201014775 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種升降機構，尤其涉及一種用於電子裝 置上之升降機構。 【先前技術】 隨著電腦之廣泛應用，其功能日益增加及完善，其體 積亦趨向於輕薄化發展》由於液晶顯示屏相對CRT(Cath'〇de201014775 IX. Description of the Invention: [Technical Field] The present invention relates to a lifting mechanism, and more particularly to a lifting mechanism for an electronic device. [Prior Art] With the wide application of computers, their functions are increasing and perfecting, and their volume tends to be thinner and lighter." Because LCD screens are relatively CRT (Cath'〇de
Ray Tube，陰極射線管）顯示屏具有體積小、重量輕之優 點，故其逐漸取代CRT顯示屏成為電腦之主要部件。 為了方便人們從不同視角觀看液晶顯示屏，液晶顯示 屏上通吊k有升降機構以對液晶顯示屏之高度及傾角進行 調整。常見之升降機構多採用鉸鏈結構來調節液晶顯示屏 之高度及傾角。為了使對高度或者傾角於一合適範圍内變 化，於鉸鏈結構中一般會採用帶限位片之限位墊圈與鉸鏈 本體上之限位槽配合之方式來限位，藉由凸塊於限位槽内 之滑動來控制液晶顯示屏傾角。此種限位方式靠二元件之 配合實現，且需要於鉸鏈本體上開槽，增加了鉸鏈本體之 加工工序，使結構變得複雜，另，因為液晶顯示屏之重量 等關係，限位片與限位槽之間之摩擦較大，限位墊圈之限 位片經長期使用後容易產生磨損或變形，使用壽命較短。、 【發明内容】 鑒於上述狀況，有必要提供一種限位單元結構簡單且 耐用之升降機構。 一種升降機構，包括第一樞接組件及第二樞接組件， 6 201014775 以及連接第一樞接組件及第二柩接組件之第一支架、第一 連桿及第二連桿，第一支架藉由樞轴與第一樞接組件相 ‘連，該升降機構還包括套設於樞軸上之限位件，該限位件 位於第一連桿及第二連桿之間，以限制第一連桿及第二連 桿相對第一枢接組件之旋轉角度。 上述升降機構藉由於第一連桿及第二連桿之間增加一 套設於樞軸上之限位件來實現對第一連桿及第二連桿旋轉 角度之限制，無需再增加額外之結構與限位件配合，限位 ®單元之結構較為簡單。第一連桿與第二連桿僅於到達極限 位置時與限位件接觸，三者之間之摩損較小，且限位件套 設於樞軸上，具有較佳之結構強度，故較為耐用。 【實施方式】 下面結合附圖及實施方式對本發明提供之升降機構作 進一步詳細說明。 請參閱圖1，升降機構10包括第一樞接組件20、第二 &框接組件30、連接於第一樞接組件20及第二樞接組件30 之間之第一彈性件40、第一連桿50、第二連桿60、第一支 架70及第二支架80以及旋轉組件90。 請同時參閱圖2及圖3，第一柩接組件20包括一第一 樞接座21、二摩擦件23及二限位件25。 第一樞接座21包括本體211、凸出於本體211之收容 部213及凸出於收容部213之第一鉤部215。該本體211為 矩形板。該收容部213大致為半月形，自本體211之中部 凸起。第一鉤部215自收容部213遠離本體211之一端橫 7 201014775 向凸出。收容部213上開設有收容摩擦件23之第一收容孔 2131、第二收容孔2133以及供旋轉組件90穿設之裝配孔 * 2135，第一收容孔2131、第二收容孔2133及裝配孔2135 均橫向貫穿收容部213，且裝配孔2135位於第一收容孔 2131及第二收容孔2133之間。第一收容孔2131及第二收 容孔2133形狀與摩擦件23之形狀一致，裝配孔2135為圓 形通孔。 摩擦件23包括摩擦部231及固定部233。摩擦部231 ❹為空心圓柱，其侧壁上轴向開設有開口 2311，固定部233 為一矩形板，自開口 2311 —邊緣遠離摩擦部231徑向延 伸。二摩擦件23分別收容於第一樞接座21之第一收容孔 2131及第二收容孔2133内，固定部233可限制摩擦件23 於第一收容孔2131及第二收容孔2133内之轉動。 限位件25為套筒，當旋轉組件90與第一枢接座21連 接時，限位件25位於第一樞接座21之二侧。 第二樞接組件30包括外殼31、第二樞接座32、第二 ❿ 彈性件33、扭轉組件34、限位墊片35以及平墊片36。 外殼31包括一矩形底板311、自底板311相對之二邊 緣垂直延伸之第一侧板313及第二側板315、固定於底板 .311上之支撐板317。第一側板313上開設有第一通孔3131 及安裝孔3133,第二側板315上開設有第二通孔3151及限 位槽3153，第二通孔3151與第一通孔3131相對，限位槽 3153自第二側板315之邊緣向内凹陷形成。支撐板315與 底板311相貼合，並藉由螺栓（圖未示）固定於底板311 201014775 上，該支撐板317可固定並支撐顯示屏（圖未示）。 請同時參閱圖4,第二樞接座32形狀與第一柩接座21 ‘大致相同，包括半月形之容納部321及自容納部321 —端 橫向凸出之第二鉤部323。容納部321上開設有軸孔3211、 第一容納孔3213、第二容納孔3215及容置孔3217，轴孔 3211、第一容納孔3213、第二容納孔3215及容置孔3217 均為橫向貫穿該容納部321之通孔。軸孔3211位於第一容 納孔3213及第二容納孔3215之間，容置孔3217位於軸孔 ❹3211 —侧。第二樞接座32可放置於外殼31之第一側板313 及第二侧板315之間。 第二彈性件33為二彈片，該二彈片上開設有通孔。可 以理解，彈片之數量不局限於兩個，第二彈性件33亦可為 彈簧。 扭轉組件34包括圓形套筒341及套設於套筒341外部 之扭簣343。套筒341抵持於第二樞接座32之收容部321 _上。扭簧343可藉由將一端插入外殼31之第一侧板313之 安裝孔3133中，另一端插入第二枢接座32之容納部321 之容置孔3217中固定。 限位墊片35包括從邊緣延伸之限位部351及從中部貫 通開設之限位孔353，該限位部351為方形凸塊，限位孔 353為非圓形孔。限位墊片35之限位部351卡持於外殼31 之第二側板315之限位槽3153内並可於限位槽3153内滑 動。 平墊片36大致為圓環狀，與限位墊片35緊貼，可防 201014775 止限位墊片35被磨損。 第一彈性件40為柱狀螺旋拉伸彈簧，一端連接於第一 樞接座21之第一鉤部215上，一端連接於第二樞接座32 之第二鉤部323上。 第一連桿50大致為矩形板狀結構，一端固定於第一樞 接組件20之第一樞接座21、一端固定於第二樞接組件30 之第二樞接座32。第一連桿50之二端分別開設有圓形通孔 51 ° 第二連桿60大致為矩形板狀結構，一端固定於第一樞 接組件20之第一框接座21、一端固定於第二樞接組件30 之第二樞接座32。第二連桿60之二端分別開設有圓形通孔 61 ° 第一支架70大致為矩形板狀結構，一端固定於第一柩 接組件20之第一樞接座21、一端固定於第二樞接組件30 之外殼31。第一支架70之二端分別開設有圓形通孔71。 第二支架80大致為矩形板狀結構，一端固定於第一柩 接組件20之第一樞接座21、一端固定於第二樞接組件30 之外殼31。第二支架80之二端分別開設有圓形通孔81。 請同時參閱圖1及圖2,旋轉組件90包括二第一旋轉 件91以及四第二旋轉件93。 第一旋轉件91包括樞軸911及與樞轴911配合之緊固 件913。樞軸911之末端設置有螺接緊固件913之螺紋部 9111，本實施例中緊固件913為螺帽。 第二旋轉件93包括轉軸931及與轉轴931配合之卡持 201014775 件933。