JP2005034296A

JP2005034296A - Chair

Info

Publication number: JP2005034296A
Application number: JP2003199113A
Authority: JP
Inventors: Nobuaki Nasu; 信昭那須
Original assignee: Okamura Corp
Current assignee: Okamura Corp
Priority date: 2003-07-18
Filing date: 2003-07-18
Publication date: 2005-02-10
Anticipated expiration: 2023-07-18
Also published as: JP4238082B2

Abstract

<P>PROBLEM TO BE SOLVED: To simply and firmly fix the circumferential end part of a surface material of a chair to a seat shell. <P>SOLUTION: A synthetic resin seat frame 10 which has an inward support piece 14, is formed into a frame shape and has an upward piece 15 erected from the outer circumferential edge of the inward support piece 14, at least, in left/right side frames 10a and a rear frame 10b is mounted on the upper part of a leg frame 3 having a pair of left/right support rods 3a facing in the front/rear direction in its upper end. The plate-shaped seat shell 11 which has a cushion material 12 covered with the surface material 13 in its upper surface and has its central part formed of synthetic resin and being downward elastically deformable is fitted in the frame surrounded with the upward piece 15 in the seat frame 10 by clamping the circumferential edge part of the surface material 13 folded back to the lower surface, between the upper surface of the inward support piece 14 of the seat frame 10 and the lower surface of the outer circumferential part of the seat shell 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、上面がクッション材と表皮材により覆われた合成樹脂製の座シェルを備える椅子に関する。
【０００２】
【従来の技術】
この種の椅子において、座シェルの上面にクッション材を取付け、その上面をカバー等の表皮材により覆う際には、表皮材が、着座者の体重により引っ張られたり、着座中の粗暴な動作により外れたりしないように、その周端部を、座シェルに固定する必要がある。
【０００３】
従来は、表皮材の周端部を、座シェル（座板）の周端部下面に接着して固定したり（例えば特許文献１参照）、座シェルを内シェルと外シェルとからなるものとし、内シェルの上面に取付けたクッション材の上面を覆う表皮材の前端部を、外シェルの前端部の下向き折曲部に形成したＵ字状断面の嵌合溝に、内シェルの前端部に設けた係合片を、表皮材と共に折り返して係合させることにより固定し、かつ内シェルの左右両端部を下向きに屈曲し、この屈曲部を、表皮材の左右の端部と共に、外シェルの左右両側部に設けた段部に嵌合して固定するなどしている（例えば特許文献２参照）。
【０００４】
【特許文献１】
特開平８−２５６８７２号公報（図７）
【特許文献２】
特開平１１−２７６２９２号公報（図３、図４）
【０００５】
【発明が解決しようとする課題】
上記特許文献１のように、表皮材の周端部を座シェルの下面に接着して固定したのでは、その固定作業が面倒であり、作業能率が悪い。
また、損耗した表皮材を交換する際などに、接着剤が剥れにくく、交換作業も面倒となる。
【０００６】
上記特許文献２に記載されている椅子では、表皮材の前端部の周端部は強固に固定されるが、左右両側の周端部においては、外シェルの段部において、該外シェルと内シェルとの屈曲部により側方から挟持されているのみであるので、表皮材が左右方向に無理に引っ張られると、周端部が外れたりずれたりする恐れがある。
【０００７】
また、特許文献１及び２の椅子では、いずれも、座の剛性を高めるために、外シェル全体を厚肉としたり、座板に補強突条を設けたりしているので、座が下方に撓みにくく、座り心地が悪いという問題もある。
【０００８】
本発明は、上記問題点に鑑みてなされたもので、表皮材の周端部を、座シェルに、簡単かつ強固に固定しうるとともに、座の撓み性を大として、座り心地を向上させた、椅子を提供することを目的としている。
【０００９】
【課題を解決するための手段】
本発明によると、上記課題は、次のようにして解決される。
（１）上端に前後方向を向く左右１対の支持杆を有する脚フレームの上部に、内向きの支持部を有する枠状をなし、かつ少なくとも左右の側枠と後枠とに、前記支持部の外周端より起立する上向片を有する合成樹脂製の座枠を載設するとともに、前記座枠における上向片により囲まれた枠内に、表皮材により覆われたクッション材を上面に有し、かつ中央部が下向きに弾性変形可能な合成樹脂よりなる板状の座シェルを、その下面に折り返した前記表皮材の周端部を、前記座枠の内向きの支持部の上面と座シェルの外周部の下面により挟持するようにして嵌着する。
【００１０】
（２）上記（１）項において、座シェルの左右両側端と後端とに、座枠の上向片の内面に摺接する枠状片を立設する。
【００１１】
