M270801 八、新型說明： 【新型所屬之技術領域】 本新型是有關於-種輪椅，特別是指一種具有椅背仰 角調整之輪椅。 【先前技術】 敘之身理機能障礙者，大多是利用輪椅作為移行的 工具。而以往輪椅的椅背也大多沒有調整之功能，且身理 機能障礙者除了因本身身理機能的限制，無法隨意活動外 ’更常因坐置固定姿勢過久而造成舒適感不佳。 為了解決這種問題，如圖i、圖2所示（申請案號第 78210365號案），現有一種具有可調整椅背角度之輪椅，具 有椅采1、一由该椅架1其中一側向上延伸的椅背2及一 連結在該椅架1與該椅背2之間的調整單it 3。該椅架1具 有一朝一後方向延伸的連接桿1〇1，該調整單元3具有一樞 妾在β亥椅走2上的一螺桿3〇!、一套設在該螺桿3〇i外部的 套管302、一套設在該套管3〇2 一側孔3〇2，内部且可與該螺 杯301產生嚅合的齒塊3〇3、一提供該齒塊3们保持嚅合在 Λ累桿301上的彈簧304及一可連接在該齒塊3〇3與一掣 動把手305之間的鋼索3〇6。該套管3〇2是樞設在該連接桿 101 上。 當操作該掣動把手305時，會利用鋼索306掣動該齒 塊303遠離該螺桿3〇1 (彈簧3〇4呈被壓縮狀態），且使該 累桿301可在套管302中產生滑動，而達到椅背2角度調 整之目的，當釋放該掣動把手305時，利用彈簧304的彈 M270801 力又可驅動該齒塊303屬合在該螺桿MU， 背2的角度獲得固定。 1@椅 雖然這種設計可依使用者的需求而調整㈣2的 角度’但是®為制者麻椅f 2的肖歧衫利用 塊3〇3與螺桿3〇1的唱合所產生，且當椅背2調整後二 :者無法輕易判斷齒塊303與螺# 3〇1的齒是否有穩固： 合’以致於若㈣303未完全與螺桿3()1的齒產生屬人， 使用者即躺在椅背2上，就报容易造成整個椅背迅速 掉落之危險情事。X，該齒塊如必須在該側孔地， 暢滑動’也就是說，該齒塊3〇3與側& 3〇2,之間必須 間隙’但此間隙卻很容易造成鋼f 3〇6在擎動齒塊％ 產生偏斜，甚至容易造成卡制而無法正常運作。 、 再者，這種椅背2若欲收折而叠合在該椅架j上方 ’該螺桿3〇1會自套管302中脫出，且導致齒塊303的定 位性不佳。 【新型内容】 因此，本新型之目的，即在提供一種構件簡單、椅背 ^度調整後可獲得穩固定位，且椅f角度之調整操作相當 容易的具有椅背仰角調整之輪椅。 田 於疋，本新型包含具有椅背仰角調整之輪椅，包含有 一輪架單元、一設置在該輪架單元上方的座椅單元及_樞 接在該座椅單元上的線性傳動器。該輪架單元具有一沿水 平方向设置的框架及數軸設在該框架底部的輪體。該座椅 單元具有一底支撐架及一樞接在該底支撐架上的椅背架， M270801 該底支撐架具有二平行設置且設於一側部上的樞板及一由 該等樞板朝一後方向延伸而出的定位桿，該等樞板各具有 一樞接部，該椅背架具有一活動樞接在該等樞板之樞接部 上的底端部、一由該底端部向上延伸而成的頂端部、一位 在該底、頂端部之間且朝該後方向延伸的延伸桿。該線性 傳動器的-長方向對應於該椅背架，並具有一轴設在該定 位桿上的第一端部及一與該第一端部呈相反設置且軸設在 忒延伸桿上的第二端部，該第二端部可相對於該第一端部 產生伸縮，且使該椅背架以該樞接部為樞轉中心而相對於 該座椅單元產生角度調整。 【實施方式】 、有關本新型之前述及其他技術内容、特點與功效，在 以下配合參考圖式之四個較佳實施例的詳細說明中，將可 清楚的呈現。 在本新型被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 /圖3圖4所不，本新型具有椅背仰角調整之輪椅第 ―車乂佳實靶例’包含有一輪架單$ 1〇、一設置在該輪架單 兀上方的座椅單凡2〇及一樞接在該座椅單元⑼上的線 性傳動器30。 >該輪架單元10具有一沿水平方向設置的框架U及數軸 设在該框架11底部的輪體12。 5亥座椅早兀2〇具有一底支撐架21及-由該底支撐架 21向上延伸的椅背架22。 M270801 該底支揮架21具有二呈平行設置且由—側部向上延伸 的柩板211、—對應該等樞板211 了頁部且朝-後方向延伸而 出的定位桿212、-樞接在該定位桿212上的扣板213及一 提供該扣板213彈性的彈簧214。該等樞板2ιι各1有__ 於頂部且位在蚊位桿212 —側的樞接部215。該定位^ 犯具有-朝後方向設置且呈單向開放的嵌槽216，該扣板 213具有-樞接在該嵌槽216内側的樞轉部217、—位在該 樞轉部217 -側且對應於該嵌槽216的卡勾218、一位在= 樞轉部217另-侧且與該卡勾218相反設置的扳動部加厂 該椅背架22具有-活動樞接在該等樞板2ιι之框接部 215上的底端部221、—由該底端部221向上延伸而成的頂 端部222、-鄰近該頂端部222且朝該後方向延伸的延伸桿 223，該延伸# 223恰與較位桿212對應設置在定位桿 212上方。 本實施例的線性傳動器3〇是以電動缸為例，其一長方 向對應於該椅背架22，並具有一軸設在該定位桿212上旦 為缸體的第一端部31及一與該第一端部31呈相反設置且 軸設在該延伸桿223上的第二端部32。第_端部31具有一 可嵌套在㈣槽216中且可受該卡自218扣錢㈣轴銷 31卜該第二端部32可相對於該第一端部3l i生伸縮。 再如圖3、圖4所示，#該線性傳動器％組配完成時 ’第二端部32是樞設在該延伸桿⑵末端部上，而該第一 端部31的軸銷311是嵌設在該㈣216中，且利用該彈菁 214提供該扣板213的卡勾218可喪扣在該轴銷3ιι上，促 M270801 使該第一端部31得以軸如—& + θ 柘疋位在該定位桿212上。且圖3 疋顯示該線性傳動器3〇 ^ ^ L 刃弟一柒邛32相對於該第一端部 31產生縮入的狀態，此時 ^ μ椅者架22概呈直立設置。且當 刼作者欲調整椅背架22的 旧1 Ρ角時，如圖5所示，即可啟動 :亥線性傳動器30,且使該第二端部32相對於該第一端部 1產生縮入動作，則該椅背架以的頂端部222就可以該植 接部215為樞轉中心而相對於 各 相對於忒底支撐架21產生角度調整 動作，且達到椅背仰角的調整目的。 ▲且利賴線性傳動H 3G的操作，該射架22的仰角 ㈣不僅相當容易’且椅背架22調整後的定位性佳、使用 上較為安全，在操作上更是相當容易。 再如圖6實線所示，當輪椅暫時不使用且欲將該椅背 架22收折疊合在該底支„ 21上方時，操作者可向上按 壓該扣板2η的扳動部219’促使該卡勾218可自軸銷3ΐι 上脫離，則該軸鎖311就可自該嵌槽216中滑出，且使該線 性傳動器30的第-端部31與該定位桿212產生脫離，則 操作者就可扳動該椅背架22朝底支撐架21產生靠合（如 圖6假想線所示），而達到收合目的。當欲再使用時，只須 再將該椅背架22向上扳起，且再按壓該扣板213且使軸銷 311得以再扣入嵌槽216中，且釋放對扣板213的施力時， 扣板213之卡勾218又可回復對軸銷311的擋扣作用。 再如圖7、圖8所示，本新型第二實施例與第—實施例 大致相同，其差別在於第二實施例的線性傳動器3〇,具有一 對應該第一端部31，的第一桿件33,、一對應該第二端部32, M270801 且與該第—捍件33，互 第一、H ” 條们弟一杯件34,、一套設在 一#件33，、34,套接處的束環％ 35’的快拆組36,。 