200803770 (1) 九、發明說明 【發明所屬之技術領域】 本發明是關於例如家具類抽屜或影印機紙匣等被設置 在沿著指定方向形成相對性往復運動的一對構件之間’該 等構件相對進退運動支承用的滑軌單元，特別是關於由3 支軌構成，可使抽屜等活動構件從家具本體等固定部以大 行程抽出的滑軌單元。 【先前技術】 習知，家具或系統廚具的抽屜及影印機紙匣等活動構 件的進退運動支承用的引導構件，已知有具備外軌和內軌 的滑軌單元（專利文獻1 )。具體而言，其是由：一對滾 珠滾走部沿著長度方向捲起形成爲溝槽狀的外軌·，形成比 該外軌還小一圈，也是由一對滾珠滾走部捲起形成爲溝槽 狀的內軌；滾走在該等外軌滾珠滾走部內側和內軌滾珠浪 走部外側的多數滾珠；及可使滾珠以指定間隔序列在上述 外軌和內軌之間的保持板所構成，例如：上述外軌是固定 在家具本體，內軌是固定在抽屜的兩側面。 此外，已知又有將2支上述滑軌單元組合’藉此使行 程量增大的滑軌單元（專利文獻2 )。具體而言’是將2 支滑軌單元的內軌彼此以背對背的狀態形成結合構成中間 軌，一方的外軌是做爲固定軌使用，另一方的外軌是做爲 移動軌使用。於該滑軌單元，中閭軌是對固定軌形成滑動 ，又移動軌是對中間軌形成滑動，因此能夠使移動軌滑動 -5- 200803770 (2) 超過固定軌全長’例如可使抽屜整體從家具本體抽出，其 優點是容易將物品放入抽屜或從抽屜拿出。 〔專利文獻1〕日本特開平11-201158號公報 〔專利文獻2〕日本特開2003-120126號公報 【發明內容】 〔發明欲解決之課題〕 然而，習知的滑軌單元，由於做爲移動軌或固定軌的 外軌是形成爲溝槽狀，爲了形成滾珠滾走部只是將沿著金 屬板長向的兩端邊仿照滾珠球面形成捲起形狀，所以該移 動軌及固定軌的二次慣性矩小，例如在抽屜全開的狀態下 抽屜內收納有多量物品時，移動軌容易產生扭曲、彎曲變 形。因此，移動軌的相對於中間軌的移動阻力變大，抽屜 收入至家具本體內時的操作感覺變重，惟恐有損家具其本 身的高級格調。 此外，由於中間軌是2支內軌背對背結合著，所以是 比移動軌還難以產生扭曲、彎曲變形’但其背對背的結合 並非長達中間軌全長，而只是以點焊進行局部性結合’終 就在作用有較大載重時中間軌容易變形。因此’中間軌縮 入至固定軌時的阻力及移動軌縮入至中間軌時的阻力就會 變大，這也是抽屜收入至家具本體內時操作感覺變重的原 因。 再加上，上述內軌及外軌’包括滾珠滾走部是只利用 輥軋成型加工來完成其形狀，但在生產滑軌單元的中間軌 -6- 200803770 (3) 時’需要以點焊進行2支內軌的結合作業，因需要增加作 業’所以也有生產成本上昇的問題點。 〔用以解決課題之手段〕 本發明是有鑑於上述問題點而爲的發明，其目的是提 供一種可抑制中間軌及移動軌扭曲，即使在載重作用時還 是能夠以輕盈的操作感執行移動軌的抽出及納入，又能儘 可能地降低生產所需作業量，能以低成本生產的滑軌單元 〇 爲達成上述目的，本發明的滑軌單元，是由：固定軌 ;透過複數滾珠組裝在上述固定軌，沿著該固定軌長度方 向形成移動自如的中間軌；及透過複數滾珠組裝在上述中 間軌，沿著該中間軌長度方向形成移動自如的移動軌所構 成。上述中間軌是具有彼此成鄰接的同時朝相反方向突出 的一對矩形導座且形成爲剖面大致S字形。上述固定軌是 形成爲剖面大致C字形可從外側包覆著中間軌一方導座， 此外，上述移動軌是形成爲剖面大致C字形可從外側包覆 著中間軌另一方導座。 如上述，中間軌是藉由將形成矩形的一對導座成反向 連接使其剖面形狀形成爲大致S字形，所以該中間軌的二 次慣性矩就變大，能夠抑制載重作用時的扭曲或彎曲變形 。此外，固定軌及移動軌是形成爲剖面大致C字形可從外 側包覆著中間軌的導座，所以勢必是形成比中間軌的導座 還大一圈尺寸的矩形，該等固定軌及移動軌的二次慣性矩 200803770 (4) 也是設定成較大，因此能夠抑制載重作用時的扭曲或彎 變形。即，於本發明的滑軌單元，將中間軌的剖面形狀 成爲大致S字形，藉此不但使中間軌其本身的二次慣性 變大，還使和該中間軌組合的固定軌及移動軌的二次慣 ~ 矩也變大，使單元整體的構造形成爲可抑制載重作用時 扭曲。如此一來，就能夠讓中間軌順暢滑行在固定軌， 移動軌順暢滑行在中間軌，即使載重作用時也能夠以輕 的操作感執行移動軌的抽出及納入。 此外，由於中間軌其垂直於長度方向的剖面是形成 致S字形，所以只要利用彎曲加工、拉製加工等塑性加 就能夠形成，不需要如習知中間軌般的焊接作業，因此 夠廉價製造中間軌。除此之外，上述固定軌及移動軌也 夠以中間軌相同的手法製作，因此也能夠將製作所需的 備投資抑制成最小限度。 【實施方式】 〔發明之最佳實施形態〕 以下，是使用附圖對本發明滑軌單元進行詳細說明 第1圖及第2圖爲表示應用本發明之滑軌單元的第 實施形態透視圖。該滑軌單元，是由··固定軌1 ;透過 數滾珠4組裝在上述固定軌1的中間軌2 ;及透過複數 珠4組裝在上述中間軌2的移動軌3所構成。接著，利 設置在各軌1、2、3之間的滾珠4的滾動，使上述中間 2能夠在固定軌1形成移動自如，再加上使移動軌3能 曲 形 矩 性 的 讓 盈 大 工 能 能 設 複 滾 用 軌 夠 -8- 200803770 (5) 在中間軌2形成移動自如。 首先，如第3圖所示，上述中間軌2其垂直於長度方 向的剖面是形成爲S字形。該S字形的剖面是由形成爲矩 形的一對導座2a、2b組合形成。該等導座2a、2b具備有 * 彼此鄰接的同時朝相反方向形成開放的溝槽20，中間軌2 是由該導座2a、2b連接形成具有大致S字形的剖面。該 中間軌2，具有：中央壁21及和該中央壁21隔著上述溝 槽20形成設置的一對側壁22、22，於各側壁22的外側面 及中央壁2 1的兩側面分別形成有滾珠4的滾動溝槽23。 另一方面，上述固定軌1其垂直於長度方向的剖面是 形成大致C字形，成爲可將上述中間軌2的導座2a從外 側包覆在內的形狀。該固定軌1具備有夾著導座2a形成 相向的一對側壁1 1、1 2，於各側壁1 1、1 2的內側面形成 有滾珠4的滾動溝槽i 3。此外，該滾動溝槽1 3是和形成 在中間軌2的滾珠4滾動溝槽2 3成相向著，滾珠4是在 中間軌2的滾動溝槽23和固定軌1的滾動溝槽i 3之間一 邊負荷著載重一邊滾動。 另外’上述移動軌3具有和固定軌1完全相同的構造 ，成爲可將上述中間軌2的導座2b從外側包覆在內的形 狀。即’該移動軌3具備有夾著導座2b形成相向的一對 側壁3 1、3 2，於各側壁3 1、3 2的內側面形成有滾珠4的 滾動溝槽3 3。此外，該滾動溝槽3 3是和形成在中間軌2 的滾珠4滾動溝槽2 3成相向著，滾珠*是在中間軌2的 滾動溝槽2 3和移動軌3的滾動溝槽3 3之間一邊負荷著載 -9 - (6) (6)200803770 重一邊滾動。 於上述固定軌1、中間軌2及移動軌3的製作時，利 用電火花加工成型從金屬塊就能夠切出該等軌。於該狀況 時，滾珠4的滾動溝槽13、23、33是在電火花加工成型 後以切削加工、硏削加工等手法形成。上述滾動溝槽1 3、 2 3、3 3的形成方法，以軋製成型加工用旋轉的輥壓潰金屬 板表面也是能形成滾動溝槽，採用該手法時，經由塑性變 形造成的金屬板表面加硬化是可獲得耐磨損性高的滾動溝 槽。 但是，就低成本製作的觀點而言，是不採電火花加工 成型，而是以使用拉製加工或壓製機進行彎曲加工，經由 各種塑性加工使各軌形成上述形狀，然後利用壓製加工等 塑性加工手法形成滾珠4的滾動溝槽13、23、33爲佳。 此外，於上述中間軌2的導座2 a和固定軌1的間隙 ，及於導座2b和移動軌3的間隙，分別裝設有可使滾珠4 以指定間隔形成序列的保持板5 a、5 b。該等保持板5 a、 5b是經由對金屬薄板施以彎曲加工使其形成爲適合上述間 隙的形狀即矩形形狀。此外，於各保持板5a、5b是打孔 形成有以滾珠4直徑還稍微大直徑的滾珠保持孔，滾珠4 是以被收容在該等滾珠保持孔內的狀態滾走在固定軌1的 滾動溝槽1 3上或移動軌3的滾動溝槽3 3上。 另，圖示例中，上述保持板5a、5b是使用金屬薄板 ，但只要板厚可形成爲能配置在中間軌2和固定軌1間隙 ，及中間軌2和移動軌3間隙的薄度，則也可用合成樹脂 -10- 200803770 (7) 製作上述保持板5 a、5 b。例如冰箱中做爲滑動收納的引導 裝置是採用本發明的滑軌單元時，爲了防止保持板5a、5b 在固定軌1、中間軌2或移動軌3形成凍凝作用，上述保 持板5a、5b是以合成樹脂製爲佳。 接著，於以上構成的滑軌單元，上述中間軌2是由形 成爲矩形的一對導座2a、2b連接形成大致S字形，當該 中間軌2以樑來做爲考量時，可將其二次慣性矩設定成較 大，因此該中間軌2相對於彎曲及扭曲的剛性就會變高。 另外，上述固定軌1及移動軌3是形成剖面大致C字形可 從外側包覆著中間軌2的導座2 a、2b，所以勢必是形成比 中間軌的導座還大一圈尺寸的矩形。因此，針對固定軌1 及移動軌3，若將該等也是以樑來做爲考量時，其二次慣 性矩也會變大，於是該等相對於彎曲及扭曲的剛性就會變 局。 第4圖及第5圖是表示該滑軌單元應用在家具抽屜的 滑動構件時其槪略平面圖及側面圖。於該例中，滑軌單元 是配置在抽屜6的兩側面。上述移動軌3是固定在抽屜6 ，另一方面，固定軌1是固定在家具本體7。於抽屜6收 納在家具本體7的狀態下，固定軌1、中間軌2及移動軌 3是形成重疊，但當抽屜6從家具本體7抽出時，移動軌 3是對中間軌2形成移動，另一方面，中間軌2是對固定 軌1形成移動，藉此支承著抽屜6從家具本體7抽出時的 移動。 抽屜6從家具本體7成抽出的狀態，即第4圖及第5 -11 - 200803770 (8) 圖所示的狀態下，將物品收納在抽屜6時，對抽屜6會作 用著向下的載重F，所以對夾著抽屜6形成配置的一對滑 軌單元是作用著可將移動軌3的前端及中間軌2的前端朝 下方下壓的彎矩，除此之外，還作用著可將移動軌3從中 間軌2、固定軌1拉離的扭矩。