JP4209383B2 - Writing instrument - Google Patents

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JP4209383B2
JP4209383B2 JP2004368611A JP2004368611A JP4209383B2 JP 4209383 B2 JP4209383 B2 JP 4209383B2 JP 2004368611 A JP2004368611 A JP 2004368611A JP 2004368611 A JP2004368611 A JP 2004368611A JP 4209383 B2 JP4209383 B2 JP 4209383B2
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shaft
rear shaft
ring
refill
front shaft
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JP2006175618A (en
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浩康 河野
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セーラー万年筆株式会社
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Description

本発明は、前軸に対して後軸を相対的に回転させるとカム機構の作用によりレフィールが前後進し、レフィールのペン体が前軸の先端開口から出没する回転カム式の筆記具に関するものである。   The present invention relates to a rotary cam-type writing instrument in which when a rear shaft is rotated relative to a front shaft, a refill moves forward and backward by the action of a cam mechanism, and a pen body of the refill protrudes and disappears from a front end opening of the front shaft. is there.

筆記具、例えばボールペン、ことに高級なボールペンにおいては、後軸の先端開口が前軸の尾端部を覆うようにして回転可能に接続された前軸と後軸からなる軸筒内に1本のボールペンレフィールとカム機構を配置し、前軸に対して後軸を相対的に回転させるとカム機構の作用によりボールペンレフィールが前後進し、ボールペンレフィールのペン体が前軸の先端開口から出没するものが数多く実用化されている。そして、高級ボールペンなるが故に、前軸に対して後軸を相対的に回転させたときのフィーリングが非常に重要になる。つまり、高級感を出すためには、回転時の前軸と後軸の摺動抵抗が大き過ぎず、かつ小さ過ぎずに適度の摺動抵抗でスムーズに回転する必要がある。   In a writing instrument, for example, a ballpoint pen, particularly a high-quality ballpoint pen, one end is provided in a shaft cylinder composed of a front shaft and a rear shaft that are rotatably connected so that a front end opening of the rear shaft covers a tail end portion of the front shaft. When the ballpoint pen feel and cam mechanism are arranged and the rear axis is rotated relative to the front axis, the ballpoint refill moves forward and backward by the action of the cam mechanism, and the pen body of the ballpoint refill appears and disappears from the front opening of the front axis Have been put to practical use. And since it is a high-quality ballpoint pen, the feeling when the rear shaft is rotated relative to the front shaft becomes very important. In other words, in order to give a high-class feeling, the sliding resistance of the front shaft and the rear shaft at the time of rotation is not too large, and it is necessary to smoothly rotate with an appropriate sliding resistance without being too small.

そこで、回転時の前軸と後軸の摺動抵抗が大き過ぎず、かつ小さ過ぎずに適度の摺動抵抗でスムーズに回転させるために、後軸の先端部内周面と前軸の尾端部外周面との摺動部分に軟弾性体からなるOリングを介在させ、後軸の先端部内周面が前軸の尾端部外周面に固定されたOリングに摺接して回転するようにすることが行われる。つまり、Oリングは後軸の先端部内周面と前軸の尾端部外周面に圧接した状態で配置される。   Therefore, in order to smoothly rotate the front shaft and the rear shaft with a suitable sliding resistance without causing the sliding resistance of the front shaft and the rear shaft to be too small and not too small, An O-ring made of a soft elastic body is interposed in the sliding part with the outer peripheral surface of the part so that the inner peripheral surface of the tip part of the rear shaft rotates in sliding contact with the O-ring fixed to the outer peripheral surface of the tail end part of the front shaft. To be done. That is, the O-ring is arranged in a state of being in pressure contact with the inner peripheral surface of the tip end portion of the rear shaft and the outer peripheral surface of the tail end portion of the front shaft.

しかしながら、後軸や前軸、およびOリングに寸法のばらつきがあるために、筆記具として組み立てたときに、Oリングに加わる圧接力にもばらつきが生じる。このため、回転時の摺動抵抗にばらつきが生じ、筆記具によっては所期の摺動抵抗が得られず、高級感が阻害される不具合がある。   However, since there are variations in dimensions of the rear shaft, the front shaft, and the O-ring, the pressure contact force applied to the O-ring also varies when assembled as a writing instrument. For this reason, the sliding resistance at the time of rotation varies, and depending on the writing instrument, the desired sliding resistance cannot be obtained, and there is a problem that the sense of quality is hindered.

そこで本発明は、前軸に対して後軸を相対的に回転させたときに、摺動抵抗のばらつきが少なくてスムーズに回転し、高級感を出すのに適した回転カム式の筆記具を提供することを目的とする。   Therefore, the present invention provides a rotating cam type writing instrument suitable for producing a high-class feeling with little variation in sliding resistance when the rear shaft is rotated relative to the front shaft. The purpose is to do.

