JP2017013297A

JP2017013297A - Ball point pen

Info

Publication number: JP2017013297A
Application number: JP2015130684A
Authority: JP
Inventors: 大屋　誠; Makoto Oya; 誠大屋
Original assignee: Pilot Ink Co Ltd; Pilot Corp
Current assignee: Pilot Ink Co Ltd; Pilot Corp
Priority date: 2015-06-30
Filing date: 2015-06-30
Publication date: 2017-01-19

Abstract

PROBLEM TO BE SOLVED: To provide a ball point pen for inexpensively restraining manufacturing cost by a simple assembly process, without risk of ink leakage by assembly failure, without risk of becoming writing impossibility even in a long-term storage, and capable of facilitating classified waste after use.SOLUTION: A ball point pen comprises a metallic pipe 2 composed of a small diameter cylinder part 3 of a straight cylindrical shape, a taper wall part 4 integrally linked on the rear end of the small diameter cylinder part 3 and expanding a diameter toward the rear and a large diameter cylinder part 5 of a straight cylindrical shape integrally linked on the rear end of the taper wall part 4. An inward front edge part 31 and a plurality of inner projections 32 for a ball receiving seat are integrally formed in a front end part of the small diameter cylinder part 3 by plastic working. A metallic spring 8 is provided in the rear of a ball 33. A spring locking inner projection part 51 is integrally formed on an inner surface of the large diameter cylinder part 5 by the plastic working. An ink storage cylinder part 7 is integrally linked in the rear of the large diameter cylinder part 5.SELECTED DRAWING: Figure 1

Description

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

従来この種のボールペンにおいて、例えば、特許文献１には、ボールペンチップが、直円筒状の小径部と、直円筒状の大径部と、前記小径部と大径部とを接続するテーパ部とを有する金属製パイプからなり、前記小径部の前端部に、前端縁部とボール受け座用の複数の内方突起とが塑性加工により形成され、前端縁部と内方突起とによりボールが回転可能に抱持される構成が開示されている。さらに、特許文献１には、前記ボールペンチップが圧入固着された合成樹脂製のホルダーと、前記ボールを前方に付勢するスプリングが開示されている。 Conventionally, in this type of ballpoint pen, for example, Patent Document 1 discloses that a ballpoint pen tip includes a right cylindrical cylindrical small diameter portion, a straight cylindrical large diameter portion, and a tapered portion that connects the small diameter portion and the large diameter portion. The front end edge portion and a plurality of inward projections for the ball receiving seat are formed by plastic working at the front end portion of the small diameter portion, and the ball is rotated by the front end edge portion and the inward protrusion. A possible embrace configuration is disclosed. Further, Patent Document 1 discloses a synthetic resin holder to which the ballpoint pen tip is press-fitted and fixed, and a spring for biasing the ball forward.

また、特許文献２には、チップ本体のタンク接続部にカシメ部を設け、該カシメ部が、タンク接続部の内面においてスプリングの後端を係止するバネ係止凸部と、その外面において液タンクの内面を係止するタンク係止凹部とを有する構成が開示されている。 In Patent Document 2, a caulking portion is provided in a tank connecting portion of a chip body, and the caulking portion includes a spring locking convex portion that locks the rear end of the spring on the inner surface of the tank connecting portion, and a liquid locking portion on the outer surface. The structure which has the tank latching recessed part which latches the inner surface of a tank is disclosed.

また、特許文献３には、チップ部の先端にボールが設けられたボールペンチップにおいて、前記チップ部は、先端に前記ボールが配置されると共に、前記チップ部の軸線方向に延在する第１のインク流動孔と、前記第１のインク流動孔より大きな径で前記軸線方向に延在する第２のインク流動孔とを有し、前記第１のインク流動孔内には、前記ボールを付勢する螺旋バネが配置され、前記螺旋バネの後端は、前記第１のインク流動孔内で支持される構成が開示されている。 Further, in Patent Document 3, in a ball-point pen tip in which a ball is provided at the tip of the tip part, the tip part is arranged such that the ball is arranged at the tip and the first part extends in the axial direction of the tip part. An ink flow hole, and a second ink flow hole having a larger diameter than the first ink flow hole and extending in the axial direction, and the ball is urged into the first ink flow hole. A configuration is disclosed in which a spiral spring is disposed, and a rear end of the spiral spring is supported in the first ink flow hole.

