201208612 六、發明說明： 【發明所屬之技術領域】 子本發明係關於椅子’尤其是關於椅背可前後移動的椅 【先前技術】 . 隨著社會的進步，人們生活水準的提高，人們對工作、 生活的環境及用品有了更多及更高的要求。就拿椅子例如 辦a椅或其他座椅來說，日益出現了多樣化的設計以滿足 人們各種不同的需要：有可升降調節，有腰墊調節，有頭 枕調節’有椅背傾仰角度科。但是，現有技術的各 種椅子’其椅背都是與椅座直接連接或為一體化，或者藉 由支，桿件與椅座連接，這樣的椅子即使椅背可以相對椅 座調節，也僅相對椅座進行角度調節變化，以適合人們坐 直及後仰。目前，尚未出現椅背可相對椅座前後移動的椅 子。 * 【發明内容】 本發明所欲解決的問題在於避免上迷現有技術的不足 之處而提出一種椅背可前後移動的椅子，使用者可以根據 自己的需要對椅子椅背進行前後移動調節，以使椅背總是 與自己背部保持貼合而得到良好的舒適感。 本發明解決問題可透過採取以下技術手段來實現： 設計、製造一種椅背可前後移動的椅子，包含椅座及 201208612 椅背，該椅背下端與椅座相分離，椅背下端兩邊側與椅座 後端兩邊側之間分別藉由一套轉動機構予以連接，該轉動 機構的下端能相對椅座轉動調節，該轉動機構的上端能相 對椅背轉動調節，並且，在該轉動機構的轉動調節過程中， 該椅背僅相對椅座前後移動而椅背的豎直狀態始終保持不 變〇 作為本發明具體實施例進一步改進，該轉動機構包含 第一轉動桿件、第二轉動桿件、第一轉動關節件及第二轉 動關節件；該第一轉動桿件為中空型，大致上呈啞鈴狀， 上下兩端大而呈圓筒型，中間區段小而呈條狀；該第二轉 動桿件兩端分別具有圓孔；該第一轉動關節件大致上呈圓 柱狀，中間區段大而内外兩段小；該第一轉動關節件與該 椅背下端邊側的第一安裝座連接固定，第一轉動關節件的 内端嵌入該第一安裝座内；該第二轉動關節件也大致上呈 圓柱狀，中間區段大而内外兩段小，該第二轉動關節件與 該椅座後端邊側的第二安裝座藉由螺釘固定連接，第二轉 動關節件的内端嵌入該第二安裝座内；該第一轉動關節件 内沿徑向設有第一凹槽，且沿軸向設有第一轴孔；該第二 轉動桿件的上端位於該第一凹槽内，並藉由第一軸桿*** 該第一軸孔及第二轉動桿件上端的圓孔實現第二轉動桿件 與第一轉動關節件的可轉動連接；該第二轉動關節件内沿 徑向設有第二凹槽，且沿軸向設有第二軸孔，該第二轉動 桿件的下端位於該第二凹槽内，並藉由第二軸桿***該第 二軸孔及第二轉動桿件下端的圓孔實現第二轉動桿件與第 201208612 二轉動關節件的可轉動連接；該第一轉動桿件的上端套住 該第一轉動關節件的外端，該第一轉動桿件的下端套住該 第二轉動關節件的外端；該第一轉動桿件的上端具有第一 中心圓孔，第一轉動桿件的下端具有第二中心圓孔；該第 一轉動關節件上具有第一中心孔，該第二轉動關節件上具 有第二中心孔；該轉動機構還包含第一螺桿及第二螺桿， 該兩螺桿均僅尾段具有外螺紋，其餘桿段為光桿段；該第 一螺桿依序穿過該第一中心圓孔及該第一中心孔後再旋入 該第一安裝座内的螺孔内，該第二螺桿依序穿過該第二中 心圓孔及該第二中心孔後再旋入該第二安裝座内的螺孔 内，且確保該第一轉動桿件的上端能相對第一螺桿轉動、 第一轉動桿件的下端能相對第二螺桿轉動；第一中心孔及 第一軸孔的連線與第二中心孔及第二軸孔的連線相平行， 第一中心孔及第二中心孔的連線與第一轴孔及第二軸孔的 連線相平行。 該第一螺桿與第一中心圓孔之間、該第二螺桿與第二 中心圓孔之間，分別設有第一套筒及第二套筒；該第一套 筒及第二套筒的端部都設有鋸齒，且其鋸齒部分別嵌入到 該第一中心孔及第二中心孔内；裝有該第一套筒及第二套 筒後，該第一轉動桿件的上端相對第一套筒轉動、第一轉 動桿件的下端能相對第二套筒轉動。 該第一套筒與第一中心圓孔之間、該第二套筒與第二 中心圓孔之間，均設有隔音墊圈；該第一轉動桿件的上端 與該第一轉動關節件的外端之間設有第一隔音件，該第一 201208612 隔音件上設有用於該第一螺桿及第一軸桿通過的通孔；該 第一轉動桿件的下端與該第二轉動關節件的外端之間設有 第二隔音件，該第二隔音件上具有用於該第二螺桿及第二 軸桿通過的通孔；該第二轉動桿件的上端與第一轉動關節 件之間、第二轉動桿件的下端與第二轉動關節件之間，均 設有隔音片圈。 該轉動機構還包含外蓋，該第一轉動桿件的上端及下 端還蓋有圓形端蓋。 該第一轉動桿件及第二轉動桿件之間還設有第一彈 簧。 該第一轉動關節件的外端圓弧壁上向外突出有限位凸 塊，該第一轉動桿件的上端内壁上設有與該限位凸塊相對 應配合的弧形槽。 該第一轉動桿件的下端内壁上設有弧形凸台，該第二 轉動關節件的外端具有與該弧形凸台相對應配合的弧形空 位。 本發明中，該轉動機構還可以進行多檔位調節控制， 使椅背在相對椅座前後移動的方向上有數個檔位，以適合 不同體型的人們的不同需要，具體設計包含如下兩種方式 (當然，還可採用其他方式的設計以實現轉動機構的多檔 位調節控制，本發明中未全部列舉）：一、該轉動機構包含 限位調節構件，該限位調節構件包含限位調節卡扣、安裝 轉轴及壓力彈簧；該第一轉動關節件上具有安裝孔，該安 裝轉軸一端可轉動地安裝在該安裝孔内，該安裝轉轴的另 6 201208612 一端***該限位調節卡扣一端的圓孔内；該限位調節卡扣 的另一端設有弧形凸起部，該第一轉動桿件的上端内壁上 設有與該弧形凸起部相對應配合的波浪槽；該壓力彈簣的 一端與該限位調節卡扣具有弧形凸起部的一端連接，壓力 彈簧的另一端藉由固定軸與該第一轉動關節件連接；該限 位調節卡扣的安裝端，設有小凸塊，該第一轉動桿件的上 端内壁上設有用於該小凸塊活動的弧形槽，該弧形槽的終 端為該波浪槽的起始端；該限位調節構件整體絕大部分位 於第一轉動關節的空腔内。二、該轉動機構包含限位調節 構件，該限位調節構件包含弧形鎖定板、第二彈簧及調節 開關；該弧形鎖定板的内端穿過該第一安裝座而伸入至椅 背下端内部，並可在椅背下端内部中活動，該第二彈簣頂 住該弧形鎖定板的内端；該弧形鎖定板的外端設有至少一 個鎖定齒，該第一轉動關節件上具有該弧形鎖定板穿透的 弧形條孔，該第一轉動桿件的上端内壁上設有與該鎖定齒 相對應配合的波浪齒；該調節開關包含相互成交角的按鈕 部及調節桿，該調節桿藉由銷軸可轉動地安裝在椅背下端 内部，調節桿的端部藉由加強鐵芯與該弧形鎖定板的内端 連接。 在上述第二種設計方式中，該鎖定齒最佳設計成三個 且均句分佈。 該第一轉動關節件藉由第三螺桿與該第一安裝座做可 拆卸連接，該第一轉動桿件的上端具有用於該第三螺桿穿 透的通孔；該第一轉動關節件的内端設計成蝴蝶結型，該 201208612 第一安裝座内設計成與該第一轉動關節件的内端相對應配 合的形狀。 & 本發明的另一目的是提供一種用於椅子的轉動機構， 以使椅子椅背能夠相對椅座前後移動一種用於椅子的轉動 機構，本發明目的可以透過採用以下技術手段來實現. 設計、製作一種用於椅子的轉動機構，連接在椅子椅 背下端邊側與椅座後端邊侧之間’該轉動機構的下端能相 對椅座轉動調節，該轉動機構的上端能相對椅背轉動調 節，並且，在該轉動機構的轉動調節過程中，該椅背僅相 對椅座前後移動而椅背的豎直狀態始終保持不變。 與現有技術相比較’本發明椅背可前後移動的椅子的 技術功效在於：1·使用者能根據需要對椅子椅背進行前後 移動調節，與自己背部始終保持貼合而得到良好的舒適 感，並且，能適合不同體型的使用者；2.設置限位調節構 件，使椅背的前後移動實現多檔位化，因此能夠更好的適 應使用者不同坐姿的需要；3.第一轉動關節件藉由第三螺 桿與該第一安裝座係可拆卸連接，因此，若第三螺桿不安 裝的話，椅背可以向椅座折疊靠近，如此方便運輸。 【實施方式】 一種椅背可前後移動的椅子，如第丨圖所示，包含椅 座800及椅背600 ’該椅背600下端與椅座8〇〇相分離，椅 背600下端兩邊側與椅座800後端兩邊側之間分別藉由一 套轉動機構100 (或200)予以連接，該轉動機構1〇〇 (或 8 201208612 200)的下知旎相對椅座8〇〇轉動調節，該轉動機構ι〇〇(或 200)的上鈿此相對椅背6〇〇轉動調節，並且，在該轉動機 構100 (或200)的轉動調節過程中，該椅背6〇〇僅相對椅 座800前後移動而椅背6〇〇的豎直狀態始終保持不變。 實施例一： 本發明椅背可前後移動的椅子實施例一，結合第2至7 圖所示，連接在椅座800及椅背600之間的轉動機構1〇〇 包含第一轉動桿件1〇、第二轉動桿件20、第一轉動關節件 30、第二轉動關節件4〇及外蓋50，以及將第一轉動桿件 10的上端11及下端12蓋住的圓形端蓋6〇 ;該第一轉動桿 件10為中空型’大致上呈p亞鈴狀，上下兩端大而中間區段 小，上下兩端11、12呈圓筒型，中間區段呈條狀（配合參 見第11圖）；該第二轉動桿件20兩端分別具有圓孔21、22; 該第一轉動關節件30大致上呈圓柱狀’中間區段大而内外 兩段小（配合參見第9圖所示）；該第一轉動關節件30與 該椅背600下端邊侧的第一安裝座601連接固定，第一轉 動關節件30的内端31嵌入該第一安裝座601内；該第二 轉動關節件40也大致上呈圓柱狀，中間區段大而内外兩段 小（配合參見第10圖所示）’該第二轉動關節件40與該椅 座800後端邊側的第二安裝座801藉由螺釘802固定連接， 第二轉動關節件40的内端嵌入該第二安装座801内；該第 一轉動關節件30内沿徑向設有第一凹槽32,且沿軸向設有 第一軸孔33 ;該第二轉動桿件20的上端位於該第一凹槽 32内，並藉由第一軸桿23***該第一軸孔33及第二轉動 201208612 桿件20上端的圓孔21實現第二轉動桿件20與第一轉動關 節件10的可轉動連接；該第二轉動關節件40内沿徑向設 有第二凹槽42，且沿軸向設有第二軸孔43，該第二轉動桿 件20的下端位於該第二凹槽42内，並藉由第二轴桿24插 入該第二軸孔43及第二轉動桿件20下端的圓孔22實現第 二轉動桿件20與第二轉動關節件40的可轉動連接；該第 一轉動桿件10的上端11套住該第一轉動關節件30的外端 39，該第一轉動桿件10的下端12套住該第二轉動關節件 40的外端49 ;該第一轉動桿件10的上端具有第一中心圓 孔18，第一轉動桿件10的下端具有第二中心圓孔19 ;該 第一轉動關節件30上具有第一中心孔38,該第二轉動關節 件40上具有第二中心孔48;該轉動機構100還包含第一螺 桿70及第二螺桿71，該兩螺桿70、71均僅尾段具有外螺 紋，其餘桿段為光桿段；該第螺桿70依序穿過該第一中 心圓孔18及該第一中心孔38後再旋入該第一安裝座601 的螺孔内，該第二螺桿71依序穿過該第二中心圓孔19及 該第二中心孔48後再旋入該第二安裝座801的螺孔内，且 確保該第一轉動桿件10的上端11能相對第一螺桿70 (光 桿段）轉動、第一轉動桿件10的下端12能相對第二螺桿 71 (光桿段）轉動；在同一平面上，第一中心孔38及第一 軸孔33的連線與第二中心孔48及第二軸孔43的連線相平 行，第一中心孔38及第二中心孔48的連線與第一軸孔33 及第二軸孔43的連線相平行。 本發明椅背可前後移動的椅子藉由轉動機構100轉動 201208612 的過程實現’椅背600僅相對椅座800前後移動而椅背600 的豎直狀態始終保持不變。其操作原理如第8圖所示，根 據平行四邊形的原理’若平行四邊形的兩條平行邊繞相對 四角交點轉動時，另外兩條平行邊將會始終保持平行狀 態。對應第8圖所示’該第一轉動桿件1〇及第二轉動桿件 20相當於圖中的兩條平行邊ab及cd，第一轉動關節件30 上的第一中心孔38(或者第一轉動桿件1〇的上端的第一中 心圓孔18)及第一轴孔33相當於圖中a點及d點，第二轉 動關節件40上的第二中心孔48 (或者第一轉動桿件1〇的 下端的第二中心圓孔19)及第二轴孔43相當於圖中的b 點及c點’ a(i邊及be邊開始係為水平狀態，在讣及cd兩 邊的轉動過程中，該ad邊將相對be邊前後移動而始終保 持水平狀態。而對應到椅子中，椅子椅背6〇〇下端的第一 女裝座601與第一轉動關節件30連接固定，亦即椅背6〇〇 是豎直固定在該ad邊上（椅背的另一邊側還有一套轉動機 構）’椅座800的邊側第二安裝座801與第二轉動關節件40 連接固定’亦即可視椅座800相當於以邊，因此，在轉動 機構100轉動的過程中’椅背600能相對椅座8〇〇前後移 動而椅背600的豎直狀態始終保持不變。本發明巧妙的利 用平行四邊形原理’平行四邊形的四角a、b、c、d點為四 個旋轉中心，實現第一轉動桿件10及第二轉動桿件2〇兩 者的上端能與椅背600相對轉動，下端能與椅座8〇〇相對 轉動並行’透過第一轉動桿件10及第二轉動桿件2〇的轉 動運動，轉化成椅背600的前後平移運動。 11 201208612 為了使整個機構的結構 所示，該第-_7()^ 如第2圖及第7圖 桿 7!與第二中心 二套筒74.$第Β刀別设有第一套筒73及第 贫间/4,該第—套筒73 齒，且其鋸齒部分別嵌入 74的端部都設有鑛 内;裝有該第-4:—::孔38及第二中心孔48 及第二套筒74後，第一蟫;Ρ 70菸 第一螺桿71分別將第一套汽 ’、干 -韓動第二套筒74壓緊;該第 動才田件1干0的上端11能相對第一套筒73轉動、第一轉 旋“，因JH2能相對第二套筒74轉動。當轉動機構 節件内固：％筒73、74有鋸齒部並分別嵌入兩轉動關 疋，所以將不會因為旋轉的磨擦力而產生旋轉， 如此可避免機構長期運動，螺桿會因磨擦旋轉而鬆退，使 整個結構更牢靠安全。 因為各轉動桿件、轉動，件、螺桿等均為金屬材質， 直接接觸磨損大且動作過程中噪音大，因此，在其相互之 間均設有塑膠或其他非金屬材質的隔音件或墊圈等。具體 而言’如第2圖所示’該第—套筒73與第—中心圓孔18 ^間、該第二套筒74與第二中心圓孔19之間，均設有隔 曰墊圈75，該第一轉動桿件1〇的上端u與該第一轉動關 卽件30的外端39之間設有第一隔音件77，該第一隔音件 77上具有用於該第一螺桿7〇及第一軸桿23通過的通孔； 該第一轉動桿件10的下端12與該第二轉動關節件4〇的外 端49之間設有第二隔音件76，該第二隔音件76上具有用 於該第二螺桿71及第二軸桿24通過的通孔；該第二轉動 12 201208612 轉動關節件⑽之間、第二轉動桿件 A 了掏& 一轉動關節件4〇之間，均設有隔音片圈78。 