JP2023070970A

JP2023070970A - writing instrument

Info

Publication number: JP2023070970A
Application number: JP2021183485A
Authority: JP
Inventors: 雅也山田; Masaya Yamada
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2023-05-22

Abstract

To provide a writing instrument capable of preventing backlash of a writing body without the need to attach parts to the writing body.SOLUTION: Provided is a writing instrument that allows a writing body to move forward and backward in an axial direction by means of an operation portion and a knock spring provided in a barrel. A holding member having a slit formed in the axial direction is provided on the tip side of the barrel. In a state in which the writing portion at the tip of the writing body protrudes from the tip of the barrel, the circumference of the slit forming portion is reduced in diameter by the pressure of the knock spring, and the holding member holds the writing portion at the tip of the writing body.SELECTED DRAWING: Figure 1

Description

本発明はノック式ボールペンやシャープペンシル等の筆記体が軸筒先端から出没可能な筆記具に関する。 TECHNICAL FIELD The present invention relates to a writing instrument such as a knock-type ballpoint pen or a mechanical pencil in which a writing body can protrude from the tip of a barrel.

ノック式筆記具においては、摺動性を確保するため、筆記部と軸筒との間にわずかながら隙間が形成されている。隙間によって筆記時に筆記体がガタついた場合、快適な筆記を阻害する。 In a knock-type writing instrument, a slight gap is formed between the writing part and the barrel in order to ensure slidability. When the cursive body rattles during writing due to the clearance, comfortable writing is hindered.

このようなガタ防止技術に関して、特許文献１は、単色ボールペンの筆記部（ボールペンチップ）のガタを抑制するため、リフィル（筆記体）側にガタ防止部材（チャック部材）を一体に配設した筆記具を提案している。 Regarding such a backlash prevention technique, Patent Document 1 discloses a writing instrument in which a backlash prevention member (chuck member) is integrally disposed on the refill (writing body) side in order to suppress the backlash of the writing portion (ballpoint pen tip) of a monochromatic ballpoint pen. is proposing.

特開２０１３－２１６０１５号公報JP 2013-216015 A

しかしながら、前記従来の技術では、リフィル等の筆記体側にガタ防止部材を装着する必要がり、利便性に欠けていた。 However, in the above-described conventional technique, it is necessary to attach a looseness prevention member to the side of the writing body such as a refill, which lacks convenience.

本発明は、斯かる実情に鑑み、筆記体に部品を装着する必要なく筆記体のガタ防止が可能な筆記具を提供しようとするものである。 SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to provide a writing instrument capable of preventing looseness of the writing body without the need to attach any parts to the writing body.

本発明は、軸筒に備えた操作部とノックスプリングにより筆記体が軸線方向に進退動可能な筆記具において、軸筒先端側に、軸線方向に形成されたスリットを有する保持部材を設け、筆記体先端の筆記部が軸筒先端から突出した状態において、ノックスプリングの押圧によってスリット形成部の周囲が縮径して、保持部材が筆記体先端の筆記部を保持することを特徴とする筆記具である。 The present invention relates to a writing instrument in which a writing body can be moved forward and backward in the axial direction by an operating portion and a knock spring provided in a barrel, wherein a holding member having a slit formed in the axial direction is provided on the distal end side of the barrel, and the writing body The writing instrument is characterized in that, in a state in which the writing part at the tip protrudes from the tip of the barrel, the circumference of the slit forming part is reduced in diameter by pressure of the knock spring, and the holding member holds the writing part at the tip of the writing body. .

本発明において、ノックスプリングには、外径部より小径な小径部を形成したことが好適である。 In the present invention, it is preferable that the knock spring has a small-diameter portion having a smaller diameter than the outer-diameter portion.

本発明において、軸筒の先端部の内面に傾斜面を形成し、保持部材の先端部の外周に傾斜部を形成し、ノックスプリングによる保持部材の前進に伴い、傾斜部と先端部内面の傾斜面との接触により、保持部材の内面が筆記部外面に係止することが好適である。 In the present invention, an inclined surface is formed on the inner surface of the distal end portion of the barrel, and an inclined portion is formed on the outer periphery of the distal end portion of the holding member. Preferably, the inner surface of the holding member engages the outer surface of the writing section by contact with the surface.

本発明において、ノックスプリングは、軸線方向の中央部に小径部を備え、小径部が保持部材の後端部を前方に向けて押圧することによって、保持部材が前進することが好適である。 In the present invention, it is preferable that the knock spring has a small-diameter portion in the center portion in the axial direction, and the small-diameter portion pushes the rear end portion of the holding member forward to move the holding member forward.

本発明において、保持部材は、粘弾性材料からなり、先端側の外周に軸線方向に形成されたスリットを有することが好適である。 In the present invention, it is preferable that the holding member is made of a viscoelastic material and has a slit axially formed on the outer circumference of the distal end side.

本発明において、ノックスプリングは、外径部の内側に小径部を備えた二重構造であり、ノックスプリングの小径部が保持部材の後端部を押圧することによって、保持部材が変形して筆記体先端の筆記部に係止することが好適である。 In the present invention, the knock spring has a double structure in which the small diameter portion is provided inside the outer diameter portion. It is preferable to engage the writing part at the tip of the body.

本発明において、軸筒先端部の内面部に後方に突出した保持部材を軸筒に一体に構成し、ノックスプリングの小径部により保持部材が内径方向に変形して筆記体先端の筆記部を保持可能にしたことが好適である。 In the present invention, a holding member protruding rearward from the inner surface of the distal end of the barrel is integrally formed with the barrel, and the small diameter portion of the knock spring deforms the holding member in the inner diameter direction to hold the writing portion at the tip of the writing body. It is preferable to allow

本発明の筆記具によれば、筆記体先端の筆記部が軸筒先端から突出した状態において、ノックスプリングの押圧によってスリット形成部の周囲が縮径して、保持部材が筆記体先端の筆記部を保持するので、筆記体に部品を装着する必要なく筆記体のガタ防止が可能になるという優れた効果を奏し得る。 According to the writing instrument of the present invention, in a state in which the writing part at the tip of the writing body protrudes from the tip of the barrel, the circumference of the slit forming part is reduced in diameter by the pressure of the knock spring, and the holding member moves the writing part at the tip of the writing body. Since it is held, there is an excellent effect that it is possible to prevent looseness of the writing body without the need to attach parts to the writing body.