义“束裱 使得^ 4 田#作该快拆組36,呈鬆釋狀態時，即M270801 8. Description of the new model: [Technical field to which the new model belongs] The new model relates to a type of wheelchair, particularly a wheelchair with a seat back elevation angle adjustment. [Previous Technology] Most people with physical disabilities use wheelchairs as a tool for moving. In the past, most wheelchairs did not have the function of adjusting the back of the wheelchair, and people with physical impairments were not able to move freely due to their physical and physical limitations, and more often they felt uncomfortable because they were sitting and fixed for too long. In order to solve this problem, as shown in Fig. I and Fig. 2 (Application No. 78210365), there is a wheelchair with an adjustable back angle of the chair, which has a chair 1, and one side of the chair frame 1 faces upward. The extended seat back 2 and an adjustment sheet it 3 connected between the chair frame 1 and the seat back 2. The chair frame 1 has a connecting rod 101 extending in a rear direction, the adjusting unit 3 has a screw 30 pivoted on the β-hai chair walk 2, and a set of external Sleeve 302, a set of holes 302 provided on one side of the sleeve 302, internally and can be combined with the screw cup 301 to form a tooth block 303, as soon as the tooth block 3 is provided to keep the The spring 304 on the Λ tired rod 301 and a steel cable 300 that can be connected between the tooth block 303 and a detent handle 305. The sleeve 30 is pivotally mounted on the connecting rod 101. When the actuating handle 305 is operated, the steel block 306 is used to actuate the tooth block 303 away from the screw 301 (the spring 300 is compressed), and the tired rod 301 can slide in the sleeve 302 To achieve the purpose of adjusting the angle of the back 2 of the chair, when the latching handle 305 is released, the force of the spring M304 of the spring 304 can drive the tooth block 303 to engage the screw MU, and the angle of the back 2 is fixed. 1 @ chair Although this design can adjust the angle of ㈣2 according to the needs of the user ', but ® is produced by the Xiao Qi shirt of the manufacturer's hemp chair f 2 using the chorus of block 303 and screw 301, and when After adjusting the back of the chair 2, the second: the person cannot easily judge whether the teeth of the tooth block 303 and the screw # 3〇1 are stable: so that if the 完全 303 is not completely generated with the teeth of the screw 3 () 1, the user is lying On the seat back 2, there is a danger that the whole seat back may fall quickly. X, if the tooth block must slide in the side hole, that is to say, that is to say, there must be a gap between the tooth block 303 and the side & 30, but this gap can easily cause steel f3. 6 Skew occurs in the engine gear block%, which may even cause jamming and prevent normal operation. Furthermore, if the chair back 2 is to be folded and superimposed on the chair frame j ′, the screw 301 will come out of the sleeve 302 and result in poor positioning of the tooth block 303. [New content] Therefore, the purpose of this new model is to provide a wheelchair with a seat back elevation angle adjustment that is simple in structure, can obtain a stable fixed position after adjustment of the seat back angle, and is relatively easy to adjust the f angle of the chair. Tian Yuxi, the new model includes a wheelchair with a seat back elevation angle adjustment, including a wheel frame unit, a seat unit disposed above the wheel frame unit, and a linear actuator pivotally connected to the seat unit. The wheel frame unit has a frame provided along a horizontal direction and a wheel body provided with a