JP4361810B2

JP4361810B2 - Writing instrument

Info

Publication number: JP4361810B2
Application number: JP2004003889A
Authority: JP
Inventors: 洋介石井
Original assignee: Micro Co Ltd
Current assignee: Micro Co Ltd
Priority date: 2004-01-09
Filing date: 2004-01-09
Publication date: 2009-11-11
Anticipated expiration: 2024-01-09
Also published as: JP2005193585A

Description

本発明は、回転カム式繰出機構によりリフィールを筆記位置と収納位置に移動させるようにした筆記具に関し、特に蒸発しやすい筆記成分を含むリフィールを有する筆記具に好適な筆記具に関するものである。 The present invention relates to a writing instrument in which a refill is moved to a writing position and a storage position by a rotating cam type feeding mechanism, and more particularly to a writing instrument suitable for a writing instrument having a refill containing a writing component that easily evaporates.

筆記具の回転カム式繰出機構は種々知られているが、基本的には、外カムと回転カムと案内カムを有し、回転カムは軸方向に移動可能にかつ回転可能に設けられ、外カムは該回転カムの軸方向への移動を規制すると共に該回転カムに回転を与え、また案内カムは上記回転カムが外カムから外れたときに該回転カムに回転を与える機能を有している。そして、通常、上記外カムを軸筒の内面に形成し、上記案内カムを前部に形成したノック体の後部を軸筒の後端から突出し、該ノック体をノック操作することにより上記回転カムを介して上記リフィールを筆記位置に前進させたり、収納位置に後退させたりできるように構成されている（例えば、特許文献１参照）。 Various rotary cam type feeding mechanisms for writing instruments are known. Basically, the rotary cam has an outer cam, a rotary cam, and a guide cam, and the rotary cam is provided so as to be movable and rotatable in the axial direction. Restricts movement of the rotating cam in the axial direction and applies rotation to the rotating cam, and the guide cam has a function of rotating the rotating cam when the rotating cam is detached from the outer cam. . Usually, the outer cam is formed on the inner surface of the shaft cylinder, the rear part of the knock body having the guide cam formed at the front portion is projected from the rear end of the shaft cylinder, and the knock body is knocked to operate the rotating cam. The refill is configured to be advanced to the writing position or retracted to the storage position via (see, for example, Patent Document 1).

従来のこの種の筆記具は、リフィールを後方に付勢するばねを有し、このばねの作用でリフィールを収納位置に後退させるように構成されているから、確実に後退させるためには該ばねの弾性作用を大きくしなければならない。そのように弾性作用を大きくすると、後退動を停止させる部位に大きな衝撃が作用し、破損を生じることがあり、また組立時に必要以上の負荷がかかり、作業効率も悪くなる。 A conventional writing instrument of this type has a spring that biases the refill backward, and is configured to retract the refill to the storage position by the action of the spring. The elastic action must be increased. When the elastic action is increased in such a manner, a large impact is applied to a portion where the backward movement is stopped, which may cause breakage, and an unnecessary load is applied at the time of assembly, resulting in poor work efficiency.

また、リフィールの筆記成分が蒸発しやすい物質であるときは、リフィールの筆記先端を気密にシールするように構成されているが、上記のようにリフィールを収納位置に後退させるときに大きな衝撃が発生すると、シールが不確実になることもあった。
特許第３０２７１３３号公報（図面） Also, when the refill writing component is a substance that tends to evaporate, it is configured to hermetically seal the refill writing tip, but as described above, a large impact occurs when the refill is retracted to the storage position. Then, the seal might become uncertain.
Japanese Patent No. 3027133 (drawing)

本発明の解決課題は、回転カム式繰出機構を有する筆記具において、リフィールを収納する際の衝撃を和らげ、部品点数が少なく、筆記先端のシールも確実にできるようにした筆記具を提供することである。 The problem to be solved by the present invention is to provide a writing instrument having a rotating cam type feeding mechanism, which reduces the impact when storing the refill, reduces the number of parts, and can reliably seal the writing tip. .

