JP6954829B2

JP6954829B2 - Multi-core writing tool

Info

Publication number: JP6954829B2
Application number: JP2017244448A
Authority: JP
Inventors: 嘉人光崎
Original assignee: Pilot Corp KK
Current assignee: Pilot Corp KK
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2021-10-27
Anticipated expiration: 2037-12-20
Also published as: JP2019111659A

Description

本発明は、多芯筆記具に関する。特には、軸筒内に複数の筆記体を収容することができる多芯筆記具に関する。 The present invention relates to a multi-core writing instrument. In particular, the present invention relates to a multi-core writing instrument capable of accommodating a plurality of cursive bodies in a barrel.

特許文献１には、軸筒に対し前後方向に摺動して該軸筒の開口部から筆記体の筆記部を繰り出す多芯筆記具が開示されている。各筆記体の先端部外周に環状部材が配設されていて、筆記部が出没する軸筒先端の開口部周辺の内側面に、環状部材が当接する略球面状の内面が形成されている。環状部材は、筆記体に対してスプリングを介して固定されていて、前方に向けて付勢されている。筆記部が繰り出されると、スプリングの弾発力によって環状部材が軸筒先端の内側面に密着される。これにより、筆記時にガタつく事を防止することができる。 Patent Document 1 discloses a multi-core writing instrument that slides in the front-rear direction with respect to a barrel and extends the writing portion of the cursive from the opening of the barrel. An annular member is arranged on the outer periphery of the tip of each cursive, and a substantially spherical inner surface with which the annular member abuts is formed on the inner surface around the opening at the tip of the barrel where the writing portion appears and disappears. The annular member is fixed to the cursive via a spring and is urged forward. When the writing portion is extended, the elastic force of the spring causes the annular member to come into close contact with the inner surface of the tip of the barrel. This makes it possible to prevent rattling during writing.

特開２０１３−２２０６０２JP 2013-220602

特許文献１に開示された技術では、筆記時のガタツキを防止する効果を高めるためには、環状部材の内面と筆記部の外周面との間の寸法関係を適切に管理する必要がある。例えば、筆記部の外周面と軸筒の先端部内面との間の隙間寸法より筆記部の外周面と環状部材の内面との間の隙間寸法の方が大きければ、筆記時のガタツキを防止する効果を得られない。このため、高い寸法精度が要求され、生産性の点で問題がある。 In the technique disclosed in Patent Document 1, in order to enhance the effect of preventing rattling during writing, it is necessary to appropriately manage the dimensional relationship between the inner surface of the annular member and the outer peripheral surface of the writing portion. For example, if the gap between the outer peripheral surface of the writing portion and the inner surface of the tip of the barrel is larger than the gap between the outer peripheral surface of the writing portion and the inner surface of the annular member, rattling during writing is prevented. No effect. Therefore, high dimensional accuracy is required, and there is a problem in terms of productivity.

本発明は、以上のような知見に鑑みてなされたものであり、その目的とするところは、筆記時にチップのガタつきが防止されて安定した筆記感が得られる一方、高い精度の部品寸法管理を必要としない多芯筆記具を提供することである。 The present invention has been made in view of the above findings, and an object of the present invention is to prevent rattling of the tip during writing and obtain a stable writing feeling, while highly accurate component dimensional control. Is to provide a multi-core writing instrument that does not require.

本発明は、前端に開口を有する軸筒と、前記軸筒の内部に収容され、前記軸筒の軸方向に移動可能な複数のチップホルダーと、各チップホルダーの前端に固定され、当該チップホルダーの移動に伴って前記軸筒の前記開口から出没可能なチップと、前記複数のチップホルダーのうちの１つのチップホルダーの前端側への移動に伴って当該１つのチップホルダーまたは当該１つのチップホルダーに固定されたチップの外周に遊嵌可能であって、当該遊嵌時において当該１つのチップホルダーまたは当該チップに対して当該１つのチップホルダーまたは当該チップの軸方向に移動可能な環状部材と、前記環状部材に弾性部材を介して接続され、前記１つのチップホルダーの前端側への移動に伴って当該１つのチップホルダーに当接可能な環状カラーと、前記環状カラーを前記軸筒の内面に支持する第２弾性部材と、を備え、前記環状部材の外周の少なくとも一部には、前記１つのチップホルダーの前端側への移動に伴って前記環状カラー及び前記弾性部材を介して前記環状部材が前端側へ移動する際、前記軸筒の内面の一部に当接する当接面が形成されており、前記環状部材の一部には、切欠きが形成されており、前記当接面において荷重を受ける時に当該環状部材の内径が縮径するようになっており、前記軸筒の内面の一部には、前記１つのチップホルダーの前端側への移動に伴って前記当接面が当接する案内面が形成されており、前記当接面は、前記１つのチップホルダーの前端側への移動に伴って前記環状カラー及び前記弾性部材を介して前記環状部材が前端側へ移動する際、前記案内面から前記荷重を受けるようになっていることを特徴とする多芯筆記具である。 The present invention includes a shaft cylinder having an opening at the front end, a plurality of chip holders housed inside the shaft cylinder and movable in the axial direction of the shaft cylinder, and a chip holder fixed to the front end of each chip holder. A tip that can appear and disappear from the opening of the barrel with the movement of the tip holder, and the one tip holder or the one tip holder with the movement of one of the plurality of tip holders toward the front end side. An annular member that can be loosely fitted to the outer periphery of the chip fixed to the chip and is movable in the axial direction of the one chip holder or the chip with respect to the chip at the time of the loose fitting. An annular collar that is connected to the annular member via an elastic member and can come into contact with the one chip holder as it moves toward the front end side of the one chip holder, and the annular collar on the inner surface of the axle tube. A second elastic member is provided, and at least a part of the outer periphery of the annular member is covered with the annular member via the annular collar and the elastic member as the tip holder moves toward the front end side. Is formed on a contact surface that comes into contact with a part of the inner surface of the barrel when the shaft moves to the front end side, and a notch is formed on a part of the annular member. The inner diameter of the annular member is reduced when a load is applied, and the contact surface is applied to a part of the inner surface of the barrel as the one tip holder moves toward the front end side. A guide surface in contact is formed, and the contact surface is formed when the annular member moves toward the front end side via the annular collar and the elastic member as the one chip holder moves toward the front end side. It is a multi-core writing tool characterized in that the load is received from the guide surface.

本発明によれば、チップホルダーの前端側への移動に伴って環状カラー及び弾性部材を介して環状部材が前端側へ移動し、環状部材の当接部が軸筒の案内面から荷重を受けることによって環状部材の切欠きの存在によって環状部材の内径が縮径する。これにより、軸筒と環状部材とが協働してチップまたはチップホルダーをガタつき（遊び）の無い態様で把持することができる。更に、チップホルダーが当接する環状カラーと環状部材とが弾性部材を介して接続されていることにより、環状部材の内径の縮径の程度等について高精度の寸法管理をしなくても、チップまたはチップホルダーをガタつき（遊び）の無い態様で効果的に把持することを保証できる。 According to the present invention, as the tip holder moves to the front end side, the annular member moves to the front end side via the annular collar and the elastic member, and the contact portion of the annular member receives a load from the guide surface of the axle cylinder. As a result, the inner diameter of the annular member is reduced due to the presence of the notch in the annular member. As a result, the barrel and the annular member can cooperate to grip the insert or the insert holder in a manner without rattling (play). Further, since the annular collar and the annular member with which the chip holder abuts are connected via the elastic member, the insert or the insert can be used without high-precision dimensional control regarding the degree of reduction of the inner diameter of the annular member. It is possible to guarantee that the tip holder is effectively gripped in a manner without rattling (play).

好ましくは、前記切欠きは、前記環状部材の周方向に等間隔に複数が配置されており、前記複数の切欠きの各々は、前記環状部材の軸方向に延びるスリットである。この場合、環状部材の内径が周方向にバランス良く縮径することができる。 Preferably, a plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member, and each of the plurality of notches is a slit extending in the axial direction of the annular member. In this case, the inner diameter of the annular member can be reduced in a well-balanced manner in the circumferential direction.

前記当接面は、前端に向かって先細状であることが好ましく、前記案内面も、前端に向かって先細状であることが好ましい。前記当接面は、例えば切頭円錐面を有していることが好ましい。この場合、前記案内面は、対応する凹切頭円錐面であることが好ましい。あるいは、前記当接面は、軸線周りに回転対称な凸曲面を有していることが好ましい。この場合、前記案内面は、軸線周りに回転対称であって前記凸曲面の曲率よりも緩やかな曲率の凹曲面または凹切頭円錐面であることが好ましい。 The contact surface is preferably tapered toward the front end, and the guide surface is also preferably tapered toward the front end. The contact surface preferably has, for example, a truncated conical surface. In this case, the guide surface is preferably a corresponding concave-headed conical surface. Alternatively, the contact surface preferably has a convex curved surface that is rotationally symmetric around the axis. In this case, the guide surface is preferably a concave curved surface or a concave truncated conical surface that is rotationally symmetric about the axis and has a curvature gentler than the curvature of the convex curved surface.

