1248786 A7 __B7_ 五、發明説明（彳） 【發明所屬的技術領域】 本發明是關於連結複數的竿體而成的釣竿，特別是關 於，將主竿與連結於其前側的主上竿以抽出形式連結，藉 由調整其位置關係而可調整釣竿全體的長度的釣竿。 【習知技術】 傳統的抽出形式的釣竿，複數的筒狀的釣竿體是可從 前側的釣竿體開始依序插入到竿根側的釣竿體內。在進行 釣魚時則將各釣竿體依序抽出至前側嵌合固定成爲一支釣 竿體來使用。另一方面，在要收容時則依序將前側的釣竿 體收容至竿根側的釣竿體內而成爲小型化的狀態。 在傳統的抽出形式的釣竿，是在主上竿與主竿調整其 位置關係，有用某種方式來使竿體全體的長度變化來釣魚 。以這種方式處理的釣竿的主竿，是在前側端部內周面具 有第一嵌合母部，在竿根側端部內周面具有第二嵌合母部 ，該第一嵌合母部或第二嵌合母部會在主上竿的竿根側端 部及前側的周面分別嵌合。在主上竿被抽出至前側的狀態（ 以下稱作「延伸狀態」），主上竿的嵌合公部是與主竿的第 一嵌合母部嵌合，而在主上竿插入於主竿內的狀態（以下稱 作「收容狀態」），主上竿的嵌合公部是與主竿的第二嵌合 母部嵌合。 這樣一來，主竿與主上竿不管是在「延伸狀態」或「 收容狀態」都可以互相嵌合固定，可因應狀況來變更竿全 體的長度來進行釣魚。 本紙張尺度適用中.國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本貫) -訂 經濟部智慧財產局員工消費合作社印製 -5- 經濟部智慧財產局員工消費合作社印製 1248786 A7 _ B7____ 五、發明説明（2 ) 【發明欲解決的課題】 這種抽出形式的釣竿，或者是抽出形式且可藉由主竿 與主上竿的相互關係來調節釣竿全體的長度的形式的釣竿 ，爲了提昇相互的嵌合力，而是把主竿的嵌合母部的內徑 與主上竿的外徑設定成精密地配合。因此，主竿會像活塞 的氣缸般地作用，有時將主上竿從主竿拉出或收容時的空 氣阻力會變得很大，而會妨礙主上竿對主竿的出入動作。 也就是說，主竿是位於最竿根側的大直徑的竿體，雖 也可以形成爲前端較細的筒狀體，而一般來說是單一錐度 或錐度變化很少的竿體。因此，如果把主竿的嵌合母部與 主上竿的嵌合公部的直徑設定得很精密地配合的話，在嵌 合部位以外的地方讓空氣通過的間隙（兩竿體的直徑差）會很 小，所以可能會產生如上述的.活塞化的現象。特別是，在 主上竿的前側的竿體，存在有實心的竿體或釣線卡止構件 時，這種情況特別明顯。 這種主竿與主上竿的活塞現象，會導致從安裝於主竿 的竿根側端部的底栓的間隙吸入水或灰塵等的情形，且在 主上竿出入時也會產生奇怪的聲音。 本發明的課題是要提供一種能夠順暢地讓主上竿出入 於主竿的釣竿。 【用以解決課題的手段】 第一發明的釣竿，是具備有：大直徑竿體、與以抽出 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公酱） I 1T------"" (請先閲讀背面之注意事項再填寫本頁) -6 - 經濟部智慧財產局員工消費合作社印製 1248786 A7 ___B7_ 五、發明説明（3 ) 形式可自由出入地被連結在大直徑竿體的前側的小直徑竿 體。大直徑竿體，是具有：從前側端部到竿根側其內周面 成爲嵌合母部的嵌合錐桿部分、連續於嵌合錐桿部分的竿 根側且越向竿根側直徑越大的第一錐桿部分、以及連續於 第一錐桿部分的竿根側且越向竿根側直徑越大而傾斜錐度 較第一錐桿部分更小的第二錐桿部分。而小直徑竿體，在 竿根側端部是具有直徑較其他部分更大且可嵌裝於嵌合錐 桿部分的內周面的嵌合公部。 大直徑竿體與小直徑竿體是以抽出形式連結，小直徑 竿體可出入自如於大直徑竿體內。在釣魚時，是將小直徑 竿體拉出到大直徑竿體的前側，再將小直徑竿體的嵌合公 部嵌裝固定到大直徑竿體的嵌合錐桿部分的內周面。而在 收容時，則解除該嵌裝來將小直徑竿體收容到大直徑竿體 內。 大直徑竿體是具有傾斜錐度部分地變得很大的第一錐 桿部分，該第一錐桿部分是讓大直徑竿體的嵌合錐桿部分 與第二錐桿部分的內徑的差異擴大化。藉此，讓大直徑竿 體的第二錐桿部分的內徑與小直徑竿體的外徑（特別是嵌合 公部的外徑）的差異變得很大，讓其間維持有足夠的餘隙。 該餘隙會抑制所謂的活塞化現象。藉由部分地設置第一錐 桿部分，也可防止大直徑的竿體全體的錐度不適當地變得 太大。 第二發明的釣竿，在第一發明的釣竿，其中大直徑竿 體的第二錐桿部分的前側端部的內徑、與小直徑竿體的嵌 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） n I I ϋ 111 — I — (請先閱讀背面之注意事項再填寫本頁) 1248786 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明説明（4 ) 合公部的外徑的差是設定爲0.5mm〜1·Omm左右 〇 在這種釣竿，藉由將預定的直徑的差設定在預定的範 圍，來確保需要且足夠的對大直徑竿體內部的空氣通路。 第三發明的釣竿，在第一或二發明的釣竿，其中大直 徑竿體，其嵌合錐桿部分的錐度爲2/1 0 0 0〜4/ 1000，第一錐桿部分的錐度爲20/1000〜30 /100 0，第二錐桿部分的錐度爲0 . 1/1000〜 2.0 / 1 0 0 0。 在這種釣竿，藉由將大直徑竿體的各部分的錐度設定 在預定的範圍。藉由依序設定該程度的錐度，來解除大直 徑竿體與小直徑竿體的活塞化。 【發明實施型態】 以下參照圖面來說明本發明的一種實施型態。 【釣竿的全體構造】 採用本發明的一種實施型態的釣竿，如第1圖所示， 是具有··主竿1、連結於主竿1的前側的主上竿2、連結 於主上竿2的前側的中竿3、以及連結於中竿3的前側的 前頭細竿4。這些主竿1〜前頭細竿4是由將合成樹脂浸 漬在碳纖維或玻璃纖維等的預浸漬材料所形成的前端較細 的筒狀構件。而且，主上竿2〜前頭細竿4是可從前側出 入自如地依序插入到竿根側的竿體內部，是以所謂的抽出 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ~ I 11— I—1T*~ — (請先閱讀背面之注意事項再填寫本頁) 1248786 A7 B7 五、發明説明（5 ) 形式來連結。釣竿體的支數是因應需要而以釣竿全體的長 度來作適當設定，並不限定於四支，可以用任何支數。 在位於最前側的前頭細竿的前側端部是連結有釣線卡 止構件5。在該釣線卡止構件5是連結著釣線L。釣線卡 止構件5可以用習知的構造，例如，稱作「綁線」的毛線 狀構件、或在筒狀體的內部配置旋轉珠及旋轉體’而可將 釣線卡止於該旋轉體。針對該前頭細竿，爲了小直徑化也 可以使用與其他竿體不相同的實心的竿體。 【主竿1與主上竿2的構造】 這種釣竿的主上竿2與主竿1是不管在延伸狀態或在 收容狀態都可以相互固定。以下是詳細顯示主竿1與主上 竿2的構造。 首先針對主上竿1來加以說明。 如第2圖所示，主竿1，是全體實施了越向前側直徑 越小的錐桿處理的筒狀體。而且，在竿根側端部是裝卸自 如地安裝有尾栓部6。在主竿1的竿根側端部內部是配置 有螺母構件7，在其前側的內周面是配置有擋環8。尾栓 部6是裝卸自如地螺合於該螺母構件7。 該擋環8在其內周面是具有朝直徑內側方向突出且朝 軸方向延伸的複數的突起部，在該突起部的內周是與主上 竿2的竿根側端部（嵌合公部2 a )的外周面嵌裝著。突起部 的前側端部也可以實施和緩的導角處理。 主竿1 ，詳細來說是由以下的部分變化的各個錐桿部 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） 衣-- (請先閱讀背面之注意事項再填寫本頁) 訂 經濟部智慧財產局員工消費合作社印製 -9- 1248786 A7 B7 五、發明説明（6 ) (請先閱讀背面之注意事項再填寫本頁) 分所構成。如第2圖模式性地顯示’該主竿1 ’是具備有 :從前側端部到竿根側其內周面成爲嵌合母部的嵌合錐桿 部分1 〇、連續於嵌合錐桿部分1 〇的竿根側且越向竿根 側直徑越大的第一錐桿部分1 1、以及連續於第一錐桿部 分1 1的竿根側且越向竿根側直徑越大而傾斜錐度較第一 錐桿部分1 1更小的第二錐桿部分1 2、連續於第二錐桿 部分1 2的竿根側且越向竿根側直徑越大而傾斜錐度較第 二錐桿部分1 2更大的第三錐桿部分1 3、以及連續於第 三錐桿部分1 3的竿根側且越向竿根側直徑越大而傾斜錐 度較第三錐桿部分更小的第四錐桿部分1 4。 