本発明によれば、軸筒内に設けられ軸方向に延びる深さの深いカム溝と浅いカム溝を交互に形成した外カムと、軸方向に移動可能にかつ回転可能に該外カム内に収納され上記外カムのカム溝に係合可能な突起を有し前部に前端カム面を形成した回転カムと、該回転カムに連結され後方に付勢されているリフィールと、該回転カムの前方に設けられ上記回転カムの突起が上記外カムのカム溝から外れたとき上記回転カムを回転させるよう上記回転カムの前端カム面が係合可能なカム面を有する案内カムと、上記回転カムの突起が上記外カムの深いカム溝に係合したとき該回転カムの後退動を阻止するよう上記外カムの後方に設けられたストッパーと、該ストッパーに当接する際の衝撃を緩和するよう上記回転カムの後端に設けられた緩衝部材を具備することを特徴とする筆記具が提供され上記課題が解決される。
According to the present invention, the outer cam provided in the shaft cylinder and having the deep cam grooves and the shallow cam grooves extending in the axial direction alternately, and the outer cam movable in the axial direction and rotatable in the outer cam. A rotating cam that has a projection that is housed and can be engaged with the cam groove of the outer cam and that has a front cam surface formed at the front, a refill that is connected to the rotating cam and biased rearward, A guide cam having a cam surface which is provided in front and engageable with a front cam surface of the rotating cam so as to rotate the rotating cam when a protrusion of the rotating cam is disengaged from a cam groove of the outer cam; and the rotating cam A stopper provided at the rear of the outer cam so as to prevent the revolving movement of the rotating cam when the projection of the outer member engages with a deep cam groove of the outer cam , and the above-mentioned so as to alleviate the impact when contacting the stopper. a buffer member provided at the rear end of the rotating cam Is writing instrument characterized by Bei provided above problems are solved.

また、本発明の上記筆記具の緩衝部材は、回転カムと一体的に形成した伸縮可能な緩衝片であり、上記リフィールの筆記先端にはエアタイトスリーブが設けられ、該エアタイトスリーブの前端開口部を軟質プラスチック等の軟質材料で作り、該前端開口部を開閉する蓋体を硬質プラスチック等の硬質材料で構成することにより上記課題を解決することができる。 Further, the cushioning member of the writing instrument of the present invention is an extensible cushioning piece integrally formed with the rotating cam, and an airtight sleeve is provided at the writing tip of the refill, and the front end opening of the airtight sleeve is soft. The above-mentioned problem can be solved by making the cover body made of a soft material such as plastic and opening and closing the front end opening portion with a hard material such as hard plastic.

本発明は上記のように構成され、回転カムの後端に緩衝部材を設けてストッパーに当接するようにしたので、リフィールを後方に付勢しているばねの弾性作用を大きくしても、リフィールを収納する際に生じる衝撃力を小さくすることができ、破損等を生じにくくでき、また上記緩衝部材を回転カムと一体的な伸縮可能な緩衝片で構成すると部品点数も少なく、組み立ても容易で、経済的である。 Since the present invention is configured as described above and the shock absorbing member is provided at the rear end of the rotating cam so as to contact the stopper, the refill is improved even if the elastic action of the spring biasing the refill is increased. The impact force that occurs when storing the battery can be reduced, damage or the like is less likely to occur, and if the cushioning member is composed of a cushioning piece that can be expanded and contracted integrally with the rotating cam, the number of parts is small and assembly is easy. Is economical.

その上、上記リフィールを収納した際に筆記先端をシールするようエアタイトスリーブを設け、該エアタイトスリーブの前端開口部を軟質プラスチック等の軟質材料で作り、該前端開口部を開閉する蓋体を硬質プラスチック等の硬質材料で構成すると、蓋板の押圧力やリフィールの付勢力を低減することができ、上記リフィールを後退時に衝撃を和らげつつ移動させるようにしても上記蓋体を前端開口部に弾性的に圧着して確実にシールすることができる。 In addition, an air tight sleeve is provided to seal the writing tip when the refill is stored, the front end opening of the air tight sleeve is made of a soft material such as soft plastic, and the lid for opening and closing the front end opening is made of hard plastic. If the cover is made of a hard material, it is possible to reduce the pressing force of the cover plate and the urging force of the refill, and even if the refill is moved while mitigating the impact when retreating, the cover body is elastic to the front end opening. It is possible to securely seal it by press-bonding to.

