JP2009034878A - Duplex writing utensil - Google Patents

Duplex writing utensil Download PDF

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JP2009034878A
JP2009034878A JP2007200471A JP2007200471A JP2009034878A JP 2009034878 A JP2009034878 A JP 2009034878A JP 2007200471 A JP2007200471 A JP 2007200471A JP 2007200471 A JP2007200471 A JP 2007200471A JP 2009034878 A JP2009034878 A JP 2009034878A
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tip
reduced diameter
diameter portion
writing
diametrically
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Kazuhiko Furukawa
和彦 古川
Hiroyuki Muto
広行 武藤
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Mitsubishi Pencil Co Ltd
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Mitsubishi Pencil Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent even the soiled thing such as ink dropping or the like stuck at a writing tip from coming into contact with the inner wall of the tip of a barrel, as a matter of course, the writing tip from coming into contact with the inner wall of the tip of the barrel at the delivery of the writing tip in a duplex writing utensil including a ballpoint pen as a writing body. <P>SOLUTION: At the tip side of a taper part 34 formed taperingly at the tip portion of the holder 31 of a ballpoint pen tip 30, the first diametrically contracting part 36 of a taper surface, which contracts diametrically so as to form a ridge line boundary against the taper part 34, the second diametrically contracting part 37, which is a taper surface contracting diametrically so as to form a valley line boundary against the first diametrically contracting part 36, the third diametrically contracting part 38, which is a taper surface contracting diametrically so as to form a ridge line boundary against he second diametrically contracting part 37 and the fourth diametrically contracting part 39, which is a taper surface contracting diametrically so as to form a valley line boundary against the third diametrically contacting part 38 are provided under the condition that a caulking part 35 for holding the writing ball 40 is formed by inwardly plasticaly deforming the tip of the fourth diametrically contracting part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、複数の筆記先端を有し、特にそのうちの少なくとも１つがボールペンである複式筆記具に関する。   The present invention relates to a compound writing instrument having a plurality of writing tips, particularly at least one of which is a ballpoint pen.

従来、１つの軸筒内に複数の筆記体を備えた複式筆記具と称されるものが提供されてきている。この複式筆記具としては、いわゆる「多色ボールペン」のように、複数色のボールペンリフィルが搭載されているものが知られている。また、ボールペンのみならず、筆記体としてシャープペンシルも含むものも提供されている。
このような複式筆記具の一般的な構造としては、以下のとおりである。すなわち、軸筒後端付近の外周に、筆記体の数と同数のスライドボタンが用意されている。筆記時には、所望の色あるいは筆記体に対応するスライドボタンを先端方向へ移動させると、それに対応した筆記先端が軸筒先端から突出し、スライドボタンの係止により筆記体は固定され、筆記が可能となる。このような複式筆記具では、筆記体は筆記具の軸心の周囲にほぼ等配された状態となっているが、先端方向への移動に伴い、軸筒先端内壁の傾斜に当接して、軸心に徐々に寄っていき、先端から繰り出されるに至る。したがって、繰り出しの際に、筆記先端が軸筒先端内壁に付着することがある。これにより、軸筒を透明な材質で形成していたりする場合には、軸筒先端内壁がインクで汚れ、見栄えが悪くなる。 2. Description of the Related Art Conventionally, a so-called double writing instrument having a plurality of writing bodies in one shaft cylinder has been provided. As this compound writing instrument, a so-called “multicolored ballpoint pen” is known which is equipped with a multicolored ballpoint pen refill. Further, not only ballpoint pens but also those including mechanical pencils as cursive materials are provided.
The general structure of such a compound writing instrument is as follows. That is, as many slide buttons as the number of cursive letters are prepared on the outer periphery near the rear end of the shaft cylinder. At the time of writing, if the slide button corresponding to the desired color or writing style is moved in the tip direction, the writing tip corresponding to it protrudes from the tip of the shaft cylinder, and the writing style is fixed by the locking of the slide button, and writing is possible Become. In such a dual-type writing instrument, the writing bodies are almost evenly arranged around the axis of the writing instrument. Gradually approached and led out from the tip. Accordingly, the writing tip may adhere to the inner wall of the tip of the barrel during feeding. As a result, when the shaft tube is formed of a transparent material, the inner wall of the tip of the shaft tube is stained with ink, and the appearance is deteriorated.

