JP4101569B2

JP4101569B2 - Ballpoint pen and ballpoint pen manufacturing method

Info

Publication number: JP4101569B2
Application number: JP2002189254A
Authority: JP
Inventors: 哲宏栗田
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 2002-06-28
Filing date: 2002-06-28
Publication date: 2008-06-18
Anticipated expiration: 2022-06-28
Also published as: JP2004025779A

Description

【０００１】
【発明の属する技術分野】
本発明は、ボールペン及びボールペンの製造方法に関する。詳細には、内向きの前端縁部により前端部にボールを回転可能に抱持するチップ本体と、前記ボールを前方に押圧し且つ前記ボールを前端縁部の内面に密接させるスプリングとを備えたボールペン及びボールペンの製造方法に関する。尚、本発明で、「前」とは、ペン先側（即ちボール側）を指し、「後」とは、その反対側を指す。
【０００２】
【従来の技術】
従来、この種のボールペンにおいて、スプリングが、ボールを前方に押圧するロッド部と、該ロッド部の後端に連設されるコイル部と、該コイル部の後端部に形成され、前方のコイル部外径より大径の密着巻部とからなり、前記スプリングのロッド部から密着巻部までがチップ本体内に挿入配置される構成が、例えば、特開２０００−２０３１８７号公報に開示されている。
【０００３】
前記タイプのボールペンは、スプリングを非圧縮状態でペン先下向きのチップ本体内に仮挿入した際、スプリングの密着巻部の前端（即ち外側段部）が、前記チップ本体の後端に引っ掛かると同時に、ロッド部の前端またはコイル部の前端が、チップ本体の内面に形成した内側段部に引っ掛かることがある。その場合、スプリングの仮挿入工程で振動等を与えたとしても、容易にその引っ掛かりを解除できず、スプリングがチップ本体内の適正な位置に挿入配置されない、挿入不良が生じるおそれがあった。
【０００４】
【発明が解決しようとする課題】
本発明は、前記従来の問題点を解決するものであって、スプリング仮挿入の際、スプリングの密着巻部の前端がチップ本体の後端に引っ掛かったとしても、スプリングの自重や振動等で容易にその引っ掛かりを解除でき、スプリングの挿入不良の発生を抑えることが可能なボールペンを提供しようとするものである。
【０００５】
【課題を解決するための手段】
〔１〕本発明は、内向きの前端縁部２２により前端部にボール２１を回転可能に抱持するチップ本体２と、前記ボール２１を前方に押圧し且つ前記ボール２１を前端縁部２２の内面に密接させるスプリング３とを備え、前記チップ本体２が、内面に複数の内側段部２４ａを備え、前記スプリング３が、ボール２１の後面に前端が当接されるロッド部３１と、該ロッド部３１の後端に連設されるコイル部３２と、該コイル部３２の後端部に形成される、前方のコイル部３２外径より大径の密着巻部３３と、該密着巻部３３の前端に形成される外側段部３４とを備え、前記スプリング３の少なくともロッド部３１の前端から密着巻部３３の前端の外側段部３４までがチップ本体２内に挿入配置されるタイプのボールペン１であって、前記スプリング３を非圧縮状態でペン先下向きのチップ本体２内に仮挿入した際に、前記密着巻部３３の前端の外側段部３４が前記チップ本体２の後端に当接し、引っ掛かったとき、前記ロッド部３１の前端及び前記コイル部３２の前端が前記チップ本体２内面の内側段部２４ａに非接触であるよう設定され、前記ロッド部３１の前端が内側段部２４ａ以外のチップ本体２内面に当接し、前記コイル部３２の前端がチップ本体２内面に非接触である構成、または、前記コイル部３２の前端が内側段部２４ａ以外のチップ本体２内面に当接し、前記ロッド部３１の前端がチップ本体２内面に非接触である構成であること（請求項１）を要件とする。
【０００６】
請求項１のボールペン１は、スプリング３が非圧縮状態でペン先下向きのチップ本体２内に仮挿入された状態（即ち、非圧縮・仮挿入状態）において、密着巻部３３の前端がチップ本体２の後端に、当接し、引っ掛かったとしても、ロッド部３１の前端及びコイル部３２の前端がチップ本体２内面の内側段部２４ａに非接触である。したがって、スプリング３の非圧縮・仮挿入状態において、密着巻部３３の前端の外側段部３４がチップ本体２の後端に引っ掛かったとしても、スプリング３の自重または振動の付与等により、前記スプリング３の引っ掛かりを解除でき、スプリング３の挿入不良の発生を抑えることが可能となる。
【０００８】
尚、本発明の「スプリング３の少なくともロッド部３１の前端から密着巻部３３の前端の外側段部３４までがチップ本体２内に挿入配置される」構成は、例えば、スプリング３の取付完了状態において、密着巻部３３の全体がチップ本体２内に挿入配置される構成、または、密着巻部３３の前端部がチップ本体２内に挿入配置されると同時に密着巻部３３の後端部がチップ本体２の後端から突出する構成が挙げられる。
【０００９】
本発明の「密着巻部３３」とは、コイル部３２の線材間が密着した部分をいう。本発明の「チップ本体２」とは、前端部にボール２１を回転可能に抱持する筒体であり、その材質は金属または合成樹脂のいずれであってもよい。また、本発明の「チップ本体２」は、図１のような単一の部材により構成してもよいし、複数の部材による構成（例えば、金属製の筒体の後端部に合成樹脂の筒体を取り付けた二部材による構成）でもよい。また、本発明の「チップ本体２」は、少なくとも、前方付勢されたボール２１と密接する内向きの前端縁部２２を備えればよく、前端縁部２２の後方にボール受け座を備えてもよいし、ボール受け座を備えなくてもよい。前記ボール受け座を備える場合、ボール２１の後方への移動が規制され、被筆記面（紙面）とボール２１との接触状態が維持でき、円滑な筆記が可能となる。
