JP4426025B2

JP4426025B2 - Writing instrument

Info

Publication number: JP4426025B2
Application number: JP25402699A
Authority: JP
Inventors: 伸雄関根; 幹也井戸
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 1999-09-08
Filing date: 1999-09-08
Publication date: 2010-03-03
Anticipated expiration: 2019-09-08
Also published as: JP2001071674A

Description

【０００１】
【発明の属する技術分野】
本発明は、筆記具に関する。詳細には、軸筒の前部外周面に弾性材料よりなる筒状のグリップを取り付けた筆記具に関する。尚、本発明で「前」とはペン先側を指し、「後」とは外装体側を指す。
【０００２】
【従来の技術】
従来、軸筒外面にグリップを取り付けた筆記具として、例えば、（ａ）ペン先外周面を圧接支持する先細形状の先部材を軸筒先端に螺合により着脱自在に設け、前記先部材と、その後方の軸筒外周面に設けた段部との間に、弾性材料よりなる筒状のグリップを取り付けたもの、又は、（ｂ）軸筒の前部外周面に環状の取付凹部を設け、その取付凹部に前記グリップを乗り越え嵌合（又は落とし込み嵌合）させるもの等が知られている。
【０００３】
しかし、前記（ａ）のタイプの筆記具のグリップ取付構造は、先部材が螺合により軸筒に取り付けられているため、先部材が筆記使用によって緩み、グリップが、回転したり、あるいは前後にがたついたりするおそれがある。また、前記（ｂ）のタイプの筆記具のグリップ取付構造は、グリップ取付時の乗り越え嵌合の際、グリップの径方向外方への弾性変形（拡開変形）を利用するため、円滑なグリップの装着性を維持するには、グリップを、あまり肉厚なものにすることができず、その結果、所望するソフトなグリップの握り感が得られないおそれがある。
【０００４】
また、従来、軸筒内に、直接インキを収容するインキタンクと、該インキタンクの内圧変動による溢出インキを一時的に保持するインキ保留部材とを設けた筆記具（いわゆる直液式筆記具）において、軸筒後部のインキタンクの外周面を筒状の外装体で覆う構成も知られている。
【０００５】
ところが、前記従来の直液式筆記具は、筆記使用時、軸筒前部（即ちインキ保留部材の外周面）を直接把持するため、手の体温が軸筒後部（即ちインキタンクの外周面）に伝わり、それがインキタンク内の空気を膨張させることにより、インキタンクの内圧を上昇させ、その結果、インキ保留部材では吸収できない余剰のインキがペン先側より漏出するおそれがある。
【０００６】
【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、グリップの回転や前後のがたつきを回避し、かつ、円滑なグリップ装着性を維持すると同時にグリップの肉厚を自由に設定可能なものにし、さらに、直液式筆記具の場合には、手の体温が軸筒に伝わることを抑え、インキ漏出を十分に回避できる筆記具を提供しようとするものである。
【０００７】
【課題を解決するための手段】
〔１〕本発明は、軸筒２の前部外周面に弾性材料よりなる筒状のグリップ６を取り付けた筆記具であって、前記グリップ６を取り付ける軸筒２の前部外周面の前側に、前記グリップ６の前端部と当接する鍔部３を一体に形成し、前記軸筒２の後部外周面に、前記グリップ６の後端部と当接する筒状の外装体７を押し込み嵌合によって装着させ、前記鍔部３と前記外装体７との間で前記グリップ６を前後方向に挟持固定してなり、前記外装体７が装着される軸筒２の後部外周面の外径を、前記グリップ６が装着される軸筒２の前部外周面の外径よりも小さく設定し、前記軸筒２内の後部に直接インキを収容するインキタンク２１を設けると共に、前記軸筒内２の前部に前記インキタンク２１の内圧変化に応じた溢出インキを一時的に保持するインキ保留部材９を設け、前記外装体７が、前記インキタンク２１の位置する軸筒２の外周面に装着されると共に、前記グリップ６が、前記インキ保留部材９の位置する軸筒２の外周面に装着され、グリップ６及び外装体７により軸筒２外周面が連続して覆われてなること（請求項１）を要件とする。
【０００８】
（作用）
それにより、従来のような筆記使用によって緩みがちな先部材を使用することがなく、グリップ６が装着される軸筒２の前部４外周面の前側に一体に形成された鍔部３と、軸筒２の後部５外周面に装着する別体の外装体７とにより、弾性材料よりなるグリップ６が、前後方向に僅かに圧縮変形されて挟持固定がなされる。それにより、筆記使用時のグリップ６の回転や前後のがたつきが十分に抑止される。