轉軸931之末端設置有收容卡持件933之卡槽9311 (如圖5所示），本實施例中卡持件933為卡環。 • 第一樞接組件20及第二樞接組件30藉由第一彈性件 40、第一連桿50、第二連桿60、第一支架70、第二支架 80以及旋轉組件90相連接。 連接第一樞接組件20、第二樞接組件30及第一彈性件 40時，首先將第一彈性件40 —端掛於第一樞接座21之第 一鉤部215上，接著將另一端掛於第二樞接座32之第二鉤 ❿部323上。 連接第一樞接組件20與第一連桿50、第二連桿60、 第一支架70、第二支架80時，首先將一轉軸931依次穿過 第一連桿50 —端之圓形通孔51以及收容於第一樞接座21 之第一收容孔2131中之摩擦件23,藉由卡持件933卡持於 轉軸931之卡槽9311内使第一連桿50與第一枢接座21固 定連接。接著將另一轉軸931依次穿過第二連桿60 —端之 ❿圓形通孔61以及收容於第一樞接座21之第二收容孔2133 中之摩擦件23，藉由另一卡持件933卡持於該轉軸931之 卡槽9311内使第二連桿60與第一樞接座21固定連接。然 後將第一旋轉件91之樞軸911依次穿過第一支架70 —端 之圓形通孔71、一限位件25、第一樞接座21之裝配孔2135 以及第二支架80 —端之圓形通孔81，最後藉由螺紋部9111 與緊固件913配合將第一支架70及第二支架80固定於第 一樞接座21上。 連接第二樞接組件30與第一連桿50、第二連桿60、 11 201014775 第一支架70、第二支架80時，首先將一轉軸931依次穿過 * 第一連桿50另一端之圓形通孔51以及第二樞接座32之第 •一容納孔3213，藉由一卡持件933持於該轉軸931之卡槽 9311内使第一連桿50與第二樞接座32固定連接。接著將 另一轉軸931依次穿過第二連桿60另一端之圓形通孔61 以及第二樞接座32之第二容納孔3215，藉由卡持件933 卡持於該轉轴931之卡槽9311内使第二連桿60與第二樞 接座32固定連接。然後將第一旋轉件91之樞軸911依次 ❹穿過外殼31之第一通孔3131、第一支架70另一端之圓形 通孔71、第二樞接座32之軸孔3211、扭轉組件34之套筒 341、限位墊片35、平墊片36、外殼31之第二通孔3151、 第二彈性件33以及第二支架80另一端之圓形通孔81，最 後藉由螺紋部9111與緊固件913配合將第一支架70及第 二支架80固定於外殼31上。 第一樞接組件20、第二樞接組件30、第一連桿50及 ❹第二連桿60組成一四連桿機構。第一連桿50及第二連桿 60可相對第一枢接組件20轉動，第二樞接組件30之外殼 31可相對第一連桿50、第二連桿60以及第二樞接座32轉 動。於第一連桿50及第二連桿60轉動時，摩擦件23與轉 軸931之間會產生使第一連桿50及第二連桿60停留之摩 擦力，第一彈性件40因被拉伸而產生之彈力可平衡顯示屏 之重力。於第二枢接組件30轉動時，扭轉元件34之扭簧 343因被扭轉而產生之扭力亦可平衡顯示屏之重力。另，當 樞軸911與緊固件913之鎖合時，第二彈性件33被壓縮， 12 201014775 於轉動中，被壓縮之第二彈性件33可提供彈力壓緊限位墊 片35以提供轉動阻力。 * 第一連桿50及第二連桿60可各自繞轉軸931轉動， 當第一連桿50或者第二連桿60接觸限位件25後，限位件 25會抵持住第一連桿50或者第二連桿60使其無法繼續旋 轉，第一連桿50及第二連桿60旋轉達到極限位置。此種 升降機構之限位件25直接套設於樞軸911上，無需額外增 加元件與之配合，結構較為簡單，且對於強度之要求不高， ❹另，限位件25與第一連桿50及第二連桿60之間僅於旋轉 達到極限位置時才會出現摩擦，故磨損較小，較為耐用。 同時，該升降機構10於第一樞接座21二側均設置限 位件25，可限制第一支架70及第二支架80與第一樞接座 21之間之距離，以預留出足夠之空間來容納第一彈性件40。 另，該升降機構10增加了第二支架80來輔助提供支 撐力，保證該升降機構10之強度及穩定性。 _ 綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明實施例之升降機構之立體示意圖。 圖2係圖1所示升降機構之立體分解圖。 圖3係圖1所示升降機構之部分立體分解圖。 13 201014775 圖4係圖 1所不之苐二框接座之立體不意圖 〇 圖5係圖 1所示之第二旋轉件之立體示意圖 0 【主要元件符 號說明】 升降機構 10 第一樞接組件 20 第一樞接座 21 本體 211 收容部 213 第一收容孔 2131 第二收容孔 2133 裝配孔 2135 第一鉤部 215 摩擦件 23 ®摩擦部 231 開口 2311 固定部 233 限位件 25 第二極接組件 30 外殼 31 底板 311 第一侧板 313 第一通孔 3131 安裝孔 3133 第二側板 315 第二通孔 3151 限位槽 3153 支撐板 317 第二極接座 ❹ 32 容納部 321 軸孔 3211 第一容納孔 3213 第二容納孔 3215 容置孔 3217 第二鉤部 323 第二彈性件 33 扭轉組件 34 套筒 341 扭簧 343 限位墊片 35 限位部 351 限位孔 353 平墊片 36 第一彈性件 40 第一連桿 50 圓形通孔 51 14 201014775 第二連桿 60 圓形通孔 61 第一支架 70 圓形通孔 71 第二支架 80 圓形通孔 81 旋轉組件 90 第一旋轉件 91 樞軸 911 螺紋部 9111 緊固件 913 第二旋轉件 93 轉軸 931 卡槽 9311 卡持件 933 ❹ 15The Ray Tube (cathode ray tube) display has the advantages of small size and light weight, so it gradually replaces the CRT display and becomes the main component of the computer. In order to facilitate people to view the liquid crystal display from different angles of view, the liquid crystal display screen has a lifting mechanism to adjust the height and inclination of the liquid crystal display. The common lifting mechanism mostly uses a hinge structure to adjust the height and inclination of the liquid crystal display. In order to change the height or the inclination angle within a suitable range, the limit structure washer with the limiting piece is generally used in the hinge structure to cooperate with the limiting groove on the hinge body to limit the position, and the convex block is used for the limit position. Sliding in the slot to control the tilt of the LCD screen. The limiting method is realized by the cooperation of the two components, and needs to be slotted on the hinge body, which increases the