(1) 1265116 玖、發明說明 【發明所屬之技術領域】 本發明是有關使車輛上昇用的車輛維修用昇降機’特 別是一種即使是操作伸縮動作連桿機構而昇降動作的昇降 機，上昇昇降機時也可將溝槽整體完全平坦地閉塞的車輛 維修用昇降機。 【先前技術】 在昇降機下降時昇降機本體是被收納於地下，車載台 是對於地面成爲平面的車輛維修用昇降機，不但可有效利 用作業空間，且因爲可將低底盤車輛平順地抬起（上昇）， 所以廣泛地被利用。 這種昇降機，是使昇降機本體被容納在凹設於地上的 溝槽內，當抬下（下降）時藉由車載台閉塞溝槽而可以變得 平坦，但是在抬起狀態下，溝槽是露出的狀態，從作業性 或安全的考慮，有必要設法閉塞此凹部。 這種昇降機，已知如專利文獻1或是專利文獻2的結構 ’在專利文獻1中設置溝漕內供閉塞溝槽用的蓋板，當載 置車輛的車載台上昇時，蓋板是由捲簧推迫而上昇，來閉 塞溝槽的結構。 且，在專利文獻2中，將連結容納具備一對的平行的 車載台的昇降機的左右的車載台的溝槽，由在溝槽內昇降 動作的載置台所閉塞。 [專利文獻1]日本特開平10 _4 4945號公報 (2) 1265116 [專利文獻2]日本專利第3 3 73 3 93號公報 【發明內容】 (本發明所欲解決的課題） 但是，揭示於上述專利文獻1的昇降機，雖可以由簡 易的構造閉塞溝槽，但是在昇降機下部因爲藉由垂直設置 汽缸（滑閥）來昇降動作昇降機，所以需要供埋設汽缸用的 深溝槽，除了設置於地上的溝槽以外必需形成更深的凹部 〇 且，揭示於專利文獻2的昇降機，昇降機的昇降動作 因爲是藉由X型連桿機構所進行，凹部的形成雖是只要 可收納昇降機的溝槽即可，但是昇降機上昇後的溝槽完全 地閉塞是很難，連桿機構形成部仍是呈開放狀態。 在此，本發明有鑑於上述問題點，其目的是提供一種 即使是藉由X型等的連桿機構進行昇降動作的昇降機， 當上昇昇降機時也可將溝槽整體平坦地閉塞的車輛維修用 昇降機。 (用以解決課題的手段） 爲解決上述課題，申請專利範圍第1項的發明，是一 種車輛維修用昇降機，是使車載台，藉由設在朝其下方的 昇降機昇降手段而昇降動作，當下降時使前述車載台的載 置面成爲與地面略同一面的方式，容納前述昇降機昇降手 段於凹設在地上的溝槽內的車輛維修用昇降機，其特徵爲 -5- (3) 1265116 :前述昇降機昇降手段’是由下昇降手段及上昇降手段的 上下2段形成，在下昇降手段的上部設置閉塞前述溝槽用 的蓋板，將上昇降手段配置於該蓋板上的同時將車載台設 置在其上部，藉由下昇降手段上昇前述蓋板，來閉塞溝槽 開口面。 依據此車輛維修用昇降機，分別將昇降機昇降手段在 上下設置，藉由下昇降手段的作用宛如使溝槽底面可上昇 地上昇蓋板，即使將車載台上昇的抬起狀態，也可將溝槽 整體良好地閉塞。 且，因爲分別將昇降機昇降手段設成2段，所以抬起 操作時最先將蓋板上昇，抬下操作時先將上昇降手段下降 後再下降蓋板的話，可隨時在閉塞溝槽的狀態下進行操作 ，就不會無意地讓工具或零件等掉入溝槽內。 申請專利範圍第2項的發明，如申請專利範圍第1項的 發明，其中，上昇降手段，是由上下伸縮的連桿機構所構 成。藉由此結構，將使車載台昇降動作的上昇降手段完全 形成於蓋板上，而可使溝槽較淺。且，在上昇車載台的狀 態下也可以完全地閉塞溝槽。 申請專利範圍第3項的發明，如申請專利範圍第1或2 項的發明，其中，當上昇車載台時最先使下昇降手段進行 上昇動作，當下降車載台時最先使上昇降手段進行下降動 作。藉由其結構，除了抬起狀態之外，即使是昇降動作中 也可以保持閉塞溝槽的狀態，因爲可以隨時閉塞溝槽而不 會無意地讓工具等或零件等掉入溝槽內。 -6 - (4) 1265116 申請專利範圍第4項的發明，如申請專利範圍第1、2 或3項的發明，其中，車載台、昇降機昇降手段、溝槽、 蓋板的全部爲左右一對配置並可與昇降動作連動，將車輛 的左右的車輪分別載置於前述左右一對的車載台來進行昇 降動作。藉由此結構，在抬起時，因爲在車輛的下部橫跨 前後方在中央空出可以作業的空間，所以車輛的維修作業 容易進行。 【實施方式】 以下，將本發明具體化的實施例，依據圖面詳細說明 。第1圖是顯示本發明的車輛維修用昇降機（以下，只稱昇 降機）的一例的側面說明圖，前側側板等省略。在圖中，1 是載置車輛的車載台，2是昇降動作車載台1的昇降機昇降 手段，3是容納昇降機用的形成於地上5的溝槽，4是在昇 降機上昇時供閉塞溝槽3用的蓋板。 昇降機昇降手段2，是形成：在溝槽3內昇降動作的下 部昇降機2a、及在其上部昇降動作的上部昇降機2b的2段 。而且，蓋板4是設置於下部昇降機2a上，上部昇降機2b 是組裝於盍板4上，車載台1是形成於上部昇降機2b上。 如此，車載台1主要是藉由上部昇降機2b進行昇降動作。 X型連桿8，是在下部、上部一同使一端（圖示左端） 軸固於基台7及蓋板4，他端是可滑動於基台7上或是蓋板4 的下面。支柱9，是在圖示前後各設有！對的方式共設有4 處’下端是朝圖示左右方向可旋轉地軸固在基台7上，上 (5) 1265116 端是同樣地朝圖示左右方向可旋轉地軸固在蓋板4。 而且，在圖示右側的支柱9的下支柱9b的側部是固定 有供連結第1汽缸1〇用的連結片12，而與第1汽缸10的先端 連結。第1汽缸10的基部是與基台7連結，藉由第1汽缸1〇 的伸縮動作並透過連結片12使下支柱9b進行立起或是傾 倒動作，並使支柱9進行立起或是曲折傾倒的結構。 且，左右的支柱9、9的曲折軸9a彼此是由同調棒13 連結、連動的結構，朝前後（圖面背面方向）配置的支柱9 的曲折軸9a彼此也相互連結。 如此，藉由第1汽缸1〇的伸縮動作’ 4個支柱9連動而 進行立起及曲折傾倒動作，藉由X型連桿8的作用使蓋板 4朝上下方向平行移動。其結果，蓋板4是在溝槽3內進行 昇降動作。 上部昇降機2b，是由朝上下方向起倒的X型連桿1 5 、及先端被連結在蓋板4且基端被連結在X型連桿1 5的腕 體所構成，被設置於X型連桿15上的車載台1是由X型連 桿1 5的作用而在蓋板4上平行昇降動作。 而且，蓋板4及車載台1是形成與溝槽3的開口部略同 一形狀，抬起動作在完了的狀態下，蓋板4的上面是成爲 與地面同一面的方式構成下部昇降機2a。 如此，因爲是以蓋板4爲界境將昇降機昇降手段2分別 設置，所以蓋板，是不需要設置供插通昇降手段的開口部 或收容昇降手段的突起或是凹部，就可將溝槽3的全面無 間隙地覆蓋，並可使上面平坦。其結果’可宛如溝槽底面 -8 - (6) 1265116 上昇的方式上昇蓋板，即使將車載台上昇的抬起的狀態下 也可將溝槽整體良好平坦地閉塞。 第2圖，是從將第1圖的車載台1上昇至最上位置的抬 起狀態，容納至溝槽3爲止的昇降機的狀態的說明圖，第2 圖（a)，是顯示中途，即將下部昇降機2上昇的狀態下將上 部昇降機2b下降至中途爲止的狀態，第2圖（b)是顯示將下 部昇降機2a上昇的狀態下將上部昇降機2b完全下降的狀 態，第2圖（〇是顯示下部昇降機2a也完全下降，並完成抬 下的狀態。 如此，即使是容納昇降機的狀態，也與蓋板4同樣藉 由形成與溝槽3略同一形狀的車載台1使溝槽3閉塞，且因 爲下部昇降機、上部昇降機皆是由連桿機構形成，在淺淺 地形成的溝槽內可將昇降機昇降手段良好地容納。 