JP4851277B2

JP4851277B2 - Writing instrument

Info

Publication number: JP4851277B2
Application number: JP2006249108A
Authority: JP
Inventors: 裕昭山田
Original assignee: Zebra Co Ltd
Current assignee: Zebra Co Ltd
Priority date: 2006-09-14
Filing date: 2006-09-14
Publication date: 2012-01-11
Anticipated expiration: 2026-09-14
Also published as: JP2008068522A

Description

本発明は、軸筒の把持部位に滑り止めなどを目的として、弾性変形可能な軟質材料からなるグリップ（弾性把持部材）を具備した、例えばボールペンやシャープペンシルやサインペンなどの筆記具に関する。
詳しくは、軸筒の略全長に亘って筒状のグリップを具備した筆記具に関する。 The present invention relates to a writing instrument such as a ballpoint pen, a mechanical pencil, or a sign pen provided with a grip (elastic gripping member) made of an elastically deformable soft material for the purpose of preventing slipping at a gripping portion of a shaft tube.
In detail, it is related with the writing instrument which comprised the cylindrical grip over the substantially full length of the axial cylinder.

従来、この種の筆記具として、軸筒（ペン体）の略全長に亘り、ゴム或いは合成樹脂などの軟質弾性体又はシリコンゴムで筒状に形成されたグリップ（被覆体）を差し込み、このグリップのペン先側の外周面には、軸筒の把持部位に相当する箇所のみに滑り止めのための凹凸を有する握り部が形成され、その先端には先端芯体押えを装着し、後端側には後端芯体押えを装着して、グリップを挟み込むことにより、グリップの位置ズレを防止したものがある（例えば、特許文献１参照）。 Conventionally, as this type of writing instrument, a grip (cover) formed in a cylindrical shape with a soft elastic body such as rubber or synthetic resin or silicon rubber is inserted over substantially the entire length of the shaft cylinder (pen body). On the outer peripheral surface of the pen tip side, a grip portion having unevenness for preventing slipping is formed only in a portion corresponding to the gripping portion of the shaft tube, and a tip core body presser is attached to the tip of the grip portion on the rear end side. There is a type in which a grip of the grip is prevented by attaching a rear end core body presser and sandwiching the grip (see, for example, Patent Document 1).

しかし乍ら、このような従来の筆記具によれば、軸筒の略全長に被覆されるグリップがその略全長に亘って同じ外径の筒状であるため、グリップを握る際に、手指の親指から人差し指へ至る略Ｕ字型の指間皮膚表面とグリップ表面との間に隙間ができてしまい、親指と人差し指と中指の指先部分がグリップ表面（滑り止め用凹凸を有する握り部）に接触するだけで、筆記時に大きく変動する手指の把持力は指先部分のみに集中することから、手指に対するフィット感に欠け、しかも筆記時に汗などで軸方向へ滑り易く、それにより疲れ易いという問題があった。
更に、筆記時における握り方には個人差があるものの、このような千差万別の握り方の個人差に対応できなかった。
特開平２−１４１２９５号公報（第１−３頁、第１−３図） However, according to such a conventional writing instrument, since the grip that covers the substantially entire length of the shaft cylinder has a cylindrical shape with the same outer diameter over the almost entire length, when gripping the grip, the thumb of the finger A gap is formed between the surface of the approximately U-shaped skin between the finger and the index finger, and the grip surface, and the fingertip portion of the thumb, index finger, and middle finger contacts the grip surface (grip portion having anti-slip unevenness). However, the gripping force of the finger that fluctuates greatly during writing concentrates only on the fingertip part, so there is a lack of fit to the finger, and it is easy to slip in the axial direction due to sweat etc. during writing, which makes it easy to get tired .
Furthermore, although there are individual differences in gripping methods at the time of writing, such individual differences in gripping methods cannot be dealt with.
JP-A-2-141295 (page 1-3, Fig. 1-3)

本発明は、上記従来事情に鑑みてなされたもので、その課題とするところは、フィット感の向上と軸方向への滑り防止を図りながら疲れ難い筆記具を提供することにある。 The present invention has been made in view of the above-described conventional circumstances. An object of the present invention is to provide a writing instrument that is less fatigued while improving the fit and preventing slippage in the axial direction.

上記課題を解決するための手段は、軸筒と、この軸筒の軸方向略全長を覆うように筒状に挿入される弾性変形可能なグリップとを具備した筆記具において、前記グリップは、軸方向略中央の外周面に全周に亘って形成された***部と、この***部の前方へ滑らかに連続して縮径された前側の傾斜曲面部と、同***部の後方へ滑らかに連続して縮径された後側の傾斜曲面部と、前記前側の傾斜曲面部の前端に接続されて前方へ延設された前側の円筒状部分と、前記後側の傾斜曲面部の後端に接続されて後方へ延設された後側の円筒状部分とからなり、前記***部は、前方へ行くにしたがって直線状に僅かに拡径する傾斜面に形成され、この傾斜面の前端に前記前側の傾斜曲面部を接続するとともに、同傾斜面の後端に前記後側の傾斜曲面部を接続することで、縦断面略台形に拡径され、前記前側の傾斜曲面部、前記***部及び前記後側の傾斜曲面部を合わせた軸方向の長さは、前記前側の円筒状部分と前記後側の円筒状部分を合わせた軸方向の長さよりも大きく設定され、前記前側の円筒状部分と前記後側の円筒状部分は、略同径であって、且つ前記前側の円筒状部分の方が前記後側の円筒状部分よりも軸方向へ短く形成されていることを特徴とする。 Means for solving the above problems, and barrel, in a writing instrument provided with the elastic deformable grip that is inserted into a cylindrical shape so as to cover the substantially axial entire length of the barrel, the grip is axially A raised portion formed on the entire outer peripheral surface of the substantially center, a front inclined curved surface portion that is smoothly and continuously reduced in diameter toward the front of the raised portion, and smoothly continues to the rear of the raised portion. The rear inclined curved surface portion reduced in diameter, the front cylindrical portion connected to the front end of the front inclined curved surface portion and extending forward, and the rear inclined curved surface portion connected to the rear end A rear cylindrical portion extending rearward, and the raised portion is formed in an inclined surface that slightly increases in diameter linearly as it goes forward, and the front side of the inclined surface is the front side And the rear inclined curved surface portion is connected to the rear end of the inclined surface. Thus, the diameter in the longitudinal section is expanded to a substantially trapezoidal shape, and the axial length of the front inclined curved surface portion, the raised portion, and the rear inclined curved surface portion is combined with the front cylindrical portion and the rear The front cylindrical portion and the rear cylindrical portion have substantially the same diameter, and the front cylindrical portion is larger than the axial length of the combined cylindrical portions. Is formed shorter in the axial direction than the cylindrical portion on the rear side .

