JP3701897B2

JP3701897B2 - Writing instrument grip

Info

Publication number: JP3701897B2
Application number: JP2001352488A
Authority: JP
Inventors: 亮松川
Original assignee: セーラー万年筆株式会社
Priority date: 2001-11-19
Filing date: 2001-11-19
Publication date: 2005-10-05
Anticipated expiration: 2021-11-19
Also published as: JP2003145983A

Description

【０００１】
【発明の属する技術分野】
本発明は、筆記具の軸筒の把持部外周に配置される筒状のグリップに関するものである。
【０００２】
【従来の技術】
筆記時に指先を軸筒に確実にフィットさせて書き易くするために軸筒の把持部外周に弾性に富んだ材料からなる筒状のグリップが配置されることが多い。また、このグリップを軸筒に取り付けることにより、外観形状が変化に富むので、意匠的要素としての機能も有する。
【０００３】
【発明が解決しようとする課題】
筒状のグリップを軸筒に保持する構造は、軸筒の把持部分に小径部を形成し、この小径部に嵌め込まれたグリップを小径部の先端に形成された円環突起と後端に形成された段部で挟圧して保持するものが多い。従って、組立時には、軸筒の前方からグリップを差し込み、グリップを弾性変形させて内径を拡開させた状態で円環突起を乗り越えて小径部に嵌め込む。
【０００４】
このため、グリップがシリコンゴムのように弾性に富んだ材料で形成されている場合は比較的容易に組立てることができるが、比較的硬質の合成樹脂で成形されている場合は、弾性変形量が少ないので、円環突起とグリップが嵌め込まれる小径部外周面の半径の差、つまり小径部の外周面から円環突起の頂部までの高さが大きいとグリップを大きく弾性変形させる必要があるので組立てが困難である。しかし、この高さを低くすると使用中にグリップが抜け落ち易い不具合が生じる。すなわち、グリップが比較的硬質の合成樹脂で成形されている場合は、組立ての容易さと確実な保持を両立させるのはなかなか困難である。
【０００５】
そこで本発明は、グリップが比較的硬質の合成樹脂で成形されている場合において、組立ての容易さと確実な保持を両立させることが可能な筆記具用グリップを提供することを目的とする。
【０００６】
【課題を解決するための手段】
かかる目的を達成するために、本発明は、軸筒の把持部分に形成された小径部に嵌め込まれ、小径部の先端に形成された円環突起と後端に形成された段部で挟圧されて保持される筆記具用グリップにおいて、グリップ内周面の半径と軸筒の小径部の半径を等しくし、グリップの開口部内面に外部に向かって広がるテーパー部を形成するとともに、円環突起の前方に小径円環突起を連設し、円環突起と小径部外周面の半径の差をＬ３、円環突起と小径円環突起の半径の差をＬ１、グリップ内周面の半径とグリップ開口部の最大半径の差をＬ２とするとき、Ｌ３＞Ｌ２＞Ｌ１、かつ、Ｌ２＞（Ｌ３−Ｌ１）を満たすようにする。
【０００７】
【発明の実施の形態】
以下に、図面に基づいて本発明の実施の形態を具体的に説明する。図５はグリップ２０を軸筒１０に組み付けた状態を示すが、軸筒１０の筆記時における把持部に形成された小径部に嵌め込まれたグリップ２０は、小径部の先端に形成された円環突起１３と後端に形成された段部１２で挟圧されて保持されている。そして、軸筒１０の先端には先口３０が螺着されている。
【０００８】
図１は軸筒１０の要部の断面図を示すが、軸筒１０の筆記時の把持部には小径部１１が形成されている。そして、小径部１１の尾端側に段部１２が形成され、小径部１１の前方側に円環突起１３が形成されている。つまり、小径部１１は段部１２と円環突起１３で画定されている。また、円環突起１３の前方には小径円環突起１４が一体に連設されている。
なお、円環突起１３と小径部１１外周面の半径の差、つまり小径部１１外周面から円環突起１３の頂部までの高さがＬ３であり、円環突起１３と小径円環突起１４の半径の差、つまり円環突起１３の頂部と小径円環突起１４の頂部の高さの差がＬ１である。
小径部１１の外周面には、嵌め込まれたグリップ２０が回転しないように、微小な縦リブ１５が複数本形成されており、更には、軸筒１０の先端には先口用ねじ１６が形成されている。
【０００９】
グリップ２０は、比較的硬質な合成樹脂にて筒状に成形されたものであり、図２に示すように、外周面には円環状の滑り止め突起２１が複数個形成されている。グリップ２０の長さは段部１２と円環突起１３との間の長さに等しく、グリップ２０内周の半径は小径部１１の半径に等しい。そして、グリップ２０の開口部内面には、外側に向けて広がるテーパー部２２が形成されている。
なお、テーパー部２２は片側の開口部内面のみに設けてもよいが、テーパー部２２を片側の開口部内面のみに設けると、グリップ２０は前後に非対称になって組立て時に前後の方向性を確認する必要があるので、両側の開口部内面に設けるのがよい。そして、グリップ２０内周面の半径とグリップ開口部の最大半径の差がＬ２である。
ここで、Ｌ１、Ｌ２、Ｌ３の間には、Ｌ３＞Ｌ２＞Ｌ１、かつ、Ｌ２＞（Ｌ３−Ｌ１）の関係が満たされている。
【００１０】
しかして、組立てに際しては、軸筒１０の先端部をグリップ２０内に挿入するが、Ｌ２＞（Ｌ３−Ｌ１）であるので、つまり、グリップ２０の内径は小径円環突起１４の外径よりも小さいが、グリップ２０開口部の最大内径が小径円環突起１４の外径よりも大きいので、小径円環突起１４の縁部はグリップ２０内に入り込んでテーパー部２２に当接する。この状態でグリップ２０を押し込むとグリップ２０は弾性変形して前進し、図３に示すように、グリップ２０の内周面は小径円環突起１４の外周面に当接する。
【００１１】
更には、Ｌ２＞Ｌ１であるので、円環突起１３の縁部は、図３に示すように、グリップ２０内に入り込んでテーパー部２２に当接する。この状態でグリップ２０を押し込むとグリップ２０は更に弾性変形し、グリップ２０の内周面が円環突起１３の外周面に当接した状態で前進する。そして、グリップ２０が円環突起１３を乗り越えると、グリップ２０はその弾性変形が復元して小径部１１に嵌め込まれる。
【００１２】
このように、小径円環突起１４の縁部および円環突起１３の縁部が組立て過程において、いずれもグリップ２０の端面に当ることなくテーパー部２２に当り、かつ、グリップ２０は２段階にわたって弾性変形して内径が拡大するので、グリップが比較的硬質の合成樹脂で成形されて弾性変形しにくい場合においても、容易に組立てることができる。
そして、Ｌ３＞Ｌ２であるので、図４に示すように、グリップ２０の端部が円環突起１３の側面に当接し、使用中に脱落することを確実に防止することかできる。
【００１３】
【発明の効果】
以上説明したように、本発明は、軸筒の把持部分に形成された小径部に嵌め込まれ、小径部の先端に形成された円環突起と後端に形成された段部で挟圧されて保持される筆記具用グリップにおいて、グリップ内周面の半径と軸筒の小径部の半径を等しくし、グリップの開口部内面に外部に向かって広がるテーパー部を形成するとともに、円環突起の前方に小径円環突起を連設し、円環突起と小径部外周面の半径の差をＬ３、円環突起と小径円環突起の半径の差をＬ１、グリップ内周面の半径とグリップ開口部の最大半径の差をＬ２とするとき、Ｌ３＞Ｌ２＞Ｌ１、かつ、Ｌ２＞（Ｌ３−Ｌ１）を満たすので、グリップが比較的硬質の合成樹脂で成形されている場合において、組立ての容易さと確実な保持を両立させることが可能な筆記具用グリップとすることができる。
【図面の簡単な説明】
【図１】軸筒の要部の断面図である。
【図２】グリップの断面図である。
【図３】組立て過程の説明図である。
【図４】組立て完了時の要部断面図である。
【図５】グリップの組付け状態の説明図である。
【符号の説明】
１０軸筒
１１小径部
１２段部
１３円環突起
１４小径円環突起
１５縦リブ
１６先口用ねじ
２０グリップ
２１滑り止め突起
２２テーパー部