本発明の第１実施形態に係る筆記具の非ノック状態の説明図であって、（ａ）が正面図、（ｂ）が（ａ）から９０°軸回転させた側面図、（ｃ）が（ａ）のＣ－Ｃ線に沿う縦断面図、（d）が先端部の拡大断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the non-knocking state of the writing instrument which concerns on 1st Embodiment of this invention, (a) is a front view, (b) is a side view rotated 90 degrees from (a), (c) is ( A) is a vertical cross-sectional view taken along line CC, and (d) is an enlarged cross-sectional view of the tip. 同筆記具のノック状態の説明図であって、（ａ）が正面図、（ｂ）が（ａ）から９０°軸回転させた側面図、（ｃ）が（ａ）のＣ－Ｃ線に沿う縦断面図、（d）が先端部の拡大断面図である。It is an explanatory view of the knocked state of the writing instrument, (a) is a front view, (b) is a side view rotated 90 ° from (a), and (c) is along the CC line of (a). Fig. 4(d) is an enlarged cross-sectional view of the tip. 同筆記具の保持部材の部品図であって、（ａ）が前方からの斜視図、（ｂ）が前方視図、（ｃ）が一側面からの視図、（ｄ）が（ｃ）から９０°軸回転させた側面図、（ｅ）が（ｃ）のＥ－Ｅ線縦断面図、（ｆ）が他側面からの視図、（ｇ）が後方からの斜視図、（ｈ）が後方視図である。It is a part view of the holding member of the writing instrument, (a) is a perspective view from the front, (b) is a front view, (c) is a view from one side, (d) is 90 from (c) A side view rotated by °, (e) is a vertical cross-sectional view along the EE line of (c), (f) is a view from the other side, (g) is a perspective view from the rear, (h) is the rear It is a perspective view. 同筆記具のノックスプリングの部品図であって、（ａ）が側面図、（ｂ）が前方からの斜視図である。It is a part drawing of the knock spring of the same writing instrument, Comprising: (a) is a side view, (b) is a perspective view from the front. 同筆記具の口先部（先軸）の部品図であって、（ａ）が前方からの斜視図、（ｂ）が前方視図、（ｃ）が側面図、（ｄ）が（ｃ）のＤ－Ｄ線縦断面図、（ｅ）が後方からの斜視図、（ｆ）が後方視図である。It is a part view of the tip (front barrel) of the writing instrument, (a) is a perspective view from the front, (b) is a front view, (c) is a side view, and (d) is D of (c). -D line longitudinal sectional view, (e) is a perspective view from the rear, and (f) is a rear view. 本発明の第２実施形態に係る筆記具の非ノック状態の説明図であって、（ａ）が正面図、（ｂ）が（ａ）から９０°軸回転させた側面図、（ｃ）が（ａ）のＣ－Ｃ線に沿う縦断面図、（ｄ）が先端部の拡大断面図である。It is explanatory drawing of the non-knocking state of the writing instrument which concerns on 2nd Embodiment of this invention, (a) is a front view, (b) is a side view rotated 90 degrees from (a), (c) is ( A) is a vertical cross-sectional view taken along line CC, and (d) is an enlarged cross-sectional view of the tip. 同筆記具のノック状態の説明図であって、（ａ）が正面図、（ｂ）が（ａ）から９０°軸回転させた側面図、（ｃ）が（ａ）のＣ－Ｃ線に沿う縦断面図、（d）が先端部の拡大断面図である。It is an explanatory view of the knocked state of the writing instrument, (a) is a front view, (b) is a side view rotated 90 ° from (a), and (c) is along the CC line of (a). Fig. 4(d) is an enlarged cross-sectional view of the tip. 同筆記具の保持部材の部品図であって、（ａ）が前方からの斜視図、（ｂ）が前方視図、（ｃ）が一側面からの視図、（ｄ）が（ｃ）から９０°軸回転させた側面図、（ｅ）が（ｃ）のＥ－Ｅ線縦断面図、（ｆ）が後方からの斜視図、（ｇ）が後方視図である。It is a part view of the holding member of the writing instrument, (a) is a perspective view from the front, (b) is a front view, (c) is a view from one side, (d) is 90 from (c) Fig. 3(e) is a longitudinal sectional view taken along the line EE of Fig. 3(c); Fig. 3(f) is a perspective view from the rear; 同筆記具のノックスプリングの部品図であって、（ａ）が側面図、（ｂ）が前方からの斜視図である。It is a part drawing of the knock spring of the same writing instrument, Comprising: (a) is a side view, (b) is a perspective view from the front. 本発明の第３実施形態に係る筆記具の非ノック状態の説明図であって、（ａ）が正面図、（ｂ）が縦断面図、（ｃ）が先端部の拡大断面図である。FIG. 11 is an explanatory view of the non-knocking state of the writing instrument according to the third embodiment of the present invention, where (a) is a front view, (b) is a vertical cross-sectional view, and (c) is an enlarged cross-sectional view of the tip. 同筆記具のノック状態の説明図であって、（ａ）が正面図、（ｂ）が縦断面図、（ｃ）が先端部の拡大断面図である。It is explanatory drawing of the knock state of the same writing instrument, Comprising: (a) is a front view, (b) is a longitudinal cross-sectional view, (c) is an enlarged sectional view of a front-end|tip part. 同筆記具の先軸の部品図であって、（ａ）が正面図、（ｂ）が後方視図、（ｃ）が（ａ）から９０°軸回転させた側面図、（ｄ）が前方視図、（ｅ）が（ａ）のＥ－Ｅ線縦断面図、（ｆ）が先端部分の断面図、（ｇ）が先端部分の断面斜視図である。It is a part view of the front barrel of the writing instrument, (a) is a front view, (b) is a rear view, (c) is a side view rotated 90° from (a), and (d) is a front view. Figure, (e) is a vertical cross-sectional view taken along line EE of (a), (f) is a cross-sectional view of the tip portion, and (g) is a cross-sectional perspective view of the tip portion. 同筆記具のノックスプリングの部品図であって、（ａ）が前方からの斜視図、（ｂ）が側面図である。It is a part view of the knock spring of the same writing instrument, (a) is a perspective view from the front, (b) is a side view.