また、好ましくは、前記弾性部材は、軸方向に垂直な方向に延びるスリットが多数形成された筒状の樹脂バネ部材である。この場合、更に、環状部材と樹脂バネ部材と環状カラーとが同一樹脂材料から一体成形されていることが好ましい。 Further, preferably, the elastic member is a tubular resin spring member in which a large number of slits extending in a direction perpendicular to the axial direction are formed. In this case, it is further preferable that the annular member, the resin spring member, and the annular collar are integrally molded from the same resin material.

また、前記複数のチップホルダーの一つは、摩擦部材をチップとして保持していることが好ましい。摩擦部材とは、消しゴムや、熱変色性筆記具用の摩擦熱発生用ラバー（消去用ラバー）である。この場合、筆跡消去時に摩擦部材がガタつく事を防止することができ、より安定した筆跡消去感が得られる。 Further, it is preferable that one of the plurality of tip holders holds the friction member as a tip. The friction member is an eraser or a rubber for generating frictional heat (rubber for erasing) for a heat-discoloring writing tool. In this case, it is possible to prevent the friction member from rattling during handwriting erasing, and a more stable handwriting erasing feeling can be obtained.

また、本発明は、以上の多芯筆記具の軸筒のみをも対象とするものである。すなわち、本発明は、前端にチップが固定された複数のチップホルダーを軸方向に移動可能に収容可能であって、前端に開口を有し、前記複数のチップホルダーのうちの１つのチップホルダーの移動に伴って当該１つのチップホルダーに固定されたチップを前記開口から出没させることが可能な多芯筆記具用の軸筒であって、前記１つのチップホルダーの前端側への移動に伴って当該１つのチップホルダーまたは当該１つのチップホルダーに固定されたチップの外周に遊嵌可能であって、当該遊嵌時において当該１つのチップホルダーまたは当該チップに対して当該１つのチップホルダーまたは当該チップの軸方向に移動可能な環状部材と、前記環状部材に弾性部材を介して接続され、前記１つのチップホルダーの前端側への移動に伴って当該１つのチップホルダーに当接可能な環状カラーと、前記環状カラーを当該軸筒の内面に支持する第２弾性部材と、を備え、前記環状部材の外周の少なくとも一部には、前記１つのチップホルダーの前端側への移動に伴って前記環状カラー及び前記弾性部材を介して前記環状部材が前端側へ移動する際、前記軸筒の内面の一部に当接する当接面が形成されており、前記環状部材の一部には、切欠きが形成されており、前記当接面において荷重を受ける時に当該環状部材の内径が縮径するようになっており、前記軸筒の内面の一部には、前記１つのチップホルダーの前端側への移動に伴って前記当接面が当接する案内面が形成されており、前記当接面は、前記１つのチップホルダーの前端側への移動に伴って前記環状カラー及び前記弾性部材を介して前記環状部材が前端側へ移動する際、前記案内面から前記荷重を受けるようになっていることを特徴とする多芯筆記具用の軸筒である。 Further, the present invention also covers only the shaft cylinder of the above-mentioned multi-core writing instrument. That is, the present invention can accommodate a plurality of chip holders having chips fixed to the front end so as to be movable in the axial direction, and has an opening at the front end of the chip holder of one of the plurality of chip holders. A shaft tube for a multi-core writing tool capable of causing a tip fixed to the one tip holder to appear and disappear from the opening as the tip holder moves, and the tip holder moves toward the front end side of the tip holder. It can be loosely fitted to the outer periphery of one chip holder or a chip fixed to the one chip holder, and at the time of the loose fitting, the one chip holder or the chip can be fitted to the one chip holder or the chip. An annular member that can move in the axial direction, an annular collar that is connected to the annular member via an elastic member and that can come into contact with the one chip holder as it moves toward the front end side of the one chip holder. A second elastic member that supports the annular collar on the inner surface of the axle tube is provided, and at least a part of the outer periphery of the annular member is covered with the annular collar as the one tip holder moves toward the front end side. And when the annular member moves to the front end side via the elastic member, a contact surface is formed that comes into contact with a part of the inner surface of the axle cylinder, and a notch is formed in a part of the annular member. It is formed so that the inner diameter of the annular member is reduced when a load is applied to the contact surface, and a part of the inner surface of the shaft cylinder is provided with the front end side of the one tip holder. A guide surface is formed with which the contact surface comes into contact with the movement, and the contact surface is formed via the annular collar and the elastic member with the movement of the one chip holder toward the front end side. It is a shaft cylinder for a multi-core writing tool, characterized in that when the annular member moves to the front end side, the load is received from the guide surface.

本発明の一実施形態における多芯筆記具の概略縦断面図であって、全てのチップ（筆記体）が突出していない状態を示す図である。It is a schematic vertical sectional view of the multi-core writing instrument in one Embodiment of this invention, and is the figure which shows the state in which all the chips (cursive) are not protruding. 図１の多芯筆記具の先端部分の拡大縦断面図である。It is an enlarged vertical sectional view of the tip part of the multi-core writing instrument of FIG. 図２のＡ−Ａ線断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 図４（ａ）は、図１の多芯筆記具の環状部材と弾性部材とカラー部材の斜視図である。図４（ｂ）は、図４（ａ）の環状部材と弾性部材とカラー部材の側面図である。図４（ｃ）は、図４（ｂ）のＣ−Ｃ線断面図である。図４（ｄ）は、図４（ａ）の環状部材と弾性部材とカラー部材の正面図（先端側から見た図）である。図４（ｅ）は、図４（ａ）の環状部材と弾性部材とカラー部材の背面図である。FIG. 4A is a perspective view of the annular member, the elastic member, and the collar member of the multi-core writing instrument of FIG. FIG. 4B is a side view of the annular member, the elastic member, and the collar member of FIG. 4A. FIG. 4 (c) is a cross-sectional view taken along the line CC of FIG. 4 (b). FIG. 4D is a front view (viewed from the tip side) of the annular member, the elastic member, and the collar member of FIG. 4A. FIG. 4 (e) is a rear view of the annular member, the elastic member, and the collar member of FIG. 4 (a). 図１の多芯筆記具の概略縦断面図であって、一つのチップ（筆記体）が突出している状態を示す図である。It is a schematic vertical sectional view of the multi-core writing instrument of FIG. 1, and is the figure which shows the state which one chip (cursive) protrudes. 図５の多芯筆記具の先端部分の拡大縦断面図である。FIG. 5 is an enlarged vertical sectional view of a tip portion of the multi-core writing instrument of FIG. 図６のＢ−Ｂ線断面図である。FIG. 6 is a cross-sectional view taken along the line BB of FIG.

以下、図面を参照して本発明の一実施の形態について説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態における多芯筆記具１０１の概略縦断面図であって、全てのチップ（筆記体）が突出していない状態を示す図である。一方、図５は、図１の多芯筆記具１０１の概略縦断面図であって、筆記体の一例であるボールペンチップが突出している状態を示す図である。 FIG. 1 is a schematic vertical sectional view of a multi-core writing instrument 101 according to an embodiment of the present invention, showing a state in which all chips (cursives) do not protrude. On the other hand, FIG. 5 is a schematic vertical cross-sectional view of the multi-core writing instrument 101 of FIG. 1, showing a state in which a ballpoint pen tip, which is an example of a cursive, is projected.

図１及び図５に示すように、本実施形態の多芯筆記具１０１は、先細状の円筒体からなる前軸１０３と、当該前軸１０３の後端部と螺合または圧入により取り付けられる円筒状の後軸１０４と、からなる軸筒１０２を備えている。前軸１０３の前端には、筆記体１０６のチップ１６１が突出可能な開口１３１が軸方向に貫設されている。前軸１０３及び後軸１０４は、合成樹脂（例えば、ポリカーボネイト等）または金属により形成される。 As shown in FIGS. 1 and 5, the multi-core writing tool 101 of the present embodiment has a cylindrical shape that is screwed or press-fitted to a front shaft 103 formed of a tapered cylindrical body and a rear end portion of the front shaft 103. It includes a rear shaft 104 and a shaft cylinder 102 composed of the rear shaft 104. At the front end of the front shaft 103, an opening 131 through which the tip 161 of the cursive 106 can protrude is formed in the axial direction. The front axle 103 and the rear axle 104 are made of synthetic resin (for example, polycarbonate or the like) or metal.