この問題点を解決しようと試みているのが下記の特許文献１記載の発明である。同発明では、軸筒先端内壁の傾きを筆記体先端付近のいわゆるテーパー部の傾きより小さくすることで、筆記先端が軸筒先端内壁に触れないようにしようとするものである。
なお、筆記先端をテーパー部の傾きの延長線の内側へ位置させようとする試みとして、下記の特許文献２記載の発明のように、テーパー部の先端側を内向きに凸となるように切削して、その部分の断面形状が略Ｌ字形となるように縮径したものが開示されている。
特開２００３−４８３９７号公報（図１、図５） 特開平９−３１５０７５号公報（図１） The invention described in Patent Document 1 below attempts to solve this problem. In the present invention, the inclination of the inner wall of the tip of the shaft cylinder is made smaller than the inclination of the so-called tapered portion near the tip of the writing body so that the writing tip does not touch the inner wall of the tip of the shaft cylinder.
In addition, as an attempt to position the writing tip to the inside of the extension line of the inclination of the tapered portion, cutting is performed so that the tip side of the tapered portion is convex inward as in the invention described in Patent Document 2 below. And what reduced the diameter so that the cross-sectional shape of the part may become a substantially L shape is disclosed.
JP 2003-48397 A (FIGS. 1 and 5) Japanese Patent Laid-Open No. 9-315075 (FIG. 1)

ボールペンの筆記先端にはインクボテ等の汚れが付着することがある。上記従来技術では筆記先端の、特にカシメ部より先端を軸筒先端内壁に付着させないようにすることを試みている。しかし、インクボテはカシメ部の外側に付着するため、筆記先端が軸筒先端内壁に接触しない場合でもインクボテが接触することは想定される。この場合は、軸筒先端内壁の汚れは免れない。
上記の問題点を解決すべく、本発明は、筆記体としてボールペンを含む複式筆記具において、筆記先端の繰り出しの際に、軸筒先端内壁に筆記先端が接触しないのはもちろん、筆記先端にインクボテ等の汚れが付着していてもこれが軸筒先端内壁に接触しないようにすることを課題とする。 The writing tip of the ballpoint pen may be soiled with ink bottling or the like. In the above-mentioned prior art, an attempt is made to prevent the tip of the writing tip, in particular, the tip from adhering to the inner wall of the tip of the shaft tube. However, since the ink stick adheres to the outside of the caulking portion, it is assumed that the ink stick contacts even when the writing tip does not contact the inner wall of the shaft tip. In this case, dirt on the inner wall of the tip of the shaft cylinder is inevitable.
In order to solve the above-mentioned problems, the present invention is a dual-type writing instrument including a ballpoint pen as a writing body. It is an object of the present invention to prevent this from coming into contact with the inner wall at the tip end of the shaft cylinder even if dirt is attached.

