JP5522795B2

JP5522795B2 - Ballpoint pen

Info

Publication number: JP5522795B2
Application number: JP2010235971A
Authority: JP
Inventors: 誠大屋; 橋本　　猛
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2014-06-18
Anticipated expiration: 2030-10-20
Also published as: JP2012086479A

Description

本発明は、ボールペンに関する。 The present invention relates to a ballpoint pen.

従来、特許文献１には、金属製のチップ本体の先端に内向きの先端縁部を設け、前記先端縁部の後方のチップ本体内面に複数の内方突出部を内方への押圧変形により設け、前記先端縁部と前記内方突出部との間に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、ボールを前方へ付勢し且つボールを先端縁部の内面に密接させるロッド部を挿通させてなるボールペンであって、前記インキ流出間隙の中心部の仮想内接円の直径を、前記ロッド部の外径より大きく設定するとともに、前記インキ流出間隙の最小寸法を、前記ロッド部の外径より小さく設定したことを特徴とするボールペンが記載されている。 Conventionally, in Patent Document 1, an inward tip edge is provided at the tip of a metal chip body, and a plurality of inward protrusions are formed on the inner surface of the chip body behind the tip edge by inward deformation. An ink outflow gap extending radially outward from a central portion between the inner projecting portions and rotatably holding a ball between the tip edge portion and the inner projecting portion. A ballpoint pen formed by inserting a rod portion for biasing the ball forward and intimately contacting the ball with the inner surface of the tip edge portion in the ink outflow gap. A ballpoint pen is described in which the diameter of a circle is set larger than the outer diameter of the rod portion, and the minimum dimension of the ink outflow gap is set smaller than the outer diameter of the rod portion.

特開２００３−１３６８７７号公報JP 2003-136877 A

前記特許文献１に記載のボールペンは、ロッド部がインキ流出間隙の周縁端部の近傍に入り込むことを防止できるとしても、ロッド部がチップ本体の中間部で撓むことにより、ロッド部のボールの前方への付勢が不安定となり、ボールと前端縁部内面との密接（即ちシール性）が低下するおそれがある。 Although the ballpoint pen described in Patent Document 1 can prevent the rod portion from entering the vicinity of the peripheral edge of the ink outflow gap, the rod portion bends at the middle portion of the chip body, thereby The forward urging becomes unstable, and the close contact (that is, the sealing property) between the ball and the inner surface of the front end edge may be lowered.

本発明は前記従来の問題点を解決するものであって、ロッド部がチップ本体の中間部で撓むことを抑止し、ボールと前端縁部との確実なシール性が得られるボールペンを提供しようとするものである。 The present invention solves the above-described conventional problems, and provides a ballpoint pen that prevents the rod portion from bending at the middle portion of the chip body and provides a reliable sealing property between the ball and the front end edge portion. It is what.

＜１＞本願の第１の発明は、金属製のチップ本体２の前端に内向きの前端縁部４を設け、前記前端縁部４の後方のチップ本体２内面に内方への押圧変形により形成した複数の内方突出部からなるボール受け座５を設け、前記前端縁部４と前記ボール受け座５との間で回転可能にボール３を抱持し、前記ボール受け座用の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５１を形成し、前記インキ流出間隙５１に、ボール３を前方に付勢し且つボール３を前端縁部４の内面に密接させるロッド部８１を遊挿させてなるボールペンであって、前記チップ本体２の中間部内面に、内方への押圧変形により形成した複数の内方突出部からなる、ロッド部８１の撓み変形を抑止する変形抑止部７・７Ａ・７Ｂを設け、前記変形抑止部用の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７１・７１Ａ・７１Ｂを形成し、前記変形抑止部用の内方突出部の相互間のインキ流出間隙７１・７１Ａ・７１Ｂに前記ロッド部８１を遊挿させてなることを要件とする。 <1> In the first invention of the present application, an inward front end edge portion 4 is provided at a front end of a metal chip main body 2, and the inner surface of the chip main body 2 behind the front end edge portion 4 is deformed by inward deformation. A ball receiving seat 5 composed of a plurality of inward protruding portions is provided, and the ball 3 is held between the front end edge portion 4 and the ball receiving seat 5 so as to be rotatable. An ink outflow gap 51 extending radially outward from the central portion is formed between the protrusions, and the ball 3 is urged forward in the ink outflow gap 51 and the ball 3 is moved to the front edge 4. A ballpoint pen formed by loosely inserting a rod portion 81 to be brought into close contact with the inner surface of the rod body 81, comprising a plurality of inwardly projecting portions formed on the inner surface of the intermediate portion of the chip body 2 by inward pressing deformation. Deformation restraining portions 7, 7A and 7B for restraining bending deformation are provided, Ink outflow gaps 71, 71A, 71B extending radially outward from the central portion between the inward protruding portions for the shape suppressing portion are formed, and between the inward protruding portions for the deformation suppressing portion It is a requirement that the rod portion 81 is loosely inserted into the ink outflow gaps 71, 71A, 71B.

