M345537 八 新型說明： 【新型所屬之技術領域】 本創作係有關於-種電動按摩椅— 按料 身結構 【先前技術】 按’現代人生活忙碌，在經年累月的神經緊端下 導致身體賴肌肉_的錄發生，尤其是從事勞力 及長:間保持單一姿勢者，更常產生全身肌肉酸痛之毛病 ，另隨者社的增長’-些筋f痠鮮絲亦會伴隨而來 ’於是各式各翻按摩_應而生，_提供使用者坐躺 進行按摩促進血液彳«、舒㈣骨，達_除疲勞及紆解 麼力的目的。目前的按摩椅主要是針對腰部以上之按摩而 設計’並將終部份作增厚及柔軟度處理，令錢者能舒 舒服服坐在按摩椅上享受按摩㈣趣及效果，此一情形下 對於年紀較長或行動不便的使用者而言，固可享受按摩 上的樂趣’但在按摩後欲自按摩椅起身時，則目其本身行 動不便而無法輕胃起來，甚至必彡貞由他人參攙扶才能自按 摩椅起身，此乃造成自身及他人的相當麻煩與不便，尤其 若使用者身軀較為龐大時，往往非一人之力所能將之攙扶 起來，導致易發生跌倒摔傷之意外。 因此’按摩椅業者乃設計出一種由馬達驅動，除可傾 斜臥躺外更可前傾一適當角度，令使用者得以順著重心前 傾而輕易自按摩椅起身，如中華民國申請案號第88216920 M345537 號（公告編號第407475號）之新型專利案，即為一種習知之 按摩椅輔助起身結構，其包括有：一底座；一組椅座骨架 ’其後端結合有支撐桿；至少二組椅座連桿組，其包括有 複數第-連才干與複數第二連桿，且該第一連桿係槐設於前 述的椅座骨架，該第二連桿係樞設於前述的底座，又於該 • 帛-連桿樞設有—第三連桿；-組椅背骨架，其樞接於前 - 義椅座骨架後端；至少二組椅背連桿組，其包括有一搞 • 接於前述椅背骨架的第一連桿、-樞接於該第-連桿的第 2連桿、-樞接於該第三連桿的第二連桿及_樞接於該第 一連桿與第二連桿的第四連桿，藉由該第一、二、三、四 連桿構成四連桿組，且該第四連桿樞接於前述的第三連桿 、，-鴻力裝置，包括有-外管，以及穿設於該外管内的 •内管，該外管的一端係樞設於前述的底座，該内管的一端 則樞設於前述的第三連桿；該内管位於外管内的適當長度 設有螺桿，另外設有-電動馬達，該電動馬達結合有一驅 鲁 _桿’並使該驅動螺桿嗜合於該内管的螺桿，藉由該電 動馬達運轉時驅動該内管旋轉並能在外管内轴向地伸縮； ， 藉由上述之結構，當該電動馬達運轉而控制内管作動而收 ， 縮時，得以令該椅背骨架往後方翻仰，而當該電動馬達作 動而伸出時，則可使椅座骨架與椅背骨架往前方掀高成傾 斜。 惟，該種習知按摩椅輔助起身結構，於實際應用上， 存在有以下之缺失： 1.其係利用連桿機構及單支驅動桿驅動，耐重性不夠 M345537 ，以致起身«產生錢，造成年紀較長或行動不便的使 用者有跌倒之危險性，實用性不佳。 2.其設有至少二崎錢桿組及至少二纟頌背連桿级 ，鰣座連桿組包括有複數第—連桿與複數第二連桿，又 於第-連桿樞設有-第三連桿，該椅背連桿組包括有一第 • =連桿、—樞接於該第-連桿的第三連桿、—樞接於該第 - 2連桿的第二連桿及-樞接於該第-連桿與第二連桿的第 • 日連桿，整體組成構件多，並且連結組配關係複雜，製造 成本而。 【新型内容】 本創作人有鑑於習知按摩椅輔助起身結構，其耐重性 . 销’起身時易有搖晃之情形’並且結構複雜，製造成本 同，是以乃思及創作的意念，經多方探討設計與試作樣品 試驗，及多次修正改良後，終設計出本創作。 本創作提供一種按摩椅辅助起身結構，其係由一基座 _ 部枢組—座墊架’錄架後雛組-椅背架，前侧樞組 一腳靠架，該基座與座墊架間藉由兩侧之χ形連桿機構樞 ， 接，兩連桿機構間架設一橫桿連接，而於該橫桿與基座間 . 樞設一第一伸縮驅動裝置，第一伸縮驅動裝置旁側結合一 第一限位觸動開關，用以帶動調整座墊架之傾仰角度，座 塾架與椅背架間另樞設一第二伸縮驅動裝置，第二伸縮驅 動裝置旁側結合一第二限位觸動開關，用以帶動調整椅背 架之傾仰角度，椅背架與腳靠架間樞設至少一連動桿，使 腳靠架隨椅背架之傾仰角度同步連動。 M345537 本創作之主要目的，在於其係由兩伸縮驅動裝置搭配 兩側設置之X形連桿機構，達到控制按摩椅各部位之傾仰 角度之調整’耐重性高’作動時動作流暢、穩固，而具有 較佳之使用安全性及實用性。 本創作之次一目的，在於其係由兩伸縮驅動裝置搭配 - 兩側設置之X形連桿機構，達到控制按摩椅各部位之傾仰 • 角度之調整，整體組成構件少，並且連結組配關係簡單， Φ 製造成本降低。 本創作之另一目的，在於其第一及第二伸縮驅動裝置 旁侧分別設有一組限位觸動開關，而可控制座墊架與椅背 架接續作動，令起身及復歸動作更加平穩舒適。 【實施方式】 餘下，茲配合圖式將本創作較佳實施例詳細說明如后 如第一圖本創作之立體圖、第二圖本創作之後視立體 Φ 圖、第二圖本創作之側視平面圖及第四圖本創作調整呈起 身狀態之立體圖所示，本創作按摩椅係由一基座（1)頂部 . 樞組一座墊架（2)，座墊架（2)後側樞組一椅背架（3)，前 側樞組一腳靠架（4)，該基座（1)與座墊架（2)間係藉由兩 側之X形連桿機構（5)樞接，基座（1)設有一底架（η)，底 架（11)兩側各豎立一側架（12)，底架（11)近中央處設有一 樞接座（111)，兩侧架（12)内側面各設有一道往前往後漸 低傾斜之滑槽（121)，兩側架（12)前端適當高度間架設一 固疋桿（13)，固定桿（13)近兩端處各設有一樞接座（131) M345537 ，座塾架（2)係一平面框架，兩侧框條（21)内側面設有對 應之滑槽（211)，兩滑槽（211)間設置一兩端具滑輪而可自 由滑動之滑桿（22) ’兩側框條（21)外側面固結有一鳩尾狀 母套合件（212)，而可供結合對應公套合件之扶手簡易套 合卡固組裝，前框條（23)後側面設有一樞接座（231)，椅 * 背架（3)底部設有兩樞接座(31)、（32)，腳靠架（4)底面設 • 置一樞接座（41)，X形連桿機構（5)係由第一連桿（51)與 • 第二連桿（52)中間處相互樞接組成，兩X形連桿機構（5) 之第一連桿（51) —端分別與基座（1)固定桿（13)近兩端處 之樞接座（131)樞接，且於該端内側一段間架設一橫桿（53 )，橫桿（53)中段處設置一樞接座（531)，第一連桿（51)另 端分別與座墊架（2)滑桿（22)近兩端處焊揍固結，兩X形 連桿機構（5)之第二連桿（52)—端分別與座墊架（2)兩側框 條（21)内側面近前端處樞接，另端分別以一軸桿結合一滑 輪滑設於基座（1)兩側架（12)内側面之滑槽（121)中，再者 鲁於上述基座（1)底架（11)近央處之樞接座（HD與橫桿（53) 中段處之樞接座（531)間樞設一第一伸縮驅動裝置（6)，該 、 第一伸縮驅動裝置（6)旁側結合一第一限位觸動開關（61) ，座墊架（2)前框條（23)後側面之樞接座（231)與椅背架（3 )底部之樞接座（31)間樞設一第二伸縮驅動裝置（？），該第 一伸縮驅動裝置（7)旁側結合一第二限位觸動開關（71)， 椅背架（3)底部之另一樞接座（32)與腳靠架（4)底面之樞接 座（41)間設置一連動桿（8)樞接，且該連動桿兩端樞結處 係設為長條狀樞結孔。 M345537 田欲口周正按摩椅呈起身狀態時，請配合參閲第五圖本 創作之调整動作示意圖、第六圖本創作調整呈起身狀鮮之 側視平面圖及第七圖本創作起身狀態之實施例圖，可:控 制器控制第二伸_練置⑺收縮，帶轉㈣⑶往前 调整至適當傾仰肖度，及藉義桿⑻連_靠架⑷往下 樞轉至定位，此時第二伸、_練置⑺旁側結合之第二 限位觸動開關⑻受觸動而傳達訊號至控制器，停止第= ^縮驅動裝置⑺作動，同時控制第一伸縮驅動袭置⑹接 著伸長’推動兩X形連桿機構⑸之第一、二連桿⑼、（ 52)往直立方向樞轉’進而帶動座墊架⑵連同椅背架⑶ =掀起至適當傾仰角度，即調整呈起身狀態；另當欲復 知時’則由控制器控制第一伸縮驅動裝置⑹收縮，藉由 兩X形連桿機構⑸之第―、二連桿（51)、⑽往料方 向樞轉，帶動座墊架⑵連同椅背架⑶往後樞轉至適當傾 仰角度，而於第-伸縮驅動裝置⑹旁側結合之第一限位 觸動開關（61)受觸動時，傳達訊號至控制器，停止第一伸 縮驅動裝置⑹作動，再由第二伸縮驅動裝置⑺帶動椅背 架⑶往後調整至適當傾仰角度，及藉連動桿⑻連動腳靠 架（4)往上樞轉至定位，完成復歸動作。 