上記の課題に鑑み、本発明は、少なくとも１のボールペンリフィル10を搭載した複式筆記具60であって、
前記ボールペンリフィル10の先端に装着されているボールペンチップ30は、筆記ボール40と、該筆記ボール40を抱持するホルダー31とで構成され、
前記ホルダー31の先端部分には、
先細に形成されたテーパー部34と、
前記テーパー部34の先端側で該テーパー部34との境界が山線をなすように縮径するテーパー面である第１縮径部36と、
前記第１縮径部36の先端側で該第１縮径部36との境界が谷線をなすように縮径するテーパー面である第２縮径部37と、
前記第２縮径部37の先端側で該第２縮径部37との境界が山線をなすように縮径するテーパー面である第３縮径部38と、
前記第３縮径部38の先端側で該第３縮径部38との境界が谷線をなすように縮径するテーパー面である第４縮径部39と、
前記第４縮径部39の先端を内向きに塑性変形させて前記筆記ボール40を抱持するカシメ部35と
が形成されていることを特徴とする。 In view of the above problems, the present invention is a dual writing instrument 60 equipped with at least one ballpoint pen refill 10,
The ballpoint pen tip 30 attached to the tip of the ballpoint pen refill 10 is composed of a writing ball 40 and a holder 31 for holding the writing ball 40,
At the tip of the holder 31,
Tapered tapered portion 34,
A first reduced diameter portion 36, which is a tapered surface that is reduced in diameter so that a boundary between the tapered portion 34 and the tapered portion 34 forms a mountain line on the tip side of the tapered portion 34;
A second reduced diameter portion 37 that is a tapered surface that is reduced in diameter so that the boundary with the first reduced diameter portion 36 forms a valley line on the distal end side of the first reduced diameter portion 36;
A third reduced diameter portion 38, which is a tapered surface that is reduced in diameter so that the boundary with the second reduced diameter portion 37 forms a mountain line on the distal end side of the second reduced diameter portion 37;
A fourth reduced diameter portion 39, which is a tapered surface that is reduced in diameter so that the boundary with the third reduced diameter portion 38 forms a valley line on the distal end side of the third reduced diameter portion 38;
A caulking portion 35 that holds the writing ball 40 by plastically deforming the tip of the fourth reduced diameter portion 39 inward is formed.

上記ホルダー31は、たとえば、以下のようにして形成される。
たとえば、ステンレス鋼製の円柱材の先端を、先細に略円錐状に切削してテーパー部34を形成する。次いで、後端側からインクの流路となるバック孔を穿孔し、一方先端側から異筆記ボールが収納されるボールハウスを切削し、そしてこれらを連結するインク孔を貫通させる。
そして、テーパー部34の先端側を、内側に凸となるように切削することで、第１縮径部36と第２縮径部37とが同時に形成される。ここで、テーパー部34に対し、この第１縮径部36は内向きに縮径したテーパー面となり、テーパー部34との境界は山線をなす。換言すると、テーパー部34と第１縮径部36とは、外側に凸な略Ｌ字形乃至略Ｖ字形をなすこととなる。一方、第１縮径部36と第２縮径部37との境界は谷線をなす。換言すると、第１縮径部36と第２縮径部37とは、内側に凸な略Ｌ字形乃至略Ｖ字形をなすこととなる。 The holder 31 is formed as follows, for example.
For example, the tapered portion 34 is formed by cutting the tip of a stainless steel columnar material into a substantially conical shape. Next, a back hole serving as an ink flow path is drilled from the rear end side, and a ball house in which the writing ball is stored is cut from the front end side, and the ink hole connecting them is penetrated.
Then, the first reduced diameter portion 36 and the second reduced diameter portion 37 are simultaneously formed by cutting the tip end side of the tapered portion 34 so as to be convex inward. Here, with respect to the tapered portion 34, the first reduced diameter portion 36 is a tapered surface that is reduced inwardly, and the boundary with the tapered portion 34 forms a mountain line. In other words, the tapered portion 34 and the first reduced diameter portion 36 have a substantially L shape or a substantially V shape that protrudes outward. On the other hand, the boundary between the first reduced diameter portion 36 and the second reduced diameter portion 37 forms a valley line. In other words, the first reduced diameter portion 36 and the second reduced diameter portion 37 are formed in a substantially L shape or a substantially V shape that protrudes inward.

