JP2005041040A

JP2005041040A - Barrel

Info

Publication number: JP2005041040A
Application number: JP2003201470A
Authority: JP
Inventors: Naoto Yoshihara; 直人吉原
Original assignee: Pentel Co Ltd
Current assignee: Pentel Co Ltd
Priority date: 2003-07-25
Filing date: 2003-07-25
Publication date: 2005-02-17
Anticipated expiration: 2023-07-25
Also published as: JP4433711B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrel which brings about a good sense of grip in a grip part wherein a plurality of protrusions are provided on its outer surface in such a shape as to protrude in an outer peripheral direction. <P>SOLUTION: In this barrel wherein at least an elastic resin is arranged in and/or provided integrally with the grip part of the barrel, the plurality of protrusions protruding in the outer peripheral direction are provided on the outer surface of the grip part; and the widths of the protrusions are made different from one another and/or those of groove parts are made different from one another. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、軸体の少なくとも把持部する部分に弾性樹脂を設けた軸体に関するものである。その軸体の１例としては、シャープペンシルやボールペン、修正ペンなどの筆記具、カッターや彫刻刀、ドライバーなどの工具類、ＰＤＡ（パーソナルデジタルアシスタンス）や電子手帳に使用される入力ペン、自転車のハンドルなどが挙げられる。
【０００２】
【従来の技術】
把持する部分には、滑り止めや把持しやすさといった効果を持たせるために様々な発明がなされている。滑り止めとしてはシリコーンやエラストマーといった弾性樹脂を把持部に配置した構成（グリップ）が採られており、弾性樹脂の形状や硬さを変化させることによって持ちやすい把持部を形成している。特に形状においては、グリップ本体の外周面に径方向に突出する複数の板状突起を前方側に向かって漸次高くなるように複数形成したもの（特許文献１）や、グリップ本体の外表面に、把持力により屈曲可能な複数の外径方向に突出する突状片部からなる群を、グリップ本体の周方向に離間して複数設けたもの（特許文献２）があげられる。このように外周部に径方向に突起を形成することにより、比較的硬度の高い材質でグリップを構成しても、柔らかい感触が得られ、また、把持した指がグリップの表面に局部的に深く沈み込んで指先を滑りにくくしている。
【０００３】
【特許文献１】
特許３１２１３１３号公報（請求項１）
【特許文献２】
特開２０００−０７１６７４号公報（請求項１）
【発明を解消しようとする課題】
上記特許文献１に記載された板状突起は周方向全体に亘って形成されており、板状突起はグリップ本体よりも外径方向に飛び出している。そのため、把持した時には板状突起が倒れて良好な感触を与えることができる一方で、板状突起を規制する力が弱いため、把持力を解除しても、復元せずに板状突起が倒れたままになるという問題がある。また、長期間の使用により板状突起の復元力は一層低下していくため、耐久性が悪いという問題もある。一方、特許文献２に記載された、外径方向に突出する突状片部からなる群をグリップ本体の周方向に離間して複数設けたものは、突状片部の復元力や耐久性という点では問題を解消しているが、周方向に形成されている突状片部が存在する部分と存在しない部分での滑りにくさに大きな違いが発生し、筆記時に違和感を生じてしまうという問題があった。
【０００４】
【課題を解決するための手段】
本発明は、上記問題点に鑑みてなされたものであって、軸体の把持部に少なくとも弾性樹脂を配置及び／または一体に設けた軸体において、前記把持部の外表面に外周方向に突出する環状突部を複数設け、この環状突部の幅及び／または環状溝部の幅を異ならしめたことを第１の要旨とし、軸体の把持部に少なくとも弾性樹脂を配置及び／または一体に設けた軸体において、前記把持部の外表面に長手方向に突出する線状突部を複数設け、この線状突部の幅及び／または線状溝部の幅を異ならしめたことを第２の要旨とするものである。
【０００５】
以下、本発明を詳細に説明する。把持部を有する軸体１（本実施例においては、筆記具）において、把持部２は軸体１の外周部で把持者の指先が接する部分に少なくとも設けられる。把持部２以外の軸体１の材質は、金属や樹脂、木材、石材などの形成できるものであればよく、把持部２を形成する材料が軸体１を形成できる強度を有していれば、その材料で把持部を軸体自体に形成することも可能であり、特に限定されない。また、これらの材質は１種または２種以上の混合物であってもよい。
【０００６】
把持部２の形状はその把持部２の外表面に、外周方向に突出した環状突部３を複数設け、一部の環状突部において突部の幅が異なる箇所を少なくとも一箇所設けてあればよい。即ち、幅の狭い突部３ａと幅の広い突部３ｂによって環状突部３が形成されている。また、隣り合う突部３ａ（或いは、突部３ｂ）の間隔、即ち、前記環状突部３を形成することによって形成される環状溝４の幅（４ａ、４ｂ）を変えて環状突部３を形成してもよい。さらに、幅の狭い突部３ａと幅の広い突部３ｂを設けるとともに、隣り合う突部３の間隔、即ち、幅の広い溝部４ａと幅の狭い溝に４ｂを変えてもよい。また、一つの環状突部５で、その環状突部５に幅の広い突部５ａと狭い突部５ｂが形成されていてもよい。この時、通常筆記時には、３本の指が把持部に接することから幅の異なる箇所を周方向に等間隔で３カ所設けると、把持しやすい箇所に指先が当たりやすくなる。
前記突部３、５の高さや幅及び溝部４、６の幅は特に限定されるものではないが、筋状の０．１ｍｍ程度の僅かな高さ、幅から、把持力により屈曲可能な０．１ｍｍ以上の高さ、幅まで可能であり、触感や屈曲変形機能の有無に応じて適宜選定すればよい。また、環状突部や環状溝部は必ずしも平行である必要はない。波状に周回した環状突部や環状溝部ではなく螺旋状に連接した突部や溝部であってもよい。また、環状突部に部分的に高低差を設けてもよい。具体的には、突部の外接円形は同一であっても内径方向に向かって突部の高さを部分的に変えてもよく、また、突部の内接円形は同一であっても外径方向に向かって突部の高さを部分的に変えてもよい。
