JP3946339B2 - Manufacturing method for caps such as writing utensils - Google Patents

Manufacturing method for caps such as writing utensils Download PDF

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Publication number
JP3946339B2
JP3946339B2 JP06233098A JP6233098A JP3946339B2 JP 3946339 B2 JP3946339 B2 JP 3946339B2 JP 06233098 A JP06233098 A JP 06233098A JP 6233098 A JP6233098 A JP 6233098A JP 3946339 B2 JP3946339 B2 JP 3946339B2
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Japan
Prior art keywords
pin
cap body
cap
convex portion
convex
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JP06233098A
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JPH11240289A (en
Inventor
孝男 稲葉
秀之 田中
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Pilot Ink Co Ltd
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Pilot Ink Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は筆記具等のキャップの製造方法に関する。さらに詳細には、製造工程でキャップ本体の周方向の向きを一定にすることが容易な筆記具等のキャップの製造方法に関する。
【0002】
【従来の技術】
従来の筆記具等のキャップは、例えば、クリップや頭冠等の取付工程、外装印刷工程、シール貼付工程等の製造組立工程において、キャップ本体の周方向の向きを一定に揃える工程(即ち、周方向の方向づけ工程)が必要である。
【0003】
そのため、従来では、キャップ本体の外面の異形状部分を機械的に接触・検知して、周方向の向きを揃える方法が採用されている。しかし、この方法では、キャップ本体外面を傷つけ、商品価値を低下させるおそれがあるし、また、キャップ本体が明確な異形状部分を備えない円筒体である場合、この方法では、確実な方向づけが困難である。
【0004】
【発明が解決しようとする課題】
本発明は前記従来の課題を解決するものであって、キャップ本体外面を傷つけず、しかも、キャップ本体の形状に関係なく確実かつ容易な周方向の方向づけが可能な筆記具等のキャップの製造方法を提供しようとするものである。
【0005】
尚、本発明において「前方」とはキャップ閉塞側を指し、「後方」とはキャップ開口側を指す。また、「縦断面」とは、軸線に沿って切断した面を指し、「横断面」とは、軸線に対して垂直に切断した面を指す。
【0006】
【課題を解決するための手段】
【0007】
【0008】
【0009】
【0010】
【0011】
【0012】
本願の発明の筆記具等のキャップの製造方法は、キャップ本体2内面に、該キャップ本体2内面の横断面形状が軸心に対して非点対称形状となる凹凸部3を設け、一方、前記キャップ本体2内に挿入可能なピン4の前端面に、前記キャップ本体2内面の凹凸部3と係合可能な凸凹部5を、該ピン4の前端面の形状が軸心に対して非点対称形状となるよう設けてなり、前記キャップ本体2内に前記ピン4を挿入し、前記キャップ本体2の凹凸部3の凸部31の後端面と前記ピン4の凸凹部5の凸部51の前端面とを圧接状態にさせると同時に前記キャップ本体2と前記ピン4とを相対回転させることにより、前記凹凸部3と前記凸凹部5とを係合させ、前記キャップ本体2の周方向の向きを一定にし、前記キャップ本体2の周方向の向きを一定にした後、前記キャップ本体2にクリップ6を取り付けてなること(請求項)を要件とする。
【0013】
前記請求項の製造方法は、キャップ本体2外面でなくキャップ本体2内面に、方向づけ用の凹凸部3を形成したことにより、方向づけ工程でキャップ本体2外面に傷を付けて商品価値を低下させるおそれがない。また、前記凹凸部3は、キャップ本体2内面の横断面形状をキャップ本体2の軸心に対して非点対称形状にし、一方、前記凸凹部5は、ピン4前端面の形状をピン4の軸心に対して非点対称形状にする。それにより、前記キャップ本体2(凹凸部3)と前記ピン4前端面(凸凹部5)は一通りの係合をし、キャップ本体2の形状に関係なく(例えばキャップ本体2の外面が横断面円形状であっても)、確実な方向づけが可能となる。なぜなら、もし、本発明とは逆に、凹凸部3を軸心に対して点対称形状となるよう設けた場合、あるいは、凸凹部5を軸心に対して点対称形状となるよう設けた場合、所望する方向とは反対の方向を検出してしまうおそれがあり、確実な方向づけができないからである。
前記請求項1の製造方法の場合(即ち、キャップ本体2外面にクリップ6を取り付けるタイプのキャップである場合)、クリップ取付工程前に、キャップ本体2の周方向の向きを一定に揃えることが、製造工程の高能率を維持するには必須である。そのため、前記請求項1の製造方法は、前記製造方法から生じる作用効果(即ち、キャップ本体2外面の傷付き防止効果、確実且つ容易な方向づけ効果)が特に有効に発揮される。
【0014】
また、前記請求項の筆記具等のキャップの製造方法において、キャップ本体2の凸部31の後端面及びピン4の凸部51の前端面が軸線に対して垂直であること(請求項)が好ましい。
【0015】
それにより、前記請求項の製造方法は、キャップ本体2の周方向の方向づけ工程において、キャップ本体2の凸部31後端面とピン4の凸部51前端面とを圧接させた際、キャップ本体2の凸部31の後端面とピン4の凸部51の前端面との食いつきを防止でき、キャップ本体2とピン4との円滑な相対回転が可能となる。なぜなら、もし、キャップ本体2の凸部31後端面又はピン4の凸部51前端面が傾斜面であると、キャップ本体2とピン4とを圧接させた際、凸部31後端面と凸部51前端面とが食いつき、凸部31と凸部51の圧接状態でのキャップ本体2とピン4との円滑な回転が妨げられ、製造工程の能率を低下させるおそれがあるからである。
【0016】
【0017】
【0018】
・その他の説明
(凹凸部、凸凹部)
前記キャップ本体2内面の凹凸部3の形状は、キャップ本体2の軸心に対して非点対称形状、即ち、凹凸部3の位置するキャップ本体2内面の横断面形状が、軸心に対して180度の回転移動をさせても一致しない形状であれば、いずれの形状でもよい。同様に、前記ピン4前端面の凸凹部5の形状は、ピン4の軸心に対して非点対称形状、即ち、凸凹部5の位置するピン4前端面の形状が、軸心に対して180度の回転移動をさせても一致しない形状であれば、いずれの形状でもよい。
【0019】