（３）上記（１）または（２）項において、座シェルの外周部下面に、下端に上向鉤状の係合爪を有する複数の係合片を突設し、各係合片の係合爪を、座枠の内向の支持部に設けた係止孔、または支持部の内周縁部下面に弾性係合させることにより、座枠に座シェルを着脱可能に嵌着する。
【００１２】
（４）上記（１）〜（３）項のいずれかにおいて、座枠の左右の上向片の上端に、外向きのフランジ片を連設し、両フランジ片を、左右の支持杆の上面により支持することにより、座枠を左右の支持杆の間に設ける。
【００１３】
（５）上記（１）〜（４）項のいずれかにおいて、左右の支持杆における前部と後部同士の対向面間に、左右方向を向く座支持部材を横架し、座枠の後端部下面と座シェルの前端部下面とを、それぞれ、前記後部座支持部材と前部座支持部材とにより支持し、前後の座支持部材の下方より座シェルに向かって螺合したねじにより、座枠と座シェルとを脚フレームに固定する。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
図１は、本発明の椅子におけるフレーム（１）の斜視図、図２は、同じく座（２）の分解斜視図、図３は、座（２）取付時の中央縦断拡大側面図である。
【００１５】
椅子のフレーム（１）は、スチールパイプよりなる左右１対の脚フレーム（３）（３）と、それらの前後方向を向く水平の支持杆（３ａ）の前後の対向面間に左右方向を向いて固着された金属製の前部座支持部材（４）及び後部座支持部材（５）と、脚フレーム（３）の上下方向を向く前脚部（３ｂ）（３ｂ）の上端部間に固着された連結杆（６）とからなり、脚フレーム（３）の上下方向を向く後脚部（３ｃ）（３ｃ）の上端部間には、背凭れ（７）が取付けられている。
【００１６】
上記前部座支持部材（４）は、中央部がやや下向きに湾曲する側面視ほぼ上向コ字状をなし、その左右両端部には通孔（８）が穿設されている。
【００１７】
上記後部座支持部材（５）は、左右両端が支持杆（３ａ）（３ａ）の下面に固着され、かつ中央部が後向きに膨出するように円弧状に湾曲された水平支持板（５ａ）と、その後端縁より、やや斜め後ろ上方に向かって円弧状に起立する上向支持板（５ｂ）とにより、側面視ほぼＬ字状の断面形状とされ、水平支持板（５ａ）の左右両端部には、通孔（８ａ）が、また中央部の前端縁には、平面視コ字状の切欠き溝（９）がそれぞれ形成されている。
【００１８】
座（２）は、座枠（１０）、座シェル（１１）、発泡ポリウレタン等のクッション材（１２）、及びクロス等の表皮材（１３）よりなっている。
【００１９】
座枠（１０）は、硬質合成樹脂により、中央が大きく開口する概ね方形枠状に一体成形され、その左右の側枠（１０ａ）（１０ａ）と後枠（１０ｂ）は、内向支持片（１４）と上向片（１５）とにより、内向Ｌ字状断面をなしている。
【００２０】
両側枠（１０ａ）と後枠（１０ｂ）との上向片（１５）の上端には、それぞれ、左右の脚フレーム（３）の支持杆（３ａ）の上面に載置可能な外向フランジ片（１６）（１６）と、上端が下向Ｕ字状に折曲された、後部座支持部材（５）における上向支持板（５ｂ）の前面と上端を覆いうる大きさの斜め後ろ上方を向く傾斜フランジ片（１７）とが、一体成形されている（図３参照）。
【００２１】
後部側の内向支持片（１４）と傾斜フランジ片（１７）は、後部座支持部材（５）とほぼ同様に後向き円弧状に湾曲され、後部側の内向支持片（１４）の左右両端部には、後部座支持部材（５）の水平支持板（５ａ）の上面に載置した際に、その通孔（８）と整合する通孔（１８）が穿設されている。
【００２２】
図４に示すように、傾斜フランジ片（１７）と上向片（１５）との後面の隅部には、後部座支持部材（５）の水平支持板（５ａ）の上面と上向支持板（５ｂ）の前面とに当接可能な、垂直板状の後向きの多数の補強リブ（１９）が形成されている。
【００２３】
座枠（１０）の前枠（１０ｃ）は、斜め前下方に傾斜するとともに、図３に示すように、側面視ほぼ上向コ字状断面に形成され、その上記外向フランジ片（１６）と連続する前片（２０ａ）と後片（２０ｂ）は、それらの対向面間に結合された複数のリブ（２１）により補強されている（図４参照）。
【００２４】
なお、上記複数のリブ（２１）と後片（２０ｂ）とにより、内向きの支持部が形成され、この支持部に、座シェル（１１）の後記する前枠片（１１ｂ）が支持されるようになっている。
【００２５】
上記後片（２０ｂ）の中間部には、横長方形状の係止孔（２２）を有する左右１対の係止片（２３）（２３）が、斜め後ろ上方を向いて突設されている（図８参照）。
【００２６】
また、左右の側枠（１０ａ）の内向支持片（１４）の中間部には、係止突片（２４）が内向きに突設されている。
【００２７】
上記座シェル（１１）は、図５にも示すように、座枠（１０）の枠内に挿脱可能に嵌合される概ね方形浅皿状をなし、全体が合成樹脂により一体成形されている。
【００２８】
座シェル（１１）の左右及び後部の上方を向く枠状片（１１ａ）の上下寸法は、座枠（１０）における側枠（１０ａ）と後枠（１０ｂ）の上向片（１５）の上下寸法とほぼ等寸とされている。
【００２９】
また、座シェル（１１）の前端部は、斜め前下方に向かって円弧状に湾曲され、かつその前端には、座枠（１０）の前枠（１０ｃ）における前片（２０ａ）と後片（２０ａ）間において前端下面が前片（２０ａ）の上端に当接する前枠片（１１ｂ）が、斜め前上方を向いて連設されている（図５参照）。
【００３０】
前枠片（１１）と底板（２５）の前端部の断面形状は、概ね側面視Ｌ字状をなしている。
【００３１】
座シェル（１１）における若干下方に湾曲している底板（２５）のやや後方寄りには、図６及び図７の底面斜視図にも示すように、底板（２５）の上面の一部を上面が開口するＵ字状断面をなすように下向きに屈曲成形することにより、底板（２５）の厚さよりも若干薄肉をなす左右両側部の前向凹条部（２６ａ）（２６ａ）と、後部側の横向凹条部（２６ｂ）とからなる平面視前向Ｕ字形の可撓性凹条（２６）が設けられている。
【００３２】
可撓性凹条（２６）により囲まれた底板（２５）の中央部の大きさは、着座者の平均的な臀部の大きさよりも若干大とされ、その部分には、多数の小孔（２７）が穿設され、撓み易くしてある。
【００３３】
図６及び図７に示すように、可撓性凹条（２６）における前向凹条部（２６ａ）の後部と、横向凹条部（２６ｂ）の左右両側部とには、可撓性凹条（２６）を不連続とするように、それと直交する方向を向くスリット（２８）が形成されている。この各スリット（２８）は、図５に示すように、底板（２５）の上面まで貫設され、かつその両端は円弧状としてある。
【００３４】
図７に拡大して示すように、各スリット（２８）の裏面側の両基部には、スリット（２８）により分割された可撓性凹条（２６）の隣接端部を結合することにより、その部分を補強するリブ（２９）が、スリット（２８）の両端を囲むようにして一体的に突設されている。