さらに環状突部は平行な矩形状をなしているが、成型時の離型性を考慮して台形状にしてもよい。
以上の例において、軸筒１と把持部２を２色成形やインサート成形方法と言った手段で１体的に成形し、此によって安価な製品を提供することができるようになるが、各々を別部材で構成することによって、使用者などは種々の形状に把持部を選択することができるようになり、又、１種の把持部であっても挿着方向を変えることによって２種の触感が得られるようにもなる。
【０００７】
他の例を挙げ説明する。把持部２の形状はその把持部２の外表面の長手（縦）方向にに突出した線状突部７を複数設け、一部の線状突部において突部の幅が異なる箇所を少なくとも一箇所設けてあればよい。即ち、幅の狭い突部７ａと幅の広い突部７ｂによって線状突部７が形成されている。この時、通常筆記時には、３本の指が把持部に接することから幅の異なる箇所を周方向に等間隔で３カ所設けると、把持しやすい箇所に指先が当たりやすくなる。また、隣り合う突部７ａ（或いは、突部７ｂ）の間隔、即ち、前記線状突部７を形成することによって形成される線状溝８の幅（８ａ、８ｂ）を変えて線状突部７を形成してもよい。さらに、幅の狭い突部７ａと幅の広い突部７ｂを設けるとともに、隣り合う突部７の間隔、即ち、幅の広い溝部８ａと幅の狭い溝に８ｂを変えてもよい。また、一つの線状突部９で、その線状突部９に幅の広い突部９ａと狭い突部９ｂが形成されていてもよい。
前記突部７、９の高さや幅及び溝部８、１０の幅は特に限定されるものではないが、筋状の０．１ｍｍ程度の僅かな高さ、幅から、把持力により屈曲可能な０．１ｍｍ以上の高さ、幅まで可能であり、触感や屈曲変形機能の有無に応じて適宜選定すればよい。また、線状突部や線状溝部は必ずしも平行である必要はない。波状の線状突部や線状溝部や螺旋状に連接した突部や溝部であってもよい。また、線状突部に部分的に高低差を設けてもよい。具体的には、突部の外側面は同一面であっても内径方向に向かって突部の高さを部分的に変えてもよく、また、突部の内側面は同一であっても外側方向に向かって突部の高さを部分的に変えてもよい。
さらに線状突部は平行な矩形状をなしているが、成型時の離型性を考慮して台形状にしてもよい。
以上の例において、軸筒１と把持部２を２色成形やインサート成形方法と言った手段で１体的に成形し、此によって安価な製品を提供することができるようになるが、各々を別部材で構成することによって、使用者などは種々の形状に把持部を選択することができるようになり、又、１種の把持部であっても挿着方向を変えることによって２種の触感が得られるようにもなる。
【０００８】
把持部２には、弾性樹脂が使用される。その具体例としては、アクリル樹脂、シリコーン樹脂、フッ素樹脂、塩化ビニル、ウレタン樹脂、ポリウレタン樹脂、ポリエチレン樹脂、ジメチル系シリコーン、メチルビニル系シリコーン、メチルフェニルビニル系シリコーン、メチルフルオロアルキル系シリコーン（フロロシリコーン）、フロロ−ジメチル共重合シリコーン、ウレタンゴム、エチレンアクリルゴム、エピクロルヒドリンゴム、アクリルゴム、エチレンプロピレンゴム、クロロプレンゴム、天然ゴム、イソプレンゴム、塩素化ポリエチレン、ニトリルゴム、スチレン系エラストマー、オレフィン系エラストマー、エステル系エラストマー、ウレタン系エラストマーなどが挙げられるが、形状が維持できるものであれば特に限定されない。これら樹脂は１種または２種以上の混合物であってもよい。
【０００９】
これら弾性樹脂には触り心地や指先へのフィット感の向上、着色や文様といった意匠性の向上、抗菌や汗の吸放出、光触媒反応による自己洗浄といった機能性の付与のために粉体、微粒子、発泡剤などが含まれてもよい。
その粉体の具体例としては、スチレン、ナイロン、ポリオレフィン、シリコーン、エポキシ、ポリメタクリル酸メチルなどの樹脂粉体や、シリカ、アルミナ、ジルコニア、ガラス片、金属片などの無機粉体、シルクパウダー、木粉、コルク粉などの天然素材を粉体化したものなどが挙げられる。また、それらの粉体に、アクリル系、ウレタン系、エポキシ系などの粉体塗膜を被覆した複合粉体、さらには、自動乳鉢、ボールミル、ジェットミル、アトマイザー、ハイブリダイザーなどを用いて樹脂粉体にこの樹脂粉体より小さい無機粉体を吸着させたり、打ち込んだりしたものなども挙げられ、特に限定されない。また、粉体の形状は、無定型、球状、板状、針状などが用いられ、特に限定するものではない。これら粉体は１種または２種以上添加してもよい。
【００１０】
また、前記微粒子の具体例としては、カーボンブラック、グラファイトや、酸化チタン、酸化錫、酸化インジウムなどの酸化物、窒化チタン、窒化クロム、窒化ジルコニウム、窒化タンタルなどの窒化物、炭化チタン、炭化ジルコニウム、炭化タンタルなどの炭化物、ホウ化チタン、ホウ化ジルコニウム、ホウ化タンタルなどのホウ化物が挙げられ、特に限定されない。また、微粒子の形状は無定型、鱗片状、球状、繊維状などを用いることができる。これら微粒子は、１種または２種以上添加してもよい。
【００１１】
前記発泡剤は、化学発泡剤、物理発泡剤、熱膨張性マイクロカプセルなどが用いられる。
化学発泡剤の具体例は、アゾ化合物、ニトロソ化合物、ヒドラジン誘導体、セミカルバジド化合物、アジド化合物、トリアゾール化合物などの有機系熱分解型発泡剤、イソシアネート化合物などの有機系反応型発泡剤、重炭酸塩、炭酸塩、亜硫酸塩、水素化物などの無機系熱分解型発泡剤、重炭酸ナトリウム＋酸、過酸化水素＋イースト菌、亜鉛粉末＋酸などの無機系反応型発泡剤などが挙げられる。
物理発泡剤の具体例は、ブタン、ペンタン、ヘキサン、ジクロルエタン、ジクロルメタン、フロン、空気、炭酸ガス、窒素ガスなどが挙げられる。
熱膨張性マイクロカプセルの具体例は、イソブタン、ペンタン、石油エーテル、ヘキサンなどの低沸点炭化水素を芯物質とし、塩化ビニリデン、アクリロニトリル、アクリル酸エステル、メタクリル酸エステルなどの共重合体からなる熱可塑性樹脂を壁物質としたマイクロカプセルなどが挙げられ、特に限定されない。これら発泡剤は、１種または２種以上添加してもよい。
【００１２】
また、マイナスイオンを発生する物質が含まれてもよい。マイナスイオンを発生する物質としては、天然鉱物および微量の放射線を発する放射性物質が挙げられる。天然鉱物としてトルマリン（電気石）や珪藻土、古代海洋ミネラル層の成分および、それらの焼結体が挙げられる。微量の放射線を発する放射性物質としてジルコン、モズナ石、バストネス石および、それらの焼結体が挙げられる。
天然鉱物や放射性物質は粒子径が小さく、表面積が増えるほど、マイナスイオンの発生量が増加するとされている。そこで、本発明の弾性樹脂に含有させる天然鉱物や放射性物質の粒子径は、弾性樹脂の成形性や耐久性を考慮すると、０．０１〜１００μｍが好ましく、より好ましくは０．１〜１０μｍである。
また、天然鉱物や放射性物質の含有量の増加に伴い、マイナスイオンの発生量も増加するとされている。そこで、本発明の弾性樹脂に含有させる天然鉱物や放射性物質の含有量は、弾性樹脂の成形性や耐久性を考慮すると、樹脂１００重量部に対し０．０１〜１００重量部が好ましく、より好ましくは１〜５０重量部である。
