JP2004057398A - Headrest device for chair - Google Patents

Headrest device for chair Download PDF

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Publication number
JP2004057398A
JP2004057398A JP2002218720A JP2002218720A JP2004057398A JP 2004057398 A JP2004057398 A JP 2004057398A JP 2002218720 A JP2002218720 A JP 2002218720A JP 2002218720 A JP2002218720 A JP 2002218720A JP 2004057398 A JP2004057398 A JP 2004057398A
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Japan
Prior art keywords
headrest
support
support cylinder
rod
opening
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JP2002218720A
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JP4149758B2 (en
Inventor
Naoki Numa
沼 直樹
Ryo Igarashi
五十嵐 僚
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Okamura Corp
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Okamura Corp
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  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Seats For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device for a chair of which the operation and the structure are simple, of which the workability for assembly and disassembly is good, and which can stably support a headrest. <P>SOLUTION: This headrest device for a chair has a pillow supporting rod 10 erected from an upper part of a backrest to support the headrest 11 by the upper end part, and the rod 10 comprises a supporting cylinder 13 directed upward from the top of the backrest and having an opening provided in a side face, a vertically movable rod 16 freely slidably fitted in the supporting cylinder 13 from the top, and having a headrest supporting part 14 formed at the top end and provided with a plurality of grooves in a multiple of stages on a side surface opposite to an opening 12, and a closing member 18 having an elastically deformable protrusion 17 detachably provided on a side face of the cylinder 13 to close the opening 12 and elastically and selectively engaged with the grooves 15 of the rod 16 to hold the rod 16 at a desired height. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、椅子のヘッドレスト装置、特にそのヘッドレストの高さ調節装置に関する。
【0002】
【従来の技術】
従来のヘッドレストの高さ調節装置としては、例えば、特開2001−314268号公報に記載されているように、背凭れから上方に向かって延出する左右1対の縦杆(枕支持杆)に複数の凹部を長手方向に所要の間隔をもって設け、かつヘッドレストに設けた爪を上記凹部のいずれかに係合することにより、ヘッドレストを所望の高さに保持するようにしたものや、それと上下逆の構造となるように、ヘッドレストから垂下する左右1対の縦杆(枕支持杆)に複数の凹部を長手方向に所要の間隔をもって設け、かつ背凭れに設けた爪を上記凹部のいずれかに係合することにより、ヘッドレストを所望の高さに保持するようにしたもの等がある。
また、ヘッドレストを上方に一段ずつ引き上げることができるが、途中からは下降させることができず、一旦予め定めた上限に達した後、始めて下限まで下降させることができるようにしたものもある。