特開２００９−１４８９６８号公報JP 2009-148968 A 特開平１０−３２９４７５号公報Japanese Patent Laid-Open No. 10-329475 特開２０１０−１２５７８７号公報JP 2010-125787 A

前記特許文献１のボールペンは、合成樹脂製のホルダーを介してボールペンチップとインキ収容筒が接続されている。そのため、ボールペンチップとホルダー、及びホルダーとインキ収容筒の組立工程が必要である。また、前記特許文献１のボールペンは、ボールペンチップとホルダーとの間、及びホルダーとインキ収容筒との間で、組立不良によるインキ漏出が発生するおそれがある。また、前記特許文献１のボールペンは、使用後に廃棄する際、ボールペンチップ、ホルダー、インキ収容筒、及びスプリングを分解し、金属材料と合成樹脂材料とに分別して廃棄する必要があり、分解分別作業が手間である。また、前記特許文献１のボールペンは、長期保管すると、合成樹脂製部材（例えばホルダー、インキ収容筒）の側壁をインキ溶媒蒸気や空気が透過し、インキ蒸発やインキ中に気泡の発生により、筆記不能となるおそれがある。 In the ballpoint pen of Patent Document 1, a ballpoint pen tip and an ink storage cylinder are connected via a synthetic resin holder. Therefore, the assembly process of a ball-point pen tip and a holder and a holder and an ink storage cylinder is required. In addition, the ballpoint pen disclosed in Patent Document 1 may cause ink leakage due to poor assembly between the ballpoint pen tip and the holder and between the holder and the ink storage cylinder. Further, when disposing of the ballpoint pen of Patent Document 1 after use, it is necessary to disassemble the ballpoint pen tip, the holder, the ink containing cylinder, and the spring, separate them into metal materials and synthetic resin materials, and dispose them. Is troublesome. In addition, when the ballpoint pen of Patent Document 1 is stored for a long period of time, ink solvent vapor or air permeates through a side wall of a synthetic resin member (for example, a holder or an ink storage cylinder), and writing occurs due to ink evaporation or generation of bubbles in the ink. May become impossible.

特許文献２は、カシメ部を形成する際、チップ本体のタンク接続部の外面に不用意に傷が付くことがあり、それによりチップ本体とタンクとの組立不良が生じ、タンクと接続部との間からインキを漏出させるおそれがある。また、カシメ部の形成工程において、チップ本体のタンク接続部の外面に傷を付けないようにする工程管理が必要となる。 In Patent Document 2, when the crimped portion is formed, the outer surface of the tank connecting portion of the chip body may be inadvertently damaged, thereby causing an assembly failure between the chip body and the tank. There is a risk of ink leaking from the gap. Further, in the formation process of the crimping portion, it is necessary to manage the process so as not to damage the outer surface of the tank connecting portion of the chip body.

特許文献３は、螺旋バネの後端が第１のインク流動孔内で支持されるため、螺旋バネが微細なものとなり、螺旋バネの製造が及び組立作業が困難となり、製造コストが上昇する。 In Patent Document 3, since the rear end of the spiral spring is supported in the first ink flow hole, the spiral spring becomes fine, and it becomes difficult to manufacture and assemble the spiral spring, which increases the manufacturing cost.

本発明は前記従来の問題点を解決するものであって、簡易な組立工程により製造コストを安価に抑えるとともに、組立不良によるインキ漏出のおそれがなく、さらに長期保管でも筆記不能となるおそれがなく、しかも使用後の分別廃棄が容易とな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-mentioned conventional problems, and keeps the manufacturing cost low by a simple assembly process, there is no risk of ink leakage due to defective assembly, and there is no possibility of being unable to write even after long-term storage. In addition, an object of the present invention is to provide a ballpoint pen that can be easily discarded after use.

尚、本発明において、「前」とはボール側を指し、「後」とはその反対側を指す。 In the present invention, “front” refers to the ball side, and “rear” refers to the opposite side.