【００１０】
〔２〕前記請求項１のボールペン１において、チップ本体２の後端部に取り付けるホルダー４に、密着巻部３３の後端が係止される係止部４２を設け、前記ホルダー４の係止部４２によって密着巻部３３の後端を前方に押圧し、スプリング３を圧縮状態にさせること（請求項２）が好ましい。
【００１１】
前記請求項２のボールペン１により、ホルダー４をチップ本体２の後端部に取り付ける過程で、密着巻部３３の後端が係止部４２により前方に押圧され、スプリング３が圧縮・取付状態にされる。そのため、ホルダー４の取付工程とスプリング３の圧縮・取付工程とを同時に行うことができ、ボールペン１の組立工程を短縮できる。
【００１２】
〔３〕さらに、本発明は、内向きの前端縁部２２により前端部にボール２１を回転可能に抱持するチップ本体２と、前記ボール２１を前方に押圧し且つ前記ボール２１を前端縁部２２の内面に密接させるスプリング３とを備え、前記チップ本体２が、内面に複数の内側段部２４ａを備え、前記スプリング３が、ボール２１の後面に前端が当接されるロッド部３１と、該ロッド部３１の後端に連設されるコイル部３２と、該コイル部３２の後端部に形成される、前方のコイル部３２外径より大径の密着巻部３３と、該密着巻部３３の前端に形成される外側段部３４とを備え、前記チップ本体２の後端開口部から前記スプリング３を非圧縮状態で仮挿入し、その後、前記スプリング３を前方に押圧して圧縮状態にさせ、前記スプリング３の少なくともロッド部３１の前端から密着巻部３３の前端の外側段部３４までがチップ本体２内に挿入配置されるタイプのボールペンの製造方法であって、前記スプリング３を非圧縮状態でペン先下向きのチップ本体２内に仮挿入した際に、前記密着巻部３３の前端の外側段部３４が前記チップ本体２の後端に当接し、引っ掛かったとき、前記ロッド部３１の前端及び前記コイル部３２の前端が、前記チップ本体２内面の内側段部２４ａに非接触であり、前記ロッド部３１の前端が内側段部２４ａ以外のチップ本体２内面に当接し、前記コイル部３２の前端がチップ本体２内面に非接触である構成、または、前記コイル部３２の前端が内側段部２４ａ以外のチップ本体２内面に当接し、前記ロッド部３１の前端がチップ本体２内面に非接触である構成であること（請求項３）を要件とする。
【００１３】
請求項３のボールペンの製造方法は、請求項１同様、スプリング３が非圧縮状態でペン先下向きのチップ本体２内に仮挿入された状態（即ち、非圧縮・仮挿入状態）において、密着巻部３３の前端がチップ本体２の後端に当接し、引っ掛かったとしても、ロッド部３１の前端及びコイル部３２の前端がチップ本体２内面の内側段部２４ａに非接触である。したがって、スプリング３の非圧縮・仮挿入状態において、密着巻部３３の前端の外側段部３４がチップ本体２の後端に引っ掛かったとしても、スプリング３の自重または振動の付与等により、前記スプリング３の引っ掛かりを解除でき、スプリング３の挿入不良の発生を抑えることが可能となる。
【００１４】
〔４〕前記請求項３のボールペンの製造方法において、チップ本体２の後端部に取り付けるホルダー４が、密着巻部３３の後端が係止される係止部４２を備え、前記ホルダー４にチップ本体２を取り付ける過程において、前記ホルダー４の係止部４２によって前記密着巻部３３の後端を前方に押圧し、スプリング３を圧縮状態にさせてなること（請求項４）が好ましい。
【００１５】
前記請求項４のボールペンの製造方法により、ホルダー４をチップ本体２の後端部に取り付ける過程で、密着巻部３３の後端が係止部４２により前方に押圧され、スプリング３が圧縮・取付状態にされる。そのため、ホルダー４の取付工程とスプリング３の圧縮・取付工程とを同時に行うことができ、ボールペン１の組立工程を短縮できる。
【００１６】
【発明の実施の形態】
本発明の実施の形態を図面に従って説明する。
【００１７】
本発明の実施例を図１及び図２に示す。本実施例のボールペン１は、チップ本体２と、該チップ本体２の後端部外面が圧入固着されるホルダー４と、該ホルダー４の後端部外面が圧入固着されるインキ収容管５と、該チップ本体２内に収容されるスプリング３とからなる。
【００１８】
前記チップ本体２は、前端部にボール２１（例えば、外径０．５ｍｍ）を回転可能に抱持した金属製（例えばステンレス鋼製）の筒体よりなる。前記チップ本体２の内部には、切削加工により、前端部にボール抱持孔とボール受け座２３が形成され、その後方にインキ流通孔２４が形成される。また、前記チップ本体２の前端には、カシメ変形により内向きの前端縁部２２が形成される。前記前端縁部２２とボール受け座２３により、ボール抱持孔内においてボール２１が回転可能且つ前後移動可能に抱持される。また、ボール受け座２３の後方のインキ流通孔２４の内面には複数の階段状の内側段部２４ａが形成される。前記内側段部２４ａは、前方に向かうに従って小さい内径となる傾斜面であり、前記内側段部２４ａを除くインキ流通孔２４の内面には、前後方向に真っ直ぐなストレート部２４ｂが形成される。
【００１９】
前記ホルダー４は、合成樹脂（例えは、ポリプロピレン、ポリアセタール等）射出成形より得られる筒体である。前記ホルダーは、チップ本体２が取り付けられる先細状の前部と、該前部より後方に連設され且つインキ収容管５の前端に当接する鍔部と、該鍔部より後方に連設され且つインキ収容管５の前端開口部に圧入固着される後部とからなる。前記ホルダー４の内部には、チップ本体２の後端部が圧入固着される取付孔４１と、該取付孔４１の後方の内面に径方向に突設され且つスプリング３の後端が係止される係止部４２と、該係止部４２の後方に形成され且つ該取付孔４１に連通するインキ流通孔４３とが形成される。
【００２０】
