.201020199 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，尤其涉及一種用於液晶顯 示器之可調節視角及高度之升降機構。 【先前技術】 目前 ❹ ❹ 液a曰颁不器因體積小、重量輕，清晰度高且輻 射低等優點而被市場所廣泛接受。液晶顯示器之設計亦越 來越多，化、人性化，例如習知之一種液晶顯示器可調節 ，角及高，’以適應用戶之不同需求。該液晶顯示器可調 即視角及高度之功能藉由—升降機構實現，該升降機構包 括顯示器月板、固定顯示器背板之迴轉架、升降架、安裝 絲趣固^安震座之底^。該升降樞轉組件樞接於迴 μ與安裝座之間，且該升降架上至少設有—組四連 f、，，四連桿機構包括銷釘連接之上力臂片、下力臂片、 j桿、後連桿，上力臂片套設於樞接迴轉架與升降架之 β軸上，下力臂片固定於安裝座上。進一步地， 分別設有圓弧缺口，該安裝座之二= 件= 升降機構藉由迴轉架繞樞轉組 ^與四連桿機構之拖轉運動實現對液晶顯示器之高度： Ρ且於調節高度時不會改變液晶顯示器之視角 — ^之配^由安裝座二側邊之凸片與升降架二侧邊之圓弧缺 之配合可限定液晶顯示器之調節高度。 、 准，該升降機構於最高位置與最低位置之限位均藉由 7 201020199 安裝座之凸片分別與升降架之圓弧缺口之二端抵持實現， ‘導致安裝座之凸片於長期使用之過程中較易磨損，且抗疲 勞性能較差，致使凸片之結構強度變低，抗衝擊性能變差， 於外力作用下易折斷，而使影響升降機構之限位效果與穩 定性。 【發明内容】 鑒於上述狀況，有必要提供一種限位效果好、穩定性 強之升降機構及其四連桿結構。 ❹ 一種升降機構，包括樞轉連接之第一連接架、第二連 接架、樞接片、連接片以及穿設該樞接片之轉軸，該第一 連接架之一端为別.設置有限位凸起，該轉軸上設置有限位 部，該連接片上設置有限位拴，當該升降機構處於第一極 限位置時，該第一連接架一端之限位凸起與該限位拾相抵 持，當該升降機構處於第二極限位置時，該第一連接架另 一端之限位凸起與該限位部相抵持。 ❹ 一種四連桿結構，包括樞轉連接之第一連接架、第二 連接架、樞接片及連接片，該第一連接架之二端分別設置 有限位凸起，該拖接片上設置有限位部，該連接片上設置 有限位拴，當該四連桿結構處於第一極限位置時，該第一 連接架-端之限位凸起與該限位拾相抵持，當該四連桿結 構處於第二極限位置時，該第—連接架另—端之限位凸起 與該限位部相抵持。 *上述升降機構可實現對液晶顯示器之視角及高度之調 節，且於調節高度之過程中，由於該升降機構於第一第 8 201020199 二極限位置之限位藉由第一連接架二端之限位凸起分別與 限位栓及限位部協同配合之方式實現。長期使用之過程 中，各零部件之磨損較小，抗疲勞性能較好，從而具有良 好之抗衝擊性能’於外力作用下不易損壞，使得升降機構 於長期使用過程中具有良好之限位效果與穩定性。 【實施方式】 下面將結合附圖及較佳實施例對本發明之升降機構及 其四連桿結構作進一步之詳細說明。 請參見圖1，本發明較佳實施例之升降機構包括背板 10、固定背板10之轉動架20、第一連接架30、第二連接 架3(Τ、安裝座40及樞轉元件50，第一、第二連接架30、 3(Τ藉由柩轉組件50樞接於轉動架20與安裝座40之間。 請參見圖2,轉動架20包括固定板201以及從固定板 201下部垂直延伸而形成之二支架202。固定板201之上部 與背板10固接。支架202上開設有軸孔221，並於轴孔221 週圍設置有一固定槽222。支架202靠近固定板201之一端 形成有一向内彎折之凸片223’支架202遠離固定板201 之一端形成有一弧形缺口 224。 第一連接架30大體為Η型，其中部為一連接板3〇1， 且連接板301之下側設置有至少一向内彎折之卡鈎3011。 第一連接架30之二侧均設置有垂直於連接板301之侧板 302，且侧板302之二端均向外凸伸一段距離形成端部 321、322，端部321、322上分別開設有圓孔3211、3221。 端部321、322上還分別設置有限位凸起3212、3222。第二 201020199 連接架3(Τ亦大體為Η型，其結構與第一連接架30大體相 同。第二連接架3(Τ之中部為一連接板30Γ，且連接板30Γ • 之上侧設置有至少一與卡鈎3011相對之卡鈎3012,第二連 ' 接架3CT之二侧同樣設置有侧板302…並於侧板302'之二端 形成端部32Γ、322'。端部32Γ、322'上分別形成有限位缺 口 3212,、3222,。 安裝座40包括一大體為“工”字型之支撐架401以及由 支撐架401頂端之二側垂直延伸形成二連接片402,連接片 〇 402之二端均開設有一樞轉孔（圖未示）。連接片402之中 部固設有一限位拴4021。 樞轉組件50包括轉轴501、樞接片502、耐磨片503、 墊圈504、限位片505、摩擦片506、固定墊片507、轉動 墊片508、墊片組509、彈片組510、套環511、扭簧512、 抵持片513、墊片514及鎖固件515。 轉軸501包括一限位部5011及一變形軸部5012。限位 部5011為形成於轉軸501上之一凸緣。變形轴部5012上 ❹ 設有相對沿其軸線方向延伸之二切面（圖未標），且變形轴 部5012上遠離限位部5011之一端設有螺紋。 樞接片502中間開設有一異形轴孔5021，異形軸孔 5021二侧對稱開設有二通孔5022。樞接片502中部之邊緣 還開設有一凹口 5023。 耐磨片503為一圓片，其中部開設有異形軸孔5031， 邊緣形成有一固定凸片5032。墊圈504大體為圓筒狀。限 位片505亦為一圓片，其中部開設有異形軸孔5051，邊緣 201020199 形成有一限位凸片5052。摩擦片506上形成有一定位凸片 5061 ° * 固定墊片507為一片狀鈑金件，其中部開設有一圓形 . 轴孔5071，邊緣處折彎形成有一定位片5072。圓形軸孔 5071之週圍還開設有相對之二定位凹槽5073。 轉動墊片508為一片狀鈑金件，其大體為圓形。轉動 墊片508之中部開設有一異形軸孔5081，轉動墊片508之 一端面上形成有二定位凸起（圖未示），該定位凸起用於與 〇 固定墊片507上之定位凹槽5073相配合。 墊片組509為若干墊片疊合而成。彈片組510為若干 碟形彈片疊合而成。扭簧512包括簧圈部5121及由該簧圈 部5121二端延伸出之插腳5122。抵持片513為一圓片，其 中部開設有一異形轴孔5131，邊緣處開設有一缺口 5132， 該缺口 5132用於與扭簧512之一插腳5122相配合。 該升降機構還包括八連接組件60以及至少一拉簧 70。連接組件60包括一螺釘61、若干摩擦片62及一螺母 63。拉簧70之二端分別形成有掛鈎71。 裝配該升降機構時，將轉軸501依次穿設樞接片502 之異形軸孔5021、耐磨片503之異形軸孔5031、墊圈504、 限位片505之異形軸孔5051、摩擦片506、轉動架20之支 架202上之軸孔221、固定墊片507之圓形軸孔5071、轉 動墊片508之異形轴孔5081、墊片組509、彈片組510、套 環511、扭簧512、抵持片513之異形軸孔5131及墊片514, 並與鎖固件515鎖合。 