A7 A7 經濟部中央樣準局貝工消费合作社印製 _B7____ 五、發明説明（） 1 (產業上之利用領域） 本發明係有關於自行車輪穀。更詳細的說，不採用形 成於輪毂之軸環上所形成之以三個連續之孔所構成之用於 插入輪輻之鈎掛孔，而使用一個孔之插通孔之方式之下， 在裝配車輪時，使輪輻不致於與它發生干涉之構造之自行 車輪穀。 (先前技術） 自行車用輪毅係，具有耐受於車輪之承受之靜負載及 動負載，且對於車輪賦予輕快且順暢之旋轉之機能者，而 輪輻係通常指輻射狀的連結車輪之周緣輪緣（鋼圈）部與 中心輪轂部之線狀部。輪輻係由，一端鈎掛於輪穀軸環之 輪輻孔之鈎部，及另一端形成有螺牙部之輪輻線，以及插 通於上述輪緣之輪輻孔嵌合於輪輻線之螺絲部而將繫緊輪 輻線而調整固定之接管所構成。 輪毅體之軸環上開設有用於插入輪輻而予以保持之輪 輻孔。輪輻孔有，由一個孔所成之插通孔（_孔），及由 三個連績的孔所形成之鈎掛孔之二種。鈎掛孔係具有不需 要拆卸帶鼓輪或多段飛輪等之裝配狀態下可更換輪輻之利 點，惟騎車過猛或碰衝導致輪緣彎曲時，輪輻之鈎掛部有 脫離鈎掛孔之虞。又鈎掛孔係在於裝配時，雖然插入輪輻 惟也可能發生輪輻之鈎掛部從輪輻中心之孔脫離之情形， 因此有時需在此中心孔塞入塡塞物，因此在裝配後也需要 有去除此塡塞物之作業，因此盡可能不採用此種鈎掛孔爲 本紙張尺度逋用中國國家標準（CNS ) A4规格（210X297公釐） (請先鬩讀背面之注意事項再填寫本頁) .装· 訂 293802 A7 _____B7_ 五、發明説明（2 ) 宜。 所以不使用鈎掛孔而仍然不需要拆下帶鼓輪或多段飛 輪之裝配完成狀態下可更換輪輻之構造即最理想。 (發明所欲解決之問題） 本發明以上述之技術背景所發明，可達成下述目的。 本發明之目的係在車輪之裝配時，提供由設於輪穀體 之由一個插通孔而仍然以由一個孔所成之插通孔也使輪輻 不會干涉裝配之自行車用輪毂者。 本發明其他目的係提供可以使車輪之裝配省力化之自 行車用輪穀也。 (解決問題之手段） 本發明係爲了達成上述問題採用下述之手段。 即本發明爲：主要係由： 經濟部中央樣準局貝工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 貫通輪穀之中心而插通之輪穀軸；及 以軸承而旋轉自如地支撑於上述輪毅軸之外周，平行 的被配置，且備有略圓形狀之輪輻插通孔之二個軸環及連 結上述二個軸環之管所成之輪穀體：及 對於上述輪毅體祗傳遞單方向之旋轉力而與一片鏈齒 輪所構成之具有自由轉輪之自行車用輪毅中， 具備有，當欲裝配車輪而由上述鏈輪側將輪輻插入於 上述輪輻插通孔#，爲了不需拆卸上述鏈輪之下可進行該 插入起見，於上述鏈輪之齒之齒底設置在於上述鏈輪之半 本紙張尺度適用中國國家標準（CNS ) A4规格（210X 297公釐） 經濟部中央標準局貝工消费合作社印製 A7 _B7___ 五、發明説明（3 ) 徑方向地切除之輪輻插入用開口者。 (發明之實施形態） 下面參照圖面說明本發明之實施形態。圖1係本發明 之實施形態之自行車用輪榖之正面圖。將本發明適用於呼 稱謂，「備有自由轉小鏈齒輪單元之輪穀」之實施形態。 兩端形成有公螺紋之輪穀軸2，係貫通於備有自由轉小鏈 齒輪單元輪穀1之中心地配置而成，在輪穀軸2之中心部 之外周，以隔有間隔地配置有管3。 管3之兩端成一體地固定有軸環4 ，5，而由管3及 軸環4 ，5構成輪穀體6。本實施形態1之輪毅體6之內 部乃被規格化之習知之構造，因此省略其說明。軸環5之 側面配置自由轉小鏈輪7。在自由轉小鏈輪7上成一體地 形成圓筒部8。圓筒部8之內部內藏有由習知之鋼珠所成 之軸承以及自由轉輪（飛輪）機構等。 自由轉輪（Free Wheel)機構乃具有祗將鏈條之單方 向之旋轉力予以傳遞之機能。備有棘輪機構等之單向離合 器。使用於本實施形態1之機構係靥習知且已被規格化因 此省略其構造之說明。 自由轉小鏈齒輪7係以螺紋蓋9所固定。輪轂體6即 藉構成軸承之鋼珠（不圚示）而旋轉自如地支撑於輪穀2 。鋼珠即由鋼珠押盤1 0，1 1推壓而被保持，鋼珠押盤 1 0 ，1 1係以固定螺帽1 2 ，1 3而固定於輪穀軸2。 軸環4，5之外周在等角度位置開設配置有插通孔（圓孔 本紙張尺度適用中國國家搮準（CNS ) A4规格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) .装. 訂 A7 293802 _____B7__ 五、發明説明（4 ) )1 4 » 1 5 ° 插通孔（圓孔）1 4，1 5係具有貫通於軸環4 ，5 ，之中心之孔，兩端被削平之一個孔。本實施形態之插通 孔（圓孔）1 4，1 5係在軸環4，5之外周等角度位置 分別配置有18個。自由轉小鏈齒輪7之鏈輪16係與習 用者形狀有所不同。圖2係圖1之右側面圖。， 圖3係鏈輪16之齒形之擴大圖。本實施形態1之鏈 輪（鏈齒輪）16係齒數14個之例子。鏈輪16係以角 度1 2 0度之間隔地在齒底2 1形成有輪輻插入用開口 2 0。沒有形成輪輻插入開口 2 0之齒底2 1係以半徑 r:之曲面2 2所形成。曲面2 2係接觸於齒底圓R2 。 連績於該曲面2 2形成有半徑r2之齒面2 3由而構成齒 尖2 4。齒尖2 4乃接觸於齒尖圓Ri。 輪輻插入用開口 2 0即，連續於齒面2 3而形成有平 面2 6，而該境界即形成有交線2 5。連績於平面2 6形 成有半徑r3之圓弧面2 7，平面2 6即形成圓弧面2 7 之接面。圓弧2 7即接於開口齒底圓R3 。同樣地連續於 圓弧面2 7形成有平面2 6 ，交線2 5 ，齒面2 3又平面 26即與半徑方向形成角度。 綜之鏈輪1 6之三處之輪輻插入用開口 2 0即切除了 齒底圓R2與開口齒底圓R3之差額h份置之空間。輪輻 插入用開口 2 0之間隔（寬度）即如果沒有大於略輪輻 30之鈎掛部31(參照圖4)之直徑時，即如後述不能 令鈎掛部3 1通過。 本紙張尺度逋用中國國家樣準（CNS ) A4規格（21〇X297公釐） (請先閲讀背面之注意事項再填寫本頁) .装. 訂 經濟部中央橾準扃員工消费合作社印裝 經濟部中央標準局員工消费合作社印裝 A7 ____B7 五、發明説明（5 ) 裝配方法 下面說明對於具有自由轉小鏈齒輪單元輪穀1上裝配 輪輻3 0之方法。 圖4係由外側將輪輻3 0插入於軸環4之一部份斷面 圖。 切線式輪輻車輪之裝配方法雖然有種種習知之方法。 惟通常係由軸環4之左右（由板厚之兩側）交互地，從輪 輻3 0之螺紋部3 2插入，而以鈞掛部3 1固定於插通孔 14° 從軸環4之左右方向插通輪輻3 0時，由於沒有構成 干涉之構件，因此不成問題。惟欲從軸環5之右方向（圖 示上方）插入輪輻3 0時，即貫通鏈輪7之齒底2 1而插 入於軸還5之插通孔14時，即由於齒底21會干涉輪輻 ，因此無法插入。 即當輪輻3 0之先端接觸於軸環4之外周面及插通孔 1 4時輪穀軸2之中心線與輪輻3 0之中心線所形成之角 度爲<9。 換言之，輪輻3 0之直徑d與插通孔1 4係由於直徑 之大小不同有間隙，因此實際上，即在插通孔1 4之內周 面且由上述輪殺軸2之中心之最大半徑R5之位置而輪輻 3 0之外周面與插通孔1 4會接觸。 因此角度Θ即由軸環4與軸環5之間隔，軸環4 之外周之半徑R4 ，軸環5之插通孔14之半徑R5之關 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） I - - n n ϋ n J. ^ n n n n I T n i I n n I K H$ ( (請先閱讀背面之注意事項再填寫本頁) A 7 B7 經濟部中央橾隼局貝工消费合作社印製 五、發明説明（6 ) 係而決定。 