JP4093650B2

JP4093650B2 - Knock-type writing instrument

Info

Publication number: JP4093650B2
Application number: JP26725698A
Authority: JP
Inventors: 幹也井戸
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 1998-09-04
Filing date: 1998-09-04
Publication date: 2008-06-04
Anticipated expiration: 2018-09-04
Also published as: JP2000079789A

Description

【０００１】
【発明の属する技術分野】
本発明はノック式筆記具に関する。詳細には、ノック操作によってレフィルのペン先を軸筒先端より突出させるとともに、万一、筆記具をペン先突出状態でポケット等に差し入れたとしても、係合状態を解除してペン先を軸筒内に没入させ、衣服等を汚すことを防止するクリップセーフティ機構を備えたノック式筆記具に関する。
【０００２】
尚、本発明で「前」とはペン先側を指し、「後」とはノック操作側を指す。
【０００３】
【従来の技術】
従来、実公昭６３−３１９８７号公報には、「軸筒後端に押圧子を有し、軸筒内に前後動自在に嵌挿された筆記体（本願のレフィルに相当）を該押圧子に付勢する如くなしたノック式筆記具に於てクリップ先端に係止孔４ａ（本願の係止段部に相当）を設け、該係止孔に対向した位置の軸筒に孔を設け、前記押圧子と連動する係合部２ｂ’（本願の係止突起に相当）を該孔から突出させ前記クリップの係止孔４ａに係脱することを特徴とするノック式筆記具の筆記体出入装置。」が開示されている。（図９参照）
【０００４】
【発明が解決しようとする課題】
前記従来の筆記具は、図９に示すように、係止突起２ｂ’の係合面が、クリップの係止段部４ａと確実な係合をなすように垂直面形状（又は鉤形状）となっている。そのため、縫製の被挟持体９（例えば、衣服等の布製のポケット、又はバインダー手帳等の皮革製の挿入用リング等）に差し入れた後、筆記具を被挟持体９から抜き取る際、係止突起を被挟持体９の端縁の折り返し部９１（縫合箇所）に引っ掛けやすく、それにより、前記折り返し部９１を損傷させるおそれがある。
【０００５】
本発明は前記従来の問題点を解決するものであって、衣服等の縫合された折り返し部を有する被挟持体に差した後、該被挟持体から筆記具を抜き取る際、係止突起が被挟持体端縁の折り返し部（縫合箇所）に引っ掛かることがなく、スムーズに抜き取ることができ、その結果、被挟持体の損傷が回避されるノック式筆記具を提供しようとするものである。
【０００６】
【課題を解決するための手段】
［１］本発明は、軸筒２後端より突出するノック棒７を軸方向前方に押圧操作した際、軸筒２の外面より径方向外方に突出した係止突起５１が、レフィル３の前方移動と共に前方移動してクリップ４前端内面の係止段部４２に係合し、一方、クリップ４を持ち上げた際、前記係合状態が解除され、レフィル３の後方移動と共に前記係止突起５１が後方移動するクリップセーフティ機構を有するノック式筆記具１であって、前記係止突起５１の後方に、径方向外方に突出するガイド突起５２を設け、前記ガイド突起５２を前記係止突起５１と一定間隔を維持して前後方向に移動可能（連動可能）にし、クリップ４前端内面に、径方向内方に突出し且つ係止段部４２を備える挟持突起４１を設け、前記係止段部４２と前記係止突起５１とが係合状態の際、前記ガイド突起５２前面と前記挟持突起４１後面が近接してなること（請求項１）を要件とする。（図３及び図６参照）
【０００７】
（作用）
係止突起５１の後方に位置するガイド突起５２によって、被挟持体９の折り返し部９１の前端部が係止突起５１の後面に引っ掛かることを抑止する。さらに、前記ガイド突起５２と前記係止突起５１とが一定間隔を維持して連動する構成のため、前記係止突起５１の後方には、常に一定間隔をおいて前記ガイド突起５２が位置している。したがって、前記係止突起５１と前記ガイド突起５２との間の距離が広がることがないので、前記係止突起５１と前記ガイド突起５２との間に被挟持体９の折り返し部９１が入り込み難く、折り返し部９１の前端部が係止突起５１に引っ掛かることを、より一層回避できる。（図２参照）
