JP2023174005A

JP2023174005A - Retractable writing instrument

Info

Publication number: JP2023174005A
Application number: JP2022086596A
Authority: JP
Inventors: 優希有坂; Yuki ARISAKA
Original assignee: Pilot Corp
Current assignee: Pilot Corp
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2023-12-07

Abstract

To provide a retractable writing instrument with no risk of a clip body shaking during writing.SOLUTION: The retractable writing instrument is provided with a retractable mechanism that causes the pen tip of a writing body 10 to protrude from a front end hole 31 of a barrel 2 by pressing a clip body 8 forward. A protrusion 81a is formed on the inner surface of a clip main body 81. An insertion hole 41 that penetrates in the radial direction is formed in the side wall of the barrel 2 in front of a slide hole 21. In the pen tip protruding state, the protrusion 81a of the clip main body 81 is inserted into the insertion hole 41, and an outward protrusion 72 on the outer surface of a rotating member 7 and the protrusion 81a of the clip main body 81 are pressed against each other.SELECTED DRAWING: Figure 3

Description

本発明は、出没式筆記具に関する。詳細には、クリップ体を前方に押圧操作することによって、ペン先を軸筒の前端孔より出没可能に構成した出没式筆記具に関する。 The present invention relates to a retractable writing instrument. Specifically, the present invention relates to a retractable writing instrument in which the pen tip can be retracted from the front end hole of the barrel by pressing the clip body forward.

従来、特許文献１には、軸筒の側壁に前後方向に延びるスライド孔を設け、スライド孔に配設したクリップ体を前方にスライド操作することによって、筆記体のペン先を、軸筒の前端孔から出没自在に構成した筆記具が開示されている。また、前記特許文献１には、回転カム機構を用いた出没機構を備え、クリップ体の軸部と回転部材とが、互いに回転可能且つ互いに前後方向のあそびを有した状態で前後方向に係止され、それによって、ペン先突出状態において、クリップ体の不用意な前後方向の移動が抑えられることが記載されている。 Conventionally, in Patent Document 1, a slide hole extending in the front-rear direction is provided in the side wall of the barrel, and by sliding a clip disposed in the slide hole forward, the tip of the cursive pen can be moved to the front end of the barrel. A writing instrument configured to be freely retractable from a hole is disclosed. Further, Patent Document 1 includes a retractable mechanism using a rotary cam mechanism, and the shaft portion of the clip body and the rotating member are locked in the front-rear direction in a state where they can rotate with each other and have play in the front-rear direction with respect to each other. It is described that, thereby, inadvertent forward and backward movement of the clip body is suppressed when the pen tip is in the protruding state.

国際公開第２０１１／０９６３５７号パンフレットInternational Publication No. 2011/096357 pamphlet

前記特許文献１の構成は、ペン先突出状態において、摩擦操作時のクリップ体の前後方向の大きな移動は抑えられるとしても、筆記時にクリップ体ががたつくおそれがある。 In the configuration of Patent Document 1, even if the large movement of the clip body in the front and rear direction during friction operation is suppressed when the pen tip is in the protruding state, there is a risk that the clip body may rattle during writing.

本願発明は、前記従来の問題点を解決するものであって、筆記時にクリップ体ががたつくおそれがない出没式筆記具を提供しようとするものである。
本願発明で、「前」とはペン先側を指し、「後」とはその反対側を指す。本発明で「ペン先没入状態」とは、ペン先が軸筒内に没入された状態である。本発明で「ペン先突出状態」とは、ペン先が軸筒の前端孔より外部に突出した状態である。 The present invention solves the above-mentioned conventional problems and provides a retractable writing instrument in which there is no risk of the clip body shaking during writing.
In the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side. In the present invention, the "pen tip recessed state" refers to a state in which the pen tip is retracted into the barrel. In the present invention, the "pen tip protruding state" refers to a state in which the pen tip protrudes outside from the front end hole of the barrel.

本願の第１の発明は、軸筒内に筆記体が前後方向に移動可能に収容され、前記軸筒の側壁に前後方向に延びるスライド孔が形成され、前記スライド孔に前後方向に移動可能にクリップ体が設けられ、ペン先没入状態から前記クリップ体を前方に押圧操作することにより前記筆記体のペン先を前記軸筒の前端孔から突出状態にし、前記ペン先突出状態から前記クリップ体を前方に押圧操作することにより前記ペン先を没入状態にする出没機構を備えた出没式筆記具であって、前記出没機構が、前記軸筒内部に形成されたカム部と、前記カム部に係合し且つ前記筆記体の後端部を支持する回転部材と、前記回転部材に回転を付与するカム歯と、前記カム歯を備え且つ前記スライド孔より前記軸筒の外部に突出する前記クリップ体と、前記軸筒内部に収容され且つ前記筆記体を後方に付勢する弾発体と、を備え、前記クリップ体と前記回転部材とが連動して前後方向に移動可能に構成され、前記クリップ体は、前記軸筒外部に配置される前後方向に延びるクリップ本体を備え、前記クリップ本体の径方向の内面に凸部が形成され、前記スライド孔より前方の前記軸筒の側壁に、径方向に貫通する挿入孔が形成され、ペン先突出状態において、前記挿入孔に前記クリップ本体の凸部が挿入され且つ前記回転部材の外面と前記クリップ本体の凸部とが圧接されることを要件とする。 In the first aspect of the present invention, a writing body is housed in a barrel so as to be movable in the front-back direction, and a slide hole extending in the front-back direction is formed in the side wall of the barrel, and the writing body is movable in the front-back direction in the slide hole. A clip body is provided, and by pressing the clip body forward from a state in which the pen tip is retracted, the pen point of the cursive writing is made to protrude from the front end hole of the barrel, and the clip body is removed from the state in which the pen tip protrudes. A retractable writing instrument including a retractable mechanism that makes the pen tip retract by pressing forward, the retractable mechanism engaging a cam portion formed inside the barrel and the cam portion. and a rotating member supporting the rear end of the writing body, cam teeth imparting rotation to the rotating member, and the clip body having the cam teeth and protruding from the slide hole to the outside of the barrel. , an elastic body that is housed inside the barrel and urges the writing body backward; the clip body and the rotating member are configured to be movable in the front-back direction in conjunction with each other, and the clip body comprises a clip body disposed outside the barrel and extending in the front-rear direction, a convex portion being formed on the radially inner surface of the clip body, and a convex portion extending in the radial direction on the side wall of the barrel forward of the slide hole. A pen-through insertion hole is formed, and when the pen tip is in a protruding state, the protrusion of the clip body is inserted into the insertion hole, and the outer surface of the rotating member and the protrusion of the clip body are pressed against each other. .