キャップ本体2の凹凸部3、ピン4の凸凹部5は、それぞれ、軸方向に凸設又は凹設される凸部31・51と凹部32・52とからなり、その位置するキャップ本体2内面の横断面形状、またはピン4前端面の形状が軸心に対して非点対称形状であるならば、形状、個数等適宜である。例えば、前記凸部31・51の形状は、例えば、突起、リブ、***部等が挙げられ、また、前記凹部32・52の形状は、例えば、溝、スリット、孔、切り欠き等が挙げられる。また、凸部31・51、凹部32・52の個数についても、例えば、複数の凸部31・51や複数の凹部32・52により構成されてもよい。
【0020】
また、凸部31・51及び凹部32・52の大小関係は、例えば、小さい凸部31・51と大きい凹部32・52とからなる凹凸部3(例えば、図1のキャップ本体2、図13のピン4)、大きい凸部31・51と小さい凹部32・52とからなる凹凸部3(例えば、図11のキャップ本体2、図10のピン4)、あるいは凸部31・51と凹部32・52とが等しい大きさの凹凸部3(例えば、半円状の凸部と凹部)等が挙げられる。
【0021】
(キャップ本体)
キャップ本体2の内面の凹凸部3を設ける位置は、例えば、キャップ本体2の前端部(即ちキャップ本体2頂壁内面)、又はキャップ本体2の中間部(即ちキャップ本体2周壁内面)が挙げられ、その中でも、キャップ本体2の中間部に、周壁内面から径方向内方に突出するよう凸部31を形成することが好ましく、それにより、ピン4の凹部52との安定した係合ができると共に、ピン4の加工が容易な溝形状の凹部52にすることが可能となる。また、前記凹凸部3は、合成樹脂製のキャップ本体2と一体に設けることが構造が簡易となる点で好ましいが、別部材の取り付けによって形成することもできる。
【0022】
また、キャップ本体2には、凹凸部3後方の内周面に、ピン4外周面と円滑に摺動するガイド部21を設け、前記ガイド部21によって、キャップ本体2とピン4との相対回転の際、ピン4軸心とキャップ本体2軸心とを略一致させ、ピン4とキャップ本体2とのぐらつきを抑えることが好ましい。また、キャップ本体2内面より突出する凸部31は、前記した周方向の方向づけをする機能の他、ペン先シール部材やインナーキャップを支持する機能や、キャップ1を軸筒本体へ装着させた際の軸筒前端面との軸方向の当接をするストッパ機能を兼ねることもできる。尚、キャップ本体2の横断面形状は、円形、楕円形、三角形、四角形、多角形、凹凸状等のいずれであってもよいが、特に円形状の場合に本発明は最適となる。
【0023】
(ピン)
ピン4は、キャップ本体2内部に挿入した際、キャップ本体2内周面との円滑な摺動回転が得られる点で、横断面円形状を有する円柱形状又は円錐形状が好ましい。なぜなら、横断面が非円形状であると、相対回転時、ピン4外周面とキャップ本体2内周面とが引っ掛かり、滑らかな回転を阻害するおそれがあるからである。尚、ピン4は、耐久性に優れた強度を有する点で、金属製であることが好ましい。
【0024】
(相対回転)
キャップ本体2とピン4とを相対回転させる具体的手段としては、キャップ本体2もしくはピン4の一方を回転させ他方を静止させる方法、または両者を互いに逆方向に回転させる方法等、挙げられるがどちらでもよい。
【0025】
(圧接状態)
キャップ本体2とピン4とを圧接させるには、キャップ本体2とピン4とが相対的に軸方向の圧接状態にあればよく、その具体的手段としては、ピン4を軸方向の静止状態とすると同時にキャップ本体2を軸方向後方に付勢する方法、キャップ本体2を軸方向の静止状態とすると同時にピン4を軸方向前方に付勢する方法、またはキャップ本体2を軸方向後方に付勢すると同時にピン4を軸方向前方に付勢する方法等、適宜である。また、キャップ本体2またはピン4を軸方向に付勢する手段としては、例えば、外方からの積極的な付勢手段(例えば、バネ等の弾発体によるもの、重り等の重力によるもの等)やキャップ本体2の自重によるもの等、挙げられるが、前記積極的な付勢手段を採用する方が、方向づけスピード(能率)をより一層向上できる点で好ましい。
【0026】
(筆記具等)
尚、本発明のキャップ1は、ペン先(又は塗布先)を保護したり、密封するものであり、例えば、ボールペン、マーキングペン、万年筆、パイプペン、鉛筆、修正ペン等の筆記具、アイライナー、ヘアマーカー等の化粧具、接着剤、各種薬剤等の塗布具などに採用され、特にキャップ本体2外面にクリップを備えた携帯性を有するものが有効である。
【0027】
【発明の実施の形態】
(1)第1実施例
本発明の筆記具等のキャップの製造方法の第1実施例を説明する(図1〜10参照)。
【0028】
(キャップ本体)
キャップ本体2は、合成樹脂の射出成形により得られる有底円筒体である。前記キャップ本体2外面には、クリップ取付孔26が軸方向前方に開口され、そこに金属製クリップ6が挿着により取り付けられている。前記合成樹脂としては、例えば、ポリプロピレン、ポリエチレン、ポリカーボネート、ポリエチレンテレフタレート等が挙げられる。
【0029】
(凹凸部)
キャップ本体2の頂壁内面から周壁内面にかけて、複数本(ここでは6本)の軸方向に延びるリブ25が等間隔に一体に設けられている。前記1本のリブ25の中間部には、他のリブ25より厚肉且つ径方向内方に大きく突出する段形状の凸部31が形成され、その位置するキャップ本体2内面の横断面形状(図2参照)を軸心に対して非点対称形状としている。それと同時に、前記凸部31の周り(即ち周方向の残部の空間)には凹部32が形成され、前記凸部31と前記凹部32により凹凸部3が構成される。尚、前記凸部31の後端面はキャップ本体2の軸心に対して垂直面となっている。
【0030】
前記凸部31を備える1本のリブ25の肉厚は、他の5本のリブ25より厚く形成されている。それにより、ピン4との係合回転時、凸部31が折れないよう凸部31の強度を補強できるとともに、前記凸部31の位置するキャップ本体2内面の横断面形状を非点対称形状にすることに寄与できる。
【0031】
前記キャップ本体2の凸部31は、クリップ取付孔26とそれぞれの周方向の位置を一致させている。それにより、クリップ6取り付け前に各キャップ本体2のクリップ6の取り付け位置を揃える方向づけ装置において、ピン4のセッティングが容易となる。
【0032】
(ガイド部)
また、前記凸部31後方の各リブ25の径方向内面は、軸心からの距離が等しく設定され、それにより、横断面円形状のピン4外周面と円滑に摺動するガイド部21を形成している。前記ガイド部21の内径(即ち、ガイド部21を構成する各リブ25の内面に接する仮想内接円の直径)は、横断面円形状のピン4前端部の外径より僅かに大きい内径に設定されている。前記ガイド部21によって、キャップ本体2とピン4との相対回転の際、ピン4の軸心とキャップ本体2の軸心とが略一致される。それにより、相対回転の際、ピン4とキャップ本体2とのぐらつきが抑制される。
【0033】
(支持部)
前記凸部31の前方のリブ25径方向内面の各箇所(ここでは6箇所)には、弾性体よりなるペン先シール部材7の径方向外面を嵌合保持する支持部23が、前記凸部31より小さい内径位置に形成される。
【0034】
(ストッパ部)
前記凸部31の後方のリブ25後端面の各箇所(ここでは6箇所)には、軸筒前端と軸方向に当接する直角段形状のストッパ部24が、凸部31より大きい内径位置に形成されている。
【0035】
(当接部)
前記キャップ本体2内面の凸部31前方には、キャップ本体2の凹凸部3とピン4の凸凹部5の係合が完了したときにピン4前端面と当接する当接部22が形成されている。ここでは、凸部31前方のリブ25(具体的にはリブ25のテーパ状後側面)によって設けられている。
【0036】
(ピン)
