200938129 六、發明說明： — f發明所屬之技術領域】 本發明係關於椅子的靠背安裝構造。 【先前技術】 先前，已知有一種具有靠背的椅子 文獻1)。專利文獻丨的椅子，係如第例如，參照專利 由背架41與設置於此背架内侧的背：所示，具有·· 背40、用以支持此靠背40 _承台43、 所構成之靠 台43的腳44、以及被配置於承A 如地支持承 北 承σ 43上的座部45。 皮架41與背板42係藉由樹脂—體 背40，設置從兩側向下方延伸的安裝 ，於靠 48將安裝腳部46固定 ：厂46。藉由螺栓 ❹ 持㈣上，來將靠背4。安承裝：：上方延伸的支 部係藉由蓋部件49遮蔽。 螺栓48的碩 專利文獻1 ·日本專利公開公報特開—號 【發明内容】 仁疋，先别的具有背架與背板一體成形的靠背之椅 子因罪旁僅以螺栓與螺帽等的固定具，安裝於承台上， 而有固定具的數量增加’組裝作業變得麻煩的問題。另 外亦有因固定具露出外部而損及外觀的問題。 3 200938129 另外，亦已知有椅子，春益 打卞 先藉由嵌入成形來將螺帽一體 成形於背架中，將背架菊¥#$ 、 於承α上後，從承台側插入螺 栓，然後旋入背架的蟫嶒、 叼螺帽中，糟此，將背架固定於承台上； 但疋’此情況時，例如格不麻$ Π+ 行子廢棄時，必須分離樹脂製的背 架與金屬製的螺帽’作業麻煩。 本發明係有鐘於如此的問題而開發出來’其課題係提 供種靠#的安裝構造，其組裝作業容易且廢棄作業容 易，且可改善外觀。 ❹ 為了解決上述課題，本發明係採用以下的手段。 亦ρ本發明係具備藉由腳支持的承台、以及要被安 裝在上述承台上的靠背’且該靠背的背架與設置於上述背 架内的m體成形之形態的椅子的靠背安裝構造，盆 係具備： 被設置於上述承台或上述背架的任_方上，而往上下 方向延伸的安裝孔；以及 ❹ 纟6^置於另—方上’要被插人上述安裝孔中的安裝轴。 若根據本發明，僅將被設置於靠背或承台的其中一方 上的安裝軸，插入被設置於另一方上的安裝孔中，即可將 靠背安裝於承台上。藉此，因可利用安褒轴與安裝孔的欲 合力來支持靠背，所以不需要用以固定靠背與承台的固定 具或可減少其數量，可降低零件數量與組裝的工時。另 外，因露出外部的固定具的數量減少而改善外觀。 在此，可以構成：上述安裝孔或上述安裝軸是被設置 於上述背框的從上述承台算起的預定高度位置。另外，可 4 200938129 以構成：上述承台具有向上方延伸的背支柱，上述安裝孔 或上述安裝軸是被設置於上述背支柱的前端部。另外，在 上述安裳孔中，可設置用以限制上述安裝轴的相對移動之 移動限制部。 - 另外，可以構成更具備有：被設置於上述安裝孔的底 部侧，插入螺帽的螺帽插入孔；以及被設置於上述安裝 軸，插入螺栓的螺栓孔，該螺栓要旋入上述螺帽。 ❹ 若根據此構成，在將安裝軸插入安裝孔之際，先將螺 ta插入螺帽插入孔，然後將螺栓插入安裝軸的螺栓孔中， 進而旋入螺帽中，藉此可更確實地將靠背固定於承台。另 外，因螺帽未一體成形於背框，所以在椅子廢棄之際，不 需要分離背框與螺帽，廢棄作業變得容易。另外，藉由作 成分別將螺帽與螺栓整個地插入螺帽插入孔或螺栓孔中 的構成，能夠避免螺栓與螺帽露出外部，可更改善外觀。 若根據本發明，可降低靠背與承台的組裝作業的工 . 時，且椅子的廢棄處理變得容易，且可謀求改善外觀。 【實施方式】 以下，基於圖式詳細地說明本發明之椅子的靠背安裝 構造的實施形態。又，以下的實施形態係一實施例，但本 發明係不限於此實施形態。 第1圖係表示適用本發明之椅子的靠背安裝構造之椅 子1的正面圖。此椅子i具有：腳U、藉由此腳n而被 支持成可旋轉自如的承台12、設置於承台12上的座部 5 200938129 前 13、以及從座部13的後端侧向上方延伸的靠背14。又， 第1圖〜第10圖中的「上」、「下」、「左」、「右」、 向 、「後」係表示以坐在椅子1上的利用者來看的方 接著，說明上$各構成要素。ispu具有從中央起放射 狀地延伸的複數# I致的足部lla、以及設置於這些足部lla的 前端的車輪11b。承台12係旋轉自如地設置於腳U的中 央。座部13係安裝於承台12之上。 靠背14 ’係如第2圖所示，配合利用者的背的形狀， 在座4 13側形成凹陷的f曲狀。另外，此靠背η的背架 2〇係形成約為棒狀，背板21係形成板狀。 ❹ —一者架20，係如第3圖所示，將從座部13算起 八預定度處’例如以對應標準的體格的利用者的腰的部 刀’作為基準部23，較此基準部23上側的部分以及較基 :部23下側的部分，分別向遠離座部13的方向傾斜適 *的角度亦即’基準部23往座部13側突出。 此靠背14，係‘镇 ^ . ，、如第4圖所示’具備：形成大約四角形 的框狀而作為背框 之摩架20、以及設置於此背架20内的 身板21。彦架2〇盘昔扣〇 I〆 ,,m .. ”者板21 ’係例如藉由具有柔軟性的合 成樹月曰而被一體忐彬 。者木20，係藉由從承台12向上方 延伸的作為支掊士曰&北丄 、干的者支柱22 ’來支持該背架20的兩侧。 背架20係具古· m、 與右框部20b ;以及用持背板21的兩側之左框部20a 用U連結這些左右框部20a、20b的上 下知之上框部2〇c 卜框邛20d。下框部20d的大約中央 6 200938129 部’係藉由螺栓而被固定於用以連結背 件22…藉此’靠背“的下侧係牢固地二= 上’其上側係比較容易變形。200938129 VI. Description of the invention: - Technical field to which the invention belongs. The present invention relates to a backrest mounting structure of a chair. [Prior Art] Previously, there was known a chair document 1) having a backrest. The chair of the patent document 系 is, for example, referred to by the back frame 41 and the back provided on the inner side of the back frame: as shown, having a back 40 for supporting the backrest 40 _ the pedestal 43 The leg 44 of the abutment 43 and the seat 45 which is disposed on the support A to support the north sigma 43. The leather frame 41 and the back plate 42 are attached by a resin-body back 40 extending downward from both sides, and the mounting leg 46 is fixed to the base 46: the factory 46. The backrest 4 is held by the bolts (4). Mounting: The upper extending branch is covered by the cover member 49. The patent document 1 of the bolt 48. The Japanese Patent Laid-Open No. [Invention] The other chair having the backrest integrally formed with the back frame and the back plate is only fixed by bolts and nuts, etc. The tool is mounted on the cap, and the number of fixtures increases, and the assembly work becomes troublesome. There is also the problem that the appearance of the fixture is exposed to the outside and the appearance is damaged. 