11 201020199 然後將第一、第二連接架30、3(Τ之相應端部321、32r 分別藉由一連接元件60樞接於樞接片502之二端，具體 地，將螺釘61依次穿設一摩擦片62、端部321之圓孔3211、 * 另一摩擦片62、樞接片502 —端之通孔5022,並與螺母63 鎖合。再將端部32Γ以同樣方式連接於樞接片502之另一 端。如此，第一、第二連接架30、3(V即與轉動架20樞轉 連接。同時，耐磨片503之固定凸片5032卡設於樞接片502 之凹口 5023内；限位片505之限位凸片5052位於轉動架 ❹ 20之弧形缺口 224中；摩擦片506之定位凸片5061及固定 墊片507之定位片5072均卡設於轉動架20之固定槽222 中；扭簧512之一插腳5122卡設於抵持片513之缺口 5132 内，另一插腳5122卡設於轉動架20之凸片223之底部； 拉簧70之二掛鈎71分別掛設於第一、第二連接架30、3(Τ 之卡鈎3011、3012上。 最後將第一、第二連接架30、3(Τ之相應端部322、322' _ 分別藉由一連接組件60樞接於連接片402之二端即可。 ❹ 將升降機構應用於液晶顯示器時，將背板10與液晶顯 示器之顯示幕殼體相連。工作時，扳動液晶顯示器之顯示 幕殼體，帶動轉動架20繞樞轉組件50之轉軸501之軸線 相對於第一、第二連接架30、3(Τ旋轉，從而可改變液晶顯 示器之視角。此時，摩擦片506與固定墊片507隨轉動架 20 —同繞轉軸501旋轉；樞接片502、耐磨片503、限位片 505、轉動墊片508及抵持片513相對於轉軸501固定；彈 片組510被壓縮而產生軸向力。藉由各元件之間之摩擦配 12 201020199 合，可使液晶顯示器定位於特定視角。同時，藉由轉動架 20之弧形缺口 224與限位片505之限位凸片5052之配合可 限定液晶顯示器之視角之調節範圍。扭簧512之扭力因轉 ^ 動架20轉動方向之不同而增大或減小，以防止調節液晶顯 示器視角時用力過度，有利於保護樞轉組件50。 請參見圖3,當升降機構位於第一極限位置時，第一連 接架30之端部322之限位凸起3222與安裝座40上之限位 拴4021相抵，同時第二連接架3(Τ之端部32Γ之限位缺口 ❹ 3212'與轉轴501之限位部5011相抵，從而限定液晶顯示器 之調節高度之最低點。當需要將液晶顯示器之高度調高 時，向上扳動液晶顯示器之顯示幕殼體，藉由第一、第二 連接架30、3(Τ之樞轉運動實現對液晶顯示器高度之調節， 且於調節高度時不會改變液晶顯示器之視角。此時，限位 凸片3222與限位栓4021相分離，限位缺口 32W與限位部 5011相分離，從而不會對液晶顯示器高度之調節造成阻 ©礙。同時，藉由連接組件60之各元件之摩擦配合，可將液 晶顯示器定位於特定高度。 請參見圖4,當升降機構位於第二極限位置時，第一連 接架30之端部321之限位凸片3212與轉軸501之限位部 5011相抵，同時第二連接架3(Τ之端部322'之限位缺口 3222' 與安裝座40上之限位拴4021相抵，從而限定液晶顯示器 之調節高度之最高點。調節高度之過程中，拉簧307之收 縮力因第一、第二連接架30、3(V運動方向之不同而增大或 減小，以防止調節液晶顯示器高度時用力過度，有利於保 13 201020199 護升降機構。 由於上述升降機構於最高位置與最低位置之限位藉由 第一連接架30二端之限位凸起3212、3222與第二連接架 ^ 3(Τ二端之限位缺口 3212、3222'分別與限位部5011及限位 栓4021協同配合之方式實現。於長期使用之過程中，各零 部件之磨損較小，抗疲勞性能較好，從而具有良好之抗衝 擊性能，於外力作用下不易損壞，使得升降機構於長期使 用過程之中具有良好之限位效果與穩定性。 ❹ 另，上述升降機構中，藉由連接組件60樞轉連接之第 一、第二連接架30、3(Τ與樞接片502、連接片402 —同構 成一四連桿結構，該四連桿結構可被單獨應用於除液晶顯 示器之升降機構以外之其他機構中，起支撐及限位之作 用。此時，轉轴501上之限位部5011需固設於樞接片502 上。 另，限位凸起3212、3222可設於第二連接架3(Τ上， _ 而限位缺口 3212^ 3222'可設於第一連接架30上。且限位 缺口 3212、3222'可被省略，而只於第一連接架30或第二 連接架3(Τ之二端分別設置二限位凸起3212及二限位凸起 3222 ° 综上所述，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。 14 201020199 【圖式簡單說明】 圖1係本發明較佳實施例之升降機構之組裝圖。 圖2係圖1所示升降機構之立體分解圖。 圖3係圖1所示升降機構位於第一極限位置之組裝圖。 圖4係圖1所示升降機構位於第二極限位置之組裝圖。 【主要元件符號說明】BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting mechanism, and more particularly to an elevating mechanism for an adjustable viewing angle and height of a liquid crystal display. [Prior Art] At present, the ❹ 液 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰 曰The design of liquid crystal displays is also becoming more and more user-friendly. For example, a liquid crystal display of the prior art can be adjusted, angled and high, to meet the different needs of users. The liquid crystal display can be adjusted, that is, the function of viewing angle and height is realized by a lifting mechanism, which comprises a display moon plate, a slewing frame for fixing the back plate of the display, a lifting frame, and a bottom for mounting the wire. The lifting pivoting assembly is pivotally connected between the back μ and the mounting seat, and the lifting frame is provided with at least a group of four connected f, and the four-bar linkage mechanism comprises a pin connecting the upper arm piece and the lower force arm piece, The j-bar and the rear connecting rod are sleeved on the β-axis of