number of axes at the bottom of the frame. The seat unit has a bottom support frame and a seat back frame pivotally connected to the bottom support frame. M270801 The bottom support frame has two pivot plates arranged in parallel and arranged on one side and a pivot plate formed by the pivot plates. Positioning rods extending in a rear direction, each of the pivot plates has a pivot joint, the seat back frame has a bottom end movably pivotally connected to the pivot joints of the pivot plates, and a bottom end A top portion extending upwardly from the portion, an extension rod extending between the bottom and the top portion and extending in the rear direction. The -long direction of the linear actuator corresponds to the seat back frame, and has a first end portion on which the shaft is provided on the positioning rod and a shaft provided on the extension rod which is opposite to the first end portion and is provided on the cymbal extension rod. A second end portion, which can be retracted relative to the first end portion, and allows the seat back frame to use the pivot joint portion as a pivot center to generate an angle adjustment with respect to the seat unit. [Embodiment] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the four preferred embodiments with reference to the drawings. Before the new model is described in detail, it should be noted that in the following description, similar elements are represented by the same number. / Figure 3 and Figure 4. This new type of wheelchair with a seat back elevation angle adjustment example “Car Scoop Target” includes a wheel stand unit $ 10, and a seat unit 2 located above the wheel unit unit 2 〇 and a linear actuator 30 pivotally connected to the seat unit ⑼. > The wheel frame unit 10 has a frame U provided in the horizontal direction and a wheel body 12 provided on the bottom of the frame 11 with several axes. The 50H seat has a bottom support frame 21 and a seat back frame 22 extending upward from the bottom support frame 21. M270801 The bottom support swing 21 has two fascia plates 211 arranged in parallel and extending from the side portion upwards, corresponding to the pivot plates 211, the positioning rods 212 extending from the page portion and extending in the -rearward direction, -the pivot joint A buckle plate 213 on the positioning rod 212 and a spring 214 providing elasticity of the buckle plate 213. Each of these pivot plates 2 has a pivot joint portion 215 at the top and on the side of the mosquito bit 212. The positioning member has a recess 216 provided in a rearward direction and opening in one direction, and the buckle plate 213 has a pivot portion 217 pivotally connected to the inside of the recess 216, and is located on the pivot portion 217 side. And the hook 218 corresponding to the inset groove 216, a trigger part processing factory located on the other side of the pivot portion 217 and opposite to the hook 218, the seat back frame 22 has a movable pivot connected to the The bottom end portion 221 on the frame connecting portion 215 of the pivot plate 2—a top end portion 222 extending upward from the bottom end portion 221, —an extension rod 223 adjacent to the top end portion 222 and extending in the rear direction, the extension # 223 is disposed above the positioning lever 212 corresponding to the positioning lever 212. The linear actuator 30 