processing procedure of the hinge body, complicates the structure, and because of the weight of the liquid crystal display, the limiting piece and the The friction between the limit grooves is large, and the limit piece of the limit washer is prone to wear or deformation after long-term use, and the service life is short. SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a lifting mechanism having a simple and durable limiting unit structure. A lifting mechanism includes a first pivoting component and a second pivoting component, 6 201014775, and a first bracket, a first link and a second link connecting the first pivoting component and the second docking component, the first bracket The lifting mechanism further includes a limiting member sleeved on the pivot, the limiting member is located between the first connecting rod and the second connecting rod to limit the first portion A rotation angle of a link and a second link relative to the first pivotal assembly. The lifting mechanism realizes the limitation of the rotation angles of the first link and the second link by adding a set of pivoting limit members between the first link and the second link, and no additional need is added. The structure is matched with the limiter, and the structure of the limit® unit is relatively simple. The first link and the second link are in contact with the limiting member only when reaching the limit position, and the friction between the three links is small, and the limiting member is sleeved on the pivot shaft, and has better structural strength, so it is more durable . [Embodiment] The lifting mechanism provided by the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Referring to FIG. 1 , the lifting mechanism 10 includes a first pivoting assembly 20 , a second & frame assembly 30 , and a first elastic member 40 connected between the first pivoting component 20 and the second pivoting component 30 . A link 50, a second link 60, a first bracket 70 and a second bracket 80, and a rotating assembly 90. Referring to FIG. 2 and FIG. 3 simultaneously, the first splicing assembly 20 includes a first pivoting seat 21, two friction members 23, and two limiting members 25. The first pivoting seat 21 includes a body 211, a receiving portion 213 protruding from the body 211, and a first hook portion 215 protruding from the receiving portion 213. The body 211 is a rectangular plate. The accommodating portion 213 has a substantially half-moon shape and is convex from the middle of the body 211. The first hook portion 215 protrudes from the accommodating portion 213 away from one end of the body 211 at a height of 7 201014775. The receiving portion 213 is provided with a first receiving hole 2131 for receiving the friction member 23, a second receiving hole 2133, and a mounting hole * 2135 for the rotating assembly 90. The first receiving hole 2131, the second receiving hole 2133 and the mounting hole 2135 are provided. The mounting hole 2135 is located between the first receiving hole 2131 and the second receiving hole 2133. The shape of the first receiving hole 2131 and the second receiving hole 2133 is the same as the shape of the friction member 23, and the fitting hole 2135 is a circular through hole. The friction member 23 includes a friction portion 231 and a fixing portion 233. The friction portion 231 is a hollow cylinder having an opening 2311 axially formed on the side wall