3 200938129 In addition, there is also a chair. Chunyi snoring first inserts the nut into the back frame by insert molding. After inserting the back frame chrysanthemum ¥#$, on the bearing α, insert the bolt from the cap side. Then screw into the 蟫嶒 and 叼 nuts of the back frame, and the rest of the frame is fixed on the pedestal; but 此 'in this case, for example, the grid is not $ $ Π + when the line is discarded, it must be separated from resin. The back frame and the metal nut 'work troubles. The present invention has been developed in response to such problems. The subject of the present invention is to provide a mounting structure for the seedling, which is easy to assemble and easy to dispose, and which can improve the appearance. In order to solve the above problems, the present invention employs the following means. Also, the present invention is provided with a platform supported by a foot, and a backrest of a backrest that is to be mounted on the above-mentioned pedestal, and a backrest of the backrest of the backrest and a m-body formed in the above-described back frame In the structure, the basin system is provided with: a mounting hole that is provided on the y-square of the above-mentioned pedestal or the above-mentioned back frame, and that extends in the up-and-down direction; and ❹ ^ 6^ is placed on the other side to be inserted into the above-mentioned mounting hole The mounting shaft in . According to the present invention, the backrest can be attached to the pedestal by inserting only the mounting shaft provided on one of the backrest or the pedestal into the mounting hole provided on the other side. Thereby, since the backrest can be supported by the combined force of the ampoule shaft and the mounting hole, the fixing means for fixing the backrest and the cap can be eliminated or the number thereof can be reduced, and the number of parts and the man-hour of assembly can be reduced. In addition, the appearance is improved by the reduction in the number of external fixtures exposed. Here, the mounting hole or the mounting shaft may be formed at a predetermined height position from the above-mentioned receiving frame provided on the back frame. Further, in the case of the above-mentioned pedestal, the pedestal has a back pillar extending upward, and the mounting hole or the mounting shaft is provided at a front end portion of the back pillar. Further, in the above-mentioned anchor hole, a movement restricting portion for restricting the relative movement of the above-mentioned mounting shaft may be provided. Further, the nut may be further provided with a nut insertion hole that is provided