the pivoting gyrator and the lifting frame, and the lower force arm piece is fixed on the mounting seat. Further, a circular arc notch is respectively provided, and the two parts of the mounting seat = the lifting mechanism realizes the height of the liquid crystal display by the towing motion of the rotating frame around the pivoting group and the four-bar linkage mechanism: When the angle of the liquid crystal display is not changed, the matching height of the liquid crystal display can be limited by the combination of the tabs on the two sides of the mounting seat and the arcs on the two sides of the lifting frame. The limit of the highest position and the lowest position of the lifting mechanism is achieved by the protrusions of the 7 201020199 mounts and the two ends of the arc gap of the lifting frame respectively, which results in the long-term use of the tabs of the mounting seat. In the process, it is easy to wear and has poor fatigue resistance, resulting in low structural strength of the tab, poor impact resistance, easy to break under external force, and affecting the limit effect and stability of the lifting mechanism. SUMMARY OF THE INVENTION In view of the above situation, it is necessary to provide a lifting mechanism with good limiting effect and high stability and a four-bar linkage structure thereof.升降 a lifting mechanism, comprising a first connecting frame pivotally connected, a second connecting frame, a pivoting piece, a connecting piece and a rotating shaft passing through the pivoting piece, the first connecting frame is provided with a finite position convex a limiting portion is disposed on the rotating shaft, and a limiting position is set on the connecting piece. When the lifting mechanism is in the first extreme position, the limiting protrusion at one end of the first connecting frame abuts the limit picking. When the lifting mechanism is in the second extreme position, the limiting protrusion of the other end of the first connecting frame abuts the limiting portion.四 A four-bar linkage structure includes a first connecting frame, a second connecting frame, a pivoting piece and a connecting piece which are pivotally connected, and the two ends of the first connecting frame are respectively provided with a limited position protrusion, and the drag piece is limitedly arranged a finite position 设置 is disposed on the connecting piece, and when the four-bar linkage structure is at the first extreme position, the limiting protrusion of the first connecting frame end is abutted against the limiting picking, when the four-link structure When in the second extreme position, the limiting protrusion of the other end of the first connecting frame abuts the limiting portion. * The above-mentioned lifting mechanism can realize the adjustment of the viewing angle and height of the liquid crystal display, and in the process of adjusting the height, the limit of the lifting mechanism in the first 8th 201020199 limit position is limited by the two ends of the first connecting frame The position protrusions are respectively realized in cooperation