本創作之扶手係結合於座墊架⑵兩侧框條⑵）外側 面之套合件（212)上，當按摩椅調整呈起身狀態時，兩側 扶手可隨錄架⑵时縣傾仰，㈣有難之安全性 ’避免使用者往一側跌倒。 由上述具體實施例之結構，可得知本創作具有下述之 M345537 效益： 1·其係由兩伸縮驅動裝置（6)、（7)搭配兩側設置之乂 形連桿機構（5)，達到控制座墊架（2)、椅背架（3)與腳靠 架（4)傾仰角度之調整，耐重性高，而可令按摩椅之起身 、復歸動作流暢、穩固，而具有較佳之使用安全性及實用 - 性。 - 2·其係由兩伸縮驅動裝置（6)、（7)搭配兩側設置之乂 • 形連桿機構（5)，達到控制座墊架（2)、椅背架（3)與腳靠 架（4)傾仰角度之調整，整體組成構件少，並且連結組配 關係間單，製造成本降低，而符合經濟效益。 3·第一及第二伸縮驅動裝置（6)、（7)旁側分別設有一 組限位觸動開關（61)、（71)，而可控制座墊架（2)與椅背 架（3)於起身及復歸時以適當順序接續作動，令起身及復 歸動作更加平穩舒適。 綜上所述，本創作確實已經達於突破性之結構，而具 _ 冑改良之創作内容，同時又賴達到產社利用性與進步 性，且本創作未見之於任何刊物，亦具新穎性，當符合專 - 侃之規定，爰依法提出新型專利申請，懇請鈞局審查 委貝授予合法專利權，至為感禱。 唯以上所述者，僅為本創作之較佳實施例而已，當不 能以之限定本創作實施之範圍；即大凡依本創作申請專利 範圍所作之均等變化與修飾，皆應仍屬本創作專利涵蓋之 範圍内。 【圖式簡單說明】 M345537 第一圖：係本創作之立體圖。 第二圖：係本創作之後視立體圖。 第三圖：係本創作之側視平面圖。 第四圖：係本創作調整呈起身狀態之立體圖。 第五圖：係本創作之調整動作示意圖。 第六圖：係本創作調整呈起身狀態之側視平面圖。 第七圖：係本創作起身狀態之實施例圖。 【主要元件符號說明】 1 基座 11 底架 12 側架 121 滑槽 13 固定桿 131 樞接座 2 座墊架 21 側框條 211 滑槽 212 母套合件 22 滑桿 23 前框條 231 樞接座 3 椅背架 31 樞接座 32 極接座 4 腳靠架 41 樞接座 5 連動機構 51 第一連桿 52 第二連桿 53 橫桿 531 極接座 6 第一伸縮驅動裝置 61 第一限位觸動開關 7 第二伸縮驅動裝置 71 第二限位觸動開關 8 連動桿 12M345537 Eight new descriptions: [New technical field] This creation department has a kind of electric massage chair - according to the structure of the material [previous technique] According to the 'modern life is busy, the body is under the nerves of the years and the muscles are caused by the muscles _ The occurrence of the record, especially in the labor and long: between the maintenance of a single posture, more often the cause of muscle aches and pains, and the growth of the follow-up society - some of the gluten fresh acid will also accompany - so all kinds of Turning the massage _ should be born, _ provide users to sit and massage to promote blood 彳 «, Shu (four) bone, up to _ remove fatigue and relieve the power of the purpose. The current massage chair is mainly designed for the massage above the waist and the final part is thickened and softened, so that the money can comfortably sit on the massage chair and enjoy the massage (four) fun and effect. Under this situation For those who are younger or less inconvenient, they can enjoy the massage. But when they want to get up from the massage chair after the massage, they can’t move their stomachs and they can’t get light, even if they Ginseng can help get up from the massage chair, which is quite troublesome and inconvenient for itself and others. Especially if the user's body is relatively large, it is often impossible for one person to support it, resulting in an accident that falls and falls. Therefore, the 'massage chair manufacturer is designed to be driven by a motor. In addition to tilting and reclining, it can be tilted forward at an appropriate angle, so that the user can easily get up from the massage chair with a forward leaning, such as the application for the Republic of China. The new patent case of 88216920 M345537 (Announcement No. 407475) is a conventional massage chair auxiliary lifting structure, which comprises: a base; a set of seat frame 'the rear end is combined with a support rod; at least two sets The seat link set includes a plurality of first-connected trunks and a plurality of second links, and the first link is disposed on the seat frame, and the second link is pivotally disposed on the base. Further, the 帛-link is pivoted with a third link; a set of back frame, which is pivotally connected to the rear end of the front seat frame; at least two sets of seat back link sets, including one engaging a first