前記ガイド突起５２前面と前記挟持突起４１後面を近接させることによって、ガイド突起５２後面と係止突起５１前面との間隙をできる限り小さくし、より一層、被挟持体９の端縁の折り返し部９１が、前記係止突起５１と前記ガイド突起５２との間に入り込み難く、前記ガイド突起５２後面から前記係止突起５１前面へ前記係止突起５１後面を飛び越えて滑らかに移動でき、折り返し部９１の前端部が前記係止突起５１に引っかかることを、より一層、回避する。
また、前記ガイド突起５２前面と係止突起５１後面との間の間隙Ｌ（長手方向の最大寸法）は、１ｍｍ〜５ｍｍの範囲が好ましい。なぜなら、もし、前記間隙が１ｍｍより小さい場合、係止突起５１と係止段部４２との係合が不安定となり、一方、もし、前記間隙が５ｍｍより大きい場合、被挟持体９の折り返し部９１に対する引っ掛かり抑止作用が不十分となるからである。
また、前記ガイド突起５２の後面は、傾斜面又は曲面であることが好ましい。それにより、ガイド突起５２と被挟持体９の端縁の折り返し部９１の前端部との引っ掛かりを、より一層抑止できる。
【０００８】
［２］前記請求項１のノック式筆記具１において、前記ガイド突起５２が、前記係止突起５１よりも径方向外方に大きく突出してなること（請求項２）が好ましい。
【０００９】
（作用）
前記ガイド突起５２は、前記係止突起５１の後方に位置し、かつ、前記係止突起５１よりも径方向外方に大きく突出している。そのため、クリップ４を衣服等の縫合された折り返し部９１を有する被挟持体９に差した後、該被挟持体９から筆記具１を抜き取る際、前記ガイド突起５２によって係止突起５１が被挟持体９端縁の折り返し部９１（詳細には折り返し部９１の前端部）に引っ掛かることを抑え、より一層、筆記具１をスムーズに抜き取ることができる。（図２参照）
【００１０】
【００１１】
【００１２】
【００１３】
【００１４】
【発明の実施の形態】
本発明の実施の形態を図面に従って説明する。
【００１５】
図１〜図８に本発明の一実施例を示す。本実施例のノック式筆記具１は、軸筒２と、該軸筒２内に収容されたレフィル３と、該レフィル３のペン先３１を軸筒２の先端孔２２（具体的には、軸筒２前端に螺合により取り外し自在の先体２１の先端孔２２）より出没自在にさせる出没機構とを備える。また、前記出没機構は、筆記具１のクリップ４をペン先突出状態でポケット等に差し入れた際に、ペン先突出状態を解除してペン先３１を軸筒２内に没入させるクリップセーフティ機構を有する。
【００１６】
（出没機構）
前記出没機構は、回転カム機構を用いたノック式出没機構であり、軸筒２内に配置された円筒状のカム筒５と、該カム筒５のカム部と係合し且つレフィル３後端と当接する回転子６と、該回転子６と係合し且つ軸筒２後端より突出するノック棒７と、軸筒２内に収容され且つレフィル３を後方へ付勢する弾発体８（例えば、コイルスプリング）とからなる。また、前記出没機構は、ペン先突出操作、及びペン先没入操作の両操作が、ノック棒７を前方へ押圧するダブルノック式である。
【００１７】
（セーフティ機構）
前記セーフティ機構は、軸筒２外面より突出する係止突起５１を外面に備えたカム筒５と、前記係止突起５１と係合する係止段部４２を内面に備えたクリップ４とからなる。前記カム筒５は、軸筒２内に前後動自在に収容されている。また、前記クリップ４は、軸筒２外面に固定されている。
【００１８】
（クリップ）
前記クリップ４は、具体的には、合成樹脂の射出成形により得られ、軸筒２外面より一体に突出している。前記クリップ４の前端近傍内面には、挟持突起４１が一体に設けられる。前記挟持突起４１は、前面及び後面が曲面状となっていると共に、その前部内面に係止段部４２が形成されている。
【００１９】
（カム筒）
前記カム筒５は、円筒体であり、前進後退可能なよう軸筒２内に摺動可能に収容される。前記カム筒５の外面には、係止突起５１及びガイド突起５２が一体に設けられる。また、前記クリップ４の径方向内面と対峙する軸筒２側壁にはスライド孔２３が貫設され、前記スライド孔２３を通して、前記係止突起５１及び前記ガイド突起５２が軸筒２内面から軸筒２外面に摺動可能に突出している。
【００２０】
前記係止突起５１は、鉤形状であり、クリップ４の係止段部４２と係合可能である。また、前記ガイド突起５２は、前記係止突起５１の後方に位置し、前記係止突起５１より径方向外方に大きく突出し、前面及び後面に傾斜面、頂部に曲面を備えた山形状である。
【００２１】
（セーフティ機構の作用）
図３又は図６に示すように、通常の筆記使用時（即ち、セーフティ機構の非作動状態）、カム筒５の係止突起５１と、クリップ４の係止段部４２とが係合している。この時、ガイド突起５２前面と挟持突起４１後面が近接している。
