JP7394643B2

JP7394643B2 - writing implements

Info

Publication number: JP7394643B2
Application number: JP2020016500A
Authority: JP
Inventors: 巧山脇; 悠真大塚
Original assignee: Zebra Co Ltd
Current assignee: Zebra Co Ltd
Priority date: 2020-02-03
Filing date: 2020-02-03
Publication date: 2023-12-08
Anticipated expiration: 2040-02-03
Also published as: JP2021122987A

Description

本発明は、押子をスライドさせる操作により筆記部を突出させるようにした筆記具に関するものである。 The present invention relates to a writing instrument in which a writing portion is made to protrude by sliding a pusher.

従来、この種の発明には、例えば特許文献１に記載されるように、軸筒と、軸筒内に軸方向へスライド可能に係合するとともに該軸筒の外周面から露出して周方向に複数並ぶ押子と、軸筒内で各押子に接続された筆記芯（リフィール）とを備え、複数の前記押子の何れかをスライドさせる操作により該押子に接続された筆記芯の前端の筆記部を軸筒前端から突出させるようにした筆記具がある。この従来技術によれば、前記押子には、軸筒から径方向外側へ突出して外部に露出した操作部が設けられる。 Conventionally, in this type of invention, as described in Patent Document 1, for example, a shaft cylinder is engaged with the shaft cylinder in a slidable manner in the axial direction, and is exposed from the outer circumferential surface of the shaft cylinder in the circumferential direction. It is equipped with a plurality of pushers arranged in a row, and a writing lead (refill) connected to each pusher within the barrel, and by an operation of sliding any of the plurality of pushers, the writing lead connected to the pusher is refilled. There is a writing instrument in which a writing part at the front end protrudes from the front end of the barrel. According to this prior art, the pusher is provided with an operating portion that protrudes radially outward from the shaft cylinder and is exposed to the outside.

特開２００５－１１１８７６号公報Japanese Patent Application Publication No. 2005-111876

ところで、上記従来技術では、押子の前記操作部が、軸筒の後端部よりも前側に位置する。このため、軸筒を握り親指で前記操作部を操作しようとすると、親指が軸筒の後端部に当接して操作し難い場合がある。
そこで、例えば、押子の前記操作部を軸筒の後端付近まで後方へ延設して、前記操作部に対する操作性を向上することが考えられる。しかしながら、このようにした場合、前記操作部と軸筒との間に、軸筒後方から視認される隙間が形成されて、意匠上の体裁を損ねてしまう。 By the way, in the above-mentioned prior art, the operation section of the pusher is located in front of the rear end of the shaft tube. Therefore, when gripping the barrel and trying to operate the operating section with the thumb, the thumb may come into contact with the rear end of the barrel, making it difficult to operate.
Therefore, for example, it is conceivable to extend the operating section of the pusher rearward to near the rear end of the shaft cylinder to improve the operability of the operating section. However, in this case, a gap is formed between the operating portion and the barrel, which is visible from the rear of the barrel, which impairs the aesthetic appearance.

本発明は、上記課題の少なくとも一部を解決するために、以下の構成を具備するものである。
後端側にクリップ部を有する軸筒と、前記軸筒の周壁に径方向へ挿通されるとともに前記周壁に沿って前後方向へスライド可能な押子と、軸筒内で前記押子に接続された筆記芯とを備え、前記押子を前進させる操作により前記筆記芯がその前端側の筆記部を前記軸筒の前端部から突出させるようにした筆記具において、前記押子が、軸筒内で前記筆記芯に接続された軸筒内進退部と軸筒外に露出した操作部とを有し、前記軸筒と前記操作部の間に、軸筒後方から視認可能な径方向の隙間が形成されるようにした筆記具であって、前記軸筒内進退部の後端側には、規制部が設けられ、前記軸筒の内部には、後退位置にある前記軸筒内進退部の前記規制部に対し後方側から近接又は接触するとともに、後方斜め径内方向へ向かう傾斜面が設けられ、前記押子に径方向外側向きの力が加わった際、前記規制部が前記傾斜面に接触することにより、前記押子の径方向外側への移動を規制することを特徴とする筆記具。 In order to solve at least part of the above problems, the present invention includes the following configuration.
a shaft cylinder having a clip portion on a rear end side; a pusher inserted into a peripheral wall of the shaft cylinder in a radial direction and slidable in a front-rear direction along the peripheral wall; and a pusher connected to the pusher within the shaft cylinder. In the writing instrument, the writing tool is provided with a writing lead which is arranged so that the writing part on the front end side of the writing lead protrudes from the front end of the barrel by an operation of advancing the pusher. It has a reciprocating part within the barrel connected to the writing lead and an operating part exposed outside the barrel, and a radial gap is formed between the barrel and the operating part that is visible from the rear of the barrel. The writing instrument is configured such that a regulating portion is provided on the rear end side of the in-barrel reciprocating portion, and the regulating portion of the in-barrel advancing and retracting portion in the retracted position is provided inside the barrel. An inclined surface is provided that approaches or contacts the part from the rear side and faces diagonally backward and radially inward, and when a force directed outward in the radial direction is applied to the pusher, the regulating part contacts the inclined surface. A writing instrument characterized in that the movement of the pusher radially outward is restricted by this .

本発明は、以上説明したように構成されているので、押子に対する操作性が向上する上、軸筒と押子の操作部との隙間が拡がるのを抑制することができる。 Since the present invention is configured as described above, the operability of the pusher is improved, and the gap between the shaft tube and the operating portion of the pusher can be prevented from widening.

本発明に係る筆記具の一例を示す側面図である。FIG. 1 is a side view showing an example of a writing instrument according to the present invention. 図１における(II)-(II)線に沿う拡大断面図である。FIG. 2 is an enlarged sectional view taken along the line (II)-(II) in FIG. 1. FIG. 同筆記具の後端面拡大図である。It is an enlarged view of the rear end of the same writing instrument. 同筆記具の縦断面図である。It is a longitudinal cross-sectional view of the same writing implement. 同筆記具の要部拡大縦断面図である。It is an enlarged vertical cross-sectional view of the main part of the same writing implement. 前軸と後軸の接続前の状態を示す要部拡大縦断面図である。FIG. 2 is an enlarged longitudinal cross-sectional view of a main part showing a state before the front axle and the rear axle are connected. 後軸の要部拡大縦断面図である。FIG. 3 is an enlarged vertical cross-sectional view of the main part of the rear shaft. 後軸と頭冠の接続前の状態を示す要部拡大斜視図である。FIG. 2 is an enlarged perspective view of a main part showing a state before the rear shaft and the crown are connected. 後軸を図５の(VIII)-(VIII)線に沿う位置で切断した端面図である。6 is an end view of the rear shaft taken along line (VIII)-(VIII) in FIG. 5. FIG. （ａ）は第一及び第二の押子を斜め前方から視た斜視図であり、（ｂ）は同押子を斜め後方から視た斜視図である。(a) is a perspective view of the first and second pushers viewed diagonally from the front, and (b) is a perspective view of the same pushers viewed diagonally from the rear. 第一の押子を示す拡大縦断面図である。It is an enlarged longitudinal cross-sectional view showing the first pusher. 軸筒側の被当接部に第一の押子側の当接部が当接した状態を示す拡大縦断面図である。FIG. 3 is an enlarged vertical cross-sectional view showing a state in which the contact portion on the first pusher side is in contact with the abutted portion on the shaft cylinder side. 第二の押子を示す拡大縦断面図である。FIG. 7 is an enlarged vertical cross-sectional view showing the second pusher. 軸筒側の被当接部に第二の押子側の当接部が当接した状態を示す拡大縦断面図である。FIG. 7 is an enlarged vertical cross-sectional view showing a state in which the abutting portion on the second pusher side is in contact with the abutted portion on the shaft cylinder side. 前進した一つの押子とコイルスプリングの接続部分（偏心突起）を含むように切断した端面図である。FIG. 3 is an end view cut to include a connecting portion (eccentric protrusion) between one advanced pusher and a coil spring. コイルスプリングと押子の接続構造を示す縦断面図であり、（ａ）～（ｃ）はそれぞれ異なる態様を示す。FIG. 3 is a vertical cross-sectional view showing a connection structure between a coil spring and a pusher, and (a) to (c) each show a different aspect. 押子側の規制部と軸筒内部の傾斜面との関係を示す斜視図であり、軸筒は図５の(XVI)-(XVI)線に沿う位置で切断している。FIG. 6 is a perspective view showing the relationship between the restricting part on the pusher side and the inclined surface inside the shaft cylinder, and the shaft cylinder is cut at a position along the line (XVI)-(XVI) in FIG. 5. FIG.

