JP2015009531A - Retractable writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable writing instrument that is improved in sealability in the storage of a writing part and operability in the retraction.SOLUTION: A retractable writing instrument comprises: a belt-shaped member 50 bringing a longitudinal center width portion into contact with a lid member 40 in a closed state from the front side, and extending both end side portions to the barrel backward to be locked to a core unit 20; and an inclined guide part 12 provided in an inner surface of a barrel 10 so as to guide the belt-shaped member 50 when advanced in the forward obliquely radially outward direction. The belt-shaped member 50 when advanced with the core unit 20 is bent in the radially outward direction along the inclined guide part 12, and the lid member 40 and a writing part 22a are made to operate at the barrel center side from the bent belt-shaped member 50.

Description

本発明は、シール筒内に密閉された筆記部を、シール筒前端の蓋部材の開放により突出させるようにした出没式筆記具に関するものである。   The present invention relates to a retractable writing instrument in which a writing section sealed in a seal cylinder is projected by opening a lid member at the front end of the seal cylinder.

通常、マーキングペンやサインペン等では、筆記部の乾燥を簡素な構造によって防止するために、キャップ式構造を採用する場合が多い。しかし、キャップ式筆記具は、キャップの着脱に両手を使うこと、キャップが落下衝撃等で外れてしまうおそれがあること、キャップを引張った際の衝撃でインクが飛散するおそれがあること等、改善の余地を多々有している。   Usually, a marking pen, a sign pen, and the like often employ a cap-type structure in order to prevent the writing part from being dried by a simple structure. However, cap-type writing instruments can be improved by using both hands for attaching and detaching the cap, the cap may be removed due to a drop impact, etc., and the ink may be scattered by the impact when the cap is pulled. There is plenty of room.

そこで、例えば、引用文献１の発明では、軸筒（本体１）と、該軸筒内で進退可能な筆記体（２）と、前記軸筒内にて前記筆記部の前端側の周囲を覆うシール筒（１６）と、該シール筒の前端開口部を開放可能に閉鎖した蓋部材（シール蓋７）と、前記蓋部材を後方へ引っ張る糸状部材（９）と、前記シール筒に対し前記筆記体を後方へ付勢するスプリング（１０）とを備え、前記筆記体を前進させる際には前記糸状部材を緩め弛ませて前記蓋部材を前方へ開放し、前記筆記体を後退させる際には前記糸状部材の張力によって前記蓋部材を閉鎖するようにしている。   Therefore, for example, in the invention of Cited Document 1, the shaft cylinder (main body 1), the writing body (2) that can be advanced and retracted in the shaft cylinder, and the periphery of the front end side of the writing section are covered in the shaft cylinder. The seal cylinder (16), a lid member (seal lid 7) that closes the front end opening of the seal cylinder so as to be openable, a thread-like member (9) that pulls the lid member rearward, and the writing to the seal cylinder A spring (10) for urging the body backward, when the writing body is advanced, the thread-like member is loosened and loosened to open the lid member forward, and when the writing body is retracted The lid member is closed by the tension of the thread-like member.

しかしながら、引用文献１の従来技術では、前記筆記体を突出させる際に、細長い前記糸状部材が弛んで前記筆記体や前記蓋部材、前記スプリング等に絡みついて、作動性を損ねてしまうおそれがある。また、全閉した際の前記蓋部材が前記シール筒に食い付いて、作動不良を生じるおそれもある。   However, in the prior art of the cited document 1, when the writing body is protruded, the elongated thread-like member may be loosened and entangled with the writing body, the lid member, the spring, etc., and the operability may be impaired. . In addition, the lid member when fully closed may bite into the seal tube and cause malfunction.

実開平３−５７０９１号公報Japanese Utility Model Publication No. 3-57091

本発明は上記従来事情に鑑みてなされたものであり、その課題とする処は、筆記部の収納時のシール性及び出没時の動作性を向上することができる出没式筆記具を提供することにある。   This invention is made | formed in view of the said conventional situation, The process made into the subject is providing the retractable writing instrument which can improve the sealing performance at the time of accommodation of a writing part, and the operativity at the time of retracting. is there.

上記課題を解決するための一手段は、軸筒には中芯ユニットが前後動可能に収容され、前記中芯ユニットの先端には筆記部が設けられ、前記中芯ユニットには前記筆記部にインクを供給するインク供給構造が設けられ、前記筆記部の周囲はシール筒及び蓋部材により閉塞され、前記蓋部材は前記筆記部の前方で回動して前記シール筒の前端開口部を開閉するように設けられ、前記蓋部材の前端にはベルト部が係脱可能に係合され、前記シール筒と前記中芯ユニットは、付勢手段により相反方向に付勢され、前記ベルト部には一体的に後方へ延びる係止片部が設けられ、この係止片部は、前記中芯ユニットと係合して前記中芯ユニットの後方への移動を規制するとともに前記中芯ユニットと一体的に前進するように設けられ、前記シール筒は前記軸筒と係合して前方への移動を規制され、前記中芯ユニットの前進により前記ベルト部が前記蓋部材の前端から離脱して前記蓋部材が開放し前記筆記部が前記シール筒から突出するようにしたことを特徴とする。   One means for solving the above problems is that the shaft unit accommodates the core unit so as to be movable back and forth, and a writing part is provided at the tip of the core unit, and the writing unit is provided in the core unit. An ink supply structure for supplying ink is provided, and the periphery of the writing unit is closed by a seal cylinder and a lid member, and the lid member rotates in front of the writing unit to open and close the front end opening of the seal cylinder A belt portion is detachably engaged with the front end of the lid member, and the seal tube and the core unit are urged in opposite directions by urging means, and are integrated with the belt portion. A locking piece portion extending rearward is provided, and the locking piece portion engages with the core unit to restrict the movement of the core unit rearward and is integrated with the core unit. The seal cylinder is provided to move forward The forward movement of the core unit is restricted by engaging with the shaft cylinder, the belt portion is detached from the front end of the lid member by the advancement of the core unit, the lid member is opened, and the writing portion projects from the seal cylinder. It was made to do.

本発明は、以上説明したように構成されているので、筆記部の収納時のシール性及び出没時の動作性を向上することができる。   Since the present invention is configured as described above, it is possible to improve the sealing performance when storing the writing section and the operability when appearing and retracting.

本発明に係る出没式筆記具の一例について、軸筒の片半部を切欠して内部構造を示す斜視図である。It is a perspective view which shows an internal structure about the example of the retractable writing instrument which concerns on this invention by notching the half half part of a shaft cylinder. 同出没式筆記具の側面図である。It is a side view of the same haunting type writing instrument. 軸筒の一例を示す縦断面図であり、（ａ）と（ｂ）は互いに断面方向が９０°異なる。It is a longitudinal cross-sectional view which shows an example of a shaft cylinder, (a) and (b) mutually differ in a cross-sectional direction 90 degrees. ベルト状部材の一例を示す斜視図である。It is a perspective view which shows an example of a belt-shaped member. シール筒の一例について、要部を断面で示す側面図である。It is a side view which shows the principal part in a cross section about an example of a seal cylinder. 同シール筒の一例について、（ａ）は後面図であり、（ｂ）は（ａ）におけるｂ−ｂ断面図である。About an example of the seal cylinder, (a) is a rear view, (b) is a bb sectional view in (a). 中芯ユニットの一例を示す分解斜視図である。It is a disassembled perspective view which shows an example of a center unit. 同出没式筆記具の内部構造図であり、（ａ）は筆記部を没入した初期状態を示し、（ｂ）は中芯ユニット及びベルト状部材を若干前進させた状態を示す。It is an internal structure figure of the same drawing type writing instrument, (a) shows the initial state where the writing part was immersed, and (b) shows the state where the core unit and the belt-like member were advanced a little. 同出没式筆記具の内部構造図であり、（ｃ）はベルト状部材が傾斜状ガイド部に接触した状態を示し、（ｄ）は中芯ユニット及びベルト状部材を更に前進させた状態を示す。It is an internal structure figure of the same drawing type writing instrument, (c) shows the state where the belt-like member contacted the inclined guide part, and (d) shows the state where the core unit and the belt-like member were further advanced. 同出没式筆記具の内部構造図であり、（ｅ）はベルト状部材が被当接部に略当接した状態を示し、（ｆ）は中芯ユニットのみを更に前進させて筆記部を突出させた状態を示す。It is an internal structure figure of the same penetrating type writing instrument, (e) shows a state in which the belt-like member is substantially in contact with the contacted portion, (f) is to further advance only the core unit to project the writing portion Indicates the state.

本実施の形態の第一の特徴は、軸筒には中芯ユニットが前後動可能に収容され、
前記中芯ユニットの先端には筆記部が設けられ、前記中芯ユニットには前記筆記部にインクを供給するインク供給構造が設けられ、前記筆記部の周囲はシール筒及び蓋部材により閉塞され、前記蓋部材は前記筆記部の前方で回動して前記シール筒の前端開口部を開閉するように設けられ、前記蓋部材の前端にはベルト部が係脱可能に係合され、前記シール筒と前記中芯ユニットは、付勢手段により相反方向に付勢され、前記ベルト部には一体的に後方へ延びる係止片部が設けられ、この係止片部は、前記中芯ユニットと係合して前記中芯ユニットの後方への移動を規制するとともに前記中芯ユニットと一体的に前進するように設けられ、前記シール筒は前記軸筒と係合して前方への移動を規制され、前記中芯ユニットの前進により前記ベルト部が前記蓋部材の前端から離脱して前記蓋部材が開放し前記筆記部が前記シール筒から突出するようにした。
この構成によれば、筆記部を没入した初期状態では、閉鎖状態の蓋部材にベルト部が係合し該ベルト部と一体的な係止片部が中芯ユニットに係合し該中芯ユニットがシール筒に対し相反方向へ付勢されているため、振動や衝撃等により蓋部材が開放するのを防ぎ、蓋部材とシール筒との密閉性を良好に維持することができる。
また、中芯ユニットを前進させた際には、シール筒は軸筒との係合により前方への移動が規制され、前進するベルト部が蓋部材の前端から離脱し、蓋部材が開放して筆記部がシール筒から突出する。すなわち、蓋部材に止着した糸状部材を弛ませるようにした従来技術等と異なり、前進するベルト部を蓋部材の前端から離脱するようにしているため、筆記部の突出時の動作性が良好である。 The first feature of the present embodiment is that the shaft unit accommodates the center unit so as to be movable back and forth.
A writing part is provided at a tip of the core unit, an ink supply structure for supplying ink to the writing part is provided in the core unit, and the periphery of the writing part is closed by a seal cylinder and a lid member, The lid member is provided to rotate in front of the writing portion to open and close a front end opening of the seal cylinder, and a belt portion is detachably engaged with the front end of the lid member, And the central core unit is biased in the opposite direction by the biasing means, and the belt portion is provided with a locking piece portion integrally extending rearward, and this locking piece portion is engaged with the central core unit. In addition, the rearward movement of the central core unit is restricted and the forward movement is integrally performed with the central core unit, and the seal cylinder is engaged with the shaft cylinder to be prevented from moving forward. The belt by the advancement of the core unit. There said writing unit disengaged to open said lid member from the front end of the lid member is to protrude from the seal tube.
According to this configuration, in the initial state where the writing unit is immersed, the belt unit is engaged with the lid member in the closed state, and the locking piece unit integrated with the belt unit is engaged with the central unit, and the central unit Is biased in the opposite direction with respect to the seal cylinder, so that the lid member can be prevented from being opened due to vibration or impact, and the sealing performance between the lid member and the seal cylinder can be maintained well.
Further, when the center unit is advanced, the forward movement of the seal cylinder is restricted by the engagement with the shaft cylinder, the advancing belt part is detached from the front end of the lid member, and the lid member is opened. The writing part protrudes from the seal tube. In other words, unlike the prior art in which the thread-like member fixed to the lid member is loosened, the forward belt portion is detached from the front end of the lid member, so the operability when the writing portion protrudes is good. It is.