後軸１０４の後部の側壁には、例えば５本（２〜６本から選択され得る）の前後方向に延びる細長状の窓孔１４１（図５参照）が、径方向に貫設されている。５本の窓孔１４１は、例えば、周方向に等間隔に形成されている。 On the rear side wall of the rear shaft 104, for example, five elongated window holes 141 (see FIG. 5) extending in the front-rear direction (which can be selected from 2 to 6) are pierced in the radial direction. The five window holes 141 are formed, for example, at equal intervals in the circumferential direction.

後軸１０４の５本の窓孔１４１の内側の軸心側の領域には、前後方向に延びるリリースバー１４３が延出されている。リリースバー１４３の前方端は、後述するスプリング支持体１０９に支持されている。一方、後軸１０４の５本の窓孔１４１の相互間の側壁内面には、前後方向に延びる係止壁部１４３ａが形成されており、当該係止壁部１４３ａは、ペン先が突出した状態の筆記体１０６の操作体１０７の後端を係止できるようになっている。そして、ペン先が突出した状態の筆記体１０６の操作体１０７の後端が当該係止壁部１４３ａに係止されている際において、代わりに他の筆記体１０６を突出させるべく当該他の筆記体１０６の操作体１０７が前方に移動される時に、当該他の筆記体１０６の操作体１０７がリリースバー１４３を径方向外方に押圧し、当該押圧されたリリースバー１４３が前記係止壁部１４３ａに係止されていた操作体１０７の後端を径方向外方に押圧してその係止状態を解除するようになっている。その他、後軸１０４の５本の窓孔１４１の相互間の側壁外面の一カ所に、クリップ１４４が設けられている。 A release bar 143 extending in the front-rear direction extends in a region on the inner axis side of the five window holes 141 of the rear shaft 104. The front end of the release bar 143 is supported by a spring support 109, which will be described later. On the other hand, a locking wall portion 143a extending in the front-rear direction is formed on the inner surface of the side wall between the five window holes 141 of the rear shaft 104, and the locking wall portion 143a has a pen tip protruding from the locking wall portion 143a. The rear end of the operating body 107 of the writing body 106 can be locked. Then, when the rear end of the operating body 107 of the cursive 106 with the pen tip protruding is locked to the locking wall portion 143a, the other writing is made so that the other cursive 106 is projected instead. When the operating body 107 of the body 106 is moved forward, the operating body 107 of the other cursive 106 presses the release bar 143 outward in the radial direction, and the pressed release bar 143 presses the locking wall portion. The rear end of the operating body 107 locked to the 143a is pressed outward in the radial direction to release the locked state. In addition, a clip 144 is provided at one place on the outer surface of the side wall between the five window holes 141 of the rear shaft 104.

後軸１０４の後端部には、当該後端部を開閉自在にする蓋部１０５が回動自在に設けられている。蓋部１０５の一端部は、例えば、クリップ１４４基部に、ヒンジ部により回動自在に接続され得る。ヒンジ部は、例えば、ペン先下向きでクリップ１４４を正面視したときのクリップ１４４の左右方向に延設され得る。この場合、蓋部１０５は、略前後方向に回動自在であり得る。 A lid 105 that allows the rear end to be opened and closed is rotatably provided at the rear end of the rear shaft 104. One end of the lid 105 can be rotatably connected to, for example, the base of the clip 144 by a hinge. The hinge portion can be extended in the left-right direction of the clip 144 when the clip 144 is viewed from the front with the pen tip facing downward, for example. In this case, the lid 105 may be rotatable in the substantially front-rear direction.

蓋部１０５の前面には、当接壁部が形成されている。当該当接壁部に、没入状態の筆記体１０６の後端に連結された操作体１０７の後端が、衝止されるようになっている（図１参照）。ヒンジ部としては、典型的には、回動軸により回動自在に接続される構成が採用され得るが、当該態様以外にも、屈曲変形可能な可撓性を有する連結部等も採用され得る。 A contact wall portion is formed on the front surface of the lid portion 105. The rear end of the operating body 107 connected to the rear end of the immersive cursive 106 is abutted against the contact wall (see FIG. 1). As the hinge portion, a configuration in which the hinge portion is rotatably connected by a rotating shaft can be typically adopted, but in addition to this embodiment, a connecting portion having flexibility that can be bent and deformed can also be adopted. ..

そして、例えば、蓋部１０５の他端部の前面には、係合部が設けられ（例えば係合凹部または係合孔部）、後軸１０４の後端には、当該係合部と係合可能な被係合部が設けられ得る（例えば係合凸部）。更に詳細には、係合部（係合凹部または係合孔部）の内面に内向突起が形成され得て、被係合部（係合凸部）の外面に前記内向突起と乗り越え係止可能な外向突起が形成され得る。 Then, for example, an engaging portion is provided on the front surface of the other end of the lid 105 (for example, an engaging recess or an engaging hole), and the rear end of the rear shaft 104 engages with the engaging portion. Possible engaged portions may be provided (eg, engaging protrusions). More specifically, an inward protrusion may be formed on the inner surface of the engaging portion (engagement concave portion or engagement hole portion), and the inward projection can be overcome and locked on the outer surface of the engaged portion (engagement convex portion). Extraverted protrusions can be formed.

この場合、係合部と被係合部とは、蓋部１０５が後端開口部を閉鎖している間、互いに係合状態にある（内向突起と外向突起が乗り越え係止状態にある）。その係合状態は、後述するコイルスプリング１０８の後方への付勢による操作体１０７と蓋部１０５の当接壁部との当接では解除されず、蓋部１０５が開くことはない。 In this case, the engaged portion and the engaged portion are in an engaged state with each other while the lid portion 105 closes the rear end opening (the inward protrusion and the outward protrusion are in a locked state overcoming). The engaged state is not released by the contact between the operating body 107 and the contact wall portion of the lid portion 105 due to the rearward urging of the coil spring 108, which will be described later, and the lid portion 105 does not open.

各々の操作体１０７は、特には図５に示すように、操作部１７１と、前側突出部１７２と、後側突出部１７３と、嵌入部１７４と、鍔部１７５と、を有している。操作部１７１は、操作体１０７の後端部に形成され、且つ、軸筒１０２の窓孔１４１から外部に突出される。後側突出部１７３は、操作体１０７の操作部１７１の反対側（軸心側）に設けられ、前側突出部１７２は、後側突出部１７３の前方に設けられ、嵌入部１７４は、操作体１０７の前端部に形成され且つインキ収容筒体を兼ねるチップホルダー１６３の後端開口部に嵌入されている。鍔部１７５は、嵌入部１７４の後方近傍に形成されており、鍔部１７５の前面は、コイルスプリング１０８の後端を押圧している。 Each operating body 107 has an operating portion 171, a front protruding portion 172, a rear protruding portion 173, a fitting portion 174, and a flange portion 175, as shown in FIG. The operation unit 171 is formed at the rear end of the operation body 107, and projects outward from the window hole 141 of the barrel 102. The rear protruding portion 173 is provided on the opposite side (axial side) of the operating portion 171 of the operating body 107, the front protruding portion 172 is provided in front of the rear protruding portion 173, and the fitting portion 174 is the operating body. It is fitted in the rear end opening of the chip holder 163 formed at the front end portion of 107 and also serving as an ink storage cylinder. The collar portion 175 is formed in the vicinity of the rear side of the fitting portion 174, and the front surface of the collar portion 175 presses the rear end of the coil spring 108.

また、操作体１０７の両方の側面に係止突起（図示せず）が形成されており、当該係止突起は窓孔１４１の両側壁に抜け止め係合可能となっている。操作体１０７は、合成樹脂（例えば、ポリプロピレン樹脂、ＡＢＳ樹脂、ポリアセタール樹脂等）の成形体により得られる。 Further, locking protrusions (not shown) are formed on both side surfaces of the operating body 107, and the locking protrusions can be engaged with each other on both side walls of the window hole 141. The operating body 107 is obtained by molding a synthetic resin (for example, polypropylene resin, ABS resin, polyacetal resin, etc.).

筆記体１０６のチップ１６１が没入状態であるとき、当該筆記体１０６に取り付けられた操作体１０７の後端部は、当接壁部に衝止された状態となるようになっている(図１参照）。一方、筆記体１０６のチップ１６１が突出状態であるとき、当該筆記体１０６に取り付けられた操作体１０７の後側突出部１７３が、軸筒１０２の内部に形成された係止壁部１４３ａに係止された状態となるようになっている（図５参照）。 When the tip 161 of the cursive 106 is in an immersive state, the rear end portion of the operating body 107 attached to the cursive 106 is in a state of being abutted by the contact wall portion (FIG. 1). reference). On the other hand, when the tip 161 of the cursive 106 is in the protruding state, the rear protruding portion 173 of the operating body 107 attached to the cursive 106 engages with the locking wall portion 143a formed inside the barrel 102. It is in a stopped state (see FIG. 5).