脫，i其^機構活動時預緊力’使各配件運動時不會鬆 的平行二，件μ第二轉轉件20之間 動桿件⑼之間還設有第轉崎件1G及第二轉 :3=1:= = :: 捍件10的上她η 耵應地，忒第一轉動 的弧形槽15, ^内壁上設有與該限位凸塊35相對應配合 的阻浐作 ；弧形槽15的長度確定，受限位凸塊35 田 因此，第一轉動桿件10的旋轉運動被 —進行，確減品的可纽被限制在 内壁上設有弧形凸台16，兮第件10的下端12 與該弧形凸台1M目對應^二轉動關節件4G的外端具有 動桿件10❸旋轉運動：二二形空位46。如此使第-轉 的可靠性及準確性，尤^_3_歸，確保產品 =具有良好的㈣及切作用，卩=限位=’弧形凸台 轉動，使其只能換向轉動。 止第-轉動桿件10持續 為了使椅背_的前後 的適應使用者不同坐姿的*要，^夕棺位化而能夠更佳 椅子中，參照第2、3、9、二㈣發明椅背可前後移動的 =含限位調節構件，該限位調轉動機構刚 、安裝轉車由91及壓力彈簧％卜毒件包各限位調節卡扣 ^ ’ 5亥第—轉動關節件30上 13 201208612 具有安裝孔37,該安裝轉轴91 一端可轉動地安裝在該安裝 孔37内，該安裝轉軸91的另一端***該限位調節卡扣90 一端的圓孔901内；該限位調節卡扣90的另一端設有弧形 凸起部902,該第一轉動桿件10的上端11内壁上設有與該 弧形凸起部902相對應配合的波浪槽103 ;該壓力彈簧92 的一端與該限位調節卡扣90有弧形凸起部902的一端之小 圓柱903連接，壓力彈簀92的另一端藉由固定轴301與該 第一轉動關節件30連接；該限位調節卡扣90的安裝端， 設有小凸塊904,該第一轉動桿件10的上端11内壁上設有 用於使該小凸塊904可活動的弧形槽104，該弧形槽104 的終端為該波浪槽103的起始端；該限位調節構件整體絕 大部分位於第一轉動關節30的空腔内。 以下參照第13至18圖簡單說明該轉動機構100多檔 位限位調節原理及過程：以椅背600位處於最後端時為初 始狀態，此時，受壓力彈簧92的作用，該限位調節卡扣90 的弧形凸起部902位於該波浪槽103最上端的一個波谷 中，沿圖中箭頭方向旋轉轉動機構100 (即椅背600向前平 移），第一轉動桿件10上波浪槽103的波峰將限位調節卡 扣90的弧形凸起部902慢慢頂出，如第13至15圖所示， 該弧形凸起部902滑過波浪槽103的波峰處，在壓力彈簧 92作用下被壓進波浪槽103的下一波谷中，達成下一檔位 的調節及限位，後續檔位調節原理一樣，調節檔位的多少 根據波浪槽103的波浪設計個數而定。當需要向後平移椅 背600時，如第16至18圖所示，首先繼續向前轉動調節 14 201208612 J最後柘然後繼續使轉動機構100向前轉動（如第i 6 圖所不）直到該小凸塊9G4活動到弧形槽iG4的起始端即 為極限狀態（如第16圖所示），然:後持續地施力而轉動， 此時^形冑104的起始端部作用於該小凸塊904,迫使該 限位調即卡扣90轉動到另一個角度，同時，限位調節卡扣 9 〇在壓力彈簧9 2的作用下保持此狀態（如第17圖所示）， 1〇3^ 祕形，⑽落人罐槽_中力/向’=使 如第2及3圖所示，該第—轉動關節件：二圏運作螺 桿_第-安裝座削成可拆卸連接牛4= 件10的上端U具有用於該第三针第一轉動杯 如此’可在組裴時，預先不將該第、:干 的通孔111; λβ ^ π. 一螺祥34與圓形端蓋60 、、、裝’此夺’第一安裝座6〇1即可相對第__ 轉動’亦即椅背600可以相對轉動機構 胃=， 椅背600可以像第19至20圖所示 動因此 以縮小椅子的佔用空間而枝運輪。方如式向椅座折疊收攏， 轉動關節件3°的内端31設計成蝴^中S’二 ⑼1内設計成與該第一轉動關節件Μ Μ弟一t裝座 的形狀，如此限制椅背60G的轉動r:内端31相對應配合 動過度刚祕。 _’蝴背_轉 15 201208612 實施例二： 本發明椅背可前後移動的椅子實施例二’如第21至28 圖所示’本實施例二與實施例一結構及原理基本上相同， 不同之處在於轉動機構200在多檔位限位控制調節的咬 計，具體而言是： 該轉動機構200包含限位調節構件，該限位調節構件 包含弧形鎖定板51、第二彈簧52及調節開關53 ;該弧形 鎖定板51的内端穿過該第一安裝座6〇1而伸入椅背下 端内部，並可在椅背600下端内部活動，該第二彈簧52頂 住該弧形鎖定板51的内端；該弧形鎖定板51的外端設有 三個均勻分佈的鎖定齒5U，該第一轉動關節件3〇上$有 該弧形鎖定板Η穿越的孤形條孔3G2，該第__轉動桿件⑺ 的上端11内壁上设有與該鎖定齒511相對應配合的波浪齒 115 ;該調節開關53包含相互形成交角的按紐部531及調 節桿532,該調節桿532藉由銷軸6(^轉動地安裝在椅背 _下端内部（該銷軸可安袭或直接成型在椅背600下端内 =㈣調即桿532的端部藉由加強鐵芯533 (加強鐵芯533 ^而—桿-體成型）與該弧形鎖定板51的内端連接（具 =二，鎖定板51内端具有小孔，該加強鐵芯奶插 理二ί成連接^具體而言，多擋位限位控制調節的原 形鎖Ϊ板//9至31圖所示，在其中某—擋位時，該弧 此r位針廐第二彈簧52的作用下’使鎖定齒511嵌入 ==浪齒波谷内’需要調節時，按下調節開關 按一 531，該調節桿532旋轉，克服第二彈菁52的 201208612 彈力作用而驅使該弧形鎖定板51後退，直到該鎖定齒511 退出該波浪齒115外，即可轉動該轉動機構2〇〇，當調節到 位時，放鬆該按钮部531，該弧形鎖定板η在第二彈簧的 作用下，弧形鎖定板51的鎖定齒511重新嵌入到新檔位所 對應的波浪齒波谷内。 本實施例二在該第三螺桿34及圓形端蓋6〇預先不組 裝的情况下，同樣可以達成椅背6〇〇向椅座8⑼折疊靠近， 不^的是，須預先將該弧形鎖定板51全部壓縮進椅背下端 即可折疊至第2G圖所示的形狀’方便運輸至使用地 8、三轉動該椅背_，直到該弧形鎖定板51與該第一轉動 關節件30上的弧形條孔搬對準，該_鎖定板51即可 在第二彈簧的作用下自動彈出。 乂上内各係配合具體之優選技術手段對發明所作的進 =步詳w 兒明，不能認定本發明的具體實施只局限於這些 說月對於本發明所屬技術領域的通常知識者來說，在不 脫離本發日轉思的前提下，還可以做出若干簡單推導或替 換’都應當視為屬於本發明的保護範圍。 【圖式簡單說明】 第1圖係本發明椅背可前後移動的椅子之結構示意圖 J包令第1 · 1尽Ί a 主1_3圖’示意椅背相對椅座前後移動的過程。 第2圖係本發明椅背可前後移動的椅子實施例一之立 體分解示意圖。 第3圖係本發明椅背可前後移動的椅子實施例一之裝 17 201208612 配過程示意圖。 第4圖係本發明椅背可前後移動的椅子實施例一之後 視圖。 第5圖係第4圖中的A-A向剖視示意圖。 第6圖係第4圖中的B—B向剖視示意圖。 第7圖係第5圖中的C-C向剖視示意圖。 第8圖係本發明椅背可前後移動的椅子之轉動機構的 轉動過程原理示意圖。 第9圖係本發明椅背可前後移動的椅子實施例一之第 轉動關節件的立體結構示意圖，包含兩個不同方向的立 體圖第9-1及9-2圖。 第1〇圖係本發明椅背可前後移動的椅子實施例一之第 -轉動關節件的立體結構示意圖，包含兩個不同方向的立 體圖第10-1及1〇_2圖。 第Π圖係本發明椅背可前後移動的椅子實施例一之第 一轉動桿件的立體結構示意圖。 第12圖係本發明椅背可前後移動的椅子實施例一之限 位調節卡扣的立體結構示意圖，包含三個不同方向的立體 圖第12-1至12-3圖。 第13至18圖示意本發明椅背可前後移動的椅子實施 例一之轉動調節過程。 第19及20圖示意本發明椅背可前後移動的椅子實施 例一之椅背向椅座的收攏過程。 第21圖係本發明椅背可前後移動的椅子實施例二之立 201208612 體分解示意圖。 第2 2圖示意本發明椅背可前後移動的椅子實施例二之 限位調節構件與椅背之間的位置連接關係。 第23圖係本發明椅背可前後移動的椅子實施例二的結 構示意圖。 第24圖係第23圖中的D-D向剖視示意圖。 第25圖係本發明椅背可前後移動的椅子實施例二之第 一轉動桿件的立體結構示意圖。 第2 6圖係本發明椅背可前後移動的椅子實施例二之第 一轉動關節件的立體結構示意圖。 第27圖係本發明椅背可前後移動的椅子實施例二之弧 形鎖定板的立體結構示意圖。 第2 8圖係本發明椅背可前後移動的椅子實施例二之調 節開關的立體結構示意圖。 第29至31圖示意本發明椅背可前後移動的椅子實施 例二之轉動調節過程。 【主要元件符號說明】 10 第一轉動桿件 11 上端 12 下端 15 旅形槽 16 弧形凸台 18 第一中心圓孔 19 201208612 19 第二中心圓孔 20 第二轉動桿件 21 ' 22 圓孔 23 第一軸桿 24 第二轴桿 30 第一轉動關節件 31 内端 32 第一凹槽 33 第一軸孔 34 第三螺桿 35 限位凸塊 37 安裝孔 38 第一中心孔 39 外端 40 第二轉動關節件 42 第二凹槽 43 第二軸孔 46 弧形空位 48 第二中心孔 49 外端 50 外蓋 51 弧形鎖定板 52 第二彈簧 53 調節開關 20 201208612 60 圓形端蓋 70 第一螺桿 71 第二螺桿 73 第一套筒 74 第二套筒 75 隔音墊圈 76 第二隔音件 77 第一隔音件 78 隔音片圈 80 第一彈簧 90 限位調節卡扣 91 安裝轉轴 92 壓力彈簧 100 轉動機構 103 波浪槽 104 弧形槽 111 通孔 115 波浪齒 200 轉動機構 301 固定轴 302 弧形條孔 511 鎖定齒 531 按鈕部 532 調節桿 21 201208612 533 加強鐵芯 600 椅背 601 第一安裝座 605 銷轴 800 椅座 801 第二安裝座 802 螺釘 901 圓孔 902 弧形凸起部 903 小圓柱 904 小凸塊 22201208612 VI. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a chair, in particular, a chair that can be moved back and forth with respect to the back of the chair. [Prior Art] With the advancement of society, people's living standards have improved, people have worked The living environment and supplies have more and higher requirements. As for chairs, such as a chair or other seats, there is a growing variety of designs to meet people's diverse needs: adjustable lifting, waist pad adjustment, headrest adjustment 'backrest angle Branch. However, the various chairs of the prior art have their seat backs directly connected or integrated with the seat, or by means of a support, the bars are connected to the seat, such a chair can only be adjusted relative to the seat, even The seat is angle-adjusted to suit people sitting up and leaning back. At present, there is no chair for the back of the chair to move back and forth relative to the seat. * SUMMARY OF THE INVENTION The problem to be solved by the present invention is to avoid the disadvantages of the prior art and to propose a chair whose back can be moved back and forth. The user can adjust the back and forth of the chair back according to his own needs. Make the back of the chair always fit snugly on your back for good comfort. The solution of the present invention can be achieved by adopting the following technical means: designing and manufacturing a chair with a backrest that can be moved back and forth, including a seat and a 201208612 seat back, the lower end of the seat back is separated from the seat, and the lower side of the back of the seat and the chair The