本実施例に使用するピン4は、金属製棒状体であり、その前端部は、円柱状となっている。前記ピン4前端部には、軸方向前方に開口し且つ径方向外方に開口する溝状の凹部52が形成される。前記ピン4の凹部52は、キャップ本体2の凸部31と係合可能な大きさに形成されている(図10参照)。即ち、ピン4の凹部52の溝幅寸法は、キャップ本体2の凸部31の周方向の肉厚より僅かに大きく設定されている。また、前記凹部52は、孔形状よりも本実施例のような径方向外方に開口する溝形状の方が、ピン4の加工が容易な点で好ましい。
【0037】
また、前記凹部52を設けたピン4前端面の残部(凹部52の周り)には、前記凹部52開口部より大面積の凸部51が形成される。即ち、前記凸部51と前記凹部52により凸凹部5が構成される。尚、前記凸部51の前端面(ピン4前端面)は、ピン4の軸線に対して垂直面となっている。さらに、前記ピン4の前端部の外径は、キャップ本体2のガイド部21と円滑に摺動するよう、ガイド部21の内径より僅かに小径に設定されている。
【0038】
(製造方法)
前記第1実施例の製造方法を図面に従い説明する(図4〜図9参照)。
【0039】
(係合前の状態)
前記ピン4の前端部を前記キャップ本体2内へその開口部より挿入し、ピン4の前端部外周面とキャップ本体2のガイド部21内周面に位置させる。そして、ピン4の凸部51前端面とキャップ本体2の凸部31後端面とを軸方向の圧接状態にさせると同時に、ピン4とキャップ本体2とを相対回転させる。このとき、ピン4の凸部51前端面とキャップ本体2の凸部31後端面は、軸線に対して垂直面であるため、互いに食いつくことがなく、その上、キャップ本体2のガイド部21によってピン4前端部とキャップ本体2とのぐらつきが防止されるため、円滑な相対回転がなされる。(図4〜図6参照)
【0040】
(係合後の状態)
前記ピン4とキャップ本体2との相対回転の後、前記キャップ本体2の凸部31が前記ピン4の凹部52に挿入されると同時にピン4の凸部51がキャップ本体2の凹部32に挿入され、ピン4の凸凹部5とキャップ本体2の凹凸部3が係合状態となる。このとき、ピン4の凸部51前端面(ピン4前端面)は、キャップ本体2の当接部22と軸方向の当接状態にある。(図7〜図9参照)
【0041】
(2)第2実施例
本発明の筆記具等のキャップの製造方法の第2実施例を説明する(図11〜15参照)。
【0042】
(キャップ本体)
キャップ本体2は、合成樹脂の射出成形により得られる有底円筒体である。前記キャップ本体2外面には、クリップ取付孔26が軸方向前方に開口され、そこに金属製クリップ6が挿着により取り付けられている。前記合成樹脂としては、例えば、ポリプロピレン、ポリエチレン、ポリカーボネート、ポリエチレンテレフタレート等が挙げられる。
【0043】
(凹凸部)
キャップ本体2の頂壁内面には、比較的小さい凹部32と、その残部の比較的大きい軸方向後方に突出する凸部31とからなる凹凸部3が一体に設けられる。前記凹凸部3の位置するキャップ本体2内面の横断面形状は、軸心に対して非点対称形状である。また、前記凸部31の後端面はキャップ本体2の軸心に対して垂直面となっている。
【0044】
また、前記キャップ本体2の凸部31は、クリップ取付孔26と、周方向の位置を一致させている。それにより、クリップ6取り付け前に各キャップ本体2のクリップ6の取り付け位置を揃える方向づけ装置において、ピン4のセッティングが容易となる。
【0045】
(ガイド部)
また、前記凸部31後方のキャップ本体2内周面は、ピン4外周面と摺接可能な横断面円形状のガイド部21が形成される。前記ガイド部21によって、キャップ本体2とピン4との相対回転の際、ピン4の軸心とキャップ本体2の軸心とが略一致される。それにより、相対回転の際、ピン4とキャップ本体2とのぐらつきが抑制される。
【0046】
(当接部)
前記キャップ本体2の頂壁内面(即ち凸部31後端面及び凹部32底面)は、キャップ本体2の凹凸部3とピン4の凸凹部5の係合が完了したときにピン4前端面と軸方向に当接する当接部22となっている。
【0047】
(ピン)
本実施例に使用するピン4は、円柱状の金属製棒状体であり、前記ピン4の前端面には、軸方向前方に突出する比較的小さい凸部51とその残部の凹部52とからなる凸凹部5が形成される。前記ピン4の凸部51は、キャップ本体2の凹部32と係合可能な大きさに形成されているとともに、その前端面は、ピン4の軸線に対して垂直面となっている。また、前記ピン4の外径は、キャップ本体2のガイド部21と円滑に摺動するよう、前記ガイド部21の内径より僅かに小径に設定されている。
【0048】
(製造方法)
前記第2実施例の製造方法を図面に従い説明する。(図13〜図15参照)
【0049】
(係合前の状態)
前記ピン4の前端部を前記キャップ本体2内へその開口部より挿入し、ピン4の前端部外周面とキャップ本体2のガイド部21内周面に位置させる。そして、ピン4の凸部51前端面とキャップ本体2の凸部31後端面とを軸方向の圧接状態にさせると同時に、ピン4とキャップ本体2とを相対回転させる。このとき、ピン4の凸部51前端面とキャップ本体2の凸部31後端面は、軸線に対して垂直面であるため、互いに食いつくことがなく、その上、キャップ本体2のガイド部21によって、ピン4前端部とキャップ本体2とのぐらつきが防止されるため、円滑な相対回転がなされる。(図13参照)
【0050】
(係合後の状態)
前記ピン4とキャップ本体2との相対回転の後、前記キャップ本体2の凸部31が前記ピン4の凹部52に挿入され(且つピン4の凸部51がキャップ本体2の凹部32に挿入され)、ピン4の凸凹部5とキャップ本体2の凹凸部3が係合状態となる。このとき、ピン4の前端面は、キャップ本体2の頂壁(当接部22)と軸方向の当接状態にある。(図14〜図15参照)
【0051】
【発明の効果】
【0052】
【0053】
【0054】
本発明は、請求項の筆記具等のキャップの製造方法によって、キャップ外面を傷つけず、キャップ本体の形状に関係なく確実かつ容易な周方向の方向づけが可能である。
本発明は、請求項1の筆記具等のキャップの製造方法によって、クリップ取付工程前に、キャップ本体の周方向の向きを一定に揃えることが、製造工程の高能率を維持するには必須となるため、請求項1の製造方法は、前記製造方法から生じる前記効果(即ち、キャップ本体外面の傷付き防止効果、確実且つ容易な方向づけ効果)が特に有効に発揮される。
【0055】
本発明は、請求項の筆記具等のキャップの製造方法によって、キャップ本体の周方向の方向づけ工程において、キャップ本体の凸部後端面とピンの凸部前端面とを圧接させた際、キャップ本体の凸部の後端面とピンの凸部の前端面との食いつきを防止でき、円滑なキャップとピンとの相対回転が可能となる。
【0056】
【図面の簡単な説明】
【図1】本発明のキャップの第1実施例を示す縦断面図である。
【図2】図1のA−A拡大断面図である。
【図3】図1のB−B拡大断面図である。
【図4】本発明のキャップの製造方法の第1実施例の係合前の状態を示す縦断面図である。
【図5】図4のP部拡大図である。
【図6】図4のC−C拡大断面図である。
【図7】本発明のキャップの製造方法の第1実施例の係合後の状態を示す縦断面図である。
【図8】図7のQ部拡大図である。
【図9】図7のD−D拡大断面図である。
【図10】図4〜図9のピンの(a)平面図、(b)正面図である。
【図11】本発明のキャップの第2実施例を示す縦断面図である。
【図12】図11のE−E矢視拡大断面図である。
【図13】本発明のキャップの製造方法の第2実施例の係合前の状態を示す縦断面図である。
【図14】本発明のキャップの製造方法の第2実施例の係合後の状態を示す縦断面図である。
