M417850 五、新型說明： 【新型所屬之技術領域】 本創作係關於一種椅子，尤指一種可依據乘坐者大腿長度 調整座墊長度，用以提供大腿較佳支撐性的椅子。 【先前技術】 一般椅子的結構是在一支架上設置一座墊與一椅背，用該 包含椅腳的支架支撐座墊與椅背，有部分的椅子更附設有扶 手，用來支撐乘坐者的手臂，且因為椅子的乘坐者的身材有很 大的差異’因此椅子為了能夠提供不同身材的乘坐者較舒適的 乘坐感受’因此椅子被設計成椅被或扶手可以被調整，乘坐者 可以依據自身的需求調整椅背或扶手以達到最舒適的乘坐效 果。 一般椅子的座墊雖然被設計成可以調整相對於地面的高 度，然而這樣的調整仍然是不夠的，因為調整座墊高度只能用 來適應乘坐者小腿長度，但乘坐者依據身高或身材比例不同， 乘坐者的大腿長度有不同，一般椅子的座墊大多以中等身材的 人設計，當乘坐者的身材過於高大或矮小時，一般的座墊就無 法順利的支撐乘坐者的大腿，導致乘坐者有不舒適感。 【新型内容】 為解決此問題，本創作提供一種可調整座墊長度的座椅， 該座椅包括-_ ’具有二支紐，二支各自具有一内側 面，一套接管，固設於椅架上，套接管包括隔開的一前端與一 3 y ?孔由套接讀相端面延伸至後端端面，套接管係 固設於任易-切段的内側面，—本體，固設於椅架上包括 隔歼1的帛两與一第二面，本體進一步包括連接在第一及第 面之間的-頂面，本體也包括與頂面隔開的二凹槽，二凹槽 相互隔開’二凹槽各從由第—面延伸至第二面，椅架之二支^ 齡自卡固於凹_，且套接管也卡断其中—凹槽内，一滑 t可滑動地套設於套鮮中，滑桿包括_的—第一端與一 第二端，且滑桿的第—端位於套接管的前端端面之外，第二端 位於套接S的後端端面之外…延伸件，隨於滑桿的第一端 上’延伸件係與滑桿—起沿套接管位移，使延伸件可靠近或遠 離本體的第二面。 藉由上述的結構特徵，使得座椅的延伸件可滑動’進一步 座椅的座墊能夠調整延伸件以符合乘坐者的大腿長度，而能提 供大腿較佳的支雜，進—步提供較舒適_坐絲，且延伸 件利用二滑桿將所承受的壓力分散在四端塞上，使延伸件具有籲 足夠的結構強度而較不易損壞。 【實施方式】 以下所有圖式係僅便於解釋本創作基本教導而已，圖式中 將對構成較佳實施例之元件的數目、位置、關係、及尺寸之延 伸將有所說明’在閱讀及了解本創作的敎導後相關之變化實施 屬於業界技能。另外，在閱讀及了解本創作的敎導後，配合特 疋力畺、重量、強度、及類似要求之精確尺寸及尺寸比例之改 變亦屬業界技能。 在不同圖式中係以相同標號來標示相同或類似元件；另外 6月了解文中諸如“第一”、“第二”、“第三，，、“上”、 下”、“前”、“後”、“内，，、“外，，、“端，，、“部”、 段、“水平”、“垂直”、“向内”、“向外”、“寛度”、 長度”、”區，，、”周圍，，、”側，，、，，逕向，，、”軸向，，等 等及類似用語係僅便於看圖者參考圖中構造以及僅用於幫助 描述本創作而已。 依據圖式所示，本創作的座椅包括由截面為橢圓形的二金 屬管’彎折構成的-_ 2 Q，椅架2 Q具有概成水平狀的且隔 開的二第一支撐段2 2，椅架2 〇進一步包括個自由第一支撐 奴2 2—端概略垂直延伸的二第二支撐段2 4，二匕形的椅腳 2 6各連接於二第—支樓段2 2的另一端，此外二第一支撐段 2 2各自包括相對的一内側面2 8，複數銜接桿2 9以諸如焊 接的手段固設在二第—支#段2 2與二椅腳2 6之間，二椅腳 2 6的水平區段係接觸於地面而支擇椅架2 〇穩固地放置。依 據圖式所心本創作椅進—步包括固設於触2〇上的一 椅背3 1，椅背3 1對應椅架2 〇的二第二支槪2 4設有二 結合部3 3，使椅架2 〇的二第二支撐段2 4各自套固於結合 部3 3 (摩擦結合）中定位（如第-圖所示）。 依據圖式所示，座椅也包括截面為正方形的二套接管3 〇 ’二套接管3◦各自包括隔開的一前端3 2與一後端3 4， M417850 二套接管3 0進一步各自包括由前端3 2端面延伸至後端3 4端面的一穿孔3 6。二套接管3 0各自以諸如焊接方式固設 於分別固設於二第一支撐段2 2各自的内側面2 8上。 依據圖式所示，座椅另包括套設於套接管3 〇的四端塞3 8，每一^&塞3 8各自具有一凸緣4 0，以及由各自從凸緣4 0延伸具正方形戴面的一塞體4 2，四端塞3 8進一步各自包 括貫穿凸緣4 〇與塞體4 2的一滑孔4 4，滑孔4 4各自位於 凸緣4 0之區段的截面為圓孔形。其中二端塞3 8分別套設於 二套接管3 0各自的前端3 2 (如第五圖所示），該二端塞3 8各自的塞體42各自穿入套接管3 〇的穿孔3 6中，另外二 端塞3 8分別套設於二套接管3〇各自的後端34(如第五圖 所不）’且該二端塞3 8各自的塞體4 2各自穿入套接管3 〇 的穿孔3 6中。 依據圖式所示’雜又包括©設於椅架2 0上的-座墊5 6，座墊5 6具有一本體5 8以及可滑動的一延伸件7 6，其 中本體5 8具有曲面狀的且絲承載乘坐者之臀部的一頂面 ㈤，以及與頂面6 0隔開的一底面61 ’本體5 8也包括垂 直第-及第二面62、64且隔開的二側邊66，二凹槽72 各自形成於側邊6 6與底面6 1之間，複數結合柱7 自形 成於底面6 1且位於凹槽7 2中，本體5 8另包括由頂面⑽ (伸至底面6 1的複數長形的透氣槽6 8，複數透氣槽6 8相 互隔開且位於第-及第二面6 2、6 4之間。本體5 8係固設 6 M417850 於椅架2 0的二第一支撐段2 2上，使椅架2 0的二第一支撐 段22及二套接管3 0各自嵌入本體58的凹槽72中（如第 六圖所示），且本體5 8的複數結合柱7 〇各自穿入椅架2 〇 各自的二第一支樓段2 2 +(如第五圖所*)’而能進一步以 複數螺絲各自從二第-支樓段2 2的底面各自鎖入本體5 8 的結合柱7 〇内。 依據圖式所示，座椅更包括各自滑動地套設於二端塞3 8 中的二滑桿4 6，二滑桿4 6各自包括隔開的—第—端4 8與 一第二端5 0。二滑桿4 6各自可滑動地套設於位於同一套接 管3 0之二端塞3 8各自的滑孔4 4中，且二滑桿4 6的各自 的第-端48穿出固設在二套接管3〇各自之前端32的端 塞3 8外’二滑桿4 6各自的第二端5 〇穿出固設在二套接管 3 0各自之後端3 4的端塞3 8外，二滑桿4 6各自的第二端 5 0端面具有-料5 4，二鎖固元件5 2各自穿過塾片5 4 鎖入二滑桿4 6各自的第二端5 〇内，由於塾片5 4的外徑各 自大於位於套接管3 0之後端3 4之二端塞3 8的滑孔4 4 内徑，使得二滑桿4 6各自無法沿套接管3 0之軸向朝前端3 2脫離二端塞3 8。 依據圖式所示，座塾5 6的延伸件7 6包括成L形的-頂 壁7 8與-前壁8 〇，延伸件7 6進—步包括連接於頂壁7 8 -端且與别壁8 0隔開的—抵接面8 2，二支腳8 8由前壁8 〇的内表面延伸穿出於抵接面82外側，延伸件76也包括由 7 M417850 抵接面8 2延伸的一凸部8 4 ,延伸件7 6另包括各自形成於 支腳8 8與前壁8 0之間的二支撐壁8 6。