【0003】
【発明が解決しようとする課題】
しかし、上述の前者の爪を用いるものでは、ヘッドレストの高さ調節をする度に、爪を凹部から離脱させる作業を行わなければならず、操作が面倒であり、また、後者は、構造が複雑で高価になる等の問題がある。
【0004】
本発明は、従来の技術が有する上記のような問題点に鑑み、操作及び構造が簡単であるとともに、組み付け及び分解の作業性がよく、しかもヘッドレストを安定して支持することができるとともに、ヘッドレストを円滑に上下動させることができるようにした椅子のヘッドレスト装置を提供することを目的としている。
【0005】
【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) 背凭れの上部より起立し、かつ上端部でヘッドレストを支持するようにした枕支持杆を、下端部が背凭れの上部に取り付けられ、ほぼ上方を向くとともに、側面に開口が設けられた支持筒と、この支持筒内に上方より摺動自在に嵌合され、かつ上端部にヘッドレスト支持部が形成されるとともに、前記開口に対向する面に、複数の被係合部が上下多段状に設けられた昇降杆と、前記開口を閉塞するように前記支持筒の側面に着脱自在に設けられ、かつ前記昇降杆の複数の被係合部に選択的に弾性係合することにより、前記昇降杆を所望の高さに保持しうる弾性変形可能な係合部を有する閉塞部材とにより構成する。
【0006】
(2) 上記(1)項において、支持筒の後部の横断面を、前方に向かって拡開する平面視V字状とするとともに、昇降杆の後面を、前記支持筒の後部の前面に補形をなす形状とする。
【0007】
(3) 上記(1)または(2)項において、昇降杆の下部に、内方に向けて弾性変形可能な外向き係合爪を設け、支持筒の内面に、前記外向き係合爪が嵌合し、かつ上端が支持筒の上端より下方の位置で終端する上下方向を向く溝条を設け、前記外向き係合爪が前記溝条の上端に係合することにより、昇降杆を支持筒から抜け止めしうるようにする。
【0008】
(4) 上記(1)〜(3)項のいずれかにおいて、外向き係合爪を、昇降杆の後面ほぼ中央に設けるとともに、溝条を、支持筒の後部の前面ほぼ中央に設ける。
【0009】
(5) 上記(1)〜(4)項のいずれかにおいて、閉塞部材に、互いに平行な2条のスリットを設けることにより、両スリット間に可撓片を形成し、この可撓片に係合部を設ける。
【0010】
(6) 上記(1)〜(5)項のいずれかにおいて、閉塞部材の下端部を、支持筒における開口の下縁部の内側に係合し、かつ閉塞部材の上端部を、支持筒における開口の上縁部にねじ止めする。
【0011】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面を参照して説明する。
図1〜図11は、本発明の一実施形態を備える椅子を示す。
【0012】
図1〜図3に示すように、この椅子は、脚(1)によって支持された支基(2)に、座(3)と背凭れ(4)とが互いに連動して後傾し得るようにして装着されている。
【0013】
背凭れ(4)は、前方を向く水平部(6a)(6a)の前端部が支基(2)に左右方向を向く軸(5)をもって枢着された側面視L字状をなす左右1対の背凭れ支持杆(6)(6)と、この背凭れ支持杆(6)(6)における水平部(6a)(6a)の後端から起立する起立部(6b)(6b)の上端同士を連結する左右方向を向く上部フレーム(7)と、両背凭れ支持杆(6)(6)における起立部の上部と下部との4個所に取り付けられ、着座者の背を直接受けるネット材よりなる背当部材(8)とからなっている。
【0014】
なお、背凭れ(4)を、背凭れ支持杆(6)(6)と上部フレーム(7)とが、厚肉の背当部材(8)内に一体的に埋設されたものとしてもよい。
【0015】
この実施形態では、背凭れ(4)における上部フレーム(7)に、ヘッドレスト装置(9)が取り付けられている。
ヘッドレスト装置(9)は、下端部が上部フレーム(7)に左右方向を向く軸回りに角度調節可能として枢着され、かつ長手方向に伸縮可能としたほぼ上下方向を向く枕支持杆(10)の上端部に、ヘッドレスト(11)を、左右方向を向く軸回りに角度調節可能として枢着したものよりなっている。
【0016】
図4〜図8に示すように、枕支持杆(10)は、下端部が上部フレーム(7)に枢着され、ほぼ上方を向くとともに、前面(側面)に縦長方形の開口(12)が設けられた平面視ほぼ三角形状の支持筒(13)と、この支持筒(13)内に上方より摺動自在に嵌合され、かつ上端部にヘッドレスト支持部(14)が形成されるとともに、上記開口(12)に対向する面に、被係合部である左右方向を向く複数の凹溝(15)が上下多段状に設けられた昇降杆(16)と、上記開口(12)を閉塞するように支持筒(13)の前面に着脱自在に設けられ、かつ昇降杆(16)の複数の凹溝(15)に選択的に弾性係合することにより、昇降杆(16)を所望の高さに保持しうる弾性変形可能な係合部である左右方向を向く丸棒状の突条(17)を有する閉塞部材(18)とを備えている。
【0017】
支持筒(13)の下端部は、左右方向に逆V字状の二股状をなして分岐し、両分岐部(19)(19)の下端部には、左右方向を向く筒部(20)(20)がそれぞれ設けられている。
【0018】
各筒部(20)は、上部フレーム(7)に止めねじ(21)をもって固着された左右1対の支持部材(支持部)(22)(22)の内側面に、左右方向を向く軸(23)をもって枢着されている。
【0019】
図4に示すように、この軸(23)は、拡径鍔部(24)の両側に、雄ねじ部(25)(26)を有し、かつ長い方の雄ねじ部(26)の基部の外周面にスパナ掛け用の1対の平削面(27)が形成された鍔付ボルトにより形成されている。
【0020】