【図15】図14のF−F矢視拡大断面図である。
【符号の説明】
1 キャップ
2 キャップ本体
21 ガイド部
22 当接部
23 支持部
24 ストッパ部
25 リブ
26 クリップ取付孔
3 凹凸部
31 凸部
32 凹部
4 ピン
5 凸凹部
51 凸部
52 凹部
6 クリップ
7 ペン先シール部材
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a process for the production of caps, such as writing instruments. More particularly, to a method of manufacturing a cap such as easy writing instrument to a certain circumferential direction of the cap body in the manufacturing process.
[0002]
[Prior art]
A conventional cap such as a writing instrument is, for example, a process of aligning the circumferential direction of the cap body in a manufacturing and assembly process such as an attachment process of a clip or a crown, an exterior printing process, a seal sticking process (i.e., a circumferential direction). Directing step) is necessary.
[0003]
Therefore, conventionally, a method of mechanically contacting and detecting an irregularly shaped portion on the outer surface of the cap body to align the circumferential direction is employed. However, with this method, there is a risk that the outer surface of the cap body may be damaged and the commercial value may be reduced. In addition, when the cap body is a cylindrical body that does not have a clear irregularly shaped portion, it is difficult to ensure a reliable orientation with this method. It is.
[0004]
[Problems to be solved by the invention]
The present invention has been made to solve the conventional problems above, the cap without damaging the outer body surface, moreover, the manufacturing method of the cap, such that can reliably and easily circumferential direction of the oriented writing instruments regardless the shape of the cap body Is to provide.
[0005]
In the present invention, “front” refers to the cap closing side, and “rear” refers to the cap opening side. The “longitudinal section” refers to a plane cut along the axis, and the “cross section” refers to a plane cut perpendicular to the axis.
[0006]
[Means for Solving the Problems]
[0007]
[0008]
[0009]
[0010]
[0011]
[0012]
Method of manufacturing a cap, such as application of inventions of writing instruments, the cap body 2 internal surface, is provided an uneven portion 3 which cross-sectional shape of the cap body 2 internal surface is point-asymmetrical shape with respect to the axis, whereas the On the front end surface of the pin 4 that can be inserted into the cap body 2, a convex recess 5 that can be engaged with the concave and convex portion 3 on the inner surface of the cap body 2 is formed. The shape of the front end surface of the pin 4 is astigmatic with respect to the axis. The pin 4 is inserted into the cap body 2, and the rear end surface of the convex portion 31 of the concave and convex portion 3 of the cap main body 2 and the convex portion 51 of the convex concave portion 5 of the pin 4 are provided. The cap body 2 and the pin 4 are rotated relative to each other while the front end surface is brought into a pressure contact state, thereby engaging the concave and convex portion 3 and the convex concave portion 5, so that the circumferential direction of the cap main body 2 is increased. was constant, constant circumferential direction of the cap body 2 After, and the requirements to become attached to the clip 6 to the cap body 2 (claim 1).