前第１の発明のボールペン１は、チップ本体２の中間部内面に、内方への押圧変形により形成した複数の内方突出部からなる、ロッド部８１の撓み変形を抑止する変形抑止部７・７Ａ・７Ｂを設け、前記変形抑止部用の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７１・７１Ａ・７１Ｂを形成し、前記変形抑止部用の内方突出部の相互間のインキ流出間隙７１・７１Ａ・７１Ｂに前記ロッド部８１を遊挿させてなることにより、チップ本体２の中間部において、ロッド部８１の撓み変形を十分に抑止できる。その結果、ロッド部８１前端によってボール３が適正に前方に付勢され、ボール３と前端縁部４内面との確実なシール性が得られる。 The ballpoint pen 1 according to the first aspect of the invention comprises a deformation inhibiting portion 7 for inhibiting the bending deformation of the rod portion 81, which is composed of a plurality of inwardly projecting portions formed on the inner surface of the intermediate portion of the chip body 2 by inward deformation. 7A and 7B are provided, and ink outflow gaps 71, 71A, and 71B extending radially outward from the central portion are formed between the inward protruding portions for the deformation suppressing portion, The rod portion 81 is loosely inserted into the ink outflow gaps 71, 71A, 71B between the inwardly protruding portions, so that the bending deformation of the rod portion 81 can be sufficiently suppressed in the intermediate portion of the chip body 2. As a result, the ball 3 is appropriately biased forward by the front end of the rod portion 81, and a reliable sealing property between the ball 3 and the inner surface of the front end edge portion 4 is obtained.

＜２＞本願の第２の発明は、前記第１の発明のボールペン１において、前記ボール受け座用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定され、且つ、前記変形抑止部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定されることを要件とする。 <2> According to a second invention of the present application, in the ballpoint pen 1 of the first invention, the diameter of a virtual inscribed circle that contacts the apex of the inward protruding portion for the ball receiving seat is greater than the diameter of the rod portion 81. It is a requirement that the diameter of a virtual inscribed circle that is set to be large and that is in contact with the apex of the inward protruding portion for the deformation suppressing portion is set to be larger than the diameter of the rod portion 81.

前記第２の発明のボールペン１は、前記ボール受け座用の内方突出部の頂点に接する仮想内接円の直径、及び前記変形抑止部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定されることにより、ボール受け座５の中心、及び変形抑止部７・７Ａ・７Ｂの中心にロッド部８１を確実に遊挿させることができる。前記ロッド部８１の横断面形状は、円形状、楕円形状、多角形状等のいずれであってもよい。前記ロッド部８１の直径とは、ロッド部８１の外径の最大値をいう。前記ロッド部８１とは、それ自体が撓んだり圧縮変形したりしてもよいし、その後端にコイル部またはゴム等の弾性部材を配設してもよい。 The ballpoint pen 1 of the second invention has a virtual inscribed circle that is in contact with the apex of the inward protruding portion for the ball seat and a virtual inscribed circle that is in contact with the apex of the inward protruding portion for the deformation inhibiting portion. Is set larger than the diameter of the rod portion 81, the rod portion 81 can be securely inserted into the center of the ball receiving seat 5 and the center of the deformation restraining portions 7, 7A, 7B. The cross-sectional shape of the rod portion 81 may be any of a circular shape, an elliptical shape, a polygonal shape, and the like. The diameter of the rod portion 81 refers to the maximum value of the outer diameter of the rod portion 81. The rod portion 81 may be bent or compressed and may be provided with an elastic member such as a coil portion or rubber at the rear end thereof.

＜３＞本願の第３の発明は、前記第１または第２の発明のボールペン１において、前記変形抑止部７が、周状に等間隔で配置される複数の内方突出部よりなる第１の変形抑止部７Ａと、該第１の変形抑止部７Ａの後方に設けられる、周状に等間隔で配置される複数の内方突出部よりなる第２の変形抑止部７Ｂとからなり、前記第１の変形抑止部７Ａと前記第２の変形抑止部７Ｂとが前後に近接して配置されることを要件とする。 <3> According to a third invention of the present application, in the ballpoint pen 1 of the first or second invention, the deformation suppressing portion 7 includes a plurality of inwardly projecting portions arranged circumferentially at equal intervals. And a second deformation restraining portion 7B composed of a plurality of inwardly projecting portions arranged at equal intervals around the first deformation restraining portion 7A. It is a requirement that the first deformation restraining part 7A and the second deformation restraining part 7B are arranged close to each other in the front-rear direction.

前記第３の発明のボールペン１は、前記変形抑止部用の内方突出部が、前後に近接して配置される、第１の変形抑止部７Ａと第２の変形抑止部７Ｂとからなることにより、チップ本体２の中間部でのロッド部８１の撓み変形を確実に抑えることができる。 The ballpoint pen 1 according to the third aspect of the invention comprises a first deformation restraining portion 7A and a second deformation restraining portion 7B, in which the inward protruding portions for the deformation restraining portion are arranged close to the front and rear. Thus, the bending deformation of the rod portion 81 at the intermediate portion of the chip body 2 can be reliably suppressed.

