JP4812193B2

JP4812193B2 - Writing instrument

Info

Publication number: JP4812193B2
Application number: JP2001233395A
Authority: JP
Inventors: 茂樹大場; 昌紀土倉
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 2001-08-01
Filing date: 2001-08-01
Publication date: 2011-11-09
Anticipated expiration: 2021-08-01
Also published as: JP2003039878A

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil which is simply structured and designed so that the barrel is hardly slippery and can be easily gripped with such a convenience that the easy dividing and fastening of the barrel is achieved. SOLUTION: This writing utensil is of such a construction that an ink reservoir 7 which houses an intermediate cotton 6 filled with ink, is formed inside the barrel 2 and a part of the barrel 2 is screwed in a divisible manner and further, the divided part 5 forms an aperture of the reservoir 7 and that the barrel 2 is divided to enable supplying ink to the intermediate cotton 6 inside the reservoir 7 and also replacing the intermediate cotton 6. In this writing utensil, the outer peripheral part of a thinner side barrel 3 constituting the barrel 2 is wrapped with a grip part 11 made of an elastic material.

Description

【０００１】
【発明の属する技術分野】
本発明は、筆記具の構造に関し、特に、軸筒を分割して軸筒内に収容される中綿を交換したり、中綿にインクを補充するタイプの筆記具に関するものである。
【０００２】
【従来の技術】
従来、筆記具において、インクを保有するためにインクが含浸された中綿を軸筒内に収容した中綿式筆記具が多く用いられている。
このような中綿式筆記具においては、中綿を密閉するために先軸を軸筒に固定する方式として、ネジ嵌合を利用することはすでに知られている。
また、近年、一本の筆記具の両端部にペン先を備え、一方を太書き用として他方を細書き用とした、いわゆる両頭式の筆記具も多く用いられているが、このような両頭式の筆記具においても、ネジ嵌合で先軸を軸筒に固定する方式は、従来から行なわれていた。
このような中綿式筆記具において、インクが消耗した場合には中綿を交換したり、インクを補充することで、筆記具本体を引き続き再使用するものが知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、軸筒の一部を分割して、その分割部を螺合締結することで、中綿交換時やインク補充時の際に軸筒を分割可能とした中綿式筆記具においては、軸筒の分割時や締結時にネジ部を回すためには力が必要であり、軸筒を握る力が弱い者にとっては、この軸筒の分割、締結作業が困難な場合があった。
そこで、軸筒を握りやすくするために、凹凸部を有するローレット状のものを軸筒外周に形成したものが知られているが、通常のＰＰ等の樹脂材では滑り易く効果的ではなかった。
【０００４】
本発明は、上記従来の問題点に鑑みてなされたものであり、簡単な構造で軸筒を滑り難く、握り易くして、容易に軸筒の分割、締結を行なうことができる筆記具を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
本発明は、筆記具に係り、両端部に大小のペン芯を備え、軸筒内部にインクが充填された中綿を収容する収容部を形成し、前記軸筒の一部が分割可能に螺合されるとともに、その分割部が前記収容部の開口部を形成し、前記軸筒を分割して収容部内の中綿へのインクの補充や中綿の交換を可能とした筆記具において、
分割された軸筒のうちの一方側の軸筒が他方側の軸筒よりも短くかつ分割端部の外周に雄ネジが形成され、他方側の軸筒の分割端部の内周に雌ネジが形成されていて、各軸筒内部の収容部空間内に中綿を収容した状態で該雄ネジを雌ネジに螺合させて分割された軸筒同士を着脱可能に螺合させ、
一方側および他方側の軸筒端部に備えたペン芯を覆う各キャップの外径について、一方側の軸筒に設けたキャップの外径よりも、他方側の軸筒に設けたキャップの外径が大径に形成されており、