一方の雄ねじ部(25)は、支持部材(22)を貫通して、その先端部に螺合する袋ナット(28)を締付けることにより、支持部材(22)に、他方の雄ねじ部(26)が互いに内方を向くようにして、固着されている。
【0021】
他方の雄ねじ部(26)には、左右の筒部(20)の内面における中間部に設けられた内向き鍔部(29)の中央孔(30)が挿通されるとともに、拡径鍔部(24)と内向き鍔部(29)との間、及び内向き鍔部(29)と、雄ねじ部(26)に螺合した締め付け手段をなす袋ナット(31)との間に、弾性体である1個または複数個の皿ばね(32)と1個または複数個の摩擦板(33)とからなる抵抗力付与手段(34)をそれぞれ介在させて、袋ナット(31)を締め付けることにより、支持筒(13)の軸(23)まわりの回動に所要の抵抗力を付与しうるようになっている。この抵抗力は、袋ナット(31)の締め付け量を調節することにより、調節することができる。
【0022】
なお、図4に示す例では、筒部(20)の内向き鍔部(29)より外側の抵抗力付与手段(34)は、1個の皿ばね(32)と3個の摩擦板(33)とからなるものとし、また、内向き鍔部(29)より内側の抵抗力付与手段(34)は、2個の皿ばね(32)と2個の摩擦板(33)とからなるものとしてある。
【0023】
各支持部材(22)の内側面における偏心部には、軸(23)と平行に突出する側面視円弧状の凸部(35)が一体的に形成されており、それに対向する筒部(20)の外端面には、円周方向の長さを凸部(35)の同方向の長さより大とした円弧状の凹部(36)が設けられ、凹部(36)に凸部(35)を嵌合することにより、支持筒(13)における軸(23)まわりの回動角度を、所要の範囲に規制しうるようにしてある。
【0024】
なお、凸部(35)を筒部(20)側に設け、かつ凹部(36)を支持部材(22)側に設けてもよい。
【0025】
図5〜図8に示すように、支持筒(13)の横断面形状は、後部中央に、前方に向かって90°の挾角をもって平面視V字状に拡開する頂角部を配設した直角二等辺三角形状とし、それに対向する昇降杆(16)の後面を、支持筒(13)の後部の前面にほぼ補形をなす形状とすることにより、昇降杆(16)が支持筒(13)内を、ねじれが生じることなく、常に円滑に上下動しうるようにしてある。
【0026】
支持筒(13)における後部中央の前面には、下端から上端よりやや下方の位置まで至る上下方向を向く溝条(37)が設けられており、それに対応する昇降杆(16)の下端後部には、常時は上記溝条(37)内に嵌合し、昇降杆(16)を予め定めた位置まで上昇させたとき、溝条(37)の上端に係合して、昇降杆(16)のそれ以上の上昇を阻止するようにした外向きの係合爪(38)が設けられている。
【0027】
この係合爪(38)を、昇降杆(16)の内方に向けて弾性変形可能なように、昇降杆(16)と一体的に形成することにより、これを内方に弾性変形させて、昇降杆(16)を支持筒(13)から上方に抜き出したり、または逆に差し込んだりすることができる。
【0028】
昇降杆(16)を支持筒(13)から抜き出す際には、開口(12)から閉塞部材(18)を外し、開口(12)に指を挿入して、溝条(37)の上端に係合している係合爪を、内方に弾性撓曲させて、容易に係合を解除させることができる。
【0029】
閉塞部材(18)は、縦長の方形板状をなし、その下端部を、支持筒(13)の前面における開口(12)の下縁部の内側に挿入し、かつ上端部に設けたボス部(39)を、支持筒(13)の前面における開口(12)の上部に突設した突軸(40)に嵌合し、かつ突軸(40)の前端に止着した止めねじ(41)の頭部(41a)で、ボス部(39)を突軸(40)から抜け止めし、さらに、中位部の両側より後方に向けて延設した左右1対の外向き係止爪(42)を、支持筒(13)における開口(12)の中位部両側面に設けた係合溝(43)に嵌合係止することにより、支持筒(13)の前面に、開口(12)を閉塞するようにして取り付けられている。
【0030】
閉塞部材(18)の中央部には、上下方向を向く互いに平行な2条のスリット(44)(44)が設けられ、両スリット(44)(44)間に可撓片(45)が形成されている。
【0031】
可撓片(45)の上端部には、薄肉とした易撓曲片(46)が設けられ、その直下の可撓片(45)の上部後面に、上述の横向き丸棒状の突条(17)が後方に向かって突出するようにして設けられている。
【0032】
この可撓片(45)が前方に弾性撓曲することにより、突条(17)が、昇降杆(16)の複数の凹溝(15)に選択的に弾性係合して、昇降杆(16)を段階的な所望の高さに保持することができるのである。
【0033】
図5及び図9〜図11に示すように、昇降杆(16)の上端部は、弾性を有する合成樹脂材料により、左右方向に開きかつ前方を向く二股V字状に形成し、各分岐部(47)の前端には、短寸の横向き軸部(48)と、その前面中央に突設した有頭軸(49)とからなるヘッドレスト支持部(14)がそれぞれ形成されている。
【0034】
横向き軸部(48)の前面は、前方に向かって突出する側面視凸形円弧状の枕受け面(48a)をなしている。
【0035】
有頭軸(49)は、この枕受け面(48a)の法線の方向を向くようにして突設された軸部(49a)と、その前端に設けられた円板状の拡幅頭部(49b)と、この拡幅頭部(49b)の左右両側部の後面に設けられた半球状、または左右方向を向く半円柱状の突起(49c)とを備えている。なお、この例では、拡幅頭部(49b)は円板状としてあるが、左右方向に長い方形板状またはその他の形状としてもよい。
【0036】