＜４＞本願の第４の発明は、前記第３の発明のボールペン１において、前記第１の変形抑止部用の内方突出部の相互間の後方に前記第２の変形抑止部用の内方突出部が位置してなることを要件とする。 <4> According to a fourth invention of the present application, in the ballpoint pen 1 of the third invention, the inner part for the second deformation inhibiting part is located behind the inward projecting part for the first deformation inhibiting part. It is a requirement that the side protrusion is located.

前記第４の発明のボールペン１は、前記第１の変形抑止部用の内方突出部の相互間の後方に前記第２の変形抑止部用の内方突出部が位置してなることにより、より一層、チップ本体２の中間部でのロッド部８１の撓み変形を確実に抑えることができる。 In the ballpoint pen 1 of the fourth invention, the inward protruding portion for the second deformation inhibiting portion is located behind the inward protruding portion for the first deformation inhibiting portion, Further, the bending deformation of the rod portion 81 at the intermediate portion of the chip body 2 can be reliably suppressed.

＜５＞本願の第５の発明は、前記第１乃至４の発明のボールペン１において、前記ボール受け座用の内方突出部の後方に、内方への押圧変形により形成した複数の内方突出部からなるガイド部６を設け、前記ボール受け座用の内方突出部と前記ガイド部用の内方突出部とを前後に近接して配置させ、前記ガイド部用の内方突出部の相互間のインキ流出間隙６１に前記ロッド部８１を遊挿させてなることを要件とする。 <5> The fifth invention of the present application is the ball pen 1 of the first to fourth inventions, wherein a plurality of inward portions are formed behind the inwardly projecting portion for the ball seat by inward pressing deformation. A guide portion 6 made of a protrusion is provided, and an inward protrusion for the ball seat and an inward protrusion for the guide are arranged close to each other in the front-rear direction. It is a requirement that the rod portion 81 is loosely inserted into the ink outflow gap 61 between them.

前記第５の発明のボールペン１は、前記ボール受け座用の内方突出部と前記ガイド部用の内方突出部とを前後に近接して配置させたことにより、ロッド部８１をボール受け座５の中心に確実にガイドすることができ、ボール３の中心を安定的に前方に付勢することができる。 In the ballpoint pen 1 of the fifth invention, the inwardly protruding portion for the ball receiving seat and the inwardly protruding portion for the guide portion are arranged close to each other in the front-rear direction, so that the rod portion 81 is placed in the ball receiving seat. The center of the ball 3 can be reliably guided forward, and the center of the ball 3 can be stably urged forward.

＜６＞本願の第６の発明は、前記第５の発明のボールペン１において、前記ガイド部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定されることを要件とする。 <6> According to a sixth invention of the present application, in the ballpoint pen 1 of the fifth invention, the diameter of a virtual inscribed circle that contacts the apex of the inward protruding portion for the guide portion is larger than the diameter of the rod portion 81. It is a requirement to be set.

前記第６の発明のボールペン１は、前記ガイド部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定されることにより、ロッド部８１をガイド部６の中心に確実に遊挿させることができる。 In the ballpoint pen 1 of the sixth invention, the diameter of a virtual inscribed circle that contacts the apex of the inward protruding portion for the guide portion is set larger than the diameter of the rod portion 81, thereby guiding the rod portion 81. It can be surely inserted into the center of the portion 6.

＜７＞本願の第７の発明は、前記第５または第６の発明のボールペン１において、前記ボール受け座用の内方突出部の相互間の後方に前記ガイド部用の内方突出部が位置してなることを要件とする。 <7> According to a seventh invention of the present application, in the ballpoint pen 1 of the fifth or sixth invention, an inward protrusion for the guide portion is provided behind the inward protrusion for the ball receiving seat. It is a requirement to be located.

前記第７の発明のボールペンは、より一層、ロッド部８１をボール受け座５の中心に確実に遊挿させることができる。 In the ballpoint pen according to the seventh aspect of the present invention, the rod portion 81 can be further securely inserted into the center of the ball receiving seat 5.

本発明のボールペンは、ロッド部がチップ本体の中間部で撓むことを抑止し、ボールと前端縁部との確実なシール性が得られる。 The ballpoint pen of the present invention prevents the rod portion from being bent at the middle portion of the chip body, and provides a reliable sealing property between the ball and the front end edge portion.