第二の特徴としては、前記軸筒には傾斜状ガイド部が設けられ、
前記傾斜状ガイド部は、前記中芯ユニットと一体的に前進する前記ベルト部に摺接して、前記ベルト部を径外方向へ撓ませる。
この構成によれば、中芯ユニットと一体的に前進するベルト部を傾斜状ガイド部に摺接させて、該ベルト部を径外方向へスムーズに撓ませることができ、この撓んだベルト部よりも径内方向側で蓋部材及び筆記部を動作させることができる。 As a second feature, the shaft tube is provided with an inclined guide portion,
The inclined guide portion is in sliding contact with the belt portion that moves forward integrally with the core unit to bend the belt portion in the radially outward direction.
According to this configuration, the belt portion that moves forward integrally with the core unit can be slidably contacted with the inclined guide portion, and the belt portion can be smoothly bent radially outward. The lid member and the writing unit can be operated on the radially inner side.

なお、より具体的な好ましい構成としては、前記軸筒の内面に、前記傾斜状ガイド部に沿って前進した際の前記ベルト部を当接させるための被当接部を設け、前記中芯ユニットの前進中、前記蓋部材が開放した後に、前記ベルト部が前記被当接部に当接して前進不能になり、前記中芯ユニットが前記ベルト部に相対し前方へスライドして、前記筆記部が前記軸筒から突出するようにする。
この構成によれば、中芯ユニットが前進する際のストロークを比較的大きく確保でき、ひいては、筆記部を十分に突出させることができる。 In addition, as a more specific preferable configuration, a contacted portion for contacting the belt portion when it moves forward along the inclined guide portion is provided on the inner surface of the shaft tube, and the core unit During the forward movement, after the lid member is opened, the belt portion comes into contact with the contacted portion and cannot move forward, and the core unit slides forward relative to the belt portion, and the writing portion Projecting from the barrel.
According to this configuration, it is possible to ensure a relatively large stroke when the core unit moves forward, and thus it is possible to sufficiently protrude the writing unit.

また、第三の特徴としては、前記蓋部材には規制突部が設けられ、前記規制突部は、前記ベルト部の径外方向への撓みを規制する。
この構成によれば、開放した際の蓋部材が、ベルト部を超えて回動してしまい、閉鎖不能になってしまうようなことを、規制突部によって防ぐことができる。 As a third feature, the lid member is provided with a restriction protrusion, and the restriction protrusion restricts the bending of the belt portion in the radially outward direction.
According to this structure, it can prevent with a control protrusion that the lid member at the time of opening will rotate exceeding a belt part and it will become impossible to close.

なお、より具体的な好ましい構成としては、前記規制突起は、前記蓋部材の前面に、径外方向へ撓んだ際の前記ベルト部に対し、その径外方向側に位置するように設けられる。   As a more specific and preferable configuration, the restriction protrusion is provided on the front surface of the lid member so as to be positioned on the radially outward side with respect to the belt portion when bent in the radially outward direction. .

第四の特徴としては、前記蓋部材は開放方向に付勢されている。
この構成によれば、蓋部材の開放動作性を向上することができる。 As a fourth feature, the lid member is biased in the opening direction.
According to this configuration, the opening operability of the lid member can be improved.

なお、より具体的な好ましい構成としては、前記筆記部が突出する際には、前記蓋部材を、付勢手段の付勢力により開動し、前記筆記部が没入する際には、前記蓋部材を、前記傾斜状ガイド部に沿って後退する前記ベルト部により押し戻して閉動するようにする。   As a more specific and preferred configuration, when the writing portion protrudes, the lid member is opened by the urging force of the urging means, and when the writing portion is retracted, the lid member is Then, the belt portion is moved back along the inclined guide portion to be pushed back to be closed.

また、第五の特徴としては、前記蓋部材の前端面には、前記ベルト部と係脱する係脱片が設けられ、前記係脱片は、前記蓋部材の閉塞時には前記ベルト部と係合している。
この構成によれば、ベルト部と係脱片との係合により、蓋部材の閉鎖性を向上することができる。 As a fifth feature, an engagement / disengagement piece that engages / disengages with the belt portion is provided on a front end surface of the lid member, and the engagement / disengagement piece engages with the belt portion when the lid member is closed. doing.
According to this configuration, the closure of the lid member can be improved by the engagement between the belt portion and the engagement / disengagement piece.

なお、より具体的な好ましい構成としては、前記係脱片を前記ベルト部に対し径方向へ係脱するように設け、前記ベルト部は、前進した際に前記係脱片を引張って前記蓋部材を開放した後で径外方向への移動により前記係脱片から離脱し、後退した際には径内方向への移動により前記係脱片に係合する。
この構成によれば、前進した際のベルト部が係脱片を引張って蓋部材を開放動作させる。したがって、蓋部材がシール筒に食い込んで開放しないようなことを防ぐことができる。 As a more specific preferable configuration, the engaging / disengaging piece is provided so as to be engaged / disengaged in the radial direction with respect to the belt portion, and the belt portion pulls the engaging / disengaging piece when the belt moves forward, and the lid member After being released, it disengages from the engaging / disengaging piece by moving in the radially outward direction, and when retracted, it engages with the engaging / disengaging piece by moving in the radially inward direction.
According to this structure, the belt part at the time of advance pulls the engaging / disengaging piece to open the lid member. Therefore, it is possible to prevent the lid member from biting into the seal cylinder and not opening.

また、更に好ましい構成としては、前記係止片部の後端部側に、前後方向へ連続するスライド係合孔を設け（図４参照）、前記中芯ユニットには、前記スライド係合孔に嵌り合って前後方向へ移動可能な係合突起と、前記係止片部の後端部が当接可能な段部とを設け（図７参照）、前記中芯ユニットの前進中、前記段部が前記係止片部の後端部に当接して前記ベルト部を前進させ（図８（ｂ）及び図９（ｃ）（ｄ）参照）、前記ベルト部の前端部が前記被当接部に当接して前進不能になった後（図１０（ｅ）参照）、前記ベルト部の両後端部が前記段部を乗越えるようにして、前記中芯ユニットのみが前記係合突起を前記スライド係合孔５３ａに沿わせて更に前進し、前記筆記部が前記軸筒から突出するようにした（図１０（ｆ）参照）。
この構成によれば、中芯ユニットが前進する際のストロークを比較的大きくし、筆記部を十分に突出させる具体的構造を提供することがきる。
なお、より好ましくは、前記乗越えの際の摩擦抵抗を軽減するために、前記段部を、後方斜め径外方向へ向く傾斜面状に形成する。 Further, as a more preferable configuration, a slide engagement hole continuous in the front-rear direction is provided on the rear end side of the locking piece (see FIG. 4), and the center core unit is provided with the slide engagement hole. An engaging protrusion that fits and can move in the front-rear direction and a step portion with which the rear end portion of the locking piece portion can come into contact are provided (see FIG. 7). Contacts the rear end of the locking piece to advance the belt (see FIGS. 8B, 9C and 9D), and the front end of the belt is the contacted portion. After the contact with the belt becomes impossible to advance (see FIG. 10 (e)), both the rear end portions of the belt portion get over the stepped portion so that only the core unit has the engagement protrusions. Further advancement was made along the slide engagement hole 53a so that the writing part protruded from the shaft tube (see FIG. 10 (f)).
According to this configuration, it is possible to provide a specific structure in which the stroke when the core unit moves forward is relatively large and the writing unit is sufficiently projected.
More preferably, in order to reduce the frictional resistance at the time of overcoming the step, the stepped portion is formed in an inclined surface shape facing outward in the rearward oblique diameter.

また、更に好ましい構成としては、前記蓋部材の外周部を略円形状に形成する（図６及び図８〜図１０参照）。
この構成によれば、開閉する蓋部材の外周部にベルト部が擦れて、蓋部材の開閉動作に抵抗を生じるようなことを軽減し、蓋部材をスムーズに開閉動作させることができる。 As a more preferable configuration, the outer peripheral portion of the lid member is formed in a substantially circular shape (see FIGS. 6 and 8 to 10).
According to this configuration, it is possible to reduce a situation in which the belt portion is rubbed against the outer peripheral portion of the lid member to be opened and closed, causing resistance to the opening and closing operation of the lid member, and the lid member can be smoothly opened and closed.

次に、上記特徴を有する好ましい実施例を、図面に基づいて詳細に説明する。
なお、以下の説明において、「前」とは、軸筒１０の先端方向（筆記部２２ａが突出する方向）を意味し、「後」とは前記「前」に対する逆方向を意味する。また、「径内方向」とは、軸筒１０の径方向に沿う方向であって、かつ軸筒１０の軸心（中心）へ向かう方向を意味する。また、「径外方向」とは、前記径内方向に対する逆方向を意味する。また、「軸筒軸方向」とは、軸筒１０の軸心（中心）に沿う方向を意味する。 Next, a preferred embodiment having the above features will be described in detail with reference to the drawings.
In the following description, “front” means the tip direction of the shaft tube 10 (the direction in which the writing portion 22a protrudes), and “rear” means the direction opposite to the “front”. The “inner diameter direction” means a direction along the radial direction of the shaft tube 10 and toward the axis (center) of the shaft tube 10. Further, the “outer diameter direction” means a direction opposite to the inner diameter direction. The “axial cylinder axial direction” means a direction along the axial center (center) of the axial cylinder 10.