さらに、第２縮径部37の先端側を、内側に凸となるように切削することで、第３縮径部38と第４縮径部39とが同時に形成される。第２縮径部37に対し、第３縮径部38は内向きに縮径したテーパー面となり、第２縮径部37との境界は山線をなす。換言すると、第２縮径部37と第３縮径部38とは、外側に凸な略Ｌ字形乃至略Ｖ字形をなすこととなる。一方、第３縮径部38と第４縮径部39との境界は谷線をなす。換言すると、第３縮径部38と第４縮径部39とは、内側に凸な略Ｌ字形乃至略Ｖ字形をなすこととなる。
そして、ボールハウスに、たとえば超硬合金製の筆記ボール40を挿入した後、第４縮径部39の先端を内向きに塑性変形させてカシメ部35を形成する。これにより、筆記ボール40が落下しないように抱持されることとなる。 Further, the third reduced diameter portion 38 and the fourth reduced diameter portion 39 are simultaneously formed by cutting the distal end side of the second reduced diameter portion 37 so as to be convex inward. With respect to the second reduced diameter portion 37, the third reduced diameter portion 38 has a tapered surface that is reduced inwardly, and the boundary with the second reduced diameter portion 37 forms a mountain line. In other words, the second reduced diameter portion 37 and the third reduced diameter portion 38 form a substantially L shape or a substantially V shape that protrudes outward. On the other hand, the boundary between the third reduced diameter portion 38 and the fourth reduced diameter portion 39 forms a valley line. In other words, the third reduced diameter portion 38 and the fourth reduced diameter portion 39 form a substantially L shape or a substantially V shape that is convex inward.
Then, after inserting a writing ball 40 made of, for example, cemented carbide into the ball house, the tip of the fourth reduced diameter portion 39 is plastically deformed inward to form the crimped portion 35. Thereby, the writing ball 40 is held so as not to fall.

このように、内側に凸となるようなテーパー面の組合せを２段階に設けることで、カシメ部35がテーパー部34の延長線上より十分内側に位置することとなる。
なお、前記複式筆記具60の軸筒先端内壁72の軸心に対するテーパー角は、前記テーパー部34のテーパー角と略等しいことが望ましい。こうすることで、軸筒先端内壁72にはテーパー部34のみが接触し、カシメ部35や筆記ボール40は接触しないこととなる。
また、前記軸筒先端内壁７２に前記テーパー部34が接触している際の、該軸筒先端内壁72と前記カシメ部34との距離は０．１５ｍｍ以上０．４ｍｍ以下であることが望ましい。ここで、カシメ部34に付着するインクボテの大きさは通常０．１５ｍｍ未満であり、０．１５ｍｍ以上のインクボテは筆記時に描線のボテとして付着する。よって、この距離の下限値が０．１５ｍｍであれば軸筒先端内壁72にインクボテが付着することはない。しかし、この距離が０．４ｍｍを超えると、筆記時に筆記ボール40がテーパー部34に隠れてしまうために筆記が困難になる。よって、この距離は０．４ｍｍ以下であることが望ましい。 In this way, by providing the combination of the tapered surfaces that are convex inward in two stages, the caulking portion 35 is positioned sufficiently on the inner side of the extension line of the tapered portion 34.
It is desirable that the taper angle with respect to the axial center of the inner end 72 of the cylindrical tube of the double writing instrument 60 is substantially equal to the taper angle of the tapered portion 34. By doing so, only the tapered portion 34 is in contact with the inner end wall 72 of the shaft tube, and the crimping portion 35 and the writing ball 40 are not in contact.
Further, when the tapered portion 34 is in contact with the inner end wall 72 of the shaft tube, the distance between the inner wall 72 of the shaft tube and the caulking portion 34 is preferably 0.15 mm or more and 0.4 mm or less. Here, the size of the ink bot that adheres to the caulking portion 34 is usually less than 0.15 mm, and an ink bottom of 0.15 mm or more adheres as a stroke of a drawn line when writing. Therefore, if the lower limit value of this distance is 0.15 mm, the ink stub does not adhere to the inner wall 72 of the shaft tube tip. However, if this distance exceeds 0.4 mm, the writing ball 40 is hidden by the tapered portion 34 during writing, and writing becomes difficult. Therefore, this distance is desirably 0.4 mm or less.

上記の構成により、内側に凸となるような２段階の縮径部により、テーパー部の延長線上よりカシメ部が十分内側に位置することとなる。よって、テーパー部が軸筒先端内壁に接した際に、カシメ部が軸筒先端内壁から十分な距離を保つこととなる。それにより、筆記先端はもとより、インクボテ等の汚れが付着していても軸筒先端内壁に接触することはなく、軸筒先端内壁の汚れが防止できることとなっている。   With the above-described configuration, the crimped portion is positioned sufficiently inside the extension line of the tapered portion by the two-stage reduced diameter portion that is convex inward. Therefore, when the taper portion is in contact with the inner wall of the tip end of the shaft tube, the caulking portion is kept at a sufficient distance from the inner wall of the tip end of the shaft tube. As a result, not only the writing tip but also dirt such as ink bottling adheres to the inner wall of the tip of the shaft tube, and the inner wall of the tip of the shaft tube can be prevented from being stained.

