a plurality of hairs erected on the flocked surface on the inner side in the thickness direction of the head portion.
A reinforcing portion extending from the front end of the neck portion so as to overlap the base end side of the back surface on the outer side in the thickness direction of the head portion is provided.
The thickness of the head portion is set to 2 to 4 mm, the width is set to be smaller than the width of the handle portion, and the tip of the flocked surface is inside the base end of the flocked surface in the thickness direction. It is formed so as to be tilted by 8 ° to 14 ° with respect to the axis of the handle portion so as to be located at.
The neck portion is curved so that the thickness and width are set smaller than the handle portion and the front end is located inside in the thickness direction with respect to the axis.
The reinforcing portion is a wide portion that extends outward from the front end of the neck portion in the lateral width direction, and overlaps the region on the front side in the front-rear direction with respect to the rear end of the sweep portion on the back surface of the head portion. It has a wide portion formed.

上記構成の歯ブラシでは、ヘッド部が、厚み２〜４ｍｍであり、且つ横幅が前記ハンドル部の横幅よりも小さくなるように形成された、厚みと横幅が小さい小型のものであるため、歯ブラシを口に挿し込んだ際にヘッド部が歯と頬の間に入り易くなっている。 In the toothbrush having the above configuration, the head portion is a small one having a thickness of 2 to 4 mm and a width smaller than the width of the handle portion, and the thickness and width are small. The head part is easy to get between the teeth and cheeks when it is inserted into.

また、ヘッド部は、湾曲するネック部の前端に連続し、且つハンドル部の軸線よりも厚み方向内側に位置するとともに、植毛面の基端よりも先端の方が前記厚み方向内側に位置するように８°〜１４°傾いているため、ヘッド部を歯の並びに沿わせて口の奥まで進入させ易くなっている。 Further, the head portion is continuous with the front end of the curved neck portion and is located inside the axis of the handle portion in the thickness direction, and the tip portion is located inside the thickness direction of the base end of the flocked surface. Since it is tilted by 8 ° to 14 °, it is easy to move the head part along the line of teeth to the back of the mouth.

このように、上記構成の歯ブラシは、ヘッド部を口の奥深くまで進入させ易くすることによって、刷掃部の毛先を奥歯の後ろ側に回り込ませ易くなっている。 As described above, the toothbrush having the above configuration makes it easy for the head portion to penetrate deep into the mouth so that the bristles of the brush portion can easily wrap around behind the back teeth.

さらに、ヘッド部の基端部の背面にはネック部の前端から延出する補強部が幅広く重なっているため、ヘッド部の基端部は、厚みが増すことによって剛性が高められている。そのため、毛束を歯に押し付けた際にネック部に対するヘッド部の撓みを防止することができ、これにより、使用者によって歯ブラシに込められた力の減少を抑えたうえで、この力を刷掃部に伝えることができる。従って、上記構成の歯ブラシによれば、刷掃部の毛を奥歯の裏側まで届かせたうえで、奥歯全体を刷掃部によって十分な力で磨くことができる。 Further, since the reinforcing portion extending from the front end of the neck portion is widely overlapped on the back surface of the base end portion of the head portion, the rigidity of the base end portion of the head portion is increased by increasing the thickness. Therefore, it is possible to prevent the head portion from bending with respect to the neck portion when the hair bundle is pressed against the teeth, thereby suppressing a decrease in the force applied to the toothbrush by the user and then applying this force to the wiping portion. Can be told to. Therefore, according to the toothbrush having the above configuration, the bristles of the brushing portion can reach the back side of the back teeth, and then the entire back teeth can be brushed with sufficient force by the brushing portion.

以上のように、上記構成の歯ブラシは、奥歯の裏側であっても刷掃部の毛を当てて汚れを落とし易くすることによって、奥歯の磨き残しを減らすことができるようになっている。 As described above, the toothbrush having the above configuration can reduce the amount of unpolished back teeth by applying the bristles of the brushing portion to make it easier to remove dirt even on the back side of the back teeth.

本発明の歯ブラシにおいて、
前記ネック部の長手方向における寸法は、６０．０ｍｍ〜７０．０ｍｍに設定されていてもよい。 In the toothbrush of the present invention
The dimension of the neck portion in the longitudinal direction may be set to 60.0 mm to 70.0 mm.

上記構成の歯ブラシによれば、奥歯の裏側、口腔内の奥側の歯列に刷掃部の毛を当てることが容易となる。 According to the toothbrush having the above configuration, it becomes easy to apply the bristles of the brushing portion to the dentition on the back side of the back teeth and the back side in the oral cavity.

本発明の歯ブラシにおいて、
前記刷掃部の毛の毛丈は、９．０ｍｍ〜１３．０ｍｍに設定されていてもよい。 In the toothbrush of the present invention
The hair length of the sweeping portion may be set to 9.0 mm to 13.0 mm.

上記構成の歯ブラシによれば、歯や歯茎に刷掃部の毛が当たった際、毛腰が硬すぎず、且つ柔らかすぎない適度なブラッシング圧が得られる。 According to the toothbrush having the above configuration, when the bristles of the brushing portion hit the teeth or gums, an appropriate brushing pressure that is not too hard and not too soft can be obtained.

本発明の歯ブラシにおいて、
前記ヘッド部の前記背面から前記刷掃部の刷掃面までの寸法は、１１．０ｍｍ〜１７．０ｍｍに設定されていてもよい。 In the toothbrush of the present invention
The dimension from the back surface of the head portion to the sweep surface of the sweeping portion may be set to 11.0 mm to 17.0 mm.

