JP2023035916A - Retractable writing instrument - Google Patents

Retractable writing instrument Download PDF

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JP2023035916A
JP2023035916A JP2022131432A JP2022131432A JP2023035916A JP 2023035916 A JP2023035916 A JP 2023035916A JP 2022131432 A JP2022131432 A JP 2022131432A JP 2022131432 A JP2022131432 A JP 2022131432A JP 2023035916 A JP2023035916 A JP 2023035916A
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barrel
writing instrument
rear end
window hole
end opening
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真史 渡邊
Masashi Watanabe
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Pentel Co Ltd
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Pentel Co Ltd
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Abstract

To provide a retractable writing instrument in which a breech plug can be stably attached to the rear end opening of a barrel in order to solve the problem that in the retractable writing instrument disclosed in JP 2019-116038A, the edge forming the window hole may open in the circumferential direction due to molding, and thus the positional relation between the locking portion and the locked portion is deviated, and the mounting operation of the breech plug becomes unstable.SOLUTION: There is provided a retractable writing instrument in which a clamping protrusion consisting of at least two projections is provided in an insertion portion in front of a breech plug, and a notch portion formed by connecting an edge forming a rear end opening of a barrel and an edge forming a window hole is provided. An inner wall surface of the barrel is provided with a clamped protrusion that is circumferentially clamped by the clamping protrusion, straddling the edge forming the window hole connected to the notch portion in the circumferential direction.SELECTED DRAWING: Figure 1

Description

本発明は、軸筒内部に、前端に筆記部を有する筆記具本体が前後動可能に配置され、筆記部の、軸筒前端開口部からの突出及び没入を可能とした、所謂出没式筆記具に関するものであって、軸筒の後端開口部に尾栓を取り付ける構造の出没式筆記具に関するものである。以降、筆記部が突出する方向を前方、筆記部が没入する方向を後方とする。また、筆記部が軸筒前端開口部から突出して筆記可能になった状態を突出状態、筆記部が軸筒内部に没入した状態を没入状態とする。 The present invention relates to a so-called retractable writing instrument in which a writing instrument body having a writing part at the front end is arranged in a barrel so that it can move back and forth, and the writing part can be projected and retracted from the front end opening of the barrel. The present invention relates to a retractable writing instrument having a structure in which a tail plug is attached to a rear end opening of a barrel. Hereinafter, the direction in which the writing unit protrudes is defined as the front, and the direction in which the writing unit is retracted is defined as the rear. A state in which the writing section protrudes from the front end opening of the barrel so that writing is possible is defined as a projected state, and a state in which the writing section is retracted into the barrel is defined as a recessed state.

従来から、軸筒内部に筆記芯などの部材を配置できるよう、軸筒の後端に開口部が設けられた出没式筆記具が知られている。当該開口部は、出没式筆記具の輸送や使用の際に、内部に配置した部材が脱落したり外観を損ねたりしないよう、尾栓を取り付けて閉塞する構造が一般的である。 2. Description of the Related Art Conventionally, retractable writing instruments are known in which an opening is provided at the rear end of a barrel so that a member such as a writing lead can be arranged inside the barrel. The opening generally has a structure in which a tail plug is attached to the opening so that the members placed inside do not drop off or damage the appearance when the retractable writing instrument is transported or used.

例えば特許文献1(特開2019-116038号公報)には、軸筒後端開口部には、径方向外側に突出した係止部が、尾栓には、径方向内側に突出した被係止部が設けられ、尾栓の取り付けに際して、係止部が被係止部を乗り越えることで、尾栓が軸筒後端開口部に取り付けられる出没式筆記具が開示されている。 For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2019-116038), a locking portion protruding radially outward is provided at the rear end opening of the barrel, and a locked portion protruding radially inward is provided at the tail plug. A retractable writing instrument is disclosed in which a tail plug is attached to a rear end opening of a barrel barrel by providing a portion, and when the tail plug is attached, the locking portion climbs over the locked portion.

特開2019-116038号公報JP 2019-116038 A

特許文献1に開示されている出没式筆記具は、軸筒後端開口部を形成する縁部から軸筒側壁にかけて、軸筒前後方向前方に延びる窓穴が形成されている。当該窓孔を形成する縁部は、成形後の収縮等によって周方向に開いてしまうことがある。よって、係止部と被係止部との位置関係がずれてしまい、尾栓の取り付け作業が不安定になるという問題があった。 The retractable writing instrument disclosed in Patent Document 1 has a window hole extending forward in the longitudinal direction of the barrel from the edge forming the rear end opening of the barrel to the side wall of the barrel. The edge forming the window hole may open in the circumferential direction due to shrinkage or the like after molding. Therefore, there is a problem that the positional relationship between the locking portion and the locked portion is deviated, and the mounting operation of the breech plug becomes unstable.

本発明は、尾栓を軸筒後端開口部に安定して取り付けることができる筆記具を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument in which a tail plug can be stably attached to the rear end opening of a barrel.