本実施の形態では、以下の特徴を開示している。
第１の特徴は、後端側にクリップ部を有する軸筒と、前記軸筒の周壁に径方向へ挿通されるとともに前記周壁に沿って前後方向へスライド可能な押子と、軸筒内で前記押子に接続された筆記芯とを備え、前記押子を前進させる操作により前記筆記芯がその前端側の筆記部を前記軸筒の前端部から突出させるようにした筆記具において、前記押子が、軸筒内で前記筆記芯に接続された軸筒内進退部と軸筒外に露出した操作部とを有し、前記軸筒と前記操作部の間に、軸筒後方から視認可能な径方向の隙間が形成されるようにした筆記具であって、前記軸筒の内部には、後退位置にある前記軸筒内進退部に対し後方側から近接又は接触するとともに、後方斜め径内方向へ向かう傾斜面が設けられている。（図３、図５、図７及び図１７参照）。 This embodiment discloses the following features.
The first feature is that the shaft cylinder has a clip portion on the rear end side, the pusher is inserted into the peripheral wall of the shaft cylinder in the radial direction and is slidable in the front and rear direction along the peripheral wall, and A writing instrument is provided with a writing core connected to the pusher, and the writing core is configured to cause a writing portion on its front end side to protrude from the front end of the barrel by an operation of advancing the pusher. has an in-barrel reciprocating part connected to the writing lead within the barrel and an operating part exposed outside the barrel, and is provided between the barrel and the operating part and is visible from the rear of the barrel. The writing instrument is configured such that a gap is formed in the radial direction, and the inside of the barrel approaches or contacts the advancing and retracting part within the barrel in the retracted position from the rear side, and also has a gap in the rear diagonal radial direction. There is a slope facing towards. (See Figures 3, 5, 7 and 17).

第２の特徴として、前記操作部は、後方へ延設され、その後端部を、前記軸筒の後端部と略面一に配置している（図１、図４及び図５参照）。 As a second feature, the operating section extends rearward, and its rear end is arranged substantially flush with the rear end of the shaft cylinder (see FIGS. 1, 4, and 5).

第３の特徴は、前記軸筒内進退部の後端側に、前記傾斜面に近接又は接触して、前記押子の径方向外側への移動を規制する規制部が設けられている（図１０及び図１７参照）。 A third feature is that a restriction portion is provided on the rear end side of the forward and backward movement portion in the shaft cylinder, in proximity to or in contact with the inclined surface, and restricting movement of the pusher radially outward (Fig. 10 and FIG. 17).

第４の特徴として、前記軸筒内進退部には、前後方向に対し交差する幅方向の両側へ突出するように、前記規制部が設けられ、前記軸筒の内部には、前記両側の前記規制部に対しそれぞれ後方側から近接又は接触するように、前記傾斜面が二つ設けられている（図１０及び図１７参照）。 As a fourth feature, the restricting portion is provided in the forward/retreating portion within the shaft cylinder so as to protrude to both sides in the width direction intersecting the front-rear direction, and The two inclined surfaces are provided so as to approach or contact the regulating portion from the rear side, respectively (see FIGS. 10 and 17).

＜具体的実施態様＞
次に、上記特徴を有する具体的な実施態様について、図面に基づいて詳細に説明する。
本明細書中、軸筒軸方向とは軸筒の中心線が延設される方向を意味し、軸筒周方向とは軸筒の外周を回る方向を意味する。また、「前」とは、軸筒軸方向の一方側であって筆記部が突出する方向を意味し、「後」とは、前記一方側に対する逆方向側を意味する。
また、軸筒径方向とは軸筒の中心線に直交する軸筒の直径方向を意味し、軸筒径方向外側とは軸筒径方向に沿って軸筒中心から離れる方向を意味し、軸筒径方向内側とは軸筒径方向に沿って軸筒中心に向かう方向を意味する。 <Specific embodiment>
Next, a specific embodiment having the above characteristics will be described in detail based on the drawings.
In this specification, the axial direction of the barrel means the direction in which the center line of the barrel extends, and the circumferential direction of the barrel means the direction around the outer periphery of the barrel. Furthermore, the term "front" refers to one side in the axial direction of the barrel and the direction in which the writing section protrudes, and the term "rear" refers to the side in the opposite direction to the one side.
In addition, the radial direction of the shaft cylinder means the diametric direction of the shaft cylinder perpendicular to the center line of the shaft cylinder, and the outer side of the shaft cylinder in the radial direction means the direction away from the center of the shaft cylinder along the radial direction of the shaft cylinder. The inner side in the radial direction of the cylinder means the direction toward the center of the cylinder along the radial direction of the cylinder.

この筆記具Ａは、前端側にグリップ２０を有する軸筒１０と、軸筒１０の後端に嵌合された頭冠３０と、軸筒１０の周壁に径方向へ挿通されるとともに該周壁に沿って前後方向へスライド可能な第一の押子４０及び第二の押子５０と、軸筒１０内で第一の押子４０及び第二の押子５０にそれぞれ接続された複数の筆記芯６１，６２と、軸筒１０に対し第一の押子４０及び第二の押子５０をそれぞれ後方へ付勢するコイルスプリング６３，６４と、これら複数の筆記芯６１，６２を貫挿し支持する筆記芯支持部材７０とを備え、第一の押子４０及び第二の押子５０を選択的に前進させる操作により、該押子に対応する筆記芯６１（又は６２）がその前端側の筆記部を軸筒１０の前端部から突出させる。 This writing instrument A includes a barrel 10 having a grip 20 on the front end side, a crown 30 fitted to the rear end of the barrel 10, and a shaft that is inserted into the peripheral wall of the barrel 10 in the radial direction and is inserted along the peripheral wall. a first pusher 40 and a second pusher 50 that are slidable in the front-rear direction; and a plurality of writing leads 61 connected to the first pusher 40 and the second pusher 50, respectively, within the shaft tube 10. , 62, coil springs 63, 64 that urge the first pusher 40 and the second pusher 50 rearward, respectively, with respect to the barrel 10, and a writing device that inserts and supports the plurality of writing leads 61, 62. By the operation of selectively advancing the first pusher 40 and the second pusher 50, the writing lead 61 (or 62) corresponding to the pusher moves to the writing portion on the front end side. protrudes from the front end of the shaft tube 10.

軸筒１０は、略円筒状の前軸１１と、この前軸１１の後端側に螺合接続されて後方へ延設された後軸１２とから構成される。 The shaft cylinder 10 includes a substantially cylindrical front shaft 11 and a rear shaft 12 that is threadedly connected to the rear end side of the front shaft 11 and extends rearward.

前軸１１は、硬質合成樹脂材料から略円筒状に形成され、その前端側に、先口部１１ａを有する。先口部１１ａは、前端を開口した先細筒状に形成される。 The front shaft 11 is made of a hard synthetic resin material and has a substantially cylindrical shape, and has a tip portion 11a at its front end. The tip portion 11a is formed into a tapered cylindrical shape with an open front end.

図示例によれば、この先口部１１ａの外周部には、装飾等のためのカバー部材１１ｂが装着される。このカバー部材１１ｂは、先口部１１ａに沿う先細筒状に形成され、先口部１１ａの外周部に嵌合等により接続される。なお、他例としては、このカバー部材１１ｂを省くことも可能である。 According to the illustrated example, a cover member 11b for decoration or the like is attached to the outer periphery of the tip portion 11a. This cover member 11b is formed into a tapered cylindrical shape along the tip portion 11a, and is connected to the outer peripheral portion of the tip portion 11a by fitting or the like. In addition, as another example, it is also possible to omit this cover member 11b.

また、前軸１１における先口部１１ａよりも後側には環状凸部１１ｅが設けられ、この環状凸部１１ｅよりも後側に、グリップ２０を装着するためのグリップ装着部１１ｃが略円筒状に設けられる。
そして、グリップ装着部１１ｃの後端側には、径方向外側へ突出する環状突起１１ｃ１が設けられる。 Further, an annular convex portion 11e is provided on the rear side of the tip portion 11a of the front shaft 11, and a grip attachment portion 11c for attaching the grip 20 is provided in a substantially cylindrical shape on the rear side of the annular convex portion 11e. established in
An annular projection 11c1 projecting radially outward is provided on the rear end side of the grip mounting portion 11c.

