JP5793838B2

JP5793838B2 - Shaft cylinder

Info

Publication number: JP5793838B2
Application number: JP2010169848A
Authority: JP
Inventors: 好和伊藤
Original assignee: Pentel Co Ltd
Current assignee: Pentel Co Ltd
Priority date: 2010-07-28
Filing date: 2010-07-28
Publication date: 2015-10-14
Anticipated expiration: 2030-07-28
Also published as: JP2012030403A

Description

本発明は、筆記具の軸筒や化粧品の容器などの、螺合により連結し、連結後は螺合解除不可能に固定した軸筒に関する。 The present invention relates to a shaft tube such as a shaft tube of a writing instrument or a cosmetic container, which is connected by screwing and fixed so as to be unscrewable after the connection.

従来、前軸と後軸など、２つの部品を連結した軸筒として、螺合によって連結させるものや凹凸部の係合によって連結させるものが知られている。螺合によって連結した軸筒は、凹凸部の係合によって連結した軸筒に比べ、製造時の部品の成形誤差などによるばらつきの影響を受けにくい。多少のばらつきがあったとしても、螺合させていくことで雄螺子部と雌螺子部の面部同士が接触し、さらに、その螺合完了の際に締めつけを行うことで、ばらつき分の隙間を前記面部同士の接触による強い摩擦力で抑える事が出来るためである。すなわち、螺合によって２つの部品を連結すると、その軸筒は、きつく、ガタもなく連結することが出来る。このため、２つの部品を連結させるだけでなく、固定させたい場合にも、螺合による手段が適している。 2. Description of the Related Art Conventionally, shaft cylinders that connect two components such as a front shaft and a rear shaft are known to be connected by screwing or connected by engagement of an uneven portion. The shaft cylinder connected by screwing is less susceptible to variations due to molding errors of parts during manufacturing, compared to the shaft cylinder connected by engagement of the concave and convex portions. Even if there is some variation, the surface portions of the male screw portion and the female screw portion are brought into contact with each other by being screwed together, and further, by tightening when the screwing is completed, the gap for the variation is eliminated. It is because it can suppress by the strong frictional force by the contact of the said surface parts. That is, when two parts are connected by screwing, the shaft tube can be connected without tightness and play. For this reason, the means by screwing is suitable not only for connecting two parts but also for fixing them.

ここで、螺合により２つの部品を連結させ、その螺合完了後は、螺合解除不能にせしめた軸筒に関する従来技術として、実開平５−３９９８５号公報がある。これは、螺合により連結する軸筒および先筒の互いに対向する面に第１、第２の係合突出部を設け、螺合完了時に第１および第２の係合突出部を係合させるというものである。この第１および第２の係合突出部の螺合回転方向奥側の側面、すなわち、螺合を解除する方向（以下、螺合解除回転方向とする）に軸筒を回転させた際に両係合突出部が当接する側面は、立直面に形成され、第２の係合突出部が第１の係合突出部を乗り越え不能となっている。このため、螺合完了後は、その解除が不可能となり、螺合が緩むことない。結果として、軸筒と先軸が固定される。 Here, Japanese Utility Model Publication No. 5-39985 discloses a related art relating to a shaft cylinder in which two parts are connected by screwing and the screwing is completed after screwing is completed. The first and second engagement protrusions are provided on the mutually opposing surfaces of the shaft cylinder and the front cylinder that are connected by screwing, and the first and second engagement protrusions are engaged when the screwing is completed. That's it. When the shaft cylinder is rotated in the side surface of the first and second engaging protrusions on the inner side in the screwing rotation direction, that is, in the direction in which the screwing is released (hereinafter referred to as the screwing release rotation direction). The side surface with which the engagement protrusion comes into contact is formed in a standing position, and the second engagement protrusion cannot get over the first engagement protrusion. For this reason, after completion of screwing, the release becomes impossible and screwing does not loosen. As a result, the shaft tube and the tip shaft are fixed.

実開平５−３９９８５号公報Japanese Utility Model Publication No. 5-39985

しかし、一般に、螺合による部品の連結においては、先筒などが小さな部品の場合に、螺子の噛む山（螺子山）の数が不十分なことが考えられる。また、螺子を無理抜きによって形成した場合、螺子山の高さが減少してしまい、雄螺子部と雌螺子部の接触力が十分に得られないことも考えられる。
ここで、上記従来技術にあっては、軸筒と先筒との緩み防止すなわち固定を、螺合解除回転方向（軸筒の周方向）で行っていた。このため、先筒を軸筒に挿入する方向を連結方向としたときに、軸筒と先筒とが離脱するように連結方向とは逆の方向に引っ張ってしまうと、その連結方向とは逆の方向においては螺子山による規制しかないため、一方の螺子山が他方の螺子山を乗り越え、簡単に軸筒と先筒が外れてしまう可能性があった。 However, in general, in the connection of parts by screwing, it is considered that the number of threads (threads) that the screw bites is insufficient when the tip tube is a small part. Further, when the screw is formed by forcibly removing it, it is conceivable that the height of the screw thread is reduced and the contact force between the male screw portion and the female screw portion cannot be sufficiently obtained.
Here, in the above-described prior art, the loosening prevention, that is, the fixing between the shaft tube and the tip tube is performed in the screwing release rotation direction (the circumferential direction of the shaft tube). For this reason, when the direction in which the front tube is inserted into the shaft tube is taken as the connecting direction, if the shaft tube and the front tube are pulled away in the direction opposite to the connecting direction, the connecting direction is opposite. In this direction, there is only a restriction by a screw thread, so that one screw thread could get over the other screw thread and the shaft tube and the tip tube could easily be detached.

本発明は、上記問題点に鑑みてなされたものであり、第１の軸筒と第２の軸筒を螺合によって連結してなる軸筒であって、螺合完了時に凸部と凹部とにより係合する係合部を各々の軸筒に設けると共に、前記凹部を窓孔部とし、また、前記係合部の係合する側に、前記連結方向に対して垂直な面部を形成すると共に、前記係合部が、前記軸筒の周方向においても当接することを第１の要旨とする。
そして、第１の軸筒と第２の軸筒を螺合によって連結してなる軸筒であって、螺合完了時に凸部と凹部とにより係合する係合部を各々の軸筒に設けると共に、前記凹部を窓孔部とし、また、前記凸部における前記凹部との係合面の縦断面形状を前記連結方向に対して凹状部を有する形状とすると共に、前記凹部における前記凸部との係合面の縦断面形状を前記凹状部と係合する凸状部を有する形状とし、前記係合部が、前記軸筒の周方向においても当接することを第２の要旨とする。 The present invention has been made in view of the above problems, and is a shaft cylinder formed by connecting a first shaft cylinder and a second shaft cylinder by screwing, and when the screwing is completed, a convex portion and a concave portion are formed. It is provided on the barrel of each of the engaging portion engaged by, the recess and window hole, also on the side of engagement of the engaging portion, thereby forming a vertical surface with respect to the connecting direction The first gist is that the engaging portion abuts also in the circumferential direction of the shaft tube .
Each shaft cylinder is provided with an engaging portion that is engaged with the convex portion and the concave portion when the screwing is completed. In addition, the concave portion is a window hole portion, and the vertical cross-sectional shape of the engagement surface of the convex portion with the concave portion is a shape having a concave portion with respect to the coupling direction, and the convex portion in the concave portion The vertical cross-sectional shape of the engaging surface is a shape having a convex portion that engages with the concave portion, and the second gist is that the engaging portion also contacts in the circumferential direction of the shaft tube .

