200923221 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種連接桿，胜^ θ & 接桿。 糾_是指m縮式連 【先前技術】 一如圖1、2所示’-般連接桿10具有一插孔u用以供 一工具頭(圖未示’例如-字工具頭、十字工具頭)插置，及 插置& 12用以供一套筒（圖未示）套置結合，該連 雖然具有可供前述工具頭、套筒套置結合以供使用的功能 ，但實務上存有無法調整長度，導致使用較*方便的缺失 ’常見的使用方式是將-連接桿1G的插孔u套置在另一連 接杯1G的插置段12以增加整體長度，惟此種使用方式不 仁而要再化費工時套接組裝、拆卸，還存有需要備置多數 支連接杯10才能符合使用需求的缺失。 【發明内容】200923221 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a connecting rod, a win θ & Correction_refers to m-shrinking [Prior Art] As shown in Figures 1 and 2, the connecting rod 10 has a socket u for a tool head (not shown), for example, the word tool head, cross tool The head is inserted, and the insert & 12 is used for a sleeve (not shown) to be sleeved, and the joint has the function of being able to be used for combining the tool head and the sleeve, but in practice, There is an inability to adjust the length, resulting in the use of a more convenient; the usual way of using is to insert the jack u of the connecting rod 1G in the interposing section 12 of the other connecting cup 1G to increase the overall length, but such use In a way that is inconsistent, it is necessary to re-assemble the assembly and disassembly of the working hours. There is also a need to prepare a majority of the connecting cups 10 in order to meet the lack of use requirements. [Summary of the Invention]
因此，本發明之目的是在提供一種可以調整長度以提 高使用便利性’及可符合❹需求的伸縮式連接桿。 於是’本發明伸縮式連接桿是用以供一工具頭插置及 供-套筒套置’包含一外管、一内桿、一第一彈性件、一 控制件、一擋止件，及—定位滾珠。 該外官包括圍繞—軸線並形成一角形内孔的一角形内 官面’一圍繞該軸線的外管面，分別連結該内管面與該外 官面的一第一端面與—第二端面，一形成於該外管面的擋 % ’及一連通該外管面與該内管面並靠近該第一端面的徑 200923221 向穿孔。 該内桿是插置入該外管的角形内孔並可沿該軸線移動 ，包括-面對該徑向穿孔的第_桿面，及設置於該 面的多數個定位凹部。 干 該第一彈性件套置在該外管外。 該控制件套置在該外管外並靠近該第一端面，包 f 繞該軸線並形成-内孔的—内環面…圍繞㈣線的_ 分別連結該内環面與該外環面的一第一端面與一第： 知面自5亥第一端面朝向該第二端面設置並連通該内孔 =大：第一容置孔，一形成在該内孔與該第—容置孔交 連通該内孔的較大徑;I:面朝向該第-端面設置並 第二”…/及一形成在該内孔與該 备乂 |處的第二擋面，該第一彈性件位於該第二 容置孔内並被限位在該外管的擋環與該第二擋面之間，: 6玄控制件怪朝向該外管的第-端面移動。 第-=止件安裝於該外管的外管面用以播止該控制件的 該定位滾珠安裝在該外管的徑向穿 控制件與該内桿之間。 醫位在5亥 :由上述組成，當該定位滚珠進入其中一定位凹部， 面^呈定位當將該控料朝㈣外 =!:孔：該定位滾珠可沿徑向移動並進入該控制件 外脫離該定位凹部，使該内捍能相對於該 祕線移動，進而可調整該伸縮式連接桿的長度， 200923221 使本發明具有❹較方便及可符合使用需求的特性。 【實施方式】 本發明伸縮式連接桿前述以及其他技術内容、特點與 功效，在以下配合參考圖式之一較佳實施例的詳細說財 ，將可清楚的明白。 如圖3、4、5所不，本發明伸縮式連接桿2該較佳 實施例包含—外管2G、—内桿％、-第-彈性件奶、一控 制件5〇、一擋止件60、一定位滚珠及一限位單元80 〇 該外官2G是沿—軸線！延伸，包括圍繞軸線】並形 成'角形内孔21的一角形内管面22 一圍繞該轴線！的圓 形外官面23 ’分別連結該内管面22與該外管面23的一第 -端面24與-第二端面25，—形成於該内管面。並靠近 Μ-端面24的限位環槽26，分別形成於該外管面U的 -播=7與-環溝28’及一連通該外管面23與該内管面 22並罪近該第一端面24的徑向穿孔29。 該角形内孔21靠近該第二端面25的孔段是用以供一 棘輪扳手的驅動頭插置連結（圖未示）。 该内桿30為一角形桿體，用以插置入該外管的角 形内孔21並可沿該軸線！往復移動但不能轉動，該内桿％ 包括一面對該外管20的徑向穿孔29的第一桿面31，—與 該第-桿面31呈相背設置的第二桿面32,呈相背設置的 苐—端面33與一第二端面34,設置於該第一桿面Μ的夕 數個定位凹部35，—設置於該第二桿面32並靠近該第二二 200923221 面34的容置孔36，一圍繞該第一桿面31與該第二桿面32 並靠近該第-端面33的凸緣37，及一沿該徑向安裝於該内 桿30並靠近該第一端面33的定位組合體38。 剛述定位凹部35在本實施例是舉三個為例進行說明， 可區分成最靠近該第一端面33的第一定位凹部351、次靠 近該第一端面33的第二定位凹部352，及遠離該第—端面 33的第二定位凹部353。此外，前述定位凹部35可為如圖 3所不呈定位孔的型態，也可為如圖丄丄所示呈與該軸線工 垂直的定位凹槽型態。 該内桿30靠近該第一端面33的桿段是用以供—套筒 92套置連結，並可藉由該定位組合體％提高該套筒μ與 該内桿30的套結強度。 s亥第一彈性件4〇在本較佳實施例中為一壓縮彈簧，是 套置在該外管20的外管面23並靠近該第一端面24，具有 一被s玄擋環27擋止的第一端腳41，及一第二端腳42。 該控制件50為一套環，是套置在該外管2〇的外管面 23並靠近該第一端面24,包括圍繞該軸線1並形成一内孔 51的一内環面52，一圍繞該軸線ζ的外環面，分別連結 5亥内環面52與該外環面53的一第一端面54與一第二端面 55，一自該第一端面54朝向該第二端面55設置並連通該 内孔51的較大徑第一容置孔56，一形成在該内孔51與該 第—容置孔56交界處的第一擋面57, 一自該第二端面55 朝向該第一端面54設置並連通該内孔51的較大徑第二容 置孔58 ’及一形成在該内孔51與該第二容置孔58交界處 200923221 的第二擋面59。 該第二措面 抵，使該控制件 59疋被該第-彈性件40的第二端腳42彈 5〇可恆朝向該外管2〇的第-端面24移動 手握二= 滑面段-具有可供使用者的 為多數凹環、凸環 ^ 5〇的作用’該非滑面段531可 該撞止件 於該外管2〇的^= — C形扣環，是扣置固定 e 的％溝28並突屮访认技=〜 有可阻撞該控制件5。的第一；/ 3 ’該擒止件6。具 因受到該第-彈性件4。