因此，當固定軌1、中間 軌2及移動軌3的剛性較低的狀況時，在中間軌2及移動 軌3會產生彎曲變形及扭曲，導致抽屜6收入家具本體7 時的操作感覺變重。 但是，本發明的滑軌單元，如以上所述，能夠使各軌 1、2、3的二次慣性矩設有成較大，形成爲相對於彎曲及 扭曲之剛性高的軌，因此即使抽屜6有載重F作用時，還 是能夠在維持著輕盈操作感的狀態下，將抽屜6收入家具 本體7。 另’第4圖及第5圖所示的例子中，將各滑軌單元固 定在抽屜6的側面，但也可將移動軌3固定在側面附近的 底面。 其次’第6圖是表示應用本發明之滑軌單元的第二實 施形態。 該第二實施形態的滑軌單元，也是由··固定軌1 〇 i ; 透過複數滾珠4組裝在上述固定軌1 〇 1的中間軌〗〇 2 ;及 透過複數滾珠4組裝在上述中間軌丨〇 2的移動軌1 〇 3所構 成。但是’固定軌1 0 1、中間軌1 〇 2及移動軌1 〇 3是利用 輕軋成型加工將金屬板材彎曲成指定形狀形成，於該輥軋 成型加工時在各軌的指定位置形成滾珠4的滾走溝槽。即 -12- 200803770 Ο) ，軌形成爲指定形狀的作業和滾珠滾動溝槽形成的作業是 同時進行，藉此以低成本就能夠製作各軌。 首先，上述中間軌1 02，是由形成矩形的一對導座 1 02a、1 022b組合形成爲大致S字形。該中間軌1 022，具 有：中央壁1 2 1及和該中央壁1 2 1隔著溝槽形成設置的一 對側壁1 2 2、1 2 2，於各側壁1 2 2的外側面及中央壁1 2 1的 兩側面分別形成有滾珠4的滾動溝槽1 2 3。該等滾動溝槽 123是上述中央壁12 1及側壁122的一部份經輥軋成型加 工彎曲形成，於該滾動溝槽1 2 3形成著滾珠4直徑約5 5〜 6 6 %的曲率半徑。接著，強制地彎曲金屬板材使其內側曲 面成爲滾動溝槽123，該滾動溝槽123的表面硬度會因加 工硬化而上昇，所以具有能夠使滾珠4滾動時的滾動溝槽 1 23成爲良好耐磨損性的優點。 另一方面，上述固定軌1 0 1是形成可從外側將上述中 間軌102的導座102a包覆在內的剖面大致C字形，具備 有夾著導座1 〇2a形成相向的一爲側壁1 1 1、1 1 2。於各側 壁1 1 1、1 1 2的內側面形成有滾珠4的滾動溝槽1 1 3，滾珠 4是在中間軌1 〇2的滾動溝槽1 23和固定軌1 0 1的滾動溝 槽113之間一邊負荷著載重一邊滾動。該固定軌也是由金 屬板材經輥軋成型加工捲起形成，於該加工時形成有上述 滾動溝槽1 1 3。滾動溝槽1 1 3的曲率半徑是和中間軌1 02 的滾動溝槽123相同。 此外，於上述固定軌1 0 1 —體設有垂直於該固定軌 1 〇 1長度方向的剖面形成爲L字形的安裝部1 1 4。該安裝 -13- 200803770 (10) 部1 1 4，是藉由從一方的側壁1 11前端回折上述金屬板材 ，又朝下方使凸緣部1 1 5下垂而形成，設置成和上述側壁 1 1 1成一體。該安裝部1 1 4從側壁1 1 1前端回折形成的結 果，使側壁1 1 1和安裝部1 1 4成爲二片重疊的狀態，提昇 側壁1 1 1的剛性。如此一來，從固定軌1 〇 1拉出中間軌 1 02及移動軌103時，就能夠防止該固定軌1〇1的一對側 壁1 1 1無法抵抗載重而往外側張開的不利現象產生。另外 ，因大致L字形的安裝部1 1 4是設置和固定軌1 0 1成一體 性，所以也會提高固定軌1 0 1其本身的剛性，使固定軌 1 0 1難以產生扭曲或彎曲變形。另，圖號1 1 6是固定軌 1 0 1假固定在家具本體等時所利用的掛飽。 再加上，上述移動軌1 03是形成可從外側將上述中間 軌102的導座102b包覆在內的剖面大致C字形，具備有 夾著導座1 02b形成相向的一對側壁！ 3丨、；! 3 2。於各側壁 1 3 1、1 3 2的內側面形成有滾珠4的滾動溝槽丨3 3，滾珠4 是在中間軌1 〇 2的滾動溝槽1 2 3和移動軌1 〇 3的滾動溝槽 133之間一邊負荷著載重一邊滾動。該移動軌103也是由 金屬板材經輥軋成型加工捲起形成，於該加工時形成有上 述滾動溝槽1 3 3。滾動溝槽1 3 3的曲率半徑是和中間軌 102的滾動溝槽123相同。 又加上，於上述移動軌1 〇 3 —體設有上述側壁丨3 1從 其前端回折形成的安裝部1 3 4。該安裝部丨3 4從側壁1 3 1 前端回折形成的結果，使側壁1 3 1和安裝部丨3 4成爲二片 重疊的狀態，提昇側壁1 3 1的剛性。這點是和固定軌1 〇 i -14- 200803770 (11) 的側壁111相同。另’上述安裝部134也可和移動軌l〇3 個別製作’然後利用焊接等手法使其和移動軌丨〇 3的側壁 1 1成爲一體。 此外’於上述中間軌1 〇 2的導座1 〇 2 a和固定軌1 0 1 的間隙’及於導座1 0 2 2 b和移動軌1 〇 3的間隙，分別裝設 有可使浪珠4以指定間隔形成序列的保持板1 〇 5 &、1 〇 5 b。 第7圖爲表示該第二實施形態滑軌單元的使用狀態圖 ’是圖示著滑動式收納庫1 42支承在冰箱框體1 4 1的例子 。固定軌1 0 1是使用固定螺栓i 4 3固定在冰箱框體1 4 1的 內側面。於上述框體1 4 1形成有開口 1 44，將突出設置在 固定軌的掛鉤1 1 6插入上述開口，就能夠使滑軌單元假固 定在冰箱框體1 4 1，如此一來就容易進行上述固定螺栓 143的鎖緊作業。此外，於固定軌ι〇1因設有朝下方突出 的凸緣部1 1 5，所以即使中間軌丨〇2及移動軌1 〇3和固定 軌1 〇 1成爲重疊狀態，固定軌1 〇 1還是能夠容易以螺栓固 定在冰箱框體1 4 1。 如上述將滑軌單元的整體固定在框體1 4 1之後，使用 固定螺栓143將上述收納庫142固定在移動軌103。由於 該滑軌單元是於移動軌103上部設有平坦的安裝部134， 所以上述收納庫1 42就能夠從上方放置在移動軌1 03上， 固定螺栓1 43不用鎖緊也能夠將收納庫1 42支承在移動軌 1 〇 3。因此，收納庫1 4 2固定在移動軌1 〇 3上的固定作業 也就能夠容易進行。 接著，於該第二實施形態的滑軌單元中，也是將各軌 -15- (12) (12)200803770 1 0 1、1 02、1 0 3各自的二次慣性矩設定成較大，使各軌都 具有相對於彎曲及扭曲的高剛性，所以在中間軌1 02及移 動軌1 〇 3從固定軌1 0 1依順序拉出的狀態下即使向下的載 重作用在該移動軌1 03時，還是能夠維持原有的輕盈操作 感將移動軌1 03及中間軌1 02納入固定軌1 〇 1。 再加上，於該第二實施形態的滑軌單元中，固定軌 1 〇 1、中間軌1 02及移動軌1 03是利用輥軋成型加工形成 ，在各軌加工成指定形狀的同時形成有滾珠的滾動溝槽， 所以這和之後再以另項作業加工形成有該滾動溝槽的狀況 相比其生產性極高，能夠以低成本生產滑軌單元。 【圖式簡單說明】 第1圖爲表示本發明滑軌單元的第一實施形態透視圖 〇 第2圖爲第1圖所示滑軌單元的正面圖。 第3圖爲表示中間軌的正面圖。 第4圖爲表示抽屜滑動機構應用滑軌單元時的應用例 槪略平面圖。 第5圖爲表示抽屜滑動機構應用滑軌單元時的應用例 槪略側面圖。 第6圖爲表示本發明滑軌單元的第二實施形態正面圖 〇 第7圖爲表示第二實施形態的滑軌單元安裝例正面圖 -16- 200803770 (13) 【主要元件符號說明 1 :固定軌 2 :中間軌 2a、2b :導座 3 :移動軌 4 :滾珠200803770 (1) EMBODIMENT OF THE INVENTION [Technical Field] The present invention relates to, for example, a furniture type drawer or a photocopying machine, etc., which are disposed between a pair of members which form a relative reciprocating motion along a specified direction. The slide rail unit for supporting the forward and backward movement supports, in particular, a slide rail unit which is constituted by three support rails and which can extract a movable member such as a drawer from a fixed portion such as a furniture body with a large stroke. [Prior Art] Conventionally, a guide member for supporting an advancing and retracting movement of a movable member such as a drawer of a furniture or a system tool and a copying machine such as a photocopier has known an outer rail and an inner rail (Patent Document 1). Specifically, the pair of ball rolling portions are rolled up in