with the limit bolt and the limit portion. In the long-term use process, the wear of each component is small, the fatigue resistance is good, and thus the good impact resistance is not easy to be damaged under the action of external force, so that the lifting mechanism has a good limit effect in the long-term use process. stability. [Embodiment] Hereinafter, the elevating mechanism and the four-link structure of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. Referring to FIG. 1 , a lifting mechanism according to a preferred embodiment of the present invention includes a backing plate 10 , a turret 20 for fixing the backing plate 10 , a first connecting frame 30 , and a second connecting frame 3 (the cymbal, the mounting base 40 and the pivoting member 50 ) The first and second connecting brackets 30 and 3 are pivotally connected between the rotating frame 20 and the mounting seat 40 by the twisting assembly 50. Referring to FIG. 2, the rotating frame 20 includes a fixing plate 201 and a lower portion of the fixing plate 201. Two brackets 202 are formed to extend vertically. The upper portion of the fixing plate 201 is fixed to the back plate 10. The bracket 202 is provided with a shaft hole 221, and a fixing groove 222 is disposed around the shaft hole 221. The bracket 202 is adjacent to one end of the fixing plate 201. Forming an inwardly bent tab 223', the bracket 202 is formed at one end of the fixing plate 201 to form an arcuate notch 224. The first connecting frame 30 is substantially of a Η type, the middle portion is a connecting plate 3〇1, and the connecting plate 301 The lower side is provided with at least one inwardly bent hook 3011. The two sides of the first connecting frame 30 are respectively provided with a side plate 302 perpendicular to the connecting plate 301, and both ends of the side plate 302 protrude outwardly by a distance. The end portions 321 and 322 are formed, and the end portions 321 and 322 are respectively provided with circular holes 3211 and 3221. 321 and 322 are respectively provided with limited protrusions 3212 and 3222. The second 201020199 is connected to the frame 3 (the cymbal is also generally Η-shaped, and its structure is substantially the same as that of the first connecting frame 30. The second connecting frame 3 (the middle part is a connecting plate 30Γ, and the connecting plate 30Γ • the upper side is provided with at least one hook 3012 opposite to the hook 3011, and the second side of the second connecting frame 3CT is also provided with a side plate 302... and the side plate 302' The two ends form end portions 32Γ, 322'. The end portions 32Γ, 322' respectively form limit notches 3212, 3222. The mounting base 40 includes a support frame 401 having a substantially "work" shape and the support frame 401. The two sides of the top end are vertically extended to form two connecting pieces 402. The two ends of the connecting piece 402 are respectively provided with a pivot hole (not shown). A limiting portion 4021 is fixed in the middle of the connecting piece 402. The pivoting assembly 50 includes