第3圖，是顯示由第1圖的昇降機來驅動如第7圖的平 面圖所示的左右並列形成的昇降機的左右一對的第1汽缸 10、10及左右一對的第2汽缸16、16的油壓管路。且，第4 圖、第5圖是其顯示動作流程。藉由如此左右一對並列， 將車載台左右分離配置，可在中央確保橫跨前後的寬的作 業空間。 如第3圖所示，下部昇降機2a及上部昇降機2b是分別 藉由第1電磁閥18及第2電磁閥19控制，從油槽筒20藉由泵 21汲起的油是供給至雙方的電磁閥18、19。且，一對的第 1汽缸10、10及一對的第2汽缸16、16是分別呈直列連接， 左右的昇降機是相互連動動作。 -9 - (7) 1265116 且，22是昇降機下降將控制用的第3電磁閥，23是節 流閥。且，在第4圖、第5圖中，LSI是下部昇降機2a爲最 上限狀態時動作的限位開關，被設在第1汽缸10，LS2是上 部昇降機2b爲最下限狀態時動作的限位開關，LS2是裝設 於第2汽缸16。且，在第7圖中，26是放置於車載台的車輛 〇 接著，說明這些電磁閥的動作程序。首先，昇降機的 上昇，是如第4圖所示，按壓另外設置的操作部（無圖示） 的昇降機上昇按鈕（S1)。這時，判斷第1限位開關LSI是 否爲動作狀態（S2)，若爲動作狀態（下部昇降機2a若是上 昇至上限位置），進入 S3並動作第2電磁閥19(SOL2)。未 動作的話進入 S5並動作第1電磁閥18(S0L1)。若第1電磁 閥18或是第2電磁閥19動作的話，進入S4或是S6，並使泵 21動作而使油槽筒20的油供給至第1汽缸10、第2汽缸16。 如此，進行昇降機的上昇操作，昇降機是容納於溝槽 3的狀態下，由最初的昇降機上昇操作使下部昇降機2a動 作來上昇蓋板4，並由第2次的昇降機上昇操作使上部昇降 機2b動作而使車載台1抬起至最上位置。 昇降機的下降，是如第5圖所示，按壓操作部的昇降 機下降按鈕（S11)。這時，第2限位開關LS2若爲動作狀態（ 上部昇降機2b若是下降至下限狀態），進入S13並動作第1 電磁閥18。若未動作的話進入成Si5並動作第2電磁閥19 。第1電磁閥18或是第2電磁閥19若是動作的話，進入S14 或是S16，動作第3電磁閥22(SOL3)而使第1汽缸1〇、第2 -10- (8) 1265116 汽缸16內的油回收操作至油槽筒20。 如此，昇降機的下降操作是被進行，下部昇降機2a 及上部昇降機2b爲上昇狀態時，由最初的昇降機下降操 作使上部昇降機2b動作而下降車載台1。由第2次的昇降 機下降操作使下部昇降機2a動作，而使昇降機下降至最 下位置而被容納於溝槽3內。 如此，藉由將昇降機昇降手段分別設成上下2段’當 抬起操作時是最初上昇蓋板4，抬下操作時是先下降上昇 降手段後將蓋板4下降，抬起狀態之外，即使是昇降動作 中也可以保持閉塞溝槽3的狀態，隨時閉塞溝槽3。因此’ 不會無意地讓工具等或零件等倒入溝槽內，也不會讓作業 者的腳滑入溝槽內。 且，抬起操作及抬下操作皆只需1次的按鈕操作。 第6圖是顯示本發明的昇降機的其他例的側面說明圖 ，與上述第1圖的實施例是在下部昇降機2a的結構有所不 同。且，與第1圖同樣的構成構件，附與同一符號，省略 說明。下部昇降機2 a，是採用將X型連桿8如圖示朝左右 方向1對設置，分別將汽缸25驅動伸縮的構造。此情況， 上述第1圖的形態相比汽缸數量雖是較多，但是構造簡単 〇 且，上述昇降機，雖是顯示如第7圖所示朝前後長型 形成的一對平行的形態，但將左右的昇降機一體形成並將 車載台由1枚的板形成也可以。此情況，藉由在中央設置 作業用的開口部，就可與一對平行配置的形態同樣可從下 -11 - (9) 1265116 方容易進行車輛維修。 且’設成一對平行的情況時，雖也可形成將左右的昇 降機由樑連結連動的結構，但是該情況需要供容納樑用的 溝槽’會使結構複雜’最好是連動油壓管路的結構。 進一步’雖將上部昇降機的連桿機構作成X型連桿 ，但是其他的連桿機構，使用例如λ型連桿也可以。且， 下部昇降機非連桿機構，而是例如將汽缸立設成垂直也佳 ’但上部昇降機若是由連桿機構構成的話，可以使溝槽較 淺地形成。 (發明之效果） 如上述’依據本發明，因爲分別將昇降機昇降手段在 上下設置’所以藉由下昇降手段的作用宛如使溝槽底面可 上昇地上昇蓋板，即使將車載台上昇的抬起狀態，也可將 溝槽整體良好地閉塞。 且，藉由抬起操作時最先將蓋板上昇，抬下操作時先 將上昇降手段下降後再下降蓋板的話，可隨時在閉塞溝槽 的狀態下進行操作，就不會無意地讓工具或零件等掉入溝 槽內，也不會讓作業者的腳滑入溝槽內。 【圖式簡單說明】 [第1圖]本發明的車輛維修用昇降機的上昇狀態的側 面說明圖。 [第2圖]顯示第1圖的車輛維修用昇降機的其他的狀態 -12- (10) 1265116 ，（a)是下降上部昇降機的中途的狀態，（b)是上部昇降機 完全下降的狀態，（Ο是上部昇降機之外下部昇降機也下 降的狀態。 [第3圖]第1圖的昇降機的油壓管路圖。 [第4圖]第3圖的油壓管路的昇降機上昇動作的流程圖 〇 [第5圖]第3圖的油壓管路的昇降機下降動作的流程圖 〇 [第6圖]顯示本發明的其他例的車輛維修用昇降機的 側面說明圖。 [第7圖]第1圖的車輛維修用昇降機的平面圖。 [圖號說明] LSI 第1限位開關 LS2 第2限位開關 1 車載台 2 昇降機昇降手段 2a 下部昇降機 2b 上部昇降機 3 溝槽 4 蓋板 5 底 7 基台 8 X型連桿 -13- (11) (11)1265116 9 支柱 9a 曲折軸 9b 下支柱 10 第1汽缸 12 連結片 1 3 同調棒 15 X型連桿 16 第2汽缸 18 第1電磁閥 19 第2電磁閥 20 油槽筒 2 1 泵 22 第3電磁閥 25 汽缸(1) 1265116 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' A vehicle maintenance elevator that can completely occlude the entire groove. [Prior Art] When the elevator is lowered, the elevator body is housed in the underground. The vehicle is a vehicle maintenance elevator that is flat on the ground. Not only can the working space be used effectively, but also the low-floor vehicle can be lifted smoothly (rise). , so it is widely used. The elevator is such that the elevator body is housed in a groove recessed in the ground, and can be flattened when the vehicle is hoisted by the vehicle platform when