また、天然鉱物や放射性物質の形状は、無定型、球状、板状、針状などが用いられ、特に限定するものではない。
【００１３】
把持部を構成する弾性樹脂の硬度は１０度から９０度までの硬度範囲の中で適宜選択すればよく、特に限定されるものではない。ただし、人体に当接する弾性樹脂の硬度は２０度以下の弾性樹脂では表面のべたつきが激しくかえって把持しにくく、ゴミなどが付着しやすくゴミの除去も困難であるといった問題があり、硬度が８０度以上の弾性樹脂ではグリップの感触が硬くなってしまい適度なグリップ感が得られないことから、硬度は２０度以上、８０度以下の範囲であることが望ましい。
【００１４】
把持部３の製造方法としては、圧縮成形やトランスファー成形、射出成形、押出成形、真空注形といった方法で成形した弾性樹脂を軸体に装着する方法や、インサート成形で形成するといった方法が挙げられるが、製造方法は特に限定されない。
【００１５】
【実施例】
以下、本発明を実施例により、より具体的に説明する。
＜実施例１＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられており、突部の幅が異なる箇所（狭い突部３ａ、広い突部３ｂ）が設けられている。（図２参照）狭い突部３ａの幅は０．２ｍｍ、広い突部３ｂの幅は０．４ｍｍ、突部間の幅は０．２ｍｍ、突部の高さは０．５ｍｍである。把持部２を軸体１（筆記具）に装着した。（図１）得られた筆記具は把持した際、狭い突部３ａは把持力で屈曲するが、広い部分の突部３ｂは屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、狭い突部３ａの部分の屈曲が感触に合わない場合には、広い突部３ｂが指先に当たるように把持部２の前後を入れ替えることによって良好な感触が得られる。広い突部３ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００１６】
＜実施例２＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度５０°）、射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられており、突部間の幅が異なる箇所（広い溝部４ａ、狭い溝部４ｂ）が設けられている。環状突部３の幅は０．２ｍｍ、広い溝部４ａの幅は０．３ｍｍ、狭い溝部４ｂの幅は０．２ｍｍ、突部３の高さは０．３ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、突部３の広い溝部４ａの部分は把持力で屈曲するが、狭い溝部４ｂの部分は屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、突部３の広い溝部４ａの部分の屈曲が感触に合わない場合には、突部３の狭い溝部４ｂが指先に当たるように把持部２の前後を入れ替えることによって良好な感触が得られる。突部３の狭い溝部４ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００１７】
＜実施例３＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度５０°）を用いて射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられており、突部の幅が異なる箇所（狭い突部３ａ、広い突部３ｂ）及び、突部間の幅が異なる箇所（広い溝部４ａ、狭い溝部４ｂ）設けられている。環状突部３の狭い突部３ａの幅は０．２ｍｍ、広い突部３ｂの幅は０．４ｍｍ、広い溝部４ａの幅は０．４ｍｍ、狭い溝部４ｂの幅は０．２ｍｍ、突部の高さは０．５ｍｍである。把持部３を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部３ａは把持力で屈曲し、広い突部３ｂがある為に屈曲しすぎることはなく筆記時の指の感触が良好であった。また、狭い突部３ｂが環状突部であることから滑り止め効果を十分に発揮し、余分な力が入らず、環状突部の耐久性も向上していた。
【００１８】
＜実施例４＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられており、突部の幅が異なる箇所（狭い突部５ａ、広い突部５ｂ）が設けられている。狭い突部５ａの幅は０．２ｍｍ、広い突部５ｂの幅は０．４ｍｍ、広い溝部６ａの幅は、０．４ｍｍ、狭い溝部６ｂの幅は０．２ｍｍ、突部の高さは０．５ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部５ａは把持力で屈曲するが、広い部分の突部５ｂは屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、狭い突部５ａの部分の屈曲が感触に合わない場合には、広い突部５ｂが指先に当たるように把持部２を約６０度回転させることによって良好な感触が得られる。広い突部５ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００１９】
＜実施例５＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて射出成形により把持部２を成形した。把持部２には長手方向にに突出した線状突部７が複数設けられており、突部の幅が異なる箇所（狭い突部７ａ、広い突部７ｂ）が設けられている。狭い突部７ａの幅は２ｍｍ、広い突部７ｂの幅は４ｍｍ、突部間の幅は２ｍｍ、突部の高さは２ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部７ａは把持力で屈曲するが、広い部分の突部７ｂは屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、狭い突部７ａの部分の屈曲が感触に合わない場合には、広い突部７ｂが指先に当たるように把持部２を約６０度回転させることによって良好な感触が得られる。広い突部７ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００２０】
＜実施例６＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度５０°）を用いて、射出成形により把持部２を成形した。把持部２には長手方向に突出した線状突部７が複数設けられており、突部間の幅が異なる箇所（広い溝部８ａ、狭い溝部８ｂ）が設けられている。環状突部３の幅は２ｍｍ、広い溝部４ａの幅は３ｍｍ、狭い溝部４ｂの幅は２ｍｍ、突部３の高さは２ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、突部７の広い溝部８ａの部分は把持力で屈曲するが、狭い溝部８ｂの部分は屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、突部７の広い溝部８ａの部分の屈曲が感触に合わない場合には、突部７の狭い溝部８ｂが指先に当たるように把持部２を約６０度回転させることによって良好な感触が得られる。突部７の狭い溝部８ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００２１】