【００３５】
左右の前向凹条部（２６ａ）の前端は、底板（２５）の下面に開口し、その開口端と近接する底板（２５）にも、左右方向を向くスリット（２８）（２８）が形成され、その裏面の周縁部と、前向凹条部（２３ａ）の左右の開口基部とは、リブ（３０）により補強されている。
【００３６】
図３及び図６に示すように、座シェル（１１）の底板（２５）の前端部下面には、上記前部座支持部材（４）における前後の上端に上方より嵌合して位置決めするための前後１対の突条（３１）（３１）が、左右方向を向いて突設されている。
【００３７】
底板（２５）の下面における上記突条（３１）間の左右両端部には、上記前部座支持部材（４）の通孔（８）と整合する貫通孔（３２）を有する取付ボス（３３）（３３）が、下向きに突設されている。
【００３８】
両取付ボス（３３）の貫通孔（３２）には、図３に示すように、前部座支持部材（４）の下方より挿通したタッピングスクリュウ（３４）が螺合され、座シェル（１１）の前端部下面が、前部座支持部材（４）の上面に固定されるようになっている。
【００３９】
底板（２５）の後端部下面の左右両側部にも、上記と同様の取付ボス（３３）（３３）が突設され、この取付ボス（３３）の貫通孔（３２）には、後部座支持部材（５）の通孔（８）と座枠（１０）の内向支持片（１１）の通孔（１８）とに下方より挿入したタッピングスクリュウ（３４）（３４）（図１参照）が螺合され、座枠（１０）とそれに嵌合される座シェル（１１）とが、共に後部座支持部材（５）に固定されるようになっている。
【００４０】
図５、図６及び図８に示すように、座シェル（１１）における底板（２５）の前端の中央部下面には、斜め前下方を向き、かつ前端に上向鉤状の係合爪（３５ａ）を有する左右１対の係合片（３５）（３５）が突設され、それらの係合爪（３５ａ）は、座シェル（１１）を座枠（１０）に嵌合した際において、座枠の（１０）の前枠（１０ｃ）における後片（２０ｂ）の係止片（２３）に形成された係止孔（２２）に弾性係合されるようになっている。
【００４１】
底板（２５）における両側部下面の前後方向の中間部と後端部の中央下面には、図３、図４及び図９に示すように、遊端部に上向鉤状の係合爪を有する外向Ｊ字状断面をなす係合片（３６）が、下向きに突設されている。
【００４２】
左右の係合片（３６）における遊端側の上端は、座シェル（１１）を座枠（１０）に嵌合した際、内向きに弾性変形させられて押圧されることにより、座枠（１０）の左右の内向支持片（１４）に突設した係止突片（２４）の下面に係合するようになっている（図９参照）。
【００４３】
後端中央部の係合片（３６）における遊端側の上端は、図３に示すように、座枠（１０）の後部側の内向支持片（１４）の下面に弾性係合するようになっている。
【００４４】
座（２）を組立てるには、まず座シェル（１１）の枠内にクッション材（１２）を挿入して載置し、このクッション材の表面を、次のようにして表皮材（１１）により覆う。
【００４５】
クッション材（１２）の上面に重ねた表皮材（１３）の周縁部を、座シェル（１１）の下面側に若干折り返したのち、表皮材（１３）の袋状縁部（１３ａ）に挿通した締付紐（３７）を締め上げて緊張させ、クッション材（１２）の表面と座シェル（１１）の周端部をくるんで被覆する。
【００４６】
ついで、座シェル（１１）を座枠（１０）の枠内に、次の要領で固定する。
すなわち、まず座シェル（１１）の底板（２５）の前端部下面に設けた１対の係合片（３５）の係止爪（３５ａ）を、座枠（１０）における前枠（１０ｃ）の後片（２０ｂ）に設けた１対の係止片（２３）の係止孔（２２）に係合させたのち、座シェル（１１）全体を下向きに押圧し、底板（２５）の左右両側部と後端部に設けた３個の係合片（３６）を、上述したように、座枠（１０）の係止突片（２４）と内向支持片（１４）の下面に弾性係合させる。
【００４７】
これにより、座シェル（１１）は、その底板（２５）の左右両側部と後部側の下面が、座枠（１０）の内向支持片（１４）により支持されるとともに、前枠片（１１ｂ）の下面が、座枠（１０）の前枠（１０ｃ）の上面に当接した状態で、座枠（１０）の枠内に安定的に固定される。
【００４８】
この際、座シェル（１１）の下面側に折り返された表皮材（１３）における左右両側と後部側の周端部は、座枠（１０）の内向支持片（１４）と上向片（１５）、及び座シェル（１１）の枠状片（１１ａ）と底板（２５）の下面間において、それらにより挟持され、かつ前部の周端部は、座枠（１０）の前枠（１０ｃ）と座シェル（１１）の前枠片（１１ｂ）間において、それらにより挟み込まれるので、表皮材（１３）の全周端部の挟持面積が大となり、座シェル（１１）より簡単に外れたりする恐れはない（図３参照）。
【００４９】
このようにして組立てた座（２）を、椅子のフレーム（１）に取付けるには、まず左右の脚フレーム（３）における支持杆（３ａ）の上面に、座枠（１０）の左右の外向フランジ片（１６）を載置するとともに、後部座支持部材（５）における水平支持板（５ａ）の上面に、座枠（１０）の後部側の内向水平片（１４）を載置し、上向支持板（５ｂ）の前面に補強リブ（１９）を当接させ、かつそれと同時に、座枠（１０）に装着した座シェル（１１）の底板（２５）の前端部下面を、それに設けた前後の突条（３１）（３１）により位置決めして、前部座支持部材（４）の上端に載置する。
【００５０】
ついで、前後の座支持部材（４）（５）の下方より挿通した前後２本ずつのタッピングスクリュウ（３４）を、座シェル（１１）の取付ボス（３３）に向かって螺合する。
【００５１】
これにより、座（２）は、座シェル（１１）とクッション材（１２）とが左右の支持杆（３ａ）間に位置するようにして、脚フレーム（３）の上部に安定的に固定される（図３参照）。
【００５２】
また、座（２）の取付時において、座シェル（１１）は、前後のタッピングスクリュウ（３４）により、座枠（１０）に引き付けられて強く固定されるため、座シェル（１１）の下面に折り返された表皮材（１３）の周端部が、座枠（１０）の内向支持片（１４）と座シェル（１１）の底板（２５）の下面、及び座枠（１０）の前枠（１０ｃ）の上面と座シェル（１１）の前枠片（１１ｂ）の下面により強く挟圧される。
【００５３】
従って、表皮材（１３）が前後左右方向に強く引っ張られても、その周端部が座シェル（１１）より外れたり、ずれたりする恐れはない。
【００５４】
取付後の座（２）に着座すると、図１０に示すように（クッション材及び表皮材は図示略）、座シェル（１１）の底板（２５）の中央部が、可撓性凹条（２６）を中心として座枠（１０）の開口を通って下方に撓む。
【００５５】