以下、本発明の実施形態について添付図面を参照して説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

［第１実施形態］
第１実施形態に係る筆記具について、図１～図５を用いて説明する。図１は非ノック状態、図ｃ２はノック状態の筆記具を示す。図３は保持部材、図４はノックスプリング、図５は口先部（先軸）の各部品図である。 [First embodiment]
A writing instrument according to a first embodiment will be described with reference to FIGS. 1 to 5. FIG. FIG. 1 shows the writing instrument in the non-knocking state, and FIG. c2 shows the writing instrument in the knocking state. 3 is a holding member, FIG. 4 is a knock spring, and FIG. 5 is a drawing of each part of the nose (front barrel).

図１～図２に示すように、筆記具は、軸筒１０に備えた操作部１２とノックスプリング１４により筆記体１６が軸線方向に進退動可能な筆記具に関するものである。 As shown in FIGS. 1 and 2, the writing instrument relates to a writing instrument in which a writing body 16 can move forward and backward in the axial direction by means of an operating portion 12 and a knock spring 14 provided in a barrel 10. FIG.

筆記具は、軸筒１０先端側に、軸線方向に形成された複数の溝、所謂スリット１８ａ…を有する保持部材１８を設け、筆記体１６先端の筆記部２０が軸筒１０先端の口先部（先軸）２２の開口２２ａから突出した状態において、ノックスプリング１４の押圧によってスリット形成部である前部１８ｆの周囲が縮径して、保持部材が筆記体１６先端の筆記部２０の外面に係止して保持するものである。 The writing instrument is provided with a holding member 18 having a plurality of grooves, so-called slits 18a, formed in the axial direction on the distal end side of the barrel 10. In the state in which the shaft 22 protrudes from the opening 22a, the periphery of the front portion 18f, which is the slit forming portion, is reduced in diameter by the pressure of the knock spring 14, and the holding member is engaged with the outer surface of the writing portion 20 at the tip of the writing body 16. and hold it.

又、軸筒１０の先端側の口先部２２内面に傾斜面２２ｂを形成し、保持部材１８の先端部の外周に傾斜部１８ｄを形成し、ノック状態時には、ノックスプリング１４による保持部材１８の前進に伴い、傾斜部１８ｄと先端部の口先部２２内面の傾斜面２２ｂとの接触により、保持部材１８の内面１８ｂが筆記部２０外面に係止する構造となっている。 An inclined surface 22b is formed on the inner surface of the nose portion 22 on the tip side of the barrel 10, and an inclined portion 18d is formed on the outer periphery of the tip portion of the holding member 18, and the holding member 18 is advanced by the knock spring 14 in the knocked state. Accordingly, the inner surface 18b of the holding member 18 is engaged with the outer surface of the writing unit 20 by contact between the inclined portion 18d and the inclined surface 22b of the inner surface of the tip portion 22 of the tip portion.

又、ノックスプリング１４は、軸線方向の中央部に小径部１４ｂを備え、図２に示すように、ノック状態時には、小径部１４ｂが保持部材１８の後端部を前方に向けて押圧することによって、保持部材１８が前進する構造となっている。 The knock spring 14 has a small-diameter portion 14b in the center in the axial direction, and as shown in FIG. , the holding member 18 advances.

各部を詳細に説明する。
〔軸筒１０〕
軸筒１０は、図１に示すように、全体が概略筒状であり、前端部に口先部（「先軸）とも称する）２２に固定される。軸筒１０の前端側外周に形成された雄ネジのネジ部１０ａに、口先部２２の後端側内周の雌ネジのネジ部２２ｃが螺合することによって、軸筒１０前端側に口先部２２が固定されている。軸筒１０のネジ部１０ａより後方部分の外周面には、それを覆うように、エラストマー等の弾性樹脂部材からなるすべり止めのグリップカバー２４が外嵌される。軸筒１０や後軸２６は硬質な樹脂製である。 Each part will be explained in detail.
[Axle cylinder 10]
As shown in Fig. 1 , the barrel 10 has a generally tubular shape as a whole, and is fixed to a nose portion (also referred to as a "front barrel") 22 at its front end. The tip portion 22 is fixed to the front end side of the barrel 10 by screwing the screw portion 22c of the female screw on the inner circumference of the rear end side of the tip portion 22 into the screw portion 10a of the male screw. A non-slip grip cover 24 made of an elastic resin member such as elastomer is fitted around the outer peripheral surface of the rear portion of the threaded portion 10a so as to cover it. is.

〔後軸２６〕
軸筒１０の後部には、後軸２６の概略筒状の本体２６ｂが後方から装着されている。本体２６ｂ前部の外周面の凹凸が軸筒１０内周面の凹凸に係合して軸筒１０が後軸２６に固定されている。後軸２６後部の外周には、ポケット等に掛け止め用のクリップ２６ａが軸筒１０後部外周に接するように本体２６ｂに一体成形されている。 [Rear axle 26]
A substantially cylindrical main body 26b of the rear axle 26 is attached to the rear portion of the barrel 10 from behind. The unevenness on the outer peripheral surface of the front portion of the main body 26b engages with the unevenness on the inner peripheral surface of the barrel 10 so that the barrel 10 is fixed to the rear shaft 26 . A clip 26a for latching onto a pocket or the like is formed integrally with the main body 26b so as to be in contact with the outer circumference of the rear portion of the barrel 10. As shown in FIG.

