JP2006102956A - Ball-point pen tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball-point pen tip part which allows a smooth rotation of a ball without shakiness and loss of directional property and also, the apex of a small diametral part to be securely positioned in the center of an ink outflow gap of a ball receiving seat and can minimize the dispersion of a ball pressing force without fear about the generation of assembling failure. <P>SOLUTION: In this ball-point pen tip, the ink outflow gap 24 radially extending from the center to outward in the diametral direction, is formed between inward protrusion parts 22 for the ball receiving seat. In addition, a pressing member 3 made of a synthetic resin is formed of a large diametral part 31 and a small diametral part 32 protruding forward from the axial center of the large diametral part 31. Further, the small diametral part 32 is inserted through the center of the radially extending ink outflow gap 24, and the apex of the small diametral part 32 presses the rear surface of the ball 23 forward. On the other hand, the large diametral part 31 is loosely inserted through a capillary 2 located behind the inward protrusion part 22. A spring 5 presses the pressing member 3 forward. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ボールペン先端部に関する。詳細には、複数の内方突出部よりなるボール受け座を備えたボールペン先端部に関する。   The present invention relates to a ballpoint pen tip. In detail, it is related with the ball-point pen front-end | tip part provided with the ball receiving seat which consists of a several inward protrusion part.

従来、ボールペン先端部において、特許文献１には、複数の内方突出部よりなるボール受け座を形成し、内方突出部の相互間の放射状のインキ流出間隙にスプリングのストレート部を挿通させ、前記ストレート部の先端によりボールを前方に押圧し、該ボールを先端縁部内周面に圧接させる構成のボールペン先端部が開示されている。   Conventionally, at the tip of the ballpoint pen, Patent Document 1 forms a ball receiving seat composed of a plurality of inward protruding portions, and the straight portion of the spring is inserted into the radial ink outflow gap between the inward protruding portions, A ballpoint pen tip having a configuration in which the ball is pressed forward by the tip of the straight portion and pressed against the inner peripheral surface of the tip edge is disclosed.

前記特許文献１のボールペン先端部は、スプリングのストレート部の先端が直にボールと接触する構成であるため、筆記時、ボールの回転に伴うビリツキが生じ、滑らかな筆記感（即ち滑らかなボールの回転）が得られないおそれがある。   The tip of the ballpoint pen of Patent Document 1 has a configuration in which the tip of the straight portion of the spring is in direct contact with the ball. Therefore, during writing, a flickering caused by the rotation of the ball occurs, and a smooth writing feeling (that is, a smooth ball) Rotation) may not be obtained.

また、前記特許文献１のボールペン先端部は、筆記時、ボールの回転によってストレート部の先端が径方向に大きく移動してしまうため、ストレート部の先端がボールの中心を常に押圧することができず、ボールの回転に方向性が生じやすい。   In addition, since the tip of the ballpoint pen of Patent Document 1 moves greatly in the radial direction due to the rotation of the ball during writing, the tip of the straight part cannot always press the center of the ball. The direction of rotation of the ball is likely to occur.

さらに、前記特許文献１のボールペン先端部は、ストレート部の先端が、内方突出部の相互間の放射状のインキ流出間隙に挿入される時、該ストレート部の先端がインキ流出間隙の中心部から外れた周縁端部に食いつき、組立不良（例えば、ボールの回転不良や、内向きの先端縁部とボールとの密接不良）が生じるおそれがある。   Further, the tip of the ballpoint pen of Patent Document 1 is such that when the tip of the straight portion is inserted into the radial ink outflow gap between the inwardly protruding portions, the tip of the straight portion extends from the center of the ink outflow gap. There is a possibility that the disassembled peripheral edge will bite and assembly failure (for example, defective rotation of the ball or inadequate contact between the inward tip edge and the ball) may occur.

また、特許文献２には、ボールを前方に付勢する湾曲可能な弾力部（本願の小径部に相当）と、ホルダー内孔に圧入可能な固定部（本願の大径部に相当）とからなる弾性体（本願の押圧部材に相当）が開示されている。   Further, Patent Document 2 includes a bendable elastic portion that biases the ball forward (corresponding to the small diameter portion of the present application) and a fixing portion that can be press-fitted into the holder inner hole (corresponding to the large diameter portion of the present application). An elastic body (corresponding to the pressing member of the present application) is disclosed.

前記特許文献２のボールペン先端部は、弾性体の固定部がチップ本体の内面に圧入嵌合される構成のため、組立時、弾性体の前後方向の固定位置がばらつきやすい。それにより、ボールを前方へ押圧する押圧力が大きくばらつき、押圧力が極端に弱いものや、押圧力が極端に強いものが生じるおそれがある。前記押圧力の極端に弱いものは、先端縁部とボールとの密接不良が発生し、一方、前記押圧力の極端に強いものは、筆記時、高い筆記圧を要し、ユーザーの手に疲労感を与える。   The tip of the ballpoint pen disclosed in Patent Document 2 has a configuration in which the fixing portion of the elastic body is press-fitted and fitted to the inner surface of the chip body, so that the fixing position of the elastic body in the front-rear direction tends to vary during assembly. As a result, the pressing force for pressing the ball forward varies greatly, and there is a possibility that a pressing force is extremely weak or a pressing force is extremely strong. When the pressing force is extremely weak, close contact between the tip edge and the ball occurs. On the other hand, when the pressing force is extremely strong, a high writing pressure is required at the time of writing and the user's hand is fatigued. Give a feeling.