第一の形態では、軸筒の略全長に被覆されるグリップの軸方向略中央の外周面に、***部を全周に亘って形成し、この***部から軸方向へ滑らかに連続する傾斜曲面部を形成した。
また、第二の形態では、上記第一の形態の構成に加えて、上記グリップの少なくとも表面部分を弾性変形可能な発泡体で成形した。
また、第三の形態では、上記第一又は第二の形態の構成に加えて、上記軸筒の外周面にズレ止め用突起を設けて、グリップの内周面と軸方向及び周方向へ移動不能に係合させた。
また、第四の形態では、上記第三形態の構成に加えて、上記ズレ止め用突起を、軸筒の軸方向へ複数配置し、これらズレ止め用突起の間に適宜隙間を形成した。
また、第五の形態では、上記第一乃至第四の何れか一つの形態の構成に加えて、上記グリップの後端部に係止バンドを巻き付けることで、該グリップ後端部を圧縮変形して、軸筒に対し軸方向及び周方向へ移動不能に係止した。
上記形態は、上記構成により下記の作用効果を奏する。
第一の形態によれば、軸筒の略全長に被覆されるグリップの軸方向略中央の外周面に、***部を全周に亘って形成し、この***部から軸方向へ滑らかに連続する傾斜曲面部を形成することにより、グリップを握る際に、手指の親指から人差し指へ至る略Ｕ字型の指間皮膚表面が、***部及び傾斜曲面部の表面形状と嵌り合い、夫々が全体的に隙間なく接触可能となって、これら手指の皮膚表面とグリップ表面との接触面積が増大し、軸筒全体の振れが大幅に減少して手指とグリップが一体化されると共に、把持力がグリップに伝わると、親指と人差し指と中指の指先部分だけでなく、***部及び傾斜曲面部の表面部分が手指の形状に合わせて適度に弾性変形して、把持力が均一に分散する。
従って、フィット感の向上と軸方向への滑り防止を図りながら疲れ難い筆記具を提供することができる。
よって、軸筒略全長に被覆したグリップ全体がその略全長に亘って同じ外径の筒状である従来技術と比べ、筆記時に大きく変動する手指の把持力を均一に分散すると共に吸収できるから、手指を動かす筋活動量が減少し、その結果、長時間に亘り筆記した際の疲労の蓄積は少なくなる。
更に、筆記時における握り方に個人差があったとしても、***部及び傾斜曲面部の表面形状に沿って握り方を矯正する作用もあるため、千差万別の握り方の個人差に対応できて、握り方の個人差に関係なく全ての使用者に対して疲れ難い筆記具を提供することができる。 In the first embodiment, a bulging portion is formed over the entire circumference on the outer circumferential surface at the substantially axial center of the grip that covers the substantially entire length of the shaft cylinder, and the inclined curved surface that continues smoothly from the bulging portion in the axial direction. Part was formed.
In the second embodiment, in addition to the configuration of the first embodiment, at least the surface portion of the grip is formed of a foam that can be elastically deformed.
Further, in the third mode, in addition to the configuration of the first or second mode, a protrusion for preventing misalignment is provided on the outer peripheral surface of the shaft tube, and the gripper moves in the axial direction and the peripheral direction with respect to the inner peripheral surface of the grip. Engaged impossible.
In the fourth embodiment, in addition to the configuration of the third embodiment, a plurality of the protrusions for preventing misalignment are arranged in the axial direction of the shaft cylinder, and a gap is appropriately formed between the protrusions for preventing misalignment.
Further, in the fifth mode, in addition to the configuration of any one of the first to fourth modes, the grip rear end is compressed and deformed by winding a locking band around the rear end of the grip. Thus, the shaft cylinder is locked so as not to move in the axial direction and the circumferential direction.
The said form has the following effects by the said structure.
According to a first embodiment, the outer peripheral surface of the substantially axial center of the grip to be coated on substantially the entire length of the barrel, and formed over a raised portion all around, smoothly continuous from the raised portions in the axial direction By forming the inclined curved surface part, when gripping the grip, the substantially U-shaped inter-finger skin surface from the thumb of the finger to the index finger fits with the surface shape of the raised part and the inclined curved surface part, respectively. The contact area between the skin surface of these fingers and the grip surface is increased, the shake of the entire barrel is greatly reduced, and the fingers and the grip are integrated, and the gripping force is gripped. , Not only the fingertip portions of the thumb, forefinger, and middle finger, but also the surface portions of the raised portion and the inclined curved surface portion are appropriately elastically deformed according to the shape of the fingers, and the gripping force is uniformly dispersed.
Therefore, it is possible to provide a writing instrument that is less likely to get tired while improving the fit and preventing slipping in the axial direction.
Therefore, compared with the prior art in which the entire grip covering the entire length of the shaft cylinder is a cylindrical shape having the same outer diameter over the entire length, the gripping force of the finger that varies greatly during writing can be uniformly dispersed and absorbed, The amount of muscle activity that moves the fingers is reduced, and as a result, the accumulation of fatigue when writing for a long time is reduced.
Furthermore, even if there are individual differences in how to grip during writing, there is also an action to correct the grip along the surface shape of the raised and inclined curved surface parts, so it corresponds to individual differences in gripping methods Thus, it is possible to provide a writing instrument that is less tiring for all users regardless of individual differences in gripping methods.

第二の形態によれば、グリップの少なくとも表面部分を弾性変形可能な発泡体で成形することにより、グリップを握る際に硬度が柔らかくなって、把持力が適度に分散し吸収されると共に、グリップ全体の軽量化が図れる。
従って、更に疲れ難くすることができる。
よって、更に長時間に亘り筆記時間を更に延ばすことができる。 According to the second embodiment , at least the surface portion of the grip is formed of a foam that can be elastically deformed, so that the hardness becomes soft when gripping the grip, the gripping force is dispersed and absorbed appropriately, and the grip The overall weight can be reduced.
Therefore, it is possible to further reduce fatigue.
Therefore, the writing time can be further extended for a longer time.