後軸２６の後端開口から操作部１２が後方に突出して配置されている。後軸２６の後部内には、操作部１２は、後軸２６に対する係合部１２ａと、係合部１２ａを覆うカバー部１２ｂと、カバー部１２ｂを後方に付勢するスプリング等からなるノック機構である。ノック機構は周知のカーンノック式の他種々のノック機構を用いることができる。 The operating portion 12 is arranged to protrude rearward from the rear end opening of the rear shaft 26 . In the rear portion of the rear axle 26, the operating portion 12 includes an engaging portion 12a for the rear axle 26, a cover portion 12b covering the engaging portion 12a, and a knock mechanism including a spring or the like for biasing the cover portion 12b rearward. is. As the knock mechanism, a well-known Khan knock type or other various knock mechanisms can be used.

〔筆記体１６〕
軸筒１０内に進退動可能に装着された筆記体１６は、先端の筆記部２０に後部のインクチューブ２８が継手３０によって結合されたものである。 [Cursive 16]
A writing body 16 mounted in the barrel 10 so as to move forward and backward has a writing portion 20 at its tip and an ink tube 28 at its rear portion connected by a joint 30 .

筆記体１６は、筆記部２０、インクチューブ（インク収容部）２８及び継手３０が一体的なリフィル（リフィール）であり、インクチューブ２８がインク切れしたら新しいリフィルに交換可能である。 The writing body 16 is a refill that integrates the writing section 20, the ink tube (ink containing section) 28, and the joint 30, and can be replaced with a new refill when the ink tube 28 runs out of ink.

筆記部２０は、筒体２０ａの先端に筆記ボール２０ｂが嵌められたボールペンチップであって、筒体２０ａの内部には、筆記ボール押圧用のスプリング２０ｃが装着されている。筆記部２０の各部は、金属製又は樹脂製から形成できる。 The writing part 20 is a ball-point pen tip in which a writing ball 20b is fitted to the tip of a cylindrical body 20a, and a spring 20c for pressing the writing ball is mounted inside the cylindrical body 20a. Each part of the writing unit 20 can be made of metal or resin.

インクチューブ２８は、インクを収容し、その後端部が操作部１２の前端に当接している。 The ink tube 28 contains ink, and its rear end abuts the front end of the operating section 12 .

継手３０は、前部３０ａが単筒状であってそこに筆記部２０が内装されて固定されると共に、後部３０ｂが二重筒状であって二重筒状の間にインクチューブ２８が装着されて固定される。後部３０ｂは、前部３０ａよりも段部３０ｂ’から拡径している。図１、図２に示すように、段部３０ｂ’には、ノックスプリング１４の後端が当接し、ノックスプリング１４によって筆記体１６が後方に向けて付勢されている。 The joint 30 has a single tubular front portion 30a into which the writing unit 20 is housed and fixed, and a double tubular rear portion 30b between which the ink tube 28 is mounted. fixed. The rear portion 30b widens from the stepped portion 30b' more than the front portion 30a. As shown in FIGS. 1 and 2, the rear end of the knock spring 14 abuts against the stepped portion 30b', and the writing element 16 is urged rearward by the knock spring 14. As shown in FIGS.

〔保持部材１８〕
保持部材１８は、図３に示すように、前部１８ｆと環状の突起１８ｃを境に拡径した後部１８ｒとを有し、全体が概略筒状体のものである。前部１８ｆは、先端側から中央部の突起１８ｃ付近まで、軸線方向に切り込んだ３箇所（複数の例）のスリット１８ａ…を有するスリット形成部となる。 [Holding member 18]
As shown in FIG. 3, the holding member 18 has a front portion 18f and a rear portion 18r whose diameter is enlarged at an annular projection 18c, and is generally cylindrical as a whole. The front portion 18f serves as a slit forming portion having three (a plurality of examples) slits 18a cut in the axial direction from the tip side to the vicinity of the protrusion 18c in the central portion.

前部１８ｆの先端の外周には、面取りされたような傾斜部１８ｄが形成される。前部１８ｇの先端は傾斜部１８ｄに対応する部分が内側に突出しており、前部１８ｆが縮径した際に突出箇所の内面１８ｂが筆記部２０外面に係止する部分となる（図２参照）。 A chamfered inclined portion 18d is formed on the outer circumference of the tip of the front portion 18f. A tip of the front portion 18g projects inward at a portion corresponding to the inclined portion 18d, and when the diameter of the front portion 18f is reduced, the inner surface 18b of the projecting portion becomes a portion that engages with the outer surface of the writing portion 20 (see FIG. 2). ).

〔ノックスプリング１４〕
ノックスプリング１４は、図１、図２、図４に示すように、外径部１４ａより小径な小径部１４ｂを形成したものである。ノックスプリング１４は、軸線方向に前部及び後部が大径の外径部１４ａであり、それらに挟まれた中央部が外径部１４ａの巻径よりも小径の巻径となっている小径部１４ｂを構成する。ノックスプリング１４は、同一径の金属等の弾性線材が巻かれて形成されたものであり、外径部１４ａは、小径部１４ｂに比較して軸方向に巻長さが長く、かつ巻密度が粗である。 [Knock spring 14]
The knock spring 14, as shown in FIGS. 1, 2 and 4, has a small diameter portion 14b having a smaller diameter than the outer diameter portion 14a. The knock spring 14 has outer diameter portions 14a with large diameters at the front and rear portions in the axial direction, and a small diameter portion with a winding diameter smaller than that of the outer diameter portion 14a at the central portion sandwiched between them. 14b. The knock spring 14 is formed by winding an elastic wire such as metal having the same diameter. Rough.

〔口先部２２〕
口先部２２は、軸筒１０の先端側に固定されて軸筒１０と一体化して先端部をなす。 [Mouth part 22]
The tip portion 22 is fixed to the tip side of the barrel 10 and integrated with the barrel 10 to form the tip portion.