本実施例では、チップ本体２の後部の外面には，ホルダー４の取付孔４１より大きい外径を有する肩部２５が形成される。前記肩部２５がホルダー４の前端に当接されると同時に、前記肩部２５より小さい外径を有するチップ本体２の後端部が、前記取付孔４１内に圧入固着される。このとき、前記チップ本体２の後端とホルダー４の係止部４２とは非接触状態が維持され、それにより、前記肩部２５とホルダー４の前端との確実な当接が可能となる。
【００２１】
前記インキ収容管５は、両端が開口された円筒体であり、合成樹脂の押出成形により得られる。前記インキ収容管５の前端開口部には、チップ本体２を備えたホルダー４の後部が圧入固着される。前記インキ収容管５の内部には、インキ（例えは、剪断減粘性が付与された水性ゲルインキ、または２０℃の粘度が１０００ｍＰａ・ｓ〜１００００ｍＰａ・ｓの中粘度の油性インキ）と、該インキの後端に配置され且つ該インキの消費に伴って前進するグリス状の追従体とが充填される。
【００２２】
前記スプリング３は、線径０．１２ｍｍ〜０．１４ｍｍのステンレス鋼製線材よりなり、前部のロッド部３１と、後部のコイル部３２とが一体に連設される。前記コイル部３２の後端部には、前方のコイル部３２の外径よりも大きい外径を有する円筒状の密着巻部３３が形成される。また、前記密着巻部３３の前端には、環状の外側段部３４が形成される。本実施例では、前記外側段部３４は、スプリング３の軸線に対して垂直面であるが、これ以外に、前方に向かうに従って次第に小径となる傾斜面であってもよい。前記傾斜面からなる外側段部３４によって、チップ本体２後端と密着巻部３３の前端の外側段部３４とが引っ掛かったとしても、より一層、容易に前記引っ掛かり状態を解除することができる。
【００２３】
前記密着巻部３３の外径は、チップ本体２の後端開口部の内径より小さく設定される。具体的には、前記チップ本体２の後端開口部の内径は、１．４ｍｍに設定され、前記密着巻部３３の外径は１．２ｍｍに設定され、前記密着巻部３３の前方のコイル部３２の外径は１．０ｍｍに設定される。また、前記スプリング３の取付状態の荷重は、２０グラム〜３０グラムに設定される。
【００２４】
次に本実施例のスプリング３の取付工程を順に説明する。
【００２５】
〔１〕スプリングの非圧縮・仮挿入状態（図１参照）
チップ本体２のペン先側を下向きにし、チップ本体２の後端開口部を上向きにし、前記チップ本体２の後端開口部に、非圧縮状態のスプリング３をロッド部３１を下側にし、落下により挿入させる。このとき、図１に示すように、密着巻部３３の前端の外側段部３４とチップ本体２の後端とが、軸方向に当接し、引っ掛かったとしても、コイル部３２の前端が、チップ本体２のインキ流通孔２４内面のストレート部２４ｂに径方向に当接し、ロッド部３１の前端が、インキ流通孔２４の内面と非接触である。即ち、密着巻部３３の前端の外側段部３４とチップ本体２の後端とが、軸方向に当接し、引っ掛かったとき、ロッド部３１の前端及びコイル部３２の前端がインキ流通孔２４の内側段部２４ａと非接触状態にある。
【００２６】
そのため、スプリング３の自重やスプリング３に振動を付与することにより、容易にその引っ掛かり状態を解除することができる。前記引っ掛かり状態を解除することにより、スプリング３のロッド部３１の前端をボール２１の後面に当接させた状態にでき、スプリング３の密着巻部３３の前端の外側段部３４をチップ本体２内に位置させ、密着巻部３３の後端部をチップ本体２の後端より後方に突出させる。
【００２７】
〔２〕スプリング圧縮・取付工程
次に、スプリング３の密着巻部の後端を前方に押圧することにより、スプリング３を非圧縮・仮挿入状態から圧縮状態にする。このとき、密着巻部３３の外面がチップ本体２の後端開口部の内面にガイドされ、密着巻部３３がチップ本体２の後端開口部内に円滑に挿入される。前記密着巻部３３は、コイル部３２の非密着巻部（弾発作用部）に比べて、曲げ変形しがたいため、スプリング３を前方に押圧して取り付ける際のスプリング３後端部の曲がりの発生が抑えられる。本実施例では、密着巻部３３の後端は、ホルダー４（具体的にはホルダー４の係止部４２）により前方に押圧され、スプリング３の圧縮・取付工程と同時に、ホルダー４の取付工程（即ち、チップ本体２の後端部をホルダー４の取付孔４１に圧入固着する工程）がなされ、組立工程の簡略化が可能となる。
【００２８】
〔３〕スプリングの圧縮・取付状態（図２参照）
前記圧縮・取付工程の後、前記スプリング３は、圧縮・取付が完了した状態となる。このとき、前記スプリング３の密着巻部３３の後端が、ホルダー４内面の係止部４２に係止されると共に、前記スプリング３のロッド部３１の前端により、ボール２１後面が前方に押圧され、それにより、ボール２１前面と前端縁部２２内面とが環状に密接される。
【００２９】
本実施例のボールペン１は、非筆記時、前記ボール２１と前記前端縁部２２の内面との密接により、ペン先がシールされる。それにより、ペン先を下向き状態で保管したとしても、ペン先からのインキ漏出が防止され、また、ペン先を上向き状態で保管したとしても、ペン先からの空気混入が防止される。また、筆記時、被筆記面によりボール２１が後方に移動され、ボール２１と前端縁部２２の隙間からインキが吐出される。
【００３０】
尚、本発明の密着巻部３３の後端を支持する「係止部４２」は、本実施例のような、係止部４２がチップ本体２の外部後方に位置するタイプであってもよいし、これ以外にも、係止部４２がチップ本体２内に配置される構成であってもよい。さらに、「係止部４２」は、チップ本体２の側壁を内方へ押圧変形することによりチップ本体２の内壁面に一体に形成する構成、または、チップ本体２内に圧入する別部材による構成でもよい。
【００３１】