前記第１の発明の出没式筆記具は、前記構成により、筆記時のクリップ体のがたつきを防止できる。

。 The retractable writing instrument of the first invention can prevent the clip body from wobbling during writing due to the above structure.

.

本願の第２の発明は、前記第１の発明の出没式筆記具において、前記回転部材の外面に複数の外向突起が形成され、ペン先没入状態及びペン先突出状態において、前記挿入孔に前記凸部が挿入され、ペン先突出状態において、前記外向突起と前記凸部とが圧接され、ペン先没入状態において、前記凸部が前記外向突起の相互間の回転部材の外面の径方向外方に配置され且つ前記外向突起と前記凸部とが非接触状態にされることを要件とする。 A second invention of the present application is the retractable writing instrument according to the first invention, wherein a plurality of outward protrusions are formed on the outer surface of the rotating member, and when the pen tip is retracted and the pen tip is protruded, the protrusion is formed in the insertion hole. is inserted, and when the pen tip is in the protruding state, the outward protrusion and the convex part are in pressure contact, and when the pen tip is in the retracted state, the convex part is radially outward of the outer surface of the rotating member between the outward protrusions. and the outward protrusion and the convex portion are required to be in a non-contact state.

前記第２の発明の出没式筆記具は、前記構成により、回転部材とクリップ本体の凸部とが常時圧接することを回避でき、回転部材の円滑な回転が得られ、その結果、クリップ体のスムーズな前後の操作性を維持できる。 The retractable writing instrument according to the second aspect of the present invention can avoid constant pressure contact between the rotating member and the convex portion of the clip body, and as a result, smooth rotation of the rotating member can be obtained, and as a result, the clip body can be smoothly rotated. Maintains easy front-to-back operability.

本願の第３の発明は、前記第２の発明の出没式筆記具において、前記挿入孔の前端部に後方に突出する解除壁部が形成され、ペン先突出状態からペン先没入状態に移行する過程で、前記解除壁部が前記凸部と前記外向突起との間に挿入されることにより前記凸部と前記外向突起との圧接が解除されることを要件とする。 A third invention of the present application is the retractable writing instrument according to the second invention, in which a releasing wall portion projecting rearward is formed at the front end of the insertion hole, and a process of transitioning from the pen tip protruding state to the pen tip retracting state is provided. The release wall portion is inserted between the convex portion and the outward protrusion to release the pressure contact between the convex portion and the outward protrusion.

前記第３の発明の出没式筆記具は、前記構成により、ペン先突出状態からペン先没入状態に移行する際の回転部材の円滑な回転が得られ、その結果、クリップ体のスムーズな前後の操作性を維持できる。仮に、ペン先突出状態からペン先没入状態に移行するための押圧操作時、凸部と外向突起とが圧接状態のままで前方に移動した場合、回転部材が円滑に回転できず、クリップ体のスムーズな操作性が得られないおそれがある。 In the retractable writing instrument of the third invention, the configuration allows smooth rotation of the rotating member when transitioning from the pen tip protruding state to the pen tip retracting state, and as a result, smooth back and forth operation of the clip body is achieved. You can maintain your sexuality. If the convex portion and the outward protrusion move forward while remaining in pressure contact during the pressing operation to transition from the pen tip protruding state to the pen tip retracting state, the rotating member will not be able to rotate smoothly and the clip body will There is a possibility that smooth operability may not be obtained.

本発明の出没式筆記具は、筆記時にクリップ体ががたつくおそれがない。 With the retractable writing instrument of the present invention, there is no fear that the clip body will rattle during writing.

本発明の実施の形態のペン先没入状態を示す縦断面図である。FIG. 3 is a longitudinal cross-sectional view showing the pen tip retracted state according to the embodiment of the present invention. 図１の出没式筆記具のペン先突出状態を示す縦断面図である。FIG. 2 is a longitudinal cross-sectional view showing the pen tip of the retractable writing implement of FIG. 1 in a protruding state. 図１の内部構造を示す一部縦断面図である。FIG. 2 is a partial vertical sectional view showing the internal structure of FIG. 1. FIG. 図２の内部構造を示す一部縦断面図である。3 is a partial vertical sectional view showing the internal structure of FIG. 2. FIG. （ａ）は図３のＡ－Ａ線断面図であり、（ｂ）は図４のＢ－Ｂ線断面図である。(a) is a sectional view taken along line AA in FIG. 3, and (b) is a sectional view taken along line BB in FIG. 図４の要部拡大縦断面図である。FIG. 5 is an enlarged vertical cross-sectional view of the main part of FIG. 4; 図１の中間軸の縦断面図、図１の回転部材及び円筒体の正面図である。FIG. 2 is a longitudinal sectional view of the intermediate shaft in FIG. 1 and a front view of the rotating member and cylindrical body in FIG. 1. FIG. 図１のクリップ体を省略した軸筒の要部正面図である。FIG. 2 is a front view of the main parts of the shaft cylinder with the clip body of FIG. 1 omitted.

本発明の実施の形態の出没式筆記具１を図１乃至図８に示す。 A retractable writing instrument 1 according to an embodiment of the present invention is shown in FIGS. 1 to 8.

本実施の形態の出没式筆記具１は、軸筒２と、該軸筒２内に収容される筆記体１０と、該筆記体１０のペン先１０１を軸筒２の前端孔３１から出没自在にさせる出没機構と、を備える。 The retractable writing instrument 1 of the present embodiment includes a barrel 2, a writing body 10 housed in the barrel 2, and a pen tip 101 of the writing body 10 that can freely extend and retract from a front end hole 31 of the barrel 2. and a retractable mechanism.

・筆記体
前記筆記体１０は、ペン先１０１と、該ペン先１０１が前端開口部に圧入固着されたインキ収容管１０２と、該インキ収容管１０２内に充填されるインキ（例えば熱変色性インキ）と、該インキの後端に充填され且つ該インキの消費に伴い前進する追従体（例えば高粘度流体）とからなる。インキ収容管１０２の後端開口部に、インキ収容管１０２と外部とが通気可能な通気孔を備えた尾栓１０３が取り付けられる。 - Cursive body The cursive body 10 includes a pen nib 101, an ink storage tube 102 into which the pen nib 101 is press-fitted into the front end opening, and an ink (for example, thermochromic ink) filled in the ink storage tube 102. ), and a follower (for example, a high-viscosity fluid) that is filled at the rear end of the ink and moves forward as the ink is consumed. A tail plug 103 having a vent hole that allows ventilation between the ink storage tube 102 and the outside is attached to the rear end opening of the ink storage tube 102 .