the longitudinal direction to form a groove-shaped outer rail, and are formed one turn smaller than the outer rail, and are also rolled up by a pair of ball rolling portions. Forming a groove-shaped inner rail; rolling off a plurality of balls on the inner side of the outer rail ball rolling portion and outside the inner rail ball running portion; and allowing the balls to be arranged between the outer rail and the inner rail at a specified interval The retaining plate is constructed, for example, the outer rail is fixed to the furniture body, and the inner rail is fixed to both sides of the drawer. Further, a slide rail unit in which two of the above-described slide rail units are combined' to increase the stroke amount is known (Patent Document 2). Specifically, the inner rails of the two rail units are combined to form an intermediate rail in a back-to-back state, one outer rail is used as a fixed rail, and the other outer rail is used as a moving rail. In the slide rail unit, the middle rail is formed to slide the fixed rail, and the moving rail is formed to slide the middle rail, so that the moving rail can be slid-5-200803770 (2) exceeding the full length of the fixed rail, for example, the whole drawer can be The advantage of the furniture body is that it is easy to put the item into the drawer or take it out of the drawer. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. 2003-120126 (Patent Document 2) [Problem to be Solved by the Invention] However, the conventional slide rail unit is used as a movement The outer rail of the rail or the fixed rail is formed into a groove shape. In order to form the ball rolling portion, only the two end sides along the long direction of the metal plate are formed into a rolled shape by the ball spherical surface, so the moving rail and the fixed rail are twice. The moment of inertia is small. For example, when a large amount of articles are stored in the drawer in a state where the drawer is fully opened, the moving rail is likely to be distorted and bent. Therefore, the movement resistance of the moving rail with respect to the intermediate rail becomes large, and the operation feeling when the drawer is collected into the furniture body becomes heavy, and it is feared that the high-grade style of the furniture itself is impaired. In addition, since the middle rail is a combination of two inner rails back-to-back, it is more difficult to produce distortion and bending deformation than the moving rails. However, the back-to-back combination is not as long as the intermediate rail length, but only local welding by spot welding. The intermediate rail is easily deformed when a large load is applied. Therefore, the resistance when the intermediate rail is retracted to the fixed rail and the resistance when the moving rail is retracted to the intermediate rail become large, which is also the reason why the operation feels heavy when the drawer is collected into the furniture body. In addition, the above-mentioned inner rail and outer rail 'including the ball rolling portion are formed by roll forming only, but in the middle rail of the production of the rail unit-6-200803770 (3), it is required to be spot welded. There is a problem that the production cost increases as a result of the combination of the two inner rails and the need to increase the number of operations. [Means for Solving the Problems] The present invention has been made in view of the above problems, and an object thereof is to provide a method of suppressing distortion of a middle rail and a moving rail, and capable of performing a moving rail with a light operational feeling even when a load is applied. The above-mentioned purpose is achieved by extracting and incorporating, and reducing the amount of work required for production as much as possible, and capable of producing the rail unit at a low cost, the rail unit of the present invention is: fixed rail; assembled through a plurality of balls The fixed rail forms a freely movable intermediate rail along the longitudinal direction of the fixed rail; and is assembled