上記構成の歯ブラシによれば、奥歯の裏側や、歯列と口唇部や頬の裏側等、口腔内の狭い箇所において刷掃部の毛先を歯と歯茎に当て易くなる。 According to the toothbrush having the above configuration, it becomes easy to apply the bristles of the brushed portion to the teeth and gums in a narrow place in the oral cavity such as the back side of the back teeth, the dentition and the back side of the lips, and the back side of the cheeks.

本発明の歯ブラシにおいて、
前記ヘッド部の前記背面から前記刷掃部の刷掃面までの寸法は、前記厚み方向における前記ネック部の基端の位置から先端の位置までの距離以下に設定されていてもよい。 In the toothbrush of the present invention
The dimension from the back surface of the head portion to the sweep surface of the sweep portion may be set to be equal to or less than the distance from the position of the base end to the position of the tip end of the neck portion in the thickness direction.

上記構成の歯ブラシによれば、ヘッド部や、ネック部が歯から離れにくくなるため、ヘッド部を口の奥に進入させ易くなる。 According to the toothbrush having the above configuration, the head portion and the neck portion are difficult to separate from the teeth, so that the head portion can be easily inserted into the back of the mouth.

以上のように、本発明の歯ブラシは、奥歯をしっかりと磨くことができるという優れた効果を奏し得る。 As described above, the toothbrush of the present invention can exert an excellent effect that the back teeth can be brushed firmly.

図１は、本発明の一実施形態に係る歯ブラシの斜視図である。FIG. 1 is a perspective view of a toothbrush according to an embodiment of the present invention. 図２は、同実施形態に係る歯ブラシの側面図である。FIG. 2 is a side view of the toothbrush according to the embodiment. 図３は、同実施形態に係る歯ブラシの背面図である。FIG. 3 is a rear view of the toothbrush according to the embodiment. 図４は、同実施形態に係る歯ブラシのヘッド部を背面側から見た拡大図である。FIG. 4 is an enlarged view of the head portion of the toothbrush according to the embodiment as viewed from the back side. 図５は、同実施形態に係る歯ブラシのヘッド部を植毛面側から見た拡大図である。FIG. 5 is an enlarged view of the head portion of the toothbrush according to the embodiment as viewed from the flocked surface side. 図６は、同実施形態に係る歯ブラシのヘッド部を正面から見た拡大図である。FIG. 6 is an enlarged view of the head portion of the toothbrush according to the embodiment as viewed from the front. 図７は、同実施形態に係る歯ブラシの側面拡大図である。FIG. 7 is an enlarged side view of the toothbrush according to the embodiment. 図８は、歯の説明図である。FIG. 8 is an explanatory diagram of teeth.

以下、本発明の一実施形態にかかる歯ブラシについて、添付図面を参照しつつ説明する。本実施形態に係る歯ブラシは、特に、奥歯の磨き易さを向上させるように構成されたものであり、より具体的に説明すると、図８に示すような、奥歯Ｔの外側Ｔ１よりも奥側に位置する裏側Ｔ２を磨き易き易さを向上させたものである。 Hereinafter, a toothbrush according to an embodiment of the present invention will be described with reference to the accompanying drawings. The toothbrush according to the present embodiment is particularly configured to improve the ease of brushing the back teeth, and more specifically, as shown in FIG. 8, the back side of the back teeth T on the outer side T1. The back side T2 located in is improved in ease of polishing.

本実施形態に係る歯ブラシ１は、図１に示すように、使用者が握るハンドル部２と、ハンドル部２の長手方向における前端から延出するネック部３と、該ネック部３の長手方向における前端につながる板状のヘッド部４と、該ヘッド部４の厚み方向内側に位置する植毛面４０に立設された複数の毛によって構成される刷掃部５と、前記ネック部３の前記前端から、前記ヘッド部４の背面４１の基端側に重なるようにして延出する補強部６と、を備えている。 As shown in FIG. 1, the toothbrush 1 according to the present embodiment has a handle portion 2 gripped by the user, a neck portion 3 extending from the front end of the handle portion 2 in the longitudinal direction, and a neck portion 3 in the longitudinal direction. From the plate-shaped head portion 4 connected to the front end, the sweeping portion 5 composed of a plurality of hairs erected on the flocked surface 40 located inside the head portion 4 in the thickness direction, and the front end of the neck portion 3. A reinforcing portion 6 extending so as to overlap the base end side of the back surface 41 of the head portion 4 is provided.

ハンドル部２は、棒状である。本実施形態では、図２に示すように、ハンドル部２の軸線をハンドル軸線Ａと称する（図７参照）。 The handle portion 2 has a rod shape. In the present embodiment, as shown in FIG. 2, the axis of the handle portion 2 is referred to as a handle axis A (see FIG. 7).

ネック部３は、厚み方向外側に向かって凸状に湾曲している。なお、ネック部３では、厚み方向における内面と背面の両方が厚み方向外側に向かって湾曲している。 The neck portion 3 is curved in a convex shape toward the outside in the thickness direction. In the neck portion 3, both the inner surface and the back surface in the thickness direction are curved toward the outside in the thickness direction.

ネック部３の頂部（最も厚み方向外側に位置している部分）は、該ネック部３の長手方向における中央領側の域内に位置しており、本実施形態では、この中央側の領域内であり且つ該ネック部３の中央位置よりも前端側に位置している。さらに、ネック部３の頂部は、厚み方向においては補強部６よりも外側に位置している（図６参照）。 The top of the neck portion 3 (the portion located on the outermost side in the thickness direction) is located in the region on the central territory side in the longitudinal direction of the neck portion 3, and in the present embodiment, within the region on the central side. And it is located on the front end side of the center position of the neck portion 3. Further, the top of the neck portion 3 is located outside the reinforcing portion 6 in the thickness direction (see FIG. 6).