本発明の「ホルダー４」は、インキ収容管５を兼ねる構成（即ちホルダー４及びインキ収容管５を一部材により構成するもの）であってもよい。また、ホルダー４にチップ本体２の後端部を取り付ける構成は、チップ本体２の後端部の外面と、ホルダー４内面（即ち取付孔４１内面）とが固着される構成（図２）の他、チップ本体２の後端部の内面（即ちインキ流通孔２４内面）と、ホルダー４の後端部の外面とが固着される構成（図示せず）でもよい。
【００３２】
【発明の効果】
請求項１により、スプリング仮挿入の際、スプリングの密着巻部の前端がチップ本体の後端に引っ掛かったとしても、スプリングの自重や振動等により容易にその引っ掛かりを解除でき、スプリングの挿入不良の発生を抑えることが可能となる。
【００３３】
請求項２により、ホルダーの取付工程とスプリングの圧縮・取付工程とを同時に行うことができ、ボールペンの組立工程を短縮できる。
【００３４】
請求項３により、スプリング仮挿入の際、スプリングの密着巻部の前端がチップ本体の後端に引っ掛かったとしても、スプリングの自重や振動等により容易にその引っ掛かりを解除でき、スプリングの挿入不良の発生を抑えることが可能となる。
【００３５】
請求項４により、ホルダーの取付工程とスプリングの圧縮・取付工程とを同時に行うことができ、ボールペンの組立工程を短縮できる。
【図面の簡単な説明】
【図１】本発明の一実施例のスプリングの非圧縮・仮挿入状態を示す縦断面図である。
【図２】図１のスプリングの圧縮・取付状態を示す縦断面図である。
【符号の説明】
１ボールペン
２チップ本体
２１ボール
２２前端縁部
２３ボール受け座
２４インキ流通孔
２４ａ内側段部
２４ｂストレート部
２５肩部
３スプリング
３１ロッド部
３２コイル部
３３密着巻部
３４外側段部
４ホルダー
４１取付孔
４２係止部
４３インキ流通孔
５インキ収容管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ballpoint pen and a method for manufacturing the ballpoint pen. Specifically, a tip main body that rotatably holds the ball at the front end portion by an inward front end edge portion, and a spring that presses the ball forward and closely contacts the inner surface of the front end edge portion. The present invention relates to a ballpoint pen and a ballpoint pen manufacturing method. In the present invention, “front” refers to the pen tip side (that is, the ball side), and “rear” refers to the opposite side.
[0002]
[Prior art]
Conventionally, in this type of ballpoint pen, a spring is formed at a rod portion that presses the ball forward, a coil portion that is connected to the rear end of the rod portion, and a rear end portion of the coil portion. For example, Japanese Patent Application Laid-Open No. 2000-203187 discloses a configuration in which a contact winding portion having a diameter larger than the outer diameter of the portion is inserted and arranged in the chip body from the rod portion of the spring to the contact winding portion. .
[0003]
In the above-described type of ballpoint pen, when the spring is temporarily inserted into the tip body of the pen tip downward in an uncompressed state, the front end (that is, the outer step portion) of the tightly wound portion of the spring is hooked on the rear end of the tip body. The front end of the rod part or the front end of the coil part may be caught by an inner step formed on the inner surface of the chip body. In that case, even if vibration or the like is given in the temporary insertion process of the spring, the catch cannot be easily released, and there is a possibility that the spring is not inserted and arranged at an appropriate position in the chip body, resulting in poor insertion.