[0013]
In the manufacturing method of claim 1 , the unevenness portion 3 for orientation is formed not on the outer surface of the cap body 2 but on the inner surface of the cap body 2, so that the outer surface of the cap body 2 is damaged in the orientation process and the commercial value is lowered. There is no fear. Further, the concave and convex portion 3 makes the cross-sectional shape of the inner surface of the cap body 2 an asymmetrical shape with respect to the axis of the cap body 2, while the convex concave portion 5 has the shape of the front end face of the pin 4 as that of the pin 4. Asymmetrical with respect to the axis. Thereby, the cap body 2 (uneven portion 3) and the front end surface (convex recessed portion 5) of the pin 4 are engaged with each other, regardless of the shape of the cap body 2 (for example, the outer surface of the cap body 2 has a cross section). Even in the case of a circle), a reliable orientation is possible. This is because, contrary to the present invention, when the concave and convex portion 3 is provided so as to be point-symmetric with respect to the axis, or when the convex / concave portion 5 is provided so as to be point-symmetric with respect to the axis. This is because a direction opposite to the desired direction may be detected, and reliable orientation cannot be achieved.
In the case of the manufacturing method according to claim 1 (that is, a cap of the type in which the clip 6 is attached to the outer surface of the cap body 2), the circumferential direction of the cap body 2 is made uniform before the clip attaching step. It is essential to maintain the high efficiency of the manufacturing process. For this reason, the manufacturing method of claim 1 is particularly effective in achieving the effects (that is, the effect of preventing the outer surface of the cap body 2 from being scratched, the reliable and easy orientation effect) resulting from the manufacturing method.
[0014]
Moreover, in the manufacturing method of caps, such as the writing instrument of the said Claim 1 , the rear-end surface of the convex part 31 of the cap main body 2 and the front-end surface of the convex part 51 of the pin 4 are perpendicular | vertical with respect to an axis (Claim 2 ). Is preferred.
[0015]
Thereby, in the manufacturing method of the said Claim 2 , in the orientation process of the circumferential direction of the cap main body 2, when the convex part 31 rear end surface of the cap main body 2 and the convex part 51 front end surface of the pin 4 are press-contacted, Biting between the rear end surface of the second convex portion 31 and the front end surface of the convex portion 51 of the pin 4 can be prevented, and smooth relative rotation between the cap body 2 and the pin 4 becomes possible. Because, if the rear end surface of the convex portion 31 of the cap body 2 or the front end surface of the convex portion 51 of the pin 4 is an inclined surface, the rear end surface of the convex portion 31 and the convex portion when the cap body 2 and the pin 4 are brought into pressure contact with each other. This is because the front end face of the 51 bites and the smooth rotation of the cap body 2 and the pin 4 in the pressure contact state between the convex portion 31 and the convex portion 51 is hindered, which may reduce the efficiency of the manufacturing process.
[0016]
[0017]
[0018]
- other description of its (concave and convex portions, convex and concave portions)
The shape of the concavo-convex portion 3 on the inner surface of the cap body 2 is asymmetric with respect to the axis of the cap body 2, that is, the cross-sectional shape of the inner surface of the cap body 2 where the concavo-convex portion 3 is located is Any shape may be used as long as it does not match even if it is rotated 180 degrees. Similarly, the shape of the convex recess 5 on the front end surface of the pin 4 is asymmetric with respect to the axis of the pin 4, that is, the shape of the front end surface of the pin 4 where the convex recess 5 is located is about the axis. Any shape may be used as long as it does not match even if it is rotated 180 degrees.
[0019]
The concave / convex portion 3 of the cap body 2 and the convex / concave portion 5 of the pin 4 are respectively composed of convex portions 31/51 and concave portions 32/52 that are projected or recessed in the axial direction. If the cross-sectional shape or the shape of the front end face of the pin 4 is asymmetric with respect to the axis, the shape, number, etc. are appropriate. For example, the shape of the convex portions 31 and 51 includes, for example, a projection, a rib, and a raised portion, and the shape of the concave portions 32 and 52 includes, for example, a groove, a slit, a hole, and a notch. . Further, the number of the convex portions 31 and 51 and the concave portions 32 and 52 may be configured by a plurality of convex portions 31 and 51 and a plurality of concave portions 32 and 52, for example.
[0020]
In addition, the magnitude relationship between the convex portions 31 and 51 and the concave portions 32 and 52 is, for example, the concave and convex portion 3 (for example, the cap main body 2 in FIG. 1, FIG. 13) including the small convex portions 31 and 51 and the large concave portions 32 and 52. Pin 4), concave and convex portion 3 (for example, cap body 2 in FIG. 11, pin 4 in FIG. 10), or convex portions 31 and 51 and concave portions 32 and 52 comprising large convex portions 31 and 51 and small concave portions 32 and 52. And uneven portions 3 (for example, semicircular convex portions and concave portions) having the same size.
[0021]
(Cap body)
Examples of the position where the uneven portion 3 on the inner surface of the cap body 2 is provided include the front end portion of the cap body 2 (that is, the inner surface of the top wall of the cap body 2) or the middle portion of the cap body 2 (that is, the inner surface of the peripheral wall of the cap body 2). Of these, it is preferable to form the convex portion 31 at the intermediate portion of the cap body 2 so as to project radially inward from the inner surface of the peripheral wall, thereby enabling stable engagement with the concave portion 52 of the pin 4. It becomes possible to form the groove-shaped recess 52 in which the processing of the pin 4 is easy. Moreover, although the said uneven | corrugated | grooved part 3 is preferable at the point from which a structure becomes simple to provide with the cap main body 2 made from a synthetic resin, it can also form by attachment of another member.