:彈:::持 移動的作用。 ^張力而持續朝向該第-端面24 20的徑向 20的内管 70被限位 遠定位滾珠7〇是呈可滚動地安裝在該外管 穿孔29内’且該定位滾珠7()的直徑大於該外管 :22與該外管面23之間的距離，及該定位滾珠 在讀控制件50與該内桿3〇之間。 ^位單元8G包括分別安裝在該内桿3G的容置孔36 内的一第二彈性件81及-定位銷82。該第二彈性件81在 本較佳實施例中為-壓縮彈簧，可施予該定位銷82 一恆朝 向該外管20移動的彈推力。 使用時，可視需要的使用長度調整該内桿3〇相對於該 2管20的位置，進而改變該伸縮式連接桿2的整體長度， 當將該内桿30推入該外管20内，及該定位滾珠7〇進入該 第—定位凹部351時，該伸縮式連接桿2的整體長度最短 200923221 ，藉由該定位滾珠70盥該第一— 使該内;P川强，曰 、 疋位凹部351的相互卡置， 張及二4 4定位’此時，呈該第-彈性件40自由彈 =該控制件50的内孔51位於該定位滾珠7〇外，且: 觸該定位滾珠7〇，使該 向移動的狀態，同時，該内 个“仫 20的第-端面24撞止。 的凸緣37恰好被該外管 要調整該伸縮式連接桿2的長度，如圖10、3所干 移首=該控制件50往該外管20的第二端面25的方向推 多’㈣’呈該第-彈性件40被塵縮，及該控制件50的 =置孔 '位於該定位滾珠7。外的狀態，因為該第一 7〇且、儿的7孔让較該内孔51的孔徑大，所以該定位滾珠 古、以徑向移動的m然後將該内桿3。沿該軸線工 —〜。拉出該外f 2G外，此時’該定位滚珠7G脫離該第 :定位凹部351並沿該徑向移動進入該第-容置孔56内， =内桿30的第二定位凹部352或第三定位凹部切對準 4位滾珠7G，則該定位滾珠7()可自動進人該第二定位凹 部352或該第三定位凹部⑸，如圖6、7所示，當該定位 滾珠7〇自動進入該第二定位凹部352,再鬆放該控制件Μ ，就可藉由該第一彈性件4〇的回復彈力使該控制件5〇復 位’並再度呈該控制件5〇的内孔51位於該定位滾珠7〇外 :且該内環面52壓觸該定位滾珠7〇 ’使該定位滾珠7〇不 能沿徑向移動的狀態。 如圖8、9所示，當該定位滾珠7〇自動進入該第三定 位凹部353，且鬆放該控制件5〇，同樣可藉由該第—彈性 10 200923221 件40的回復彈力使該控制件5()復位，及可藉由該定位滚 珠7〇與該第三定位凹部353的相互卡置，使該内桿3〇 ^ 定位狀態，此時，該伸縮式連接桿2的整體長度最長，同 時’該限位單& 8G對準該外管20的限位環槽26，藉由該 第二彈性件81施予該定位銷82的彈推力，就可以使該定 位銷82自動沿徑向移動並進入該限位環槽％内，在此狀 態下’就無法再將該内桿30往外拉，進而可以防止該内桿 30脫離該外f 20，除了此狀態外，該限位單元8〇的第: 彈性件81都是呈被壓縮狀態（見圖5、7、i 〇 )。 歸納上述，本發明伸縮式連接桿具有如下所述之功效 及優點’故媒實能達成發明目的： 因為本發明該伸縮式連接桿2可以依使用需求調整長 度，且可藉由該定位滾珠70與該第一定位凹部351或該定 二定位凹部352或該第三定位凹部353的相互卡置，使該 内桿30獲得定位，藉此使本發明具有使用較方便，可節省 組裝、拆卸工時，及可符合使用需求的功效及優點。 惟以上所述者，僅為本發明之一較佳實施例而已，當 不能以此限定本發明實施之範圍，即大凡依本發明申請專 利範圍及發明說明内容所作之簡單的等效變化與修飾，皆 仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一習用連接桿的一立體圖； 圖2是該習用連接桿的一剖視圖； 圖3疋本發明伸細式連接桿一較佳實施例的一分解立 200923221 體圖； 圖4疋該較佳實施例的一組合立體圖 種長度的狀態； 圖5疋—取自圖4的組合剖視圖； 圖6是該較佳實施例的一組合立體圖， 種長度的狀態； 圖7是一取自圖6的組合剖視圖； 圖8是遠較佳實施例的一組合立體圖， 種長度的狀態； 圖9是一取自圖8的組合剖視圖； 圖1 0是一類似於圖9的視圖，說明_ 動狀態；及 圖1 1是一類似於圖3的視圖，說明》 型態。 i- ，說明處於第— '說明處於第二 說明處於第三 -内桿處於可移 7 —種定位凹部 12 200923221 【主要元件符號說明】 2... ...伸縮式連接桿 40... .第一彈性件 20.. ..外管 41... .第一端腳 21.. ..角形内孔 42... .第二端腳 22.. ..内管面 50... .控制件 23.. ..外管面 51... .内孔 24.. ..第一端面 52... .内環面 25·. ..第二端面 53... .外環面 26.. ..限位環槽 531. ..非滑面段 27.· ..擔環 54... .第一端面 28.· ..環溝 55... .第-端面 29·· ..徑向穿孔 56··· .第一容置孔 30.. ..内桿 57... .第一指面 3 1·· ..第一桿面 5 8... .第二容置孔 32·· ..第二桿面 59... .第二擋面 33.. ..第一端面 60... .擋止件 34., ..第二端面 70... .定位滾珠 35·· ..定位凹部 80.·· .限位單元 351 ...第一定位凹部 81... .第二彈性件 352 ...第二定位凹部 82... .定位銷 353 ...第三定位凹部 92... .套筒 36.. ..容置孔 I ... ..軸線 37.· ..凸緣 38.. ..定位組合體 13SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a telescopic connecting rod which can be adjusted in length to improve ease of use and which meets the needs of the crucible. Thus, the telescopic connecting rod of the present invention is used for inserting a tool head and providing a sleeve sleeve comprising an outer tube, an inner rod, a first elastic member, a control member and a stopper. - Position the balls. The outer officer includes an outer inner surface surrounding the axis and forming an angular inner hole, and an outer tube surface surrounding the axis, respectively connecting the inner tube surface and a first end surface and the second end surface of the outer surface a stop % ' formed on the outer tube surface and a diameter 200923221 communicating with the outer tube surface and the inner tube surface and close to the first end surface are perforated. The inner rod is inserted into the angular inner bore of the outer tube and is movable along the axis, including - a face facing the radially perforated face, and a plurality of positioning recesses