第三の形態によれば、軸筒の外周面にズレ止め用突起を設けて、グリップの内周面と軸方向及び周方向へ移動不能に係合させることにより、軸筒の外周面に対してグリップが軸方向及び周方向へ移動不能に保持される。
従って、グリップの位置ズレを防止することができる。
よって、筆記具がノック式シャーペンである場合のノック操作時や、ノック式ボールペンである場合のノック時において、グリップが変形しないと共に、組み立て時やメンテナンス時において、先口などを回して着脱する際に、グリップがズレ止め用突起により空回り変形せず、この空回りに伴うグリップの軸方向及び周方向への伸び変形を防止できるから、グリップの耐久性が低下しない。
特に、このズレ止め用突起を、グリップの拡径された***部及び傾斜曲面部の下に配置すれば、グリップを握った際にその把持力が***部及び傾斜曲面部から他の部分よりも強くズレ止め用突起へ伝わるため、グリップの位置ズレ防止機能を向上できる。 According to a third aspect, by providing a displacement stop protrusion on the outer peripheral surface of the barrel, by immovable engaged to the inner circumferential surface in the axial direction and the circumferential direction of the grip, relative to the outer peripheral surface of the barrel Thus, the grip is held immovable in the axial direction and the circumferential direction.
Accordingly, it is possible to prevent the displacement of the grip.
Therefore, when knocking when the writing instrument is a knock-type mechanical pen, or when knocking when it is a knock-type ballpoint pen, the grip does not deform, and when assembling or maintenance, turning the tip etc. The grip is not deformed idly by the protrusion for preventing misalignment, and the grip can be prevented from being deformed in the axial direction and circumferential direction due to the idling, so that the durability of the grip is not lowered.
In particular, if this protrusion for preventing misalignment is disposed under the bulged portion and the inclined curved surface portion where the diameter of the grip is expanded, the gripping force is greater than the other portions from the bulged portion and the inclined curved surface portion when gripping the grip. Since it is strongly transmitted to the misalignment projection, the grip misalignment prevention function can be improved.

第四の形態によれば、ズレ止め用突起を、軸筒の軸方向へ複数配置し、これらズレ止め用突起の間に適宜隙間を形成することにより、軸筒の外周面に沿ったグリップの挿入に伴って環状突起及び縦突起を乗り越える際に、グリップとの摩擦抵抗が開放されて、その挿入方向先端部が内側にめくれ込み難くなる。
従って、軸筒へのグリップの挿入をスムーズに行うことができる。
よって、組立て作業が容易になって製作時間を短縮化してコストの低減が図れる。 According to the fourth embodiment , a plurality of misalignment projections are arranged in the axial direction of the shaft cylinder, and an appropriate gap is formed between these misalignment projections so that the grip along the outer peripheral surface of the shaft cylinder is formed. When the annular protrusion and the vertical protrusion are overcome with the insertion, the frictional resistance with the grip is released, and the distal end portion in the insertion direction is difficult to turn inside.
Accordingly, the grip can be smoothly inserted into the shaft tube.
Therefore, the assembling work is facilitated, the manufacturing time can be shortened, and the cost can be reduced.

第五の形態によれば、グリップの後端部に係止バンドを巻き付け、該グリップ後端部を圧縮変形して、軸筒に対し軸方向及び周方向へ移動不能に係止することにより、筆圧がグリップに作用しても、係止バンドの保持力でグリップの後端部が軸筒の外周面に沿って前方へ位置ズレしない。
従って、手指の形状に合わせて変形し易い低硬度のグリップであっても筆圧に伴う位置ズレを防止することができる。
よって、グリップの位置ズレによって変形しないため、グリップの耐久性が低下することを防止できる。 According to the fifth aspect , by winding a locking band around the rear end portion of the grip, compressing and deforming the grip rear end portion, and locking the shaft cylinder so as to be immovable in the axial direction and the circumferential direction, Even if the writing pressure acts on the grip, the rear end portion of the grip is not displaced forward along the outer peripheral surface of the shaft cylinder by the holding force of the locking band.
Therefore, even if the grip has a low hardness and easily deforms in accordance with the shape of the finger, it is possible to prevent a positional shift due to the writing pressure.
Therefore, since the grip is not deformed by the displacement of the grip, it is possible to prevent the grip durability from being lowered .

次に、上記形態についてより具体的に説明すれば、筆記具Ａは、図１〜図４に示す如く、軸筒１と、この軸筒１の軸方向略全長を覆うように挿入される弾性変形可能な筒状のグリップ２と、このグリップ２よりも先端側（前端側）に配置される先口３とを備え、この先口３の末端側（後端側）から軸筒１の後端又は後端近くまでグリップ２が、該軸筒１の略全長を覆うように挿着されたものである。 Next, the above-described embodiment will be described more specifically . As shown in FIGS. 1 to 4 , the writing instrument A is an elastic deformation that is inserted so as to cover the axial tube 1 and substantially the entire axial length of the axial tube 1. A possible cylindrical grip 2 and a front end 3 disposed on the front end side (front end side) of the grip 2, and the rear end or the rear end of the shaft tube 1 from the end side (rear end side) of the front end 3 The grip 2 is inserted and attached so as to cover the substantially entire length of the shaft tube 1 to the vicinity of the rear end.

前記グリップ２は、その全体或いは少なくとも表面部分のみを弾性変形可能な材料で成形した略円筒体か又は断面三角形や多角形などの角筒体であり、その軸方向略中央の外周面には、その他の部分よりも大径な***部２ａを全周に亘って形成し、この***部２ａから先口３が配置される前方（図面では下方）と、その逆方向の後方（図面では上方）の両側へ向けて滑らかに連続する傾斜曲面部２ｂを夫々形成するか、又は少なくとも前方のみへ向けて滑らかに連続する傾斜曲面部２ｂを形成する。 The grip 2 is a substantially cylindrical body formed of an elastically deformable material as a whole or at least only a surface portion thereof, or a rectangular tube body such as a triangular or polygonal cross section. A bulging portion 2a having a larger diameter than the other portions is formed over the entire circumference, and the front (downward in the drawing) from which the leading opening 3 is disposed from the bulging portion 2a and the backward in the opposite direction (upward in the drawing). The sloped curved surface portion 2b that smoothly continues toward both sides of each other is formed, or the sloped curved surface portion 2b that smoothly continues toward only the front side is formed.

詳しく説明すれば、グリップ２の軸方向略中央とは、軸筒１の軸方向中央位置よりもやや前方の位置であり、これを中心として***部２ａを配置し、図示例ではこの***部２ａの前後両方に一対の傾斜曲面部２ｂを配置して、縦断面略台形に拡径している。 More specifically, the approximate center in the axial direction of the grip 2 is a position slightly ahead of the central position in the axial direction of the barrel 1, and a raised portion 2 a is arranged around this, and in the illustrated example, this raised portion 2 a. A pair of inclined curved surface portions 2b are arranged on both the front and rear sides of the plate to expand the diameter into a substantially trapezoidal longitudinal section.