実用新案登録第２５７７５４４号Utility model registration No. 2577544 特許第３１５６９８８号Japanese Patent No. 3156888

本発明は前記従来の問題点を解決するものであって、ビリツキがなく方向性が生じない円滑なボールの回転が得られるとともに、押圧部材の先端がインキ流出間隙の中心部に確実に位置され、組立不良が発生するおそれがなく、しかも、ボール押圧力のばらつきを小さくできるボールペン先端部を提供しようとするものである。   The present invention solves the above-described conventional problems, and can smoothly rotate the ball without causing directionality and the tip of the pressing member is reliably positioned at the center of the ink outflow gap. An object of the present invention is to provide a ballpoint pen tip that is free from the risk of assembly failure and that can reduce variations in ball pressing force.

本発明は、以下の要件を特徴とする。 The present invention is characterized by the following requirements.

（請求項１）
金属製細管の先端に内向きの先端縁部を形成し、前記先端縁部後方の細管の内面にボール受け座用の複数の内方突出部を形成し、前記先端縁部と前記内方突出部との間でボールを回転可能に抱持し、前記内方突出部の相互間に、中心部から径方向外方に放射状に延びるインキ流出間隙を形成し、前記インキ流出間隙に、ボールを前方へ押圧し且つボールを先端縁部の内面に密接させる押圧部材の先端部を挿通させたボールペン先端部であって、前記押圧部材が、大径部と、該大径部の軸心より前方に突出される小径部とからなる合成樹脂製部材であり、前記小径部が前記放射状のインキ流出間隙の中心部に挿通されるとともに前記小径部の先端がボールの後面を前方に押圧し、前記大径部が内方突出部後方の細管内に遊挿されることを特徴とするボールペン先端部。 (Claim 1)
An inward tip edge is formed at the tip of the metal thin tube, and a plurality of inward projections for a ball receiving seat are formed on the inner surface of the thin tube behind the tip edge, and the tip edge and the inward protrusion A ball is rotatably held between the inward projecting portions, an ink outflow gap extending radially outward from the center portion is formed between the inward protruding portions, and the ball is inserted into the ink outflow gap. A tip of a ballpoint pen that is inserted forward through a tip of a pressing member that presses forward and brings the ball into close contact with the inner surface of the tip edge, wherein the pressing member is forward of a large diameter portion and an axis of the large diameter portion A small-diameter portion that protrudes into the center, and the small-diameter portion is inserted into the central portion of the radial ink outflow gap and the tip of the small-diameter portion presses the rear surface of the ball forward, The large diameter part is loosely inserted into the narrow tube behind the inward protruding part. Ballpoint pen tip that.

（請求項２）
前記インキ流出間隙の中心部の仮想内接円の直径を、前記小径部の外径より大きく設定し、前記インキ流出間隙の最小寸法を、前記小径部の外径より小さく設定した請求項１記載のボールペン先端部。 (Claim 2)
The diameter of a virtual inscribed circle at the center of the ink outflow gap is set larger than the outer diameter of the small diameter part, and the minimum dimension of the ink outflow gap is set smaller than the outer diameter of the small diameter part. The tip of the ballpoint pen.

（請求項３）
前記押圧部材の後方にスプリングを配置し、前記スプリングが押圧部材を前方へ押圧してなる請求項１または２記載のボールペン先端部。 (Claim 3)
The tip of a ball-point pen according to claim 1 or 2, wherein a spring is disposed behind the pressing member, and the spring presses the pressing member forward.

（請求項４）
前記押圧部材の後方に、ストレート部と、該ストレート部後端と一体に連設されるコイル部とからなるスプリングを配置し、前記ストレート部の先端が押圧部材の後端を前方へ押圧してなる請求項３記載のボールペン先端部。 (Claim 4)
A spring composed of a straight portion and a coil portion integrally connected to the rear end of the straight portion is disposed behind the pressing member, and the front end of the straight portion presses the rear end of the pressing member forward. The ball-point pen tip portion according to claim 3.

（請求項５）
前記細管外面を保持するホルダーの内面または細管の内面に環状段部を設け、前記環状段部に大径部の後端面を軸方向に当接させ、前記大径部の後端面と前記環状段部との間にインキ流通路を形成し、さらに、前記小径部が湾曲状に弾性変形可能に構成される請求項１または２記載のボールペン先端部。 (Claim 5)
An annular step is provided on the inner surface of the holder for holding the outer surface of the thin tube or the inner surface of the thin tube, and the rear end surface of the large diameter portion is axially contacted with the annular step portion, and the rear end surface of the large diameter portion and the annular step The ball-point pen tip portion according to claim 1 or 2, wherein an ink flow path is formed between the tip portion and the small diameter portion is configured to be elastically deformable in a curved shape.

（請求項６）
前記押圧部材が合成樹脂製棒状体を研削加工または切削加工することにより得られる請求項１乃至５のいずれかに記載のボールペン先端部。 (Claim 6)
The ball-point pen tip portion according to any one of claims 1 to 5, wherein the pressing member is obtained by grinding or cutting a synthetic resin rod-shaped body.

請求項１によれば、ボールの回転不良や、先端縁部とボールとの密接不良等の組立不良が発生するおそれがない。また、筆記時、ボールの回転に方向性が生じない。その上、筆記時のビリツキがなく、円滑な筆記感が得られる。 According to the first aspect, there is no possibility that an assembly failure such as a rotation failure of the ball or a close contact failure between the tip edge and the ball will occur. In addition, there is no directionality in the rotation of the ball during writing. In addition, there is no wobble at the time of writing, and a smooth writing feeling can be obtained.