本発明の第１の実施の形態のボールペンの要部拡大縦断面図である。It is a principal part expansion longitudinal cross-sectional view of the ball-point pen of the 1st Embodiment of this invention. 図１のボールを省略したＡ−Ａ線矢視拡大断面図である。FIG. 2 is an enlarged cross-sectional view taken along line AA with the ball of FIG. 1 omitted. 図１のＢ−Ｂ線矢視拡大断面図である。FIG. 3 is an enlarged cross-sectional view taken along line B-B in FIG. 1. 本発明の実施の形態のボールペンの縦断面図である。It is a longitudinal cross-sectional view of the ball-point pen of embodiment of this invention. 図４の要部拡大断面図である。It is a principal part expanded sectional view of FIG. 本発明の第２の実施の形態のボールペンの要部拡大縦断面図である。It is a principal part expansion longitudinal cross-sectional view of the ball-point pen of the 2nd Embodiment of this invention. 図６のＣ−Ｃ線拡大断面図である。FIG. 7 is an enlarged sectional view taken along the line CC in FIG. 6. 図６のＤ−Ｄ線拡大断面図である。FIG. 7 is an enlarged sectional view taken along line DD of FIG. 6. 本発明の実施の形態のボールペンの縦断面図である。It is a longitudinal cross-sectional view of the ball-point pen of embodiment of this invention. 図９の要部拡大断面図である。It is a principal part expanded sectional view of FIG.

＜第１の実施の形態＞
図１乃至図５に本発明の第１の実施の形態を示す。
本実施の形態のボールペン１は、チップ本体２と、該チップ本体２の後端部を保持するホルダー９と、該ホルダー９の後端部が圧入固着されるインキ収容管１０と、該チップ本体２内及びホルダー９内に収容されるスプリング８と、インキ収容管１０の後端開口部に取り付けられる尾栓１１とからなる。前記インキ収容管１０内には、インキ１０ａと、該インキ１０ａの消費に伴い前進する追従体１０ｂ（例えば高粘度流体と固形物）とが収容される。 <First Embodiment>
1 to 5 show a first embodiment of the present invention.
The ballpoint pen 1 of the present embodiment includes a chip body 2, a holder 9 that holds the rear end portion of the chip body 2, an ink storage tube 10 into which the rear end portion of the holder 9 is press-fitted and fixed, and the chip body. 2 and the spring 9 accommodated in the holder 9 and a tail plug 11 attached to the rear end opening of the ink accommodating tube 10. The ink storage tube 10 stores ink 10a and a follower 10b (for example, a high-viscosity fluid and solid matter) that moves forward as the ink 10a is consumed.

前記スプリング８は、前部のロッド部８１と、後部のコイル部８２とが一体に連設されてなる。前記スプリング８は、ステンレス鋼製線材により形成される。 The spring 8 includes a front rod portion 81 and a rear coil portion 82 that are integrally connected. The spring 8 is formed of a stainless steel wire.

前記チップ本体２は、前端にボール３を回転可能に抱持した金属製（例えばステンレス鋼製）の筒体からなる。前記チップ本体２の前端部には、内方への押圧変形により形成した環状の内向きの前端縁部４と、該前端縁部４の後方に、内方への押圧変形により形成した周状に等間隔に配置される複数の内方突出部よりなるボール受け座５と、該ボール受け座５の後方に配置される、内方への押圧変形により形成した周状に等間隔に配置される複数の内方突出部よりなるガイド部６が設けられる。前記前端縁部４とボール受け座５とによって、ボール３が回転可能且つ前後に移動可能に抱持される。 The chip body 2 is made of a metal (for example, stainless steel) cylinder having a ball 3 rotatably held at its front end. The front end portion of the chip body 2 has an annular inward front end edge portion 4 formed by inward pressure deformation, and a circumferential shape formed by inward pressure deformation at the rear of the front end edge portion 4. Are arranged at equal intervals in a circumferential shape formed by inwardly pressing deformation, which is disposed behind the ball receiving seat 5 and a plurality of inwardly projecting ball receiving seats 5 arranged at equal intervals. A guide portion 6 comprising a plurality of inwardly projecting portions is provided. The ball 3 is held by the front end edge 4 and the ball seat 5 so as to be rotatable and movable back and forth.

ボール受け座用の内方突出部の個数（例えば３個）とガイド部用の内方突出部の設ける個数（例えば３個）は同数である。前記ボール受け座用の内方突出部とガイド部用の内方突出部とは、近接して配置される。前記ボール受け座用の内方突出部の相互間の後方に前記ガイド部用の内方突出部が位置される。 The number of inward protruding portions for the ball seat (for example, 3) and the number of inward protruding portions for the guide portion (for example, 3) are the same. The inward protruding portion for the ball receiving seat and the inward protruding portion for the guide portion are arranged close to each other. The inward protruding portion for the guide portion is located behind the inward protruding portions for the ball receiving seat.