更に、前記グリップ２の成形材料としては、例えばゴムやシリコーンゴムやエラストマーなどの低硬度な弾性材料を使用するか、又は合成樹脂からなる弾性変形可能な発泡体などの低硬度な弾性材料を使用して、該グリップ２を握った際にその硬度が柔軟になって、手指の握る力（把持力）を適度に分散・吸収させると共に、グリップ２の軽量化をも図ることで、長時間に亘り使用しても疲れ難くなるようにしている。 Further, as the molding material of the grip 2, for example, a low-hardness elastic material such as rubber, silicone rubber, or elastomer is used, or a low-hardness elastic material such as an elastically deformable foam made of a synthetic resin is used. And when the grip 2 is gripped, its hardness becomes flexible and the gripping force of the fingers (gripping force) is appropriately dispersed and absorbed, and the weight of the grip 2 can be reduced for a long time. Even if you use it for a long time, it is hard to get tired.

前記グリップ２の成形材料として弾性変形可能な発泡体を使用する場合には、軽量で適度な摩擦抵抗が得られるため好ましく、特に例えばエチレン−酢酸ビニル共重合体（ＥＶＡ）やポリエチレンの架橋発泡体、塩化ビニルの発泡体、スチレン系エラストマーの発泡体などの独立気泡構造の発泡体で、表面硬度（Ｃタイプ硬度計、JIS Ｋ 6767）が１５〜３０度、反発弾性（JIS Ｋ 6400）が１５％以下、見かけ密度（JIS Ｋ 6767）が０．０８〜０．１７g/cm3のものを使用すれば、把持力が適度に分散する低反発特性を有しながら耐久性にも優れている。 When a foam that can be elastically deformed is used as the molding material of the grip 2, it is preferable because it is lightweight and has an appropriate frictional resistance. Particularly, for example, an ethylene-vinyl acetate copolymer (EVA) or a crosslinked polyethylene foam. , Foam of closed cell structure such as foam of vinyl chloride, foam of styrene elastomer, surface hardness (C type hardness meter, JIS K 6767) is 15 to 30 degrees, rebound resilience (JIS K 6400) is 15 % Or less and an apparent density (JIS K 6767) of 0.08 to 0.17 g / cm 3 is excellent in durability while having low resilience characteristics in which the gripping force is appropriately dispersed.

即ち、表面硬度が１５度以下の場合には、把持力が強いとグリップ２だけで緩衝しきれず軸体１の硬さを感じ、握り安定性が劣ると共に指が動いて伸び変形してしまい、また表面硬度が３０度以上となると握った際のグリップ２の応力が高く、手指の形状に合わせたグリップ２の変形が起こり難く、長時間に亘る筆記に伴って疲労し易くなる。
反発弾性が１５％を越えた場合には、圧縮に対する発泡体の反発力が大きいため、長時間に亘り使用すると疲労が溜まり易くなり、特に子供や老人などの把持力が低い使用者の場合には使い難い。
見かけ密度が０．０８より軽い場合には、発泡体自体の強度も落ちてしまい長期間に亘る使用に伴って把持力による歪み、磨耗が発生して耐えられず、また見かけ密度が０．１７より大きい場合には、グリップ２の重量が大きくなってしまうため、疲労の原因となる。 That is, when the surface hardness is 15 degrees or less, if the gripping force is strong, the grip 2 alone cannot be fully buffered and the shaft body 1 feels the hardness, the gripping stability is inferior and the finger moves and deforms. Further, when the surface hardness is 30 degrees or more, the grip 2 has a high stress when grasped, the deformation of the grip 2 in accordance with the shape of the finger hardly occurs, and fatigue tends to occur with writing over a long time.
When the resilience exceeds 15%, the foam has a large repulsion force against compression, so fatigue tends to accumulate when used for a long time, especially for users with low gripping force such as children and the elderly. Is difficult to use.
When the apparent density is lighter than 0.08, the strength of the foam itself also decreases, and it cannot be tolerated due to distortion and wear due to gripping force with use over a long period of time, and the apparent density is 0.17. If it is larger, the weight of the grip 2 becomes larger, which causes fatigue.

そして、このような弾性材料で成形されたグリップ２は、前記軸筒１の外周面１ａに対して位置ズレしないように、その内径を軸筒１の外径よりも若干小さくし、軸筒外周面１ａに沿って挿入した状態で、該グリップ２の内周面２ｃを軸筒外周面１ａと密着させて、これら両者間に大きな摩擦抵抗が発生するようにしている。 The grip 2 formed of such an elastic material has an inner diameter slightly smaller than the outer diameter of the shaft tube 1 so that the grip 2 is not displaced with respect to the outer surface 1a of the shaft tube 1, In a state where the grip 2 is inserted along the surface 1a, the inner peripheral surface 2c of the grip 2 is brought into close contact with the outer peripheral surface 1a of the shaft cylinder so that a large frictional resistance is generated between them.

更に、この軸筒外周面１ａには、前記グリップ２の内周面２ｃと係合するズレ止め用突起を設けて、これをグリップ内周面２ｃに密着させることにより、軸筒外周面１ａに対してグリップ２を軸方向及び周方向へ移動不能に保持する。
特に、このズレ止め用突起は、前記グリップ２の拡径された***部２ａ及び傾斜曲面部２ｂの下に配置すれば、グリップ２を握った際にその把持力が***部２ａ及び傾斜曲面部２ｂから他の部分よりも強くズレ止め用突起へ伝わるため、グリップ２の位置ズレ防止機能が向上する。 Further, the shaft cylinder outer peripheral surface 1a is provided with a slip-preventing protrusion that engages with the inner peripheral surface 2c of the grip 2 and is brought into close contact with the grip inner peripheral surface 2c. On the other hand, the grip 2 is held immovably in the axial direction and the circumferential direction.
In particular, if the protrusion for preventing misalignment is disposed below the bulged portion 2a and the inclined curved surface portion 2b with the diameter increased, the gripping force when the grip 2 is gripped is increased by the raised portion 2a and the inclined curved surface portion. Since it is transmitted from 2b to the protrusion for preventing displacement more strongly than other parts, the function of preventing the displacement of the grip 2 is improved.