at a bottom side of the mounting hole, and a nut insertion hole that is provided in the mounting shaft and that is inserted into the bolt, and the bolt is screwed into the nut . ❹ According to this configuration, when the mounting shaft is inserted into the mounting hole, the screw ta is first inserted into the nut insertion hole, and then the bolt is inserted into the bolt hole of the mounting shaft, and then screwed into the nut, thereby more reliably Secure the backrest to the cap. In addition, since the nut is not integrally formed in the back frame, it is not necessary to separate the back frame and the nut when the chair is discarded, and the disposal work becomes easy. Further, by forming the nut and the bolt into the nut insertion hole or the bolt hole as a whole, it is possible to prevent the bolt and the nut from being exposed to the outside, and the appearance can be further improved. According to the present invention, it is possible to reduce the work of assembling the backrest and the pedestal, and it is easy to dispose of the chair, and the appearance can be improved. [Embodiment] Hereinafter, an embodiment of a backrest mounting structure of a chair of the present invention will be described in detail based on the drawings. Further, the following embodiments are merely one embodiment, but the present invention is not limited to the embodiments. Fig. 1 is a front elevational view showing the chair 1 of the backrest mounting structure to which the chair of the present invention is applied. This chair i has a foot U, a pedestal 12 that is rotatably supported by the foot n, a seat portion 5 provided on the pedestal 12, a front portion 13 200938129, and a rear side from the rear end side of the seat portion 13. Extended backrest 14. In addition, "upper", "lower", "left", "right", "direction" and "back" in the first to the ninth drawings indicate that the user sitting on the chair 1 looks at the side, and then explains On top of each component. The ispu has a plurality of feet 11a extending radially from the center, and wheels 11b provided at the tips of the legs 11a. The cap 12 is rotatably disposed at the center of the foot U. The seat portion 13 is mounted on the platform 12. As shown in Fig. 2, the backrest 14' is formed in a concave f-shape on the side of the seat 4 13 in accordance with the shape of the back of the user. Further, the back frame 2 of the backrest η is formed in a substantially bar shape, and the back plate 21 is formed in a plate shape. As shown in FIG. 3, the first frame 20 is used as the reference portion 23 from the seat portion 13 at the predetermined degree, for example, the portion of the waist of the user corresponding to the standard physique. The portion on the upper side of the portion 23 and the portion on the lower side of the base portion 23 are inclined at an angle that is inclined away from the seat portion 13, that is, the reference portion 23 protrudes toward the seat portion 13 side. The backrest 14, which is shown in Fig. 4, has a frame 20 which is formed in a frame shape of approximately a square shape as a back frame, and a body panel 21 provided in the back frame 20.