前記ペン先１０１は、例えば、前端に回転可能にボールを抱持した金属製のボールペンチップのみからなる構成、または前記ボールペンチップの後部外面を保持した合成樹脂製のペン先ホルダーからなる構成のいずれであってもよい。前記ペン先１０１の内部には、前端のボールを前方に押圧するスプリングが収容される。前記スプリングは、圧縮コイルスプリングの前端部にストレート状のロッド部を備えた構成であり、前記ロッド部の前端がボール後面に接触している。非筆記時、前記スプリングの前方付勢によりボールがボールペンチップ前端の内向きの前端縁部内面に密接され、ペン先の前端からのインキの漏出及びインキの蒸発を防止できる。 The pen nib 101 may be configured, for example, to consist of only a metal ballpoint pen tip with a ball rotatably held at the front end, or a synthetic resin nib holder that holds the rear outer surface of the ballpoint pen tip. It may be. A spring that presses the ball at the front end forward is housed inside the pen tip 101. The spring includes a straight rod portion at the front end of a compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the forward bias of the spring brings the ball into close contact with the inner surface of the inward front edge of the front end of the ballpoint pen tip, thereby preventing ink leakage and evaporation from the front end of the pen tip.

・軸筒
前記軸筒２は、先細円筒状の前軸３と、該前軸３の後端部に連結される円筒状の中間軸４と、該中間軸４の後端部に連結される円筒状の後軸５とからなる。 - Shaft cylinder The shaft cylinder 2 includes a tapered cylindrical front shaft 3, a cylindrical intermediate shaft 4 connected to the rear end of the front shaft 3, and a cylindrical intermediate shaft 4 connected to the rear end of the intermediate shaft 4. It consists of a cylindrical rear shaft 5.

・前軸
前記前軸３は、合成樹脂（例えば、ポリカーボネート樹脂）の成形体からなる先細円筒状の本体と、該本体外面に設けられる弾性材料からなる把持部とからなる。前記把持部は、２色成形または本体外面への装着により設けられる。前記前軸３の後端部は縮径され、その外面にはオネジ部が形成される。前記前軸３の前端には、前端孔３１が前後方向に貫設される。前軸３内部に弾発体１１（圧縮コイルスプリング）が収容される。 - Front shaft The front shaft 3 consists of a tapered cylindrical main body made of a molded body of synthetic resin (for example, polycarbonate resin), and a gripping part made of an elastic material provided on the outer surface of the main body. The grip portion is provided by two-color molding or by attachment to the outer surface of the main body. The diameter of the rear end of the front shaft 3 is reduced, and a male thread is formed on the outer surface thereof. A front end hole 31 is provided through the front end of the front shaft 3 in the front-rear direction. An elastic body 11 (compression coil spring) is housed inside the front shaft 3.

・中間軸
前記中間軸４は、円筒状の合成樹脂（例えば、ポリカーボネート樹脂）の成形体からなる。前記中間軸４の前端部内面には、メネジ部が形成される。前記メネジ部に前記前軸３のオネジ部が螺合可能である。前記中間軸４の後端部には、縮径部が一体に形成される。前記中間軸４の後端部側壁には、前端が閉鎖され且つ後端が開放された、前後方向に延びる第１の長孔４２が形成される。また、前記第１の長孔４２より前方の中間軸４の外面には、前後方向に延びる挿入孔４１が形成される。第１の長孔４２及び挿入孔４１は径方向に貫通される。挿入孔４１は、第１の長孔４２から軸方向前方に延びる仮想延長線上に形成される。 - Intermediate shaft The intermediate shaft 4 is made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A female thread is formed on the inner surface of the front end of the intermediate shaft 4. The male threaded portion of the front shaft 3 can be screwed into the female threaded portion. A reduced diameter portion is integrally formed at the rear end portion of the intermediate shaft 4. A first elongated hole 42 extending in the front-rear direction is formed in the side wall of the rear end of the intermediate shaft 4 and has a closed front end and an open rear end. Furthermore, an insertion hole 41 extending in the front-rear direction is formed on the outer surface of the intermediate shaft 4 in front of the first elongated hole 42 . The first elongated hole 42 and the insertion hole 41 are penetrated in the radial direction. The insertion hole 41 is formed on a virtual extension line extending forward in the axial direction from the first long hole 42 .

・カム部
図７に示すように、前記縮径部より前方の前記中間軸４の内周面には、カム部６が一体に形成される。カム部６は、前方且つ径方向内方に突出する鋸歯状の複数（例えば４個）のカム歯６１と、該カム歯６１間に形成される、前後方向に延びる複数（例えば４本）のカム溝６２とを備える。前記カム部６のカム歯６１は、第１カム斜面６１ａと、第２カム斜面６１ｂと、第１カム斜面６１ａと第２カム斜面６１ｂとの間に形成される係止面６１ｃとを備える。係止面６１ｃは、軸方向に延びる面からなる。各々の第１カム斜面６１ａと係止面６１ｃとの間のカム歯６１には、軸方向に延びる凹溝６３が形成される。凹溝６３はカム溝６２よりも浅い深さを有する。即ち、凹溝６３の径方向の底面は、カム溝６２の径方向の底面より径方向内方に位置している。尚、本実施の形態では、カム部６が軸筒２を構成する部材（例えば中間軸４）の内周面に一体に形成される構成であるが、これ以外に、カム部６を有する別部材を軸筒２の内周面に取り付ける構成でもよい。 - Cam portion As shown in FIG. 7, a cam portion 6 is integrally formed on the inner circumferential surface of the intermediate shaft 4 in front of the reduced diameter portion. The cam portion 6 includes a plurality (for example, four) of serrated cam teeth 61 that protrude forward and radially inward, and a plurality (for example, four) of serrated cam teeth 61 that extend in the front-rear direction and are formed between the cam teeth 61. cam groove 62. The cam teeth 61 of the cam portion 6 include a first cam slope 61a, a second cam slope 61b, and a locking surface 61c formed between the first cam slope 61a and the second cam slope 61b. The locking surface 61c consists of a surface extending in the axial direction. A concave groove 63 extending in the axial direction is formed in the cam tooth 61 between each first cam slope 61a and the locking surface 61c. The concave groove 63 has a shallower depth than the cam groove 62. That is, the radial bottom surface of the concave groove 63 is located radially inward from the radial bottom surface of the cam groove 62. In this embodiment, the cam part 6 is formed integrally with the inner circumferential surface of the member (for example, the intermediate shaft 4) constituting the shaft cylinder 2. A structure in which the member is attached to the inner circumferential surface of the shaft cylinder 2 may also be used.

