522106 A7 B7 五、發明説明（1 ) 【發明所屬之技術領域】 (請先閲讀背面之注意事項再填寫本頁) 本發明’係有關一種伸縮式之搖臂被具備於車輛維修 用昇降機，可昇降移動及以任意高度可水平轉動，在前端 使具有車輛承載台之滑動臂，被構成以自由拉出/拉入進行 嵌入於筒狀之昇降臂內。 【先前之技術】 車輛維修用昇降機，係將被設於搖臂前端之車輛承載 .台對車輛之昇降轉轍點極快而且必須正確位置合對，所以 在位置合對時係在搖臂被要求順暢的伸縮操作。 因此，伸縮式之搖臂，係用以低摩擦處理擦動面，或 僅使滾筒進行介在等用以提高操作性係簡單的搖臂，在昇 降臂中由嚴禁引起偏移，所以使位置合對以外時之滑動臂 的操作性之優異性反而成爲負面。 因此，要使此等相互形成相反關係之功能並存係相當 的困難。 經濟部智慧財產局員工消費合作社印製 因此，僅安裝滾筒或實施低摩擦處理時，無滑動臂之 位置偏移防止機構則會有不安。 【發明所欲解決之問題】 將滑動臂之位置偏移防止機構在昇降機上昇之直前或 昇降機下降之直後要——進行操作係相當麻煩，並不敢斷 言不會忘記操作。 而且若使滑動臂之位置偏移防止機構形成另外設置， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐) ' — 522106 A7 ______ B7 _ 五、發明説明（2 ) 則影響到裝置全體之價格，也形成干擾的存在。 (請先閱讀背面之注意事項再填寫本頁) 因此本發明，其目的係提供一種搖臂在位置合對時可 順暢進行操作，在昇降機上昇時係自動使滑動臂之位置偏 移防止功能產生作用，即使省略位置偏移防止機構也可確 保信賴性。 【解決問題之手段】 爲了用以達成上述之目的，本發明之搖臂，係在昇降 臂之前端底面及滑動臂之基端上面分別用以形成凹並 在其凹部形成部，將使表面突出於凹部外之低摩擦^^^構 件，在前述凹部內安裝成可壓入及自動復位，同時 滑動臂之基端下面設置摩擦力減低裝置，及在昇降臂之前 端底面以及滑動臂之基端上面分別用以形成穿孔用以貫通 凹部或板面，並在此等凹部或穿孔，將鋼球滑閥僅使鋼球 由各形成面之水平使嵌裝成頭出之狀態，同時在前述滑動 臂之基端下面設置摩擦力減低裝置。 經濟部智慧財產局員工消費合作社印製 而且此等之搖臂中，係用以高摩擦處理在昇降臂之前 端底面及滑動臂之基端上面中理低摩擦構件或鋼球之突出 部周圍爲較佳，摩擦力減低裝置，係藉由將低摩擦擦動構 件之表面安裝成比下端面之水平更露出之狀態下被實現。 【發明之實施形態】 以下，對於有關本發明之車輛維修用昇降機之搖臂根 據圖式加以說明。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） Γ5Τ ' 經濟部智慧財產局員工消費合作社印製 522106 A7 _ B7____ 五'發明説明（3 ) 圖1係顯示搖臂1之剖面圖，該搖臂1，係如圖5所示， 沿著支柱2、2對昇降移動之承載架3，通過被安裝於基端部 之托座4、4及銷5、5，以任意高度被安裝成自由水平轉動 ，並在前端係形成具備車輛承載台6、6。 又該搖臂1，係以筒狀之昇降臂1 a，及在該昇降臂la內 被嵌入成自由擦動之滑動臂lb以自由伸縮被構成，在昇降 臂la及滑動臂lb之相互間係被容許若干之間隙，並以被形 成於滑動臂1 b之基端部上面的高台部分7，及被安裝於昇降 臂la之前端上部內面的卡止構件8被達成防止脫落。 在碰到前述滑動臂lb之基端上面的高台部分7及昇降臂 la之前端內底面係分別被形成有凹部9、9，在此等之凹部9 、9，係通過被埋設於各凹部9 、9內之彈性體10、10並使 表面突出於凹部9、9外之低摩擦擦動構件11、11，在前述 凹部9、9內被安裝成可壓入及自動復位。 又，在前述滑動臂lb之基端下面，係做爲摩擦力減低 裝置，並將比下端面之水平更低的低摩擦擦動構件11a之表 面被安裝成經常露出之狀態。 進而，在昇降臂la之前端底面及滑動臂lb之基端上面 中的低摩擦擦動構件1 1、1 1之突出部周圍，係被實施滑止 效果高的滾花加工等之高摩擦處理。 如此被形成之搖臂1，係在車輛承載台6不加負載位置 合對之時點，即在車輛承載台6使車輛之負載未進行作用時 (以下稱爲無負載時），係如圖2所示，昇降臂1 a及滑動臂 lb ’係通過滑動臂lb基端之上下各面的低摩擦擦動構件11 本紙張尺度適用中國國家標準（CNS ) M規格（210X297公釐） _ 6 _ m' i HI :i I-I-广·· I I Hi - - ....... ...... - I ..... i - -I.- : - - -- - -- i (請先閱讀背面之注意事項再填寫本頁) 522106 A7 B7___ 五、發明説明（4 ) (請先閱讀背面之注意事項再填寫本頁) 、11a及昇降臂la前端內定面之低摩擦擦動構件Π並進行接 觸，在車輛承載台6使車輛之負載在進行作用之昇降機上昇 時（以下稱爲負載時），係使彈性體10、10被壓縮並使低 摩擦擦動構件11、11被壓入於凹部9內，而滑動臂lb係對昇 降臂1 a使被高摩擦處理之面進行接觸。 藉此滑動臂1 a，係在無負載時與昇降臂1 a使擦動摩擦 抵抗幾乎不產生所以在其伸縮操作所要之力量很小可完成 ，以順暢可拉出/壓入操作，在負載時相反與昇降臂在相 互間產生大的摩擦抵抗，使位置偏移防止狀態被維持。 於此，用以說明前述實施例所示之搖臂1的操作例。 首先將承載架3降到最下位置爲止，在支柱2、2間使車 輛Μ開進，並使搖臂1轉動，同時用以伸縮操作滑動臂，將 車輛承載台6位置合對於車輛Μ之昇降轉轍點 在該位置合對操作中，係藉由低的擦動抵抗可使極快 且正確位置合對，使作業性頗佳。 之後使承載架3上昇並使車輛Μ昇降機上昇。 經濟部智慧財產局員工消費合作社印製 此時在滑動臂1 b，係如前述在車輛承載台6加上車輛Μ 之負載，使彈性體9、9被壓縮，而低摩擦擦動構件11、11 係被壓入於凹部7、7內，所以迄此爲止與低摩擦擦動構件 11、11進行接觸之部分，係與碰到該低摩擦擦動構件11、11 之周圍的高摩擦處理面進行接觸，且使滑動臂lb之基端下 面浮上並使低摩擦擦動構件11 a由昇降臂1 a形成進行反離之 狀態，所以在兩者之間產生大的摩擦抵抗而滑動臂1 b，係 形成難以引起位置偏移。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 7TI ~ 522106 A7 B7 五、發明説明（5 ) (請先閲讀背面之注意事項再填寫本頁} 若作業終了則使承載架3下降，使車輛承載台6若由車 輛Μ被分離則形成無負載狀態，所以以彈性體9、9之膨漲 作用使低摩擦擦動構件11、11由凹部7 . 7被壓出並自動復 位到凹部7 _ 7外的位置。 若用以採用上述實施形態之構成，則在位置合對操作 係使爲了用以擦動操作搖臂之力量被減輕，且圓滑可使車 輛承載台6位置合對於昇降轉轍點。 特別’在卡車用等能力大的搖臂係使重量大並接近於 昇降轉轍點所以需要多的勞力及時間，但若採用上述構成 則明顯使勞力被減輕，可達成效率化。 而且’昇降機上昇時係加上車輛之負載藉由高摩擦抵 抗使穩定的支持功能被發揮。 前述實施例係藉由低摩擦擦動構件達成摩擦力之減低 ，但有效用以利用市面銷售之鋼球滑閥可使具有同樣功能 〇 因此以下將用以利用鋼球滑閥之本發明的實施例，根 據顯不滑動臂1 b之基端部的圖4加以說明。 經濟部智慧財產局員工消費合作社印製 在昇降臂la之前端底面及滑動臂lb之基端上面，係分 別被形成用以貫通板面之附雌螺釘的穿孔1 2、1 2，在此等 穿孔12、12，係使鋼球滑閥13、13使其前端之鋼球13a、13a 由各穿孔12、.12形成面之水平被嵌裝成頭出之狀態。 