a turn The shaft 501, the pivoting piece 502, the wear piece 503, the washer 504, the limiting piece 505, the friction plate 506, the fixing pad 507, the rotating pad 508, the spacer group 509, the elastic piece set 510, the collar 511, the torsion spring 512, the resisting piece 513, the spacer 514 and the locking member 515. The rotating shaft 501 includes a limiting portion 5011 and a deforming shaft portion 5012. The limiting portion 5011 is a flange formed on the rotating shaft 501. The deforming shaft portion 5012 is provided with two cutting surfaces (not labeled) extending in the axial direction thereof, and the deforming shaft portion 5012 is away from the limiting portion 5011. One end is provided with a thread. A pivotal hole 5021 is defined in the middle of the pivoting piece 502, and a two-way hole 5022 is symmetrically opened on both sides of the shaped shaft hole 5021. A notch 5023 is defined in the middle of the central portion of the pivoting piece 502. The wear-resistant piece 503 is a circular piece, and a part of the shaft hole 5031 is formed in the middle portion, and a fixing piece 5032 is formed on the edge. The washer 504 is generally cylindrical. The limiting piece 505 is also a circular piece, and the part is provided with a special-shaped shaft hole 5051, and the edge 201020199 is formed with a limiting piece 5052. A locating tab 5061 ° is formed on the friction plate 506. The fixing pad 507 is a piece of sheet metal member, and a circular portion is formed in the middle portion. The shaft hole 5071 is bent at the edge to form a positioning piece 5072. A plurality of positioning grooves 5073 are also formed around the circular shaft hole 5071. The rotating shim 508 is a sheet of sheet metal that is generally circular. A deformed shaft hole 5081 is defined in the middle of the rotating washer 508, and two positioning protrusions (not shown) are formed on one end surface of the rotating washer 508, and the positioning protrusion is used for positioning the recess 5073 on the fixing pad 507. Match. The shim group 509 is formed by laminating a plurality of shim. The shrapnel group 510 is formed by laminating a plurality of disc-shaped shrapnels. The torsion spring 512 includes a coil portion 5121 and a pin 5122 extending from both ends of the coil portion 5121. The resisting piece 513 is a circular piece, and a shaped shaft hole 5131 is defined in a middle portion thereof, and a notch 5132 is defined in the edge. The notch 5132 is for engaging with one of the pins 5122 of the torsion spring 512. The lifting mechanism also includes an eight connection assembly 60 and at least one tension spring 70. The coupling assembly 60 includes a screw 61, a plurality of friction plates 62, and a nut 63. The two ends of the tension spring 70 are respectively formed with hooks 71. When the lifting mechanism is assembled, the rotating shaft 501 is sequentially threaded with the shaped shaft hole 5021 of the pivoting piece 502, the shaped shaft hole 5031 of the wear piece 503, the washer 504, the shaped shaft hole 5051 of the limiting piece 505, the friction plate 506, and the rotation. The shaft hole 221 of the bracket 202 of the frame 20, the circular shaft hole 5071 of the fixing washer 507, the special-shaped shaft hole 5081 of the rotating washer 508, the spacer group 509, the elastic piece group 510, the collar 511, the torsion spring 512, and the yoke The shaped shaft hole 5131 and the spacer 514 of the piece 513 are held and locked with the locking member 515. 