この出没式筆記具は、軸筒１０と、該軸筒１０内に進退可能に設けられるとともに前端側に筆記部２２ａ（図７参照）を有する中芯ユニット２０と、軸筒１０内にて前記筆記部２２ａの周囲を覆うシール筒３０と、該シール筒３０の前端開口部を閉鎖する蓋部材４０と、長手方向の中央寄り部分を閉鎖状態の蓋部材４０に対し前方側から接触するとともに両端側部分を軸筒後方へ延設して中芯ユニット２０に係止したベルト状部材５０と、前進した際の中芯ユニット２０を軸筒１０に係止し且つこの係止状態を径内方向への押圧により解除可能な係脱機構６０とを備え、中芯ユニット２０の前進に伴い蓋部材４０を前方へ回動して開放し筆記部２２ａをシール筒３０及び軸筒１０から前方へ突出し、中芯ユニット２０の後退に伴い筆記部２２ａをシール筒３０及び軸筒１０へ没入して蓋部材４０を逆方向へ回動して閉鎖する。   This retractable writing instrument is provided with a shaft tube 10, a center unit 20 which is provided in the shaft tube 10 so as to be able to advance and retreat and has a writing portion 22 a (see FIG. 7) on the front end side, and the writing within the shaft tube 10. A seal cylinder 30 that covers the periphery of the portion 22a, a lid member 40 that closes the front end opening of the seal cylinder 30, and a lid member 40 that is in contact with the lid member 40 in a closed state in the longitudinal direction from the front side. The belt-like member 50 that extends to the rear of the shaft cylinder and is locked to the core unit 20, and the core unit 20 that is moved forward is locked to the shaft cylinder 10, and this locked state is inwardly in the radial direction. And an engagement / disengagement mechanism 60 that can be released by pressing, and with the advancement of the core unit 20, the lid member 40 is rotated forward to open, and the writing portion 22a projects forward from the seal tube 30 and the shaft tube 10, As the core unit 20 moves backward, the writing unit 22 And immerses the seal cylinder 30 and the barrel 10 closes by rotating the lid member 40 in the reverse direction.

軸筒１０は、長尺円筒状の部材であり、単一の筒状部材から形成してもよいし、複数の筒状部材を接続することで構成してもよい。
この軸筒１０の前端側には、筆記部２２ａを出没させるための先細筒状の先口部１１が設けられ、該先口部１１よりも後側の内壁面には、後述する二つのベルト状部材５０，５０を、それぞれ前方斜め径外方向へ導く傾斜状ガイド部１２，１２と、傾斜状ガイド部１２，１２に沿って前進した際のベルト状部材５０，５０をそれぞれ当接させるための被当接部１３，１３とを有する。
また、軸筒１０の後部寄りの周壁には、中芯ユニット２０を軸筒１０に係脱する係脱機構６０を構成するようにして、ガイド部１４、被係止部１５、及び操作部１６等が設けられる。また、軸筒１０内の前端側には、シール筒３０前端側の当接突起３３に当接されるガイド凹部１８ａが設けられる。 The shaft cylinder 10 is a long cylindrical member, and may be formed from a single cylindrical member or may be configured by connecting a plurality of cylindrical members.
The front end side of the shaft tube 10 is provided with a tapered cylindrical front end portion 11 for projecting and retracting the writing portion 22a, and two belts to be described later are provided on the inner wall surface on the rear side of the front end portion 11. In order to bring the belt-shaped members 50 and 50 into contact with the inclined guide portions 12 and 12, respectively, which lead the belt-shaped members 50 and 50 forward and obliquely outward, respectively, along the inclined guide portions 12 and 12. Contacted parts 13 and 13.
Further, on the peripheral wall near the rear portion of the shaft tube 10, an engaging / disengaging mechanism 60 for engaging and disengaging the core unit 20 with the shaft tube 10 is configured, so that the guide portion 14, the locked portion 15, and the operation portion 16 are formed. Etc. are provided. Further, a guide recess 18 a that is in contact with the contact protrusion 33 on the front end side of the seal cylinder 30 is provided on the front end side in the shaft cylinder 10.

傾斜状ガイド部１２は、前方へ向かって径外方向へ傾斜した突起面を有する三角形状のカムであり、図３（ｂ）及び図８に示すように、軸筒中心を通る仮想平面を挟むようにして対称に二つ設けられる。これら二つの傾斜状ガイド部１２，１２は、図示例によれば、頂部側を後方へ向けた平面視略Ｖ字状に配設される。   The inclined guide portion 12 is a triangular cam having a projecting surface inclined outward in the radial direction toward the front, and sandwiches a virtual plane passing through the center of the shaft cylinder as shown in FIGS. Thus, two are provided symmetrically. According to the illustrated example, these two inclined guide portions 12 and 12 are arranged in a substantially V shape in plan view with the top side facing rearward.

二つの被当接部１３，１３は、それぞれ、二つの傾斜状ガイド部１２，１２の前端部に交差して径外方向へ延びるとともに、軸筒１０の内面から突出する突起である（図８（ａ）参照）。
なお、傾斜状ガイド部１２，１２及び被当接部１３，１３の径内方向への突出量は、前進した際の筆記部２２ａに干渉しないように適宜に設定されている。 The two contacted portions 13 and 13 are protrusions that intersect the front end portions of the two inclined guide portions 12 and 12 and extend radially outward, respectively, and project from the inner surface of the shaft tube 10 (FIG. 8). (See (a)).
In addition, the protruding amount in the radial direction of the inclined guide portions 12 and 12 and the contacted portions 13 and 13 is appropriately set so as not to interfere with the writing portion 22a when moving forward.

また、ガイド部１４は、図示例によれば、軸筒１０の周壁を貫通して軸筒軸方向へ連続する長孔であり（図１及び図２参照）、後述する被押圧部２５ｂを軸筒軸方向へ導く。
被係止部１５は、軸筒１０の周壁上において、ガイド部１４から前方側に若干離れた位置に設けられた貫通孔であり、後述する被押圧部２５ｂ（詳細には係止突起２５ｂ１）を係止する。 Further, according to the illustrated example, the guide portion 14 is a long hole that penetrates the peripheral wall of the shaft tube 10 and continues in the axial direction of the shaft tube (see FIGS. 1 and 2). Guide in the tube axis direction.
The locked portion 15 is a through hole provided on the peripheral wall of the shaft tube 10 at a position slightly away from the guide portion 14 toward the front side. The pressed portion 25b (specifically, a locking protrusion 25b1) described later. Lock.

操作部１６は、軸筒１０の周壁に、該周壁を径方向へ貫通する有端環状（図示例によれば、開口を前方へ向けた平面視略凹字状又は略Ｕ字状）の切込み１６ａを設けることで、該切込み１６ａの内側部分を弾性的に撓ませて凹ませるように構成される。操作部１６の表面は、軸筒１０外周面における当該操作部１６以外の部分と略面一となるように位置する。
切込み１６ａの後端部側は、図示した好ましい一例によれば、前述した被係止部１５に連通しているが、他例としては、切込み１６ａと被係止部１５を間隔を置いて別々に設けることも可能である。 The operating portion 16 is cut into the peripheral wall of the shaft tube 10 in a ring-like shape that penetrates the peripheral wall in the radial direction (according to the illustrated example, the opening is directed forward in a generally concave shape or a substantially U shape). By providing 16a, it is comprised so that the inner part of this notch 16a may be elastically bent and dented. The surface of the operation unit 16 is positioned so as to be substantially flush with a portion other than the operation unit 16 on the outer peripheral surface of the shaft tube 10.
The rear end side of the cut 16a communicates with the above-described locked portion 15 according to the illustrated preferred example. However, as another example, the cut 16a and the locked portion 15 are separated at intervals. It is also possible to provide it.

なお、図３及び図８中の符号１７は、前後方向へ連続する長穴状のガイド部である。このガイド部１７は、後述する中芯ユニット２０の被ガイド突起２１ｂ４（図８参照）と嵌り合って、中芯ユニット２０を前後方向へ所定量進退可能であって回転不能に保持する。
また、図３中の符号１７ａは、当該出没式筆記具の製造段階において、後述する被ガイド突起２１ｂ４（図８参照）をガイド部１７に嵌め合せる際に、周方向の位置決め等に用いられる切欠部である。 In addition, the code | symbol 17 in FIG.3 and FIG.8 is the elongate hole-shaped guide part which continues in the front-back direction. The guide portion 17 is fitted with a guided projection 21b4 (see FIG. 8) of the core unit 20 to be described later, and holds the core unit 20 forward and backward by a predetermined amount and cannot rotate.
Further, reference numeral 17a in FIG. 3 denotes a notch used for positioning in the circumferential direction or the like when a guided projection 21b4 (see FIG. 8), which will be described later, is fitted to the guide 17 in the manufacturing stage of the retractable writing instrument. It is.

また、図３及び図８中の符号１８は、後述するシール筒３０とベルト状部材５０の進退を案内するガイド凸部である。このガイド凸部１８は、軸筒１０の内周面から突出し軸筒軸方向へ伸びる二本のリブから形成され、これらリブ間の内面にガイド凹部１８ａを有する。
このガイド凸部１８の軸筒周方向の外面は、後述するベルト状部材５０の切欠部５１ａ（図４参照）に遊嵌してベルト状部材５０の進退を案内する。
また、ガイド凹部１８ａは、前記二本のリブとこれらリブ間の段部によって平面視凹状（図３（ａ）参照）に形成され、後述するシール筒３０の当接突起３３に嵌り合って、シール筒３０の前方への移動及び周方向の回動を規制する。 Further, reference numeral 18 in FIGS. 3 and 8 denotes a guide convex portion that guides advancement and retreat of a seal cylinder 30 and a belt-like member 50 described later. The guide protrusion 18 is formed of two ribs that protrude from the inner peripheral surface of the shaft tube 10 and extend in the shaft tube axis direction, and has a guide recess 18a on the inner surface between these ribs.
The outer surface of the guide protrusion 18 in the circumferential direction of the shaft cylinder is loosely fitted in a notch 51a (see FIG. 4) of the belt-like member 50 described later to guide the advancement and retraction of the belt-like member 50.
The guide recess 18a is formed in a concave shape in plan view (see FIG. 3A) by the two ribs and the step portion between the ribs, and fits into a contact protrusion 33 of the seal cylinder 30 described later, The forward movement and circumferential rotation of the seal cylinder 30 are restricted.