嵌合錐桿部分1 0，是讓後述的主上竿2的嵌合公部 2 a的外周面嵌裝於其內周面的部分。會影響到主竿1的 全體的長度等的構造，例如，當將主竿1全體的軸方向長 度假設爲7 0 0〜8 0 Omm左右時’例如’其軸方向長 度爲1 0 0〜1 5 0mm左右，錐度是設定爲2/ 1000〜4/1000左右。 經濟部智慧財產局員工消費合作社印製 第一錐桿部分1 1，是與嵌合錐桿部分1 0相比是向 竿根側較大程度地擴大直徑的部分。該部分也會影響到主 竿1的全體的長度等，例如，根據上述假設的話，其軸方 向長度爲較短的2 0〜4 0mm左右，錐度是設定爲較大 的20/1000〜30/1000左右。 第二錐桿部分1 2，與第一錐桿部分1 1相比是較平 緩地向竿根側擴大直徑的部分。第二錐桿部分1 2也可以 設定成錐度幾乎沒有變化的直桿部。該部分也會影響到主 本&張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 7Γ" " 1248786 A7 B7 五、發明説明（7 ) 竿1的全體的長度等，例如，根據上述假設的話，其軸方 向長度爲佔有主竿1的主要部分的較長的3 0 0〜5 0 0 mm左右，錐度是設定爲較小的0 · 1/1 〇 〇 0〜2/ 1 000左右。其錐度最好是1 . 0/1000〜1 . 5 / 1 0 0 0。 第三錐桿部分1 3，與第二錐桿部分1 2相比是較大 程度地向竿根側擴大直徑的部分。根據上述假設的話，其 軸方向長度爲較短的2 0〜5 0mm左右，錐度是設定爲 較大的3 0/1 000〜40/1 00 0左右。而在該第 三錐桿部分1 3的軸方向兩端，爲了緩和地保持連續著的 第二錐桿部分1 2及後述的第四錐桿部分1 4的連續性， 也可以在軸方向設定緩和的曲面。 第四錐桿部分1 4，與第三錐桿部分1 3相比是較小 程度地向竿根側擴大直徑的部分。根據上述假設的話，其 軸方向長度爲較短的1 0〜3 0mm左右，是設定爲幾乎 沒有錐度的0 · 1/1000〜1 . 0/1000左右， 或是設定爲直桿部。在該第四錐桿部分1 4，是配置有上 述的螺母構件7及擋圈8。 以下針對主上竿2來加以說明。 如第3圖模式性地詳細顯示，主上竿2，與主竿1同 樣地，是實施了前端較細的錐桿處理的筒狀體。其竿根側 端部外周面是形成爲直徑較其他部分更大，其竿根側端部 外周面是作爲嵌合公部2 a。在主上竿2的竿根側端部也 可因應需要配置底栓部9。該嵌合公部2 a，例如是藉由 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -- (請先閲讀背面之注意事項再填寫本頁) -訂 經濟部智慧財產局員工消費合作社印製 -11 -1248786 A7 __B7_ V. OBJECT OF THE INVENTION (Technical Field of the Invention) The present invention relates to a fishing rod in which a plurality of carcasses are coupled, and in particular, the main crucible and the main upper crucible connected to the front side thereof are taken out in a drawn form. By connecting the fishing rods, the length of the entire fishing rod can be adjusted by adjusting the positional relationship. [Conventional Technology] In the conventional fishing rod type, a plurality of tubular fishing rod bodies can be sequentially inserted into the fishing rod body from the front side of the fishing rod body. When fishing is carried out, each fishing rod body is sequentially taken out to the front side to be fitted and fixed into a fishing rod body for use. On the other hand, when it is to be accommodated, the front fishing rod body is sequentially housed in the fishing rod body on the root side, and the state is miniaturized. In the traditional withdrawal form of the fishing rod, the main squat and the main squat adjust its positional relationship, and there is some way to make the length of the corpus callosum change to fish. The main mast of the fishing rod processed in this manner has a first fitting female portion on the inner peripheral surface of the front side end portion and a second fitting female portion on the inner peripheral surface of the root end side, the first fitting female portion or The second fitting female portion is fitted to the root side end portion of the main upper jaw and the circumferential surface of the front side, respectively. In the state in which the main upper jaw is pulled out to the front side (hereinafter referred to as "extended state"), the fitting male portion of the main upper jaw is fitted to the first fitting female portion of the main jaw, and is inserted into the main upper jaw. In the state inside the crucible (hereinafter referred to as "storage state"), the fitting male portion of the main upper jaw is fitted to the second fitting female portion of the main crucible. In this way, the main squat and the main squat can be fitted and fixed in either the "extended state" or the "accommodating state", and the length of the corpus can