二滑桿4 6各自的 第一端4 8抵靠於延伸件7 6的前壁8 〇之内表面，且二滑桿 4 6各自的第一端4 8也抵靠在支撐壁8 6下方（如第五圖瑣 事）’二鎖接元件9 0各自穿過延伸件γ 6的前壁8 0鎖入滑 桿46的第一端48内，將延伸件7 6鎖固而能同時與二滑桿 4 6 —起在内縮位置（如第二、五圖所示）與伸出位置（如第 七、八圖所示）之間位移，且能被四端塞3 8各自摩擦定位於 内縮位置與伸出位置之間的任意一位置。 為了方便說明，係假設座椅的延伸件7 6位於内縮位置， 此時延伸件7 6的凸部8 4嵌入本體5 8的凹部7 4内（如第 二圖所示），且延伸件7 6的抵接面8 2貼靠於本體5 8的第 二面64 (如第五圖所示），二滑桿46各自的第一端48延 伸出固設在套接管3 G之前端3 2的二端塞3 8的長度小於 第二端5 0延伸固設在套接管3 〇之後端3 4的二端塞3 8 的長度，在這樣的狀態下座墊5 6的長度是最短的狀態，因此 較適合身材矮小或大腿長度短的人乘坐。此外延伸件7 6能朝 遠離第二面6 4的方向位移，當延伸件7 6位於伸出位置（如 第七、八圖所示）時，二墊片5 4各自貼靠於固設在套接管3 0之後端3 4之端塞3 8的凸緣4 0外側表面（如第八圖所 不）’此時二滑桿4 6各自的第一端4 8穿出固設在套接管3 〇之前端3 2之的二端塞3 8的長度大於第二端5 〇穿出固 8 M417850 設在套接管3 〇固設在後端3 4的端塞3 8外，如此本創作座 墊5 6處於最長的狀態，較適合身材高大或大腿較長的人乘 坐。延伸件7 6除了可以定位在内縮位置或伸出位置之間的任 意一位置’詳細地說，二滑桿4 6各自套設在二端塞3 8的滑 孔4 4内’因此端塞3 8之滑孔4 4的内表面對二滑桿4 6的 外表面具有摩擦阻力’利用該摩擦阻力就能夠定位延伸件7 6 在伸出或内縮位置之間的任意一位置上。 本創作座椅延伸件7 6可滑動的設計，使得座椅的座墊5 6能夠調整延伸件7 6以符合乘坐者的大腿長度，而能提供大 腿較佳的支撐性，進一步提供較舒適的乘坐效果，且延伸件7 6利用二滑桿4 6將所承受的壓力分散在四端塞3 8上，使延 伸件7 6具有足夠的結構強度而較不易損壞。 本創作的基本教導已加以說明，對具有本領域通常技能的 人而言，許多延伸和變化將是顯而易知者。舉例言之，座椅的 椅背3 1及二第二支撐段2 4可以移除’如此座椅的座墊5 6 仍然提供使用者乘坐的空間，且也不會影響座墊5 6調整長度 的功此。延伸件7 6的二支腳8 8可以移除，延伸件7 6在缺 少二支腳8 8的狀態下，仍财以在内縮位置與伸出位置之間 位移。或延伸件7 6的二支樓壁8 6可以被移除，缺少二支撐 壁8 6時，延伸件7 6與二滑桿4 6各自的結合強度將略為降 低但仍足以支撲乘坐者大腿的重量。或椅架可以是本創 作圖式揭露以相形式，例如贿2 Q的触可以是由二第一 9 M417850 支撐段2 2垂直延伸的導T形的外形所構成。 由於說明書揭示的本創作可在未脫離本創作精神或大體 特徵的其它特定形式來實施’且這些特定形式的一些形式已經 被指出’所以’說明書揭示的實施例應視為舉例說明而非限 制。本創作的範圍是由所附的申請專利範圍界定，而不是由上 述說明所界定’對於落入申請專利範圍的均等意義與範圍的所 有改變仍將包含在其範圍之内。 【圖式簡單說明】 第一圖為本創作座椅的立體分解外觀圖。 第一圖為本創作座椅的組合立體外觀圖。 第三圖為第二圖的仰式圖。 第四圖為沿第三圖4-4線所取的剖視圖。 第五圖為沿第三圖5-5線所取的剖視圖。 第六圖為第二圖之後側局部放大視圖。 第七圖為在第二圖狀態下延伸件由内縮位置位移至伸出位置 的立體外觀圖。 第八圖為在第五圖狀態下延伸件由内縮位置位移至伸出位置 的剖視圖。 【主要元件符號說明】 2 0椅架 2 2第一支撐段 2 4第二支撐段 2 6椅腳 2 8内側面 2 9銜接桿 3 〇套接管 3 1椅背 3 2前端 3 3結合部 3 4後端 3 6穿孔 3 8端塞 4 0凸緣 4 2塞體 4 4滑孔 4 6滑桿 4 8第一端 5 0第二端 5 2鎖固元件 11 M417850 5 4墊片 5 8本體 6 1底面 6 4第二面 6 8透氣槽 7 2凹槽 7 6延伸件 8 0前壁 8 4凸部 8 8支腳 5 6座塾 6 0頂面 6 2第一面 6 6側邊 7 0結合柱 7 4凹部 7 8頂壁 8 2抵接面 8 6支撐壁 9 0鎖接元件 12M417850 V. New description: [New technical field] This creation is about a chair, especially a chair that can adjust the length of the seat according to the length of the occupant's thigh to provide better support for the thigh. [Prior Art] The structure of a general chair is to provide a pad and a seat back on a bracket, and the seat and the back are supported by the bracket including the foot, and some of the chairs are provided with armrests for supporting the occupant. The arm, and because the chair occupant's body is very different'' therefore the chair is more comfortable to ride in order to provide a different body occupant' so the chair is designed as a chair or armrest can be adjusted, the occupant can rely on Adjust your back or armrests for your own comfort. Although the seat cushion of a typical chair is designed to adjust the height relative to the ground, such adjustment is still not enough, because the height of the adjustment cushion can only be used to adapt to the length of the occupant's calf, but the occupant is different according to height or body proportion. The occupant's thigh length is different. Generally, the seat cushion of the