中芯ユニット２０は、図７に示すように、保持筒２１と、該保持筒２１の前部側に挿入されるチップ２２と、保持筒２１の後部側に挿入される中綿２３と、該中綿２３の後部側を覆うようにして保持筒２１に接続される尾栓２４と、保持筒２１の外周面に装着されて軸筒１０に係脱する係脱部材２５とから一体的に構成される。そして、この中芯ユニット２０は、チップ２２（筆記部）にインクを供給するインク供給構造として機能する。   As shown in FIG. 7, the core unit 20 includes a holding cylinder 21, a tip 22 inserted on the front side of the holding cylinder 21, a batting 23 inserted on the rear side of the holding cylinder 21, and the batting 23 is configured integrally with a tail plug 24 that is connected to the holding cylinder 21 so as to cover the rear side of the cover 23 and an engagement / disengagement member 25 that is attached to the outer peripheral surface of the holding cylinder 21 and engages / disengages with the shaft cylinder 10. . The core unit 20 functions as an ink supply structure that supplies ink to the chip 22 (writing unit).

保持筒２１は、図示例によれば、小径筒部２１ａと、該小径筒部２１ａの後側に接続された大径筒部２１ｂとからなる段付き筒状に形成される。   According to the illustrated example, the holding cylinder 21 is formed in a stepped cylinder shape including a small-diameter cylinder part 21a and a large-diameter cylinder part 21b connected to the rear side of the small-diameter cylinder part 21a.

小径筒部２１ａは、チップ２２の後部側を挿入可能な長尺円筒状に形成される。この小径筒部２１ａの前端側には、その前後部分よりも若干大径の円筒状突部２１ａ１が設けられる。この円筒状突部２１ａ１は、環状に装着されるシール筒３０の内面に摺接して該シール筒３０内の気密性を維持するとともにシール筒３０に相対し所定量進退するように保持される。
また、小径筒部２１ａの後端寄りには、後述するベルト状部材５０に嵌り合う複数（図示例によれば二つ）の係合突起２１ａ２，２１ａ２が設けられ、小径筒部２１ａと大径筒部２１ｂの間には段部２１ａ３が形成される。 The small diameter cylindrical portion 21a is formed in a long cylindrical shape into which the rear side of the chip 22 can be inserted. A cylindrical protrusion 21a1 having a slightly larger diameter than the front and rear portions is provided on the front end side of the small diameter cylindrical portion 21a. The cylindrical projection 21a1 is slidably brought into contact with the inner surface of the annular seal cylinder 30 to maintain airtightness in the seal cylinder 30 and is held so as to advance and retract by a predetermined amount relative to the seal cylinder 30.
Near the rear end of the small-diameter cylindrical portion 21a, a plurality of (two in the illustrated example) engagement protrusions 21a2 and 21a2 are provided to be fitted to a belt-like member 50 described later. A step portion 21a3 is formed between the tube portions 21b.

係合突起２１ａ２は、斜め後方を向くようにして径外方向へ突出する突起であり、図示例によれば、小径筒部２１ａの径方向の両側に略対称に二つ設けられる。   The engagement protrusions 21a2 are protrusions that protrude in the radially outward direction so as to face obliquely rearward. According to the illustrated example, two engagement protrusions 21a2 are provided approximately symmetrically on both sides in the radial direction of the small diameter cylindrical portion 21a.

段部２１ａ３は、後述するベルト状部材５０の後端側が乗越え可能となるように、後方斜め径外方向へ向く傾斜面状であって環状に形成される。   The stepped portion 21a3 is formed in an annular shape that is an inclined surface that faces the outer side of the rear oblique diameter so that a rear end side of a belt-like member 50, which will be described later, can be climbed over.

また、小径筒部２１ａの周囲には、図１に示すように、スプリング２６（付勢手段）が環状に装着される。このスプリング２６は、圧縮コイルバネであり、その後端側が、小径筒部２１ａにおける係合突起２１ａ２よりも前側のバネ受け部２１ａ４によって受けられる。バネ受け部２１ａ４は、スプリング２６の後端座部の内周面に嵌り合うとともに同後端座部を後方から受けるように形成され、図示例によれば、周方向に連続する断面階段状を呈する。   Further, as shown in FIG. 1, a spring 26 (biasing means) is annularly mounted around the small-diameter cylindrical portion 21a. The spring 26 is a compression coil spring, and the rear end side thereof is received by the spring receiving portion 21a4 on the front side of the engagement protrusion 21a2 in the small diameter cylindrical portion 21a. The spring receiving portion 21a4 is formed so as to be fitted to the inner peripheral surface of the rear end seat portion of the spring 26 and to receive the rear end seat portion from the rear. According to the illustrated example, the spring receiving portion 21a4 has a stepped cross section continuous in the circumferential direction. Present.

また、大径筒部２１ｂにおける軸方向の中央寄りには、後述する係脱部材２５が前後方向へ移動しないように嵌め合せられる環状凹部２１ｂ１と、同係脱部材２５が周方向へ回らないように係止される凸部２１ｂ２とが設けられる。
環状凹部２１ｂ１は、前後の環状リブ間に形成された環状の凹部であり、後述する係脱部材２５を前後移動不能に保持する。
凸部２１ｂ２は、係脱部材２５に対し凹凸状に嵌り合って、該係脱部材２５を回転不能に保持する。 Further, an annular recess 21b1 that is fitted so that the engagement / disengagement member 25 described later does not move in the front-rear direction and the engagement / disengagement member 25 are prevented from rotating in the circumferential direction near the center in the axial direction of the large-diameter cylindrical portion 21b. And a convex portion 21b2 to be engaged with the projection.
The annular recess 21b1 is an annular recess formed between the front and rear annular ribs, and holds the engagement / disengagement member 25, which will be described later, so that it cannot move back and forth.
The convex portion 21b2 fits in the concave-convex shape with respect to the engaging / disengaging member 25 and holds the engaging / disengaging member 25 in a non-rotatable manner.

また、図７中、大径筒部２１ｂ前端側の符号２１ｂ３は、筆記部２２ａの突出状態で、軸筒１０内で径内方向へ突出する被当接部１９に当接することで、中芯ユニット２０の前方への移動を規制する規制突起であり、径方向の両側に設けられる。
また、図８中、符号２１ｂ４は、軸筒１０周壁のガイド部１７に嵌り合うガイド突起であり、図示例によれば径方向の片側のみに設けられる。 Further, in FIG. 7, reference numeral 21 b 3 on the front end side of the large-diameter cylindrical portion 21 b is in a protruding state of the writing portion 22 a, and comes into contact with the contacted portion 19 that protrudes in the radial inward direction in the shaft cylinder 10. It is a restricting protrusion that restricts the forward movement of the unit 20, and is provided on both sides in the radial direction.
Further, in FIG. 8, reference numeral 21b4 is a guide projection that fits into the guide portion 17 of the peripheral wall of the shaft tube 10, and according to the illustrated example, it is provided only on one side in the radial direction.

また、図７及び図８中、符号２１ｂ５は、被ガイド突起２１ｂ４（図８参照）の突出方向に対し、略直交する後方に貫通する長孔状の貫通部であり、径方向の両側に設けられる。
この貫通部２１ｂ５は、当該出没式筆記具の製造段階において、保持筒２１を軸筒１０に挿入する際に、保持筒２１後端側の径内方向への弾性変形を容易にする。すなわち、保持筒２１を軸筒１０に挿入し組み付ける際、被ガイド突起２１ｂ４が、軸筒１０の後端縁を乗越えてガイド部１７に嵌り合う。この際、保持筒２１の後端側は、径内方向へ弾性変形するため、この弾性変形を、貫通部２１ｂ５が容易にする。
なお、前記弾性変形は、軸筒１０に保持筒２１が挿入された後に、保持筒２１の後端に尾栓２４が挿入され嵌り合うことで抑制される。 7 and 8, reference numeral 21b5 is a long hole-like through portion that penetrates rearward substantially perpendicular to the protruding direction of the guided projection 21b4 (see FIG. 8), and is provided on both sides in the radial direction. It is done.
The through-hole 21b5 facilitates elastic deformation in the radially inward direction on the rear end side of the holding cylinder 21 when the holding cylinder 21 is inserted into the shaft cylinder 10 in the manufacturing stage of the retractable writing instrument. That is, when the holding cylinder 21 is inserted into the shaft cylinder 10 and assembled, the guided projection 21 b 4 gets over the rear end edge of the shaft cylinder 10 and fits into the guide portion 17. At this time, since the rear end side of the holding cylinder 21 is elastically deformed in the radially inward direction, the through portion 21b5 facilitates this elastic deformation.
The elastic deformation is suppressed by inserting and fitting the tail plug 24 to the rear end of the holding cylinder 21 after the holding cylinder 21 is inserted into the shaft cylinder 10.

また、チップ２２は、多数の合成樹脂繊維を軸状に収束してなり、その前端部寄りに、後側の部分よりも一回り程太い筆記部２２ａを有する。該筆記部２２ａは、例えば砲弾状や斜めカット状等、当該出没式筆記具の用途に応じた適宜形状に形成され、チップ２２の後部側が保持筒２１に挿入された状態で、保持筒２１の前端部から前方へ突出する。   The chip 22 is formed by converging a large number of synthetic resin fibers in an axial shape, and has a writing portion 22a that is slightly thicker than the rear portion near the front end portion thereof. The writing portion 22a is formed in an appropriate shape according to the use of the retractable writing instrument, such as a bullet shape or an oblique cut shape, and the front end of the holding cylinder 21 is inserted in the holding cylinder 21 at the rear side of the tip 22. Projects forward from the section.

中綿２３は、円筒状の薄肉フィルム内に収容された多数の合成樹脂繊維にインクを含浸させてなり、保持筒２１の後端側に挿入される。保持筒２１内において、この中綿２３の前端側には、前記チップ２２の後端側が差し込まれる。したがって、中綿２３内の前記インクは、毛細管力によってチップ２２の前端側へ導かれることになる。   The batting 23 is formed by impregnating a large number of synthetic resin fibers accommodated in a cylindrical thin film with ink and inserted into the rear end side of the holding cylinder 21. In the holding cylinder 21, the rear end side of the tip 22 is inserted into the front end side of the batting 23. Therefore, the ink in the batting 23 is guided to the front end side of the chip 22 by capillary force.