環状突起１１ｃ１は、その外周部が、後方へ向かって徐々に拡径する傾斜面状に形成される。この環状突起１１ｃ１の後端は、後軸１２の前端部に当接する被押圧面１１ｃ２として機能する。 The annular projection 11c1 has an outer circumferential portion formed in the shape of an inclined surface whose diameter gradually increases toward the rear. The rear end of this annular projection 11c1 functions as a pressed surface 11c2 that comes into contact with the front end of the rear shaft 12.

被押圧面１１ｃ２は、軸筒中心線に対し略直交する環状の面であり、グリップ２０の後端と略面一になるように形成される。 The pressed surface 11c2 is an annular surface substantially perpendicular to the center line of the barrel, and is formed to be substantially flush with the rear end of the grip 20.

そして、前軸１１における被押圧面１１ｃ２よりも後側には、後軸１２に螺合接続するための雄ネジ部１１ｄが設けられる。 A male screw portion 11d for threading connection to the rear shaft 12 is provided on the rear side of the pressed surface 11c2 of the front shaft 11.

また、グリップ２０は、弾性材料から略円筒状に形成され、環状突起１１ｃ１を含むようにして前軸１１の外周のグリップ装着部１１ｃ全体を覆っている。
このグリップ２０は、二色成形によって、前軸１１の外周部に対し、軸方向にわたって一体化されている。
なお、他例としては、弾性材料からなる別体のグリップ２０を前軸１１の外周部に重ね合わせるようにして嵌合した構成とすることも可能である。 Further, the grip 20 is formed of an elastic material into a substantially cylindrical shape, and covers the entire grip mounting portion 11c on the outer periphery of the front shaft 11, including an annular projection 11c1.
This grip 20 is integrated with the outer peripheral portion of the front shaft 11 in the axial direction by two-color molding.
In addition, as another example, it is also possible to adopt a configuration in which a separate grip 20 made of an elastic material is fitted onto the outer peripheral portion of the front shaft 11 in an overlapping manner.

グリップ２０の後端側は、環状突起１１ｃ１の傾斜面状の外周部に沿って後方へゆくにしたがって徐々に肉薄になっている。 The rear end side of the grip 20 gradually becomes thinner toward the rear along the sloped outer circumferential portion of the annular projection 11c1.

後軸１２は、硬質合成樹脂材料から、後端側にクリップ部１２ｂを有する略円筒状に成形される。この後軸１２は、前端側の内周面の雌ネジ部１２ａを、前軸１１後端側の雄ネジ部１１ｄに螺合するようにして、前軸１１の後方側に同軸状に接続される。 The rear shaft 12 is formed from a hard synthetic resin material into a substantially cylindrical shape having a clip portion 12b on the rear end side. This rear shaft 12 is coaxially connected to the rear side of the front shaft 11 by screwing a female threaded portion 12a on the inner peripheral surface of the front end side into a male threaded portion 11d on the rear end side of the front shaft 11. Ru.

後軸１２の周壁の前端側には、前軸１１側の被押圧面１１ｃ２とグリップ２０の後端との両方に対し接触する押圧面１２ｃが設けられる。この押圧面１２ｃは、図示例によれば、円筒状の後軸１２の前端部であり、軸筒中心線に対し略直交する環状の面である。
前軸１１側の被押圧面１１ｃ２と、後軸１２側の押圧面１２ｃとは、前軸１１側の雄ネジ部１１ｄに対する後軸１２側の雌ネジ部１２ａの締め付けにより、圧接される。 A pressing surface 12c that contacts both the pressed surface 11c2 on the front shaft 11 side and the rear end of the grip 20 is provided on the front end side of the peripheral wall of the rear shaft 12. According to the illustrated example, this pressing surface 12c is the front end of the cylindrical rear shaft 12, and is an annular surface substantially orthogonal to the center line of the shaft cylinder.
The pressed surface 11c2 on the front shaft 11 side and the pressing surface 12c on the rear shaft 12 side are pressed together by tightening the female threaded portion 12a on the rear shaft 12 side against the male threaded portion 11d on the front shaft 11 side.

後軸１２の前端部の外径は、グリップ２０の後端部の外径と略同径である。すなわち、後軸１２の外周面とグリップ２０の外周面は、前後方向において略面一である。 The outer diameter of the front end of the rear shaft 12 is approximately the same as the outer diameter of the rear end of the grip 20. That is, the outer circumferential surface of the rear shaft 12 and the outer circumferential surface of the grip 20 are substantially flush with each other in the front-rear direction.

後軸１２の周壁には、第一の押子４０と第二の押子５０を径方向に挿通するとともに前後方向へ導くガイド孔１２ｄ，１２ｅが設けられる。 The peripheral wall of the rear shaft 12 is provided with guide holes 12d and 12e through which the first pusher 40 and the second pusher 50 are inserted in the radial direction and guided in the front-rear direction.

一方のガイド孔１２ｄは、第一の押子４０に対応して複数（図示例によれば二つ）設けられる。各ガイド孔１２ｄは、前後方向へわたる長孔状に形成される。
このガイド孔１２ｄの内縁には、前後方向へわたるガイド面（図示せず）と、このガイド面の前端側で軸筒径方向内側へ凹んだ係止部（図示せず）とが設けられる。第一の押子４０は、前記ガイド面に沿って前方へ移動し、軸筒径方向内側へ沈み込むようにして前記係止部に係止される。 One guide hole 12d is provided in plurality (according to the illustrated example, two) corresponding to the first pusher 40. Each guide hole 12d is formed in a long hole shape extending in the front-rear direction.
The inner edge of the guide hole 12d is provided with a guide surface (not shown) extending in the front-rear direction and a locking portion (not shown) recessed inward in the radial direction of the shaft cylinder at the front end side of the guide surface. The first pusher 40 moves forward along the guide surface, sinks inward in the radial direction of the shaft cylinder, and is locked by the locking portion.

他方のガイド孔１２ｅは、第二の押子５０に対応して単数設けられる。このガイド孔１２ｅは、軸筒１０の周壁を前後方向にわたる長尺状に貫通しており、その周壁における径方向外側の部分を、第二の押子５０の操作部５２を嵌め合わせるように、幅広に形成している（図２参照）。 A single guide hole 12e on the other side is provided corresponding to the second pusher 50. The guide hole 12e extends through the circumferential wall of the shaft cylinder 10 in an elongated shape extending in the front-rear direction, and the operating portion 52 of the second pusher 50 is fitted into the radially outer portion of the circumferential wall. It is formed wide (see Figure 2).

後軸１２内の後端側には、後退した際の第一の押子４０又は第二の押子５０によって当接される被当接部１２ｈ（図１２及び図１４参照）が設けられる。
この被当接部１２ｈは、軸筒中心線に略直交する面である。 A contact portion 12h (see FIGS. 12 and 14) is provided on the rear end side of the rear shaft 12 and is contacted by the first pusher 40 or the second pusher 50 when the pusher is moved backward.
This abutted portion 12h is a surface substantially perpendicular to the center line of the shaft cylinder.

後軸１２の周壁の後端側には、ガイド孔１２ｅの後端側に連通するとともに後方へ開口するように切欠部１２ｅ１が設けられる（図８参照）。この切欠部１２ｅ１には、第二の押子５０の操作部５２が嵌り合う。 A notch 12e1 is provided on the rear end side of the peripheral wall of the rear shaft 12 so as to communicate with the rear end side of the guide hole 12e and open rearward (see FIG. 8). The operating portion 52 of the second pusher 50 fits into this notch 12e1.

また、ガイド孔１２ｅ内には、軸筒周方向の両側にそれぞれ位置するように、前後方向へわたる二つのガイド片部１２ｆが設けられる（図７～図８参照）。 Furthermore, two guide pieces 12f extending in the front-rear direction are provided in the guide hole 12e so as to be located on both sides in the circumferential direction of the shaft cylinder (see FIGS. 7 and 8).

各ガイド片部１２ｆは、軸筒径方向外側に前後方向へわたるガイド面１２ｆ１を有し、このガイド面１２ｆ１の前端側に、軸筒径方向内側へ凹んだ係止部１２ｆ２を有する（図７参照）。第二の押子５０は、ガイド面１２ｆ１に沿って前方へ移動し、軸筒径方向内側へ沈み込むようにして係止部１２ｆ２に係止される。 Each guide piece portion 12f has a guide surface 12f1 extending in the front-rear direction on the outside in the radial direction of the shaft cylinder, and has a locking portion 12f2 recessed inward in the radial direction of the shaft cylinder on the front end side of this guide surface 12f1 (FIG. 7 reference). The second pusher 50 moves forward along the guide surface 12f1, sinks inward in the radial direction of the shaft cylinder, and is locked by the locking portion 12f2.