図５に詳細に示すように、口先部２２は、中空の概略筒状であって、外周面は、前部２２ｆが後部２２ｒよりも先細りの弾頭形状を呈する。 As shown in detail in FIG. 5, the proboscis 22 has a substantially hollow cylindrical shape, and the outer peripheral surface has a warhead shape in which the front portion 22f is tapered more than the rear portion 22r.

内周面は、先端の開口２２ａから後部の内面のネジ部２２ｃにかけて段階的に拡径している。 The inner peripheral surface gradually increases in diameter from an opening 22a at the tip to a threaded portion 22c on the inner surface at the rear.

口先部２２において、その先端の開口２２ａは断面円形であり、開口２２ａから軸線方向後方に同様の断面円形の空洞が形成されている。開口から空洞の形成された部分を開口部２２ａ’と称する。開口部２２ａ’は空洞内に筆記部２０を通過させる開口２２ａから筆記部２０の先端部を出没させるものであり（図２参照）、 The nose portion 22 has an opening 22a at its tip with a circular cross-section, and a cavity with a similar circular cross-section is formed axially rearward from the opening 22a. A portion where a cavity is formed from the opening is referred to as an opening 22a'. The opening 22a' allows the tip of the writing unit 20 to protrude from the opening 22a through which the writing unit 20 passes through the cavity (see FIG. 2).

又、口先部２２の内部において、図５に示すように、開口部２２ａ’の後端が段状に拡径して後方拡がりのテーパ状に傾斜面２２ｂが形成される。傾斜面２２ｂからネジ部２２ｃの間には、断面円形の複数の空洞が形成され、保持部材１８が内装されて摺動する保持部材摺動部２２ｄ、ノックスプリング１４の内装されるスプリング収容部２２ｅが形成される（図１、図２、図５参照）。 As shown in FIG. 5, inside the tip portion 22, the rear end of the opening portion 22a' is stepped to form a tapered surface 22b that expands rearward. Between the inclined surface 22b and the threaded portion 22c, a plurality of cavities having a circular cross section are formed. is formed (see FIGS. 1, 2 and 5).

保持部材摺動部２２ｄとスプリング収容部２２ｅは、主に口先部２２の前部２２ｆの内部に段差２２ｅ’を境に形成される。保持部材摺動部２２ｄ内部は、前部よりも後部が段差２２ｄ’を介して拡径して形成されており、段差２２ｄ’の前部は後部よりも短く形成される。スプリング収容部２２ｅは、段差２２ｅ’を介して保持部材摺動部２２よりも拡径している。段差２２ｅ’の内周部には、非ノック状態で（図１参照）保持部材１８の外周部の突起１８ｃが係合する保持部材１８の抜け止めをする環状のリブ２２ｇが内向きに突出形成される。 The holding member sliding portion 22d and the spring accommodating portion 22e are formed mainly inside the front portion 22f of the proboscis portion 22 with a step 22e' as a boundary. Inside the holding member sliding portion 22d, the rear portion is formed with a larger diameter than the front portion through a step 22d', and the front portion of the step 22d' is formed shorter than the rear portion. The spring accommodating portion 22e has a larger diameter than the holding member sliding portion 22 via a step 22e'. An annular rib 22g protrudes inward from the inner peripheral portion of the step 22e' to prevent the holding member 18 from coming off, which is engaged with the protrusion 18c on the outer peripheral portion of the holding member 18 in the non-knocked state (see FIG. 1). be done.

スプリング収容部２２ｅは、図１、図２に示すように、段差２２ｅ’の後面側にノックスプリング１４の前端を当接させる機能を有する。 As shown in FIGS. 1 and 2, the spring accommodating portion 22e has the function of bringing the front end of the knock spring 14 into contact with the rear surface side of the step 22e'.

〔第１実施形態の筆記具の作用〕
筆記具においては、ノックスプリング１４が軸筒１０の前端部及び口先部２２内に位置している。 [Operation of the writing implement of the first embodiment]
In the writing instrument, a knock spring 14 is located within the front end and nose 22 of barrel 10 .

操作部１２をノック操作しない状態では、図１に示すように、ノックスプリング１４の前端が口先部２２内においてスプリング収容部２２ｅの段差２２ｅ’（後面側）に当接し、一方、ノックスプリング１４の後端が筆記体１６の継手３０の段部３０ｂ’の前端面に当接している。この状態でノックスプリング１４は、その弾性力によって段部３０ｂ’から継手３０を介して筆記体１６を後方に向けて押圧する。 When the operation portion 12 is not knocked, the front end of the knock spring 14 abuts on the step 22e' (rear side) of the spring accommodating portion 22e in the nose portion 22, as shown in FIG. The rear end is in contact with the front end surface of the stepped portion 30b' of the joint 30 of the writing body 16. As shown in FIG. In this state, the knock spring 14 presses the writing body 16 rearward through the joint 30 from the stepped portion 30b' by its elastic force.

したがって、非ノック状態の筆記具は、筆記体１６が後方に位置し、筆記部２０が口先部２２の先端開口２２ａから突出せず、没入している状態に維持している。 Therefore, in the non-knocking state of the writing instrument, the writing body 16 is positioned backward, and the writing section 20 does not protrude from the tip opening 22a of the tip section 22, but is kept in a recessed state.

一方、操作部１２を前方に向けてノック操作すると、図２に示すように、筆記体１６先端の筆記部２０が軸筒１０先端の口先部（先軸）２２の開口２２ａから突出する。 On the other hand, when the operating portion 12 is knocked forward, the writing portion 20 at the tip of the writing body 16 protrudes from the opening 22a of the tip (front barrel) 22 at the tip of the barrel 10, as shown in FIG.