又軸環5與鏈輪7之間隔爲H2時，即近似地有下述 之關係即可以令輪輻3 0不致於與鏈輪發生干涉。 R3^(R4-(Hi+H2)*tan^) t an ^ = (R4 — (R5 — d) J/Hi R4係軸環之外周半徑， R5係上述軸環5之上述插通孔1 4之內周孔之最大 半徑， Hi係上述軸環4與軸環5之間隔， H2係上述軸環5與上述鏈輪7之上述輪轂軸之軸線 方向間隔。 又上述關係式乃適用於上述實施形態構造之自行車用 輪穀，並不一定適用於其他不同構造之自行車輪穀。又實 用上現在被使用之輪輻3 0之直徑d之最小直徑爲1 . 6 mm，所以形成可插入至少直徑1.6mm以上之輪輻 3 〇程度之輪輻插入開口 3 0爲宜，換言之輪輻插入開口 2 0之大小（約半徑r3之二倍）應爲輪輻3 0之直徑d 之1. 6mm以上，最好大於輪輻30之釣掛部之直徑爲 宜。 如上所詳述不致於與鏈輪7發生干涉的可以將輪輻 3 〇蓴穿於輪輻插入用開口 2 0插入於軸環5之插通孔 本紙張尺度適用中國國家橾準（CNS ) A4规格（210X 297公釐） (請先閱讀背面之注意事項再填寫本頁)A7 A7 Printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs _B7____ V. Description of the invention () 1 (Utilization field in industry) The present invention relates to the bicycle wheel valley. In more detail, instead of using the hook hole for inserting the spokes formed by the three continuous holes formed on the collar of the hub, instead of using the insertion hole of one hole, the assembly The wheel valley of a structure that prevents the spokes from interfering with it. (Prior art) Wheels for bicycles, which have the ability to withstand the static load and dynamic load of the wheels, and give the wheels a light and smooth rotation function, and the spokes are generally radial wheels that connect the wheels. The linear part of the rim (steel ring) part and the central hub part. The spoke is composed of a hook portion hooked to the spoke hole of the wheel valley collar at one end, and a spoke line formed with a thread portion at the other end, and the spoke hole inserted into the rim is fitted to the screw portion of the spoke line and It is composed of a take-over tube that is tightened and adjusted to be fixed. The axle ring of the wheel body is provided with a spoke hole for inserting and holding the spoke. There are two types of spoke holes: an insertion hole (_hole) made of one hole and a hook hole formed of three consecutive holes. The hook hole has the advantage that the spoke can be replaced in the assembled state without disassembling the drum wheel or multi-stage flywheel. However, when the rim is bent due to excessive riding or impact, the hook portion of the spoke has a hook hole Worry. The hooking hole is at the time of assembly. Although the spokes are inserted, it may happen that the hooking part of the spokes detaches from the hole at the center of the spokes. There is an operation to remove this congestion, so as far as possible not to use this hook hole as the paper standard. Use the Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the precautions on the back before filling in this Page). Binding · Order 293802 A7 _____B7_ Fifth, the description of invention (2) is appropriate. Therefore, it is most ideal to use a hook hole without removing the drum or multi-segment flywheel in the assembled state. (Problems to be Solved by the Invention) The present invention was invented with the above-mentioned technical background, and can achieve the following objects. The object of the present invention is to provide a bicycle hub which is provided with a through hole provided in the wheel valley body and still formed with a through hole, so that the spokes will not interfere with the assembly. Another