JP4847290B2

JP4847290B2 - Pressurized writing instrument

Info

Publication number: JP4847290B2
Application number: JP2006308952A
Authority: JP
Inventors: 洋酒井
Original assignee: Zebra Co Ltd
Current assignee: Zebra Co Ltd
Priority date: 2006-11-15
Filing date: 2006-11-15
Publication date: 2011-12-28
Anticipated expiration: 2026-11-15
Also published as: JP2008120033A

Description

本発明は、強制加圧により筆記部から吐出される筆記液の流量を適量に維持するようにした加圧式筆記具に関し、特に、修正ペンとして好適な加圧式筆記具に関するものである。 The present invention relates to a pressure-type writing instrument in which a flow rate of writing liquid discharged from a writing unit by forced pressurization is maintained at an appropriate level, and particularly to a pressure-type writing instrument suitable as a correction pen.

従来、この種の筆記具には、例えば特許文献１に記載されているように、軸筒（１）内に、筆記液（インキｉ）を充填した略管状のリフィール（２）と、該リフィール（２）の後端側を覆うようにして設けられたホルダー（３）と、該ホルダー（３）を覆うようにして該ホルダー（３）の後方側に加圧空間部を形成するシリンダー（Ｎ４）とを備え、外部操作によりシリンダー（Ｎ４）を進退させることで前記加圧空間部を加減圧するようにしたものがある。 Conventionally, as described in Patent Document 1, for example, this type of writing instrument includes a substantially tubular refill (2) filled with a writing liquid (ink i) in a shaft tube (1), and the refill ( 2) A holder (3) provided so as to cover the rear end side, and a cylinder (N4) which forms a pressure space portion on the rear side of the holder (3) so as to cover the holder (3) And pressurizing and depressurizing the pressurizing space by advancing and retracting the cylinder (N4) by an external operation.

しかしながら、上記従来技術によれば、リフィール（２）の後端側において、ホルダー（３）やシリンダー（Ｎ４）が径方向へ重ね合わせられる構造であるため、該構造の外径が比較的大きくなり、ひいては該構造を収納する軸筒の軸径が大きくなってしまうという問題があった。 However, according to the above prior art, since the holder (3) and the cylinder (N4) are superposed in the radial direction on the rear end side of the refill (2), the outer diameter of the structure becomes relatively large. As a result, there has been a problem that the shaft diameter of the shaft cylinder for housing the structure becomes large.

また、他の従来技術としては、例えば特許文献２に記載されているように、リフィール（インキ充填管２１）の後端開口部に加圧ポンピング機構（３０）を差し込み、これらリフィール及び加圧ポンピング機構を軸筒（グリップハウジング１）内に収納するようにした筆記具がある。 As another conventional technique, for example, as described in Patent Document 2, a pressure pumping mechanism (30) is inserted into a rear end opening of a refill (ink filling tube 21), and these refill and pressure pumping are inserted. There is a writing instrument in which the mechanism is accommodated in a shaft cylinder (grip housing 1).

しかしながら、後者の従来技術によれば、リフィールの後端開口部に加圧ポンピング機構を差し込む構造であるため、リフィール自体の外径が大きくなり、ひいては、軸筒外径が大きくなってしまう。
その上、後者の従来技術では、加圧ポンピング機構により加圧される空間の容積が比較的小さいため、リフィール内の筆記液（インキＷ）が筆記により吐出されると、前記空間の空気が減圧し、加圧効果が消失してしまう。
より詳細に説明すれば、加圧ポンピング機構（３０）による加圧は、特許文献２の図５に示す状態から図６に示す状態まで行われる。この範囲内では、通気溝（３３）が塞がれた後に、顎部（３５）と筆記液（インキＷ）との間の僅かな空間しか加圧されない。
なお、ガイドブッシュ（３１）よりも後方側の空間は、抱持部（１３）内周面側の隙間や、可動部材（３２）後側の隙間によって外部に連通しているため、加圧されることはない。
また、後者の従来技術において、加圧される空間を大きくするためには、リフィール径を拡大したり、リフィール内の筆記液（インキＷ）の充填量を減らしたりして、筆記液（インキＷ）後部の空間を増加する必要が生じる。
特開２００５−１３８３５６号公報特開２０００−３３５１７３号公報 However, according to the latter prior art, since the pressure pumping mechanism is inserted into the rear end opening of the refill, the outer diameter of the refill itself is increased, and as a result, the outer diameter of the shaft cylinder is increased.
In addition, since the volume of the space pressurized by the pressure pumping mechanism is relatively small in the latter prior art, when the writing liquid (ink W) in the refill is ejected by writing, the air in the space is depressurized. Then, the pressurizing effect disappears.
If it demonstrates in detail, the pressurization by a pressurization pumping mechanism (30) will be performed from the state shown in FIG. 5 of patent document 2 to the state shown in FIG. Within this range, only a small space between the jaw (35) and the writing liquid (ink W) is pressurized after the ventilation groove (33) is closed.
The space on the rear side of the guide bush (31) communicates with the outside through a clearance on the inner peripheral surface side of the holding portion (13) and a clearance on the rear side of the movable member (32), and therefore is pressurized. Never happen.
In the latter prior art, in order to enlarge the space to be pressurized, the refill diameter is increased or the filling amount of the writing liquid (ink W) in the refill is reduced, so that the writing liquid (ink W ) The rear space needs to be increased.
JP 2005-138356 A JP 2000-335173 A

本発明は上記従来事情に鑑みてなされたものであり、その課題とする処は、軸筒径を小さくすることができる上、筆記液の吐出に伴って加圧効果が低減するのを防ぐことができる加圧式筆記具を提供することにある。 The present invention has been made in view of the above-described conventional circumstances, and the problem to be solved is that it is possible to reduce the shaft tube diameter and to prevent the pressurization effect from being reduced as the writing liquid is discharged. The object is to provide a pressure-type writing instrument that can be used.

上記課題を解決するために第一の発明は、前端側の筆記部と後端側の開口部との間に筆記液が充填された略管状のリフィールを装着可能なリフィール装着部と、装着された際の前記リフィールに対し後方から接近離間可能なピストン部材とを、軸筒内に備えるとともに、前記ピストン部材を外部操作によって軸方向へ進退させる進退機構を備え、装着された際の前記リフィール内の筆記液と前記ピストン部材との間に、前記ピストン部材の前進により圧縮される加圧空間部を形成するようにした加圧式筆記具であって、前記リフィール装着部に、前記軸筒の内周面と装着された際の前記リフィールの外周面との間を気密するリフィール気密手段を設け、前記ピストン部材の外周側に、前記ピストン部材に相対し軸方向へ所定量移動可能であって、且つ外周部を前記軸筒の内周面に対し気密に接触させるように環状気密部材を設け、同ピストン部材における前記環状気密部材よりも後方側に、前記環状気密部材に対し全周にわたって当接可能な気密当接部を設け、前記環状気密部材と前記気密当接部との間が離間した際に、前記気密当接部よりも遠心方向側で軸筒外に連通するとともに、同気密当接部よりも求心方向側で前記加圧空間部に連通する通気路を設けたことを特徴とする。 In order to solve the above-mentioned problem, a first invention is provided with a refill mounting portion capable of mounting a substantially tubular refill filled with writing liquid between a writing portion on the front end side and an opening on the rear end side. A piston member that can be approached and separated from the rear of the refill at the time of rearward movement, and a forward / backward mechanism for moving the piston member in the axial direction by an external operation. Between the writing fluid and the piston member, and a pressurizing writing instrument configured to form a pressurizing space portion compressed by advancing the piston member, wherein the refill mounting portion has an inner periphery of the shaft cylinder. A refill airtight means for airtightness between the surface and the outer peripheral surface of the refill when attached is provided, and a predetermined amount can be moved in the axial direction on the outer peripheral side of the piston member relative to the piston member. In addition, an annular airtight member is provided so that the outer peripheral portion is in airtight contact with the inner peripheral surface of the shaft cylinder, and the piston member is disposed on the rear side of the annular airtight member over the entire circumference. An airtight contact portion that can be contacted is provided, and when the annular airtight member and the airtight contact portion are separated from each other, the airtight contact portion communicates with the outside of the shaft cylinder on the centrifugal direction side with respect to the airtight contact portion. An air passage that communicates with the pressurizing space is provided on the centripetal direction side of the contact portion.