前記分割された軸筒のうちの少なくとも一方側の外周部をショアＡ硬度２０〜６０の弾性体で被覆することを特徴とする。
【０００６】
また、前記弾性体は、分割された軸筒のうちの短い一方側の軸筒の外周部に取付けられることが好ましい。
また、前記弾性体は、軸筒の成形時に該軸筒の樹脂成形品と一体成形すること、すなわち、グリップ部とネジを成形する成形品を一体に成形することが好ましい。
また、前記弾性体は、材質にゴムまたはエラストマを含むものであって、例えば、ＮＢＲ、ＥＰＤＭ、シリコンゴム等の成形品や、オレフィン系エラストマやスチレン系のエラストマ等の成形品とすることが好ましい。
また、前記弾性体は、架橋状態が７０％以上であるオレフィン系エラストマとすることが好ましい。
【０００７】
本発明によれば、以下のような作用が得られる。
すなわち、軸筒内部にインクが充填された中綿を収容する収容部を形成し、前記軸筒の一部が分割可能に螺合されるとともに、その分割部が前記収容部の開口部を形成し、前記軸筒を分割して収容部内の中綿へのインクの補充や中綿の交換を可能とした筆記具において、軸筒を握る部分にゴム、エラストマ等の弾性体を設けることにより、滑り難く、握り易くすることができる。
【０００８】
また、前記筆記具は、通常使用時は筆記時に外れたり弛んだりすることが無いように、強く締結され、中綿を交換する時には小さい力で軸筒を分割できることが望ましい。そのため、軸筒の外周に弾性体を設けることで、軸筒を握りやすくして、回し易くすることで軸筒の分割、締結が容易にできる。
【０００９】
また、弾性体のグリップ部は、軸筒の両側端に設けることが軸筒を開閉する上で望ましいが、軸筒外周の印刷やデザインなどに規制されるため、一方側につける場所としては、軸分割した場合の短い軸筒側、すなわち、ネジ開閉時に長さが短く握り難く、軸に力を伝え難い側にグリップの弾性体を設けたほうが効果的である。
【００１０】
また、前記弾性体は、軸筒の成形時に同系統の樹脂を使用して一体形成することによりグリップとネジを成形する成形品を一体にし、グリップ感の向上を図るとともに、手で軸筒を回転させる際に、一部品になっているため、軸筒とグリップとが滑る恐れもなく、締結時に滑り難く締め易くなる。また、例えば、オレフィン系樹脂であるＰＰ、ＰＥにスチレン系またはオレフィン系のエラストマを組み合わせることにより、一体成形で接着力の効果が得られる。また、非オレフィン系においては、スチレン系またはエステル系において接着力が得られる。
【００１１】
また、前記弾性体は、架橋状態が７０％以上であるオレフィン系エラストマとすることで低圧縮永久歪、シール性、耐油性、耐化学薬品性、耐熱性に対して優れた性能を示す。
【００１２】
【発明の実施の形態】
以下、本発明の実施形態を、図面を参照して詳細に説明する。
図１、図２は発明を実施する形態の一例であって、図１は、本発明の実施形態に係る中綿式の筆記具の全体構成を示す側面断面図、図２は前記筆記具の軸筒の構成を示す側面図である。
【００１３】
本実施形態は、図１、図２に示すように、軸筒２の両端部に大小のペン芯８、９を備え、該軸筒２内部にインクが充填された中綿６を収容する収容部７を形成し、該軸筒２を２分割して収容部７内の中綿６へのインクの補充や中綿６の交換を可能とした２個のペン芯８、９を有するツインタイプの中綿式の筆記具１である。
【００１４】
前記軸筒２は、図２に示すように、一方端に略円形断面を有する先細状の細字用ペン芯８が取付けられる細側端部３ａを備えた細側軸筒３と、他方端に矩形状断面を有し先端部がくさび状の太字用ペン芯９が取付けられる太側端部４ａを備えた太側軸筒４とに軸心方向で分割されたものであって、螺合締結により着脱可能とされている。
【００１５】
前記細側軸筒３は、図２に示すように、細側端部３ａと反対側に胴部３ｂが形成されている。前記胴部３ｂは、後述する太側軸筒４の胴部４ｂよりも短く、略円筒形状を呈するとともに、前記細側端部３ａに近い一部が細側端部３ａに向かい先細のテーパ状に形成されている。
【００１６】
前記胴部３ｂの端部には、図１に示すように、太側軸筒４側と螺合締結するための雄ネジ部３ｃが突出形成され、また、その内部には中綿６の一部が収容される収容部３ｄが形成されている。前記収容部３ｄは、前記胴部３ｂ端部付近の開口３ｅの形状を中綿６の外形よりも大きく形成され、内部空間３ｆの形状を中綿の外形と略同寸法で形成されている。
【００１７】
前記胴部３ｂの外周部には、円筒状の端部付近から細側端部３ａの基部付近の全周に亘り、外周面より一段低く凹部３ｈが形成され、その凹部３ｈの円筒状外周部とテーパ状外周部を覆うように弾性体であるグリップ部１１が該胴部３ｂと一体的に形成されている。
【００１８】
前記グリップ部１１は、材質にオレフィン系樹脂であるＰＰ、ＰＥにスチレン系またはオレフィン系のエラストマを組み合わせたものであって、その硬度はショアＡ硬度２０〜６０の範囲としている。
【００１９】
前記太側軸筒４は、図２に示すように、太側端部４ａの反対側に胴部４ｂが形成されている。前記胴部４ｂは、略円筒形状を呈するとともに、図１に示すように、その端部の内周部には細側軸筒３側と螺合締結するための雌ネジ部４ｃが形成され、その内部には中綿６の一部が収容される収容部４ｄが形成されている。
【００２０】
前記収容部４ｄは、前記胴部４ｂの内部空間４ｆの形状を開口４ｅから太側端部４ａ付近までの形状を中綿６の外形よりも大きい筒状とし、前記太側端部４ａの内部空間４ｇの形状を中綿６の外形よりも狭い形状で、中綿６がきつい嵌合で装着されるように構成されている。