11 201020199 Then, the first and second connecting brackets 30 and 3 are respectively pivoted to the two ends of the pivoting piece 502 by a connecting component 60, specifically, the screws 61 are sequentially disposed. a friction plate 62, a circular hole 3211 of the end portion 321, a further friction plate 62, a through hole 5022 of the pivot piece 502, and a lock with the nut 63. The end portion 32 is connected to the pivot in the same manner. The other end of the piece 502. Thus, the first and second connecting frames 30, 3 (V are pivotally connected with the turret 20. At the same time, the fixing tabs 5032 of the wear plate 503 are engaged with the notches of the pivoting piece 502. In the 5023, the limiting tab 5052 of the limiting piece 505 is located in the curved notch 224 of the rotating frame 20; the positioning piece 5061 of the friction piece 506 and the positioning piece 5072 of the fixing pad 507 are all locked on the turret 20; In the fixing slot 222, one of the torsion springs 512 is latched in the notch 5132 of the resisting piece 513, and the other pin 5122 is locked on the bottom of the tab 223 of the turret 20; It is disposed on the first and second connecting frames 30, 3 (the hooks 3011 and 3012 of the cymbal. Finally, the first and second connecting frames 30, 3 (the corresponding end portions 322 of the cymbal) 322' _ is respectively pivotally connected to the two ends of the connecting piece 402 by a connecting component 60. 时 When the lifting mechanism is applied to the liquid crystal display, the backing plate 10 is connected to the display screen housing of the liquid crystal display. The display screen housing of the liquid crystal display drives the turret 20 around the axis of the rotating shaft 501 of the pivoting assembly 50 relative to the first and second connecting frames 30, 3 (Τ, thereby changing the viewing angle of the liquid crystal display. The friction plate 506 and the fixing washer 507 rotate with the turret 20 and rotate around the rotating shaft 501; the pivoting piece 502, the wear piece 503, the limiting piece 505, the rotating pad 508 and the resisting piece 513 are fixed with respect to the rotating shaft 501; The group 510 is compressed to generate an axial force. The liquid crystal display can be positioned at a specific viewing angle by the friction between the components. At the same time, the arcuate notch 224 of the turret 20 and the limiting piece 505 are The cooperation of the limiting tabs 5052 can define the adjustment range of the viewing angle of the liquid crystal display. The torsion force of the torsion spring 512 is increased or decreased by the rotation direction of