更に、第二の発明によれば、上記ピストン部材は、底部を後方へ向けた略有底筒状に形成されることで、その内部空間を、上記加圧空間部に連通する補助加圧空間部としていることを特徴とする。 Further, according to the second invention, the piston member is formed in a substantially bottomed cylindrical shape with the bottom portion directed rearward, so that the internal pressurizing space communicates with the pressurizing space portion. It is characterized by being part.

更に、第三の発明によれば、上記リフィール装着部を軸方向へ移動可能に備えることで、該リフィール装着部に装着された際のリフィールの筆記部を軸筒前端から出没させるようにした加圧式筆記具であって、前記リフィールに相対して上記ピストン部材を後方へ付勢する第一付勢部材と、上記軸筒に相対して前記リフィールを後方へ付勢するとともに第一付勢部材よりも付勢力の大きい第二付勢部材とを備え、上記ピストン部材は、筆記部没入状態の前記リフィールから離間した位置と、同リフィールを押動してその筆記部を軸筒前端から突出させた位置との間で進退するように設けられ、上記進退機構は、筆記部を突出させるように前進した上記ピストン部材を係止し、この係止状態を、再度外部からのノック操作があった際に解除するように構成されていることを特徴とする。 According to a third aspect of the present invention, the refill mounting portion is provided so as to be movable in the axial direction, so that the writing portion of the refill when mounted on the refill mounting portion is projected and retracted from the front end of the shaft cylinder. From a first biasing member that biases the piston member rearward relative to the refill, and a first biasing member that biases the refill rearward relative to the shaft tube. A second biasing member having a large biasing force, and the piston member is spaced from the refill in the writing portion immersion state, and the writing portion is pushed to project the writing portion from the front end of the shaft cylinder. The advance / retreat mechanism locks the piston member that has moved forward so as to project the writing part, and this locked state is re-established when there is a knocking operation from the outside again. Release to Characterized in that it is configured urchin.

なお、上記発明は、上記リフィールを装着可能な構成であればよく、すなわち上記リフィールを具備することを必須の構成要件としていない。
したがって、本発明に係わる具体例としては、上記リフィールを具備していない態様であってもよいし、上記リフィールを予め装着した態様であってもよい。 In addition, the said invention should just be the structure which can mount | wear with the said refill, ie, not having the said refill as an essential structural requirement.
Therefore, as a specific example according to the present invention, an aspect in which the refill is not provided may be used, or an aspect in which the refill is attached in advance may be used.

本発明は、以上説明したように構成されているので、以下に記載されるような作用効果を奏する。
第一の発明によれば、従来例のように加圧のための部材をリフィールの周囲に具備することなく、加圧のための部材をリフィールよりも後方に配置する構成としているため、軸筒径を小さくすることができ、ひいては、スリムな外観の加圧式筆記具を提供することができる。
更に、装着された際のリフィール内の筆記液とリフィール後方側に配置されるピストン部材との間に、加圧空間部を確保する構成であるため、その加圧空間部の容積を比較的大きく確保することができる。
そのため、筆記による筆記部からの筆記液の吐出に伴って加圧空間部の容積が増加した場合でも、加圧空間部の減圧を比較的少なくすることができる。
したがって、筆記中における加圧効果の低減を防ぐことができ、ひいては、筆記部からの筆記液の吐出状態を、良好に維持することができる。 Since the present invention is configured as described above, the following effects can be obtained.
According to the first invention, since the member for pressurization is arranged behind the refill without providing the member for pressurization around the refill as in the conventional example, the shaft cylinder The diameter can be reduced, and as a result, a pressure-type writing instrument with a slim appearance can be provided.
Further, since the pressurization space is secured between the writing liquid in the refill when it is mounted and the piston member disposed on the rear side of the refill, the volume of the pressurization space is relatively large. Can be secured.
Therefore, even when the volume of the pressurizing space portion increases with the writing liquid being discharged from the writing portion by writing, the decompression of the pressurizing space portion can be relatively reduced.
Therefore, it is possible to prevent the pressurization effect from being reduced during writing, and thus to maintain a good discharge state of the writing liquid from the writing unit.

更に、第二の発明によれば、加圧空間部に連通する補助加圧空間部によって、加圧される空間部の容積を一層大きく確保することができる。
よって、筆記部からの筆記液の吐出に伴う減圧を一層少なくすることができ、ひいては、筆記中における加圧効果の低減を更に少なくし、筆記部からの筆記液の吐出状態を、より長い時間良好に維持することができる。 Furthermore, according to 2nd invention, the volume of the space part pressurized can be ensured still more by the auxiliary | assistant pressurization space part connected to a pressurization space part.
Therefore, it is possible to further reduce the pressure reduction associated with the discharge of the writing liquid from the writing part, and further reduce the reduction of the pressurizing effect during the writing, and the discharge state of the writing liquid from the writing part is longer. It can be maintained well.

更に、第三の発明によれば、筆記部を突出させるノック操作により、加圧空間部が加圧され、その加圧状態が、筆記部を没入させる再ノック操作により解除される。
すなわち、筆記部を出没させる操作と、加圧空間部を加減圧する操作とが、同一のノック操作に連動しているため、使い勝手が良好である。 Furthermore, according to the third invention, the pressurizing space is pressurized by a knocking operation for projecting the writing part, and the pressurized state is released by a re-knocking operation for immersing the writing part.
That is, since the operation of moving the writing part up and down and the operation of increasing and decreasing the pressure space part are linked to the same knocking operation, the usability is good.

以下、本発明の実施の形態を図面に基づいて説明する。
本発明に係わる加圧式筆記具はボールペンや修正ペン等として構成可能であるが、本実施の形態では、特に好ましい態様として、修正ペンとして構成された加圧式筆記具１について説明する。
なお、本明細書中において、「前」とは筆記部２２方向（図１における左方向）を意味し、「後」とは筆記部２２方向に対する逆方向を意味するものとする。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Although the pressure-type writing instrument concerning this invention can be comprised as a ball-point pen, a correction pen, etc., in this Embodiment, the pressure-type writing instrument 1 comprised as a correction pen is demonstrated as a particularly preferable aspect.
In the present specification, “front” means the writing part 22 direction (left direction in FIG. 1), and “rear” means the opposite direction to the writing part 22 direction.