３０先口[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical grip disposed on the outer periphery of a gripping portion of a shaft cylinder of a writing instrument.
[0002]
[Prior art]
A cylindrical grip made of a material rich in elasticity is often arranged on the outer periphery of the gripping portion of the shaft cylinder in order to make it easy to write by securely fitting the fingertip to the shaft cylinder at the time of writing. Further, by attaching this grip to the shaft cylinder, the appearance shape is rich in changes, and thus it also has a function as a design element.
[0003]
[Problems to be solved by the invention]
The structure in which the cylindrical grip is held by the shaft cylinder is formed with a small-diameter portion in the grip portion of the shaft tube, and the grip fitted in the small-diameter portion is formed at the annular protrusion formed at the tip of the small-diameter portion and the rear end. Many of them are clamped and held by the stepped portion. Therefore, at the time of assembly, the grip is inserted from the front of the shaft tube, and the grip is elastically deformed so that the inner diameter is widened.
[0004]
For this reason, when the grip is made of a material rich in elasticity such as silicon rubber, it can be assembled relatively easily. However, when the grip is formed of a relatively hard synthetic resin, the amount of elastic deformation is small. Since there is little, the difference in radius between the annular protrusion and the outer peripheral surface of the small diameter part where the grip is fitted, that is, if the height from the outer peripheral surface of the small diameter part to the top of the annular protrusion is large, the grip must be elastically deformed greatly. Is difficult. However, if this height is lowered, there arises a problem that the grip easily falls off during use. That is, when the grip is formed of a relatively hard synthetic resin, it is difficult to achieve both easy assembly and reliable holding.
[0005]
Accordingly, an object of the present invention is to provide a grip for a writing instrument capable of achieving both easy assembly and reliable holding when the grip is formed of a relatively hard synthetic resin.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the present invention is fitted into a small diameter portion formed in the grip portion of the shaft tube, and is clamped by an annular projection formed at the tip of the small diameter portion and a step portion formed at the rear end. In the grip for a writing instrument that is held, the radius of the inner peripheral surface of the grip is equal to the radius of the small diameter portion of the shaft tube, and a tapered portion that extends outward is formed on the inner surface of the opening of the grip. A small-diameter annular projection is connected in front, the radius difference between the annular projection and the small-diameter outer peripheral surface is L3, the radius difference between the annular projection and the small-diameter annular projection is L1, the radius of the grip inner peripheral surface and the grip opening When the difference in the maximum radius of the part is L2, L3>L2> L1 and L2> (L3-L1) are satisfied.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 5 shows a state in which the grip 20 is assembled to the shaft cylinder 10, but the grip 20 fitted in the small diameter portion formed in the grip portion at the time of writing of the shaft cylinder 10 is a ring formed at the tip of the small diameter portion. The protrusion 13 and the step 12 formed at the rear end are sandwiched and held. A tip 30 is screwed to the tip of the shaft tube 10.