object of the present invention is to provide a wheel valley for bicycles that can save labor in assembling wheels. (Means for Solving the Problems) The present invention adopts the following measures to achieve the above problems. That is, the present invention is: mainly printed by: Beigong Consumer Cooperative of the Central Bureau of Samples of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page), the wheel valley shaft inserted through the center of wheel valley; and bearing And the wheel rotatably supported on the outer circumference of the wheel shaft is arranged in parallel, and is equipped with two collars with slightly rounded spoke insertion holes and a wheel valley formed by a tube connecting the two collars: And the wheel for bicycles with freely rotating wheels composed of a piece of sprocket and transmitting one-way rotational force to the above-mentioned wheel body, it is provided that when the wheel is to be assembled, the spokes are inserted into the above-mentioned sprocket side Spoke insertion hole #, in order to allow the insertion without disassembling the above-mentioned sprocket, the bottom of the tooth of the above-mentioned sprocket is set at half of the above-mentioned sprocket. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297mm) A7 _B7___ printed by Beigong Consumer Cooperative of Central Bureau of Standards of the Ministry of Economic Affairs V. Description of the invention (3) Radial cut-out opening for spoke insertion. (Embodiment of the invention) Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view of a bicycle wheel hub according to an embodiment of the present invention. The present invention is applied to the embodiment called "wheel valley with free-running small sprocket unit". The wheel valley shaft 2 with male threads formed at both ends is arranged through the center of the wheel valley 1 with the free-spinning small sprocket unit, and is arranged at intervals at the outer periphery of the center of the wheel valley shaft 2有 管 3。 There are tubes 3. At both ends of the tube 3, collars 4 and 5 are integrally fixed, and the tube 3 and the collars 4 and 5 constitute a wheel valley body 6. The interior of the wheel body 6 of the first embodiment is a conventional structure that has been standardized, and therefore its description is omitted. The side of the collar 5 is provided with a freely rotating small sprocket 7. A cylindrical portion 8 is integrally formed on the freely rotating sprocket 7. The cylindrical portion 8 has a bearing made of conventional steel balls, a free-wheel (flywheel) mechanism, and the like. The Free Wheel mechanism has the function of transmitting the rotation force of the chain in one direction only. One-way clutches such as ratchet mechanisms are available. The mechanism used in the first embodiment is conventionally known and has been standardized, so the description of its structure is omitted. The free-running pinion gear 7 is fixed by a screw cap 9. The hub body 6 is rotatably supported by the wheel valley 2 by steel balls (not shown) constituting the bearing. The steel balls are held by being pushed by the steel ball pallets 10, 1 1. The steel ball pallets 1 