前記ボール受け座用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される。さらに、前記ガイド部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される（図２参照）。図２の２点鎖線は、前記ボール受け座用の内方突出部の頂点に接する仮想内接円、及び前記ガイド部用の内方突出部の頂点に接する仮想内接円を示す。ボール受け座用の内方突出部の前側には、円錐状凹部５２が形成される。 The diameter of the virtual inscribed circle that contacts the apex of the inward protruding portion for the ball receiving seat is set to be larger than the diameter of the rod portion 81. Furthermore, the diameter of the virtual inscribed circle that contacts the apex of the inward protruding portion for the guide portion is set to be larger than the diameter of the rod portion 81 (see FIG. 2). A two-dot chain line in FIG. 2 indicates a virtual inscribed circle that is in contact with the apex of the inward protruding portion for the ball seat and a virtual inscribed circle that is in contact with the apex of the inward protruding portion for the guide portion. A conical recess 52 is formed on the front side of the inward protruding portion for the ball receiving seat.

前記ボール受け座用の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５１が軸方向に貫設される。前記ガイド部用の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６１が軸方向に貫設される。前記ボール受け座用の内方突出部の相互間のインキ流出間隙５１、及び前記ガイド部用の内方突出部の相互間のインキ流出間隙６１にロッド部８１が遊挿される。前記ロッド部８１により、ボール３が前方に付勢され且つボール３が前端縁部４の内面に環状に密接される。 An ink outflow gap 51 extending radially outward from the central portion in the radial direction is provided between the inward protruding portions for the ball receiving seat. An ink outflow gap 61 extending radially outward from the central portion in the radial direction is provided between the inward projecting portions for the guide portion. The rod portion 81 is loosely inserted into the ink outflow gap 51 between the inward protruding portions for the ball receiving seat and the ink outflow gap 61 between the inward protruding portions for the guide portion. The rod portion 81 urges the ball 3 forward, and the ball 3 is in close contact with the inner surface of the front end edge portion 4 in an annular shape.

前記ボール受け座用の内方突出部と前記ガイド部用の内方突出部とを前後に近接して配置させたことにより、ロッド部８１をボール受け座の中心に確実にガイドすることができ、ボール３の中心を安定的に前方に付勢することができる。 By arranging the inward protruding portion for the ball receiving seat and the inward protruding portion for the guide portion close to each other in the front-rear direction, the rod portion 81 can be reliably guided to the center of the ball receiving seat. The center of the ball 3 can be urged forward stably.

前記チップ本体２の中間部内面に、内方への押圧変形により形成した周方向に等間隔に配置される複数の内方突出部からなる第１の変形抑止部７Ａが設けられる。前記第１の変形抑止部用の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７１Ａが軸方向に貫設される。さらに、前記第１の変形抑止部７Ａの後方の、前記チップ本体２の中間部内面に、内方への押圧変形により形成した周方向に等間隔に配置される複数の内方突出部からなる第２の変形抑止部７Ｂが設けられる。前記第２の変形抑止部用の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７１Ｂが軸方向に貫設される。前記第１の変形抑止部７Ａと前記第２の変形抑止部７Ｂとが近接して配置される。また、前記第１の変形抑止部用の内方突出部の相互間の後方に前記第２の変形抑止部用の内方突出部が位置される。 On the inner surface of the intermediate part of the chip body 2, a first deformation restraining part 7 </ b> A composed of a plurality of inwardly projecting parts arranged at equal intervals in the circumferential direction formed by inward pressing deformation is provided. An ink outflow gap 71A extending radially outward from the central portion in the radial direction is provided between the inward projecting portions for the first deformation suppressing portion. Furthermore, it consists of a plurality of inwardly projecting portions arranged at equal intervals in the circumferential direction formed on the inner surface of the intermediate portion of the chip body 2 behind the first deformation inhibiting portion 7A by inward pressing deformation. A second deformation suppression unit 7B is provided. An ink outflow gap 71 </ b> B extending radially outward from the central portion in the radial direction is provided between the inward projecting portions for the second deformation suppressing portion. The first deformation inhibiting part 7A and the second deformation inhibiting part 7B are arranged close to each other. In addition, an inward protruding portion for the second deformation inhibiting portion is located behind the inward protruding portions for the first deformation inhibiting portion.

前記第１の変形抑止部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される。前記第２の変形抑止部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される。前記第１の変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ａ、及び前記第２の変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ｂに前記ロッド部８１が遊挿される（図３参照）。図３の２点鎖線は、前記第１の変形抑止部用の内方突出部の頂点に接する仮想内接円、及び前記第２の変形抑止部用の内方突出部の頂点に接する仮想内接円を示す。 A diameter of a virtual inscribed circle that is in contact with the apex of the inward protruding portion for the first deformation suppressing portion is set to be larger than the diameter of the rod portion 81. A diameter of a virtual inscribed circle that is in contact with the apex of the inward projecting portion for the second deformation suppressing portion is set to be larger than a diameter of the rod portion 81. The rod portion 81 is located in the ink outflow gap 71A between the inward protruding portions for the first deformation inhibiting portion and the ink outflow gap 71B between the inward protruding portions for the second deformation inhibiting portion. It is loosely inserted (see FIG. 3). The two-dot chain line in FIG. 3 indicates a virtual inscribed circle that is in contact with the vertex of the inward protruding portion for the first deformation inhibiting portion, and a virtual interior that is in contact with the vertex of the inwardly protruding portion for the second deformation inhibiting portion. Indicates a tangent circle.