ヘッドレスト(11)は、ほぼ倒立二等辺三角形状の後部シェル(50)の前面に、クッション材(51)と表装材(52)とを前面に張着したほぼ同形の前部シェル(53)を、着脱自在に取り付けたものよりなり、後部シェル(50)の後面には、枕受け面(48a)とほぼ同一曲率の側面視凹型円弧状の左右1対の嵌合面(54)(54)と、各嵌合面(54)内において有頭軸(49)の軸部(49a)が挿通しうるようにした上下方向を向く左右1対の長孔(55)と、各長孔(55)の対向縁の中間部(または上下の端部)に、狭幅部(56)を介して、互いに内方を向くように連設された拡大孔(57)とが設けられている。
【0037】
左右の長孔(55)(55)間の間隔は、外力を加えないときの左右の有頭軸(49)(49)間の間隔と同一とし、また各拡大孔(57)の位置と大きさとは、昇降杆(16)の上端部における左右の分岐部(47)(47)を互いに内方へ向かって弾性撓曲させることにより、左右の有頭軸(49)の拡幅頭部(49b)を、対応する拡大孔(57)に同時に、または1個を先に挿入して、その軸部(49a)を狭幅部(56)を通じて長孔(55)内に位置させた後、他方を挿入するように、順次に挿入しうるような関係としてある。
【0038】
したがって、左右の拡大孔(57)(57)を利用して、左右の有頭軸(49)(49)の軸部(49a)(49a)を、その前端の拡幅頭部(49b)(49b)が後部シェル(50)の前方に位置するようにして、後部シェル(50)の左右の長孔(55)(55)内に嵌合し、かつ左右の後部シェル(50)の左右の嵌合面(54)(54)を、左右の枕受け面(48a)(48a)に嵌合して、後部シェル(50)及びそれと一体のヘッドレスト(11)全体を、昇降杆(16)の上端部のヘッドレスト支持部(14)に、横向き軸部(48)(48)を中心として上下方向に首振り可能として簡単に装着することができる。
【0039】
有頭軸(49)の拡幅頭部(49b)の両側部と、後部シェル(50)の前面との間には、枕受け面(48a)とほぼ同一の曲率中心の円弧状をなし、かつ上下の端部が、後部シェル(50)の前面に突設した上下の突片(58)(59)の内側に係止され、中間部が前後方向に弾性撓曲しうるようにした合成樹脂製の板ばね材(60)が配設されている。
【0040】
板ばね材(60)は、正面視縦長方形をなし、中央には、上端が開口するとともに、有頭軸(49)の軸部(49a)が挿通するようにした上下方向を向くスリット(61)が形成されている。
【0041】
板ばね材(60)におけるスリット(61)の両側方の前面には、有頭軸(49)における拡幅頭部(49b)の後面両側部に設けられた突起(49c)が選択的に弾性係合しうるようにした複数の左右方向を向く凹条(凹部)(62)が、上下方向にわずかの間隔をもって連続して設けられ、板ばね材(60)の前面は、図11に示すように、上下方向に連続する側面視波形面となっている。
【0042】
この波形面に、有頭軸(49)における各突起(49c)が圧接することにより、ヘッドレスト(11)を横向き軸(48)を中心として上下方向に回動させる際に、各突起(49c)が上下に隣接する凹条(62)に一段ずつ歩進的に弾性係合し、ヘッドレスト(11)の回動操作に節度感のある抵抗力を付与することができる。
【0043】
すなわち、この例では、有頭軸(49)における突起(49c)と板ばね材(60)とにより、枕支持杆(10)に対するヘッドレスト(11)の回動に抵抗力を付与する抵抗力付与手段が形成されている。
【0044】
この実施形態によると、解除レバー等を操作することなく、枕支持杆(10)を前後方向に起倒させたり、ヘッドレスト(11)を枕支持杆(10)に対して回動させたりして、ヘッドレスト(11)の位置と向きとを、着座者の体型や着座姿勢に応じて、適時に簡単に最適な状態にすることができる。
【0045】
【発明の効果】
請求項1記載の発明によると、係合部と被係合部との弾性係合力に抗して、ヘッドレストを昇降させるだけで、ヘッドレストを簡単に高さ調節することができるとともに、支持筒に昇降杆を差し込んだ後、支持筒の開口に閉塞部材を取り付けることにより、簡単に組み付けることができ、それと逆の順序で簡単に分解することができる。
また、支持筒と昇降杆と閉塞部材とにより、ヘッドレストの高さ調節装置が形成されるので、細かい部品が多い従来の高さ調節装置に比して、構造が簡単で、容易に製造できる。
【0046】
請求項2記載の発明によると、平面視V字状とした支持筒の後部の前面に、それと補形をなす昇降杆の後面が摺接することにより、昇降杆は、支持筒内を、捩じれが生じることなく、常に円滑に上下動することができる。
【0047】
請求項3記載の発明によると、外向き係合爪が溝条の上端に係合することにより、昇降杆を支持筒から確実に抜け止めすることができ、昇降杆がむやみに支持筒から外れるのを防止することができる。
【0048】
請求項4記載の発明によると、昇降杆における外向き係合爪の両側方の後面が、平面視V字状とした支持筒の後部の前面に摺接して、円滑に案内されるので、外向き係合爪に、昇降杆の軸線回りの捩じれ力その他の外力が作用することがなく、また外向き係合爪が溝条にスティック現象を起こしたり、昇降の妨げとなったりすることがなく、好都合である。
【0049】
請求項5記載の発明によると、閉塞部材に、互いに平行な2条のスリットを設けることにより、両スリット間に可撓片を形成し、この可撓片により係合部に適度の弾性力を付与することができる。
【0050】
請求項6記載の発明によると、閉塞部材を、簡単かつ確実に支持筒に取り付けることができるとともに、容易に取り外すこともできる。
【図面の簡単な説明】
【図1】本発明の一実施形態を備える椅子の正面図である。
【図2】同じく、側面図である。
【図3】同じく、平面図である。
【図4】図1のIV−IV線に沿う横断平面図である。
【図5】図3のV−V線に沿う拡大縦断側面図である。
【図6】図5のVI−VI線に沿う断面図である。