0, 1 1 are fixed to the wheel valley shaft 2 with fixing nuts 1 2, 1 3. The collars 4 and 5 are provided with insertion holes at equal angles on the outer circumference (the paper size of the round hole is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the precautions on the back and fill in this page ). Packing. Order A7 293802 _____B7__ V. Description of the invention (4)) 1 4 »1 5 ° Insertion hole (round hole) 1 4, 1 5 is a hole penetrating through the center of the collar 4, 5 and two A hole where the end is flattened. In this embodiment, 18 through holes (round holes) 1 4, 15 are arranged at equal angular positions on the outer circumference of the collars 4, 5 respectively. The sprocket 16 of the free-running small sprocket 7 is different from the shape of the user. Fig. 2 is a right side view of Fig. 1. Fig. 3 is an enlarged view of the tooth shape of the sprocket 16. In the first embodiment, the sprocket (sprocket) 16 has 14 teeth. The sprocket 16 has spoke openings 20 formed in the tooth base 21 at intervals of an angle of 120 degrees. The tooth base 2 1 without forming the spoke insertion opening 20 is formed by the curved surface 2 2 of radius r :. The curved surface 2 2 is in contact with the tooth bottom circle R2. Successively formed on the curved surface 2 2 is a tooth surface 23 having a radius r2 to form a tooth tip 24. The tooth tip 24 is in contact with the tooth tip circle Ri. The opening 20 for the spoke insertion, that is, the plane 26 is formed continuously to the tooth surface 23, and the intersection line 25 is formed at this level. Successively on the plane 26, a circular arc surface 2 7 with a radius r3 is formed, and the plane 26 forms the junction of the circular arc surface 2 7. The arc 27 is then connected to the open tooth bottom circle R3. Similarly, a plane 2 6 is formed continuously on the arc surface 2 7, the intersection line 25, and the tooth surface 23 and the plane 26 form an angle with the radial direction. The sprocket wheel 16 has three openings for the spoke insertion 20. The space where the difference h between the tooth bottom circle R2 and the open tooth bottom circle R3 is cut off. The interval (width) of the opening 20 for spoke insertion, that is, if there is no diameter larger than the hook portion 31 of the spoke 30 (see FIG. 4), the hook portion 3 1 cannot be passed as described later. This paper uses the Chinese National Standard (CNS) A4 (21〇X297mm) (please read the precautions on the back and then fill out this page). Packing. Ordered by the Ministry of Economic Affairs, Central Government Staff Consumer Cooperatives to print the economy A7 ____B7 Printed by the Ministry of Standards and Staff's Consumer Cooperatives V. Description of the invention (5) Assembly method The following describes the method of assembling the spokes 30 on the wheel valley 1 with the freely rotating small chain gear unit. Fig. 4 is a cross-sectional view of a part of the spoke 4 inserted into the collar 4 from the outside. There are various conventional methods for assembling the tangential spoke wheels. However, it is usually inserted from the threaded portion 3 2 of the spoke 30 by the left and right of the