【００２２】
そして、図３又は図６の状態から、被挟持体９に筆記具１のクリップ４を差した際、クリップ４が径方向外方に持ち上げられることによりセーフティ機構が作動し、前記係止突起５１と前記係止段部４２の係合が解除され、弾発体８の後方付勢によるカム筒５の後方移動に伴い、係止突起５１及びガイド突起５２がスライド孔２３内面に沿って後方に移動する。その結果、ペン先３１が軸筒２内に没入される。
【００２３】
（ガイド突起の作用）
縫合された被挟持体９の端縁の内側に折り返し部９１が存在する場合、図２に示すように、筆記具１のクリップ４をポケットに差し入れたとしても、筆記具１を被挟持体９から抜き取る際に、前記折り返し部９１の前端部は、ガイド部の後面と滑らかに前方に摺動し、係止突起５１の後面に引っ掛かることなしに、筆記具１を円滑に被挟持体９から抜き取ることができる。
【００２４】
また、クリップ４内面と挟持突起４１の後面の境目には、凹曲面４３が設けられる。これにより、もし、図２（内面に折り返し部９１を有する被挟持体）とは逆に、外面に折り返し部９１を有する被挟持体９に差し入れた場合、挟持突起４１後面に、折り返し部９１の前端部が引っ掛かることがなく、筆記具１をスムーズに抜き去ることができる。
【００２５】
（カム筒）
図７及び図５に示すように、前記カム筒５は、その内面に、前記回転子６が係合するカム部を備える。前記カム部は、前方へ突出する鋸歯状の複数のカム歯５３と、該カム歯５３間に形成した３本の縦溝５４とからなる。
【００２６】
（回転子）
図８（ｂ）に示すように、前記回転子６は、その外面に長手方向に延びる３本の突条６１を備え、前記突条６１の傾斜面状の後端部６１ａが、前記カム筒５のカム歯５３と係合されると共に、前記突条６１の長手方向に延びる側面部６１ｂが、前記カム筒５の縦溝５４と係合する。また、前記回転子６は、軸筒２内の弾発体８により、レフィル３と共に後方に付勢されている。また、前記突条６１の後端部６１ａより後方には、小径部６２が設けられ、該小径部６２がノック棒７内に遊挿されている。
【００２７】
（ノック棒）
図８（ａ）及び図２に示すように、前記ノック棒７は、有底筒状体であり、前端に鋸歯状の複数のカム歯７１を備える。前記カム歯７１は、少なくとも、ノック操作時、前記回転子６の突条６１の傾斜面状の後端部６１ａと係合可能である。
【００２８】
（出没機構の作用）
・突出操作
ペン先３１を没入状態（図６）から突出状態（図３）にする際、軸筒２後端より突出のノック棒７の後端部を前方へ押圧操作する。このとき、ノック棒７前端のカム歯７１と、レフィル３後端に当接する回転子６に形成した突条６１の傾斜面状の後端部６１ａとが係合する。そのため、前記押圧操作と同時に、前記回転子６が、その突条６１の側面部６１ｂをカム筒５の縦溝５４内を摺動させながら、前方に移動される。その後、前記突条６１が前記縦溝５４から前方に抜け出し、前記回転子６が回転方向にフリーとなる。この時、ノック棒７のカム歯７１と回転子６の後端部６１ａとの係合によって、回転子６が回転方向に僅かに送られるため、突条６１の後端部６１ａがカム筒５のカム歯５３と係止される。前記回転子６の前方移動に伴って、レフィル３が、弾発体８の前方付勢に抗して前方に押圧され、軸筒２の先端孔２２から前方にペン先３１が突出される。前記突条６１の後端部６１ａとカム筒５のカム歯５３との係止によって、ペン先突出状態が維持される。
【００２９】
・没入操作
ペン先３１を突出状態（図３）から没入状態（図６）にする際、前記突出操作同様、軸筒２後端より突出のノック棒７の後端部を前方へ押圧操作する。このとき、ノック棒７の前端のカム歯７１と、レフィル３後端に当接する回転子６に形成した突条６１の傾斜面状の後端部６１ａとが係合する。そのため、前記押圧操作と同時に、回転子６が回転方向に僅かに送られ、突条６１の後端部６１ａとカム筒５のカム歯５３との係合が解除される。前記回転子６は、レフィル３を介して弾発体８により後方へ付勢されているため、前記突条６１の後端部６１ａとカム筒５のカム歯５３との係合解除と同時に、突条６１の縦溝５４に沿った後方移動に伴い、回転子６が後方に移動される。即ち、レフィル３が後方に移動され、先端孔２２より前方に突出していたペン先３１が軸筒２内に没入される。
【００３０】
（レフィル）