彦 〇 2 〇 昔 〇 〇 〆 〆 , , , , , , 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者 者The side is extended as a branch 曰 & Beibei, dry pillar 22' to support both sides of the back frame 20. The back frame 20 is provided with the ancient m, and the right frame portion 20b; and the back plate 21 is used. The left frame portion 20a on both sides connects the upper and lower frame portions 2a and 2b of the left and right frame portions 20a and 20b to each other. The approximately central portion 6200938129 of the lower frame portion 20d is fixed by bolts. In order to join the back piece 22, the lower side of the 'backrest' is firmly fixed to the upper side and the upper side thereof is relatively easily deformed.
e 此背架20,從背面（後方）來看，從左右框部2〇a、 20b的基準部23起的上側部分，係形成上寬狀，從基準部 23起的下側部分係形成下寬狀。亦即’從背面（後方广來 看時，左右框部20a、20b的基準部23係形成中間較窄的 形狀。另外’背板21具有多數個菱形孔24而形成網狀。 另外，背板21的基準部23的上下的預定的範圍H，係形 成較其他部分厚。 靠背14，係如第4圖所示，藉由安裝部25而被安裝 於承台12的背支柱22上。此安裝部25,係如第5圖所示， 具有：設置於承台12的背支柱22或靠背14的背架20的 任一方上，而往上下方向延伸的滑孔（安裝孔）26 ;以及 設置於另一方上，而往上下方向延伸的滑軸（安裝軸）27。 本實施形態中，於背架20的左右框部20a、20b中的 基準部23附近，設置向後方突出的突出部28，滑孔26 係設置在此突出部28中。另外，背支柱22的前端向上方 彎曲成大約直角，並設有安裝片29,於此安裝片29中， 設置向前方突出的滑軸27。又，亦可於背架20側設置滑 軸27，於背支枉22側設滑孔26。 另外，背架20的突出部28與背支柱22的安裝片29， 係藉由已插入突出部28内的螺帽50與已插入滑轴27内 的螺栓51加以緊固。 7 200938129 #架20的滑孔26，係如第6圖（3)、（1))所示， 向突出部28的下側開口。另外，在滑孔26中，設置橫亙 全長地向後方貫通的溝30。本實施形態中，滑孔26係形 成。丨面為四角形。另外，滑孔26的底面26a，係發揮作為 移動限制部的機能，用以限制滑轴27的相對移動。再者， 在滑孔26的底面26a側，設置用以從外部插入螺帽5〇(參 照第5圖）的螺帽插入孔52。e The back frame 20 has an upper portion from the reference portion 23 of the left and right frame portions 2a, 20b as viewed from the back (back), and the lower portion from the reference portion 23 is formed. Wide. In other words, the base portion of the left and right frame portions 20a and 20b has a narrow shape in the middle, and the back plate 21 has a plurality of rhombic holes 24 to form a mesh shape. The predetermined range H of the upper and lower portions of the reference portion 23 of 21 is thicker than the other portions. The backrest 14, as shown in Fig. 4, is attached to the back post 22 of the cap 12 by the mounting portion 25. As shown in FIG. 5, the mounting portion 25 has a slide hole (mounting hole) 26 that is provided on one of the back post 22 of the cap 12 or the back frame 20 of the backrest 14, and that extends in the up-and-down direction; A slide shaft (mounting shaft) 27 that is provided on the other side and extends in the vertical direction. In the present embodiment, a protruding portion that protrudes rearward is provided in the vicinity of the reference portion 23 of the left and right frame portions 20a and 20b of the back frame 20. 28, the slide hole 26 is provided in the protruding portion 28. Further, the front end of the back stay 22 is bent upward at an approximately right angle, and is provided with a mounting piece 29, in which the slide shaft 27 protruding forward is provided. Further, a slide shaft 27 may be disposed on the side of the back frame 20, and a slide hole 26 may be provided on the side of the back support 22. In addition, the protruding portion 28 of the back frame 20 and the mounting piece 29 of the back post 22 are fastened by the nut 50 inserted into the protruding portion 28 and the bolt 51 inserted into the sliding shaft 27. 