前記スプリング８のロッド部８１が、チップ本体２の後端開口部より前方に挿入され、最初に、第２の変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ｂに遊挿され、次に、第１の変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ａに遊挿され、その後、ガイド部用の内方突出部の相互間のインキ流出間隙６１に遊挿され、そして最後に、ボール受け座用の内方突出部の相互間のインキ流出間隙５１に遊挿される。 The rod portion 81 of the spring 8 is inserted in front of the rear end opening of the chip body 2, and is first loosely inserted into the ink outflow gap 71B between the inward projecting portions for the second deformation suppressing portion. Next, it is loosely inserted into the ink outflow gap 71 </ b> A between the inward protruding portions for the first deformation inhibiting portion, and then loosely inserted into the ink outflow gap 61 between the inward protruding portions for the guide portion. Finally, it is loosely inserted into the ink outflow gap 51 between the inward projections for the ball seat.

前記第１変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ａ、及び前記第２変形抑止部用の内方突出部の相互間のインキ流出間隙７１Ｂに、前記ロッド部８１を遊挿させてなることにより、チップ本体２の中間部において、ロッド部８１の撓み変形を抑止できる。その結果、ロッド部８１前端によってボール３が適正に前方に付勢され、ボール３と前端縁部４内面との確実なシール性が得られる。 The rod portion 81 is allowed to idle in the ink outflow gap 71A between the inward protruding portions for the first deformation inhibiting portion and the ink outflow gap 71B between the inward protruding portions for the second deformation inhibiting portion. By being inserted, bending deformation of the rod portion 81 can be suppressed in the intermediate portion of the chip body 2. As a result, the ball 3 is appropriately biased forward by the front end of the rod portion 81, and a reliable sealing property between the ball 3 and the inner surface of the front end edge portion 4 is obtained.

ボール受け座用の内方突出部の相互間の軸方向後方の延長線上のチップ本体２内面には、ガイド部用の内方突出部が位置し、ガイド部用の内方突出部の相互間の軸方向前方の延長線上のチップ本体２内面には、ボール受け座用の内方突出部が位置する。即ち、前記チップ本体２から仮想的にボール３を除いた状態でチップ本体２の前端開口部からボール受け座用の内方突出部を視認したとき、ボール受け座用の内方突出部の相互間にガイド部用の内方突出部が位置するよう視認される（図２参照）。それにより、ロッド部８１を確実にボール受け座のインキ流出間隙５１の中心部にガイドすることができ、また、筆記時、ロッド部８１がボール受け座のインキ流出間隙５１の中心部に維持され、安定したボール３の回転が得られる。 On the inner surface of the chip body 2 on the axially rearward extension line between the inward projecting portions for the ball receiving seat, an inward projecting portion for the guide portion is located, and between the inward projecting portions for the guide portion An inward protruding portion for a ball receiving seat is located on the inner surface of the chip body 2 on the extension line in the front in the axial direction. That is, when the inward protruding portion for the ball receiving seat is visually recognized from the front end opening of the chip main body 2 with the ball 3 virtually removed from the chip main body 2, the inward protruding portions for the ball receiving seat are mutually connected. It is visually recognized that an inward protruding portion for the guide portion is located between them (see FIG. 2). Thereby, the rod portion 81 can be reliably guided to the center portion of the ink outlet gap 51 of the ball receiving seat, and the rod portion 81 is maintained at the center portion of the ink outlet gap 51 of the ball receiving seat at the time of writing. Stable rotation of the ball 3 is obtained.

また、第１の変形抑止部用の内方突出部の相互間の軸方向後方の延長線上のチップ本体２内面には、第２の変形抑止部用の内方突出部が位置し、第２の変形抑止部用の内方突出部の相互間の軸方向前方の延長線上のチップ本体２内面には、第１の変形抑止部用の内方突出部が位置する。即ち、第１の変形抑止部より前方のチップ本体２の横断面を前方より視認したとき、第１の変形抑止部用の内方突出部の相互間に第２の変形抑止部用の内方突出部が位置するよう視認される（図３参照）。それにより、チップ本体２の中間部において、ロッド部８１の撓み変形を確実に抑止できる。その結果、ロッド部８１前端によってボール３が適正に前方に付勢され、ボール３と前端縁部４内面との確実なシール性が得られる。 In addition, an inner projecting portion for the second deformation inhibiting portion is located on the inner surface of the chip body 2 on the axially rearward extension line between the inward projecting portions for the first deformation inhibiting portion. On the inner surface of the chip body 2 on the extension line in the axial direction between the inward projecting portions for the first deformation restraining portion, the inward projecting portion for the first deformation restraining portion is located. That is, when the cross section of the chip body 2 in front of the first deformation restraining portion is viewed from the front, the inner side of the second deformation restraining portion is located between the inward protruding portions for the first deformation restraining portion. It is visually recognized that the protruding portion is positioned (see FIG. 3). Thereby, bending deformation of the rod part 81 can be reliably suppressed in the intermediate part of the chip body 2. As a result, the ball 3 is appropriately biased forward by the front end of the rod portion 81, and a reliable sealing property between the ball 3 and the inner surface of the front end edge portion 4 is obtained.