加圧式筆記具１は、軸筒１０内に、修正液である筆記液２３を充填したリフィール２０と、該リフィール２０の後端側を装着して該リフィール２０の外周面と軸筒１０の内周面との間を気密するリフィール装着部３０と、リフィール２０に対し後方から接近離間可能なピストン部材４０と、リフィール２０に相対してピストン部材４０を後方へ付勢する第一付勢部材５０と、軸筒１０に相対してリフィール２０を後方へ付勢する第二付勢部材６０と、ピストン部材４０を外部操作によって軸方向へ進退させる進退機構７０とを備え、リフィール２０内の筆記液２３とピストン部材４０との間に加圧空間部Ｓ１を確保し、更にピストン部材４０内に補助加圧空間部Ｓ２を確保している。 The pressure-type writing instrument 1 is equipped with a refill 20 in which a writing liquid 23 as a correction liquid is filled in a shaft cylinder 10, and a rear end side of the refill 20 is attached to the outer peripheral surface of the refill 20 and the inner periphery of the shaft cylinder 10. A refill mounting portion 30 that is hermetically sealed to the surface, a piston member 40 that can be approached and separated from the refill 20 from behind, and a first biasing member 50 that biases the piston member 40 rearward relative to the refill 20; The second urging member 60 that urges the refill 20 rearward relative to the shaft cylinder 10 and the advance / retreat mechanism 70 that advances and retracts the piston member 40 in the axial direction by an external operation are provided, and the writing liquid 23 in the refill 20 is provided. A pressure space S1 is secured between the piston member 40 and an auxiliary pressure space S2 is secured in the piston member 40.

軸筒１０は、先口部１１ａ及びグリップ部１１ｂを構成している前軸１１と、該前軸１１よりも後方側の部分を構成している後軸１２とからなり、該後軸１２よりも更に後端側に後述する進退機構７０を嵌合している。 The shaft cylinder 10 includes a front shaft 11 constituting a front opening portion 11a and a grip portion 11b, and a rear shaft 12 constituting a portion on the rear side of the front shaft 11, and from the rear shaft 12. Further, an advancing / retreating mechanism 70 described later is fitted on the rear end side.

前軸１１は、前端側に先細状の先口部１１ａを有するとともに、該先口部１１ａよりも後部側にグリップ部１１ｂを有する略筒状に形成されている。 The front shaft 11 is formed in a substantially cylindrical shape having a tapered leading end portion 11a on the front end side and a grip portion 11b on the rear side from the leading end portion 11a.

また、後軸１２は、前軸１１の後端側に螺合された略円筒状の部材である。
この後軸１２は、その内周面に、規制段部１２ａを有する。規制段部１２ａは、後述するリフィール装着部３０に係合して、該リフィール装着部３０の後方への移動を規制するように、前方側を拡径した段部である。
後軸１２おいて、規制段部１２ａよりも後方側の円筒状の内面は、後述するリフィール装着部３０およびピストン部材４０を摺接させるための面である。 The rear shaft 12 is a substantially cylindrical member that is screwed to the rear end side of the front shaft 11.
The rear shaft 12 has a regulation step portion 12a on its inner peripheral surface. The restriction step portion 12a is a step portion whose diameter is increased on the front side so as to engage with a refill attachment portion 30 described later and restrict the rearward movement of the refill attachment portion 30.
In the rear shaft 12, the cylindrical inner surface on the rear side of the regulation step portion 12 a is a surface for slidingly contacting a refill mounting portion 30 and a piston member 40 described later.

なお、軸筒１０は、上記前軸１１と上記後軸１２を一体にした部材や、先口部を別体にした部材などであってもよい。 The shaft tube 10 may be a member in which the front shaft 11 and the rear shaft 12 are integrated, or a member in which the front end portion is separated.

また、リフィール２０は、略円筒状の筆記液収容管２１と、該筆記液収容管２１の前端側に接続された筆記部２２と、筆記液収容管２１内の前側に充填された筆記液２３と、該筆記液２３の最後端部に接するように充填されたグリス状のフォロア２４とからなる。なお、他例としては、前記グリス状のフォロア２４内に固体状のフォロア棒を設けることも可能である。 The refill 20 includes a substantially cylindrical writing liquid storage tube 21, a writing unit 22 connected to the front end side of the writing liquid storage tube 21, and a writing liquid 23 filled in the front side of the writing liquid storage tube 21. And a grease-like follower 24 filled so as to be in contact with the end of the writing liquid 23. As another example, a solid follower rod can be provided in the grease-like follower 24.

筆記部２２は、最先端部に回動自在に転写ボールを保持し露出させた所謂ボールペンチップである。 The writing unit 22 is a so-called ball-point pen tip in which a transfer ball is rotatably held at the most distal portion and exposed.

また、筆記液２３は、本実施の形態の一例によれば白色の修正液であり、前記転写ボールを介してスムーズに吐出されるように、その粘度が適宜に設定されている。
この筆記液２３の粘度について詳細に説明すれば、Pear Physica社製の粘弾性測定器を用い、コーン径φ５０ｍｍ、コーン角度２°、温度２０°Ｃとした場合に、定常回転における剪断速度が１／ｓのときの粘度の値が、０．８〜５００Ｐａ・ｓの範囲内、剪断速度が１００／ｓのときに、該筆記液２３の粘度の値が、０．０２〜１３０Ｐａ・ｓの範囲内とされる。 Further, the writing liquid 23 is a white correction liquid according to an example of the present embodiment, and the viscosity thereof is appropriately set so as to be smoothly discharged through the transfer ball.
The viscosity of the writing solution 23 will be described in detail. When a viscoelasticity measuring device manufactured by Pear Physica is used and the cone diameter is 50 mm, the cone angle is 2 °, and the temperature is 20 ° C., the shear rate in steady rotation is 1. The viscosity value at / s is in the range of 0.8 to 500 Pa · s, and when the shear rate is 100 / s, the viscosity value of the writing solution 23 is in the range of 0.02 to 130 Pa · s. It is assumed to be inside.

また、フォロア２４は、筆記液２３の減少に追従するグリース状の流体であり、筆記液２３との相溶性が無く且つ筆記液２３の蒸発を防止する特性を有している。 The follower 24 is a grease-like fluid that follows the decrease in the writing liquid 23, has no compatibility with the writing liquid 23, and has a characteristic of preventing the writing liquid 23 from evaporating.

また、リフィール装着部３０は、リフィール２０の筆記液収容管２１後端側を、環状に装着可能な略円筒状の部材であり、その前端側に後軸１２の規制段部１２ａに係止する凸部３１を有し、装着されるリフィール２０と一体的に進退可能である。
そして、このリフィール装着部３０は、その後端側外周面に環状凹部３２を形成し、該環状凹部３２内にリフィール用環状気密部材３３を内在するとともに、該リフィール装着部３０の内周面をリフィール２０の筆記液収容管２１後端側に嵌合密接させることで、装着されるリフィール２０の外周面と軸筒１０内周面との間を気密するリフィール気密手段を構成している。
なお、後軸１２の規制段部１２ａおよび凸部３１は、図示例によれば軸筒１０の周方向へわたる環状に形成されているが、他例としては、軸筒１０の周方向において部分的な凹凸部であってもよい。 The refill mounting portion 30 is a substantially cylindrical member that can be mounted in an annular shape on the rear end side of the writing liquid storage tube 21 of the refill 20, and is locked to the regulation step portion 12 a of the rear shaft 12 on the front end side. It has the convex part 31 and can advance / retreat integrally with the refill 20 to be mounted.
The refill mounting portion 30 has an annular recess 32 formed on the outer peripheral surface on the rear end side, and an annular airtight member 33 for refill is included in the annular recess 32, and the inner peripheral surface of the refill mounting portion 30 is refilled. The refill airtight means for sealing the space between the outer peripheral surface of the refill 20 to be mounted and the inner peripheral surface of the shaft cylinder 10 is configured by fitting and intimately contacting the rear end side of the 20 writing liquid storage tube 21.
In addition, although the regulation step part 12a and the convex part 31 of the rear shaft 12 are formed in an annular shape extending in the circumferential direction of the shaft tube 10 according to the illustrated example, as another example, a part in the circumferential direction of the shaft tube 10 is provided. An uneven portion may be used.