being lifted (dropped), but in the raised state, the groove is In the exposed state, it is necessary to try to close the recess from the viewpoint of workability or safety. In the lifter, the structure of the patent document 1 or the patent document 2 is known. In the patent document 1, the cover for the occlusion groove is provided in the groove, and when the vehicle mounted on the vehicle is raised, the cover is The coil spring is pushed up to rise to block the structure of the groove. Further, in Patent Document 2, a groove for connecting the left and right vehicle-mounted stages of the elevator that houses the pair of parallel vehicle-mounted stages is closed by a mounting table that moves up and down in the groove. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. In the elevator of Patent Document 1, the groove can be closed by a simple structure. However, since the elevator is lifted and lowered by vertically providing a cylinder (spool valve) in the lower portion of the elevator, a deep groove for burying the cylinder is required, except for being placed on the ground. Further, it is necessary to form a deeper recessed portion in addition to the groove. Further, in the elevator of Patent Document 2, the lifting operation of the elevator is performed by the X-shaped link mechanism, and the formation of the recessed portion is only required to accommodate the groove of the elevator. However, it is difficult to completely occlude the groove after the lift is raised, and the link mechanism forming portion is still in an open state. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle for maintenance of a vehicle that can smoothly close the entire groove even when the elevator is lifted by an elevator that is moved up and down by a link mechanism such as an X-type. elevator. (Means for Solving the Problem) In order to solve the above problems, the invention of claim 1 is an elevator for vehicle maintenance, which is configured such that the vehicle is lifted and lowered by means of an elevator lifting device provided below the vehicle. The vehicle maintenance surface lifter that accommodates the mounting surface of the vehicle-mounted platform so as to be slightly flush with the ground, and accommodates the elevator lifting/lowering means in a groove recessed in the ground, and is characterized by -5-(3) 1265116 : The elevator lifting and lowering means 'is formed by the lower and lower stages of the lower lifting means and the upper lifting means. The upper part of the lower lifting means is provided with a cover for closing the groove, and the upper lifting means is disposed on the cover while the vehicle is placed. It is disposed at the upper portion thereof, and the opening plate is raised by the lower lifting means to close the opening surface of the groove. According to the vehicle maintenance elevator, the elevator lifting and lowering means are respectively disposed above and below, and the lower lifting means functions as if the bottom surface of the