本発明は、その第１の要旨を、第１の軸筒と第２の軸筒を螺合によって連結してなる軸筒であって、螺合完了時に凸部と凹部とにより係合する係合部を各々の軸筒に設けると共に、前記凹部を窓孔部とし、また、前記係合部の係合する側に、前記連結方向に対して垂直な面部を形成すると共に、前記係合部が、前記軸筒の周方向においても当接するので、螺子山の数、または、その高さが不十分であったとしても、第１の軸筒と第２の軸筒とをその離脱方向、すなわち、第１の軸筒と第２の軸筒との連結方向とは逆の方向に引っ張った際に、第１の軸筒と第２の軸筒とが抜けることがなく、第１の軸筒と第２の軸筒を確実に固定することが出来る。
また、第１の軸筒と第２の軸筒を螺合によって連結してなる軸筒であって、螺合完了時に凸部と凹部とにより係合する係合部を各々の軸筒に設けると共に、前記凹部を窓孔部とし、また、前記凸部における前記凹部との係合面の縦断面形状を前記連結方向に対して凹状部を有する形状とすると共に、前記凹部における前記凸部との係合面の縦断面形状を前記凹状部と係合する凸状部を有する形状とし、前記係合部が、前記軸筒の周方向においても当接するので、一方の係合部の凹状部が他方の係合部の凸状部を覆うように係合するため、第１の軸筒と第２の軸筒とを連結方向とは逆の方向に引っ張ったとしても、より確実に第１の軸筒と第２の軸筒の固定を行うことができる。 The first aspect of the present invention is a shaft cylinder formed by connecting a first shaft cylinder and a second shaft cylinder by screwing, and is engaged by a convex part and a concave part when screwing is completed. A joint portion is provided in each shaft tube, the concave portion is used as a window hole portion, a surface portion perpendicular to the coupling direction is formed on the engaging side of the engaging portion, and the engaging portion However, even in the circumferential direction of the shaft cylinder, even if the number of screw threads or the height thereof is insufficient, the first shaft cylinder and the second shaft cylinder are separated from each other, That is, when the first shaft cylinder and the second shaft cylinder are pulled in the direction opposite to the connecting direction, the first shaft cylinder and the second shaft cylinder do not come out, and the first shaft The cylinder and the second shaft cylinder can be securely fixed.
Each shaft cylinder is provided with an engaging portion that is engaged with the convex portion and the concave portion when the screwing is completed. In addition, the concave portion is a window hole portion, and the vertical cross-sectional shape of the engagement surface of the convex portion with the concave portion is a shape having a concave portion with respect to the coupling direction, and the convex portion in the concave portion The vertical cross-sectional shape of the engaging surface is a shape having a convex portion that engages with the concave portion, and the engaging portion abuts also in the circumferential direction of the shaft cylinder. Since the portion engages so as to cover the convex portion of the other engaging portion, even if the first shaft tube and the second shaft tube are pulled in the direction opposite to the connecting direction, the first shaft tube can be more reliably secured. One shaft cylinder and the second shaft cylinder can be fixed.

第１例の製品全体の外観図である。It is an external view of the whole product of the first example. 図１の縦切断断面図である。It is a longitudinal cross-sectional view of FIG. 第１例の前軸の後方を拡大した縦切断断面図である。It is the longitudinal cross-sectional view which expanded the back of the front shaft of the 1st example. 第１例の後軸の外観図である。It is an external view of the rear axis of the first example. 第１例の前軸と後軸の螺合完了状態を表す縦切断断面図である。It is a longitudinal cross-sectional view showing the screwing completion state of the front shaft and the rear shaft of the first example. 第２例の製品全体の縦切断断面図である。It is a longitudinal cross-sectional view of the entire product of the second example. 第２例の前軸の縦切断断面図である。It is a longitudinal cross-sectional view of the front shaft of the second example. 第２例の後軸の外観図である。It is an external view of the rear axis of the second example. 第２例の前軸と後軸の螺合完了状態を表す縦切断断面図である。It is a longitudinal cross-sectional view showing the screwing completion state of the front shaft and the rear shaft of the second example. 図９の状態において、９０度回転させた方向から見た縦切断断面図である。FIG. 10 is a longitudinal sectional view as seen from a direction rotated 90 degrees in the state of FIG. 9. 図９の状態における、Ａ−Ａ断面図（横断面図）である。FIG. 10 is an AA cross-sectional view (transverse cross-sectional view) in the state of FIG. 9. 第３例の前軸の縦切断断面図である。It is a longitudinal cross-sectional view of the front shaft of the third example. 第３例の後軸の外観図である。It is an external view of the rear axis of the third example. 図１３の状態において、９０度回転させた方向から見た縦切断断面図である。It is the longitudinal cross-sectional view seen from the direction rotated 90 degree | times in the state of FIG. 第３例の前軸と後軸の螺合完了状態を表す縦切断断面図である。It is a longitudinal cross-sectional view showing the screwing completion state of the front shaft and the rear shaft of the third example. 図１５の状態において、９０度回転させた方向から見た縦切断断面図である。It is the longitudinal cross-sectional view seen from the direction rotated 90 degree | times in the state of FIG. 図１６における、係合部付近の部分拡大図である。It is the elements on larger scale near the engaging part in FIG. 図１５の状態における、Ｂ−Ｂ断面図（横断面図）である。FIG. 16 is a BB sectional view (transverse sectional view) in the state of FIG. 15. 第４例の前軸の縦切断断面図である。It is a longitudinal cross-sectional view of the front shaft of the fourth example. 第４例の前軸と後軸の螺合完了状態を表す縦切断断面図である。It is a longitudinal cross-sectional view showing the screwing completion state of the front shaft and the rear shaft of the fourth example. 図２０の状態において、９０度回転させた方向から見た縦切断断面図である。In the state of FIG. 20, it is the longitudinal cross-sectional view seen from the direction rotated 90 degree | times. 図２０の状態における、Ｃ−Ｃ断面図（横断面図）である。It is CC sectional drawing (transverse sectional view) in the state of FIG. 第５例の前軸の縦切断断面図である。It is a longitudinal cross-sectional view of the front shaft of the fifth example. 第５例の前軸と後軸の螺合完了状態を表す縦切断断面図である。It is a longitudinal cross-sectional view showing the screwing completion state of the front shaft and the rear shaft of the fifth example. 図２４の状態において、９０度回転させた方向から見た縦切断断面図である。It is the longitudinal cross-sectional view seen from the direction rotated 90 degree | times in the state of FIG. 図２４の状態における、Ｄ−Ｄ断面図（横断面図）である。It is DD sectional drawing (transverse sectional view) in the state of FIG.