ネック部３の前端は、ネック部３の基端よりも厚み方向内側に位置している。そのため、ネック部３の基端がハンドル軸線Ａ上に位置している一方で、ネック部３の先端は、ハンドル軸線Ａよりも厚み方向内側に位置している。 The front end of the neck portion 3 is located inside the base end of the neck portion 3 in the thickness direction. Therefore, while the base end of the neck portion 3 is located on the handle axis A, the tip of the neck portion 3 is located inside the handle axis A in the thickness direction.

ネック部３の横幅は、基端が最も広くなっており、基端から先端に向かうにつれて徐々に小さくなっている（図３参照）。 The width of the neck portion 3 is widest at the base end and gradually decreases from the base end toward the tip end (see FIG. 3).

ヘッド部４は、図４に示すように、ネック部３から延出するヘッド基部４２と、ヘッド基部４２の前端に連続するヘッド中部４３と、ヘッド中部４３の前端にさらに連続するヘッド先部４４と、を有する。 As shown in FIG. 4, the head portion 4 includes a head base portion 42 extending from the neck portion 3, a head middle portion 43 continuous with the front end of the head base portion 42, and a head tip portion 44 further continuous with the front end of the head central portion 43. And have.

本実施形態のヘッド部４は、厚み方向から見た形状が長楕円状であるため、ヘッド基部４２の横幅は、基端（ネック部３に連続する一端）から前端側に向かうにつれて徐々に広がっている。また、ヘッド中部４３の横幅は、基端から前端まで一定であり、ヘッド先部４４の横幅は、基端から先端側に向かうにつれて徐々に狭くなっている。 Since the head portion 4 of the present embodiment has an oblong shape when viewed from the thickness direction, the width of the head base portion 42 gradually increases from the base end (one end continuous with the neck portion 3) toward the front end side. ing. Further, the lateral width of the head middle portion 43 is constant from the proximal end to the front end, and the lateral width of the head tip portion 44 gradually narrows from the proximal end toward the distal end side.

これに伴い、ヘッド基部４２の外周側面４２０は、基端から前端側に向かうにつれて横幅方向外側に向かうようにして湾曲しており、ヘッド中部４３の外周側面４３０は、基端から前端側まで前後方向に沿って真っすぐに延びている。また、ヘッド先部４４の外周側面４４０は、基端から先端に向かうにつれて徐々に横幅が小さくなるように形成されており、前後方向前方側に凸となるように湾曲している。なお、図４に図示しているように、ヘッド基部４２の外周側面４２０とヘッド先部４４の外周側面４４０は、横幅方向外側に凸となるように湾曲している。 Along with this, the outer peripheral side surface 420 of the head base 42 is curved so as to be outward in the width direction from the base end toward the front end side, and the outer peripheral side surface 430 of the head middle portion 43 is front and rear from the base end to the front end side. It extends straight along the direction. Further, the outer peripheral side surface 440 of the head tip portion 44 is formed so that the lateral width gradually decreases from the base end to the tip end, and is curved so as to be convex in the front-rear direction. As shown in FIG. 4, the outer peripheral side surface 420 of the head base portion 42 and the outer peripheral side surface 440 of the head tip portion 44 are curved so as to be convex outward in the lateral width direction.

ヘッド部４の厚みは、基端から先端まで一定である。 The thickness of the head portion 4 is constant from the base end to the tip end.

刷掃部５は、図５に示すように、複数の毛を一つに束ねた複数の毛束５０によって構成されている。また、本実施形態の刷掃部５では、複数の毛束５０を前後方向に沿って並べた毛束５０の列が、横幅方向に並べて５つ形成されている。すなわち、本実施形態の歯ブラシ１は、５列タイプの歯ブラシ１である。 As shown in FIG. 5, the sweeping unit 5 is composed of a plurality of hair bundles 50 in which a plurality of hairs are bundled into one. Further, in the scavenging unit 5 of the present embodiment, five rows of hair bundles 50 in which a plurality of hair bundles 50 are arranged along the front-rear direction are formed by arranging them in the width direction. That is, the toothbrush 1 of the present embodiment is a 5-row type toothbrush 1.

刷掃部５は、前後方向における先端部に位置する複数の毛束５０で構成されるつま先部５１と、後端部に位置する複数の毛束５０で構成される踵部５２と、つま先部５１と踵部５２との間で前後方向に沿って一列に並ぶ複数の毛束５０で構成される中部５３と、横幅方向における両側、すなわち、中部５３を境として横幅方向における一方側と他方側とに位置する複数の毛束５０で構成されている一対の脇部５４と、を有する。 The sweeping portion 5 includes a toe portion 51 composed of a plurality of hair bundles 50 located at the tip portion in the front-rear direction, a heel portion 52 composed of a plurality of hair bundles 50 located at the rear end portion, and a toe portion 51. The central portion 53 composed of a plurality of hair bundles 50 arranged in a row along the front-rear direction between the heel portion 52 and the heel portion 52, and both sides in the lateral width direction, that is, one side and the other side in the lateral width direction with the central portion 53 as a boundary. It has a pair of armpits 54, which are composed of a plurality of hair bundles 50 located at.

つま先部５１は、前後幅よりも横幅の方が大きくなるように構成されている。すなわち、つま先部５１は、最も前方の毛束５０の前端から最も後方の毛束５０の後端までの前後幅よりも、横幅方向で最も外側に位置する一方の毛束５０の外端から他方の毛束５０の外端までの横幅の方が大きくなっている。また、つま先部５１は、厚み方向から見た形状が菱形状になっている。 The toe portion 51 is configured so that the lateral width is larger than the front-rear width. That is, the toe portion 51 is located from the outer end of one hair bundle 50 located on the outermost side in the lateral width direction with respect to the front-rear width from the front end of the frontmost hair bundle 50 to the rear end of the rearmost hair bundle 50. The width to the outer end of the hair bundle 50 is larger. Further, the toe portion 51 has a diamond shape when viewed from the thickness direction.