groove can be raised and raised, and the groove can be raised even if the vehicle is raised and raised. The whole is well occluded. Moreover, since the elevator lifting and lowering means are respectively set to two stages, the lifting of the cover is first performed when the lifting operation is performed, and when the lifting and lowering means is lowered first and then the lowering of the cover is carried out during the lifting operation, the state of the groove can be closed at any time. Under the operation, the tool or part or the like is not inadvertently dropped into the groove. The invention of claim 2 is the invention of claim 1, wherein the upper lifting means is constituted by a link mechanism that expands and contracts up and down. With this configuration, the upper lifting means for raising and lowering the vehicle is completely formed on the cover, and the groove can be made shallow. Further, the groove can be completely closed in the state of raising the vehicle. The invention of claim 3 is the invention of claim 1 or 2, wherein when the vehicle is raised, the lower lifting means is first raised, and when the vehicle is lowered, the lifting means is first performed. Falling action. With its configuration, in addition to the raised state, the state of the occluding groove can be maintained even in the lifting operation, because the groove can be closed at any time without inadvertently dropping a tool or the like into a groove. -6 - (4) 1265116 The invention of claim 4 is the invention of claim 1, wherein the vehicle-mounted platform, the elevator lifting means, the groove, and the cover are all left and right. The arrangement can be carried out in conjunction with the lifting operation, and the left and right wheels of the vehicle are respectively placed on the pair of left and right vehicle-mounted stations to perform the lifting operation. With this configuration, at the time of lifting, since the space available for work can be vacated in the center across the front and rear of the vehicle, the maintenance work of the vehicle can be easily performed. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a side explanatory view showing an example of a vehicle maintenance elevator (hereinafter simply referred to as a lifter) of the present invention, and a front side panel or the like is omitted. In the drawing, 1 is a vehicle-mounted platform on which a vehicle is placed, 2 is an elevator lifting and lowering means for lifting and lowering the vehicle-mounted platform 1, 3 is a groove for accommodating the elevator for forming the ground 5, and 4 is for clogging the groove 3 when the elevator is raised. Used cover. The elevator lifting and lowering means 2 is formed in two stages of a lower elevator 2a that moves up and down in the groove 3 and an upper elevator 2b that moves up and down in the upper portion. Further, the cover 4 is provided on the lower lift 2a, the upper lift 2b is assembled on the seesaw 4, and the fixed mount 1 is formed on the upper lift 