JP6495113B2

JP6495113B2 - Writing instrument

Info

Publication number: JP6495113B2
Application number: JP2015125159A
Authority: JP
Inventors: 裕右真田
Original assignee: Pilot Corp KK
Current assignee: Pilot Corp KK
Priority date: 2015-06-22
Filing date: 2015-06-22
Publication date: 2019-04-03
Anticipated expiration: 2035-06-22
Also published as: JP2017007209A

Description

本発明は筆記具に関する。より詳細には、軸筒内に芯繰出機構を配設し、芯繰出機構を作動させることで軸筒内の芯を該軸筒の前方に設けた先口の先端部より繰り出す構造の筆記具に関する。 The present invention relates to a writing instrument. More specifically, the present invention relates to a writing instrument having a structure in which a lead feeding mechanism is disposed in a shaft cylinder, and a lead in the shaft cylinder is fed out from a tip portion of a tip provided in front of the shaft cylinder by operating the lead feeding mechanism. .

従来より、鉛筆、色鉛筆及びクレヨンなどの筆記用の芯を繰り出す芯繰出機構を備えた筆記具が知られている。この芯繰出機構を備えた筆記具を用いて筆記する場合、芯繰出機構を操作することで筆記具の端部から芯を突出させる必要があるが、筆記具から突出させた芯は、芯の突出量が長くなると、突出した部分が折れてしまう場合があり、芯折れを防止する構造が重要視されている。
この芯折れ防止構造は、筆記具のなかでも細くて柔軟性が低く折れ易い芯を繰り出すシャープペンシルにおいて、特に求められる構造である。 2. Description of the Related Art Conventionally, writing instruments having a lead feeding mechanism for feeding out a writing lead such as a pencil, a colored pencil, and a crayon are known. When writing using a writing instrument provided with this lead feeding mechanism, it is necessary to project the lead from the end of the writing tool by operating the lead feeding mechanism, but the lead projected from the writing tool has a protruding amount of lead. When it becomes long, the protruding portion may be broken, and a structure that prevents the core from being broken is regarded as important.
This structure for preventing breakage of the core is a structure particularly required for a mechanical pencil that feeds out a thin, flexible and easily broken core among writing instruments.

芯折れを防止するシャープペンシルの構造としては、筆記時に一定以上の筆圧が芯に掛かると筆圧緩衝手段により芯折れを防止する技術が知られている。例えば、特許文献１には、芯に過大な筆圧が掛かると緩衝用のスプリングが収縮して芯を後退させ、芯折れを防止するシャープペンシルが記載されている。
この特許文献１に記載されているシャープペンシルでは、芯を狭持するチャックの後方に固定した芯パイプに緩衝スプリングを嵌着しており、芯とチャックに対して軸心方向に過大な筆圧が掛かると緩衝スプリングが収縮してチャックと芯を後退させる構造となっている。そこで、シャープペンシルを筆記面に対して垂直に立てて筆記した場合、筆圧はそのまま芯を介して緩衝スプリングに伝えられるが、シャープペンシルを筆記面に対して傾けて筆記した場合、芯に掛かる筆圧は、芯の軸心方向に掛かる力が減少し、軸径方向に働く力が大きくなる。このため、シャープペンシルを筆記面に対して傾けて筆記すると、緩衝スプリングが収縮することなく、芯が筆圧に耐えることができずに折れてしまう虞があり、芯が折れないようにするにはシャープペンシルの筆記角度に気を配りながら筆記する必要があった。 As a mechanical pencil structure for preventing breakage of the core, a technique for preventing breakage of the core by writing pressure buffering means when a certain level of writing pressure is applied to the core during writing is known. For example, Patent Document 1 describes a mechanical pencil that prevents a breakage of the core by retracting the core when the excessive writing pressure is applied to the core and retracting the core.
In the mechanical pencil described in Patent Document 1, a buffer spring is fitted to a core pipe fixed behind the chuck holding the core, and an excessive pen pressure in the axial direction relative to the core and the chuck. When applied, the buffer spring contracts to retract the chuck and core. Therefore, when writing with the mechanical pencil standing perpendicular to the writing surface, the writing pressure is transmitted as it is to the buffer spring through the lead, but when writing with the mechanical pencil tilted with respect to the writing surface, it is applied to the lead. In the writing pressure, the force applied in the axial direction of the core decreases, and the force acting in the axial direction increases. For this reason, when writing with the mechanical pencil tilted with respect to the writing surface, the buffer spring will not contract, and the lead may not be able to withstand the writing pressure and may break, so that the lead will not break. Needed to write while paying attention to the writing angle of the mechanical pencil.

前記特許文献１以外の構成として、特許文献２では、筆記時において芯に過大な筆圧が掛かった際、口金及び芯繰出機構を含めた筆記部が軸本体内の支点に対して傾動することで芯折れを防止するシャープペンシルが記載されている。
この特許文献２に記載されているシャープペンシルでは、筆記面に対して傾けて筆記した場合でも筆記部が傾動することで芯折れを防止できるが、筆記部が傾動した状態から更に筆圧を上げると芯に負荷が掛かって芯が折れる虞があり、筆圧に気を配りながら筆記する必要があった。 As a configuration other than Patent Document 1, in Patent Document 2, when excessive writing pressure is applied to the core at the time of writing, the writing unit including the base and the core feeding mechanism tilts with respect to the fulcrum in the shaft body. Describes a mechanical pencil that prevents core breakage.
In the mechanical pencil described in Patent Document 2, even if the writing is tilted with respect to the writing surface, the writing part can be tilted to prevent core breakage, but the writing pressure is further increased from the state where the writing part is tilted. There was a risk that the lead might be broken due to the load on the lead, and it was necessary to write while paying attention to the writing pressure.

実開昭５６−１３０８７４号公報Japanese Utility Model Publication No. 56-130874 特開２０１０−２６４６３８号公報JP 2010-264638 A

本発明は、前記問題を鑑みて、筆記時に筆記角度や筆圧に気を配らなくても芯折れを防止できる筆記具を提供することを課題とする。 In view of the above problems, an object of the present invention is to provide a writing instrument that can prevent core breakage without paying attention to a writing angle or a writing pressure at the time of writing.