前記レフィル３は、先端にボールペンペン先（例えば、先端に外径０．３ｍｍのボールを抱持したボールペンチップ）を備え、内部に油性インキ又は水性インキと、該インキの消費に従って前進する追従体（例えば、シリコンオイル等の高粘度流体）とを収容したボールペンカートリッジである。前記レフィル３は、軸筒２前端に螺着された先体２１（前端に先端孔２２を有する先細状筒体）を取り外すことにより、軸筒２内から取り出して交換可能である。また、前記先体２１の内面の段部が、前記レフィル３を前方付勢する弾発体８を保持している。
【００３１】
尚、本発明において、前記係止突起５１の後面は、鉤形状の他にも、例えば、垂直面形状でもよい。
【００３２】
尚、本発明において、前記係止段部４２は、挟持突起４１に設ける構成の他にも、例えば、クリップ４内面に単に凹みや孔を設けた構成でもよい。
【００３３】
尚、本発明において、ペン先３１は、ボールペンペン体の他にも、繊維ペン体、多孔質ペン体、軸方向のインキ導出路を備えたプラスチック押出成形製ペン体、細管ペン体、先端に切り割りを有する板状ペン体（いわゆる万年筆のペン先）、シャープペンシル等、いずれであってもよい。
【００３４】
尚、本発明において、前記クリップ４の材質は、合成樹脂製の他、金属製でもよい。また、クリップ４は、軸筒２と一体に形成してもよいが、軸筒２と独立した別部材の取り付けにより形成してもよい。
【００３５】
【発明の効果】
本発明ノック式筆記具は、前記請求項１の構成により、縫合された折り返し部を有する被挟持体に差し入れた後、該被挟持体から筆記具を抜き取る場合、ガイド突起によって、係止突起が被挟持体の折り返し部に引っ掛かからず、スムーズに被挟持体から筆記具を抜き取ることができ、被挟持体を損傷することが回避できる。本発明ノック式筆記具は、前記請求項１の構成により、ガイド突起と被挟持体の折り返し部の前端部との引っ掛かりを、より一層、抑止する。
【００３６】
本発明ノック式筆記具は、前記請求項２の構成により、被挟持体の折り返し部の前端部が前記係止突起に引っ掛かることを、より一層、回避する。
【００３７】
【図面の簡単な説明】
【図１】本発明の一実施例のペン先没入状態（セーフティ機構作動後の状態・クリップ係合解除状態）の縦断面図である。
【図２】図１の作用を説明する要部拡大縦断面図である。
【図３】図１の実施例のペン先突出状態の縦断面図である。
【図４】図３のＡ−Ａ線拡大断面図である。
【図５】図３のＢ−Ｂ線拡大断面図である。
【図６】図１の実施例のペン先没入状態（セーフティ機構作動前の状態・クリップ係合状態）の縦断面図である。
【図７】図１のカム筒の拡大縦断面図である。
【図８】（ａ）は図１のノック棒の拡大図であり、（ｂ）は図１の回転体の拡大図である。
【図９】従来の例を示す図である。
【符号の説明】
１ノック式筆記具
２軸筒
２１先体
２２先端孔
２３スライド孔
３レフィル
３１ペン先
４クリップ
４１挟持突起
４２係止段部
４３凹曲面
５カム筒
５１係止突起
５２ガイド突起
５３カム歯
５４縦溝
６回転子
６１突条
６１ａ後端部
６１ｂ側面部
６２小径部
７ノック棒
７１カム歯
８弾発体
９被挟持体
９１折り返し部
Ｌ間隙[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a knock type writing instrument. Specifically, the pen tip of the refill is projected from the tip of the shaft cylinder by knocking operation, and even if the writing instrument is inserted into the pocket or the like with the pen tip protruding, the engagement state is released and the pen tip is moved to the shaft cylinder. The present invention relates to a knock-type writing instrument provided with a clip safety mechanism that immerses the inside and prevents clothes and the like from being soiled.
[0002]
In the present invention, “front” refers to the pen tip side, and “rear” refers to the knock operation side.