＜実施例７＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度５０°）を用いて射出成形により把持部２を成形した。把持部２には長手方向に突出した線状突部７が複数設けられており、突部の幅が異なる箇所（狭い突部７ａ、広い突部７ｂ）及び、突部間の幅が異なる箇所（広い溝部８ａ、狭い溝部８ｂ）設けられている。線状突部７の狭い突部７ａの幅は２ｍｍ、広い突部７ｂの幅は４ｍｍ、広い溝部８ａの幅は３ｍｍ、狭い溝部８ｂの幅は２ｍｍ、突部の高さは５ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部７ａは把持力で屈曲し、広い突部７ｂがある為に屈曲しすぎることはなく筆記時の指の感触が良好であった。
【００２２】
＜実施例８＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて押出成形により把持部２を成形した。把持部２には長手方向に突出したＴ字状突部９が複数設けられており、突部の幅が異なる箇所（狭い突部９ａ、広い突部９ｂ）が設けられている。狭い突部９ａの幅は２ｍｍ、広い突部９ｂの幅は４ｍｍ、広い溝部１０ａの幅は４ｍｍ、狭い溝部１０ｂの幅は２ｍｍ、突部の高さは３ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部９ａは把持力で屈曲するが、広い部分の突部９ｂは屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。
【００２３】
＜実施例９＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度５０°）を用いて、押出成形により把持部２を成形した。把持部２には長手方向に突出した線状突部７が複数設けられており、突部の幅が異なる箇所（狭い突部７ａ、広い突部７ｂ）が設けられている。また、突部間の幅が異なる箇所（広い溝部８ａ、狭い溝部８ｂ）が設けられている。線状突部７の狭い突部７ａの幅は２ｍｍ、広い突部７ｂの幅は６ｍｍ、広い溝部４ａの幅は６ｍｍ、狭い溝部４ｂの幅は２ｍｍ、突部７の高さは０．５ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、狭い突部７ｂと広い溝部８ａの部分は把持力で屈曲するが、広い突部７ａと狭い溝部８ｂの部分は屈曲しすぎることはなく筆記時の指の感触が良好で筆記感も向上していた。また、突部７ａと広い溝部８ａの部分の屈曲が感触に合わない場合には、広い突部７ｂと狭い溝部８ｂが指先に当たるように把持部２の前後を入れ替えることによって良好な感触が得られる。広い突部７ｂの狭い溝部８ｂも把持力で僅かに屈曲する為、力が分散され、余分な力が入らず、筆記感も向上していた。
【００２４】
＜比較例１＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられている。環状突部３の幅と環状溝部４の幅は０．４ｍｍ、突部高さは０．５ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、突部高さが０．５ｍｍの部分は把持力で屈曲し、筆記時の指の感触が良好であったが、屈曲しすぎる為、余分な力が入り、環状突部３の耐久性も低かった。
【００２５】
＜比較例２＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて射出成形により把持部２を成形した。把持部２には外周方向に突出した環状突部３が複数設けられている。環状突部３の幅と環状溝部４の幅は０．４ｍｍ、突部高さは０．１ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、突部高さが０．１ｍｍの部分は滑り止め効果を発揮していたが、筆記時の指の感触が硬いと感じられた。また筆圧を大きくし、強く握ったときも指が痛くなる等の不具合があった。
【００２６】
＜比較例３＞ジメチル系シリコーンゴム（ＧＥ東芝シリコーン（株）製、ＴＳＥ２５７０−６Ｕ、ゴム硬度３０°）を用いて押出成形により把持部２を成形した。把持部２には長手方向に突出した線状突部７が複数設けられている。線状突部７の幅と線状溝部７の幅は２ｍｍ、突部高さは２ｍｍである。把持部２を軸体１（筆記具）に装着した。得られた筆記具は把持した際、線状突部７は滑り止め効果を発揮していたが、筆記時の指の感触が硬いと感じられた。また筆圧を大きくし、強く握ったときも指が痛くなる等の不具合があった。
【００２７】
【発明の効果】
以上、実施例に示したように、本発明は、軸体の把持部に少なくとも弾性樹脂を配置及び／または一体に設けた軸体において、前記把持部の外表面に外周方向に突出する環状突部を複数設け、この環状突部の幅及び／または環状溝部の幅を異ならしめたことを第１の要旨とし、軸体の把持部に少なくとも弾性樹脂を配置及び／または一体に設けた軸体において、前記把持部の外表面に長手方向に突出する線状突部を複数設け、この線状突部の幅及び／または線状溝部の幅を異ならしめたことを第２の要旨としているので、快適な把持感が得られるとともに、突部の曲がり過ぎない部分を設けることにより、好みに応じた把持感を選択できる。
【図面の簡単な説明】
【図１】本発明を示す外観図。
【図２】本発明、実施例１を示す把持部の外観図。
【図３】本発明、実施例２を示す把持部の外観図。
【図４】本発明、実施例３を示す把持部の外観図。
【図５】本発明、実施例４を示す把持部の外観図。
【図６】本発明、実施例５を示す把持部の外観図。
【図７】本発明、実施例６を示す把持部の外観図。
【図８】本発明、実施例７を示す把持部の外観図。
【図９】本発明、実施例８を示す把持部の外観図。
【図１０】本発明、実施例９を示す把持部の外観図。
【図１１】本発明、実施例９のＡ−Ａ断面図。
【図１２】本発明、実施例９のＢ−Ｂ断面図。
【符号の説明】
１軸体
２把持部
３環状突部
３ａ狭い環状突部
３ｂ広い環状突部
４環状溝部
４ａ広い環状溝部
４ｂ狭い環状溝部
５ａ狭い環状突部
５ｂ広い環状突部
６環状溝部
６ａ広い環状溝部
６ｂ狭い環状溝部
７線状突部
７ａ狭い線状突部
７ｂ広い線状突部
８線状溝部
８ａ広い線状溝部
８ｂ狭い線状溝部
９Ｔ字状突部
９ａ狭い線状突部
９ｂ広い線状突部
１０線状溝部
１０ａ広い線状溝部
１０ｂ狭い線状溝部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft body in which an elastic resin is provided on at least a portion of the shaft body that is to be gripped. Examples of shafts include writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters, engraving swords, and drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, and bicycle handles. Etc.