2b. In this manner, the vehicle-mounted station 1 mainly performs the lifting operation by the upper elevator 2b. The X-shaped connecting rod 8 is fixed to the base 7 and the cover 4 at the lower end and the upper portion together with one end (the left end of the drawing), and the other end is slidable on the base 7 or under the cover 4. Pillars 9 are provided before and after the illustration! A total of four places are provided. The lower end is rotatably fixed to the base 7 in the left-right direction of the figure, and the upper (5) 1265116 end is rotatably axially fixed to the cover 4 in the left-right direction of the figure. Further, a connecting piece 12 for connecting the first cylinder 1 is fixed to a side portion of the lower pillar 9b of the pillar 9 on the right side of the figure, and is coupled to the tip end of the first cylinder 10. The base of the first cylinder 10 is coupled to the base 7, and the lower leg 9b is lifted or tilted by the expansion and contraction operation of the first cylinder 1 through the connecting piece 12, and the pillar 9 is raised or bent. Dumped structure. Further, the meandering shafts 9a of the left and right pillars 9 and 9 are connected to each other by the homomorphic rods 13, and the meandering shafts 9a of the pillars 9 disposed in the front-rear direction (the direction of the back surface of the drawing) are also connected to each other. In this manner, the four pillars 9 of the first cylinder 1〇 are interlocked to perform the upright and the tortuous tilting operation, and the cover 4 is moved in the vertical direction by the action of the X-shaped link 8. As a result, the cover 4 is lifted and lowered in the groove 3. The upper elevator 2b is composed of an X-shaped link 15 that is inverted in the up-and-down direction, and a wrist that is connected to the cover 4 at the distal end and is coupled to the X-link 15 at the proximal end, and is provided in the X-shape. The vehicle-mounted table 1 on the link 15 is moved up and down in parallel on the cover 4 by the action of the X-shaped link 15. Further, the cover 4 and the vehicle 1 are formed in a shape similar to the opening of the groove 3, and the lower lift 2a is configured such that the upper surface of the cover 4 is flush with the ground in a state where the lifting operation is completed. In this manner, since the elevator lifting/lowering means 2 is separately provided with the cover 4 as a boundary, the cover can be provided with an opening for inserting the lifting means or a projection or recess for accommodating the lifting means. The cover of 3 is completely covered without gaps and can be flattened. As a result, the cover can be raised as if the groove bottom surface -8 - (6) 1265116 is raised, and the entire groove can be smoothly closed even when the vehicle stage is raised and raised. 