本発明は、
「１．軸筒内に芯繰出機構を配設し、前記芯繰出機構を作動させることで前記軸筒内の芯を該軸筒の前方に設けた先口の先端部より繰り出す構造の筆記具において、前記先口の後方に、前端部が該先口の後方部と連設し且つ後端部が前記軸筒の内方に設けた連結部または前記芯繰出機構の前方部と連設する弾性変形部を設け、前記弾性変形部に外方へ膨出する膨出部を形成し、芯に筆圧が掛かった際、前記弾性変形部の膨出部が前記軸筒の内面に圧接されて弾性変形することで該弾性変形部の前端部と後端部との距離が軸心に沿った方向へ広がると共に、前記弾性変形部に連設した前記先口が前記芯繰出機構に対して前方へ移動し、前記芯の前端部が前記先口の先端部で保護されることを特徴とした筆記具。
２．前記軸筒の内面に内方へ突出した係止部を形成し、前記軸筒の係止部と前記連結部の外面に設けた被係止部とを係止し、前記軸筒の係止部を支点にして前記連結部材を軸心と直交方向に傾動可能に構成したことを特徴とする前記１項に記載の筆記具。
３．前記芯繰出機構の前方に、側面が前記先口の内面と摺接するガイド部を連設したことを特徴とする前記１項または２項に記載の筆記具。
４．前記弾性変形部の膨出部の少なくとも一部が前記軸筒の内面と常に当接するよう構成したことを特徴とする前記１項ないし３項のいずれか１項に記載の筆記具。
５．前記弾性変形部の膨出部が複数の可撓片からなることを特徴とする前記１項ないし４項のいずれか１項に記載の筆記具。
６．前記連結部材の前方部と前記芯繰出機構に設けた段部との間に弾発部材を配し、前記弾発部材により前記芯繰出機構を前方へ弾発したことを特徴とする前記１項ないし５項のいずれか１項に記載の筆記具。」である。 The present invention
"1. A writing instrument having a structure in which a lead feeding mechanism is disposed in a shaft cylinder, and the lead in the shaft cylinder is fed out from a tip portion of a tip provided in front of the shaft cylinder by operating the lead feeding mechanism. Elasticity in which the front end portion is connected to the rear portion of the front opening and the rear end portion is connected to the connecting portion provided inward of the shaft cylinder or the front portion of the core feeding mechanism behind the front opening. A deforming portion is provided, and a bulging portion that bulges outward is formed on the elastic deforming portion, and when the pen pressure is applied to the core, the bulging portion of the elastic deforming portion is pressed against the inner surface of the shaft tube. By elastically deforming, the distance between the front end portion and the rear end portion of the elastically deforming portion widens in the direction along the axial center, and the front opening connected to the elastically deforming portion is forward of the core feeding mechanism. The writing instrument, wherein the leading end of the lead is protected by the tip of the tip.
2. A locking portion projecting inwardly is formed on the inner surface of the shaft tube, and the locking portion of the shaft tube and a locked portion provided on the outer surface of the connecting portion are locked. 2. The writing instrument according to claim 1, wherein the connecting member is configured to be tiltable in a direction orthogonal to the axial center with the portion as a fulcrum.
3. 3. The writing instrument according to claim 1 or 2, wherein a guide portion whose side surface is in sliding contact with the inner surface of the tip is provided in front of the lead feeding mechanism.
4). The writing instrument according to any one of claims 1 to 3, wherein at least a part of the bulging portion of the elastically deforming portion is always in contact with the inner surface of the shaft cylinder.
5. 5. The writing instrument according to any one of claims 1 to 4, wherein the bulging portion of the elastically deforming portion comprises a plurality of flexible pieces.
6). Item 1. The elastic member is disposed between a front portion of the connecting member and a step portion provided in the lead feeding mechanism, and the lead feeding mechanism is bulleted forward by the resilient member. The writing instrument according to any one of items 5 to 5. Is.

本発明の筆記具は、鉛筆、色鉛筆、クレヨンなどの筆記用の芯を繰り出すことができる筆記具に用いることができ、好適には細くて柔軟性が低く折れやすい芯を繰り出すシャープペンシルに用いることできる。
前記シャープペンシルにおける芯繰出機構としては、公知のシャープペンシルの芯繰出構造を用いることができ、その操作方法は芯繰出機構の後部をノックすることで芯が繰り出される後端ノック式でもよく、芯繰出機構を側部からのノックすることで芯を繰り出すサイドノック式でもよい。
また、前記弾性変形部は先口の後方部に該先口と一体で形成してもよく、前記連結部の前方部または芯繰出機構の前方部に該連結部または該芯繰出機構と一体に形成してもよく、先口と連結部または芯繰出機構と弾性変形部とを各々別体で形成してそれぞれを連結させて構成してもよい。 The writing instrument of the present invention can be used for a writing instrument that can feed out a writing core such as a pencil, a colored pencil, or a crayon, and can be used in a mechanical pencil that preferably pulls out a thin, flexible, and easy-to-break core.
As the lead feeding mechanism in the mechanical pencil, a well-known mechanical pencil lead feeding structure can be used, and its operation method may be a rear end knock type in which the lead is drawn by knocking the rear part of the lead feeding mechanism. A side knock type in which the lead is fed out by knocking the feeding mechanism from the side may be used.
The elastic deformation portion may be formed integrally with the tip opening at the rear portion of the tip opening, and integrated with the connection portion or the lead feeding mechanism at the front portion of the connecting portion or the front portion of the lead feeding mechanism. It may be formed, and the front end and the connecting portion or the core feeding mechanism and the elastic deformation portion may be formed separately and connected to each other.

弾性変形部の前端部と後端部との間に形成する膨出部の形状は、薄く形成することで撓んで弾性が得られる金属や硬質樹脂で膨出部を形成する場合と、それ自体が弾力性を有したゴムや発泡樹脂で膨出部を形成する場合とで異なる。
金属や硬質樹脂で膨出部を形成する場合には、その断面形状を軸筒内面への当接箇所を基点に前方と後方とが互いに漸次拡開する形状、例えば外方が先窄むように形成した三角形状、台形形状、円弧形状などを採用できる。いうまでもなく、膨出部が変形できるように、三角形状、台形形状に成形する場合には底辺部は設けず、円形形状に成形する場合には弦を設けず、膨出部の前方と後方とが自由に軸心に沿った方向に広がるようにする必要がある。
ゴムや発泡樹脂で膨出部を形成する場合には、その断面形状を外方が先窄み且つ中身がゴムや発泡樹脂で充填された三角形状、台形形状、円弧形状に形成し、軸筒内面への当接箇所を基点に膨出部全体が圧接され、内方へ潰れることで膨出部の前方と後方とが軸心に沿った方向に伸びるようにする必要がある。 The shape of the bulging portion formed between the front end portion and the rear end portion of the elastically deforming portion is the case where the bulging portion is formed of a metal or hard resin that can be bent and elasticized by being thinly formed. Is different from the case where the bulging portion is formed of elastic rubber or foamed resin.
When the bulging part is formed of metal or hard resin, the cross-sectional shape is formed so that the front and the rear gradually expand from the point of contact with the inner surface of the shaft cylinder, for example, the outer part is tapered. A triangular shape, trapezoidal shape, arc shape, or the like can be employed. Needless to say, so that the bulging part can be deformed, the bottom part is not provided when forming into a triangular shape or a trapezoidal shape, and the string is not provided when forming into a circular shape, It is necessary to allow the rear side to freely spread in the direction along the axis.
When forming the bulging part with rubber or foamed resin, the cross-sectional shape is formed in a triangular shape, trapezoidal shape, or arc shape whose outer side is tapered and the contents are filled with rubber or foamed resin. It is necessary that the entire bulged portion is pressed against the inner surface as a base point and crushed inward so that the front and rear of the bulged portion extend in the direction along the axis.