尾栓２４は、有底筒状の部材であり、保持筒２１及び中綿２３等が軸筒１０に装着された後に、中綿２３の後端側を覆うようにして、保持筒２１の後端部に圧入接続される。図７中の符号２４ａは、保持筒２１内周面の突起（図示せず）に乗り越え嵌合されて抜止めとなる環状突起である。
この尾栓２４は、軸筒１０の後端から後方へ突出し、ノック操作部として機能する。
なお、中綿２３を内在する保持筒２１内の空間は、保持筒２１の後部側内周面に形成される環状突起２１ｂ６と、尾栓２４の先端側外周面２４ｂとの全周にわたる圧接により気密に保持される（図７参照）。 The tail plug 24 is a bottomed cylindrical member, and after the holding cylinder 21 and the batting 23 are mounted on the shaft cylinder 10, the rear end portion of the holding cylinder 21 is covered so as to cover the rear end side of the batting 23. Press-fit to Reference numeral 24a in FIG. 7 denotes an annular protrusion that is fitted over a protrusion (not shown) on the inner peripheral surface of the holding cylinder 21 to be prevented from being removed.
The tail plug 24 protrudes rearward from the rear end of the shaft tube 10 and functions as a knock operation portion.
Note that the space in the holding cylinder 21 containing the batting 23 is hermetically sealed by pressure contact over the entire circumference between the annular protrusion 21b6 formed on the rear inner peripheral surface of the holding cylinder 21 and the distal outer peripheral surface 24b of the tail plug 24. (See FIG. 7).

係脱部材２５は、弾性的に撓み可能な金属材料から形成され、保持筒２１外周に嵌め合せられる環状係止部２５ａと、該環状係止部２５ａから後方斜め径外方向へ突出するとともに径内方向へ弾性的に撓み可能な被押圧部２５ｂとから構成される（図７参照）。   The engagement / disengagement member 25 is formed of an elastically bendable metal material, and is fitted with an outer periphery of the holding cylinder 21. The engagement / disengagement member 25 protrudes from the annular engagement portion 25a to the rear diagonally outward and has a diameter. It is comprised from the to-be-pressed part 25b which can be elastically bent inward (refer FIG. 7).

環状係止部２５ａは、弾性的に拡径されて、保持筒２１の環状凹部２１ｂ１に嵌め合せられるように有端環状に形成される。そして、この環状係止部２５ａの周方向の両端側には、保持筒２１外周の凸部２１ｂ２に嵌り合って回り止めとなる係止孔２５ａ１が設けられる（図７参照）。   The annular locking portion 25a is elastically expanded in diameter and is formed in an end-like annular shape so as to be fitted into the annular recess 21b1 of the holding cylinder 21. At both ends in the circumferential direction of the annular locking portion 25a, locking holes 25a1 that are fitted to the convex portions 21b2 on the outer periphery of the holding cylinder 21 to prevent rotation are provided (see FIG. 7).

被押圧部２５ｂは、軸筒１０内を前進した際に軸筒１０の周壁における操作部１６以外の部分に係止されるとともに、この係止状態を操作部１６に押圧されて解除するように設けられている。
詳細に説明すれば、この被押圧部２５ｂは、軸筒１０周壁の被係止部１５に係脱可能な係止突起２５ｂ１と、係止突起２５ｂ１よりも前側で操作部１６に近接又は接触する被押圧面２５ｂ２と、係止突起２５ｂ１及び被押圧面２５ｂ２の周方向の両側に張り出す鍔部２５ｂ３とを有する（図７参照）。 The pressed portion 25b is locked to a portion other than the operation portion 16 on the peripheral wall of the shaft tube 10 when moving forward in the shaft tube 10, and the locked state is pressed by the operation portion 16 to be released. Is provided.
If it demonstrates in detail, this to-be-pressed part 25b will adjoin or contact the operation part 16 in the front side rather than the latching protrusion 25b1 and the latching protrusion 25b1 which can be engaged / disengaged with the to-be-latched part 15 of the shaft cylinder 10 peripheral wall. It has a pressed surface 25b2, and a hook 25b3 projecting on both sides of the locking projection 25b1 and the pressed surface 25b2 in the circumferential direction (see FIG. 7).

係止突起２５ｂ１は、例えば、係脱部材２５を構成する平板状原材を、プレス加工等により断面略三角形状に曲げ形成され、軸筒１０の被係止部１５に係止された状態で、軸筒１０の外周面よりも径外方向へ突出しない高さを有する。   For example, the locking projection 25b1 is formed by bending a flat plate material constituting the engaging / disengaging member 25 into a substantially triangular cross section by pressing or the like, and being locked to the locked portion 15 of the shaft tube 10. The height is such that it does not protrude radially outward from the outer peripheral surface of the shaft tube 10.

被押圧面２５ｂ２は、図１０（ｆ）に示すように、係止突起２５ｂ１が被係止部１５に係止された状態で、操作部１６の裏側に近接又は接触するように配置されている。   As shown in FIG. 10 (f), the pressed surface 25 b 2 is arranged so as to be close to or in contact with the back side of the operation unit 16 in a state where the locking projection 25 b 1 is locked to the locked portion 15. .

鍔部２５ｂ３は、軸筒１０の内周面に当接することで、係止突起２５ｂ１が軸筒１０の外周面から径外方向へ突出しないようにしている。したがって、この鍔部２５ｂ３の外面から係止突起２５ｂ１突端までの寸法は、軸筒１０周壁の肉厚よりも小さく設定される。   The flange portion 25b3 abuts against the inner peripheral surface of the shaft tube 10 so that the locking projection 25b1 does not protrude radially outward from the outer peripheral surface of the shaft tube 10. Accordingly, the dimension from the outer surface of the flange 25b3 to the protruding end of the locking projection 25b1 is set smaller than the thickness of the peripheral wall of the shaft tube 10.

また、シール筒３０は、筆記部２２ａを突出した保持筒２１の前端側の周囲を覆う略円筒状の部材であり、保持筒２１に対し環状に装着される。
このシール筒３０の後端側内周面には、保持筒２１の前端側外周面（詳細には図７に示す円筒状突部２１ａ１）に摺接して、該シール筒３０から保持筒２１にわたる内部の気密性を保持する環状突起３１が設けられる（図５参照）。
シール筒３０の後端側外周面には、保持筒２１を後方へ付勢するスプリング２６（図１参照）の前端を受ける段部３２が設けられる。
また、シール筒３０の前端側外周面における径方向の両側には、当接突起３３（図１及び図５等参照）が設けられる。この当接突起３３は、軸筒１０内のガイド凹部１８ａに当接して、シール筒３０の前方への移動を規制する。
また、シール筒３０の前端側外周面には、蓋部材４０を装着するための嵌合突起３４が設けられる。 The seal cylinder 30 is a substantially cylindrical member that covers the periphery of the front end side of the holding cylinder 21 that protrudes from the writing portion 22 a, and is attached to the holding cylinder 21 in an annular shape.
The rear end side inner peripheral surface of the seal tube 30 is in sliding contact with the front end side outer peripheral surface of the holding tube 21 (specifically, the cylindrical protrusion 21a1 shown in FIG. 7), and extends from the seal tube 30 to the holding tube 21. An annular protrusion 31 is provided to maintain the internal airtightness (see FIG. 5).
A stepped portion 32 that receives the front end of a spring 26 (see FIG. 1) that biases the holding cylinder 21 rearward is provided on the outer peripheral surface of the seal cylinder 30 on the rear end side.
In addition, contact protrusions 33 (see FIGS. 1 and 5, etc.) are provided on both sides in the radial direction on the front end side outer peripheral surface of the seal cylinder 30. The abutment protrusion 33 abuts on the guide recess 18 a in the shaft tube 10 and restricts the forward movement of the seal tube 30.
A fitting projection 34 for mounting the lid member 40 is provided on the outer peripheral surface of the front end side of the seal cylinder 30.

蓋部材４０は、前記嵌合突起３４に嵌合される嵌合片部４１と、該嵌合片部に対し交差状に成形された蓋本体部４２と、嵌合片部４１と蓋本体部４２を接続する接続部４３（付勢手段）とを具備し、接続部４３を弾性的に撓ませて蓋本体部４２を回動させる。この蓋部材４０は、弾性的に撓むことが可能な合成樹脂材料（例えば、ポリプロピレン等）によって一体成形される。   The lid member 40 includes a fitting piece portion 41 fitted to the fitting protrusion 34, a lid main body portion 42 formed in a cross shape with respect to the fitting piece portion, the fitting piece portion 41 and the lid main body portion. And connecting part 43 (biasing means) for connecting 42, and flexing the connecting part 43 to rotate the lid main body part 42. The lid member 40 is integrally formed of a synthetic resin material (for example, polypropylene or the like) that can be elastically bent.

蓋本体部４２は、シール筒３０の前端開口部の内縁に嵌脱可能な円盤状に形成される。
この蓋本体部４２の内面（図５によれば左端面）には、中心寄りに位置する***部４２ａと、該***部４２ａの周囲に位置する突起４２ｂとが設けられる。
***部４２ａは、蓋部材４０の閉鎖状態で、シール筒３０内に突出する凸曲面状に形成される。この***部４２ａは、万が一、蓋本体部４２がシール筒３０に食い込んで開放し難くなった場合等に、前進する筆記部２２ａを受けて蓋本体部４２の開放を容易にする。
突起４２ｂは、周方向に間隔を置いて複数設けられ、蓋部材４０の閉鎖状態においてシール筒３０前端側内縁に近接又は接触して蓋部材４０をセンタリングし、閉鎖状態の蓋部材４０が、搬送や使用時の振動等によって径方向へがたつき、シール性が損なわれてしまうようなことを防ぐ。 The lid main body 42 is formed in a disc shape that can be fitted and removed on the inner edge of the front end opening of the seal cylinder 30.
On the inner surface (the left end surface according to FIG. 5) of the lid main body portion 42, a raised portion 42a located near the center and a protrusion 42b located around the raised portion 42a are provided.
The raised portion 42 a is formed in a convex curved shape that protrudes into the seal cylinder 30 when the lid member 40 is closed. In the unlikely event that the lid main body 42 bites into the seal tube 30 and becomes difficult to open, the raised portion 42a receives the writing portion 22a that advances, and facilitates the opening of the lid main body 42.
A plurality of protrusions 42b are provided at intervals in the circumferential direction, and in the closed state of the lid member 40, the lid member 40 is centered by being close to or in contact with the inner edge of the front end side of the seal cylinder 30, and the closed lid member 40 is transported. Prevents the seal from being damaged due to shakiness in the radial direction due to vibration during use.