of this embodiment is an electric cylinder as an example, and a long direction thereof corresponds to the seat back frame 22, and has a shaft provided on the positioning rod 212 as a first end portion 31 of the cylinder body and a The second end portion 32 is opposite to the first end portion 31 and is axially disposed on the extension rod 223. The first end portion 31 has a shaft pin 31 that can be nested in the groove 216 and can be buckled by the card 218. The second end portion 32 can be retracted relative to the first end portion 31. As shown in FIG. 3 and FIG. 4 again, when the assembly of the linear actuator is completed, the second end portion 32 is pivotally disposed on the end portion of the extension rod ，, and the shaft pin 311 of the first end portion 31 is Embedded in the ㈣ 216, and the hook 218 provided by the elastic plate 214 to provide the gusset plate 213 can be buckled on the shaft pin 3m, urging M270801 to make the first end portion 31 shaft-like-& + θ 柘It is positioned on the positioning rod 212. In addition, FIG. 3A shows a state where the linear actuator 30 ^ ^ L is retracted relative to the first end portion 31, and at this time, the chair frame 22 is set upright. And when the author wants to adjust the old angle P of the seat back frame 22, as shown in FIG. 5, the linear actuator 30 can be activated, and the second end portion 32 is generated relative to the first end portion 1. With the retracting action, the top end portion 222 of the seat back frame can use the planting portion 215 as a pivot center to generate an angle adjustment action relative to each of the bottom support frame 21, and the purpose of adjusting the seat back elevation angle is achieved. ▲ Also relying on the operation of linear transmission H 3G, the elevation angle ㈣ of the shooting frame 22 is not only quite easy ', but also the positioning of the backrest frame 22 after adjustment is good, it is safe to use, and it is quite easy to operate. As shown by the solid line in FIG. 6 again, when the wheelchair is temporarily unused and the backrest frame 22 is intended to be folded over the bottom support 21, the operator can press the trigger portion 219 'of the buckle plate 2n upward to prompt The hook 218 can be disengaged from the shaft pin 3ΐι, and then the shaft lock 311 can slide out of the recess 216, and the first end portion 31 of the linear actuator 30 and the positioning rod 212 are disengaged. The operator can then pull the seat back frame 22 toward the bottom support frame 21 (as shown by the imaginary line in Fig. 6) to achieve the folding purpose. When it is intended to be reused, the seat back frame 22 only needs to be re-used. Pull up and press the buckle plate 213 again so that the shaft pin 311 can be snapped into the recess 216 again, and when the force on the buckle plate 213 is released, the hook 218 of the buckle plate 213 can return to the shaft pin 311 again. As shown in FIG. 7 and FIG. 8, the second embodiment of the present invention is substantially the same as the first embodiment except that the linear actuator 30 of the second embodiment has a pair of corresponding first ends. Part 31, the first rod member 33, and a pair of second end portions 32, M270801 and the first-defending member 33, each other first, H "brothers a piece of 34 ,, A sleeve provided in the member 33 #, 34, cinch ring socket 35 at% 'quick release set 36 ,. The meaning of "bundle mounting" makes ^ 4 田 # for the quick release group 36, when it is released, that is,