thereof, and the fixing portion 233 is a rectangular plate extending radially from the opening 2311 away from the friction portion 231. The two friction members 23 are respectively received in the first receiving hole 2131 and the second receiving hole 2133 of the first pivoting seat 21, and the fixing portion 233 can restrict the rotation of the friction member 23 in the first receiving hole 2131 and the second receiving hole 2133. . The limiting member 25 is a sleeve. When the rotating assembly 90 is connected to the first pivoting seat 21, the limiting member 25 is located on two sides of the first pivoting seat 21. The second pivoting assembly 30 includes a housing 31, a second pivoting seat 32, a second yoke elastic member 33, a torsion assembly 34, a limit spacer 35, and a flat washer 36. The outer casing 31 includes a rectangular bottom plate 311, a first side plate 313 and a second side plate 315 extending perpendicularly from opposite sides of the bottom plate 311, and a support plate 317 fixed to the bottom plate .311. A first through hole 3131 and a mounting hole 3133 are defined in the first side plate 313, and a second through hole 3151 and a limiting slot 3153 are defined in the second side plate 315. The second through hole 3151 is opposite to the first through hole 3131, and the limit is The groove 3153 is recessed inwardly from the edge of the second side plate 315. The support plate 315 is attached to the bottom plate 311 and fixed to the bottom plate 311 201014775 by bolts (not shown). The support plate 317 can fix and support the display screen (not shown). Referring to FIG. 4 at the same time, the second pivoting seat 32 has a shape substantially the same as that of the first splicing seat 21, and includes a half-moon shaped receiving portion 321 and a second hook portion 323 which is laterally protruded from the end of the receiving portion 321 . The receiving portion 321 is provided with a shaft hole 3211, a first receiving hole 3213, a second receiving hole 3215 and a receiving hole 3217. The shaft hole 3211, the first receiving hole 3213, the second receiving hole 3215 and the receiving hole 3217 are both lateral. A through hole penetrating the receiving portion 321 . The shaft hole 3211 is located between the first receiving hole 3213 and the second receiving hole 3215, and the receiving hole 3217 is located at the side of the shaft hole 3211. The second pivoting seat 32 can be placed between the first side plate 313 and the second side plate 315 of the outer casing 31. The second elastic member 33 is a two elastic piece, and the two elastic pieces are provided with a through hole. It can be understood that the number of the elastic pieces is not limited to two, and the second elastic member 33 may also be a spring. The torsion assembly 34 includes a circular sleeve 341 and a twist 343 that is sleeved outside the sleeve 341. The sleeve 341 is abutted on the receiving portion 321 _ of the second pivoting seat 32. The torsion spring 343 can be fixed by inserting one end into the mounting hole 3133 of the first side plate 313 of the outer casing 31 and the other end into the receiving hole 3217 of the receiving portion 321 of the second pivoting seat 32. The limiting spacer 35 includes a limiting portion 351 extending from the edge and a limiting hole 353 extending through the central portion. The limiting portion 351 is a square