link connected to the back frame of the chair, a second link pivotally connected to the first link, a second link pivotally connected to the third link, and a pivotal connection to the first link a fourth link of the rod and the second link, and the fourth link is formed by the first, second, third and fourth links And the fourth connecting rod is pivotally connected to the third connecting rod, the - Hong force device, including the outer tube, and the inner tube penetrating the outer tube, the one end of the outer tube is pivoted In the foregoing base, one end of the inner tube is pivotally disposed on the third connecting rod; the inner tube is provided with a screw at an appropriate length in the outer tube, and an electric motor is additionally provided, and the electric motor is combined with a driving rod. 'and the driving screw is associated with the screw of the inner tube, and the inner tube is rotated when the electric motor is operated and can be axially expanded and contracted in the outer tube; and by the above structure, the electric motor is controlled to operate When the inner tube is actuated and retracted, the back frame of the chair can be tilted backwards, and when the electric motor is extended to extend, the seat frame and the back frame can be tilted forward. However, this kind of massage chair assists the body structure, in practical application, there are the following shortcomings: 1. It is driven by the linkage mechanism and a single drive rod, and the weight resistance is not enough M345537, so that getting up «produces money, causing Users who are older or have limited mobility are at risk of falling and have poor applicability. 2. It is provided with at least two Saki money pole sets and at least two 纟颂 back link stages, and the squatting link set includes a plurality of first-links and a plurality of second links, and is also pivoted on the first-links - a third link, the seat back link set includes a first link, a third link pivotally connected to the first link, and a second link pivotally connected to the second link - The first-day link pivotally connected to the first link and the second link has a large number of integral components, and the connection and assembly relationship is complicated, and the manufacturing cost is high. [New content] The creator has the weight-resistance of the massage chair assisted to get up. The pin 'easy to shake when getting up' and the structure is complicated, the manufacturing cost is the same, it is the idea of creation and creation. After discussing the design and trial sample test, and after many corrections and improvements, the final design of the creation. The present invention provides a massage chair assisted lifting structure, which is composed of a base _ a pivot group - a seat cushion frame, a rear frame group - a seat back frame, a front side pivot group and a foot rest frame, the base and the seat cushion The frame is pivoted by the shackles of the two sides, and a crossbar is connected between the two link mechanisms, and a first telescopic drive device is pivoted between the crossbar and the base. The first telescopic drive device is pivoted. The side is combined with a first limit touch switch for driving the tilting angle of the seat cushion frame, and a second telescopic driving device is further disposed between the seat frame and the seat back frame, and the second telescopic driving device is coupled to