the rotating frame 20, so as to prevent excessive force when adjusting the viewing angle of the liquid crystal display, which is advantageous. Yu Bao The pivoting assembly 50. Referring to FIG. 3, when the lifting mechanism is in the first extreme position, the limiting protrusion 3222 of the end portion 322 of the first connecting frame 30 is opposite to the limit 拴 4021 on the mounting seat 40, and at the same time The two connecting brackets 3 (the limiting notches 3212 of the end portions 32 of the crucibles are offset from the limiting portions 5011 of the rotating shaft 501, thereby defining the lowest point of the adjustment height of the liquid crystal display. When it is necessary to increase the height of the liquid crystal display, The display screen housing of the liquid crystal display is pulled upward, and the height of the liquid crystal display is adjusted by the pivotal movement of the first and second connecting frames 30 and 3, and the viewing angle of the liquid crystal display is not changed when the height is adjusted. At this time, the limiting tab 3222 is separated from the limiting pin 4021, and the limiting notch 32W is separated from the limiting portion 5011, so that the adjustment of the height of the liquid crystal display is not hindered. At the same time, the liquid crystal display can be positioned at a particular height by the friction fit of the components of the connector assembly 60. Referring to FIG. 4, when the lifting mechanism is in the second extreme position, the limiting tab 3212 of the end portion 321 of the first connecting frame 30 abuts the limiting portion 5011 of the rotating shaft 501, and the second connecting frame 3 The limit notch 3222' of the portion 322' is opposite to the limit 拴 4021 on the mounting seat 40, thereby defining the highest point of the adjustment height of the liquid crystal display. During the adjustment of the height, the contraction force of the tension spring 307 is due to the first and second The connecting brackets 30, 3 (the direction of V movement increases or decreases to prevent excessive force when adjusting the height of the liquid crystal display, which is beneficial to protect the lifting mechanism of the 2010 201020. Due to the position of the lifting mechanism at the highest position and the lowest position The limiting protrusions 3212, 3222 and the second connecting frame 3 at the two ends of the first connecting frame 30 cooperate with the limiting portion 5011 and the limiting pin 4021 respectively. The method is realized. In the process of long-term use, the wear of each component is small, the fatigue resistance is good, and the impact resistance is good, and it is not easy to be damaged under the action of external force, so that the lifting mechanism has good in the long-term use process. It Position and stability. ❹ In addition, in the above-mentioned lifting mechanism, the first and second connecting brackets 30 and 3 pivotally connected by the connecting component 60 (the cymbal and the pivoting piece 502 and the connecting piece 402 form a four-way connection) The