[0002]
[Prior art]
Various inventions have been made in order to give the gripping portion effects such as slip prevention and ease of gripping. As the anti-slip material, a configuration (grip) in which an elastic resin such as silicone or elastomer is disposed in the grip portion is employed, and a grip portion that is easy to hold is formed by changing the shape and hardness of the elastic resin. In particular, in the shape, a plurality of plate-like protrusions projecting radially on the outer peripheral surface of the grip body are formed so as to gradually increase toward the front side (Patent Document 1), or on the outer surface of the grip body, An example is one in which a plurality of groups of protruding pieces protruding in the outer diameter direction that can be bent by a gripping force are provided apart from each other in the circumferential direction of the grip body (Patent Document 2). By forming protrusions in the radial direction on the outer peripheral portion in this way, a soft feel can be obtained even if the grip is made of a relatively hard material, and the gripped finger is locally deep on the surface of the grip. It sinks, making it difficult for your fingertips to slip.
[0003]
[Patent Document 1]
Japanese Patent No. 3121313 (Claim 1)
[Patent Document 2]
JP 2000-071674 A (Claim 1)
[Problem to solve the invention]
The plate-like protrusion described in Patent Document 1 is formed over the entire circumferential direction, and the plate-like protrusion protrudes in the outer diameter direction from the grip body. For this reason, the plate-like projections can fall and give a good feel when gripped, but the force that regulates the plate-like projections is weak, so even if the gripping force is released, the plate-like projections fall without being restored. There is a problem of being left. In addition, since the restoring force of the plate-like projections is further reduced by long-term use, there is a problem that the durability is poor. On the other hand, what was described in Patent Document 2 and provided with a plurality of groups of protruding pieces protruding in the outer diameter direction in the circumferential direction of the grip body is referred to as restoring force and durability of the protruding pieces. Although the problem has been solved in terms of point, there is a big difference in the difficulty of slipping between the part where the protruding piece part formed in the circumferential direction exists and the part where it does not exist, and it causes a sense of incongruity when writing was there.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and in a shaft body in which at least an elastic resin is disposed and / or integrally provided in a grip portion of the shaft body, the outer surface of the grip portion protrudes in an outer circumferential direction. The first gist is that a plurality of annular protrusions are provided and the width of the annular protrusions and / or the width of the annular groove parts are different, and at least an elastic resin is disposed and / or integrally provided in the grip portion of the shaft body. In the second shaft, a plurality of linear protrusions projecting in the longitudinal direction are provided on the outer surface of the gripping part, and the width of the linear protrusions and / or the width of the linear groove parts are different. It is what.
[0005]
Hereinafter, the present invention will be described in detail. In the shaft body 1 (a writing instrument in the present embodiment) having a gripping portion, the gripping portion 2 is provided at least at a portion of the outer periphery of the shaft body 1 where the fingertip of the gripper contacts. The material of the shaft body 1 other than the grip portion 2 may be any material that can be formed of metal, resin, wood, stone, or the like, as long as the material forming the grip portion 2 has sufficient strength to form the shaft body 1. The grip portion can be formed on the shaft body itself with the material, and is not particularly limited. These materials may be one kind or a mixture of two or more kinds.
[0006]
The shape of the gripping portion 2 is such that a plurality of annular protrusions 3 projecting in the outer circumferential direction are provided on the outer surface of the gripping portion 2 and at least one location where the width of the projection is different is provided in some of the annular projections. Good. That is, the annular protrusion 3 is formed by the narrow protrusion 3a and the wide protrusion 3b. Further, the annular protrusion 3 is changed by changing the interval between adjacent protrusions 3a (or protrusions 3b), that is, the width (4a, 4b) of the annular groove 4 formed by forming the annular protrusion 3. It may be formed. Furthermore, while providing the narrow protrusion 3a and the wide protrusion 3b, you may change 4b into the space | interval of the adjacent protrusion 3, ie, the wide groove part 4a, and a narrow groove | channel. Further, with the single annular protrusion 5, a wide protrusion 5 a and a narrow protrusion 5 b may be formed on the annular protrusion 5. At this time, during normal writing, since three fingers are in contact with the gripping portion, providing three locations with different widths at equal intervals in the circumferential direction makes it easier for the fingertip to hit a location that is easy to grip.
The heights and widths of the protrusions 3 and 5 and the widths of the grooves 4 and 6 are not particularly limited, but can be bent by a gripping force from a slight height and width of about 0.1 mm in a streak shape. It can be up to 1 mm or more in height and width, and may be appropriately selected according to the presence or absence of a tactile sensation and a bending deformation function. Further, the annular protrusion and the annular groove need not be parallel. Instead of an annular protrusion or an annular groove that circulates in a wavy shape, a protrusion or groove that is spirally connected may be used. Moreover, you may provide a height difference partially in a cyclic | annular protrusion. Specifically, even if the circumscribed circle of the protrusion is the same, the height of the protrusion may be partially changed toward the inner diameter direction. You may change partially the height of a protrusion toward radial direction.
Furthermore, although the annular protrusion has a parallel rectangular shape, it may be trapezoidal in consideration of releasability during molding.
In the above example, the shaft tube 1 and the gripping part 2 are molded as a single body by means of a two-color molding or insert molding method, whereby an inexpensive product can be provided. By using a separate member, the user can select the gripping part in various shapes, and two types of tactile sensations can be achieved by changing the insertion direction even with one type of gripping part. Can also be obtained.
[0007]
Another example will be described. The shape of the gripping portion 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal (vertical) direction of the outer surface of the gripping portion 2, and at least one portion where the widths of the protrusions differ in some of the linear protrusions. It suffices if there are places. That is, the linear protrusion 7 is formed by the narrow protrusion 7a and the wide protrusion 7b. At this time, during normal writing, since three fingers are in contact with the gripping portion, providing three locations with different widths at equal intervals in the circumferential direction makes it easier for the fingertip to hit a location that is easy to grip. Further, the linear protrusion is changed by changing the interval between the adjacent protrusions 7a (or protrusions 7b), that is, the width (8a, 8b) of the linear groove 8 formed by forming the linear protrusions 7. The part 7 may be formed. Furthermore, while providing the narrow protrusion 7a and the wide protrusion 7b, you may change 8b into the space | interval of the adjacent protrusion 7, ie, the wide groove part 8a and the narrow groove | channel. Further, with one linear protrusion 9, a wide protrusion 9a and a narrow protrusion 9b may be formed on the linear protrusion 9.