chair is mostly designed by a medium-sized person. When the occupant's body is too tall or short, the general seat cushion cannot support the occupant's thigh smoothly, resulting in the occupant. There is discomfort. [New content] In order to solve this problem, the present invention provides a seat that can adjust the length of the seat cushion, the seat includes - _ 'with two links, two each has an inner side, a set of tubes, fixed to the chair The ferrule includes a spaced apart front end and a 3 y hole extending from the socket read phase end face to the rear end end face, and the ferrule pipe system is fixed on the inner side of the any easy-cut section, the body is fixed on the body The chair frame includes two sides and a second side of the partition 1 , the body further includes a top surface connected between the first surface and the first surface, the body also includes two grooves spaced apart from the top surface, and the two grooves are mutually The two grooves are separated from the first surface to the second surface, and the two legs of the seat frame are self-retained in the concave _, and the ferrule is also broken therein - in the groove, a sliding t slidably The sleeve is disposed in the sleeve, and the sliding rod includes a first end and a second end, and the first end of the sliding rod is located outside the front end surface of the socket tube, and the second end is located at the rear end surface of the sleeve S. The extension member, along with the extension member on the first end of the slider, is displaced along the sleeve tube so that the extension member can be moved closer to or away from the sleeve A second side thereof. With the above structural features, the extension of the seat can be slidable. Further, the seat cushion of the seat can adjust the extension to conform to the length of the occupant's thigh, and can provide better support of the thigh, and provide more comfortable steps. _The wire is seated, and the extension member uses the two sliding rods to spread the pressure on the four-end plug, so that the extension member has sufficient structural strength and is less susceptible to damage. [Embodiment] All of the following drawings are merely illustrative of the basic teachings of the present invention, and the extension of the number, position, relationship, and size of the components constituting the preferred embodiment will be explained. The relevant changes in the implementation of this creation are industry skills. In addition, after reading and understanding the design of this creation, the changes in the exact size and size ratio of the special force, weight, strength, and similar requirements are also industry skills. In the different figures, the same reference numerals are used to designate the same or similar elements; in addition, in June, such as "first", "second", "third,", "upper", "down", "front", " After, "inside,", "outside,", "end,", "part", paragraph, "horizontal", "vertical", "inward", "outward", "twist", length", "Zone,,," around,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Only. According to the drawing, the seat of the present invention comprises -_ 2 Q which is formed by bending a two-metal pipe having an elliptical cross section, and the frame 2 Q has two horizontally spaced and spaced apart first support segments. 