この際、ノックスプリング１４は、軸線方向の中央部に小径部１４ｂを備えているので、小径部１４ｂが保持部材１８の後端部を前方に向けて押圧することによって、保持部材１８が前進する。このノックスプリング１４による保持部材１８の前進に伴い、保持部材１８の傾斜部１８ｄと軸筒１０先端部の口先部２２内面の傾斜面２２ｂとの接触により、スリット形成部である前部１８ｆの周囲が縮径して、保持部材１８の内面１８ｂが筆記体１６先端の筆記部２０の外面に係止して筆記部２０のガタつかないように保持する。つまり、ノック時には、ノックスプリング１４の中央部の小径部１４ｂの密着バネによって保持部材１８を口先部２２内に圧入し筆記部２０を係止する構造になっている。 At this time, since the knock spring 14 has the small-diameter portion 14b in the central portion in the axial direction, the small-diameter portion 14b pushes the rear end portion of the holding member 18 forward, thereby moving the holding member 18 forward. . As the holding member 18 advances by the knock spring 14, the contact between the inclined portion 18d of the holding member 18 and the inclined surface 22b on the inner surface of the nose portion 22 at the distal end of the shaft cylinder 10 causes the periphery of the front portion 18f, which is the slit-forming portion, to move forward. is reduced in diameter, and the inner surface 18b of the holding member 18 engages with the outer surface of the writing portion 20 at the tip of the writing body 16 to hold the writing portion 20 so as not to rattle. That is, when knocking, the holding member 18 is press-fitted into the tip portion 22 by the contact spring of the small-diameter portion 14b at the central portion of the knock spring 14, and the writing portion 20 is locked.

したがって、ノック時には、筆記部２０を保持部材１８で把持して筆記体１６の振動抑制ができる。 Therefore, when knocking, the writing part 20 can be held by the holding member 18 to suppress the vibration of the writing body 16 .

［第２実施形態］
次に、第２実施形態に係る筆記具について、図６～図９を用いて説明する。図６は非ノック状態、図７はノック状態の筆記具を示す。図８は保持部材、図９はノックスプリングの各部品図である。図１～図５と同様部分に同一符号を付する。 [Second embodiment]
Next, a writing instrument according to a second embodiment will be described with reference to FIGS. 6 to 9. FIG. FIG. 6 shows the writing instrument in the non-knocking state, and FIG. 7 shows the writing instrument in the knocking state. FIG. 8 is a drawing of the holding member, and FIG. 9 is a drawing of each part of the knock spring. Parts similar to those in FIGS. 1 to 5 are denoted by the same reference numerals.

図６～図７に示すように、筆記具は、軸筒１０に備えた操作部１２とノックスプリング４２により筆記体１６が軸線方向に進退動可能な筆記具に関するものである。 As shown in FIGS. 6 and 7, the writing instrument relates to a writing instrument in which a writing body 16 can move forward and backward in the axial direction by means of an operating portion 12 and a knock spring 42 provided in a barrel 10. FIG.

軸筒１０先端側に、シリコーンゴム等の粘弾性材料からなり、先端側の外周に複数のスリット４０ａ…が形成された保持部材４０を設けたものである。 A holding member 40 made of a viscoelastic material such as silicone rubber is provided on the distal end side of the barrel 10 and has a plurality of slits 40a formed on the outer periphery of the distal end side.

筆記体１６先端の筆記部２０が軸筒１０先端から突出した状態において、ノックスプリング４２の押圧によってスリット形成部である前部４０ｆの周囲が縮径して、保持部材４０が筆記体１６先端の筆記部２０を保持する。 In a state where the writing part 20 at the tip of the writing body 16 protrudes from the tip of the barrel 10, the pressure of the knock spring 42 reduces the diameter of the front part 40f, which is the slit forming part, and the holding member 40 moves the tip of the writing body 16. Hold the writing unit 20 .

保持部材４０は、図８に示すように前部４０ｆの先端側の外周部に複数のスリット４０ａ…が軸線方向に形成され、内周部に複数の凹凸からなる溝部４０ｃが軸線方向に沿って形成される。 As shown in FIG. 8, the holding member 40 has a plurality of slits 40a formed in the outer peripheral portion on the tip side of the front portion 40f in the axial direction, and a groove portion 40c formed of a plurality of unevenness in the inner peripheral portion along the axial direction. It is formed.

後部４０ｒの外周部後端には、フランジ４０ｄが拡径して形成され、内周部は前部４０ｆの内周部に比較して段差部４０ｅから拡径して断面円形に平坦に形成される。前部４０ｆの先端の外周には、面取りされたような傾斜部４０ｇが形成される。 A flange 40d is formed at the rear end of the outer peripheral portion of the rear portion 40r with an enlarged diameter. be. A chamfered inclined portion 40g is formed on the outer circumference of the tip of the front portion 40f.

ノックスプリング４２は、図６、図７、図９に示すように、径方向の外側に外径部４２ａを位置させ外径部４２ａより小径な小径部４２ｂを内側に位置させて二重構造に形成したものである。ノックスプリング４２は、軸線方向に外側に外径部４２ａを、内側に小径部４２ｂを構成し、各後端４２ａ’、４２ｂ’で連続して折り返したような構成になっている。ノックスプリング１４は、同一径の金属等の弾性線材が巻かれて連続的に形成されたものであり、外径部４２ａは、小径部４２ｂに比較して軸方向に巻長さが長く構成されている。 As shown in FIGS. 6, 7 and 9, the knock spring 42 has a double structure in which an outer diameter portion 42a is positioned radially outward and a small diameter portion 42b smaller than the outer diameter portion 42a is positioned inner. It is formed. The knock spring 42 has an outer diameter portion 42a on the outside and a small diameter portion 42b on the inside in the axial direction, and is continuously folded back at rear ends 42a' and 42b'. The knock spring 14 is formed by continuously winding an elastic wire such as a metal having the same diameter. ing.