図１〜図５に第１例を示し説明する。本例は、本発明を筆記具のシャープペンシルに展開した例である。本発明は、シャープペンシル以外にも、ボールペン、塗布具等の筆記具、また、化粧品の容器等に用いることができる。 A first example will be described with reference to FIGS. In this example, the present invention is developed on a mechanical pencil as a writing instrument. The present invention can be used for writing instruments such as ballpoint pens and applicators, cosmetic containers, and the like in addition to mechanical pencils.

軸筒１は、内部に芯保持部材２が圧入固定されている先部材３と、その先部材３の後端に着脱自在に螺着された前軸（第１の軸筒）４、その前軸４の後端に着脱不可能に螺着された後軸（第２の軸筒）５とから構成されており、軸筒１の内部には芯繰り出し手段６が配置されている。
前記前軸４は、前方に縮径部７が形成されており、この縮径部７の外周には、熱可塑性エラストマーやシリコーンなどからなるグリップ８が配置されている。本例においては、グリップ８は、前軸４に挿着されている。一方、前記後軸５は、その後方外周面にクリップ９が一体に設けられている。このクリップ９は、その全体が湾曲した形状となっており、その前方軸筒１側には、玉部１０が形成されている。 The shaft tube 1 includes a tip member 3 in which a core holding member 2 is press-fitted and fixed, a front shaft (first shaft tube) 4 detachably screwed to a rear end of the tip member 3, and a front thereof. A rear shaft (second shaft cylinder) 5 is screwed to the rear end of the shaft 4 so as not to be detachable. A core feeding means 6 is disposed inside the shaft cylinder 1.
The front shaft 4 has a reduced diameter portion 7 formed in the front, and a grip 8 made of a thermoplastic elastomer or silicone is disposed on the outer periphery of the reduced diameter portion 7. In this example, the grip 8 is inserted into the front shaft 4. On the other hand, the rear shaft 5 is integrally provided with a clip 9 on the rear outer peripheral surface thereof. The clip 9 has a curved shape as a whole, and a ball portion 10 is formed on the front shaft cylinder 1 side.

次に、前記芯繰り出し手段６について詳述する。本例の芯繰り出し手段６においては、芯Ｌを把持、開放するためのチャック体１１が軸筒１の前方に配置されており、そのチャック体１１にはチャック体１１の開閉を行うチャックリング１２が囲繞した状態で挿着されている。そして、チャック体１１の後方には芯Ｌを収容する芯タンク１３が圧入固定されている。その芯タンク１３の圧入固定部、すなわち、芯タンク１３の前方は、縮径部１４となっており、この縮径部１４により、芯タンク１３の外周面には段部１５が形成されている。一方、前軸４の前方内周面にも、段部１６が形成されている。前記芯タンク１３の段部１５と前記前軸４の段部１６の間には、芯繰り出し手段６を軸筒１後方へ付勢する弾撥部材（コイルスプリング）１７が帳架されている。 Next, the lead feeding means 6 will be described in detail. In the lead feeding means 6 of this example, a chuck body 11 for gripping and releasing the lead L is disposed in front of the shaft cylinder 1, and a chuck ring 12 for opening and closing the chuck body 11 is provided in the chuck body 11. Is inserted in a state of Go. A lead tank 13 that houses the lead L is press-fitted and fixed behind the chuck body 11. A press-fit fixing portion of the lead tank 13, that is, a front portion of the lead tank 13 is a reduced diameter portion 14, and a step portion 15 is formed on the outer peripheral surface of the lead tank 13 by the reduced diameter portion 14. . On the other hand, a step 16 is also formed on the front inner peripheral surface of the front shaft 4. Between the step portion 15 of the lead tank 13 and the step portion 16 of the front shaft 4, an elastic member (coil spring) 17 that urges the lead feeding means 6 toward the rear of the shaft cylinder 1 is mounted.

続いて、シャープペンシルの後方部について詳述する。前記芯タンク１３の後方内周面には、段部１８が形成されている。この芯タンク１３の後方には、消しゴム１９が挿入されているが、この消しゴム１９は、前記芯タンク１３の段部１８によって位置決めされている。
また、前記芯タンク１３の後方外周面には、鍔部２０と凹部２２が形成されている。その凹部２２は、鍔部２０より後方に位置している。そして、前記芯タンク１３の後方には、消しゴム１８を覆うように、押圧部材２１が嵌合されている。この押圧部材２１の内周面には、前記芯タンク１３の凹部２２と係合する凸部２３が形成されており、これにより、芯タンク１３と押圧部材２１が嵌合できるようになっている。さらに、押圧部材２１の後方には、熱可塑性エラストマーやシリコーンなどからなる押圧部材カバー２４が配置されており、また、押圧部材２１の天面には、貫通孔２５が形成されている。 Next, the rear part of the mechanical pencil will be described in detail. A step portion 18 is formed on the rear inner peripheral surface of the core tank 13. An eraser 19 is inserted behind the lead tank 13, and the eraser 19 is positioned by a step portion 18 of the lead tank 13.
A flange 20 and a recess 22 are formed on the rear outer peripheral surface of the core tank 13. The concave portion 22 is located behind the collar portion 20. A pressing member 21 is fitted behind the lead tank 13 so as to cover the eraser 18. On the inner peripheral surface of the pressing member 21, a convex portion 23 that engages with the concave portion 22 of the core tank 13 is formed, so that the core tank 13 and the pressing member 21 can be fitted. . Further, a pressing member cover 24 made of a thermoplastic elastomer or silicone is disposed behind the pressing member 21, and a through hole 25 is formed on the top surface of the pressing member 21.

シャープペンシルを使用する際は、前記押圧部材２１を軸筒１の前方に向けて押圧する。これにより、芯タンク１３、その芯タンク１３に圧入固定されているチャック体１１が前方に押圧され、前進する。このとき芯Ｌをも前進せしめ、チャックリング１２が先部材３の内周面に設けられた段部２６に当接し、チャック体１１が拡開する。そして、チャック体１１の拡開後も、チャック体１１の前進動作が行われる。ここで押圧部材２１の押圧操作を解除すると、芯タンク１３とチャック体１１が後退し、チャック体１１がチャックリング１２によって閉鎖せしめられ、再び芯Ｌを把持する。これで芯Ｌの繰り出し動作が完了する。 When using a mechanical pencil, the pressing member 21 is pressed toward the front of the shaft tube 1. As a result, the lead tank 13 and the chuck body 11 press-fitted and fixed to the lead tank 13 are pressed forward to move forward. At this time, the lead L is also moved forward, the chuck ring 12 comes into contact with the step portion 26 provided on the inner peripheral surface of the tip member 3, and the chuck body 11 is expanded. And even after the chuck body 11 is expanded, the forward movement of the chuck body 11 is performed. When the pressing operation of the pressing member 21 is released here, the lead tank 13 and the chuck body 11 are retracted, the chuck body 11 is closed by the chuck ring 12, and the lead L is gripped again. This completes the lead L feeding operation.