請求項２によれば、より一層、確実に、小径部がインキ流出間隙の中心部に挿通される。その結果、より一層、ボールの回転不良や、先端縁部とボールとの密接不良等の組立不良の発生を回避し、筆記時、ビリツキのない円滑なボールの回転が得られるとともに方向性のない均一なボールの回転が得られる。 According to the second aspect, the small-diameter portion is more reliably inserted into the central portion of the ink outflow gap. As a result, it is possible to further prevent the occurrence of defective assembly such as defective rotation of the ball and poor contact between the tip edge and the ball, and at the time of writing, smooth rotation of the ball without flickering is obtained and there is no directionality. Uniform ball rotation is obtained.

請求項３によれば、押圧部材を軟質な合成樹脂で構成することが不要となり、押圧部材を硬質な合成樹脂から構成でき、小径部の強度を向上させることができる。 According to the third aspect, it is unnecessary to configure the pressing member with a soft synthetic resin, the pressing member can be configured with a hard synthetic resin, and the strength of the small diameter portion can be improved.

請求項４によれば、従来のストレート部とコイル部からなるスプリングを使用でき、スプリングの取付構造を大きく変更する必要がなく、製造が容易となる。 According to the fourth aspect of the present invention, a conventional spring composed of a straight portion and a coil portion can be used, and it is not necessary to greatly change the mounting structure of the spring, and the manufacture is facilitated.

請求項５によれば、組立時、押圧部材の固定位置が前後方向にばらつくことを抑え、ボール押圧力のばらつきを小さくできる。 According to the fifth aspect, the variation in the ball pressing force can be reduced by suppressing the fixing position of the pressing member from varying in the front-rear direction during assembly.

請求項６によれば、押圧部材を安価に得ることができる。 According to the sixth aspect, the pressing member can be obtained at low cost.

本発明を実施するための最良の形態を説明する。 The best mode for carrying out the present invention will be described.

〔１〕本発明の実施の形態のボールペン先端部１は、金属製細管２の先端に内向きの先端縁部２１を形成し、前記先端縁部２１後方の細管２の内面にボール受け座用の複数の内方突出部２２を形成し、前記先端縁部２１と前記内方突出部２２との間でボール２３を回転可能に抱持し、前記内方突出部２２の相互間に、中心部から径方向外方に放射状に延びるインキ流出間隙２４を形成し、前記インキ流出間隙２４に、ボール２３を前方へ押圧し且つボール２３を先端縁部２１の内面に密接させる押圧部材３の先端部を挿通させたボールペン先端部であって、前記押圧部材３が、大径部３１と、該大径部３１の軸心より前方に突出される小径部３２とからなる合成樹脂製部材であり、前記小径部３２が前記放射状のインキ流出間隙２４の中心部に挿通されるとともに前記小径部３２の先端がボール２３の後面を前方に押圧し、前記大径部３１が内方突出部２２後方の細管２内に遊挿されること（請求項１）を要件とする。 [1] The ballpoint pen tip 1 according to the embodiment of the present invention has an inward tip edge 21 formed at the tip of a metal thin tube 2 and is used for a ball receiving seat on the inner surface of the thin tube 2 behind the tip edge 21. A plurality of inward projecting portions 22, and a ball 23 is rotatably held between the tip edge portion 21 and the inward projecting portion 22, and a center between the inward projecting portions 22 is formed. The tip of the pressing member 3 is formed with an ink outflow gap 24 extending radially outward from the portion, pressing the ball 23 forward in the ink outflow gap 24 and bringing the ball 23 into close contact with the inner surface of the tip edge 21. The tip of the ball-point pen is inserted through a portion, and the pressing member 3 is a synthetic resin member comprising a large-diameter portion 31 and a small-diameter portion 32 that protrudes forward from the axis of the large-diameter portion 31. The small diameter portion 32 is a central portion of the radial ink outflow gap 24. It is a requirement that the tip of the small diameter portion 32 is inserted through and presses the rear surface of the ball 23 forward, and the large diameter portion 31 is loosely inserted into the narrow tube 2 behind the inward projecting portion 22 (Claim 1). To do.

前記ボールペン先端部（請求項１）は、押圧部材３を細管２内に挿入組立する際、大径部３１が細管２内面にガイドされ、小径部３２が確実にインキ流出間隙２４の中心部に挿入される。それにより、ボール２３の回転不良や、先端縁部２１とボール２３との密接不良等の組立不良が発生するおそれがなく、その上、筆記時、小径部３２の先端が、ボール２３後面の中心を確実に押圧し、ボール２３の回転に方向性が生じない。また、前記ボールペン先端部１（請求項１）は、従来のようなスプリングが直にボール２３後面を前方に押圧するのではなく、合成樹脂よりなる小径部３２の先端がボール２３後面に当接し該ボール２３を前方に押圧する構成のため、筆記時のビリツキがなく、円滑な筆記感が得られる。   The tip of the ballpoint pen (Claim 1) is configured such that when the pressing member 3 is inserted and assembled into the narrow tube 2, the large diameter portion 31 is guided by the inner surface of the thin tube 2, and the small diameter portion 32 is reliably positioned at the center of the ink outflow gap 24. Inserted. As a result, there is no risk of a rotation failure of the ball 23 or an assembly failure such as a close contact failure between the tip edge portion 21 and the ball 23, and the tip of the small diameter portion 32 is the center of the rear surface of the ball 23 at the time of writing. Is surely pressed, and the direction of rotation of the ball 23 does not occur. Further, the tip of the ballpoint pen 1 (Claim 1) does not directly press the rear surface of the ball 23 forward by a conventional spring, but the tip of the small diameter portion 32 made of synthetic resin abuts the rear surface of the ball 23. Due to the configuration in which the ball 23 is pressed forward, there is no wobbling at the time of writing and a smooth writing feeling is obtained.