The heights and widths of the protrusions 7 and 9 and the widths of the groove portions 8 and 10 are not particularly limited, but can be bent by a gripping force from a slight height and width of about 0.1 mm in a streak shape. It can be up to 1 mm or more in height and width, and may be appropriately selected according to the presence or absence of a tactile sensation and a bending deformation function. Further, the linear protrusions and the linear grooves do not necessarily have to be parallel. It may be a wavy linear protrusion, a linear groove, or a helically connected protrusion or groove. Moreover, you may provide a height difference partially in a linear protrusion. Specifically, the outer surface of the protrusion may be the same surface, or the height of the protrusion may be partially changed toward the inner diameter direction, and the inner surface of the protrusion may be the same or the outer surface. You may change partially the height of a protrusion toward a direction.
Furthermore, although the linear protrusion has a parallel rectangular shape, it may be trapezoidal in consideration of releasability during molding.
In the above example, the shaft tube 1 and the gripping part 2 are molded as a single body by means of a two-color molding or insert molding method, whereby an inexpensive product can be provided. By using a separate member, the user can select the gripping part in various shapes, and two types of tactile sensations can be achieved by changing the insertion direction even with one type of gripping part. Can also be obtained.
[0008]
An elastic resin is used for the grip portion 2. Specific examples include acrylic resin, silicone resin, fluororesin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone, methyl fluoroalkyl silicone (fluorosilicone). ), Fluoro-dimethyl copolymer silicone, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, An ester-based elastomer, a urethane-based elastomer, and the like can be given, but there is no particular limitation as long as the shape can be maintained. These resins may be one kind or a mixture of two or more kinds.
[0009]
These elastic resins provide powders, fine particles, and fine particles to improve functionality such as touch and fingertips, improved design such as coloring and patterns, antibacterial and sweat absorption and release, and self-cleaning by photocatalytic reactions. A foaming agent or the like may be included.
Specific examples of the powder include resin powder such as styrene, nylon, polyolefin, silicone, epoxy, polymethyl methacrylate, inorganic powder such as silica, alumina, zirconia, glass piece, metal piece, silk powder, Examples include powdered natural materials such as wood flour and cork flour. In addition, composite powders obtained by coating these powders with powder coatings such as acrylic, urethane, and epoxy resins, and resin powders using automatic mortars, ball mills, jet mills, atomizers, hybridizers, etc. Examples include those in which an inorganic powder smaller than the resin powder is adsorbed or driven into the body, and is not particularly limited. Further, the shape of the powder may be amorphous, spherical, plate-like, or needle-like, and is not particularly limited. These powders may be added alone or in combination.
[0010]
Specific examples of the fine particles include carbon black, graphite, oxides such as titanium oxide, tin oxide, and indium oxide, nitrides such as titanium nitride, chromium nitride, zirconium nitride, and tantalum nitride, titanium carbide, and zirconium carbide. , Carbides such as tantalum carbide, and borides such as titanium boride, zirconium boride, and tantalum boride. Further, the shape of the fine particles may be amorphous, scaly, spherical or fibrous. One kind or two or more kinds of these fine particles may be added.
[0011]
As the foaming agent, a chemical foaming agent, a physical foaming agent, a thermally expandable microcapsule, or the like is used.
Specific examples of the chemical foaming agent include organic pyrolytic foaming agents such as azo compounds, nitroso compounds, hydrazine derivatives, semicarbazide compounds, azide compounds, and triazole compounds, organic reactive foaming agents such as isocyanate compounds, bicarbonates, Examples include inorganic pyrolytic foaming agents such as carbonates, sulfites, and hydrides, and inorganic reactive foaming agents such as sodium bicarbonate + acid, hydrogen peroxide + yeast bacteria, zinc powder + acids, and the like.
Specific examples of the physical foaming agent include butane, pentane, hexane, dichloroethane, dichloromethane, chlorofluorocarbon, air, carbon dioxide gas, nitrogen gas and the like.
Specific examples of thermally expandable microcapsules are thermoplastics composed of copolymers of vinylidene chloride, acrylonitrile, acrylate esters, methacrylate esters, etc., with low-boiling hydrocarbons such as isobutane, pentane, petroleum ether, and hexane as the core material. A microcapsule using a resin as a wall material can be used and is not particularly limited. You may add these foaming agents 1 type, or 2 or more types.
[0012]
Moreover, the substance which generate | occur | produces a negative ion may be contained. Examples of substances that generate negative ions include natural minerals and radioactive substances that emit trace amounts of radiation. Examples of natural minerals include tourmaline (tourmaline), diatomaceous earth, components of ancient marine mineral layers, and sintered bodies thereof. Examples of radioactive substances that emit a trace amount of radiation include zircon, moznaite, bustness stone, and sintered bodies thereof.
Natural minerals and radioactive materials are said to have a smaller particle size and increase the amount of negative ions as the surface area increases. Therefore, the particle diameter of the natural mineral or radioactive substance contained in the elastic resin of the present invention is preferably 0.01 to 100 μm, more preferably 0.1 to 10 μm, considering the moldability and durability of the elastic resin. .
In addition, with the increase in the content of natural minerals and radioactive materials, the amount of negative ions generated is also expected to increase. Therefore, the content of the natural mineral or radioactive substance contained in the elastic resin of the present invention is preferably 0.01 to 100 parts by weight, more preferably 100 parts by weight of the resin, considering the moldability and durability of the elastic resin. Is 1 to 50 parts by weight.
In addition, the shape of the natural mineral or radioactive substance may be amorphous, spherical, plate-like, or needle-like, and is not particularly limited.
[0013]
The hardness of the elastic resin constituting the gripping part may be appropriately selected within a hardness range from 10 degrees to 90 degrees, and is not particularly limited. However, the hardness of the elastic resin that comes into contact with the human body is 20 degrees or less, and there is a problem that the surface is so sticky that it is difficult to grip, the dust is likely to adhere and the removal of the dust is difficult, and the hardness is 80 degrees. With the above elastic resin, the grip feel becomes hard and an appropriate grip feeling cannot be obtained. Therefore, the hardness is desirably in the range of 20 degrees or more and 80 degrees or less.
[0014]
As a manufacturing method of the grip part 3, a method of attaching an elastic resin formed by a method such as compression molding, transfer molding, injection molding, extrusion molding, or vacuum casting to a shaft body, or a method of forming by insert molding may be mentioned. However, the manufacturing method is not particularly limited.