【図7】図5のVII−VII線に沿う断面図である。
【図8】図5のVIII−VIII線に沿う縦断正面図である。
【図9】図5のIX−IX線に沿う横断平面図である。
【図10】図9のX−X線に沿う縦断正面図である。
【図11】図9のXI−XI線に沿う縦断側面図である。
【符号の説明】
(1)脚
(2)支基
(3)座
(4)背凭れ
(5)軸
(6)支持杆
(6a)水平部
(6b)起立部
(7)上部フレーム
(8)背当部材
(9)ヘッドレスト装置
(10)枕支持杆
(11)ヘッドレスト
(12)開口
(13)支持筒
(14)ヘッドレスト支持部
(15)凹溝(被係合部)
(16)昇降杆
(17)突条(係合部)
(18)閉塞部材
(19)分岐部
(20)筒部
(21)止めねじ
(22)支持部材(支持部)
(23)軸
(24)拡径鍔部
(25)(26)雄ねじ部
(27)平削面
(28)袋ナット
(29)内向き鍔部
(30)中央孔
(31)袋ナット(締め付け手段)
(32)皿ばね
(33)摩擦板
(34)抵抗力付与手段
(35)凸部
(36)凹部
(37)溝条
(38)係合爪
(39)ボス部
(40)突軸
(41)止めねじ
(41a)頭部
(42)外向き係止爪
(43)係合溝
(44)スリット
(45)可撓片
(46)易撓曲片
(47)分岐部
(48)横向き軸部
(48a)枕受け面
(49)有頭軸
(49a)軸部
(49b)拡幅頭部
(49c)突起
(50)後部シェル
(51)クッション材
(52)表装材
(53)前部シェル
(54)嵌合面
(55)長孔
(56)狭幅部
(57)拡大孔
(58)(59)突片
(60)板ばね材
(61)スリット
(62)凹条(凹部)
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chair headrest device, and more particularly to a headrest height adjustment device.
[0002]
[Prior art]
As a conventional headrest height adjusting device, for example, as described in Japanese Patent Application Laid-Open No. 2001-314268, a pair of right and left vertical bars (pillow support bars) extending upward from a backrest is disclosed. A plurality of recesses are provided at required intervals in the longitudinal direction, and a claw provided on the headrest is engaged with any of the recesses to hold the headrest at a desired height, or upside down. A plurality of recesses are provided at a required interval in the longitudinal direction on a pair of right and left vertical rods (pillow support rods) that hang down from the headrest, and the claw provided on the backrest is inserted into one of the recesses. There is one that engages to hold the headrest at a desired height.
In some cases, the headrest can be lifted upward by one step, but cannot be lowered halfway, but can be lowered to the lower limit for the first time after reaching a predetermined upper limit.
[0003]
[Problems to be solved by the invention]
However, in the case of using the former claw described above, every time the height of the headrest is adjusted, the work of detaching the claw from the concave portion must be performed, and the operation is troublesome, and the latter has a complicated structure. And it is expensive.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has a simple operation and structure, has good workability in assembling and disassembling, and can stably support a headrest. It is an object of the present invention to provide a headrest device for a chair in which the chair can be moved up and down smoothly.