7 200938129 #架20 The slide hole 26 is opened to the lower side of the protruding portion 28 as shown in Fig. 6 (3) and (1). Further, the slide hole 26 is provided with a groove 30 which penetrates the entire length of the slide hole rearward. In the present embodiment, the slide hole 26 is formed. The face is square. Further, the bottom surface 26a of the slide hole 26 functions as a movement restricting portion for restricting the relative movement of the slide shaft 27. Further, on the bottom surface 26a side of the slide hole 26, a nut insertion hole 52 for inserting a nut 5 (refer to Fig. 5) from the outside is provided.
背支柱22的滑軸27,係如第7圖（a)、（b)所示， 形成與滑孔26大約相似的形狀。此滑軸27，係隔著橫寬 L較滑軸27小的支持片31，而被設置於背支柱以上。另 外，滑轴27係被形成可容易地插入左右框部2〇a、2此的 滑孔26中，並能在滑孔26内滑順地作滑移移動。再者， 在滑軸27中設置螺拴孔53與埋頭孔54，要旋入螺帽5〇 中的螺栓51插入這些孔中。。 滑孔26與滑軸27的形狀、尺寸，係如第8圖所示， 係被形成n骨轴27完全地插入射L26㈣狀態下， 無間隙地互相嵌合，且利用者的向後推壓荷重作用於靠背 14之際（向後仰時）’不會變形或破損。又，本實施形態中， 係以滑孔26與滑轴27為剖面四角形的情況來說明，但滑 孔26與滑轴27的剖面亦可為圓形或是其他的各種形狀。 又，為易於觀看圖式，第8圖係省略菱形孔27。 將靠背 22上之際’如第9圖所示 14安裝於背支柱 先將螺帽50插入螺帽插入孔52，然後將靠背“配置在承 台12的兩側的背支柱22、22間的上方，使背架2〇的兩 8 200938129 侧的滑孔26與兩側的背支柱22的滑軸27對合。之後， 將靠背14降下，使該滑孔26與背支柱22的滑轴27嵌合。The slide shaft 27 of the back stay 22 has a shape similar to that of the slide hole 26 as shown in Figs. 7(a) and (b). The slide shaft 27 is provided above the back post via a support piece 31 having a lateral width L smaller than the slide shaft 27. Further, the slide shaft 27 is formed so as to be easily inserted into the slide hole 26 of the left and right frame portions 2a, 2, and is smoothly slidably moved in the slide hole 26. Further, a screw hole 53 and a countersunk hole 54 are provided in the slide shaft 27, and bolts 51 to be screwed into the nut 5'' are inserted into the holes. . The shape and size of the slide hole 26 and the slide shaft 27 are as shown in Fig. 8, and the n-bone shaft 27 is completely inserted into the L26 (four) state, and is fitted to each other without a gap, and the user pushes the load backward. When acting on the backrest 14 (when leaning back), it will not be deformed or damaged. Further, in the present embodiment, the case where the slide hole 26 and the slide shaft 27 are formed in a quadrangular shape is described. However, the cross section of the slide hole 26 and the slide shaft 27 may be circular or of various other shapes. Further, in order to facilitate the viewing of the drawings, Fig. 8 omits the rhombic holes 27. When the backrest 22 is attached to the rear pillar as shown in FIG. 9 , the nut 50 is first inserted into the nut insertion hole 52 , and then the backrest is disposed between the back pillars 22 and 22 on both sides of the cap 12 . Above, the slide holes 26 on the side of the two 8 200938129 of the back frame 2 are engaged with the slide shafts 27 of the back legs 22 on both sides. Thereafter, the backrest 14 is lowered to make the slide hole 26 and the slide shaft 27 of the back support 22 Chimerism.