また、各ガイド片部１２ｆは、軸筒１０内にて径内方向を向く内面を、前後方向へ延設しており、その内面の後端側に、後方斜め径内方向へ向かう傾斜面１２ｆ３を有する（図７参照）。この傾斜面１２ｆ３は、第二の押子５０の軸筒内進退部５１を間に置くようにして、その両側に二つ設けられる（図１７参照）。 Further, each guide piece portion 12f has an inner surface facing radially inward within the shaft tube 10 extending in the front-back direction, and an inclined surface 12f3 facing diagonally rearward and radially inward on the rear end side of the inner surface. (See Figure 7). Two inclined surfaces 12f3 are provided on both sides of the second pusher 50, with the in-cylinder advancing/retreating portion 51 interposed therebetween (see FIG. 17).

この傾斜面１２ｆ３は、後退位置にある第二の押子５０における軸筒内進退部５１の規制部５１ｇに対し後方側から近接又は接触する（図５参照）。
このため、第二の押子５０の後端側が軸筒径外方向へ撓んで、第二の押子５０の操作部５２の後端部と頭冠３０との間の隙間ｓ１（図３参照）が拡大するのを阻むことができる。 This inclined surface 12f3 approaches or contacts from the rear side the regulating portion 51g of the in-cylinder advancing/retreating portion 51 of the second pusher 50 in the retracted position (see FIG. 5).
Therefore, the rear end side of the second pusher 50 is bent in the radially outward direction of the shaft cylinder, and the gap s1 between the rear end of the operating section 52 of the second pusher 50 and the crown 30 (see FIG. 3). ) can be prevented from expanding.

また、後軸１２の後端部には、後方を開口した凹状部１２ｇが設けられ、この凹状部１２ｇに、頭冠３０が嵌め合わせられている（図８参照）。 Further, the rear end of the rear shaft 12 is provided with a concave portion 12g that is open at the rear, and a crown 30 is fitted into this concave portion 12g (see FIG. 8).

凹状部１２ｇは、軸筒中心線に交差する底部１２ｇ１と、底部１２ｇ１の周縁側から後方へ突出する周縁側壁部１２ｇ２と、底部１２ｇ１から後方へ突出した突片部１２ｇ３とを有する。 The concave portion 12g has a bottom portion 12g1 that intersects with the cylinder centerline, a peripheral side wall portion 12g2 that projects rearward from the peripheral side of the bottom portion 12g1, and a projecting piece portion 12g3 that projects rearward from the bottom portion 12g1.

周縁側壁部１２ｇ２は、その周方向の一部分に、上述した切欠部１２ｅ１を有する。また、周縁側壁部１２ｇ２の内壁面には、軸筒径方向内側へ突出する被嵌合突起１２ｇ４が設けられる（図８参照）。 The peripheral side wall portion 12g2 has the above-mentioned cutout portion 12e1 in a portion thereof in the circumferential direction. Moreover, a fitting protrusion 12g4 that protrudes inward in the radial direction of the shaft cylinder is provided on the inner wall surface of the peripheral side wall portion 12g2 (see FIG. 8).

切欠部１２ｅ１には、第二の押子５０の操作部５２が嵌り合う。
詳細に説明すれば、当該筆記具Ａは、後方から視て楕円状に構成され、その楕円における長軸方向の一端側に、切欠部１２ｅ１を配置し、この切欠部１２ｅ１に操作部５２を嵌め合わせている。 The operating portion 52 of the second pusher 50 fits into the notch 12e1.
To explain in detail, the writing instrument A has an elliptical shape when viewed from the rear, and a notch 12e1 is disposed at one end of the ellipse in the major axis direction, and the operating portion 52 is fitted into the notch 12e1. ing.

突片部１２ｇ３は、切欠部１２ｅ１の近傍において切欠部１２ｅ１よりも軸筒内部空間側に位置する。この突片部１２ｇ３は、底部１２ｇ１から後方へ突出するとともに、周縁側壁部１２ｇ２の内面に対し略直交する方向へ板状に延設され、その延設方向の両端部各々と周縁側壁部１２ｇ２の内面との間に隙間ｓ２を有する（図８及び図９参照）。 The projecting piece 12g3 is located near the notch 12e1 and closer to the shaft cylinder internal space than the notch 12e1. The projecting piece 12g3 projects rearward from the bottom 12g1 and extends in a plate shape in a direction substantially orthogonal to the inner surface of the peripheral side wall 12g2, and extends from both ends of the peripheral side wall 12g2 in the extending direction. It has a gap s2 between it and the inner surface (see FIGS. 8 and 9).

被嵌合突起１２ｇ４は、略半楕円状の周縁側壁部１２ｇ２における短軸方向の一端側と他端側にそれぞれ設けられる（図８参照）。
各被嵌合突起１２ｇ４は、頭冠３０の乗り越え嵌合突起３２ａを乗り越え嵌合可能な山形に形成される。 The fitting protrusions 12g4 are provided at one end and the other end in the short axis direction of the substantially semi-elliptical peripheral side wall 12g2 (see FIG. 8).
Each fitting protrusion 12g4 is formed in a chevron shape that can be fitted over the fitting protrusion 32a of the crown 30.

頭冠３０は、凹状部１２ｇの開口縁を塞ぐ後端板部３１と、後端板部３１の内面から凹状部１２ｇ側へ突出して周縁側壁部１２ｇ２及び突片部１２ｇ３の軸筒径方向内側に嵌り合う嵌合部３２と、突片部１２ｇ３の軸筒径方向外側で切欠部１２ｅ１を塞ぐ閉塞片部３３とを一体に有する（図５参照）。 The crown 30 includes a rear end plate portion 31 that closes the opening edge of the recessed portion 12g, and a rear end plate portion 31 that protrudes from the inner surface of the rear end plate portion 31 toward the recessed portion 12g side and is located inside the peripheral side wall portion 12g2 and the projecting piece portion 12g3 in the radial direction of the shaft cylinder. It integrally includes a fitting part 32 that fits into the projection part 12g3, and a closing piece part 33 that closes the notch part 12e1 on the outside in the radial direction of the shaft cylinder of the projecting piece part 12g3 (see FIG. 5).

嵌合部３２は、周縁側壁部１２ｇ２及び突片部１２ｇ３の内側面に嵌り合う筒状に形成される（図５参照）。この嵌合部３２の外側面には、周縁側壁部１２ｇ２の両側の被嵌合突起１２ｇ４に対し、軸筒前方へ乗り超えるようにして嵌り合う乗り越え嵌合突起３２ａ（図８参照）が設けられる。 The fitting part 32 is formed into a cylindrical shape that fits into the inner surfaces of the peripheral side wall part 12g2 and the protrusion part 12g3 (see FIG. 5). The outer surface of the fitting portion 32 is provided with a fitting projection 32a (see FIG. 8) that fits over the fitting projections 12g4 on both sides of the peripheral side wall portion 12g2 so as to ride over the shaft cylinder forward. .

また、第一の押子４０及び第二の押子５０は、軸筒１０後端側において、周方向に間隔をおいて複数設けられる。図示例によれば、第一の押子４０は二つ設けられ、第二の押子５０は単数設けられる。 Further, a plurality of first pushers 40 and second pushers 50 are provided at intervals in the circumferential direction on the rear end side of the shaft tube 10. According to the illustrated example, two first pushers 40 are provided, and one second pusher 50 is provided.

第一の押子４０は、硬質合成樹脂材料からなる硬質部４０ａと、この硬質部４０ａよりも軟質な弾性樹脂材料からなる弾性部４０ｂとを二色成形によって形成してなり、軸筒１０内で筆記芯６１に接続される軸筒内進退部４１と、軸筒１０外に露出する操作部４２とを一体に具備している（図１０及び図１１参照）。 The first pusher 40 is formed by two-color molding of a hard part 40a made of a hard synthetic resin material and an elastic part 40b made of an elastic resin material softer than the hard part 40a. It integrally includes an in-barrel reciprocating part 41 connected to the writing lead 61 and an operating part 42 exposed outside the barrel 10 (see FIGS. 10 and 11).