踵部５２も、つま先部５１と同様に、前後幅よりも横幅の方が大きくなるように構成されており、また、厚み方向から見た形状が菱形状になっている。 Like the toe portion 51, the heel portion 52 is also configured so that the lateral width is larger than the front-rear width, and the shape seen from the thickness direction is a rhombus shape.

脇部５４には、毛束５０の列が複数含まれており、また、横幅方向外側の毛束５０の列は、横幅方向内の毛束５０の列に対して前後方向後方側にずれた位置に配置されている。そのため、脇部５４の前端と後端とは、横幅方向外側に向かうにつれて前後方向後方側に向かうように傾いている。なお、踵部５２の前端と、脇部５４の後端とは、互いに平行又は略平行に形成されている。 The armpit 54 includes a plurality of rows of hair bundles 50, and the rows of hair bundles 50 on the outer side in the width direction are displaced rearward in the front-rear direction with respect to the rows of hair bundles 50 in the width direction. It is placed in position. Therefore, the front end and the rear end of the side portion 54 are inclined toward the rear side in the front-rear direction toward the outside in the width direction. The front end of the heel portion 52 and the rear end of the side portion 54 are formed to be parallel to or substantially parallel to each other.

複数の毛束５０には、構成している毛の種類（材質や形状）が異なる２種類の毛束５０Ａ、５０Ｂが含まれており、つま先部５１、踵部５２、中部５３を構成する毛束５０Ａの毛と、脇部５４を構成する毛束５０Ｂの毛は、それぞれ種類が異なるものとなっている。 The plurality of hair bundles 50 include two types of hair bundles 50A and 50B having different types (materials and shapes) of the constituent hairs, and the hairs constituting the toe portion 51, the heel portion 52, and the middle portion 53. The hair of the bundle 50A and the hair of the hair bundle 50B constituting the armpit 54 are of different types.

つま先部５１、踵部５２、中部５３を構成する毛束５０の毛は、例えば、ポリブチレンテレフタレート製であり、ラウンドテーパー形状であり、脇部５４を構成する毛束５０の毛は、例えば、ポリブチレンテレフタレート製であればよい。 The hair of the hair bundle 50 constituting the toe portion 51, the heel portion 52, and the middle portion 53 is made of, for example, polybutylene terephthalate and has a round taper shape, and the hair of the hair bundle 50 constituting the side portion 54 is, for example, It may be made of polybutylene terephthalate.

補強部６は、図４に示すように、横幅（横幅方向の寸法）がネック部３の先端（ネック部３の先端の幅）よりも広い幅広部と、横幅がネック部３の先端よりも狭い幅狭部と、を有する。 As shown in FIG. 4, the reinforcing portion 6 has a wide portion whose width (dimension in the width direction) is wider than the tip of the neck portion 3 (width of the tip of the neck portion 3) and a width of which is wider than the tip of the neck portion 3. It has a narrow narrow portion.

また、補強部６には、前後方向を基準とすれば、横幅が最も広い最大幅部６０よりも前後方向前方側に位置する補強前側領域６１と、該最大幅部６０よりも前後方向後方側に位置する補強後側領域６２とが含まれている。 Further, the reinforcing portion 6 has a reinforcing front side region 61 located on the front side in the front-rear direction with respect to the maximum width portion 60 having the widest width and a rear side in the front-rear direction with respect to the maximum width portion 60, based on the front-rear direction. Includes a reinforced rear region 62 located at.

補強前側領域６１では、前後方向前方側に向かうにつれて横幅が徐々に狭くなり、厚みも前後方向前方側に向かうにつれて徐々に狭くなっている。 In the reinforcement front side region 61, the lateral width gradually narrows toward the front side in the front-rear direction, and the thickness also gradually narrows toward the front side in the front-rear direction.

補強後側領域６２では、前後方向後方側に向かうにつれて横幅が徐々に狭くなり、且つ基端の横幅がネック部３の先端と同じ横幅となっている。 In the reinforced rear region 62, the width gradually narrows toward the rear side in the front-rear direction, and the width of the base end is the same as the width of the tip of the neck portion 3.

また、補強部６は、横幅方向を基準とすれば、横幅方向において中央部に位置する補強中部６３と、横幅方向における補強中部６３の両側に連続し、且つ補強中部６３よりも急勾配となるように形成された補強縁部６４と、を有する（図６参照）。 Further, the reinforcing portion 6 is continuous on both sides of the reinforcing central portion 63 located in the central portion in the lateral width direction and the reinforcing central portion 63 in the lateral width direction, and has a steeper slope than the reinforcing central portion 63, based on the lateral width direction. It has a reinforcing edge portion 64 formed as described above (see FIG. 6).

補強中部６３と、ネック部３の背面３０とは、互いの境目に段差なく連続することで、１つの曲面を形成している。 The reinforcing central portion 63 and the back surface 30 of the neck portion 3 are continuous with each other without a step at the boundary thereof to form one curved surface.