本発明の１の実施の形態を、図面を参照しつつ説明する。
図１は、本発明の１の実施の形態に係る複式筆記具60を側面断面図で示したものである。
軸筒70内には複数本のボールペンリフィル10が収納されている。そのうちの１本が、スライドボタン75の移動により軸筒先端71より突出している。なお、筆記先端の軸筒先端71からの出没の機構については本件では割愛する。
各ボールペンリフィル10は、図２に正面図（Ａ）及び正面断面図（Ｂ）で示すように、インク収容管15の先端に継手20を介してボールペンチップ30が装着されて形成されている。インク収容管15は、ポリプロピレン製の管として形成されている。継手20はポリブチレンテレフタレート樹脂製で、後半部分がインク収容管15の先端に圧入されている。継手20の内部空間は弁室21となっており、その中にはインクの逆流防止目的でステンレス鋼製の球体である弁体22が遊嵌されている。 An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing a dual writing instrument 60 according to one embodiment of the present invention.
A plurality of ballpoint pen refills 10 are accommodated in the shaft cylinder 70. One of them protrudes from the tip 71 of the barrel by the movement of the slide button 75. It should be noted that the mechanism of the intrusion from the tip 71 of the writing tube is omitted in this case.
Each ball-point pen refill 10 is formed by attaching a ball-point pen tip 30 to the tip of the ink storage tube 15 via a joint 20, as shown in a front view (A) and a front sectional view (B) in FIG. The ink storage tube 15 is formed as a polypropylene tube. The joint 20 is made of polybutylene terephthalate resin, and the latter half is press-fitted into the tip of the ink containing tube 15. An internal space of the joint 20 is a valve chamber 21 in which a valve body 22 which is a stainless steel sphere is loosely fitted for the purpose of preventing the backflow of ink.

ボールペンチップ30は、図３に正面図で示すように、ステンレス鋼製の円柱材を切削加工して形成されたホルダー31と、その先端に抱持される超硬合金製の球体である筆記ボール40とで構成されている。ホルダー31は、継手20先端に圧入される小径のチップ連結部32と、大径のチップ露出部33とに分けられる。チップ露出部33の先端側は、先細に略円錐状に切削されたテーパー部34となっている。さらに、テーパー部34の先端部分には、テーパー部との境界が山線をなすように縮径するテーパー面である第１縮径部36、この第１縮径部36との境界が谷線をなすように縮径するテーパー面である第２縮径部37、この第２縮径部37との境界が山線をなすように縮径するテーパー面である第３縮径部38、及び、この第３縮径部38との境界が谷線をなすように縮径するテーパー面である第４縮径部39が先端方向へ向かって順に形成されている。さらにこの第４縮径部39を内向きに塑性変形させて筆記ボール40を抱持するカシメ部35がホルダー31の最先端に形成されている。一方、ボールペンチップ30の内部空間には、図２に示すように、インクの先端からの流出防止を目的とするスプリング50が挿入されている。   As shown in the front view of FIG. 3, the ball-point pen tip 30 includes a holder 31 formed by cutting a stainless steel cylindrical material and a writing ball that is a sphere made of cemented carbide held at the tip of the holder 31. It consists of 40 and. The holder 31 is divided into a small-diameter tip connecting portion 32 that is press-fitted into the tip of the joint 20 and a large-diameter tip exposing portion 33. The tip end side of the chip exposed portion 33 is a tapered portion 34 that is tapered and cut into a substantially conical shape. Further, at the tip portion of the tapered portion 34, a first reduced diameter portion 36 which is a tapered surface whose diameter is reduced so that the boundary with the tapered portion forms a mountain line, and the boundary with the first reduced diameter portion 36 is a valley line. A second reduced diameter portion 37 that is a tapered surface that is reduced in diameter so as to form a third reduced diameter portion 38 that is a tapered surface that is reduced in diameter so that a boundary with the second reduced diameter portion 37 forms a mountain line; A fourth reduced diameter portion 39, which is a tapered surface whose diameter is reduced so that the boundary with the third reduced diameter portion 38 forms a valley line, is formed in order toward the distal end. Further, a caulking portion 35 that holds the writing ball 40 by plastically deforming the fourth reduced diameter portion 39 inward is formed at the forefront of the holder 31. On the other hand, as shown in FIG. 2, a spring 50 is inserted into the internal space of the ballpoint pen tip 30 to prevent the ink from flowing out from the tip.