〔２〕前記ボールペン先端部（請求項１）において、前記インキ流出間隙２４の中心部の仮想内接円の直径Ｂを、前記小径部３２の外径Ａより大きく設定し、前記インキ流出間隙２４の最小寸法Ｃを、前記小径部３２の外径Ａより小さく設定すること（請求項２）が好ましい。 [2] In the tip of the ballpoint pen (claim 1), the diameter B of a virtual inscribed circle at the center of the ink outflow gap 24 is set larger than the outer diameter A of the small diameter section 32, and the ink outflow gap 24 is set. Is preferably set smaller than the outer diameter A of the small diameter portion 32 (Claim 2).

前記ボールペン先端部（請求項２）は、小径部３２がインキ流出間隙２４の中心部から外れた周縁端部に食いつくことがなく、より一層、確実に、小径部３２がインキ流出間隙２４の中心部に挿通される。その結果、より一層、ボール２３の回転不良や、先端縁部２１とボール２３との密接不良等の組立不良の発生を回避し、筆記時、ビリツキのない円滑なボール２３の回転が得られるとともに方向性のない均一なボール２３の回転が得られる。   The tip of the ballpoint pen (Claim 2) is such that the small diameter portion 32 does not bite into the peripheral edge portion deviated from the central portion of the ink outflow gap 24, and the small diameter portion 32 is more reliably located in the center of the ink outflow gap 24. Inserted into the section. As a result, the rotation of the ball 23 and the assembly failure such as the close contact between the tip edge 21 and the ball 23 can be avoided, and the smooth rotation of the ball 23 without flickering can be obtained at the time of writing. Uniform rotation of the ball 23 without directionality is obtained.

〔３〕前記ボールペン先端部（請求項１または２）において、前記押圧部材３の後方にスプリング５を配置し、前記スプリング５が押圧部材３を前方へ押圧してなること（請求項３）が好ましい。それにより、押圧部材３に軟質な弾性材料で構成することが不要となり、押圧部材３を硬質な合成樹脂から構成でき、小径部３２の強度を向上させることができる。 [3] In the tip of the ballpoint pen (Claim 1 or 2), a spring 5 is arranged behind the pressing member 3, and the spring 5 presses the pressing member 3 forward (Claim 3). preferable. Accordingly, it is not necessary to configure the pressing member 3 with a soft elastic material, the pressing member 3 can be configured from a hard synthetic resin, and the strength of the small diameter portion 32 can be improved.

〔４〕前記ボールペン先端部（請求項３）において、前記押圧部材３の後方に、ストレート部５１と、該ストレート部５１後端と一体に連設されるコイル部５２とからなるスプリング５を配置し、前記ストレート部５１の先端が押圧部材３の後端を前方へ押圧してなること（請求項４）が好ましい。それにより、従来のストレート部５１とコイル部５２からなるスプリング５を使用でき、スプリング５の取付構造を大きく変更する必要がなく、製造が容易となる。 [4] At the tip of the ballpoint pen (Claim 3), a spring 5 comprising a straight part 51 and a coil part 52 integrally connected to the rear end of the straight part 51 is disposed behind the pressing member 3. And it is preferable that the front-end | tip of the said straight part 51 presses the rear end of the press member 3 ahead (Claim 4). As a result, the conventional spring 5 including the straight portion 51 and the coil portion 52 can be used, and it is not necessary to greatly change the mounting structure of the spring 5, and the manufacture is facilitated.

〔５〕前記ボールペン先端部（請求項１または２）において、前記細管２外面を保持するホルダー４の内面または細管２の内面に環状段部４２を設け、前記環状段部４２に大径部３１の後端面を軸方向に当接させ、前記大径部３１の後端面と前記環状段部４２との間にインキ流通路６を形成し、さらに、前記小径部３２が湾曲状に弾性変形可能に構成されること（請求項５）が好ましい。それにより、組立時、押圧部材３の固定位置が前後方向にばらつくことを抑え、ボール押圧力の製造ばらつきを小さくできる。 [5] At the tip of the ballpoint pen (Claim 1 or 2), an annular step 42 is provided on the inner surface of the holder 4 holding the outer surface of the thin tube 2 or the inner surface of the thin tube 2, and the large-diameter portion 31 is provided on the annular step 42. The rear end surface is brought into contact with the axial direction, the ink flow passage 6 is formed between the rear end surface of the large diameter portion 31 and the annular step portion 42, and the small diameter portion 32 can be elastically deformed in a curved shape. (Claim 5) is preferable. Thereby, at the time of assembly, the fixing position of the pressing member 3 can be prevented from varying in the front-rear direction, and the manufacturing variation of the ball pressing force can be reduced.

〔６〕前記ボールペン先端部（請求項１乃至５）において、前記押圧部材３が合成樹脂製棒状体を研削加工または切削加工することにより得られること（請求項６）が好ましい。それにより、押圧部材３を安価に得ることができる。もし、押圧部材３を金型による樹脂成形体により得る場合、製造コストが上昇し、安価に得ることは困難である。 [6] It is preferable that the pressing member 3 is obtained by grinding or cutting a synthetic resin rod-shaped body at the tip of the ballpoint pen (Claims 1 to 5) (Claim 6). Thereby, the pressing member 3 can be obtained at low cost. If the pressing member 3 is obtained by a resin molded body using a metal mold, the manufacturing cost increases and it is difficult to obtain it at a low cost.

〔第１実施例〕
図１及び図２に本発明の第１実施例を示す。
本実施例のボールペン先端部１は、先端部にボール２３を回転可能に抱持した金属製細管２と、該細管２の後部が前部に圧入固着されたホルダー４と、細管２内に遊挿配置された押圧部材３と、前記押圧部材３を前方に付勢するスプリング５とからなる。 [First embodiment]
1 and 2 show a first embodiment of the present invention.
The ball-point pen tip 1 of this embodiment includes a metal thin tube 2 that has a ball 23 rotatably held at the tip, a holder 4 with a rear portion of the thin tube 2 press-fitted and fixed to the front, and a loose tube in the tube 2. The pressing member 3 is inserted and arranged, and the spring 5 biases the pressing member 3 forward.