by the plurality of balls on the intermediate rail, and forms a movable moving rail along the longitudinal direction of the intermediate rail. The intermediate rail is a pair of rectangular guides which are adjacent to each other while projecting in opposite directions and are formed in a substantially S-shaped cross section. The fixed rail is formed in a substantially C-shaped cross section and can cover one of the intermediate rail guides from the outside. Further, the movable rail is formed in a substantially C-shaped cross section and can cover the other guide of the intermediate rail from the outside. As described above, the intermediate rail is formed by connecting a pair of guides forming a rectangular shape in a reverse shape so as to have a substantially S-shaped cross-sectional shape. Therefore, the secondary moment of inertia of the intermediate rail is increased, and the distortion at the time of the load can be suppressed. Or bending deformation. In addition, the fixed rail and the moving rail are formed as a guide having a substantially C-shaped cross section and covering the intermediate rail from the outside, so that it is necessary to form a rectangle which is larger than the guide of the intermediate rail, and the fixed rail and the movement The secondary moment of inertia of the rail 200803770 (4) is also set to be large, so that it is possible to suppress distortion or bending deformation when the load is applied. That is, in the slide rail unit of the present invention, the cross-sectional shape of the intermediate rail is substantially S-shaped, thereby not only increasing the secondary inertia of the intermediate rail itself but also the fixed rail and the moving rail combined with the intermediate rail. The secondary habits and moments also become larger, so that the overall structure of the unit is formed to suppress distortion when the load is applied. In this way, the intermediate rail can be smoothly slid on the fixed rail, and the moving rail can smoothly slide on the intermediate rail, and the moving rail can be extracted and incorporated with a light operational feeling even when the load is applied. Further, since the cross section perpendicular to the longitudinal direction of the intermediate rail is formed into an S-shape, it can be formed by plastic addition such as bending processing or drawing processing, and welding work such as a conventional intermediate rail is not required, so that it is inexpensive to manufacture. Middle rail. In addition to this, the above-mentioned fixed rails and moving rails can also be manufactured in the same manner as the intermediate rails, so that it is possible to minimize the investment required for production. [Embodiment] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the slide rail unit of the present invention will be described in detail with reference to the drawings. Figs. 1 and 2 are perspective views showing a first embodiment of a slide rail unit to which the present invention is applied. The slide rail unit is composed of a fixed rail 1; a middle rail 2 assembled to the fixed rail 1 by a plurality of balls 4; and a moving rail 3 assembled to the intermediate rail 2 via a plurality of beads 4. Next, the rolling of the balls 4 provided between the rails 1, 2, and 3 is performed, so that the middle portion 2 can be freely moved on the fixed rail 1, and the movement of the moving rail 3 can be made curved. It is possible to set the re-rolling rail enough -8- 200803770 (5) The middle rail 2 is free to move. First, as shown in Fig. 3, the cross section perpendicular to the longitudinal direction of the intermediate rail 2 is formed in an S shape. The S-shaped cross section is formed by a combination of a pair of guides 2a, 2b formed in a rectangular shape. The guides 2a and 2b are provided with a groove 20 which is open to the opposite direction while being adjacent to each other, and the intermediate rail 2 is connected by the guides 2a and 2b to form a substantially S-shaped cross section. The intermediate rail 2 has a central wall 21 and a