また、チップ没入状態にある筆記体１０６に連結された操作体１０７の前側突出部１７２は、その操作体１０７の操作部１７１が前方にスライド操作される際、先に突出状態にある他の筆記体１０６があれば、当該他の筆記体１０６に連結された操作体１０７の後側突出部１７３が当接しているリリースバー１４３を押圧して当該後側突出部１７３と係止壁部１４３ａとの係止状態を解除する、すなわち、当該他の筆記体１０６のチップ突出状態を解除するようになっている。 Further, the front protruding portion 172 of the operating body 107 connected to the cursive 106 in the chip-immersed state is another writing that is in the protruding state first when the operating portion 171 of the operating body 107 is slid forward. If there is a body 106, the rear protruding portion 173 of the operating body 107 connected to the other cursive 106 presses the release bar 143 in contact with the rear protruding portion 173 and the locking wall portion 143a. The locked state of the cursive is released, that is, the chip protruding state of the other cursive 106 is released.

一方、軸筒１０２の内部（後軸１０４の内部）には、円筒状のスプリング支持体１０９が設けられている。スプリング支持体１０９には、各筆記体１０６がそれぞれ挿通される５個の内孔が軸方向に貫設されている。そして、スプリング支持体１０９の後面側に、各内孔に対応して、コイルスプリング１０８が配置されている。筆記体１０６は、各内孔１９１及び各コイルスプリング１０８の内部に遊挿され、操作体１０７の鍔部１７５の前面がコイルスプリング１０８の後端を押圧している。 On the other hand, a cylindrical spring support 109 is provided inside the axle tube 102 (inside the rear axle 104). The spring support 109 is provided with five inner holes through which each cursive 106 is inserted in the axial direction. A coil spring 108 is arranged on the rear surface side of the spring support 109 corresponding to each inner hole. The cursive 106 is loosely inserted inside each inner hole 191 and each coil spring 108, and the front surface of the flange portion 175 of the operating body 107 presses the rear end of the coil spring 108.

より詳細には、スプリング支持体１０９の後端面に、各内孔に対応して、筒状の凹部が形成されている。そして、各凹部に、各コイルスプリング１０８の前端部外面が圧入保持されている。これにより、筆記体１０６（及び操作体１０７）を交換する際、当該交換作業につられてコイルスプリング１０８が脱落してしまうことが防止されている。 More specifically, a cylindrical recess is formed on the rear end surface of the spring support 109 corresponding to each inner hole. Then, the outer surface of the front end portion of each coil spring 108 is press-fitted and held in each recess. As a result, when the cursive 106 (and the operating body 107) is replaced, the coil spring 108 is prevented from falling off due to the replacement work.

各コイルスプリング１０８は、各々の操作体１０７（即ち各々の筆記体１０６）を、常時、後方に付勢している。すなわち、各コイルスプリング１０８は、チップ突出状態及びチップ没入状態のいずれにおいても、圧縮状態（即ち筆記体１０６が後方に付勢された状態）を維持している。これにより、操作体１０７の前後のがたつきが防止されている。但し、各コイルスプリング１０８は、その内部に筆記体１０６が挿通されていない状態（例えば筆記体の交換作業中の状態）では、非圧縮状態（フリー状態）となるようになっている。 Each coil spring 108 constantly urges each operating body 107 (ie, each cursive 106) backwards. That is, each coil spring 108 maintains a compressed state (that is, a state in which the cursive 106 is urged rearward) in both the chip protruding state and the chip immersion state. As a result, rattling in the front and rear of the operating body 107 is prevented. However, each coil spring 108 is in an uncompressed state (free state) when the cursive body 106 is not inserted inside the coil spring 108 (for example, in a state where the cursive body is being replaced).

続いて、図２は、図１の多芯筆記具１０１の先端部分の拡大縦断面図であり、図３は、図２のＡ−Ａ線断面図である。また、図４（ａ）は、図１の多芯筆記具１０１の環状部材１３５と弾性部材１３４とカラー部材１３３の斜視図であり、図４（ｂ）は、当該環状部材１３５と弾性部材１３４とカラー部材１３３の側面図であり、図４（ｃ）は、図４（ｂ）のＣ−Ｃ線断面図であり、図４（ｄ）は、当該環状部材１３５と弾性部材１３４とカラー部材１３３の正面図（先端側から見た図）であり、図４（ｅ）は、当該環状部材１３５と弾性部材１３４とカラー部材１３３の背面図である。 Subsequently, FIG. 2 is an enlarged vertical sectional view of a tip portion of the multi-core writing tool 101 of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. 4 (a) is a perspective view of the annular member 135, the elastic member 134, and the collar member 133 of the multi-core writing tool 101 of FIG. 1, and FIG. 4 (b) shows the annular member 135 and the elastic member 134. It is a side view of the color member 133, FIG. 4 (c) is a sectional view taken along line CC of FIG. 4 (b), and FIG. 4 (d) shows the annular member 135, the elastic member 134, and the color member 133. 4 (e) is a front view (viewed from the tip side) of the above, and FIG. 4 (e) is a rear view of the annular member 135, the elastic member 134, and the collar member 133.

図１、図２、図５及び図６に示すように、本実施形態の多芯筆記具１０１には、複数のチップホルダー（インキ収容筒体）１６３のうちの１つのチップホルダー１６３の前端側への移動に伴って当該１つのチップホルダー１６３に固定されたチップ１６１の外周に遊嵌可能であって、当該遊嵌時において当該チップ１６１に対して当該チップ１６１の軸方向に移動可能な環状部材１３５（例えばポリアセタール製）が設けられている。 As shown in FIGS. 1, 2, 5 and 6, the multi-core writing tool 101 of the present embodiment has a tip holder 163 of one of a plurality of tip holders (ink storage cylinders) 163 toward the front end side. An annular member that can be loosely fitted to the outer periphery of the tip 161 fixed to the one tip holder 163 with the movement of the tip 161 and can move in the axial direction of the tip 161 with respect to the tip 161 at the time of the loose fitting. 135 (for example, made of polyacetal) is provided.

特に図４（ａ）及び図４（ｃ）に示すように、環状部材１３５の外周の前方側領域には、前端に向かって先細状の当接面として切頭円錐面状の当接面１３５ｔが形成されている。当該当接面１３５ｔの後方側には、円筒部１３５ａが連続して設けられ、更にその後方側に、円筒部１３５ａと同径の筒状の樹脂バネ部１３４が一体成形されている。本実施形態では、樹脂バネ部１３４の内径は、当接面１３５ｔに対応する部位の内径と同一である。 In particular, as shown in FIGS. 4A and 4C, the front region of the outer circumference of the annular member 135 has a truncated conical contact surface 135t as a tapered contact surface toward the front end. Is formed. A cylindrical portion 135a is continuously provided on the rear side of the contact surface 135t, and a tubular resin spring portion 134 having the same diameter as the cylindrical portion 135a is integrally molded on the rear side thereof. In the present embodiment, the inner diameter of the resin spring portion 134 is the same as the inner diameter of the portion corresponding to the contact surface 135t.

樹脂バネ部材１３４は、軸方向に垂直な方向に延びるスリット１３４ｓが複数形成されており、軸方向に伸縮可能となっている。具体的には、図２、図４（ａ）及び図４（ｃ）に示すように、本実施形態の樹脂バネ部材１３４は、上下に向き合う略半円状のスリット１３４ｓの対と、左右に向き合う略半円状のスリット１３４ｓの対とが、軸方向に１対毎に交互に、それぞれ２対及び１対形成されている。対をなすスリット１３４ｓ同士の間の残部は、リブ１３４ｂと呼ばれている。また、本実施形態では、各スリット１３４ｓの幅（軸方向長さ）は均一で、軸方向に隣接するスリット１３４ｓ間の軸方向間隔も均一で、両者は同一である。もっとも、これらの寸法上の関係は、所望の弾性程度を実現するべく、後述のように適宜に調整され得る。 The resin spring member 134 is formed with a plurality of slits 134s extending in a direction perpendicular to the axial direction, and can be expanded and contracted in the axial direction. Specifically, as shown in FIGS. 2, 4 (a) and 4 (c), the resin spring member 134 of the present embodiment has a pair of substantially semicircular slits 134s facing up and down and left and right. Two pairs and one pair of substantially semicircular slits 134s facing each other are formed alternately one by one in the axial direction, respectively. The remainder between the paired slits 134s is called the rib 134b. Further, in the present embodiment, the width (axial length) of each slit 134s is uniform, and the axial distance between the slits 134s adjacent in the axial direction is also uniform, and both are the same. However, these dimensional relationships can be appropriately adjusted as described below in order to achieve the desired degree of elasticity.