disposed on the face. The first elastic member is sleeved outside the outer tube. The control member is sleeved outside the outer tube and adjacent to the first end surface, and the package f surrounds the axis and forms an inner ring surface of the inner hole. The inner ring surface and the outer ring surface are respectively connected around the (four) line. a first end face and a first: a face is disposed from the first end face of the 5 hai toward the second end face and communicates with the inner hole=large: a first accommodating hole formed in the inner hole and the first accommodating hole a larger path connecting the inner hole; an I: face disposed toward the first end face and a second "..." and a second stop surface formed at the inner hole and the spare part, the first elastic member being located The second receiving hole is constrained between the retaining ring of the outer tube and the second blocking surface, and: 6 a control member moves toward the first end surface of the outer tube. The first-stop is mounted on the The outer tube surface of the outer tube is used to broadcast the positioning ball of the control member between the radial wear control member of the outer tube and the inner rod. The medical position is at 5 hai: composed of the above, when the positioning ball enters One of the positioning recesses, the surface is positioned when the control material is directed toward (4) outside =!: hole: the positioning ball can move radially and enter the control member to be separated from the positioning recess, so that The inner cymbal can move relative to the secret line, and the length of the telescopic connecting rod can be adjusted. 200923221 makes the invention more convenient and can meet the requirements of use. [Embodiment] The telescopic connecting rod of the present invention has the foregoing and other The technical content, features and effects will be clearly understood in the following detailed description of a preferred embodiment of the reference drawings. As shown in Figures 3, 4 and 5, the telescopic connecting rod 2 of the present invention is preferably preferred. The embodiment includes an outer tube 2G, an inner rod %, a first elastic member milk, a control member 5〇, a stopper 60, a positioning ball and a limiting unit 80. The outer 2G is along the axis Extending, including an angled inner tube surface 22 surrounding the axis and forming an 'angular inner bore 21'; a circular outer surface 23' surrounding the axis! respectively connects one of the inner tube surface 22 and the outer tube surface 23 The first end surface 24 and the second end surface 25 are formed on the inner tube surface, and adjacent to the limit ring groove 26 of the Μ-end surface 24, respectively formed on the outer tube surface U - 7 = - ring groove 28 And a radial perforation that connects the outer tube surface 23 with the inner tube surface 22 and sin close to the first end surface 24 The hole portion of the angled inner hole 21 adjacent to the second end surface 25 is for inserting and connecting a driving head of a ratchet wrench (not shown). The inner rod 30 is an angular rod for inserting into the hole. The angular inner bore 21 of the outer tube is reciprocable but not rotatable along the axis!, the inner rod % includes a first face 31 of a radial perforation 29 to the outer tube 20, and the first rod The surface 31 is opposite to the