前記細管２は、直管状円筒体であり、具体的には、ＳＵＳ３０４、ＳＵＳ３２１等のオーステナイト系ステンレス鋼からなる。前記細管２の先端には、内方への環状の折り曲げ加工（カシメ加工）により内向きの先端縁部２１が形成される。前記先端縁部２１の後方の細管２の内周面には、径方向外方から内方へのポンチ加工により周方向等間隔に複数（例えば３個または４個）の内方突出部２２が形成される。前記先端縁部２１と前記内方突出部２２との間で、ボール２３が回転可能に抱持される。前記複数の内方突出部２２はボール受け座を構成する。前記内方突出部２２の相互間には、中心部から径方向外方に放射状に延びるインキ流出間隙２４が形成される。   The thin tube 2 is a straight tubular cylinder, and is specifically made of austenitic stainless steel such as SUS304 or SUS321. An inward leading edge portion 21 is formed at the leading end of the thin tube 2 by an inward annular bending process (caulking process). A plurality of (for example, three or four) inward protruding portions 22 are provided at equal intervals in the circumferential direction by punching from the radially outer side to the inner side on the inner peripheral surface of the narrow tube 2 behind the tip edge 21. It is formed. A ball 23 is rotatably held between the tip edge 21 and the inward protrusion 22. The plurality of inward projections 22 constitute a ball receiving seat. An ink outflow gap 24 that extends radially outward from the center portion is formed between the inward protruding portions 22.

前記押圧部材３は、合成樹脂製の円柱状棒状体を研削加工または切削加工することにより得られる。前記押圧部材３は、例えば、ポリアセタール樹脂等の硬質な合成樹脂からなる。前記押圧部材３は、大径部３１と、該大径部３１の先端面の軸心より前方に突出される小径部３２とからなる。前記大径部３１と前記小径部３２は一体に連設される。   The pressing member 3 is obtained by grinding or cutting a cylindrical rod-shaped body made of synthetic resin. The pressing member 3 is made of a hard synthetic resin such as polyacetal resin, for example. The pressing member 3 includes a large-diameter portion 31 and a small-diameter portion 32 that protrudes forward from the axial center of the tip surface of the large-diameter portion 31. The large diameter portion 31 and the small diameter portion 32 are integrally connected.

前記小径部３２の外径Ａは、放射状のインキ流出間隙２４の最小寸法Ｃより大きく設定される。また、前記小径部３２の外径Ａは、インキ流出間隙２４の中心部の仮想内接円の直径Ｂ（即ち内方突出部２２の頂点に接する仮想内接円の直径Ｂ）より小さく設定される。それにより、前記小径部３２は、インキ流出間隙２４の周縁端部に食いつくことがなく、適正にインキ流出間隙２４の中心部に挿通させ、ボール２３後面の中心を適正に前方へ押圧することができる。   The outer diameter A of the small diameter portion 32 is set larger than the minimum dimension C of the radial ink outflow gap 24. The outer diameter A of the small diameter portion 32 is set smaller than the diameter B of the virtual inscribed circle at the center of the ink outflow gap 24 (that is, the diameter B of the virtual inscribed circle in contact with the apex of the inward protruding portion 22). The As a result, the small diameter portion 32 does not bite into the peripheral edge portion of the ink outflow gap 24, and can be properly inserted into the center portion of the ink outflow gap 24 to properly push the center of the rear surface of the ball 23 forward. it can.

前記大径部３１の外径は、細管２内径より僅かに小さく設定される。前記大径部３１の外面と細管２の内面との間には、インキ通路２５が形成される。前記大径部３１の外径は、前記細管２の内径の７５％〜９５％の範囲が好ましく、前記範囲に設定することにより、適正なインキ流出性を有するインキ通路２５を確保ができるとともに、押圧部材３が細管２内で径方向に大きくがたつくことを抑えることができる。本実施例では、前記大径部３１の外周面は横断面円形状であるが、これ以外にも、例えば、前記大径部３１の外面に軸方向にインキ通路２５を構成する溝を貫設し、前記大径部３１の外面を異形状にすることもできる。   The outer diameter of the large diameter portion 31 is set slightly smaller than the inner diameter of the thin tube 2. An ink passage 25 is formed between the outer surface of the large diameter portion 31 and the inner surface of the thin tube 2. The outer diameter of the large-diameter portion 31 is preferably in the range of 75% to 95% of the inner diameter of the thin tube 2, and by setting it in the above range, it is possible to ensure the ink passage 25 having proper ink outflow, It is possible to suppress the pressing member 3 from greatly shaking in the radial direction within the thin tube 2. In the present embodiment, the outer peripheral surface of the large-diameter portion 31 has a circular cross section, but other than this, for example, a groove that configures the ink passage 25 in the axial direction is provided on the outer surface of the large-diameter portion 31. And the outer surface of the said large diameter part 31 can also be made into a different shape.

また、前記小径部３２と前記大径部３１との間には、前方に向かうに従って次第に小径となるテーパ部３３が形成される。それにより、小径部３２の折れ曲がり強度を向上させるとともに、充填後のインキ内部の空気を除去する遠心処理の際に、細管２内の空気を後方へスムーズに移動させ、細管２内に空気が残留することを回避できる。   Further, a tapered portion 33 that gradually becomes smaller in diameter as it goes forward is formed between the small diameter portion 32 and the large diameter portion 31. As a result, the bending strength of the small-diameter portion 32 is improved, and the air in the thin tube 2 is smoothly moved rearward during the centrifugal treatment to remove the air inside the ink after filling, and the air remains in the thin tube 2. Can be avoided.