本願の第１の発明は、直円筒状の小径筒部３と、該小径筒部３の後端に一体に連設され且つ後方に向かうに従い拡径するテーパ壁部４と、該テーパ壁部４の後端に一体に連設される直円筒状の大径筒部５とからなる金属製パイプ２を備え、前記小径筒部３の前端に塑性加工により内向きの前端縁部３１を形成し、前記前端縁部３１の後方の前記小径筒部３の前端近傍内面に塑性加工によりボール受け座用の複数の内方突起３２を一体に形成し、前記前端縁部３１と前記内方突起３２とによりボール３３を回転可能に抱持し、前記ボール３３の後方に、前記ボール３３を前方に付勢し且つ前記ボール３３を前記前端縁部３１の内面に密接させる金属製のスプリング８を設けたボールペンであって、前記大径筒部５の内面に塑性加工によりスプリング係止用の内方突出部５１を一体に形成し、前記大径筒部５の後方にインキ収容筒部７を一体に連設したことを要件とする。 The first invention of the present application is a straight cylindrical small-diameter cylindrical portion 3, a tapered wall portion 4 integrally connected to the rear end of the small-diameter cylindrical portion 3 and expanding in diameter toward the rear, and the tapered wall portion 4 is provided with a metal pipe 2 composed of a straight cylindrical large-diameter cylindrical portion 5 that is integrally connected to the rear end of 4, and an inward front end edge portion 31 is formed at the front end of the small-diameter cylindrical portion 3 by plastic working. A plurality of inward projections 32 for ball receiving seats are integrally formed by plastic working on the inner surface in the vicinity of the front end of the small-diameter cylindrical portion 3 behind the front end edge portion 31, and the front end edge portion 31 and the inner projection 32, a metal spring 8 that urges the ball 33 forward and closes the ball 33 to the inner surface of the front edge 31. A ballpoint pen provided on the inner surface of the large-diameter cylindrical portion 5 by plastic working. The inward protrusion 51 for grayed locking integrally formed may be a requirement that has been continuously provided an ink accommodating tube portion 7 behind the large-diameter cylindrical portion 5 integrally.

前記第１の発明のボールペン１は、前記大径筒部５の内面に塑性加工によりスプリング係止用の内方突出部５１を一体に形成し、前記大径筒部５の後方にインキ収容筒部７を一体に連設したことにより、従来のボールペンチップ、ホルダー、インキ収容筒を一部品により構成でき、部品数が減少することにより組立工程が簡易となり、製造コストを安価に抑えることができ、また、部品同志の接合部分がないためインキ漏出のおそれがなく、さらに、長期保管でもインキ蒸発やインキ内への空気混入を回避でき、筆記不能となるおそれがなく、しかも、従来の合成樹脂製ホルダーを備えないため、使用後の分別廃棄が容易となる。 In the ballpoint pen 1 according to the first aspect of the present invention, an inward protruding part 51 for locking a spring is integrally formed on the inner surface of the large-diameter cylindrical part 5 by plastic working, and an ink containing cylinder is provided behind the large-diameter cylindrical part 5. Since the unit 7 is continuously provided as a unit, the conventional ballpoint pen tip, holder, and ink storage cylinder can be configured as a single part, and the number of parts can be reduced, simplifying the assembly process and reducing the manufacturing cost. In addition, there is no risk of ink leakage because there is no joint between the components, and furthermore, ink evaporation and air mixing into the ink can be avoided even during long-term storage. Since no holder is provided, it is easy to dispose of waste after use.

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、前記大径筒部５と前記インキ収容筒部７とが同一の外径を有することを要件とする。 2nd invention of this application requires that the said large diameter cylinder part 5 and the said ink accommodating cylinder part 7 have the same outer diameter in the ball-point pen 1 of said 1st invention.