[0003]
[Prior art]
Conventionally, Japanese Utility Model Publication No. 63-31987 discloses that a writing body (corresponding to the refill of the present application) having a pressing member at the rear end of the shaft tube and inserted in the shaft tube so as to be movable back and forth is used as the pressing member. In the knock type writing instrument that is urged, a locking hole 4a (corresponding to the locking step portion of the present application) is provided at the tip of the clip, and a hole is provided in the shaft cylinder at a position opposite to the locking hole. A writing body loading / unloading device for a knock type writing instrument, wherein an engaging portion 2b '(corresponding to a locking projection of the present application) interlocked with a child protrudes from the hole and is engaged with and disengaged from the locking hole 4a of the clip. Is disclosed. (See Figure 9)
[0004]
[Problems to be solved by the invention]
In the conventional writing instrument, as shown in FIG. 9, the engaging surface of the locking protrusion 2b ′ has a vertical surface shape (or a hook shape) so as to make a reliable engagement with the locking step portion 4a of the clip. ing. Therefore, when the writing implement is pulled out from the sandwiched body 9 after being inserted into a sewn sandwiched body 9 (for example, a cloth pocket such as clothes or a leather insertion ring such as a binder notebook) There is a risk that the folded portion 91 may be damaged due to being easily hooked to the folded portion 91 (sewn portion) at the edge of the sandwiched body 9.
[0005]
The present invention solves the above-mentioned conventional problems, and when the writing tool is pulled out from the sandwiched body after being inserted into a sandwiched body having stitched folded parts such as clothes, the locking projections are sandwiched. An object of the present invention is to provide a knock type writing instrument that can be smoothly pulled out without being caught by a folded portion (sewn portion) of a body edge, and as a result, damage to a sandwiched body is avoided.
[0006]
[Means for Solving the Problems]
[1] In the present invention, when the knock rod 7 protruding from the rear end of the shaft cylinder 2 is pressed forward in the axial direction, the locking protrusion 51 protruding radially outward from the outer surface of the shaft cylinder 2 is When the clip 4 is lifted, the engagement state is released when the refill 3 is moved backward, and the locking projection 51 is moved with the rearward movement of the refill 3. Is a knock-type writing instrument 1 having a clip safety mechanism that moves rearwardly, and a guide protrusion 52 that protrudes radially outward is provided behind the locking protrusion 51, and the guide protrusion 52 is connected to the locking protrusion 51. It is possible to move in the front-rear direction while maintaining a constant interval (interlocking is possible), and a clamping protrusion 41 is provided on the inner surface of the front end of the clip 4 so as to protrude radially inward and include a locking step 42. Engagement with the locking projection 51 Of time, and the guide protrusions 52 front and the clamping projection 41 rear surface to become close (Claim 1) requirements. (See Figs. 3 and 6)
[0007]
(Function)
The guide protrusion 52 positioned behind the locking protrusion 51 prevents the front end portion of the folded portion 91 of the sandwiched body 9 from being caught on the rear surface of the locking protrusion 51. Further, since the guide protrusion 52 and the locking protrusion 51 are interlocked with each other while maintaining a constant distance, the guide protrusion 52 is always positioned at a constant distance behind the locking protrusion 51. Yes. Therefore, since the distance between the locking projection 51 and the guide projection 52 does not increase, it is difficult for the folded portion 91 of the sandwiched body 9 to enter between the locking projection 51 and the guide projection 52. It can be further avoided that the front end portion of the folded portion 91 is caught by the locking projection 51. (See Figure 2)
By bringing the front surface of the guide protrusion 52 and the rear surface of the holding protrusion 41 close to each other, the gap between the rear surface of the guide protrusion 52 and the front surface of the locking protrusion 51 is made as small as possible. However, it is difficult to enter between the locking projection 51 and the guide projection 52, and can smoothly move over the rear surface of the locking projection 51 from the rear surface of the guide projection 52 to the front surface of the locking projection 51. It is further avoided that the front end is caught by the locking projection 51.
The gap L (maximum dimension in the longitudinal direction) between the front surface of the guide protrusion 52 and the rear surface of the locking protrusion 51 is preferably in the range of 1 mm to 5 mm. Because, if the gap is smaller than 1 mm, the engagement between the locking protrusion 51 and the locking step 42 becomes unstable. On the other hand, if the gap is larger than 5 mm, the folded portion of the sandwiched body 9 This is because the catching restraining action on 91 is insufficient.
The rear surface of the guide protrusion 52 is preferably an inclined surface or a curved surface. Thereby, the catch between the guide protrusion 52 and the front end portion of the folded portion 91 of the end edge of the sandwiched body 9 can be further suppressed.
[0008]
[2] In the knock-type writing instrument 1 according to the first aspect, it is preferable that the guide protrusion 52 protrudes more outward in the radial direction than the locking protrusion 51 (claim 2).