図１は本発明の一実施例を示し、各種のリフィール、例えばマーカー、水性インキペン、水性ボールペン、修正ペン、蛍光ぺンその他の蒸発しやすい筆記成分を含むリフィール（１）を有する筆記具（２）が示されており、該リフィール（１）を収納した軸筒（３）の先端には、通孔（４）を有する先具（５）が連結されている。 FIG. 1 shows an embodiment of the present invention, and a writing instrument (2) having various refills such as markers, water-based ink pens, water-based ballpoint pens, correction pens, fluorescent pens and other refills (1) containing writing components that easily evaporate. The tip (5) which has a through-hole (4) is connected with the front-end | tip of the axial cylinder (3) which accommodated this refill (1).

上記軸筒（３）内には、ストッパー（６）が形成され、該ストッパー（６）とリフィール（１）の肩部（７）間にばね（８）を設けて、上記リフィール（１）を後方に付勢してあり、該ストッパー（６）の前方には回転カム式繰出機構を構成する外カム（９）が形成されている。該外カム（９）は、公知のように、回転カム（１０）の軸方向の移動を規制するよう軸方向に延びる深さの深いカム溝（１１ａ）と浅いカム溝（１１ｂ）を交互に有し、前端に回転カム（１０）を回転するための山形状のカム面（１２）が形成され、上記軸筒（３）の前部内面に一体的に設けられているが、別体の略筒状体に形成して上記軸筒内に固定するようにしてもよい（図示略）。 A stopper (6) is formed in the shaft tube (3), and a spring (8) is provided between the stopper (6) and a shoulder (7) of the refill (1) to dispose the refill (1). An outer cam (9) that constitutes a rotating cam type feeding mechanism is formed in front of the stopper (6). As is well known, the outer cam (9) has alternating cam grooves (11a) and shallow cam grooves (11b) extending in the axial direction so as to restrict axial movement of the rotating cam (10). A crest-shaped cam surface (12) for rotating the rotary cam (10) is formed at the front end, and is provided integrally with the front inner surface of the shaft tube (3). You may make it form in a substantially cylindrical body and fix it in the said shaft cylinder (illustration omitted).

上記回転カム（１０）は、上記軸筒内で軸方向に移動可能にかつ回転可能に設けられ、上記外カム（９）内に挿入できる外径を有する略円筒状に形成され、内面に上記リフィール（１）の首部（１３）に嵌合する連結部（１４）を有している。該回転カム（１０）の外周には、図２に示すように上記外カム（９）のカム溝（１１ａ）、（１１ｂ）に係合する突起（１５）が設けられ、該突起（１５）の後端には上記外カム（９）のカム面（１２）に係合する傾斜カム面（１６）が設けられている。また、該回転カム（１０）の前部には、案内カム（１７）に係合する前端カム面（１８）が設けられている。 The rotary cam (10) is provided so as to be axially movable and rotatable within the shaft cylinder, and is formed in a substantially cylindrical shape having an outer diameter that can be inserted into the outer cam (9). It has a connection part (14) fitted to the neck part (13) of the refill (1). Protrusions (15) that engage with the cam grooves (11a) and (11b) of the outer cam (9) are provided on the outer periphery of the rotating cam (10), as shown in FIG. An inclined cam surface (16) that engages with the cam surface (12) of the outer cam (9) is provided at the rear end. Further, a front end cam surface (18) that engages with the guide cam (17) is provided at the front portion of the rotating cam (10).

上記回転カム（１０）の連結部（１４）は、リフィール（１）の筆記先端（１９）側から首部（１３）まで挿入できるよう弾性的に拡開可能に形成され、上記首部（１３）まで挿入したとき上記リフィール（１）に形成したフランジ（２０）に前端縁（２１）が係合し、内方肩部（２２）に基端縁（２３）が係合する。なお、該回転カム（１０）はリフィールに嵌合した状態で回転できるよう該リフィールに遊嵌しているが、該リフィールに固定的に設けたり、該リフィールと一体的に形成してもよい。 The connecting portion (14) of the rotating cam (10) is formed so as to be elastically expandable so that it can be inserted from the writing tip (19) side to the neck portion (13) of the refill (1), up to the neck portion (13). When inserted, the front end edge (21) engages with the flange (20) formed in the refill (1), and the base end edge (23) engages with the inner shoulder (22). The rotary cam (10) is loosely fitted to the refill so that it can be rotated in a state of being fitted to the refill. However, the rotary cam (10) may be fixedly provided on the refill or formed integrally with the refill.