更進一步地降下靠背14,使滑軸27於滑孔26内相對 地滑動。當安裝轴27被插入安裝孔26内某程度時，將螺 栓51插入螺栓孔53，然後旋入螺帽插入孔52内的螺帽 50中。藉此，如第1〇圖所示，滑轴27的上端接抵滑孔 26的底面（移動限制部）26a時，靠背14的下降停止。 藉此，靠背14被安裝於背支柱22上。又，亦可將滑孔26 叹置於煮支柱22上，而將滑轴27設置於背架20上。此 時，於滑孔26的下端面設置移動限制部26a。 如此，本實施形態的靠背的安裝構造，係可藉由將 靠背14從承台12的上方降下，使靠背u的滑孔26與背 支柱22的滑軸27嵌合，並作相對地滑動，來組裝靠背14 與承台12。因此，由於不需固定具或可減少固定具的數 量’所以可降低零件數量與組裝的工時。另外，因露出外 部的固定具的數量減少，可改善外觀。 另卜藉由與罪者14分別形成的螺帽5〇、螺栓51, 緊固靠背14的突出部28與背支柱22的安裝片29，可更 確實地將靠背U固定於背支柱22。女裝片29 了更 藉此，在靠背U的背架2。與背板21一體成形的情況 不用將螺帽嵌入成形於靠背14中，而可藉由從外部 『入的螺帽5〇與螺栓51，確實地將靠背14固定於背支柱 50二：此’椅子1廢棄時，不需要分離靠背14與螺帽 作業’廢棄作業變得容易。另外，因螺帽50與螺栓 9 200938129 ’因將靠背14與承台The backrest 14 is lowered further to slide the slide shaft 27 relatively within the slide hole 26. When the mounting shaft 27 is inserted into the mounting hole 26 to some extent, the bolt 51 is inserted into the bolt hole 53, and then screwed into the nut 50 in the nut insertion hole 52. As a result, as shown in Fig. 1, when the upper end of the slide shaft 27 abuts against the bottom surface (movement restricting portion) 26a of the slide hole 26, the lowering of the backrest 14 is stopped. Thereby, the backrest 14 is mounted on the back post 22. Further, the slide hole 26 may be placed on the cooking struts 22, and the slide shaft 27 may be placed on the back frame 20. At this time, the movement restricting portion 26a is provided on the lower end surface of the slide hole 26. As described above, in the attachment structure of the backrest of the present embodiment, the backrest 14 can be lowered from above the cap 12, and the slide hole 26 of the backrest u can be fitted to the slide shaft 27 of the back stay 22 and relatively slid. To assemble the backrest 14 and the cap 12. Therefore, the number of parts and the man-hours of assembly can be reduced since the number of fixtures can be reduced without fixing or reducing the number of fixtures. In addition, the appearance can be improved by the reduction in the number of fixtures exposed to the outside. Further, by the nut 5, the bolt 51 formed separately from the sinner 14, the protruding portion 28 of the backrest 14 and the attachment piece 29 of the back stay 22 are fastened, and the backrest U can be more reliably fixed to the back stay 22. The women's piece 29 is further used in the back frame 2 of the backrest U. When the back plate 21 is integrally formed, the nut is not inserted into the backrest 14, and the backrest 14 can be securely fixed to the back post 50 by the nut 5 and the bolt 51 that are externally inserted into the back plate. When the chair 1 is discarded, it is not necessary to separate the backrest 14 and the nut work. In addition, due to the nut 50 and the bolt 9 200938129 ' because the backrest 14 and the cap