すなわち、着座者の臀部の荷重が、底板（２５）における可撓性凹条（２６）により囲まれた中央部に加わると、薄肉とした可撓性凹条（２６）が、図１０の２点鎖線のように拡開方向に弾性変形することにより、底板（２５）の中央部が下方に沈み込むように円弧状に撓む。
【００５６】
しかも、可撓性凹条（２６）は、複数のスリット（２８）を設けて不連続状としてあるので、その撓み剛性は小さくなり、かつ底板（２５）の中央部の撓み性は、大となって、座り心地が向上する。
【００５７】
スリット（２８）の基部はリブ（３０）により補強されているため、底板（２５）の中央部が繰り返し大きく撓んでも、スリット（２８）の基部を起点として、底板（２５）に亀裂等を発生させる恐れはない。
【００５８】
底板（２５）の中央部には、多数の小孔（２７）が穿設されているので、その部分を、臀部に沿って容易に撓ませることができ、座り心地がより向上する。
【００５９】
左右の脚フレーム（３）における水平杆（３ａ）の後端部間に、水平支持板（５ａ）と、後ろ上方に起立する上向支持板（５ａ）とからなる側面視ほぼＬ字状断面の剛性の高い後部座支持部材（５）を設け、その下面と前面に、座枠（１０）における後枠（１０ｂ）の上向片（１５）と傾斜フランジ片（１７）との後面に設けた多数の補強リブ（１９）の後端と下面とを当接させているので、座枠（１０）の後枠（１０ｂ）、すなわち、座枠（１０）、座シェル（１１）、クッション材（１２）、及び表皮材（１３）よりなる座（２）の後端部の支持面積が増大し、着座時の荷重が分散されて面圧が低下する。
【００６０】
その結果、座枠（１０）の後部の撓み変形が小さくなり、座（２）の後部が安定的に支持されるとともに、支持強度も大となる。
【００６１】
また、後枠（１０ｂ）の下面と後面は、金属製の後部座支持部材（５）により覆われているので、同一形状の椅子を、後部座支持部材（５）を下方に向けて多数積み重ねて保管する際等において、後枠（１０ｂ）の下面と後面が保護され、それに傷を付けたりするのが防止される。
【００６２】
しかも、多数積み重ねた椅子の荷重が、最下位の椅子の後部座支持部材（５）、及び座枠（１０）の傾斜フランジ片（１７）に上向きの反力として作用しても、多数の補強リブ（１９）が設けられているので、それらが上向きに大きく屈曲されて折損するなどの不具合が発生する恐れはない。
【００６３】
上記実施形態では、座シェル（１１）は、枠状片（１１ａ）を有するものとしたが、座シェル（１１）が比較的厚肉で、撓み剛性が大きい場合には、枠状片（１１ａ）を省略して平板状としたり、その左右両側部又は後部のものを省略したりすることもある。
【００６４】
座シェル（１１）の下面の３個の係合片（３６）を、座枠（１０）における内向き支持片（１４）の係合片（２４）の下面と、内向支持片（１４）の内周縁部の下面に弾性係合させているが、内向支持片（１４）に係合孔を穿設し、この係合孔に各係合片（３６）を弾性係合するようにしてもよい。
【００６５】
【発明の効果】
請求項１記載の発明によれば、座シェルの下面に折り返した表皮材の周縁部は、座枠に座シェルを嵌着する際に、それらにより上下方向から挟持されて簡単かつ強固に固定される。従って、従来のような接着剤を使用しなくても、表皮材が外れたり、ずれたりする恐れはない。
【００６６】
また、座シェルの周端部は、左右の側枠と後枠に上向片を有する剛性の高い枠状の座枠により支持されているので、座シェルを比較的薄肉とするなどして、その着座時における中央部の撓み性を大きくすることができ、座の座り心地が向上する。
【００６７】
請求項２記載の発明によれば、座シェルの周端部の剛性が大となるとともに、表皮材の周端部の挟持面積が増大するので、表皮材は、より強固に固定される。
【００６８】
請求項３記載の発明によれば、座シェルを座枠に押し込むだけで簡単に固定しうるとともに、着脱可能であるので、表皮材の交換等も容易に行うことができる。
【００６９】
請求項４記載の発明によれば、座枠とそれに嵌着した座シェル及びクッション材等を、左右の支持杆の間に、左右方向への位置ずれを防止して設けることができるとともに、両支持杆の上面がフランジ片により覆われるので、体裁が向上する。
また、座枠の左右の側枠の剛性が、フランジ片を設けたことでより大となる。
【００７０】
請求項５記載の発明によれば、座シェルの中央部の撓み性を損なうことなく、座枠と座シェルとを、前後の座支持部材により安定的に支持することができる。
また、ねじを、前後の座支持部材の下方より座シェルに螺合することにより、座枠の内向支持部の上面に、座シェルの外周部下面が強く当接し、それらにより挟持された表皮材の周端部が強く挟圧されることにより、その固定強度はより大となる。
【図面の簡単な説明】
【図１】本発明の椅子のフレームの斜視図である。
【図２】同じく、座の分解斜視図である。
【図３】同じく、座部の中央縦断拡大側面図である。
【図４】同じく、座枠の後方斜視図である。
【図５】同じく、クッション材を取外して示す座の平面図である。
【図６】同じく、座シェルの下面の斜視図である。
【図７】図６のＡ部の拡大図である。
【図８】図５のＶＩＩＩ−ＶＩＩＩ線の拡大縦断側面図である。
【図９】図５のＩＸ−ＩＸ線の拡大縦断面図である。
【図１０】図５のＸ−Ｘ線の拡大縦断面図である。
【符号の説明】
（１）フレーム
（２）座
（３）脚フレーム
（３ａ）支持杆
（３ｂ）前脚部
（３ｃ）後脚部
（４）前部座支持部材
（５）後部座支持部材
（５ａ）水平支持板
（５ｂ）上向支持板
（６）連結杆
（７）背凭れ
（８）通孔
（９）切欠き溝
（１０）座枠
（１０ａ）側枠
（１０ｂ）後枠
（１０ｃ）前枠
（１１）座シェル
（１１ａ）枠状片
（１１ｂ）前枠片
（１２）クッション材
（１３）表皮材
（１３ａ）袋状縁部
（１４）内向支持片（内向支持部）
（１５）上向片
（１６）外向フランジ片
（１７）傾斜フランジ片
（１８）通孔
（１９）補強リブ
（２０ａ）前片
（２０ｂ）後片
（２１）リブ
（２２）係止孔
（２３）係止片
（２４）係止突片
（２５）底板
（２６）可撓性凹条
（２６ａ）前向凹条部
（２６ｂ）横向凹条部
（２７）小孔
（２８）スリット
（２９）（３０）リブ
（３１）突条
（３２）貫通孔
（３３）取付ボス
（３４）タッピングスクリュウ（ねじ）
（３５）係合片
（３５ａ）係合爪
（３６）係合片
（３７）締付紐[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair including a synthetic resin seat shell whose upper surface is covered with a cushion material and a skin material.