[0022]
The cap body 2 is provided with a guide portion 21 that slides smoothly on the outer peripheral surface of the pin 4 on the inner peripheral surface behind the concavo-convex portion 3, and relative rotation between the cap main body 2 and the pin 4 is performed by the guide portion 21. At this time, it is preferable that the pin 4 axis and the cap body 2 axis are substantially aligned with each other to prevent the pin 4 and the cap body 2 from wobbling. Further, the convex portion 31 protruding from the inner surface of the cap body 2 has a function of supporting the pen tip seal member and the inner cap in addition to the function of orienting in the circumferential direction described above, and when the cap 1 is attached to the shaft cylinder body. It can also serve as a stopper function for making axial contact with the front end surface of the cylinder. The cross-sectional shape of the cap body 2 may be any of a circular shape, an elliptical shape, a triangular shape, a quadrangular shape, a polygonal shape, an uneven shape, and the like. However, the present invention is optimal particularly in the case of a circular shape.
[0023]
(pin)
The pin 4 is preferably a columnar shape or a conical shape having a circular cross section in that the pin 4 can be smoothly slid and rotated with the inner peripheral surface of the cap body 2 when inserted into the cap body 2. This is because if the cross section is non-circular, the pin 4 outer peripheral surface and the cap main body 2 inner peripheral surface are caught during relative rotation, and smooth rotation may be hindered. In addition, it is preferable that the pin 4 is metal from the point which has the intensity | strength excellent in durability.
[0024]
(Relative rotation)
Specific means for relatively rotating the cap body 2 and the pin 4 include a method in which one of the cap body 2 and the pin 4 is rotated and the other is stationary, or a method in which both are rotated in opposite directions. But you can.
[0025]
(Pressure contact state)
In order to press the cap body 2 and the pin 4 in pressure contact, the cap body 2 and the pin 4 only need to be in a relatively axial pressure contact state. As a specific means, the pin 4 is placed in an axially stationary state. Simultaneously urging the cap body 2 axially rearward, making the cap body 2 axially stationary, and simultaneously urging the pin 4 axially forward, or urging the cap body 2 axially rearward At the same time, a method of urging the pin 4 forward in the axial direction is appropriate. Further, as means for urging the cap body 2 or the pin 4 in the axial direction, for example, positive urging means from the outside (for example, a spring or other elastic member, a weight or the like due to gravity, etc.) ) And due to the dead weight of the cap body 2, etc., it is preferable to employ the positive urging means in terms of further improving the orientation speed (efficiency).
[0026]
(Writing instruments, etc.)
The cap 1 of the present invention protects or seals the pen tip (or application tip). For example, a writing instrument such as a ballpoint pen, marking pen, fountain pen, pipe pen, pencil, correction pen, eyeliner, hair Adopted for cosmetic tools such as markers, adhesives, applicators for various drugs, and the like, particularly those having a portability provided with a clip on the outer surface of the cap body 2 are effective.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
(1) explaining a first embodiment of a method for manufacturing a cap, such as the writing instrument of the first embodiment the present invention (see FIGS. 1-10).
[0028]
(Cap body)
The cap body 2 is a bottomed cylindrical body obtained by injection molding of synthetic resin. On the outer surface of the cap body 2, a clip mounting hole 26 is opened forward in the axial direction, and a metal clip 6 is mounted thereon by insertion. Examples of the synthetic resin include polypropylene, polyethylene, polycarbonate, polyethylene terephthalate, and the like.
[0029]
(Uneven portion)
A plurality (six in this case) of ribs 25 extending in the axial direction are integrally provided at equal intervals from the top wall inner surface of the cap body 2 to the peripheral wall inner surface. A step-shaped convex portion 31 that is thicker than the other ribs 25 and protrudes greatly inward in the radial direction is formed in the middle portion of the one rib 25, and the cross-sectional shape ( 2) has an asymmetrical shape with respect to the axis. At the same time, a concave portion 32 is formed around the convex portion 31 (that is, the remaining space in the circumferential direction), and the concave and convex portion 3 is constituted by the convex portion 31 and the concave portion 32. The rear end surface of the convex portion 31 is a surface perpendicular to the axis of the cap body 2.
[0030]
The thickness of one rib 25 including the convex portion 31 is formed to be thicker than the other five ribs 25. Thereby, the strength of the convex part 31 can be reinforced so that the convex part 31 does not break during the engagement rotation with the pin 4, and the cross-sectional shape of the inner surface of the cap body 2 where the convex part 31 is located is made asymmetrical. Can contribute.
[0031]
The convex portion 31 of the cap body 2 is aligned with the clip mounting hole 26 in the circumferential direction. Thereby, in the orientation device that aligns the attachment positions of the clips 6 of the cap bodies 2 before the clips 6 are attached, the setting of the pins 4 is facilitated.
[0032]
(Guide part)
Further, the radial inner surfaces of the ribs 25 behind the convex portion 31 are set to have the same distance from the axial center, thereby forming a guide portion 21 that slides smoothly with the outer peripheral surface of the pin 4 having a circular cross section. is doing. The inner diameter of the guide portion 21 (that is, the diameter of a virtual inscribed circle in contact with the inner surface of each rib 25 constituting the guide portion 21) is set to an inner diameter slightly larger than the outer diameter of the front end portion of the pin 4 having a circular cross section. Has been. The guide portion 21 causes the axis of the pin 4 and the axis of the cap body 2 to substantially coincide with each other when the cap body 2 and the pin 4 are rotated relative to each other. Thereby, the wobble between the pin 4 and the cap body 2 is suppressed during relative rotation.
[0033]
(Support part)
At each location (six locations here) on the radially inner surface of the rib 25 in front of the convex portion 31, a support portion 23 that fits and holds the radial outer surface of the nib seal member 7 made of an elastic body is provided on the convex portion. The inner diameter position is smaller than 31.
[0034]
(Stopper part)
At each location (six locations here) on the rear end surface of the rib 25 behind the convex portion 31, a right-angled stopper portion 24 that abuts the front end of the shaft tube in the axial direction is formed at an inner diameter position larger than the convex portion 31. Has been.
[0035]
(Contact part)
In front of the convex portion 31 on the inner surface of the cap body 2, a contact portion 22 that contacts the front end surface of the pin 4 when the concave and convex portion 3 of the cap body 2 and the convex concave portion 5 of the pin 4 are completed is formed. Yes. Here, the rib 25 is provided in front of the convex portion 31 (specifically, the tapered rear side surface of the rib 25).