【００２１】
前記細字用ペン芯８および太字用ペン芯９は、図１に示すように、それぞれの端部が収容部７内で中綿６の両端部に各々嵌挿され、該中綿６に含浸されたインクが両端部より細字用ペン芯８および太字用ペン芯９に浸透してどちらのペン芯でも筆記可能となっている。
【００２２】
図１に示すように、細側端部３ａには、細字用ペン芯８を覆うように細側キャップ１３が着脱自在に装着され、太側端部４ａには、太字用ペン芯９を覆うように太側キャップ１４が着脱自在に装着されている。
前記細側キャップ１３は、その外径が太側キャップの外径よりも小さく形成されているので、両方のキャップ１３、１４を装着した状態であっても、一目でペン芯の太さが解かるようになっている。
【００２３】
次に、本実施形態の筆記具１による作用について説明する。
本実施形態に係る筆記具１は、インクの補充や中綿の交換を行なう場合、軸筒２を分割して軸筒２内の収容部７を開放した状態で行なう。
まず、図１に示すように、細側軸筒３と太側軸筒４の胴部３ｂ、４ｂを各々把持してネジ部が弛緩する方向に回転させる。
この時、胴部４ｂの長い太側軸筒４はしっかりと確実に把持することができる。一方、胴部３ｂの短い細側軸筒３は把持し辛い。しかしながら、胴部３ｂの外周に設けられたグリップ部１１により滑りにくくなっているので、把持範囲が少ない場合であっても容易に把持して回転させることができる。
【００２４】
また、前記筆記具１により筆記を行なう場合には、軸筒２の両端部に装着される細側キャップ１３または太側キャップ１４を外して大小何れかのペン芯８、９を出して行なう。
【００２５】
キャップを外す場合は、一方の手でキャップを把持し、他方の手で軸筒を把持して、双方を捻りまたは引き離す方向に力を加えてキャップと軸筒とを離脱させる操作となる。
【００２６】
ここで、キャップと軸筒との嵌合力は、通常、係合するキャップの内面と軸筒の外面との接触面積の大きさによる摩擦力に係る。したがって、細側キャップ１３と太側キャップ１４とを比較すると、接触する外周面積の小さい細側端部３ａと嵌合する細側キャップの方が、接触する外周面積の大きい太側軸端部と嵌合する太側キャップよりも嵌合力が小さいため、着脱し易いといえる。
【００２７】
本実施形態の筆記具１は、図１に示すように、軸筒２の分割部５を細側端部３ａ寄りに構成したので、嵌合力が大きい太側キャップ１４を着脱する場合は、軸筒２側を把持する際に太側軸筒４とともに分割部５を把持する（細側軸筒３も同時に把持する）ようになるので、分割部５のネジ部が弛むことを防止することができる。
【００２８】
一方、嵌合力の小さい細側キャップ１３を着脱する場合は、軸筒２側を把持する際に太側軸筒４とともに分割部５を把持しない（細側軸筒３を把持しない）状態であっても、太側キャップ１４を外す場合よりも力が掛からないために、分割部のネジ部が弛み難くなる。
【００２９】
以上のように構成したので、本実施形態の筆記具１によれば、細側軸筒３の胴部３ｂの外周部の全周に亘り外周面より一段低く凹部３ｈを形成し、その凹部３ｈにグリップ部１１を胴部３ｂと一体的に設けることで、細側軸筒３を把持する際に胴部３ｂとグリップ部１１とが滑ること無く、確実に細側軸筒３を把持することができるとともに、グリップ感の向上を図ることができる。
【００３０】
また、本実施形態によれば、前記グリップ部１１の材質を、オレフィン系樹脂であるＰＰ、ＰＥにスチレン系またはオレフィン系のエラストマを組み合わせたものとしたので、一体成形時の接着力を得ることができる。また、グリップ部１１の硬度をショアＡ硬度２０〜６０の範囲としたので、良好なグリップ感を実現できる。
【００３１】
また、本実施形態によれば、２種類のペン芯８、９を両端部に備えた軸筒２を、細いペン芯８を備えた細側軸筒３と、太いペン芯９を備えた太側軸筒４とに分割するとともに、細側軸筒３の胴部３ｂを太側軸筒４の胴部４ｂよりも短く構成したので、嵌合力が大きい太側キャップ１４を着脱する場合に、軸筒２側を把持する際に太側軸筒４とともに分割部５を把持するようになり、分割部５のネジ部が弛むことを防止することができる。また、嵌合力の小さい細側キャップ１３を着脱する場合には、軸筒２側を把持する際に太側軸筒４とともに分割部５を把持しない状態であっても、太側キャップ１４を外す場合よりも力が掛からないために、分割部のネジ部が弛み難くできる。
【００３２】
次に、本実施形態の変形例１について図面を参照して説明する。
変形例１の筆記具１００は、図３に示すように、前述した本実施形態に係る筆記具１と略同様な構成を有し、さらに、グリップ部１１１の外周部に溝部１１１ａを形成したものである。
すなわち、筆記具１００は、軸筒１０２を、一方端に略円形断面を有する先細状の細字用ペン芯８が取付けられる細側軸筒１０３と、他方端に矩形状断面を有し先端部がくさび状の太字用ペン芯９が取付けられる太側軸筒１０４とに軸心方向で分割したものであって、螺合締結により着脱可能に構成したものである。
【００３３】
前記細側軸筒１０３は、細側端部１０３ａと反対側に胴部１０３ｂが形成されている。前記胴部１０３ｂは、太側軸筒１０４の胴部１０４ｂよりも短く、略円筒形状を呈するとともに、前記細側端部１０３ａに近い一部が細側端部１０３ａに向かい先細のテーパ状に形成されている。
【００３４】