pair of side walls 22 and 22 formed by the central wall 21 via the groove 20, and are formed on the outer side surface of each side wall 22 and both side surfaces of the central wall 21 The rolling groove 23 of the ball 4. On the other hand, the fixed rail 1 has a substantially C-shaped cross section perpendicular to the longitudinal direction, and has a shape in which the guide 2a of the intermediate rail 2 can be covered from the outside. The fixed rail 1 is provided with a pair of side walls 1 1 and 1 2 which face each other with the guide 2a interposed therebetween, and a rolling groove i 3 of the balls 4 is formed on the inner side surfaces of the side walls 1 1 and 1 2 . Further, the rolling groove 13 is opposed to the rolling groove 23 of the ball 4 formed on the intermediate rail 2, and the ball 4 is the rolling groove 23 of the intermediate rail 2 and the rolling groove i3 of the fixed rail 1. Rolling while loading the load on one side. Further, the above-mentioned moving rail 3 has the same structure as that of the fixed rail 1, and has a shape in which the guide 2b of the intermediate rail 2 can be covered from the outside. That is, the moving rail 3 is provided with a pair of side walls 31 and 32 which are opposed to each other with the guide 2b interposed therebetween, and a rolling groove 33 of the balls 4 is formed on the inner side surfaces of the side walls 31 and 32. Further, the rolling groove 3 3 is opposed to the rolling groove 2 3 formed in the intermediate rail 2, and the ball * is the rolling groove 2 3 of the intermediate rail 2 and the rolling groove 3 3 of the moving rail 3. Between the load on the side -9 - (6) (6) 200803770 heavy side scrolling. In the production of the fixed rail 1, the intermediate rail 2, and the moving rail 3, the rails can be cut out from the metal block by electric discharge machining. In this case, the rolling grooves 13, 23, and 33 of the balls 4 are formed by a cutting process or a boring process after the electric discharge machining. The method for forming the rolling grooves 1 3, 2 3, and 3 3 can also form a rolling groove by crushing the surface of the metal plate by a rolling roll for rolling forming. When the method is used, the surface of the metal plate is caused by plastic deformation. Hardening is a rolling groove in which high wear resistance is obtained. However, from the viewpoint of low-cost production, it is not subjected to electric discharge machining, but is subjected to bending processing using a drawing process or a press machine, and the respective rails are formed into the above shape by various plastic working, and then plasticity such as press working is performed. It is preferable that the processing means form the rolling grooves 13, 23, 33 of the balls 4. Further, a gap between the guide 2a of the intermediate rail 2 and the fixed rail 1 and a gap between the guide 2b and the moving rail 3 are respectively provided with holding plates 5a for forming the balls 4 at a predetermined interval. 5 b. The holding plates 5a, 5b are rectangular shapes which are formed into a shape suitable for the above-described gap by bending a thin metal plate. Further, in each of the holding plates 5a and 5b, a ball holding hole having a diameter slightly larger than the diameter of the ball 4 is formed, and the balls 4 are rolled on the fixed rail 1 in a state of being accommodated in the ball holding holes. The groove 13 is on the rolling groove 3 3 of the moving rail 3. In addition, in the illustrated example, the holding plates 5a, 5b are made of a thin metal plate, but the thickness of the intermediate rail 2 and the fixed rail 1 and the thickness of the gap between the intermediate rail 2 and the moving rail 3 may be formed as long as the thickness is set. The above holding plates 5a, 5b can also be produced by using synthetic resin-10-200803770 (7). For example, when the guide device for sliding storage in the refrigerator is the slide rail unit of the present invention, the retaining plates 5a, 5b are prevented in order to prevent the retaining plates 5a, 5b