collar 4 (from both sides of the plate thickness) alternately, and the hook portion 3 1 is fixed to the insertion hole 14 ° from the collar 4 When the spoke 30 is inserted in the left-right direction, there is no member that constitutes interference, so there is no problem. However, when the spoke 30 is to be inserted from the right direction of the collar 5 (above the illustration), that is, through the tooth base 21 of the sprocket 7 and inserted into the insertion hole 14 of the shaft 5, the tooth base 21 will interfere The spokes cannot be inserted. That is, when the front end of the spoke 30 contacts the outer peripheral surface of the collar 4 and the insertion hole 14, the angle formed by the center line of the wheel valley shaft 2 and the center line of the spoke 30 is < 9. In other words, the diameter d of the spoke 30 and the insertion hole 14 have a gap due to the difference in diameter, so in fact, the maximum radius on the inner circumferential surface of the insertion hole 14 and from the center of the wheel kill shaft 2 The position of R5 and the outer peripheral surface of the spoke 30 will be in contact with the insertion hole 14. Therefore, the angle Θ is determined by the distance between the collar 4 and the collar 5, the radius R4 of the outer circumference of the collar 4 and the radius R5 of the insertion hole 14 of the collar 5 This paper standard is applicable to the Chinese National Standard (CNS) A4 specification ( 210X297mm) I--nn ϋ n J. ^ nnnn IT ni I nn IKH $ ((Please read the precautions on the back before filling out this page) A 7 B7 Printed by the Ministry of Economic Affairs Central Falcon Bureau Beigong Consumer Cooperative Printed 5 3. The description of the invention (6) is determined by the system. When the distance between the collar 5 and the sprocket 7 is H2, there is approximately the following relationship to prevent the spokes 30 from interfering with the sprocket. R3 ^ (R4 -(Hi + H2) * tan ^) t an ^ = (R4 — (R5 — d) J / Hi R4 is the outer radius of the collar, R5 is the maximum of the inner circumference of the above insertion hole 14 of the collar 5 Radius, Hi is the interval between the collar 4 and the collar 5, H2 is the axial distance between the collar 5 and the hub shaft of the sprocket 7. The above relationship is applicable to the bicycle wheel structured in the above embodiment The valley is not necessarily suitable for other bicycle wheel valleys of different structures. In practice, the smallest diameter of the diameter d of the spokes 30 currently used is straight It is 1.6 mm, so it is appropriate to form a spoke insertion opening 30 that can be inserted into a spoke with a diameter of at least 1.6 mm or more. The spoke insertion opening 20 should have a size of about 2 times (about twice the radius r3). The diameter d is 1.6 mm or more, preferably larger than the diameter of the fishing hook of the spoke 30. As detailed above, the spoke 3 can be worn through the opening for spoke insertion 2 without interfering with the sprocket 7. Inserted into the through hole of the collar 5 The paper size is applicable to China National Standard (CNS) A4 specification (210X 297mm) (Please read the precautions on the back before filling this page)