second surface 32 disposed opposite to each other, and the second end surface 33 and the second end surface 34 are disposed opposite to each other, and are disposed on the plurality of positioning recesses 35 of the first surface of the first surface. The two face 32 is adjacent to the receiving hole 36 of the second second 200923221 face 34, a flange 37 surrounding the first face 31 and the second face 32 and adjacent to the first end face 33, and a A positioning assembly 38 that is radially mounted to the inner rod 30 and adjacent to the first end surface 33. The positioning recess 35 is described as an example in the present embodiment, and can be divided into a first positioning recess 351 closest to the first end surface 33, a second positioning recess 352 next to the first end surface 33, and The second positioning recess 353 is away from the first end face 33. In addition, the positioning recess 35 may be in the form of a positioning hole as shown in FIG. 3, or may be a positioning groove type perpendicular to the axis as shown in FIG. The rod portion of the inner rod 30 adjacent to the first end surface 33 is for the sleeve 92 to be sleeved, and the sleeve strength of the sleeve μ and the inner rod 30 can be increased by the positioning assembly %. The first elastic member 4 in the preferred embodiment is a compression spring which is sleeved on the outer tube surface 23 of the outer tube 20 and adjacent to the first end surface 24, and has a block blocked by the snubber ring 27 The first end leg 41 and the second end leg 42 are stopped. The control member 50 is a set of rings that are sleeved on the outer tube surface 23 of the outer tube 2 and adjacent to the first end surface 24, and includes an inner annular surface 52 surrounding the axis 1 and forming an inner hole 51. A first end surface 54 and a second end surface 55 of the inner annular surface 52 and the outer annular surface 53 are respectively connected to the outer annular surface of the inner circumference, and a second end surface 55 is disposed from the first end surface 54 toward the second end surface 55. a first accommodating hole 56 that communicates with the larger diameter of the inner hole 51, and a first dam surface 57 formed at the boundary between the inner hole 51 and the first accommodating hole 56, from the second end surface 55 toward the first end surface 55 The first end surface 54 defines and communicates with the larger diameter second receiving hole 58 ′ of the inner hole 51 and a second blocking surface 59 formed at the intersection of the inner hole 51 and the second receiving hole 58 . The second surface is abutted so that the control member 59 is elastically biased by the second end leg 42 of the first elastic member 40 to be movable toward the first end surface 24 of the outer tube 2〇. - having a function of a plurality of concave rings and convex rings for the user's. The non-slip surface segment 531 can be a C-shaped buckle of the impact member on the outer tube 2, which is a fastening e The % ditch 28 and the sudden visit to the technology = ~ there is a barrier to the control 5 . First; / 3 'the stop member 6. The first elastic member 4 is received. : Bomb::: The role of holding the move. The inner tube 70 of the tension and continuing to the radial direction 20 of the first end surface 24 20 is restrained by the distal positioning ball 7 〇 being rotatably mounted in