前記スプリング５は、コイル部５２と該コイル部５２より軸方向前方に延びるストレート部５１とからなる。前記ストレート部５１の先端が押圧部材３の後端面（即ち大径部３１の後端面）を前方に押圧している。本実施例では、前記スプリング５による弾発力（即ち押圧部材３を介してボール２３を前方に押圧するボール押圧力）は、１０グラム〜１５グラムに設定される。   The spring 5 includes a coil portion 52 and a straight portion 51 extending forward in the axial direction from the coil portion 52. The front end of the straight portion 51 presses the rear end surface of the pressing member 3 (that is, the rear end surface of the large diameter portion 31) forward. In this embodiment, the resilient force of the spring 5 (that is, the ball pressing force that presses the ball 23 forward via the pressing member 3) is set to 10 to 15 grams.

前記ホルダー４は先端に取付孔４１を備え、該取付孔４１に細管２の後部が圧入固着される。前記取付孔４１の後方のホルダー４内部には、前記スプリング５のコイル部５２が取り付けられる。前記ホルダー４は合成樹脂の射出成形により得られる。   The holder 4 has a mounting hole 41 at the tip, and the rear portion of the thin tube 2 is press-fitted and fixed to the mounting hole 41. A coil portion 52 of the spring 5 is attached inside the holder 4 behind the attachment hole 41. The holder 4 is obtained by injection molding of synthetic resin.

〔第２実施例〕
図３に本発明の第２実施例を示す
本実施例のボールペン先端部１は、第１実施例の変形例である。
スプリング５が、コイル部のみからなり、内方突出部２２後方の細管２内に収容される。前記スプリング５の後端が、ホルダー４の取付孔４１の底部に設けた環状段部４２に当接される。一方、前記スプリング５の先端が、押圧部材３の後端面（大径部３１の後端面）に当接し、押圧部材３を前方に押圧する。また、本実施例の押圧部材３の大径部３１の長手寸法は、第１実施例の押圧部材３の大径部３１の長手寸法よりも短く設定される。本実施例の前記以外の構成は、第１実施例と同様であるため、説明を省略する。 [Second Embodiment]
FIG. 3 shows a second embodiment of the present invention. A ballpoint pen tip 1 of the present embodiment is a modification of the first embodiment.
The spring 5 consists only of a coil portion and is accommodated in the narrow tube 2 behind the inward protruding portion 22. The rear end of the spring 5 is brought into contact with an annular step 42 provided at the bottom of the mounting hole 41 of the holder 4. On the other hand, the tip of the spring 5 abuts against the rear end surface of the pressing member 3 (the rear end surface of the large diameter portion 31), and presses the pressing member 3 forward. Moreover, the longitudinal dimension of the large diameter part 31 of the pressing member 3 of a present Example is set shorter than the longitudinal dimension of the large diameter part 31 of the pressing member 3 of 1st Example. Since the configuration of the present embodiment other than the above is the same as that of the first embodiment, description thereof is omitted.

〔第３実施例〕
図４に本発明のボールペン先端部１の第２実施例を示す
本実施例のボールペン先端部１は、第１、第２実施例の変形例であり、第１、第２実施例と異なる点は、スプリングが存在せず、押圧部材３のみでボール２３を前方に押圧する構成である。本実施例の押圧部材３は、第１、第２実施例同様、合成樹脂（例えばポリアセタール樹脂）製棒状体を研削加工または切削加工により得られる。前記押圧部材３は、内方突出部２２後方の細管２内に収容される。そして、前記小径部３２の先端がボール２３後面を前方に押圧し、前記大径部３１の後端面が、ホルダー４の環状段部４２に当接される。 [Third embodiment]
FIG. 4 shows a second embodiment of the ballpoint pen tip 1 according to the present invention. The ballpoint tip 1 of the present embodiment is a modification of the first and second embodiments, and is different from the first and second embodiments. Is a configuration in which no spring is present and the ball 23 is pressed forward only by the pressing member 3. As in the first and second embodiments, the pressing member 3 of the present embodiment is obtained by grinding or cutting a rod-shaped body made of a synthetic resin (for example, polyacetal resin). The pressing member 3 is accommodated in the narrow tube 2 behind the inward projecting portion 22. The tip of the small diameter portion 32 presses the rear surface of the ball 23 forward, and the rear end surface of the large diameter portion 31 is brought into contact with the annular step portion 42 of the holder 4.

前記押圧部材３の小径部３２は第１、第２実施例より長手寸法が長く設定され、湾曲状に弾性変形可能に構成される。前記小径部３２の湾曲状の弾性変形によりボール押圧力（具体的には１０グラム〜１５グラム）を得る。一方、前記押圧部材３の大径部３１の後端面には、切欠３１ａ（詳細には軸線に対する非垂直面よりなる傾斜カット面）が形成される。前記切欠３１ａ（傾斜カット面）により、前記大径部３１の後端面と環状段部４２との間にインキ流通路６が確実に形成される。本実施例では、前記切欠３１ａは、大径部３１の後端面を斜めにカットすることにより得られ、製造が極めて容易である。尚、前記切欠３１ａは、これ以外の構成（例えば複数の溝や複数の凹凸等）でもよい。本実施例の前記以外の構成は、第１、第２実施例と同様であるため、説明を省略する。   The small-diameter portion 32 of the pressing member 3 has a longer dimension than the first and second embodiments, and is configured to be elastically deformable in a curved shape. Ball pressing force (specifically, 10 grams to 15 grams) is obtained by the curved elastic deformation of the small diameter portion 32. On the other hand, a notch 31a (specifically, an inclined cut surface made of a non-perpendicular surface with respect to the axis) is formed on the rear end surface of the large-diameter portion 31 of the pressing member 3. The ink flow passage 6 is reliably formed between the rear end surface of the large-diameter portion 31 and the annular step portion 42 by the notch 31a (inclined cut surface). In the present embodiment, the notch 31a is obtained by obliquely cutting the rear end surface of the large diameter portion 31, and is extremely easy to manufacture. The cutout 31a may have other configurations (for example, a plurality of grooves and a plurality of irregularities). Since the configuration of the present embodiment other than the above is the same as that of the first and second embodiments, description thereof will be omitted.

