1279350 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種腳踏車之擋泥板，尤其是關於裝設 於競赛用腳踏車之擋泥板。 【先前技術】 腳踏車行走中，為了防止道路上的泥巴或水滴等飛濺 至騎士及車體上，而裝設有擂泥板以覆蓋前輪及後輪的上 方。 一般實用車中，擋泥板係為剖面大致呈圓弧狀以配合 車輪直徑及寬度的薄板，並可藉著擋泥板支架及安裝組件 女裝於本體框架。 如第4圖所示，裝設於前輪的前擋泥板（3)係藉著前擋 泥板安裝組件（33)而安裝於前叉架（30)的叉架肩部（31)附 近’同時藉由前擋泥板支架（32)安裝於上述前輪的輪軸。 此外，裝設於後輪的後擋泥板（4)係可藉著後擋泥板安裝組 件（43)安裝於鞍座柱（40)的座墊支架（41)，同時藉著後撞 泥板支架（42)安裝於上述後輪的輪轴（44)。 又，裝設於競赛用腳踏車的擋泥板大多係朝大致水平 方向覆蓋車輪上方的遮簷狀，且僅藉著安裝也件_裝於本 體框架。尤其是競赛用腳踏車之擋泥板，為了防止泥巴濺 到臉上，設置於前輪的前擋泥板即特別重要再者，撞泥 板亦要求需具有巧妙的硬度、強度、柔軟度及重量等。 例如··以安裝組件固定於本體框架的部分（以下，稱為 基部。）必須具有足夠的剛性，但是以剛性強的材質構成播 1279350 泥板整體時，會產生前端側的遮簷部（以下稱為延伸部）容 易因外力的衝擊而斷裂或彎折的問題。反之，以軟性材質 構成整體時，即可柔軟地因對衝擊而不會斷裂或彎折，但 疋右上述基部過於柔軟，固定於框架時則會產生障礙。若 提高整體強度以解決所有問題的程度，則延伸部會產生強 度過剩，而造成擋泥板整體重量增加。 為了解決上述問題點，於專利文獻2之發明中揭示有 一種擋泥板，其係由剛性強的硬質構件形成基部，且由可 變形自如的軟質構件形成延伸部，然後，藉由一體成型將 兩者結合而形成者。 —本發明的構造中，不僅基部得以確實地固定於上述本 體犯架，且由軟質性構件形成的上述延伸部亦得以變形自 ，，同日夺兼具復原性，而且即使外力衝擊作用於上述延伸 部，亦可透過延伸部本身的變形及復職，防止撞泥板整 體的破損，並可發揮所期望的擋泥作用。 【專利文獻1】 曰本特開平8 — 104275號公報 【專利文獻2】 曰本特開平8 — 216950號公報 【發明内容】 (發明所欲解決之課題） 然而’上述專利文獻2的發明中，高剛性的基部以及 柔軟且可變形自如的延伸部係藉由嵌人成型方式一體構 成’所以在選擇基部及延伸部的構成材料時，必須選擇彼 !279350 此相容性佳的組合。 若將基部與延伸部分開構成時，即不需受限於材料， 而可選擇分別適合基部及延伸部的構成材料，然而依據上 述延伸部接合於上述基部的方法，則上述延伸部容^因行 走中的振動而產生晃動，而前擋泥板於行走中晃動的情$ 進入視野時，又會產生注意力無法集中於競賽的問題。y _ 又，該公報中，就使基部與延伸部固接的其他方法而 言’、還揭示有黏接、螺緊、溶接等方法，但是儘管有這些 己載卻未斯*使人明瞭其基部與延伸部是否分開構成，上 述延伸部是否得以防止行走中晃動的狀態連接於基部。 本發明係『由：固定於本體框架的基部；以及從上述 基。P的-端或兩端’朝覆蓋車輪上方之方向延伸的延伸部 所，成』的腳踏車檔泥板，其特徵係：得以確實且穩定的 固^基部’同時分別利用最適當的材料構成基部及延 十傲於外力衝擊施加於上述延伸部時，亦得以防止斷裂 i變形等破損， ·而且，可個別且自由地選擇構成材料，再 基部μ延伸部得以在防止行走_晃動的狀態接合於上述 (用以解決課題之手段） 美立iw/1)中明專利1請第1項之腳踏車的播泥板中，上: 的材料所構成，而上述延仲部係由輕量』 質性材料所構成，且兩者係分開構成， 且h上^基部及上述延伸耗分卿成具有上面與兩細 且朝下敵開的剖面形狀，同時在上述上面及上述兩側面木 1279350 互豐合的狀態下得以將各面相互接合。 上述技術手段具有如次的作用。 將基部安裝於本體框架。由於上述基部係由高剛性材 料所構成，所以安裝於本體框架時具有充分的強度。並且， 可依據需要將延伸部接合於上述基部之前後端部的兩邊或 一邊。上述基部及延伸部係形成例如剖面大致口字型或剖 面大致倒U字型之朝下敞開剖面形狀，並且由於係在上面 及兩側面相互疊合的狀態下將各面相互結合而構成，所以 基部與延伸部可於上面及兩側面之至少3個部位接合。藉 此結構，雖然上述延伸部係由輕量軟質性材料所構成，但 疋接於基部的基端部乃具有可呈現上述基部剛性的強 度，且前端部可呈現軟質性，而得以柔軟地因應外力的衝 擊。 (2) 申請專利範圍第2項之腳踏車的擋泥板中，上述延 伸部係裝卸自如地接合於上述基部，故使用者可按照需 要’當場進行延伸部對於上述基部的裝卸作業。 (3) 申請專利範圍第3項之腳踏車的擋泥板中，上述延 伸。卩係设定成可在疊合於上述基部之一端或兩端的狀態下 滑動於前後方向，且得以在上述基部至上述延伸部之長度 調整為所期望長度的狀態下進行接合，各可將令延伸部自 基。卩的端部疊合，同時藉由將該疊合部位設成預定的長度 而將兩者接合，俾將擋泥板整體長度調整成所期望的長度。 (4) 申請專利範圍第4項或第5項之腳踏車的擋泥板， 係於上述基部與上述延伸部的上面及兩侧面相互疊合部 1279350 位’分別形成有貫穿兩者的貫穿孔，並將固定具插入於上 述貫穿孔，以將上述疊合部位固定於防止錯開狀態，而上 述貫穿孔係在上述基部與上述延伸部中之任一邊形成有一 個，在另一邊則沿著前後方向的一直線上形成有複數個。 例如··沿著延伸部的長度方向形成有複數貫穿孔時，若令 上述延伸部上最靠近基部一端附近的貫穿孔對應於上述基 部所形成的一個貫穿孔，則可將從上述基部突出的延伸部 長度設成最長。反之，若令上述延伸部上最靠近另一端的 貝穿孔疊合於基部的貫穿孔時，則可提供從基部突出的延 伸部長度設成最短的擋泥板。 (5)本發明㈣專利範圍第6或7項之腳踏車的播泥板 中’於上述基部與上述延伸部之上面及兩側面相互疊合部 位中之任—邊，形成有強制嵌人式突起，而在上述疊合部 位之另-邊，則㈣後方向的―直線上形成可㈣入上述 突起的複數穿孔，其中’故可令基部與延伸部部分地疊合， 使穿孔位於突起的突出方向，藉由在所期望位置上的穿孔 強制嵌入上述突起，即得以使兩者接合。又，藉由使基部 與延伸部強制分離’即可解除上述突起對於上述穿孔的嵌 入狀態。 (發明的效果） 依據上述構成，本發明具有如次的特殊效果。 因為基部係由高剛性材料所構成，所以本體框架對 上述基部的裝設強度較大，而不鼠㈣ 固定。 而^在確實且敎的狀態 1279350 因為上述延伸部係由輕量軟質材料所構成，所以可防 止外力衝擊而造成延伸部斷裂、彎折等破損的情形，同時 整體上不會產生強度過剩或重量過重，而在基端部中，藉 由與具有剛性的上述基部之上面及兩側面相互疊接，而^ 以呈現上述基部的剛性，使上述延伸度的基端部具有充= 的強度。因此，可抑制行走中的震動或風壓等造成上述= 伸部晃動。 由於分開構成的基部及延伸部係以可裝卸自如方式接 合，所以選擇基部及延伸部的構成材料時，於嵌入成型的 情況下，不需選擇彼此相容性佳的組成。因此，可選擇分 別適合基部及延伸部的材料，而不會相互限制。 又，根據申請專利範圍第2項的發明，由於延伸部係 以可裝卸自如方式接合於基部，所以競赛者可依據當天的 天氣等競赛條件，當場進行延伸部的裝卸。例如··在雨天 或或越野競赛等需要擋泥板時，可將延伸部接合於基部來 使用，而在晴天等不需要擋泥板時，可將延伸部從基部卸 下，形成不具有擋泥板的腳踏車。 根據申請專利範圍第3項的發明，因為可將擋泥板整 體長度調整為所期望的長度，故可提供一種得按競賽者的 喜好或競賽條件而構成最適當長度的擋泥板。 根據申請專利範圍第4至7項的發明，可提供一種延 長部對於基部的長度調整得以容易進行，且可按競赛者的 喜好或競賽條件而構成最適當長度的擋泥板。 10 1279350 【實施方式】 以下參考附圖說明本發明最佳實施型態。 第1圖係本發明第1實施型態之腳踏車擋泥板的部分 省略分解斜視圖，其中，顯示覆蓋前輪前側上方的前播泥 板⑴。 前擔泥板（1)係由基部（10)及延伸部（H)所構成，基部 (10)係得以藉安裝組件（2)安裝於前叉架（3〇)，且可直接安 裝於上述安裝組件（2)。延伸部（u)則與上述基部（1〇)分開 形成，並得以安裝於上述基部（10)，且沿伸於水平方向而 當作遮簷部發揮作用。 基部（10)及延伸部（11)分別由上面（1 〇a) ( 1 la)以及連 接於其兩侧邊的兩側面（l〇b)(lib)形成朝下敞開而大致呈 口子型的剖面’並且上述基部（1 0 )係由尼龍或碳纖維混合 尼龍的射出成型品所構成，而具有高度的剛性。延伸部（J i) 係由聚乙烯對苯二甲酸酯或聚碳酸酯的薄板成形品所構 成。 在基部（10)的上面（1 〇a)上，前後並列地形成一對穿孔 (13)(14) ’同時在上面（l〇a)及兩側面（i〇b)的前端附近， 分別形成有穿孔（15)(16)。又，在延伸部（11)之上面（iia) 及兩側面（lib)之基端部附近的預定位置，形成有對應於上 述穿孔（15)(16)之穿孔（17)(18)。 欲將上述前擋泥板（1)安裝於腳踏車框架的前又架（3〇) 時，必須先將安裝組件（2)安裝於前擋泥板〇)岛叉架肩部 (31) 〇 11 1279350 上述安裝組件（2)係由鋼或不銹鋼製的矩形板體於預 定位置彎折而構成者，其構造包括：裝設於上述叉架肩部 (31)下面的基板（21)，·從上述基板（21)前後兩端豎起的直 立板（22a)(22b);以及從上述直立板（22a)(22b)上端再朝 前後方向突出的支持板（2〇&)(2〇13)。