【０００９】
また、グリップ６を軸筒２に装着する際、従来のようにグリップ６を径方向外方に大きく拡開変形させる必要がなく、軸筒２にスムーズに装着できるため、グリップ６の肉厚を所望する肉厚に自由に設定できる。したがって、グリップ６を十分に厚肉にしてソフトな握り感を得ることもできる。
【００１０】
【００１１】
（作用）
前記外装体７が装着される軸筒２の後部５（小径部）外周面の外径を、前記グリップ６が装着される軸筒２の前部４（大径部）外周面の外径よりも小さく設定したことにより、グリップ６を軸筒２の後方から装着する際、グリップ６内周面が軸筒２の後部５（小径部）外周面に引っ掛かることがなく、軸筒２の前部４（大径部）外周面にグリップ６をスムーズに装着できる。
【００１２】
【００１３】
（作用）
前記軸筒２内の後部に直接インキを収容するインキタンク２１を設けると共に、前記軸筒２内の前部に前記インキタンク２１の内圧変化に応じた溢出インキを一時的に保持するインキ保留部材９を設けることにより、前記外装体７が、前記インキタンク２１の位置する軸筒２の外周面に装着されると共に、前記グリップ６が、前記インキ保留部材９の位置する軸筒２の外周面に装着される。即ち、グリップ６及び外装体７により軸筒２外周面が連続して覆われており、その上、筆記使用時、軸筒２の外周面を直接把持することなく、主に、弾性材料よりなるグリップ６を把持するため、手の体温が軸筒２の前部４から軸筒２の後部５に伝わりにくい。それにより、インキタンク２１内の圧力を上昇させてインキ漏出を生じさせることを、より一層回避できる。
【００１４】
【００１５】
【発明の実施の形態】
本発明の実施の形態について図面に従って説明する。
【００１６】
図１及び図２に本発明の実施例を示す。
【００１７】
筆記具１は、主に、先端にペン先８を備える軸筒２と、該軸筒２の前部４（大径部）外周面に取り付けられる筒状のグリップ６と、該グリップ６の後方の軸筒２の後部５（小径部）外周面に取り付けられる外装体７とからなる。
【００１８】
図２に示すように、軸筒２内の前部にはインキ保留部材９が装着され、該インキ保留部材９の後方の軸筒２内にはインキを直接貯留するインキタンク２１が形成される。前記インキ保留部材９は、複数枚の円板状櫛歯９１を備え、前記櫛歯９１相互間に一時的インキ保留部が形成される。また、前記インキ保留部材９の先端には、前記ペン先８（ここではボールペンチップ）がペン先ホルダー８１を介して取り付けられる。
【００１９】
前記ペン先８は、金属製パイプ（例えばステンレス鋼製パイプ）の先端に内方変形によってボール受け座を形成するタイプのボールペンチップであり、前記パイプ内部には、第１のインキ誘導部材９２（具体的には合成樹脂製棒状体）が収容される。また、前記ペン先８が固着されるペン先ホルダー８１内には、前記第１のインキ誘導部材９２と接続する第２のインキ誘導部材９３（具体的には繊維束の樹脂加工体）が収容されている。さらに、前記インキ保留部材９の軸心には、先端が前記第２のインキ誘導部材９３と接続し且つ後端がインキタンク２１と接続する第３のインキ誘導部材９４（具体的には内部に軸方向のインキ導出路を有する合成樹脂の押出成形体）が挿着される。
【００２０】
前記軸筒２は、その外周面に、環状の鍔部３と、該鍔部３の後方の円筒状の大径部４と、該大径部４の後方に連設された円筒状の小径部５とが一体に形成された合成樹脂の射出成形体である。前記大径部４外面にはグリップ６が装着され、前記小径部５外面には外装体７が装着される。
【００２１】
前記大径部４の外径は、前記鍔部３の外径より小さく且つ小径部５の外径より大きい外径を備える。また、前記鍔部３の外径は、グリップ６が容易に鍔部３を乗り越えて前方に抜けないよう、グリップ６の内径より大きく設定される。尚、前記軸筒２（即ち、鍔部３、大径部４、及び小径部５）の外径とは、その最大径を意味し、例えば、小径部５は、その外周面に分散状突起５１，５２，５３を備えるため、その分散状突起５１，５２，５３の最大の外接円の直径をいう。
【００２２】
前記小径部５外面には、等間隔周状に配設された４個の分散状突起５１，５２，５３が、前後方向に３箇所に配設される。前記３箇所の分散状突起５１，５２，５３の中で、前方の２箇所の分散状突起５１，５２は、外装体７内面に形成された環状凸部７１及び環状突起７２と乗り越え嵌合し、最も後方の１箇所の分散状突起５３は、外装体７内面と圧接する。
【００２３】
前記外装体７は、前端が開口され、後端が閉塞された有底円筒体であり、合成樹脂の射出成形により形成される。前記外装体７の前部内面（即ち開口側内面）には、１箇所の環状凸部７１とその後方の２箇所の環状突起７２，７３が配設される。前記環状凸部７１及び前方の環状突起７２が、前記軸筒２の小径部５外面の前方の２箇所の分散状突起５１，５２と乗り越え嵌合し、後方の１箇所の環状突起７３の前面が、軸筒２の小径部５外面の３箇所のうち中央の分散状突起５２の後面と圧接する。