このズレ止め用突起の具体例としては、少なくとも周方向へ延びる環状突起１ｂと、軸方向へ延びる縦突起１ｃとを備え、図示例の場合には、軸方向の中央に縦突起１ｃを配置し、これを挟んで前後に一対の環状突起１ｂを配置している。 As a specific example of this misalignment projection, at least an annular projection 1b extending in the circumferential direction and a vertical projection 1c extending in the axial direction are provided. In the illustrated example, the vertical projection 1c is arranged at the center in the axial direction. A pair of annular projections 1b are arranged on the front and rear sides of this.

これら環状突起１ｂ及び縦突起１ｃは、軸筒１外周面１ａに対するグリップ２の挿入方向へ夫々の外径が徐々に拡径するように傾斜させるか又は円弧状に形成することにより、軸筒外周面１ａに沿ってグリップ２を挿入する際に、該環状突起１ｂ及び縦突起１ｃをスムーズに乗り越えられるようにしている。 The annular protrusion 1b and the vertical protrusion 1c are inclined so that their outer diameters gradually increase in the insertion direction of the grip 2 with respect to the outer peripheral surface 1a of the shaft cylinder 1 or are formed in an arc shape so that the outer periphery of the shaft cylinder When the grip 2 is inserted along the surface 1a, the annular protrusion 1b and the vertical protrusion 1c can be smoothly overcome.

また、これら環状突起１ｂ及び縦突起１ｃを軸筒１の軸方向へ複数配置した場合には、夫々が軸方向へ連続して配置されると、軸筒外周面１ａに沿ったグリップ２の挿入に伴って環状突起１ｂ及び縦突起１ｃを乗り越える際に、大きな摩擦抵抗が連続するため、該グリップ２の挿入方向先端部２ｄが内側にめくれて入り込むため、環状突起１ｂと縦突起１ｃとの間に適宜寸法の隙間を夫々形成することにより、グリップ２との摩擦抵抗を開放して、その挿入方向先端部２ｄが内側にめくれ込むことを防止している。
実験によれば、グリップ２の成形材料が上述した独立気泡構造の弾性変形可能な発泡体である場合には、環状突起１ｂと縦突起１ｃとの間に軸方向へ約５ｍｍ以上の隙間があれば、グリップ２の挿入方向先端部２ｄが内側にめくれ込むことなく、スムーズに挿入することができた。
以下、本発明の一実施例を図面に基づいて説明する。 Further, when a plurality of the annular protrusions 1b and the vertical protrusions 1c are arranged in the axial direction of the shaft cylinder 1, if each of them is continuously arranged in the axial direction, the grip 2 is inserted along the outer peripheral surface 1a of the shaft cylinder. As a result, a large frictional resistance continues when the annular protrusion 1b and the vertical protrusion 1c are overcome, so that the tip 2d in the insertion direction of the grip 2 turns inside and enters, so that there is a gap between the annular protrusion 1b and the vertical protrusion 1c. By forming gaps of appropriate dimensions, the frictional resistance with the grip 2 is released, and the tip end 2d in the insertion direction is prevented from turning inward.
According to the experiment, when the molding material of the grip 2 is the above-mentioned foam having the closed cell structure and elastically deformable, there is a gap of about 5 mm or more in the axial direction between the annular protrusion 1b and the vertical protrusion 1c. In this case, the grip 2 could be smoothly inserted without the tip 2d in the insertion direction being turned inward.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

この実施例１は、図１〜図３に示す如く、上記軸筒１の前端部外周面に先口３を螺合接続し、この先口３と独立気泡構造の弾性変形可能な発泡体からなるグリップ２との間に弾性リング４を挟み込むように配置し、該グリップ２の後端部２ｅに係止バンド５を巻き付けることにより、該グリップ後端部２ｅを圧縮変形して、軸筒１に対し軸方向及び周方向へ移動不能に保持すると共に、この係止バンド５の外側に尾栓６を被せることで、係止バンド５が拡径し外れないようにしたものである。 As shown in FIGS. 1 to 3, the first embodiment includes a front opening 3 threadedly connected to the outer peripheral surface of the front end portion of the shaft cylinder 1, and is formed of an elastically deformable foam having an closed cell structure. The elastic ring 4 is disposed between the grip 2 and the engaging band 5 is wound around the rear end 2e of the grip 2 to compress and deform the rear end 2e of the grip. In contrast, the locking band 5 is held so as not to move in the axial direction and the circumferential direction, and the locking band 5 is covered with a tail plug 6 to prevent the locking band 5 from expanding and coming off.

前記弾性リング４は、グリップ２よりも硬質なゴムや弾性合成樹脂材料から形成され、特に軸筒１の先端側に位置する先口３の近傍を把持する使用者に対し、その把持感触を良好にすると共に、把持する手が筆圧により前方へずれてしまうのを防ぐようにしている。 The elastic ring 4 is made of rubber or an elastic synthetic resin material that is harder than the grip 2, and has a good grip feeling especially for a user who holds the vicinity of the tip 3 located on the distal end side of the shaft tube 1. In addition, the gripping hand is prevented from being displaced forward by the writing pressure.

前記係止バンド５は、例えばポリプロピレンなどの合成樹脂などの材料で、少なくともその一部が弾性変形可能な帯板状に形成され、上記グリップ２の外周面沿いに巻き付けてから環状に係止することにより、グリップ２の外周面を適度に締め付けて圧縮変形させ、その弾発力を利用して該係止バンド５の係止状態が維持されると共に、この係止バンド５の内端部を前記軸筒１に対して軸方向及び周方向へ係止させることにより、これら係止バンド５及びグリップ２が軸筒１に対して軸方向及び周方向へ移動不能に保持される構造にしている。 The locking band 5 is made of a material such as a synthetic resin such as polypropylene, and at least a part of the locking band 5 is formed into an elastically deformable band plate shape, and is wound around the outer peripheral surface of the grip 2 and then locked in an annular shape. As a result, the outer peripheral surface of the grip 2 is appropriately tightened and compressed and deformed, and the locking state of the locking band 5 is maintained using the elastic force, and the inner end portion of the locking band 5 is By locking the shaft tube 1 in the axial direction and the circumferential direction, the locking band 5 and the grip 2 are held so as to be immovable in the axial direction and the circumferential direction with respect to the shaft tube 1. .