上記回転カム（１０）の後端には、緩衝部材（２４）を設けてあり、それにより該回転カムが上記ストッパー（６）に当接する際の衝撃を緩和するようにしてある。該緩衝部材としては、別体のばね等を用いることもできるが、好ましくは図に示すようにプラスチック材料で回転カムを成形する際に後部に筒状体を作り、その一部にスリットや切欠き等を形成し軸方向に弾性作用をもって伸縮可能な緩衝片（２５）を一体的に設けるとよい。このような一体的な緩衝片（２５）を回転カムに設けると、部品点数が少なくなり、製造が簡単で、組み立てが容易となる。 A buffer member (24) is provided at the rear end of the rotary cam (10), so that the impact when the rotary cam comes into contact with the stopper (6) is reduced. As the buffer member, a separate spring or the like can be used, but preferably a cylindrical body is formed at the rear when a rotating cam is formed of a plastic material as shown in the figure, and a slit or a cut is formed at a part thereof. It is preferable to integrally provide a buffer piece (25) that is formed with a notch or the like and can be expanded and contracted with an elastic action in the axial direction. When such an integral buffer piece (25) is provided on the rotating cam, the number of parts is reduced, manufacturing is simple, and assembly is facilitated.

上記先具（５）の後端には、上記回転カム（１０）の前方に位置するよう案内カム（１７）が一体的に形成されている。該案内カム（１７）は、上記回転カム（１０）の突起（１５）が外カムのカム溝（１１ａ）、（１１ｂ）から外れたとき、該回転カム（１０）の前端カム面（１８）が当って該回転カム（１０）を回転させるよう山形状のカム面（２６）を有している。該カム面（２６）は、回転カム（１０）を所定角度づつ回転させるよう上記外カム（９）のカム面（１２）に対向する部位に固定的に位置している。 A guide cam (17) is integrally formed at the rear end of the tip (5) so as to be positioned in front of the rotating cam (10). The guide cam (17) has a front cam surface (18) of the rotating cam (10) when the protrusion (15) of the rotating cam (10) is disengaged from the cam grooves (11a) and (11b) of the outer cam. Has a mountain-shaped cam surface (26) so as to rotate the rotating cam (10). The cam surface (26) is fixedly positioned at a portion facing the cam surface (12) of the outer cam (9) so as to rotate the rotating cam (10) by a predetermined angle.

上記構成により、収納位置で軸筒（３）の後端から突出しているリフィール（１）を直接若しくは該リフィールの後部に取り付けた適宜の操作片（図示略）を介して前方にノックすると、回転カム（１０）の突起（１５）は外カム（９）の深いカム溝（１１ａ）から外れ、上記案内カム（１７）に当って回転カムは回転され、ノックを止めると上記突起（１５）は外カム（９）の浅いカム溝（１１ｂ）に係合し、リフィール（１）は筆記先端（１９）が通孔（４）から突出して筆記位置に保持される。その状態でリフィール（１）をノックすると、上記回転カム（１０）は上述のように回転し、ノックを止めると上記突起（１５）は外カム（９）の深いカム溝（１１ａ）に係合し、リフィール（１）は収納位置に後退する。この後退動の際、上記回転カム（１０）の後端は上記ストッパー（６）に当
るが、その衝撃は緩衝部材（２４）によりクッション距離（Ａ）の範囲内で緩和される。 With the above configuration, when the refill (1) protruding from the rear end of the shaft tube (3) at the storage position is knocked forward directly or via an appropriate operation piece (not shown) attached to the rear portion of the refill, The protrusion (15) of the cam (10) is disengaged from the deep cam groove (11a) of the outer cam (9), the rotating cam is rotated against the guide cam (17), and when the knock is stopped, the protrusion (15) Engaging with the shallow cam groove (11b) of the outer cam (9), the refill (1) is held in the writing position with the writing tip (19) protruding from the through hole (4). When the refill (1) is knocked in this state, the rotating cam (10) rotates as described above, and when the knocking is stopped, the protrusion (15) engages with the deep cam groove (11a) of the outer cam (9). The refill (1) then moves back to the storage position. At the time of the backward movement, the rear end of the rotating cam (10) hits the stopper (6), but the impact is alleviated within the cushion distance (A) by the buffer member (24).