補強中部６３は、最大幅部６０に含まれる部分の横幅が最も広くなるように形成されており、補強中部６３のうちの最大幅部６０よりも前後方向前方側の横幅は、前端側に向かうにつれて徐々に狭くなっている。一方で、補強中部６３のうちの最大幅部６０よりも前後方向後方側の横幅は、基端側から前方に向かうにつれて徐々に広くなっている。 The reinforcing central portion 63 is formed so that the width of the portion included in the maximum width portion 60 is the widest, and the lateral width on the front side in the front-rear direction of the maximum width portion 60 of the reinforcing central portion 63 is directed toward the front end side. It is getting narrower gradually. On the other hand, the lateral width of the reinforcing central portion 63 on the rear side in the front-rear direction with respect to the maximum width portion 60 gradually increases from the proximal end side toward the front.

また、補強縁部６４は、最大幅部６０に含まれる部分（前後方向における中央部）が、前後方向における前端と後端よりも横幅方向外側に位置するように湾曲している。すなわち、横幅方向外側に凸となるように湾曲している。 Further, the reinforcing edge portion 64 is curved so that the portion included in the maximum width portion 60 (the central portion in the front-rear direction) is located outside the front end and the rear end in the front-rear direction in the width direction. That is, it is curved so as to be convex outward in the width direction.

補強部６は、ヘッド部４を厚み方向で真っ直ぐ見たときに、幅広部が踵部５２と重なる位置に形成されている。また、本実施形態の補強部６は、最大幅部６０が刷掃部５の後端（踵部５２の最後部に位置する毛束５０の後端）よりも前後方向前方側、より具体的には、刷掃部５の後端と脇部５４の後端の間に位置するように形成されている。なお、本実施形態の最大幅部６０は、ヘッド部４を厚み方向からみたときに、踵部５２の最も後ろ側に位置する毛束５０と重なる位置を通るようにして形成されている。 The reinforcing portion 6 is formed at a position where the wide portion overlaps the heel portion 52 when the head portion 4 is viewed straight in the thickness direction. Further, in the reinforcing portion 6 of the present embodiment, the maximum width portion 60 is more specifically on the front side in the front-rear direction than the rear end of the sweeping portion 5 (the rear end of the hair bundle 50 located at the rearmost portion of the heel portion 52). Is formed so as to be located between the rear end of the sweep portion 5 and the rear end of the side portion 54. The maximum width portion 60 of the present embodiment is formed so as to pass through a position where the head portion 4 overlaps with the hair bundle 50 located on the rearmost side of the heel portion 52 when viewed from the thickness direction.

また、最大幅部６０の横幅方向における両端は、ヘッド基部４２の横幅方向における両端よりも内側に位置している。補強後側領域６２（補強縁部６４の後端部）の横幅方向における両端も、ヘッド基部４２の横幅方向における両端よりも内側に位置しており、前後方向前方側に向かうにつれてヘッド基部４２の両端との間隔が広がるように形成されている。なお、横幅方向においては、刷掃部５の外端（脇部５４の外端）の配置位置が、最大幅部６０の両端よりも外側であり且つヘッド部４の外周端よりも内側となるように設定されている。 Further, both ends of the maximum width portion 60 in the lateral width direction are located inside the both ends of the head base portion 42 in the lateral width direction. Both ends in the lateral width direction of the reinforcing rear side region 62 (rear end portion of the reinforcing edge portion 64) are also located inside the both ends in the lateral width direction of the head base portion 42, and the head base portion 42 is located toward the front side in the front-rear direction. It is formed so that the distance between both ends is widened. In the horizontal width direction, the arrangement position of the outer end of the sweeping portion 5 (outer end of the side portion 54) is outside both ends of the maximum width portion 60 and inside the outer peripheral end of the head portion 4. Is set to.

ここで、歯ブラシ１の各構成同士の寸法関係、位置関係について説明する。 Here, the dimensional relationship and the positional relationship between the configurations of the toothbrush 1 will be described.

ヘッド部４は、図７に示すように、植毛面４０がハンドル軸線Ａに対して８°傾くように形成されており、植毛面４０は、先端が後端よりも厚み方向内側に位置するように傾斜している。なお、ハンドル軸線Ａに対するヘッド部４の傾きは、８°〜１４°（本実施形態では８°）に設定されていればよい。 As shown in FIG. 7, the head portion 4 is formed so that the flocked surface 40 is tilted by 8 ° with respect to the handle axis A, and the tip of the flocked surface 40 is located inside the rear end in the thickness direction. It is inclined to. The inclination of the head portion 4 with respect to the handle axis A may be set to 8 ° to 14 ° (8 ° in this embodiment).

また、ヘッド部４の背面４１から刷掃部５の毛先までの寸法（厚み方向での寸法）は、例えば、１１.０ｍｍ〜１７.０ｍｍであればよい。なお、ヘッド部４の厚みは、３.０ｍｍ〜３．５ｍｍ、刷掃部５の厚み（植毛面４０から毛先までの毛丈）は、９.０ｍｍ〜１３.０ｍｍであればよい。なお、ヘッド部４の厚みと刷掃部５の厚みとは、１：３であることが好ましい。 The dimension (dimension in the thickness direction) from the back surface 41 of the head portion 4 to the tip of the bristles of the sweep portion 5 may be, for example, 11.0 mm to 17.0 mm. The thickness of the head portion 4 may be 3.0 mm to 3.5 mm, and the thickness of the sweep portion 5 (hair length from the flocked surface 40 to the tip of the hair) may be 9.0 mm to 13.0 mm. The thickness of the head portion 4 and the thickness of the sweeping portion 5 are preferably 1: 3.

さらに、刷掃部５の先端面には、ネック部３の基端部も位置している。 Further, a base end portion of the neck portion 3 is also located on the tip surface of the sweep portion 5.