[0004]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and even when the spring is temporarily inserted, even if the front end of the tightly wound portion of the spring is caught on the rear end of the chip body, it is easy due to its own weight or vibration. It is an object of the present invention to provide a ballpoint pen that can release the hook and suppress the occurrence of poor spring insertion.
[0005]
[Means for Solving the Problems]
[1] In the present invention, the tip body 2 that rotatably holds the ball 21 at the front end portion by the inward front end edge portion 22, the ball 21 is pressed forward, and the ball 21 is pressed against the front end edge portion 22. The tip body 2 includes a plurality of inner step portions 24a on the inner surface, and the spring 3 has a rod portion 31 whose front end abuts against the rear surface of the ball 21, and the rod A coil part 32 connected to the rear end of the part 31, a tightly wound part 33 formed at the rear end part of the coil part 32 and having a diameter larger than the outer diameter of the front coil part 32, and the tightly wound part 33 A ball-point pen in which at least the front end of the rod portion 31 of the spring 3 to the outer step portion 34 of the front end of the tightly wound portion 33 is inserted and arranged in the chip body 2. 1, the spring When the temporarily inserted into the pen tip down the chip body 2 in an uncompressed state 3, outer stepped portion 34 of the front end of the contact winding portion 33 abuts against the rear end of the tip body 2, when caught, the The front end of the rod portion 31 and the front end of the coil portion 32 are set so as not to contact the inner step portion 24a of the inner surface of the chip body 2, and the front end of the rod portion 31 is placed on the inner surface of the chip body 2 other than the inner step portion 24a. The front end of the coil part 32 is in contact with the inner surface of the chip body 2 or the front end of the coil part 32 is in contact with the inner surface of the chip body 2 other than the inner stepped portion 24a. Is a structure that is not in contact with the inner surface of the chip body 2 (Claim 1).
[0006]
In the ballpoint pen 1 of the first aspect, when the spring 3 is temporarily inserted into the tip body 2 with the pen tip facing downward in an uncompressed state (that is, in a non-compressed / temporarily inserted state), the front end of the tightly wound portion 33 is the tip body. 2, the front end of the rod portion 31 and the front end of the coil portion 32 are not in contact with the inner step portion 24 a on the inner surface of the chip body 2. Therefore, even when the outer stepped portion 34 at the front end of the tightly wound portion 33 is caught by the rear end of the chip body 2 in the non-compressed / temporarily inserted state of the spring 3, 3 can be released, and the occurrence of poor insertion of the spring 3 can be suppressed.
[0008]
In addition, the configuration in which “at least the front end of the rod portion 31 of the spring 3 to the outer stepped portion 34 of the front end of the tightly wound portion 33 is inserted and arranged in the chip body 2” of the present invention is, for example, a state where the spring 3 is completely attached. In the configuration, the entire tightly wound part 33 is inserted and arranged in the chip body 2 or the front end of the tightly wound part 33 is inserted and arranged in the chip body 2 and the rear end part of the tightly wound part 33 is The structure which protrudes from the rear end of the chip | tip body 2 is mentioned.
[0009]
The “contact winding portion 33” of the present invention refers to a portion where the wire portions of the coil portion 32 are in close contact. The “chip body 2” of the present invention is a cylindrical body that rotatably holds the ball 21 at the front end, and the material thereof may be either metal or synthetic resin. In addition, the “chip body 2” of the present invention may be constituted by a single member as shown in FIG. 1 or may be constituted by a plurality of members (for example, a synthetic resin at the rear end of a metal cylinder). The structure by the two members which attached the cylinder may be sufficient. The “chip body 2” of the present invention only needs to have at least an inward front end edge 22 that is in close contact with the forward-biased ball 21, and a ball receiving seat behind the front end edge 22. Alternatively, the ball seat may not be provided. When the ball receiving seat is provided, the rearward movement of the ball 21 is restricted, the contact state between the writing surface (paper surface) and the ball 21 can be maintained, and smooth writing can be performed.
[0010]
[2] In the ballpoint pen 1 of claim 1, the holder 4 attached to the rear end portion of the chip body 2 is provided with a locking portion 42 for locking the rear end of the tightly wound portion 33 so that the holder 4 is locked. It is preferable that the rear end of the tightly wound portion 33 is pressed forward by the portion 42 and the spring 3 is compressed (Claim 2).
[0011]
In the process of attaching the holder 4 to the rear end portion of the chip body 2 by the ballpoint pen 1 of the second aspect, the rear end of the tightly wound portion 33 is pressed forward by the locking portion 42 and the spring 3 is in a compressed and attached state. Is done. Therefore, the attachment process of the holder 4 and the compression / attachment process of the spring 3 can be performed simultaneously, and the assembly process of the ballpoint pen 1 can be shortened.