2 2, the chair frame 2 〇 further includes a free first support slave 2 2 - a second vertical support section 2 2, a second vertical support section 2 4, two legs of the legs 2 6 are connected to the second section - branch section 2 2 The other end, in addition, the two first support segments 2 2 each include an opposite inner side surface 2, and the plurality of connecting rods 2 9 are fixed to the second and second legs of the second and second legs The horizontal section of the two legs 2 6 is in contact with the ground and the seat frame 2 is placed firmly. According to the drawing, the creative chair further includes a seat back 3, which is fixed on the contact 2, a seat back 3 1 corresponding to the seat frame 2, and a second support 2 2 is provided with two joints 3 3 The two second support sections 24 of the seat frame 2 are each positioned in the joint portion 3 3 (friction joint) (as shown in the first figure). According to the drawings, the seat also includes two sets of joints 3 〇 'two sets of joints 3 截面 each including a front end 3 2 and a rear end 3 4 , the M417850 two sets of joints 30 further each include A perforation 36 extends from the end face of the front end 32 to the end face of the rear end 34. The two sets of nozzles 30 are each fixed to the inner side surface 28 of each of the two first support sections 2 2, respectively, such as by welding. According to the drawings, the seat further includes a four-end plug 3 8 which is sleeved on the socket 3 , and each of the plugs 8 8 has a flange 40 , and each extends from the flange 40 . A plug body 4 2 of the square wearing surface, the four end plugs 38 further each include a sliding hole 44 through the flange 4 〇 and the plug body 4 2 , and the sliding holes 4 4 are respectively located in the section of the flange 40 It is a round hole shape. The two end plugs 38 are respectively sleeved on the front ends 3 2 of the two sets of nozzles 30 (as shown in the fifth figure), and the plug bodies 42 of the two end plugs 38 respectively penetrate the through holes 3 of the sleeve tube 3 In the sixth, the other two end plugs 8 8 are respectively sleeved on the respective rear ends 34 of the two sets of the connecting tubes 3 (as shown in the fifth figure), and the respective plug bodies 4 2 of the two end plugs 38 are respectively inserted into the sleeve tubes. 