本発明は、軸筒内部に、前端に筆記部が設けられた筆記具本体が前後動可能に配置され、筆記具本体後端には作動子が配置され、軸筒側壁には軸筒内部と軸筒外部とを貫通し、前後方向に延びる窓孔が設けられ、作動子の一部が窓孔を介して軸筒外部に露出し、当該一部を前後動させることで筆記部を軸筒前端開口部から出没させることができる出没式筆記具であって、軸筒後端開口部に尾栓が取り付けられ、尾栓前方には軸筒後端開口部に挿入される挿入部が設けられ、挿入部には少なくとも2本の突起からなる挟持突起が設けられ、軸筒後端開口部を形成する縁部と、窓孔を形成する縁部と、が連接して形成する切り欠き部が設けられ、軸筒内壁面に、切り欠き部と連接した窓孔を形成する縁部を周方向に跨いで挟持突起により周方向に挟持される被挟持突起が設けられた、出没式筆記具を第1の要旨とする。また、前記挟持突起の前端が、前記挿入部の前端である出没式筆記具を第2の要旨とする。 In the present invention, a writing instrument body having a writing part at the front end thereof is arranged in a barrel so as to be movable back and forth, an actuator is arranged at the rear end of the writing instrument body, and the inside of the barrel and the barrel are arranged on the side wall of the barrel. A window hole extending in the front-rear direction is provided through the outside, and a part of the actuator is exposed to the outside of the shaft cylinder through the window hole. A retractable writing instrument that can be retracted from a part, wherein a tail plug is attached to the rear end opening of the barrel, and an insertion part is provided in front of the tail plug to be inserted into the rear end opening of the barrel. is provided with a clamping protrusion consisting of at least two protrusions, and a notch formed by connecting the edge forming the rear end opening of the barrel and the edge forming the window hole is provided, A first gist of a retractable writing instrument in which a clipped projection that is circumferentially clamped by a clamping projection is provided on an inner wall surface of a barrel, straddling an edge forming a window hole connected to a notch in the circumferential direction. and A second aspect of the present invention is a retractable writing instrument in which the front end of the holding projection is the front end of the insertion portion.

本発明の筆記具は、挟持突起が、切り欠き部と連接した窓孔を形成する縁部を周方向に跨いで設けられた被挟持突起を周方向に挟持できるため、当該窓孔を形成する縁部が周方向に開くのを防ぐことができ、尾栓を軸筒後端開口部に安定して取り付けることができるものである。また第2の要旨にあっては、取り付け作業の際に、尾栓のうち挟持突起が、軸筒に最も先に接触させることができ、取り付け作業を開始するのとほぼ同時に切り欠き部と連接した窓孔を形成する縁部が周方向に開くのを防ぐことができ、尾栓を軸筒後端開口部に安定して取り付けることができるものである。 In the writing instrument of the present invention, since the clamping protrusion can circumferentially clamp the clamped protrusion provided across the edge forming the window hole connected to the notch in the circumferential direction, the edge forming the window hole can be clamped. It is possible to prevent the portion from opening in the circumferential direction, and the tail plug can be stably attached to the rear end opening of the barrel. In the second aspect, during the installation work, the clamping projection of the breech plug can be brought into contact with the barrel first, and is connected to the notch substantially at the same time as the installation work is started. It is possible to prevent the edge forming the window hole from opening in the circumferential direction, and the tail plug can be stably attached to the rear end opening of the barrel.

ボールペン1の外観図External view of ballpoint pen 1 図1のA‐A’線断面矢視図A-A' line cross-sectional view in FIG. 筆記具本体3の外観図External view of the writing instrument main body 3 (a)後軸2bの外観図、(b)図4(a)のB‐B’線断面矢視図(a) External view of rear axle 2b, (b) Cross-sectional view taken along line B-B' in Fig. 4(a) 後軸2bの外観斜視図External perspective view of rear axle 2b 尾栓7の外観斜視図Appearance perspective view of the tail plug 7 尾栓7を後端開口部2bbに取り付けた状態の断面図Sectional view of the state where the tail plug 7 is attached to the rear end opening 2bb 緩衝材4の外観斜視図Appearance perspective view of cushioning material 4 区画部材5の外観斜視図Appearance perspective view of partition member 5 区画部材5の縦断面図Longitudinal cross-sectional view of partition member 5 後軸2b縦断面の前方拡大図Front enlarged view of longitudinal section of rear axle 2b 図11のC部分拡大図Enlarged view of part C in FIG.

本発明は、ボールペン、シャープペンシル、筆ペン、フェルトペン、マーキングペンなどの筆記具であって、ボールペンチップなどの筆記部を軸筒前端開口部から出没可能な出没式筆記具として実施することができる。以降、図面を参照しつつ本発明の実施形態を説明する。 The present invention is a writing instrument such as a ballpoint pen, a mechanical pencil, a calligraphy pen, a felt pen, a marking pen, etc., and can be implemented as a retractable writing instrument in which a writing part such as a ballpoint pen tip can be retracted from the front end opening of the barrel. Hereinafter, embodiments 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係る出没式筆記具であるボールペン1の外観図、図2は図1のA‐A’線断面矢視図である。ボールペン1は、中空筒状の軸筒2内部に、3本の筆記具本体3、緩衝部材4、区画部材5、弾発部材としてのコイルスプリング6が配置されている。 FIG. 1 is an external view of a ball-point pen 1, which is a retractable writing instrument according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A' of FIG. The ball-point pen 1 includes three writing instrument bodies 3, a cushioning member 4, a partitioning member 5, and a coil spring 6 as an elastic member arranged inside a hollow cylindrical barrel 2. As shown in FIG.

図3は、筆記具本体3の外観図である。ボールペン1は、軸筒2内部に筆記具本体3が3本配置された、多芯の出没式筆記具である。筆記具本体3は、前端に筆記部としてのボールペンチップ3aaが配置されたボールペンリフィル3aの後端に、作動子3ba又はクリップ用作動子3bbが配置され構成されている。3本の筆記具本体3のうち、2本はボールペンリフィル3aに作動子3baが(図3(a))、残り1本はボールペンリフィル3aにクリップ用作動子3bbが配置されている(図3(b))。クリップ用作動子3bbにはクリップ3bcが取り付けられる。 FIG. 3 is an external view of the writing instrument main body 3. As shown in FIG. A ball-point pen 1 is a multi-core retractable writing instrument in which three writing instrument bodies 3 are arranged inside a barrel 2 . The writing instrument main body 3 is constructed by arranging an actuator 3ba or a clip actuator 3bb at the rear end of a ball-point pen refill 3a having a ball-point pen tip 3aa as a writing part at the front end. Of the three writing instrument bodies 3, two have a ball-point pen refill 3a with an actuator 3ba (Fig. 3(a)), and the remaining one has a ball-point pen refill 3a with a clip actuator 3bb (Fig. 3 (a)). b)). A clip 3bc is attached to the clip actuator 3bb.