前記胴部１０３ｂの端部には、図３に示すように、太側軸筒１０４側と螺合締結するための雄ネジ部１０３ｃが突出形成され、また、その内部には中綿６の一部が収容される収容部１０３ｄが形成されている。前記収容部１０３ｄは、前記胴部１０３ｂ端部付近の開口１０３ｅの形状を中綿６の外形よりも大きく形成され、内部空間１０３ｆの形状を中綿６の外形と略同寸法で形成されている。
【００３５】
前記胴部１０３ｂの外周部には、円筒状の端部付近から細側端部１０３ａの基部付近の全周に亘り外周部とテーパ状外周部を覆うように弾性体であるグリップ部１１１が該胴部１０３ｂと一体的に設けられている。
【００３６】
前記グリップ部１１１は、材質にオレフィン系樹脂であるＰＰ、ＰＥにスチレン系またはオレフィン系のエラストマを組み合わせたものであって、その硬度はショアＡ硬度２０〜６０の範囲としている。該グリップ部１１１の円筒状に形成された外周面には、軸心方向に沿った方向に対して傾けた状態で、円周方向に沿って複数列の溝部１１１ａが形成されている。
【００３７】
前記太側軸筒１０４は、太側端部１０４ａの反対側に胴部１０４ｂが形成されている。前記胴部１０４ｂは、略円筒形状を呈するとともに、その端部の内周部には細側軸筒１０３側と螺合締結するための雌ネジ部１０４ｃが形成され、その内部には中綿６の一部が収容される収容部１０４ｄが形成されている。
前記収容部１０４ｄは、前記胴部１０４ｂの内部空間１０４ｆの形状を開口１０４ｅから太側端部１０４ａ付近までの形状を中綿６の外形よりも大きい筒状とし、前記太側端部１０４ａの内部空間（図示省略）の形状を中綿６の外形よりも狭い形状で、中綿６がきつい嵌合で装着されるように構成されている。
【００３８】
以上のように構成したので、変形例１の筆記具１００によると、グリップ部１１１の外周部に溝部１１１ａを形成したことにより、実施形態に係る筆記具１のグリップ部１１と比較して、さらに滑り難くなり、確実に把持することができる。
【００４７】
尚、本発明の筆記具の構成は、前述した図示例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、前記図示例においては、軸筒の何れか一方にグリップ部を設けているが、分割される両端部にグリップ部を設けるようにしたものであっても良い。
【００４９】
【発明の効果】
以上、説明したように本発明の請求項１〜５記載の筆記具によれば、簡単な構造で、軸筒を滑り難く握り易くして、容易に軸筒の分割、締結を行なうことができるという優れた効果を奏する。
詳しくは、軸筒を分割して収容部内の中綿へのインクの補充や中綿の交換を可能とした筆記具において、軸筒を握る部分にゴム、エラストマ等の弾性体のグリップ部を設けることにより、滑り難く、握り易くすることができる。また、弾性体のグリップ部は、分割した軸筒の短い軸筒側、すなわち、軸筒の分割時に長さが短く、握り難く、軸に力を伝え難い側に弾性体のグリップ部を設けたほうがより効果的である。
【００５０】
また、前記弾性体は、軸筒の成形時に同系統の樹脂を使用して軸筒と一体形成することにより、ネジ部が形成される成形品とグリップ部とを一体に構成して、グリップ感の向上を図るとともに、手で軸筒を回転させる際に、一部品になっているため軸筒とグリップとが滑る恐れもなく、締結時に滑り難く締め易くなる。
また、前記弾性体は、例えば、オレフィン系樹脂であるＰＰ、ＰＥにスチレン系またはオレフィン系のエラストマを組み合わせることにより、一体成形時に接着力の効果が得られる。また、非オレフィン系においては、スチレン系またはエステル系において接着力が得られる。さらに、前記弾性体の材質に、架橋状態が７０％以上であるオレフィン系エラストマを使用することで、低圧縮永久歪、シール性、耐油性、耐化学薬品性、耐熱性に対して優れた性能を示す。
【図面の簡単な説明】
【図１】本発明の実施形態に係る中綿式の筆記具の全体構成を示す側面断面図である。
【図２】前記筆記具の軸筒の構成を示す側面図である。
【図３】前記筆記具の変形例１の構成を示す側面断面図である。
【符号の説明】
１、１００筆記具
２、１０２軸筒
３、１０３細側軸筒
３ａ、１０３ａ細側端部
３ｂ、１０３ｂ胴部
３ｃ、１０３ｃ雄ネジ部
３ｅ、１０３ｅ開口
３ｄ、１０３ｄ収容部
３ｆ、１０３ｆ内部空間
３ｈ凹部
４、１０４太側軸筒
４ａ、１０４ａ太側端部
４ｂ、１０４ｂ胴部
４ｃ、１０４ｃ雌ネジ部
４ｄ、１０４ｄ収容部
４ｅ、１０４ｅ開口
４ｆ、１０４ｆ内部空間
４ｇ内部空間
５分割部
７収容部
８細字用ペン芯
９太字用ペン芯
１１、１１１グリップ部
１３細側キャップ
１４太側キャップ
１１１ａ溝部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument structure, and more particularly, to a writing instrument of a type that divides a shaft tube and replaces the padding accommodated in the shaft tube or refills the padding with ink.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a writing instrument, a batting type writing instrument in which a batting impregnated with ink in order to retain ink is accommodated in a shaft tube is often used.