・後軸
後軸５は、円筒状の合成樹脂（例えば、ポリカーボネート樹脂）の成形体からなる。前記後軸５の前端部側壁には、前端が開放され且つ後端が閉鎖された、前後方向に延びる第２の長孔５１が形成される。第２の長孔５１は径方向に貫通される。後軸５の後端には、ゴム弾性材料からなる摩擦体１２が取り付けられる。摩擦体１２を用いて、被筆記面上の熱変色性インキによる筆跡を摩擦することによって、該筆跡を熱変色させることができる。 - Rear shaft The rear shaft 5 is made of a cylindrical molded body of synthetic resin (for example, polycarbonate resin). A second elongated hole 51 extending in the front-rear direction is formed in the side wall of the front end of the rear shaft 5 and has an open front end and a closed rear end. The second long hole 51 is penetrated in the radial direction. A friction body 12 made of a rubber elastic material is attached to the rear end of the rear shaft 5. By using the friction body 12 to rub the handwriting made of thermochromic ink on the surface to be written, the handwriting can be thermally discolored.

・回転部材
図３乃至図７に示すように、前記回転部材７は、その外周面に前後方向に延びる複数本（例えば４本）の突条７１が等間隔に一体に形成される。各々の突条７１の後端にはカム斜面７１ａが形成される。前記突条７１が、カム部６のカム歯６１（第１カム斜面６１ａ、第２カム斜面６１ｂ、及び係止面６１ｃ）及びカム部６のカム溝６２に係合される。回転部材７の内部には前後方向に貫通する内孔が形成される。回転部材７は合成樹脂（例えばポリアセタール樹脂）の成形体により得られる。 - Rotating member As shown in FIGS. 3 to 7, the rotating member 7 is integrally formed with a plurality of (for example, four) protrusions 71 extending in the front-rear direction at equal intervals on its outer peripheral surface. A cam slope 71a is formed at the rear end of each protrusion 71. The protrusion 71 is engaged with the cam teeth 61 (the first cam slope 61a, the second cam slope 61b, and the locking surface 61c) of the cam portion 6 and the cam groove 62 of the cam portion 6. An inner hole penetrating in the front-rear direction is formed inside the rotating member 7. The rotating member 7 is obtained from a molded body of synthetic resin (for example, polyacetal resin).

・外向突起
前記突条７１より前方の回転部材７の外周面に、軸方向に延びる複数本（例えば４本）のリブからなる外向突起７２が等間隔に一体に形成される。外向突起７２は、突条７１と突条７１との中点位置から軸方向前方に延びる仮想延長線上に形成される。各々の外向突起７２の外面と中間軸４の内面とが摺接可能に構成される。尚、本実施の形態では、外向突起７２は回転部材７の外周面に一体に形成される構成であるが、これ以外にも、外向突起７２を有する別部材を回転部材７に取り付ける構成でもよい。 - Outward Protrusions On the outer circumferential surface of the rotating member 7 in front of the protrusions 71, outward protrusions 72 consisting of a plurality of (for example, four) ribs extending in the axial direction are integrally formed at equal intervals. The outward protrusion 72 is formed on an imaginary extension line extending axially forward from the midpoint between the protrusions 71 . The outer surface of each outward projection 72 and the inner surface of the intermediate shaft 4 are configured to be able to come into sliding contact. In this embodiment, the outward protrusion 72 is formed integrally with the outer circumferential surface of the rotating member 7, but other than this, a separate member having the outward protrusion 72 may be attached to the rotating member 7. .

各々の外向突起７２の外面は、横断面が凸曲面となっている。それにより、各々の外向突起７２の外面とクリップ本体８１の凸部８１ａとの周方向の円滑な摺接が可能となり、且つ、各々の外向突起７２の外面と中間軸４（軸筒２）の内面との周方向の円滑な摺接が可能となり、回転部材７の円滑な回転が得られ、その結果、クリップ体８のスムーズな前後の操作性が維持される。 The outer surface of each outward projection 72 has a convexly curved cross section. Thereby, smooth sliding contact in the circumferential direction between the outer surface of each outward protrusion 72 and the convex portion 81a of the clip main body 81 is made possible, and the outer surface of each outward protrusion 72 and the intermediate shaft 4 (shaft cylinder 2) can be smoothly contacted. Smooth sliding contact with the inner surface in the circumferential direction is possible, and smooth rotation of the rotating member 7 is obtained, and as a result, smooth back and forth operability of the clip body 8 is maintained.

各々の外向突起７２の外面は、縦断面において前端面及び後端面に、傾斜面または曲面からなる面取り部が形成される。それにより、各々の外向突起７２の外面と軸筒２内面（中間軸４内面）との軸方向の円滑な摺接が可能である。 On the outer surface of each outward projection 72, chamfered portions consisting of inclined surfaces or curved surfaces are formed on the front end surface and the rear end surface in the longitudinal section. This allows smooth sliding contact between the outer surface of each outward projection 72 and the inner surface of the shaft cylinder 2 (the inner surface of the intermediate shaft 4) in the axial direction.

・クリップ体
図６に示すように、前記クリップ体８は、前後方向に延びるクリップ本体８１と、該クリップ本体８１の後部に一体に連設される径方向に延びる基部８２と、該基部８２と一体に連設され且つ基部８２より前方に延びる軸部８３とを備える。さらに、クリップ体８は、軸部８３の外周面に取り付けられる円筒体９を備える。クリップ体８は、合成樹脂（例えば、ポリカーボネート樹脂）の成形体により得られる。クリップ本体８１と軸筒２外面との間に衣服のポケット等の被挟持物を挿入した際、クリップ本体８１は径方向外方に弾性変形され、それにより、クリップ本体８１と軸筒２外面との間で被挟持物が挟持される。 - Clip body As shown in FIG. 6, the clip body 8 includes a clip body 81 extending in the front-rear direction, a base part 82 extending in the radial direction integrally connected to the rear part of the clip body 81, and the base part 82. The shaft portion 83 is integrally arranged and extends forward from the base portion 82. Further, the clip body 8 includes a cylindrical body 9 attached to the outer peripheral surface of the shaft portion 83. The clip body 8 is obtained from a molded body of synthetic resin (for example, polycarbonate resin). When an object to be held, such as a clothing pocket, is inserted between the clip body 81 and the outer surface of the shaft tube 2, the clip body 81 is elastically deformed radially outward, thereby causing the clip body 81 and the outer surface of the shaft tube 2 to The object to be held is held between the two.