軸筒2は、前軸2aと後軸2bとにより構成されている。前軸2aの後方が後軸2bの前端開口端部から挿入される。前軸2aの後方外壁面と後軸2bの前方内壁面には、それぞれ螺子部が設けられており、前軸2aと後軸2bとが螺子螺合により結合可能となっている。当該螺子螺合を解除することで、筆記具本体3を簡単に配置、交換することができる。 The barrel 2 is composed of a front shaft 2a and a rear shaft 2b. The rear portion of the front shaft 2a is inserted through the front open end of the rear shaft 2b. Threaded portions are provided on the rear outer wall surface of the front shaft 2a and the front inner wall surface of the rear shaft 2b, respectively, so that the front shaft 2a and the rear shaft 2b can be coupled by screwing. By releasing the screw engagement, the writing instrument main body 3 can be easily arranged and replaced.

前軸2aは所謂2色成型品であり、前軸2aの径方向内側に位置する1次側がポリプロピレン樹脂、前軸2aの径方向外側に位置する2次側が熱可塑性エラストマーからなる部材である。前軸2aの外壁面には梨地加工が施されており、使用者が手で把持しやすくなるグリップとして機能する。 The front shaft 2a is a so-called two-color molded product, and the primary side located radially inside the front shaft 2a is made of polypropylene resin, and the secondary side located radially outside of the front shaft 2a is made of thermoplastic elastomer. The outer wall surface of the front shaft 2a is satin-finished and functions as a grip that can be easily gripped by the user's hand.

前軸2aは、本実施形態のように2色成型品以外にも、公知の方法で所望の形状を構成することができる。グリップを別部材とし、前軸2aの外壁面に被覆する構成とすることもできる。 The front shaft 2a can be configured in a desired shape by a known method other than the two-color molded product as in this embodiment. It is also possible to configure the grip as a separate member so as to cover the outer wall surface of the front shaft 2a.

前軸2aの材質としては他に、成形性や耐久性などを考慮して、ポリカーボネート樹脂、アクリル樹脂、ポリエチレン樹脂、ポリアミド樹脂、ポリブチレンテレフタレート樹脂、ポリブチレンナフタレート樹脂、ポリエチレンナフタレート樹脂、塩化ビニル樹脂、エチレンビニルアルコール共重合体、ポリアクリロニトリル樹脂、フッ素樹脂、ポリアセタール樹脂、ポリエチレンテレフタレート樹脂、ポリスチレン樹脂、ABS樹脂、シリコーン樹脂、エラストマー、又は、これらの樹脂を含む複合材などを適宜選択することができる。また、成形方法も本実施形態のような2色成形に限られず、公知の様々な方法を適宜選択することができる。 Other materials for the front shaft 2a include polycarbonate resin, acrylic resin, polyethylene resin, polyamide resin, polybutylene terephthalate resin, polybutylene naphthalate resin, polyethylene naphthalate resin, and chloride resin, in consideration of moldability and durability. Vinyl resin, ethylene vinyl alcohol copolymer, polyacrylonitrile resin, fluororesin, polyacetal resin, polyethylene terephthalate resin, polystyrene resin, ABS resin, silicone resin, elastomer, composite material containing these resins, etc. can be done. Further, the molding method is not limited to two-color molding as in this embodiment, and various known methods can be appropriately selected.

図4(a)は後軸2bの外観図、図4(b)は図4(a)のB‐B’線断面矢視図、図5は後軸2bの外観斜視図である。後軸2bの後方側壁には、前後方向に延び、後軸2bの内部と外部とに貫通した窓孔2baが設けられている。窓孔2baは、筆記具本体3と同じ数設けられ、本実施形態においては3箇所に設けられている。窓孔2baを介して、作動子3ba及びクリップ用作動子3bbの一部が、軸筒2の外部に露出している。軸筒2の外部に露出したクリップ用作動子3bbの当該一部に、クリップ3bcを取り付けることができる。軸筒2の外部に露出した作動子3baの当該一部及びクリップ3bcを、窓穴2baに沿って後方から前方へ操作すると、連動して筆記具本体3が軸筒2内部を前進する。 4(a) is an external view of the rear barrel 2b, FIG. 4(b) is a sectional view taken along the line B-B' of FIG. 4(a), and FIG. 5 is an external perspective view of the rear barrel 2b. A rear side wall of the rear axle 2b is provided with a window hole 2ba extending in the front-rear direction and passing through the inside and outside of the rear axle 2b. The window holes 2ba are provided in the same number as the writing instrument main body 3, and are provided at three locations in the present embodiment. A part of the operating element 3ba and the clip operating element 3bb are exposed to the outside of the shaft tube 2 through the window hole 2ba. A clip 3bc can be attached to the part of the clip actuator 3bb exposed to the outside of the shaft tube 2 . When the part of the actuator 3ba exposed outside the barrel 2 and the clip 3bc are operated from the rear to the front along the window hole 2ba, the writing instrument main body 3 moves forward inside the barrel 2 in conjunction.