軸筒内進退部４１は、前後方向へわたる長尺棒状に形成され、後端側の当接部４１ｅ等を除く大部分が、硬質部４０ａにより形成される（図１１参照）。
この軸筒内進退部４１の前端側には、筆記芯６１に対し後方側から圧入接続される筆記芯接続部４１ａと、コイルスプリング６３に対し後方側から挿入されるコイル接続部４１ｂとが設けられる。 The in-cylinder reciprocating portion 41 is formed in the shape of a long bar extending in the front-rear direction, and most of it except for the abutment portion 41e on the rear end side is formed by a hard portion 40a (see FIG. 11).
A writing lead connecting part 41a that is press-fitted and connected to the writing lead 61 from the rear side, and a coil connecting part 41b that is inserted to the coil spring 63 from the rear side are provided on the front end side of this in-cylinder reciprocating part 41. It will be done.

コイル接続部４１ｂは、略円柱軸状に形成され、その外周面に、周方向において部分的に軸筒径方向外側へ突出する偏心突起４１ｂ１を有し、さらに、この偏心突起４１ｂ１よりも後側にコイルスプリング６３の後端部を受けるコイル受け部４１ｂ２を有する（図１０及び図１１参照）。 The coil connecting portion 41b is formed into a substantially cylindrical shaft shape, and has an eccentric protrusion 41b1 on its outer circumferential surface that partially protrudes outward in the radial direction of the shaft cylinder in the circumferential direction. It has a coil receiving portion 41b2 for receiving the rear end portion of the coil spring 63 (see FIGS. 10 and 11).

偏心突起４１ｂ１は、コイルスプリング６３の内周面に、周方向において部分的に圧接することで、コイルスプリング６３の後端側を、第一の押子４０の中心線に対し軸筒径方向外側へ偏心させる（図１５及び図１６（ａ）参照）。 The eccentric protrusion 41b1 partially presses against the inner circumferential surface of the coil spring 63 in the circumferential direction, thereby moving the rear end side of the coil spring 63 outward in the radial direction of the shaft cylinder with respect to the center line of the first pusher 40. (See FIGS. 15 and 16(a)).

コイル受け部４１ｂ２は、軸筒径方向の外側部分４１ｂ２１が、同径方向の内側部分４１ｂ２２よりも後方に位置する段状に形成され、この段状の面を、コイルスプリング６３の後端部に当接させることで、コイルスプリング６３の前側を軸筒径方向外側へ傾斜させる（図１６（ａ）参照）。 The coil receiving portion 41b2 is formed in a step shape such that an outer portion 41b21 in the radial direction of the shaft cylinder is located rearward than an inner portion 41b22 in the same radial direction, and this stepped surface is connected to the rear end portion of the coil spring 63. By bringing them into contact, the front side of the coil spring 63 is inclined outward in the radial direction of the shaft cylinder (see FIG. 16(a)).

なお、コイル受け部４１ｂ２の他例としては、図１６（ｂ）に示すコイル受け部４１ｂ２’や、図１６（ｃ）に示すコイル受け部４１ｂ２”のように、少なくともその受け面の一部を、後方斜め径方向外側へ向かう傾斜面状に形成してもよい。 Other examples of the coil receiving part 41b2 include a coil receiving part 41b2' shown in FIG. 16(b) and a coil receiving part 41b2'' shown in FIG. , it may be formed in the shape of an inclined surface that faces obliquely rearward and outward in the radial direction.

詳細に説明すれば、前記他例のコイル受け部４１ｂ２’は、径方向の外側寄りに、軸筒径方向外側へ向かう部分的な傾斜面を有する（図１６（ｂ）参照）。
さらに、他の一例であるコイル受け部４１ｂ２”は、径方向の全域にわたって後方斜め軸筒径方向外側へ向かう傾斜面を有する（図１６（ｃ）参照）。
これらコイル受け部４１ｂ２’，４１ｂ”によれば、何れも、コイルスプリング６３の前側を軸筒径方向外側へ傾斜させて、他のコイルスプリングに干渉するのを軽減することができる。 To explain in detail, the coil receiving portion 41b2' of the other example has a partial inclined surface toward the outer side in the radial direction of the shaft cylinder (see FIG. 16(b)).
Furthermore, the coil receiving portion 41b2'', which is another example, has an inclined surface extending outward in the rear oblique shaft cylinder radial direction over the entire radial area (see FIG. 16(c)).
According to these coil receiving portions 41b2' and 41b'', the front side of the coil spring 63 can be inclined outward in the radial direction of the shaft cylinder, thereby reducing interference with other coil springs.

また、軸筒内進退部４１の後部側には、軸筒径方向内側へ突出する二つの係合突起４１ｃ，４１ｄが、前後方向に間隔を置いて設けられる（図１０及び図１１参照）。
前側の係合突起４１ｃは、先に他の押子が前進して掛止されている場合に、この押子の後側の係合突起に当接して、その掛止状態を解除する。
後側の係合突起４１ｄは、当該第一の押子４０が先に前進して掛止されており、その掛止状態を解除する場合、後から前進する押子の前側の係合突起に当接される。 Further, on the rear side of the in-cylinder reciprocating portion 41, two engaging protrusions 41c and 41d that protrude inward in the radial direction of the shaft cylinder are provided at intervals in the front-rear direction (see FIGS. 10 and 11).
When another pusher moves forward and is latched first, the front engagement protrusion 41c comes into contact with the rear engagement protrusion of this pusher to release the latching state.
The first pusher 40 moves forward first and is latched to the rear engagement protrusion 41d. When releasing the latching state, the rear engagement protrusion 41d is engaged with the front engagement protrusion of the pusher that advances later. be touched.

また、軸筒内進退部４１の最後端部には、軸筒１０内の被当接部１２ｈに当接するように、当接部４１ｅが後方向きに突設している（図１０及び図１２参照）。
この当接部４１ｅは、操作部４２を形成する弾性部４０ｂによって形成される。すなわち、操作部４２と当接部４１ｅは、弾性部４０ｂを構成する弾性材料により連続するように形成されている。 Furthermore, a contact portion 41e is provided at the rearmost end of the in-cylinder advancing/retreating portion 41 to protrude rearward so as to contact the abutted portion 12h in the shaft tube 10 (FIGS. 10 and 12). reference).
This contact portion 41e is formed by the elastic portion 40b that forms the operating portion 42. That is, the operating portion 42 and the contact portion 41e are formed continuously from an elastic material that constitutes the elastic portion 40b.

この当接部４１ｅの突端面は、図１２に示すように、被当接部１２ｈを構成する面に対し傾斜する傾斜面状に形成される。
この構成によれば、第一の押子４０を被当接部１２ｈに当接させる際、傾斜面状の当接部４１ｅが、徐々に被当接部１２ｈに圧接され変形するため、その際の衝撃（当接音や振動等）を効果的に軽減することができる。
なお、図１０中、符号４１ｆは、ガイド孔１２ｄ内のガイド面（図示せず）の前端側で軸筒径方向内側へ凹んだ係止部（図示せず）に対し掛止される掛止突起である。 As shown in FIG. 12, the protruding end surface of the abutting portion 41e is formed into an inclined surface shape that is inclined with respect to the surface constituting the abutted portion 12h.
According to this configuration, when the first pusher 40 is brought into contact with the abutted part 12h, the inclined surface-shaped abutting part 41e is gradually pressed against the abutted part 12h and deformed. impact (contact noise, vibration, etc.) can be effectively reduced.
In addition, in FIG. 10, the reference numeral 41f is a latch that is latched to a locking part (not shown) that is recessed inward in the radial direction of the shaft cylinder at the front end side of the guide surface (not shown) in the guide hole 12d. It is a protrusion.

また、操作部４２は、軸筒内進退部４１の後端側から軸筒径方向外側へ突出し、ガイド孔１２ｄに対し軸筒内側から挿通されて、軸筒外に露出する。この操作部４２は、軸筒外に露出する部分が弾性部４０ｂによって形成される（図１０及び図１１参照）。 Further, the operating portion 42 protrudes outward in the radial direction of the shaft cylinder from the rear end side of the intra-cylinder advancing/retreating portion 41, is inserted into the guide hole 12d from the inside of the shaft cylinder, and is exposed to the outside of the shaft cylinder. The portion of the operating portion 42 that is exposed outside the shaft cylinder is formed by an elastic portion 40b (see FIGS. 10 and 11).

弾性部４０ｂは、軸筒内進退部４１後端側の当接部４１ｅまで連続しており、第一の押子４０操作時の滑り止めとしての機能と、第一の押子４０後退時の緩衝材としての機能とを併せ持つ。 The elastic portion 40b is continuous to the abutment portion 41e on the rear end side of the in-cylinder advance/retreat portion 41, and functions as an anti-slip when the first pusher 40 is operated and as a stopper when the first pusher 40 is retracted. It also functions as a cushioning material.