the side of the second telescopic driving device. The second limit touch switch is configured to adjust the tilting angle of the seat back frame, and at least one linkage bar is pivoted between the back frame and the footrest frame, so that the footrest frame is synchronously linked with the tilting angle of the seat back frame. M345537 The main purpose of this creation is that it is equipped with two telescopic driving devices with X-shaped linkages arranged on both sides to achieve the adjustment of the tilting angle of each part of the massage chair. The 'high weight resistance' is smooth and stable when it is actuated. It has better use safety and practicality. The second purpose of this creation is that it is equipped with two telescopic drive devices - X-shaped linkage mechanism on both sides, to control the tilting and angle adjustment of each part of the massage chair, the overall composition of the components is small, and the connection is matched The relationship is simple, Φ manufacturing costs are reduced. Another purpose of the creation is that a plurality of limit touch switches are respectively arranged on the side of the first and second telescopic driving devices, and the seat cushion frame and the seat back frame can be controlled to be continuously operated, so that the lifting and returning movements are more stable and comfortable. [Embodiment] In the following, the preferred embodiment of the present invention will be described in detail with reference to the drawings, and the perspective view of the second figure, the second picture, the second picture, and the second picture. And the fourth picture shows the three-dimensional diagram of the creation adjustment, the creation massage chair is composed of a base (1) top. The pivot group has a cushion frame (2), the seat cushion frame (2) the rear side pivot group The back frame (3), the front side pivot group and the foot rest frame (4), the base (1) and the seat cushion frame (2) are pivotally connected by the X-shaped link mechanism (5) on both sides. The base (1) is provided with a bottom frame (n), and one side frame (12) is erected on both sides of the bottom frame (11), and a pivoting seat (111) is arranged near the center of the bottom frame (11), and the two sides frame (12) The inner side is provided with a sliding groove (121) which is inclined downward toward the rear, and a fixed mast (13) is arranged between the appropriate heights of the front ends of the two side frames (12), and the fixing rods (13) are respectively arranged at the two ends There is a pivoting seat (131) M345537, the truss (2) is a plane frame, the inner side of the side frame strips (21) is provided with corresponding sliding slots (211), and two ends are arranged between the two sliding slots (211) With pulleys Sliding slider (22) 'The outer side of the two side frame strips (21) is fixed with a dovetail-shaped female fitting (212), and the armrest can be assembled with the corresponding armrests of the corresponding male fittings. The rear side of the strip (23) is provided with a pivoting seat (231), and the bottom of the backrest frame (3) is provided with two pivoting seats (31) and (32), and the bottom of the footrest frame (4) is provided with a pivotal connection. The seat (41), the X-shaped link mechanism (5) is composed of a first pivotal connection between the first link (51) and the second link (52), and the first of the two