図３に示すように、ヘッド部４の横幅の最大値は、ハンドル部２の横幅よりも小さくなっており、例えば、ヘッド部４の横幅は、１０.０ｍｍ〜１２.０ｍｍ、ハンドル部２の横幅は１１.０ｍｍ〜１５.０ｍｍに設定されていればよい。 As shown in FIG. 3, the maximum width of the head portion 4 is smaller than the width of the handle portion 2. For example, the width of the head portion 4 is 10.0 mm to 12.0 mm, and that of the handle portion 2. The width may be set to 11.0 mm to 15.0 mm.

また、ヘッド部４の横幅の最大値は、ネック部３の先端の横幅よりも広くなっている。なお、ネック部３は、例えば、基端の横幅が１１.０ｍｍ、先端の横幅が４．５ｍｍとなっていればよい。 Further, the maximum width of the head portion 4 is wider than the width of the tip of the neck portion 3. The neck portion 3 may have, for example, a base end having a width of 11.0 mm and a tip having a width of 4.5 mm.

本実施形態に係る歯ブラシ１の構成は、以上の通りである。本実施形態の歯ブラシ１によれば、ヘッド部４が、厚み２〜４ｍｍであり、且つ横幅が前記ハンドル部２の横幅よりも小さくなるように形成された、厚みと横幅が小さい小型のものであるため、歯ブラシ１を口に挿し込んだ際にヘッド部４が歯と頬の間に入り易くなっている。 The configuration of the toothbrush 1 according to the present embodiment is as described above. According to the toothbrush 1 of the present embodiment, the head portion 4 is a small one having a thickness and a width of 2 to 4 mm and having a width smaller than the width of the handle portion 2. Therefore, when the toothbrush 1 is inserted into the mouth, the head portion 4 easily enters between the teeth and the cheeks.

また、ヘッド部４は、湾曲するネック部３の前端に連続し、且つハンドル部２の軸線よりも厚み方向内側に位置するとともに、植毛面４０の基端よりも先端の方が前記厚み方向内側に位置するように８°傾いているため、ヘッド部４を歯の並びに沿わせて口の奥まで進入させ易くなっている。 Further, the head portion 4 is continuous with the front end of the curved neck portion 3 and is located inside in the thickness direction with respect to the axis of the handle portion 2, and the tip is inside with respect to the base end of the flocked surface 40 in the thickness direction. Since it is tilted by 8 ° so as to be located at, it is easy to allow the head portion 4 to enter the back of the mouth along the alignment of the teeth.

このように、上記構成の歯ブラシ１は、ヘッド部４を口の奥深くまで進入させ易くすることによって、刷掃部５の毛先を奥歯の後ろ側に回り込ませ易くなっている。なお、ネック部３が歯の並びに合わせて厚み方向外側に湾曲していることから、使用者がハンドル部２を回して歯を磨くとき（いわゆる、ローリング法により歯を磨くとき）に歯に対するネック部３の干渉を抑えつつ、ヘッド部４を大きく旋回させることにより、歯を十分な力で磨くことができるようになる。 As described above, the toothbrush 1 having the above configuration makes it easy for the head portion 4 to penetrate deep into the mouth so that the bristles of the sweeping portion 5 can easily wrap around behind the back teeth. Since the neck portion 3 is curved outward in the thickness direction in accordance with the alignment of the teeth, the neck for the teeth when the user brushes the teeth by turning the handle portion 2 (when brushing the teeth by the so-called rolling method). By turning the head portion 4 greatly while suppressing the interference of the portions 3, the teeth can be brushed with sufficient force.

また、刷掃部５の毛の毛丈が９．０ｍｍ〜１３．０ｍｍに設定されていることから、歯や歯茎に刷掃部の毛が当たった際、毛腰が硬すぎず、且つ柔らかすぎない適度なブラッシング圧が得られるようになっている。 Further, since the hair length of the brushing portion 5 is set to 9.0 mm to 13.0 mm, when the hair of the brushing portion hits the teeth or gums, the hair is not too hard and not too soft. Appropriate brushing pressure can be obtained.

さらに、ヘッド部４の背面４１の基端部にはネック部３の前端から延出する補強部６が幅広く重なっているため、ヘッド部４の基端部は、厚みが増すことによって剛性が高められている。そのため、毛束５０を歯に押し付けた際にネック部３に対するヘッド部４の撓みを防止することができ、これにより、使用者によって歯ブラシ１に込められた力の減少を抑えたうえで、この力を刷掃部５に伝えることができる。従って、上記構成の歯ブラシ１によれば、刷掃部５の毛を奥歯の裏側まで届かせたうえで、奥歯全体を刷掃部５によって十分な力で磨くことができる。 Further, since the reinforcing portion 6 extending from the front end of the neck portion 3 is widely overlapped with the base end portion of the back surface 41 of the head portion 4, the base end portion of the head portion 4 is increased in rigidity by increasing the thickness. Has been done. Therefore, it is possible to prevent the head portion 4 from bending with respect to the neck portion 3 when the hair bundle 50 is pressed against the teeth, thereby suppressing a decrease in the force applied to the toothbrush 1 by the user. The force can be transmitted to the sweeping unit 5. Therefore, according to the toothbrush 1 having the above configuration, the bristles of the sweeping portion 5 can reach the back side of the back teeth, and then the entire back teeth can be brushed by the wiping portion 5 with sufficient force.

以上のように、本実施形態の歯ブラシ１は、奥歯の裏側であっても刷掃部５の毛を当てて汚れを落とし易くすることによって、奥歯の磨き残しを減らすことができ、これにより、奥歯をしっかりと磨くことができるという優れた効果を奏し得る。 As described above, the toothbrush 1 of the present embodiment can reduce the amount of unpolished back teeth by applying the bristles of the sweeping portion 5 to make it easier to remove dirt even on the back side of the back teeth. It can have an excellent effect of being able to polish the hair firmly.