【００２４】
また、前記外装体７の後部内面（即ち底部内周面）には、複数本（ここでは８本）の軸方向に伸びるリブ７４が、周状に等間隔に配設される。前記リブ７４は、軸筒２の小径部５の後端部外周面を圧接支持し、外装体７の径方向のぐらつきを防止する。
【００２５】
また、前記外装体７の内面と前記軸筒２の小径部５外面との間には、隙間７５（即ち断熱空間）が形成される。それにより、より一層、手の体温が軸筒２の小径部５（即ちインキタンク２１）に伝わることを回避できる。
【００２６】
前記グリップ６は、内部に内孔が軸方向に貫通された前後対称の円筒体であり、弾性材料（例えば、スチレン系エラストマー、オレフィン系エラストマー等の熱可塑性エラストマーやシリコンゴム）の成形体からなる。また、グリップ６の外周面には、複数本の環状溝６１が設けられ、それにより、グリップ６を把持した際の滑り止め効果が増す。
【００２７】
前記グリップ６は、鍔部３及び外装体７の外径よりも大きい外径（比較的太径）を備え、鍔部３及び外装体７よりも外方に突出し、且つ、僅かに凸曲面状の外面を備えているため、筆記使用時の握りやすさが向上する。また、前記グリップ６は、比較的厚肉に形成されるため、ソフトな握り感が得られる。
【００２８】
また、前記グリップ６の内周面の内径は、軸筒２の大径部４の外径と同じに設定したり、あるいは軸筒２の大径部４の外径より僅かに小さく設定し、グリップ６内周面と軸筒２外周面とを僅かに圧接させる構造でもよい。
【００２９】
前記グリップ６は、軸筒２への組立時、軸筒２の大径部４の外周面に、軸筒２の後方から小径部５をスムーズに貫通して装着され、その後、外装体７が、押し込み嵌合により小径部５外周面に装着される。それにより、前記グリップ６は、鍔部３の後端部と外装体７の前端部とにより前後方向に圧縮挟持される。
【００３０】
【００３１】
【００３２】
【００３３】
〔その他〕
尚、本発明のペン先８としては、前記ボールペンチップ以外にも、合成樹脂の押出成形体よりなるプラスチックペン体、繊維の樹脂加工体よりなる繊維ペン体、合成樹脂の連続気孔体よりなるポーラスペン体、パイプペン体、毛筆ペン体等の公知のペン先が適用できる。
【００３４】
尚、本発明の鍔部３の形状は、環状の他にも，複数の分散状凸部であってもよい。
【００３５】
【００３６】
【発明の効果】
請求項１により、筆記使用によるグリップの回転や前後のがたつきを十分に回避でき、かつ、グリップの円滑な装着性を維持すると共に、グリップの肉厚が自由に設定可能となる。
【００３７】
請求項１により、グリップを軸筒の後方から装着する際、グリップ内周面が軸筒の後部外周面に引っ掛かることがなく、軸筒の前部外周面にグリップをスムーズに装着できる。
【００３８】
請求項１により、筆記使用時、軸筒の外周面を直接把持することがないため、手の体温が軸筒前部から軸筒後部に伝わりにくい。それにより、インキタンク内の圧力を上昇させてインキ漏出を生じさせることを、より一層回避できる。
【００３９】
請求項１により、外装体の緩み（即ちグリップの回転や前後のがたつき）がより一層防止されると共に、グリップの迅速かつ確実な装着が可能となる。
【図面の簡単な説明】
【図１】本発明の実施例を示す要部縦断面図である。
【図２】図１の内部構造を示す縦断面図である。
【符号の説明】
１筆記具
２軸筒
２１インキタンク
２２インキ
２３フォロワ
３鍔部
４大径部（軸筒の前部）
５小径部（軸筒の後部）
５１分散状突起
５２分散状突起
５３分散状突起
６グリップ
６１環状溝
７外装体
７１環状凸部
７２環状突起
７３環状突起
７４リブ
７５隙間
７６通気孔
８ペン先
８１ペン先ホルダー
９インキ保留部材
９１櫛歯
９２第１のインキ誘導部材
９３第２のインキ誘導部材
９４第３のインキ誘導部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument. More specifically, the present invention relates to a writing instrument in which a cylindrical grip made of an elastic material is attached to the front outer peripheral surface of a shaft cylinder. In the present invention, “front” refers to the pen tip side, and “rear” refers to the exterior body side.