かかる目的を達成するために、本発明は、前軸と後軸からなる軸筒内にレフィールおよびカム機構が配置され、前軸に対して後軸を相対的に回転させるとカム機構の作用によりレフィールが前後進し、レフィールのペン体が前軸の先端開口から出没する筆記具において、前軸尾端部の外周面と後軸先端部の内面の間に軟弾性体からなるOリングを配置するとともに、前軸に対して後軸を相対的に回転させたときにOリングに摺動する後軸の内面を多角形とする。また、この後軸内面の多角形は正6角形〜正24角形であることが好ましい。   In order to achieve such an object, according to the present invention, a refill and a cam mechanism are arranged in a shaft cylinder composed of a front shaft and a rear shaft, and when the rear shaft is rotated relative to the front shaft, the cam mechanism operates. In a writing instrument in which the refill moves forward and backward and the refill pen body protrudes and retracts from the front end opening of the front shaft, an O-ring made of a soft elastic body is disposed between the outer peripheral surface of the front shaft tail end portion and the inner surface of the rear shaft front end portion. In addition, the inner surface of the rear shaft that slides on the O-ring when the rear shaft is rotated relative to the front shaft is a polygon. The polygon on the inner surface of the rear shaft is preferably a regular hexagon to a regular 24 polygon.

Oリングに摺動する後軸の内面を多角形としたので、Oリングは後軸の多角形の辺の部分で圧接されて、この多角形の隅部とOリングの間に隙間が生じる。したがって、寸法ばらつきによりOリングに対する圧接力がばらついても、圧接力に応じてOリングが弾性変形し、圧縮したことにより生じる余肉の部分が多角形の隅部とOリングの間に隙間に移動する。つまり、多角形の隅部とOリングとの間の隙間の存在により、Oリングが弾性変形し易くなり、圧接力のばらつきを吸収することかできる。したがって、摺動抵抗のばらつきが少なくなり、スムーズに回転させることができる。   Since the inner surface of the rear shaft that slides on the O-ring has a polygonal shape, the O-ring is pressed into contact with the polygonal side portion of the rear shaft, and a gap is formed between the corner of the polygon and the O-ring. Therefore, even if the pressure contact force on the O-ring varies due to dimensional variations, the O-ring elastically deforms according to the pressure contact force, and the excess portion resulting from the compression is left in the gap between the polygon corner and the O-ring. Moving. That is, due to the presence of a gap between the polygonal corner and the O-ring, the O-ring is easily elastically deformed, and variations in the pressure contact force can be absorbed. Therefore, the variation in sliding resistance is reduced, and it can be rotated smoothly.

この後軸内面の多角形が5角形以下であると、多角形の隅部とOリングとの間の隙間が大きくなるとともにOリングに摺接する分が少なくなり、スムーズに回転しにくくなる。また、24角形を超えると、多角形の隅部とOリングとの間の隙間が極めて小さくなって円形に近くなるので所期の効果を得にくくなる。   If the polygon on the inner surface of the rear shaft is not more than a pentagon, the gap between the corner of the polygon and the O-ring is increased and the amount of sliding contact with the O-ring is reduced, and smooth rotation is difficult. On the other hand, if it exceeds 24 squares, the gap between the corners of the polygon and the O-ring becomes extremely small and close to a circle, so that it is difficult to obtain the desired effect.

図面はボールペンに本発明を適用した例を示す。図1において、軸筒は回転可能に接続された前軸1と後軸2からなり、軸筒内部に1本のボールペンレフィール3およびカム5と従動部材4からなるカム機構が配置されている。前軸1は、ボールペンレフィール3先端のペン体31が出没する先端開口11を有するが、前軸1の尾端に継ぎ手12が接続されており、継ぎ手12は前軸1の一部を構成している。後軸2の尾端に尾栓8が嵌着されるとともにクリップ9が取り付けられている。   The drawing shows an example in which the present invention is applied to a ballpoint pen. In FIG. 1, a shaft cylinder is composed of a front shaft 1 and a rear shaft 2 that are rotatably connected, and a cam mechanism including a ball pen refill 3, a cam 5, and a driven member 4 is disposed inside the shaft cylinder. The front shaft 1 has a tip opening 11 through which a pen body 31 at the tip of the ballpoint pen refill 3 protrudes, and a joint 12 is connected to the tail end of the front shaft 1, and the joint 12 constitutes a part of the front shaft 1. ing. A tail plug 8 is fitted to the tail end of the rear shaft 2 and a clip 9 is attached.