前記前軸４と前記後軸５の構成、および、その連結について詳述する。
図３は、前軸４後方の縦断面拡大図である。前軸４の後方内周面には、雌螺子部２７が形成されている。この雌螺子部２７より前方には内径が拡径している拡径部２８が設けられており、この拡径部２８により段部（係合部）２９が形成されている。この段部２９は、前軸４の内周面に対して垂直、すなわち、前軸４と後軸５の連結方向に対して垂直に形成されている。なお、以下では、この前軸４と後軸５との連結方向、すなわち、前軸４に後軸５を挿入させた際の方向のことを、「連結方向」または「軸筒の連結方向」と記載する。
一方、図４は、後軸５の外観拡大図である。後軸５の中央部外周面には、雄螺子部３０が形成されており、後軸５は、前軸４と螺着可能となっている。そして、雄螺子部３０より前方の後軸５外周面には、前記前軸４の段部２９と係止可能な凸部（係合部）３１が、ほぼ全周に形成されている。この凸部３１は、全体が矢型形状となっており、後軸５の外周面と垂直な面部３２と、その垂直な面部３２より前方に位置し、軸心方向すなわち後軸５の径中心方向に向かって傾斜している傾斜面部３３とを有している。この面部３２は、軸筒の連結方向に対して垂直に形成されており、前記前軸４の段部２９と係合する。また、前記後軸５の前方外周面には、対向する位置にスリット３４が２箇所形成されており、その前端は開口している。 The configuration of the front shaft 4 and the rear shaft 5 and the connection thereof will be described in detail.
FIG. 3 is an enlarged longitudinal sectional view of the rear side of the front shaft 4. A female screw portion 27 is formed on the rear inner peripheral surface of the front shaft 4. In front of the female screw portion 27, an enlarged diameter portion 28 having an enlarged inner diameter is provided, and a step portion (engagement portion) 29 is formed by the enlarged diameter portion 28. The step portion 29 is formed perpendicular to the inner peripheral surface of the front shaft 4, that is, perpendicular to the connecting direction of the front shaft 4 and the rear shaft 5. In the following, the connecting direction between the front shaft 4 and the rear shaft 5, that is, the direction when the rear shaft 5 is inserted into the front shaft 4, is referred to as "connecting direction" or "shaft tube connecting direction". It describes.
On the other hand, FIG. 4 is an enlarged external view of the rear shaft 5. A male screw portion 30 is formed on the outer peripheral surface of the central portion of the rear shaft 5, and the rear shaft 5 can be screwed to the front shaft 4. A convex portion (engagement portion) 31 that can be engaged with the step portion 29 of the front shaft 4 is formed on substantially the entire circumference on the outer peripheral surface of the rear shaft 5 in front of the male screw portion 30. The convex portion 31 has an arrow shape as a whole, and is positioned in front of the surface portion 32 perpendicular to the outer peripheral surface of the rear shaft 5 and the vertical surface portion 32, and is in the axial direction, that is, the radial center of the rear shaft 5. And an inclined surface portion 33 inclined toward the direction. The surface portion 32 is formed perpendicular to the connecting direction of the shaft tube and engages with the step portion 29 of the front shaft 4. Further, two slits 34 are formed on the front outer peripheral surface of the rear shaft 5 at opposing positions, and the front end thereof is open.

次に作用について説明する。前記前軸４に前記後軸５を螺合する際、後軸５にはスリット３４が形成されているため、前記凸部３１が形成されている箇所が内方にたわみながら前軸４の内部を前進していく。前記スリット３４により、後軸５の前方部は、弾性変形可能になっているのである。そして、前軸４と後軸５との螺合が完了すると、スリット３４が拡開して前軸４の段部２９と後軸５の凸部３１が係合し、前軸４と後軸５との連結がなされる（図５）。
この状態で、後軸５を外すように軸筒の連結方向と逆の方向に引っ張る力が加わった場合、または、螺合解除回転方向（軸筒の周方向）に力が加わった場合のいずれの場合においても、軸筒の連結方向に対して垂直に形成されている前記前軸４の段部２９の面部と後軸５の凸部３１の垂直な面部３２とが当接して、軸筒の連結方向とは逆の方向への抵抗を生じさせる。これにより、前軸４と後軸５との離脱方向に力が働いても、後軸５が前軸４から抜けることがなく、また、螺合解除回転方向に力が働いても、螺合が解除される事がなく、確実に前軸４と後軸５が固定される。螺合による連結だけでは、螺子を無理抜きによって形成した場合、雌螺子部と雄螺子部の接触力が十分に得られずに抜けてしまう可能性や、小さな部品の場合、螺子の噛む山（螺子山）の数が不十分なことが考えられるが、この後軸５の凸部３１の抵抗力により、後軸５を前軸４から抜こうとする力への抵抗力を補う事が出来、確実に前軸４と後軸５を固定することが出来るのである。 Next, the operation will be described. When the rear shaft 5 is screwed to the front shaft 4, the rear shaft 5 is formed with a slit 34, so that the portion where the convex portion 31 is formed is inwardly bent while being bent inward. Go forward. The slit 34 allows the front portion of the rear shaft 5 to be elastically deformed. When the front shaft 4 and the rear shaft 5 are screwed together, the slit 34 is expanded, and the step portion 29 of the front shaft 4 and the convex portion 31 of the rear shaft 5 are engaged, and the front shaft 4 and the rear shaft are engaged. 5 is connected (FIG. 5).
In this state, either when a pulling force is applied in the direction opposite to the connecting direction of the shaft tube so as to remove the rear shaft 5, or when a force is applied in the screwing release rotation direction (circumferential direction of the shaft tube) In this case, the surface portion of the step portion 29 of the front shaft 4 formed perpendicular to the connecting direction of the shaft tube and the vertical surface portion 32 of the convex portion 31 of the rear shaft 5 come into contact with each other. This causes resistance in the direction opposite to the connecting direction. As a result, even if a force acts in the direction in which the front shaft 4 and the rear shaft 5 are detached, the rear shaft 5 does not come out of the front shaft 4, and even if a force acts in the screwing release rotational direction, Is not released, and the front shaft 4 and the rear shaft 5 are securely fixed. If the screw is formed by forcibly removing only by screwing, the contact force between the female screw part and the male screw part may not be obtained sufficiently, and in the case of small parts, It is conceivable that the number of screw threads) is insufficient, but the resistance force of the convex portion 31 of the rear shaft 5 can compensate for the resistance force to the force to pull the rear shaft 5 from the front shaft 4. The front shaft 4 and the rear shaft 5 can be securely fixed.