本発明における連結部は、軸筒と芯繰出機構との間に設け、軸筒の軸心に芯繰出機構を配置させるものであり、連結部に形成した孔部に芯繰出機構の一部を挿通させることで該芯繰出機構の中心と軸筒の中心とを揃えるものである。
尚、連結部は、軸筒と一体あるいは別体で形成することができるが、芯繰出機構を軸筒の軸心に配置させるため、少なくとも連結部の一部を軸筒に対して動かないようにすることが肝要である。 The connecting portion in the present invention is provided between the shaft cylinder and the core feeding mechanism, and the core feeding mechanism is arranged at the shaft center of the shaft cylinder. A part of the core feeding mechanism is provided in the hole formed in the connecting portion. By inserting, the center of the core feeding mechanism and the center of the shaft cylinder are aligned.
The connecting portion can be formed integrally with or separately from the shaft tube, but at least a part of the connecting portion does not move relative to the shaft tube in order to arrange the core feeding mechanism at the shaft center of the shaft tube. It is important to make it.

軸筒に設けた係止部と連結部に設けた被係止部との係止手段は、係止部と被係止部とを圧入して嵌着してもよく、係止部と被係止部とに螺子を形成して螺着してもよく、軸筒の係止部に連結部材の被係止部を当接させて連結部材を軸筒に対して前方への移動ができないように係止してもよい。
また、連結部を傾動させる方法としては、連結部を合成樹脂などの軟質材で形成し、連結部が撓むことで傾動させる構成や、連結部を金属などの硬質材で形成し、軸筒の係止部を支点にして該連結部全体が傾くことができるように係止する構成でもよい。
更に、支点となる軸筒の係止部を軸筒の軸心方向における中央部の後方に形成することで、支点から連結部先端までの長さを長くすることができる。そうすることで、支点に対して連結部を撓ませた場合及び連結部全体を傾けた場合のどちらでも傾動させることが容易となるため好ましい。 The locking means between the locking portion provided in the shaft cylinder and the locked portion provided in the connecting portion may be press-fitted between the locking portion and the locked portion, and may be fitted. A screw may be formed on the locking portion and screwed, and the locked portion of the connecting member is brought into contact with the locking portion of the shaft tube so that the connecting member cannot be moved forward with respect to the shaft tube. You may lock as follows.
In addition, as a method of tilting the connecting portion, the connecting portion is formed of a soft material such as synthetic resin, and the connecting portion is tilted by bending, or the connecting portion is formed of a hard material such as a metal, It is also possible to employ a configuration in which the entire connecting portion can be tilted with the locking portion as a fulcrum.
Furthermore, the length from the fulcrum to the distal end of the connecting portion can be increased by forming the locking portion of the shaft tube serving as a fulcrum behind the central portion in the axial direction of the shaft tube. By doing so, since it becomes easy to incline either when the connection part is bent with respect to the fulcrum or when the whole connection part is inclined, it is preferable.

また、芯繰出機構の前方に、側面が前記先口の内面と摺接するガイド部を連設することで、筆記時に弾性変形部が弾性変形して先口を前方に移動させる際、先口がガイド部の側面に沿って移動することで該先口がぐらつくことがなく、先口の軸心とガイド部の軸心が一致した状態を維持できるため、芯に負荷を掛けずに先口を摺動させることができる。
尚、ガイド部は芯繰出機構と一体的に形成してもよく、別体で形成してもよいが、先口と芯繰出機構との間で芯折れが発生した場合に折れた芯を取り除けるように、芯繰出機構とガイド部とを別体で形成し、且つ螺合等によりガイド部材と芯繰出機構または該芯繰出機構を内包した連結部とを着脱可能に構成することが好ましい。 In addition, by connecting a guide portion whose side surface is in sliding contact with the inner surface of the tip opening in front of the lead feeding mechanism, when the elastic deformation portion is elastically deformed during writing and the tip opening moves forward, By moving along the side surface of the guide portion, the tip opening does not wobble, and it is possible to maintain the state where the axis of the tip opening coincides with the axis of the guide portion. Can be slid.
The guide portion may be formed integrally with the lead feeding mechanism or may be formed separately. However, when the lead breaks between the tip and the lead feeding mechanism, the broken lead can be removed. As described above, it is preferable that the lead feeding mechanism and the guide portion are formed separately and the guide member and the lead feeding mechanism or the connecting portion including the lead feeding mechanism are detachably configured by screwing or the like.

また、弾性変形部の膨出部の少なくとも一部が前記軸筒の内面と常に当接するよう構成することで、芯に筆圧が掛かった際、弾性変形部の膨出部が弾性変形する一定の筆圧までは先口と共に芯を支えることができ、過大な負荷が芯に掛かった際、膨出部が即座に弾性変形を始め、先口を前方に押し出すため、芯折れする前に先口の先端部で芯を保護することができる。 In addition, since at least a part of the bulging portion of the elastic deformation portion is always in contact with the inner surface of the shaft tube, the bulging portion of the elastic deformation portion is elastically deformed when writing pressure is applied to the core. Up to the pen pressure, the lead can be supported together with the tip, and when an excessive load is applied to the lead, the bulging part immediately starts elastic deformation and pushes the tip forward, so the tip is broken before the tip breaks. The lead can be protected at the tip of the mouth.

更に、弾性変形部の膨出部を可撓性を有し同形状に形成した複数の可撓片により構成し、可撓片を外方に向かって膨出する鉤状または円弧状に形成することで、芯に筆圧が掛かった際、可撓片が軸筒の内面に圧接されて軸心方向に伸びるように弾性変形し、弾性変形部の前端部と後端部との距離を広げることができる。
また、複数の可撓片を膨出部の外周に均等に配設した場合には、芯に筆圧が掛かった際、筆記具の円周方向のどの位置を把持して筆記しても複数の可撓片の一つが軸筒内面に圧接されて弾性変形をはじめ、続けて隣設した他の可撓片が次々と弾性変形をはじめ、可撓片全体が軸心に沿って伸びることで先口を前方へ移動させることができ、筆記具を把持する位置に関係なく芯折れを防止することができる。 Further, the bulging portion of the elastic deformation portion is constituted by a plurality of flexible pieces having flexibility and the same shape, and the flexible piece is formed in a bowl shape or an arc shape that bulges outward. Thus, when writing pressure is applied to the core, the flexible piece is pressed against the inner surface of the shaft cylinder and elastically deforms so as to extend in the axial direction, thereby widening the distance between the front end portion and the rear end portion of the elastic deformation portion. be able to.
In addition, when a plurality of flexible pieces are evenly arranged on the outer periphery of the bulging portion, when writing pressure is applied to the core, a plurality of flexible pieces can be gripped and written at any position in the circumferential direction. One of the flexible pieces is pressed against the inner surface of the shaft cylinder to start elastic deformation, and the other adjacent flexible pieces successively start to elastically deform one after the other, and the entire flexible piece extends along the axis. The mouth can be moved forward, and core breakage can be prevented regardless of the position where the writing instrument is held.