又，在滑動臂1 b之基端下面，係與前述實施例同樣， 被安裝有做爲摩擦力減低裝置之低摩擦擦動構件1 1 a (也可 用以代用鋼球滑閥）。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 7^1 522106 Μ Β7 五、發明説明（6 ) (請先閲讀背面之注意事項再填寫本頁) 如此被構成之搖臂1，係在無負載時鋼球滑閥1 3之鋼球 13a係在頭出之狀態下，所以滑動臂lb及昇降臂la，係通過 被嵌裝於滑動臂lb之基端上面的鋼球滑閥1 3之鋼球1 3a及被 嵌裝於昇降臂之前端底面的鋼球滑閥之鋼球以及被安裝於 滑動臂之基端下面的低摩擦擦動構件1 1 a並進行接觸（圖4 之a)。 因此在位置合對時放置之昇降臂la及滑動臂lb相互間 的擦動抵抗係極低。 可是在負載時，係使被嵌裝於滑動臂1 b之基端上面的 鋼球滑閥1 3之鋼球1 3a及被嵌裝於昇降臂之前端底面的鋼球 滑閥之鋼球一起被壓入，而且使滑動臂lb之基端下面形成 浮上之狀態，所以昇降臂la及滑動臂lb相互間之擦動抵抗 .係很大，藉由車輛之重量與被壓緊力相結合形成難以引起 位置偏移。 經濟部智慧財產局員工消費合作社印製 尙有，本實施例中，也在負載時使兩者相互進行接觸 之部分，即，用以高摩擦處理鋼球之頭出部分周圍，藉由 高摩擦抵抗可用以發揮穩定的支持功能，爲了用以嵌裝鋼 球滑閥之部分係在穿孔以外也可做爲凹部。 而且，有關本發明之搖臂的構成係無任何被限定於上 述實施形態，昇降臂及滑動臂之材質·形狀.大小，昇降 臂之轉動阻止機構，及取代彈性體使用彈簧，或不使用此 等彈性體或彈簧用以利用低摩擦擦動構件自體之彈力等， 只要不脫離本發明之趣旨範圍內進行適當設計變更並無妨 ，爲了提高位置偏移防止之確實性，附加設置滑動臂擦動 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 522106 A7 B7 五、發明説明（7 ) 抑制裝置（未圖示），也可使二重之位置偏移防止功能發 揮作用。 (請先閲讀背面之注意事項再填寫本頁) 使前述位置偏移防止功能產生二重作用時，則滑動臂 之擦動抑制裝置係用以採用做爲把手可利用爲較佳，又本 發明，係將低摩擦擦動構件及鋼球滑閥做爲廉價之消耗品 可有效利用，經常可保持正常的維修狀態可說同時具有的 優點。 【發明之效果】 若依據申請專利範圍第1及2項之發明，則在車輛承載 台不加上車輛之負載在位置合對操作時，係使擦動抵抗少 ，即使卡車用等能力大的昇降臂，也可將搖臂順暢操作， 可容易將承載台接近於昇降轉轍點。 而且在車輛承載台加上車輛之負載則使滑動臂形成位 置偏移防止狀態，所以有效防止昇降機上昇時之位置偏移 〇 經濟部智慧財產局員工消費合作社印製 特別若依據申請專利範圍第3項之發明，則進行高摩擦 處理使位置偏移防止功能之信賴信跳躍式的進行提高。 又，若依據申請專利範圍第4項之發明，則使位置合對 時之順暢性更進一步提高。 進而，被利用於本發明之實施的零件係廉價，即使進 行磨耗但由於磨耗之零件交換也簡單所以經常可維持於最 佳狀態，將製造成本及運轉成本被抑制很低之效果也不倉巨 忽視。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -10- 522106 A7 B7 五、發明説明（8) 【圖式之簡單說明】 (請先閲讀背面之注意事項再填寫本頁) 圖1係顯示有關本發明之搖臂的剖面說明圖。 圖2係顯示有關本發明之搖臂在無負載時之狀態的剖面 說明圖。 圖3係顯示有關本發明之搖臂在負載時之狀態的剖面說 明圖。 圖4係變更例之說明圖。 圖5係顯示車輛維修用昇降機之槪要說明圖。 【元件編號之說明】 1 ···搖臂， U···昇降臂， lb···滑動臂， 2 ···支柱， 3…承載架， / 4…托座， 經濟部智慧財產局員工消費合作社印製 5…銷， 6…車輛承載台， 7…高台部分， 8…卡止構件， 9…凹部， 10…彈J生體， 11 111a…低摩擦擦動構件， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 522106 A7 B7 五、發明説明（9 ) 12…穿孔， 1 3…鋼球滑閥， Μ522106 A7 B7 V. Description of the invention (1) [Technical field to which the invention belongs] (Please read the precautions on the back before filling out this page) The present invention is related to a telescopic rocker that is provided in a vehicle maintenance lifter. It can be moved up and down and can be rotated horizontally at any height. At the front end, the sliding arm with the vehicle loading platform is configured to be freely pulled out / pulled into the cylindrical lifting arm. [Previous technology] The elevator for vehicle maintenance will be carried by the vehicle located at the front end of the rocker arm. The platform-to-vehicle lift switch point is extremely fast and must be correctly positioned, so when the position is matched, it is tied to the rocker arm. Requires smooth telescoping. Therefore, the telescopic rocker arm is used to deal with the friction surface with low friction, or only the roller is interposed to improve the operability. The simple rocker arm is forbidden to cause displacement in the lifting arm, so the position is suitable. On the other hand, the superiority of the sliding arm's operability becomes negative. Therefore, it is quite difficult to coexist these functions which have mutually opposite relations. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Therefore, when only a roller is installed or a low-friction treatment is performed, the position shift prevention mechanism without a sliding arm is uneasy. [Problem to be Solved by the Invention] The position shift preventing mechanism of the sliding arm is required before the elevator is raised or after the elevator is lowered-the operation is quite troublesome, and I dare not assert that the operation will not be forgotten. In addition, if the position shift prevention mechanism of the sliding arm is formed separately, this paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) '— 522106 A7 ______ B7 _ V. The description of the invention (2) will affect the device The price of the whole also forms a disturbance. (Please read the precautions on the back before filling this page) Therefore, the purpose of the present invention is to provide a rocker arm that can be operated smoothly when the positions are matched, and the position of the slide arm is automatically prevented when the lift is raised. This function ensures reliability even if the position shift prevention mechanism is omitted. [Means for solving the problem] In order to achieve the above-mentioned object, the rocker arm of the present invention is used to form a recess on the bottom surface of the front end of the lifting arm and the base end of the sliding arm, and the recess is formed on the recessed portion, so that the surface protrudes. The low-friction ^^^ member outside the recess is installed in the aforementioned recess to be press-fitted and automatically reset. At the same time, a friction reducing device is set under the base end of the sliding arm, and the bottom surface of the front end of the lifting arm and the base end of the sliding arm The above are used to form perforations to penetrate the recesses or plate surfaces, and in these recesses or perforations, the steel ball slide valve only inserts the steel balls from the level of each forming surface into a head-out state, while sliding in the aforementioned A friction reducing device is arranged below the base end of the arm. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, and these rockers are used for high friction treatment on the bottom surface of the front end of the lifting arm and on the base end of the sliding arm. Preferably, the friction reducing device is implemented by mounting the surface of the low-friction friction member more exposed than the level of the lower end surface. [Embodiment of the invention] Hereinafter, a rocker arm of a vehicle maintenance elevator according to the present invention will be described with reference to the drawings. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) Γ5Τ 'Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 522106 A7 _ B7____ Five' Description of the invention (3) Figure 1 is a sectional view showing the rocker arm 1 As shown in FIG. 5, the rocker arm 1 is lifted and moved along a pair of pillars 2 and 2, and the brackets 3 and 4 and pins 5 and 5 are mounted on the base end to be arbitrarily high. It is mounted for free horizontal rotation, and is provided with a vehicle mounting platform 6 at the front end. The rocker arm 1 is constituted by a cylindrical lifting arm 1 a and a sliding arm lb embedded in the lifting arm la to be freely rubbed to be