リフィール用環状気密部材３３は、上記環状凹部３２の底面に密接するとともに、軸筒１０の後軸１２内周面に密接する環状の弾性体であり、例えばゴム製Ｏリング等とされる。 The refill annular hermetic member 33 is an annular elastic body that is in close contact with the bottom surface of the annular recess 32 and in close contact with the inner peripheral surface of the rear shaft 12 of the shaft cylinder 10, and is, for example, a rubber O-ring.

したがって、上記構成のリフィール装着部３０によれば、リフィール２０の外周面と軸筒１０内周面との間が気密された状態で、リフィール２０が前後方向へ移動可能となり、更に、リフィール２０の後方への移動が所定位置で規制されることになる。
なお、上記リフィール気密手段（換言すればリフィール２０の周囲を気密する構成）は、上記リフィール装着部３０を用いた態様以外であってもよく、例えば、リフィール２０外周に直接的に、弾性体からなる気密部材を設けた構成とすることも可能である。 Therefore, according to the refill mounting portion 30 configured as described above, the refill 20 can be moved in the front-rear direction in a state in which the space between the outer peripheral surface of the refill 20 and the inner peripheral surface of the shaft cylinder 10 is hermetically sealed. The backward movement is restricted at a predetermined position.
Note that the refill airtight means (in other words, the structure that seals the periphery of the refill 20) may be other than the aspect using the refill mounting portion 30, for example, directly from the elastic body to the outer periphery of the refill 20 It is also possible to provide a structure provided with an airtight member.

また、ピストン部材４０は、底部４０ａを後方へ向けた略有底筒状に形成されることで、その内部空間を、上記加圧空間部Ｓ１に連通する補助加圧空間部Ｓ２としている。
そして、このピストン部材４０は、その前端側部分の外径が拡径された大径部４０ｂを有し、この大径部４０ｂの外周面に環状凹部４１が形成されて、該環状凹部４１内に、ピストン部材用環状気密部材４２が挿入されている。
なお、図示例のピストン部材４０は、一部品として構成してあるが、生産性等を向上するために二以上の部品から構成するようにしてもよい。 Further, the piston member 40 is formed in a substantially bottomed cylindrical shape with the bottom portion 40a facing rearward, so that the internal space serves as an auxiliary pressurizing space portion S2 communicating with the pressurizing space portion S1.
The piston member 40 has a large-diameter portion 40b in which the outer diameter of the front end side portion is enlarged, and an annular recess 41 is formed on the outer peripheral surface of the large-diameter portion 40b. Further, an annular airtight member 42 for the piston member is inserted.
In addition, although the piston member 40 of the example of illustration is comprised as one component, in order to improve productivity etc., you may make it comprise from two or more components.

ピストン部材用環状気密部材４２は、外径部が後軸１２内周面に接触するとともに内径部が環状凹部４１の底部４１ｂとの間に隙間を有する状態で、環状凹部４１内で軸方向へ移動可能となるように設けられた環状の弾性体であり、例えばゴム製Ｏリング等とされる。
このピストン部材用環状気密部材４２の外表面には、環状凹部４１内での軸方向への移動を良好にするために、潤滑剤が塗布されている。 The annular airtight member 42 for the piston member has an outer diameter portion in contact with the inner peripheral surface of the rear shaft 12 and an inner diameter portion having a gap with the bottom 41b of the annular recess 41 in the axial direction within the annular recess 41. An annular elastic body provided so as to be movable, for example, a rubber O-ring.
A lubricant is applied to the outer surface of the piston member annular airtight member 42 in order to improve the axial movement in the annular recess 41.

環状凹部４１内の後端面には、気密当接部４１ａが設けられている。
この気密当接部４１ａは、ピストン部材用環状気密部材４２に対し、その後方側から全周にわたって当接可能であり、図示例によれば、環状凹部４１内の平坦状の後端面とすることで、その当接性を良好にしている。 An airtight contact portion 41 a is provided on the rear end surface in the annular recess 41.
The airtight abutting portion 41a can abut against the annular airtight member 42 for the piston member over the entire circumference from the rear side. According to the illustrated example, the airtight abutting portion 41a is a flat rear end surface in the annular recess 41. Therefore, the contact property is improved.

前記気密当接部４１ａよりも遠心方向側から求心方向側にわたる範囲には、第一通気路４０ｂ１と第二通気路４０ｂ２とによって通気路が構成される。この通気路は、ピストン部材用環状気密部材４２の気密当接部４１ａへの当接により遮断され、ピストン部材用環状気密部材４２が気密当接部４１ａから離れた際には開放される。 An air passage is constituted by the first air passage 40b1 and the second air passage 40b2 in a range extending from the centrifugal direction side to the centripetal direction side relative to the airtight contact portion 41a. This air passage is blocked by the contact of the annular airtight member for piston member 42 with the airtight contact portion 41a, and is opened when the annular airtight member for piston member 42 is separated from the airtight contact portion 41a.

第一通気路４０ｂ１は、気密当接部４１ａよりも遠心方向側で、環状凹部４１内の空間を軸筒外へ連通する通路である。
より詳細に説明すれば、この第一通気路４０ｂ１は、大径部４０ｂにおける環状凹部４１よりも後側の部分の外径と、軸筒１０の内周面（詳細には後軸１２の内周面）との間の隙間によって構成される。この隙間は、ピストン部材４０の後部側外周面と軸筒１０の内周面との隙間、および後述する進退機構７０を構成する部品間の隙間等を介して、軸筒１０後方の外気に連通している。
なお、第一通気路４０ｂ１の他例としては、大径部４０ｂ後部における気密当接部４１ａよりも遠心方向側に、環状凹部４１から大径部４０ｂ後方側の空間へ連通する貫通孔や溝を形成するようにしてもよい。 The first air passage 40b1 is a passage which communicates the space in the annular recess 41 to the outside of the shaft cylinder on the centrifugal direction side with respect to the airtight contact portion 41a.
More specifically, the first air passage 40b1 includes the outer diameter of the rear portion of the large-diameter portion 40b relative to the annular recess 41, the inner peripheral surface of the shaft cylinder 10 (specifically, the inner diameter of the rear shaft 12). (Peripheral surface). This gap communicates with the outside air behind the shaft cylinder 10 via a gap between the rear outer peripheral surface of the piston member 40 and the inner peripheral surface of the shaft cylinder 10 and a gap between components constituting the advance / retreat mechanism 70 described later. is doing.
In addition, as another example of the first air passage 40b1, a through hole or a groove communicating with the space on the rear side of the large-diameter portion 40b from the annular concave portion 41 on the centrifugal direction side with respect to the airtight contact portion 41a at the rear portion of the large-diameter portion 40b. May be formed.

また、第二通気路４０ｂ２は、上記気密当接部４１ａよりも求心方向側で、環状凹部４１を加圧空間部Ｓ１に連通する通路である。
より詳細に説明すれば、この第二通気路４０ｂ２は、大径部４０ｂにおける環状凹部４１よりも前側の外周面に形成された軸方向（図１によれば左右方向）の溝によって構成されている。 The second air passage 40b2 is a passage that communicates the annular recess 41 with the pressurizing space S1 on the centripetal side of the airtight contact portion 41a.
If it demonstrates in detail, this 2nd ventilation path 40b2 is comprised by the groove | channel of the axial direction (left-right direction according to FIG. 1) formed in the outer peripheral surface ahead of the annular recessed part 41 in the large diameter part 40b. Yes.