be changed according to the situation to perform fishing. This paper scale applies to the national standard (CNS) A4 specification (210X297 mm) (please read the notes on the back and fill in the basics) - Order the Ministry of Economic Affairs, Intellectual Property Bureau, Staff Consumer Cooperatives Print - 5 - Ministry of Economics Property Bureau employee consumption cooperative printing 1248786 A7 _ B7____ V. Invention description (2) [The subject to be solved by the invention] This type of fishing rod in the form of withdrawal, or the form of withdrawal, can be obtained by the relationship between the main skeleton and the main captain. In order to increase the mutual fitting force, the fishing rod of the form in which the length of the entire fishing rod is adjusted is set to precisely match the inner diameter of the fitting female portion of the main jaw with the outer diameter of the main upper jaw. Therefore, the main cymbal acts like a cylinder of a piston, and sometimes the air resistance when the main cymbal is pulled out or accommodated from the main sputum becomes large, and the main squatting movement of the main squat is hindered. That is to say, the main crucible is a large-diameter crucible located on the most root side, although it can be formed into a narrow cylindrical body at the front end, and generally a single taper or a small taper with little change in taper. Therefore, if the diameter of the fitting female portion of the main jaw and the fitting male portion of the main upper jaw are set to be closely matched, the gap through which the air passes outside the fitting portion (the difference in diameter between the two jaws) It will be small, so it may produce a phenomenon of pistonization as described above. In particular, this is particularly the case when there is a solid body or a fishing line locking member on the front side of the main upper jaw. Such a phenomenon of the piston of the main jaw and the main upper jaw may cause water or dust to be sucked from the gap of the bottom bolt attached to the root end side of the main jaw, and may also generate strangeness when entering and exiting the main jaw. sound. An object of the present invention is to provide a fishing rod capable of smoothly allowing a main cockroach to enter and exit a main raft. [Means for Solving the Problem] The fishing rod of the first invention is equipped with a large-diameter cymbal, and is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 public sauce) I 1T---- --"" (Please read the note on the back and fill out this page) -6 - Ministry of Economic Affairs Intellectual Property Bureau Staff Consumer Cooperative Printed 1248786 A7 ___B7_ V. Invention Description (3) Forms can be linked freely Small diameter corpus callosum on the anterior side of a large diameter corpus callosum. The large-diameter body has a fitting taper portion that becomes a fitting female portion from the front end portion to the root side of the crotch root side, and is continuous with the crotch root side of the fitting taper bar portion and has a diameter toward the crotch root side. The larger the first tapered rod portion, and the second tapered rod portion that is continuous with the root side of the first tapered rod portion and has a larger diameter toward the root side than the first tapered rod portion. On the other hand, the small-diameter body is a fitting portion having a larger diameter than the other portions and which can be fitted to the