前記第２の発明のボールペン１は、前記大径筒部５と前記インキ収容筒部７とが同一の外径を有することにより、内方突出部５１を有する前記大径筒部５と前記インキ収容筒部７とを同時に形成でき、一層、製造工程を減少させ、製造コストを安価に抑えることができる。 In the ballpoint pen 1 of the second invention, the large-diameter cylindrical portion 5 and the ink having the inward projecting portion 51 are obtained because the large-diameter cylindrical portion 5 and the ink containing cylindrical portion 7 have the same outer diameter. The housing cylinder portion 7 can be formed at the same time, and the manufacturing process can be further reduced and the manufacturing cost can be reduced.

本願の第３の発明のボールペン１は、前記第１の発明のボールペン１において、前記インキ収容筒部７が前記大径筒部５より大きい外径を有することを要件とする。 The ball-point pen 1 of the third invention of the present application is that, in the ball-point pen 1 of the first invention, the ink containing cylinder part 7 has an outer diameter larger than the large-diameter cylinder part 5.

前記第３の発明のボールペン１は、前記インキ収容筒部７が前記大径筒部５より大きい外径を有することにより、インキ収容筒部７のインキ収容量を増加させることができる。 The ballpoint pen 1 according to the third aspect of the present invention can increase the ink storage amount of the ink storage cylinder portion 7 by the ink storage cylinder portion 7 having an outer diameter larger than that of the large diameter cylinder portion 5.

本発明のボールペンによれば、簡易な組立工程により製造コストを安価に抑えるとともに、組立不良によるインキ漏出のおそれがなく、さらに長期保管でも筆記不能となるおそれがなく、しかも使用後の分別廃棄が容易となる。 According to the ballpoint pen of the present invention, the manufacturing cost is kept low by a simple assembly process, there is no risk of ink leakage due to assembly failure, there is no possibility that writing will be impossible even for long-term storage, and separation disposal after use is possible. It becomes easy.

本発明の第１の実施の形態の縦断面図である。It is a longitudinal cross-sectional view of the 1st Embodiment of this invention. 図１及び図３の要部拡大縦断面図である。FIG. 4 is an enlarged vertical sectional view of a main part of FIGS. 1 and 3. 本発明の第２の実施の形態の縦断面図である。It is a longitudinal cross-sectional view of the 2nd Embodiment of this invention.

＜第１の実施の形態＞
図１及び図２に本発明の第１の実施の形態を示す。 <First Embodiment>
1 and 2 show a first embodiment of the present invention.

本実施の形態のボールペン１は、金属製パイプ２からなり、前記金属製パイプ２が、直円筒状の小径筒部３と、該小径筒部３の後端に一体に連設され且つ後方に向かうに従い拡径するテーパ壁部４と、該テーパ壁部４の後端に一体に連設され且つ前記小径筒部３より大きい外径を有する直円筒状の大径筒部５と、前記大径筒部５の後方に一体に連設されるインキ収容筒部７とからなる。 The ballpoint pen 1 according to the present embodiment includes a metal pipe 2, and the metal pipe 2 is integrally connected to a small cylindrical portion 3 having a right cylindrical shape and a rear end of the small diameter cylindrical portion 3, and rearwardly. A tapered wall portion 4 that expands in diameter, a straight cylindrical large-diameter cylindrical portion 5 that is integrally connected to the rear end of the tapered wall portion 4 and has an outer diameter larger than that of the small-diameter cylindrical portion 3, and the large It is composed of an ink containing cylinder portion 7 which is integrally provided continuously behind the diameter cylinder portion 5.

前記金属製パイプ２の金属材料としては、例えばステンレス鋼（具体的にはＳＵＳ３０４、ＳＵＳ３０５、ＳＵＳ３２１等のオーステナイト系ステンレス鋼）が挙げられる。前記金属製パイプ２は、引き抜き加工やスウェージング加工等、塑性加工により得られる。前記金属製パイプ２は全体に略均一肉厚を有する。本実施の形態のボールペン１は、少なくとも、従来のボールペンチップとインキ収容筒を接続するホルダー等の合成樹脂製部材を備えない。尚、本実施の形態のボールペン１は、筆記具の軸筒内に交換可能なレフィルとして採用される場合、金属製パイプ２の後端に、通気孔を備えた合成樹脂製の尾栓を取り付けてもよい。 Examples of the metal material of the metal pipe 2 include stainless steel (specifically, austenitic stainless steel such as SUS304, SUS305, and SUS321). The metal pipe 2 can be obtained by plastic working such as drawing or swaging. The metal pipe 2 has a substantially uniform wall thickness as a whole. The ballpoint pen 1 of the present embodiment does not include at least a synthetic resin member such as a holder for connecting a conventional ballpoint pen tip and an ink containing cylinder. When the ballpoint pen 1 according to the present embodiment is used as a replaceable refill in the shaft of a writing instrument, a synthetic resin tail plug provided with a vent hole is attached to the rear end of the metal pipe 2. Also good.