また、ピストン部材４０における大径部４０ｂの前端面には、径方向へわたる単数もしくは複数の通気溝４０ｂ３が設けられている。
この通気溝４０ｂ３は、第二通気路４０ｂ２と加圧空間部Ｓ１及び補助加圧空間部Ｓ２とを連通する溝であり、大径部４０ｂ前端面がリフィール装着部３０後端面に当接した際（図２〜４に示す状態）に、加圧空間部Ｓ１及び補助加圧空間部Ｓ２の空気の圧力を環状凹部４１内へ伝達する。 In addition, the front end face of the large diameter portion 40b of the piston member 40 is provided with one or a plurality of ventilation grooves 40b3 extending in the radial direction.
The ventilation groove 40b3 is a groove that communicates the second ventilation path 40b2, the pressurizing space portion S1, and the auxiliary pressurizing space portion S2. When the front end surface of the large diameter portion 40b abuts the rear end surface of the refill mounting portion 30 In the state shown in FIGS. 2 to 4, the air pressure in the pressurizing space S <b> 1 and the auxiliary pressurizing space S <b> 2 is transmitted into the annular recess 41.

なお、上記第二通気路４０ｂ２の他例としては、大径部４０ｂの前部に、環状凹部４１と加圧空間部Ｓ１とを連通する貫通孔を設けるようにしてもよい。
更に、第二通気路４０ｂ２の他例としては、環状凹部４１の底部４１ｂに、径方向へ連通する貫通孔を設けることも可能である。
すなわち、この第二通気路４０ｂ２は、加圧空間部Ｓ１又は補助加圧空間部Ｓ２に連通した構成であればよい。 As another example of the second air passage 40b2, a through hole that communicates the annular recess 41 and the pressurizing space S1 may be provided in the front portion of the large diameter portion 40b.
Furthermore, as another example of the second ventilation path 40b2, a through hole communicating in the radial direction can be provided in the bottom 41b of the annular recess 41.
That is, the second air passage 40b2 may be configured to communicate with the pressurizing space S1 or the auxiliary pressurizing space S2.

また、ピストン部材４０の後端部側は、後述する進退機構７０によって押動されるように形成されるとともに、進退機構７０の回転子７２を回転自在に支持する軸部としても作用する。 Further, the rear end side of the piston member 40 is formed so as to be pushed by an advance / retreat mechanism 70 which will be described later, and also functions as a shaft portion that rotatably supports the rotor 72 of the advance / retreat mechanism 70.

上記構成によれば、リフィール２０内のフォロア２４後端面とピストン部材４０前端面との間に加圧空間部Ｓ１が確保され、更に、ピストン部材４０内に補助加圧空間部Ｓ２が確保される。そして、これら加圧空間部Ｓ１と補助加圧空間部Ｓ２は、軸方向へ連通した加圧空間となる。
ここで、ピストン部材４０内の補助加圧空間部Ｓ２の容積は、筆記液２３の吐出に伴う減圧を考慮すれば、加圧空間部Ｓ１の容積の約１／３以上とするのが好ましく、更には加圧空間部Ｓ１の容積の約１／２以上とするのが好ましい。 According to the above configuration, the pressurization space S1 is secured between the rear end surface of the follower 24 in the refill 20 and the front end surface of the piston member 40, and the auxiliary pressurization space S2 is secured in the piston member 40. . And these pressurization space part S1 and auxiliary | assistant pressurization space part S2 become the pressurization space connected to the axial direction.
Here, the volume of the auxiliary pressurizing space portion S2 in the piston member 40 is preferably about 1/3 or more of the volume of the pressurizing space portion S1 in consideration of the reduced pressure accompanying the discharge of the writing liquid 23. Furthermore, it is preferable to set it to about 1/2 or more of the volume of the pressurizing space S1.

また、第一付勢部材５０は、コイル状の圧縮スプリングであり、その一端側をリフィール装着部３０後端側内周面の段部に係止させるとともに、その他端側をピストン部材４０内周面の段部に係止させて、リフィール２０とピストン部材４０との間に配置されることで、リフィール２０に相対してピストン部材４０を後方へ付勢している。 The first urging member 50 is a coiled compression spring. One end of the first urging member 50 is engaged with a step on the inner peripheral surface of the rear end side of the refill mounting portion 30, and the other end is connected to the inner periphery of the piston member 40. The piston member 40 is urged rearward relative to the refill 20 by being engaged with the stepped portion of the surface and disposed between the refill 20 and the piston member 40.

また、第二付勢部材６０は、第一付勢部材５０よりも付勢力の大きいコイル状の圧縮スプリングであり、その一端側を軸筒１０の先口部１１ａ内周面の段部に係止させるとともに、その他端側をリフィール２０前端側外周面の段部に係止させることで、軸筒１０に相対してリフィール２０を後方へ付勢している。 The second urging member 60 is a coiled compression spring having a larger urging force than that of the first urging member 50, and one end of the second urging member 60 is engaged with the stepped portion on the inner peripheral surface of the tip end portion 11 a of the shaft tube 10. While stopping, the other end side is latched by the step part of the outer peripheral surface of the front end side of the refill 20, and the refill 20 is urged | biased toward the axial cylinder 10 back.

また、進退機構７０は、軸筒１０の後端に接続されるとともに内周面に中駒部７１ａを有する後端筒状部材７１と、該後端筒状部材７１内に配置された回転子７２と、該回転子７２後方側に係合して後端筒状部材７１の後方に露出しているノック部材７３とからなる。
そして、この進退機構７０は、第一付勢部材５０及び第二付勢部材６０の付勢力に抗して、ノック操作によりノック部材７３が前方へ押し動かされた際に、回転子７２を前進させて所定位置で回転させて係止し、この係止状態を再度ノック操作があった場合に解除するように構成してある。
前記回転子７２の前端側は、ピストン部材４０に対し、後方から当接するとともに周方向へ回転するように係合している。 The advancing / retreating mechanism 70 is connected to the rear end of the shaft cylinder 10 and has a rear end cylindrical member 71 having an inner frame portion 71 a on the inner peripheral surface, and a rotor disposed in the rear end cylindrical member 71. 72 and a knock member 73 that is engaged with the rear side of the rotor 72 and is exposed behind the rear end tubular member 71.
The advance / retreat mechanism 70 advances the rotor 72 when the knock member 73 is pushed forward by a knock operation against the urging force of the first urging member 50 and the second urging member 60. The locked state is configured to be released when a knocking operation is performed again.
The front end side of the rotor 72 is engaged with the piston member 40 so as to contact from behind and rotate in the circumferential direction.

したがって、上記構成の進退機構７０によれば、ピストン部材４０は筆記部を突出させるように前進した状態で係止され、この係止状態が、再度外部からのノック操作があった際に解除されることになる。
なお、この進退機構７０は、前記のようにしてピストン部材４０を係止したり解除したりする構成であれば、他の構成であってもよい。 Therefore, according to the advancing / retreating mechanism 70 configured as described above, the piston member 40 is locked in a state of being advanced so as to project the writing portion, and this locked state is released when the knocking operation is performed again from the outside. Will be.
The advance / retreat mechanism 70 may have another configuration as long as the piston member 40 is locked or released as described above.