3 〇 perforated 3 6 in. According to the drawing, the utility model also includes a seat cushion 5 6 disposed on the seat frame 20, and the seat cushion 56 has a body 58 and a slidable extension member 7 6. The body 58 has a curved shape. a top surface (five) carrying the occupant's buttocks, and a bottom surface 61' body 58 spaced from the top surface 60. The body also includes vertical first and second faces 62, 64 and spaced apart from each other. The two grooves 72 are respectively formed between the side edge 6 6 and the bottom surface 61. The plurality of bonding columns 7 are formed on the bottom surface 61 and located in the groove 7 2, and the body 58 further includes a top surface (10) (to the bottom surface). 6 1 of the plurality of elongated venting grooves 6 8 , the plurality of venting grooves 6 8 are spaced apart from each other and located between the first and second faces 6 2, 6 4 . The body 5 8 is fixed with 6 M417850 for the chair frame 20 The two first supporting segments 22 and the two sockets 30 of the frame frame 20 are respectively embedded in the recesses 72 of the body 58 (as shown in the sixth figure), and the body 58 The plurality of combined columns 7 穿 each penetrate the second frame section 2 2 + of the second frame section of the frame frame 2 (as shown in Fig. 5), and can further each of the plurality of screws from the bottom surface of the second section - branch section 2 2 The knots that each lock into the body 5 8 According to the figure, the seat further includes two sliding rods 4 6 which are respectively slidably sleeved in the two end plugs 3 8 , and the two sliding rods 4 6 each include a spaced apart - first end 4 8 and a second end 50. The two sliding rods 4 6 are each slidably sleeved in the respective sliding holes 4 4 of the two end plugs 38 of the same sleeve pipe 3, and the respective two sliding rods 46 The first end 48 extends out of the end plugs 38 fixed to the respective front ends 32 of the two sets of joints 3, and the second ends 5 of the two sliding rods 4 6 are pierced and fixed at the respective ends of the two sets of joints 30 3 4 end plugs 3 8 , the second sliding ends 4 6 of the second end 50 end faces have a material 5 4 , the two locking elements 5 2 each through the crotch panel 5 4 locked into the two sliding rods 46 In the second end 5 〇, since the outer diameters of the cymbals 514 are respectively larger than the inner diameters of the sliding holes 44 of the two end plugs 38 of the rear end 3 4 of the ferrule 3 0, the two sliding rods 46 cannot each follow the sleeve. The axial direction of the nozzle 30 is separated from the front end 3 2 from the two end plugs 38. According to the drawing, the extensions 76 of the seat 塾6 6 comprise an L-shaped top wall 7 8 and a front wall 8 〇 extending The step 76 includes a connection to the top wall 7 8 - end and is separated from the other wall 80 8 2, the two legs 8 8 extend from the inner surface of the front wall 8 穿 through the outer side of the abutting surface 82, and the extension member 76 also includes a convex portion 8 4 extending from the 7 M417850 abutment surface 8 2 , the extension member 7 6 further comprising two support walls 8.6 formed between the legs 8 8 and the front wall 80. The first ends 4 8 of the two slide bars 46 are abutted