protrusion, and the limiting hole 353 is a non-circular hole. The limiting portion 351 of the limiting spacer 35 is locked in the limiting slot 3153 of the second side plate 315 of the outer casing 31 and slidable in the limiting slot 3153. The flat washer 36 is substantially annular and is in close contact with the limiting spacer 35 to prevent the limit washer 35 from being worn by the 201014775. The first elastic member 40 is a cylindrical spiral tension spring. One end is connected to the first hook portion 215 of the first pivoting seat 21, and one end is connected to the second hook portion 323 of the second pivoting seat 32. The first connecting rod 50 has a substantially rectangular plate-like structure, and one end is fixed to the first pivoting seat 21 of the first pivoting assembly 20, and one end is fixed to the second pivoting seat 32 of the second pivoting assembly 30. The two ends of the first connecting rod 50 are respectively provided with a circular through hole 51. The second connecting rod 60 has a substantially rectangular plate-like structure, and one end is fixed to the first framed seat 21 of the first pivotal assembly 20, and one end is fixed at the first end. The second pivoting seat 32 of the pivotal assembly 30. The second end of the second connecting rod 60 is respectively provided with a circular through hole 61. The first bracket 70 has a substantially rectangular plate-like structure, and one end is fixed to the first pivoting seat 21 of the first splicing assembly 20, and one end is fixed to the second. The outer casing 31 of the pivot assembly 30. The two ends of the first bracket 70 are respectively provided with circular through holes 71. The second bracket 80 has a substantially rectangular plate-like structure, and one end is fixed to the first pivoting seat 21 of the first splicing assembly 20, and one end is fixed to the outer casing 31 of the second pivoting assembly 30. The two ends of the second bracket 80 are respectively provided with circular through holes 81. Referring to Figures 1 and 2, the rotating assembly 90 includes two first rotating members 91 and four second rotating members 93. The first rotating member 91 includes a pivot 911 and a fastening member 913 that cooperates with the pivot 911. The end of the pivot 911 is provided with a threaded portion 9111 of a screw fastener 913. In this embodiment, the fastener 913 is a nut. The second rotating member 93 includes a rotating shaft 931 and a clamping 201014775 piece 933 that cooperates with the rotating shaft 931. The end of the rotating shaft 931 is provided with a card slot 9311 (shown in FIG. 5) for accommodating the holding member 933. In this embodiment, the holding member 933 is a snap ring. • The first pivoting assembly 20 and the second pivoting assembly 30 are coupled by a first resilient member 40, a first link 50, a second link 60, a first bracket 70, a second bracket 80, and a rotating assembly 90. When the first pivoting component 20, the second pivoting component 30, and the first elastic component 40 are connected, the first elastic component 40 is firstly hung on the first hook 215 of the first pivoting seat 21, and then the other One end is hung on the second hook portion 323 of the second pivoting seat 32. When the first pivotal assembly 20 is connected to the first link 50, the second link 60, the first bracket 70, and the second bracket 80, a