上記リフィールの筆記成分が蒸発性でないボールペンやシャープペンシルの場合は上記構成でよいが、蒸発性の場合には、上記先具（５）内にリフィールの筆記先端（１９）をを取り囲むようエアタイトスリーブ（２７）を設けることが好ましい。該エアタイトスリーブ（２７）は、前後動可能に設けられ、前端開口部（２８）を開閉する蓋体（２９）を有し、リフィール（１）が筆記位置に移動するとき該蓋体（２９）を開放し、収納位置に移動するとき該蓋体（２９）を閉鎖して上記筆記先端（１９）を気密的に保持するように構成されている。 In the case where the writing component of the refill is a non-evaporable ballpoint pen or mechanical pencil, the above configuration may be used. However, in the case of evaporating, the air tight sleeve surrounds the writing tip (19) of the refill in the tip (5). (27) is preferably provided. The air tight sleeve (27) is provided so as to be movable back and forth, and has a lid (29) for opening and closing the front end opening (28). When the refill (1) moves to the writing position, the lid (29) Is opened, and the lid (29) is closed to move the storage position to hold the writing tip (19) in an airtight manner.

上記エアタイトスリーブ（２７）は、内面に上記リフィール（１）の周面に形成した係止部（３０）に弾性的に係合可能な嵌合部（３１）を有し、該嵌合部（３１）は上記リフィール（１）が収納位置にあるとき上記係止部（３０）に気密的に嵌合（係合）している。また、上記リフィール（１）が筆記位置に移動するとき該リフィールの移動に伴ってエアタイトスリーブ（２７）も移動するが、該エアタイトスリーブ（２７）の一部が軸筒の内面等に当って前進動が阻止されると、上記嵌合部（３１）と係止部（３０）の嵌合（係合）は外れ、エアタイトスリーブ（２７）は前進位置に保持され、リフィール（１）のみが前進する。 The air tight sleeve (27) has a fitting portion (31) that can be elastically engaged with a locking portion (30) formed on the inner surface of the refill (1) on the inner surface. 31) is fittingly engaged (engaged) with the locking portion (30) when the refill (1) is in the storage position. Further, when the refill (1) moves to the writing position, the air tight sleeve (27) also moves along with the movement of the refill, but a part of the air tight sleeve (27) abuts against the inner surface of the shaft tube and advances. When the movement is blocked, the fitting portion (31) and the locking portion (30) are disengaged (engaged), the air tight sleeve (27) is held in the advanced position, and only the refill (1) is advanced. To do.

上記前端開口部（２８）は、斜めに傾斜しており、上記蓋体（２９）は、該前端開口部（２８）の基端に一体的なヒンジ（３２）で揺動可能に設けられ、背面には押圧リブ（３３）が形成されている。先具（５）の内面には該押圧リブ（３３）が摺動する摺動面（３４）が有り、該摺動面（３４）に続く部位には上記押圧リブ（３３）が嵌入するよう窓孔（３５）が設けられている。上記エアタイトスリーブ（２７）が後退位置にあるとき、上記押圧リブ（３３）は上記摺動面（３４）に摺接して上記蓋体（２９）を上記前端開口部（２８）に圧着してこれを閉じている（図３）が、上述のようにエアタイトスリーブ（２７）が前進位置に移動したときは上記押圧リブ（３３）は上記窓孔（３５）に嵌入して蓋体（２９）は揺動し、上記前端開口部（２８）を開放して上記リフィール（１）の筆記先端（１９）を先具（５）の通孔（４）から外方に突出させることができる。そして、上述のように回転カム（１０）が回転しリフィール（１）が筆記位置に保持された状態で筆記することができる。 The front end opening (28) is inclined obliquely, and the lid (29) is swingably provided by a hinge (32) integral with the base end of the front end opening (28), A pressing rib (33) is formed on the back surface. There is a sliding surface (34) on which the pressing rib (33) slides on the inner surface of the tip (5), and the pressing rib (33) is inserted into a portion following the sliding surface (34). A window hole (35) is provided. When the air tight sleeve (27) is in the retracted position, the pressing rib (33) is slidably contacted with the sliding surface (34) to press the lid (29) against the front end opening (28). (FIG. 3), when the air tight sleeve (27) is moved to the forward position as described above, the pressing rib (33) is fitted into the window hole (35) and the lid (29) is By swinging, the front end opening (28) is opened, and the writing tip (19) of the refill (1) can be protruded outward from the through hole (4) of the tip (5). And it can write in the state where the rotating cam (10) rotated and the refill (1) was hold | maintained in the writing position as mentioned above.