[0005]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) A pillow support rod rising from the upper portion of the backrest and supporting the headrest at the upper end portion is attached to the upper portion of the backrest at the lower end portion, and is directed substantially upward, and an opening is provided on a side surface. And a headrest support portion is formed at an upper end portion of the support tube, and a plurality of engaged portions are vertically multi-staged on a surface facing the opening. The lifting rod provided in a shape, is provided detachably on the side surface of the support cylinder so as to close the opening, and selectively elastically engages with a plurality of engaged portions of the lifting rod, A closing member having an elastically deformable engaging portion capable of holding the lifting rod at a desired height.
[0006]
(2) In the above item (1), the cross section of the rear part of the support cylinder is V-shaped in plan view expanding toward the front, and the rear surface of the elevating rod is supplemented to the front surface of the rear part of the support cylinder. A shape that forms a shape.
[0007]
(3) In the above item (1) or (2), an outward engaging claw that is elastically deformable inward is provided at a lower portion of the elevating rod, and the outward engaging claw is provided on an inner surface of the support cylinder. A vertically extending groove that fits and whose upper end terminates at a position below the upper end of the support cylinder is provided, and the outward engaging claw is engaged with the upper end of the groove to support the lifting rod. So that it can be removed from the tube.
[0008]
(4) In any one of the above items (1) to (3), the outward engagement claw is provided substantially at the center of the rear surface of the elevating rod, and the groove is provided substantially at the center of the front surface of the rear portion of the support cylinder.
[0009]
(5) In any one of the above items (1) to (4), by providing two parallel slits in the closing member, a flexible piece is formed between both slits, and the flexible piece is engaged. A joint is provided.
[0010]
(6) In any one of the above items (1) to (5), the lower end of the closing member is engaged with the inside of the lower edge of the opening in the support tube, and the upper end of the closing member is connected to the support tube. Screw it to the upper edge of the opening.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 11 show a chair provided with an embodiment of the present invention.
[0012]
As shown in FIGS. 1 to 3, this chair has a support (2) supported by a leg (1) such that a seat (3) and a backrest (4) can lean backward in conjunction with each other. It is attached to.
[0013]
The backrest (4) has an L-shape in a lateral view, in which the front ends of horizontal parts (6a) (6a) facing forward are pivotally attached to a support base (2) with a shaft (5) facing leftward and rightward. A pair of backrest supporting rods (6) and (6) and upper ends of the upright parts (6b) and (6b) standing from the rear ends of the horizontal parts (6a) and (6a) of the backrest supporting rods (6) and (6). A net member which is attached to four portions, that is, an upper frame (7) facing left and right, which connects them, and upper and lower portions of an upright portion of both backrest supporting rods (6), (6), and which directly receives the back of a seated person. And a backrest member (8).
[0014]
The backrest (4) may be configured such that the backrest support rods (6) and (6) and the upper frame (7) are integrally embedded in a thick backrest member (8).
[0015]
In this embodiment, a headrest device (9) is attached to the upper frame (7) of the backrest (4).
The headrest device (9) has a lower end pivotally attached to the upper frame (7) so as to be adjustable in angle about an axis extending in the left-right direction, and is capable of extending and contracting in the longitudinal direction, and is provided with a pillow support rod (10) that is oriented substantially vertically. A headrest (11) is pivotally connected to the upper end of the headrest so that the angle of the headrest (11) can be adjusted around an axis extending in the left-right direction.
[0016]
As shown in FIGS. 4 to 8, the lower end of the pillow support rod (10) is pivotally attached to the upper frame (7), faces substantially upward, and has a vertical rectangular opening (12) in the front (side). A substantially triangular support tube (13) provided in plan view is provided, and a headrest support portion (14) is formed at the upper end of the support tube (13) so as to be slidably fitted from above and A lift rod (16) having a plurality of grooves (15) directed in the left-right direction, which are engaged portions, provided on a surface facing the opening (12) in a vertically multistage manner, and the opening (12) is closed. The lifting rod (16) is detachably provided on the front surface of the support tube (13) so as to selectively engage with the plurality of concave grooves (15) of the lifting rod (16) so that the lifting rod (16) can be moved to a desired position. A round bar-shaped ridge (17) that is an elastically deformable engaging portion that can be held at a height and that faces in the left-right direction. And a closing member (18) having.
[0017]
The lower end of the support tube (13) branches in an inverted V-shaped bifurcated shape in the left-right direction, and the lower ends of both branch portions (19) and (19) have tubular portions (20) pointing in the left-right direction. (20) are provided.
[0018]
Each cylindrical portion (20) has a pair of left and right supporting members (supporting portions) (22) (22) fixed to the upper frame (7) with set screws (21). 23).
[0019]
As shown in FIG. 4, this shaft (23) has external thread portions (25) and (26) on both sides of the enlarged diameter flange portion (24), and the outer periphery of the base of the longer external thread portion (26). The surface is formed by a flanged bolt having a pair of planed surfaces (27) for hanging a wrench.