[0002]
[Prior art]
In this type of chair, when a cushioning material is attached to the upper surface of the seat shell and the upper surface is covered with a skin material such as a cover, the skin material is pulled by the weight of the seated person or due to rough movements while sitting. It is necessary to fix the peripheral end portion to the seat shell so as not to come off.
[0003]
Conventionally, the peripheral end portion of the skin material is bonded and fixed to the lower surface of the peripheral end portion of the seat shell (seat plate) (see, for example, Patent Document 1), or the seat shell is composed of an inner shell and an outer shell. The front end portion of the skin material covering the upper surface of the cushion material attached to the upper surface of the inner shell is fitted into a U-shaped cross-section fitting groove formed in the downward bent portion of the front end portion of the outer shell, and the front end portion of the inner shell. The provided engagement piece is fixed by folding and engaging with the skin material, and the left and right end portions of the inner shell are bent downward, and the bent portion together with the left and right ends of the skin material are For example, they are fitted and fixed to stepped portions provided on the left and right sides (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
JP-A-8-256872 (FIG. 7)
[Patent Document 2]
Japanese Patent Laid-Open No. 11-276292 (FIGS. 3 and 4)
[0005]
[Problems to be solved by the invention]
If the peripheral edge part of the skin material is bonded and fixed to the lower surface of the seat shell as in Patent Document 1, the fixing work is troublesome and the work efficiency is poor.
In addition, when the worn skin material is replaced, the adhesive is difficult to peel off, and the replacement work becomes troublesome.
[0006]
In the chair described in Patent Document 2, the peripheral end portion of the front end portion of the skin material is firmly fixed. However, in the peripheral end portions on the left and right sides, the outer shell and the inner shell are formed at the step portion of the outer shell. Since it is only sandwiched from the side by the bent portion with the shell, if the skin material is forcibly pulled in the left-right direction, there is a possibility that the peripheral end portion may come off or shift.
[0007]
Moreover, in both the chairs of Patent Documents 1 and 2, in order to increase the rigidity of the seat, the entire outer shell is made thick or a reinforcing protrusion is provided on the seat plate, so the seat bends downward. There is also a problem that it is difficult and uncomfortable to sit.
[0008]
The present invention has been made in view of the above problems, and the peripheral edge portion of the skin material can be easily and firmly fixed to the seat shell, and the seat flexibility is improved to improve the seating comfort. The purpose is to provide a chair.
[0009]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) At the upper end of the leg frame having a pair of left and right support rods facing in the front-rear direction, a frame shape having an inward support portion is formed, and at least the left and right side frames and the rear frame have the support portions A synthetic resin seat frame having an upward piece standing up from the outer peripheral edge of the seat frame is placed, and a cushion material covered with a skin material is provided on the upper surface in the frame surrounded by the upward piece of the seat frame. And the peripheral edge of the skin material, which is a plate-shaped seat shell made of a synthetic resin whose center part can be elastically deformed downward, is folded back to the lower surface thereof, and the upper surface of the seat frame is supported on the upper surface of the seat frame. It fits so that it may be pinched | interposed by the lower surface of the outer peripheral part of a shell.
[0010]
(2) In the above item (1), frame-like pieces that are in sliding contact with the inner surface of the upward piece of the seat frame are erected on the left and right ends and the rear end of the seat shell.
[0011]
(3) In the above item (1) or (2), a plurality of engagement pieces having an upward hook-like engagement claw at the lower end are provided on the lower surface of the outer peripheral portion of the seat shell, and the engagement of each engagement piece. The seat shell is detachably fitted to the seat frame by elastically engaging the pawl with a locking hole provided in the inward support portion of the seat frame or an inner peripheral edge lower surface of the support portion.
[0012]
(4) In any one of the above items (1) to (3), an outward flange piece is connected to the upper ends of the left and right upward pieces of the seat frame, and both flange pieces are connected to the upper surfaces of the left and right support rods. The seat frame is provided between the left and right support rods.
[0013]
(5) In any one of the above items (1) to (4), a seat support member facing in the left-right direction is horizontally placed between the front and rear surfaces of the left and right support rods, and the rear end of the seat frame The lower surface of the seat and the lower surface of the front end of the seat shell are supported by the rear seat support member and the front seat support member, respectively, and screws are screwed into the seat shell from below the front and rear seat support members. Fix the frame and seat shell to the leg frame.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the frame (1) in the chair of the present invention, FIG. 2 is an exploded perspective view of the seat (2), and FIG. 3 is an enlarged side view of the central longitudinal section when the seat (2) is attached.
[0015]
The chair frame (1) faces in the left-right direction between a pair of left and right leg frames (3) (3) made of steel pipe and the front and rear facing surfaces of a horizontal support rod (3a) facing in the front-rear direction. The metal front seat support member (4) and the rear seat support member (5) fixed to each other and the upper ends of the front leg portions (3b) and (3b) facing the vertical direction of the leg frame (3) are fixed. The backrest (7) is attached between the upper end portions of the rear leg portions (3c) (3c) which are composed of the connecting rods (6) and face the vertical direction of the leg frame (3).
[0016]
The front seat support member (4) is substantially U-shaped in a side view with the central portion curved slightly downward, and through holes (8) are formed in both left and right ends thereof.
[0017]
The rear seat support member (5) has a horizontal support plate (5a) that is curved in an arc shape so that both left and right ends are fixed to the lower surface of the support rods (3a) and (3a) and the central portion bulges backward. And an upward support plate (5b) that rises in an arc shape slightly obliquely rearward and upward from the rear end edge, thereby forming a substantially L-shaped cross-sectional shape in side view, and left and right ends of the horizontal support plate (5a). A through hole (8a) is formed in the part, and a notch groove (9) having a U-shape in plan view is formed in the front end edge of the central part.
[0018]
The seat (2) includes a seat frame (10), a seat shell (11), a cushion material (12) such as foamed polyurethane, and a skin material (13) such as a cloth.
[0019]
The seat frame (10) is integrally formed of a hard synthetic resin into a substantially square frame shape with a large opening at the center, and the left and right side frames (10a) (10a) and the rear frame (10b) are inwardly supporting pieces (14). ) And the upward piece (15) form an inward L-shaped cross section.
[0020]
On the upper ends of the upward pieces (15) of the both side frames (10a) and the rear frame (10b), outward flange pieces (which can be placed on the upper surfaces of the support rods (3a) of the left and right leg frames (3), respectively. 16) (16) and the upper end of the rear seat support member (5) bent upward in a U-shape, facing obliquely rearward and upward in a size that can cover the front surface and upper end of the upward support plate (5b). The inclined flange piece (17) is integrally formed (see FIG. 3).