freely retractable. The lifting arm la and the sliding arm lb are mutually A few clearances are allowed, and the upper part 7 formed on the base end portion of the slide arm 1 b and the locking member 8 installed on the upper inner surface of the front end of the lift arm 1 a are prevented from falling off. Recesses 9 and 9 are respectively formed on the inner bottom surface of the upper part 7 above the base end of the aforementioned sliding arm lb and the front end of the lifting arm 1a. These recesses 9 and 9 are embedded in each recess 9 The low-friction friction members 11 and 11 with the elastic bodies 10 and 10 inside and 9 and the surface protruding beyond the recesses 9 and 9 are installed in the aforementioned recesses 9 and 9 to be press-fitted and automatically reset. A lower surface of the lower end of the sliding arm 1b is used as a friction reducing device, and the surface of the low-friction friction member 11a having a lower level than the lower end surface is mounted so as to be constantly exposed. Furthermore, around the protrusions of the low-friction friction members 11 and 11 on the bottom surface of the front end of the lifting arm la and the base surface of the sliding arm lb, high friction processing such as knurling processing with high sliding stop effect is performed. . The rocker arm 1 thus formed is at the time when the unloaded position of the vehicle bearing platform 6 is matched, that is, when the vehicle bearing platform 6 makes the load of the vehicle inactive (hereinafter referred to as no load), as shown in FIG. 2 As shown, the lifting arm 1 a and the sliding arm lb ′ are low friction friction members 11 above and below the base end of the sliding arm lb. This paper size is applicable to the Chinese National Standard (CNS) M specification (210X297 mm) _ 6 _ m 'i HI: i II- 广 ·· II Hi--.............-I ..... i--I.-:-----i (Please read the precautions on the back before filling this page) 522106 A7 B7___ V. Description of the invention (4) (Please read the precautions on the back before filling this page) 11a and low friction friction on the inner fixed surface of the front end of the lift arm la The members Π are brought into contact with each other, and when the vehicle loading platform 6 raises the load of the vehicle while the lift is functioning (hereinafter referred to as the load), the elastic bodies 10 and 10 are compressed and the low-friction members 11 and 11 are rubbed. It is pressed into the recessed portion 9, and the sliding arm lb contacts the surface subjected to the high friction treatment to the lifting arm 1 a. With this, the sliding arm 1 a is connected with the lifting arm 1 a to make friction resistance almost non-existent under no load, so the force required for its telescopic operation is small and can be completed in a smooth pull-out / press-in operation. On the contrary, a large frictional resistance is generated between the lifting arm and the arm, so that the position shift prevention state is maintained. Here, an operation example of the swing arm 1 shown in the foregoing embodiment will be described. First, the carrier 3 is lowered to the lowest position, and the vehicle M is driven between the pillars 2 and 2 and the rocker arm 1 is rotated. At the same time, the sliding arm is telescopically operated, and the position of the vehicle carrier 6 is adjusted to the elevation of the vehicle M. In the point matching operation at this position, the low-friction resistance can make the position matching very fast and correct, and the workability is quite good. Thereafter, the carrier 3 is raised and the vehicle M lift is raised. The consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed the sliding arm 1 b at this time, as described above, the load of the vehicle M is added to the vehicle carrying platform 6, so that the elastic bodies 9 and 9 are compressed, and the low friction friction members 11, 11 is pressed into the recesses 7 and 7, so far, the portions that have come into contact with the low-friction friction members 11, 11 are the high-friction treatment surfaces that touch the surroundings of the low-friction friction members 11, 11. The contact is made, and the base end of the sliding arm lb is floated below, and the low-friction frictional member 11 a is formed by the lifting arm 1 a to be separated. Therefore, a large friction resistance is generated between the two, and the sliding arm 1 b It is difficult to cause positional displacement. This paper size applies Chinese National Standard (CNS) A4 specification (210X297mm) 7TI ~ 522106 A7 B7 V. Description of the invention (5) (Please read the precautions on the back before filling this page} If the operation is finished, make the carrier 3 Lowering, so that the vehicle loading platform 6 is separated from the vehicle M to form an unloaded state, so the low friction friction members 11, 11 are pushed out of the recesses 7.7 by the expansion of the elastic bodies 9, 9 and automatically reset. To the position outside the recess 7 _ 7. If the structure of the above embodiment is used, the pairing operation at the position is to reduce the force for wiping the rocker arm for operation, and the smoothness can make the vehicle mounting platform 6 position close Regarding the lifting point. In particular, the rocker arm with a large capacity, such as for trucks, requires a lot of labor and time because it is heavy and close to the lifting point. However, if the above structure is adopted, the labor is significantly reduced and the Achieved efficiency. Furthermore, when the elevator is raised, the load of the vehicle is added and the stable support function is exerted by high friction resistance. In the foregoing embodiment, the frictional force was reduced by the low-friction friction member. The same effect can be obtained by using a commercially available steel ball slide valve. Therefore, an embodiment of the present invention using a steel ball slide valve will be described below with reference to FIG. 4 showing the base end portion of the slide arm 1 b. The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed on the bottom surface of the front end of the lifting arm la and the base end of the sliding arm lb, which are respectively formed with perforations 1 and 12 for female screws penetrating the surface of the board. The perforations 12 and 12 are made by inserting the steel ball slide valves 13 and 13 so that the steel balls 13a and 13a at the front end of the perforations 12 and .12 are horizontally inserted into the head. The slide arm 1 b Below the base end, as in the previous embodiment, a low-friction frictional member 1 1 a is installed as a friction reducing device (a steel ball slide valve can also be used instead). This paper size applies the Chinese national standard (CNS ) A4 size (210X297 mm) 7 ^ 1 522106 Μ B7 V. Description of the invention (6) (Please read the precautions on the back before filling this page) The swing arm 1 thus constructed is a steel ball sliding under no load The steel ball 13a of the valve 1 3 is in a state of head out, so the sliding arm lb And the lifter arm la is the steel ball 1 3a through the steel ball slide valve 13 embedded on the base end of the sliding arm lb and the steel ball and the steel ball slide valve embedded on the bottom surface of the front end of the lifter arm. The low-friction friction member 1 1 a installed under the base end of the sliding arm is brought into contact (a in FIG. 4). Therefore, the friction resistance system between the lifting arm la and the sliding arm lb placed when the positions are aligned with each other Low. However, under load, the steel ball 1 3a is embedded in the steel ball slide valve 1 3 above the base end of the sliding arm 1 b and the steel ball slide valve is embedded in the bottom surface of the front end of the lifting arm. The ball is pressed together, and the bottom of the sliding arm lb forms a floating state, so the lifting arm la and the sliding arm lb are resistant to friction between each other. It is very large, because the weight of the vehicle and the pressing force are in phase. It is difficult to cause a position shift due to the combination formation. It is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. In this embodiment, the part that makes the two contact with each other also under load, that is, the high-friction treatment is used around the head part of the steel ball. Resistance can be used to provide a stable support function. In order to embed the part of the steel ball slide valve outside the perforation, it can also be used as a recess. In addition, the structure of the rocker arm of the present invention is not limited to the above-mentioned embodiment, the materials, shapes, sizes of the lift arm and the slide arm, the rotation preventing mechanism of the lift arm, and the use of a spring instead of an elastic body, or does not use this. Elastomers or springs are used to utilize the low-friction frictional force of the member itself, as long as appropriate design changes are made without departing from the scope of the present invention. In order to improve the reliability of positional displacement prevention, a sliding arm wiper is additionally provided. The paper size of this paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 522106 A7 B7 V. Description of the invention (7) The suppression device (not shown) can also make the dual position shift prevention function work. (Please read the precautions on the back before filling in this page) When the aforementioned position shift prevention function has a dual effect, the friction suppression device of the sliding arm is preferably used as a handle, and the present invention It is an advantage that low friction friction components and steel ball slide valves can be effectively used as inexpensive consumables, which can often maintain a normal maintenance state. [Effects of the invention] According to the inventions in the first and second scopes of the patent application, when the vehicle loading platform is operated in the same position without adding the load of the vehicle, the friction resistance is reduced, even if the truck has a large capacity. The lifting arm can also smoothly operate the swing arm, which can easily bring the bearing platform close to the lifting switch point. In addition, adding the vehicle load to the vehicle loading platform causes the sliding arm to form a position shift prevention state, so it can effectively prevent the position shift when the elevator is raised. 0 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. According to the invention, the reliability of the position shift prevention function is improved by performing a high friction treatment. In addition, according to the invention according to item 4 of the scope of patent application, the smoothness at the time of position matching can be further improved. Furthermore, the parts used in the implementation of the present invention are inexpensive, and even when worn, the worn parts can be exchanged easily, so they can always be maintained in an optimal state, and the effect of suppressing manufacturing costs and running costs is very low. Ignore. This paper size applies to Chinese National Standard (CNS) A4 specification (210X297 mm) -10- 522106 A7 B7 V. Description of the invention (8) [Simplified description of the drawing] (Please read the precautions on the back before filling this page) FIG. 1 is an explanatory sectional view showing a rocker arm according to the present invention. Fig. 2 is an explanatory sectional view showing a state of the rocker arm of the present invention under no load. Fig. 3 is a sectional explanatory view showing a state of a rocker arm under load according to the present invention. FIG. 4 is an explanatory diagram of a modification example. FIG. 5 is a schematic diagram showing a main part of a vehicle maintenance lift. [Explanation of component number] 1 ... rocker arm, U ... lift arm, lb ... slide arm, 2 ... pillar, 3 ... carrier, 4 ... bracket, employee of Intellectual Property Bureau, Ministry of Economic Affairs The consumer cooperative prints 5 ... pins, 6 ... vehicle loading platforms, 7 ... high platform parts, 8 ... locking members, 9 ... recesses, 10 ... bombs, 11 111a ... low-friction friction members, this paper is applicable to China National Standard (CNS) A4 specification (210X297 mm) 522106 A7 B7 V. Description of the invention (9) 12 ... perforated, 1 3 ... steel ball slide valve, Μ
球。 I 兩 岡 車 i Μ : W (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ29?公釐） -12-ball. I Two gang cars i Μ: W (Please read the notes on the back before filling this page) Printed on the paper by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economy This paper applies the Chinese National Standard (CNS) Α4 specification (210 × 29? Mm)- 12-