[0008]
FIG. 1 shows a cross-sectional view of the main part of the shaft tube 10, and a small diameter portion 11 is formed in a grip portion when the shaft tube 10 is written. A step portion 12 is formed on the tail end side of the small diameter portion 11, and an annular protrusion 13 is formed on the front side of the small diameter portion 11. That is, the small diameter portion 11 is defined by the step portion 12 and the annular projection 13. In addition, a small-diameter annular protrusion 14 is integrally provided in front of the annular protrusion 13.
The difference in radius between the annular projection 13 and the outer peripheral surface of the small-diameter portion 11, that is, the height from the outer peripheral surface of the small-diameter portion 11 to the top of the annular projection 13 is L3. The difference in radius, that is, the difference in height between the top of the annular projection 13 and the top of the small-diameter annular projection 14 is L1.
A plurality of minute vertical ribs 15 are formed on the outer peripheral surface of the small-diameter portion 11 so that the fitted grip 20 does not rotate, and a tip screw 16 is formed at the tip of the shaft tube 10. Has been.
[0009]
The grip 20 is formed in a cylindrical shape from a relatively hard synthetic resin, and as shown in FIG. 2, a plurality of annular anti-slip protrusions 21 are formed on the outer peripheral surface. The length of the grip 20 is equal to the length between the step portion 12 and the annular projection 13, and the radius of the inner periphery of the grip 20 is equal to the radius of the small diameter portion 11. And the taper part 22 which spreads toward the outer side is formed in the opening part inner surface of the grip 20. As shown in FIG.
The tapered portion 22 may be provided only on the inner surface of the opening portion on one side. However, if the tapered portion 22 is provided only on the inner surface of the opening portion on one side, the grip 20 becomes asymmetrical in the front-rear direction and confirms the front-rear directionality during assembly. Therefore, it is preferable to provide it on the inner surfaces of the openings on both sides. The difference between the radius of the inner peripheral surface of the grip 20 and the maximum radius of the grip opening is L2.
Here, the relationship of L3>L2> L1 and L2> (L3-L1) is satisfied between L1, L2, and L3.
[0010]
Thus, when assembling, the tip end portion of the shaft tube 10 is inserted into the grip 20, but L2> (L3-L1), that is, the inner diameter of the grip 20 is larger than the outer diameter of the small-diameter annular protrusion 14. Although it is small, since the maximum inner diameter of the opening portion of the grip 20 is larger than the outer diameter of the small-diameter annular protrusion 14, the edge of the small-diameter annular protrusion 14 enters the grip 20 and abuts against the tapered portion 22. When the grip 20 is pushed in this state, the grip 20 is elastically deformed and moves forward, and the inner peripheral surface of the grip 20 comes into contact with the outer peripheral surface of the small-diameter annular projection 14 as shown in FIG.
[0011]
Furthermore, since L2> L1, the edge of the annular protrusion 13 enters the grip 20 and contacts the tapered portion 22 as shown in FIG. When the grip 20 is pushed in this state, the grip 20 is further elastically deformed and moves forward with the inner peripheral surface of the grip 20 in contact with the outer peripheral surface of the annular protrusion 13. When the grip 20 gets over the annular projection 13, the elastic deformation of the grip 20 is restored and the grip 20 is fitted into the small diameter portion 11.