＜第２の実施の形態＞
図６乃至図１０に本発明の第２の実施の形態を示す。
本実施の形態のボールペン１は、チップ本体２と、該チップ本体２の後端部を保持するホルダー９と、該ホルダー９の後端部が圧入固着されるインキ収容管１０と、該チップ本体２内及びホルダー９内に収容されるスプリング８と、インキ収容管１０の後端開口部に取り付けられる尾栓１１とからなる。前記インキ収容管１０内には、インキ１０ａと、該インキの消費に伴い前進する追従体１０ｂ（例えば高粘度流体と固形物）とが収容される。 <Second Embodiment>
6 to 10 show a second embodiment of the present invention.
The ballpoint pen 1 of the present embodiment includes a chip body 2, a holder 9 that holds the rear end portion of the chip body 2, an ink storage tube 10 into which the rear end portion of the holder 9 is press-fitted and fixed, and the chip body. 2 and the spring 9 accommodated in the holder 9 and a tail plug 11 attached to the rear end opening of the ink accommodating tube 10. In the ink storage tube 10, ink 10a and a follower 10b (for example, a high-viscosity fluid and a solid) that move forward as the ink is consumed are stored.

前記チップ本体２は、前端にボール３を回転可能に抱持した金属製（例えばステンレス鋼製）の筒体からなる。前記チップ本体２の前端部には、内方への押圧変形により形成した環状の内向きの前端縁部４と、内方への押圧変形により形成した周状に等間隔に配置される複数（例えば４個）の内方突出部よりなるボール受け座５が設けられる。前記前端縁部４とボール受け座５とによって、ボール３が回転可能且つ前後に移動可能に抱持される。 The chip body 2 is made of a metal (for example, stainless steel) cylinder having a ball 3 rotatably held at its front end. At the front end portion of the chip body 2, an annular inward front end edge portion 4 formed by inward pressing deformation and a plurality of (equally spaced) circumferentially formed by inward pressing deformation ( For example, four ball receiving seats 5 having inward protruding portions are provided. The ball 3 is held by the front end edge 4 and the ball seat 5 so as to be rotatable and movable back and forth.

前記ボール受け座用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される（図７参照）。図７の２点鎖線は、ボール受け座用の内方突出部の頂点に接する仮想内接円を示す。 The diameter of the virtual inscribed circle that contacts the apex of the inward protruding portion for the ball receiving seat is set larger than the diameter of the rod portion 81 (see FIG. 7). The dashed-two dotted line of FIG. 7 shows the virtual inscribed circle which touches the vertex of the inward protrusion part for ball seats.

前記ボール受け座用の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５１が軸方向に貫設される。前記ボール受け座用の内方突出部の相互間のインキ流出間隙５１にロッド部８１が遊挿される。前記ロッド部８１により、ボール３が前方に付勢され且つボール３が前端縁部４の内面に環状に密接される。 An ink outflow gap 51 extending radially outward from the central portion in the radial direction is provided between the inward protruding portions for the ball receiving seat. A rod portion 81 is loosely inserted into the ink outflow gap 51 between the inward protruding portions for the ball receiving seat. The rod portion 81 urges the ball 3 forward, and the ball 3 is in close contact with the inner surface of the front end edge portion 4 in an annular shape.

前記チップ本体２の中間部内面に、内方への押圧変形により形成した周方向に等間隔に配置される複数（例えば４個）の内方突出部からなる変形抑止部７が設けられる。前記変形抑止部用の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７１が軸方向に貫設される。前記変形抑止部用の内方突出部の頂点に接する仮想内接円の直径が、前記ロッド部８１の直径より大きく設定される。前記変形抑止部用の内方突出部の相互間のインキ流出間隙７１に前記ロッド部８１が遊挿される。 On the inner surface of the intermediate part of the chip body 2, a deformation inhibiting part 7 composed of a plurality of (for example, four) inwardly projecting parts arranged at equal intervals in the circumferential direction formed by inward pressing deformation is provided. An ink outflow gap 71 that extends radially outward from the central portion in the radial direction is provided between the inward protruding portions for the deformation suppressing portion. The diameter of the virtual inscribed circle that contacts the apex of the inward projecting portion for the deformation suppressing portion is set to be larger than the diameter of the rod portion 81. The rod portion 81 is loosely inserted into the ink outflow gap 71 between the inward protruding portions for the deformation suppressing portion.