2 is an explanatory view of a state in which the elevator is accommodated in the lifted state in which the vehicle-mounted table 1 of FIG. 1 is raised to the uppermost position, and is accommodated in the groove 3, and FIG. 2(a) is the middle of the display, that is, the lower portion In the state where the elevator 2 is raised, the upper elevator 2b is lowered to the middle, and the second diagram (b) is a state in which the upper elevator 2b is completely lowered in a state where the lower elevator 2a is raised, and FIG. 2 (the lower part is shown) The elevator 2a is also completely lowered and is in the lowered state. Thus, even in the state in which the elevator is accommodated, the groove 3 is closed by the vehicle-mounted table 1 having the same shape as the groove 3, similarly to the cover 4, and because Both the lower elevator and the upper elevator are formed by a link mechanism, and the elevator lifting means can be well accommodated in the shallowly formed groove. Fig. 3 is a view showing the elevator of Fig. 1 driven as shown in Fig. 7. The hydraulic cylinders of the pair of left and right first cylinders 10 and 10 and the pair of left and right second cylinders 16 and 16 of the elevator which are formed side by side in the plan view, and the fourth and fifth figures show the operation. Process. The pair of left and right sides are arranged side by side, and the left and right sides of the vehicle are separated from each other to ensure a wide working space across the front and rear. As shown in Fig. 3, the lower lifter 2a and the upper lifter 2b are respectively provided by the first electromagnetic valve 18 and The second electromagnetic valve 19 controls the oil that is pumped from the oil sump 20 by the pump 21 to be supplied to both of the electromagnetic valves 18 and 19. The pair of first cylinders 10 and 10 and the pair of second cylinders 16 16 is connected in series, and the left and right elevators are interlocked with each other. -9 - (7) 1265116, 22 is the third solenoid valve for the elevator to lower the control, and 23 is the throttle valve. In the fifth diagram, the LSI is a limit switch that operates when the lower elevator 2a is in the uppermost limit state, and is provided in the first cylinder 10, and LS2 is a limit switch that operates when the upper elevator 2b is in the lowest limit state, and LS2 is installed in In the seventh figure, reference numeral 26 denotes a vehicle placed on the vehicle-mounted platform. Next, the operation procedure of these solenoid valves will be described. First, the lift of the elevator is as shown in Fig. 4, and the press is additionally provided. Lift up button (S1) of the operation unit (not shown). It is determined whether or not the first limit switch LSI is in the operating state (S2), and if it is in the operating state (if the lower lift 2a is raised to the upper limit position), the process proceeds to S3 and the second electromagnetic valve 19 (SOL2) is operated. If the operation is not performed, the process proceeds to S5. When the first electromagnetic valve 18 or the second electromagnetic valve 19 is actuated, the process proceeds to S4 or S6, and the pump 