接続部４３（付勢手段）は、蓋本体部４２を略全開状態にて嵌合片部４１に接続する略Ｌ字状に形成され、弾性的に撓むことでシール筒３０の前端開口部を閉鎖し、逆方向への復元により同前端開口部を開放する。
この接続部４３は、蓋本体部４２をシール筒３０に対し回動可能に支持するとともに開放方向へ付勢する構造であればよく、他例としては、蓋本体部４２とシール筒３０との間に、蓋本体部４２をシール筒３０に対し回動させる軸部と、蓋本体部４２を開放方向へ付勢する付勢手段（例えば、捩じりバネや板バネ等）を設けた態様とすることも可能である。 The connecting portion 43 (biasing means) is formed in a substantially L shape that connects the lid main body portion 42 to the fitting piece portion 41 in a substantially fully opened state, and is elastically bent to open the front end opening of the seal cylinder 30. And the front end opening is opened by restoring in the opposite direction.
The connecting portion 43 only needs to have a structure that supports the lid main body portion 42 so as to be rotatable with respect to the seal cylinder 30 and urges the lid main body portion 42 in the opening direction. A mode in which a shaft portion for rotating the lid main body portion 42 with respect to the seal cylinder 30 and a biasing means (for example, a torsion spring or a leaf spring) for biasing the lid main body portion 42 in the opening direction are provided. It is also possible.

また、蓋部材の外面（図５によれば右端面）には、後述するベルト状部材５０に対し径方向へ係脱可能な係脱片４２ｃと、径外方向へ撓んだ際のベルト状部材５０に対しその径外方向側に位置する規制突部４２ｄとが具備される。
係脱片４２ｃは、図６（ｂ）に示すように、径方向の両端側に凹部４２ｃ１，４２ｃ１を有する突片状に形成され、蓋本体部４２の中央よりに配置される。凹部４２ｃ１，４２ｃ１には、後述するベルト状部材５０が係脱される。
規制突部４２ｄは、蓋本体部４２の径方向の端部側から、径方向に突出して前方へも突出する略Ｌ字状の突起であり（図６（ｂ）参照）、蓋部材４０がベルト部５２を超えて開放方向へ回動するのを阻む。この規制突部４２ｄは、径方向の両側に対称に位置するように二つ設けられる。 Further, on the outer surface of the lid member (the right end surface according to FIG. 5), an engagement / disengagement piece 42c that can be engaged / disengaged in the radial direction with respect to the belt-shaped member 50 described later, and a belt shape when bent in the radial direction A regulating protrusion 42d located on the radially outward side of the member 50 is provided.
As shown in FIG. 6B, the engaging / disengaging piece 42 c is formed in a protruding piece shape having concave portions 42 c 1 and 42 c 1 on both ends in the radial direction, and is disposed from the center of the lid main body 42. A belt-like member 50 described later is engaged with and disengaged from the recesses 42c1 and 42c1.
The restricting protrusion 42d is a substantially L-shaped protrusion that protrudes in the radial direction from the radial end portion side of the lid main body 42 (see FIG. 6B). This prevents the belt portion 52 from rotating in the opening direction. Two of the restricting protrusions 42d are provided so as to be symmetrically located on both sides in the radial direction.

また、ベルト状部材５０は、図４に示すように、中芯ユニット２０の前端側に環状に遊挿される筒部５１と、該筒部５１の前端から突出する二つのベルト部５２，５２と、筒部５１の後端から後方へ突出して中芯ユニット２０に係止される二つの係止片部５３，５３とを具備し、弾性的に撓むことが可能な合成樹脂材料（例えば、ポリプロピレン等）によって一体成形されている。   Further, as shown in FIG. 4, the belt-shaped member 50 includes a cylindrical portion 51 that is annularly inserted into the front end side of the core unit 20 and two belt portions 52 and 52 that protrude from the front end of the cylindrical portion 51. , A synthetic resin material that includes two locking pieces 53 and 53 that protrude rearward from the rear end of the cylindrical portion 51 and are locked to the core unit 20 and can be elastically bent (for example, Are integrally formed of polypropylene or the like.

筒部５１は、保持筒２１の前端側（詳細には小径筒部２１ａ）及びスプリング２６を遊挿可能な略円筒状の部材であり、その周壁に、切欠部５１ａを有する。この切欠部５１ａは、径方向の両側に対称に設けられ、軸筒１０内面のガイド凸部１８（図３及び図８（ａ）等参照）に遊嵌して、ベルト状部材５０が周方向へ回転することなく前後方向へスムーズに進退するようにガイドする。   The cylinder part 51 is a substantially cylindrical member into which the front end side (specifically, the small diameter cylinder part 21a) of the holding cylinder 21 and the spring 26 can be loosely inserted, and has a notch part 51a on the peripheral wall thereof. The notches 51a are provided symmetrically on both sides in the radial direction, loosely fitted on the guide protrusions 18 (see FIG. 3 and FIG. 8 (a), etc.) on the inner surface of the shaft tube 10, and the belt-like member 50 is in the circumferential direction. Guide to smoothly advance and retreat back and forth without rotating to

二つのベルト部５２，５２は、軸筒中心部の両側に位置するように間隔を置いて略平行に設けられる。
各ベルト部５２は、長手方向の中央寄り部分を閉鎖状態の蓋部材４０（詳細には蓋本体部４２）に対し前方側から接触させるとともに、両端側部分をシール筒３０外周面に沿って軸筒後方へ延設した略Ｕ字状に形成され、その後端部は筒部５１に接続されている。
このベルト部５２は、径方向へ弾性的に撓むことが可能であり、外力を受けない状態では、図４に示すように、軸心に対し略平行な初期位置となり、中芯ユニット２０と共に前進した際には、軸筒１０内の傾斜状ガイド部１２に摺接されて径外方向へ撓み、後退した際には径内方向へ復元する。
このベルト部５２の前端部は、全閉状態の蓋部材４０の前面に接触した初期位置において（図１及び図８（ａ）参照）、蓋部材４０における係脱片４２ｃの凹部４２ｃ１（図６（ｂ）参照）に対し、径外方向側から凹凸状に嵌り合う。 The two belt portions 52, 52 are provided substantially in parallel with an interval so as to be positioned on both sides of the central portion of the shaft cylinder.
Each belt portion 52 has a central portion in the longitudinal direction in contact with the closed lid member 40 (specifically, the lid main body portion 42) from the front side, and both end portions are pivoted along the outer peripheral surface of the seal cylinder 30. It is formed in a substantially U shape extending to the rear of the cylinder, and its rear end is connected to the cylinder 51.
The belt portion 52 can be elastically bent in the radial direction, and is in an initial position substantially parallel to the axis as shown in FIG. When it moves forward, it slides into contact with the inclined guide portion 12 in the shaft tube 10 and bends radially outward, and when it moves backward, it restores radially inward.
The front end of the belt 52 is in the initial position in contact with the front surface of the fully-closed lid member 40 (see FIGS. 1 and 8A), and the recess 42c1 of the engagement / disengagement piece 42c in the lid member 40 (FIG. 6). (See (b)), it fits in an irregular shape from the radially outward side.

係止片部５３，５３は、軸筒中心部の両側に位置するように間隔を置いて設けられる（図４参照）。
各係止片部５３には、保持筒２１の係合突起２１ａ２に対し前後スライド可能に嵌り合う長孔状のスライド係合孔５３ａが設けられる。 The locking pieces 53 are provided at intervals so as to be located on both sides of the central part of the shaft cylinder (see FIG. 4).
Each locking piece 53 is provided with a long-sliding slide engaging hole 53a that fits to the engaging projection 21a2 of the holding cylinder 21 so as to be slidable back and forth.

また、係脱機構６０は、上述した係脱部材２５や、軸筒１０周壁のガイド部１４、被係止部１５、操作部１６等によって構成される機構であり、中芯ユニット２０が前進した際に、被押圧部２５ｂの係止突起２５ｂ１を、軸筒１０側の被係止部１５に係止させ、この係止状態を、操作部１６に対する押圧操作によって解除する。   Further, the engagement / disengagement mechanism 60 is a mechanism configured by the engagement / disengagement member 25 described above, the guide portion 14 of the peripheral wall of the shaft tube 10, the locked portion 15, the operation portion 16, and the like, and the core unit 20 has advanced. At this time, the locking protrusion 25b1 of the pressed portion 25b is locked to the locked portion 15 on the shaft tube 10 side, and this locked state is released by a pressing operation on the operation portion 16.

次に、上記構成の出没式筆記具について、その特徴的な作用効果を詳細に説明する。
先ず、筆記部２２ａを没入させた初期位置では、図８（ａ）に示すように、中芯ユニット２０が、被ガイド突起２１ｂ４をガイド部１７の後端縁に当接又は近接させるように位置する。そして、この状態において、シール筒３０は、スプリング２６によって前方へ付勢され、当接突起３３を軸筒１０内周面のガイド凹部１８ａに当接させる。また、ベルト状部材５０は、その前端側の各ベルト部５２を、閉鎖状態の蓋部材４０の前面に当接させて係脱片４２ｃに係止している。 Next, the characteristic operation and effect of the above-described retractable writing instrument will be described in detail.
First, in the initial position where the writing portion 22a is immersed, the center unit 20 is positioned so that the guided projection 21b4 is in contact with or close to the rear end edge of the guide portion 17 as shown in FIG. To do. In this state, the seal cylinder 30 is urged forward by the spring 26 to bring the contact protrusion 33 into contact with the guide recess 18 a on the inner peripheral surface of the shaft cylinder 10. Further, the belt-like member 50 is engaged with the engagement / disengagement piece 42c by bringing each belt portion 52 on the front end side into contact with the front surface of the lid member 40 in the closed state.

また、前記初期状態において、ベルト状部材５０後端側の係止片部５３は、スライド係合孔５３ａを傾斜状の係合突起２１ａ２に係合させることで、図８（ａ）等に示すように、径内方向側へ撓んで段部２１ａ３に近接している。すなわち、ベルト状部材５０と保持筒２１との間には、スプリング２６による弾発力が作用するため、この弾発力により、係止片部５３が、係合突起２１ａ２の後端傾斜面に押圧されて軸筒中心側へ撓み、該係止片部５３の後端が段部２１ａ３に近接する。なお、他例としては、前記初期状態において、係止片部５３の後端を段部２１ａ３に接触させることも可能である。   In the initial state, the engagement piece 53 on the rear end side of the belt-like member 50 is shown in FIG. 8A and the like by engaging the slide engagement hole 53a with the inclined engagement protrusion 21a2. Thus, it is bent in the radially inward direction and is close to the stepped portion 21a3. That is, since the elastic force by the spring 26 acts between the belt-like member 50 and the holding cylinder 21, the elastic piece 53 causes the locking piece portion 53 to be on the rear end inclined surface of the engaging protrusion 21a2. When pressed, it bends toward the center of the shaft cylinder, and the rear end of the locking piece 53 comes close to the stepped portion 21a3. As another example, in the initial state, the rear end of the locking piece portion 53 can be brought into contact with the stepped portion 21a3.