リフィール（１）をノックして筆記位置から収納位置に後退させると、移動の途中で上記係止部（３０）が嵌合部（３１）に気密的に嵌合（係合）し、上記エアタイトスリーブ（２７）は該リフィール（１）の移動に伴って前進位置から後退位置に戻る。そのとき、上記押圧リブ（３３）は、上記窓孔（３５）から抜け出し、上記摺動面（３４）を摺動し、上記蓋体（２９）は該押圧リブ（３３）により上記前端開口部に圧着され、上記筆記先端（１９）は気密的に保持される。 When the refill (1) is knocked and retracted from the writing position to the storage position, the locking portion (30) is hermetically fitted (engaged) with the fitting portion (31) during the movement, and the air tight The sleeve (27) returns from the advanced position to the retracted position as the refill (1) moves. At that time, the pressing rib (33) comes out of the window hole (35) and slides on the sliding surface (34), and the lid (29) is opened by the pressing rib (33). The writing tip (19) is kept airtight.

上記のように蓋体（２９）は、エアタイトスリーブ（２７）の前端開口部（２８）を開閉するが、より確実に閉鎖するためには上記蓋体（２９）及び押圧リブ（３３）を硬質のポリプロピレン等の硬質材料で作り、上記エアタイトスリーブ（２７）の少なくとも前端開口部（２８）を、軟質のポリプロピレン等のプラスチックその他の軟質材料で作るとよい。 As described above, the lid (29) opens and closes the front end opening (28) of the air tight sleeve (27), but the lid (29) and the pressing rib (33) are hard to close more securely. The air tight sleeve (27) may be made of a hard material such as polypropylene, and at least the front end opening (28) of the air tight sleeve (27) may be made of plastic or other soft material such as soft polypropylene.

上記のような構造として、図４に示す実施例は、上記押圧リブ（３３）及び蓋体（２９）を含む筒状体のエアタイトホルダー（３６）を硬質材料で作り、一方該エアタイトホルダー（３６）を嵌入できるようエアタイトスリーブ本体（３７）を軟質材料で作り、該エアタイトホルダー（３６）をエアタイトスリーブ本体（３７）の外周に嵌着し、突起（３８）と孔（３９）及び凹凸係合部（４０）、（４１）により回り止め状態で固定してある。このようにすれば、図５に示すように硬質材料部分が軸筒の内面に摺接して動きがスム
ーズであり、かつ蓋体（２９）を前端開口部（２８）に確実に密着させることができる。 In the embodiment shown in FIG. 4 having the structure as described above, the cylindrical air tight holder (36) including the pressing rib (33) and the lid (29) is made of a hard material, while the air tight holder (36 The air tight sleeve body (37) is made of a soft material, and the air tight holder (36) is fitted on the outer periphery of the air tight sleeve body (37), and the protrusion (38), the hole (39), and the concave and convex engagement. The parts (40) and (41) are fixed in a non-rotating state. In this way, as shown in FIG. 5, the hard material portion is in sliding contact with the inner surface of the shaft tube and moves smoothly, and the lid (29) can be securely adhered to the front end opening (28). it can.

図６に示す実施例は、硬質材料で上記押圧リブ（３３）及び蓋体（２９）を含む板状のエアタイトプレート（４２）を作り、該エアタイトプレート（４２）を、軟質材料で作ったエアタイトスリーブ本体（４３）の外側面に止着して固定してある。このようにしても、図７に示すように上記蓋体（２９）により前端開口部（２８）を確実にかつ弾性的に開閉することができる。 In the embodiment shown in FIG. 6, a plate-like air tight plate (42) including the pressing rib (33) and the lid (29) is made of a hard material, and the air tight plate (42) is made of a soft material. It is fixed to the outer surface of the sleeve body (43). Even in this case, as shown in FIG. 7, the front end opening (28) can be reliably opened and closed by the lid (29).