そして、上記構成の第一の押子４０は、硬質部４０ａを軸筒１０のガイド孔１２ｄ内面に摺接させて前後方向へスライドするとともに、この摺接箇所から弾性部４０ｂを離隔している。
詳細に説明すれば、図２の横断面に示すように、硬質部４０ａは、ガイド孔１２ｄの内面に対し近接又は摺接するように形成される。これに対し、弾性部４０ｂは、硬質部４０ａから段状に幅を狭めて、ガイド孔１２ｄの内面から離隔するように形成される。
この構成によれば、第一の押子４０を前後方向へスライドさせる際に、弾性部４０ｂが軸筒１０に摺接するのを阻んで、硬質部４０ａのみをガイド孔１２ｄ内面に摺接させることができる。このため、第一の押子４０のスライド動作性が良好である。 The first pusher 40 configured as described above slides in the front-rear direction with the hard part 40a in sliding contact with the inner surface of the guide hole 12d of the shaft tube 10, and the elastic part 40b is separated from this sliding contact point. .
More specifically, as shown in the cross section of FIG. 2, the hard portion 40a is formed so as to be close to or in sliding contact with the inner surface of the guide hole 12d. On the other hand, the elastic part 40b is formed so that the width is narrowed stepwise from the hard part 40a and is spaced apart from the inner surface of the guide hole 12d.
According to this configuration, when the first pusher 40 is slid in the front-rear direction, the elastic part 40b is prevented from slidingly contacting the shaft tube 10, and only the hard part 40a is allowed to come into sliding contact with the inner surface of the guide hole 12d. I can do it. Therefore, the sliding movement of the first pusher 40 is good.

また、第二の押子５０は、硬質合成樹脂材料からなる硬質部５０ａと、この硬質部５０ａよりも軟質な弾性樹脂材料からなる弾性部５０ｂとを二色成形によって形成してなり、軸筒１０内で筆記芯６２に接続される軸筒内進退部５１と、軸筒１０外に露出する操作部５２とを一体に具備している（図１０、図１３及び図１４参照）。
この第二の押子５０は、操作部５２の後端部を、他の二つの第一の押子４０の操作部４２よりも後方側に配置している（図１参照）。 The second pusher 50 is formed by two-color molding of a hard part 50a made of a hard synthetic resin material and an elastic part 50b made of an elastic resin material softer than the hard part 50a. It integrally includes an in-barrel reciprocating part 51 connected to the writing lead 62 within the barrel 10 and an operating part 52 exposed outside the barrel 10 (see FIGS. 10, 13, and 14).
The second pusher 50 has the rear end portion of the operating section 52 arranged on the rear side of the operating sections 42 of the other two first pushers 40 (see FIG. 1).

軸筒内進退部５１は、前後方向へわたる長尺棒状に形成され、当接部５１ｅ等を除く大部分が、硬質部５０ａにより形成される。
この軸筒内進退部５１は、第一の押子４０の軸筒内進退部４１と略同様にして、筆記芯６２に対し後方側から圧入接続される筆記芯接続部５１ａ、コイルスプリング６４に対し後方側から挿入されるコイル接続部５１ｂ、コイル接続部５１ｂの外周面から軸筒径方向外側へ部分的に突出する偏心突起５１ｂ１、偏心突起５１ｂ１よりも後側でコイルスプリング６４の後端部を受けるコイル受け部５１ｂ２、他の押子と係合させるための係合突起５１ｃ及び係合突起５１ｄ等を有する。 The in-cylinder reciprocating portion 51 is formed in the shape of a long bar extending in the front-rear direction, and most of it except for the contact portion 51e and the like is formed by a hard portion 50a.
This cylinder-internal reciprocating part 51 is connected to a writing lead connecting part 51a and a coil spring 64, which are press-fitted and connected to the writing lead 62 from the rear side, in substantially the same way as the in-shaft cylinder reciprocating part 41 of the first pusher 40. On the other hand, the coil connecting portion 51b inserted from the rear side, the eccentric protrusion 51b1 partially protruding outward in the radial direction of the shaft cylinder from the outer peripheral surface of the coil connecting portion 51b, and the rear end of the coil spring 64 on the rear side of the eccentric protrusion 51b1. It has a coil receiving part 51b2 for receiving the coil, an engaging protrusion 51c and an engaging protrusion 51d for engaging with other pushers, and the like.

コイル受け部５１ｂ２は、先に説明したコイル受け部４１ｂ２と同様に、外側部分５１ｂ２１と内側部分５１ｂ２２を有する段状に形成される（図１６（ａ）参照）。このコイル受け部５１ｂ２も、図１６（ｂ）（ｃ）に示すコイル受け部５１ｂ２’，５１ｂ２”のように、傾斜面を有する態様に置換することが可能である。 The coil receiving portion 51b2 is formed in a stepped shape having an outer portion 51b21 and an inner portion 51b22, similar to the coil receiving portion 41b2 described above (see FIG. 16(a)). The coil receiving portion 51b2 can also be replaced with a form having an inclined surface, as in the coil receiving portions 51b2' and 51b2'' shown in FIGS. 16(b) and 16(c).

軸筒内進退部５１の後端側には、前後方向に対し直交する幅方向の両側へ突出するように二つの規制部５１ｇ，５１ｇが設けられる（図１７参照）。これら二つの規制部５１ｇは、第二の押子５０が後退した状態で、軸筒内後端側の二つの傾斜面１２ｆ３にそれぞれ近接又は接触して、第二の押子５０の径方向外側への移動を規制する。 Two restricting portions 51g, 51g are provided on the rear end side of the in-cylinder advancing/retracting portion 51 so as to protrude to both sides in the width direction orthogonal to the front-rear direction (see FIG. 17). When the second pusher 50 is retracted, these two regulating portions 51g are close to or in contact with the two inclined surfaces 12f3 on the rear end side of the shaft cylinder, and are arranged on the radially outer side of the second pusher 50. restrict movement to.

さらに、軸筒内進退部５１の後端側には、弾性部５０ｂからなる当接部５１ｅが後方向きに突設している。この当接部５１ｅは、第二の押子５０が後退した際に、軸筒１０内の被当接部１２ｈに当接する。この当接部５１ｅを形成する弾性材料は、操作部５２に連続している。 Further, on the rear end side of the in-cylinder reciprocating portion 51, a contact portion 51e consisting of an elastic portion 50b is provided to protrude rearward. This abutting portion 51e abuts against the abutted portion 12h inside the shaft tube 10 when the second pusher 50 retreats. The elastic material forming this contact portion 51e is continuous with the operating portion 52.

すなわち、この当接部５１ｅは、硬質部５０ａの中を通って操作部５２に連続しており、弾性部５０ｂによって操作部５２と一体に形成される（図１０及び図１３参照）。したがって、弾性部５０ｂは、第二の押子５０操作時の滑り止めとしての機能と、第二の押子５０後退時の緩衝材としての機能とを併せ持つ。 That is, this contact portion 51e passes through the hard portion 50a and continues to the operating portion 52, and is formed integrally with the operating portion 52 by the elastic portion 50b (see FIGS. 10 and 13). Therefore, the elastic portion 50b has both the function of preventing slipping when the second pusher 50 is operated and the function of a cushioning material when the second pusher 50 is retreated.

この当接部５１ｅの突端面は、図１４に示すように、被当接部１２ｈを構成する面に対し傾斜する傾斜面状に形成される。
この構成によれば、第二の押子５０を後退させた際、傾斜面状の当接部５１ｅが、徐々に被当接部１２ｈに圧接され変形するため、その際の衝撃（当接音及び振動等）を効果的に軽減することができる。
なお、図中、符号５１ｆは、ガイド孔１２ｅ内のガイド面１２ｆ１の前端側で軸筒径方向内側へ凹んだ係止部１２ｆ２に対し掛止される掛止突起である。 As shown in FIG. 14, the protruding end surface of the abutting portion 51e is formed in the shape of an inclined surface that is inclined with respect to the surface constituting the abutted portion 12h.
According to this configuration, when the second pusher 50 is retreated, the inclined surface-shaped abutment part 51e is gradually pressed against the abutted part 12h and deformed, so that the impact (abutment noise) and vibrations) can be effectively reduced.
In addition, in the figure, the reference numeral 51f is a locking protrusion that is locked to a locking portion 12f2 that is recessed inward in the radial direction of the shaft cylinder at the front end side of the guide surface 12f1 in the guide hole 12e.