次に、図８（ｂ）に示すように、尾栓２４に対するノック操作により、中芯ユニット２０に前方への押圧力が加わると、中芯ユニット２０は、スプリング２６を圧縮させながら、シール筒３０との間隔を狭めるようにして前進する。この前進の際、中芯ユニット２０の段部２１ａ３がベルト状部材５０の後端（詳細には係止片部５３後端）に当接して、ベルト状部材５０が一体的に前進する。また、この前進は、係止突起２５ｂ１とガイド部１４との嵌り合いや、被ガイド突起２１ｂ４とガイド部１７との嵌り合い等によってガイドされる。
そして、この前進に伴い、ベルト状部材５０の前端のベルト部５２も前進するため、蓋部材４０が徐々に開放してゆく。この際の蓋部材４０の開放は、基本的には接続部４３（図５参照）の復元力によるが、仮に蓋部材４０がシール筒３０内に食い込んで開き難い場合であっても、凹部４２ｃ１（図６参照）とベルト部５２とが係合し、蓋部材４０前面の係脱片４２ｃがベルト部５２により前方へ引っ張られるため、スムーズに行われる。 Next, as shown in FIG. 8B, when a forward pressing force is applied to the core unit 20 by a knocking operation on the tail plug 24, the core unit 20 compresses the spring 26 while compressing the spring 26. Move forward to narrow the distance from 30. During this advancement, the stepped portion 21a3 of the core unit 20 contacts the rear end of the belt-like member 50 (specifically, the rear end of the locking piece 53), and the belt-like member 50 advances integrally. Further, this advancement is guided by the fitting between the locking projection 25b1 and the guide portion 14, the fitting between the guided projection 21b4 and the guide portion 17, or the like.
With this advance, the belt portion 52 at the front end of the belt-like member 50 also advances, so that the lid member 40 gradually opens. The opening of the lid member 40 at this time is basically due to the restoring force of the connecting portion 43 (see FIG. 5), but even if the lid member 40 bites into the seal cylinder 30 and is difficult to open, the recess 42c1. Since the belt portion 52 is engaged with the belt portion 52 (see FIG. 6) and the engagement / disengagement piece 42c on the front surface of the lid member 40 is pulled forward by the belt portion 52, the operation is smoothly performed.

図９（ｃ）に示すように、中芯ユニット２０が更に前進すると、ベルト状部材５０前端のベルト部５２が、軸筒１０内面の傾斜状ガイド部１２に当接する。そして、中芯ユニット２０が前進すると、ベルト部５２は傾斜状ガイド部１２に沿って径外方向へ撓んで係脱片４２ｃから外れる。そして、蓋部材４０は、開放方向の復元力により、前記ベルト部５２の撓みに伴って、徐々に開放してゆく。
なお、図９〜図１０では、蓋部材４０を明確に示すために、一方のベルト部５２を省略している。 As shown in FIG. 9C, when the core unit 20 further advances, the belt portion 52 at the front end of the belt-like member 50 contacts the inclined guide portion 12 on the inner surface of the shaft tube 10. When the core unit 20 moves forward, the belt portion 52 bends radially outward along the inclined guide portion 12 and is detached from the engagement / disengagement piece 42c. Then, the lid member 40 gradually opens as the belt portion 52 is bent by the restoring force in the opening direction.
9 to 10, one belt portion 52 is omitted in order to clearly show the lid member 40.

次に、ベルト状部材５０がベルト部５２を被当接部１３に当接させて前進不能になるとともに、蓋部材４０が弾性的な復元力により略全開すると（図１０（ｅ）参照）、ベルト状部材５０後端の係止片部５３が、段部２１ａ３の傾斜面に沿って拡径し、該段部２１ａ３を後方へ乗り越えるようにして、中芯ユニット２０のみが軸筒１０に相対し前進し、筆記部２２ａが、シール筒３０前端の開口部から前方へ突出する。
なお、蓋部材４０の全開状態では、図１０（ｅ）に示すように、該蓋部材４０両側のＬ字状の規制突部４２ｄが、ベルト部５２の内面に当接するため、該蓋部材４０がベルト部５２よりも径外方向へ回り込んで閉鎖不能になるようなことを防ぐことができる。 Next, the belt-like member 50 makes the belt portion 52 contact the contacted portion 13 and cannot advance, and the lid member 40 is substantially fully opened by an elastic restoring force (see FIG. 10E). The locking piece 53 at the rear end of the belt-shaped member 50 expands in diameter along the inclined surface of the stepped portion 21a3 so as to ride over the stepped portion 21a3 so that only the core unit 20 is relative to the shaft tube 10. The writing portion 22a protrudes forward from the opening at the front end of the seal cylinder 30.
In the fully open state of the lid member 40, as shown in FIG. 10E, the L-shaped restricting protrusions 42d on both sides of the lid member 40 abut against the inner surface of the belt portion 52. It is possible to prevent the belt portion 52 from turning around in the radially outward direction from becoming impossible to close.

そして、図１０（ｆ）に示すように、更に中芯ユニット２０が前進すると、該中芯ユニット２０は、前進不能状態のベルト状部材５０における両係止片部５３，５３間に入り込むようにして前進し、筆記部２２ａを軸筒１０前端から突出させる。
この突出状態は、係脱機構６０を構成する被押圧部２５ｂの係止突起２５ｂ１が、軸筒１０側の被係止部１５に係止されることで維持される。 Then, as shown in FIG. 10 (f), when the core unit 20 further advances, the core unit 20 enters between the two locking pieces 53 and 53 of the belt-like member 50 in a state where the advancement is impossible. The writing portion 22a is projected from the front end of the shaft tube 10.
This protruding state is maintained by the locking projection 25b1 of the pressed portion 25b constituting the engagement / disengagement mechanism 60 being locked to the locked portion 15 on the shaft tube 10 side.

前記突出状態から、筆記部２２ａを没入させる際には、軸筒１０周壁の操作部１６を径内方向へ押圧して撓ませればよい。つまり、操作部１６が径内方向へ撓むと、該操作部１６が被押圧部２５ｂに当接して該被押圧部２５ｂを径内方向へ押圧し撓ませる。したがって、被押圧部２５ｂの係止突起２５ｂ１が被係止部１５から外れて、スプリング２６の弾発力により、中芯ユニット２０の後退が始まる。この後退は、上記説明と逆の動作により行われる。   In order to immerse the writing portion 22a from the protruding state, the operation portion 16 on the peripheral wall of the shaft tube 10 may be pressed and bent in the radially inward direction. That is, when the operation part 16 bends in the radial direction, the operation part 16 comes into contact with the pressed part 25b and presses and bends the pressed part 25b in the radial direction. Therefore, the locking protrusion 25b1 of the pressed portion 25b is detached from the locked portion 15, and the retraction of the core unit 20 is started by the elastic force of the spring 26. This backward movement is performed by an operation reverse to the above description.

すなわち、係脱部材２５が軸筒１０から外れると、先ず、中芯ユニット２０（詳細には、保持筒２１、チップ２２、中綿２３、尾栓２４及び係脱部材２５）のみが、スプリング２６の弾発力により、両係止片部５３，５３の間を後方へスライドし（図１０（ｆ）（ｅ）参照）、筆記部２２ａが軸筒１０内へ没入してゆく。   That is, when the engagement / disengagement member 25 is detached from the shaft cylinder 10, first, only the core unit 20 (specifically, the holding cylinder 21, the tip 22, the batting 23, the tail plug 24, and the engagement / disengagement member 25) Due to the elastic force, it slides backward between the locking pieces 53 and 53 (see FIGS. 10 (f) and 10 (e)), and the writing portion 22 a is immersed in the shaft tube 10.

そして、中芯ユニット２０の後退が進み、図１０（ｅ）に示すように、係止片部５３が段部２１ａ３よりも前側で係合突起２１ａ２に掛けられた状態に位置すると、その後は、図９（ｄ）に示すように、ベルト状部材５０も係合突起２１ａ２に引っ張られて一体的に後退する。このベルト状部材５０の後退は、図１０（ｅ）に示すように、筆記部２２ａがシール筒３０内に没入しかけた位置から開始する。   Then, when the retreat of the core unit 20 proceeds, as shown in FIG. 10 (e), when the locking piece 53 is positioned in a state of being hooked on the engaging protrusion 21 a 2 on the front side of the stepped portion 21 a 3, thereafter, As shown in FIG. 9 (d), the belt-like member 50 is also pulled backward by the engagement protrusion 21a2. The backward movement of the belt-like member 50 starts from a position where the writing part 22a is almost immersed in the seal cylinder 30 as shown in FIG.

この後のベルト状部材５０の後退中は、図９（ｄ）〜（ｃ）に示すように、ベルト部５２が、傾斜状ガイド部１２に沿って軸筒中心方向へ復元しながら蓋部材４０の前面を後方へ押して、蓋部材４０を閉鎖させてゆく。   During the subsequent retraction of the belt-shaped member 50, as shown in FIGS. 9D to 9C, the belt portion 52 is restored along the inclined guide portion 12 toward the center of the shaft cylinder 40 while being covered. The front surface of the cover member 40 is pushed rearward to close the lid member 40.

さらに、中芯ユニット２０及びベルト状部材５０が後退すると、図８（ｂ）に示すように、ベルト部５２前端が傾斜状ガイド部１２から離れ、二つのベルト部５２，５２が略平行になって係脱片４２ｃ両側に係止され、蓋部材４０を後方へ押圧する。   Further, when the core unit 20 and the belt-like member 50 are retracted, as shown in FIG. 8B, the front end of the belt portion 52 is separated from the inclined guide portion 12, and the two belt portions 52, 52 become substantially parallel. Thus, the cover member 40 is locked to both sides of the engagement / disengagement piece 42c and presses the lid member 40 backward.

そして、前記後退の後、図８（ａ）に示すように、筆記部２２ａがシール筒３０内に完全に没入し、蓋部材４０が全閉し、該蓋部材４０の前面にベルト部５２が掛けられ、被押圧部２５ｂがガイド部１４内の後端寄りに位置し、初期状態となる。   After the retreat, as shown in FIG. 8A, the writing portion 22a is completely immersed in the seal cylinder 30, the lid member 40 is fully closed, and the belt portion 52 is disposed on the front surface of the lid member 40. The pressed part 25b is positioned near the rear end in the guide part 14 and is in an initial state.

よって、上記実施例によれば、閉鎖状態の蓋部材４０をベルト状部材５０によって付勢し、シール筒３０内の密閉性を向上でき、その上、蓋部材４０に対するベルト状部材５０の係脱、蓋部材４０の開閉回動、筆記部２２ａの進退等を、好適なタイミングでスムーズに行うことができる。   Therefore, according to the above embodiment, the lid member 40 in the closed state can be urged by the belt-like member 50 to improve the sealing performance in the seal cylinder 30, and in addition, the belt-like member 50 can be engaged with and disengaged from the lid member 40. The lid member 40 can be smoothly opened and closed, and the writing portion 22a can be smoothly advanced and retracted at a suitable timing.