前記連結部材の前方部と前記芯繰出機構に設けた段部との間に弾発部材を配し、前記弾発部材により前記芯繰出機構を前方へ弾発することで、筆記具を筆記面に対して垂直に近くなるように把持して筆記を行った際、筆圧が高くなると弾発部材が収縮することで芯繰出機構が後退し、芯が先口の先端部で保護され、芯折れを防止することができる。
ここで、筆記具を垂直に立てて筆記した場合、芯に掛かる筆圧はほぼ全て芯の軸心方向に掛かり、芯の軸径方向に掛かる力は限りなく小さくなるため、前記緩衝スプリングのみが作用して芯及び芯繰出機構を後退させて先口の先端部で芯を保護することができる。
また、筆記具の筆記角度を傾けるほど、芯の軸心方向に掛かる力が減少し、その分、芯の軸径方向に働く力が大きくなるため、先口を介して連結部及び芯繰出機構が傾動し、弾性変形部の膨出部が軸筒の内面に圧接されることで弾性変形し、先口が前方に移動することで芯を先口の先端部で保護するものとなる。したがって、筆記面に対して筆記具を傾けるほど筆圧は弾性変形部に伝わり易く、筆記面に対して筆記具を垂直に近づけるほど筆圧は緩衝スプリングに伝わり易くなる。 By arranging a resilient member between the front portion of the connecting member and a step portion provided in the lead feeding mechanism, the lead feeding mechanism is bulleted forward by the resilient member, so that the writing tool is placed against the writing surface. When the writing is performed while gripping so as to be close to vertical, if the writing pressure increases, the elastic member contracts and the lead feeding mechanism retracts, the lead is protected at the tip of the tip, and the lead breaks. Can be prevented.
Here, when writing with the writing tool standing vertically, almost all of the writing pressure applied to the core is applied in the axial direction of the core, and the force applied in the axial direction of the core is extremely small, so only the buffer spring acts. Thus, the lead and the lead feeding mechanism can be retracted to protect the lead at the tip of the tip.
In addition, as the writing angle of the writing instrument is tilted, the force applied in the axial direction of the core decreases, and the force acting in the axial direction of the core increases accordingly, so the connecting portion and the core feeding mechanism are connected via the tip. By tilting, the bulging part of the elastically deforming part is elastically deformed by being pressed against the inner surface of the shaft tube, and the tip is moved forward, thereby protecting the core at the tip of the tip. Therefore, as the writing tool is tilted with respect to the writing surface, the writing pressure is more easily transmitted to the elastic deformation part, and as the writing tool is brought closer to the writing surface perpendicularly, the writing pressure is more easily transmitted to the buffer spring.

本発明では、筆記具を筆記面に対して傾けて筆記した際、芯に過大な筆圧が掛かっても先口が前方に移動することで芯を保護することができ、筆記時に筆記角度や筆圧に気を配らなくても芯折れを防止できる筆記具を提供することが可能になった。 In the present invention, when writing with the writing instrument tilted with respect to the writing surface, even if excessive writing pressure is applied to the lead, the tip can be moved forward so that the lead can be protected. It has become possible to provide a writing instrument that can prevent core breakage without paying attention to pressure.

本実施例のシャープペンシルの側面図である。It is a side view of the mechanical pencil of a present Example. 図１の縦端面図である。FIG. 2 is a vertical end view of FIG. 1. 要部を拡大した縦端面図である。It is the vertical end view which expanded the principal part. 図４は、図３のＡ−Ａ線端面図である。FIG. 4 is an end view taken along line AA in FIG. 図２のシャープペンシルにおける弾性変形部材の端面図であり、図５Ａは、弾性変形部材の通常状態を示す端面図で、図５Ｂは、弾性変形部材が伸びた状態を示す端面図である。5A and 5B are end views of the elastic deformation member in the mechanical pencil of FIG. 2, FIG. 5A is an end view showing a normal state of the elastic deformation member, and FIG. 5B is an end view showing a state where the elastic deformation member is extended. 図１のシャープペンシルの筆記角度を筆記面に対して６０°に傾けて筆記を行う状態を示した要部端面図である。It is the principal part end view which showed the state which inclines the writing angle of the mechanical pencil of FIG. 1 at 60 degrees with respect to a writing surface, and performs writing. 図６の筆記状態で芯に過大な筆圧が掛って先口が前方に移動した状態を示す要部端面図である。It is a principal part end elevation which shows the state which applied the excessive writing pressure to the core in the writing state of FIG. 6, and the tip moved to the front. 図１のシャープペンシルを筆記面に対して垂直に立てて筆記を行う状態を示した要部端面図である。It is the principal part end elevation which showed the state which stands up perpendicularly | vertically with respect to a writing surface, and performs writing. 図８の筆記状態で芯に過大な筆圧が掛って芯と芯繰出機構が後退した状態を示す要部端面図である。FIG. 9 is an end view of a main part showing a state where an excessive writing pressure is applied to the lead in the writing state of FIG. 8 and the lead and the lead feeding mechanism are retracted.

以下、図１〜図９に基づいて本実施例の筆記具を説明する。尚、説明を分かり易くするために、図面中の同様の部材、同様の部分については同じ符号を付してある。本実施例の説明においては、筆記具として、シャープペンシルを用いて説明し、シャープペンシルの先口がある側を前方と表現し、その反対側を後方と表現する。
尚、本実施例におけるシャープペンシルでは、筆記する前の状態において軸筒の軸心と軸筒以外の部品の軸心とが一致した状態で構成する。 Hereinafter, the writing instrument of the present embodiment will be described with reference to FIGS. In addition, in order to make explanation easy to understand, the same code | symbol is attached | subjected about the same member and the same part in drawing. In the description of this embodiment, a mechanical pencil will be used as a writing instrument, and the side of the mechanical pencil with the front opening will be expressed as the front and the opposite side will be expressed as the rear.
Note that the mechanical pencil in the present embodiment is configured in a state in which the axis of the shaft cylinder and the axis of parts other than the shaft cylinder match in a state before writing.

図１に示すように本実施例の筆記具であるシャープペンシル１は、軸筒２の前方に先口３を配し、先口３の後方でかつ軸筒２内に芯繰出機構を内蔵し、芯繰出機構で狭持される芯１１を先口３の先端部３ｄから突出させ、軸筒２の中に後方から挿入されたノック部材５を装着し、ノック部材５を前方に押圧することで芯１１が前方へ繰り出されるように構成してある。 As shown in FIG. 1, the mechanical pencil 1 as a writing instrument of the present embodiment has a front end 3 arranged in front of the shaft tube 2, and a lead feeding mechanism is built in the shaft tube 2 behind the front port 3, By causing the core 11 held by the core feeding mechanism to protrude from the distal end portion 3d of the front opening 3, the knock member 5 inserted from the rear into the shaft tube 2 is mounted, and the knock member 5 is pressed forward. The core 11 is configured to be drawn forward.