〔適用例〕
図５に第１実施例のボールペン先端部１を適用したボールペン７の例を示す。本適用例のボールペン７は、先端部にボール２３を回転可能に抱持した細管２と、該細管２の後部が前部に圧入固着されたホルダー４と、該ホルダー４の後部が先端開口部に圧入固着されたインキ収容筒７１と、該インキ収容筒７１内に収容されるインキ７１ａ及び追従体７１ｂと、前記ホルダー４の内部に収容配置されるスプリング５と、前記インキ収容筒７１の後端開口部に圧入固着される、通気孔７２ａを備えた尾栓７２とからなる。 [Application example]
FIG. 5 shows an example of a ballpoint pen 7 to which the ballpoint tip 1 of the first embodiment is applied. The ballpoint pen 7 of this application example includes a thin tube 2 that rotatably holds a ball 23 at the tip, a holder 4 in which the rear portion of the thin tube 2 is press-fitted and fixed to the front, and a rear portion of the holder 4 that has a tip opening. An ink receiving cylinder 71 press-fitted into the ink receiving cylinder 71, an ink 71a and a follower 71b accommodated in the ink accommodating cylinder 71, a spring 5 accommodated in the holder 4, and the rear of the ink accommodating cylinder 71. It consists of a tail plug 72 having a vent 72a that is press-fitted and fixed to the end opening.

前記インキ収容筒７１の内部には、インキ７１ａと、該インキ７１ａの後端に配置され、該インキ７１ａの消費に伴って前進する高粘度流体からなる追従体７１ｂとが充填される。前記インキ７１ａは、例えば、低粘度の水性または油性インキ、または剪断減粘性を有する水性または油性ゲルインキ等が挙げられる。前記追従体７１ｂは、例えば、高粘度流体のみからなる構成、または高粘度流体中に固形物を収容させた構成が挙げられる。   The ink containing cylinder 71 is filled with ink 71a and a follower 71b made of a high-viscosity fluid that is disposed at the rear end of the ink 71a and moves forward as the ink 71a is consumed. Examples of the ink 71a include a low-viscosity aqueous or oily ink, or an aqueous or oily gel ink having shear thinning viscosity. Examples of the follower 71b include a configuration made of only a high-viscosity fluid, or a configuration in which a solid is contained in a high-viscosity fluid.

前記スプリング５は、前部のストレート部５１と後部のコイル部５２とが一体に連設されてなる。前記コイル部５２の後端部には、外径が前方のコイル部５２より大きく設定された密着巻部よりなる膨出部５３が形成される。前記膨出部５３がホルダー４内周面の係止突起４３を後方より乗り越えて、前記係止突起４３に係止される。それにより、スプリング５が圧縮状態で保持される。   The spring 5 includes a front straight portion 51 and a rear coil portion 52 that are integrally connected. A bulging portion 53 is formed at the rear end portion of the coil portion 52. The bulging portion 53 is formed of a tightly wound portion whose outer diameter is set larger than that of the front coil portion 52. The bulging portion 53 gets over the locking projection 43 on the inner peripheral surface of the holder 4 from behind and is locked to the locking projection 43. Thereby, the spring 5 is held in a compressed state.

前記ストレート部５１の先端が、押圧部材３の後端面に当接するとともに該押圧部材３を前方に押圧し、該押圧部材３が、ボール２３を前方に押圧する。それにより、ボール２３が細管２先端の先端縁部２１内周面に密接され、ペン先（即ちボール２３と先端縁部２１内周面との間）がシールされる。前記先端縁部２１内周面にボール２３が密接されることにより、ペン先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。   The front end of the straight portion 51 contacts the rear end surface of the pressing member 3 and presses the pressing member 3 forward, and the pressing member 3 presses the ball 23 forward. Thereby, the ball 23 is brought into close contact with the inner peripheral surface of the tip edge 21 at the tip of the thin tube 2, and the pen tip (that is, between the ball 23 and the inner peripheral surface of the tip edge 21) is sealed. Even if the ball 23 is in close contact with the inner peripheral surface of the tip edge 21, even if stored in a state where the pen tip is downward, ink leakage from the pen tip is prevented, and even if stored in a state where the pen tip is upward, Air contamination from the nib is prevented.

前記適用例のボールペン７を筆記したところ、ビリツキを感じず、しかも、ボール２３の回転に方向性が生じず、円滑に筆記することができた。   When the ballpoint pen 7 of the application example was written, it was possible to write smoothly without feeling tingling and without causing directionality in the rotation of the ball 23.

本発明の第１実施例の縦断面図である。It is a longitudinal cross-sectional view of 1st Example of this invention. 図１、図３及び図４のＸ−Ｘ線拡大断面図てある。FIG. 5 is an enlarged sectional view taken along line XX in FIGS. 1, 3, and 4. 本発明の第２実施例の縦断面図である。It is a longitudinal cross-sectional view of 2nd Example of this invention. 本発明の第３実施例の縦断面図である。It is a longitudinal cross-sectional view of 3rd Example of this invention. 本発明で得られるボールペン先端部を適用したボールペンの例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the example of the ball-point pen to which the ball-point pen front-end | tip part obtained by this invention is applied.