・凸部
前記クリップ本体８１の径方向内面に径方向内方に突出する凸部８１ａが一体に突設される。凸部８１ａは軸方向に延びる板状に形成される。凸部８１ａの表面の頂部は、縦断面が凸曲面となっており、それにより、衣服のポケット等の被挟持物にスムーズが挿入及び取り外しが可能となる。また、凸部８１ａの表面の頂部の周方向の両側縁部には、傾斜面またはＲ曲面からなる面取りが設けられ、凸部８１ａと外向突起７２との円滑な摺接が可能となる。これ以外に、凸部８１ａの表面の頂部は、球面状であってもよい。凸部８１ａは、挿入孔４１に挿入される。凸部８１ａは、軸筒２の内面（中間軸４の内面）より径方向内方に僅かに突出される。それにより、凸部８１ａが外向突起７２に圧接可能に構成される。 - Convex portion A convex portion 81a that protrudes radially inward is integrally provided on the radially inner surface of the clip main body 81. The convex portion 81a is formed into a plate shape extending in the axial direction. The apex of the surface of the convex portion 81a has a convex curved longitudinal section, which allows smooth insertion and removal into and from an object to be held, such as a pocket of clothing. Further, chamfers made of inclined surfaces or R-curved surfaces are provided on both edges in the circumferential direction of the top of the surface of the convex portion 81a, allowing smooth sliding contact between the convex portion 81a and the outward protrusion 72. In addition to this, the top of the surface of the convex portion 81a may be spherical. The protrusion 81a is inserted into the insertion hole 41. The convex portion 81a projects slightly inward in the radial direction from the inner surface of the shaft cylinder 2 (the inner surface of the intermediate shaft 4). Thereby, the convex portion 81a is configured to be able to come into pressure contact with the outward protrusion 72.

・円筒体
図３、図４及び図６に示すように、前記円筒体９の前端には、Ｖ状状のカム斜面からなるカム歯９１が周状に一体に形成される。前記円筒体９の内部には、内孔が前後方向に貫通される。クリップ体８と円筒体９とは、一体となって前後方向に移動可能となる。前記円筒体９の外周面には、複数のガイド突起９２が一体に形成され、前記ガイド突起９２が、カム部６のカム溝６２及び凹溝６３に沿って前後方向に移動可能に係合し、それによって、軸筒２内での円筒体９の回転が阻止される。前記円筒体９は合成樹脂（例えばポリアセタール樹脂）の成形体により得られる。本実施の形態では、カム歯９１が、クリップ体８の軸部８３に取り付ける別部材（即ち円筒体９）に一体に形成される構成であるが、これ以外にも、カム歯９１がクリップ体８の軸部８３に一体に形成される構成でもよい。 - Cylindrical body As shown in FIGS. 3, 4 and 6, cam teeth 91 consisting of a V-shaped cam slope are integrally formed around the front end of the cylindrical body 9. An inner hole is passed through the inside of the cylindrical body 9 in the front-rear direction. The clip body 8 and the cylindrical body 9 are integrally movable in the front-back direction. A plurality of guide protrusions 92 are integrally formed on the outer peripheral surface of the cylindrical body 9, and the guide protrusions 92 engage movably in the front-rear direction along the cam groove 62 and the groove 63 of the cam portion 6. , thereby preventing rotation of the cylindrical body 9 within the shaft tube 2. The cylindrical body 9 is obtained by molding a synthetic resin (for example, polyacetal resin). In this embodiment, the cam teeth 91 are formed integrally with a separate member (i.e., the cylindrical body 9) that is attached to the shaft portion 83 of the clip body 8. It may be configured to be integrally formed with the shaft portion 83 of No. 8.

前記中間軸４と前記後軸５とが連結され、前記第１の長孔４２と第２の長孔５１とにより、前後方向に延びるスライド孔２１が形成される。スライド孔２１より径方向外方にクリップ体８（クリップ本体８１及び基部８２の一部）が突出され、前記クリップ体８がスライド孔２１に沿って前後方向にスライド可能に構成される。 The intermediate shaft 4 and the rear shaft 5 are connected, and the first elongated hole 42 and the second elongated hole 51 form a slide hole 21 extending in the front-rear direction. The clip body 8 (a portion of the clip body 81 and the base portion 82) protrudes radially outward from the slide hole 21, and the clip body 8 is configured to be slidable in the front-rear direction along the slide hole 21.

・出没機構
前記出没機構は、軸筒２側壁より径方向外方に突出するクリップ体８を前方に押圧操作（スライド操作）するものであり、回転カム機構を用いたサイドスライド式出没機構である。前記出没機構は、中間軸４内周面に形成されたカム部６と、該カム部６に係合し且つ筆記体１０の後端に当接する回転部材７と、該回転部材７に係合し回転部材７に回転を付与するカム歯９１と、該カム歯９１を備え且つスライド孔２１より径方向外方に突出するクリップ体８と、軸筒２内部（前軸３内部）に収容され且つ筆記体１０を後方に付勢する弾発体１１（例えば圧縮コイルスプリング）とからなる。本実施の形態の出没機構は、ペン先を突出させる操作及びペン先を没入させる操作のいずれもがクリップ体８を前方にスライド操作するダブルノック式である。・Protrusion/retraction mechanism The above-mentioned ejection/retraction mechanism is a side sliding type ejection mechanism that presses (slides) forward the clip body 8 that projects radially outward from the side wall of the shaft cylinder 2, and uses a rotating cam mechanism. . The retractable mechanism includes a cam portion 6 formed on the inner peripheral surface of the intermediate shaft 4, a rotating member 7 that engages with the cam portion 6 and comes into contact with the rear end of the writing body 10, and a rotating member 7 that engages with the rotating member 7. cam teeth 91 for imparting rotation to the rotating member 7; a clip body 8 provided with the cam teeth 91 and protruding radially outward from the slide hole 21; It also includes an elastic body 11 (for example, a compression coil spring) that urges the writing body 10 backward. The projecting/retracting mechanism of this embodiment is a double-knock type in which the clip body 8 is slid forward for both the operation of protruding the pen tip and the operation of retracting the pen tip.