筆記具本体3は、コイルスプリング6により後方に付勢されている。コイルスプリング6の前端は、軸筒2内部で前後動不可能に配置された区画部材5の後端面と当接している。コイルスプリング6の後端は、作動子3ba及びクリップ用作動子3bbの前方に設けられて段部と当接している。コイルスプリング6は自然状態から縮んだ状態で区画部材5と、作動子3ba及びクリップ用作動子3bbとにより挟持され、筆記具本体3を常時後方に付勢している。 The writing instrument main body 3 is urged rearward by a coil spring 6 . The front end of the coil spring 6 is in contact with the rear end surface of the partition member 5 arranged so as not to move back and forth inside the barrel 2 . The rear end of the coil spring 6 is provided in front of the operating element 3ba and the clip operating element 3bb and is in contact with the stepped portion. The coil spring 6 is sandwiched between the partition member 5, the operating element 3ba, and the clip operating element 3bb in a contracted state from the natural state, and constantly biases the writing instrument main body 3 rearward.

作動子3ba(又はクリップ3bc)を操作して、筆記具本体3を前進させると、作動子3ba(又はクリップ用作動子3bb)の肩部3baa(又は肩部3bba)が、後軸2b内部に設けられた、前後方向に延びる被挟持突起2bdの前端部に係止し、ボールペンチップ3aaが前軸2aの前端開口部からの突出状態となる。肩部3baa及び肩部3bbaは、円筒状の後軸2b内において弦方向に突出しており、1つの筆記具本体3に対して周方向に隣り合う被挟持突起2bdの前端部に係止することとなる。 When the actuator 3ba (or clip 3bc) is operated to advance the writing instrument main body 3, the shoulder portion 3baa (or shoulder portion 3bba) of the actuator 3ba (or clip actuator 3bb) is provided inside the rear barrel 2b. The ball-point pen tip 3aa protrudes from the front end opening of the front barrel 2a. The shoulder portion 3baa and the shoulder portion 3bba protrude in the chord direction within the cylindrical rear barrel 2b, and engage with the front end portion of the gripped protrusion 2bd that is adjacent to one writing instrument main body 3 in the circumferential direction. Become.

何れかの筆記具本体3の突出状態で、没入状態にある他の作動子3ba(又はクリップ3bc)を操作し前進させると、突出状態にある筆記具本体3の作動子3ba(又はクリップ3bc)と、前進した作動子3ba(又はクリップ3bc)とが当接する。そして、突出状態にある筆記具本体3の作動子3ba(又はクリップ3bc)と、被挟持突起3bdとの係止が解除され、突出状態にあった筆記具本体3のボールペンチップ3aaが軸筒2内部に没入する。以上の一連の操作により、使用者は任意の筆記具本体3を選択し、ボールペン1を筆記可能に使用することができる。 When one of the writing instrument main bodies 3 is in a protruded state, and the other operating element 3ba (or clip 3bc) in the retracted state is operated and advanced, the operating element 3ba (or clip 3bc) of the writing instrument main body 3 in the protruding state, The advanced actuator 3ba (or clip 3bc) abuts. Then, the actuator 3ba (or clip 3bc) of the writing instrument main body 3 in the projecting state is unlocked from the gripped projection 3bd, and the ballpoint pen tip 3aa of the writing instrument main body 3 in the projecting state is inserted into the barrel 2. Immerse yourself. Through the series of operations described above, the user can select an arbitrary writing instrument main body 3 and use the ballpoint pen 1 for writing.

図6は尾栓7の外観斜視図である。後軸2bの後端には、軸筒2後端開口部としての後端開口部2bbが設けられている。後端開口部2bbから軸筒2内部に、各筆記具本体3を配置することができる。後端開口部2bbは、尾栓7が取り付けられることで閉塞する。 6 is an external perspective view of the tail plug 7. FIG. A rear end opening 2bb as a rear end opening of the barrel 2 is provided at the rear end of the rear shaft 2b. Each writing instrument main body 3 can be arranged inside the barrel 2 from the rear end opening 2bb. The rear end opening 2bb is closed by attaching the tail plug 7 .

後軸2bには、後端開口部2bbを形成する縁部と、窓孔2baを形成する縁部とが連接して形成された切り欠き部2bcが設けられている。切り欠き部2bcが設けられていることで、クリップ用作動子3bbにクリップ3bcを取り付けた状態の筆記具本体3を後端開口部2bbからスムーズに挿入することができる。 The rear shaft 2b is provided with a notch 2bc formed by connecting an edge forming the rear end opening 2bb and an edge forming the window hole 2ba. Since the notch 2bc is provided, the writing instrument main body 3 with the clip 3bc attached to the clip actuator 3bb can be smoothly inserted from the rear end opening 2bb.

尾栓7は有底筒状の部材である。尾栓7の前方には、挿入部7aが設けられている。挿入部7aは、尾栓7のうち、後軸2bの後端開口部2bbから挿入される部分である。挿入部7aの外壁面には窓孔突起7abが2か所に設けられている。挿入部7aが後端開口部2bbに挿入されると、最終的に各窓孔突起7abが各窓孔2baを構成する縁部の後端面に係止し、尾栓7aの後方への脱落が防止されて取り付けられる。 The tail plug 7 is a cylindrical member with a bottom. An insertion portion 7 a is provided in front of the tail plug 7 . The insertion portion 7a is a portion of the tail plug 7 that is inserted from the rear end opening 2bb of the rear shaft 2b. Two window hole projections 7ab are provided on the outer wall surface of the insertion portion 7a. When the insertion portion 7a is inserted into the rear end opening 2bb, each window hole projection 7ab finally engages with the rear end surface of the edge forming each window hole 2ba, preventing the tail plug 7a from falling off rearward. Prevented and installed.