against the front wall 8 of the extensions 76. The surface, and the first end 4 8 of each of the two sliders 4 6 also abuts against the support wall 86 (as shown in the fifth figure). The two locking elements 90 each pass through the front wall 80 of the extension γ 6 . Locking into the first end 48 of the slide bar 46, the extension member 76 is locked to simultaneously engage the two slide bars 46 in the retracted position (as shown in the second and fifth figures) and the extended position (eg, The displacement between the seventh and eighth figures is and can be frictionally positioned by the four end plugs 38 at any position between the retracted position and the extended position. For convenience of explanation, it is assumed that the extension member 76 of the seat is in the retracted position, at which time the convex portion 84 of the extension member 76 is embedded in the recess portion 74 of the body 58 (as shown in the second figure), and the extension member The abutting surface 8 2 of the 7 6 abuts against the second surface 64 of the body 58 (as shown in the fifth figure), and the first ends 48 of the two sliding rods 46 extend and are fixed to the front end 3 of the sleeve 3 G The length of the two end plugs 3 8 of 2 is smaller than the length of the two end plugs 38 of the second end 50 extending at the end 3 4 of the ferrule 3 ,, in which the length of the seat cushion 56 is the shortest. State, so it is more suitable for people with short stature or short thigh length. In addition, the extension member 76 can be displaced away from the second surface 64. When the extension member 76 is in the extended position (as shown in the seventh and eighth figures), the two spacers 5 4 are respectively fixed to the fixed surface. The outer surface of the flange 40 of the end plug 3 8 of the rear end 3 4 of the ferrule 3 0 (as shown in the eighth figure) 'At this time, the first end 4 8 of each of the two sliding rods 46 is fixedly disposed on the ferrule 3 〇 The end of the front end 3 2 of the two end plugs 3 8 is longer than the second end 5 〇 出 固 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 Pad 5 6 is in the longest state and is more suitable for people who are tall or have long legs. The extension member 76 can be positioned at any position between the retracted position or the extended position. In detail, the two sliders 4 6 are respectively sleeved in the sliding holes 44 of the two end plugs 38. The inner surface of the slider 4 4 has a frictional resistance against the outer surface of the two sliders 46. With this frictional resistance, it is possible to position the extension member 76 at any position between the extended or retracted positions. The slidable design of the present seat extension member 76 enables the seat cushion 56 of the seat to adjust the extension member 76 to conform to the occupant's thigh length, and to provide better support of the thigh, further providing more comfortable The ride effect, and the extension member 