前記カム部６は、前方且つ径方向内方に突出する鋸歯状の複数（例えば４個）のカム歯６１と、該カム歯６１間に形成される、前後方向に延びる複数（例えば４本）のカム溝６２とを備える。前記回転部材７は、その外周面に長手方向に延びる複数本（例えば４本）の突条７１を備える。前記回転部材７の突条７１が、カム部６のカム歯６１及びカム部６のカム溝６２に係合される。前記クリップ体８の軸部８３に取り付けられた円筒体９の前端には、回転部材７の突条７１の後端のカム斜面７１ａと係合するカム歯９１が周状に一体に形成される。 The cam portion 6 includes a plurality (for example, four) of serrated cam teeth 61 that protrude forward and radially inward, and a plurality (for example, four) of serrated cam teeth 61 that extend in the front-rear direction and are formed between the cam teeth 61. cam groove 62. The rotating member 7 includes a plurality of (for example, four) protrusions 71 extending in the longitudinal direction on its outer peripheral surface. The protrusion 71 of the rotating member 7 is engaged with the cam teeth 61 of the cam portion 6 and the cam groove 62 of the cam portion 6. At the front end of the cylindrical body 9 attached to the shaft part 83 of the clip body 8, cam teeth 91 that engage with the cam slope 71a at the rear end of the protrusion 71 of the rotating member 7 are integrally formed in a circumferential manner. .

・ペン先の出没
ペン先没入状態からクリップ体８を、弾発体１１による後方付勢に抗して前方にスライド操作すると、クリップ体８の軸部８３に取り付けられた円筒体９によって回転部材７が前方に押圧され、前記回転部材７の突条７１がカム溝６２に沿って前方に移動する。それに伴って、前記回転部材７が筆記体１０の後端を前方に押圧し、ペン先が前端孔３１より外部に突出される。このとき、前記軸部８３に取り付けられた円筒体９のカム歯９１と前記回転部材７の突条７１後端のカム斜面７１ａとの当接によって回転部材７がカム部６に対して一定角度だけ回転する。それにより、前記回転部材７の突条７１後端部がカム部６のカム歯６１の係止面６１ｃに係止され、ペン先突出状態が維持される。 - Protrusion of the pen tip When the clip body 8 is slid forward from the pen tip retracted state against the backward bias by the resilient body 11, the rotating member is moved by the cylindrical body 9 attached to the shaft portion 83 of the clip body 8. 7 is pressed forward, and the protrusion 71 of the rotating member 7 moves forward along the cam groove 62. Accordingly, the rotating member 7 presses the rear end of the writing body 10 forward, and the pen tip is projected to the outside from the front end hole 31. At this time, the cam teeth 91 of the cylindrical body 9 attached to the shaft part 83 come into contact with the cam slope 71a at the rear end of the protrusion 71 of the rotary member 7, so that the rotary member 7 is angled at a certain angle with respect to the cam part 6. only rotates. As a result, the rear end portion of the protrusion 71 of the rotating member 7 is engaged with the engagement surface 61c of the cam tooth 61 of the cam portion 6, and the pen tip protruding state is maintained.

ペン先突出状態からクリップ体８を、弾発体１１による後方付勢に抗して前方にスライド操作すると、クリップ体８の軸部８３に取り付けられた円筒体９が回転部材７を前方に押圧し、前記円筒体９のカム歯９１と前記回転部材７の突条７１後端との当接によって回転部材７がカム部６に対して一定角度だけ回転する。それによって、前記突条７１後端部とカム部６のカム歯６１との係止状態が解除され、弾発体１１による後方付勢により、前記突条７１がカム部６のカム溝６２に沿って後方に移動する。前記回転部材７が後方に移動することに伴って、筆記体１０が後方に移動し、ペン先没入状態となる。 When the clip body 8 is slid forward from the pen tip protruding state against the backward bias by the resilient body 11, the cylindrical body 9 attached to the shaft portion 83 of the clip body 8 presses the rotating member 7 forward. However, due to the contact between the cam teeth 91 of the cylindrical body 9 and the rear end of the protrusion 71 of the rotating member 7, the rotating member 7 rotates by a certain angle with respect to the cam portion 6. As a result, the engagement between the rear end of the protrusion 71 and the cam teeth 61 of the cam portion 6 is released, and the protrusion 71 is pushed into the cam groove 62 of the cam portion 6 due to the backward bias by the resilient body 11. move backwards along. As the rotary member 7 moves backward, the writing body 10 moves backward and enters the pen tip recessed state.

・凸部と外向突起の作用
次に凸部８１ａと外向突起７２の作用について順に説明する。
図３及び図５（ａ）に示すように、ペン先没入状態において、回転部材７の外向突起７２の相互間の外周面とクリップ本体８１の凸部８１ａとが近接し、回転部材７の外向突起７２とクリップ本体８１の凸部８１ａとが非接触状態にある。 - Effects of the convex portion and the outward protrusion Next, the effects of the convex portion 81a and the outward protrusion 72 will be explained in order.
As shown in FIGS. 3 and 5(a), when the pen tip is in the retracted state, the outer peripheral surface between the outward projections 72 of the rotating member 7 and the convex portion 81a of the clip body 81 are close to each other, and the outward direction of the rotating member 7 The protrusion 72 and the convex portion 81a of the clip body 81 are in a non-contact state.

ペン先没入状態からクリップ体８を前方にスライド操作し、回転部材７の突条７１とカム溝６２との係合が解除されてから、突条７１後端のカム斜面７１ａが、第１カム斜面６１ａに沿って移動し係止面６１ｃに係止されるまでに、回転部材７が回転する（即ちペン先突出状態になるまで回転部材７が回転する）。それにより、図４及び図５（ｂ）に示すように、外向突起７２が凸部８１ａに周方向から接触し、ペン先突出状態になると同時に外向突起７２と凸部８１ａとが径方向に圧接された状態となる。 After the clip body 8 is slid forward from the pen tip retracted state and the engagement between the protrusion 71 of the rotary member 7 and the cam groove 62 is released, the cam slope 71a at the rear end of the protrusion 71 is aligned with the first cam. The rotating member 7 rotates until it moves along the slope 61a and is locked on the locking surface 61c (that is, the rotating member 7 rotates until the pen tip is in a protruding state). As a result, as shown in FIGS. 4 and 5(b), the outward protrusion 72 comes into contact with the convex part 81a from the circumferential direction, and at the same time the pen tip becomes in a protruding state, the outward protrusion 72 and the convex part 81a come into pressure contact in the radial direction. The state will be as follows.