from forming a freezing action on the fixed rail 1, the intermediate rail 2 or the moving rail 3. It is preferably made of synthetic resin. Next, in the above-described slide rail unit, the intermediate rail 2 is formed by a pair of guides 2a and 2b formed in a rectangular shape to form a substantially S-shape, and when the intermediate rail 2 is considered as a beam, the second rail can be used. The secondary moment of inertia is set to be large, so the rigidity of the intermediate rail 2 with respect to bending and twisting becomes high. Further, the fixed rail 1 and the movable rail 3 are formed by a guide seat 2a, 2b having a substantially C-shaped cross section and covering the intermediate rail 2 from the outside, so that it is necessary to form a rectangle larger than the guide of the intermediate rail. . Therefore, for the fixed rail 1 and the moving rail 3, if the beam is taken as a consideration, the secondary inertia moment will also become large, and the rigidity with respect to bending and twisting will be changed. 4 and 5 are a schematic plan view and a side view showing the slide rail unit applied to a sliding member of a furniture drawer. In this example, the rail unit is disposed on both sides of the drawer 6. The above-mentioned moving rail 3 is fixed to the drawer 6, and on the other hand, the fixed rail 1 is fixed to the furniture body 7. In a state where the drawer 6 is housed in the furniture body 7, the fixed rail 1, the intermediate rail 2, and the moving rail 3 are overlapped, but when the drawer 6 is withdrawn from the furniture body 7, the moving rail 3 forms a movement to the intermediate rail 2, and On the one hand, the intermediate rail 2 forms a movement of the fixed rail 1 thereby supporting the movement of the drawer 6 as it is withdrawn from the furniture body 7. When the drawer 6 is drawn out from the furniture body 7, that is, in the state shown in Fig. 4 and 5-11 - 200803770 (8), when the article is stored in the drawer 6, the downward load is applied to the drawer 6. F, so that the pair of rail units arranged to sandwich the drawer 6 act to bend the front end of the moving rail 3 and the front end of the intermediate rail 2 downward, and in addition, The torque of the moving rail 3 pulled away from the intermediate rail 2 and the fixed rail 1. Therefore, when the rigidity of the fixed rail 1, the intermediate rail 2, and the moving rail 3 is low, bending deformation and distortion occur in the intermediate rail 2 and the moving rail 3, and the operation feeling when the drawer 6 is received in the furniture body 7 becomes heavy. . However, as described above, the slide rail unit of the present invention can provide the secondary moment of inertia of each of the rails 1, 2, and 3 to be large, and is formed into a rail having a high rigidity with respect to bending and twisting, so that even the drawer When the load F is actuated, the drawer 6 can be collected into the furniture body 7 while maintaining a light operational feeling. In the examples shown in Figs. 4 and 5, the slide rail units are fixed to the side surface of the drawer 6, but the moving rail 3 may be fixed to the bottom surface near the side surface. Next, Fig. 6 is a view showing a second embodiment of the slide rail unit to which the present invention is applied. The slide rail unit of the second embodiment is also assembled by the fixed rail 1 〇i, the intermediate rail 组装2 of the fixed rail 1 〇1 through the plurality of balls 4, and the intermediate rail 透过 by the plurality of balls 4移动2's moving track 1 〇3 is composed. However, the 'fixed rail 1 0 1 , the intermediate rail 1 〇 2 and the moving rail 1 〇 3 are formed by bending a metal sheet into a prescribed shape by a light rolling forming process, and balls 4 are formed at designated positions of the respective rails during the roll forming process. Roll away from the trench. That is, -12-200803770 Ο), the work of forming the rail into the specified shape and the work of forming the ball rolling groove are performed simultaneously, whereby the rails can be produced at