[0012]
[3] Further, in the present invention, the tip body 2 that rotatably holds the ball 21 at the front end portion by the inward front end edge portion 22, the ball 21 is pressed forward, and the ball 21 is held at the front end edge portion. A spring 3 that is in close contact with the inner surface of 22, the tip body 2 includes a plurality of inner stepped portions 24 a on the inner surface, and the spring 3 has a rod portion 31 whose front end abuts against the rear surface of the ball 21; A coil portion 32 connected to the rear end of the rod portion 31; a tightly wound portion 33 formed at the rear end portion of the coil portion 32 having a diameter larger than the outer diameter of the front coil portion 32; An outer step portion 34 formed at the front end of the portion 33, the spring 3 is temporarily inserted in an uncompressed state from the rear end opening of the chip body 2, and then the spring 3 is pressed forward to be compressed. Let the state of the spring 3 A method of manufacturing a ballpoint pen in which a portion from the front end of the rod portion 31 to the outer stepped portion 34 at the front end of the tightly wound portion 33 is inserted into the chip body 2 and the spring 3 is uncompressed and the pen tip faces downward. When the outer stepped portion 34 at the front end of the tightly wound portion 33 comes into contact with the rear end of the tip main body 2 and is caught when temporarily inserted into the tip main body 2, the front end of the rod portion 31 and the coil portion 32 front end of the tip Ri contactless der to the inner stepped portion 24a of the main body 2 internal surface, in contact with the front end of the rod portion 31 within the tip body 2 internal surface other than the inner stepped portion 24a, the front end of the coil portion 32 The structure that is not in contact with the inner surface of the chip body 2 or the front end of the coil portion 32 abuts on the inner surface of the chip body 2 other than the inner stepped portion 24a, and the front end of the rod portion 31 is not in contact with the inner surface of the chip body 2. Constitution Oh and Rukoto the (claim 3) requirements.
[0013]
The ballpoint pen manufacturing method according to the third aspect is the same as in the first aspect, in the state where the spring 3 is temporarily inserted into the tip body 2 in the pen tip downward direction in an uncompressed state (that is, in an uncompressed / temporary insertion state). Even if the front end of the portion 33 comes into contact with the rear end of the chip body 2 and is caught, the front end of the rod portion 31 and the front end of the coil portion 32 are not in contact with the inner step portion 24 a on the inner surface of the chip body 2. Therefore, even when the outer stepped portion 34 at the front end of the tightly wound portion 33 is caught by the rear end of the chip body 2 in the non-compressed / temporarily inserted state of the spring 3, 3 can be released, and the occurrence of poor insertion of the spring 3 can be suppressed.
[0014]
[4] In the method for manufacturing a ballpoint pen according to claim 3, the holder 4 attached to the rear end portion of the chip body 2 includes a locking portion 42 with which the rear end of the tightly wound portion 33 is locked. In the process of attaching the chip body 2, it is preferable that the back end of the tightly wound portion 33 is pressed forward by the engaging portion 42 of the holder 4 and the spring 3 is compressed (Claim 4).
[0015]
In the process of attaching the holder 4 to the rear end portion of the chip body 2 by the ballpoint pen manufacturing method according to the fourth aspect, the rear end of the tightly wound portion 33 is pressed forward by the locking portion 42 and the spring 3 is compressed and attached. Put into a state. Therefore, the attachment process of the holder 4 and the compression / attachment process of the spring 3 can be performed simultaneously, and the assembly process of the ballpoint pen 1 can be shortened.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0017]
An embodiment of the present invention is shown in FIGS. The ballpoint pen 1 of the present embodiment includes a chip body 2, a holder 4 to which the outer surface of the rear end portion of the chip body 2 is press-fitted and fixed, an ink storage tube 5 to which the outer surface of the rear end portion of the holder 4 is press-fitted and fixed, The spring 3 is accommodated in the chip body 2.
[0018]
The chip body 2 is made of a metal (for example, stainless steel) cylinder having a ball 21 (for example, an outer diameter of 0.5 mm) rotatably held at the front end. Inside the chip body 2, a ball holding hole and a ball receiving seat 23 are formed at the front end portion by cutting, and an ink circulation hole 24 is formed behind the hole. Further, an inward front end edge portion 22 is formed at the front end of the chip body 2 by caulking deformation. The front end edge portion 22 and the ball receiving seat 23 hold the ball 21 in the ball holding hole so as to be rotatable and movable back and forth. Further, a plurality of step-like inner step portions 24 a are formed on the inner surface of the ink circulation hole 24 behind the ball receiving seat 23. The inner stepped portion 24a is an inclined surface having an inner diameter that decreases toward the front, and a straight portion 24b that is straight in the front-rear direction is formed on the inner surface of the ink circulation hole 24 except for the inner stepped portion 24a.
[0019]
The holder 4 is a cylinder obtained by injection molding of a synthetic resin (for example, polypropylene, polyacetal, etc.). The holder includes a tapered front portion to which the chip body 2 is attached, a collar portion that is provided behind the front portion and that contacts the front end of the ink containing tube 5, and a rear portion that is provided behind the collar portion; And a rear portion that is press-fitted and fixed to the front end opening of the ink containing tube 5. Inside the holder 4, a mounting hole 41 into which the rear end portion of the chip body 2 is press-fitted and fixed, and a rear surface of the mounting hole 41 project radially and the rear end of the spring 3 is locked. And an ink circulation hole 43 formed at the rear of the locking portion 42 and communicating with the mounting hole 41.
[0020]
In the present embodiment, a shoulder portion 25 having an outer diameter larger than the mounting hole 41 of the holder 4 is formed on the outer surface of the rear portion of the chip body 2. At the same time as the shoulder portion 25 is brought into contact with the front end of the holder 4, the rear end portion of the chip body 2 having an outer diameter smaller than that of the shoulder portion 25 is press-fitted and fixed in the mounting hole 41. At this time, the rear end of the chip body 2 and the locking portion 42 of the holder 4 are maintained in a non-contact state, whereby the shoulder portion 25 and the front end of the holder 4 can be reliably brought into contact with each other.