[0009]
(Function)
The guide protrusion 52 is located behind the locking protrusion 51 and protrudes more outward in the radial direction than the locking protrusion 51. Therefore, after the clip 4 is inserted into the sandwiched body 9 having a folded back portion 91 such as clothes, the locking projection 51 is clamped by the guide projection 52 when the writing instrument 1 is extracted from the sandwiched body 9. It is possible to prevent the writing instrument 1 from being pulled out more smoothly by suppressing the hooking portion 91 (specifically, the front end portion of the turning portion 91) at the nine end edges from being caught. (See Figure 2)
[0010]
[0011]
[0012]
[0013]
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0015]
1 to 8 show an embodiment of the present invention. The knock type writing instrument 1 according to the present embodiment includes a shaft tube 2, a refill 3 accommodated in the shaft tube 2, and a pen tip 31 of the refill 3 through a tip hole 22 (specifically, a shaft A retracting mechanism is provided that allows the front end of the cylinder 2 to be retracted and retracted from the front end hole 22) of the removable front body 21 by screwing. The intrusion mechanism has a clip safety mechanism that releases the pen tip protruding state and inserts the pen tip 31 into the shaft tube 2 when the clip 4 of the writing instrument 1 is inserted into a pocket or the like in the pen tip protruding state. .
[0016]
(Infestation mechanism)
The retracting mechanism is a knock-type retracting mechanism using a rotating cam mechanism, and engages with a cylindrical cam cylinder 5 disposed in the shaft cylinder 2 and a cam portion of the cam cylinder 5 and a rear end of the refill 3 A rotor 6 that contacts the rotor 6, a knock bar 7 that engages with the rotor 6 and protrudes from the rear end of the shaft cylinder 2, and a resilient body 8 that is housed in the shaft cylinder 2 and biases the refill 3 backward. (For example, a coil spring). Further, the retracting mechanism is a double knock type in which both the pen tip protruding operation and the pen tip retracting operation push the knock bar 7 forward.
[0017]
(Safety mechanism)
The safety mechanism includes a cam cylinder 5 having a locking projection 51 protruding from the outer surface of the shaft cylinder 2 on the outer surface, and a clip 4 having a locking step portion 42 engaged with the locking projection 51 on the inner surface. . The cam cylinder 5 is accommodated in the shaft cylinder 2 so as to be movable back and forth. The clip 4 is fixed to the outer surface of the shaft cylinder 2.
[0018]
(clip)
Specifically, the clip 4 is obtained by injection molding of a synthetic resin, and protrudes integrally from the outer surface of the shaft tube 2. On the inner surface near the front end of the clip 4, a clamping protrusion 41 is integrally provided. The clamping protrusion 41 has a curved front surface and rear surface, and a locking step 42 is formed on the inner surface of the front portion.
[0019]
(Cam barrel)
The cam cylinder 5 is a cylindrical body, and is slidably accommodated in the shaft cylinder 2 so as to be able to advance and retreat. A locking projection 51 and a guide projection 52 are integrally provided on the outer surface of the cam cylinder 5. A slide hole 23 is provided in the side wall of the shaft cylinder 2 facing the inner surface in the radial direction of the clip 4, and the locking projection 51 and the guide projection 52 are passed through the slide hole 23 from the inner surface of the shaft cylinder 2. 2 protrudes slidably on the outer surface.
[0020]
The locking projection 51 has a hook shape and can be engaged with the locking step 42 of the clip 4. The guide protrusion 52 is located behind the locking protrusion 51 and protrudes radially outward from the locking protrusion 51. The guide protrusion 52 has a mountain shape with inclined surfaces on the front and rear surfaces and a curved surface on the top. .
[0021]
(Operation of safety mechanism)
As shown in FIG. 3 or FIG. 6, the locking projection 51 of the cam cylinder 5 and the locking step 42 of the clip 4 are engaged during normal writing (that is, when the safety mechanism is not in operation). Yes. At this time, the front surface of the guide protrusion 52 and the rear surface of the clamping protrusion 41 are close to each other.
[0022]
When the clip 4 of the writing instrument 1 is inserted into the sandwiched body 9 from the state of FIG. 3 or 6, the safety mechanism is activated by lifting the clip 4 radially outward, and the locking projection 51 The engagement protrusion 51 and the guide protrusion 52 move rearward along the inner surface of the slide hole 23 in accordance with the rearward movement of the cam cylinder 5 due to the rear urging of the elastic body 8 when the engagement of the engagement step portion 42 is released. To do. As a result, the pen tip 31 is immersed in the shaft cylinder 2.