rod structure, the four-bar linkage structure can be separately applied to other mechanisms than the lifting mechanism of the liquid crystal display, and functions as a support and a limit. At this time, the limiting portion 5011 on the rotating shaft 501 needs to be fixed at the pivot. The limiting protrusions 3212, 3222 can be disposed on the second connecting frame 3 (the upper limit frame 3212^3222' can be disposed on the first connecting frame 30. The limiting notch 3212 3222' can be omitted, but only the first connecting frame 30 or the second connecting frame 3 (the two limiting ends 3212 and the two limiting protrusions 3222 are respectively arranged at the two ends of the cymbal, respectively. Having met the requirements of the invention patent, the patent application is filed 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. Those skilled in the art will be assisted by the present invention. Equivalent modifications or changes made by the spirit should be covered in the following BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled view of a lifting mechanism according to a preferred embodiment of the present invention. FIG. 2 is an exploded perspective view of the lifting mechanism shown in FIG. 1. FIG. The assembly diagram of the mechanism is located at the first extreme position. Figure 4 is an assembly diagram of the lifting mechanism shown in Figure 1 at the second extreme position.
轉動架 20 固定板 201 支架 202 轴孔 221 固定槽 222 凸片 223 弧形缺口 224 第一連接架 30 第二連接架 30， 連接板 301、301， 侧板 302、302f 卡釣 3011 > 3012 端部 321、322、321， 、322f 圓孔 3211、3221 限位凸起 3212、3222 限位缺口 3212,、3222r 安裝座 40 支撐架 401 連接片 402 限位拴 4021 樞轉組件 50 轉軸 501 限位部 5011 變形軸部 5012 枢接片 502 異形軸孔 5021 通孔 5022 凹口 5023 耐磨片 503 異形轴孔 5031 固定凸片 5032 墊圈 504 限位片 505 異形軸孔 5051 限位凸片 5052 15 201020199 摩擦片 506 固定墊片 507 定位片 5072 轉動墊片 508 墊片組 509 套環 511 簧圈部 5121 抵持片 513 缺口 5132 鎖固件 515 螺釘 61 螺母 63 掛鈎 71 定位凸片 5061 軸孔 5071 定位凹槽 5073 異形軸孔 5081 彈片組 510 扭簧 512 插腳 5122 異形軸孔 5131 墊片 514 連接組件 60 摩擦片 62 拉簧 70 16Rotating frame 20 fixing plate 201 bracket 202 shaft hole 221 fixing groove 222 tab 223 arc notch 224 first connecting frame 30 second connecting frame 30, connecting plates 301, 301, side plates 302, 302f card fishing 3011 > 3012 end Parts 321, 322, 321, , 322f Round holes 3211, 3221 Limiting projections 3212, 3222 Limit notch 3212, 3222r Mounting seat 40 Support frame 401 Connecting piece 402 Limiting position 4021 Pivoting assembly 50 Rotary shaft 501 Limiting part 5011 Deformation Shaft 5012 Pivot Plate 502 Shaped Shaft Hole 5021 Through Hole 5022 Notch 5023 Wear Plate 503 Shaped Shaft Hole 5031 Fixing Tab 5032 Washer 504 Limiting Plate 505 Shaped Shaft Hole 5051 Limiting Tab 5052 15 201020199 Friction Plate 506 Fixing washer 507 Positioning plate 5072 Rotating washer 508 Shim set 509 Collar 511 Reed part 5121 Resistive piece 513 Notch 5132 Locking 515 Screw 61 Nut 63 Hook 71 Positioning tab 5061 Shaft hole 5071 Positioning groove 5073 Shaped Shaft hole 5081 Shrapnel group 510 Torsion spring 512 Pin 5122 Shaped shaft hole 5131 Shim 514 Connection assembly 60 Friction plate 62 Tension spring 70 16