In such a batting type writing instrument, it is already known to use screw fitting as a method for fixing the front shaft to the shaft cylinder in order to seal the batting.
In recent years, there are many so-called double-headed writing tools that are equipped with pen nibs at both ends of one writing tool, one for thick writing and the other for thin writing. Also in writing instruments, a method of fixing the tip shaft to the shaft cylinder by screw fitting has been conventionally performed.
In such a batting type writing instrument, when the ink is consumed, the writing utensil body is continuously reused by replacing the batting or replenishing the ink.
[0003]
[Problems to be solved by the invention]
However, in the case of a batting type writing instrument that allows the shaft cylinder to be divided when the batting is replaced or when ink is replenished by dividing a part of the shaft cylinder and screwing and fastening the divided portion, A force is required to turn the screw portion at the time or at the time of fastening, and for those who have a weak force to grip the shaft tube, it may be difficult to divide and fasten the shaft tube.
Thus, in order to make it easier to grip the shaft tube, a knurled one having a concavo-convex portion is formed on the outer periphery of the shaft tube. However, ordinary resin materials such as PP are slippery and are not effective.
[0004]
The present invention has been made in view of the above-described conventional problems, and provides a writing instrument that can easily divide and fasten a shaft tube by making the shaft tube difficult to slide and easy to grip with a simple structure. It is for the purpose.
[0005]
[Means for Solving the Problems]
The present invention relates to a writing instrument, having a pen core at both ends, a housing portion for accommodating a filling filled with ink inside the shaft tube, and a part of the shaft tube being screwed so as to be split. In addition, in the writing instrument in which the divided portion forms the opening of the housing portion, the shaft tube is divided to replenish ink to the batting in the housing portion and replace the batting.
Of the divided shaft cylinders, one side cylinder is shorter than the other side cylinder, and a male screw is formed on the outer periphery of the divided end, and a female screw is formed on the inner circumference of the divided end of the other side cylinder. Are formed, and in the state where the batting is housed in the housing portion space inside each shaft tube, the male screw is screwed to the female screw and the divided shaft tubes are detachably screwed together,
About the outer diameter of each cap that covers the pen core provided at the end of the one side and the other side of the shaft cylinder, the outer diameter of the cap provided on the other side shaft cylinder is larger than the outer diameter of the cap provided on the one side cylinder. The diameter is formed into a large diameter,
Characterized by coating the outer peripheral portion of at least one side of the divided barrel an elastic material Shore A hardness 20-60.
[0006]
Moreover, it is preferable that the said elastic body is attached to the outer peripheral part of the short one side shaft cylinder among the divided shaft cylinders .
Further, it is preferable that the elastic body is integrally formed with a resin molded product of the shaft cylinder at the time of molding of the shaft cylinder, that is, a molded product for molding the grip portion and the screw is integrally formed.
The elastic body includes rubber or elastomer as a material, and is preferably a molded product such as NBR, EPDM, or silicon rubber, or a molded product such as olefin elastomer or styrene elastomer. .
The elastic body is preferably an olefin elastomer having a crosslinked state of 70% or more.
[0007]
According to the present invention, the following effects can be obtained.
That is, a housing portion for containing a filling filled with ink is formed inside the shaft tube, and a part of the shaft tube is screwed to be separable, and the divided portion forms an opening of the housing portion. In a writing instrument that can be refilled with ink and / or replaced with batting in the container by dividing the shaft tube, it is difficult to slip by providing an elastic body such as rubber or elastomer at the portion that grips the shaft tube. Can be made easier.
[0008]
Further, it is desirable that the writing instrument is strongly fastened so that it does not come off or loosen during writing during normal use, and the shaft tube can be divided with a small force when changing the batting. Therefore, by providing an elastic body on the outer periphery of the shaft tube, the shaft tube can be easily gripped, and by turning it easily, the shaft tube can be easily divided and fastened.
[0009]
In addition, it is desirable to provide the grip portion of the elastic body on both side ends of the shaft tube in order to open and close the shaft tube, but because it is restricted by printing or design on the outer periphery of the shaft tube, It is more effective to provide a grip elastic body on the side of the short shaft tube when the shaft is divided, that is, on the side where the length is short and difficult to grip when the screw is opened and closed and it is difficult to transmit force to the shaft.
[0010]
In addition, the elastic body is integrally formed using a resin of the same system at the time of molding of the shaft cylinder, so that a grip and a molded product for molding a screw are integrated to improve the grip feeling, and the shaft cylinder is manually formed. When rotating, since it is a single part, there is no fear of slipping between the shaft tube and the grip, and it is difficult to slip and fasten when fastened. Further, for example, by combining a styrene-based or olefin-based elastomer with PP or PE which is an olefin-based resin, an effect of adhesive force can be obtained by integral molding. In the case of non-olefin type, adhesive strength can be obtained in styrene type or ester type.
[0011]
The elastic body exhibits excellent performance with respect to low compression set, sealability, oil resistance, chemical resistance, and heat resistance by using an olefin elastomer having a crosslinked state of 70% or more.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 are examples of embodiments for carrying out the invention. FIG. 1 is a side sectional view showing the overall configuration of a batting type writing instrument according to an embodiment of the present invention, and FIG. 2 is a shaft cylinder of the writing instrument. It is a side view which shows a structure.