挿入部7aには挟持突起7aaが設けられている。挟持突起7aaは、挿入部7aのうち、前後方向前方に延びる突起であり、2本設けられている。 A clamping protrusion 7aa is provided in the insertion portion 7a. Two clamping protrusions 7aa are provided in the insertion portion 7a and extend forward in the front-rear direction.

図7は、尾栓7を後端開口部2bbに取り付けた状態の断面図である。図面奥側に尾栓7が位置する、前方から見た構図となっている。後軸2b内壁面に、切り欠き部2bcと連接した窓孔2baを形成する縁部を周方向に跨いで、挟持突起7aaにより周方向に挟持される被挟持突起が設けられている。被挟持突起2bdは、後軸2b内壁面から突出した前後方向に延びる突起である。被挟持突起2bdの径方向内側先端部分はそれぞれ二又に分かれている。 FIG. 7 is a cross-sectional view of the tail plug 7 attached to the rear end opening 2bb. The composition is viewed from the front, with the tail plug 7 positioned on the back side of the drawing. On the inner wall surface of the rear axle 2b, a clamped protrusion circumferentially clamped by the clamping protrusion 7aa is provided, straddling the edge forming the window hole 2ba connected to the notch 2bc in the circumferential direction. The clamped protrusion 2bd is a protrusion that protrudes from the inner wall surface of the rear shaft 2b and extends in the front-rear direction. The radially inner tip portions of the clamped protrusions 2bd are each bifurcated.

挿入部7aが後端開口部2bbから挿入されると、挟持突起7aaが被挟持突起2bdを周方向に挟持する。被挟持突起2bdの径方向内側先端部分の二又のうち、切り欠き部2bc及び切り欠き部2bcと連接した窓孔2baを形成する縁部に近い一方が、挟持突起7aaの周方向内側の側壁によって挟持される。切り欠き部2bcを形成する縁部は、後軸2bの成形後に周方向に離間して開口しやすくなるところ、被挟持突起2bdは、切り欠き部2bcと連接した窓孔2ba縁部を周方向に跨いで2本設けられている。これにより、尾栓7を取り付けると、当該窓孔2baを形成する縁部が周方向に開くのを防ぐことができ、尾栓7を後端開口部2bbに安定して取り付けることができ好ましい。当該窓孔2baを形成する縁部が周方向に開こうとすると、挟持突起7aaが被挟持突起2bdを挟持する周方向の力が強くなり好ましい。 When the insertion portion 7a is inserted from the rear end opening 2bb, the clamping protrusion 7aa clamps the clamped protrusion 2bd in the circumferential direction. Of the two prongs of the radially inner tip portion of the clamped protrusion 2bd, the one closer to the cutout 2bc and the edge forming the window hole 2ba connected to the cutout 2bc is the circumferentially inner side wall of the clamping protrusion 7aa. sandwiched by The edge forming the notch 2bc is spaced apart in the circumferential direction after molding of the rear barrel 2b so that it can be easily opened. 2 are provided straddling the . Accordingly, when the tail plug 7 is attached, the edge forming the window hole 2ba can be prevented from opening in the circumferential direction, and the tail plug 7 can be stably attached to the rear end opening 2bb, which is preferable. When the edge forming the window hole 2ba tries to open in the circumferential direction, the clamping protrusion 7aa clamps the clamped protrusion 2bd in the circumferential direction, which is preferable.

本実施形態のように、肩部3baを有し円筒状の後軸2bの弦方向に幅広なクリップ用作動子3bbを用いる場合、後軸2b内において、クリップ用作動子3bbが配置された筆記具本体3が収容され、かつ、前後動するための空間としては、周方向及び弦方向に広さを要するため、挟持突起7aaによって窓孔2baを形成する縁部が周方向に開くのを防ぐことができ好ましい。 When using the clip actuator 3bb which has a shoulder portion 3ba and is wide in the chord direction of the cylindrical rear barrel 2b as in the present embodiment, the clip actuator 3bb is arranged in the rear barrel 2b. Since the space in which the main body 3 is accommodated and which moves back and forth needs to be wide in the circumferential direction and the chord direction, it is necessary to prevent the edges forming the window holes 2ba from being opened in the circumferential direction by the clamping projections 7aa. is possible and preferable.

また、挟持突起7aaの前端が、挿入部7aのうち最も前方に位置し、挿入部7aの前端となっている。これにより、尾栓7を後端開口部2bbに取り付ける際に、挿入部7aののうち挟持突起7aaを、軸筒2に最も先に接触させることができ、取り付け作業を開始するのとほぼ同時に被挟持突起2bdを挟持させることができる。よって、取り付け作業の開始直後に取り付けの強度が発生するため、尾栓7を後端開口部2bbに安定して取り付けることができ好ましい。 Further, the front end of the clamping projection 7aa is located at the frontmost position in the insertion portion 7a and serves as the front end of the insertion portion 7a. As a result, when attaching the tail plug 7 to the rear end opening 2bb, the clamping protrusion 7aa of the insertion portion 7a can be brought into contact with the shaft tube 2 first, and almost at the same time as the attachment work is started. The clamped projection 2bd can be clamped. Therefore, since the attachment strength is generated immediately after the attachment work is started, the tail plug 7 can be stably attached to the rear end opening 2bb, which is preferable.