しかも、ネック部３は、ネック部３の前端がネック部３の基端よりも厚み方向において内側に位置し且つ頂部が厚み方向において補強部６よりも外側に位置するようにして湾曲しているため、ネック部３自体も厚み方向外側への撓みが抑えられる。 Moreover, the neck portion 3 is curved so that the front end of the neck portion 3 is located inside the base end of the neck portion 3 in the thickness direction and the top portion is located outside the reinforcing portion 6 in the thickness direction. Therefore, the neck portion 3 itself is also suppressed from bending outward in the thickness direction.

また、補強中部６３とネック部３の背面３０とは、互いの境目に段差がない状態で連続することで１つの曲面を形成しているため、ヘッド部４は、いっそう厚み方向外側に撓みにくくなっている。 Further, since the reinforcing central portion 63 and the back surface 30 of the neck portion 3 are continuous with each other without a step at the boundary, the head portion 4 is more difficult to bend outward in the thickness direction. It has become.

さらに、踵部５２を使って歯を磨くとき（いわゆる、踵磨きを行うとき）、ヘッド部４の基端部には歯から厚み方向外側に押し返される力が集中するが、本実施形態の補強部６は、ヘッド部４を厚み方向で真っ直ぐ見たときに、幅広部が踵部５２と重なるように形成されているため、この場合においても、ヘッド部４の基端部がネック部３に対して厚み方向外側に撓まないようにすることができる。 Further, when brushing the teeth using the heel portion 52 (so-called heel brushing), the force pushed back from the teeth outward in the thickness direction is concentrated on the base end portion of the head portion 4, but in the present embodiment Since the reinforcing portion 6 is formed so that the wide portion overlaps the heel portion 52 when the head portion 4 is viewed straight in the thickness direction, the base end portion of the head portion 4 is also the neck portion 3 in this case as well. It can be prevented from bending outward in the thickness direction.

なお、本実施形態の補強部６では、最大幅部６０、補強前側領域６１、補強後側領域６２のうちのヘッド部４の背面４１に重なっている部分がそれぞれヘッド部４の外端よりも内側に位置しており、さらに、補強前側領域６１と補強後側領域６２とは、最大幅部６０から離れるにつれて横幅が狭くなるように丸みを帯びた形状になっている。 In the reinforcing portion 6 of the present embodiment, the portion of the maximum width portion 60, the reinforcing front side region 61, and the reinforcing rear side region 62 that overlaps the back surface 41 of the head portion 4 is larger than the outer end of the head portion 4, respectively. It is located inside, and the reinforcing front side region 61 and the reinforcing rear side region 62 have a rounded shape so that the width becomes narrower as the distance from the maximum width portion 60 increases.

そのため、口に挿し込んだ歯ブラシ１を長手方向に沿って動かすとき（例えば、口の奥に挿し込んだり、口の奥から引き抜いたり、往復同させたりするとき）に補強部６が頬や歯に干渉してしまうことを抑えることができ、歯ブラシ１をスムーズに動かすことができるようになる。 Therefore, when the toothbrush 1 inserted into the mouth is moved along the longitudinal direction (for example, when it is inserted into the back of the mouth, pulled out from the back of the mouth, or reciprocated), the reinforcing portion 6 is used for the cheeks and teeth. It is possible to prevent the toothbrush 1 from interfering with the toothbrush 1 and to move the toothbrush 1 smoothly.

また、本実施形態の歯ブラシ１では、ネック部３の長手方向における寸法が６０．０ｍｍ〜７０．０ｍｍに設定されていてるため、奥歯の裏側、口腔内の奥側の歯列に刷掃部の毛を当てることが容易となる。 Further, in the toothbrush 1 of the present embodiment, since the dimension of the neck portion 3 in the longitudinal direction is set to 60.0 mm to 70.0 mm, the bristles of the brush portion are on the back side of the back teeth and the dentition on the back side of the oral cavity. It becomes easy to guess.

さらに、ヘッド部４の背面４１から刷掃部５の刷掃面までの寸法が１１．０ｍｍ〜１７．０ｍｍに設定されていることから、奥歯の裏側や、歯列と口唇部や頬の裏側等、口腔内の狭い箇所において刷掃部の毛先を歯と歯茎に当て易くなる。 Further, since the dimension from the back surface 41 of the head portion 4 to the sweeping surface of the sweeping portion 5 is set to 11.0 mm to 17.0 mm, the back side of the back teeth, the dentition and the lip part, the back side of the cheek, etc. , It becomes easier to apply the tip of the bristles of the brush to the teeth and gums in a narrow place in the oral cavity.

なお、本発明に係る歯ブラシは、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加え得ることは勿論である。 The toothbrush according to the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

上記実施形態において、刷掃部５は、前記毛束５０の列を５つ備えるように構成されていたが、毛束５０の列の数は５列でなくてもよい。 In the above embodiment, the sweeping unit 5 is configured to include five rows of the hair bundles 50, but the number of rows of the hair bundles 50 does not have to be five.