・小径筒部
前記小径筒部３の前端には、内方へのカシメ加工（塑性加工）により内向きの前端縁部３１が一体に形成される。前記前端縁部３１の後方の前記小径筒部３の前端近傍内面には、内方への押圧変形（塑性加工）によりボール受け座用の複数（例えば４個）の内方突起３２が一体に形成される。前記前端縁部３１内面と前記内方突起３２の前面との間で金属製（例えばステンレス鋼製または超硬合金製）のボール３３が回転可能に抱持される。前記ボール３３は、直径が、０．３ｍｍ〜１．０ｍｍ（好ましくは０．３ｍｍ〜０．５ｍｍ）の範囲のものが採用される。また、本実施の形態では、ボール３３を小径筒部３の前端部に抱持する手段として塑性加工が行われ、切削加工は行われない。そのため、切削加工時の切削屑の発生がなく、材料ロスによる製造コストの増加を抑えることができる。 -Small-diameter cylinder part An inward front edge 31 is integrally formed at the front end of the small-diameter cylinder part 3 by inward caulking (plastic working). A plurality of (for example, four) inward projections 32 for ball receiving seats are integrally formed on the inner surface in the vicinity of the front end of the small-diameter cylindrical portion 3 behind the front end edge portion 31 by inward pressure deformation (plastic processing). It is formed. A metal ball 33 (for example, made of stainless steel or cemented carbide) is rotatably held between the inner surface of the front edge 31 and the front surface of the inward protrusion 32. The balls 33 having a diameter in the range of 0.3 mm to 1.0 mm (preferably 0.3 mm to 0.5 mm) are employed. In the present embodiment, plastic working is performed as means for holding the ball 33 to the front end portion of the small-diameter cylindrical portion 3, and cutting is not performed. Therefore, there is no generation of cutting waste during cutting, and an increase in manufacturing cost due to material loss can be suppressed.

・テーパ壁部
前記テーパ壁部４は、前記小径筒部３と前記大径筒部５との間を円滑に接続し、その内面において、円滑なインキ流通性と、円滑なスプリング挿入性を得る。 Tapered wall portion The tapered wall portion 4 smoothly connects the small-diameter cylindrical portion 3 and the large-diameter cylindrical portion 5, and obtains smooth ink flowability and smooth spring insertion property on the inner surface thereof. .

・大径筒部
前記大径筒部５の内周面には、内方への押圧変形（塑性加工）により、内方突出部５１が形成される。前記内方突出部５１は、例えば、周状に分散配置された複数の点状突起、または周状に連続的に形成された環状突起が挙げられる。前記内方突出部５１の前面により、スプリング８が係止され、前記内方突出部５１とボール３３との間でスプリング８が前後方向に弾発状態で保持される。 -Large-diameter cylinder part On the inner peripheral surface of the large-diameter cylinder part 5, an inward projecting part 51 is formed by inward pressure deformation (plastic processing). Examples of the inward projecting portion 51 include a plurality of point-like projections distributed in a circumferential shape, or an annular projection formed continuously in a circumferential shape. The spring 8 is locked by the front surface of the inward projecting portion 51, and the spring 8 is held in a resilient state in the front-rear direction between the inward projecting portion 51 and the ball 33.