inner peripheral surface of the fitting tapered portion. The large-diameter carcass and the small-diameter carcass are connected in a withdrawal form, and the small-diameter carcass can be freely inserted into a large-diameter crucible. In fishing, the small-diameter carcass is pulled out to the front side of the large-diameter carcass, and the fitting portion of the small-diameter carcass is fitted and fixed to the inner peripheral surface of the fitting conical rod portion of the large-diameter carcass. At the time of accommodation, the fitting is released to accommodate the small-diameter body into the large-diameter body. The large-diameter body is a first cone portion having a sloped taper portion that becomes large, the first cone portion being a difference in inner diameter of the fitting tapered rod portion and the second tapered rod portion of the large-diameter body Expanded. Thereby, the difference between the inner diameter of the second tapered rod portion of the large-diameter body and the outer diameter of the small-diameter body (especially the outer diameter of the fitting male portion) becomes large, so that sufficient balance is maintained therebetween. Gap. This clearance suppresses the so-called pistonization phenomenon. By partially arranging the first tapered portion, it is also possible to prevent the taper of the large-diameter body from being unduly too large. The fishing rod according to the second invention, in the fishing rod of the first invention, wherein the inner diameter of the front end portion of the second tapered rod portion of the large-diameter body and the size of the embedded paper of the small-diameter body are applicable to the Chinese National Standard (CNS) A4. Specifications (210X297 mm) n II ϋ 111 — I — (Please read the notes on the back and fill out this page) 1248786 Ministry of Economic Affairs Intellectual Property Bureau Staff Consumer Cooperatives Print A7 B7 V. Inventions (4) The difference in outer diameter is set to about 0.5 mm to 1 mm. In this type of fishing rod, the air passage inside the large-diameter body is required and sufficient by setting the difference in the predetermined diameter to a predetermined range. A fishing rod according to a third aspect of the invention, wherein the fishing rod of the first or second invention, wherein the large diameter body has a taper of the fitting taper portion is 2/1 0 0 0 to 4/1000, and the taper of the first taper portion is 20 /1000~30 /100 0, the taper of the second taper portion is 0.1/1000~2.0 / 1 0 0 0. In this type of fishing rod, the taper of each portion of the large-diameter carcass is set to a predetermined range. The piston of the large diameter body and the small diameter body is released by sequentially setting the degree of taper. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. [Overall structure of the fishing rod] As shown in Fig. 1, the fishing rod according to an embodiment of the present invention has a main upper jaw 1, a main upper jaw 2 connected to the front side of the main crucible 1, and a main upper jaw. The middle cymbal 3 on the front side of the second side and the front cymbal 4 connected to the front side of the middle cymbal 3. These main rims 1 to 4 are fine cylindrical members which are formed by impregnating a synthetic resin with a prepreg such as carbon fiber or glass fiber. Moreover, the main upper 〜 2 〜 front 细 fine 竿 4 is insertable into the 竿 侧 竿 内部 依 依 , , , , , , , , , 