[0021]
The rear-side inward support piece (14) and the inclined flange piece (17) are curved in a rearward arc shape in substantially the same manner as the rear seat support member (5), and are formed at the left and right ends of the rear-side inward support piece (14). Is formed with a through hole (18) aligned with the through hole (8) when placed on the upper surface of the horizontal support plate (5a) of the rear seat support member (5).
[0022]
As shown in FIG. 4, the upper surface of the horizontal support plate (5a) of the rear seat support member (5) and the upward support plate are provided at the rear corners of the inclined flange piece (17) and the upward piece (15). A large number of rearward reinforcing ribs (19) that can contact the front surface of (5b) and have a vertical plate shape are formed.
[0023]
The front frame (10c) of the seat frame (10) is inclined obliquely forward and downward, and as shown in FIG. 3, is formed in a substantially upward U-shaped cross section when viewed from the side, and the outward flange piece (16) and The continuous front piece (20a) and the rear piece (20b) are reinforced by a plurality of ribs (21) joined between their opposing surfaces (see FIG. 4).
[0024]
An inward support portion is formed by the plurality of ribs (21) and the rear piece (20b), and a front frame piece (11b) described later is supported by the support portion. It is like that.
[0025]
A pair of left and right locking pieces (23) and (23) having a horizontal rectangular locking hole (22) are provided at an intermediate portion of the rear piece (20b) so as to protrude obliquely rearward and upward. (See FIG. 8).
[0026]
In addition, a locking protrusion (24) projects inwardly at an intermediate portion of the inward support piece (14) of the left and right side frames (10a).
[0027]
As shown in FIG. 5, the seat shell (11) has a generally rectangular shallow dish shape that is removably fitted into the frame of the seat frame (10), and the whole is integrally formed of synthetic resin. Yes.
[0028]
The vertical dimension of the frame-shaped piece (11a) facing the left and right and the rear part of the seat shell (11) is the vertical dimension of the upper piece (15) of the side frame (10a) and the rear frame (10b) of the seat frame (10). It is almost the same size as the dimensions.
[0029]
Further, the front end portion of the seat shell (11) is curved in an arc shape obliquely downward and forward, and the front end (20a) and the rear piece of the front frame (10c) of the seat frame (10) are arranged at the front end. A front frame piece (11b) in which the front end lower surface abuts on the upper end of the front piece (20a) between (20a) is connected in a diagonally upward direction (see FIG. 5).
[0030]
The cross-sectional shapes of the front frame piece (11) and the front end of the bottom plate (25) are generally L-shaped in side view.
[0031]
As shown in the bottom perspective views of FIGS. 6 and 7, a part of the upper surface of the bottom plate (25) is placed on the upper side of the seat shell (11) slightly behind the bottom plate (25) that curves slightly downward. Are bent downward so as to form a U-shaped cross-section, and the forward concave strips (26a) (26a) on both the left and right sides, which are slightly thinner than the thickness of the bottom plate (25), and the rear side A planar U-shaped flexible groove (26) comprising a horizontal groove (26b) is provided.
[0032]
The size of the central portion of the bottom plate (25) surrounded by the flexible recess (26) is slightly larger than the average size of the occupant's average buttocks. 27) is perforated to facilitate bending.
[0033]
As shown in FIGS. 6 and 7, the flexible recess (26) has a flexible recess on the rear portion of the forward recess (26 a) and the left and right sides of the lateral recess (26 b). A slit (28) facing in a direction orthogonal to the strip (26) is formed so as to make the strip (26) discontinuous. As shown in FIG. 5, each of the slits (28) penetrates to the upper surface of the bottom plate (25), and both ends thereof have an arc shape.
[0034]
As shown in FIG. 7 in an enlarged manner, by joining the adjacent ends of the flexible recess (26) divided by the slit (28) to both bases on the back side of each slit (28), A rib (29) that reinforces the portion is integrally projected so as to surround both ends of the slit (28).
[0035]
The front ends of the left and right forward concave strips (26a) open to the lower surface of the bottom plate (25), and slits (28) and (28) facing the left and right directions are also formed in the bottom plate (25) adjacent to the opening end. And the peripheral part of the back surface and the opening base part of the right and left of a forward concave line part (23a) are reinforced with the rib (30).
[0036]
As shown in FIG. 3 and FIG. 6, the lower surface of the front end portion of the bottom plate (25) of the seat shell (11) is fitted and positioned on the front and rear upper ends of the front seat support member (4) from above. A pair of front and rear ridges (31) and (31) project in the left-right direction.
[0037]
Mounting bosses (33) having through-holes (32) aligned with the through-holes (8) of the front seat support member (4) at the left and right ends between the ridges (31) on the lower surface of the bottom plate (25). ) (33) protrudes downward.
[0038]
As shown in FIG. 3, a tapping screw (34) inserted from below the front seat support member (4) is screwed into the through holes (32) of both mounting bosses (33), and the seat shell (11). The front end lower surface of the front end is fixed to the upper surface of the front seat support member (4).
[0039]
Mounting bosses (33) and (33) similar to the above are also provided on the left and right sides of the lower surface of the rear end of the bottom plate (25), and a rear seat is formed in the through hole (32) of the mounting boss (33). Tapping screws (34) and (34) (see FIG. 1) inserted from below into the through hole (8) of the support member (5) and the through hole (18) of the inward support piece (11) of the seat frame (10). The seat frame (10) and the seat shell (11) fitted to the seat frame (10) are both fixed to the rear seat support member (5).
[0040]
As shown in FIGS. 5, 6, and 8, on the lower surface of the center portion of the front end of the bottom plate (25) in the seat shell (11) A pair of left and right engagement pieces (35) and (35) having a projection 35a) are projected, and when the engagement claws (35a) are fitted to the seat frame (10), The front frame (10c) of the seat frame (10) is elastically engaged with a locking hole (22) formed in the locking piece (23) of the rear piece (20b).
[0041]
As shown in FIGS. 3, 4, and 9, an upward hook-like engagement claw is provided on the free end portion of the bottom plate (25) on the middle lower surface of the front and rear direction of the lower surface of both side portions and the central lower surface of the rear end portion. An engaging piece (36) having an outward J-shaped cross section is provided so as to protrude downward.
[0042]
The upper ends on the free end side of the left and right engaging pieces (36) are elastically deformed inward and pressed when the seat shell (11) is fitted into the seat frame (10). 10) is engaged with the lower surface of the locking protrusion (24) protruding from the left and right inward support pieces (14) (see FIG. 9).