地支持靠背14。 51係整體插入部件的内部， 外觀。 再者，本實施形態中， 部25設置於靠背14的基: 可防止露出外部，可謀求改善 12的安裝 ί近’所以即使是利用 2 3的情況，亦可確實 【圖式簡單說明】 第1圖係表示實施形態之椅子的正面圖。 第2圖係表示實施形態之椅子的俯視圖，是第i圖的 A方向視圖。 第3圖係表示實施形態之椅子的側面圖，是第丨圖的 β方向視圖。 第4圖係表示實施形態之靠背的背面圖，是第3圖的 C方向視圖。 第5圖係表示實施形態之靠背與承台的安裝部的側面 圖’是第4圖的ε方向視圖。 第6圖（a )係表示實施形態之背架的安裝軸的圖，是 、5圖的F方向視圖；第6圖（b)係表示安裝軸的剖面 的圖’是第6圖（a)的G—G剖面圖。 第第7圖（a)係表示實施形態之承台的安裝孔的圖，是 5圖的Η方向視圖；第7圖（b)係表示安裝 的圖，是第7圖“…剖面圖。 ]面 10 200938129 第8圖係表示實施形態之安裝孔與安裝軸的嵌合狀μ 的圖，疋第5圖的κ—κ剖面圖。 第9圖係表示承台的安裝軸插入實施形態之靠背的夂 裝孔中的方法的縱剖面圖。 第10圖係表示本實施形態之安裝軸完全插入 中的狀態圖》 衣扎 第11圖係表示先前例之椅子的立體圖。 ❹ 【主要元件符號說明】 1 :椅子 ❹ 41 11 a :足部 12 :承台 14 :靠背 2 0 a :左框部 2 〇 c :上框部 21 :背板 22a :連結部件 24 :菱形孔 Μ :滑孔 27 .滑軸 29 :安裂片 31 :支持片 背架 11 ： 腳 lib :車輪 13 ： 座部 20 ： 背架 20b :右框部 20d :下框部 22 ： 背支柱 23 ： 基準部 25 ： 安裝部 26a :移動限制部 28 ： 突出部 30 : 溝 40 ： 靠背 42 ： 背板 11 200938129 43 :承台 44 ： 45 :座部 46 ： 47 :支持桿 48 : 49 :蓋部件 50 : 51 :螺栓 52 : 5 3 :螺栓孔 54 ： 腳 安裝腳部 螺栓 螺帽 螺帽插入孔 埋頭孔The backrest 14 is supported. The interior of the 51-series insert unit, the appearance. Further, in the present embodiment, the portion 25 is provided on the base of the backrest 14: it is possible to prevent the external portion from being exposed, and it is possible to improve the installation of the 12's. Therefore, even if it is used in the case of 2 3, it can be confirmed [simple description of the drawing] 1 is a front view showing a chair of an embodiment. Fig. 2 is a plan view showing the chair of the embodiment, and is a view in the direction of the A in the i-th view. Fig. 3 is a side view showing the chair of the embodiment, and is a view in the β direction of the second drawing. Fig. 4 is a rear view showing the backrest of the embodiment, and is a view in the C direction of Fig. 3. Fig. 5 is a side view showing the mounting portion of the backrest and the shoe in the embodiment. Fig. 4 is a view in the ε direction of Fig. 4. Fig. 6(a) is a view showing a mounting shaft of the back frame of the embodiment, and is a view in the F direction of Fig. 5; Fig. 6(b) is a view showing a cross section of the mounting shaft. Fig. 6(a) G-G profile. Fig. 7(a) is a view showing a mounting hole of a cap according to an embodiment, and is a view in the Η direction of Fig. 5; Fig. 7(b) is a view showing a mounting view, and Fig. 7 is a cross-sectional view of Fig. 7. Surface 10 200938129 Fig. 8 is a view showing a fitting shape μ of the mounting hole and the mounting shaft of the embodiment, and Fig. 5 is a κ-κ sectional view of Fig. 5. Fig. 9 is a view showing the mounting shaft of the cap inserted into the backrest of the embodiment. Fig. 10 is a perspective view showing a state in which the mounting shaft of the present embodiment is fully inserted. Fig. 11 is a perspective view showing a chair of the prior art. ❹ [Main component symbol description 】 1 : Chair ❹ 41 11 a : Foot 12 : Base 14 : Backrest 2 0 a : Left frame 2 〇 c : Upper frame 21 : Back plate 22a : Connecting member 24 : Diamond hole : Slide hole 27 . Sliding shaft 29: rupture disc 31: support piece back frame 11: foot lib: wheel 13: seat portion 20: back frame 20b: right frame portion 20d: lower frame portion 22: back strut 23: reference portion 25: mounting portion 26a: Movement restricting portion 28: Projection portion 30: Groove 40: Backrest 42: Back plate 11 200938129 43 : Bearing platform 44: 45 : Seat 46 : 47 : Support rod 48 : 49 : Cover part 50 : 51 : Bolt 52 : 5 3 : Bolt hole 54 : Foot Mounting foot Bolt Nut Nut insertion hole Countersunk hole
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