前記スプリング８のロッド部８１が、チップ本体２の後端開口部より前方に挿入され、最初に、変形抑止部用の内方突出部の相互間のインキ流出間隙７１に遊挿され、次に、ボール受け座用の内方突出部の相互間のインキ流出間隙５１に遊挿される。 The rod portion 81 of the spring 8 is inserted in front of the rear end opening of the chip body 2, and is first loosely inserted into the ink outflow gap 71 between the inward projecting portions for the deformation suppressing portion, and then Then, it is loosely inserted into the ink outflow gap 51 between the inward projections for the ball receiving seat.

前記変形抑止部用の内方突出部の相互間のインキ流出間隙７１に前記ロッド部８１を遊挿させてなることにより、チップ本体２の中間部において、ロッド部８１の撓み変形を抑止できる。その結果、ロッド部８１前端によってボール３が適正に前方に付勢され、ボール３と前端縁部４内面との確実なシール性が得られる。 By allowing the rod portion 81 to be loosely inserted into the ink outflow gap 71 between the inward protruding portions for the deformation suppressing portion, the bending deformation of the rod portion 81 can be suppressed at the intermediate portion of the chip body 2. As a result, the ball 3 is appropriately biased forward by the front end of the rod portion 81, and a reliable sealing property between the ball 3 and the inner surface of the front end edge portion 4 is obtained.

１ボールペン
２チップ本体
３ボール
４前端縁部
５ボール受け座
５１インキ流出間隙
６ガイド部
６１インキ流出間隙
７変形抑止部
７１インキ流出間隙
７Ａ第１の変形抑止部
７１Ａインキ流出間隙
７Ｂ第２の変形抑止部
７１Ｂインキ流出間隙
８スプリング
８１ロッド部
８２コイル部
９ホルダー
１０インキ収容管
１０ａインキ
１０ｂ追従体
１１尾栓 DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Tip body 3 Ball 4 Front edge part 5 Ball receiving seat 51 Ink outflow gap 6 Guide part 61 Ink outflow gap 7 Deformation suppression part 71 Ink outflow gap 7A First deformation suppression part 71A Ink outflow gap 7B Second deformation Inhibiting portion 71B Ink outflow gap 8 Spring 81 Rod portion 82 Coil portion 9 Holder 10 Ink storage tube 10a Ink 10b Follower 11 Tail plug

Claims

An inward front end edge is provided at the front end of the metal chip body, and a ball receiving seat comprising a plurality of inward protruding parts formed by inward pressing deformation is provided on the inner surface of the chip body behind the front end edge. Ink that extends between the front end edge portion and the ball receiving seat so as to be rotatable, and radially extends radially outward from the central portion between the inward protruding portions for the ball receiving seat. A ballpoint pen that forms an outflow gap and loosely inserts into the ink outflow gap a rod portion that urges the ball forward and brings the ball into close contact with the inner surface of the front edge,
Provided on the inner surface of the intermediate portion of the chip body, a deformation inhibiting portion that comprises a plurality of inwardly projecting portions formed by inward deformation by pressing, and that suppresses bending deformation of the rod portion,
An ink outflow gap extending radially outward from the central portion is formed between the inward protruding portions for the deformation suppressing portion, and an ink outflow gap between the inward protruding portions for the deformation suppressing portion is formed. A ballpoint pen characterized by loosely inserting the rod portion.

A virtual inscribed circle in contact with the apex of the inward protruding portion for the ball receiving seat is set to be larger than the diameter of the rod portion, and the hypothetical inner in contact with the apex of the inward protruding portion for the deformation inhibiting portion The ballpoint pen according to claim 1, wherein a diameter of the tangent circle is set larger than a diameter of the rod portion.

The deformation restraining portion is provided with a first deformation restraining portion comprising a plurality of inwardly projecting portions arranged circumferentially at equal intervals, and provided at the rear of the first deformation restraining portion, at circumferentially equal intervals. Or a second deformation restraining portion comprising a plurality of inwardly projecting portions, wherein the first deformation restraining portion and the second deformation restraining portion are disposed close to each other in the front-rear direction. 2. The ballpoint pen described in 2.

4. The ballpoint pen according to claim 3, wherein an inward protruding portion for the second deformation suppressing portion is located behind the inward protruding portions for the first deformation suppressing portion.

A guide portion composed of a plurality of inward protruding portions formed by inward pressing deformation is provided behind the inward protruding portion for the ball receiving seat, and the inward protruding portion for the ball receiving seat and the guide portion are provided. 5. An inward projecting portion for use is disposed close to the front and rear, and the rod portion is loosely inserted into an ink outflow gap between the inward projecting portions for the guide portion. Ballpoint pen as described in

6. The ballpoint pen according to claim 5, wherein a diameter of a virtual inscribed circle in contact with an apex of the inward protruding portion for the guide portion is set larger than a diameter of the rod portion.

7. The ballpoint pen according to claim 5, wherein an inward protruding portion for the guide portion is located behind the inward protruding portions for the ball receiving seat.