two sides of the rear end of the seat are respectively connected by a set of rotating mechanisms, the lower end of the rotating mechanism can be rotated and adjusted relative to the seat, the upper end of the rotating mechanism can be adjusted relative to the back of the seat, and the rotation adjustment of the rotating mechanism During the process, the seat back only moves back and forth relative to the seat and the vertical state of the seat back remains unchanged. As a specific embodiment of the present invention, the rotating mechanism includes a first rotating lever member, a second rotating lever member, and a first rotating member. a rotating joint member and a second rotating joint member; the first rotating rod member is hollow, substantially dumbbell-shaped, the upper and lower ends are large and cylindrical, and the middle portion is small and strip-shaped; the second rotation Each of the two ends of the rod has a circular hole; the first rotating joint member is substantially cylindrical, the middle portion is large and the inner and outer portions are small; the first rotating joint member and the lower end of the seat back The first mounting seat of the side is fixedly connected, and the inner end of the first rotating joint member is embedded in the first mounting seat; the second rotating joint member is also substantially cylindrical, the middle section is large, and the inner and outer sections are small, the first The second rotating joint member and the second mounting seat on the rear end side of the seat are fixedly connected by screws, and the inner end of the second rotating joint member is embedded in the second mounting seat; the first rotating joint member is radially arranged a first groove is disposed, and a first shaft hole is disposed in the axial direction; an upper end of the second rotating rod member is located in the first groove, and the first shaft hole is inserted into the first shaft hole and the second rotation a circular hole at an upper end of the rod realizes a rotatable connection between the second rotating rod and the first rotating joint; a second groove is radially disposed in the second rotating joint, and a second shaft hole is arranged in the axial direction The lower end of the second rotating rod member is located in the second recess, and the second rotating rod is inserted into the second shaft hole and the circular hole at the lower end of the second rotating rod member to realize the second rotating rod member and the second 201208612 Rotatable connection of the rotating joint member; the upper end of the first rotating rod member covers the first rotation An outer end of the joint member, the lower end of the first rotating rod member covers the outer end of the second rotating joint member; the upper end of the first rotating rod member has a first central circular hole, and the lower end of the first rotating rod member has a first end a second central circular hole; the first rotating joint member has a first central hole, and the second rotating joint member has a second central hole; the rotating mechanism further comprises a first screw and a second screw, both of which are only tail The segment has an external thread, and the remaining rod segments are polished rod segments; the first screw sequentially passes through the first central circular hole and the first central hole and then screwed into the screw hole in the first mounting seat, the second The screw sequentially passes through the second central circular hole and the second central hole, and then is screwed into the screw hole in the second mounting seat, and ensures that the upper end of the first rotating rod member can rotate relative to the first screw, a lower end of the rotating rod member is rotatable relative to the second screw; a line connecting the first central hole and the first shaft hole is parallel to a line connecting the second central hole and the second shaft hole, the first central hole and the second central hole The connection is parallel to the line connecting the first shaft hole and the second shaft hole. a first sleeve and a second sleeve are respectively disposed between the first screw and the first central circular hole, and between the second screw and the second central circular hole; the first sleeve and the second sleeve are respectively The end portions are provided with serrations, and the serrations thereof are respectively embedded in the first central hole and the second central hole; after the first sleeve and the second sleeve are mounted, the upper end of the first rotating rod member is opposite to the first end A sleeve rotates, and a lower end of the first rotating lever member is rotatable relative to the second sleeve. a sound insulating gasket is disposed between the first sleeve and the first central circular hole, and between the second sleeve and the second central circular hole; an upper end of the first rotating rod member and the first rotating joint member a first sound insulating member is disposed between the outer ends, and the first 201208612 sound insulating member is provided with a through hole for the first screw and the first shaft to pass; the lower end of the first rotating rod member and the second rotating joint member a second sound insulating member is disposed between the outer ends, and the second sound insulating member has a through hole for the second screw and the second shaft to pass through; the upper end of the second rotating rod member and the first rotating joint member An acoustical ring is disposed between the lower end of the second rotating member and the second rotating joint member. The rotating mechanism further includes an outer cover, and the upper end and the lower end of the first rotating lever member are further covered with a circular end cap. A first spring is further disposed between the first