21 is operated to supply the oil of the oil sump 20 to the first cylinder 10 In the second cylinder 16 as described above, the elevator is lifted up, and the elevator is housed in the groove 3. The lower lift 2a is operated by the first lift up operation to raise the cover 4, and the lift is raised by the second lift. The operation causes the upper elevator 2b to operate to raise the vehicle platform 1 to the uppermost position. The lowering of the elevator is as shown in Fig. 5, and the elevator lowering button of the operation unit is pressed (S11). At this time, if the second limit switch LS2 is in the operating state (if the upper elevator 2b is lowered to the lower limit state), the process proceeds to S13 and the first electromagnetic valve 18 is operated. If it is not operated, it enters Si5 and operates the second electromagnetic valve 19. When the first electromagnetic valve 18 or the second electromagnetic valve 19 is operated, the process proceeds to S14 or S16, and the third electromagnetic valve 22 (SOL3) is operated to make the first cylinder 1〇 and the second-10-(8) 1265116 cylinder 16 The oil recovery inside is operated to the oil sump 20 . In this manner, when the lower elevator 2a and the upper elevator 2b are in the ascending state, the upper elevator 2b is operated by the first elevator lowering operation to lower the vehicle 1 . The lower elevator 2a is operated by the second lowering operation of the elevator, and the elevator is lowered to the lowest position and housed in the groove 3. In this way, the elevator lifting means is respectively set to the upper and lower sections. 'When the lifting operation is the first ascending cover 4, the lifting operation is performed by lowering the lifting means first and then lowering the cover 4, and lifting the state. Even in the lifting operation, the state in which the groove 3 is closed can be maintained, and the groove 3 can be closed at any time. Therefore, it does not inadvertently pour tools, parts, etc. into the grooves, and does not allow the operator's feet to slide into the grooves. Moreover, the lifting operation and the lifting operation all require only one button operation. Fig. 6 is a side explanatory view showing another example of the elevator of the present invention, and the embodiment of the first embodiment differs in the configuration of the lower elevator 2a. The same components as those in Fig. 1 are denoted by the same reference numerals and will not be described. The lower elevator 2a has a structure in which the X-shaped links 8 are provided in a pair in the left-right direction as shown in the drawing, and the cylinders 25 are respectively driven to expand and contract. In this case, although the form of the first figure is larger than the number of cylinders, the structure is simple, and the elevator is a pair of parallel forms formed in a front-rear length as shown in FIG. The left and right elevators may be integrally formed, and the vehicle platform may be formed of one plate. In