なお、本例においては、スリット３４を形成したので、凸部３１の寸法のバラツキを吸収し、組立易く、確実に段部２９と凸部３１を係合することが出来る。さらに、本例においては、図２に示すように、前軸４と後軸５を螺合した後、後軸５の内部に芯タンク１３が挿入されているため、螺合完了後のスリット３４の内方への変形を防止し、万が一にも凸部３１と段部２９との係合が外れる事がない。 In this example, since the slits 34 are formed, variations in the dimensions of the convex portions 31 are absorbed, and the step portions 29 and the convex portions 31 can be reliably engaged with each other with ease of assembly. Further, in this example, as shown in FIG. 2, since the lead tank 13 is inserted into the rear shaft 5 after the front shaft 4 and the rear shaft 5 are screwed together, the slit 34 after the screwing is completed. Inward deformation of the projection 31 and the stepped portion 29 will not be disengaged.

次に図６〜図１１に第２例を示し説明する。本例は、前記係合部が螺合解除回転方向すなわち軸筒の周方向でも当接するように、係合部を形成した例である。以下では、第１例と同様の構成に関する記載は割愛する。 Next, a second example will be described with reference to FIGS. This example is an example in which the engaging portion is formed so that the engaging portion also contacts in the screwing release rotation direction, that is, the circumferential direction of the shaft tube. Below, the description regarding the structure similar to a 1st example is omitted.

前軸４の雌螺子部２７の前端部には、その雌螺子部２７にかかるようにして凸部３５が形成されている。この凸部３５は、対向する位置に２箇所形成されており、図１１に示すように、横断面が三角形状で、螺合回転進行方向に向かって徐々に高くなる緩やかな傾斜面部３６と前軸４の内周面と略直交する急な傾斜面部３７とを有している。この凸部３５の軸筒の連結方向側の面部３８は、前軸４の内周面に対して垂直な面部すなわち軸筒の連結方向に対して垂直な面部となっている。
一方、後軸５には、雄螺子部３０の前方から後方にかけて窓孔部（凹部）３９を形成している。この窓孔部（凹部）３９も、対向する位置に２箇所形成されており、前記凸部３５と係合するようになっている。 A convex portion 35 is formed on the front end portion of the female screw portion 27 of the front shaft 4 so as to be engaged with the female screw portion 27. As shown in FIG. 11, the convex portions 35 are formed at two positions opposite to each other. As shown in FIG. 11, the convex portion 35 has a triangular cross section and a gradually inclined surface portion 36 that gradually increases in the direction of screw rotation. A steep inclined surface portion 37 that is substantially orthogonal to the inner peripheral surface of the shaft 4 is provided. The surface portion 38 of the convex portion 35 on the connecting direction side of the shaft tube is a surface portion perpendicular to the inner peripheral surface of the front shaft 4, that is, a surface portion perpendicular to the connecting direction of the shaft tube.
On the other hand, a window hole portion (concave portion) 39 is formed on the rear shaft 5 from the front to the rear of the male screw portion 30. Two window hole portions (concave portions) 39 are also formed at opposite positions so as to engage with the convex portions 35.

次に作用について説明する。前述したように、前軸４の凸部３５は、螺合回転進行方向に向かって徐々に高くなる緩やかな傾斜面部３６を有していることから、前軸４に後軸５を螺合する際、その螺合進行方向に前軸４の凸部３５が倒れるように変形する。そして、螺合が完了すると、前軸４の凸部３５が後軸５の窓孔部３９に入り込み、凸部３５と窓孔部３９の係合がなされる。
ここで、前軸４と後軸５とを離脱させる方向（軸筒の連結方向とは逆の方向）に力が働くと、前軸４の雌螺子部２７と後軸５の雄螺子部３０が当接し、また同時に、連結方向に対して垂直に形成された２つの面部、すなわち、前記凸部３５の軸筒の連結方向側の面部３８と後軸５の窓孔部３９の前端面４０とが当接する。これにより、軸筒の連結方向と逆の方向へ前軸４と後軸５とを抜こうとする力に対して抵抗力が働き、前軸４からの後軸５の抜けを確実に防ぐ事が出来る。
また、本例においても、螺合解除回転方向に力が加わった場合にも、前軸４の凸部３５における軸筒の連結方向側の面部３８と後軸５の窓孔部３９の前端面４０が当接し、螺合が解除されないようになっている。そして、本例においては、さらに、前軸４の凸部３５の螺合解除回転方向の側面、すなわち、前記急な傾斜面部３７が、対応する後軸５の窓孔部３９の内側面４１と当接する。このため、螺合解除回転方向（軸筒の周方向）にも凸部３５と窓孔部３９が当接することによる抵抗力が働き、螺合が解除される事がないようになっている。これにより、前軸４と後軸５の固定を更に確実にすることが出来る。 Next, the operation will be described. As described above, since the convex portion 35 of the front shaft 4 has the gently inclined surface portion 36 that gradually increases in the screwing rotation traveling direction, the rear shaft 5 is screwed to the front shaft 4. At this time, the convex portion 35 of the front shaft 4 is deformed so as to fall in the screwing direction. When the screwing is completed, the convex portion 35 of the front shaft 4 enters the window hole portion 39 of the rear shaft 5, and the convex portion 35 and the window hole portion 39 are engaged.
Here, when a force acts in a direction in which the front shaft 4 and the rear shaft 5 are separated (a direction opposite to the connecting direction of the shaft tube), the female screw portion 27 of the front shaft 4 and the male screw portion 30 of the rear shaft 5. At the same time, and at the same time, two surface portions formed perpendicular to the connecting direction, that is, the surface portion 38 of the convex portion 35 on the connecting direction side of the shaft tube and the front end surface 40 of the window hole portion 39 of the rear shaft 5. And abut. As a result, a resistance force acts against the force to pull out the front shaft 4 and the rear shaft 5 in the direction opposite to the connecting direction of the shaft cylinder, and the rear shaft 5 is prevented from coming off from the front shaft 4 with certainty. I can do it.
Also in this example, even when a force is applied in the screwing release rotation direction, the front end surface of the surface portion 38 on the coupling direction side of the shaft tube and the window hole portion 39 of the rear shaft 5 in the convex portion 35 of the front shaft 4. 40 is abutted so that screwing is not released. In this example, the side surface in the screwing release rotation direction of the convex portion 35 of the front shaft 4, that is, the steep inclined surface portion 37 is connected to the inner side surface 41 of the corresponding window hole portion 39 of the rear shaft 5. Abut. For this reason, a resistance force due to the contact between the convex portion 35 and the window hole portion 39 also works in the screwing release rotation direction (circumferential direction of the shaft tube), so that the screwing is not released. Thereby, the front shaft 4 and the rear shaft 5 can be more securely fixed.