[0021]
The ink containing tube 5 is a cylindrical body having both ends opened, and is obtained by extrusion molding of a synthetic resin. The rear portion of the holder 4 having the chip body 2 is press-fitted and fixed to the front end opening of the ink storage tube 5. Inside the ink storage tube 5 is ink (for example, a water-based gel ink imparted with shear thinning, or a medium viscosity oil-based ink having a viscosity at 20 ° C. of 1000 mPa · s to 10000 mPa · s) and the ink. A grease-like follower disposed at the rear end and moving forward as the ink is consumed is filled.
[0022]
The spring 3 is made of a stainless steel wire having a wire diameter of 0.12 mm to 0.14 mm, and a front rod portion 31 and a rear coil portion 32 are integrally connected. A cylindrical close wound portion 33 having an outer diameter larger than the outer diameter of the front coil portion 32 is formed at the rear end portion of the coil portion 32. Further, an annular outer step 34 is formed at the front end of the tightly wound portion 33. In the present embodiment, the outer step portion 34 is a surface perpendicular to the axis of the spring 3, but may be an inclined surface that gradually becomes smaller in diameter toward the front. Even if the outer stepped portion 34 made of the inclined surface catches the rear end of the chip body 2 and the outer stepped portion 34 at the front end of the tightly wound portion 33, the hooked state can be released more easily.
[0023]
The outer diameter of the tightly wound portion 33 is set smaller than the inner diameter of the rear end opening of the chip body 2. Specifically, the inner diameter of the rear end opening of the chip body 2 is set to 1.4 mm, the outer diameter of the contact winding portion 33 is set to 1.2 mm, and the coil in front of the contact winding portion 33 is set. The outer diameter of the part 32 is set to 1.0 mm. Moreover, the load of the attached state of the spring 3 is set to 20 grams to 30 grams.
[0024]
Next, the attachment process of the spring 3 of a present Example is demonstrated in order.
[0025]
[1] Non-compressed / temporarily inserted spring (see Fig. 1)
The tip 2 of the tip body 2 faces downward, the rear end opening of the tip body 2 faces upward, the uncompressed spring 3 faces down on the rear end opening of the tip body 2 and drops. To insert. At this time, as shown in FIG. 1, even if the outer step 34 at the front end of the tightly wound portion 33 and the rear end of the chip body 2 are in contact with each other in the axial direction, The straight portion 24 b on the inner surface of the ink circulation hole 24 of the main body 2 is in radial contact with the front end of the rod portion 31 and is not in contact with the inner surface of the ink circulation hole 24. That is, when the outer step 34 at the front end of the tightly wound portion 33 and the rear end of the chip body 2 are in contact with each other in the axial direction, the front end of the rod portion 31 and the front end of the coil portion 32 are connected to the ink circulation hole 24. It is in a non-contact state with the inner stepped portion 24a.
[0026]
Therefore, the hooked state can be easily released by applying vibration to the own weight of the spring 3 or the spring 3. By releasing the hooked state, the front end of the rod portion 31 of the spring 3 can be brought into contact with the rear surface of the ball 21, and the outer stepped portion 34 at the front end of the tightly wound portion 33 of the spring 3 can be placed inside the chip body 2. The rear end portion of the tightly wound portion 33 is protruded rearward from the rear end of the chip body 2.
[0027]
[2] Spring Compression / Attachment Step Next, the rear end of the tightly wound portion of the spring 3 is pressed forward to bring the spring 3 into a compressed state from an uncompressed / temporary insertion state. At this time, the outer surface of the tightly wound portion 33 is guided by the inner surface of the rear end opening of the chip body 2, and the tightly wound portion 33 is smoothly inserted into the rear end opening of the chip body 2. Since the tightly wound portion 33 is less likely to bend and deform than the non-closely wound portion ( elasticity acting portion) of the coil portion 32, the bending of the rear end portion of the spring 3 when the spring 3 is attached by pressing forward. Occurrence is suppressed. In the present embodiment, the rear end of the tightly wound portion 33 is pressed forward by the holder 4 (specifically, the locking portion 42 of the holder 4), and simultaneously with the compression / attachment step of the spring 3, the attachment step of the holder 4 is performed. (In other words, a step of press-fitting and fixing the rear end portion of the chip body 2 to the mounting hole 41 of the holder 4) is performed, and the assembly process can be simplified.
[0028]
[3] Compression and mounting state of the spring (see Fig. 2)
After the compression / attachment step, the spring 3 is in a state where the compression / attachment is completed. At this time, the rear end of the tightly wound portion 33 of the spring 3 is locked to the locking portion 42 on the inner surface of the holder 4, and the rear surface of the ball 21 is pressed forward by the front end of the rod portion 31 of the spring 3. As a result, the front surface of the ball 21 and the inner surface of the front end edge 22 are brought into close contact with each other in an annular shape.
[0029]
In the ballpoint pen 1 of this embodiment, the pen tip is sealed by close contact between the ball 21 and the inner surface of the front end edge 22 when not writing. Thereby, even if the pen tip is stored in a downward state, ink leakage from the pen tip is prevented, and even if the pen tip is stored in an upward state, air entry from the pen tip is prevented. At the time of writing, the ball 21 is moved rearward by the writing surface, and ink is ejected from the gap between the ball 21 and the front end edge portion 22.