[0012]
In this way, the edge of the small-diameter annular projection 14 and the edge of the annular projection 13 both hit the tapered portion 22 without hitting the end face of the grip 20 in the assembly process, and the grip 20 is elastic in two stages. Since the inner diameter is increased by deformation, the grip can be easily assembled even when it is formed of a relatively hard synthetic resin and hardly elastically deforms.
Since L3> L2, as shown in FIG. 4, it is possible to reliably prevent the end portion of the grip 20 from coming into contact with the side surface of the annular projection 13 and falling off during use.
[0013]
【The invention's effect】
As described above, the present invention is fitted into the small diameter portion formed in the gripping portion of the shaft tube, and is clamped by the annular protrusion formed at the tip of the small diameter portion and the step portion formed at the rear end. In the grip for writing instruments to be held, the radius of the inner peripheral surface of the grip and the radius of the small diameter portion of the shaft cylinder are made equal, and a tapered portion is formed on the inner surface of the opening of the grip so as to extend outward, and in front of the annular projection. A small-diameter annular protrusion is provided in series, the difference in radius between the annular protrusion and the small-diameter outer peripheral surface is L3, the difference in radius between the annular protrusion and the small-diameter annular protrusion is L1, and the radius of the grip inner peripheral surface and the grip opening When L2 is the difference in maximum radius, L3>L2> L1 and L2> (L3-L1) are satisfied. Therefore, when the grip is formed of a relatively hard synthetic resin, the assembly is easy and reliable. For writing utensils that can achieve both It can be-up.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a shaft cylinder.
FIG. 2 is a cross-sectional view of a grip.
FIG. 3 is an explanatory diagram of an assembly process.
FIG. 4 is a cross-sectional view of a main part when assembly is completed.
FIG. 5 is an explanatory diagram of an assembled state of the grip.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Shaft cylinder 11 Small diameter part 12 Step part 13 Ring protrusion 14 Small diameter ring protrusion 15 Vertical rib 16 Tip screw 20 Grip 21 Non-slip protrusion 22 Taper part 30 Tip

Claims

In a grip for a writing instrument that is fitted into a small-diameter portion formed in the grip portion of the shaft cylinder and is held by being pressed by an annular protrusion formed at the tip of the small-diameter portion and a step portion formed at the rear end,
A radius of the grip inner peripheral surface is equal to a radius of the small diameter portion,
A tapered portion extending outward is formed on the inner surface of the opening of the grip, and a small-diameter annular protrusion is continuously provided in front of the annular protrusion,
The difference in radius between the annular protrusion and the outer peripheral surface of the small diameter portion is L3, the difference in radius between the annular protrusion and the small diameter annular protrusion is L1, and the difference between the radius of the grip inner peripheral surface and the maximum radius of the grip opening is L2. and when,
L3>L2> L1 and L2> (L3-L1)
A grip for writing instruments.