非ノック状態の筆記具は、図６に示すように、ノックスプリング４２の外径部４２ａの段発力で筆記体１６が後方に位置し、筆記部２０が口先部２２の先端開口２２ａから突出せず、没入している状態に維持している。 In the non-knocking state of the writing instrument, as shown in FIG. 6, the stepping force of the outer diameter portion 42a of the knock spring 42 causes the writing body 16 to be positioned rearward and the writing part 20 to protrude from the tip opening 22a of the tip portion 22. It is maintained in a state of immersion.

一方、操作部１２を前方に向けてノック操作すると、図７に示すように、筆記体１６先端の筆記部２０が軸筒１０先端の口先部（先軸）２２の開口２２ａから突出する。 On the other hand, when the operating portion 12 is knocked forward, the writing portion 20 at the tip of the writing body 16 protrudes from the opening 22a of the tip (front barrel) 22 at the tip of the barrel 10, as shown in FIG.

この際、ノックスプリング４２は、小径部４２ｂが保持部材４０の後端部を前方に向けて押圧することによって、保持部材４０が前進する。このノックスプリング４２による保持部材４０の前進に伴い、保持部材４０の傾斜部４０ｇと軸筒１０先端部の口先部２２内面の傾斜面２２ｂとの接触により、前部４０ｆのスリット形成部の周囲が弾性変形して縮径して、前部４０ｆの内周面が筆記体１６先端の筆記部２０の外面に緊密に係止し、筆記部２０のガタつかないように保持する。前部４０ｆの内周面は、溝部４０ｃによって容易に縮径して筆記部２０を緊密に把持することができる。 At this time, the small-diameter portion 42b of the knock spring 42 presses the rear end portion of the holding member 40 forward, thereby causing the holding member 40 to move forward. As the holding member 40 advances due to the knock spring 42, the inclined portion 40g of the holding member 40 and the inclined surface 22b of the inner surface of the nose portion 22 at the distal end of the shaft cylinder 10 contact each other, causing the periphery of the slit forming portion of the front portion 40f to move. The inner peripheral surface of the front portion 40f is elastically deformed and reduced in diameter, and the inner peripheral surface of the front portion 40f is tightly locked to the outer surface of the writing portion 20 at the tip of the writing body 16, thereby holding the writing portion 20 so as not to rattle. The inner peripheral surface of the front portion 40f can be easily reduced in diameter by the groove portion 40c so that the writing portion 20 can be tightly gripped.

なお、ノックスプリング４２は、図６に示すように、非ノック時には、保持部材４０から離隔しており、ノックオン時のみに小径部４２ｂが保持部材４０を押圧して口先部２２の傾斜面２２ｂに圧入して、保持部材４０を小径に変形するため筆記部２０の外面に緊密に把持してホールドできる。筆記時の筆記部２０のガタ付きを効果的に防止できる。保持部材４０の粘弾性率を設定することによって、筆記感の柔らかさを容易に設定することができる。 As shown in FIG. 6, the knock spring 42 is separated from the holding member 40 when not knocked, and the small diameter portion 42b presses the holding member 40 only when knocked on, and the inclined surface 22b of the nose portion 22 is pushed. By press-fitting, the holding member 40 is deformed to have a small diameter, so that it can be tightly grasped and held on the outer surface of the writing unit 20 . The rattling of the writing part 20 during writing can be effectively prevented. By setting the viscoelastic modulus of the holding member 40, the softness of the writing feeling can be easily set.

［第３実施形態］
次に第３実施形態に係る記具について、図１０～図１３を用いて説明する。図１０は非ノック状態、図１１はノック状態の筆記具を示す。図１２は口先部、図１３はノックスプリングの各部品図である。図１～図５と同様部分に同一符号を付する。 [Third embodiment]
Next, a marking tool according to a third embodiment will be described with reference to FIGS. 10 to 13. FIG. FIG. 10 shows the writing instrument in the non-knocking state, and FIG. 11 shows the writing instrument in the knocking state. FIG. 12 is a drawing of the nose portion, and FIG. 13 is a drawing of each part of the knock spring. Parts similar to those in FIGS. 1 to 5 are denoted by the same reference numerals.

筆記具は、図１０～図１１に示すように、軸筒１０先端部の口先部（先軸）４４の内面部に後方に突出した保持部材４６を一体に構成し、ノックスプリング４８の小径部４８ｂにより保持部材４６が内径方向に変形して筆記体１６先端の筆記部２０を保持可能にしたものである。なお筆記部２０内にはスプリングは省略しているが、スプリングは配置してもしなくてもよい。 As shown in FIGS. 10 and 11, the writing instrument has a holding member 46 integrally formed on the inner surface of a tip (front barrel) 44 at the tip of the barrel 10, and a small diameter portion 48b of a knock spring 48. As a result, the holding member 46 is deformed in the inner diameter direction so that the writing part 20 at the tip of the writing body 16 can be held. Although the spring is omitted in the writing section 20, the spring may or may not be arranged.

口先部（先軸）４４は図１０～図１２に示すように、筆記具全体の半ばまで形成されており軸筒１０の先端部に嵌合して固定している。口先部４４の内面部に後方に向けて突出して形成された保持部材４６は、複数の板部が後方に向けて突出して、板部間にスリット４６ａ…が形成されたスリット形成部４６ｂとなる。保持部材４６の後端側外周面に傾斜部４６ｃが形成されている。 As shown in FIGS. 10 to 12, the tip (front barrel) 44 is formed up to the middle of the entire writing instrument, and is fitted and fixed to the tip of the barrel 10 . A holding member 46 formed to protrude rearward from the inner surface portion of the tip portion 44 has a plurality of plate portions protruding rearward to form a slit forming portion 46b in which slits 46a are formed between the plate portions. . An inclined portion 46 c is formed on the rear end side outer peripheral surface of the holding member 46 .