low cost. First, the intermediate rail 102 is formed in a substantially S-shape by a combination of a pair of guides 102a and 1022b forming a rectangular shape. The intermediate rail 1 022 has a central wall 1 2 1 and a pair of side walls 1 2 2 and 1 2 2 formed by a groove formed by the central wall 1 2 1 on the outer side and the center of each side wall 1 2 2 Rolling grooves 1 2 3 of the balls 4 are formed on both sides of the wall 1 2 1 , respectively. The rolling grooves 123 are formed by bending a part of the central wall 12 1 and the side walls 122, and the rolling grooves 1 2 3 form a radius of curvature of the balls 4 having a diameter of about 5 5 6 6 6 %. . Then, the metal plate is forcibly bent so that the inner curved surface thereof becomes the rolling groove 123, and the surface hardness of the rolling groove 123 rises due to work hardening, so that the rolling groove 1 23 when the ball 4 is rolled becomes good wear resistance. The advantage of loss. On the other hand, the fixed rail 110 is formed in a substantially C-shaped cross section that can cover the guide 102a of the intermediate rail 102 from the outside, and has a side wall 1 formed to face each other with the guide 1 〇 2a interposed therebetween. 1 1, 1 1 2. Rolling grooves 1 1 3 of the balls 4 are formed on the inner sides of the side walls 1 1 1 and 1 1 2, and the balls 4 are rolling grooves 1 23 of the intermediate rail 1 〇 2 and rolling grooves of the fixed rail 1 0 1 113 is rolled while loading the load. The fixed rail is also formed by rolling a metal sheet by roll forming, and the above-described rolling groove 1 13 is formed during the processing. The radius of curvature of the rolling groove 1 1 3 is the same as the rolling groove 123 of the intermediate rail 102. Further, the fixed rail 1101 is provided with a mounting portion 141 having an L-shaped cross section perpendicular to the longitudinal direction of the fixed rail 1 〇 1 . This mounting-13-200803770 (10) portion 1 1 4 is formed by folding back the metal plate from the front end of one side wall 1 11 and sagging the flange portion 1 15 downward, and is provided with the side wall 1 1 1 into one. As a result of the fact that the mounting portion 1 14 is folded back from the front end of the side wall 11 1 , the side wall 11 1 and the mounting portion 1 1 4 are overlapped, and the rigidity of the side wall 11 1 is raised. In this way, when the intermediate rail 102 and the moving rail 103 are pulled out from the fixed rail 1 〇1, it is possible to prevent the pair of side walls 1 1 1 of the fixed rail 1〇1 from being unfavorable against the load and opening outward. . In addition, since the mounting portion 1 1 4 having a substantially L shape is integrally formed with the fixed rail 110, the rigidity of the fixed rail 10 1 itself is also increased, and the fixed rail 1 0 1 is hard to be twisted or bent. . In addition, the figure No. 1 16 is the fullness of the fixed rail 1 0 1 used when it is fixed to the furniture body or the like. Further, the moving rail 103 is formed in a substantially C-shaped cross section which can cover the guide 102b of the intermediate rail 102 from the outside, and has a pair of side walls which face each other with the guide 102b interposed therebetween! 3丨,;! 3 2. Rolling grooves 丨3 3 of the balls 4 are formed on the inner sides of the side walls 1 3 1 and 1 3 2 , and the balls 4 are rolling grooves 1 2 3 of the intermediate rail 1 〇 2 and rolling grooves of the moving rails 1 〇 3 The grooves 133 roll while being loaded with the load. The moving rail 103 is also formed by rolling a metal sheet by roll forming, and the above-described rolling groove 133 is formed during the processing. The radius of curvature of the rolling groove 133 is the same as the rolling groove 123 of the intermediate rail 102. Further, a mounting portion 134 formed by folding back the side wall 丨 3 1 from the front end of the moving rail 1 〇 3 is provided. As a result of the fact that the mounting portion 丨34 is folded back from the front end of the side wall 133, the side wall 133 and