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 210 PCT) ~ I 11— I—1T*~ — (Please read the notes on the back and fill out this page) 1248786 A7 B7 V. Inventions (5) Forms are linked. The number of the fishing rod body is appropriately set according to the length of the fishing rod as needed, and is not limited to four, and any number can be used. The fish line retaining member 5 is coupled to the front end of the front end of the front end. The fishing line locking member 5 is connected to the fishing line L. The fishing line locking member 5 can be locked to the rotation by a conventional structure, for example, a yarn-like member called a "binding line" or a rotating bead and a rotating body disposed inside the cylindrical body. body. For the front fineness, a solid body different from other carcasses may be used for the small diameter. [Structure of Main 竿 1 and Main Upper 竿 2] The main cymbal 2 and the main cymbal 1 of the fishing rod can be fixed to each other regardless of the extended state or the accommodating state. The following is a detailed display of the structure of the main 竿 1 and the main 竿 2 . First, explain the main 竿1. As shown in Fig. 2, the main cymbal 1 is a tubular body in which the entire diameter of the front side is smaller and the cone is processed. Further, the tail plug portion 6 is detachably attached to the root end portion. The nut member 7 is disposed inside the root end portion of the main jaw 1, and the retaining ring 8 is disposed on the inner peripheral surface of the front side. The tail bolt portion 6 is detachably screwed to the nut member 7. The retaining ring 8 has a plurality of protrusions that protrude in the inner side in the diameter direction and extend in the axial direction, and the inner circumference of the protrusion 8 is the end portion of the main upper jaw 2 (the fitting end) The outer peripheral surface of the portion 2 a ) is embedded. The front end portion of the projection portion can also be subjected to a gentle guide angle treatment. Main 竿1, in detail, is changed by the following parts. The paper size of this cone is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm). -- (Please read the notes on the back and fill in the form) Page) Order Ministry of Economic Affairs Intellectual Property Bureau Staff Consumer Cooperative Printed -9- 1248786 A7 B7 V. Invention Description (6) (Please read the note on the back and fill out this page). As shown in Fig. 2, the main shank 1 is schematically provided with a fitting tapered rod portion 1 成为 which is a fitting female portion from the front end portion to the root side, and is continuous with the fitting tapered rod The first tapered rod portion 1 1 having a larger diameter on the root side of the portion 1 and the side toward the root side of the root, and the larger the diameter of the root portion on the base side of the first tapered rod portion 1 1 The second tapered rod portion 12 having a smaller taper than the first tapered rod portion 11 is continuous with the root side of the second tapered rod portion 12 and has a larger taper than the second tapered rod. The portion 1 2 is larger than the third tapered rod portion 13 and continuous to the root side of the third tapered rod portion 13 and the larger the diameter toward the root side, the smaller the inclined taper is than the third tapered rod portion The four-cone portion is 14. The fitting tapered rod portion 10 is a portion in which the outer peripheral surface of the