しかも、筆記部２２ａの突出状態では、軸筒１０の周壁を押圧する操作により筆記部２２ａを容易に没入させることができる上、操作部１６や被押圧部２５ｂ等が軸筒１０の周壁よりも径外方向へ突出しない構造であるため、操作部１６や被押圧部２５ｂ等に対し机や手、指等の物が当接して、意図せずに筆記部２２ａが没入してしまうような誤操作を防ぐことができる。   Moreover, in the protruding state of the writing portion 22a, the writing portion 22a can be easily immersed by an operation of pressing the peripheral wall of the shaft tube 10, and the operation portion 16, the pressed portion 25b, etc. are more than the peripheral wall of the shaft tube 10. Since it has a structure that does not protrude outwardly, an erroneous operation such that the writing unit 22a is unintentionally brought into contact with an object such as a desk, hand, or finger against the operation unit 16, the pressed portion 25b, etc. Can be prevented.

よって、筆記部収納時のシール性、出没時の動作性及び操作性の良好な出没式筆記具を提供することができる。   Accordingly, it is possible to provide a retractable writing instrument that has good sealing performance when stored in the writing section, operability when retracted, and operability.

なお、上記実施例によれば、シール筒３０に対し別部材の蓋部材４０を組付けたが、これらシール筒３０と蓋部材４０を一体の部材とすることも可能である。   In addition, according to the said Example, although the cover member 40 of another member was assembled | attached with respect to the seal cylinder 30, these seal cylinders 30 and the cover member 40 can also be made into an integral member.

また、上記実施例によれば、ベルト状部材５０の前端側に二つのベルト部５２，５２を有するようにしたが、他例としては、ベルト部５２を単数にした態様や、ベルト部５２を周方向に三つ以上設けた態様とすることも可能である。   Moreover, according to the said Example, although it was made to have the two belt parts 52 and 52 in the front-end side of the belt-shaped member 50, as an other example, the aspect which made the belt part 52 single, or the belt part 52 is provided. It is also possible to adopt a mode in which three or more are provided in the circumferential direction.

また、上記実施例によれば、ベルト部５２が傾斜状ガイド部１２の一側面に摺接して撓む態様としたが、他例としては、ベルト部５２が傾斜状ガイド部１２に対し凹凸状に嵌り合って前進しながら撓む態様等とすることも可能である。   Moreover, according to the said Example, although the belt part 52 was made into the aspect which slidably contacts to the one side surface of the inclined guide part 12, and as an example, the belt part 52 is uneven | corrugated with respect to the inclined guide part 12. It is also possible to adopt a mode of being bent while being forwardly fitted.

また、上記実施例では、被係止部１５を軸筒１０周壁を貫通するように形成したが、この被係止部１５は、係止突起２５ｂ１と係脱可能な構成であればよく、この被係止部１５の他例としては、軸筒１０の内周面に設けた凹部等とすることも可能である。
同様に、ガイド部１４，１７も、軸筒１０の内周面に設けた溝等とすることが可能である。 Moreover, in the said Example, although the to-be-latched part 15 was formed so that the shaft cylinder 10 surrounding wall might be penetrated, this to-be-latched part 15 should just be the structure which can be engaged / disengaged with the latching protrusion 25b1, As another example of the locked portion 15, a recess provided on the inner peripheral surface of the shaft tube 10 can be used.
Similarly, the guide portions 14 and 17 can be grooves provided on the inner peripheral surface of the shaft tube 10.

また、上記実施例では、軸筒１０周壁の切込み１６ａの内側部分を弾性的に凹むことが可能な操作部１６としたが、他例としては、軸筒１０の周壁の一部を弾性体（例えばエラストマー樹脂）等により構成し、この弾性体を弾性的に凹むことが可能な操作部とすることも可能である。   Moreover, in the said Example, although it was set as the operation part 16 in which the inner part of the notch | incision 16a of the axial cylinder 10 surrounding wall was dented elastically, as another example, a part of peripheral wall of the axial cylinder 10 was made into an elastic body ( For example, it is possible to use an operation unit that is made of an elastomer resin) and that can elastically dent the elastic body.

また、上記実施例では、操作部１６の表面を、軸筒１０外周面における操作部１６以外の部分と略面一に配置したが、他例としては、操作部１６の表面を、軸筒１０外周面における操作部１６以外の部分よりも凹ませた態様とすることも可能である。   Moreover, in the said Example, although the surface of the operation part 16 was arrange | positioned substantially flush with parts other than the operation part 16 in the axial cylinder 10 outer peripheral surface, as another example, the surface of the operation part 16 is made into the axial cylinder 10. It is also possible to adopt a mode in which the outer peripheral surface is recessed from a portion other than the operation portion 16.

また、上記実施例では、操作部１６及び被押圧部２５ｂを、軸筒１０の周壁に一箇所だけ設けたが、他例としては、これら操作部１６及び被押圧部２５ｂを、軸筒１０周壁の周方向及び／又は軸方向に複数設けて、より操作性を向上することも可能である。   Moreover, in the said Example, although the operation part 16 and the to-be-pressed part 25b were provided in one place in the surrounding wall of the axial cylinder 10, as another example, these operating part 16 and the to-be-pressed part 25b are provided in the axial cylinder 10 surrounding wall. It is also possible to improve the operability by providing a plurality in the circumferential direction and / or the axial direction.

１０：軸筒 １２：傾斜状ガイド部
１３：被当接部 １４，１７：ガイド部
１５：被係止部 １６：操作部
１６ａ：切込み ２０：中芯ユニット
２１：保持筒 ２１ａ２：係合突起
２１ａ３：段部 ２２：チップ
２２ａ：筆記部 ２３：中綿
２４：尾栓 ２５：係脱部材
２６：スプリング（付勢手段） ２５ａ：環状係止部
２５ｂ：被押圧部 ３０：シール筒
４０：蓋部材 ４２ｂ：突起
４２ｃ：係脱片 ４２ｄ：規制突部
４３：接続部（付勢手段） ４０：蓋部材
５０：ベルト状部材 ５２：ベルト部
５３：係止片部 ６０：係脱機構 DESCRIPTION OF SYMBOLS 10: Shaft cylinder 12: Inclined guide part 13: Contact part 14, 17: Guide part 15: Locked part 16: Operation part 16a: Cutting 20: Center unit 21: Holding cylinder 21a2: Engagement protrusion 21a3 : Step part 22: Tip 22a: Writing part 23: Filling 24: Tail plug 25: Tail plug 25: Engaging / disengaging member 26: Spring (biasing means) 25a: Annular locking part 25b: Pressed part 30: Seal cylinder 40: Lid member 42b : Projection 42c: Engaging / disconnecting piece 42d: Restricting projection 43: Connection portion (biasing means) 40: Lid member 50: Belt-like member 52: Belt portion
53: Locking piece 60: Engaging / disengaging mechanism

Claims (5)

軸筒には中芯ユニットが前後動可能に収容され、
前記中芯ユニットの先端には筆記部が設けられ、
前記中芯ユニットには前記筆記部にインクを供給するインク供給構造が設けられ、
前記筆記部の周囲はシール筒及び蓋部材により閉塞され、
前記蓋部材は前記筆記部の前方で回動して前記シール筒の前端開口部を開閉するように設けられ、
前記蓋部材の前端にはベルト部が係脱可能に係合され、
前記シール筒と前記中芯ユニットは、付勢手段により相反方向に付勢され、
前記ベルト部には一体的に後方へ延びる係止片部が設けられ、この係止片部は、前記中芯ユニットと係合して前記中芯ユニットの後方への移動を規制するとともに前記中芯ユニットと一体的に前進するように設けられ、
前記シール筒は前記軸筒と係合して前方への移動を規制され、
前記中芯ユニットの前進により前記ベルト部が前記蓋部材の前端から離脱して前記蓋部材が開放し前記筆記部が前記シール筒から突出するようにしたことを特徴とする出没式筆記具。 The shaft unit houses the core unit so that it can move back and forth.
A writing part is provided at the tip of the core unit,
The core unit is provided with an ink supply structure for supplying ink to the writing unit,
The periphery of the writing part is closed by a seal cylinder and a lid member,
The lid member is provided to rotate in front of the writing unit to open and close the front end opening of the seal cylinder,
A belt portion is detachably engaged with the front end of the lid member,
The seal cylinder and the core unit are urged in the opposite direction by the urging means,
The belt portion is integrally provided with a locking piece portion that extends rearward. The locking piece portion engages with the core unit to restrict the movement of the core unit to the rear and Provided to advance integrally with the lead unit,
The seal cylinder engages with the shaft cylinder and is restricted from moving forward,
A retractable writing instrument, wherein the belt unit is detached from the front end of the lid member by the advancement of the core unit, the lid member is opened, and the writing unit projects from the seal cylinder. 請求項１記載の出没式筆記具において、
前記軸筒には傾斜状ガイド部が設けられ、
前記傾斜状ガイド部は、前記中芯ユニットと一体的に前進する前記ベルト部に摺接して、前記ベルト部を径外方向へ撓ませることを特徴とする出没式筆記具。 The retractable writing instrument according to claim 1,
The shaft tube is provided with an inclined guide portion,
The retractable writing instrument, wherein the inclined guide portion is in sliding contact with the belt portion that moves forward integrally with the core unit to bend the belt portion in the radially outward direction. 請求項２記載の出没式筆記具において、
前記蓋部材には規制突部が設けられ、
前記規制突部は、前記ベルト部の径外方向への撓みを規制することを特徴とする出没式筆記具。 The retractable writing instrument according to claim 2,
The lid member is provided with a regulation protrusion,
The retractable writing instrument, wherein the restricting protrusion restricts bending of the belt portion in a radially outward direction. 請求項１〜３何れか１項記載の出没式筆記具において、
前記蓋部材は開放方向に付勢されていることを特徴とする出没式筆記具。 In the retractable writing instrument according to any one of claims 1 to 3,
The retractable writing instrument, wherein the lid member is biased in the opening direction. 請求項１〜４何れか１項記載の出没式筆記具において、
前記蓋部材の前端面には、前記ベルト部と係脱する係脱片が設けられ、
前記係脱片は、前記蓋部材の閉塞時には前記ベルト部と係合していることを特徴とする出没式筆記具。 In the retractable writing instrument according to any one of claims 1 to 4,
The front end surface of the lid member is provided with an engagement / disengagement piece that engages / disengages with the belt portion,
The retractable writing instrument, wherein the engaging / disengaging piece is engaged with the belt portion when the lid member is closed.

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