rotating lever member and the second rotating lever member. The outer end arc wall of the first rotating joint member protrudes outwardly from the limiting protrusion, and the inner wall of the upper end of the first rotating rod member is provided with an arcuate groove corresponding to the limiting protrusion. An arcuate boss is disposed on an inner wall of the lower end of the first rotating lever member, and an outer end of the second rotating joint member has an arcuate vacancy corresponding to the arcuate boss. In the invention, the rotating mechanism can also perform multi-gear adjustment control, so that the seat back has several gear positions in the direction of moving back and forth relative to the seat, so as to suit the different needs of different body types, the specific design includes the following two ways. (Of course, other modes of design may be adopted to implement the multi-gear adjustment control of the rotating mechanism, which are not all enumerated in the present invention): 1. The rotating mechanism includes a limit adjustment member, and the limit adjustment member includes a limit adjustment card. a first rotating joint member has a mounting hole, and one end of the mounting shaft is rotatably mounted in the mounting hole, and the other end of the mounting shaft is inserted into the limit adjusting buckle at the end of 201208612 The other end of the limit adjusting buckle is provided with an arc-shaped convex portion, and the inner wall of the upper end of the first rotating rod member is provided with a wave groove corresponding to the arc-shaped convex portion; One end of the pressure magazine is connected to one end of the limit adjusting buckle having a curved convex portion, and the other end of the pressure spring is connected to the first rotating joint by a fixed shaft; the limit The mounting end of the buckle is provided with a small bump, and the inner wall of the upper end of the first rotating rod is provided with an arc groove for the movement of the small bump, and the end of the arc groove is the starting end of the wave groove; The majority of the limit adjustment member is located in the cavity of the first rotating joint. The rotation mechanism includes a limit adjustment member, the limit adjustment member includes a curved locking plate, a second spring, and an adjustment switch; the inner end of the arc-shaped locking plate extends through the first mounting seat to the seat back The lower end is internal and movable in the inner portion of the lower end of the seat back, the second magazine is placed against the inner end of the curved locking plate; the outer end of the curved locking plate is provided with at least one locking tooth, the first rotating joint An arc-shaped strip hole penetrating the arc-shaped locking plate, the upper end inner wall of the first rotating rod member is provided with a wave tooth corresponding to the locking tooth; the adjusting switch comprises a button portion and an adjustment of the mutual trade angle a rod rotatably mounted inside the lower end of the seat back by a pin, the end of the adjusting rod being connected to the inner end of the curved locking plate by a reinforcing core. In the second design described above, the locking teeth are preferably designed in three and evenly distributed. The first rotating joint member is detachably connected to the first mounting seat by a third screw, and the upper end of the first rotating lever member has a through hole for the third screw to penetrate; the first rotating joint member The inner end is designed as a bow-tie type, and the 201208612 first mount is designed to have a shape corresponding to the inner end of the first rotary joint. Another object of the present invention is to provide a rotating mechanism for a chair, so that the chair back can be moved back and forth relative to the seat, and a rotating mechanism for the chair can be realized by the following technical means. a rotating mechanism for the chair is connected between the lower end side of the chair back and the rear side of the seat. The lower end of the rotating mechanism can be rotated relative to the seat, and the upper end of the rotating mechanism can rotate relative to the seat back. Adjusting, and during the rotation adjustment of the rotating mechanism, the seat back only moves back and forth relative to the seat and the vertical state of the seat back remains unchanged. Compared with the prior art, the technical effect of the chair that can move back and forth in the back of the present invention is as follows: 1. The user can adjust the back and forth of the chair back and forth as needed, and always fits with the back of the chair to obtain good comfort. Moreover, it can be adapted to users of different body types; 2. The limit adjustment member is arranged to realize the multi-position of the back and forth movement of the seat back, so that the user can better adapt to the needs of different sitting postures of the user; 3. The first rotating joint member The third screw is detachably connected to the first mounting base. Therefore, if the third screw is not installed, the seat back can be folded closer to the seat, so that transportation is convenient. [Embodiment] A chair with a backrest that can be moved back and forth, as shown in the figure, includes a seat 800 and a seat back 600'. The lower end of the seat back 600 is separated from the seat 8〇〇, and the lower side of the seat back 600 is opposite to the side. The two sides of the rear end of the seat 800 are respectively connected by a set of rotating mechanisms 100 (or 200), and the lower arm of the rotating mechanism 1〇〇 (or 8 201208612 200) is rotated and adjusted relative to the seat 8〇〇, The upper jaw of the rotating mechanism ι (or 200) is rotationally adjusted relative to the seat back 6 ,, and during the rotation adjustment of the