ボールペンリフィル10が軸筒先端71から突出する際には、図４の一部正面断面図に示すように、ボールペンチップ30のテーパー部34が、軸筒先端内壁72と接触して摺動しつつ先端方向へ移動する。この接触の状態を拡大した図５に示すように、テーパー部34のテーパー角と、軸筒先端内壁72の傾斜角とが一致しいる。また、テーパー部34の先端側に形成された第１縮径部36、第２縮径部37、第３縮径部38及び第４縮径部39により、カシメ部35が軸筒先端内壁72より距離ｄだけ離れた位置を保っている。この距離ｄは、０．１５ｍｍ以上０．４ｍｍ以下であることが望ましい。この距離ｄにより、カシメ部35にインクボテが付着していても軸筒先端内壁72に接触して汚すことがないこととなっている。   When the ballpoint pen refill 10 protrudes from the shaft tube tip 71, the tapered portion 34 of the ballpoint pen tip 30 slides in contact with the shaft tube tip inner wall 72 as shown in a partial front sectional view of FIG. Move toward the tip. As shown in FIG. 5 in which this contact state is enlarged, the taper angle of the taper portion 34 and the inclination angle of the inner end wall 72 of the shaft tube coincide with each other. Further, the caulking portion 35 is formed by the first reduced diameter portion 36, the second reduced diameter portion 37, the third reduced diameter portion 38, and the fourth reduced diameter portion 39 formed on the distal end side of the tapered portion 34. The position further away by the distance d is maintained. This distance d is preferably 0.15 mm or more and 0.4 mm or less. Due to this distance d, even if ink squirts are attached to the caulking portion 35, they do not come into contact with the inner wall 72 at the tip of the shaft tube and become dirty.

本発明は、複数の筆記先端を有する複式筆記具に利用可能である。   The present invention can be used for a compound writing instrument having a plurality of writing tips.

本発明の１の実施の形態に係る複式筆記具を側面断面図でそれぞれ示したものである。The compound writing instrument which concerns on 1 embodiment of this invention is each shown by side sectional drawing. 本発明の１の実施の形態で使用されるボールペンリフィルを、正面図（Ａ）及び正面断面図（Ｂ）で示したものである。The ball-point pen refill used in one embodiment of the present invention is shown in a front view (A) and a front sectional view (B). 本発明の１の実施の形態で使用されるボールペンチップを正面図で示したものである。The ball-point pen tip used by one embodiment of the present invention is shown with the front view. 本発明の１の実施の形態に係る複式筆記具の軸筒先端付近を一部正面断面図で示したものである。FIG. 2 is a partial front cross-sectional view of the vicinity of the tip of a shaft cylinder of a dual-type writing instrument according to one embodiment of the present invention. 図４においてテーパー部と軸筒先端内壁との接触部分を拡大した一部正面断面図である。FIG. 5 is a partial front sectional view in which a contact portion between the tapered portion and the inner end of the shaft cylinder is enlarged in FIG. 4.

符号の説明Explanation of symbols

10 ボールペンリフィル 15 インク収容管
20 継手 21 弁室 22 弁体
30 ボールペンチップ 31 ホルダー 32 チップ連結部
33 チップ露出部 34 テーパー部 35 カシメ部
36 第１縮径部 37 第２縮径部 38 第３縮径部
39 第４縮径部
40 筆記ボール 50 スプリング
60 複式筆記具 70 軸筒 71 軸筒先端
72 軸筒先端内壁 75 スライドボタン 10 Ball pen refill 15 Ink tube
20 Fitting 21 Valve chamber 22 Disc
30 Ballpoint pen tip 31 Holder 32 Tip joint
33 Chip exposed part 34 Taper part 35 Caulking part
36 1st reduced diameter part 37 2nd reduced diameter part 38 3rd reduced diameter part
39 4th reduced diameter part
40 writing balls 50 springs
60 Compound writing instrument 70 Shaft cylinder 71 Shaft cylinder tip
72 Shaft cylinder inner wall 75 Slide button