上記のように硬質材料と軟質材料によりエアタイトスリーブをパーツ化すると、硬質部で摺動の耐久性を向上させ、軟質部で気密性を向上することができる。また、硬質部が軟質部を弾性変形をさせつつ密着するので、蓋体の押圧力やリフィールを後方へ付勢するばね（８）の力を弱くすることも可能となり、軟質部に多少の寸法のバラツキが生じても柔軟性の材料を選択することにより寸法のバラツキを吸収することができる。 When the air tight sleeve is made into a part by using a hard material and a soft material as described above, the sliding durability can be improved at the hard portion, and the air tightness can be improved at the soft portion. In addition, since the hard portion is in close contact with the soft portion while elastically deforming, it is possible to weaken the pressing force of the lid and the force of the spring (8) that urges the refill backward, and the soft portion has some dimensions. Even if this variation occurs, the variation in dimensions can be absorbed by selecting a flexible material.

本発明の一実施例を示す断面図。Sectional drawing which shows one Example of this invention. 回転カムの正面図。The front view of a rotation cam. リフィールを収納位置に移動する際の説明図。Explanatory drawing at the time of moving a refill to a storage position. エアタイトスリーブの構造の一例を示す説明図。Explanatory drawing which shows an example of the structure of an air tight sleeve. 図４に示すエアタイトスリーブの作動状態を示す説明図。Explanatory drawing which shows the operating state of the air tight sleeve shown in FIG. エアタイトスリーブの構造の他の一例を示す説明図。Explanatory drawing which shows another example of the structure of an air tight sleeve. 図６に示すエアタイトスリーブの作動状態を示す説明図。Explanatory drawing which shows the operating state of the air tight sleeve shown in FIG.

Explanation of symbols

１リフィール
３軸筒
６ストッパー
８ばね
９外カム
１０回転カム
１７案内カム
２４緩衝部材
２５緩衝片
２７エアタイトスリーブ
２８前端開口部
２９蓋体
３３押圧リブ
３５窓孔 DESCRIPTION OF SYMBOLS 1 Refill 3 Shaft cylinder 6 Stopper 8 Spring 9 Outer cam 10 Rotating cam 17 Guide cam 24 Buffer member 25 Buffer piece 27 Air tight sleeve 28 Front end opening 29 Cover body 33 Pressing rib 35 Window hole

Claims

An outer cam which is provided in the shaft cylinder and which is formed with alternating deep cam grooves and shallow cam grooves extending in the axial direction;
A rotating cam that is housed in the outer cam so as to be axially movable and rotatable, and has a protrusion that can engage with the cam groove of the outer cam, and has a front end cam surface formed on the front portion ;
A refill connected to the rotating cam and biased backward;
A guide cam provided in front of the rotating cam and having a cam surface engageable with a front end cam surface of the rotating cam so as to rotate the rotating cam when a protrusion of the rotating cam is disengaged from a cam groove of the outer cam ; ,
A stopper provided at the rear of the outer cam to prevent the rotating cam from retreating when a protrusion of the rotating cam engages with a deep cam groove of the outer cam ;
A writing instrument comprising a buffer member provided at a rear end of the rotating cam so as to reduce an impact when contacting the stopper .

The writing instrument according to claim 1, wherein the rotating cam is made of a plastic material, and the buffer member is an extensible buffer piece formed integrally with the rotating cam.

An air tight sleeve is provided in the shaft cylinder so as to be movable back and forth so as to surround the writing tip of the refill, and a lid is formed at the front end of the air tight sleeve so as to open and close the front end opening of the air tight sleeve. A pressing rib is provided in the shaft cylinder so that the lid can be opened when the air tight sleeve moves forward, and the lid is moved to the closed position when the air tight sleeve moves backward. A sliding surface on which the pressing rib slides is formed on the inner surface of the shaft cylinder, the pressing rib and the lid are formed of a hard material such as a hard plastic, and at least the front end opening of the air tight sleeve is a soft plastic, The writing instrument according to claim 1, wherein the writing instrument is made of a soft material such as an elastomer.

The air tight sleeve comprises an air tight sleeve body made of a soft material so that it can fit the air tight holder and the air tight holder which is formed in a cylindrical shape including the pressing rib and the cover, above the outer periphery of the air tight sleeve body The writing instrument according to claim 3, wherein the writing instrument is configured by fitting and fixing an air tight holder.

The air tight sleeve comprises an air tight sleeve body was created is a soft material so that the air tight plate and the air tight plate formed in a plate shape can fastened containing the pressing rib and the lid, the outer surface of the airtight sleeve body The writing instrument according to claim 3, wherein the air tight plate is fixed to the writing instrument.