使侍該第二桿件34， J 且使料•加 于於忒第一#件33，產生伸縮動 且便该椅背架22達到仰 後，再择角的凋整目的。且調整至預定角度 丹雜作该快拆組36，呈 的仰角獲得固定。 閉鎖狀態，即可使該椅背架22 具有一又= 斤示，本新型第三實施例的線性傳― 端部31”的第—桿件33”、—對應該第二 ^人 桿件Μ及—供該第―、二桿件33，，、34”反 向“的螺接件35”。該第一、二桿件33 ”、Μ”各具有一可 螺1在該螺接件35，，一雙向螺孔35Γ，内部的螺紋部331”、 ⑷。當操作轉動該螺接件35，，時，可使得該第―、二桿件 33’，、34”產生相向或反向的移動動作，且使該椅背架 到仰角的調整目的。 如圖10、圖11所示，本新型第四實施例的線性傳動器 綱具有_對應該第一端部31〇的第一桿件规、—對應該( 第二端部320且與該第—桿件33〇互相套接的第二桿件= 、一迫緊定位在第一桿力330頂部的偏心接帛35〇及一套 設在該偏心接頭350外部且可適時對第二桿# 34〇產生迫 樓的偏心滑塊360。當操作該第一、二桿彳33〇、34〇產生 相反旋轉時，該偏心滑塊360與偏心接頭35〇之一迫撐盤 如會共同外樓該第二桿件34G，使第—、二桿件33()、牙34〇 獲得定位，當操作該第-、二桿件33〇、34()產生相向轉動 10 M270801 ，使偏心滑塊360及迫撐盤35()會解除對第二桿件34〇的 L緊作用即可使彳于第一桿件340相對於第一桿件330產 生收合或伸長，且使該椅背架22達到仰角的調整目的。 惟以上所述者，僅為本新型之較佳實施例而已，當不 能以此限定本新型實施之範圍，即大凡依本新型申請^利 範圍及新型說明内容所作之簡單的等效變化與修飾，皆仍 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1是現有一種輪椅的平面組合圖 是該種輪椅的局部放大剖面示意圖； 圖 圖3是-平面組合圖，說明本新型具有椅背仰角調整 之輪椅的一第一較佳實施例； 圖4是本新型上述較佳實施例之—局部立體分解示竟 圖，說明一線性傳動器利用一扣板擋扣定位； “ 圖5是本新型上述較佳實施例之_調整示意圖， 一椅背架相對於一抵支撐架產生角度調整； Φ …圖6是本新型上述較佳實施例之一收折示意圖，說明 ^椅背架相對於該底支撐架產生收折疊合； 〃圖7是本新型具有椅背仰角調整之輪椅一第二較 把例的一平面組合圖； 圖8是本新型第二較佳實施例之線 解圖； 土得動為的立體分 一第三較佳實 圖9是本新型具有椅背仰角調整之輪待 施例的一平面組合圖； M270801 圖ίο是本新型具有椅背仰角調整之輪椅一第四較佳實 施例的一平面組合圖；及 圖11是本新型第四較佳實施例之線性傳動器的立體分 解圖。 12 M270801 【主要元件符號說明】 10 輪架單元 3Γ 第一端部 11 框架 329 第二端部 12 輪體 335 第一桿件 20 座椅單元 34” 第二桿件 21 底支撐架 359 束環 211 才區板 365 快拆組 212 定位桿 30，， 線性傳動器 213 扣板 31，， 第一端部 214 彈簧 32，， 第二端部 215 樞接部 33，， 第一桿件 216 嵌槽 331，， 螺紋部 217 樞轉部 34，， 第二桿件 218 卡勾 341，， 螺紋部 219 扳動部 35，， 螺接件 22 椅背架 351，， 雙向螺孔 221 底端部 300 線性傳動器 222 頂端部 310 第一端部 223 延伸桿 320 第二端部 30 線性傳動器 330 第一桿件 31 第一端部 340 第二桿件 311 軸銷 350 偏心接頭 32 第二端部 351 迫撐盤 30? 線性傳動器 360 偏心滑塊 13The second lever member 34, J and the material • are added to the first # 33 member, generating a telescopic movement, and then the seat back frame 22 is raised, and then the angle is adjusted. And adjusted to a predetermined angle, Dan miscellaneous as the quick release group 36, the elevation angle of the obtained is fixed. In the locked state, the seat back frame 22 can be provided with the weight of the third embodiment of the third embodiment of the present invention-the first rod 33 "of the end portion 31", corresponding to the second rod member M And—for the first and second rod members 33 ,, and 34 "reverse" screwing members 35 ". The first and second rod members 33", M "each have a screwable 1 in the screwing member 35 , A two-way screw hole 35Γ, an internal thread portion 331 ″, ⑷. When the screw connection member 35 is operated and rotated, the first and second lever members 33 ', 34 "can be caused to move in opposite or opposite directions, and the seat back frame can be adjusted to the elevation angle. 10. As shown in FIG. 11, the linear actuator according to the fourth embodiment of the present invention has a first rod gauge corresponding to the first end portion 31, a corresponding second end portion 320 and the first rod portion. The second rod piece which is sleeved with each other = 30, an eccentric coupling 35 which is positioned tightly on the top of the first rod force 330, and a set provided outside the eccentric joint 350 and can be timely generated for the second rod # 34〇 The eccentric slider 360 of the forced floor. When the first and second levers 33 and 34 are operated to rotate in the opposite direction, one