次に図２及び図３を用いて本実施例のシャープペンシル１の各構成の説明を行う。芯繰出機構４について詳述すると、前後に貫通した貫通孔を有する筒状部材６の先端孔６ａに前部が複数に分割されたチャック７を挿入し、チャック７の頭部７ａに締具８を外嵌し、チャック７の後部にパイプ状の芯タンク９を圧入固着する。また、筒状部材６の内鍔６ｂと芯タンク９の前端との間に取付時荷重が４００ｇ程度のチャックスプリング１０を取り付け、チャック７と締具８と筒状部材６と芯タンク９とチャックスプリング１０とで芯１１を繰り出すための芯繰出機構４を構成する。 Next, each configuration of the mechanical pencil 1 of the present embodiment will be described with reference to FIGS. The core feeding mechanism 4 will be described in detail. A chuck 7 having a front portion divided into a plurality of tip holes 6a of a cylindrical member 6 having a through-hole penetrating in the front-rear direction is inserted, and a fastener 8 is inserted into a head 7a of the chuck 7. And a pipe-shaped core tank 9 is press-fitted and fixed to the rear portion of the chuck 7. A chuck spring 10 having a load of about 400 g is attached between the inner flange 6b of the cylindrical member 6 and the front end of the core tank 9, and the chuck 7, the fastener 8, the cylindrical member 6, the core tank 9, and the chuck are loaded. A lead feeding mechanism 4 for feeding the lead 11 together with the spring 10 is configured.

また、前記芯出機構４は軸方向に延び中心に貫通孔を有する連結部材１２の先端内孔１２ａから挿入され、前記筒状部材６に設けた外鍔６ｃの段部６ｄと連結部材１２の先端内孔の段部１２ｂとの間に、取付時荷重３５０ｇ程度の緩衝スプリング１３を弾発部材として取り付け、連結部材１２の先端内孔の段部１２ｂに対して芯繰出機構４を前方に弾発してある。また、連結部材１２の前方に段状に形成した貫通孔を有するガイド部材１４を配設し、ガイド部材１４の後部に設けた雌螺子部１４ａと連結部材１２の前部に設けた第１の雄螺子部１２ｃとを着脱可能に螺着する。このとき、筒状部材６の外鍔６ｃがガイド部材１４の後段部１４ｂと当接し、芯繰出機構４の前方への移動が阻止される。更に、締具８は筒状部材６の前端部６ｅとガイド部材１４の内孔段部１４ｃとの間で長手方向に適宜移動可能に遊嵌される。 The centering mechanism 4 extends in the axial direction and is inserted from the tip inner hole 12a of the connecting member 12 having a through hole at the center, and the step 6d of the outer flange 6c provided in the cylindrical member 6 and the connecting member 12 A buffer spring 13 having a mounting load of about 350 g is attached as a resilient member between the stepped portion 12b of the distal end inner hole, and the core feeding mechanism 4 is moved forward with respect to the stepped portion 12b of the distal end inner hole of the connecting member 12. It has been issued. A guide member 14 having a stepped through hole formed in front of the connecting member 12 is disposed, and a female screw portion 14 a provided at the rear portion of the guide member 14 and a first portion provided at the front portion of the connecting member 12. The male screw part 12c is detachably screwed. At this time, the outer flange 6c of the cylindrical member 6 comes into contact with the rear stage portion 14b of the guide member 14, and the forward movement of the core feeding mechanism 4 is prevented. Further, the fastener 8 is loosely fitted between the front end portion 6e of the cylindrical member 6 and the inner hole step portion 14c of the guide member 14 so as to be appropriately movable in the longitudinal direction.

更に、連結部材１２は前記した軸筒２の前部内孔２ａから挿入され、軸筒２の後部内面２ｂに設けた段状の係止部２ｃに連結部材１２の後部の被係止部１２ｄを圧入固着してある。また、芯タンク９は連結部材１２の後端より後方へ突出するよう形成され、芯タンク９の後部に前記したノック部材５を着脱可能に装着する。
本実施例においては、連結部材１２及び芯繰出機構４の芯タンク９を軟質材である合成樹脂で形成することで、連結部材１２及び連結部材１２内に内包した芯繰出機構４の芯タンク９が撓み、係止部２ｃを支点にして連結部材１２と芯繰出機構４とが傾動するように構成される。 Further, the connecting member 12 is inserted from the front inner hole 2 a of the shaft cylinder 2, and the locked portion 12 d at the rear of the connecting member 12 is connected to the stepped locking portion 2 c provided on the rear inner surface 2 b of the shaft cylinder 2. It is press-fit. The lead tank 9 is formed so as to protrude rearward from the rear end of the connecting member 12, and the knock member 5 described above is detachably attached to the rear portion of the lead tank 9.
In the present embodiment, the connecting member 12 and the lead tank 9 of the lead feeding mechanism 4 are formed of a synthetic resin, which is a soft material, so that the lead tank 9 of the lead feeding mechanism 4 included in the connecting member 12 and the connecting member 12 is used. Is bent and the connecting member 12 and the core feeding mechanism 4 are configured to tilt with the locking portion 2c as a fulcrum.

ガイド部材１４の前方に前記した先口３を配設し、先口３の内孔に設けた摺動部３ａにガイド部材１４の前部外周部１４ｄを挿入して、先口３をガイド部材１４の軸心に沿った方向へ摺動可能に構成してある。また、先口３の内孔の先段部３ｂには芯１１を１０ｇ程度の力で保持する芯保持部材１５が内蔵される。更に先口３と連結部材１２の間に、先口３と連結部材１２とを繋ぐ弾性変形部材１６を配設し、弾性変形部材１６の前部に筒状に形成した前端部１６ａを先口３の後段部３ｃに圧入固着するとともに、弾性変形部材１６の後部に筒状の後端部１６ｂを形成し、後端部１６ｂの内面に設けた雌螺子部１６ｃを連結部材１２の外周に設けた第２の雄螺子部１２ｅに着脱可能に螺着して連結させる。 The front port 3 is disposed in front of the guide member 14, and the front outer peripheral portion 14 d of the guide member 14 is inserted into the sliding portion 3 a provided in the inner hole of the front port 3, so that the front port 3 is connected to the guide member 3. It is configured to be slidable in a direction along 14 axial centers. In addition, a lead holding member 15 that holds the lead 11 with a force of about 10 g is built in the leading step portion 3 b of the inner hole of the tip 3. Further, an elastic deformation member 16 that connects the front opening 3 and the connection member 12 is disposed between the front opening 3 and the connection member 12, and a front end portion 16 a formed in a cylindrical shape at the front portion of the elastic deformation member 16 is provided at the front opening. 3 is press-fitted and fixed to the rear stage portion 3c, a cylindrical rear end portion 16b is formed at the rear portion of the elastic deformation member 16, and a female screw portion 16c provided on the inner surface of the rear end portion 16b is provided on the outer periphery of the connecting member 12. The second male screw portion 12e is detachably screwed and connected.