符号の説明Explanation of symbols

１ ボールペン先端部
２ 細管
２１ 先端縁部
２２ 内方突出部
２３ ボール
２４ インキ流出間隙
２５ インキ通路
３ 押圧部材
３１ 大径部
３１ａ 切欠
３２ 小径部
３３ テーパ部
４ ホルダー
４１ 取付孔
４２ 環状段部
４３ 係止突起
５ スプリング
５１ ストレート部
５２ コイル部
５３ 膨出部
６ インキ流通路
７ ボールペン
７１ インキ収容筒
７１ａ インキ
７１ｂ 追従体
７２ 尾栓
７２ａ 通気孔
Ａ 小径部の外径
Ｂ インキ流出間隙の中心部の仮想内接円の直径
Ｃ インキ流出間隙の最小寸法 DESCRIPTION OF SYMBOLS 1 Ball-point pen front-end | tip part 2 Narrow tube 21 Front-end edge part 22 Inward protrusion part 23 Ball 24 Ink outflow gap 25 Ink passage 3 Press member 31 Large diameter part 31a Notch 32 Small diameter part 33 Taper part 4 Holder 41 Attachment hole 42 Annular step part 43 Engagement Stop projection 5 Spring 51 Straight part 52 Coil part 53 Swelling part 6 Ink flow passage 7 Ball pen 71 Ink storage cylinder 71a Ink 71b Follower 72 Tail plug 72a Vent hole A Outer diameter B of small diameter part Virtual center of ink outflow gap Inscribed circle diameter C Minimum dimension of ink outflow gap

Claims (6)

金属製細管の先端に内向きの先端縁部を形成し、前記先端縁部後方の細管の内面にボール受け座用の複数の内方突出部を形成し、前記先端縁部と前記内方突出部との間でボールを回転可能に抱持し、前記内方突出部の相互間に、中心部から径方向外方に放射状に延びるインキ流出間隙を形成し、前記インキ流出間隙に、ボールを前方へ押圧し且つボールを先端縁部の内面に密接させる押圧部材の先端部を挿通させたボールペン先端部であって、前記押圧部材が、大径部と、該大径部の軸心より前方に突出される小径部とからなる合成樹脂製部材であり、前記小径部が前記放射状のインキ流出間隙の中心部に挿通されるとともに前記小径部の先端がボールの後面を前方に押圧し、前記大径部が内方突出部後方の細管内に遊挿されることを特徴とするボールペン先端部。 An inward tip edge is formed at the tip of the metal thin tube, and a plurality of inward projections for a ball receiving seat are formed on the inner surface of the thin tube behind the tip edge, and the tip edge and the inward protrusion A ball is rotatably held between the inward projecting portions, an ink outflow gap extending radially outward from the center portion is formed between the inward protruding portions, and the ball is inserted into the ink outflow gap. A tip of a ballpoint pen that is inserted forward through a tip of a pressing member that presses forward and brings the ball into close contact with the inner surface of the tip edge, wherein the pressing member is forward of a large diameter portion and an axis of the large diameter portion A small-diameter portion that protrudes into the center, and the small-diameter portion is inserted into the central portion of the radial ink outflow gap and the tip of the small-diameter portion presses the rear surface of the ball forward, The large diameter part is loosely inserted into the narrow tube behind the inward protruding part. Ballpoint pen tip that. 前記インキ流出間隙の中心部の仮想内接円の直径を、前記小径部の外径より大きく設定し、前記インキ流出間隙の最小寸法を、前記小径部の外径より小さく設定した請求項１記載のボールペン先端部。 The diameter of the virtual inscribed circle at the center of the ink outflow gap is set larger than the outer diameter of the small diameter part, and the minimum dimension of the ink outflow gap is set smaller than the outer diameter of the small diameter part. The tip of the ballpoint pen. 前記押圧部材の後方にスプリングを配置し、前記スプリングが押圧部材を前方へ押圧してなる請求項１または２記載のボールペン先端部。 The ballpoint pen tip according to claim 1 or 2, wherein a spring is arranged behind the pressing member, and the spring presses the pressing member forward. 前記押圧部材の後方に、ストレート部と、該ストレート部後端と一体に連設されるコイル部とからなるスプリングを配置し、前記ストレート部の先端が押圧部材の後端を前方へ押圧してなる請求項３記載のボールペン先端部。 A spring composed of a straight portion and a coil portion integrally connected to the rear end of the straight portion is disposed behind the pressing member, and the front end of the straight portion presses the rear end of the pressing member forward. The ball-point pen tip portion according to claim 3. 前記細管外面を保持するホルダーの内面または細管の内面に環状段部を設け、前記環状段部に大径部の後端面を軸方向に当接させ、前記大径部の後端面と前記環状段部との間にインキ流通路を形成し、さらに、前記小径部が湾曲状に弾性変形可能に構成される請求項１または２記載のボールペン先端部。 An annular step is provided on the inner surface of the holder for holding the outer surface of the thin tube or the inner surface of the thin tube, and the rear end surface of the large diameter portion is axially contacted with the annular step portion, and the rear end surface of the large diameter portion and the annular step The ball-point pen tip according to claim 1 or 2, wherein an ink flow path is formed between the ball-point pen and the small-diameter portion is configured to be elastically deformable in a curved shape. 前記押圧部材が合成樹脂製棒状体を研削加工または切削加工することにより得られる請求項１乃至５のいずれかに記載のボールペン先端部。 The ball-point pen tip portion according to any one of claims 1 to 5, wherein the pressing member is obtained by grinding or cutting a synthetic resin rod-shaped body.

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