[0013]
In the present embodiment, as shown in FIGS. 1 and 2, a housing portion that includes large and small pen cores 8 and 9 at both ends of the shaft tube 2, and houses the filling 6 filled with ink in the shaft tube 2. A twin-type batting type having two pen cores 8 and 9 that can be refilled with ink to the batting 6 in the accommodating portion 7 and can be replaced. The writing instrument 1.
[0014]
As shown in FIG. 2, the shaft tube 2 includes a narrow side shaft tube 3 having a narrow side end portion 3a to which a tapered fine pen core 8 having a substantially circular cross section is attached at one end, and the other end. It is divided in the axial direction into a thick-side shaft cylinder 4 having a thick-side end portion 4a to which a thick-faced pen core 9 having a rectangular cross section and a wedge-shaped tip is attached, and is screwed and fastened Can be attached and detached.
[0015]
As shown in FIG. 2, the narrow side shaft cylinder 3 has a body portion 3b on the side opposite to the narrow side end portion 3a. The body portion 3b is shorter than a body portion 4b of the thick shaft cylinder 4 to be described later, has a substantially cylindrical shape, and a part close to the narrow side end portion 3a is tapered toward the narrow side end portion 3a. Is formed.
[0016]
As shown in FIG. 1, a male screw portion 3 c for screwing and fastening to the thick shaft tube 4 side is projected and formed at the end portion of the body portion 3 b, and a part of the batting 6 is formed therein. A housing part 3d for housing the is formed. The accommodating portion 3d is formed such that the shape of the opening 3e in the vicinity of the end portion of the trunk portion 3b is larger than the outer shape of the batting 6 and the shape of the internal space 3f is formed with substantially the same dimensions as the outer shape of the batting.
[0017]
A concave portion 3h is formed on the outer peripheral portion of the body portion 3b so as to be one step lower than the outer peripheral surface from the vicinity of the cylindrical end portion to the entire vicinity of the base portion of the narrow side end portion 3a, and the cylindrical outer peripheral portion of the concave portion 3h. A grip portion 11 that is an elastic body is formed integrally with the body portion 3b so as to cover the tapered outer peripheral portion.
[0018]
The grip portion 11 is made by combining PP or PE, which is an olefin resin, with a styrene-based or olefin-based elastomer, and has a Shore A hardness of 20-60.
[0019]
As shown in FIG. 2, the thick side cylinder 4 has a body part 4b on the opposite side of the thick side end part 4a. The body portion 4b has a substantially cylindrical shape, and as shown in FIG. 1, a female screw portion 4c for screwing and fastening to the narrow shaft tube 3 side is formed on the inner peripheral portion of the end portion thereof, A housing portion 4d for housing a part of the batting 6 is formed therein.
[0020]
The accommodating portion 4d has a shape of the internal space 4f of the trunk portion 4b in a cylindrical shape larger than the outer shape of the batting 6 from the opening 4e to the vicinity of the thick side end 4a, and the internal space of the thick side end 4a. The shape of 4g is narrower than the outer shape of the batting 6, and the batting 6 is configured to be attached by tight fitting.
[0021]
As shown in FIG. 1, the thin-color pen core 8 and the bold-color pen core 9 are respectively inserted into both end portions of the batting 6 in the accommodating portion 7, and the ink impregnated in the batting 6. Penetrating from both ends into the fine pen core 8 and the bold pen core 9, and writing is possible with either pen core.
[0022]
As shown in FIG. 1, a thin-side cap 13 is detachably attached to the thin-side end 3a so as to cover the thin-shaped pen core 8, and the thick-side end 4a covers the bold-type pen core 9. Thus, the thick side cap 14 is detachably attached.
Since the outer diameter of the narrow cap 13 is smaller than the outer diameter of the thick cap, the thickness of the pen core can be understood at a glance even when both caps 13 and 14 are attached. It comes to be able to do it.
[0023]
Next, the effect | action by the writing instrument 1 of this embodiment is demonstrated.
In the writing instrument 1 according to the present embodiment, when replenishing ink or replacing batting, the shaft cylinder 2 is divided and the accommodating portion 7 in the shaft cylinder 2 is opened.
First, as shown in FIG. 1, the body portions 3 b and 4 b of the narrow-side shaft tube 3 and the thick-side shaft tube 4 are respectively gripped and rotated in a direction in which the screw portion is relaxed.
At this time, the thick side barrel 4 having the long body portion 4b can be firmly and securely gripped. On the other hand, it is difficult to grip the narrow side cylinder 3 having the short body portion 3b. However, since the grip portion 11 provided on the outer periphery of the body portion 3b makes it difficult to slip, even if the gripping range is small, it can be easily gripped and rotated.
[0024]
Further, when writing with the writing instrument 1, the thin side cap 13 or the thick side cap 14 attached to both ends of the shaft tube 2 is removed and the pen cores 8 and 9 of either large or small are taken out.
[0025]
When removing the cap, the cap is grasped with one hand, the shaft cylinder is grasped with the other hand, and the cap and the shaft cylinder are detached by applying a force in the direction of twisting or pulling off both.