this case, by providing the opening for the work in the center, the vehicle can be easily repaired from the lower -11 - (9) 1265116 in the same manner as the pair of parallel arrangements. In the case where the pair is arranged in a parallel manner, a structure in which the left and right elevators are linked by the beam may be formed. However, in this case, it is necessary to accommodate the beam for the beam, which makes the structure complicated, and it is preferable to interlock the oil pressure pipe. The structure of the road. Further, although the link mechanism of the upper elevator is formed as an X-shaped link, other link mechanisms may be, for example, a λ-type link. Further, the lower lifter is not a link mechanism, but for example, the cylinder is erected vertically. However, if the upper lifter is constituted by a link mechanism, the groove can be formed shallow. (Effects of the Invention) As described above, according to the present invention, since the elevator lifting and lowering means are respectively disposed above and below, the lower lifting means acts as if the bottom surface of the groove can be raised and raised, even if the vehicle is raised up. In the state, the groove as a whole can also be well occluded. Moreover, when the lifting operation is performed, the cover plate is first raised, and when the lifting operation is performed, the upper lifting and lowering means is lowered first, and then the lowering of the cover plate is performed, so that the operation can be performed at the time of closing the groove, and the operation is not inadvertently allowed. Tools or parts, etc., fall into the grooves and do not allow the operator's feet to slide into the grooves. [Brief Description of the Drawings] [Fig. 1] is a side elevational view showing the ascending state of the vehicle maintenance elevator of the present invention. [Fig. 2] Another state -12-(10) 1265116 of the vehicle maintenance elevator of Fig. 1 is shown, (a) is a state in which the upper elevator is lowered, and (b) is a state in which the upper elevator is completely lowered. Ο is a state in which the lower elevator is lower than the upper elevator. [Fig. 3] Hydraulic piping diagram of the elevator of Fig. 1. [Fig. 4] Flowchart of the ascending operation of the hydraulic piping of Fig. 3第 [Fig. 5] Flowchart of the elevator lowering operation of the hydraulic line of Fig. 3 [Fig. 6] A side view of the elevator for vehicle maintenance according to another example of the present invention is shown. [Fig. 7] A plan view of the elevator for vehicle maintenance. [Illustration] LSI 1st limit switch LS2 2nd limit switch 1 Vehicle stage 2 Lift lift 2a Lower lift 2b Upper lift 3 Groove 4 Cover 5 Bottom 7 Base 8 X-shaped connecting rod-13- (11) (11) 1265116 9 Pillar 9a Zigzag shaft 9b Lower strut 10 First cylinder 12 Connecting piece 1 3 Coherent rod 15 X-shaped connecting rod No. 2 cylinder 18 First solenoid valve 19 2 solenoid valve 20 oil tank 2 1 pump 22 3rd solenoid valve 25 cylinder