the outer tube perforation 29 and the positioning ball 7 () The diameter is greater than the distance between the outer tube: 22 and the outer tube surface 23, and the positioning ball is between the read control member 50 and the inner rod 3''. The position unit 8G includes a second elastic member 81 and a positioning pin 82 which are respectively mounted in the receiving holes 36 of the inner rod 3G. The second elastic member 81 is a compression spring in the preferred embodiment, and the locating pin 82 can be urged to move toward the outer tube 20. In use, the position of the inner rod 3〇 relative to the two tubes 20 can be adjusted according to the required length of use, thereby changing the overall length of the telescopic connecting rod 2, when the inner rod 30 is pushed into the outer tube 20, and When the positioning ball 7〇 enters the first positioning recess 351, the overall length of the telescopic connecting rod 2 is the shortest 200923221, and the first ball is made by the positioning ball 70; the P-strong, 曰, 疋 recess The 351 is mutually latched, and the two and four 4 are positioned. At this time, the first elastic member 40 is freely elasticized. The inner hole 51 of the control member 50 is located outside the positioning ball 7〇, and: the positioning ball 7 is touched. In the state of moving the direction, at the same time, the inner end portion 24 of the inner end of the crucible 20 is struck. The flange 37 is just adjusted by the outer tube to the length of the telescopic connecting rod 2, as shown in Figs. Dry shifting head = the control member 50 is pushed in the direction of the second end surface 25 of the outer tube 20 by '(4)', the first elastic member 40 is dusted, and the = hole of the control member 50 is located at the positioning ball 7. The outer state, because the first 7 holes and the 7 holes of the child are larger than the inner hole 51, the positioning ball is ancient, Moving to the m and then the inner rod 3. Working along the axis -. Pulling out the outer f 2G, at this time 'the positioning ball 7G is out of the first: the positioning recess 351 and moves along the radial direction into the first - In the accommodating hole 56, the second positioning concave portion 352 or the third positioning concave portion of the inner rod 30 is aligned with the 4-position ball 7G, and the positioning ball 7() can automatically enter the second positioning concave portion 352 or the third portion. The positioning recess (5), as shown in FIGS. 6 and 7, when the positioning ball 7〇 automatically enters the second positioning recess 352, and then releases the control member Μ, the rest elastic force of the first elastic member 4〇 can be used. The control member 5 is reset and the inner hole 51 of the control member 5 is again located outside the positioning ball 7〇: and the inner annular surface 52 is pressed against the positioning ball 7〇' so that the positioning ball 7〇 cannot follow the diameter As shown in FIGS. 8 and 9, when the positioning ball 7 〇 automatically enters the third positioning recess 353 and releases the control member 5 〇, the same can be used by the first elastic 10 200923221 40 Recovering the elastic force causes the control member 5 () to be reset, and the positioning of the positioning ball 7 〇 and the third positioning recess 353 can be mutually engaged. The inner rod 3〇 is positioned, at this time, the overall length