[0020]
One male screw portion (25) penetrates the support member (22) and tightens a cap nut (28) that is screwed to the tip of the support member (22), so that the other male screw portion (26) is attached to the support member (22). Are fixed so that they face each other inward.
[0021]
The central hole (30) of the inward flange (29) provided at the middle part of the inner surface of the left and right cylindrical portions (20) is inserted into the other male screw (26), and the enlarged diameter flange ( 24) and an inward flange portion (29), and between the inward flange portion (29) and a cap nut (31) serving as a fastening means screwed into the male screw portion (26). By tightening the cap nut (31) by interposing resistance force applying means (34) comprising one or a plurality of disc springs (32) and one or a plurality of friction plates (33), respectively, A required resistance force can be applied to the rotation of the support cylinder (13) around the axis (23). This resistance can be adjusted by adjusting the amount of tightening of the cap nut (31).
[0022]
In the example shown in FIG. 4, the resistance applying means (34) outside the inward flange (29) of the cylindrical portion (20) includes one disc spring (32) and three friction plates (33). ), And the resistance applying means (34) inside the inward flange (29) comprises two disc springs (32) and two friction plates (33). is there.
[0023]
An eccentric portion on the inner side surface of each support member (22) is integrally formed with a convex portion (35) projecting in parallel with the axis (23) and having an arc shape in a side view, and a cylindrical portion (20) opposed thereto. The outer end surface of ()) is provided with an arc-shaped concave portion (36) having a circumferential length larger than the length of the convex portion (35) in the same direction, and the convex portion (35) is formed in the concave portion (36). By fitting, the rotation angle of the support cylinder (13) around the axis (23) can be restricted to a required range.
[0024]
In addition, you may provide a convex part (35) in the cylinder part (20) side, and provide a concave part (36) in the support member (22) side.
[0025]
As shown in FIGS. 5 to 8, the support tube (13) has a cross-sectional shape provided at the rear center thereof with a vertex portion that expands in a V-shape in plan view with an angle of 90 ° toward the front. And the rear surface of the raising / lowering rod (16) opposed thereto is formed in a shape substantially complementary to the front surface of the rear part of the support cylinder (13), so that the lifting rod (16) 13) It is possible to always move up and down smoothly without twisting.
[0026]
A vertical groove (37) extending from the lower end to a position slightly lower than the upper end is provided on the front surface at the rear center of the support cylinder (13). The corresponding groove (37) is provided at the rear lower end of the corresponding lifting rod (16). Is engaged in the groove (37) at all times, and when the lifting rod (16) is raised to a predetermined position, it engages with the upper end of the groove (37) and the lifting rod (16) An outward engaging claw (38) is provided to prevent the further upward movement of the engaging claw.
[0027]
The engaging claw (38) is formed integrally with the lifting / lowering rod (16) so as to be elastically deformable inward of the lifting / lowering rod (16). The lifting rod (16) can be pulled out from the support tube (13) upward or can be inserted in reverse.
[0028]
When removing the lifting rod (16) from the support cylinder (13), remove the closing member (18) from the opening (12), insert a finger into the opening (12), and engage the upper end of the groove (37). The engaged hooks can be elastically bent inward to easily release the engagement.
[0029]
The closing member (18) has a vertically long rectangular plate shape, and its lower end is inserted inside the lower edge of the opening (12) in the front surface of the support cylinder (13), and a boss provided at the upper end. A set screw (41) fitted to a protruding shaft (40) protruding above the opening (12) on the front surface of the support cylinder (13) and fixed to the front end of the protruded shaft (40). Of the boss (39) from the protruding shaft (40) at the head (41a) of the head, and a pair of left and right outward locking claws (42) extending rearward from both sides of the middle part. ) Is engaged with engagement grooves (43) provided on both sides of the middle portion of the opening (12) in the support cylinder (13), so that the opening (12) is formed on the front surface of the support cylinder (13). It is attached so as to close.
[0030]
At the center of the closing member (18), two parallel slits (44) and (44) are provided which face in the vertical direction, and a flexible piece (45) is formed between the slits (44) and (44). Have been.
[0031]
At the upper end portion of the flexible piece (45), a thin easily bent piece (46) is provided, and on the upper rear surface of the flexible piece (45) immediately below the flexible piece (45), the above-mentioned horizontal bar-shaped protrusion (17) is provided. ) Is provided so as to project rearward.
[0032]
As the flexible piece (45) elastically bends forward, the ridges (17) are selectively elastically engaged with the plurality of concave grooves (15) of the lifting rod (16), and 16) can be maintained at the desired stepwise height.
[0033]
As shown in FIG. 5 and FIGS. 9 to 11, the upper end of the elevating rod (16) is formed of a synthetic resin material having elasticity and is formed in a bifurcated V-shape that opens in the left-right direction and faces forward. At the front end of (47), a headrest support portion (14) comprising a short transverse shaft portion (48) and a headed shaft (49) protruding at the front center thereof is formed.