弾性変形部材１６は図４及び図５Ａに示すように、膨出部１６ｄを外方に向かって膨出する８個の可撓片１６ｅで構成し、８個の可撓片１６ｅは膨出部１６ｄの外周上に均等に配置されて形成される。また、可撓片１６ｅは頂部１６ｆを外方に向かって膨出する鉤状に形成し、可撓片１６ｅの頂部１６ｆは軸筒２の前部内面２ｄに当接するよう構成される。更に、頂部１６ｆには凹状の溝部１６ｇを形成してあり、可撓片１６ｅの頂部１６ｆが軸筒２の前部内面２ｄに当接した際、溝部１６ｇにより頂部１６ｆは直線部１６ｈより薄く形成されていることから、図５Ｂのように頂部１６ｆを基点にして、直線部１６ｈを維持したまま可撓片１６ｅが軸心方向に伸びるように弾性変形し、弾性変形部材１６の前端部１６ａと後端部１６ｂとが互いに離れるように移動する。
本実施例において弾性変形部材１６は、金属材料を用いてプレス加工により成形し、可撓片１６ｅに３００ｇ程度の力が掛かったときに弾性変形が始まるようにした。
尚、弾性変形部材１６は軸筒２内に挿入される際、可撓片１６ｅの頂部１６ｆが軸筒２の前部内面２ｄに当接し、少し変形した状態で取り付けられる。これにより、軸筒２や弾性変形部材１６の寸法にばらつきが生じても可撓片１６ｅと軸筒２の前部内面２ｄとを当接させることができ、軸筒２の軸心と弾性変形部材１６及び弾性変形部材１６に固着している先口３の軸心とが一致した状態に誘導される As shown in FIGS. 4 and 5A, the elastic deformation member 16 includes eight flexible pieces 16e that bulge outwardly from the bulging portion 16d, and the eight flexible pieces 16e include the bulging portion. It is formed evenly on the outer periphery of 16d. The flexible piece 16e is formed in a bowl shape that bulges outward from the top portion 16f, and the top portion 16f of the flexible piece 16e is configured to contact the front inner surface 2d of the shaft tube 2. Furthermore, a concave groove portion 16g is formed in the top portion 16f, and when the top portion 16f of the flexible piece 16e contacts the front inner surface 2d of the shaft tube 2, the top portion 16f is formed thinner than the straight portion 16h by the groove portion 16g. Therefore, as shown in FIG. 5B, the flexible piece 16e is elastically deformed so as to extend in the axial direction while maintaining the straight portion 16h with the top portion 16f as a base point, and the front end portion 16a of the elastic deformation member 16 and The rear end portion 16b moves away from each other.
In this embodiment, the elastically deformable member 16 is formed by pressing using a metal material, and elastic deformation starts when a force of about 300 g is applied to the flexible piece 16e.
When the elastic deformation member 16 is inserted into the shaft cylinder 2, the top 16f of the flexible piece 16e abuts on the front inner surface 2d of the shaft cylinder 2 and is attached in a slightly deformed state. Thereby, even if the dimensions of the shaft cylinder 2 and the elastic deformation member 16 vary, the flexible piece 16e and the front inner surface 2d of the shaft cylinder 2 can be brought into contact with each other. The member 16 and the axial center of the tip 3 fixed to the elastic deformation member 16 are guided to coincide with each other.

次に、図２を用いて本実施例のシャープペンシル１で芯１１を繰り出す状況を説明する。図２は芯１１を先口３の先端部３ｄより繰り出した状態を示した縦断面図であり、図２の
芯繰り出し状態において、筆記を行い芯１１が摩耗した場合には、ノック部材５を前方に押圧するノック操作を行うことで、芯タンク９と共にチャック７及び締具８が前進し、締具８が前進した距離だけ芯１１が繰り出される。その後、ガイド部材１４の内孔段部１４ｃに締具８が当接して締具８の前進が止まり、チャック７の頭部７ａが締具８から外れて拡開し、更にノックを続けるとチャック７の頭部７ａが芯保持部材１５に当接してチャック７の前進が停止する。
ノック部材５への押圧を緩めるとチャックスプリング１０が伸びることでチャック７が後退し、チャック７の頭部７ａが締具８に押圧され、チャック７が閉じられて再び芯１１を狭持し、図２の芯１１が先口３より繰り出された状態を維持して筆記を可能とする。 Next, the situation where the lead 11 is fed out with the mechanical pencil 1 of this embodiment will be described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a state in which the lead 11 is drawn out from the tip 3d of the leading end 3. In the lead-out state shown in FIG. By performing a knocking operation that pushes forward, the chuck 7 and the fastener 8 move forward together with the lead tank 9, and the lead 11 is fed out by the distance the fastener 8 advances. Thereafter, the fastener 8 comes into contact with the inner hole step portion 14c of the guide member 14 and the advancement of the fastener 8 stops, the head 7a of the chuck 7 disengages from the fastener 8 and expands. 7 head 7a comes into contact with the core holding member 15 and the advance of the chuck 7 is stopped.
When the pressure on the knocking member 5 is loosened, the chuck spring 10 extends, the chuck 7 moves backward, the head 7a of the chuck 7 is pressed against the fastener 8, the chuck 7 is closed, and the core 11 is held again. Writing is possible while maintaining the state in which the core 11 in FIG.

次に、図６及び図７を用いて本実施例のシャープペンシル１を筆記面１００に対して６０°傾けて筆記する場合を説明する。
図６のように、シャープペンシル１を筆記面１００に対して６０°傾けて筆記を行うと、通常の筆記圧（２００ｇ〜３００ｇ程度）では把持している軸筒２の軸心と先口３の軸心の位置が一致した状態で筆記することができ、３００ｇを超えた筆記圧が芯１１に掛かると、軸筒２の係止部２ｃ（図２参照）を支点にして連結部材１２及び芯繰出機構４が撓むことで先口３が前部内面２ｄに近づくように傾動する。更に、弾性変形部材１６における可撓片１６ｅの頂部１６ｆが軸筒２の前部内面２ｄに圧接されるため、可撓片１６ｅが鉤状から直線状に軸心に沿った方向へ伸びるように弾性変形し、弾性変形部材１６の前端部１６ａと後端部１６ｂとの距離が広がる。このとき、弾性変形部１６の後端部１６ｂは連結部材１２に螺着され、連結部材１２は軸筒２に圧入固着していることから、使用者が把持している軸筒２に対して連結部材１２が移動することはなく、弾性変形部材１６の前端部１６ａと共に先口３がガイド部材１４の前部外周部１４ｄに沿って前方へ移動することで、図７に示すように、先口３の先端部３ｄにより筆記中の芯１１が保護されて芯１１が折れることを防止できる。
図７の状態から芯１１に掛かる筆圧を解除すると、弾性変形することで直線状に伸びていた可撓片１６ｅが元の鉤状に戻るため、弾性変形部材１６に固定されている先口３も後退し芯１１が露出すると共に、傾動していた連結部材１２と芯繰出機構４の軸心が、軸筒２の軸心と一致するように移動し、図６の状態に戻る。
本実施例のシャープペンシル１は、筆記角度を傾けるほど芯に対する軸心方向へ力が減少し、芯の軸径方向に働く力が大きくなる。このため、シャープペンシル１を傾けるほど芯１１に掛かる筆圧は先口３を介して弾性変形部材１６に伝わり易くなり、弾性変形部材１６が芯１１の軸心方向に伸びるように弾性変形して先口３を前方に移動させ易くなる。 Next, the case where writing is performed with the mechanical pencil 1 of this embodiment tilted by 60 ° with respect to the writing surface 100 will be described with reference to FIGS. 6 and 7.
As shown in FIG. 6, when writing is performed with the mechanical pencil 1 tilted by 60 ° with respect to the writing surface 100, the shaft center and the tip 3 of the shaft cylinder 2 that is gripped with a normal writing pressure (about 200 g to 300 g). When the writing pressure exceeding 300 g is applied to the core 11, the connecting member 12 and the locking member 2c (see FIG. 2) of the shaft tube 2 are used as fulcrums. When the lead feeding mechanism 4 is bent, the tip 3 is tilted so as to approach the front inner surface 2d. Further, since the top portion 16f of the flexible piece 16e in the elastic deformation member 16 is pressed against the front inner surface 2d of the shaft tube 2, the flexible piece 16e extends from the bowl shape to the direction along the axis from the hook shape. It elastically deforms and the distance between the front end portion 16a and the rear end portion 16b of the elastic deformation member 16 increases. At this time, the rear end portion 16b of the elastically deformable portion 16 is screwed to the connecting member 12, and the connecting member 12 is press-fitted and fixed to the shaft tube 2, so that the shaft tube 2 gripped by the user is fixed. The connecting member 12 does not move, and the tip 3 moves forward along the front outer peripheral portion 14d of the guide member 14 together with the front end portion 16a of the elastically deformable member 16, and as shown in FIG. The leading edge 3d of the mouth 3 protects the core 11 being written and can prevent the core 11 from breaking.
When the writing pressure applied to the core 11 is released from the state of FIG. 7, the flexible piece 16 e that has been linearly extended by elastic deformation returns to the original bowl shape, so that the front end fixed to the elastic deformation member 16 3 also moves backward so that the core 11 is exposed, and the tilted connecting member 12 and the axis of the core feeding mechanism 4 move so as to coincide with the axis of the shaft cylinder 2 to return to the state of FIG.
In the mechanical pencil 1 of the present embodiment, the force decreases in the axial direction with respect to the core as the writing angle is inclined, and the force acting in the axial direction of the core increases. For this reason, as the mechanical pencil 1 is tilted, the writing pressure applied to the core 11 is more easily transmitted to the elastic deformation member 16 via the tip 3, and the elastic deformation member 16 is elastically deformed so as to extend in the axial direction of the core 11. It becomes easy to move the tip 3 forward.