円筒状のカム5が後軸2の内部に固定されている。カム5の下端縁は斜めに切裁されており、この下端縁がカム面5aである。一方、継ぎ手12には案内筒6が接続されているが、案内筒6尾端の内鍔部61がカム5の外周部に回転可能に係止している。つまり、後軸2に固定されたカム5と前軸1に接続された案内筒6が回転可能に係止することにより、前軸1と後軸2が回転可能に接続されている。内鍔部61は下側のOリング52およびスプリング53で弾発された上側のOリング51で挟圧されており、カム5と案内筒6の連結部分が上下方向にがたつかないようになっている。   A cylindrical cam 5 is fixed inside the rear shaft 2. The lower edge of the cam 5 is cut obliquely, and this lower edge is the cam surface 5a. On the other hand, the guide cylinder 6 is connected to the joint 12, but an inner collar portion 61 at the tail end of the guide cylinder 6 is rotatably locked to the outer peripheral portion of the cam 5. That is, the front shaft 1 and the rear shaft 2 are rotatably connected by the cam 5 fixed to the rear shaft 2 and the guide cylinder 6 connected to the front shaft 1 being rotatably locked. The inner flange 61 is pinched by the lower O-ring 52 and the upper O-ring 51 that is springed by the spring 53 so that the connecting portion between the cam 5 and the guide tube 6 does not rattle in the vertical direction. It has become.

例えば油性インキが充填されたボールペンレフィール3はリターンスプリング32により尾端側に弾発されており、ボールペンレフィール3の尾端面は案内筒6内に配置された従動部材4に当接している。従動部材4にはフォローア部41が形成されており、フォローア部41は案内筒6の縦方向に形成されたスリットから一部が突出している。つまり、従動部材4は案内筒6内に前後進可能、かつ回転不能の状態で配置されている。そして、カム5のカム面5aがフォローア部41に当接している。したがって、カム5が回転すると従動部材4はカム面5aのプロフィールに従って前後進する。   For example, the ballpoint pen refill 3 filled with oil-based ink is repelled toward the tail end side by a return spring 32, and the tail end surface of the ballpoint pen refill 3 is in contact with the driven member 4 disposed in the guide tube 6. A follower portion 41 is formed on the driven member 4, and a part of the follower portion 41 protrudes from a slit formed in the longitudinal direction of the guide tube 6. That is, the driven member 4 is disposed in the guide tube 6 so as to be able to move forward and backward and not to rotate. The cam surface 5 a of the cam 5 is in contact with the follower portion 41. Therefore, when the cam 5 rotates, the driven member 4 moves forward and backward according to the profile of the cam surface 5a.

前軸1と後軸2を接続したとき、後軸2の先端部内面は前軸1の尾端部および継ぎ手12を覆う状態になっているが、図2に示すように、継ぎ手12には円環状の凹溝12aが形成されている。そして、この凹溝12aに軟弾性体、例えばシリコンゴムからなるOリング7が嵌め込まれており、このOリング7が後軸2先端の内面12aに圧接している。ここで、後軸2先端の内面12aは、図3に示すように、正6角形から正24角形の間の多角形、例えば正8角形の多角形をしている。したがって、Oリング7は多角形の辺2bに圧接しているが、多角形の隅部2cにおいてはOリング7との間に少し隙間があいている。   When the front shaft 1 and the rear shaft 2 are connected, the inner surface of the front end of the rear shaft 2 covers the tail end of the front shaft 1 and the joint 12, but as shown in FIG. An annular groove 12a is formed. An O-ring 7 made of a soft elastic body, for example, silicon rubber, is fitted into the concave groove 12a. The O-ring 7 is in pressure contact with the inner surface 12a at the tip of the rear shaft 2. Here, as shown in FIG. 3, the inner surface 12 a at the tip of the rear shaft 2 has a polygon between a regular hexagon and a regular 24 polygon, for example, a regular octagon. Therefore, although the O-ring 7 is in pressure contact with the polygonal side 2b, there is a small gap between the O-ring 7 and the polygonal corner 2c.