樹脂バネ部材１３４の更に基端側には、カラー部材１３３が一体成形されている。カラー部材１３３は、特に図４（ｃ）に示すように、全体的には先細状の円筒体からなり、後端部に大径の後端カラー部１３３ｂが設けられている。後端カラー部１３３ｂは、図２に示すように、コイルバネ１３２を介して前軸１０３の内面に固定されている。また、本実施形態のカラー部材１３３には、コイルバネ１３２と後端カラー部１３３ｂとの固定を補助するために、バネ固定補助部１３３ｆが設けられている。 A collar member 133 is integrally molded on the base end side of the resin spring member 134. As shown in FIG. 4C, the collar member 133 is entirely formed of a tapered cylindrical body, and a large-diameter rear end collar portion 133b is provided at the rear end portion. As shown in FIG. 2, the rear end collar portion 133b is fixed to the inner surface of the front shaft 103 via a coil spring 132. Further, the collar member 133 of the present embodiment is provided with a spring fixing auxiliary portion 133f in order to assist the fixing of the coil spring 132 and the rear end collar portion 133b.

すなわち、カラー部材１３３は、基端側（後端側）から先端側に向かって、後端カラー部１３３ｂ、バネ固定補助部１３３ｆ、本体部１３３ａ及び先細部１３３ｔを当該順序で有している。後端カラー部１３３ｂ、バネ固定補助部１３３ｆ及び本体部１３３ａは、本実施形態ではいずれも円筒形状の部位であり、それらの断面直径の相互関係は、後端カラー部１３３ｂ＞バネ固定補助部１３３ｆ＞本体部１３３ａとなっている。 That is, the collar member 133 has a rear end collar portion 133b, a spring fixing auxiliary portion 133f, a main body portion 133a, and a tip detail 133t in this order from the base end side (rear end side) to the front end side. The rear end collar portion 133b, the spring fixing auxiliary portion 133f, and the main body portion 133a are all cylindrical portions in the present embodiment, and the mutual relationship between their cross-sectional diameters is such that the rear end collar portion 133b> the spring fixing auxiliary portion 133f. > The main body is 133a.

また、図２及び図４（ｃ）に示すように、先細部１３３ｔの内面側には、チップ１６１の後端部に対して大径である（段差を有する）チップホルダー１６３（インキ収容筒体）の前端部が当接するための拡径部１３３ｅが設けられている。これにより、チップホルダー１６３が前端側へ移動される際、当該チップホルダー１６３の前端部が拡径部１３３ｅに当接し、コイルバネ１３２を圧縮しながらカラー部材１３３を前端側へと押圧するようになっている。 Further, as shown in FIGS. 2 and 4 (c), on the inner surface side of the tip detail 133t, a chip holder 163 (ink containing cylinder) having a large diameter (having a step) with respect to the rear end portion of the chip 161 is provided. ) Is provided with an enlarged diameter portion 133e for contacting the front end portion. As a result, when the tip holder 163 is moved to the front end side, the front end portion of the tip holder 163 comes into contact with the enlarged diameter portion 133e and presses the collar member 133 toward the front end side while compressing the coil spring 132. ing.

そして、本実施形態の環状部材１３５には、切欠きとして、４本のスリット１３５ｓが設けられている。図４（ａ）に示すように、４本のスリット１３５ｓは、環状部材１３５の周方向に等間隔に（９０°おきに）配置されている。また、４本のスリット１３５ｓは、いずれも、環状部材１３５の軸方向に前端から円筒部１３５ａの後端近傍まで延びている。これにより、当接面１３５ｔにおいて荷重を受ける時、環状部材１３５の内径は柔軟に縮径するようになっており、且つ、当該荷重が解除される時、環状部材１３５の内径は弾性的に復帰するようになっている。 The annular member 135 of the present embodiment is provided with four slits 135s as notches. As shown in FIG. 4A, the four slits 135s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 135. Further, all of the four slits 135s extend from the front end to the vicinity of the rear end of the cylindrical portion 135a in the axial direction of the annular member 135. As a result, when a load is applied to the contact surface 135t, the inner diameter of the annular member 135 is flexibly reduced, and when the load is released, the inner diameter of the annular member 135 elastically returns. It is designed to do.

一方、図２に示すように、前軸１０３の開口１３１の近傍に、前端に向かって先細状の案内面として凹切頭円錐面状の案内面１０３ｔが形成されている。これにより、当接面１３５ｔは、筆記体１０６の前端側への移動に伴ってカラー部材１３３及び環状部材１３５が前端側へ移動される際（図１→図５）、案内面１０３ｔから荷重を受けるようになっている。そして、当該荷重によって、環状部材１３５は、スリット１３５ｓの存在によって縮径しながら、樹脂バネ部材１３４の圧縮変形に伴ってチップ１６１に対して当該チップ１６１の軸方向に移動するようになっている。 On the other hand, as shown in FIG. 2, a concave-headed conical guide surface 103t is formed as a tapered guide surface toward the front end in the vicinity of the opening 131 of the front shaft 103. As a result, the contact surface 135t receives a load from the guide surface 103t when the collar member 133 and the annular member 135 are moved to the front end side as the cursive 106 moves toward the front end side (FIG. 1 → 5). It is supposed to receive. Then, due to the load, the annular member 135 moves in the axial direction of the tip 161 with respect to the tip 161 as the resin spring member 134 is compressively deformed while reducing the diameter due to the presence of the slit 135s. ..

以上のような構成の多芯筆記具１０１は、以下のように作用する。 The multi-core writing tool 101 having the above configuration operates as follows.

図１及び図２に示すように全ての筆記体１０６が没入状態である場合において、一つの操作体１０７の操作部１７１が選択されて、コイルスプリング１０８の後方付勢に抗して窓孔１４１に沿って前方にスライド操作されると、当該操作体１０７に連結された筆記体１０６のチップホルダー１６３の前端部が拡径部１３３ｅを介してコイルバネ１３２に抗しつつカラー部材１３３を前端側に移動させ、当該筆記体１０６のチップ１６１が軸筒１０２の開口１３１より外部に突出される。そして、前方にスライド操作された当該操作体１０７の後側突出部１７３が軸筒１０２の内部の係止壁部１４３ａに新たに係止され、そのチップ突出状態が維持される。 When all the cursives 106 are immersed as shown in FIGS. 1 and 2, the operation unit 171 of one operation body 107 is selected, and the window hole 141 opposes the rearward bias of the coil spring 108. When the cursive is slid forward along the operating body 107, the front end portion of the tip holder 163 of the cursive body 106 connected to the operating body 107 moves the collar member 133 to the front end side while resisting the coil spring 132 via the enlarged diameter portion 133e. After moving, the tip 161 of the cursive 106 is projected to the outside from the opening 131 of the barrel 102. Then, the rear protruding portion 173 of the operating body 107 that has been slid forward is newly locked to the locking wall portion 143a inside the barrel 102, and the tip protruding state is maintained.

あるいは、他の筆記体１０６が突出状態である場合において、一つの操作体１０７の操作部１７１が選択されて、コイルスプリング１０８の後方付勢に抗して窓孔１４１に沿って前方にスライド操作されると、当該操作体１０７の前側突出部１７２が当該他の筆記体１０６の後側突出部１７３と当接状態にあるリリースバー１４３を径方向外方に押圧する。これにより、係止壁部１４３ａと当該後側突出部１７３との係止状態が解除され、当該他の筆記体１０６はコイルスプリング１０８の後方付勢により後方に移動され、すなわち、軸筒１０２内に没入される。当該他の筆記体１０６の没入と同時に、前方にスライド操作された操作体１０７に連結された筆記体１０６のチップホルダー１６３の前端部が拡径部１３３ｅを介してコイルバネ１３２に抗しつつカラー部材１３３を前端側に移動させ、当該筆記体１０６のチップ１６１が軸筒１０２の開口１３１より外部に突出される。そして、前方にスライド操作された当該操作体１０７の後側突出部１７３が軸筒１０２の内部の係止壁部１４３ａに新たに係止され、そのチップ突出状態が維持される。 Alternatively, when the other cursive 106 is in a protruding state, the operating unit 171 of one operating body 107 is selected and slides forward along the window hole 141 against the rearward bias of the coil spring 108. Then, the front protruding portion 172 of the operating body 107 presses the release bar 143 in contact with the rear protruding portion 173 of the other cursive 106 outward in the radial direction. As a result, the locked state of the locking wall portion 143a and the rear protruding portion 173 is released, and the other cursive 106 is moved rearward by the rear bias of the coil spring 108, that is, in the axle cylinder 102. Immerse yourself in. Simultaneously with the immersion of the other cursive 106, the front end of the tip holder 163 of the cursive 106 connected to the operating body 107 slid forward is a collar member while resisting the coil spring 132 via the enlarged diameter portion 133e. The 133 is moved to the front end side, and the tip 161 of the cursive 106 is projected to the outside from the opening 131 of the barrel 102. Then, the rear protruding portion 173 of the operating body 107 that has been slid forward is newly locked to the locking wall portion 143a inside the barrel 102, and the tip protruding state is maintained.