上述直立板（223)(2213) 間的距離係設成與上述叉架肩部（31)的前後方向寬度大約 一致’同時上述直立板（22a)(22b)的高度係設成與上述叉 架肩部（31)的高度大約一致。此外，在上述基板（21)的中 央部形成有一個穿孔（21a)，同時在上述支持板（2〇a) (2〇b) 上，以前後並列之方式各形成有兩個螺絲孔（23)(24)。 在上述前叉架（30)的叉架肩部（31)上，以連通於筒狀 叉架支桿（34)下方的方式形成有朝下敞開的筒孔（35)，且 如第2圖所示，在由筒身體斜切而構成之由一對第1、第2 同體（51)(52)所構成的固定部（5)係插入於上述筒孔（35) 内。 在位於上方之第1筒體（51)的上面設有螺帽部（50)， 同時上述第l·、第2筒體（51)(52)的外徑大小係設定成恰好 可插入上述筒孔（35)内。 使用此等固定構件（5)及安裝組件（2)，將基部（1〇)安 裝於前叉架（30)時，首先，於第1、第2筒體（51) (52)之斜 切面相互吻合的狀態，將固定構件（5)載置於安裝組件（2) 的基板（21),接著，令鎖緊螺栓（25)從基板（21)下方，穿 過第1、第2筒體（51)(52)的筒孔，而螺合於螺帽（5〇)，以 此方式，即可藉由螺栓（25)使安裝組件（2)與固定構件（5) 12 1279350 形成一體結合。 然後’按安裝組件（2)的支持板（20a)向前方突出，支 持板（20b)向後方突出的方向，將固定構件（5)從又架肩部 (31)的下方插入於筒孔（35)内，直到基板（21)抵接叉架肩 部（31)的下端為止。插入後，再鎖緊上述鎖緊螺栓（25)。 螺帽（50)與第1筒體（51)藉鎖緊螺栓（25)的鎖緊而同時向 下移動，使第1筒體（51)的向下斜面推壓第2筒體（52)的 向上斜面。因此，第1、第2筒體（51)(52)會分別朝第2圖 的箭號方向移動，而一邊推壓筒孔（35)的内面，同時牢固 地固定於上述筒孔（35)内。 精由利用固定構件（5 )，可使安裝組件（2 )藉著鎖緊螺 栓（25)固定於叉架肩部（31)的下面而呈防脫狀態，且在突 出於上述安裝組件（2)前方的支持板（2〇a)上載置上述基部 (10)，同時令設置於上面（l〇a)的一對穿孔（13)(14)對準設 置於支持板（20a)的螺絲孔（23)(24)，並利用螺栓（19)螺緊 於上述螺絲孔（23)(24)，並將上述基部（1〇)加以固定。 將上述基部（10)固定於安裝組件（2)的支持板（2〇a) 後’將延伸部（11)的基端部插入在基部（丨〇)前端坪分的下 方。使形成於延伸部（11)穿孔（17)(18)與形成於^部（10) 的穿孔（15 )(16 )相互對應’將固定銷（12 )插通其間而固定 兩者。並且，就固定銷（12)而言，可採用第1圖所示之由 筒狀的前裂銷（12a)及插入銷（12b)組成的構造，而該插入 鎖（12b)係插入上述筒狀前裂鎖（i2a)内，以擴張上述筒狀 前裂銷（12a)前端部分的直徑。 13 1279350 透過固定銷（12)連成固定作用的部位共有基部（IQ)與 延伸部（11)的上面（10a)(11a)及兩側面（i〇b)(lib)等三個 部位，所以延伸部（11)可確實地安裝於基部（1〇)，不會因 風壓或振動等而產生晃動。因為固定銷（12)係由前裂銷 (12a)及插入銷（12b)組合形成者，故不需使用工具等即得 以容易地裝卸。因此，透過固定銷（12)的裝卸，使延伸部 (11)亦得以容易地裝卸於基部（1〇)。亦即，在雨天或越野 競賽的情況下，欲防止行走中車輪造成泥水飛濺或小石子 彈起而打到騎士的臉上時，即可將延伸部（u)裝設於基部 (10) ’此外，晴天不需擋泥板時，若將延伸部（11)從基部 (10)卸下，即可變成未設擋泥板的腳踏車，競赛者得以當 場輕易進行此種的樣式變更。 並且’延伸部（11)的長度係設定成占前擋泥板（1)整體 長度的一半以上。因此，具備延伸部（11)的情況與不具備 延伸部（11)的情況，其差異甚易明瞭，在前者的情況中， 撐泥板的功能得以確實地發揮，在後者的情況中，沒有作 用的。P为擔泥板（基部）並不會造成行走時的妨礙。 第3圖係表示裝設有本發明第2實施型態之前擋泥板 的狀態。 與上述第1實施型態同樣的，基部（10)係藉著螺栓（19) 而螺緊於安裝在叉架支桿（34)之叉架肩部（31)上之安裝組 件（2)的支持板（2〇a)，然而本實施型態中，係將補助片（ι〇〇) 從上述基部（1〇)的前端一體延伸形成於水平方向，同時在 上述補助片（100)上可裝卸自如地接合上述延伸部（11)。 14 1279350 補助片（100)係與上述基部（10)同樣，形成有朝下敞開 之大致呈口字形剖面，同時在其上面及兩側面的前端附 近’分別突設有一個前端呈圓錐狀的突起（26)。又，在延 伸部（11)上面（11 a)及兩側面（11 b)沿著延伸部（丨丨）的軸 線’形成有複數個可供強制嵌入上述突起（26)的穿孔 (27)(28)。 此結構中’在沒有裝設延伸部（Η )的狀態下，係形成 具備補助片（100)之基部（1〇)固定於叉架支桿（34)上的形 態，而需要延伸部（11)時，只要在上述補助片（1〇〇)上安裝 延伸部（11)即可。此時，令突起（26)強制嵌入於並列在延 伸部（11)前後方向上之複數穿孔（27)(28)的任一個，即得 以設定前擋泥板（1)整體的長度。 例如：如該圖的實線所示，令突起（26)分別嵌入於位 在延伸部（11)最基端部側（補助片（1〇〇)側）的穿孔（27)(28) 時’可提供整體長度最大的前擋泥板（1)，並且，如該圖的 兩點鏈線所示，令突起（26)嵌入位於最前端侧的穿孔 (27)(28)時，則可提供整體長度最短的前擋泥板（1)。 因此，可依據突起（26)嵌入穿孔（27) (28)的位置，來 變更前擋泥板（1)的整體長度，所以競赛者可依據參夫的天 氣等競赛條件或自己的喜好，當場將擋泥板調整成所期望 的長度。 並且’如上述第1實施型態的基部（10)與延伸部（11) 那樣，令設於該兩者的穿孔對準且藉著固定銷（12)固定的 構造中，於上述基部（1〇)上設置向前方延伸的補助片 15 1279350 (100)，且將複數供固定銷（12)穿通用的穿孔朝前後方向並 列設置於上述補助片（100)或延伸部（11)上時，即與上述第 2實施型態的構造同樣，可藉由令固定銷（12)穿通上述並列 之複數穿孔中的任一個，來調整前擋泥板（1)的整體長度。 上述各實施型態的構造，係僅就設置於前輪上方的前 播泥板中，設置於偏叉架支桿（34)前方的前擋泥板（1)予以 詳細說明’然而亦可利用安裝組件（2)的支持板（20b)而設 置於偏又架支桿（34)的後方。此外，裝設於腳踏車後輪的 擔泥板當然亦可同樣地由基部與延伸部所構成，而且上述 _ 延伸部亦可裝卸自如地設置於基部。 16 l279350 【圖式簡單說明】 第1圖係本發明第1實施型態之腳踏車擋泥板的部分 省略分解斜視圖。 第2圖係表示將本發明第1實施型態之腳踏車擋泥板 的安裝組件（2)安裝於前叉架（30)之方式例的重要部位放 大剖視圖。 第3圖係本發明第2實施型態之腳踏車擋泥板的重要 部位放大剖視圖。 第4圖係表示習知腳踏車擋泥板的斜視圖。 【符號說明】 (I) (3)前擋泥板 (4)後擋泥板 (II) 延伸部 (l〇b)(llb)兩侧面 (12a)前裂銷 (2)安裝組件 (10)基部 (10a) (11 a)上面 (12)固定銷 (12b)插入銷 (13)(14)(15)(16)(17)(18)(21a)(27)(28)穿孔 (19)螺栓 (21)基板 (23)(24)螺絲孔 (26)突起 (31)叉架肩部 (33)前擋泥板安裝組件 (35)筒孔 (20a)(20b)支持板 (22a)(22b)直立板 - * “，- (25)螺检I (30)前又架 (32)撞泥板支架 (34)叉架支桿 (40)鞍崖柱 (41)座墊支架 (42)後擋泥板支架 17 1279350 (43)後擋泥板安裝組件 (50)螺帽部 (52)第2筒體 (44)輪轴 (51)第1筒體 181279350 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fender for a bicycle, and more particularly to a fender for a bicycle for racing. [Prior Art] During the walking of the bicycle, in order to prevent mud or water droplets on the road from splashing onto the knight and the vehicle body, a mud slab is installed to cover the upper side of the front and rear wheels. In a general utility vehicle, the fender is a thin plate having a substantially arc-shaped cross section to match the diameter and width of the wheel, and can be worn on the body frame by a fender bracket and a mounting assembly. As shown in Fig. 4, the front fender (3) mounted on the front wheel is mounted near the fork shoulder (31) of the front fork frame (30) by the front fender mounting assembly (33). At the same time, the front fender bracket (32) is attached to the axle of the front wheel. In addition, the rear fender (4) mounted on the rear wheel can be attached to the seat cushion bracket (41) of the saddle post (40) by the rear fender mounting assembly (43), and The plate bracket (42) is mounted to the axle (44) of the rear wheel described above. Further, most of the fenders installed in the bicycle for racing cover the concealed shape above the wheel in a substantially horizontal direction, and are attached to the body frame only by the mounting member. Especially for the fenders of racing bicycles, in order to prevent mud from splashing on the face, the front fenders placed on the front wheels are particularly important. The mudboards also require ingenious hardness, strength, softness and weight. Wait. For example, the part to which the mounting component is fixed to the main body frame (hereinafter referred to as the base) must have sufficient rigidity. However, when the whole body of the 1279350 slab is made of a material having high rigidity, the concealing portion on the front end side is generated (hereinafter It is called an extension part) which is easily broken or bent by the impact of an external force. On the other hand, when the entire material is made of a soft material, it can be softly broken without being broken or bent, but the base of the right side is too soft, and when it is fixed to the frame, an obstacle is caused. If the overall strength is increased to solve all the problems, the extension will have a strong excess and the overall weight of the fender will increase. In order to solve the above problems, the invention of Patent Document 2 discloses a fender which is formed of a rigid member having a strong rigidity and which is formed of a flexible member which is deformable and freely, and then, by integral molding The combination of the two forms. - in the structure of the present invention, not only the base portion is reliably fixed to the main body frame, but also the extension portion formed of the soft member is deformed, and the same day is both resilient, and even an external force impact acts on the extension It can also prevent damage to the whole slab by the deformation and reinstatement of the extension itself, and can exert the desired mudguard effect. [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. The highly rigid base and the flexible and deformable extension are integrally formed by inlay molding. Therefore, when selecting the constituent materials of the base and the extension, it is necessary to select the combination of 279350 which is compatible. If the base portion and the extension portion are formed, that is, the constituent materials respectively suitable for the base portion and the extension portion are not limited to the material, but according to the method in which the extension portion is joined to the base portion, the extension portion is accommodated. The vibration during walking causes sway, and the situation that the front fender sways during walking into the field of vision causes a problem that attention cannot be concentrated on the competition. y _ In addition, in this publication, other methods of fixing the base and the extension are described, and methods such as bonding, screwing, and welding are also disclosed, but Whether the base portion and the extending portion are separated from each other, and whether or not the extending portion is prevented from being swayed during traveling is connected to the base portion. The present invention is "by: a base fixed to the body frame; and from the above base. The end of the P-end or both ends of the bicycle extending toward the upper direction of the wheel, which is characterized by a solid and stable base portion, which simultaneously forms the base with the most appropriate material. Further, when the external force is applied to the extending portion, the damage of the i-deformation or the like is prevented, and the constituent material can be individually and freely selected, and the base portion 51 can be joined to the walking/swaying state. The above (the means to solve the problem) Miri iw/1) Zhongming Patent 1 Please apply the material of the first step of the bicycle, the upper: the material, and the above-mentioned Yanzhong Department is made of lightweight The material is composed, and the two are separately formed, and the base portion and the extension of the upper portion have a cross-sectional shape with the upper and the second and the lower side, and at the same time, the top and the two sides of the wood 1279350 are mutually balanced. In the state of the state, the faces can be joined to each other. The above technical means have a secondary role. The base is mounted to the body frame. Since the base is composed of a highly rigid material, it has sufficient strength when mounted on the body frame. Further, the extension portion may be joined to both sides or one side of the rear end portion of the base portion as needed. The base portion and the extending portion are formed into a downwardly open cross-sectional shape having a substantially cross-sectional shape or a substantially U-shaped cross section, and are formed by combining the surfaces with each other in a state in which the upper surface and the two side surfaces are overlapped with each other. The base portion and the extension portion are engageable at at least three locations on the upper surface and the two side surfaces. According to this configuration, although the extension portion is made of a lightweight soft material, the base end portion spliced to the base portion has strength capable of exhibiting the rigidity of the base portion, and the front end portion can be soft and softly adapted. The impact of external forces. (2) In the fender of the bicycle of the second aspect of the patent application, the extension portion is detachably coupled to the base portion, so that the user can perform the attachment and detachment operation of the extension portion to the base portion as needed. (3) The above-mentioned extension is applied to the fender of the bicycle of the third application patent. The lanthanum is set so as to be slidable in the front-rear direction in a state of being overlapped with one end or both ends of the base, and is joined in a state in which the length of the base to the extension is adjusted to a desired length, and each can be extended. Department from the base. The ends of the crucible are overlapped while the two are joined by setting the overlapping portion to a predetermined length, and the overall length of the fender is adjusted to a desired length. (4) The fender of the bicycle of claim 4 or 5, wherein the base portion and the upper surface of the extension portion and the overlapping portions of the two sides are 1279350, respectively, and a through hole penetrating through the two is formed. Inserting the fixing tool into the through hole to fix the overlapping portion in a state of preventing the staggering, wherein the through hole is formed in one of the base portion and the extending portion, and the other side is along the front and rear direction There are a plurality of lines formed on the line. For example, when a plurality of through holes are formed along the longitudinal direction of the extending portion, if the through hole near the one end of the base portion of the extending portion corresponds to one through hole formed by the base portion, the protruding portion may protrude from the base portion. The length of the extension is set to be the longest. On the other hand, if the perforation of the outermost portion of the extending portion closest to the other end is superposed on the through hole of the base portion, the fender which is formed to have the shortest extension length from the base portion can be provided. (5) In the seeding board of the bicycle of the sixth aspect or the seventh aspect of the invention, the forcible projection is formed in any one of the base portion and the upper surface of the extension portion and the overlapping portions of the two side surfaces. On the other side of the overlapping portion, a plurality of perforations (4) into the protrusions are formed on the "straight line" in the rear direction, wherein "the base portion and the extension portion are partially overlapped so that the perforations are located in the protrusions. In the direction, the protrusions are forcibly embedded by the perforations at the desired position, that is, the two are joined. Further, the state in which the projections are fitted to the perforations can be released by forcibly separating the base portion from the extending portion. (Effects of the Invention) According to the above configuration, the present invention has a special effect as the second. Since the base is composed of a highly rigid material, the body frame is densely attached to the base portion, and is not fixed by the rat (4). In the state of the true and sturdy state 1279350, since the extension portion is made of a lightweight soft material, it is possible to prevent the external force from being broken and causing breakage of the extension portion, bending, and the like, and at the same time, no excessive strength or weight is generated as a whole. The base end portion is overlapped with the upper surface and the both side surfaces of the base portion having rigidity, so as to exhibit rigidity of the base portion, and the base end portion of the extension portion has a charge strength. Therefore, it is possible to suppress the vibration of the walking or the wind pressure and the like to cause the above-mentioned swaying of the extension portion. Since the base portion and the extension portion which are separately formed are detachably coupled, when the constituent materials of the base portion and the extension portion are selected, it is not necessary to select a composition having good compatibility with each other in the case of insert molding. Therefore, materials suitable for the base and the extension can be selected without being mutually limited. Further, according to the invention of claim 2, since the extension portion is detachably coupled to the base portion, the competitor can perform attachment and detachment of the extension portion on the spot in accordance with the competition conditions such as the weather of the day. For example, when a fender is required on a rainy day or a cross-country race, the extension may be joined to the base for use, and when the fender is not required on a sunny day or the like, the extension may be detached from the base to form no Fender bike. According to the invention of claim 3, since the entire length of the fender can be adjusted to a desired length, it is possible to provide a fender which is formed to have an optimum length in accordance with the competitor's preference or competition condition. According to the invention of claims 4 to 7, it is possible to provide a fender in which the length adjustment of the extension portion can be easily performed, and the optimum length can be formed in accordance with the preference of the competitor or the competition condition. 10 1279350 [Embodiment] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a partially omitted perspective view of a bicycle fender according to a first embodiment of the present invention, in which a front slab (1) covering the front side of the front wheel is displayed. The front slab (1) is composed of a base portion (10) and an extension portion (H), and the base portion (10) is attached to the front fork frame (3 〇) by the mounting assembly (2), and can be directly mounted on the above Install the component (2). The extending portion (u) is formed separately from the base portion (1), and is attached to the base portion (10), and functions as a concealing portion extending in the horizontal direction. The base portion (10) and the extension portion (11) are respectively formed by the upper surface (1 〇a) (1 la) and the two side surfaces (l〇b) (lib) connected to the two sides thereof, which are open downward and are substantially mouth-shaped. The cross section 'and the base portion (10) is composed of an injection molded article of nylon or carbon fiber mixed nylon, and has a high rigidity. The extension portion (J i) is composed of a sheet metal molded article of polyethylene terephthalate or polycarbonate. On the upper surface (1 〇a) of the base portion (10), a pair of perforations (13) (14)' are formed side by side in the vicinity of the front end (l〇a) and the front ends of the two side surfaces (i〇b), respectively. There are perforations (15) (16). Further, at a predetermined position in the vicinity of the base end portion of the upper portion (iia) and both side surfaces (lib) of the extending portion (11), perforations (17) (18) corresponding to the perforations (15) (16) are formed. To mount the front fender (1) on the front frame (3〇) of the bicycle frame, the mounting assembly (2) must first be installed on the front fender 〇) the island fork shoulder (31) 〇 11 1279350 The above-mentioned mounting assembly (2) is formed by bending a rectangular plate made of steel or stainless steel at a predetermined position, and the structure comprises: a substrate (21) installed under the shoulder (31) of the fork, An upright plate (22a) (22b) erected at the front and rear ends of the substrate (21); and a support plate (2〇&) protruding from the upper end of the upright plate (22a) (22b) in the front-rear direction (2〇13) ). The distance between the upright plates (223) (2213) is approximately the same as the width of the fork shoulder (31) in the front-rear direction, and the height of the upright plate (22a) (22b) is set to be the same as the above-mentioned fork The height of the shoulders (31) is approximately the same. Further, a through hole (21a) is formed in a central portion of the substrate (21), and two screw holes are formed in the support plate (2〇a) (2〇b) in the front and rear sides. )(twenty four). A tubular hole (35) that is open downward is formed on the fork shoulder (31) of the front fork frame (30) so as to communicate under the tubular fork support (34), and as shown in FIG. As shown in the figure, a fixing portion (5) composed of a pair of first and second bodies (51) (52) which are formed by chamfering the body of the barrel is inserted into the cylindrical hole (35). a nut portion (50) is disposed on the upper surface of the first cylindrical body (51), and the outer diameter of the first and second cylindrical bodies (51) (52) is set to be just inserted into the cylinder Inside the hole (35). When the base member (1) is attached to the front fork frame (30) by using the fixing member (5) and the mounting member (2), first, the chamfered surface of the first and second cylinders (51) (52) In a state of mutual matching, the fixing member (5) is placed on the substrate (21) of the mounting assembly (2), and then the locking bolt (25) is passed from below the substrate (21) through the first and second cylinders. (51) The hole of (52) is screwed to the nut (5〇). In this way, the mounting assembly (2) can be integrated with the fixing member (5) 12 1279350 by bolts (25). . Then, 'the support plate (20a) of the mounting assembly (2) protrudes forward, and the support plate (20b) protrudes rearward, and the fixing member (5) is inserted into the cylinder hole from below the shoulder (31) ( 35), until the substrate (21) abuts the lower end of the fork shoulder (31). After inserting, lock the above locking bolts (25). The nut (50) and the first cylinder (51) are simultaneously moved downward by the locking of the locking bolt (25), so that the downward slope of the first cylinder (51) pushes the second cylinder (52) The upward slope. Therefore, the first and second cylinders (51) (52) move toward the arrow direction of the second figure, and press the inner surface of the cylinder hole (35) while being firmly fixed to the cylinder hole (35). Inside. By using the fixing member (5), the mounting assembly (2) can be fixed to the underside of the fork shoulder (31) by the locking bolt (25) in an anti-off state, and protrudes from the above-mentioned mounting assembly (2) The front support plate (2〇a) carries the base portion (10), and the pair of through holes (13) (14) disposed on the upper surface (l〇a) are aligned with the screw holes provided in the support plate (20a) (23) (24), and screwed to the screw holes (23) (24) by bolts (19), and fix the base portion (1). After the base portion (10) is fixed to the support plate (2〇a) of the mounting assembly (2), the base end portion of the extending portion (11) is inserted below the front end of the base portion. The perforations (17) (18) formed in the extending portion (11) are mutually opposed to the through holes (15) (16) formed in the portion (10), and the fixing pin (12) is inserted therebetween to fix both. Further, as for the fixing pin (12), a configuration of a cylindrical front split pin (12a) and an insertion pin (12b) shown in Fig. 1 may be employed, and the insertion lock (12b) is inserted into the above-mentioned cylinder. In the anterior cleavage lock (i2a), the diameter of the front end portion of the cylindrical pre-crack pin (12a) is expanded. 13 1279350 The fixed part (12) is connected to the fixed part (IQ) and the upper part (10a) (11a) and the two side (i〇b) (lib) of the extension (11). The extension portion (11) can be surely attached to the base portion (1) without sloshing due to wind pressure, vibration, or the like. Since the fixing pin (12) is formed by a combination of the front split pin (12a) and the insertion pin (12b), it can be easily attached and detached without using a tool or the like. Therefore, the extension portion (11) can be easily attached and detached to the base portion (1) by the attachment and detachment of the fixing pin (12). That is, in the case of rainy or off-road competition, the extension (u) can be installed at the base (10) when it is desired to prevent mud splashing or pebbles from hitting the wheel during walking. When the fender is not needed on a sunny day, if the extension (11) is removed from the base (10), the bicycle can be turned into a bicycle without a fender, and the competitor can easily change the style on the spot. Further, the length of the extension portion (11) is set to be more than half of the entire length of the front fender (1). Therefore, the difference between the case where the extending portion (11) is provided and the case where the extending portion (11) is not provided is easily explained. In the former case, the function of the slab is reliably exhibited, and in the latter case, there is no Functioning. P is a slab (base) and does not cause obstruction during walking. Fig. 3 is a view showing a state in which a fender before the second embodiment of the present invention is mounted. Similarly to the first embodiment described above, the base portion (10) is screwed to the mounting assembly (2) mounted on the fork shoulder portion (31) of the fork support rod (34) by bolts (19). The support plate (2〇a). However, in the present embodiment, the auxiliary sheet (ι) is integrally formed in the horizontal direction from the front end of the base portion (1〇), and is simultaneously provided on the auxiliary sheet (100). The extension portion (11) is detachably joined. 