この係止バンド５を詳しく説明すれば、図３に示す如く、上記グリップ２の外周面に沿って円弧状に湾曲した帯板部５ａと、この帯板部５ａの周方向適宜間隔毎に配置された弾性変形可能な肉薄部５ｂと、この帯板部５ａの周方向両端近くに配置された互いに嵌り合う連結部５ｃとを具備し、前記肉薄部５ｂから屈曲して帯板部５ａをグリップ２の外周面に沿った環状に巻き付けてから、前記連結部５ｃを上記軸筒１の径方向へ重ね合わせて相互に嵌合させることにより、係止バンド５全体を環状に係止している。 The locking band 5 will be described in detail. As shown in FIG. 3, the band plate portion 5a curved in an arc shape along the outer peripheral surface of the grip 2, and the band plate portion 5a are arranged at appropriate intervals in the circumferential direction. The elastically deformable thin portion 5b and the connecting portions 5c arranged near both ends in the circumferential direction of the strip plate portion 5a, and bend from the thin portion 5b to grip the strip plate portion 5a. 2, the whole of the locking band 5 is locked in an annular shape by winding the connecting portion 5c in the radial direction of the shaft tube 1 and fitting them together. .

この帯板部５ａの内周には、係止凸部５ｄを突設し、この係止凸部５ｄと、上記軸筒１の後端に形成される貫通孔や溝などの凹部１ｄとを軸筒１の径方向へ嵌合させることで、係止バンド５を軸筒１に対して軸方向及び周方向へ移動不能に係止している。 A locking projection 5d is provided on the inner periphery of the band plate portion 5a. The locking projection 5d and a recess 1d such as a through hole or a groove formed at the rear end of the shaft tube 1 are provided. By engaging the shaft cylinder 1 in the radial direction, the locking band 5 is locked to the shaft cylinder 1 so as not to move in the axial direction and the circumferential direction.

更に、前記帯板部５ａには、その周方向へ適宜間隔毎に開穿された貫通孔や溝などの係合凹部５ｅを複数個夫々設け、該係止バンド５で圧縮変形されたグリップ２の弾発力を利用して、その表面を各係合凹部５ｅに食い込ませることにより、係止バンド５に対するグリップ２の周方向や軸方向などへの位置ズレを防止すると共に、係止バンド５で圧縮変形されたグリップ２の逃げ部分となって、係止バンド５からのはみ出し量が軽減され、組立てを容易にしている。 Further, the band plate portion 5a is provided with a plurality of engaging recesses 5e such as through holes and grooves opened at appropriate intervals in the circumferential direction, and the grip 2 compressed and deformed by the locking band 5 is provided. By utilizing the elastic force of the engagement band 5, the surface of the engagement recess 5 e is bitten to prevent the grip band 2 from being displaced in the circumferential direction or the axial direction, and the engagement band 5. As a result, the amount of protrusion from the locking band 5 is reduced and the assembly is facilitated.

また、前記帯板部５ａの内周面には、前記グリップ２の外周面に食い込んで軸方向へ係合する係止段部５ｆを形成することにより、環状に係止された係止バンド５の内周面からグリップ２の外周面が少なくとも前方へ位置ズレすることを防止している。 Further, the locking band 5 locked in an annular shape is formed on the inner peripheral surface of the band plate portion 5a by forming a locking step portion 5f that bites into the outer peripheral surface of the grip 2 and engages in the axial direction. The outer peripheral surface of the grip 2 is prevented from being displaced at least forward from the inner peripheral surface.

そして、上記尾栓６は、上記軸筒１の後端部に対して被せた状態で、前記係止バンド５と対向する部分の内径が、前記連結部５ｃで環状に係止された係止バンド５の外径と略同じになるようにして、該係止バンド５の拡径を防止している。 Then, the tail plug 6 is covered with the rear end portion of the shaft tube 1, and the inner diameter of the portion facing the locking band 5 is locked in an annular shape by the connecting portion 5c. The diameter of the locking band 5 is prevented from expanding so as to be substantially the same as the outer diameter of the band 5.

また、この尾栓６は、図示例の場合、上記軸筒１の後端外周面に螺合接続することで、軸筒１と一体的に連結され、該尾栓６の後端開口部には、必要に応じて化粧キャップ６ａを着脱自在に嵌合して閉鎖している。 Further, in the illustrated example, the tail plug 6 is integrally connected to the shaft cylinder 1 by screwing and connected to the outer peripheral surface of the rear end of the shaft cylinder 1, and is connected to the rear end opening of the tail plug 6. Detachably fits the makeup cap 6a as necessary.

更に、図示例の場合には、上記軸筒１の内部にリフィール７を組み込んで、その筆記先端部７ａを先口３から常時突出させると共に、この筆記先端部７ａをキャップ８で着脱自在に覆ったボールペンである場合を示している。 Furthermore, in the case of the illustrated example, the refill 7 is incorporated into the shaft cylinder 1 so that the writing tip 7a always protrudes from the tip 3 and the writing tip 7a is detachably covered with a cap 8. This shows the case of a ballpoint pen.

次に、斯かる筆記具Ａの作用効果について説明する。
上記グリップ２の軸方向略中央の外周面１ａには、***部２ａとそれら軸方向へ滑らかに連続する傾斜曲面部２ｂとがあるため、これを使用者が握ると、図４に示す如く、手指の親指Ｆ１から人差し指Ｆ２と中指Ｆ３の指先部分が、該グリップ２の表面に接触するだけでなく、親指Ｆ１から人差し指Ｆ２へ至る略Ｕ字型の指間皮膚表面Ｆ４が、***部２ａ及び傾斜曲面部２ｂの表面形状と嵌り合い、夫々が全体的に隙間なく接触可能となる。 Next, the effect of the writing instrument A will be described.
Since the outer peripheral surface 1a at the substantially center in the axial direction of the grip 2 has a raised portion 2a and an inclined curved surface portion 2b that smoothly continues in the axial direction, when the user grasps it, as shown in FIG. The fingertip portions of the index finger F2 and the middle finger F3 from the thumb F1 of the finger not only contact the surface of the grip 2, but a substantially U-shaped inter-finger skin surface F4 extending from the thumb F1 to the index finger F2 includes a raised portion 2a and It fits with the surface shape of the inclined curved surface portion 2b, and each can be contacted without any gap.