・スプリング
前記スプリング８は、金属線材（例えばステンレス鋼製線材）により得られる圧縮コイルスプリング８である。前記スプリング８は、直線状に軸方向に延びるロッド部８１と、該ロッド部８１の後端に一体に連設されたコイル部８２とからなる。前記コイル部８２の前端部には、隣接する線材同志が密着する密着巻部８２ａが形成される。前記コイル部８２の後端部には、他のコイル部８２より大きい外径を有する、隣接する線材同志が密着する密着巻部８２ｂが形成される。前記コイル部８２後端の密着巻部８２ｂ後端が前記内方突出部５１の前面に係止され、スプリング８の後方への脱落が防止される。前記スプリング８のコイル部８２は、前記大径筒部５の前端部内部に収容され、前記スプリング８のロッド部８１は、前記大径筒部５の前端部内部から前記テーパ壁部４内部及び前記小径筒部３内部に収容される。前記ロッド部８１の前端が、ボール３３後面に当接し、ボール３３を前方に付勢し、ボール３３を前端縁部３１の内面に密接させる。コイル部８２を大径筒部５に収容したことにより、スプリング８のサイズを微細にする必要がなくなり、スプリング８の容易な組み立てが可能となる。前記スプリング８は、金属製パイプ２の後端開口部（インキ収容筒部７の後端開口部）より内部に挿入され、コイル部８２の密着巻部８２ｂが内方突出部５１を後方より前方に乗り越え、コイル部８２の密着巻部８２ｂが内方突出部５１の前面に係止される。 Spring The spring 8 is a compression coil spring 8 obtained from a metal wire (for example, a stainless steel wire). The spring 8 includes a rod portion 81 that extends linearly in the axial direction, and a coil portion 82 that is integrally connected to the rear end of the rod portion 81. At the front end portion of the coil portion 82, a tightly wound portion 82a in which adjacent wires are in close contact with each other is formed. At the rear end portion of the coil portion 82, a tightly wound portion 82b having an outer diameter larger than that of the other coil portions 82 and in contact with adjacent wires is formed. The rear end of the tightly wound portion 82b at the rear end of the coil portion 82 is locked to the front surface of the inward projecting portion 51, and the spring 8 is prevented from falling off backward. The coil portion 82 of the spring 8 is accommodated inside the front end portion of the large-diameter cylindrical portion 5, and the rod portion 81 of the spring 8 extends from the inside of the front end portion of the large-diameter cylindrical portion 5 to the inside of the tapered wall portion 4 and The small diameter cylindrical portion 3 is accommodated inside. The front end of the rod portion 81 abuts on the rear surface of the ball 33, urges the ball 33 forward, and brings the ball 33 into close contact with the inner surface of the front end edge portion 31. By accommodating the coil portion 82 in the large-diameter cylindrical portion 5, it is not necessary to make the size of the spring 8 fine, and the spring 8 can be easily assembled. The spring 8 is inserted into the inside from the rear end opening of the metal pipe 2 (the rear end opening of the ink containing cylinder portion 7), and the tightly wound portion 82b of the coil portion 82 moves the inward protruding portion 51 forward from the rear. The tightly wound portion 82b of the coil portion 82 is locked to the front surface of the inward protruding portion 51.

・インキ収容筒部
前記インキ収容筒部７は直円筒状に形成される。本実施の形態では、前記大径筒部５と前記インキ収容筒部７とは同一外径を有する。 -Ink storage cylinder part The said ink storage cylinder part 7 is formed in a right cylinder shape. In the present embodiment, the large diameter cylindrical portion 5 and the ink containing cylindrical portion 7 have the same outer diameter.

前記インキ収容筒部７（大径筒部５）には、インキ７１と、該インキ７１の消費に伴って前進する高粘度流体からなる追従体７２が充填される。前記インキ７１は、例えば、低粘度の水性または油性インキ、剪断減粘性を有する水性ゲルインキまたは油性ゲルインキ等が挙げられる。前記追従体７２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。前記インキ収容筒部７（大径筒部５）の後端は、開口され、外気と連通される。 The ink containing cylinder part 7 (large diameter cylinder part 5) is filled with ink 71 and a follower 72 made of a high-viscosity fluid that moves forward as the ink 71 is consumed. Examples of the ink 71 include a low-viscosity aqueous or oil-based ink, a water-based gel ink or an oil-based gel ink having shear thinning viscosity, and the like. Examples of the follower 72 include a configuration made of only a high-viscosity fluid, or a configuration in which a solid is contained in a high-viscosity fluid. The rear end of the ink containing cylinder part 7 (large diameter cylinder part 5) is opened and communicated with outside air.