[0023]
(Operation of guide protrusion)
When the folded portion 91 is present inside the edge of the clamped body 9 that has been stitched, even if the clip 4 of the writing instrument 1 is inserted into the pocket, the writing instrument 1 is removed from the clamped body 9 as shown in FIG. At this time, the front end portion of the folded portion 91 smoothly slides forward with the rear surface of the guide portion, and the writing instrument 1 can be smoothly removed from the sandwiched body 9 without being caught by the rear surface of the locking projection 51. it can.
[0024]
A concave curved surface 43 is provided at the boundary between the inner surface of the clip 4 and the rear surface of the holding protrusion 41. Thus, in contrast to FIG. 2 (a sandwiched body having the folded portion 91 on the inner surface), when inserted into the sandwiched body 9 having the folded portion 91 on the outer surface, the folded portion 91 is formed on the rear surface of the sandwiching protrusion 41. The front end is not caught and the writing instrument 1 can be smoothly removed.
[0025]
(Cam barrel)
As shown in FIGS. 7 and 5, the cam cylinder 5 has a cam portion with which the rotor 6 engages on the inner surface thereof. The cam portion includes a plurality of serrated cam teeth 53 projecting forward and three longitudinal grooves 54 formed between the cam teeth 53.
[0026]
(Rotor)
As shown in FIG. 8B, the rotor 6 includes three protrusions 61 extending in the longitudinal direction on the outer surface thereof, and the inclined rear end 61a of the protrusion 61 has the cam cylinder. 5 and the side surface portion 61 b extending in the longitudinal direction of the protrusion 61 engages with the vertical groove 54 of the cam cylinder 5. Further, the rotor 6 is urged rearward together with the refill 3 by an elastic body 8 in the shaft tube 2. Further, a small diameter portion 62 is provided behind the rear end portion 61 a of the protrusion 61, and the small diameter portion 62 is loosely inserted into the knock bar 7.
[0027]
(Knock stick)
As shown in FIGS. 8A and 2, the knock bar 7 is a bottomed cylindrical body and includes a plurality of serrated cam teeth 71 at the front end. The cam teeth 71 can engage with the rear end portion 61a of the inclined surface of the protrusion 61 of the rotor 6 at least during a knocking operation.
[0028]
(Operation of the haunting mechanism)
Projection operation When the pen tip 31 is changed from the immersive state (FIG. 6) to the projecting state (FIG. 3), the rear end of the knock bar 7 protruding from the rear end of the shaft cylinder 2 is pressed forward. At this time, the cam teeth 71 at the front end of the knock bar 7 engage with the rear end portion 61 a of the inclined surface of the protrusion 61 formed on the rotor 6 that contacts the rear end of the refill 3. Therefore, simultaneously with the pressing operation, the rotor 6 is moved forward while sliding the side surface portion 61 b of the protrusion 61 in the vertical groove 54 of the cam cylinder 5. Thereafter, the ridge 61 comes out of the longitudinal groove 54 forward, and the rotor 6 becomes free in the rotational direction. At this time, the engagement between the cam teeth 71 of the knock bar 7 and the rear end portion 61a of the rotor 6 causes the rotor 6 to be slightly fed in the rotational direction, so that the rear end portion 61a of the protrusion 61 has the cam cylinder 5 The cam teeth 53 are locked. With the forward movement of the rotor 6, the refill 3 is pressed forward against the forward bias of the projectile 8, and the pen tip 31 protrudes forward from the tip hole 22 of the shaft cylinder 2. By the engagement between the rear end portion 61a of the protrusion 61 and the cam teeth 53 of the cam barrel 5, the pen tip protruding state is maintained.
[0029]
When the pen tip 31 is changed from the protruding state (FIG. 3) to the immersed state (FIG. 6), the rear end portion of the knock bar 7 protruding from the rear end of the shaft tube 2 is pushed forward in the same manner as the protruding operation. . At this time, the cam teeth 71 at the front end of the knock bar 7 engage with the rear end portion 61 a of the inclined surface of the protrusion 61 formed on the rotor 6 that contacts the rear end of the refill 3. Therefore, simultaneously with the pressing operation, the rotor 6 is slightly fed in the rotation direction, and the engagement between the rear end portion 61a of the protrusion 61 and the cam teeth 53 of the cam cylinder 5 is released. Since the rotor 6 is urged rearward by the projectile 8 through the refill 3, simultaneously with the disengagement between the rear end portion 61 a of the protrusion 61 and the cam teeth 53 of the cam cylinder 5, With the rearward movement along the longitudinal groove 54 of the protrusion 61, the rotor 6 is moved rearward. That is, the refill 3 is moved rearward, and the pen tip 31 protruding forward from the tip hole 22 is immersed in the shaft tube 2.