L -β Γ A7 B7 293802 五、發明説明（7 ) (其他實施形態） (請先閲讀背面之注意事項再填寫本頁) 上述發明之實施形態係以不扳彎輪輻3 0地實施裝配 爲例，惟輪輻3 0乃由鋼，不銹鋼等之彈性材料所製者， 因此在不會發生彈性變形之範圍內即可能插入於插通孔 1 4。此時上述輪輻插入開口 2 0之齒底圓之半徑R3即 較鏈輪1 6之齒底圓之半徑1^2小之値即可。此時雖比較 不易將輪輻3 0插入於插通孔1 4，惟少微使輪輻3 0彈 性變形就可以裝配，因此比不形成輪輻插入用開口 2 0者 更容易裝配。 上述實施形態之輪輻插入用開口 2 0係設於三處爲例 ，惟由上述實施例可知，祗設於最少一處亦可。又上述實 施形態係適用於具有自由輪小鏈齒輪單元之輪穀爲例，但 亦可適用於多段小鏈齒輪型之習知之各種型式上之輪穀也 (發明之效果） 經濟部中央梂準局貝工消费合作社印製 如上所詳述，本發明之自行車用輪毅由於設置了輪輻 插入用開口，因此可以不拆下剎車用帶鼓輪或自由轉輪等 等會干涉之構件下以裝配狀態下可完成輪輻之裝配，更換 之效果。 圚式之簡單說明 第1圖係本發明資施形態1之自行車用輪穀之正面圖 本紙張尺度適用t國國家標準（CNS )八4規格（210X297公釐） -10 - A7 B7 五、發明説明（8 ) 〇 第2圖係第1圖之右側面圖。 第3圖係鏈輪之齒形之擴大圖。 第4圖係從外側插入輪輻於軸環時之一部份斷面圖。 (請先閲讀背面之注意事項再填寫本頁) 一__ 訂 經濟部中央標準局貝工消费合作社印製 本紙張尺度適用中國國家搮準（CNS ) A4規格（210><297公釐） -11 -L -β Γ A7 B7 293802 V. Description of the invention (7) (Other embodiments) (Please read the precautions on the back before filling in this page) The above-mentioned embodiments of the invention take the assembly without turning the spokes 30 as an example However, the spokes 30 are made of elastic materials such as steel and stainless steel, so they can be inserted into the insertion holes 14 within the range where no elastic deformation occurs. At this time, the radius R3 of the tooth base circle of the above-mentioned spoke insertion opening 20 may be smaller than the radius 1 ^ 2 of the tooth base circle of the sprocket 16. Although it is relatively difficult to insert the spoke 30 into the insertion hole 14 at this time, it can be assembled with little elastic deformation of the spoke 30, so it is easier to assemble than if the spoke insertion opening 20 is not formed. The openings 20 for the spoke insertion in the above embodiment are provided at three places as an example. However, it can be seen from the above embodiments that it may be provided at at least one place. In addition, the above embodiment is applied to the wheel valley with a free-wheel small chain gear unit as an example, but it can also be applied to various types of wheel valleys of the conventional multi-stage small chain gear type. (Effect of the invention) Central Ministry of Economic Affairs Printed by the Bureau Cooperative Consumer Cooperative as detailed above, the bicycle wheel of the present invention is provided with a spoke insertion opening, so it can be assembled without removing the components that interfere with the brake belt drum or free wheel It can complete the assembly and replacement of the spokes under the condition. Brief description of the formula 1 Figure 1 is a front view of the bicycle wheel valley of the present invention in the form of application 1. The paper size is applicable to the national standard (CNS) 84 specifications (210X297 mm) -10-A7 B7 5. Invention Description (8) 〇 Figure 2 is the right side view of Figure 1. Figure 3 is an enlarged view of the tooth profile of the sprocket. Figure 4 is a partial cross-sectional view when the spoke is inserted into the collar from the outside. (Please read the precautions on the back and then fill out this page) 1. The paper size printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs is applicable to the Chinese National Standard (CNS) A4 (210 > < 297mm) -11-