fitting male portion 2 a of the main upper jaw 2 to be described later is fitted to the inner peripheral surface thereof. A structure that affects the length of the entire main cymbal 1 or the like. For example, when the axial length of the main cymbal 1 is assumed to be about 7 0 0 to 8 0 Omm, for example, the length in the axial direction is 1 0 0 to 1 Around 50 mm, the taper is set to about 2/1000~4/1000. Printed by the Intellectual Property Office of the Ministry of Economic Affairs, the Consumer Cooperatives Co., Ltd. The first tapered rod portion 1 1 is a portion that is enlarged to a greater extent toward the root side than the fitting tapered rod portion 10 . This portion also affects the length of the entire main cymbal 1, etc., for example, according to the above assumption, the length in the axial direction is about 20 to 40 mm, and the taper is set to be larger 20/1000 to 30/ About 1000. The second tapered rod portion 12 is a portion that is more smoothly expanded toward the root side than the first tapered rod portion 1 1 . The second tapered rod portion 12 can also be set as a straight rod portion with almost no change in taper. This part will also affect the main Chinese & Zhang scale applicable Chinese National Standard (CNS) A4 specification (210X297 mm) 7Γ""" 1248786 A7 B7 V. Invention description (7) The length of the whole of 竿1, etc., for example, According to the above assumption, the length in the axial direction is about 3 0 0 to 500 mm occupying the main portion of the main crucible 1 and the taper is set to be smaller 0 · 1/1 〇〇 0 to 2 / 1 About 000. The taper is preferably 1. 0/1000~1 . 5 / 1 0 0 0. The third tapered rod portion 13 is a portion that enlarges the diameter to the root side to a greater extent than the second tapered rod portion 12. According to the above assumption, the length in the axial direction is about 20 to 50 mm, and the taper is set to be about 3 0/1 000 to 40/1 00 0. In order to gently maintain the continuity of the continuous second tapered rod portion 1 2 and the fourth tapered rod portion 14 to be described later, the axial direction of the third tapered rod portion 13 can be set in the axial direction. A gentle surface. The fourth tapered rod portion 14 is a portion that is expanded to a smaller extent toward the root side than the third tapered rod portion 13 is. According to the above assumption, the length in the axial direction is about 10 to 30 mm, which is set to 0. 1/1000 to 1. 0/1000 which is almost no taper, or is set to the straight portion. In the fourth tapered rod portion 14, the nut member 7 and the retaining ring 8 described above are disposed. The following is a description of the main upper 竿2. As shown in detail in Fig. 3, the main upper cymbal 2, similarly to the main cymbal 1, is a cylindrical body that has been subjected to a tapered tip end treatment. The outer peripheral surface of the root side end portion is formed to have a larger diameter than the other portions, and the outer peripheral surface of the root end portion is a fitting male portion 2a. The bottom plug portion 9 can also be configured as needed at the root end portion of the main upper jaw 2. The fitting public part 2 a, for example, is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) by the paper scale - (please read the note on the back side and then fill in the page) - Order the Intellectual Property Office of the Ministry of Economic Affairs Employee Consumption Cooperative Printed -11 -