[0030]
(Refill)
The refill 3 has a ballpoint pen tip (for example, a ballpoint pen tip holding a ball having an outer diameter of 0.3 mm at the tip) at the tip, and an oil-based ink or water-based ink inside, and a follower that moves forward according to the consumption of the ink (For example, a high-viscosity fluid such as silicone oil). The refill 3 can be taken out of the shaft tube 2 and replaced by removing the tip body 21 (a tapered tube body having a front end hole 22 at the front end) screwed to the front end of the shaft tube 2. Further, the step on the inner surface of the tip 21 holds the projectile 8 that biases the refill 3 forward.
[0031]
In the present invention, the rear surface of the locking projection 51 may be, for example, a vertical surface shape in addition to the hook shape.
[0032]
In the present invention, in addition to the configuration in which the locking step portion 42 is provided in the holding protrusion 41, for example, a configuration in which a recess or a hole is simply provided in the inner surface of the clip 4 may be used.
[0033]
In the present invention, in addition to the ballpoint pen body, the pen tip 31 includes a fiber pen body, a porous pen body, a plastic extrusion pen body with an axial ink outlet path, a thin tube pen body, and a tip. Any of a plate-like pen body (so-called fountain pen nib) having a slit and a mechanical pencil may be used.
[0034]
In the present invention, the material of the clip 4 may be a metal other than a synthetic resin. The clip 4 may be formed integrally with the shaft tube 2, but may be formed by attaching another member independent of the shaft tube 2.
[0035]
【The invention's effect】
In the knock type writing instrument according to the first aspect of the present invention, when the writing instrument is pulled out from the sandwiched body after being inserted into the sandwiched body having the stitched folded portion, the locking projection is clamped by the guide projection. The writing implement can be smoothly extracted from the sandwiched body without being caught by the folded portion of the body, and the sandwiched body can be prevented from being damaged. The knock type writing instrument of the present invention further suppresses the catch between the guide protrusion and the front end portion of the folded portion of the sandwiched body by the configuration of the first aspect.
[0036]
The knock type writing instrument according to the present invention further avoids the front end portion of the folded portion of the sandwiched body from being caught by the locking projection by the configuration of the second aspect.
[0037]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a pen tip immersion state (a state after operating a safety mechanism and a clip engagement released state) according to an embodiment of the present invention.
FIG. 2 is an enlarged vertical sectional view of a main part for explaining the operation of FIG.
3 is a longitudinal sectional view of the pen tip protruding state of the embodiment of FIG. 1; FIG.
4 is an enlarged sectional view taken along line AA in FIG. 3;
5 is an enlarged sectional view taken along line BB in FIG.
6 is a longitudinal cross-sectional view of the pen tip immersion state (state before operating the safety mechanism / clip engagement state) of the embodiment of FIG. 1; FIG.
7 is an enlarged vertical cross-sectional view of the cam cylinder of FIG. 1. FIG.
8A is an enlarged view of the knock bar of FIG. 1, and FIG. 8B is an enlarged view of the rotating body of FIG.
FIG. 9 is a diagram illustrating a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Knock-type writing instrument 2 Shaft cylinder 21 Tip body 22 Tip hole 23 Slide hole 3 Refill 31 Pen tip 4 Clip 41 Clamping protrusion 42 Locking step part 43 Recessed curved surface 5 Cam cylinder 51 Locking protrusion 52 Guide protrusion 53 Cam tooth 54 Vertical groove 6 Rotor 61 Projection 61a Rear end portion 61b Side surface portion 62 Small diameter portion 7 Knock bar 71 Cam tooth 8 Ejection body 9 Nipped body 91 Folding portion L Gap

Claims

When the knock rod (7) protruding from the rear end of the shaft tube (2) is pressed forward in the axial direction, the locking projection (51) protruding radially outward from the outer surface of the shaft tube (2) is refilled ( When the clip (4) is lifted, the engagement state is released and the refill (4) is engaged with the engaging step (42) on the inner surface of the front end of the clip (4). 3) A knock-type writing instrument having a safety mechanism in which the locking projection (51) moves backward with the rearward movement of 3), and a guide projection (52) protruding radially outwardly behind the locking projection (51). ), The guide protrusion (52) can be moved in the front-rear direction while maintaining a certain distance from the locking protrusion (51), and the clip (4) protrudes radially inwardly on the inner surface of the front end and has a locking step. A clamping protrusion (41) provided with a portion (42) is provided, (42) and the locking projection (51) and the time of engagement, the guide protrusion (52) knock-type writing instrument wherein the front clamping projection (41) After the surface is characterized by being in close proximity.

The knock type writing instrument according to claim 1, wherein the guide protrusion (52) protrudes more radially outward than the locking protrusion (51).