ノックスプリング４８は、図１３に示すように、軸線方向に前部及び後部が大径の外径部４８ａであり、それらに挟まれた中央部が小径部４８ｂを構成する。外径部４８ａの後部４８ａ２が前部４８ａ１より長くかつ密に巻かれて形成されている。小径部４８ｂは後部４８ｂ２よりもさらに密に巻かれている。 As shown in FIG. 13, the knock spring 48 has outer diameter portions 48a with large diameters at the front and rear portions in the axial direction, and a small diameter portion 48b at the central portion sandwiched between them. The rear portion 48a2 of the outer diameter portion 48a is longer than the front portion 48a1 and is tightly wound. The small diameter portion 48b is more tightly wound than the rear portion 48b2.

筆記具においては、非操作状態では、図１０に示すように、ノックスプリング４８によって筆記体１６が後方に押圧され筆記部２０が没入した状態に維持している。 In the non-operating state of the writing instrument, as shown in FIG. 10, the knock spring 48 pushes the writing body 16 rearward and maintains the writing part 20 in the retracted state.

一方、操作部１２を前方に向けてノック操作すると、図１１に示すように、筆記体１６先端の筆記部２０が軸筒１０先端の口先部（先軸）２２の開口２２ａから突出する。 On the other hand, when the operating portion 12 is knocked forward, the writing portion 20 at the tip of the writing body 16 protrudes from the opening 22a of the tip (front barrel) 22 at the tip of the barrel 10, as shown in FIG.

この際、ノックスプリング４８は、軸線方向の中央付近に小径部４８ｂを備えているので、小径部４８ｂが保持部材４６の後端部を前方に向けて押圧し、傾斜部４６ｃに当接してスリット４６ａが狭まってスリット形成部４６ｂが変形して縮径する。保持部材４６が筆記体１６先端の筆記部２０の外面に係止して筆記部２０のガタつかないように保持することができる。 At this time, since the knock spring 48 has a small diameter portion 48b near the center in the axial direction, the small diameter portion 48b presses the rear end portion of the holding member 46 forward and abuts against the inclined portion 46c to open the slit. 46a narrows and the slit forming part 46b is deformed and reduced in diameter. The holding member 46 can be engaged with the outer surface of the writing part 20 at the tip of the writing body 16 to hold the writing part 20 so as not to rattle.

なお、上述の各実施形態は本発明の各具体例であるが、本発明の範囲内で種々に変形実施できる。各部の材質や硬度を適宜の選択できる。 Although each of the above-described embodiments is a specific example of the present invention, various modifications can be made within the scope of the present invention. The material and hardness of each part can be selected as appropriate.

本発明の筆記具は、ボールペンやシャープペンシルなどのノック式の筆記具に利用することができる。 The writing instrument of the present invention can be used as a retractable writing instrument such as a ballpoint pen and a mechanical pencil.

１０軸筒
１２操作部
１４ノックスプリング（第１実施形態）
１４ａ外径部
１４ｂ小径部
１６筆記体
１８保持部材（第１実施形態）
１８ａスリット
１８ｂ内面
１８ｄ傾斜部
１８ｆ前部
１８ｒ後部
２２口先部
２２ａ開口
２２ａ’ 開口部
２２ｂ傾斜面
２２ｃネジ部
２２ｄ保持部材摺動部
２２ｅスプリング収容部
２２ｆ前部
２２ｇリブ
２２ｒ後部
４０保持部材（第２実施形態）
４０ａスリット
４０ｃ溝部
４０ｄフランジ
４０ｇ傾斜部
４０ｅ段差部
４０ｆ前部
４０ｒ後部
４２ノックスプリング（第２実施形態）
４２ａ外径部
４２ｂ小径部
４４口先部（第３実施形態）
４４ａ開口
４６保持部材（第３実施形態）
４６ａスリット
４６ｂスリット形成部
４６ｃ傾斜部
４８ノックスプリング（第３実施形態）
４８ａ外径部
４８ａ１前部
４８ａ２後部
４８ｂ小径部 10 Axle cylinder 12 Operation part 14 Knock spring (first embodiment)
14a outer diameter portion 14b small diameter portion 16 writing body 18 holding member (first embodiment)
18a slit 18b inner surface 18d inclined portion 18f front portion 18r rear portion 22 mouth portion 22a opening 22a' opening portion 22b inclined surface 22c screw portion 22d holding member sliding portion 22e spring housing portion 22f front portion 22g rib 22r rear portion 40 holding member (second embodiment)
40a slit 40c groove 40d flange 40g inclined portion 40e stepped portion 40f front portion 40r rear portion 42 knock spring (second embodiment)
42a outer diameter portion 42b small diameter portion 44 mouth portion (third embodiment)
44a opening 46 holding member (third embodiment)
46a slit 46b slit forming portion 46c inclined portion 48 knock spring (third embodiment)
48a outer diameter portion 48a1 front portion 48a2 rear portion 48b small diameter portion

Claims

A writing instrument in which the writing body can move forward and backward in the axial direction by means of an operation part and a knock spring provided in the barrel,
A holding member having a slit formed in the axial direction is provided on the distal end side of the barrel,
A writing instrument characterized in that, in a state in which the writing part at the tip of the writing body protrudes from the tip of the barrel, the circumference of the slit forming part is reduced in diameter by pressure of the knock spring, and the holding member holds the writing part at the tip of the writing body. .

2. The writing instrument according to claim 1, wherein the knock spring is formed with a small diameter portion smaller in diameter than the outer diameter portion.

forming an inclined surface on the inner surface of the tip of the barrel, forming an inclined portion on the outer periphery of the tip of the holding member,
3. The writing instrument according to claim 2, wherein the inner surface of the holding member engages the outer surface of the writing section due to contact between the inclined portion and the inclined surface of the inner surface of the tip portion as the holding member advances due to the knock spring.

3. The writing instrument according to claim 1, wherein the holding member is made of a viscoelastic material and has a slit formed in an axial direction on the outer periphery of the tip side.

A holding member protruding rearward from the inner surface of the tip of the barrel is integrally formed with the barrel, and the small diameter portion of the knock spring deforms the holding member in the inner diameter direction to hold the writing portion at the tip of the writing body. 3. The writing instrument according to claim 2, characterized by: