1354744 .t , 「丨一…' _ 第097122065號專利申請案 - 100年7月26曰修正替換頁 六、發明說明： • 【發明所屬之技術領域】 - 本發明係有關製造性良好，且可謀求製造成本降低之 伸縮裝置及三腳架者。 【先前技術】 以往，以例如三腳架之腳部裝置等之伸縮裝置而言， 已知有一種如第12圖及第13圖所示者（參照例如非專利文 獻1)。 此第12圖及第13圖所示之伸縮裝置係具備：圓筒狀 之上側管狀體1，在下端部具有朝内邊突出之防止脫落用 内凸部la ;下侧管狀體2，沿著軸方向以可移動之方式（亦 即可上下移動之方式）插入於上側管狀體1内，且在上端部 具有朝外邊突出且於相對於上側管狀體1為最大突出時與 上側管狀體1之防止脫落用内凸部la抵接之防止脫落用外 凸部2a ;及鎖定（lock)手段等限制手段3，設於下侧管狀 體2之上端部，用以限制下側管狀體2相對於上側管狀體 1之向上移動。 再者，限制手段3係具有一對定位銷等限制體5，其 係藉由壓縮彈簧等彈推體4之彈推力而朝直徑方向外邊移 動並從孔部2b朝下側管狀體2外邊突出，且藉由與上側管 狀體1下端部之擋接，以限制下側管狀體2相對於上側管 狀體1之向上移動。 另外，上侧管狀體1及下側管狀體2均係為黃銅製， 其厚度尺寸為0. 25mm。此外，由於上侧管狀體1之防止脫 4 320308(修正版) 1354744 _ 第097122065號專利申請案 - 100年7月26曰修正替換頁 落用内凸部la以外部分之内徑尺寸，較下側管狀體2之防 ， 止脫落用外凸部2a以外部分之外徑尺寸大，因此在上侧管 - 狀體1及下侧管狀體2間具有間隙。 非專利文獻1: [online]、VELB0N股份有限公司、[2007 年 2 月 28 日檢索]、網際網路 <URL : http : //www. velbon. com/jp/catalog/classic/tlOO. html> 【發明内容】 [發明欲解決之問題] 然而’在上述習知之構成中，需於上側管狀體1之下 端部形成防止脫落用内凸部la，且於下側管狀體2之上端 部形成防止脫落用外凸部2a，因此在製造管狀體1、2方 面有花費工時之虞。 本發明係有鑑於此種問題而研創者，其目的在提供一 禮製生良好，且可謀求製造成本之降低之伸縮裝置及三 [解決問題之方案] 利圍第1項之伸縮農置係具備：第1管狀體； 第2 > -，沿著軸方向以可移動之方式插入於 :於前述第2管狀體=手段’用以限制該第3管狀體相 對、.k2. 之移動；其特徵為：前述第2管狀俨 係具有外孔部，且前述第3 々么内孔邱，二二、、 狀體係具有與刖連外孔部相 對^ , 則述限制手段係具有：藉由朝突出方向 之務動從前述内孔部突出於前述第3管狀體外之限制 320308(修正版) 5 1354744 f · I 1 ' _ 第097122065號專利申請案 - 100年7月26曰修正替換頁 體、及將該限制體朝突出方向彈推之彈推體；且前述第3 • 管狀體之内孔部若因前述伸縮裝置之伸長動作而與前述第 - 2管狀體之外孔部相對向，則前述限制體即藉由根據前述 彈推體之彈推力而朝突出方向之移動而從前述内孔部突出 並進入前述外孔部，且藉由此進入之突出狀態之限制體與 前述第2管狀體之外孔部周緣之扣合而限制前述第3管狀 體相對於前述第2管狀體之移動；在前述伸縮裝置之收縮 動作途中，若前述突出狀態之限制體與前述第1管狀體之 軸方向端部擋接，則該限制體即於藉由前述第1管狀體之 軸方向端部所產生之推壓作用而朝反突出方向移動之後， 藉由根據前述第2管狀體之外孔部周緣所產生之推壓作用 而朝反突出方向進一步之移動，從前述外孔部脫離，其中， 前述限制體係在突出方向的前端側具有限制部，該限 制部係從前述第3管狀體之内孔部全體與前述第2管狀體 之外孔部相對向之前之時點起進入前述外孔部； 前述限制部係具有抵接於前述第1管狀體之軸方向端 部且被往該第1管狀體之軸方向端部推壓的被推壓面； 於前述限制部的隨著前述第3管狀體相對於前述第2 管狀體之移動而緩緩地進入該第2管狀體之外孔部之前述 被推壓面係形成為從前端面一端橫跨到前端面另一端的傾 斜面狀且朝向外邊稍凸之彎曲面狀。 申請專利範圍第2項之三腳架之特徵為具備：基體； 及3支申請專利範圍第1至3項中任一項之伸縮裝置，以 可轉動之方式安裝於該基體。 6 320308(修正版) 13547,44 第09"7122065號專利申請案 I 100年7月26曰修正替換頁 [發明之功效] . 依據本發明，由於不需在第2管狀體形成防止脫落用 • 内凸部、又在第3管狀體形成防止脫落用外凸部，因此製 造性良好，而可謀求製造成本降低。 【實施方式】 以下參照圖式說明本發明之一實施形態。 在第3圖中，1〇係為三腳架，而此三腳架1〇係具備 基體11。在基體11係以可轉動之方式安裝有伸縮裝置12, 4伸縮裝置12係為可沿著長度方向伸縮之長形3支腳裝 置。各伸縮裝置12係為複數段式，例如為3段式，且均為 相同構成。此外，在基係、安裝有用以支標相機等之相 機座13。另夕卜’將伸縮裝置12之伸縮方向(伸長方向及收 縮方向）視為上下方向說明如下。 圚及弟。闺、珩4圃主第11圖所示，伸縮裝置 2=具備有不具防止脫落用凹凸之筒形之複數支，例如3 支管狀體…Π、18。亦即，伸縮裝置12係具備：第！ 16 ’上端部透過連結體15而以可轉動之 =基體11;第2管狀體17，沿著該第i管狀體Μ之轴方 動之方式(亦即可上下移動之方式)嵌合插入於 π之二方向而6内，及第3管狀體18，沿著該第2管狀體 方向而U可移動之方式（亦即可上下移動之 管狀體17内。在第3管狀體18之下端部‘ 女裝有屬於前端構件之腳墊19。 竹 另外，管狀體16、17、18係形成為剖面形狀整個長度 320308(修正版) 7 1354744 第〇97122〇65號專利_請索 _ 丨100年7 “曰修正;21 句相同且兩端面開口狀之細長角筒形狀，亦^^如構'^ 面形狀為四角形之正方形之薄壁狀且細長之四角筒形狀。 此外，ϊ狀體16、17、18係為铭製，其厚度尺寸之管壁厚 度為0.35mm至〇.4mra。再者，彼此鄰接之管狀體16、17、 18中之-方之管狀體16、17之内徑尺寸與另一方之管狀 ，17、18之外徑尺寸係大致相肖，且在内外彼此相鄰接之 官狀體16、17、18間幾乎無間隙。 此外，伸縮農置12係具備：作為鎖定手段等之第丨限 ，手段2卜設於第2管狀體17之上端部，用以限制第2 管狀體17相對於第1管狀體16沿著軸方向之移動（亦即上 下動），及作為鎖定手段之第2限制手段（限制手段，設 於第3管狀體18之上端部，用以限制第3管狀體18相對 於第2管狀體π沿著轴方向之移動（亦即上下動）。 在此，在第1管狀體16之下端部及第2管狀體17之 下端部，分別貫穿形成有彼此分開並相對向之矩形之一對 外孔4 23、24。在第2管狀體π之上端部及第3管狀體 18之上端部，分別貫穿形成有彼此分職㈣向之矩形之 對内孔4 25、26。外孔部23、24與内孔部25、26係為 相同形狀。再者’如第7圖等所示，在第2管狀體1?相對 於第1管狀體16為最大突出之狀態下，第2管狀體17之 上端部之内孔部25整體係與第！ f狀體16之下端部之外 孔部23整體相對向，且在第3管狀體18相對於第2管狀 體17為最大突出之狀態下，第3管狀體18之上端部之内 孔部26整體係與苐2管狀體17之下端部之外孔部％整體 320308(修正版) 8 相對向。 第〇m22065號專利申請案 10〇年7月26曰修正替換頁 定位於㈣手段^ _手段22係具有：一對 =等之限制體3卜以可在相對於 方向（伸縮梦罢^ 10 这^ 之伸縮方向）為正交之水平方向之突出 間，且將各限制趙/朝·：^:：方^_趙31 管狀二如最第大=”在第3 彈推體兩限制體31係藉由根據 體32之彈推力朝突出方向Α之移動而從第3管狀體 之内孔部26突出於第3管狀體18外並進入第2管狀體 山之外孔24 〇藉由此進入之突出狀態之限制體31之前 =4之限制部33與第2管狀體π之外孔部24周緣之扣 5 ’而限制第3管狀體㈣對於第2管狀體π之軸方向 之移動（亦即上下移動）β此時突出狀態之限制體Μ之 部係從第2管狀體17之外孔部24突出於第2管狀體17外 並露出於外部。 另一方面，如第4圖等所示，在第3管狀體18整體收 納於第2官狀體π内之狀態時，兩限制體31並未突出於 第3管狀體18外’而是位於第3管狀體18内。亦即，限 制體31之前端部係在被彈推體32彈推 之内面相接之狀態下位於第3管狀越18之内第孔部：7 此外，各限制體31係在前端側具有限制部33，在伸 縮裝置12之伸長動作時，於第3管狀體18相對於第2管 320308(修正版) 9 1354744 I · p — 1 1 第097122065號專利申請案 - 100年7月26曰修正替換頁 狀體17向下移動之際，該限制部33係從第3管狀體18之 - 内孔部26整體與第2管狀體17之外孔部24整體相對向之 • 前之時刻起隨著該第3管狀體18相對於第2管狀體17之 向下移動而緩緩地進入外孔部24。在該限制部33係形成 有隨著第3管狀體18相對於第2管狀體17之向下移動而 緩緩地進入該第2管狀體17之外孔部24之被推壓面34， 該被推壓面34係從屬於前端面一端之下端含跨至屬於前 端面另一端之上端而相對於第3管狀體18之軸方向（相對 於移動方向正交之方向）形成為傾斜面狀。亦即，限制體 31之前端面係由從上端朝向下端緩缓地朝向外邊之傾斜面 狀且朝向外邊稍凸之彎曲面狀之被推壓面34所構成。另 外，被推壓面34之上端與下端之突出方向距離L係較第2 管狀體17之厚度尺寸大（參照第10圖）。 再者，各限制體31係在基端侧具有剖面大致橫倒ϋ字 形之彈推體承受部35。在一方之限制體31之彈推體承受 部35係嵌設有彈推體32之一端部，而在另一方之限制體 31之彈推體承受部35係嵌設有彈推體32之另一端部。彈 推體承受部35係為較内孔部26大之形狀，藉由彈推體承 受部35與第3管狀體18之内孔部26周緣内面之擋接而使 限制體31無法從第3管狀體18内脫離。 另一方面，第1限制手段21係與第2限制手段22同 樣具有：一對定位銷等之限制體41，以可在相對於第2管 狀體17之軸方向為正交之水平方向之突出方向Α及反突出 方向B移動之方式彼此分開並相對向；及1個壓縮彈簧等 10 320308(修正版) 1354744 第097122065號專利申請案 100年7月26曰修正替換頁 所構成之彈推體42 ’配設在兩限制許 體41朝不同之突出方向A彈推。彈推^ ’且將各限制 較第2限制手段22之彈推體32之具# 之長度尺寸係 再者，如弟7圖等所示，在第2 管狀體16為最大之突出狀態時 _ 7相對於第1 彈推體42之彈推力而朝突出方向— 41係藉由根據 Π之内孔部25突出於第2管狀體]7 、而從第2管狀體 16之外孔部23。藉由此進入 並進入第1管狀體 端部之限制部43與第i管狀體16=、之限制體41之前 合’而限制第2管狀體17相 ：：，之扣 之移動(亦即上下移動)。 …狀體16之軸方向 納於第4®等所示’在第2管狀體Π整體收 第狀體16内之狀態時’兩限制體41並未突出於 制體外’而是位於第2管狀體17内。亦即，限 之别端部係在被彈推體42彈推而與第i管狀體16 之内:接觸之狀態下位於第2管狀體17之内孔二内。 縮農置^12’各限龍41係在前端侧具有限制部43，在伸 狀^ 16之，伸長動作時，於第2管狀體17相對於第1管 之内孔a之向下移動之際，該限制部43係從第2管狀體17 之斡之^ 25整體與第1管狀體16之外孔部23整體相對向 之向下移刻麵著該第2管狀體17相對於第1管狀體16 戍有隨緩緩地進人外孔部23。在該限制部43係形 而緩緩2皆狀體17相對於第1管狀體16之向下移動 進入該第1管狀體16之外孔部23之被推壓面 11 320308(修正版) 乐uy/i22〇65號專利甲請案 44 ^ ^4* 1A： ^ ^ ^ L·00年7月26曰修正替換頁 前二 面44係從屬於前端面一端之下端含跨到屬於 對於移動Z之上端而相對於第2管狀體17之軸方向（相 41 =向正交之方向）形成為傾斜面狀。亦即，限制體 刖^面係由從上端朝向下端緩緩地朝向外邊之傾斜面 朝向外邊稍凸之彎曲面狀之被推壓面44所構成。 “ ^外’兩限制體41係由未圖示之罩蓋體所覆蓋，且可 曰由°又於此幕蓋體之操作拉桿（lever)等操作手段之操 2 ’使被推壓面44被推壓而使限制體41朝反突出方向B =°另外’亦可為不設置罩蓋體及操作手段，而以手指 等直接按壓限制體41之被推壓面44之構成等。 拓)f各限制體41係在基端側具有剖面大致橫倒U字 山部45 °在—方之限制體41之彈推體承受 推體42之一端部，而在另-方之限制體 推體雙部45係喪設有彈推體42之另一端部。彈 3!^第2，較内孔部25大之形狀’藉由彈推體承 皆狀體17之内孔部25周緣内面之擋接而使 限制體41無法從S 2管狀體17内脫離。 接著說明上述三腳架10之作用等。 12伸=三=二°之際，在使屬於卿部裂置之伸縮裝置 離，抓住愤第4圖所示屬於收縮狀態之收納狀 Γ7從第1管狀體置 16咖 管狀體17胁*峰出’並且將第3管狀體18從第2 使第2管狀體丨”目對於第1管 動，並且使第3管狀體18相對於第 2管狀 320308(修正版) 12 1354744 • » 第097122065號專利申請案 1〇〇年7月26曰修正替換頁 17向下移動。 第5圖雖顯示]♦維 )，但在it匕伸長動^ .限制部43係稽由 置12之伸長動作途中（腳部拉長 41之限制部43係稽由殫第1限制手段21之限制體 動並進入第1管狀體16之外子之彈推而朝突出方向A移 17相對於第1管狀體P 23 ’而成為第2官狀體 態，之後，若伸縮裝 做頌疋之狀 置12成為农大伸長之狀態，則 令职也丨邡Μ π μ丄 、乐Ζ限制手段22之限制體 31之限制，M3乃藉由彈推體32 動並進入第2管狀體17之外 ^而朝犬出方向八移 9 σ| Μ ’而成為第3管狀體 18相對於¥2官狀體17被鎖定1 在此伸縮裝置12之伸長動作…第圖） 43係如第6圖所示，從第2管狀體;限制體41之限制部 之前的時點起，即 第1管狀體16之外孔部23整體相之内孔部25整體與 進入該第1管狀體16之外孔部2 ° 未正確地進人外孔部23，㈣ 因此不會有限制部43 體16内脫離之情形。而且同樣地:狀體17從第1管狀 部33係從第3管狀體18之内孔.^於限制體31之限制 Π之外孔部24整體對向之前。：整體與第2管狀體 體Π之外孔邹24，因此不會有限^即進入該第2管狀 孔部24，而使第3管狀體18從 =33未正確地進入外 形。 g狀體17内脫離之情 另方面，在使用三腳架丨〇 縮時，使用者首先在第7圖所示灸，將伸縮裝置12收 示之操作拉桿等操作手段，使限，態下，操作未圖 41朝反突出方向B移 320308(修正版) 13 1354744 _ 第097122065號專利申請案 100年7月26曰修正替換頁 動而從第1管狀體16之外孔部23脫離，而形成解除第2 • 管狀體17相對於第1管狀體16之鎖定，亦即容許第2管 - 狀體17相對於第1管狀體16之向上移動之狀態。然後， 使用者係推壓伸縮裝置12之下端部之腳墊19，並使第2 管狀體17相對於第1管狀體16向上移動。 第8圖雖顯示伸縮裝置12之收縮動作途中（腳部縮起 途中），但在此收縮動作途中，如第9圖乃至第11圖所示， 若第2限制手段22之突出狀態之限制體31與第1管狀體 16之軸方向端部16a抵接，則該限制體31即在藉由第1 管狀體16之軸方向端部16a所產生之推壓作用而朝反突出 方向B移動之後，藉由根據第2管狀體17之外孔部24周 緣所產生之推壓作用而朝反突出方向B進一步移動，而從 該第2管狀體17之外孔部24脫離，結果，解除第3管狀 體18相對於第2管狀體17之鎖定，亦即容許第3管狀體 18相對於第2管狀體17之向上移動，而使伸縮裝置12成 為第4圖所示之收納狀態。 亦即，如第9圖所示，若突出狀態之限制體31之被推 壓面34與第1管狀體16之軸方向端部16a抵接，則由於 第2管狀體17及第3管狀體18相對於第1管狀體16之向 上移動而使被推壓面34被第1管狀體16之軸方向端部16a 推壓，藉此而使限制體31抵抗彈推體32之彈推而朝反突 出方向B移動。 接下來，如第10圖所示，若第1管狀體16之轴方向 端部16a從限制體31之被推壓面34離開，則此次由於第 14 320308(修正版) 第09·7122065號專利夺請案 100年7月26曰修正替換^ 3管狀體18相對於第？其处 L卫年7月26曰修3 體W之被推壓面34被第\H17之向上移動，而使限制 厭破弟2 &狀體17之外孔部24周緣推 方向二體31抵抗彈推體32之彈推而朝反突出 狀體17之/孔部體31之限制部33從第2管 Άύ 脫離，如此一來，第3管狀體18相對 於第2管狀體17之鎖定即被解除。 2fi 依據伸縮裝置12，若第3管狀體18之内孔部 邱縮裝置12之伸長動作而與第2管狀體17之外孔 〜目對向’則限制體31就藉由根據彈推體32之彈推力 出方向A之移動，而從内孔部26朝第3管狀體18 # Ή 進入/卜孔$ 24，且藉由此進入之突出狀態之限制 營㈣ιί 2管狀體17之外孔部24周緣之扣合而限制第3 官狀體18相對於第2管狀體17之轴方向移動，另一方面， 置12之收縮動作途中’若突出狀態之限制體31 ^狀體,16之財向端部⑽抵接，則該限制體31 I7猎由第1管狀體16之軸方向端部16a所產生之推壓作 用而朝反突出方向B移動之後，#由根據第2管狀體^之 外孔部24周緣所產生之推壓作用而朝反突出方向b之進一 步移動而從外孔㈣脫離之構成，因此不需在第2管狀體 π形成防止脫落用内凸部，或在第3管狀體18形成防止 脫落用外凸部，因此不需要工匠技能等，即可容易製造管 狀體16、17、18,因此製造性良好，而可謀求製造成本之 降低，而且，即使使用鋁材作為管狀體16、17、丨8之材料 亦毫無困難，而可獲得輕巧且堅固之伸縮裝置。 320308(修正版) 15 1354744 _ 第097122065號專利申請案 100年7月26日修正替換頁 此外，由於在限制體31之限制部33係形成有隨著第 • 3管狀體18相對於第2管狀體17之移動而緩緩地進入該 - 外孔部24之被推壓面34,而該被推壓面34係從限制體31 之前端面一端含蓋到前端面另一端而形成為傾斜面狀，並 且在限制體41之限制部43係形成有隨著第2管狀體17相 對於第1管狀體16之移動而緩緩地進入該外孔部23之被 推壓面44，而該被推壓面44係從限制體41之前端面一端 含蓋到前端面另一端而形成為傾斜面狀，因此可適切防止 第3管狀體18從第2管狀體17内脫離以及第2管狀體17 從第1管狀體16内脫離。 另外，伸縮裝置12並不限定於具有3支管狀體16、 17、18之3段式者，亦可為例如2段式、或4段式以上之 構成等。 此外，雖已就使用伸縮裝置12作為三腳架10之腳部 裝置之情形說明，惟亦可適用於其他腳架（stand)裝置等。 再者，限制手段22並不限定於具有一對限制體31之 構成，亦可為例如僅具有任一單侧之限制體31之構成。 (產業上之可利用性） 本發明係可利用於例如三腳架之腳部裝置或其他腳架 裝置等。 【圖式簡單說明】 第1圖係為本發明一實施形態之伸縮裝置之部分斜視 圖。 第2圖係該伸縮裝置之部分斜視圖。 16 320308(修正版) 1^4744 第097122065號專利申請案 100年7月26曰修正替換頁 第3圖係為具備該伸縮裝置之三腳架之概略斜視圖。 第4圖係為該伸縮裝置之收縮狀態之剖面圖。 第5圖係為該伸縮裝置之伸長動作途中之剖面圖。 第6圖係為第5圖中之&部分之放大剖面圖。 第7圖係為該伸縮裝置之伸長狀態之剖面圖。 第8圖係為該伸縮裝置之收縮動作途中之剖面圖。 第9圖係為第8圖中之b部分之放大刮面圖。 第10圖係為限制體之被推壓面即將被第2管狀體之外 孔部周緣推壓瞬前之放大剖面圖。 第11圖係為限制體之被推壓面被第2管狀體之外孔部 周緣推壓而移動之狀態之放大剖面圖。 第12圖係為習知之伸縮裝置之收縮狀態之剖面圖。 第13圖係為同樣習知之伸縮裝置之伸長狀態之剖面 【主要元件符號說明】 la 防止脫落用内凸部 2a 防止脫落用外凸部 3 限制手段 10 三腳架 12 伸縮裝置 16 第1管狀體 17 第2管狀體 19 腳墊 2 2b 4 11 13 16a 18 21 上侧管狀體 下側管狀體 孔部 彈推體 基體 相機座 轴方向端部 第3管狀體 作為鎖定手段等之第1限制手段 320308(修正版) 17 1354744 _ · 第097122065號專利申請案 100年7月26日修正替換頁 22 屬於限制手段之第2限制手段 23、 24外孔部 25、26内孔部 31 限制體 32 彈推體 33 限制部 34 被推壓面 35 彈推體承受部 41 限制體 42 彈推體 43 限制部 44 被推壓面 45 彈推體承受部 A 突出方向 B 反突出方向 18 320308(修正版)1354744 .t , "丨一...' _ 097122065 Patent Application - July 26, pp. 26, Amendment and Replacement Page VI, Description of the Invention: • Technical Field of the Invention - The present invention relates to good manufacturability and can be A telescopic device and a tripod for reducing the manufacturing cost. [Prior Art] Conventionally, a telescopic device such as a leg device of a tripod has been known as shown in Figs. 12 and 13 (see, for example, Patent Document 1) The telescopic device shown in Fig. 12 and Fig. 13 includes a cylindrical upper tubular body 1 having a downwardly protruding inner convex portion 1a protruding toward the inner side at the lower end portion and a lower tubular portion The body 2 is inserted into the upper tubular body 1 in a movable manner (that is, movable up and down) along the axial direction, and has an outer edge protruding at the upper end portion and a maximum protrusion with respect to the upper tubular body 1 The outer convex portion 2a for preventing the falling of the upper convex portion 1 of the upper tubular body 1 and the restricting means 3 such as a locking means are provided at the upper end portion of the lower tubular body 2 for restricting the lower side Tubular body 2 relative to the upper side Further, the restricting means 3 has a pair of restricting members 5 such as a positioning pin which are moved outward in the diameter direction by the elastic force of the elastic body 4 such as a compression spring and are directed from the hole portion 2b toward the hole 2b. The outer side of the lower tubular body 2 protrudes and is restricted from being moved upward with respect to the upper tubular body 1 by being in contact with the lower end portion of the upper tubular body 1. In addition, the upper tubular body 1 and the lower tubular body The body 2 is made of brass and has a thickness of 0. 25 mm. In addition, due to the prevention of the upper tubular body 1 4 320308 (revision) 1354744 _ 097122065 Patent Application - July 26, pp. The inner diameter of the portion other than the inner convex portion 1a is smaller than the outer tubular body 2, and the outer diameter of the portion other than the outer protruding portion 2a is large, so that the upper tube-shaped body 1 and the lower side are There is a gap between the tubular bodies 2. Non-Patent Document 1: [online], VELB0N Co., Ltd., [Search on February 28, 2007], Internet <URL: http : //www. velbon.com/jp/ Catalog/classic/tlOO. html> [Summary of the invention] [The problem to be solved by the invention] However In the above-described conventional configuration, the inner convex portion 1a for preventing the fall-off is formed at the lower end portion of the upper tubular body 1, and the outer convex portion 2a for preventing the fall is formed at the upper end portion of the lower tubular body 2, so that the tubular body 1 is manufactured. The present invention has been developed in view of such problems. The present invention has been made in view of such problems, and the object of the present invention is to provide a telescopic device which is good in production and can reduce the manufacturing cost, and a solution for solving the problem. The telescopic agricultural system according to the first item includes: a first tubular body; a second > - movably inserted along the axial direction: the second tubular body = means 'for restricting the third tubular shape The movement of the body relative to the movement of .k2. is characterized in that the second tubular tether has an outer hole portion, and the third inner hole, the second and second, and the system has a hole opposite to the outer hole portion. The restriction means has a restriction 320308 (revision) from the inner hole portion protruding from the inner tubular portion by the movement in the protruding direction. 5 1354744 f · I 1 ' _ 097122065 Patent Application - 100 On July 26th, the revised replacement page body was revised, and the restriction body was When the inner hole portion of the third tubular body is opposed to the outer hole portion of the second tubular body by the extending operation of the expansion device, the restricting body is a restricting body that protrudes from the inner hole portion and enters the outer hole portion according to the elastic thrust of the projectile body in the protruding direction, and enters the protruding state and the outer peripheral portion of the second tubular body The movement of the third tubular body relative to the second tubular body is restricted by the engagement; and the restraining body of the protruding state is in contact with the axial end of the first tubular body during the contraction operation of the expansion/contraction device, Then, the restraining body is moved in the reverse protruding direction by the pressing action of the end portion of the first tubular body in the axial direction, and then pressed by the periphery of the hole portion other than the second tubular body. Further, the movement is further removed from the outer hole portion, and the restriction system has a restriction portion on the distal end side in the protruding direction, and the restriction portion is formed from the entire inner hole portion of the third tubular body. The outer hole portion of the second tubular body enters the outer hole portion at a position before the second tubular body; the restricting portion has an end portion in the axial direction of the first tubular body and is oriented to the axial direction of the first tubular body The pressed surface pressed by the end portion; the step of the restricting portion gradually entering the hole portion of the second tubular body as the third tubular body moves relative to the second tubular body The surface is formed into a curved surface shape that straddles from one end of the front end surface to the other end of the front end surface and is slightly convex toward the outer side. The tripod of claim 2 is characterized in that: a base body; and three telescopic devices of any one of claims 1 to 3 are rotatably mounted to the base body. 6 320308 (Revised Edition) 13547,44 Patent Application No. 09 "7122065 I. July 26, pp. Amendment Replacement Page [Effect of the Invention] According to the present invention, it is not necessary to form a second tubular body to prevent falling off. Since the inner convex portion and the third tubular body are formed with the outer convex portion for preventing the fall-off, the manufacturability is good, and the manufacturing cost can be reduced. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 3, the tripod is a tripod, and the tripod 1 has a base 11. The base 11 is rotatably attached to the telescopic device 12, and the telescopic device 12 is an elongated 3-leg device that can expand and contract in the longitudinal direction. Each of the telescopic devices 12 has a plurality of stages, for example, a three-stage type, and has the same configuration. Further, in the base system, a camera base 13 for supporting a camera or the like is mounted. Further, the expansion and contraction direction (elongation direction and contraction direction) of the telescopic device 12 will be described as the up and down direction as follows. Hey brother.闺, 珩 4圃 Main Figure 11 shows that the telescopic device 2 = has a plurality of tubular shapes that do not have a concave shape for preventing detachment, for example, three tubular bodies Π, 18. That is, the expansion and contraction device 12 is provided with: 16 'the upper end portion passes through the connecting body 15 and is rotatable = the base body 11; the second tubular body 17 is inserted and inserted along the axis of the i-th tubular body ( (that is, it can move up and down) In the direction of π, 6 and 6 , and the third tubular body 18 is movable along the direction of the second tubular body (the inside of the tubular body 17 which can move up and down. The lower end of the third tubular body 18) 'The female is equipped with the foot pad 19 belonging to the front end member. Bamboo, the tubular body 16, 17, 18 is formed into a cross-sectional shape of the entire length 320308 (revision) 7 1354744 Patent No. 97122〇65 Patent_Requests _ 丨100 years 7 “曰 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The 17 and 18 series are inscribed, and the thickness of the wall of the tube is 0.35 mm to 〇.4 mra. Further, the inner diameters of the tubular bodies 16, 17 of the tubular bodies 16, 17, 18 adjacent to each other. The tubular shape of the other side, the outer diameters of the outer diameters of 17, 18 are substantially opposite, and the adjacent bodies 16, 17, 18 are adjacent to each other inside and outside. In addition, the telescopic agricultural device 12 is provided with a restriction means such as a locking means, and the means 2 is provided at an upper end portion of the second tubular body 17 for restricting the second tubular body 17 with respect to the first tubular shape. The movement of the body 16 in the axial direction (that is, the vertical movement) and the second restriction means (the restriction means are provided at the upper end portion of the third tubular body 18 for restricting the third tubular body 18 relative to the first 2 The movement of the tubular body π along the axial direction (that is, the vertical movement). Here, the lower end portion of the first tubular body 16 and the lower end portion of the second tubular body 17 are respectively formed with a rectangular shape which is separated from each other and opposed to each other. One of the outer holes 4 23 and 24 is formed at the upper end portion of the second tubular body π and the upper end portion of the third tubular body 18, and the inner holes 4 25 and 26 are formed through the rectangular shape of the divided (four) direction. The portions 23 and 24 have the same shape as the inner hole portions 25 and 26. Further, as shown in Fig. 7 and the like, the second tubular body 1 is maximally protruded with respect to the first tubular body 16, and the second portion The inner hole portion 25 at the upper end portion of the tubular body 17 is integrally opposed to the outer hole portion 23 at the lower end portion of the first f-shaped body 16. In a state in which the third tubular body 18 is maximally protruded with respect to the second tubular body 17, the inner hole portion 26 at the upper end portion of the third tubular body 18 is integrally formed with the outer portion of the lower end portion of the tubular body 17 of the crucible 2 % Overall 320308 (Revised Edition) 8 Relative. Dijon m22065 Patent Application 10th Anniversary July 26曰 Correction Replacement Page Positioned at (4) Means ^ _ Means 22 has: a pair of = equal limit body 3 In the horizontal direction of the direction relative to the direction (the telescopic direction of the telescopic dream), and the limitation of the horizontal direction, and each limit Zhao / Chao ·: ^:: square ^ _ Zhao 31 tubular two as the most large = The third elastic body restricting body 31 protrudes from the inner tubular hole portion 26 of the third tubular body outside the third tubular body 18 and enters the second tubular shape by the movement of the elastic force of the body 32 in the protruding direction. The outer tubular body 24 is limited to the third tubular body (four) by the restriction portion 33 before the restriction body 31 of the protruding state 31 and the buckle 5' of the outer peripheral portion of the second tubular body π (2) movement of the tubular body π in the axial direction (that is, moving up and down) β at this time, the protruding portion of the restraining body is from the outer portion of the second tubular body 17 The protrusion 24 protrudes outside the second tubular body 17 and is exposed to the outside. On the other hand, as shown in FIG. 4 and the like, when the entire third tubular body 18 is housed in the second official body π, the two restricting bodies 31 do not protrude beyond the third tubular body 18 but are located. Inside the third tubular body 18. In other words, the front end portion of the restricting body 31 is located in the third tubular portion 18 in a state in which the inner surface of the elastic body 32 is in contact with each other: 7 Further, each restricting body 31 has a restriction on the front end side. The portion 33 is modified in the third tubular body 18 with respect to the second tube 320308 (revision) 9 1354744 I · p - 1 1 Patent Application No. 097122065 - July 26, 100, when the expansion device 12 is extended When the replacement page body 17 is moved downward, the restricting portion 33 is formed from the entire inner hole portion 26 of the third tubular body 18 and the outer hole portion 24 of the second tubular body 17 as a whole. The third tubular body 18 gradually moves into the outer hole portion 24 with respect to the downward movement of the second tubular body 17. In the restricting portion 33, a pressed surface 34 that gradually enters the hole portion 24 of the second tubular body 17 as the third tubular body 18 moves downward with respect to the second tubular body 17 is formed. The pressed surface 34 is formed to have an inclined surface shape with respect to the axial direction of the third tubular body 18 (the direction orthogonal to the moving direction) from the lower end of the distal end surface to the upper end of the distal end surface. In other words, the front end surface of the restricting body 31 is constituted by a curved surface-like pressing surface 34 which is gradually inclined toward the outer side from the upper end toward the lower end and which is slightly convex toward the outer side. Further, the protruding direction distance L between the upper end and the lower end of the pressed surface 34 is larger than the thickness of the second tubular body 17 (refer to Fig. 10). Further, each of the restricting bodies 31 has a projectile receiving portion 35 having a substantially cross-sectional U-shaped cross section on the proximal end side. One end portion of the projectile body 32 is fitted to the projectile body receiving portion 35 of one of the restricting bodies 31, and the other body of the projectile body 32 is embedded with the pin body 32 of the other restricting body 31. One end. The projecting body receiving portion 35 has a shape larger than that of the inner hole portion 26, and the restraining body 31 cannot be removed from the third by the inner surface of the inner peripheral portion 26 of the third tubular body 18 by the elastic body receiving portion 35. The tubular body 18 is detached. On the other hand, the first restriction means 21 has a restriction body 41 such as a pair of positioning pins, and is protruded in a horizontal direction orthogonal to the axial direction of the second tubular body 17, similarly to the second restriction means 22. The direction of the direction Α and the direction of the reverse protrusion B are separated and opposed to each other; and a compression spring, etc. 10 320308 (revision) 1354744 Patent application No. 097122065 Patent application, July 26, pp. 42' is placed in the two restricted body 41 to push in different protruding directions A. When the second tubular body 16 is in the maximum protruding state, the length of the elastic body 32 of the second restricting means 22 is further limited to that of the second tubular body 16 as shown in FIG. 7 is in the protruding direction with respect to the projectile thrust of the first projectile body 42. The 41 is protruded from the second tubular body 7 by the inner hole portion 25 of the crucible, and the hole portion 23 is formed from the outer portion of the second tubular body 16. The restriction portion 43 that enters and enters the end portion of the first tubular body and the i-th tubular body 16=and the restriction body 41 are forwarded together to restrict the movement of the second tubular body 17:: mobile). The axial direction of the -shaped body 16 is in the state of the fourth tubular body as shown in the fourth aspect, and the second restricting body 41 does not protrude outside the body, but is located in the second tubular shape. Within body 17. That is, the other end portion is located in the inner hole 2 of the second tubular body 17 in a state in which it is pushed by the projectile body 42 and is in contact with the inside of the i-th tubular body 16. Each of the restriction dragons 41 has a restricting portion 43 on the distal end side, and moves downward in the second tubular body 17 with respect to the inner hole a of the first tube in the extending state. In addition, the restricting portion 43 is downwardly moved from the entire outer portion of the second tubular body 17 to the outer portion of the hole portion 23 of the first tubular body 16, and the second tubular body 17 is opposed to the first one. The tubular body 16 is gradually inserted into the outer hole portion 23. The restricting portion 43 is formed to gradually move the second regular body 17 downward with respect to the first tubular body 16 into the pressed surface 11 of the outer tubular portion 23 of the first tubular body 16 (revision). Uy/i22〇65# Patent A request 44 ^ ^4* 1A: ^ ^ ^ L·00 July 26曰 Correction replacement page The first two sides of the 44 series are subordinate to the lower end of the end face and contain the cross to belong to the mobile Z The upper end is formed in an inclined surface shape with respect to the axial direction of the second tubular body 17 (phase 41 = direction orthogonal thereto). In other words, the restricting body surface is composed of a curved surface 44 which is slightly convex toward the outer side from the upper end toward the lower end and which is slightly convex toward the outer side. The "external" two restricting bodies 41 are covered by a cover body (not shown), and can be operated by the operation means of the lever and the lever of the cover body. When the restriction body 41 is pushed in the reverse projection direction B = °, the configuration of the pressed surface 44 of the restriction body 41 may be directly pressed by a finger or the like without providing a cover body and an operation means. Each of the restricting bodies 41 has a cross-section substantially perpendicular to the U-shaped mountain portion 45° on the proximal end side, and one end portion of the elastic body of the restraining body 41 of the restraining body 41 is received, and the restraining body pushes the body in the other side. The other part of the 45th body is provided with the other end of the projectile body 42. The second part of the projectile 3!^ is smaller than the inner hole portion 25 by the inner surface of the inner hole portion 25 of the body 17 by the elastic body The restraining body 41 is prevented from being detached from the inside of the S 2 tubular body 17. Next, the action of the above-described tripod 10 and the like will be described. When the extension = three = two degrees, the telescopic device belonging to the rupture of the secluded portion is separated and grasped. The accommodating state 7 in the contracted state shown in Fig. 4 is from the first tubular body, and the third tubular body 18 is made from the second tubular body. For the first pipe movement, and the third tubular body 18 is opposed to the second tubular shape 320308 (revision) 12 1354744 • » Patent Application No. 097122065 1 July 26, pp. Although the fifth figure shows the ♦ dimension, the restriction part 43 is in the middle of the extension operation of the set 12 (the restriction part 43 of the leg extension 41 is based on the first restriction means 21). When the body motion is restricted and the outer tube of the first tubular body 16 is pushed, the protrusion 17 is moved toward the protruding direction A to become the second official state with respect to the first tubular body P 23 ', and then, if it is telescopically mounted, When the 12th becomes the state of the extension of the Agricultural University, the position of the restriction body 31 of the Ζ 丄 丄 丄 丄 丄 丄 , , , , , , , , , , , M M M M ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ And the direction of the dog is shifted by 9 σ| Μ ', and the third tubular body 18 is locked with respect to the body 2 of the ¥2. 1 The extension operation of the expansion device 12 is shown in Fig. 6 as shown in Fig. 6. From the time point before the restriction portion of the second tubular body or the restriction body 41, that is, the entire inner hole portion 25 of the entire outer hole portion 23 of the first tubular body 16 and the hole portion 2 entering the outer portion of the first tubular body 16 ° The outer hole portion 23 is not correctly inserted, and (4) there is no possibility that the restricting portion 43 is detached from the body 16. Further, similarly, the shape of the first tubular portion 33 from the first tubular portion 33 is restricted from the inner diameter of the third tubular body 18, and the outer portion of the hole portion 24 is opposed to the outer portion. The whole and the second tubular body are outside the hole 24, so that the second tubular body 24 is not limited, and the third tubular body 18 is not correctly entered into the outer shape from =33. In the case of g-body 17 detachment, in the case of using a tripod to contract, the user first operates the lever and the operating means such as the operating lever in the telescopic device 12, and the operation is limited. FIG. 41 is moved toward the reverse protruding direction B by 320308 (revision). 13 1354744 _ Patent No. 097122065, the patent application, July 26, pp. Second, the locking of the tubular body 17 with respect to the first tubular body 16, that is, the state in which the second tubular body 17 is allowed to move upward relative to the first tubular body 16. Then, the user pushes the foot pad 19 at the lower end portion of the telescopic device 12, and moves the second tubular body 17 upward relative to the first tubular body 16. Fig. 8 shows the middle of the contraction operation of the telescopic device 12 (in the middle of the retraction of the foot), but in the middle of the contraction operation, as shown in Fig. 9 to Fig. 11, the restriction state of the protruding state of the second restriction means 22 When the 31 is in contact with the axial end portion 16a of the first tubular body 16, the restricting body 31 is moved in the reverse protruding direction B by the pressing action by the axial end portion 16a of the first tubular body 16 Further, the second tubular body 17 is further moved in the reverse projection direction B by the pressing action generated by the periphery of the hole portion 24 of the second tubular body 17, and is detached from the hole portion 24 outside the second tubular body 17, and as a result, the third portion is released. The locking of the tubular body 18 with respect to the second tubular body 17, that is, the upward movement of the third tubular body 18 with respect to the second tubular body 17, allows the expansion and contraction device 12 to be in the stored state shown in Fig. 4. In other words, as shown in Fig. 9, when the pressed surface 34 of the restraining body 31 in the protruding state abuts against the axial end portion 16a of the first tubular body 16, the second tubular body 17 and the third tubular body are The upward pressing of the first tubular body 16 causes the pressed surface 34 to be pressed by the axial end portion 16a of the first tubular body 16, thereby causing the restricting body 31 to resist the elastic pushing of the elastic body 32. The anti-protrusion direction B moves. Next, as shown in Fig. 10, when the axial end portion 16a of the first tubular body 16 is separated from the pressed surface 34 of the restricting body 31, this time is due to the 14 320308 (Revised Edition) No. 09·7122065 Patent claim case 100 years July 26 曰 correction replacement ^ 3 tubular body 18 relative to the first? At the end of the L Guardian, the 26th 曰 曰 3 3 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 The restraining portion 33 of the counter-protrusion body 17/the hole body 31 is detached from the second tube 抵抗 against the spring of the projectile body 32, and thus the third tubular body 18 is locked with respect to the second tubular body 17 It is released. 2fi, according to the expansion and contraction device 12, if the inner hole portion of the third tubular body 18 is extended and the outer diameter of the second tubular body 17 is opposite to the second tubular body 17, the restriction body 31 is guided by the elastic body 32. The movement of the projectile thrust direction A is from the inner hole portion 26 toward the third tubular body 18 # Ή into the hole / 24 hole, and by the limit state of the protruding state (4) ιί 2 the outer hole portion of the tubular body 17 The engagement of the 24th circumference restricts the third official body 18 from moving in the axial direction of the second tubular body 17. On the other hand, when the contraction action of 12 is set, the restraining body 31 of the protruding state is the shape of the body. When the end portion (10) abuts, the restricting body 31 I7 is moved by the pressing action of the axial end portion 16a of the first tubular body 16 and moves toward the reverse protruding direction B, and then the second tubular body is Since the pressing force generated by the peripheral edge of the outer hole portion 24 is further displaced from the outer hole (four) by further movement in the reverse protruding direction b, it is not necessary to form the inner convex portion for preventing the falling off in the second tubular body π, or in the third The tubular body 18 is formed to prevent the outer convex portion from falling off, so that the tubular body 16 and 17 can be easily manufactured without the skill of the craftsman or the like. Further, since 18, the manufacturability is good, and the manufacturing cost can be reduced. Moreover, even if aluminum is used as the material of the tubular bodies 16, 17, and the crucible 8, there is no difficulty, and a lightweight and strong telescopic device can be obtained. </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The movement of the body 17 gradually enters the pressed surface 34 of the outer hole portion 24, and the pressed surface 34 is formed into an inclined surface from the end of the front end surface of the restricting body 31 to the other end of the front end surface. In the restricting portion 43 of the restricting body 41, the pressed surface 44 that gradually enters the outer hole portion 23 as the second tubular body 17 moves relative to the first tubular body 16 is formed, and the pressed surface 44 is pushed. The pressing surface 44 is formed in an inclined surface shape from the end of the front end surface of the restricting body 41 to the other end of the front end surface, so that the third tubular body 18 can be prevented from being separated from the second tubular body 17 and the second tubular body 17 can be appropriately prevented. 1 The tubular body 16 is detached. Further, the expansion/contraction device 12 is not limited to a three-stage type having three tubular bodies 16, 17, and 18, and may be, for example, a two-stage type or a four-stage type or the like. Further, although the case where the telescopic device 12 is used as the foot device of the tripod 10 has been described, it can be applied to other stand devices and the like. Further, the restriction means 22 is not limited to the configuration having the pair of restriction bodies 31, and may be, for example, a configuration in which only one of the restriction members 31 on one side is provided. (Industrial Applicability) The present invention is applicable to, for example, a footrest device of a tripod or other tripod device. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial perspective view showing a telescopic device according to an embodiment of the present invention. Figure 2 is a partial perspective view of the telescopic device. 16 320308 (Revised Edition) 1^4744 Patent Application No. 097122065 Patented July 26, pp. 26, revised replacement page Fig. 3 is a schematic perspective view of a tripod equipped with the telescopic device. Figure 4 is a cross-sectional view showing the contracted state of the telescopic device. Fig. 5 is a cross-sectional view showing the stretching operation of the telescopic device. Figure 6 is an enlarged cross-sectional view of the & portion of Figure 5. Figure 7 is a cross-sectional view showing the stretched state of the telescopic device. Fig. 8 is a cross-sectional view showing the contraction operation of the telescopic device. Figure 9 is an enlarged plan view of the portion b of Figure 8. Fig. 10 is an enlarged cross-sectional view showing the pressing surface of the restricting body immediately before being pressed by the periphery of the hole portion of the second tubular body. Fig. 11 is an enlarged cross-sectional view showing a state in which the pressed surface of the restricting body is moved by the periphery of the hole portion of the second tubular body. Figure 12 is a cross-sectional view showing the contracted state of the conventional telescopic device. Fig. 13 is a cross section of an extension state of the conventionally known telescopic device. [Description of main components and symbols] la The inner convex portion 2a for preventing the fall-off prevention of the outer convex portion 3 The restriction means 10 The tripod 12 The telescopic device 16 The first tubular body 17 2 tubular body 19 foot pad 2 2b 4 11 13 16a 18 21 upper tubular body lower tubular body hole portion of the upper body of the camera body in the axial direction of the third tubular body as a locking means or the like, the first restriction means 320308 (corrected 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Restricted portion 34 pressed surface 35 Elastic body receiving portion 41 Restricting body 42 Elastic body 43 Restricted portion 44 Pressed surface 45 Elastic body receiving portion A Projection direction B Reverse projection direction 18 320308 (Revised version)