14 1279350 The auxiliary sheet (100) is formed into a substantially cross-shaped cross section which is open downward, and has a conical projection at the front end and the front end of both sides. (26). Further, a plurality of perforations (27) for forcibly embedding the protrusions (26) are formed on the upper surface (11a) of the extension portion (11) and the two side surfaces (11b) along the axis '' of the extension portion (丨丨) ( 28). In this configuration, the base portion (1) having the auxiliary sheet (100) is fixed to the yoke stay (34) without the extension portion (Η), and the extension portion is required. In the case of the above-mentioned support sheet (1), the extension portion (11) may be attached. At this time, the projections (26) are forcibly fitted into any one of the plurality of perforations (27) (28) juxtaposed in the front-rear direction of the extension portion (11), i.e., the length of the entire front fender (1) is set. For example, as shown by the solid line in the figure, the projections (26) are respectively fitted in the perforations (27) (28) located on the most proximal end side (the side of the auxiliary sheet (1 〇〇)) of the extending portion (11). 'The front fender (1) with the largest overall length can be provided, and as shown by the two-dot chain line of the figure, when the protrusion (26) is fitted into the perforation (27) (28) on the foremost side, Provides the front fender (1) with the shortest overall length. Therefore, the overall length of the front fender (1) can be changed depending on the position at which the protrusion (26) is inserted into the perforation (27) (28), so the competitor can rely on the competition conditions such as the weather of the sergeant or his own preferences. Adjust the fender to the desired length on the spot. Further, as in the above-described first embodiment, the base portion (10) and the extending portion (11) are arranged such that the perforations of the both are aligned and fixed by the fixing pin (12), and the base portion (1)补助) is provided with a support sheet 15 1279350 (100) extending forward, and when a plurality of fixing pins (12) are provided in the front-rear direction in the front-rear direction on the auxiliary sheet (100) or the extension portion (11), That is, similarly to the structure of the second embodiment described above, the entire length of the front fender (1) can be adjusted by passing the fixing pin (12) through any of the plurality of parallel perforations. The structure of each of the above embodiments is only provided in the front seeding board disposed above the front wheel, and the front fender (1) disposed in front of the fork stand strut (34) is described in detail. The support plate (20b) of the assembly (2) is disposed behind the side support bar (34). Further, the support plate attached to the rear wheel of the bicycle may of course be constituted by the base portion and the extending portion, and the above-mentioned extension portion may be detachably provided at the base portion. [Embodiment of the Drawings] Fig. 1 is a partially omitted perspective view of a bicycle fender according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing an important part of an example in which the mounting assembly (2) of the bicycle fender according to the first embodiment of the present invention is attached to the front fork frame (30). Fig. 3 is an enlarged cross-sectional view showing an important part of a bicycle fender according to a second embodiment of the present invention. Figure 4 is a perspective view showing a conventional bicycle fender. [Description of Symbols] (I) (3) Front fender (4) Rear fender (II) Extension (l〇b) (llb) Both sides (12a) Front split pin (2) Mounting assembly (10) Base (10a) (11 a) upper (12) fixing pin (12b) insertion pin (13) (14) (15) (16) (17) (18) (21a) (27) (28) perforation (19) Bolt (21) base plate (23) (24) screw hole (26) protrusion (31) fork shoulder (33) front fender mounting assembly (35) barrel hole (20a) (20b) support plate (22a) ( 22b) Upright board - * ", - (25) screw inspection I (30) front frame (32) crashing mud bracket (34) fork support rod (40) saddle cliff column (41) cushion bracket (42) Rear fender bracket 17 1279350 (43) Rear fender mounting assembly (50) Nut portion (52) Second cylinder (44) Wheel shaft (51) First cylinder 18