76, utilizes the two slide bars 46 to disperse the pressure applied to the four end plugs 38, so that the extension members 76 have sufficient structural strength and are less susceptible to damage. The basic teachings of this creation have been described, and many extensions and variations will be apparent to those of ordinary skill in the art. For example, the seat back 3 1 and the second support section 24 of the seat can be removed. The seat cushion 5 6 of such a seat still provides space for the user to ride, and does not affect the adjustment length of the seat cushion 56. The merits of this. The two legs 8 8 of the extension member 76 can be removed, and the extension member 76 is displaced between the retracted position and the extended position in the state in which the two legs 8 8 are missing. Or the two wall panels 86 of the extension member 76 can be removed. When the two support walls 86 are absent, the combined strength of the extension member 76 and the two sliders 64 will be slightly reduced but still sufficient to support the occupant's thigh. the weight of. Alternatively, the chair frame may be in the form of a phase of the invention, such as a bribe 2 Q. The touch may be formed by a T-shaped profile extending perpendicularly from the first 9 M417850 support section 2 2 . The present invention disclosed in the specification is intended to be illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and is not intended to be limited by the scope of the invention. [Simple description of the drawing] The first figure is a three-dimensional exploded appearance of the creation seat. The first picture is a combined stereoscopic view of the creation seat. The third figure is the elevation diagram of the second figure. The fourth figure is a cross-sectional view taken along line 4-4 of the third figure. The fifth figure is a cross-sectional view taken along line 5-5 of the third figure. The sixth figure is a partially enlarged view of the rear side of the second figure. The seventh figure is a perspective view showing the extension of the extension member from the retracted position to the extended position in the state of the second figure. The eighth figure is a cross-sectional view in which the extension member is displaced from the retracted position to the extended position in the state of the fifth figure. [Main component symbol description] 20 0 frame 2 2 first support section 2 4 second support section 2 6 leg 2 8 inner side 2 9 connecting rod 3 〇 ferrule 3 1 seat back 3 2 front end 3 3 joint 3 4 rear end 3 6 perforation 3 8 end plug 4 0 flange 4 2 plug body 4 4 slide hole 4 6 slide rod 4 8 first end 5 0 second end 5 2 locking element 11 M417850 5 4 spacer 5 8 body 6 1 bottom surface 6 4 second side 6 8 ventilation groove 7 2 groove 7 6 extension piece 8 0 front wall 8 4 convex part 8 8 foot 5 6 seat 塾 6 0 top surface 6 2 first side 6 6 side 7 0 binding column 7 4 recess 7 8 top wall 8 2 abutting surface 8 6 supporting wall 9 0 locking element 12