rotating shaft 931 is firstly passed through the circular end of the first connecting rod 50. The hole 51 and the friction member 23 received in the first receiving hole 2131 of the first pivoting seat 21 are locked in the slot 9311 of the rotating shaft 931 by the holding member 933 to pivot the first link 50 with the first link The seat 21 is fixedly connected. Then, the other rotating shaft 931 is sequentially passed through the circular through hole 61 of the second connecting rod 60 and the friction member 23 received in the second receiving hole 2133 of the first pivoting seat 21 by another clamping. The member 933 is held in the card slot 9311 of the rotating shaft 931 to fix the second link 60 to the first pivoting seat 21. Then, the pivot 911 of the first rotating member 91 is sequentially passed through the circular through hole 71 at the end of the first bracket 70, a limiting member 25, the mounting hole 2135 of the first pivoting seat 21, and the second bracket 80 end. The circular through hole 81 finally supports the first bracket 70 and the second bracket 80 on the first pivot base 21 by the screw portion 9111 being engaged with the fastener 913. When the second pivoting assembly 30 and the first link 50, the second link 60, the 1114014775, the first bracket 70 and the second bracket 80 are connected, a rotating shaft 931 is firstly passed through the other end of the first link 50. The first through hole 51 and the second receiving hole 3213 of the second pivoting seat 32 are held in the slot 9311 of the rotating shaft 931 by a holding member 933 to make the first connecting rod 50 and the second pivoting seat 32. Fixed connection. Then, the other rotating shaft 931 is sequentially passed through the circular through hole 61 at the other end of the second connecting rod 60 and the second receiving hole 3215 of the second pivoting seat 32, and the holding member 933 is held by the rotating shaft 931. The second link 60 is fixedly connected to the second pivot seat 32 in the card slot 9311. Then, the pivot 911 of the first rotating member 91 is sequentially smashed through the first through hole 3131 of the outer casing 31, the circular through hole 71 at the other end of the first bracket 70, the shaft hole 3211 of the second pivoting seat 32, and the torsion assembly. a sleeve 341 of 34, a limiting washer 35, a flat washer 36, a second through hole 3151 of the outer casing 31, a second elastic member 33, and a circular through hole 81 at the other end of the second bracket 80, and finally a threaded portion The 9111 cooperates with the fastener 913 to fix the first bracket 70 and the second bracket 80 to the outer casing 31. The first pivoting assembly 20, the second pivoting assembly 30, the first link 50 and the second link 60 form a four-bar linkage. The first link 50 and the second link 60 are rotatable relative to the first pivot assembly 20, and the outer casing 31 of the second pivot assembly 30 is opposite to the first link 50, the second link 60, and the second pivot seat 32. Turn. When the first link 50 and the second link 60 rotate, a frictional force between the friction member 23 and the rotating shaft 931 causes the first link 50 and the second link 60 to stay, and the first elastic member 40 is pulled. The stretch generated by the tension balances the gravity of the display. When the second pivoting assembly 30 is rotated, the torsion