図６は、図５の多芯筆記具１０１の先端部分の拡大縦断面図であり、図７は、図６のＢ−Ｂ線断面図である。図５乃至図７に示すように、前記のいずれの場合においても、筆記体１０６の前端側への移動に伴って、環状部材１３５の当接面１３５ｔが前軸１０３の案内面１０３ｔから荷重を受ける。この時、環状部材１３５の４本のスリット１３５ｓの存在によって、環状部材１３５の内径が縮径する。この結果、図７に示すように、前軸１０３と環状部材１３５とが協働して、チップ１６１をガタつき（遊び）の無い態様で把持することができる。 FIG. 6 is an enlarged vertical sectional view of a tip portion of the multi-core writing tool 101 of FIG. 5, and FIG. 7 is a sectional view taken along line BB of FIG. As shown in FIGS. 5 to 7, in any of the above cases, as the writing body 106 moves toward the front end side, the contact surface 135t of the annular member 135 applies a load from the guide surface 103t of the front shaft 103. receive. At this time, the inner diameter of the annular member 135 is reduced due to the presence of the four slits 135s of the annular member 135. As a result, as shown in FIG. 7, the front shaft 103 and the annular member 135 cooperate with each other to grip the tip 161 in a manner without rattling (play).

更に、チップ１６１を保持するチップホルダー１６３が拡径部１３３ｅを介して係合しているカラー部材１３３と環状部材１３５の当接面１３５ｔとは、樹脂バネ部材１３４の伸縮作用によって互いに相対移動可能であるため、環状部材１３５の内径の縮径の程度等について高精度の寸法管理をしなくても、チップ１６１をガタつき（遊び）の無い態様で効果的に把持することを保証できる。 Further, the collar member 133 to which the tip holder 163 holding the tip 161 is engaged via the enlarged diameter portion 133e and the contact surface 135t of the annular member 135 can move relative to each other by the expansion and contraction action of the resin spring member 134. Therefore, it is possible to guarantee that the tip 161 can be effectively gripped in a manner without rattling (play) without having to perform highly accurate dimensional control on the degree of reduction of the inner diameter of the annular member 135.

その後、例えば他の筆記体の突出操作に伴って、それまで突出していたチップ１６１がコイルスプリング１０８の後方付勢により後方に没入されると、カラー部材１３３もコイルバネ１３２の復元力によって元の位置に復帰する。これに伴って、環状部材１３５の当接面１３５ｔが前軸１０３の案内面１０３ｔから受けていた荷重も消失し、縮径していた環状部材１３５の内径が元の状態に戻る（図７→図３）。 After that, for example, when the tip 161 that has been protruding up to that point is sunk backward by the rearward bias of the coil spring 108 due to the projecting operation of another cursive, the collar member 133 is also moved to its original position by the restoring force of the coil spring 132. Return to. Along with this, the load received by the contact surface 135t of the annular member 135 from the guide surface 103t of the front shaft 103 disappears, and the inner diameter of the reduced diameter annular member 135 returns to the original state (FIG. 7 → Figure 3).

その他、筆記体１０６を交換する際には、蓋部１０５が軸筒１０２の後端開口部を閉鎖した状態（図１参照）から、蓋部１０５のヒンジ部と反対側の操作端部を後方に押圧して係合部と被係合部との係合を解除し、蓋部１０５を後方に回動させることで、軸筒１０２の後端開口部を開口させる。これと同時に、各操作体１０７は、コイルスプリング１０８の後方付勢により、開口部１４２から後方外部へと突出される。この状態から操作体１０７を取り出すことにより、当該操作体１０７と連結状態にある筆記体１０６を軸筒１０２内から取り出すことができる。 In addition, when the cursive 106 is replaced, the lid 105 closes the rear end opening of the barrel 102 (see FIG. 1), and the operation end opposite to the hinge portion of the lid 105 is rearward. The engagement portion and the engaged portion are disengaged by pressing the lid portion 105, and the lid portion 105 is rotated rearward to open the rear end opening of the barrel 102. At the same time, each operating body 107 is projected from the opening 142 to the rear outside by the rear bias of the coil spring 108. By taking out the operating body 107 from this state, the cursive 106 connected to the operating body 107 can be taken out from the inside of the shaft cylinder 102.

その後、新たな筆記体１０６（と新たな操作体１０７）を後端開口部を通して軸筒１０２内に挿入する。そして、蓋部１０５の当接壁部に各々の操作体１０７を当接させて各々の操作体１０７を前方に押圧するように蓋部１０５を前方に回動させ、係合部と被係合部とを係合させ、蓋部１０５を閉鎖させる。これに伴って、新たな操作体１０７の鍔部１７５の前面が対応するコイルスプリング１０８の後端を押圧した状態となり、筆記体１０６（及び操作体１０７）の交換作業が終了する。 Then, a new cursive 106 (and a new operating body 107) is inserted into the barrel 102 through the rear end opening. Then, each operating body 107 is brought into contact with the contact wall portion of the lid portion 105, and the lid portion 105 is rotated forward so as to press each operating body 107 forward, and is engaged with the engaging portion. Engage with the portion and close the lid portion 105. Along with this, the front surface of the flange portion 175 of the new operating body 107 presses the rear end of the corresponding coil spring 108, and the replacement work of the cursive body 106 (and the operating body 107) is completed.

以上の通り、本実施形態の多芯筆記具１０１によれば、筆記体１０６（チップホルダー１６３を含む）の前端側への移動に伴ってカラー部材１３３（拡径部１３３ｅを含む）及び樹脂バネ部材１３４を介して環状部材１３５が前端側へ移動し、環状部材１３５の当接面１３５ｔが前軸１０３の案内面１０３ｔから荷重を受けることによって、環状部材１３５のスリット１３５ｓの存在によって環状部材１３５の内径が縮径する。これにより、前軸１０３と環状部材１３５とが協働してチップ１６１の先端部をガタつき（遊び）の無い態様で把持することができる。更に、チップホルダー１６３が当接するカラー部材１３３と環状部材１３５とが樹脂バネ部材１３４を介して接続されていることにより、環状部材１３５の内径の縮径の程度等について高精度の寸法管理をしなくても、チップ１６１をガタつき（遊び）の無い態様で効果的に把持することを保証できる。 As described above, according to the multi-core writing instrument 101 of the present embodiment, the color member 133 (including the enlarged diameter portion 133e) and the resin spring member as the cursive 106 (including the chip holder 163) moves toward the front end side. The annular member 135 moves to the front end side via the 134, and the contact surface 135t of the annular member 135 receives a load from the guide surface 103t of the front shaft 103, so that the presence of the slit 135s of the annular member 135 causes the annular member 135. The inner diameter is reduced. As a result, the front shaft 103 and the annular member 135 can cooperate to grip the tip portion of the tip 161 in a manner without rattling (play). Further, since the collar member 133 to which the tip holder 163 comes into contact and the annular member 135 are connected via the resin spring member 134, the degree of reduction of the inner diameter of the annular member 135 can be controlled with high accuracy. Even without it, it can be guaranteed that the tip 161 is effectively gripped in a manner without rattling (play).

また、本実施形態の多芯筆記具１０１によれば、切欠きとしての４本のスリット１３５ｓが環状部材１３５の周方向に等間隔に配置されており、各スリット１３５ｓが環状部材１３５の軸方向に延びているため、環状部材１３５の内径が周方向にバランス良く縮径することができる。 Further, according to the multi-core writing tool 101 of the present embodiment, four slits 135s as notches are arranged at equal intervals in the circumferential direction of the annular member 135, and each slit 135s is arranged in the axial direction of the annular member 135. Since it is extended, the inner diameter of the annular member 135 can be reduced in a well-balanced manner in the circumferential direction.