本例においては、雌螺子部２７を形成した前軸４に凸部３５、雄螺子部３０を形成した後軸５に窓孔部３９を形成したが、本例のように四方が閉じている窓孔部３９に凸部３５を係合させた場合には、螺合を無理やり解除しようとしたり、軸筒の連結方向と逆の方向に強く抜こうとしたりしても、窓孔部が変形しにくく、また、螺合解除回転方向（軸筒の周方向）に力を受けても、窓孔部がその拡開方向に力を受けるため、後軸の外径も拡開する方向に変形し、前軸との結合状態がより強固になり外れにくいといった良さがある。また、四方が囲まれた部分に凸部が係合されるので、上述したように、軸筒の連結方向と逆の方向に対する抜けだけでなく、螺合解除回転方向の力にも係止する力が働き、確実に前軸と後軸とを固定することが出来る。 In this example, the convex portion 35 is formed on the front shaft 4 on which the female screw portion 27 is formed, and the window hole portion 39 is formed on the rear shaft 5 on which the male screw portion 30 is formed, but the four sides are closed as in this example. When the convex portion 35 is engaged with the window hole portion 39, the window hole portion is deformed even if the screwing is forcibly canceled or the shaft tube is strongly pulled in the direction opposite to the connecting direction of the shaft tube. In addition, even if a force is received in the screw release rotation direction (circumferential direction of the shaft tube), the window hole portion receives a force in the expanding direction, so that the outer diameter of the rear shaft is also deformed to expand. However, there is an advantage that the coupling state with the front shaft becomes stronger and difficult to come off. Further, since the convex portion is engaged with the portion surrounded by the four sides, as described above, not only the shaft cylinder is pulled out in the direction opposite to the connecting direction but also locked in the force in the screwing release rotation direction. The force works and the front shaft and the rear shaft can be securely fixed.

また、本例においては、雌螺子部を形成した前軸に凸部、雄螺子部を形成した後軸に窓孔部（凹部）を形成したが、雌螺子部を形成した前軸に凹部、雄螺子部を形成した後軸に凸部を形成してもよい。その場合にも、本例と同じ効果が得られる。
本例においては、凸部と凹部を２対形成したが、その数は適宜選択することができる。 Further, in this example, a convex portion is formed on the front shaft on which the female screw portion is formed, and a window hole portion (concave portion) is formed on the rear shaft on which the male screw portion is formed, but a concave portion is formed on the front shaft on which the female screw portion is formed, You may form a convex part in the back axis | shaft which formed the external thread part. In that case, the same effect as this example can be obtained.
In this example, two pairs of convex portions and concave portions are formed, but the number thereof can be selected as appropriate.

なお、本例においては、前軸４に形成した凸部３５を、雌螺子部２７の前端部に、その雌螺子部にかかるようにして形成したが、第４例などに示すように、雌螺子部の前端部近傍に凸部を形成しても良い。また、凸部は、第１例に示したように、雌螺子部より前方に形成しても良い。しかしながら、螺子部の前端部近傍に凸部を形成した場合には、成形時の無理抜きによる凸部の変形を小さくすることができるので、確実に凸部と窓孔部とを係合させることができる。また、螺合部と係合部とを離して形成した場合と比較して、螺合部と係合部におけるばらつきを吸収して確実に係合することができるので、螺合による固定力と係合部による固定力を最大限生かす事が出来る。 In this example, the convex portion 35 formed on the front shaft 4 is formed on the front end portion of the female screw portion 27 so as to cover the female screw portion. However, as shown in the fourth example, A convex portion may be formed in the vicinity of the front end portion of the screw portion. Further, as shown in the first example, the convex portion may be formed in front of the female screw portion. However, when the convex portion is formed in the vicinity of the front end portion of the screw portion, deformation of the convex portion due to forced removal at the time of molding can be reduced, so that the convex portion and the window hole portion are securely engaged. Can do. In addition, as compared with the case where the screwing portion and the engaging portion are formed apart from each other, the variation in the screwing portion and the engaging portion can be absorbed and reliably engaged. The fixing force by the engaging part can be utilized to the maximum.

次に図１２〜図１８に第３例を示し説明する。本例は、凸部と窓孔部の軸筒の連結方向での当接の仕方を鍵型状にした第２例の変形例である。 Next, a third example will be described with reference to FIGS. This example is a modification of the second example in which the method of abutment of the convex portion and the window hole portion in the connecting direction of the shaft tube is formed into a key shape.

前軸４の雌螺子部２７の前端部近傍には、凸部４２が形成されている。この凸部４２の縦断面形状は、矢型状をしており、軸筒の連結方向に対して凹状部４３を有している（図１７）。そして、この凸部４２の横断面は、図１８に示すように、四角形状である。
一方、後軸５には、雄螺子部３０の前方から後方にかけて窓孔部（凹部）４４を形成している。この窓孔部（凹部）４４の前端部の縦断面形状は、前記凹状部４３と係合する凸状部４５を有している。 A convex portion 42 is formed in the vicinity of the front end portion of the female screw portion 27 of the front shaft 4. The vertical cross-sectional shape of the convex portion 42 is arrow-shaped, and has a concave portion 43 with respect to the connecting direction of the shaft tube (FIG. 17). And the cross section of this convex part 42 is square shape, as shown in FIG.
On the other hand, a window hole portion (concave portion) 44 is formed in the rear shaft 5 from the front to the rear of the male screw portion 30. The vertical cross-sectional shape of the front end portion of the window hole portion (recessed portion) 44 has a convex portion 45 that engages with the concave portion 43.

次に作用について説明する。前軸４と後軸５の螺合を完了させると、前軸４の凸部４２と後軸５の窓孔部４４とが係合する。このとき、この係合部は、前記凸部４２の凹状部４３が前記窓孔部４４の凸状部４５を覆うように係合するため、後軸５を前軸４との離脱方向すなわち軸筒の連結方向と逆の方向に力が加わった場合においても、より確実に前軸４と後軸５との固定を行うことが出来る。
なお、本例の場合も、前軸４の凸部４２と窓孔部４４とが軸筒の周方向においても当接する。このため、螺合解除回転方向（軸筒の周方向）に力が加わっても、軸筒の連結方向と逆の方向および螺合解除回転方向に対する抵抗力が生じる。よって、いずれの場合においても、螺合が解除されることも、後軸５が前軸４から抜けてしまうこともなく、前軸４と後軸５の固定を確実に行うことが出来る。 Next, the operation will be described. When the screwing of the front shaft 4 and the rear shaft 5 is completed, the convex portion 42 of the front shaft 4 and the window hole portion 44 of the rear shaft 5 are engaged. At this time, the engaging portion engages so that the concave portion 43 of the convex portion 42 covers the convex portion 45 of the window hole portion 44, so that the rear shaft 5 is detached from the front shaft 4, that is, the shaft Even when a force is applied in the direction opposite to the connecting direction of the cylinders, the front shaft 4 and the rear shaft 5 can be more reliably fixed.
In the case of this example as well, the convex portion 42 of the front shaft 4 and the window hole portion 44 abut on each other in the circumferential direction of the shaft tube. For this reason, even if a force is applied in the screw release rotation direction (circumferential direction of the shaft tube), a resistance force is generated in the direction opposite to the connecting direction of the shaft tube and the screw release release rotation direction. Therefore, in any case, the front shaft 4 and the rear shaft 5 can be securely fixed without being unscrewed and without the rear shaft 5 being detached from the front shaft 4.