図8は、緩衝部材4の外観斜視図である。緩衝部材4はブチルゴムからなる軟質な部材である。緩衝部材4は、後方に延びる挿入部4aと、前方に位置する緩衝部4bとで構成されている。緩衝部4bの後方端面から挿入部4aが後方に延びている。尾栓7の挿入部7aの径方向内側には、緩衝部材4を取り付ける際に挿入部4aを挿入するための空間が設けられている。挿入部4aの外壁には前後方向に亘って径方向内側に凹んだ溝部4aaが設けられている。挿入部4aが挿入される空間を形成している、尾栓7の挿入部7aの内壁面には、前後方向に延びる内部リブ7acが設けられている。溝部4aaが内部リブ7acに沿うことで、緩衝部材4の周方向の位置決めをすることができ、組み立て性が向上し好ましい。 8 is an external perspective view of the cushioning member 4. FIG. The buffer member 4 is a soft member made of butyl rubber. The cushioning member 4 is composed of an insertion portion 4a extending rearward and a cushioning portion 4b positioned forward. The insertion portion 4a extends rearward from the rear end face of the buffer portion 4b. A space for inserting the insertion portion 4a when attaching the cushioning member 4 is provided inside the insertion portion 7a of the tail plug 7 in the radial direction. The outer wall of the insertion portion 4a is provided with a groove portion 4aa recessed radially inward in the front-rear direction. An internal rib 7ac extending in the front-rear direction is provided on the inner wall surface of the insertion portion 7a of the tail plug 7, which forms a space into which the insertion portion 4a is inserted. It is preferable that the groove portion 4aa extends along the internal rib 7ac so that the cushioning member 4 can be positioned in the circumferential direction, and the ease of assembly is improved.

各筆記具本体3を、突出状態から没入状態にする際に、筆記具本体3が軸筒2内部を後方に移動すると、作動子3ba又はクリップ用作動子3bbの後端が、緩衝部材4の前端である緩衝部4bと当接する。緩衝部材4が軟質であるため、作動子3ba又はクリップ用作動子3bbとの衝突音が小さくなり好ましい。 When each writing instrument main body 3 is moved from the protruding state to the retracted state, when the writing instrument main body 3 moves backward inside the barrel 2 , the rear end of the actuator 3 ba or the clip actuator 3 bb is moved to the front end of the cushioning member 4 . It abuts on a certain buffer portion 4b. Since the cushioning member 4 is soft, the collision noise with the operating element 3ba or the clip operating element 3bb is reduced, which is preferable.

図9は区画部材5の外観斜視図、図10は区画部材5の縦断面図、図11は後軸2b縦断面の前方拡大図、図12は図11のC部分拡大図である。区画部材5は、軸筒2内部に取り付けられる部材である。本実施形態では後軸2bの内部に取り付けられている。 9 is an external perspective view of the partition member 5, FIG. 10 is a longitudinal sectional view of the partition member 5, FIG. 11 is an enlarged front view of a longitudinal section of the rear axle 2b, and FIG. The partitioning member 5 is a member attached inside the barrel 2 . In this embodiment, it is mounted inside the rear axle 2b.

区画部材5は、後方に延びる区画突起5aと、前方に延びる筒部5bとで構成されている。区画突起5aは、筒部5bの後方端面から後方に延び、径方向先端が三又に分かれた突起である。筒部5bには、前後方向に貫通し、ボールペンリフィル3aが挿通するための貫通孔5baが設けられている。本実施形態では、筆記具本体3の数に合わせて3か所に貫通孔5baが設けられている。筒部5bの後方端面であって、各貫通孔5baの開口部近傍に、各コイルスプリング6の前端が当接する。各ボールペンリフィル3aが軸筒2内部を前後動するに際し、貫通孔5baの内壁及び、区画突起5aの側壁によって、径方向に互いに干渉しなくなる。よって、各ボールペンリフィル3aの前後動がよりスムーズになり好ましい。 The partitioning member 5 is composed of a rearwardly extending partitioning projection 5a and a forwardly extending cylindrical portion 5b. The partition projection 5a is a projection extending rearward from the rear end surface of the cylindrical portion 5b and having a radial tip divided into three. The tubular portion 5b is provided with a through hole 5ba that penetrates in the front-rear direction and through which the ballpoint pen refill 3a is inserted. In this embodiment, three through-holes 5ba are provided in accordance with the number of writing instrument main bodies 3. As shown in FIG. The front end of each coil spring 6 abuts near the opening of each through hole 5ba on the rear end surface of the cylindrical portion 5b. When the ballpoint pen refills 3a move back and forth inside the barrel 2, they do not interfere with each other in the radial direction due to the inner wall of the through hole 5ba and the side wall of the partition projection 5a. Therefore, the back and forth movement of each ballpoint pen refill 3a becomes smoother, which is preferable.

筒部5bの外壁には、前後方向に亘って径方向内側に凹んだ溝部5bbが、周方向等間隔に3か所設けられている。区画部材5を後軸2bの内部に取り付ける際に、溝部5bbが後軸2b内壁面であって前後方向に延びるリブ2beに沿って取り付けられることで、区画部材5の周方向の位置決めをすることができ、組み立て性が向上し好ましい。 The outer wall of the cylinder portion 5b is provided with three groove portions 5bb that are recessed radially inward in the front-rear direction at equal intervals in the circumferential direction. When the partitioning member 5 is attached to the inside of the rear axle 2b, the partitioning member 5 is positioned in the circumferential direction by attaching the grooves 5bb along the ribs 2be on the inner wall surface of the rear axle 2b and extending in the front-rear direction. It is possible to improve the assembling performance, which is preferable.

筒部5bの外壁面には径方向に鍔状に突出した周状突起5bcが設けられている。本実施形態においては、筒部5bの後方端面が周状突起5bcの側壁のうち後方端面を構成する位置に周状突起5bcが設けられている。 A circumferential protrusion 5bc protruding in the radial direction in the shape of a flange is provided on the outer wall surface of the cylindrical portion 5b. In this embodiment, the circumferential projection 5bc is provided at a position where the rear end surface of the cylindrical portion 5b constitutes the rear end surface of the side wall of the circumferential projection 5bc.