spring 343 of the torsion member 34 can also balance the weight of the display by the torsion generated by the twisting. In addition, when the pivot 911 is engaged with the fastener 913, the second elastic member 33 is compressed, and 12 201014775 is rotated, and the compressed second elastic member 33 can provide the elastic pressing limit spacer 35 to provide rotation. resistance. The first link 50 and the second link 60 can each rotate about the rotating shaft 931. When the first link 50 or the second link 60 contacts the limiting member 25, the limiting member 25 can resist the first connecting rod. 50 or the second link 60 makes it impossible to continue to rotate, and the first link 50 and the second link 60 are rotated to the limit position. The limiting member 25 of the lifting mechanism is directly sleeved on the pivot 911, and does not need to add additional components to cooperate with it, the structure is relatively simple, and the requirement for strength is not high, and the limiting member 25 and the first connecting rod are not required. The friction between the 50 and the second link 60 occurs only when the rotation reaches the limit position, so the wear is small and durable. At the same time, the lifting mechanism 10 is provided with a limiting member 25 on both sides of the first pivoting seat 21 to limit the distance between the first bracket 70 and the second bracket 80 and the first pivoting seat 21, so as to reserve enough The space accommodates the first elastic member 40. In addition, the lifting mechanism 10 adds a second bracket 80 to assist in providing the supporting force to ensure the strength and stability of the lifting mechanism 10. _ In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the present invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lifting mechanism according to an embodiment of the present invention. Figure 2 is an exploded perspective view of the lifting mechanism shown in Figure 1. Figure 3 is a partially exploded perspective view of the lifting mechanism of Figure 1. 13 201014775 FIG. 4 is a perspective view of the second rotating frame of FIG. 1 and FIG. 5 is a perspective view of the second rotating member shown in FIG. 1 [Description of main components] Lifting mechanism 10 First pivoting assembly 20 first pivoting seat 21 body 211 receiving portion 213 first receiving hole 2131 second receiving hole 2133 mounting hole 2135 first hook portion 215 friction member 23 friction portion 231 opening 2311 fixing portion 233 limiting member 25 second pole Assembly 30 Housing 31 Base plate 311 First side plate 313 First through hole 3131 Mounting hole 3133 Second side plate 315 Second through hole 3151 Limiting groove 3153 Support plate 317 Second pole socket ❹ 32 Housing portion 321 Shaft hole 3211 First Receiving hole 3213 Second receiving hole 3215 accommodating hole 3217 Second hook portion 323 Second elastic member 33 Torsion assembly 34 Sleeve 341 Torsion spring 343 Limiting spacer 35 Limiting portion 351 Limiting hole 353 Flat washer 36 First Elastic member 40 first link 50 circular through hole 51 14 201014775 second link 60 circular through hole 61 first bracket 70 circular through hole 71 second bracket 80 circular through hole 81 rotating assembly 90 first rotating member 9 1 Pivot 911 threaded part 9111 Fastener 913 Second rotating part 93 Rotary shaft 931 Card slot 9311 Holding part 933 ❹ 15