さらに、ペン先突出状態からクリップ体８を前方にスライド操作し、回転部材７の突条７１とカム歯６１の係止面６１ｃとの係合が解除されてから、突条７１後端のカム斜面７１ａが、第２カム斜面６１ｂに沿って移動しカム溝６２に係合されるまでに、回転部材７が回転する（即ちペン先没入状態になるまで回転部材７が回転する）。それにより、図３及び図５（ａ）に示すように、ペン先没入状態になると同時に外向突起７２と凸部８１ａとが非接触状態となる。 Furthermore, the clip body 8 is slid forward from the pen tip protruding state, and after the engagement between the protrusion 71 of the rotating member 7 and the locking surface 61c of the cam tooth 61 is released, the cam at the rear end of the protrusion 71 is released. The rotating member 7 rotates until the slope 71a moves along the second cam slope 61b and is engaged with the cam groove 62 (that is, the rotating member 7 rotates until the pen tip is retracted). As a result, as shown in FIGS. 3 and 5(a), the pen tip enters the retracted state and at the same time the outward protrusion 72 and the convex portion 81a come out of contact.

外向突起７２は回転部材７の外周面に等間隔に偶数個（例えば、４個）が設けられることが好ましい。それにより、何れの外向突起７２の軸心対称位置にも他の外向突起７２が形成される。凸部８１ａと外向突起７２が圧接状態において、凸部８１ａと圧接状態にある外向突起７２の軸心対称位置の他の外向突起７２が、軸筒２の内面に圧接支持され、凸部８１ａと外向突起７２との径方向の確実な圧接が可能となる。 It is preferable that an even number (for example, four) of the outward protrusions 72 are provided on the outer peripheral surface of the rotating member 7 at equal intervals. As a result, other outward protrusions 72 are formed at axially symmetrical positions of any of the outward protrusions 72. When the convex portion 81a and the outward protrusion 72 are in pressure contact, the other outward protrusion 72 located axially symmetrical to the outward protrusion 72 that is in press contact with the convex portion 81a is supported in pressure contact with the inner surface of the shaft cylinder 2, and the convex portion 81a and Reliable pressure contact with the outward projection 72 in the radial direction is possible.

挿入孔４１の前端部には後方に突出する解除壁部４３が一体に形成される。挿入孔４１の前端部には凸部８１ａが乗り上げて摺接可能なガイド溝４４が連設される。ガイド溝４４の底壁が解除壁部４３となる。解除壁部４３の後端には、前方に向かうに従い径方向外方に移動する傾斜面が形成される。ガイド溝４４後端の短手方向の溝幅は挿入孔４１前端の短手方向の溝幅と等しい。 A release wall 43 that projects rearward is integrally formed at the front end of the insertion hole 41 . A guide groove 44 is connected to the front end of the insertion hole 41, on which the convex portion 81a can slide. The bottom wall of the guide groove 44 becomes the release wall portion 43. An inclined surface that moves radially outward toward the front is formed at the rear end of the release wall 43. The groove width in the lateral direction at the rear end of the guide groove 44 is equal to the groove width in the lateral direction at the front end of the insertion hole 41.

ペン先突出状態からペン先没入状態に移行する際に、クリップ体８を前方に押圧操作をし始めると、凸部８１ａが挿入孔４１から一時的にガイド溝４４に挿入されると同時に、凸部８１ａと外向突起７２との間にガイド溝４４の径方向の底壁（解除壁部４３）が挿入される。それにより、凸部８１ａと外向突起７２との圧接状態が容易に解除され、カム部に沿った回転部材の円滑な回転が得られる。 When the clip body 8 is started to be pressed forward when transitioning from the pen tip protruding state to the pen tip recessed state, the protrusion 81a is temporarily inserted into the guide groove 44 from the insertion hole 41, and at the same time the protrusion 81a is inserted into the guide groove 44 from the insertion hole 41. A radial bottom wall (release wall portion 43) of the guide groove 44 is inserted between the portion 81a and the outward projection 72. Thereby, the pressed state between the convex portion 81a and the outward protrusion 72 is easily released, and smooth rotation of the rotating member along the cam portion is obtained.

本実施の形態の出没式筆記具１は、軸筒２内に筆記体１０が前後方向に移動可能に収容され、前記軸筒２の側壁に前後方向に延びるスライド孔２１が形成され、前記スライド孔２１に前後方向に移動可能にクリップ体８が設けられ、ペン先没入状態から前記クリップ体８を前方に押圧操作することにより前記筆記体１０のペン先を前記軸筒２の前端孔３１から突出状態にし、前記ペン先突出状態から前記クリップ体８を前方に押圧操作することにより前記ペン先を没入状態にする出没機構を備えた出没式筆記具であって、前記出没機構が、前記軸筒２内部に形成されたカム部６と、前記カム部６に係合し且つ前記筆記体１０の後端部を支持する回転部材７と、前記回転部材７に回転を付与するカム歯９１と、前記カム歯９１を備え且つ前記スライド孔２１より前記軸筒２の外部に突出する前記クリップ体８と、前記軸筒２内部に収容され且つ前記筆記体１０を後方に付勢する弾発体１１と、を備え、前記クリップ体８と前記回転部材７とが連動して前後方向に移動可能に構成され、前記クリップ体８は、前記軸筒２外部に配置される前後方向に延びるクリップ本体８１を備え、前記クリップ本体８１の径方向の内面に凸部８１ａが形成され、前記スライド孔２１より前方の前記軸筒２の側壁に、径方向に貫通する挿入孔４１が形成され、ペン先突出状態において、前記挿入孔４１に前記クリップ本体８１の凸部８１ａが挿入され且つ前記回転部材７の外面と前記クリップ本体８１の凸部８１ａとが圧接されてなる。前記構成により、筆記時のクリップ体８のがたつきを防止できる。 In the retractable writing instrument 1 of the present embodiment, a writing body 10 is housed in a barrel 2 so as to be movable in the front-rear direction, and a slide hole 21 extending in the front-rear direction is formed in the side wall of the barrel 2. 21 is provided with a clip body 8 movable in the front and back direction, and by pressing the clip body 8 forward from the pen tip retracted state, the pen tip of the writing body 10 is projected from the front end hole 31 of the barrel tube 2. A retractable writing instrument is provided with a retractable mechanism that presses the clip body 8 forward from the pen tip protruding state to retract the pen tip, the retractable mechanism including the barrel 2 a cam portion 6 formed inside, a rotating member 7 that engages with the cam portion 6 and supports the rear end portion of the writing body 10, cam teeth 91 that impart rotation to the rotating member 7; the clip body 8 having cam teeth 91 and protruding from the slide hole 21 to the outside of the barrel 2; the resilient body 11 housed inside the barrel 2 and urging the writing body 10 backward; , the clip body 8 and the rotary member 7 are configured to be movable in the front-back direction in conjunction with each other, and the clip body 8 has a clip body 81 extending in the front-rear direction disposed outside the shaft tube 2. A convex portion 81a is formed on the radially inner surface of the clip main body 81, and an insertion hole 41 penetrating in the radial direction is formed on the side wall of the shaft tube 2 in front of the slide hole 21, so that the pen tip is in a protruding state. In this case, the protrusion 81a of the clip main body 81 is inserted into the insertion hole 41, and the outer surface of the rotating member 7 and the protrusion 81a of the clip main body 81 are pressed against each other. With the above configuration, it is possible to prevent the clip body 8 from shaking during writing.