[0043]
As shown in FIG. 3, the upper end on the free end side of the engagement piece (36) at the center of the rear end is elastically engaged with the lower surface of the inward support piece (14) on the rear side of the seat frame (10). It has become.
[0044]
In order to assemble the seat (2), first, the cushion material (12) is inserted into the frame of the seat shell (11) and placed, and the surface of the cushion material is covered with the skin material (11) as follows. cover.
[0045]
The peripheral part of the skin material (13) superimposed on the upper surface of the cushion material (12) was slightly folded back to the lower surface side of the seat shell (11), and then inserted into the bag-like edge (13a) of the skin material (13). The tightening string (37) is tightened and tensioned, and the surface of the cushion material (12) and the peripheral end of the seat shell (11) are wrapped and covered.
[0046]
Next, the seat shell (11) is fixed in the frame of the seat frame (10) as follows.
That is, first, the engaging claws (35a) of the pair of engaging pieces (35) provided on the lower surface of the front end portion of the bottom plate (25) of the seat shell (11) are connected to the front frame (10c) of the seat frame (10). After engaging the locking holes (22) of the pair of locking pieces (23) provided on the rear piece (20b), the entire seat shell (11) is pressed downward, and the left and right sides of the bottom plate (25) As described above, the three engagement pieces (36) provided at the front and rear end portions are elastically engaged with the lower surface of the locking projection piece (24) and the inward support piece (14) of the seat frame (10). Let
[0047]
Thus, the seat shell (11) is supported by the inward support pieces (14) of the seat frame (10) at the left and right side portions and the rear side lower surface of the bottom plate (25), and the front frame piece (11b). Is stably fixed in the frame of the seat frame (10) in a state where the lower surface is in contact with the upper surface of the front frame (10c) of the seat frame (10).
[0048]
At this time, the left and right sides of the skin material (13) folded back to the lower surface side of the seat shell (11) and the peripheral end portions on the rear side are inward support pieces (14) and upward pieces (15) of the seat frame (10). ) And the frame-shaped piece (11a) of the seat shell (11) and the lower surface of the bottom plate (25), and the front end of the front frame (10c) of the seat frame (10) is sandwiched between them. And the front frame piece (11b) of the seat shell (11), so that the sandwiching area of the entire peripheral edge of the skin material (13) is large, and the seat shell (11) is easily detached. There is no fear (see Figure 3).
[0049]
In order to attach the seat (2) thus assembled to the frame (1) of the chair, first, the left and right outwards of the seat frame (10) are placed on the upper surfaces of the support rods (3a) of the left and right leg frames (3). The flange piece (16) is placed, and the inward horizontal piece (14) on the rear side of the seat frame (10) is placed on the upper surface of the horizontal support plate (5a) of the rear seat support member (5). A reinforcing rib (19) is brought into contact with the front surface of the directional support plate (5b), and at the same time, a lower surface of the front end portion of the bottom plate (25) of the seat shell (11) attached to the seat frame (10) is provided thereon. Positioning is performed by the front and rear ridges (31) and (31), and they are placed on the upper end of the front seat support member (4).
[0050]
Next, the front and rear tapping screws (34) inserted from below the front and rear seat support members (4) and (5) are screwed together toward the mounting boss (33) of the seat shell (11).
[0051]
Thereby, the seat (2) is stably fixed to the upper part of the leg frame (3) so that the seat shell (11) and the cushion material (12) are positioned between the left and right support rods (3a). (See FIG. 3).
[0052]
Further, when the seat (2) is attached, the seat shell (11) is attracted to the seat frame (10) and strongly fixed by the front and rear tapping screws (34), so that the seat shell (11) is attached to the lower surface of the seat shell (11). The peripheral end portion of the folded skin material (13) is the inward support piece (14) of the seat frame (10), the lower surface of the bottom plate (25) of the seat shell (11), and the front frame of the seat frame (10) ( 10c) and the lower surface of the front frame piece (11b) of the seat shell (11) are strongly pinched.
[0053]
Therefore, even if the skin material (13) is strongly pulled in the front-rear and left-right directions, there is no fear that the peripheral end portion will be detached from or displaced from the seat shell (11).
[0054]
When seated on the seat (2) after the mounting, as shown in FIG. 10 (the cushion material and the skin material are not shown), the central portion of the bottom plate (25) of the seat shell (11) is a flexible groove (26 ) Around the opening of the seat frame (10).
[0055]
That is, when the load of the seated person's buttocks is applied to the central portion of the bottom plate (25) surrounded by the flexible recess (26), the thin flexible recess (26) becomes 2 in FIG. By elastically deforming in the expanding direction as indicated by a dotted line, the center portion of the bottom plate (25) is bent in an arc shape so as to sink downward.
[0056]
In addition, since the flexible recess (26) is provided with a plurality of slits (28) and is discontinuous, its flexural rigidity is reduced and the flexibility of the central portion of the bottom plate (25) is large. As a result, sitting comfort is improved.
[0057]
Since the base of the slit (28) is reinforced by the rib (30), even if the central portion of the bottom plate (25) is repeatedly greatly bent, the base plate (25) is cracked from the base of the slit (28). There is no fear of generating.
[0058]
Since a large number of small holes (27) are formed in the central portion of the bottom plate (25), the portions can be easily bent along the heel portion, and the sitting comfort is further improved.
[0059]
Side-view substantially L-shaped cross section comprising a horizontal support plate (5a) and an upward support plate (5a) standing up rearward between the rear ends of the horizontal rods (3a) in the left and right leg frames (3) The rear seat support member (5) having high rigidity is provided on the lower surface and the front surface thereof, and on the rear surface of the upward frame (15) and the inclined flange piece (17) of the rear frame (10b) of the seat frame (10). Since the rear end and the lower surface of the large number of reinforcing ribs (19) are in contact with each other, the rear frame (10b) of the seat frame (10), that is, the seat frame (10), the seat shell (11), and the cushion material The support area of the rear end portion of the seat (2) made of (12) and the skin material (13) increases, the load at the time of sitting is dispersed, and the surface pressure decreases.
[0060]
As a result, the bending deformation of the rear portion of the seat frame (10) is reduced, the rear portion of the seat (2) is stably supported, and the support strength is also increased.
[0061]
Moreover, since the lower surface and the rear surface of the rear frame (10b) are covered with the metal rear seat support member (5), a large number of chairs having the same shape are stacked with the rear seat support member (5) facing downward. When storing and storing, the lower surface and the rear surface of the rear frame (10b) are protected and are prevented from being scratched.