後軸2bの内壁面には、区画部材5を取り付けた際に、周状突起5bcを挿入可能な周状溝部2bfが設けられている。周状溝部2bfは、側壁面2bfaと、前後方向に沿った底面2bfbと、それらの連接部2bfcとで形成されている。周状溝部2bfに周状突起5beが挿入されると、後軸2b内壁面のうち、周状溝部2bfを形成し、周状突起5bcと前後方向で当接する側壁面2bfaによって、区画部材5が前後動不可能に取り付けられる。 The inner wall surface of the rear shaft 2b is provided with a circumferential groove portion 2bf into which the circumferential projection 5bc can be inserted when the partition member 5 is attached. The circumferential groove portion 2bf is formed of a side wall surface 2bfa, a bottom surface 2bfb along the front-rear direction, and a connecting portion 2bfc thereof. When the circumferential projection 5be is inserted into the circumferential groove portion 2bf, the partitioning member 5 is separated by the side wall surface 2bfa that forms the circumferential groove portion 2bf in the inner wall surface of the rear axle 2b and contacts the circumferential projection 5bc in the front-rear direction. Mounted so that it cannot move back and forth.

側壁面2bfaと底面2bfbとの連接部2bfcは、曲面になっている。両側壁面2bfaの径方向両端部と、底面2bfbの前後方向中央とを直線で結んだ場合、当該直線が径方向外側に突出した形状の曲面となっている。 A connecting portion 2bfc between the side wall surface 2bfa and the bottom surface 2bfb is a curved surface. When the both ends of the side wall surface 2bfa in the radial direction and the center of the bottom surface 2bfb in the front-rear direction are connected by a straight line, the straight line protrudes radially outward to form a curved surface.

ここで、後軸2bはポリカーボネート樹脂の成形品である。筆記具を構成する各部品は、樹脂を金型で成形した樹脂成形品を用いるのが一般的である。例えば後軸2bのような筒状の部材であれば、円筒状の空洞が設けられたキャビティに、キャビティの空洞より小径の円柱状のピンが、挿入及び/又は配置される。キャビティとピンとの間に材料となる樹脂を流し込み、樹脂が固まりピンを引き抜くと、樹脂が所望の形状の成型品となり筒状の部材とすることができる。 Here, the rear axle 2b is a polycarbonate resin molding. Generally, resin molded products obtained by molding resin with a metal mold are used for each part constituting a writing instrument. For example, in the case of a cylindrical member such as the rear shaft 2b, a cylindrical pin having a smaller diameter than the cavity is inserted and/or arranged in a cavity provided with a cylindrical cavity. A material resin is poured between the cavity and the pin, and when the resin solidifies and the pin is pulled out, the resin becomes a molded product having a desired shape, and a tubular member can be obtained.

周状溝部2bfを形作るには、ピンの外壁面から突出した周状の突起が必要なところ、当該突起部分はピンを引き抜く際に、所謂アンダーカットとなり、後軸2bの螺子部が設けられた前端開口部側内壁面と当接し、削ってしまう恐れがある。 In order to form the circumferential groove portion 2bf, a circumferential projection protruding from the outer wall surface of the pin is required. There is a risk that it will come into contact with the inner wall surface on the front end opening side and be scraped off.

本実施形態では、ピンを引き抜く方向である前方と、後方との両方の連設部2bfcを曲面としている。つまり、ピンの外壁面における周状溝部2bfを形作る突起部分の外壁面も対応した形状の曲面となっている。これにより、ピンを引き抜く際に当該突起部分と後軸2b内壁面との当接が滑らかになり、後軸2b内壁面が削られてしまうのを抑制することができる。ひいては、後軸2bを所望の寸法範囲内で成形しやすくなるため、区画部材5を後軸2bに所望の強度で取り付けることができ好ましい。 In this embodiment, both the front and rear connecting portions 2bfc, which are the directions in which the pin is pulled out, are curved. That is, the outer wall surface of the protruding portion forming the circumferential groove 2bf on the outer wall surface of the pin is also curved in a corresponding shape. As a result, when the pin is pulled out, the contact between the projecting portion and the inner wall surface of the rear axle 2b becomes smooth, and the inner wall surface of the rear axle 2b can be prevented from being scraped off. As a result, it becomes easier to form the rear barrel 2b within a desired size range, which is preferable because the partitioning member 5 can be attached to the rear barrel 2b with a desired strength.

連接部2bfcが1箇所でも曲面になっていればその分だけピンと後軸2b内壁面との当接を滑らかにすることができる。本実施形態では、ピンを後軸2bの前端開口部から引き抜く構成としているが、当該開口部に対して遠い方の連接部2bfc(後軸2b後端開口部側)も曲面としている。ピンを引き抜く際に、前端開口部に対して近い方の連接部2bfcを形作る突起部分の外壁面が、後軸2b内壁面と当節しつつ引き抜かれると、後軸2b内壁面は一度径方向外側に広げられ、その後元の寸法に戻ろうとする。この時、前端開口部に対して遠い方の連接部2bfcを形作る突起部分の外壁面が曲面であるとで、後軸2bが径方向内側に戻る際に角になっている部分と当接せずに済むため、後軸2b内壁面が削られてしまうのをより抑制することができ好ましい。 If even one connecting portion 2bfc has a curved surface, the contact between the pin and the inner wall surface of the rear axle 2b can be smoothed accordingly. In this embodiment, the pin is pulled out from the front end opening of the rear axle 2b, but the connecting portion 2bfc (the rear end opening side of the rear axle 2b) farther from the opening is also curved. When the pin is pulled out, the outer wall surface of the protrusion forming the connecting portion 2bfc closer to the front end opening is pulled out while being in contact with the inner wall surface of the rear shaft 2b. It expands outward and then tries to return to its original dimensions. At this time, since the outer wall surface of the projecting portion forming the connecting portion 2bfc farther from the front end opening is curved, the rear shaft 2b comes into contact with the angled portion when returning radially inward. Therefore, it is possible to further suppress the inner wall surface of the rear axle 2b from being scraped, which is preferable.