[0002]
[Prior art]
Conventionally, as a writing instrument having a grip attached to the outer surface of the shaft cylinder, for example, (a) a tapered tip member that press-supports the outer peripheral surface of the pen tip is detachably provided by screwing to the tip of the shaft cylinder, A cylindrical grip made of an elastic material is attached to the stepped portion provided on the outer peripheral surface of the shaft tube, or (b) an annular mounting recess is provided on the front outer peripheral surface of the shaft tube, There are known ones that get over (or drop fit) the grip into the mounting recess.
[0003]
However, in the grip attachment structure of the writing instrument of the type (a), since the tip member is attached to the shaft tube by screwing, the tip member is loosened by writing, and the grip rotates or is moved back and forth. There is a risk of rattling. In addition, the grip mounting structure of the writing instrument of the type (b) uses the elastic deformation (expanding deformation) outward in the radial direction of the grip at the time of climbing and fitting at the time of grip mounting. In order to maintain the wearability, the grip cannot be made too thick, and as a result, the desired soft grip may not be obtained.
[0004]
Conventionally, in a writing instrument (so-called direct liquid writing instrument) provided with an ink tank that directly stores ink in an axial cylinder, and an ink retaining member that temporarily holds overflow ink due to fluctuations in the internal pressure of the ink tank, A configuration is also known in which the outer peripheral surface of the ink tank at the rear of the shaft cylinder is covered with a cylindrical outer casing.
[0005]
However, since the conventional direct liquid writing instrument directly grips the front part of the shaft cylinder (that is, the outer peripheral surface of the ink retaining member) during writing, the body temperature of the hand is at the rear part of the shaft cylinder (that is, the outer peripheral surface of the ink tank). As a result, the air in the ink tank expands to increase the internal pressure of the ink tank. As a result, excess ink that cannot be absorbed by the ink retaining member may leak out from the pen tip side.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and avoids rotation of the grip and back-and-forth shaking, and can maintain the smooth grip mounting property and can freely set the thickness of the grip. Furthermore, in the case of a direct liquid type writing instrument, it is intended to provide a writing instrument that can suppress the body temperature of the hand from being transmitted to the shaft cylinder and sufficiently avoid ink leakage.
[0007]
[Means for Solving the Problems]
[1] The present invention is a writing instrument in which a cylindrical grip 6 made of an elastic material is attached to the front outer peripheral surface of the shaft cylinder 2, and on the front side of the front outer peripheral surface of the shaft cylinder 2 to which the grip 6 is attached, A flange 3 that contacts the front end of the grip 6 is integrally formed, and a cylindrical outer body 7 that contacts the rear end of the grip 6 is fitted to the rear outer peripheral surface of the shaft cylinder 2 by pressing. is allowed, the outer diameter of the grip 6 Ri name and sandwiched and fixed in the longitudinal direction, a rear outer peripheral surface of the barrel 2 of the outer body 7 is mounted between the flange portion 3 and the outer body 7, the An ink tank 21 that is set to be smaller than the outer diameter of the front outer peripheral surface of the shaft cylinder 2 to which the grip 6 is attached and that directly accommodates ink is provided in the rear portion of the shaft cylinder 2. An ink that temporarily holds overflow ink in response to a change in the internal pressure of the ink tank 21 A retaining member 9 is provided, and the exterior body 7 is mounted on the outer peripheral surface of the shaft cylinder 2 where the ink tank 21 is located, and the grip 6 is disposed on the outer periphery of the shaft cylinder 2 where the ink retaining member 9 is located. is mounted on the surface, the barrel 2 the outer peripheral surface is a requirement Rukoto a covered continuously (claim 1) by the grip 6 and the outer body 7.