of the eccentric slider 360 and the eccentric joint 35 is forced to support the second rod outside the building. Piece 34G, so that the first and second levers 33 () and teeth 34 ° are positioned. When the first and second levers 33 and 34 () are operated, they rotate 10 M270801 in opposite directions, so that the eccentric slider 360 and the forced support plate 35 () will release the L-tightening effect on the second lever member 34o, so that the first lever member 340 can be collapsed or extended relative to the first lever member 330, and The seat back frame 22 achieves the purpose of adjusting the elevation angle. However, the above are only the preferred embodiments of the present invention. When the scope of the implementation of the present invention cannot be limited by this, that is, the scope of application and the description of the new application The simple equivalent changes and modifications made to the content are still within the scope of the new patent. [Brief description of the drawings] Figure 1 is a plan view of a conventional wheelchair, which is a partially enlarged cross-sectional schematic diagram of the wheelchair; 3 is a plane combination view illustrating a first preferred embodiment of the new type of wheelchair with a seat back elevation angle adjustment; FIG. 4 is a partial three-dimensional exploded view of the preferred embodiment of the new type, illustrating a linear actuator Positioning using a gusset plate; "Fig. 5 is a schematic diagram of the adjustment of the above-mentioned preferred embodiment of the present invention, an angle adjustment of a seat back frame relative to an abutting support frame; Φ ... Fig. 6 is the above-mentioned preferred embodiment of the present invention A folding diagram showing the folding of the seat back frame relative to the bottom support frame; 〃 FIG. 7 is a plane group of a second comparative example of a wheelchair with a seat back elevation adjustment Fig. 8 is a line diagram of the second preferred embodiment of the present invention; a three-dimensional one of the third preferred embodiment of the present invention; Fig. 9 is a plane combination of the wheel of the present invention with a seat back elevation angle adjustment to be implemented Fig. M270801 Fig. Ο is a plane combined view of a fourth preferred embodiment of the new wheelchair with a seat back elevation angle adjustment; and Fig. 11 is an exploded perspective view of the linear actuator of the fourth preferred embodiment of the new invention. 12 M270801 [Description of main component symbols] 10 Wheel frame unit 3Γ First end portion 11 Frame 329 Second end portion 12 Wheel body 335 First lever member 20 Seat unit 34 "Second lever member 21 Bottom support frame 359 Beam ring 211 Only Zone plate 365 Quick release group 212 Positioning rod 30, Linear actuator 213 Buckle plate 31, First end 214 Spring 32, Second end 215 Pivot 33, First bar 216 Recessed groove 331, Threaded part 217 Pivot part 34, Second lever 218 Hook 341, Threaded part 219 Trigger part 35, Threaded part 22 Seat back frame 351, Two-way screw hole 221 Bottom end part 300 Linear actuator 222 top end 310 first end 223 extended Rod 320 Second end 30 Linear actuator 330 First lever 31 First end 340 Second lever 311 Shaft pin 350 Eccentric joint 32 Second end 351 Forced disc 30? Linear actuator 360 Eccentric slider 13