これに対し、特開平２−１４１２９５号公報に開示されるようなグリップ２′がその略全長に亘って同じ外径の筒状である筆記具Ａ′を使用者が握ると、図５に示す如く、親指Ｆ１から人差し指Ｆ２と中指Ｆ３の指先部分が、該グリップ２′表面の握り部２ｆ′に接触するだけで、親指Ｆ１から人差し指Ｆ２へ至る略Ｕ字型の指間皮膚表面Ｆ４とグリップ２′表面との間に隙間Ｓができてしまい、筆記時に大きく変動する手指の把持力は指先部分のみに集中してしまった。 On the other hand, when the user grips the writing instrument A ′ having the same outer diameter throughout the entire length of the grip 2 ′ as disclosed in JP-A-2-141295, as shown in FIG. 5. When the fingertip portions of the index finger F2 and the middle finger F3 from the thumb F1 come into contact with the grip portion 2f ′ on the surface of the grip 2 ′, the substantially U-shaped inter-finger skin surface F4 extending from the thumb F1 to the index finger F2 and the grip 2 A gap S is formed between the surface and the gripping force of the finger, which fluctuates greatly during writing, is concentrated only on the fingertip portion.

それにより、本発明の筆記具Ａは、手指の皮膚表面とグリップ２表面との接触面積が増大し、軸筒１全体の振れが大幅に減少して手指とグリップ２が一体化され、更に手指の握る力（把持力）がグリップ２に伝わると、親指Ｆ１と人差し指Ｆ２と中指Ｆ４の指先部分だけでなく、***部２ａ及び傾斜曲面部２ｂの表面部分が手指の形状に合わせて適度に弾性変形し、把持力が均一に分散して、手指に対するフィット感が向上すると共に、汗などによる軸方向への滑り防止が図れる。 As a result, the writing instrument A according to the present invention increases the contact area between the skin surface of the finger and the surface of the grip 2, greatly reduces the shake of the entire barrel 1, and integrates the finger and the grip 2. When gripping force (gripping force) is transmitted to the grip 2, not only the fingertip portions of the thumb F1, the index finger F2, and the middle finger F4 but also the surface portions of the raised portion 2a and the inclined curved surface portion 2b are appropriately elastically deformed according to the shape of the fingers. In addition, the gripping force is evenly distributed to improve the fit with the fingers and prevent slippage in the axial direction due to sweat or the like.

また、軸筒１の外周面１ａに設けられた軸方向及び周方向へのズレ止め用突起１ｂ，１ｃと、グリップ２の内周面２ｃとの係合で、軸筒１に対するグリップ２の軸方向や周方向への位置ズレが防止される。 The shaft 2 of the grip 2 with respect to the shaft cylinder 1 is engaged with the axially and circumferentially-displacement protrusions 1b, 1c provided on the outer peripheral surface 1a of the shaft cylinder 1 and the inner peripheral surface 2c of the grip 2. Misalignment in the direction and circumferential direction is prevented.

特に、グリップ２の後端部２ｅを係止バンド５で軸筒１に対して軸方向及び周方向へ移動不能に保持した場合には、組立性や美観が優れるだけでなく、前方への位置ズレ防止機能にもに優れるため、好ましい。 In particular, when the rear end 2e of the grip 2 is held by the locking band 5 so as not to move in the axial direction and the circumferential direction with respect to the shaft cylinder 1, not only the assembly and aesthetics are excellent, but also the forward position. This is preferable because it is excellent in the function of preventing misalignment.

尚、上述したグリップ２の全体形状は図示例の形状に限定されず、その軸方向略中央の外周面１ａに***部２ａと傾斜曲面部２ｂがあれば、例えば***部２ａ及び傾斜曲面部２ｂを複数個ずつ配置したり、これら***部２ａ及び傾斜曲面部２ｂが配置される箇所以外の部分に、指の形状に合わせて凹凸を形成しても良い。
更に、上述したズレ止め用突起も環状突起１ｂ及び縦突起１ｃのみに限定されず、それ以外の形状の突起を追加したり、図示例以外の配置とするなどしても良い。 Note that the overall shape of the grip 2 described above is not limited to the shape in the illustrated example, and if there is a raised portion 2a and an inclined curved surface portion 2b on the outer peripheral surface 1a in the approximate center in the axial direction, for example, the raised portion 2a and the inclined curved surface portion 2b. Alternatively, a plurality of protrusions and recesses may be formed in accordance with the shape of the finger in portions other than the portions where the raised portions 2a and the inclined curved surface portions 2b are disposed.
Further, the above-described misalignment-preventing protrusion is not limited to the annular protrusion 1b and the vertical protrusion 1c, but protrusions having other shapes may be added, or an arrangement other than the illustrated example may be employed.

そして、前示実施例では、グリップ２と先口３との間に弾性リング４を挟み込むように配置し、グリップ２の後端部２ｅを係止バンド５で軸筒１に対し軸方向及び周方向へ移動不能に保持する場合を示したが、本発明は、これに限定されず、弾性リング４無しでグリップ２の前端を先口３の後端面に直接当接させたり、グリップ２の後端部２ｄを係止バンド５以外の係止手段で軸方向へ移動不能に保持しても良い。 In the previous embodiment, the elastic ring 4 is disposed between the grip 2 and the front opening 3, and the rear end 2 e of the grip 2 is axially and circumferentially connected to the shaft cylinder 1 by the locking band 5. However, the present invention is not limited to this, and the front end of the grip 2 can be brought into direct contact with the rear end surface of the front port 3 without the elastic ring 4 or the rear of the grip 2. The end 2d may be held immovably in the axial direction by a locking means other than the locking band 5.

また図示例では、上記軸筒１の内部に組み込んだリフィール７の筆記先端部７ａを先口３から常時突出させ、キャップ８で着脱自在に覆ったボールペンである場合を示したが、本発明は、これに限定されず、ノック操作や回転操作によって筆記先端部７ａを出没させる構造のボールペンや、それ以外の例えばシャープペンシルやサインペンなどであっても良い。
また更に、軸筒１を分離不能な一体構造としているが、本発明は、これに限定されず、軸筒１を、前軸と後軸との螺着接合などにより分離可能な一体構造としても良い。 Further, in the illustrated example, a case is shown in which the writing tip 7a of the refill 7 incorporated in the shaft cylinder 1 is always protruded from the tip 3 and is detachably covered with a cap 8. However, the present invention is not limited to this, and a ballpoint pen having a structure in which the writing tip portion 7a is made to appear and disappear by a knocking operation or a rotation operation, or other types such as a mechanical pencil or a sign pen may be used.
Furthermore, although the shaft cylinder 1 has an integral structure that cannot be separated, the present invention is not limited to this, and the shaft cylinder 1 may have an integral structure that can be separated by screwing and joining the front shaft and the rear shaft. good.