１…歯ブラシ、２…ハンドル部、３…ネック部、４…ヘッド部、５…刷掃部、６…補強部、３０…背面、４０…植毛面、４１…背面、４２…ヘッド基部、４３…ヘッド中部、４４…ヘッド先部、５０…毛束、５０Ａ、５０Ｂ…毛束、５１…つま先部、５２…踵部、５３…中部、５４…脇部、６０…最大幅部、６１…補強前側領域、６２…補強後側領域、６３…補強中部、６４…補強縁部、４２０…ヘッド基部の外周側面、４３０…ヘッド中部の外周側面、４４０…ヘッド先部の外周側面、Ａ…ハンドル軸線 1 ... toothbrush, 2 ... handle, 3 ... neck, 4 ... head, 5 ... sweep, 6 ... reinforcement, 30 ... back, 40 ... flocked surface, 41 ... back, 42 ... head base, 43 ... head Middle part, 44 ... Head tip part, 50 ... Hair bundle, 50A, 50B ... Hair bundle, 51 ... Toe part, 52 ... Heel part, 53 ... Middle part, 54 ... Side part, 60 ... Maximum width part, 61 ... Reinforcement front side area , 62 ... Reinforcement rear side region, 63 ... Reinforcement middle part, 64 ... Reinforcement edge part, 420 ... Outer outer side surface of head base 430 ... Outer outer side surface of head middle part 440 ... Outer outer side surface of head tip part, A ... Handle axis

Claims (5)

棒状のハンドル部と、
ハンドル部の長手方向における前端から延出するネック部と、
該ネック部の長手方向における前端につながる板状のヘッド部と、
前後方向で並ぶようにして該ヘッド部における厚み方向内側の植毛面に立設された複数の毛束によって構成される刷掃部と、
前記ネック部の前記前端から、前記ヘッド部における厚み方向外側の背面の基端側に重なるようにして延出する補強部と、を備え、
前記ヘッド部は、厚みが２〜４ｍｍに設定され、且つ横幅が前記ハンドル部の横幅よりも小さくなるように設定されるとともに、前記植毛面の先端が前記植毛面の基端よりも前記厚み方向内側に位置するように前記ハンドル部の軸線に対して８°〜１４°傾くように形成され、
前記ネック部は、厚みと横幅が前記ハンドル部よりも小さく設定され、且つ前記前端が前記軸線よりも厚み方向内側に位置するようにして湾曲し、
前記補強部は、横幅方向において前記ネック部の前記前端よりも外側に広がる幅広部であって、前記ヘッド部の前記背面の前記刷掃部の後端よりも前後方向前方側の領域に重なるように形成された幅広部を有し、
前記幅広部は、前記ヘッド部の背面における、前記前後方向に複数並ぶ前記毛束のうち少なくとも前記前後方向の後端に位置する前記毛束と重なる領域を含む領域に重なるように形成される、
歯ブラシ。 With a rod-shaped handle
A neck part extending from the front end in the longitudinal direction of the handle part,
A plate-shaped head portion connected to the front end in the longitudinal direction of the neck portion,
A sweeping portion composed of a plurality of hair bundles erected on the flocked surface on the inner side in the thickness direction of the head portion so as to be lined up in the front-rear direction.
A reinforcing portion extending from the front end of the neck portion so as to overlap the base end side of the back surface on the outer side in the thickness direction of the head portion is provided.
The head portion has a thickness set to 2-4 mm, and with the lateral width is set to be smaller than the width of the handle portion, the thickness direction than the proximal end of the tip of the bristles face the flocked surface It is formed so as to be located inside and tilted by 8 ° to 14 ° with respect to the axis of the handle portion.
The neck portion, the thickness and the width is set smaller than the handle portion, and the front end is curved so as to be positioned in the thickness direction inside than the axis,
The reinforcing portion, in the width direction than the front end of said neck portion a wide portion extending toward the outside, so as to overlap in the region of the longitudinal front side than the rear end of the printing Kamon of the back surface of the head portion have a wide portion which is formed on,
The wide portion is formed so as to overlap a region on the back surface of the head portion that includes a region overlapping the hair bundle located at least at the rear end in the front-rear direction among the hair bundles arranged in the front-rear direction.
toothbrush. 前記刷掃部は、前記後端部に位置する複数の毛束で構成され、且つ該複数の毛束に前記前後方向の後端に位置する前記毛束を含む踵部を備え、
前記補強部は、前記ヘッド部の前記背面における、前記踵部に含まれる複数の前記毛束と重なる領域を含む領域に対して前記ヘッド部の横幅方向で連続して重なるように形成される、
請求項１に記載の歯ブラシ。 The sweeping portion is composed of a plurality of hair bundles located at the rear end portion, and the plurality of hair bundles include a heel portion including the hair bundle located at the rear end in the front-rear direction.
The reinforcing portion is formed so as to continuously overlap in the lateral width direction of the head portion with respect to a region on the back surface of the head portion including a region including a plurality of hair bundles included in the heel portion.
The toothbrush according to claim 1. 前記幅広部は、横幅方向に連続して形成される最大幅部を有し、
前記最大幅部は、前記後端に位置する前記毛束の後端よりも前方側に位置している、
請求項１又は請求項２に記載の歯ブラシ。 The wide portion has a maximum width portion continuously formed in the lateral width direction, and has a maximum width portion.
The maximum width portion is located on the front side of the rear end of the hair bundle located at the rear end.
The toothbrush according to claim 1 or 2. 前記補強部は、前記最大幅部よりも前方側に位置する補強前側領域を有し、
前記補強前側領域は、前方側であるほど幅が狭くなるように形成される、
請求項３に記載の歯ブラシ。 The reinforcing portion has a reinforcing front side region located on the front side of the maximum width portion.
The front reinforcement region is formed so that the width becomes narrower toward the front side.
The toothbrush according to claim 3. 前記補強部は、前記最大幅部よりも後方側に位置する補強後側領域を有し、
前記補強後側領域は、後方側であるほど幅が狭くなるように形成される、
請求項３又は請求項４に記載の歯ブラシ。 The reinforcing portion has a reinforcing rear side region located on the rear side of the maximum width portion.
The reinforcing rear region is formed so that the width becomes narrower toward the rear side.
The toothbrush according to claim 3 or 4.
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