また、操作部５２は、軸筒内進退部５１の後端側から軸筒径方向外側へ突出して軸筒外に露出している。
この操作部５２は、軸筒外に露出する部分が弾性部５０ｂによって形成される。この弾性部５０ｂは、軸筒内進退部５１後端側の当接部５１ｅまで連続している（図１３参照）。 Further, the operating portion 52 protrudes outward in the radial direction of the shaft cylinder from the rear end side of the intra-cylinder advancing/retreating portion 51 and is exposed to the outside of the shaft cylinder.
A portion of the operating portion 52 that is exposed outside the shaft cylinder is formed by an elastic portion 50b. The elastic portion 50b continues to the abutting portion 51e on the rear end side of the in-cylinder reciprocating portion 51 (see FIG. 13).

そして、第二の押子５０の操作部５２は、他の二つの第一の押子４０の操作部４２とは異なる形状に形成される（図１０参照）。
詳細に説明すれば、操作部５２は、軸筒周方向及び軸筒軸方向の寸法が、操作部４２よりも大きい。
さらに、操作部５２は、軸筒１０外周面から突出する寸法が、操作部４２よりも大きい（図２参照）。 The operating section 52 of the second pusher 50 is formed in a different shape from the operating sections 42 of the other two first pushers 40 (see FIG. 10).
To explain in detail, the operating portion 52 has larger dimensions in the circumferential direction of the shaft cylinder and in the axial direction of the shaft cylinder than the operating portion 42 .
Furthermore, the operating portion 52 has a larger dimension in which it protrudes from the outer circumferential surface of the shaft tube 10 than the operating portion 42 (see FIG. 2).

この操作部５２は、後方へ延設され、その後端部を、軸筒１０の後端部と略面一に配置している。
ここで、前記「略面一」には、操作部５２の後端部が、製造上の誤差や寸法公差の範囲内で、軸筒１０の後端部よりも若干前側や後側に位置する場合を含む。 The operating portion 52 extends rearward, and its rear end is disposed substantially flush with the rear end of the shaft tube 10 .
Here, the above-mentioned "substantially flush" means that the rear end of the operating section 52 is located slightly forward or rearward than the rear end of the shaft cylinder 10 within the range of manufacturing errors and dimensional tolerances. Including cases.

この操作部５２は、当該筆記具Ａの後端側の横断面略楕円状の輪郭を構成している。
すなわち、筆記具Ａの後端側は、図２及び図３に示すように横断面略楕円状に構成される。そして、この楕円における長軸の一端側に操作部５２が配設され、他端側にはクリップ部１２ｂが配設される。 The operating portion 52 has a substantially elliptical profile in cross section on the rear end side of the writing instrument A.
That is, the rear end side of the writing instrument A is configured to have a substantially elliptical cross section as shown in FIGS. 2 and 3. The operating section 52 is disposed at one end of the long axis of this ellipse, and the clip section 12b is disposed at the other end.

軸筒１０内において、上記構成の第一の押子４０と第二の押子５０には、それぞれ、筆記芯６１と筆記芯６２が接続される。
これら筆記芯６１，６２は、インク収容管の前端側に筆記部であるボールペンチップを接続したボールペン用リフィールであり、例えば、異なる色のインクが充填される。
これら筆記芯６１，６２の他例としては、シャープペンシル用リフィールや、電子ペン用筆記芯等とすることも可能である。 Inside the barrel 10, a writing core 61 and a writing core 62 are connected to the first pusher 40 and the second pusher 50 having the above configuration, respectively.
These writing leads 61 and 62 are ballpoint pen refills in which a ballpoint pen tip, which is a writing part, is connected to the front end side of an ink storage tube, and are filled with ink of different colors, for example.
Other examples of these writing leads 61 and 62 include refills for mechanical pencils, writing leads for electronic pens, and the like.

本実施の形態の好ましい一例によれば、筆記芯６２は、当該筆記具Ａが具備する他の筆記芯６１よりも使用頻度が大きい。すなわち、筆記芯６２は、複数の筆記芯のうち、最も使用頻度が大きい。
なお、前記使用頻度は、複数種類の筆記芯について、多数の使用者に対する調査や実験等に基づき、統計的に求めた使用の頻度である。 According to a preferred example of this embodiment, the writing lead 62 is used more frequently than the other writing leads 61 included in the writing instrument A. That is, the writing lead 62 is used most frequently among the plurality of writing leads.
Note that the frequency of use is a frequency of use that is statistically determined based on surveys and experiments with a large number of users regarding multiple types of writing leads.

コイルスプリング６３，６４は、それぞれ、第一の押子４０と第二の押子５０を軸筒１０に対し後方へ付勢するようにした圧縮コイルバネである。 The coil springs 63 and 64 are compression coil springs that urge the first pusher 40 and the second pusher 50 rearward relative to the shaft tube 10, respectively.

一方のコイルスプリング６３は、筆記芯６１の後端側から第一の押子４０のコイル接続部４１ｂにわって環状に装着される。
このコイルスプリング６３は、後端側の内周面が偏心突起４１ｂ１に圧接され、後端部が段状のコイル受け部４１ｂ２に当接することで、後端側が第一の押子４０に対し径方向外側へ偏心して位置するとともに、前端側が径方向外側へ傾いている（図１６（ａ）参照）。
そして、このコイルスプリング６３の前端部は、後述する筆記芯支持部材７０に受けられる。 One coil spring 63 is attached in an annular manner from the rear end side of the writing lead 61 to the coil connecting portion 41b of the first pusher 40.
This coil spring 63 has an inner circumferential surface on the rear end side pressed against the eccentric protrusion 41b1, and a rear end portion in contact with the stepped coil receiving portion 41b2, so that the rear end side has a diameter relative to the first pusher 40. It is located eccentrically outward in the direction, and the front end side is inclined outward in the radial direction (see FIG. 16(a)).
The front end portion of this coil spring 63 is received by a writing lead support member 70, which will be described later.

同様に、他方のコイルスプリング６４は、筆記芯６２の後端側から第二の押子５０のコイル接続部５１ｂにわって環状に装着され、後端側の内周面が偏心突起５１ｂ１に圧接され、後端部が段状のコイル受け部５１ｂ２に当接することで、後端側が径方向外側へ偏心して位置するとともに、前端側が径方向外側へ傾いている。このコイルスプリング６４の前端部も、後述する筆記芯支持部材７０に受けられる。 Similarly, the other coil spring 64 is attached in an annular manner from the rear end side of the writing lead 62 to the coil connecting portion 51b of the second pusher 50, and the inner peripheral surface of the rear end side is pressed against the eccentric protrusion 51b1. Since the rear end portion comes into contact with the stepped coil receiving portion 51b2, the rear end side is positioned eccentrically toward the outside in the radial direction, and the front end side is inclined toward the outside in the radial direction. The front end of this coil spring 64 is also received by a writing lead support member 70, which will be described later.

筆記芯支持部材７０は、軸筒１０の内周面に固定された略円柱状の部材である。
この筆記芯支持部材７０は、複数の筆記芯６１，６２をそれぞれ複数の貫通孔に挿通して、筆記芯間及びコイルスプリング間等の干渉を防ぐ。 The writing lead support member 70 is a substantially cylindrical member fixed to the inner peripheral surface of the shaft tube 10.
This writing lead support member 70 has a plurality of writing leads 61 and 62 inserted through a plurality of through holes, respectively, to prevent interference between the writing leads and between coil springs.

＜作用効果＞
次に、上記構成の筆記具Ａについて、その特徴的な作用効果を説明する。
例えば、使用者等が指で第二の押子５０を前方へ押して前進させると、前進した第二の押子５０は軸筒１０内の係止部１２ｆ２に掛止され、筆記芯６２がその筆記部を軸筒１０前端から突出した状態に維持される。
この後、何れかの第一の押子４０を前進させると、この第一の押子４０の係合突起４１ｃが第二の押子５０の係合突起５１ｄに当接して、第二の押子５０が掛止状態から解除されて後退し、前進した第一の押子４０が、軸筒１０内の係止部に掛止されて、筆記芯６１前端の筆記部が軸筒１０前端開口から突出した状態に維持される。 <Effect>
Next, the characteristic functions and effects of the writing instrument A having the above configuration will be explained.
For example, when a user or the like pushes the second pusher 50 forward with a finger to move it forward, the second pusher 50 that has moved forward is latched to the locking portion 12f2 in the barrel 10, and the writing lead 62 is attached to the second pusher 50. The writing part is maintained in a state protruding from the front end of the barrel 10.
After that, when any of the first pushers 40 is moved forward, the engagement protrusion 41c of the first pusher 40 comes into contact with the engagement protrusion 51d of the second pusher 50, and the second pusher 40 is moved forward. The pusher 50 is released from the latching state and retreats, and the first pusher 40 that has moved forward is latched to the locking part in the barrel 10, so that the writing part at the front end of the writing lead 61 is brought into contact with the front end opening of the barrel 10. maintained in a prominent position.