rotating mechanism 100 (or 200), the seat back 6 〇〇 is only opposite the seat 800 The vertical state of the chair back 6 移动 is always unchanged. Embodiment 1 The chair of the present invention can be moved back and forth. Embodiment 1 of the present invention, as shown in FIGS. 2 to 7 , the rotating mechanism 1 连接 connected between the seat 800 and the seat back 600 includes the first rotating lever 1 The second rotating lever member 20, the first rotating joint member 30, the second rotating joint member 4A and the outer cover 50, and the circular end cap 6 covering the upper end 11 and the lower end 12 of the first rotating lever member 10 The first rotating member 10 is hollow and has a substantially p-bell shape. The upper and lower ends are large and the middle portion is small. The upper and lower ends 11 and 12 are cylindrical, and the middle portion is strip-shaped. See Fig. 11); the second rotating rod member 20 has circular holes 21, 22 at both ends; the first rotating joint member 30 is substantially cylindrical. The middle portion is large and the inner and outer portions are small (see the ninth part). The first rotating joint member 30 is fixedly connected to the first mounting seat 601 of the lower end side of the seat back 600, and the inner end 31 of the first rotating joint member 30 is embedded in the first mounting seat 601; The two rotating joint members 40 are also substantially cylindrical, the middle section is large and the inner and outer sections are small (as shown in Fig. 10) The second rotating joint 40 is fixedly connected to the second mounting seat 801 of the rear end side of the seat 800 by a screw 802. The inner end of the second rotating joint 40 is embedded in the second mounting base 801; the first rotating joint A first groove 32 is disposed in the radial direction of the member 30, and a first shaft hole 33 is disposed in the axial direction; an upper end of the second rotating rod member 20 is located in the first groove 32 and is supported by the first shaft The rod 23 is inserted into the first shaft hole 33 and the circular hole 21 at the upper end of the second rotation 201208612 rod 20 to realize the rotatable connection of the second rotating rod member 20 with the first rotating joint member 10; the inner edge of the second rotating joint member 40 A second groove 42 is disposed in the radial direction, and a second shaft hole 43 is disposed in the axial direction. The lower end of the second rotating rod member 20 is located in the second groove 42 and is inserted by the second shaft 24 The second shaft hole 43 and the circular hole 22 at the lower end of the second rotating rod member 20 realize the rotatable connection between the second rotating rod member 20 and the second rotating joint member 40; the upper end 11 of the first rotating rod member 10 covers the first portion Rotating the outer end 39 of the joint member 30, the lower end 12 of the first rotating rod member 10 covers the outer end 49 of the second rotating joint member 40; the first rotating member 10 The upper end has a first central circular hole 18, and the lower end of the first rotating lever member 10 has a second central circular hole 19; the first rotating joint member 30 has a first central hole 38, and the second rotating joint member 40 has a second central hole 48; the rotating mechanism 100 further includes a first screw 70 and a second screw 71, both of which have external threads only in the tail section, and the remaining rod segments are polished rod segments; the first screw 70 is sequentially worn After the first central circular hole 18 and the first central hole 38 are screwed into the screw hole of the first mounting base 601, the second screw 71 sequentially passes through the second central circular hole 19 and the second The center hole 48 is then screwed into the screw hole of the second mounting base 801, and the upper end 11 of the first rotating lever member 10 is ensured to rotate relative to the first screw 70 (light rod section), and the lower end of the first rotating lever member 10 is rotated. 12 is rotatable relative to the second screw 71 (light rod section); in the same plane, the line connecting the first center hole 38 and the first shaft hole 33 is parallel to the line connecting the second center hole 48 and the second shaft hole 43. The line connecting the first center hole 38 and the second center hole 48 is parallel to the line connecting the first shaft hole 33 and the second shaft hole 43. The chair of the present invention, which can be moved back and forth by the rotating mechanism 100, is rotated by the rotating mechanism 100. The process of the 201208612 realizes that the backrest 600 only moves back and forth relative to the seat 800 and the vertical state of the seat back 600 remains unchanged. The principle of operation is shown in Fig. 8, according to the principle of parallelograms. If two parallel sides of a parallelogram rotate around the intersection of four corners, the other two parallel sides will always remain parallel. Corresponding to Fig. 8, the first rotating lever member 1 and the second rotating lever member 20 correspond to two parallel sides ab and cd in the figure, and the first central hole 38 on the first rotating joint member 30 (or The first central circular hole 18) of the upper end of the first rotating lever member 1) and the first axial hole 33 correspond to points a and d in the figure, and the second central hole 48 on the second rotating joint member 40 (or the first The second central circular hole 19) and the second axial hole 43 of the lower end of the rotating rod member 1 are equivalent to the point b and the point c in the figure 'a (the i side and the be side start to be horizontal, on both sides of the 讣 and cd During the rotation, the ad side will move horizontally relative to the be side and remain horizontal. In the chair, the first dressing 601 corresponding to the lower end of the chair back 6 is connected and fixed to the first rotating joint 30. That is, the seat back 6〇〇 is vertically fixed on the ad side (there is also a set of rotating mechanism on the other side of the seat back). The side second mounting seat 801 of the seat 800 is connected and fixed to the second rotating joint 40. 'It is also possible to see that the seat 800 is equivalent to the side, so that during the rotation of the rotating mechanism 100, the seat back 600 can be moved back and forth relative to the seat 8 The vertical state of the seat back 600 is always kept constant. The present invention skillfully utilizes the principle of parallelograms. The four corners a, b, c, and d of the parallelogram are four rotation centers, and the first rotating member 10 and the first The upper end of the two rotating rods 2 能 can be rotated relative to the back 600, and the lower end can be rotated relative to the seat 8 并行 in parallel through the rotational movement of the first rotating rod 10 and the second rotating rod 2 , The front and rear translational movement of the back 600. 11 201208612 In order to make the structure of the whole mechanism, the first -_7 () ^ as shown in Figure 2 and Figure 7 and the second center two sleeves 74. $ Dijon The knife is provided with a first sleeve 73 and a first lean portion /4, the first sleeve 73 teeth, and the serrated portions thereof are respectively embedded in the end of the 74 is provided with a mine; the fourth -4:-:: After the hole 38 and the second center hole 48 and the second sleeve 74, the first screw 71 and the first screw 71 of the first 70 sets of the first set of steam, and the dry-Korean second sleeve 74 are respectively pressed; The upper end 11 of the field member 1 dry 0 can be rotated relative to the first sleeve 73, and the first rotation "because JH2 can rotate relative to the second sleeve 74. When the rotating mechanism member is solid: % cylinder 73, 7 4 There are serrations and are respectively embedded in the two rotations, so there will be no rotation due to the frictional force of the rotation, so as to avoid long-term movement of the mechanism, the screw will retreat due to the rotation of the friction, making the whole structure more secure and safe. Rotating rods, rotating parts, screws, etc. are all made of metal. The direct contact wear is large and the noise is large during the operation. Therefore, plastic or other non-metallic sound-insulating parts or washers are provided between them. For example, as shown in FIG. 2, between the first sleeve 73 and the first central circular hole 18, and between the second sleeve 74 and the second central circular hole 19, a spacer washer 75 is provided. A first sound insulating member 77 is disposed between the upper end u of the first rotating lever member 1 and the outer end 39 of the first rotating shutter member 30, and the first sound insulating member 77 has the first screw member 7 And a through hole through which the first shaft 23 passes; a second sound insulating member 76 is disposed between the lower end 12 of the first rotating rod member 10 and the outer end 49 of the second rotating joint member 4, the second sound insulating member 76 Having a through hole for the passage of the second screw 71 and the second shaft 24; the second rotation 12 201208612 between the rotating joint members (10), the second rotating rod member A, and a rotating joint member 4, are provided with a sound insulating coil 78. Take off, i pre-tightening force when the mechanism is active', so that the accessories will not loose when moving. Second, the second rotating member 20 between the moving rods (9) is also provided with the first to the first piece and the first part Two rotations: 3=1:==:: The upper part of the element 10 is η 耵, the first curved arc groove 15, the inner wall is provided with a resistance corresponding to the limit protrusion 35 The length of the arcuate groove 15 is determined, and the limited position of the bumps 35 is made. Therefore, the rotational movement of the first rotating lever member 10 is performed, and the negligible member of the reduction member is restrained from being provided on the inner wall with the arcuate boss 16 The lower end 12 of the first piece 10 corresponds to the curved boss 1M. The outer end of the second rotating joint member 4G has a rotational movement of the moving member 10: a two-shaped vacancy 46. In this way, the reliability and accuracy of the first-turn is especially reduced, ensuring that the product has a good (four) and cutting action, and the 卩=limit = 'arc-shaped boss rotates so that it can only rotate in the direction of rotation. The first-rotating lever member 10 continues to be used in order to adapt the front and rear of the seat back to the different sitting postures of the user, and to better position the chair, and to refer to the second, third, ninth, and second (four) inventions. It can be moved back and forth = with limit adjustment member, the limit adjustment rotation mechanism just, the installation of the transfer car by 91 and the pressure spring% poison kits each limit adjustment buckle ^ '5 Haidi - rotating joint parts 30 on 13 201208612 The mounting shaft 37 is rotatably mounted in the mounting hole 37, and the other end of the mounting shaft 91 is inserted into the circular hole 901 at one end of the limit adjusting buckle 90; the limit adjusting buckle The other end of the 90 is provided with a curved convex portion 902. The inner wall of the upper end 11 of the first rotating rod member 10 is provided with a wave groove 103 corresponding to the curved convex portion 902; one end of the pressure spring 92 is The limit adjustment buckle 90 has a small cylinder 903 connected to one end of the arcuate protrusion 902, and the other end of the pressure magazine 