次に、図１９〜図２２に第４例を示し説明する。本例は、前軸４の凸部を複数連なるように形成した、第２例の変形例である。
前軸４の雌螺子部２７の前端部近傍には、凸部４６を複数形成している。この凸部４６は、横断面が三角形状であり、螺合回転進行方向に向かって徐々に高くなる緩やかな傾斜面部４７と、前軸４の内周面と略直交する急な傾斜面部４８とを有している。この凸部４６の軸筒の連結方向側の面部４９は、前軸４の内周面に対して垂直な面部、すなわち軸筒の連結方向に対して垂直な面部となっている。 Next, a fourth example will be described with reference to FIGS. This example is a modification of the second example in which a plurality of convex portions of the front shaft 4 are formed in series.
A plurality of convex portions 46 are formed near the front end portion of the female screw portion 27 of the front shaft 4. The convex portion 46 has a triangular cross section, a gently inclined surface portion 47 that gradually increases in the direction of threading rotation, and a steep inclined surface portion 48 that is substantially orthogonal to the inner peripheral surface of the front shaft 4. have. The surface portion 49 of the convex portion 46 on the connecting direction side of the shaft tube is a surface portion perpendicular to the inner peripheral surface of the front shaft 4, that is, a surface portion perpendicular to the connecting direction of the shaft tube.

次に作用について説明する。前軸４と後軸５の螺合を完了させると、前軸４の凸部４６と後軸５の窓孔部３９とが係合する。このとき、螺合での組み付けの為、その螺合完了位置にばらつきがあったとしても、図１９の凸部４６のように複数で連続に設ける事で、そのばらつきを許容する事が出来るのである。
結果、本例においても、前軸４と後軸５を離す方向すなわち軸筒の連結方向と逆の方向に力が加わった際には、雌螺子部２７と雄螺子部３０の他に、前軸４の凸部４６の面部４９と窓孔部３９の面部４０が当接し、軸筒の連結方向と逆の方向への抵抗力を発生させる。また、本例の場合も、前軸４の凸部４６と窓孔部３９とが軸筒の周方向においても当接する。このため、螺合解除回転方向（軸筒の周方向）に力が加わっても、軸筒の連結方向と逆の方向および螺合解除回転方向に対する抵抗力が生じる。よって、いずれの場合においても、螺合が解除されることも、後軸５が前軸４から抜けてしまうこともなく、前軸４と後軸５の固定を確実に行うことが出来る。 Next, the operation will be described. When the screwing of the front shaft 4 and the rear shaft 5 is completed, the convex portion 46 of the front shaft 4 and the window hole 39 of the rear shaft 5 are engaged. At this time, because of the assembly by screwing, even if there is a variation in the screwing completion position, such a variation can be allowed by providing a plurality of continuous portions as in the convex portion 46 of FIG. is there.
As a result, also in this example, when a force is applied in the direction separating the front shaft 4 and the rear shaft 5, that is, the direction opposite to the connecting direction of the shaft tube, in addition to the female screw portion 27 and the male screw portion 30, The surface portion 49 of the convex portion 46 of the shaft 4 and the surface portion 40 of the window hole portion 39 come into contact with each other to generate a resistance force in a direction opposite to the connecting direction of the shaft tube. Also in the case of this example, the convex portion 46 of the front shaft 4 and the window hole portion 39 also abut on each other in the circumferential direction of the shaft tube. For this reason, even if a force is applied in the screw release rotation direction (circumferential direction of the shaft tube), a resistance force is generated in the direction opposite to the connecting direction of the shaft tube and the screw release release rotation direction. Therefore, in any case, the front shaft 4 and the rear shaft 5 can be securely fixed without being unscrewed and without the rear shaft 5 being detached from the front shaft 4.

最後に図２３〜図２６に第５例を示し説明する。本例においても、前軸４の雌螺子部２７の前端部近傍に、凸部５０を形成している。前軸４には、この凸部５０の前方部を残し、周囲三方向に食い切りを入れることにより、弾性片部５１が形成されている。このように食い切ることにより、前記凸部５０を有する弾性片部５１は、前軸４の軸筒の外径方向（軸径外方向）に動くようになっている。この凸部５０の軸筒の連結方向側の面部５２は、前軸４の内周面に対して垂直な面部、すなわち、軸筒の連結方向に対して垂直な面部として形成されている。
そして、後軸５には、第２例ないし第４例と同様に、雄螺子部３０の前端部から後端部にかけて窓孔部（凹部）３９が形成されている。 Finally, a fifth example will be described with reference to FIGS. Also in this example, the convex portion 50 is formed in the vicinity of the front end portion of the female screw portion 27 of the front shaft 4. An elastic piece 51 is formed on the front shaft 4 by leaving a front portion of the convex portion 50 and cutting out in three directions. By cutting out in this way, the elastic piece portion 51 having the convex portion 50 is adapted to move in the outer diameter direction of the front shaft 4 (outer shaft diameter direction). The surface portion 52 of the convex portion 50 on the connecting direction side of the shaft tube is formed as a surface portion perpendicular to the inner peripheral surface of the front shaft 4, that is, a surface portion perpendicular to the connecting direction of the shaft tube.
The rear shaft 5 has a window hole (concave portion) 39 formed from the front end portion to the rear end portion of the male screw portion 30 as in the second to fourth examples.

次に作用について説明する。前軸４と後軸５を螺合させていくと、凸部５０が前軸４の軸径外方向に動くため、凸部５０が前軸４の外側へと押し出されるように弾性片部５１が弾性変形して、螺合が進行する。弾性片部５１によって前軸４の凸部５０の弾性変形量を多くして、雄螺子部３０が形成されている後軸５を傷つけにくくしているのである。そして、螺合が完了すると、前軸４の凸部５０が前軸４の内方へ動いて、後軸５の窓孔部３９に入り込み、前軸４の凸部５０と後軸５の窓孔部３９との係合も完了する。
そして、本例においても、前軸４と後軸５との離脱方向に力が加わった際には、雌螺子部２７と雄螺子部３０が当接する他に、前軸４の凸部５０と後軸５の窓孔部３９が当接し、軸筒の連結方向と逆の方向の力に対する抵抗力を発生させる。また、螺合解除回転方向すなわち軸筒の周方向に力が加わっても、前軸４の凸部５０と後軸５の窓孔部３９とが当接し、螺合解除回転方向への抵抗力を発生させる。このため、前軸４と後軸５の離脱方向に力が加わった場合、また、螺合解除回転方向に力が加わった場合のいずれにおいても、軸筒の連結方向と逆の方向への力に対する抵抗力と螺合解除回転方向の力に対する抵抗力が生じる。このため、いずれの場合においても、螺合が解除されることも、前軸５が前軸４から抜けてしまうこともなく、前軸４と前軸５の固定を確実に行うことが出来る。 Next, the operation will be described. When the front shaft 4 and the rear shaft 5 are screwed together, the convex portion 50 moves outward in the axial diameter of the front shaft 4, so that the elastic piece portion 51 is pushed out so that the convex portion 50 is pushed out of the front shaft 4. Is elastically deformed, and screwing proceeds. The elastic piece portion 51 increases the amount of elastic deformation of the convex portion 50 of the front shaft 4 to make it difficult to damage the rear shaft 5 on which the male screw portion 30 is formed. When the screwing is completed, the convex portion 50 of the front shaft 4 moves inward of the front shaft 4 and enters the window hole portion 39 of the rear shaft 5, and the convex portion 50 of the front shaft 4 and the window of the rear shaft 5 are moved. Engagement with the hole 39 is also completed.
Also in this example, when a force is applied in the direction in which the front shaft 4 and the rear shaft 5 are separated, the female screw portion 27 and the male screw portion 30 abut on each other, and the convex portion 50 of the front shaft 4 The window hole 39 of the rear shaft 5 abuts and generates a resistance force against the force in the direction opposite to the connecting direction of the shaft tube. Further, even if a force is applied in the screwing rotation direction, that is, in the circumferential direction of the shaft cylinder, the convex portion 50 of the front shaft 4 and the window hole 39 of the rear shaft 5 come into contact with each other, and the resistance force in the screwing rotation direction Is generated. For this reason, when a force is applied in the direction in which the front shaft 4 and the rear shaft 5 are disengaged or a force is applied in the screwing release rotation direction, the force in the direction opposite to the connecting direction of the shaft tube And a resistance force against the force in the screw release rotation direction are generated. For this reason, in any case, the front shaft 4 and the front shaft 5 can be reliably fixed without being unscrewed and without the front shaft 5 being removed from the front shaft 4.

なお、本例のように、凸部５０の前方部を残した状態で、周囲三方向に食い切りを入れることで弾性片部５１を設けた場合、その弾性片部５１は、前記凸部５０の前方部を支点として軸径方向に動く。凸部５０と窓孔部３９との係合後、螺合解除回転方向に前軸４を回転させると、凸部５０とその凸部５０を有する弾性片部５１は食い切りの上方、すなわち、前軸４の後方に向けて変形するが、やがて前軸４の内壁に接触して変形が止まる。このとき、前軸４の凸部５０と後軸５の窓孔部３９とに形成された連結方向に対して垂直な面部が面接触し、軸径外方向へは変形しない。そのため、凸部５０の窓孔部３９との係合は外れることがない。凸部５０の側方部のうち１箇所を残した状態で、他方の側方部および前方部、後方部の周囲三方向に食い切りを入れることによって、凸部５０を軸径方向に変形可能とした場合と比較すると、本例は、凸部と窓孔部とが一度係合した後は、凸部が軸径方向に動くことがないため、確実に凸部と窓孔部との係合状態を維持することが出来る。 In the case where the elastic piece 51 is provided by cutting out in the three surrounding directions with the front portion of the convex portion 50 left as in this example, the elastic piece portion 51 is It moves in the axial direction using the front part as a fulcrum. When the front shaft 4 is rotated in the screwing release direction after the engagement between the projection 50 and the window hole 39, the projection 50 and the elastic piece 51 having the projection 50 are above the bite, that is, the front Although it deform | transforms toward the back of the axis | shaft 4, it will contact the inner wall of the front axis | shaft 4 eventually, and a deformation | transformation will stop. At this time, the surface portion perpendicular to the connecting direction formed in the convex portion 50 of the front shaft 4 and the window hole portion 39 of the rear shaft 5 is in surface contact and is not deformed outward in the shaft radial direction. For this reason, the engagement of the convex portion 50 with the window hole 39 is not released. With one portion left out of the side portions of the convex portion 50, the convex portion 50 can be deformed in the axial radial direction by cutting out in the three directions around the other side portion, the front portion, and the rear portion. Compared with the case where the convex portion and the window hole portion are engaged once, the convex portion does not move in the axial radial direction after the convex portion and the window hole portion are once engaged. The state can be maintained.

１軸筒
２芯保持部材
３先部材
４前軸（第１の軸筒）
５後軸（第２の軸筒）
６芯繰り出し手段
７チャック体
８チャックリング
９芯タンク
１０玉部
１１チャック体
１２チャックリング
１３芯タンク
１４縮径部
１５段部
１６段部
１７弾撥部材
１８段部
１９消しゴム
２０鍔部
２１押圧部材
２２凹部
２３凸部
２４押圧部材カバー
２５貫通孔
２６段部
２７雌螺子部
２８拡径部
２９段部（係合部）
３０雄螺子部
３１凸部（係合部）
３２面部
３３傾斜面部
３４スリット
３５凸部（係合部）
３６傾斜面部
３７傾斜面部
３８面部
３９窓孔部（係合部）
４０前端面
４１内側面
４２凸部（係合部）
４３凹状部（係合部）
４４窓孔部
４５凸状部（係合部）
４６凸部（係合部）
４７傾斜面部
４８傾斜面部
４９面部
５０凸部（係合部）
５１弾性片部
５２面部
1 shaft cylinder 2 core holding member 3 tip member 4 front shaft (first shaft cylinder)
5 Rear shaft (second barrel)
6 core feeding means 7 chuck body 8 chuck ring 9 core tank 10 ball portion 11 chuck body 12 chuck ring 13 core tank 14 reduced diameter portion 15 step portion 16 step portion 17 repellent member 18 step portion 19 eraser 20 flange portion 21 pressing member 22 concave portion 23 convex portion 24 pressing member cover 25 through hole 26 step portion 27 female screw portion 28 enlarged diameter portion 29 step portion (engagement portion)
30 Male screw part 31 Convex part (engagement part)
32 surface part 33 inclined surface part 34 slit 35 convex part (engagement part)
36 inclined surface portion 37 inclined surface portion 38 surface portion 39 window hole portion (engagement portion)
40 Front end face 41 Inner side face 42 Convex part (engagement part)
43 Concave part (engagement part)
44 Window hole 45 Convex part (engagement part)
46 Convex part (engagement part)
47 Inclined surface portion 48 Inclined surface portion 49 Surface portion 50 Convex portion (engaging portion)
51 elastic piece 52 face part

Claims

The shaft cylinder is formed by connecting the first shaft cylinder and the second shaft cylinder by screwing, and an engaging portion that engages with the convex portion and the concave portion when the screwing is completed is provided in each shaft cylinder , The concave portion is used as a window hole portion, and a surface portion perpendicular to the connecting direction is formed on the engaging side of the engaging portion, and the engaging portion is also applied in the circumferential direction of the shaft tube. A shaft cylinder that is in contact with each other.

The shaft cylinder according to claim 1, wherein either one of the engaging portions is elastically deformable.

The shaft cylinder is formed by connecting the first shaft cylinder and the second shaft cylinder by screwing, and an engaging portion that engages with the convex portion and the concave portion when the screwing is completed is provided in each shaft cylinder, The concave portion is a window hole portion, and the vertical cross-sectional shape of the engagement surface of the convex portion with the concave portion is a shape having a concave portion with respect to the connection direction, and the relationship with the convex portion in the concave portion. A shaft cylinder characterized in that a longitudinal cross-sectional shape of a mating surface has a shape having a convex part that engages with the concave part, and the engaging part abuts also in a circumferential direction of the shaft cylinder.

The shaft cylinder according to claim 3, wherein any one of the engagement portions is elastically deformable.