本発明の筆記具の一実施例を示す一部切欠した正面図である。It is the front view partly notched which shows one Example of the writing instrument of this invention. 分解状態を縮小して示す一部切欠正面図である。It is a partially notched front view which reduces and shows a decomposition | disassembly state. 図１の（３）−（３）に沿える部分拡大横断底面図である。FIG. 3 is a partially enlarged cross-sectional bottom view along (3)-(3) in FIG. 1. 筆記状態を示す部分的な斜視図である。It is a partial perspective view which shows a writing state. 従来の筆記具による筆記状態の一例を示す部分的な斜視図である。It is a partial perspective view which shows an example of the writing state by the conventional writing instrument.

１軸筒１ａ外周面
１ｂズレ止め用突起（環状突起）１ｃズレ止め用突起（縦突起）
２グリップ２ａ ***部
２ｂ傾斜曲面部２ｃ内周面
２ｅ後端部５係止バンド DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Peripheral surface 1b Misalignment protrusion (annular protrusion) 1c Misalignment protrusion (vertical protrusion)
2 Grip 2a Raised portion 2b Inclined curved surface portion 2c Inner circumferential surface 2e Rear end portion 5 Locking band

Claims

軸筒と、この軸筒の軸方向略全長を覆うように筒状に挿入される弾性変形可能なグリップとを具備した筆記具において、
前記グリップは、軸方向略中央の外周面に全周に亘って形成された***部と、この***部の前方へ滑らかに連続して縮径された前側の傾斜曲面部と、同***部の後方へ滑らかに連続して縮径された後側の傾斜曲面部と、前記前側の傾斜曲面部の前端に接続されて前方へ延設された前側の円筒状部分と、前記後側の傾斜曲面部の後端に接続されて後方へ延設された後側の円筒状部分とからなり、
前記***部は、前方へ行くにしたがって直線状に僅かに拡径する傾斜面に形成され、この傾斜面の前端に前記前側の傾斜曲面部を接続するとともに、同傾斜面の後端に前記後側の傾斜曲面部を接続することで、縦断面略台形に拡径され、
前記前側の傾斜曲面部、前記***部及び前記後側の傾斜曲面部を合わせた軸方向の長さは、前記前側の円筒状部分と前記後側の円筒状部分を合わせた軸方向の長さよりも大きく設定され、
前記前側の円筒状部分と前記後側の円筒状部分は、略同径であって、且つ前記前側の円筒状部分の方が前記後側の円筒状部分よりも軸方向へ短く形成されていることを特徴とする筆記具。 In a writing instrument comprising a shaft tube and an elastically deformable grip that is inserted into the tube shape so as to cover substantially the entire axial length of the shaft tube ,
The grip includes a raised portion formed over the entire circumference on the outer circumferential surface in the substantially axial direction , a front inclined curved surface portion that is smoothly and continuously reduced in diameter toward the front of the raised portion, and a height of the raised portion. A rear-side inclined curved surface portion that is continuously and smoothly reduced in diameter to the rear, a front-side cylindrical portion that is connected to a front end of the front-side inclined curved surface portion and extends forward, and the rear-side inclined curved surface A rear cylindrical part connected to the rear end of the part and extending backward,
The raised portion is formed on an inclined surface that slightly increases in diameter linearly as it goes forward, and connects the front inclined curved surface portion to the front end of the inclined surface and the rear end on the rear end of the inclined surface. By connecting the inclined curved part on the side, the diameter is expanded to a substantially trapezoidal longitudinal section,
The axial length of the front inclined curved surface portion, the raised portion and the rear inclined curved surface portion is longer than the axial length of the front cylindrical portion and the rear cylindrical portion combined. Is also set larger,
The front cylindrical portion and the rear cylindrical portion have substantially the same diameter, and the front cylindrical portion is formed shorter in the axial direction than the rear cylindrical portion. Writing instrument characterized by that.

使用者に握られて手指の親指から人差し指と中指の指先部分が前記グリップの表面に接触した際に、使用者の親指から人差し指へ至る略Ｕ字型の指間皮膚表面が、前記グリップの表面に対し隙間なく嵌り合うようにしたことを特徴とする請求項１記載の筆記具。 When the index finger and the middle fingertip part from the thumb of the finger are in contact with the grip surface when gripped by the user, the substantially U-shaped inter-finger skin surface from the user's thumb to the index finger is the surface of the grip. The writing instrument according to claim 1, wherein the writing instrument is fitted with no gap .

前記軸筒の外周面には、前記グリップの内周面と軸方向及び周方向へ移動不能に係合するズレ止め用突起が設けられ、
前記ズレ止め用突起は、前記軸筒の軸方向へ延びる縦突起と、前記軸筒の周方向へ延びる環状突起とを備え、前記縦突起の前と後に適宜寸法の隙間を置いて、前記環状突起を一対に配設してなることを特徴とする請求項１又は２記載の筆記具。 On the outer peripheral surface of the shaft cylinder, a protrusion for preventing slippage is provided which engages with the inner peripheral surface of the grip so as to be immovable in the axial direction and the circumferential direction
The misalignment preventing projection includes a vertical projection extending in the axial direction of the shaft cylinder and an annular projection extending in the circumferential direction of the shaft cylinder. The writing instrument according to claim 1 or 2 , wherein a pair of protrusions are provided.

前記グリップを発泡体とし、前記隙間を約５ｍｍ以上としたことを特徴とする請求項３記載の筆記具。 4. The writing instrument according to claim 3, wherein the grip is made of foam and the gap is about 5 mm or more .

前記発泡体には、独立気泡構造の発泡体であって、表面硬度が１５〜３０度、反発弾性が１５％以下、見かけ密度が０．０８〜０．１７g/cm ³ のものを使用することを特徴とする請求項４記載の筆記具。 Wherein the foam is a foam of closed cell structure, the surface hardness of 15 to 30 degrees, an impact resilience of 15% or less, the apparent density using those 0.08~0.17g / cm ³ The writing instrument according to claim 4.

前記グリップの後端部に係止バンドを巻き付けることで、該グリップ後端部を圧縮変形して、軸筒に対し軸方向及び周方向へ移動不能に係止し、
前記係止バンドの内周に係止凸部を突設し、この係止凸部と、軸筒に形成される凹部とを軸筒の径方向へ嵌合させたことを特徴とする請求項１乃至５何れか１項記載の筆記具。 By wrapping a locking band around the rear end portion of the grip, the grip rear end portion is compressed and deformed, and is locked so as to be immovable in the axial direction and the circumferential direction with respect to the axial tube.
A locking projection is provided on the inner periphery of the locking band, and the locking projection and a recess formed in the shaft tube are fitted in the radial direction of the shaft tube. The writing instrument according to any one of 1 to 5.