[0026]
Here, the fitting force between the cap and the shaft tube is usually related to a frictional force due to the size of the contact area between the inner surface of the engaging cap and the outer surface of the shaft tube. Therefore, when comparing the narrow cap 13 and the thick cap 14, the narrow cap fitted with the small end 3a having a smaller outer peripheral area in contact with the thick shaft end having a larger outer peripheral area in contact with the thin cap. Since the fitting force is smaller than that of the thick cap to be fitted, it can be said that it is easy to attach and detach.
[0027]
As shown in FIG. 1, the writing instrument 1 according to the present embodiment is configured so that the divided portion 5 of the shaft tube 2 is closer to the narrow side end portion 3a. When the two sides are gripped, the split portion 5 is gripped together with the thick side barrel 4 (the narrow side barrel 3 is also gripped simultaneously), so that the screw portion of the split portion 5 can be prevented from loosening. .
[0028]
On the other hand, when attaching and detaching the narrow cap 13 having a small fitting force, the split portion 5 is not gripped together with the thick shaft tube 4 (the thin shaft tube 3 is not gripped) when gripping the shaft tube 2 side. However, since force is not applied compared with the case where the thick side cap 14 is removed, the screw portion of the divided portion is less likely to loosen.
[0029]
Since it comprised as mentioned above, according to the writing instrument 1 of this embodiment, the recessed part 3h is formed one step lower than an outer peripheral surface over the perimeter of the outer peripheral part of the trunk | drum 3b of the thin side cylinder 3, and the recessed part 3h By providing the grip portion 11 integrally with the body portion 3b, the body portion 3b and the grip portion 11 do not slip when the thin side shaft tube 3 is gripped, so that the narrow side shaft tube 3 can be securely gripped. In addition, the grip feeling can be improved.
[0030]
Further, according to the present embodiment, since the material of the grip portion 11 is a combination of olefin resin such as PP and PE combined with styrene or olefin elastomer, an adhesive force during integral molding can be obtained. Can do. Moreover, since the hardness of the grip part 11 was made into the range of Shore A hardness 20-60, a favorable grip feeling is realizable.
[0031]
Further, according to the present embodiment, the shaft cylinder 2 provided with two types of pen cores 8 and 9 at both ends, the thin side cylinder 3 provided with the thin pen core 8, and the thick cylinder provided with the thick pen core 9. Since the body portion 3b of the narrow side shaft tube 3 is configured to be shorter than the body portion 4b of the thick side shaft tube 4 while being divided into the side shaft tube 4, when the thick side cap 14 having a large fitting force is attached and detached, When gripping the shaft tube 2 side, the split portion 5 is gripped together with the thick shaft tube 4, and the screw portion of the split portion 5 can be prevented from loosening. Further, when the thin cap 13 having a small fitting force is attached / detached, the thick cap 14 is removed even when the split portion 5 is not gripped together with the thick shaft 4 when gripping the shaft barrel 2 side. Since a force is not applied as compared with the case, the screw portion of the divided portion can be made difficult to loosen.
[0032]
Next, Modification 1 of the present embodiment will be described with reference to the drawings.
As shown in FIG. 3, the writing instrument 100 of Modification 1 has a configuration substantially similar to that of the writing instrument 1 according to the present embodiment described above, and further has a groove 111 a formed on the outer periphery of the grip 111. .
That is, the writing instrument 100 includes a shaft tube 102, a narrow side shaft tube 103 to which a tapered fine pen core 8 having a substantially circular cross section is attached at one end, and a rectangular cross section at the other end and a tip portion wedged. It is divided in the axial direction into a thick side cylinder 104 to which a thick bold pen core 9 is attached, and is configured to be detachable by screwing fastening.
[0033]
The narrow side shaft tube 103 has a body portion 103b on the opposite side to the narrow side end portion 103a. The barrel 103b is shorter than the barrel 104b of the thick-side shaft tube 104, has a substantially cylindrical shape, and a part close to the narrow-side end 103a is tapered toward the narrow-side end 103a. Has been.
[0034]
As shown in FIG. 3, a male screw portion 103c for screwing and fastening to the thick shaft tube 104 side is projected and formed at the end portion of the body portion 103b. A housing portion 103d is formed. The housing portion 103d is formed such that the opening 103e near the end of the body portion 103b is larger than the outer shape of the batting 6 and the shape of the internal space 103f is approximately the same size as the outer shape of the batting 6.
[0035]
On the outer periphery of the body 103b, there is a grip portion 111 that is an elastic body so as to cover the outer periphery and the tapered outer periphery from the vicinity of the cylindrical end to the entire periphery near the base of the narrow side end 103a. It is provided integrally with the trunk 103b.
[0036]
The grip part 111 is made by combining PP or PE, which is an olefin resin, with a styrene or olefin elastomer, and has a hardness in the range of Shore A hardness 20-60. A plurality of rows of groove portions 111a are formed along the circumferential direction on the outer peripheral surface of the grip portion 111 formed in a cylindrical shape in a state of being inclined with respect to the direction along the axial direction.
[0037]
The thick barrel 104 has a body 104b on the opposite side of the thick end 104a. The body portion 104b has a substantially cylindrical shape, and an internal thread portion 104c for screwing and fastening to the narrow shaft tube 103 side is formed on the inner peripheral portion of the end portion thereof, and the inside of the batting 6 is formed therein. A housing portion 104d for housing a part is formed.