本発明の実施の形態のボールペン１は、前記大径筒部５の内面に塑性加工によりスプリング係止用の内方突出部５１を一体に形成し、前記大径筒部５の後方にインキ収容筒部７を一体に連設したことにより、従来のボールペンチップ、ホルダー、インキ収容筒を一部品により構成でき、部品数が減少することにより組立工程が簡易となり、製造コストを安価に抑えることができ、また、部品同志の接合部分がないためインキ漏出のおそれがなく、さらに、長期保管でもインキ蒸発やインキ内への空気混入を回避でき、筆記不能となるおそれがなく、しかも、従来の合成樹脂製ホルダーを備えないため、使用後の分別廃棄が容易となる。 In the ballpoint pen 1 according to the embodiment of the present invention, an inward protruding portion 51 for locking a spring is integrally formed on the inner surface of the large-diameter cylindrical portion 5 by plastic working, and ink is accommodated behind the large-diameter cylindrical portion 5. By connecting the cylindrical portion 7 integrally, the conventional ball-point pen tip, holder, and ink storage cylinder can be configured with one component, and the assembly process is simplified by reducing the number of components, thereby reducing the manufacturing cost. In addition, there is no risk of ink leakage because there is no joint between the components, and furthermore, even during long-term storage, ink evaporation and air mixing into the ink can be avoided, and there is no risk of being unable to write. Since no resin holder is provided, it is easy to dispose of waste after use.

本実施の形態のボールペン１は、前記大径筒部５と前記インキ収容筒部７が同一の外径を有することにより、内方突出部５１を有する前記大径筒部５と前記インキ収容筒部７とを同時に形成でき、一層、製造工程を減少させ、製造コストを安価に抑えることができる。 The ball-point pen 1 according to the present embodiment includes the large-diameter cylindrical portion 5 having the inward protruding portion 51 and the ink-accommodating cylinder when the large-diameter cylindrical portion 5 and the ink-accommodating cylindrical portion 7 have the same outer diameter. The part 7 can be formed at the same time, and the manufacturing process can be further reduced and the manufacturing cost can be reduced.

＜第２の実施の形態＞
図２及び図３に本発明の第２の実施の形態を示す。 <Second Embodiment>
2 and 3 show a second embodiment of the present invention.

・大径筒部
前記大径筒部５の内周面には、内方への押圧変形（塑性加工）により、内方突出部５１が形成される。前記内方突出部５１は、例えば、周状に分散配置された複数の点状突起、または周状に連続的に形成された環状突起が挙げられる。前記内方突出部５１の前面により、スプリングが係止され、前記内方突出部５１とボール３３との間でスプリングが前後方向に弾発状態で保持される。 -Large-diameter cylinder part On the inner peripheral surface of the large-diameter cylinder part 5, an inward projecting part 51 is formed by inward pressure deformation (plastic processing). Examples of the inward projecting portion 51 include a plurality of point-like projections distributed in a circumferential shape, or an annular projection formed continuously in a circumferential shape. A spring is locked by the front surface of the inward protruding portion 51, and the spring is held in a resilient state in the front-rear direction between the inward protruding portion 51 and the ball 33.