[0015]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
<Example 1> The grip portion 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °). The grip portion 2 is provided with a plurality of annular protrusions 3 projecting in the outer peripheral direction, and provided with portions (narrow protrusion 3a, wide protrusion 3b) having different protrusion widths. (See FIG. 2) The width of the narrow protrusion 3a is 0.2 mm, the width of the wide protrusion 3b is 0.4 mm, the width between the protrusions is 0.2 mm, and the height of the protrusions is 0.5 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). (FIG. 1) When the obtained writing instrument is gripped, the narrow protrusion 3a bends with a gripping force, but the wide protrusion 3b does not bend excessively, and the finger feels good when writing and the writing feeling is also good. It was improving. If the bending of the narrow protrusion 3a does not match the feel, a good feeling can be obtained by switching the front and rear of the grip 2 so that the wide protrusion 3b hits the fingertip. Since the wide protrusion 3b is also slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0016]
<Example 2> The grip part 2 was molded by dimethyl silicone rubber (manufactured by GE Toshiba Silicone, TSE2570-6U, rubber hardness 50 °), and injection molding. The grip portion 2 is provided with a plurality of annular protrusions 3 protruding in the outer peripheral direction, and provided with portions (wide groove portions 4a and narrow groove portions 4b) having different widths between the protrusions. The width of the annular protrusion 3 is 0.2 mm, the width of the wide groove 4 a is 0.3 mm, the width of the narrow groove 4 b is 0.2 mm, and the height of the protrusion 3 is 0.3 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument is gripped, the wide groove 4a portion of the protrusion 3 is bent by the gripping force, but the narrow groove 4b portion is not excessively bent and the finger feels good during writing and the writing feeling is also good. It was improving. If the bending of the wide groove portion 4a of the protrusion 3 does not match the feel, a good feeling can be obtained by changing the front and back of the grip portion 2 so that the narrow groove portion 4b of the protrusion 3 hits the fingertip. Since the narrow groove 4b of the protrusion 3 is also slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0017]
<Example 3> The grip portion 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 50 °). The grip portion 2 is provided with a plurality of annular protrusions 3 projecting in the outer peripheral direction, where the protrusions have different widths (narrow protrusions 3a and wide protrusions 3b) and different widths between the protrusions ( A wide groove 4a and a narrow groove 4b) are provided. The width of the narrow protrusion 3a of the annular protrusion 3 is 0.2 mm, the width of the wide protrusion 3b is 0.4 mm, the width of the wide groove 4a is 0.4 mm, the width of the narrow groove 4b is 0.2 mm, The height is 0.5 mm. The grip portion 3 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the narrow protrusion 3a was bent by the gripping force, and since there was a wide protrusion 3b, it was not bent too much, and the finger feel during writing was good. Moreover, since the narrow protrusion 3b is an annular protrusion, the anti-slip effect is sufficiently exhibited, no extra force is applied, and the durability of the annular protrusion is improved.
[0018]
<Example 4> The grip part 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °). The grip portion 2 is provided with a plurality of annular protrusions 3 that protrude in the outer peripheral direction, and are provided with locations (narrow protrusion 5a, wide protrusion 5b) having different protrusion widths. The width of the narrow protrusion 5a is 0.2 mm, the width of the wide protrusion 5b is 0.4 mm, the width of the wide groove 6a is 0.4 mm, the width of the narrow groove 6b is 0.2 mm, and the height of the protrusion is 0. .5 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument is gripped, the narrow protrusion 5a bends with a gripping force, but the wide protrusion 5b does not bend too much, and the finger feeling during writing is good and the writing feeling is improved. . If the bending of the narrow protrusion 5a does not match the feel, the grip 2 can be rotated about 60 degrees so that the wide protrusion 5b hits the fingertip. Since the wide protrusion 5b is slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0019]
<Example 5> The grip portion 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °). The grip portion 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal direction, and is provided with portions having different protrusion widths (a narrow protrusion 7a and a wide protrusion 7b). The width of the narrow protrusion 7a is 2 mm, the width of the wide protrusion 7b is 4 mm, the width between the protrusions is 2 mm, and the height of the protrusions is 2 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the narrow protrusion 7a was bent by the gripping force, but the wide protrusion 7b was not bent excessively, and the finger feeling during writing was good and the writing feeling was improved. . If the bending of the narrow protrusion 7a does not match the feel, the grip 2 can be rotated about 60 degrees so that the wide protrusion 7b hits the fingertip. Since the wide protrusion 7b is also slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0020]
<Example 6> The holding part 2 was shape | molded by injection molding using the dimethyl-type silicone rubber (GE Toshiba Silicones Co., Ltd. make, TSE2570-6U, rubber hardness 50 degrees). The grip portion 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal direction, and provided with portions (wide groove portions 8a and narrow groove portions 8b) having different widths between the protrusions. The width of the annular protrusion 3 is 2 mm, the width of the wide groove 4a is 3 mm, the width of the narrow groove 4b is 2 mm, and the height of the protrusion 3 is 2 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument is gripped, the wide groove portion 8a of the protrusion 7 is bent by the gripping force, but the narrow groove portion 8b is not excessively bent, and the finger feeling during writing is good and the writing feeling is also good. It was improving. Further, when the bending of the wide groove portion 8a of the protrusion 7 does not match the feel, the grip portion 2 is rotated about 60 degrees so that the narrow groove portion 8b of the protrusion 7 contacts the fingertip. It is done. Since the narrow groove 8b of the protrusion 7 is also slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0021]
<Example 7> The grip portion 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 50 °). The grip part 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal direction, where the protrusions have different widths (narrow protrusions 7a and wide protrusions 7b) and where the widths between the protrusions are different. (Wide groove portion 8a, narrow groove portion 8b) are provided. The width of the narrow protrusion 7a of the linear protrusion 7 is 2 mm, the width of the wide protrusion 7b is 4 mm, the width of the wide groove 8a is 3 mm, the width of the narrow groove 8b is 2 mm, and the height of the protrusion is 5 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the narrow protrusion 7a was bent by the gripping force, and since there was a wide protrusion 7b, it was not excessively bent, and the finger feel during writing was good.
[0022]
<Example 8> The grip portion 2 was molded by extrusion molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °). A plurality of T-shaped protrusions 9 projecting in the longitudinal direction are provided on the grip portion 2, and portions (narrow protrusion 9 a and wide protrusion 9 b) having different protrusion widths are provided. The width of the narrow protrusion 9a is 2 mm, the width of the wide protrusion 9b is 4 mm, the width of the wide groove 10a is 4 mm, the width of the narrow groove 10b is 2 mm, and the height of the protrusion is 3 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the narrow protrusion 9a was bent by the gripping force, but the wide protrusion 9b was not bent excessively, and the finger feeling during writing was good and the writing feeling was improved. .