[0062]
Moreover, even if the load of many stacked chairs acts as an upward reaction force on the rear seat support member (5) of the lowermost chair and the inclined flange piece (17) of the seat frame (10), many reinforcements Since the rib (19) is provided, there is no possibility that a problem such as a large bending upward and breakage occurs.
[0063]
In the above embodiment, the seat shell (11) has the frame-shaped piece (11a). However, when the seat shell (11) is relatively thick and has a large flexural rigidity, the frame-shaped piece (11a) is used. ) May be omitted to form a flat plate, or the left and right side parts or the rear part may be omitted.
[0064]
Three engagement pieces (36) on the lower surface of the seat shell (11) are connected to the lower surface of the engagement piece (24) of the inward support piece (14) in the seat frame (10) and the inward support piece (14). Although it is elastically engaged with the lower surface of the inner peripheral edge, an engagement hole is formed in the inward support piece (14), and each engagement piece (36) is elastically engaged with this engagement hole. Good.
[0065]
【The invention's effect】
According to the first aspect of the present invention, when the seat shell is fitted to the seat frame, the peripheral portion of the skin material folded back on the lower surface of the seat shell is sandwiched from above and below to be easily and firmly fixed. The Therefore, there is no possibility that the skin material will come off or shift without using a conventional adhesive.
[0066]
In addition, since the peripheral end of the seat shell is supported by a rigid frame-like seat frame having upward pieces on the left and right side frames and the rear frame, the seat shell is made relatively thin, etc. The flexibility of the central part at the time of the seating can be increased, and the sitting comfort of the seat is improved.
[0067]
According to the second aspect of the present invention, the rigidity of the peripheral end portion of the seat shell is increased and the sandwiching area of the peripheral end portion of the skin material is increased, so that the skin material is more firmly fixed.
[0068]
According to the third aspect of the present invention, the seat shell can be easily fixed simply by being pushed into the seat frame, and can be easily detached, so that the skin material can be easily replaced.
[0069]
According to the invention of claim 4, the seat frame and the seat shell and the cushion material fitted to the seat frame can be provided between the left and right support rods while preventing the displacement in the left-right direction. Since the upper surface of the support rod is covered with the flange piece, the appearance is improved.
Further, the rigidity of the left and right side frames of the seat frame is further increased by providing the flange pieces.
[0070]
According to the fifth aspect of the present invention, the seat frame and the seat shell can be stably supported by the front and rear seat support members without impairing the flexibility of the central portion of the seat shell.
In addition, by screwing the screw into the seat shell from below the front and rear seat support members, the lower surface of the outer peripheral portion of the seat shell comes into strong contact with the upper surface of the inward support portion of the seat frame, and the skin material sandwiched between them When the peripheral end portion of this is strongly clamped, the fixing strength is further increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of a chair frame of the present invention.
FIG. 2 is an exploded perspective view of the seat.
FIG. 3 is an enlarged side view of a longitudinal section of a seat portion in the same manner.
FIG. 4 is a rear perspective view of the seat frame.
FIG. 5 is also a plan view of a seat shown with a cushion material removed.
FIG. 6 is a perspective view of the lower surface of the seat shell.
7 is an enlarged view of a part A in FIG. 6;
8 is an enlarged longitudinal sectional side view taken along line VIII-VIII in FIG.
9 is an enlarged longitudinal sectional view taken along line IX-IX in FIG.
10 is an enlarged vertical sectional view taken along line XX of FIG.
[Explanation of symbols]
(1) Frame (2) Seat (3) Leg frame (3a) Support rod (3b) Front leg (3c) Rear leg (4) Front seat support member (5) Rear seat support member (5a) Horizontal support plate (5b) Upward support plate (6) Connecting rod (7) Backrest (8) Through hole (9) Notch groove (10) Seat frame (10a) Side frame (10b) Rear frame (10c) Front frame (11 ) Seat shell (11a) Frame piece (11b) Front frame piece (12) Cushion material (13) Skin material (13a) Bag-shaped edge (14) Inward support piece (inward support part)
(15) Upward piece (16) Outward flange piece (17) Inclined flange piece (18) Through hole (19) Reinforcement rib (20a) Front piece (20b) Rear piece (21) Rib (22) Locking hole (23 ) Locking piece (24) Locking protrusion (25) Bottom plate (26) Flexible groove (26a) Forward groove (26b) Lateral groove (27) Small hole (28) Slit (29) (30) Rib (31) Projection (32) Through hole (33) Mounting boss (34) Tapping screw (screw)
(35) engagement piece (35a) engagement claw (36) engagement piece (37) tightening string

Claims

An upper end of a leg frame having a pair of left and right support rods facing in the front-rear direction at the upper end has a frame shape having an inward support portion, and at least the left and right side frames and the rear frame have outer peripheral ends of the support portions. A synthetic resin seat frame having an upward piece standing more upright, and a cushion material covered with a skin material on the upper surface in a frame surrounded by the upward piece in the seat frame; and The peripheral edge of the skin material, which is a plate-like seat shell made of a synthetic resin that can be elastically deformed downward in the center, is folded back onto the lower surface, the upper surface of the inward support portion of the seat frame, and the outer periphery of the seat shell. A chair characterized by being fitted so as to be held between the lower surfaces of the parts.

The chair according to claim 1, wherein frame-like pieces that are slidably in contact with the inner surface of the upward piece of the seat frame are provided upright on both the left and right ends and the rear end of the seat shell.

A plurality of engagement pieces having an upward hook-like engagement claw at the lower end project from the lower surface of the outer periphery of the seat shell, and the engagement claw of each engagement piece is provided on the inward support portion of the seat frame. The chair according to claim 1 or 2, wherein the seat shell is detachably fitted to the seat frame by elastically engaging the locking hole or the lower surface of the inner peripheral edge of the support portion.

The seat frame is provided between the left and right support rods by connecting outward flange pieces to the upper ends of the left and right upward pieces of the seat frame, and supporting both flange pieces on the upper surfaces of the left and right support rods. The chair according to any one of claims 1 to 3.

A seat support member facing in the left-right direction is horizontally mounted between the front and rear opposing surfaces of the left and right support rods, and the rear seat lower surface and the front end lower surface of the seat shell are respectively connected to the rear seat. The seat frame and the seat shell are fixed to the leg frame by screws supported by the support member and the front seat support member and screwed into the seat shell from below the front and rear seat support members. A chair according to any one.