of the telescopic connecting rod 2 is the longest, and the limit single & 8G is aligned with the limiting ring groove 26 of the outer tube 20, by the second elasticity When the member 81 applies the spring force of the positioning pin 82, the positioning pin 82 can be automatically moved in the radial direction and enter the limit ring groove %. In this state, the inner rod 30 can no longer be pulled out. Further, the inner rod 30 can be prevented from being separated from the outer f20. Except for this state, the first elastic member 81 of the limiting unit 8A is in a compressed state (see Figs. 5, 7, i 〇). The telescopic connecting rod of the present invention has the following advantages and advantages. The invention can achieve the object of the invention: because the telescopic connecting rod 2 of the present invention can adjust the length according to the use requirement, and the positioning ball 70 and the first A positioning recess 351 or the second positioning recess 352 or the third positioning recess 353 are mutually engaged to obtain the positioning of the inner rod 30, thereby making the invention more convenient to use, saving assembly and disassembly man-hours, and It can meet the efficacy and advantages of the use requirements. However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the present invention and the description of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional connecting rod; FIG. 2 is a cross-sectional view of the conventional connecting rod; FIG. 3 is an exploded view of a preferred embodiment of the present invention. Figure 4 is a perspective view of a combined perspective view of the preferred embodiment; Figure 5 is a cross-sectional view taken from Figure 4; Figure 6 is a combined perspective view of the preferred embodiment, a state of length; Figure 7 Figure 8 is a combined perspective view of the far preferred embodiment, a state of the length; Figure 9 is a combined cross-sectional view taken from Figure 8; Figure 10 is a similar view to Figure 9. View, description _ dynamic state; and Figure 1 1 is a view similar to Figure 3, illustrating the "type". I- , the description is in the first - 'in the description is in the second description in the third - the inner rod is in the movable 7 - the kind of positioning recess 12 200923221 [main symbol description] 2... telescopic connecting rod 40... The first elastic member 20.....the outer tube 41...the first end leg 21...the angular inner hole 42...the second end leg 22.....the inner tube surface 50... Control member 23... outer tube surface 51... inner hole 24... first end surface 52... inner ring surface 25·.. second end surface 53... outer ring surface 26.. ..Restricted ring groove 531.. non-slip surface segment 27.·..Resting ring 54.... First end face 28.·..Circle groove 55....-end face 29·· .. Radial perforation 56···. First accommodating hole 30... Inner rod 57.... First finger surface 3 1··.. First face 5 8.... Second capacity Positioning hole 32··.. second face 59.... second stop surface 33... first end face 60.... stop member 34., .. second end face 70... positioning Ball 35··. Positioning recess 80.·.. Limiting unit 351 ... First positioning recess 81.... Second elastic member 352 ... Second positioning recess 82... Positioning pin 353. .. third positioning recess 92.... sleeve 36... accommodating hole I ... axis 37 .. ..Flange 38.. ..Positioning assembly 13