The accommodating portion 104d has a shape of the internal space 104f of the trunk portion 104b in a cylindrical shape larger than the outer shape of the batting 6 from the opening 104e to the vicinity of the thick end 104a, and the internal space of the thick end 104a. The shape (not shown) is narrower than the outer shape of the batting 6, and the batting 6 is configured to be attached by tight fitting.
[0038]
Since it comprised as mentioned above, according to the writing instrument 100 of the modification 1, by forming the groove part 111a in the outer peripheral part of the grip part 111, compared with the grip part 11 of the writing instrument 1 which concerns on embodiment, it is further difficult to slip. Therefore, it can be securely gripped.
[0047]
Note that the configuration of the writing instrument of the present invention is not limited to the illustrated example described above, and various modifications can be made without departing from the scope of the present invention. For example, in the illustrated example, the grip portion is provided on one of the shaft cylinders, but the grip portion may be provided on both end portions to be divided.
[0049]
【The invention's effect】
As described above, according to the writing instrument according to claims 1 to 5 of the present invention, it is possible to easily divide and fasten the shaft tube with a simple structure, making the shaft tube difficult to slip and easy to grip. Excellent effect.
Specifically, in a writing instrument that can be refilled with ink to the batting in the housing part and replace the batting by dividing the shaft tube, by providing a grip portion of an elastic body such as rubber, elastomer, etc. on the portion that grips the shaft tube, It is hard to slip and can be easily gripped. Further, the grip portion of the elastic body is provided with the grip portion of the elastic body on the short shaft tube side of the divided shaft tube, that is, on the side where the length is short when the shaft tube is divided, it is difficult to grasp and the force is not easily transmitted to the shaft. Is more effective.
[0050]
Further, the elastic body is integrally formed with the shaft cylinder using the same type of resin at the time of molding the shaft cylinder, thereby integrally forming a molded product on which the thread portion is formed and the grip section. When the shaft cylinder is rotated by hand, since it is a single component, there is no fear of slipping between the shaft cylinder and the grip, and it is difficult to slip and fasten when fastened.
In addition, the elastic body can obtain an effect of adhesive force during integral molding by combining, for example, PP or PE, which is an olefin resin, with a styrene or olefin elastomer. In the case of non-olefin type, adhesive strength can be obtained in styrene type or ester type. Furthermore, the use of an olefin-based elastomer having a cross-linked state of 70% or more as the material of the elastic body provides excellent performance with respect to low compression set, sealability, oil resistance, chemical resistance, and heat resistance. Indicates.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an overall configuration of a batting type writing instrument according to an embodiment of the present invention.
FIG. 2 is a side view showing a configuration of a shaft cylinder of the writing instrument.
FIG. 3 is a side cross-sectional view showing a configuration of Modification 1 of the writing instrument .
[Explanation of symbols]
1,100 Writing instrument
2, 102 Axle tube 3, 103 Narrow side shaft tube 3a, 103a Narrow side end
3b, 103b trunk
3c, 103c Male thread
3e, 103e opening
3d, 103d housing
3f, 103f Internal space 3h Recess 4, 104 Thick side cylinder 4a, 104a Thick end 4b, 104b Body 4c, 104c Female thread 4d, 104d Housing 4e, 104e Opening 4f, 104f Internal space 4g Internal space 5 Dividing part 7 accommodating part 8 Pen core for fine character 9 Pen core for bold character
11, 111 Grip part 13 Narrow side cap 14 Thick side cap 111a Groove part

Claims

Both end portions are provided with large and small pen cores, and a housing portion is formed in the shaft tube to store the filling filled with ink. A part of the shaft tube is screwed so as to be split, and the divided portion is In the writing instrument that forms the opening of the storage part, divides the shaft cylinder, and enables refilling of the cotton in the storage part and replacement of the cotton pad,
Of the divided shaft cylinders, one side cylinder is shorter than the other side cylinder, and a male screw is formed on the outer periphery of the divided end, and a female screw is formed on the inner circumference of the divided end of the other side cylinder. Are formed, and in the state where the batting is housed in the housing portion space inside each shaft tube, the male screw is screwed to the female screw and the divided shaft tubes are detachably screwed together,
About the outer diameter of each cap that covers the pen core provided at the end of the one side and the other side of the shaft cylinder, the outer diameter of the cap provided on the other side shaft cylinder is larger than the outer diameter of the cap provided on the one side cylinder. The diameter is formed into a large diameter,
A writing instrument, wherein an outer peripheral portion of at least one side of the divided cylinders is covered with an elastic body having a Shore A hardness of 20 to 60 .

2. The writing instrument according to claim 1, wherein the elastic body is attached to an outer peripheral portion of a short one of the divided shaft cylinders.

The writing instrument according to claim 1, wherein the elastic body is integrally formed with a resin molded product of the shaft cylinder when the shaft cylinder is molded.

The writing instrument according to claim 1, wherein the elastic body includes rubber or elastomer as a material.

The writing instrument according to any one of claims 1 to 3, wherein the elastic body is an olefin elastomer having a crosslinked state of 70% or more.