[0008]
(Function)
Thereby, without using a tip member that tends to be loosened by writing as in the prior art, the flange 3 integrally formed on the front side of the outer peripheral surface of the front portion 4 of the shaft cylinder 2 to which the grip 6 is attached, The grip 6 made of an elastic material is slightly compressed and deformed in the front-rear direction by the separate exterior body 7 attached to the outer peripheral surface of the rear portion 5 of the shaft tube 2 to be clamped and fixed. Thereby, the rotation of the grip 6 and the rattling of the front and rear during writing are sufficiently suppressed.
[0009]
Further, when the grip 6 is attached to the shaft cylinder 2, it is not necessary to greatly expand and deform the grip 6 radially outwardly as in the conventional case, and the grip 6 can be smoothly attached to the shaft cylinder 2, so that the thickness of the grip 6 is increased. The desired wall thickness can be set freely. Therefore, it is possible to obtain a soft grip feeling by making the grip 6 sufficiently thick.
[0010]
[0011]
(Function)
The outer diameter of the outer peripheral surface of the rear portion 5 (small diameter portion) of the shaft cylinder 2 to which the exterior body 7 is attached is set to be larger than the outer diameter of the outer peripheral surface of the front portion 4 (large diameter portion) of the shaft cylinder 2 to which the grip 6 is attached. Since the grip 6 is mounted from the rear side of the shaft tube 2, the inner peripheral surface of the grip 6 is not caught by the outer surface of the rear portion 5 (small diameter portion) of the shaft tube 2. 4 (large diameter part) The grip 6 can be smoothly mounted on the outer peripheral surface.
[0012]
[0013]
(Function)
An ink tank 21 for directly storing ink at the rear part in the shaft cylinder 2 and an ink retaining member for temporarily holding overflow ink corresponding to a change in the internal pressure of the ink tank 21 at the front part in the shaft cylinder 2 9 is attached to the outer peripheral surface of the shaft cylinder 2 where the ink tank 21 is located, and the grip 6 is attached to the outer peripheral surface of the shaft cylinder 2 where the ink retaining member 9 is located. It is attached to. That is, the outer peripheral surface of the shaft cylinder 2 is continuously covered by the grip 6 and the outer casing 7, and, in addition, when used in writing, the outer periphery of the shaft cylinder 2 is not directly gripped but is mainly made of an elastic material. Since the grip 6 is gripped, the body temperature of the hand is not easily transmitted from the front portion 4 of the shaft tube 2 to the rear portion 5 of the shaft tube 2. Thereby, it is possible to further avoid increasing the pressure in the ink tank 21 and causing ink leakage.
[0014]
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0016]
It shows the actual施例of the present invention in FIGS.
[0017]
The writing instrument 1 mainly includes a shaft cylinder 2 having a pen tip 8 at the tip, a cylindrical grip 6 attached to an outer peripheral surface of a front portion 4 (large diameter portion) of the shaft cylinder 2, and a rear side of the grip 6. The outer casing 7 is attached to the outer peripheral surface of the rear portion 5 (small diameter portion) of the shaft cylinder 2.
[0018]
As shown in FIG. 2, an ink retaining member 9 is attached to the front part of the shaft cylinder 2, and an ink tank 21 for directly storing ink is formed in the shaft cylinder 2 behind the ink retaining member 9. . The ink retaining member 9 includes a plurality of disk-like comb teeth 91, and a temporary ink retaining portion is formed between the comb teeth 91. The pen tip 8 (here, a ballpoint pen tip) is attached to the tip of the ink holding member 9 via a pen tip holder 81.