本実施の形態の出没式筆記具１は、前記回転部材７の外面に複数の外向突起７２が形成され、ペン先没入状態及びペン先突出状態において、前記挿入孔４１に前記凸部８１ａが挿入され、ペン先突出状態において、前記外向突起７２と前記凸部８１ａとが圧接され、ペン先没入状態において、前記凸部８１ａが前記外向突起７２の相互間の回転部材７の外面の径方向外方に配置され且つ前記外向突起７２と前記凸部８１ａとが非接触状態にされてなる。前記構成により、回転部材７とクリップ本体８１の凸部８１ａとが常時圧接することを回避でき、回転部材７の円滑な回転が得られ、その結果、クリップ体８のスムーズな前後の操作性を維持できる。 In the retractable writing instrument 1 of this embodiment, a plurality of outward protrusions 72 are formed on the outer surface of the rotating member 7, and the convex portion 81a is inserted into the insertion hole 41 in the pen tip retracted state and the pen tip protruded state. In the pen tip protruding state, the outward protrusion 72 and the convex portion 81a are pressed together, and in the pen tip retracted state, the convex portion 81a is radially outward of the outer surface of the rotating member 7 between the outward protrusions 72. The outward protrusion 72 and the convex portion 81a are placed in a non-contact state. With the above configuration, it is possible to avoid constant pressure contact between the rotating member 7 and the convex portion 81a of the clip body 81, and to obtain smooth rotation of the rotating member 7. As a result, the clip body 8 can be operated smoothly back and forth. Can be maintained.

本実施の形態の出没式筆記具１は、前記挿入孔４１の前端部に後方に突出する解除壁部４３が形成され、ペン先突出状態からペン先没入状態に移行する過程で、前記解除壁部４３が前記凸部８１ａと前記外向突起７２との間に挿入されることにより、前記凸部８１ａと前記外向突起７２との圧接が解除される。前記構成により、ペン先突出状態からペン先没入状態に移行する際の回転部材７の円滑な回転が得られ、その結果、クリップ体８のスムーズな前後の操作性を維持できる。 In the retractable writing instrument 1 of the present embodiment, a release wall portion 43 that projects rearward is formed at the front end of the insertion hole 41, and in the process of transitioning from the pen tip protruding state to the pen tip recessed state, the release wall portion 43 is inserted between the convex portion 81a and the outward protrusion 72, the pressure contact between the convex portion 81a and the outward protrusion 72 is released. With the above configuration, the rotating member 7 can be smoothly rotated when the pen tip is moved from the protruding state to the retracted state, and as a result, smooth back and forth operability of the clip body 8 can be maintained.

１出没式筆記具
２軸筒
２１スライド孔
３前軸
３１前端孔
４中間軸
４１挿入孔
４２第１の長孔
４３解除壁部
４４ガイド溝
５後軸
５１第２の長孔
６カム部
６１カム歯
６１ａ第１カム斜面
６１ｂ第２カム斜面
６１ｃ係止面
６２カム溝
６３凹溝
７回転部材
７１突条
７１ａカム斜面
７２外向突起
８クリップ体
８１クリップ本体
８１ａ凸部
８２基部
８３軸部
９円筒体
９１カム歯
９２ガイド突起
１０筆記体
１０１ペン先
１０２インキ収容管
１０３尾栓
１１弾発体
１２摩擦体 1 Retractable writing instrument 2 Shaft tube 21 Slide hole 3 Front axis 31 Front end hole
4 Intermediate shaft 41 Insertion hole 42 First elongated hole 43 Release wall portion 44 Guide groove 5 Rear shaft 51 Second elongated hole 6 Cam portion 61 Cam tooth 61a First cam slope 61b Second cam slope 61c Locking surface 62 Cam Groove 63 Groove 7 Rotating member 71 Projection 71a Cam slope 72 Outward protrusion 8 Clip body 81 Clip body 81a Convex portion 82 Base 83 Shaft 9 Cylindrical body 91 Cam tooth 92 Guide protrusion 10 Writing body 101 Pen tip 102 Ink storage tube 103 Tail plug 11 Bullet body 12 Friction body

Claims

A writing body is housed in a barrel so as to be movable in the front and back direction, a slide hole extending in the front and back direction is formed in the side wall of the barrel, a clip body is provided in the slide hole so as to be movable in the front and back direction, and a pen tip is provided in the slide hole. By pressing the clip body forward from the retracted state, the pen tip of the cursive writing is made to protrude from the front end hole of the barrel, and by pressing the clip body forward from the pen tip protruding state, A retractable writing instrument equipped with a retractable mechanism that brings the pen tip into a retractable state,
The protruding and retracting mechanism includes a cam part formed inside the barrel, a rotating member that engages with the cam part and supports the rear end of the writing body, and cam teeth that impart rotation to the rotating member. , the clip body having the cam teeth and protruding from the slide hole to the outside of the barrel; and an elastic body housed inside the barrel and urging the writing body backward;
The clip body and the rotating member are configured to be movable in the front-back direction in conjunction with each other,
The clip body includes a clip body disposed outside the barrel and extending in the front-rear direction, and a convex portion is formed on the inner surface of the clip body in the radial direction,
An insertion hole penetrating in a radial direction is formed in a side wall of the shaft cylinder forward of the slide hole,
A retractable writing instrument characterized in that, when the pen tip is in a protruding state, a convex portion of the clip body is inserted into the insertion hole, and the outer surface of the rotating member and the convex portion of the clip body are pressed against each other.

a plurality of outward protrusions are formed on the outer surface of the rotating member;
The convex portion is inserted into the insertion hole in the pen tip retracted state and the pen tip protruded state,
In the pen tip protruding state, the outward protrusion and the convex portion are in pressure contact,
2. In the pen tip retracted state, the protrusion is arranged radially outward of the outer surface of the rotating member between the outward protrusions, and the outward protrusion and the protrusion are in a non-contact state. A removable writing instrument.

A release wall portion that projects rearward is formed at the front end of the insertion hole, and the release wall portion is inserted between the convex portion and the outward protrusion in the process of transitioning from the pen tip protruding state to the pen tip recessed state. The retractable writing instrument according to claim 2, wherein the pressure contact between the convex portion and the outward protrusion is released by pressing the convex portion and the outward protrusion.