また、当接面１３５ｔと案内面１０３ｔとが、互いに対応する切頭円錐面状と凹切頭円錐面状であることにより、環状部材１３５の当接面１３５ｔは周方向にバランスよく荷重を受けることができ、結果的に環状部材１３５が周方向にバランス良く縮径することができる。このように、当接面１３５ｔと案内面１０３ｔとは、互いに前端に向かって先細状であることが好ましい。先細状の当接面１３５ｔは、円柱状の環状部材１３５の前端外周にＲを設けることでも、形成され得る。また、先細状の当接面１３５ｔは、軸線周りに回転対称な凸曲面を有していて、先細状の案内面１０３ｔは、軸線周りに回転対称であって前記凸曲面の曲率よりも緩やかな曲率の凹曲面または凹切頭円錐面であってもよい。 Further, since the contact surface 135t and the guide surface 103t have a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the contact surface 135t of the annular member 135 receives a load in a well-balanced manner in the circumferential direction. As a result, the annular member 135 can be reduced in diameter in the circumferential direction in a well-balanced manner. As described above, it is preferable that the contact surface 135t and the guide surface 103t are tapered toward the front end of each other. The tapered contact surface 135t can also be formed by providing R on the outer periphery of the front end of the columnar annular member 135. Further, the tapered contact surface 135t has a convex curved surface that is rotationally symmetric around the axis, and the tapered guide surface 103t is rotationally symmetric around the axis and is gentler than the curvature of the convex curved surface. It may be a concave curved surface or a concave conical surface with a curvature.

なお、本実施形態の多芯筆記具１０１では、環状部材１３５がチップ１６１の領域で軸方向に移動可能であって、環状部材１３５が縮径する時にはチップ１６１の領域を把持するようになっているが、本発明はこれに限定されない。例えば、環状部材１３５がチップ１６１を保持する別部材（例えばチップホルダー）の領域で軸方向に移動可能であって、環状部材１３５が縮径する時に当該別部材の領域を把持するようになっていてもよい。 In the multi-core writing tool 101 of the present embodiment, the annular member 135 is movable in the axial direction in the region of the tip 161 and grips the region of the tip 161 when the annular member 135 is reduced in diameter. However, the present invention is not limited to this. For example, the annular member 135 is movable in the axial direction in the region of another member (for example, the chip holder) that holds the tip 161 and grips the region of the separate member when the annular member 135 is reduced in diameter. You may.

また、スリット１３５ｓの数、サイズ、形状等を適宜に変更することによって、環状部材１３５の弾性（縮径のしやすさ）の程度を調整することができる。また、環状部材１３５の材料及び／または肉厚を変更することによっても、環状部材１３５の弾性（縮径のしやすさ）の程度を調整することができる。 Further, by appropriately changing the number, size, shape, etc. of the slits 135s, the degree of elasticity (easiness of diameter reduction) of the annular member 135 can be adjusted. Further, the degree of elasticity (easiness of diameter reduction) of the annular member 135 can be adjusted by changing the material and / or the wall thickness of the annular member 135.

また、スリット１３４ｓの数、サイズ、形状等を適宜に変更することによって、樹脂バネ部材１３４の弾性（伸縮のしやすさ）の程度を調整することができる。スリット１３４ｓは、軸方向に垂直な方向に延びる態様が好適であるが、軸方向に対して斜めに（例えば螺旋状に）延びる態様であってもよい。 Further, by appropriately changing the number, size, shape, etc. of the slits 134s, the degree of elasticity (easiness of expansion and contraction) of the resin spring member 134 can be adjusted. The slit 134s preferably extends in a direction perpendicular to the axial direction, but may extend obliquely (for example, spirally) with respect to the axial direction.

また、樹脂バネ部材１３４の肉厚を変更することによっても、樹脂バネ部材１３４の弾性（伸縮のしやすさ）の程度を調整することができる。更に、樹脂バネ部材１３４は、環状部材１３５（当接面１３５ｔ及び円筒部１３５ａ）とは別体の樹脂バネ部材として構成されて、円筒部１３５ａに接合されてもよい。この場合、樹脂バネ部材の材料を調整することによっても、当該樹脂バネ部材の弾性（縮径のしやすさ）の程度を調整することができる。 Further, by changing the wall thickness of the resin spring member 134, the degree of elasticity (easiness of expansion and contraction) of the resin spring member 134 can be adjusted. Further, the resin spring member 134 may be configured as a resin spring member separate from the annular member 135 (contact surface 135t and cylindrical portion 135a) and may be joined to the cylindrical portion 135a. In this case, the degree of elasticity (easiness of diameter reduction) of the resin spring member can also be adjusted by adjusting the material of the resin spring member.

更に、樹脂バネ部材１３４（あるいは別体の樹脂バネ部材）としては、スリット１３４ｓを有する形態に限定されず、軸方向に伸縮する蛇腹構造を有する形態が採用されてもよい。 Further, the resin spring member 134 (or a separate resin spring member) is not limited to the form having the slits 134s, and a form having a bellows structure that expands and contracts in the axial direction may be adopted.

なお、異なるレフィル径（チップ１６１及び／またはチップホルダー１６３の径）を有する複数種類の交換用レフィルを混在させて利用することも可能である。 It is also possible to mix and use a plurality of types of replacement refills having different refill diameters (diameters of the chip 161 and / or the chip holder 163).

更には、筆記体に代えて、チップ１６１として摩擦部材を保持するレフィルを用いることも可能である。摩擦部材とは、消しゴムや、熱変色性筆記具用の摩擦熱発生用ラバー（消去用ラバー）である。この場合、筆跡消去時に摩擦部材がガタつく事を防止することができ、より安定した筆跡消去感が得られる。 Further, instead of the cursive, it is possible to use a refill that holds the friction member as the tip 161. The friction member is an eraser or a rubber for generating frictional heat (rubber for erasing) for a heat-discoloring writing tool. In this case, it is possible to prevent the friction member from rattling during handwriting erasing, and a more stable handwriting erasing feeling can be obtained.

また、本実施形態では、弾性部材１３５と樹脂バネ部材１３４とカラー部材１３３とが互いに固定されており、また、カラー部材１３３と前軸１０３とがコイルバネ１３２を介して互いに固定されている。すなわち、筆記体１０６の方に弾性部材１３５を設けておく必要がないため、従来のチップホルダーを有する既存の交換用レフィルを利用することができる。 Further, in the present embodiment, the elastic member 135, the resin spring member 134, and the collar member 133 are fixed to each other, and the collar member 133 and the front shaft 103 are fixed to each other via the coil spring 132. That is, since it is not necessary to provide the elastic member 135 on the cursive 106, an existing replacement refill having a conventional tip holder can be used.

従って、本実施形態の発明は、既存の交換用レフィルを利用することが可能な、多芯筆記具用の軸筒として把握することが可能である。この場合、本実施形態は、前端にチップ１６１が固定された複数のチップホルダー１６３を軸方向に移動可能に収容可能であって、前端に開口１３１を有し、前記複数のチップホルダー１６３のうちの１つのチップホルダー１６３の移動に伴って当該１つのチップホルダー１６３に固定されたチップ１６１を前記開口１３１から出没させることが可能な多芯筆記具用の軸筒１０２として説明可能である。 Therefore, the invention of the present embodiment can be grasped as a shaft cylinder for a multi-core writing tool that can utilize an existing replacement refill. In this case, in the present embodiment, a plurality of chip holders 163 having chips 161 fixed to the front end can be accommodated so as to be movable in the axial direction, and the opening 131 is provided at the front end, and among the plurality of chip holders 163. It can be described as a shaft cylinder 102 for a multi-core writing tool capable of causing the tip 161 fixed to the one tip holder 163 to appear and disappear from the opening 131 as the one tip holder 163 moves.

当該軸筒１０２は、１つのチップホルダー１６３の前端側への移動に伴って当該１つのチップホルダー１６３に固定されたチップ１６１の外周に遊嵌可能であって当該遊嵌時において当該チップ１６１に対して当該チップ１６１の軸方向に移動可能な環状部材１３５と、環状部材１３５に樹脂バネ部材１３４を介して接続され前記１つのチップホルダー１６３の前端側への移動に伴って当該１つのチップホルダー１６３に当接可能なカラー部材１３３と、カラー部材１３３を前軸１０３の内面に支持するコイルバネ１３２と、を備えている。そして、環状部材１３５の外周の少なくとも一部には、前端に向かって先細状の当接面１３５ｔが形成されており、環状部材１３５の一部には、切欠きとしてのスリット１３５ｓが形成されており、当接面１３５ｔにおいて荷重を受ける時に当該環状部材１３５の内径が縮径するようになっている。一方、前軸１０３の内面の一部には、前端に向かって先細状の案内面１０３ｔが形成されており、前記当接面１３５ｔは、チップホルダー１６３の前端側への移動に伴って環状カラー１３３及び弾性部材１３４を介して環状部材１３５が前端側へ移動する際、前記案内面１０３ｔから前記荷重を受けるようになっている。 The barrel 102 can be loosely fitted to the outer periphery of the tip 161 fixed to the one tip holder 163 as the one tip holder 163 moves toward the front end side, and is fitted to the tip 161 at the time of the loose fitting. On the other hand, the annular member 135 that can move in the axial direction of the chip 161 and the one chip holder that is connected to the annular member 135 via the resin spring member 134 and moves toward the front end side of the one chip holder 163. It includes a collar member 133 that can come into contact with the collar member 133, and a coil spring 132 that supports the collar member 133 on the inner surface of the front shaft 103. Then, at least a part of the outer circumference of the annular member 135 is formed with a tapered contact surface 135t toward the front end, and a slit 135s as a notch is formed in a part of the annular member 135. The inner diameter of the annular member 135 is reduced when a load is applied to the contact surface 135t. On the other hand, a guide surface 103t tapered toward the front end is formed on a part of the inner surface of the front shaft 103, and the contact surface 135t has an annular collar as the tip holder 163 moves toward the front end side. When the annular member 135 moves to the front end side via the 133 and the elastic member 134, the load is received from the guide surface 103t.