[0019]
The pen tip 8 is a ball-point pen tip of a type in which a ball receiving seat is formed by inward deformation at the tip of a metal pipe (for example, a stainless steel pipe), and a first ink guide member 92 ( Specifically, a synthetic resin rod-like body) is accommodated. Further, in the pen tip holder 81 to which the pen tip 8 is fixed, a second ink guide member 93 (specifically, a fiber bundle resin processed body) connected to the first ink guide member 92 is accommodated. Has been. Further, a third ink guiding member 94 (specifically, an inner end of the ink retaining member 9 has a leading end connected to the second ink guiding member 93 and a rear end connected to the ink tank 21). A synthetic resin extrudate having an ink outlet path in the axial direction is inserted.
[0020]
The shaft cylinder 2 has, on its outer peripheral surface, an annular flange 3, a cylindrical large-diameter portion 4 behind the flange 3, and a cylindrical small-diameter continuously connected to the rear of the large-diameter portion 4. This is a synthetic resin injection-molded body integrally formed with the portion 5. A grip 6 is attached to the outer surface of the large diameter portion 4, and an exterior body 7 is attached to the outer surface of the small diameter portion 5.
[0021]
The outer diameter of the large diameter portion 4 is smaller than the outer diameter of the flange portion 3 and larger than the outer diameter of the small diameter portion 5. Further, the outer diameter of the flange 3 is set larger than the inner diameter of the grip 6 so that the grip 6 can easily get over the flange 3 and not come forward. The outer diameter of the shaft cylinder 2 (that is, the flange portion 3, the large diameter portion 4, and the small diameter portion 5) means its maximum diameter. For example, the small diameter portion 5 has a dispersive protrusion on its outer peripheral surface. Since 51, 52, 53 are provided, the diameter of the maximum circumscribed circle of the dispersed protrusions 51, 52, 53 is said.
[0022]
On the outer surface of the small-diameter portion 5, four distributed protrusions 51, 52, 53 are arranged at three positions in the front-rear direction. Among the three dispersed projections 51, 52, 53, the two dispersed projections 51, 52 on the front are fitted over the annular projection 71 and the annular projection 72 formed on the inner surface of the exterior body 7. The farthest one dispersive projection 53 is in pressure contact with the inner surface of the outer package 7.
[0023]
The exterior body 7 is a bottomed cylindrical body whose front end is opened and whose rear end is closed, and is formed by injection molding of synthetic resin. On the inner surface of the front part of the outer package 7 (that is, the inner surface on the opening side), one annular convex portion 71 and two annular projections 72 and 73 on the rear side are disposed. The annular protrusion 71 and the forward annular protrusion 72 are fitted over the two dispersive protrusions 51 and 52 in front of the outer surface of the small diameter portion 5 of the shaft cylinder 2, and the front surface of the annular protrusion 73 in the rear is placed. However, it comes into pressure contact with the rear surface of the central dispersive projection 52 among the three locations on the outer surface of the small diameter portion 5 of the shaft tube 2.
[0024]
A plurality (eight in this case) of ribs 74 extending in the axial direction are arranged on the rear inner surface (that is, the inner peripheral surface of the bottom portion) of the exterior body 7 at equal intervals in a circumferential shape. The rib 74 supports the outer peripheral surface of the rear end portion of the small-diameter portion 5 of the shaft cylinder 2 by pressure contact and prevents the outer casing 7 from wobbling in the radial direction.
[0025]
Further, a gap 75 (that is, a heat insulating space) is formed between the inner surface of the exterior body 7 and the outer surface of the small diameter portion 5 of the shaft cylinder 2. Thereby, it is possible to further prevent the body temperature of the hand from being transmitted to the small diameter portion 5 (that is, the ink tank 21) of the shaft tube 2.
[0026]
The grip 6 is a longitudinally symmetrical cylindrical body having an inner hole penetrated in the axial direction, and is formed of a molded body of an elastic material (for example, a thermoplastic elastomer such as a styrene elastomer or an olefin elastomer or silicon rubber). . Further, a plurality of annular grooves 61 are provided on the outer peripheral surface of the grip 6, thereby increasing the anti-slip effect when the grip 6 is gripped.
[0027]
The grip 6 has an outer diameter (relatively large diameter) larger than the outer diameters of the flange 3 and the exterior body 7, protrudes outward from the flange 3 and the exterior body 7, and has a slightly convex curved shape. Since it has an outer surface, the ease of gripping when writing is improved. Further, since the grip 6 is formed to be relatively thick, a soft grip feeling can be obtained.