・インキ収容筒部
前記インキ収容筒部７が前記大径筒部５より大きい外径を有する。前記インキ収容筒部７は、前記大径筒部５と連結壁部６を介して一体に連設される。本実施の形態では、前記大径筒部５の後端と前記インキ収容筒部７の前端とが連結壁部６を介して一体に連設される。前記連結壁部６の形状は、例えば、後方に向かうに従い拡径するテーパ状、または軸線に対して垂直状が挙げられる。前記インキ収容筒部７は、例えば、全体が直円筒状、全体がテーパ状、または、複数の直円筒状部分と複数のテーパ状部分とからなる構成が挙げられる。 Ink storage cylinder part The ink storage cylinder part 7 has an outer diameter larger than that of the large diameter cylinder part 5. The ink containing cylinder part 7 is integrally connected via the large diameter cylinder part 5 and the connecting wall part 6. In the present embodiment, the rear end of the large-diameter cylindrical portion 5 and the front end of the ink containing cylindrical portion 7 are integrally connected via the connecting wall portion 6. As for the shape of the said connection wall part 6, the taper shape which diameter-expands as it goes back, or the perpendicular | vertical shape with respect to an axis line is mentioned, for example. For example, the ink containing cylinder portion 7 may be configured as a whole having a right cylindrical shape, a whole having a tapered shape, or a plurality of right cylindrical portions and a plurality of tapered portions.

前記インキ収容筒部７には、インキ７１と、該インキ７１の消費に伴って前進する高粘度流体からなる追従体７２が充填される。前記インキ７１は、例えば、低粘度の水性または油性インキ、剪断減粘性を有する水性ゲルインキまたは油性ゲルインキ等が挙げられる。前記追従体７２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。前記インキ収容筒部７の後端は、開口され、外気と連通される。 The ink containing cylinder portion 7 is filled with an ink 71 and a follower 72 made of a high-viscosity fluid that moves forward as the ink 71 is consumed. Examples of the ink 71 include a low-viscosity aqueous or oil-based ink, a water-based gel ink or an oil-based gel ink having shear thinning viscosity, and the like. Examples of the follower 72 include a configuration made of only a high-viscosity fluid, or a configuration in which a solid is contained in a high-viscosity fluid. The rear end of the ink containing cylinder portion 7 is opened and communicates with the outside air.

本発明の実施の形態のボールペン１は、前記インキ収容筒部７が前記大径筒部５より大きい外径を有することにより、インキ収容筒部７のインキ収容量を増加させることができる。 The ballpoint pen 1 according to the embodiment of the present invention can increase the amount of ink stored in the ink storage cylinder portion 7 when the ink storage cylinder portion 7 has an outer diameter larger than that of the large diameter cylinder portion 5.

１ボールペン
２金属製パイプ
３小径筒部
３１前端縁部
３２内方突起
３３ボール
４テーパ壁部
５大径筒部
５１内方突出部
６連結壁部
７インキ収容筒部
７１インキ
７２追従体
８スプリング
８１ロッド部
８２コイル部
８２ａ密着巻部
８２ｂ密着巻部 DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Metal pipe 3 Small diameter cylinder part 31 Front edge part 32 Inner protrusion 33 Ball | bowl 4 Tapered wall part 5 Large diameter cylinder part 51 Inner protrusion part 6 Connection wall part 7 Ink storage cylinder part 71 Ink 72 Follow-up body 8 Spring 81 Rod part 82 Coil part 82a Closely wound part 82b Closely wound part

Claims

A straight cylindrical small-diameter cylindrical portion, a tapered wall portion integrally connected to the rear end of the small-diameter cylindrical portion and expanding in diameter toward the rear, and a direct connection integrally connected to the rear end of the tapered wall portion Provided with a metal pipe consisting of a cylindrical large-diameter cylinder part,
An inward front end edge portion is formed by plastic working at the front end of the small diameter cylindrical portion, and a plurality of inward projections for a ball receiving seat are formed by plastic working on the inner surface in the vicinity of the front end of the small diameter cylindrical portion behind the front end edge portion. Formed integrally, holding the ball rotatably by the front edge and the inward projection,
A ballpoint pen provided with a metal spring behind the ball to urge the ball forward and to bring the ball into close contact with the inner surface of the front edge,
A ballpoint pen characterized in that an inward protruding portion for locking a spring is integrally formed on the inner surface of the large diameter cylindrical portion by plastic working, and an ink containing cylindrical portion is integrally provided behind the large diameter cylindrical portion. .

The ballpoint pen according to claim 1, wherein the large-diameter cylindrical portion and the ink containing cylindrical portion have the same outer diameter.

The ballpoint pen according to claim 1, wherein the ink containing cylinder portion has an outer diameter larger than that of the large diameter cylinder portion.