このような軸筒１０２によれば、筆記体１０６（チップホルダー１６３を含む）の前端側への移動に伴ってカラー部材１３３（拡径部１３３ｅを含む）及び樹脂バネ部材１３４を介して環状部材１３５が前端側へ移動し、環状部材１３５の当接面１３５ｔが前軸１０３の案内面１０３ｔから荷重を受けることによって、環状部材１３５のスリット１３５ｓの存在によって環状部材１３５の内径が縮径する。これにより、前軸１０３と環状部材１３５とが協働してチップ１６１の先端部をガタつき（遊び）の無い態様で把持することができる。更に、チップホルダー１６３が当接するカラー部材１３３と環状部材１３５とが樹脂バネ部材１３４を介して接続されていることにより、環状部材１３５の内径の縮径の程度等について高精度の寸法管理をしなくても、チップ１６１をガタつき（遊び）の無い態様で効果的に把持することを保証できる。 According to such a shaft cylinder 102, the annular member via the collar member 133 (including the enlarged diameter portion 133e) and the resin spring member 134 as the cursive 106 (including the tip holder 163) moves toward the front end side. As the 135 moves to the front end side and the contact surface 135t of the annular member 135 receives a load from the guide surface 103t of the front shaft 103, the inner diameter of the annular member 135 is reduced due to the presence of the slit 135s of the annular member 135. As a result, the front shaft 103 and the annular member 135 can cooperate to grip the tip portion of the tip 161 in a manner without rattling (play). Further, since the collar member 133 to which the tip holder 163 comes into contact and the annular member 135 are connected via the resin spring member 134, the degree of reduction of the inner diameter of the annular member 135 can be controlled with high accuracy. Even without it, it can be guaranteed that the tip 161 is effectively gripped in a manner without rattling (play).

なお、以上の説明においては、チップホルダー１６３を前端側へ移動させる機構として、操作体１０７の操作部１７１をスライド操作させる態様が採用されているが、これに代えて、いわゆる回転繰り出し機構が採用されてもよい。 In the above description, as a mechanism for moving the tip holder 163 to the front end side, a mode in which the operation unit 171 of the operating body 107 is slid is adopted, but instead of this, a so-called rotary feeding mechanism is adopted. May be done.

１０１多芯筆記具
１０２軸筒
１０３前軸
１０３ｔ案内面
１３１開口
１３２コイルバネ（第２弾性部材の一例）
１３３カラー部材（環状カラーの一例）
１３３ａ本体部
１３３ｔ先細部
１３３ｂ後端カラー部
１３３ｅ拡径部
１３３ｆバネ固定補助部
１３４樹脂バネ部材（弾性部材の一例）
１３４ｓスリット
１３４ｂリブ
１３５環状部材
１３５ｓスリット
１３５ｔ当接面
１３５ａ円筒部
１０４後軸
１４１窓孔
１４３リリースバー
１４３ａ係止壁部
１４４クリップ
１０５蓋部
１０６筆記体（ボールペン）
１６１チップ
１６３チップホルダー（インキ収容筒体）
１０７操作体
１７１操作部
１７２前側突出部
１７３後側突出部
１７４嵌入部
１７５鍔部
１０８コイルスプリング
１０９スプリング支持体

101 Multi-core writing tool 102 Shaft cylinder 103 Front shaft 103t Guide surface 131 Opening 132 Coil spring (example of second elastic member)
133 color member (an example of annular color)
133a Main body 133t Tip detail 133b Rear end collar 133e Diameter expansion 133f Spring fixing auxiliary 134 Resin spring member (an example of elastic member)
134s Slit 134b Rib 135 Annular member 135s Slit 135t Contact surface 135a Cylindrical part 104 Rear shaft 141 Window hole 143 Release bar 143a Locking wall part 144 Clip 105 Lid part 106 Cursive (ballpoint pen)
161 Chip 163 Chip holder (ink storage cylinder)
107 Operation body 171 Operation part 172 Front side protrusion 173 Rear side protrusion 174 Fitting part 175 Flange part 108 Coil spring 109 Spring support

Claims

A barrel with an opening at the front end and
A plurality of chip holders housed inside the barrel and movable in the axial direction of the barrel,
A tip that is fixed to the front end of each tip holder and can appear and disappear from the opening of the barrel as the tip holder moves.
As one of the plurality of chip holders moves toward the front end side, the chip holder can be loosely fitted to the outer periphery of the one chip holder or a chip fixed to the one chip holder. An annular member that can sometimes move in the axial direction of the chip holder or the chip with respect to the chip holder or the chip.
An annular collar that is connected to the annular member via an elastic member and can come into contact with the one chip holder as it moves toward the front end side of the one chip holder.
A second elastic member that supports the annular collar on the inner surface of the barrel,
With
On at least a part of the outer circumference of the annular member, when the annular member moves to the front end side via the annular collar and the elastic member with the movement of the one tip holder toward the front end side, the shaft cylinder A contact surface is formed that abuts a part of the inner surface of the
A notch is formed in a part of the annular member so that the inner diameter of the annular member is reduced when a load is applied to the contact surface.
A guide surface is formed on a part of the inner surface of the barrel so that the contact surface comes into contact with the tip holder as it moves toward the front end side.
The contact surface receives the load from the guide surface when the annular member moves toward the front end side via the annular collar and the elastic member as the one tip holder moves toward the front end side. A multi-core writing tool characterized by being.

A plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member.
The multi-core writing tool according to claim 1, wherein each of the plurality of notches is a slit extending in the axial direction of the annular member.

The contact surface is tapered toward the front end and
The haunting type writing tool according to claim 1 or 2, wherein the guide surface is also tapered toward the front end.

The multi-core writing tool according to claim 3, wherein the contact surface has a truncated conical surface.

The multi-core writing tool according to any one of claims 1 to 4, wherein the elastic member is a tubular resin spring member having a large number of slits extending in a direction perpendicular to the axial direction.

The multi-core writing tool according to claim 5, wherein the annular member and the annular collar are integrally molded with the resin spring member.

A plurality of chip holders having chips fixed to the front end can be accommodated so as to be movable in the axial direction, and the chip holder has an opening at the front end. A shaft tube for a multi-core writing tool that allows chips fixed to one chip holder to appear and disappear from the opening.
As the one chip holder moves toward the front end side, it can be loosely fitted to the outer circumference of the one chip holder or the chip fixed to the one chip holder, and at the time of the loose fitting, the one chip holder can be loosely fitted. Or, with respect to the chip, the one chip holder or an annular member that can move in the axial direction of the chip.
An annular collar that is connected to the annular member via an elastic member and can come into contact with the one chip holder as it moves toward the front end side of the one chip holder.
A second elastic member that supports the annular collar on the inner surface of the barrel,
With
On at least a part of the outer circumference of the annular member, when the annular member moves to the front end side via the annular collar and the elastic member with the movement of the one tip holder toward the front end side, the shaft cylinder A contact surface is formed that abuts a part of the inner surface of the
A notch is formed in a part of the annular member so that the inner diameter of the annular member is reduced when a load is applied to the contact surface.
A guide surface is formed on a part of the inner surface of the barrel so that the contact surface comes into contact with the tip holder as it moves toward the front end side.
The contact surface receives the load from the guide surface when the annular member moves toward the front end side via the annular collar and the elastic member as the one tip holder moves toward the front end side. A shaft tube for multi-core writing tools, which is characterized by being.

A plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member.
The shaft tube for a multi-core writing tool according to claim 7, wherein each of the plurality of notches is a slit extending in the axial direction of the annular member.

The contact surface is tapered toward the front end and
The shaft tube for a multi-core writing tool according to claim 7 or 8, wherein the guide surface is also tapered toward the front end.

The shaft cylinder for a multi-core writing tool according to claim 9, wherein the contact surface has a conical surface with a facet.

The shaft cylinder for a multi-core writing tool according to any one of claims 7 to 9, wherein the elastic member is a tubular resin spring member having a large number of slits extending in a direction perpendicular to the axial direction. ..

The shaft cylinder for a multi-core writing tool according to claim 11, wherein the annular member and the annular collar are integrally molded with the resin spring member.