the mounting portion 丨34 are brought into a state in which the two sheets are overlapped, and the rigidity of the side wall 133 is raised. This is the same as the side wall 111 of the fixed rail 1 〇 i -14- 200803770 (11). Alternatively, the mounting portion 134 may be separately formed from the moving rail 10' and then integrated with the side wall 1 1 of the moving rail 3 by means of welding or the like. In addition, the gap between the guide 1 〇 2 a of the intermediate rail 1 〇 2 and the fixed rail 1 0 1 and the gap between the guide 1 0 2 2 b and the moving rail 1 〇 3 are respectively installed to make waves The beads 4 form a sequence of holding plates 1 〇 5 & 1 〇 5 b at specified intervals. Fig. 7 is a view showing a state of use of the slide rail unit of the second embodiment. Fig. 7 is a view showing an example in which the slide type storage unit 1 42 is supported by the refrigerator casing 14 1 . The fixed rail 1 0 1 is fixed to the inner side surface of the refrigerator casing 14 1 using a fixing bolt i 4 3 . An opening 1 44 is formed in the frame body 1 4 1 , and the hook 1 16 protruding from the fixed rail is inserted into the opening, so that the rail unit can be falsely fixed to the refrigerator casing 14 1 , which is easy to carry out. The locking work of the fixing bolt 143 described above. Further, since the fixed rail 〇1 is provided with the flange portion 1 15 protruding downward, even if the intermediate rail 2 and the moving rail 1 〇3 and the fixed rail 1 〇1 are in an overlapping state, the fixed rail 1 〇1 It can still be easily bolted to the refrigerator casing 14 1 . After the entire rail unit is fixed to the casing 141 as described above, the storage 142 is fixed to the moving rail 103 by using a fixing bolt 143. Since the slide rail unit is provided with a flat mounting portion 134 on the upper portion of the moving rail 103, the storage compartment 1 42 can be placed on the moving rail 103 from above, and the fixing bolt 1 43 can be used to lock the storage cabinet 1 without locking. 42 is supported on the moving rail 1 〇3. Therefore, the fixing work of the storage compartment 1 4 2 fixed to the moving rail 1 〇 3 can be easily performed. Next, in the slide rail unit of the second embodiment, the secondary moment of inertia of each of the rails -15-(12) (12) 200803770 1 0 1 , 102 , and 1 0 3 is also set to be large. Each of the rails has a high rigidity with respect to bending and twisting, so even if the downward load acts on the moving rail in the state in which the intermediate rail 102 and the moving rail 1 〇3 are sequentially pulled out from the fixed rail 110. At the same time, the original light operation feeling can be maintained, and the moving rail 103 and the intermediate rail 102 are incorporated into the fixed rail 1 〇1. Further, in the slide rail unit of the second embodiment, the fixed rail 1 〇1, the intermediate rail 102, and the movable rail 103 are formed by roll forming, and are formed by processing each rail into a predetermined shape. Since the rolling grooves of the balls are extremely high in productivity compared with the case where the rolling grooves are formed by another work, the slide rail unit can be produced at low cost. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment of a slide rail unit according to the present invention. Fig. 2 is a front elevational view of the slide rail unit shown in Fig. 1. Figure 3 is a front elevational view showing the intermediate rail. Fig. 4 is a schematic plan view showing an application example when the slide sliding mechanism is applied to the drawer slide mechanism. Fig. 5 is a schematic side view showing an application example when the slide sliding mechanism is applied to the slide sliding mechanism. Fig. 6 is a front view showing a second embodiment of the slide rail unit of the present invention. Fig. 7 is a front view showing a mounting example of the slide rail unit according to the second embodiment. -16-037037 (13) [Main component symbol description 1: Fixed Rail 2: intermediate rail 2a, 2b: guide 3: moving rail 4: ball