次に、上記構成の加圧式筆記具１について、その特徴的な作用効果を詳細に述べる。
先ず、初期状態として、筆記部２２が没入状態にあり、ノック操作が行われていない場合には、図１に示すように、リフィール２０は、第二付勢部材６０により後方へ付勢されるとともに、リフィール装着部３０の凸部３１を軸筒１０内周面の規制段部１２ａに係止させることで、筆記部２２を没入した状態に維持される。
この状態においては、ピストン部材４０は、第一付勢部材５０によって後方へ付勢されることで、リフィール装着部３０から離間した後退位置に維持される。
そのため、リフィール２０内の筆記液２３（詳細にはフォロア２４の後端面）と、該ピストン部材４０内の底部４０ａとの間に、加圧空間部Ｓ１および補助加圧空間部Ｓ２が確保される。
なお、ピストン部材４０の後方への移動は、ピストン部材４０後方のノック部材７３が、その周囲の後端筒状部材７１に係止されることで規制されている。 Next, the characteristic effect of the pressure type writing instrument 1 having the above-described configuration will be described in detail.
First, as an initial state, when the writing unit 22 is in an immersive state and no knocking operation is performed, the refill 20 is urged backward by the second urging member 60 as shown in FIG. At the same time, the writing portion 22 is maintained in an immersed state by locking the convex portion 31 of the refill mounting portion 30 to the regulation step portion 12a on the inner peripheral surface of the shaft tube 10.
In this state, the piston member 40 is urged rearward by the first urging member 50, so that the piston member 40 is maintained at the retracted position separated from the refill mounting portion 30.
Therefore, the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 are secured between the writing liquid 23 in the refill 20 (specifically, the rear end surface of the follower 24) and the bottom portion 40a in the piston member 40. .
The rearward movement of the piston member 40 is restricted by the knock member 73 behind the piston member 40 being locked to the rear end tubular member 71 around the piston member 40.

ピストン部材４０が前記後退位置にある際には、図１中の拡大図に示すように、ピストン部材用環状気密部材４２と気密当接部４１ａとの間に隙間が確保された状態で、ピストン部材用環状気密部材４２が遊嵌されている。
そのため、この隙間と、ピストン部材用環状気密部材４２と環状凹部４１の底部４１ｂとの隙間、第一通気路４０ｂ１および第二通気路４０ｂ２等によって、ピストン部材４０後方と加圧空間部Ｓ１とを連通する通気路が構成される。そして、この通気路が、進退機構７０内の構成部品間の隙間によって外気と連通しているため、加圧空間部Ｓ１および補助加圧空間部Ｓ２は、略大気圧の状態となる。 When the piston member 40 is in the retracted position, as shown in the enlarged view of FIG. 1, the piston member 40 is in a state where a gap is secured between the piston member annular airtight member 42 and the airtight contact portion 41a. An annular airtight member 42 for members is loosely fitted.
Therefore, the piston member 40 rear side and the pressurizing space S1 are formed by the gap, the gap between the piston member annular airtight member 42 and the bottom 41b of the annular recess 41, the first ventilation path 40b1, the second ventilation path 40b2, and the like. A communicating air passage is formed. And since this ventilation path is connected with external air by the clearance gap between the components in the advancing / retreating mechanism 70, pressurization space part S1 and auxiliary | assistant pressurization space part S2 will be in the state of substantially atmospheric pressure.

次に、図２に示すように、進退機構７０によってピストン部材４０が第一付勢部材５０の付勢力に抗して前進すると、加圧空間部Ｓ１および補助加圧空間部Ｓ２の空気は、第二通気路４０ｂ２および第一通気路４０ｂ１を通って軸筒内後方へ流出する。したがって、ピストン部材用環状気密部材４２は、加圧空間部Ｓ１第二通気路４０ｂ２から第一通気路４０ｂ１へ流れる空気に押されて、ピストン部材４０に相対して後方へ移動し、気密当接部４１ａに当接する。このピストン部材用環状気密部材４２の後方への移動は、ピストン部材用環状気密部材４２の外径部が軸筒１０内周面に摺接することによっても補助される。
そのため、加圧空間部Ｓ１および補助加圧空間部Ｓ２が密閉状態となり、これら加圧空間部Ｓ１および補助加圧空間部Ｓ２の空気が圧縮される。
なお、第一付勢部材５０の付勢力は第二付勢部材６０の付勢力よりも小さく設定されるため、ピストン部材４０が後退位置からリフィール装着部３０に当接するまでの移動範囲において、リフィール２０は、筆記状態となるまで前進するようなことはないが、加圧空間部Ｓ１および補助加圧空間部Ｓ２の急激な圧力変動により若干微動する場合もある。 Next, as shown in FIG. 2, when the piston member 40 moves forward against the urging force of the first urging member 50 by the advance / retreat mechanism 70, the air in the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 is It flows out through the second air passage 40b2 and the first air passage 40b1 to the rear in the shaft cylinder. Therefore, the annular airtight member for piston member 42 is pushed by the air flowing from the pressurized space S1 second air passage 40b2 to the first air passage 40b1, moves rearward relative to the piston member 40, and makes airtight contact. It contacts the part 41a. The backward movement of the piston member annular airtight member 42 is also assisted by the outer diameter portion of the piston member annular airtight member 42 being in sliding contact with the inner peripheral surface of the shaft tube 10.
Therefore, the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 are sealed, and the air in the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 is compressed.
Since the urging force of the first urging member 50 is set to be smaller than the urging force of the second urging member 60, the refill is within the moving range from the retracted position until the piston member 40 contacts the refill mounting portion 30. No. 20 does not move forward until the writing state is reached, but may slightly move due to sudden pressure fluctuations in the pressurizing space S1 and the auxiliary pressurizing space S2.

更にピストン部材４０の前進が継続した場合には、ピストン部材４０の前進に伴ってリフィール２０も前進し、該リフィール２０は、筆記部２２が最大突出位置（図３に示す状態）となるまで前進する。この前進の最中も、気密当接部４１ａとピストン部材用環状気密部材４２の当接状態が維持されているため、加圧空間部Ｓ１および補助加圧空間部Ｓ２の加圧状態も維持される。 Further, when the piston member 40 continues to advance, the refill 20 advances as the piston member 40 advances, and the refill 20 advances until the writing portion 22 reaches the maximum protruding position (the state shown in FIG. 3). To do. Even during this forward movement, the contact state between the airtight contact portion 41a and the piston member annular airtight member 42 is maintained, so that the pressurized state of the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 is also maintained. The

次に、ノック部材７３に対する押圧力が解除された際に、進退機構７０内の回転子７２が若干後退して係止するため、その動きに連動してリフィール２０およびピストン部材４０も若干後退した位置で静止し、図４に示すように、筆記部２２を突出させた使用可能状態が維持される。 Next, when the pressing force to the knock member 73 is released, the rotor 72 in the advance / retreat mechanism 70 is slightly retracted and locked, so that the refill 20 and the piston member 40 are also slightly retracted in conjunction with the movement. As shown in FIG. 4, the usable state where the writing unit 22 protrudes is maintained.