Claims (3)

少なくとも１のボールペンリフィルを搭載した複式筆記具であって、
前記ボールペンリフィルの先端に装着されているボールペンチップは、筆記ボールと、該筆記ボールを抱持するホルダーとで構成され、
前記ホルダーの先端部分には、
先細に形成されたテーパー部と、
前記テーパー部の先端側で該テーパー部との境界が山線をなすように縮径するテーパー面である第１縮径部と、
前記第１縮径部の先端側で該第１縮径部との境界が谷線をなすように縮径するテーパー面である第２縮径部と、
前記第２縮径部の先端側で該第２縮径部との境界が山線をなすように縮径するテーパー面である第３縮径部と、
前記第３縮径部の先端側で該第３縮径部との境界が谷線をなすように縮径するテーパー面である第４縮径部と、
前記第４縮径部の先端を内向きに塑性変形させて前記筆記ボールを抱持するカシメ部と
が形成されていることを特徴とする複式筆記具。 A dual writing instrument equipped with at least one ballpoint pen refill,
The ballpoint pen tip attached to the tip of the ballpoint pen refill is composed of a writing ball and a holder for holding the writing ball,
At the tip of the holder,
A tapered portion formed in a taper;
A first reduced-diameter portion that is a tapered surface that is reduced in diameter so that a boundary between the tapered portion and the tapered portion forms a mountain line on the distal end side of the tapered portion;
A second reduced diameter portion that is a tapered surface that is reduced in diameter so that a boundary with the first reduced diameter portion forms a valley line on a distal end side of the first reduced diameter portion;
A third reduced diameter portion that is a tapered surface that is reduced in diameter so that a boundary with the second reduced diameter portion forms a mountain line on a distal end side of the second reduced diameter portion;
A fourth reduced diameter portion that is a tapered surface that is reduced in diameter so that a boundary with the third reduced diameter portion forms a valley line on a distal end side of the third reduced diameter portion;
A compound writing instrument, wherein a crimping portion for holding the writing ball by plastically deforming a tip of the fourth reduced diameter portion inward is formed. 前記複式筆記具の軸筒先端内壁の軸心に対するテーパー角は、前記テーパー部のテーパー角と略等しいことを特徴とする請求項１記載の複式筆記具。   2. The compound writing instrument according to claim 1, wherein a taper angle of the compound writing instrument with respect to an axial center of the inner wall of the tip end of the shaft cylinder is substantially equal to a taper angle of the tapered portion. 前記軸筒先端内壁に前記テーパー部が接触している際の、該軸筒先端内壁と前記カシメ部との距離は０．１５ｍｍ以上０．４ｍｍ以下であることを特徴とする請求項２記載の複式筆記具。   The distance between the inner tube tip inner wall and the caulking portion when the tapered portion is in contact with the inner tube tip inner wall is 0.15 mm or more and 0.4 mm or less. Double writing instrument.
JP2007200471A 2007-08-01 2007-08-01 Duplex writing utensil Withdrawn JP2009034878A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011093098A (en) * 2009-10-27 2011-05-12 Pilot Corporation Ball-point pen chip
JP2014198439A (en) * 2013-03-29 2014-10-23 ゼブラ株式会社 Retractable writing instrument
JP2020090039A (en) * 2018-12-06 2020-06-11 ゼブラ株式会社 Retractable writing instrument

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011093098A (en) * 2009-10-27 2011-05-12 Pilot Corporation Ball-point pen chip
JP2014198439A (en) * 2013-03-29 2014-10-23 ゼブラ株式会社 Retractable writing instrument
JP2020090039A (en) * 2018-12-06 2020-06-11 ゼブラ株式会社 Retractable writing instrument
JP7165571B2 (en) 2018-12-06 2022-11-04 ゼブラ株式会社 haunting writing instrument

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