[0036]
(pin)
The pin 4 used for a present Example is a metal rod-shaped body, The front-end part is a column shape. A groove-like recess 52 is formed at the front end of the pin 4 so as to open forward in the axial direction and outward in the radial direction. The concave portion 52 of the pin 4 is formed in a size that can be engaged with the convex portion 31 of the cap body 2 (see FIG. 10). That is, the groove width dimension of the concave portion 52 of the pin 4 is set to be slightly larger than the circumferential thickness of the convex portion 31 of the cap body 2. In addition, the recess 52 is preferably in the form of a groove that opens radially outward as in the present embodiment rather than in the form of a hole in terms of easy processing of the pin 4.
[0037]
Further, a convex portion 51 having a larger area than the opening of the concave portion 52 is formed in the remaining portion (around the concave portion 52) of the front end surface of the pin 4 provided with the concave portion 52. That is, the convex portion 5 is constituted by the convex portion 51 and the concave portion 52. The front end surface of the convex portion 51 (the front end surface of the pin 4) is a surface perpendicular to the axis of the pin 4. Further, the outer diameter of the front end portion of the pin 4 is set to be slightly smaller than the inner diameter of the guide portion 21 so as to slide smoothly with the guide portion 21 of the cap body 2.
[0038]
(Production method)
The manufacturing method of the first embodiment will be described with reference to the drawings (see FIGS. 4 to 9).
[0039]
(State before engagement)
The front end portion of the pin 4 is inserted into the cap main body 2 through the opening, and is positioned on the outer peripheral surface of the front end portion of the pin 4 and the inner peripheral surface of the guide portion 21 of the cap main body 2. Then, the front end surface of the convex portion 51 of the pin 4 and the rear end surface of the convex portion 31 of the cap body 2 are brought into an axial pressure contact state, and at the same time, the pin 4 and the cap body 2 are relatively rotated. At this time, since the front end surface of the convex portion 51 of the pin 4 and the rear end surface of the convex portion 31 of the cap body 2 are perpendicular to the axis, they do not bite each other, and in addition, by the guide portion 21 of the cap body 2 Since the wobbling between the front end portion of the pin 4 and the cap body 2 is prevented, smooth relative rotation is performed. (See Figs. 4-6)
[0040]
(After engagement)
After the relative rotation between the pin 4 and the cap body 2, the convex portion 31 of the cap body 2 is inserted into the concave portion 52 of the pin 4, and at the same time, the convex portion 51 of the pin 4 is inserted into the concave portion 32 of the cap body 2. Then, the convex / concave portion 5 of the pin 4 and the concave / convex portion 3 of the cap body 2 are engaged. At this time, the front end surface of the convex portion 51 of the pin 4 (the front end surface of the pin 4) is in contact with the contact portion 22 of the cap body 2 in the axial direction. (See FIGS. 7-9)
[0041]
(2) explaining the second embodiment of the method of manufacturing the cap, such as writing instrument of the second embodiment the present invention (see FIG. 11-15).
[0042]
(Cap body)
The cap body 2 is a bottomed cylindrical body obtained by injection molding of synthetic resin. On the outer surface of the cap body 2, a clip mounting hole 26 is opened forward in the axial direction, and a metal clip 6 is mounted thereon by insertion. Examples of the synthetic resin include polypropylene, polyethylene, polycarbonate, polyethylene terephthalate, and the like.
[0043]
(Uneven portion)
The inner surface of the top wall of the cap body 2 is integrally provided with a concavo-convex portion 3 including a relatively small concave portion 32 and a relatively large convex portion 31 protruding rearward in the axial direction. The cross-sectional shape of the inner surface of the cap body 2 where the uneven portion 3 is located is asymmetric with respect to the axis. The rear end surface of the convex portion 31 is a surface perpendicular to the axis of the cap body 2.
[0044]
Further, the convex portion 31 of the cap body 2 is aligned with the clip mounting hole 26 in the circumferential direction. Thereby, in the orientation device that aligns the attachment positions of the clips 6 of the cap bodies 2 before the clips 6 are attached, the setting of the pins 4 is facilitated.
[0045]
(Guide part)
Further, the inner peripheral surface of the cap body 2 behind the convex portion 31 is formed with a guide portion 21 having a circular cross section that can be slidably contacted with the outer peripheral surface of the pin 4. The guide portion 21 causes the axis of the pin 4 and the axis of the cap body 2 to substantially coincide with each other when the cap body 2 and the pin 4 are rotated relative to each other. Thereby, the wobble between the pin 4 and the cap body 2 is suppressed during relative rotation.
[0046]
(Contact part)
The inner surface of the top wall of the cap body 2 (that is, the rear end surface of the convex portion 31 and the bottom surface of the concave portion 32) is aligned with the front end surface of the pin 4 when the concave portion 3 of the cap main body 2 and the convex concave portion 5 of the pin 4 are completed. The contact portion 22 is in contact with the direction.
[0047]
(pin)
The pin 4 used in the present embodiment is a cylindrical metal rod-like body, and the front end surface of the pin 4 includes a relatively small convex portion 51 protruding forward in the axial direction and the remaining concave portion 52. Convex recess 5 is formed. The convex portion 51 of the pin 4 is formed in a size that can be engaged with the concave portion 32 of the cap body 2, and the front end surface thereof is a surface perpendicular to the axis of the pin 4. The outer diameter of the pin 4 is set to be slightly smaller than the inner diameter of the guide portion 21 so as to slide smoothly with the guide portion 21 of the cap body 2.
[0048]
(Production method)
The manufacturing method of the second embodiment will be described with reference to the drawings. (See FIGS. 13 to 15)
[0049]
(State before engagement)
The front end portion of the pin 4 is inserted into the cap main body 2 through the opening, and is positioned on the outer peripheral surface of the front end portion of the pin 4 and the inner peripheral surface of the guide portion 21 of the cap main body 2. Then, the front end surface of the convex portion 51 of the pin 4 and the rear end surface of the convex portion 31 of the cap body 2 are brought into an axial pressure contact state, and at the same time, the pin 4 and the cap body 2 are relatively rotated. At this time, since the front end surface of the convex portion 51 of the pin 4 and the rear end surface of the convex portion 31 of the cap body 2 are perpendicular to the axis, they do not bite each other, and in addition, by the guide portion 21 of the cap body 2 Since the wobbling between the front end portion of the pin 4 and the cap body 2 is prevented, smooth relative rotation is performed. (See Figure 13)
[0050]
(After engagement)
After the relative rotation between the pin 4 and the cap body 2, the convex portion 31 of the cap body 2 is inserted into the concave portion 52 of the pin 4 (and the convex portion 51 of the pin 4 is inserted into the concave portion 32 of the cap body 2. ), The concave and convex portions 5 of the pin 4 and the concave and convex portions 3 of the cap body 2 are engaged. At this time, the front end surface of the pin 4 is in contact with the top wall (contact portion 22) of the cap body 2 in the axial direction. (See FIGS. 14 to 15)
[0051]
【The invention's effect】
[0052]
[0053]
[0054]
According to the present invention, the manufacturing method of a cap such as a writing instrument according to claim 1 does not damage the outer surface of the cap and enables reliable and easy circumferential orientation regardless of the shape of the cap body.