次に、図８及び図９を用いて、本実施例のシャープペンシル１を筆記面１００に対して垂直（９０°）に立てて筆記した場合について説明する
図８に示すように、シャープペンシル１を傾けずに筆記面１００に対して垂直に立てた状態で筆記を行う場合、シャープペンシル１を傾けて筆記しているときのように芯１１に掛かった筆圧は弾性変形部材１６にはほとんど伝わらないため、先口３が前進することはない。そこで、芯１１に３５０ｇ以上の筆圧が掛かると、芯１１を狭持している芯繰出機構４に力が伝わり、芯繰出機構４を前方に弾発している緩衝スプリング１３が収縮することで芯繰出機構４が後退する。このとき先口３の中段部３ｅはガイド部材１４の先端１４ｅと当接しているため後退することはなく、図９に示すように、先口３に対して芯１１と芯繰出機構４のみが後退し、先口３の先端部３ｄで芯１１が保護される。
図９の状態から芯１１に掛かる筆圧を解除すると、緩衝スプリング１３が伸びることで芯１１と芯繰出機構４が前進し、先口３の先端部３ｄから芯１１が突出して図８の状態に戻る。このとき、芯１１と共に芯１１を芯保持部材１５で保持している先口３も前進しようとするが、芯保持部材１５の芯保持力は１０ｇ程度と弱く設定しているため弾性変形部材１６の可撓片１６ｅを変形させることができず先口３が前方へ移動することはない。 Next, the case where the mechanical pencil 1 of this embodiment is written vertically (90 °) with respect to the writing surface 100 will be described with reference to FIGS. 8 and 9. As shown in FIG. When writing is performed in a state where the writing is performed vertically with respect to the writing surface 100 without tilting, the writing pressure applied to the core 11 is almost not applied to the elastic deformation member 16 as when writing with the mechanical pencil 1 tilted. Since it is not transmitted, the tip 3 does not move forward. Therefore, when a writing pressure of 350 g or more is applied to the lead 11, force is transmitted to the lead feeding mechanism 4 that holds the lead 11, and the buffer spring 13 that repels the lead feeding mechanism 4 forward contracts. The lead feeding mechanism 4 moves backward. At this time, the middle step portion 3e of the tip 3 does not move backward because it is in contact with the tip 14e of the guide member 14, and only the lead 11 and the lead feeding mechanism 4 are located with respect to the tip 3, as shown in FIG. The lead 11 is retracted, and the lead 11 is protected by the tip 3d of the tip 3.
When the writing pressure applied to the core 11 is released from the state of FIG. 9, the buffer spring 13 extends to advance the core 11 and the core feeding mechanism 4, and the core 11 protrudes from the distal end portion 3 d of the front end 3. Return to. At this time, the tip 11 that holds the core 11 with the core holding member 15 also moves forward together with the core 11, but the core holding force of the core holding member 15 is set as weak as about 10 g, so that the elastic deformation member 16 The flexible piece 16e cannot be deformed, and the tip 3 does not move forward.

また、シャープペンシル１を傾けて筆記する場合でも芯１１を介して芯繰出機構４に筆圧が伝わるため、緩衝スプリング１３が収縮することで芯１１及び芯１１を狭持している芯繰出機構４を後退させるが、シャープペンシル１を傾けるほど芯１１に掛かる筆圧のうち、芯１１の軸心方向に掛かる力は減少するため、緩衝スプリング１３を収縮するには緩衝スプリングの取付加重（３５０ｇ）より高い筆圧が必要になる。これは筆記角度を傾けるほど大きくなり、逆に筆記角度を垂直に近づけるほど取付加重（３５０ｇ）に近くなるものである。
つまり、本実施例における緩衝スプリング１３と弾性変形部材１６の関係性は、筆記角度を垂直に近づけるほど緩衝スプリング１３が収縮し易くなり、芯１１を後退させて芯１１を保護し、筆記角度を傾けるほど弾性変形部材１６に力が伝わり易くなり、弾性変形部材１６の可撓片１６ｅが伸びることで先口３を前進させ、芯１１を保護するものである。
したがって、高い筆記圧で筆記する場合でも筆記角度に気をつけることなく筆記することが可能な筆記具を提供することが可能となった。 Further, even when writing with the mechanical pencil 1 tilted, the pen pressure is transmitted to the lead feeding mechanism 4 via the lead 11, so that the lead 11 and the lead 11 are held by the buffer spring 13 contracting. 4, the force applied to the core 11 in the axial direction of the writing pressure applied to the core 11 decreases as the mechanical pencil 1 is tilted. ) Higher writing pressure is required. This increases as the writing angle is tilted, and conversely, the closer the writing angle is to the vertical, the closer to the attachment weight (350 g).
That is, the relationship between the buffer spring 13 and the elastic deformation member 16 in the present embodiment is that the buffer spring 13 is more easily contracted as the writing angle is made closer to the vertical, and the core 11 is retracted to protect the core 11 and the writing angle is increased. As the tilt is increased, the force is easily transmitted to the elastic deformation member 16, and the flexible piece 16 e of the elastic deformation member 16 extends to advance the tip 3 and protect the core 11.
Therefore, even when writing with a high writing pressure, it has become possible to provide a writing instrument that can be written without paying attention to the writing angle.