特に、第二の押子５０が後退した際は、この第二の押子５０の後端側の規制部５１ｇが、軸筒１０内の傾斜面１２ｆ３に近接又は接触する。
このため、第二の押子５０の軸筒径方向の遊びや撓み、寸法バラツキ等に起因して、頭冠３０後端と操作部５２後端との隙間ｓ１（図３参照）が拡がるのを抑制することができ、ひいては、当該筆記具Ａを後方から視た場合の意匠上の体裁を向上することができる。 In particular, when the second pusher 50 retreats, the regulating portion 51g on the rear end side of the second pusher 50 approaches or contacts the inclined surface 12f3 inside the shaft tube 10.
Therefore, the gap s1 (see FIG. 3) between the rear end of the crown 30 and the rear end of the operating part 52 increases due to play, bending, and dimensional variations of the second pusher 50 in the radial direction of the barrel. can be suppressed, and as a result, the design appearance of the writing instrument A when viewed from the rear can be improved.

＜変形例＞
なお、上記実施態様によれば、好ましい一例として、軸筒内進退部５１を挟む両側に規制部５１ｇ，５１ｇ及び傾斜面１２ｆ３，１２ｆ３を設けたが、他例としては、軸筒内進退部５１の後端側に、単数の規制部と、該規制部に対応する単数の傾斜面を設けた態様とすることも可能である。 <Modified example>
In addition, according to the above-mentioned embodiment, as a preferable example, the regulating parts 51g, 51g and the inclined surfaces 12f3, 12f3 are provided on both sides of the inner cylinder advancing and retracting part 51, but as another example, the inner cylinder advancing and retracting part 51 It is also possible to provide an embodiment in which a single restriction part and a single inclined surface corresponding to the restriction part are provided on the rear end side.

また、上記実施態様によれば、押子の操作性及び意匠性を向上した好ましい一例として、第二の押子５０における操作部５２の後端部を、軸筒１０の後端部と略面一に配置したが、他例としては、第二の押子５０における操作部５２の後端部を、軸筒１０の後端部よりも後方側に配置することも可能である。 Further, according to the above embodiment, as a preferable example of improving the operability and design of the pusher, the rear end portion of the operating portion 52 of the second pusher 50 is substantially flush with the rear end portion of the shaft tube 10. However, as another example, the rear end portion of the operating portion 52 of the second pusher 50 may be placed further rearward than the rear end portion of the shaft tube 10.

また、上記実施態様によれば、筆記芯６１，６２及び押子４０，５０を複数設けたが、本願発明は、単数の筆記芯及び押子を具備した筆記具にも適用可能である。 Moreover, according to the embodiment described above, a plurality of writing leads 61, 62 and pushers 40, 50 are provided, but the present invention is also applicable to a writing instrument having a single writing lead and pusher.

また、本発明は上述した実施態様に限定されず、本発明の要旨を変更しない範囲で適宜変更可能である。 Further, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

１０：軸筒
１１：前軸
１１ｄ：雄ネジ部
１１ｃ１：環状突起
１１ｃ２：被押圧面
１２：後軸
１２ａ：雌ネジ部
１２ｃ：押圧面
１２ｇ：凹状部
１２ｇ１：底部
１２ｇ２：周縁側壁部
１２ｇ３：突片部
１２ｇ４：被嵌合突起
１２ｅ１：切欠部
１２ｈ：被当接部
２０：グリップ
３０：頭冠
３２：嵌合部
３２ａ：乗り越え嵌合突起
４０：第一の押子
４０ａ：硬質部
４０ｂ：弾性部
５０：第二の押子
５０ａ：硬質部
５０ｂ：弾性部
４１，５１：軸筒内進退部
４１ｅ，５１ｅ：当接部
４１ｂ，５１ｂ：コイル接続部
４１ｂ１，５１ｂ１：偏心突起
４１ｂ２，５１ｂ２：コイル受け部
４２，５２：操作部
６１，６２：筆記芯
６３，６４：コイルスプリング
Ａ：筆記具
ｓ１，ｓ２：隙間 10: Shaft tube 11: Front shaft 11d: Male threaded portion 11c1: Annular projection 11c2: Pressed surface 12: Rear shaft 12a: Female threaded portion 12c: Pressed surface 12g: Concave portion 12g1: Bottom portion 12g2: Peripheral side wall portion 12g3: Protrusion Piece part 12g4: Fitting protrusion 12e1: Notch part 12h: Abutted part 20: Grip 30: Crown 32: Fitting part 32a: Climbing fitting protrusion 40: First pusher 40a: Hard part 40b: Elasticity Part 50: Second pusher 50a: Hard part 50b: Elastic part 41, 51: Moving part in the shaft cylinder 41e, 51e: Contact part 41b, 51b: Coil connecting part 41b1, 51b1: Eccentric protrusion 41b2, 51b2: Coil Receiving part 42, 52: Operation part 61, 62: Writing lead 63, 64: Coil spring A: Writing instrument s1, s2: Gap

Claims

後端側にクリップ部を有する軸筒と、前記軸筒の周壁に径方向へ挿通されるとともに前記周壁に沿って前後方向へスライド可能な押子と、軸筒内で前記押子に接続された筆記芯とを備え、前記押子を前進させる操作により前記筆記芯がその前端側の筆記部を前記軸筒の前端部から突出させるようにした筆記具において、
前記押子が、軸筒内で前記筆記芯に接続された軸筒内進退部と軸筒外に露出した操作部とを有し、前記軸筒と前記操作部の間に、軸筒後方から視認可能な径方向の隙間が形成されるようにした筆記具であって、
前記軸筒内進退部の後端側には、規制部が設けられ、
前記軸筒の内部には、後退位置にある前記軸筒内進退部の前記規制部に対し後方側から近接又は接触するとともに、後方斜め径内方向へ向かう傾斜面が設けられ、
前記押子に径方向外側向きの力が加わった際、前記規制部が前記傾斜面に接触することにより、前記押子の径方向外側への移動を規制することを特徴とする筆記具。 a shaft cylinder having a clip portion on a rear end side; a pusher inserted into a peripheral wall of the shaft cylinder in a radial direction and slidable in a front-rear direction along the peripheral wall; and a pusher connected to the pusher within the shaft cylinder. A writing instrument comprising a writing lead, the writing lead having a writing part on its front end protruding from the front end of the barrel by an operation of advancing the pusher,
The pusher has an in-barrel advancing/retracting part connected to the writing lead within the barrel, and an operating part exposed outside the barrel, and between the barrel and the operating part, a pusher is inserted from the rear of the barrel. A writing instrument in which a visible radial gap is formed,
A regulating part is provided on the rear end side of the forward and backward movement part in the shaft cylinder,
The inside of the shaft cylinder is provided with an inclined surface that approaches or contacts from the rear side with respect to the restriction part of the inside movement part of the shaft cylinder in the retracted position, and that faces diagonally rearwards in a radial inward direction ,
A writing instrument characterized in that when a radially outward force is applied to the pusher, the regulating portion comes into contact with the inclined surface, thereby regulating the radially outward movement of the pusher .

前記操作部は、後方へ延設され、その後端部を、前記軸筒の後端部と略面一に配置していることを特徴とする請求項１記載の筆記具。 2. The writing instrument according to claim 1, wherein the operating portion extends rearward, and a rear end portion thereof is arranged substantially flush with a rear end portion of the barrel.

前記軸筒内進退部には、前後方向に対し交差する幅方向の両側へ突出するように、前記規制部が設けられ、
前記軸筒の内部には、前記両側の前記規制部に対しそれぞれ後方側から近接又は接触するように、前記傾斜面が二つ設けられていることを特徴とする請求項１又は２記載の筆記具。
The restriction portion is provided in the shaft cylinder forward and backward movement portion so as to protrude to both sides in a width direction intersecting the front-rear direction,
The writing instrument according to claim 1 or 2, wherein the two inclined surfaces are provided inside the barrel so as to approach or contact the regulating portions on both sides from the rear side, respectively. .