[0030]
The “locking portion 42” for supporting the rear end of the tightly wound portion 33 of the present invention may be of a type in which the locking portion 42 is located outside the chip body 2 as in this embodiment. In addition to this, the engaging portion 42 may be arranged in the chip body 2. Further, the “locking portion 42” is configured to be integrally formed on the inner wall surface of the chip body 2 by pressing and deforming the side wall of the chip body 2 inward, or configured by a separate member that is press-fitted into the chip body 2. But you can.
[0031]
The “holder 4” of the present invention may be configured to also serve as the ink storage tube 5 (that is, the holder 4 and the ink storage tube 5 are configured by one member). The configuration in which the rear end portion of the chip body 2 is attached to the holder 4 is a configuration in which the outer surface of the rear end portion of the chip body 2 and the inner surface of the holder 4 (that is, the inner surface of the mounting hole 41) are fixed (FIG. 2). The inner surface (that is, the inner surface of the ink circulation hole 24) of the rear end portion of the chip body 2 and the outer surface of the rear end portion of the holder 4 may be fixed (not shown).
[0032]
【The invention's effect】
According to claim 1, even when the front end of the tightly wound portion of the spring is caught on the rear end of the tip body during temporary insertion of the spring, the catch can be easily released due to the spring's own weight, vibration, etc. Occurrence can be suppressed.
[0033]
According to the second aspect, the holder attaching process and the spring compressing / attaching process can be performed simultaneously, and the ballpoint pen assembling process can be shortened.
[0034]
According to claim 3, even if the front end of the tightly wound portion of the spring is caught on the rear end of the tip body during temporary insertion of the spring, the catch can be easily released due to the spring's own weight, vibration, etc. Occurrence can be suppressed.
[0035]
According to the fourth aspect of the present invention, the holder attaching process and the spring compressing / attaching process can be performed simultaneously, and the ballpoint pen assembling process can be shortened.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an uncompressed / temporary insertion state of a spring according to an embodiment of the present invention.
2 is a longitudinal sectional view showing a compression / attachment state of the spring of FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Chip body 21 Ball 22 Front end edge part 23 Ball receiving seat 24 Ink distribution hole 24a Inner step part 24b Straight part 25 Shoulder part 3 Spring 31 Rod part 32 Coil part 33 Adhesion winding part 34 Outer step part 4 Holder 41 Mounting hole 42 Locking portion 43 Ink flow hole 5 Ink storage tube

Claims

A tip body that rotatably holds the ball at the front end by an inward front edge, and a spring that presses the ball forward and closely contacts the inner surface of the front edge. A rod portion whose front end is in contact with the rear surface of the ball, a coil portion connected to the rear end of the rod portion, and a rear end of the coil portion. A tightly wound portion having a diameter larger than the outer diameter of the front coil portion and an outer step portion formed at the front end of the tightly wound portion, the tightly wound portion from at least the front end of the rod portion of the spring. Is a ballpoint pen that is inserted and arranged in the chip body up to the outer step of the front end
When the spring is temporarily inserted into the tip body of the pen tip downward in an uncompressed state, the outer step portion of the front end of the tightly wound portion comes into contact with the rear end of the tip body and is caught .
The front end of the rod portion and the front end of the coil portion are set so as not to contact the inner step portion of the inner surface of the chip body , and the front end of the rod portion contacts the inner surface of the chip body other than the inner step portion, and the coil portion The front end of the coil portion is not in contact with the inner surface of the chip body, or the front end of the coil portion is in contact with the inner surface of the chip body other than the inner stepped portion, and the front end of the rod portion is not in contact with the inner surface of the chip body. A ballpoint pen.

The holder attached to the rear end portion of the chip body is provided with a locking portion for locking the rear end of the tightly wound portion, and the rear end of the tightly wound portion is pressed forward by the retaining portion of the holder, and the spring The ball-point pen according to claim 1, which is compressed.

A tip body that rotatably holds the ball at the front end by an inward front edge, and a spring that presses the ball forward and closely contacts the inner surface of the front edge. A rod portion whose front end is in contact with the rear surface of the ball, a coil portion connected to the rear end of the rod portion, and a rear end of the coil portion. A tightly wound portion having a larger diameter than the outer diameter of the front coil portion, and an outer step portion formed at the front end of the tightly wound portion, and the spring from the rear end opening of the chip body. Temporary insertion is performed in an uncompressed state, and then the spring is pressed forward to be in a compressed state. At least the front end of the rod portion of the spring to the outer step portion of the front end of the tightly wound portion is inserted and arranged in the chip body. Type of ballpoint pen There is provided a method,
When the spring is temporarily inserted into the tip body of the pen tip downward in an uncompressed state, the outer step portion of the front end of the tightly wound portion comes into contact with the rear end of the tip body and is caught .
Front and the front end of the coil portion of the rod portion, the tip Ri contactless der to the inner stepped portion of the body inner surface, in contact with the front end of the rod portion to the chip body inner surface other than the inner stepped portion, of the coil portion configuration front end is not in contact with the chip body inner surface, or front end of the coil portion is in contact with the chip body inner surface other than the inner stepped portion, the front end of the rod portion is Ru configuration der is not in contact with the chip body inner surface A method for manufacturing a ballpoint pen.

The holder attached to the rear end portion of the chip body includes a locking portion for locking the rear end of the tightly wound portion, and in the process of attaching the chip body to the holder, the tightly wound portion is secured by the retaining portion of the holder. The ballpoint pen manufacturing method according to claim 3, wherein the rear end of the portion is pressed forward to make the spring in a compressed state.