[0028]
Further, the inner diameter of the inner peripheral surface of the grip 6 is set to be the same as the outer diameter of the large diameter portion 4 of the shaft cylinder 2, or is set slightly smaller than the outer diameter of the large diameter portion 4 of the shaft cylinder 2, A structure in which the inner peripheral surface of the grip 6 and the outer peripheral surface of the shaft cylinder 2 are slightly pressed may be used.
[0029]
The grip 6 is attached to the outer peripheral surface of the large-diameter portion 4 of the shaft tube 2 through the small-diameter portion 5 smoothly from the rear of the shaft tube 2 during assembly to the shaft tube 2, and then the exterior body 7 is mounted. Then, it is mounted on the outer peripheral surface of the small diameter portion 5 by push fitting. Thereby, the grip 6 is compressed and sandwiched in the front-rear direction by the rear end portion of the flange portion 3 and the front end portion of the outer casing 7.
[0030]
[0031]
[0032]
[0033]
[Others]
In addition to the ballpoint pen tip, the nib 8 of the present invention includes a plastic pen body made of an extruded product of a synthetic resin, a fiber pen body made of a processed resin body of a fiber, and a porous body made of a continuous pore body of a synthetic resin. Known pen tips such as a pen body, a pipe pen body, and a brush pen body can be applied.
[0034]
In addition, the shape of the collar part 3 of this invention may be a some dispersion | distribution convex part other than cyclic | annular form.
[0035]
[0036]
【The invention's effect】
According to the first aspect, it is possible to sufficiently avoid the rotation of the grip and the back-and-forth of the grip due to the use of writing, maintain the smooth mounting property of the grip, and freely set the thickness of the grip.
[0037]
According to the first aspect, when the grip is mounted from the rear of the shaft tube, the grip inner peripheral surface is not caught on the rear outer peripheral surface of the shaft tube, and the grip can be smoothly mounted on the front outer peripheral surface of the shaft tube.
[0038]
According to the first aspect, since the outer peripheral surface of the shaft tube is not directly gripped during writing, the body temperature of the hand is hardly transmitted from the front portion of the shaft tube to the rear portion of the shaft tube. Thereby, it is possible to further avoid increasing the pressure in the ink tank and causing ink leakage.
[0039]
According to the first aspect , loosening of the exterior body (that is, rotation of the grip and rattling of the front and rear) is further prevented, and the grip can be quickly and reliably attached.
[Brief description of the drawings]
1 is an essential part longitudinal cross sectional view showing the actual施例of the present invention.
2 is a longitudinal sectional view showing the internal structure of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Shaft cylinder 21 Ink tank 22 Ink 23 Follower 3 collar part 4 Large diameter part (front part of a shaft cylinder)
5 Small diameter part (rear part of shaft tube)
51 Dispersion protrusion 52 Dispersion protrusion 53 Dispersion protrusion 6 Grip 61 Annular groove 7 Outer body 71 Annular projection 72 Annular protrusion 73 Annular protrusion 74 Rib 75 Clearance 76 Vent hole 8 Pen point 81 Pen point holder 9 Ink holding member 91 Comb Teeth 92 First ink guide member 93 Second ink guide member 94 Third ink guide member

Claims

A writing instrument in which a cylindrical grip made of an elastic material is attached to the front outer peripheral surface of the shaft cylinder, and a flange that comes into contact with the front end of the grip is provided on the front side of the front outer peripheral surface of the shaft cylinder to which the grip is attached. A cylindrical exterior body that is integrally formed and is fitted on the outer peripheral surface of the rear portion of the shaft cylinder by contact with the rear end portion of the grip by press fitting, and the grip is placed between the flange portion and the exterior body. Ri Na was sandwiched and fixed in the longitudinal direction, the outer diameter of the rear outer peripheral surface of the barrel of the outer body is mounted, is set smaller than the outer diameter of the front outer peripheral surface of the barrel in which the grip is mounted, An ink tank that directly stores ink at the rear part in the shaft cylinder is provided, and an ink holding member that temporarily holds overflow ink corresponding to a change in the internal pressure of the ink tank is provided at the front part in the shaft cylinder, The exterior body is located in the ink tank While being mounted on the outer peripheral surface of the cylinder, the grip, the is mounted on the outer peripheral surface of the barrel to the position of the ink holding member, the Rukoto such covered barrel outer peripheral surface continuously with the grip and the outer package Characteristic writing instrument.