本発明による筆記具の構造は、シャープペンシルの他、棒状物の繰出機構を有する色鉛筆、クレヨン、チョークなどの筆記可能な芯を繰り出す機構を有する筆記具などに使用が可能である。 The structure of the writing instrument according to the present invention can be used for a writing instrument having a mechanism for feeding out a writable core such as a colored pencil, a crayon, and a chalk having a stick-like feeding mechanism in addition to a mechanical pencil.

１…シャープペンシル、
２…軸筒、２ａ…前部内孔、２ｂ…後部内面、２ｃ…係止部、２ｄ…前部内面、
３…先口、３ａ…摺動部、３ｂ…先段部、３ｃ…後段部、３ｄ…先端部、３ｅ…中段部、４…芯繰出機構、
５…ノック部材、
６…筒状部材、６ａ…先端口、６ｂ…内鍔、６ｃ…外鍔、６ｄ…段部、６ｅ…前端部、
７…チャック、７ａ…頭部、
８…締具、
９…芯タンク、
１０…チャックスプリング、
１１…芯、
１２…連結部材、１２ａ…先端内孔、１２ｂ…段部、１２ｃ…第１の雄螺子部、
１２ｄ…被係止部、１２ｅ…第２の雄螺子部、
１３…緩衝スプリング、
１４…ガイド部材、１４ａ…雌螺子部、１４ｂ…後段部、１４ｃ…内孔段部、
１４ｄ…前部外周部、１４ｅ…先端、
１５…芯保持部材、
１６…弾性変形部材、１６ａ…前端部、１６ｂ…後端部、１６ｃ…雌螺子部、
１６ｄ…膨出部、１６ｅ…可撓片、１６ｆ…頂部、１６ｇ…溝部、１６ｈ…直線部、
１００…筆記面。 1 ... mechanical pencil,
2 ... shaft cylinder, 2a ... front inner hole, 2b ... rear inner surface, 2c ... locking portion, 2d ... front inner surface,
3 ... front opening, 3a ... sliding part, 3b ... front step part, 3c ... rear stage part, 3d ... tip part, 3e ... middle stage part, 4 ... core feeding mechanism,
5 ... knock member,
6 ... cylindrical member, 6a ... tip end, 6b ... inner collar, 6c ... outer collar, 6d ... stepped section, 6e ... front end section,
7 ... chuck, 7a ... head,
8 ... Fasteners,
9 ... Core tank,
10 ... Chuck spring,
11 ... Core
12 ... Connecting member, 12a ... Inner end hole, 12b ... Stepped portion, 12c ... First male screw portion,
12d: locked portion, 12e: second male screw portion,
13: Buffer spring,
14 ... Guide member, 14a ... Female screw part, 14b ... Rear stage part, 14c ... Inner hole step part,
14d: front outer periphery, 14e: tip,
15 ... Core holding member,
16 ... Elastic deformation member, 16a ... Front end part, 16b ... Rear end part, 16c ... Female screw part,
16d ... bulge part, 16e ... flexible piece, 16f ... top part, 16g ... groove part, 16h ... straight part,
100 ... Writing surface.

Claims

軸筒内に芯繰出機構を配設し、前記芯繰出機構を作動させることで前記軸筒内の芯を該軸筒の前方に設けた先口の先端部より繰り出す構造の筆記具において、前記先口の後方に、前端部が該先口の後方部と連設し且つ後端部が前記軸筒の内方に設けた連結部または前記芯繰出機構の前方部と連設する弾性変形部を設け、前記弾性変形部に外方へ膨出する膨出部を形成し、芯に筆圧が掛かった際、前記弾性変形部の膨出部が前記軸筒の内面に圧接されて弾性変形することで該弾性変形部の前端部と後端部との距離が軸心に沿った方向へ広がると共に、前記弾性変形部に連設した前記先口が前記芯繰出機構に対して前方へ移動し、前記芯の前端部が前記先口の先端部で保護されることを特徴とした筆記具 In the writing instrument having a structure in which a lead feeding mechanism is disposed in the shaft cylinder, and the lead in the shaft cylinder is fed out from a tip end portion provided in front of the shaft cylinder by operating the lead feeding mechanism. An elastically deforming portion having a front end portion connected to the rear portion of the front opening and a rear end portion provided inward of the shaft cylinder or a front portion of the core feeding mechanism at the rear of the mouth. Forming a bulging portion that bulges outward on the elastic deformation portion, and when the pen pressure is applied to the core, the bulging portion of the elastic deformation portion is pressed against the inner surface of the shaft tube and elastically deforms As a result, the distance between the front end portion and the rear end portion of the elastically deforming portion widens in the direction along the axial center, and the tip opening connected to the elastically deforming portion moves forward with respect to the core feeding mechanism. A writing instrument, wherein the front end of the lead is protected by the tip of the tip.

前記軸筒の内面に内方へ突出した係止部を形成し、前記軸筒の係止部と前記連結部の外面に設けた被係止部とを係止し、前記軸筒の係止部を支点にして前記連結部材を軸心と直交方向に傾動可能に構成したことを特徴とする請求項１に記載の筆記具。 A locking portion projecting inwardly is formed on the inner surface of the shaft tube, and the locking portion of the shaft tube and a locked portion provided on the outer surface of the connecting portion are locked. 2. The writing instrument according to claim 1, wherein the connecting member is configured to be tiltable in a direction orthogonal to the axis with the portion as a fulcrum.

前記芯繰出機構の前方に、側面が前記先口の内面と摺接するガイド部を連設したことを特徴とする請求項１または請求項２に記載の筆記具。 The writing instrument according to claim 1 or 2, wherein a guide portion whose side surface is in sliding contact with the inner surface of the tip is provided in front of the lead feeding mechanism.

前記弾性変形部の膨出部の少なくとも一部が前記軸筒の内面と常に当接するよう構成したことを特徴とする請求項１ないし請求項３のいずれか１項に記載の筆記具。 The writing instrument according to any one of claims 1 to 3, wherein at least a part of the bulging portion of the elastically deforming portion is configured to always come into contact with an inner surface of the shaft cylinder.

前記弾性変形部の膨出部が複数の可撓片からなることを特徴とする請求項１ないし請求項４のいずれか１項に記載の筆記具。 The writing instrument according to any one of claims 1 to 4, wherein the bulging part of the elastically deforming part is composed of a plurality of flexible pieces.

前記連結部材の前方部と前記芯繰出機構に設けた段部との間に弾発部材を配し、前記弾発部材により前記芯繰出機構を前方へ弾発したことを特徴とする請求項１ないし請求項５のいずれか１項に記載の筆記具。 2. A resilient member is disposed between a front portion of the connecting member and a step portion provided in the lead feeding mechanism, and the lead feeding mechanism is bulleted forward by the resilient member. The writing instrument according to any one of claims 5 to 5.