In the present invention, it is indispensable to maintain the high efficiency of the manufacturing process by keeping the circumferential direction of the cap body constant before the clip mounting process by the manufacturing method of the cap such as the writing instrument of claim 1. Therefore, the manufacturing method according to claim 1 exhibits the above-mentioned effects (that is, the effect of preventing damage to the outer surface of the cap body and the effect of reliable and easy orientation) particularly effectively.
[0055]
According to the present invention, the cap body of the writing instrument or the like according to claim 2 is pressed when the convex rear end surface of the cap main body and the convex front end surface of the pin are press-contacted in the circumferential direction of the cap main body. Biting between the rear end surface of the convex portion and the front end surface of the convex portion of the pin can be prevented, and the relative rotation between the cap and the pin can be performed smoothly.
[0056]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a cap of the present invention.
2 is an AA enlarged cross-sectional view of FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG.
FIG. 4 is a longitudinal sectional view showing a state before engagement of the first embodiment of the cap manufacturing method of the present invention.
FIG. 5 is an enlarged view of a P part in FIG. 4;
FIG. 6 is an enlarged cross-sectional view taken along the line CC of FIG.
FIG. 7 is a longitudinal sectional view showing a state after engagement of the first embodiment of the cap manufacturing method of the present invention.
FIG. 8 is an enlarged view of a Q part in FIG. 7;
FIG. 9 is an enlarged sectional view taken along the line DD of FIG.
10A is a plan view of the pin of FIGS. 4 to 9, and FIG. 10B is a front view thereof.
FIG. 11 is a longitudinal sectional view showing a second embodiment of the cap of the present invention.
12 is an enlarged cross-sectional view taken along the line E-E in FIG. 11;
FIG. 13 is a longitudinal sectional view showing a state before engagement of a second embodiment of the cap manufacturing method of the present invention.
FIG. 14 is a longitudinal sectional view showing a state after engagement of the second embodiment of the cap manufacturing method of the present invention.
15 is an enlarged cross-sectional view taken along the line F-F in FIG. 14;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap 2 Cap main body 21 Guide part 22 Contact part 23 Support part 24 Stopper part 25 Rib 26 Clip mounting hole 3 Concave part 31 Convex part 32 Concave part 4 Pin 5 Convex concave part 51 Convex part 52 Concave part 6 Clip 7 Pen point sealing member

Claims (2)

キャップ本体(2)内面に、該キャップ本体(2)内面の横断面形状が軸心に対して非点対称形状となる凹凸部(3)を設け、一方、前記キャップ本体(2)内に挿入可能なピン(4)の前端面に、前記キャップ本体(2)内面の凹凸部(3)と係合可能な凸凹部(5)を、該ピン(4)の前端面の形状が軸心に対して非点対称形状となるよう設けてなり、前記キャップ本体(2)内に前記ピン(4)を挿入し、前記キャップ本体(2)の凹凸部(3)の凸部(31)の後端面と前記ピン(4)の凸凹部(5)の凸部(51)の前端面とを圧接状態にさせると同時に前記キャップ本体(2)と前記ピン(4)とを相対回転させることにより、前記凹凸部(3)と前記凸凹部(5)とを係合させ、前記キャップ本体(2)の周方向の向きを一定にし、前記キャップ本体(2)の周方向の向きを一定にした後、前記キャップ本体(2)にクリップ(6)を取り付けてなることを特徴とする筆記具等のキャップの製造方法。The inner surface of the cap body (2) is provided with an uneven portion (3) in which the cross-sectional shape of the inner surface of the cap body (2) is asymmetric with respect to the axis, while being inserted into the cap body (2). On the front end surface of the possible pin (4), a convex concave portion (5) that can be engaged with the concave and convex portion (3) on the inner surface of the cap main body (2) is formed, and the shape of the front end surface of the pin (4) is an axis. The pin (4) is inserted into the cap main body (2), and the convex portion (31) of the concave and convex portion (3) of the cap main body (2) is provided. By bringing the end face and the front end face of the convex part (51) of the convex concave part (5) of the pin (4) into a pressure contact state, and simultaneously rotating the cap body (2) and the pin (4), The concave-convex portion (3) and the concave-convex portion (5) are engaged, and the circumferential direction of the cap body (2) is constant. And, wherein after the circumferential direction of the cap body (2) made constant, the manufacturing method of the cap of the writing instrument such as that characterized by comprising attaching a clip (6) wherein the cap body (2). キャップ本体(2)の凸部(31)の後端面及びピン(4)の凸部(51)の前端面が軸線に対して垂直である請求項1記載の筆記具等のキャップの製造方法。The method for manufacturing a cap such as a writing instrument according to claim 1, wherein the rear end surface of the convex portion (31) of the cap body (2) and the front end surface of the convex portion (51) of the pin (4) are perpendicular to the axis.
JP06233098A 1998-02-25 1998-02-25 Manufacturing method for caps such as writing utensils Expired - Lifetime JP3946339B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06233098A JP3946339B2 (en) 1998-02-25 1998-02-25 Manufacturing method for caps such as writing utensils

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Application Number Priority Date Filing Date Title
JP06233098A JP3946339B2 (en) 1998-02-25 1998-02-25 Manufacturing method for caps such as writing utensils

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Publication Number Publication Date
JPH11240289A JPH11240289A (en) 1999-09-07
JP3946339B2 true JP3946339B2 (en) 2007-07-18

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JP7190235B2 (en) * 2019-03-15 2022-12-15 三菱鉛筆株式会社 cosmetic applicator

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