後軸2bの材質としては他に、成形性や耐久性などを考慮して、ポリプロピレン樹脂、アクリル樹脂、ポリエチレン樹脂、ポリアミド樹脂、ポリブチレンテレフタレート樹脂、ポリブチレンナフタレート樹脂、ポリエチレンナフタレート樹脂、塩化ビニル樹脂、エチレンビニルアルコール共重合体、ポリアクリロニトリル樹脂、フッ素樹脂、ポリアセタール樹脂、ポリエチレンテレフタレート樹脂、ポリスチレン樹脂、ABS樹脂、シリコーン樹脂、エラストマー、又は、これらの樹脂を含む複合材などを適宜選択することができる。 Other materials for the rear axle 2b include polypropylene resin, acrylic resin, polyethylene resin, polyamide resin, polybutylene terephthalate resin, polybutylene naphthalate resin, polyethylene naphthalate resin, chloride resin, etc., in consideration of moldability and durability. Vinyl resin, ethylene vinyl alcohol copolymer, polyacrylonitrile resin, fluororesin, polyacetal resin, polyethylene terephthalate resin, polystyrene resin, ABS resin, silicone resin, elastomer, composite material containing these resins, etc. can be done.

1 ボールペン
2 軸筒
2a 前軸
2b 後軸
2ba 窓孔
2bb 後端開口部
2bc 切り欠き部
2bd 被挟持突起
2be リブ
2bf 周状溝部
2bfa 側壁面
2bfb 底面
2bfc 連接部
3 筆記具本体
3a ボールペンリフィル
3aa ボールペンチップ
3ba 作動子
3baa 肩部
3bb クリップ用作動子
3bba 肩部
3bc クリップ
4 緩衝部材
4a 挿入部
4aa 溝部
4b 緩衝部
5 区画部材
5a 区画突起
5b 筒部
5ba 貫通孔
5bb 溝部
5bc 周状突起
6 コイルスプリング
7 尾栓
7a 挿入部
7aa 挟持突起
7ab 窓孔突起
7ac 内部リブ
REFERENCE SIGNS LIST 1 ballpoint pen 2 barrel 2a front barrel 2b rear barrel 2ba window hole 2bb rear end opening 2bc notch 2bd pinched projection 2be rib 2bf circumferential groove 2bfa side wall surface 2bfb bottom surface 2bfc connecting portion 3 writing instrument main body 3a ballpoint pen refill 3aa ballpoint pen tip 3ba Actuator 3baa Shoulder 3bb Actuator for clip 3bba Shoulder 3bc Clip 4 Cushioning member 4a Insertion portion 4aa Groove 4b Cushioning portion 5 Partitioning member 5a Partitioning projection 5b Cylinder 5ba Penetration hole 5bb Groove 5bc Circumferential projection 6 Coil spring 7 Tail Plug 7a Insertion portion 7aa Clamping projection 7ab Window hole projection 7ac Internal rib

Claims (2)

軸筒内部に、前端に筆記部が設けられた筆記具本体が前後動可能に配置され、筆記具本体後端には作動子が配置され、軸筒側壁には軸筒内部と軸筒外部とを貫通し、前後方向に延びる窓孔が設けられ、作動子の一部が窓孔を介して軸筒外部に露出し、当該一部を前後動させることで筆記部を軸筒前端開口部から出没させることができる出没式筆記具であって、軸筒後端開口部に尾栓が取り付けられ、尾栓前方には軸筒後端開口部に挿入される挿入部が設けられ、挿入部には少なくとも2本の突起からなる挟持突起が設けられ、軸筒後端開口部を形成する縁部と、窓孔を形成する縁部と、が連接して形成する切り欠き部が設けられ、軸筒内壁面に、切り欠き部と連接した窓孔を形成する縁部を周方向に跨いで、挟持突起により周方向に挟持される被挟持突起が設けられた、出没式筆記具。 A writing instrument body having a writing part at the front end is arranged in the barrel so as to be movable back and forth, an actuator is arranged at the rear end of the writing instrument body, and the inside and outside of the barrel penetrate through the barrel side wall. A window hole extending in the front-rear direction is provided, and a part of the actuator is exposed to the outside of the barrel through the window hole. The retractable writing instrument has a tail plug attached to the rear end opening of the barrel, and an insertion portion inserted into the rear end opening of the barrel is provided in front of the tail plug, and the insertion portion has at least two A clamping protrusion consisting of a protrusion is provided, and a notch formed by connecting the edge forming the rear end opening of the barrel and the edge forming the window hole is provided, and the inner wall surface of the barrel is provided. (2) a retractable writing instrument provided with a clamped projection that is circumferentially clamped by the clamping projections, straddling the edge forming the window hole connected to the notch in the circumferential direction; 前記挟持突起の前端が、前記挿入部の前端である請求項1に記載の出没式筆記具。 2. The retractable writing instrument according to claim 1, wherein the front end of said clamping projection is the front end of said insertion portion.
JP2022131432A 2021-08-31 2022-08-22 Retractable writing instrument Pending JP2023035916A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021141543 2021-08-31
JP2021141543 2021-08-31

Publications (1)

Publication Number Publication Date
JP2023035916A true JP2023035916A (en) 2023-03-13

Family

ID=85505117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2022131432A Pending JP2023035916A (en) 2021-08-31 2022-08-22 Retractable writing instrument

Country Status (1)

Country Link
JP (1) JP2023035916A (en)

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