X-shaped link mechanisms (5) The connecting rods (51) are respectively pivotally connected to the pivoting seats (131) at the proximal ends of the fixing rods (13) of the base (1), and a crossbar (53) is arranged between the inner ends of the connecting ends, the crossbar (53) A pivoting seat (531) is arranged at the middle section, and the other ends of the first connecting rod (51) are respectively welded and fixed at the proximal ends of the sliding frame (22) of the seat cushion frame (2), and the two X-shaped connecting rods are respectively The second link (52) end of the mechanism (5) is respectively pivotally connected to the front end of the inner side of the frame strips (21) of the seat cushion frame (2), and the other ends are respectively slidably connected with a pulley by a shaft. Block (1) in the chute (121) on the inner side of the side frame (12), and then in the above base (1) The first telescopic driving device (6) is pivoted between the pivoting seat (the HD) and the pivoting seat (531) at the middle of the crossbar (53) at the near end of the chassis (11). The driving device (6) is coupled with a first limit touch switch (61), a pivoting seat (231) on the rear side of the front frame strip (23) of the seat frame (2), and a pivot at the bottom of the back frame (3). A second telescopic driving device (?) is pivoted between the sockets (31). The first telescopic driving device (7) is coupled to a second limit touch switch (71) on the side, and the bottom of the seat back frame (3). A pivoting joint (32) is pivotally connected with the pivoting seat (41) of the bottom surface of the footrest frame (4), and the pivoting joints at both ends of the connecting rod are set as long strips. hole. M345537 When the Tianzheng massage chair is in the up state, please refer to the fifth picture. The adjustment action diagram of this creation, the sixth picture. The original adjustment of the creation is a side view and the seventh picture. For example, the controller can control the second extension _ practice (7) contraction, belt rotation (4) (3) to adjust to the appropriate tilting degree, and the lever (8) to _ the frame (4) pivot down to the position, at this time The second limit and _ practice (7) side of the second limit touch switch (8) is touched to transmit a signal to the controller, stop the = contraction drive (7) to act, while controlling the first telescopic drive (6) and then elongate 'push The first and second links (9) and (52) of the two X-shaped link mechanisms (5) pivot in the upright direction to drive the seat cushion frame (2) together with the seat back frame (3) to be lifted to an appropriate tilting angle, that is, adjusted to be in a raised state; In addition, when it is to be known, the first telescopic drive device (6) is controlled by the controller to be contracted, and the first and second links (51) and (10) of the two X-shaped link mechanisms (5) are pivoted in the feed direction to drive the seat cushion. The frame (2), together with the seat back frame (3), pivots back to the appropriate tilting angle, When the first limit touch switch (61) coupled to the side of the first telescopic drive device (6) is touched, the signal is transmitted to the controller, the first telescopic drive device (6) is stopped, and the second telescopic drive device (7) drives the chair. The back frame (3) is adjusted to an appropriate tilting angle, and the footrest (4) is pivoted upward to the positioning by the linkage lever (8) to complete the returning operation. The handrail of the present invention is combined with the sleeve member (212) on the outer side of the frame strip (2) on both sides of the seat cushion frame (2). When the massage chair is adjusted to be in the up state, the handrails on both sides can be tilted with the record holder (2). (4) Difficult safety - Avoid users falling to one side. According to the structure of the above specific embodiment, it can be known that the creation has the following M345537 benefits: 1. The two telescopic driving devices (6) and (7) are matched with the double-shaped connecting rod mechanism (5) disposed on both sides. The adjustment of the tilting angle of the seat cushion frame (2), the seat back frame (3) and the footrest frame (4) is achieved, and the weight resistance is high, and the lifting and returning movement of the massage chair can be smooth and stable, and is better. Use security and practicality - sex. - 2·The two telescopic drive units (6) and (7) are equipped with the 乂•-shaped linkage mechanism (5) provided on both sides to reach the control seat cushion frame (2), the seat back frame (3) and the footrest The adjustment of the tilt angle of the frame (4) has fewer components, and the connection between the components is reduced, and the manufacturing cost is reduced, which is economical. 3. The first and second telescopic driving devices (6) and (7) are respectively provided with a set of limit touch switches (61) and (71), and the seat cushion frame (2) and the seat back frame can be controlled (3). ) In the proper sequence to start and return, the movements of the body and the return are smoother and more comfortable. In summary, this creation has indeed reached a breakthrough structure, and has the content of _ 胄 improved creation, but also depends on the utilization and progress of the production and use, and this creation is not seen in any publication, but also novel Sexuality, when it meets the requirements of the special- 侃, 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出 提出The above is only the preferred embodiment of the present invention, and the scope of the creation of the creation cannot be limited by it; that is, the equal variation and modification of the patent application scope of this creation should still belong to the creation patent. Within the scope of coverage. [Simple description of the diagram] M345537 The first picture: a perspective view of the creation. The second picture: a stereoscopic view of the creation. Third picture: A side view of the creation. The fourth picture: a perspective view of the creation of the creation of the body. The fifth picture is a schematic diagram of the adjustment action of this creation. Figure 6: A side plan view of the creation adjustment in a state of getting up. Figure 7: An example of the embodiment of the creation of the body. [Main component symbol description] 1 Base 11 Base frame 12 Side frame 121 Chute 13 Fixing rod 131 Pivot seat 2 Seat frame 21 Side frame strip 211 Chute 212 Female fitting 22 Slider 23 Front frame strip 231 pivot Rack 3 Chair back frame 31 Pivot seat 32 Pole block 4 Foot stand 41 Pivot seat 5 Linkage mechanism 51 First link 52 Second link 53 Cross bar 531 Pole block 6 First telescopic drive 61 a limit touch switch 7 second telescopic drive device 71 second limit touch switch 8 linkage bar 12