前記のようにピストン部材４０が若干後退する際、気密当接部４１ａとピストン部材用環状気密部材４２との当接状態は、加圧空間部Ｓ１および補助加圧空間部Ｓ２の圧縮空気の圧力により維持される。
より詳細に説明すれば、ピストン部材４０の前端面（詳細には大径部４０ｂの前端面）と、リフィール装着部３０の後端面とが当接した状態において、これら両端面の間には、通気溝４０ｂ３による空気通路が形成される。そのため、この通気溝４０ｂ３によって、加圧空間部Ｓ１及び補助加圧空間部Ｓ２と環状凹部４１内とが連通する。
前記当接状態において、図３から図４に示すように、ピストン部材４０が若干後退したとしても、ピストン部材用環状気密部材４２は、加圧空間部Ｓ１および補助加圧空間部Ｓ２から環状凹部４１内へわたる空気の圧力に押されて、気密当接部４１ａに押し付けられているため、気密当接部４１ａとの間に隙間を生じることがない。よって、加圧空間部Ｓ１および補助加圧空間部Ｓ２の圧縮状態が維持されることになる。
なお、図示例では、ピストン部材４０の前端部に通気溝４０ｂ３を設けた好ましい一例を示したが、他例としては、通気溝４０ｂ３を省いたとしても、ピストン部材４０の前端部には弾性体等の気密材がないため、ピストン部材４０前端面とリフィール装着部３０後端面との間に、加圧空間部Ｓ１及び補助加圧空間部Ｓ２と環状凹部４１とを連通する隙間を確保することが可能である。 When the piston member 40 is slightly retracted as described above, the contact state between the airtight contact portion 41a and the piston member annular airtight member 42 is the pressure of the compressed air in the pressurizing space portion S1 and the auxiliary pressurizing space portion S2. Maintained by
More specifically, in the state where the front end surface of the piston member 40 (specifically, the front end surface of the large diameter portion 40b) and the rear end surface of the refill mounting portion 30 are in contact with each other, An air passage is formed by the ventilation groove 40b3. Therefore, the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 communicate with the inside of the annular recess 41 by the ventilation groove 40b3.
In the contact state, as shown in FIGS. 3 to 4, even if the piston member 40 is slightly retracted, the piston member annular airtight member 42 has an annular recess from the pressurizing space S <b> 1 and the auxiliary pressurizing space S <b> 2. 41 is pressed against the airtight contact portion 41a by being pressed by the pressure of the air flowing into the airtight portion 41, so that no gap is generated between the airtight contact portion 41a. Therefore, the compressed state of the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 is maintained.
In the illustrated example, a preferable example in which the ventilation groove 40b3 is provided at the front end of the piston member 40 is shown. However, as another example, even if the ventilation groove 40b3 is omitted, an elastic body is provided at the front end of the piston member 40. Since there is no airtight material such as, a clearance for communicating the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 with the annular recess 41 is ensured between the front end surface of the piston member 40 and the rear end surface of the refill mounting portion 30. Is possible.

そして、図４に示す使用可能状態においては、加圧空間部Ｓ１および補助加圧空間部Ｓ２の圧縮空気の圧力によって、リフィール２０内の筆記液２３及びフォロア２４が前方へ押されるため、筆記部２２からの筆記液２３の吐出状態を良好に維持することができる。
また、本実施の形態の加圧式筆記具１によれば、加圧空間部Ｓ１及び補助加圧空間部Ｓ２によって比較的大きい圧縮空間を確保しているため、筆記液２３の吐出により加圧空間部Ｓ１及び補助加圧空間部Ｓ２の空気圧が減圧したとしても、その減圧量を比較的低くすることができ、ひいては、筆記液２３の良好な吐出状態を長時間にわたって維持することができる。 In the usable state shown in FIG. 4, the writing liquid 23 and the follower 24 in the refill 20 are pushed forward by the pressure of the compressed air in the pressurizing space portion S1 and the auxiliary pressurizing space portion S2. The discharge state of the writing liquid 23 from 22 can be maintained satisfactorily.
Further, according to the pressure-type writing instrument 1 of the present embodiment, a relatively large compression space is secured by the pressure space portion S1 and the auxiliary pressure space portion S2. Even if the air pressure in S1 and the auxiliary pressurizing space S2 is reduced, the amount of reduced pressure can be made relatively low, and as a result, a good discharge state of the writing liquid 23 can be maintained for a long time.

また、図５に示すように、進退機構７０が解除操作されることで、ピストン部材４０が後退すると、加圧空間部Ｓ１および補助加圧空間部Ｓ２の空気が急激に減圧するため、ピストン部材用環状気密部材４２は、環状凹部４１内を相対的に前方へ移動することになる。この際のピストン部材用環状気密部材４２の移動は、該ピストン部材用環状気密部材４２の外径部が、軸筒１０の内周面に摺接することによっても補助される。
したがって、ピストン部材用環状気密部材４２と気密当接部４１ａとの間に隙間が生じ、この隙間や、ピストン部材用環状気密部材４２と環状凹部４１の底部４１ｂとの隙間、第一通気路４０ｂ１及び第二通気路４０ｂ２等によって連続する通気路が形成され、この通気路によって、外気が加圧空間部Ｓ１および補助加圧空間部Ｓ２へ流入する。 Further, as shown in FIG. 5, when the piston member 40 is retracted by the release operation of the advance / retreat mechanism 70, the air in the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 is rapidly depressurized. The annular airtight member 42 moves relatively forward in the annular recess 41. The movement of the piston member annular airtight member 42 at this time is also assisted by the outer diameter portion of the piston member annular airtight member 42 being in sliding contact with the inner peripheral surface of the shaft tube 10.
Therefore, a gap is generated between the piston member annular airtight member 42 and the airtight contact portion 41a, and this gap, the gap between the piston member annular airtight member 42 and the bottom 41b of the annular recess 41, the first air passage 40b1. The second air passage 40b2 and the like form a continuous air passage, and the outside air flows into the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 through this air passage.

そして、ピストン部材４０が更に後退することで、筆記部２２が没入し、初期状態（図１に示す状態）に復帰する。
この復帰状態では、前述したように加圧空間部Ｓ１および補助加圧空間部Ｓ２が外気と連通して略大気圧に維持されるため、リフィール２０内の筆記液２３が、加圧空間部Ｓ１および補助加圧空間部Ｓ２内の空気圧によって意図せずに筆記部２２から流出してしまうようなことはない。 Then, when the piston member 40 is further retracted, the writing unit 22 is immersed and returns to the initial state (the state shown in FIG. 1).
In this return state, as described above, the pressurizing space portion S1 and the auxiliary pressurizing space portion S2 communicate with the outside air and are maintained at a substantially atmospheric pressure, so that the writing liquid 23 in the refill 20 is added to the pressurizing space portion S1. In addition, the air pressure in the auxiliary pressurizing space S2 does not unintentionally flow out of the writing unit 22.

なお、上記実施の形態の加圧式筆記具１によれば、予めリフィール２０を具備した態様を示しているが、他例としては、リフィール２０を予め具備していない態様としてもよい。すなわち、別途用意されるリフィール２０が、後で装着されるようにしてもよい。 In addition, according to the pressure-type writing instrument 1 of the said embodiment, although the aspect which comprised the refill 20 previously is shown, it is good also as an aspect which does not comprise the refill 20 as another example. That is, the refill 20 prepared separately may be attached later.

また、上記実施の形態の加圧式筆記具１は、修正ペンとしたが、筆記液２３をボールペン用インクとすることで、ボールペンを構成することも可能である。この構成によれば、加圧操作によりインクの吐出を良好にすることができるボールペンを提供することができ、例えば、上向き筆記の際にも、筆記掠れの生じ難いボールペンとすることができる。 Moreover, although the pressure-type writing instrument 1 of the said embodiment was used as the correction pen, it is also possible to comprise a ball-point pen by using the writing liquid 23 as the ink for ball-point pens. According to this configuration, it is possible to provide a ballpoint pen that can improve ink discharge by a pressurizing operation. For example, it is possible to provide a ballpoint pen that does not easily wrinkle during upward writing.