しかして、図1に示す状態から後軸2を前軸1に対して回転させると、前述のとおり、カム5の作用により従動部材4はリターンスプリング32の弾発力に抗して前進し、図4に示すように、ボールペンレフィール3先端のペン体31が前軸1の先端開口11から突出して筆記可能になる。そして、更に後軸2を前軸1に対して回転させると、ボールペンレフィール3先端のペン体31が前軸1の先端開口11から没入し、図1の状態に戻る。このとき、後軸2先端の内面12aがOリング7に摺接するので所定の摺動抵抗でスムーズに回転するが、後軸2先端の内面12aが多角形であるので、前述のとおり、圧接力にばらつきが生じても、多角形の隅部2cではOリング7との間に少し隙間があいているので、Oリング7が弾性変形し易い。このため、寸法のばらつきによって圧接力がばらついても、圧接力に応じてOリング7が弾性変形し、圧接力のばらつきを容易に吸収することができる。   Accordingly, when the rear shaft 2 is rotated with respect to the front shaft 1 from the state shown in FIG. 1, the driven member 4 moves forward against the elastic force of the return spring 32 by the action of the cam 5 as described above. As shown in FIG. 4, the pen body 31 at the tip of the ballpoint pen refill 3 protrudes from the tip opening 11 of the front shaft 1 and can be written. When the rear shaft 2 is further rotated with respect to the front shaft 1, the pen body 31 at the tip of the ballpoint pen refill 3 is immersed from the tip opening 11 of the front shaft 1 and returns to the state shown in FIG. At this time, since the inner surface 12a at the tip of the rear shaft 2 is in sliding contact with the O-ring 7, it rotates smoothly with a predetermined sliding resistance. However, since the inner surface 12a at the tip of the rear shaft 2 is polygonal, as described above, the pressure contact force Even if variations occur, the O-ring 7 is easily elastically deformed because there is a small gap between the polygonal corner 2c and the O-ring 7. For this reason, even if the pressure contact force varies due to variations in dimensions, the O-ring 7 is elastically deformed according to the pressure contact force, and the variations in pressure contact force can be easily absorbed.

本発明実施例の正面図である。It is a front view of this invention Example. 同じく要部の断面図である。It is a sectional view of the principal part similarly. 後軸先端内面の形状の説明図である。It is explanatory drawing of the shape of a rear-axis front-end | tip inner surface. 筆記可能状態の説明図である。It is explanatory drawing of a writable state.

符号の説明Explanation of symbols

1 前軸
11 先端開口
12 継ぎ手
2 後軸
2a 後軸先端の内面
3 レフィール
31 ペン体
32 リターンスプリング
4 従動部材
41 フォローア部
5 カム
5a カム面
6 案内筒
61 内鍔部
7 Oリング
8 尾栓
9 クリップ
DESCRIPTION OF SYMBOLS 1 Front shaft 11 Front end opening 12 Joint 2 Rear shaft 2a Inner surface of rear shaft 3 Refill 31 Pen body 32 Return spring 4 Follower member 41 Follower portion 5 Cam 5a Cam surface 6 Guide tube 61 Inner flange portion 7 O ring 8 Tail plug 9 clip

Claims (2)

前軸と後軸からなる軸筒内にレフィールおよびカム機構が配置され、前軸に対して後軸を相対的に回転させるとカム機構の作用によりレフィールが前後進し、レフィールのペン体が前軸の先端開口から出没する筆記具において、
前軸尾端部の外周面と後軸先端部の内面の間に軟弾性体からなるOリングが配置されるとともに、前軸に対して後軸を相対的に回転させたときにOリングに摺動する後軸の内面が多角形であることを特徴とする筆記具。
A refill and a cam mechanism are arranged in a shaft cylinder composed of a front shaft and a rear shaft. When the rear shaft is rotated relative to the front shaft, the refill moves forward and backward by the action of the cam mechanism, and the refill pen body moves forward. In writing instruments that appear and disappear from the opening of the shaft end,
An O-ring made of a soft elastic body is disposed between the outer peripheral surface of the front shaft tail end portion and the inner surface of the rear shaft tip portion, and when the rear shaft is rotated relative to the front shaft, A writing instrument characterized in that the inner surface of the sliding rear shaft is polygonal.
前記後軸内面の多角形が正6角形〜正24角形であることを特徴とする請求項1記載の筆記具。   2. The writing instrument according to claim 1, wherein the polygon on the inner surface of the rear shaft is a regular hexagon to a regular 24 polygon.
JP2004368611A 2004-12-21 2004-12-21 Writing instrument Expired - Fee Related JP4209383B2 (en)

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JP2004368611A JP4209383B2 (en) 2004-12-21 2004-12-21 Writing instrument

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Application Number Priority Date Filing Date Title
JP2004368611A JP4209383B2 (en) 2004-12-21 2004-12-21 Writing instrument

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JP2006175618A JP2006175618A (en) 2006-07-06
JP4209383B2 true JP4209383B2 (en) 2009-01-14

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6382507B2 (en) * 2013-12-06 2018-08-29 三菱鉛筆株式会社 Writing instrument
JP6812250B2 (en) * 2017-01-23 2021-01-13 三菱鉛筆株式会社 Rotary feeding type writing tool

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09164794A (en) * 1995-10-12 1997-06-24 Kotobuki:Kk Double chuck type mechanical pencil
JP2002336042A (en) * 2001-05-14 2002-11-26 Suzuno Kasei Kk Bar-shaped cosmetic material container
JP2004181001A (en) * 2002-12-04 2004-07-02 Suzuno Kasei Kk Stick-shaped cosmetic material feeding container

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