[0023]
<Example 9> The holding part 2 was shape | molded by extrusion molding using the dimethyl-type silicone rubber (GE Toshiba Silicones Co., Ltd. make, TSE2570-6U, rubber hardness 50 degrees). The grip portion 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal direction, and is provided with places having different protrusion widths (narrow protrusion 7a and wide protrusion 7b). Moreover, the location (wide groove part 8a, narrow groove part 8b) from which the width | variety between protrusions differs is provided. The width of the narrow protrusion 7a of the linear protrusion 7 is 2 mm, the width of the wide protrusion 7b is 6 mm, the width of the wide groove 4a is 6 mm, the width of the narrow groove 4b is 2 mm, and the height of the protrusion 7 is 0.5 mm. It is. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing tool is gripped, the narrow protrusion 7b and the wide groove 8a are bent by the gripping force, but the wide protrusion 7a and the narrow groove 8b are not excessively bent and the finger feels during writing. The writing feeling was also improved. If the bending of the protrusion 7a and the wide groove 8a does not fit the feel, a good feeling can be obtained by switching the front and back of the grip 2 so that the wide protrusion 7b and the narrow groove 8b come into contact with the fingertips. . Since the narrow groove 8b of the wide protrusion 7b is also slightly bent by the gripping force, the force is dispersed, no extra force is applied, and the writing feeling is improved.
[0024]
<Comparative example 1> The holding | gripping part 2 was shape | molded by injection molding using the dimethyl-type silicone rubber (The product made by GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 degrees). The grip portion 2 is provided with a plurality of annular protrusions 3 protruding in the outer peripheral direction. The width of the annular protrusion 3 and the width of the annular groove 4 are 0.4 mm, and the protrusion height is 0.5 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the portion with a protrusion height of 0.5 mm was bent with a gripping force, and the finger feel at the time of writing was good, but because it was bent too much, extra force entered, The durability of the annular protrusion 3 was also low.
[0025]
<Comparative example 2> The holding part 2 was shape | molded by injection molding using the dimethyl-type silicone rubber (The product made by GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 degrees). The grip portion 2 is provided with a plurality of annular protrusions 3 protruding in the outer peripheral direction. The width of the annular protrusion 3 and the width of the annular groove 4 are 0.4 mm, and the protrusion height is 0.1 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the portion having a protrusion height of 0.1 mm exhibited a non-slip effect, but it was felt that the finger feel at the time of writing was hard. In addition, when the pen pressure was increased and the hand was held strongly, there were problems such as the finger becoming painful.
[0026]
<Comparative example 3> The holding | gripping part 2 was shape | molded by extrusion molding using the dimethyl-type silicone rubber (The product made by GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 degrees). The grip portion 2 is provided with a plurality of linear protrusions 7 protruding in the longitudinal direction. The width of the linear protrusion 7 and the width of the linear groove 7 are 2 mm, and the protrusion height is 2 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the linear protrusion 7 exhibited a non-slip effect, but it was felt that the finger feel at the time of writing was hard. In addition, when the pen pressure was increased and the hand was held strongly, there were problems such as the finger becoming painful.
[0027]
【The invention's effect】
As described above, according to the present invention, in the shaft body in which at least the elastic resin is arranged and / or integrally provided in the grip portion of the shaft body, the annular projection protruding in the outer peripheral direction on the outer surface of the grip portion. A shaft body in which a plurality of portions are provided, and the width of the annular protrusion and / or the width of the annular groove portion is set as a first gist, and at least an elastic resin is disposed and / or integrally provided in the grip portion of the shaft body The second gist is that a plurality of linear protrusions projecting in the longitudinal direction are provided on the outer surface of the gripping part, and the widths of the linear protrusions and / or the widths of the linear groove parts are made different. A comfortable gripping feeling can be obtained, and a gripping feeling according to preference can be selected by providing a portion where the protrusion does not bend excessively.
[Brief description of the drawings]
FIG. 1 is an external view showing the present invention.
FIG. 2 is an external view of a gripping part showing the present invention, Example 1. FIG.
FIG. 3 is an external view of a gripping part showing the present invention, Example 2;
FIG. 4 is an external view of a gripping part showing the present invention, Example 3;
FIG. 5 is an external view of a gripping part showing the present invention, Example 4;
FIG. 6 is an external view of a gripping part showing the present invention, Example 5.
FIG. 7 is an external view of a gripping part showing the present invention, Example 6;
FIG. 8 is an external view of a gripping part showing the present invention, Example 7.
FIG. 9 is an external view of a gripping part showing the present invention, Example 8.
FIG. 10 is an external view of a gripping part showing the present invention, Example 9.
11 is a cross-sectional view of the present invention, Example 9 taken along the line AA. FIG.
FIG. 12 is a sectional view taken along the line BB of the present invention, Example 9.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft 2 Grasping part 3 Annular protrusion 3a Narrow annular protrusion 3b Wide annular protrusion 4 Annular groove part 4a Wide annular groove part 4b Narrow annular groove part 5a Narrow annular protrusion part 5b Wide annular protrusion part 6a Wide annular groove part 6b Narrow area Annular groove 7 Linear protrusion 7a Narrow linear protrusion 7b Wide linear protrusion 8 Linear groove 8a Wide linear groove 8b Narrow linear groove 9 T-shaped protrusion 9a Narrow linear protrusion 9b Wide linear protrusion Part 10 Linear groove part 10a Wide linear groove part 10b Narrow linear groove part

Claims

In a shaft body in which at least elastic resin is disposed and / or integrally provided on the grip portion of the shaft body, a plurality of annular protrusions projecting in the outer circumferential direction are provided on the outer surface of the grip portion, and the width and / or width of the annular protrusion A shaft body characterized by varying the width of the annular groove.

In a shaft body in which at least an elastic resin is disposed and / or integrally provided on the grip portion of the shaft body, a plurality of linear protrusions projecting in the longitudinal direction are provided on the outer surface of the grip portion, and the width of the linear protrusion and A shaft body characterized in that the width of the linear groove part is made different.

The shaft body according to claim 1, wherein the plurality of protrusions are provided in parallel.

The shaft body according to any one of claims 1 to 3, wherein a part or all of the protrusion is bendable by gripping.

The shaft body according to any one of claims 1 to 4, wherein the elastic resin contains a substance that generates negative ions.

The shaft body according to claim 5, wherein the substance that generates negative ions is tourmaline, or one, two, or three kinds of mixtures selected from diatomaceous earth or radioactive substances.

The shaft body according to any one of claims 1 to 6, wherein the shaft body is a writing instrument.