次に、上記加圧式筆記具１において、補助加圧空間部Ｓ２の有無による加圧性能の違いを、図６に示す実験結果に基づいて説明する。
図６は、上記構成の加圧式筆記具１と、加圧式筆記具１から補助加圧空間部Ｓ２を省いた構成（図示せず）との各々について、筆記によるインク量の変化と加圧時の圧力との関係を示している。なお、補助加圧空間部Ｓ２を省いた構成とは、上記加圧式筆記具１において、ピストン部材４０内の空間を例えば合成樹脂等の固体により埋めた構成としたものである。
補助加圧空間部Ｓ２を有する加圧式筆記具１では、図６中に実線で示すように、インク量が初期規定量からゼロまで減少した際、加圧時の圧力は、約１．９atmから約１．３atmまで減少する。したがって、その際の圧力差は、約０．６atmとなる。
また、補助加圧空間部Ｓ２の無い加圧式筆記具では、図６中に一点鎖線で示すように、インク量が初期規定量からゼロまで減少した際、加圧時の圧力は、約３．０atmから約１．４atmまで減少する。したがって、その際の圧力差は、約１．６atmとなる。
すなわち、補助加圧空間部Ｓ２を有する加圧式筆記具１では、筆記によるインク量の減少に伴う加圧時圧力の減圧が、補助加圧空間部Ｓ２の無い加圧式筆記具と比較して著しく小さいということがいえる。
よって、加圧式筆記具１によれば、リフィール２０のインク減少量に拘わらずに安定したインク吐出量を維持することができ、ひいては、インク残量が少なくなった場合でも良好な筆感を得ることができる。 Next, in the pressure-type writing instrument 1, the difference in pressure performance depending on the presence or absence of the auxiliary pressure space S2 will be described based on the experimental results shown in FIG.
FIG. 6 shows the change in the ink amount due to writing and the pressure during pressurization for each of the pressure-type writing instrument 1 having the above-described configuration and the configuration (not shown) in which the auxiliary pressure space S2 is omitted from the pressure-type writing instrument 1. Shows the relationship. The configuration in which the auxiliary pressurizing space portion S2 is omitted is a configuration in which the space in the piston member 40 is filled with a solid such as a synthetic resin in the pressurizing writing instrument 1 described above.
In the pressurizing writing instrument 1 having the auxiliary pressurizing space portion S2, as shown by the solid line in FIG. 6, when the ink amount is reduced from the initial specified amount to zero, the pressure during pressurization is about 1.9 atm to about Decrease to 1.3 atm. Therefore, the pressure difference at that time is about 0.6 atm.
Further, in the pressure-type writing instrument without the auxiliary pressure space S2, when the ink amount is reduced from the initial specified amount to zero as shown by a one-dot chain line in FIG. 6, the pressure at the time of pressurization is about 3.0 atm. To about 1.4 atm. Therefore, the pressure difference at that time is about 1.6 atm.
That is, in the pressurizing writing instrument 1 having the auxiliary pressurizing space portion S2, the pressure reduction during pressurization accompanying the decrease in the ink amount due to writing is significantly smaller than that of the pressurizing writing instrument having no auxiliary pressurizing space portion S2. I can say that.
Therefore, according to the pressure-type writing instrument 1, a stable ink discharge amount can be maintained regardless of the ink decrease amount of the refill 20, and as a result, a good writing feeling can be obtained even when the remaining amount of ink is reduced. Can do.

本発明に係わる加圧式筆記具の一例を示す断面図であり、加圧空間部が加圧されていない状態を示している。It is sectional drawing which shows an example of the pressurization type writing instrument concerning this invention, and has shown the state by which the pressurization space part is not pressurized. 同加圧式筆記具の一例を示す断面図であり、ノック操作により加圧空間部が加圧された状態を示している。It is sectional drawing which shows an example of the pressurization type writing instrument, and has shown the state by which the pressurization space part was pressurized by knock operation. 同加圧式筆記具の一例を示す断面図であり、更なるノック操作により筆記部が限界位置まで突出した状態を示している。It is sectional drawing which shows an example of the pressurization type writing instrument, and has shown the state which the writing part protruded to the limit position by the further knock operation. 同加圧式筆記具の一例を示す断面図であり、筆記部の突出状態でピストン部材が進退機構により係止された状態を示す。It is sectional drawing which shows an example of the same pressurization type writing instrument, and shows the state by which the piston member was latched by the advancing / retreating mechanism in the protrusion state of the writing part. 同加圧式筆記具の一例を示す断面図であり、進退機構による係止状態が解除された後の状態であって、進退機構が後退している途中の状態を示す。It is sectional drawing which shows an example of the same pressurization type writing instrument, and is the state after the latching state by an advance / retreat mechanism is cancelled | released, Comprising: The state in the middle of the advance / retreat mechanism retreating is shown. 加圧空間部の有無による加圧性能の違いを示すグラフである。It is a graph which shows the difference in the pressurization performance by the presence or absence of a pressurization space part.

Explanation of symbols

１：加圧式筆記具
１０：軸筒
２０：リフィール
２２：筆記部
２３：筆記液
３０：リフィール気密手段
４０：ピストン部材
４０ｂ１：第一通気路
４０ｂ２：第二通気路
４１：環状凹部
４１ａ：気密当接部
４２：ピストン部材用環状気密部材
５０：第一付勢部材
６０：第二付勢部材
７０：進退機構
Ｓ１：加圧空間部 1: Pressure type writing instrument 10: Shaft cylinder 20: Refill 22: Writing part 23: Writing liquid 30: Refill airtight means 40: Piston member 40b1: First air passage 40b2: Second air passage 41: Annular recess 41a: Airtight contact Part 42: annular airtight member for piston member 50: first urging member 60: second urging member 70: advance / retreat mechanism S1: pressure space part

Claims

A refill mounting portion capable of mounting a substantially tubular refill filled with writing liquid between the writing portion on the front end side and the opening on the rear end side, and the refill when mounted can be approached and separated from the rear. The piston member is provided in the shaft cylinder, and is provided with an advance / retreat mechanism that advances and retracts the piston member in the axial direction by an external operation, and between the writing liquid in the refill when attached and the piston member, A pressure-type writing instrument designed to form a pressure space compressed by the advance of the piston member,
The refill mounting portion is provided with refill airtight means for hermetically sealing between the inner peripheral surface of the shaft tube and the outer peripheral surface of the refill when mounted.
An annular airtight member is provided on the outer peripheral side of the piston member so as to be movable by a predetermined amount in the axial direction relative to the piston member, and to bring the outer peripheral portion into airtight contact with the inner peripheral surface of the shaft cylinder,
An airtight contact portion is provided on the rear side of the annular airtight member in the piston member, which can contact the annular airtight member over the entire circumference,
When the annular airtight member and the airtight contact portion are separated from each other, the airtight contact portion communicates with the outside of the shaft cylinder on the centrifugal direction side, and the airtight contact portion on the centripetal direction side. A pressure-type writing instrument comprising an air passage communicating with the pressure space.

The said piston member is formed in the substantially bottomed cylindrical shape which turned the bottom part back, The inside space is made into the auxiliary pressurization space part connected to the said pressurization space part, It is characterized by the above-mentioned. The pressure-type writing instrument according to 1.

By providing the refill mounting portion movably in the axial direction, a pressure-type writing instrument that causes the writing portion of the refill when mounted on the refill mounting portion to appear and disappear from the front end of the shaft cylinder,
A first urging member that urges the piston member rearward relative to the refill, and a urging force that urges the refill rearward relative to the shaft tube and has a larger urging force than the first urging member. Two biasing members,
The piston member is provided so as to advance and retreat between a position separated from the refill in the writing part immersion state and a position where the writing part is pushed from the front end by pushing the refill.
The advance / retreat mechanism is configured to lock the piston member that has advanced so as to project the writing portion, and to release the locked state when a knocking operation is performed from the outside again. The pressure-type writing instrument according to claim 1 or 2.