92 is connected to the first rotation joint member 30 by a fixed shaft 301; the limit adjustment buckle The mounting end of the 90 is provided with a small protrusion 904, and the inner wall of the upper end 11 of the first rotating rod 10 is provided An arcuate groove 104 for moving the small bump 904, the end of the arcuate groove 104 is the starting end of the wave groove 103; the limit adjusting member is entirely located in the cavity of the first rotating joint 30 Inside. Hereinafter, the principle and process of the multi-position limit adjustment of the rotating mechanism 100 will be briefly described with reference to the figures 13 to 18: the initial state is when the seat back 600 is at the last end, and at this time, the limit adjustment is performed by the action of the pressure spring 92. The arcuate protrusion 902 of the buckle 90 is located in a trough of the uppermost end of the wave groove 103, and rotates the rotating mechanism 100 in the direction of the arrow in the figure (ie, the seat back 600 is forwardly translated), and the first rotating bar member 10 has a wave groove 103 thereon. The crests of the limit adjustment buckle 90 are slowly ejected. As shown in FIGS. 13 to 15, the arcuate projection 902 slides over the crest of the wave groove 103 at the pressure spring 92. Under the action, it is pressed into the next trough of the wave groove 103 to achieve the adjustment and limit of the next gear position. The subsequent gear adjustment principle is the same, and the adjustment gear position is determined according to the wave design number of the wave groove 103. When it is necessary to translate the seat back 600 backwards, as shown in Figures 16 to 18, first continue to rotate the adjustment 14 201208612 J last 柘 then continue to rotate the rotating mechanism 100 forward (as in Figure i 6) until the small The movement of the bump 9G4 to the starting end of the arcuate groove iG4 is the limit state (as shown in Fig. 16), but then: the force is continuously applied and rotated, and the starting end of the ^-shaped dome 104 acts on the small convex Block 904, forcing the limit adjustment, that is, the buckle 90 is rotated to another angle, and at the same time, the limit adjustment buckle 9 保持 is maintained under the action of the pressure spring 9 2 (as shown in FIG. 17), 1〇3 ^ Secret shape, (10) Falling tank _Medium force / direction '= Make the first-rotating joint piece as shown in Figures 2 and 3: Two-turn operating screw _--mounting seat is cut into detachable connection cattle 4= The upper end U of the piece 10 has a first rotating cup for the third needle so that it can be used in the group, the first: dry through hole 111; λβ ^ π. a screw 34 and a circular end cap 60,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Shown in Figure 20 to reduce the space thus movable while branch transport wheel chair. The square end is folded and folded toward the seat, and the inner end 31 of the rotating joint member is designed to be in the shape of the S'two (9) 1 in the butterfly and the seat of the first rotating joint member. The rotation of the back 60G r: the inner end 31 corresponds to the excessive movement. _'Butterback_turn 15 201208612 Embodiment 2: The chair back of the present invention can be moved back and forth. Embodiment 2 is as shown in Figures 21 to 28 'The second embodiment is basically the same as the structure and principle of the first embodiment, different The rotation mechanism 200 controls the adjusted bite in the multi-gear limit, specifically: the rotation mechanism 200 includes a limit adjustment member, and the limit adjustment member includes a curved locking plate 51, a second spring 52, and An adjustment switch 53; an inner end of the arc-shaped locking plate 51 extends through the first mounting seat 6〇1 into the lower end of the seat back and is movable inside the lower end of the seat back 600, and the second spring 52 bears against the arc The inner end of the locking plate 51; the outer end of the arc-shaped locking plate 51 is provided with three evenly-distributed locking teeth 5U, and the first rotating joint member 3 has an orphan-shaped hole through which the arc-shaped locking plate traverses 3G2, the inner wall of the upper end 11 of the __rotating rod member (7) is provided with a wave tooth 115 corresponding to the locking tooth 511; the adjusting switch 53 comprises a button portion 531 and an adjusting rod 532 which form an angle of intersection with each other, the adjusting The rod 532 is rotatably mounted inside the seat back_lower end by the pin 6 (the pin It can be mounted or directly formed in the lower end of the seat back 600. (4) The end of the rod 532 is reinforced by the reinforcing core 533 (reinforced core 533 ^ - rod-body molding) and the inner end of the curved locking plate 51 Connection (with = two, the inner end of the locking plate 51 has a small hole, the reinforcing iron core is inserted into the connection ^ specifically, the multi-position limit control adjusts the original locking plate / / 9 to 31 It is shown that, in one of the gears, the arc is rotated by the r-position of the second spring 52 to 'make the locking tooth 511 into the == wave tooth valley'. When adjustment is required, press the adjustment switch to press a 531. The adjusting rod 532 rotates to overcome the 201208612 elastic force of the second elastic cyanine 52 to drive the curved locking plate 51 to retreat until the locking tooth 511 exits the wave tooth 115, and the rotating mechanism 2〇〇 can be rotated when the adjustment is in place. When the button portion 531 is loosened, the arcuate locking plate η is re-embedded into the wave tooth valley corresponding to the new gear position by the second spring. When the third screw 34 and the circular end cap 6 are not assembled in advance, the seat back 6 can also be achieved. The folding seat 8 (9) is folded close, but the curved locking plate 51 must be fully compressed into the lower end of the seat back to be folded into the shape shown in FIG. 2G for convenient transportation to the ground 8 and the third rotation. The back _ until the arcuate locking plate 51 is aligned with the arcuate strip hole on the first rotating joint member 30, the _locking plate 51 can be automatically ejected under the action of the second spring. It is to be understood that the specific embodiments of the present invention are limited to the specific embodiments of the present invention, and the present invention is not limited to the present invention. Under the premise of day-to-day thinking, it is also possible to make a number of simple derivations or substitutions, which should be considered as belonging to the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a chair that can be moved back and forth in the back of the present invention. J. Order 1 · 1 Ί a The main 1_3 diagram ′ illustrates the process of moving the back of the chair back and forth relative to the seat. Fig. 2 is a schematic exploded view of the first embodiment of the chair of the present invention which can be moved back and forth. Figure 3 is a chair of the present invention, which can be moved back and forth. Embodiment 1 of the present invention 17 201208612 Schematic diagram of the process. Fig. 4 is a rear view of the first embodiment of the chair of the present invention in which the back of the chair can be moved back and forth. Fig. 5 is a cross-sectional view taken along the line A-A in Fig. 4. Fig. 6 is a cross-sectional view taken along line B-B of Fig. 4. Fig. 7 is a schematic cross-sectional view taken along line C-C of Fig. 5. Fig. 8 is a schematic view showing the principle of the rotation of the rotating mechanism of the chair which can be moved back and forth in the chair back of the present invention. Fig. 9 is a perspective view showing the three-dimensional structure of the first rotating joint member of the first embodiment of the chair which can be moved back and forth according to the present invention, and includes two different directions of the figures 9-1 and 9-2. Fig. 1 is a perspective view showing the first embodiment of the first embodiment of the chair of the present invention, which can be moved back and forth, and the perspective view of the rotary joint member, including the figures 10-1 and 1〇_2 of the two different directions. The first drawing is a schematic view showing the three-dimensional structure of the first rotating member of the first embodiment of the chair which can be moved back and forth. Fig. 12 is a perspective view showing the three-dimensional structure of the limit adjusting buckle of the chair of the present invention, which can be moved back and forth, and includes three different directions of the stereoscopic drawings 12-1 to 12-3. Figs. 13 to 18 are diagrams showing the rotation adjustment process of the first embodiment of the chair in which the back of the chair can be moved back and forth. 19 and 20 are diagrams showing the folding process of the chair back to the seat of the chair of the first embodiment of the present invention. Figure 21 is a perspective view of the second embodiment of the chair of the present invention. Fig. 2 is a view showing the positional connection relationship between the position regulating member and the seat back of the second embodiment of the chair which can be moved back and forth in the chair back of the present invention. Figure 23 is a schematic view showing the structure of the second embodiment of the chair of the present invention which can be moved back and forth. Fig. 24 is a schematic cross-sectional view taken along line D-D of Fig. 23. Figure 25 is a perspective view showing the first rotating member of the second embodiment of the chair of the present invention. Fig. 26 is a perspective view showing the structure of the first rotating joint member of the second embodiment of the chair of the present invention which can be moved back and forth. Figure 27 is a perspective view showing the three-dimensional structure of the arc-shaped locking plate of the second embodiment of the chair of the present invention. Figure 28 is a perspective view showing the three-dimensional structure of the adjusting switch of the second embodiment of the chair of the present invention. Figures 29 to 31 are diagrams showing the rotation adjustment process of the second embodiment of the chair in which the back of the chair can be moved back and forth. [Main component symbol description] 10 First rotating lever member 11 Upper end 12 Lower end 15 Traveling groove 16 Curved boss 18 First center circular hole 19 201208612 19 Second center circular hole 20 Second rotating lever member 21 ' 22 Round hole 23 First shaft 24 Second shaft 30 First rotating joint member 31 Inner end 32 First groove 33 First shaft hole 34 Third screw 35 Limiting projection 37 Mounting hole 38 First center hole 39 Outer end 40 Second rotating joint member 42 Second groove 43 Second shaft hole 46 Curved vacancy 48 Second center hole 49 Outer end 50 Cover 51 Curved locking plate 52 Second spring 53 Adjustment switch 20 201208612 60 Round end cover 70 First screw 71 Second screw 73 First sleeve 74 Second sleeve 75 Sound insulation washer 76 Second sound insulation 77 First sound insulation 78 Sound insulation ring 80 First spring 90 Limit adjustment buckle 91 Mounting shaft 92 Pressure Spring 100 Rotating mechanism 103 Wave groove 104 Curved groove 111 Through hole 115 Wave tooth 200 Rotating mechanism 301 Fixed shaft 302 Curved strip hole 511 Locking tooth 531 Button portion 532 Adjustment lever 21 201208612 533 600 core 601 first mounting seat backrest 605 of the seat 801 of the second pin 800 screw mount 802 901 902 circular arc-shaped protrusion portion 903 small cylinder 904 of small bumps 22