[0034]
The front surface of the horizontal shaft portion (48) forms a pillow receiving surface (48a) that protrudes forward and has a convex arc shape in a side view.
[0035]
The headed shaft (49) has a shaft portion (49a) protruding so as to face the direction of the normal to the pillow receiving surface (48a), and a disk-shaped widened head provided at the front end thereof. 49b) and a hemispherical or semi-cylindrical projection (49c) provided on the rear surface of the left and right sides of the widened head (49b). In this example, the widened head (49b) has a disk shape, but may have a rectangular plate shape long in the left-right direction or other shapes.
[0036]
The headrest (11) has a front shell (53) of substantially the same shape in which a cushion material (51) and a covering material (52) are attached to the front surface of a substantially inverted isosceles triangular rear shell (50). A pair of left and right fitting surfaces (54) and (54) having a concave arc shape in a side view and having substantially the same curvature as the pillow receiving surface (48a) are provided on the rear surface of the rear shell (50). And a pair of left and right long holes (55) oriented vertically so that the shaft portion (49a) of the headed shaft (49) can be inserted in each fitting surface (54), and each long hole (55). In the middle part (or upper and lower ends) of the opposing edges of (1), there are provided enlarged holes (57) which are continuously provided so as to face inward via a narrow portion (56).
[0037]
The distance between the left and right long holes (55) and (55) is the same as the distance between the left and right headed shafts (49) and (49) when no external force is applied, and the position and size of each enlarged hole (57). The widened head (49b) of the left and right headed shafts (49) is obtained by elastically bending the left and right branch portions (47) and (47) at the upper end of the elevating rod (16) inwardly. ) Is inserted into the corresponding enlarged hole (57) at the same time, or one of them is inserted first, and after the shaft portion (49a) is positioned in the elongated hole (55) through the narrow portion (56), the other is inserted. Are inserted so that they can be inserted sequentially.
[0038]
Therefore, the shaft portions (49a) (49a) of the left and right headed shafts (49) and (49) are adjusted by using the left and right enlarged holes (57) and (57). ) Is positioned in front of the rear shell (50), fits into the left and right long holes (55), (55) of the rear shell (50), and fits left and right of the left and right rear shells (50). The mating surfaces (54) and (54) are fitted to the left and right pillow receiving surfaces (48a) and (48a), and the rear shell (50) and the entire headrest (11) integrated therewith are moved to the upper end of the lifting rod (16). The headrest support portion (14) can be easily mounted on the headrest support portion (14) in such a manner that it can swing up and down around the horizontal shaft portions (48) and (48).
[0039]
Between both sides of the widened head (49b) of the headed shaft (49) and the front surface of the rear shell (50), an arc shape having the same center of curvature as the pillow receiving surface (48a) is formed, and Synthetic resin in which upper and lower ends are locked inside upper and lower protruding pieces (58) and (59) protruding from the front surface of the rear shell (50), and the intermediate portion can be elastically bent in the front-rear direction. A leaf spring material (60) is provided.
[0040]
The leaf spring member (60) has a vertically rectangular shape in a front view, and has an upper end opened at the center, and a vertically oriented slit (61) through which a shaft portion (49a) of a headed shaft (49) is inserted. ) Is formed.
[0041]
On the front surface on both sides of the slit (61) in the leaf spring material (60), protrusions (49c) provided on both sides of the rear surface of the widened head (49b) on the headed shaft (49) are selectively elastically engaged. A plurality of left and right recesses (recesses) (62) are provided continuously at small intervals in the vertical direction. The front surface of the leaf spring material (60) is as shown in FIG. In addition, it has a side-view corrugated surface that is vertically continuous.
[0042]
Each projection (49c) of the headed shaft (49) is pressed against this corrugated surface to rotate the headrest (11) in the vertical direction about the horizontal shaft (48). Are stepwise elastically engaged with the vertically adjacent recesses (62) step by step, and a moderate resistance can be applied to the rotation operation of the headrest (11).
[0043]
That is, in this example, the projection (49c) on the headed shaft (49) and the leaf spring member (60) provide a resistance force that imparts resistance to the rotation of the headrest (11) with respect to the pillow support rod (10). Means are formed.
[0044]
According to this embodiment, without operating the release lever or the like, the pillow support rod (10) is moved up and down in the front-rear direction, or the headrest (11) is rotated with respect to the pillow support rod (10). In addition, the position and orientation of the headrest (11) can be set to an optimum state in a timely and easy manner in accordance with the occupant's body type and sitting posture.
[0045]
【The invention's effect】
According to the first aspect of the present invention, the height of the headrest can be easily adjusted only by raising and lowering the headrest against the elastic engagement force between the engaging portion and the engaged portion, and the supporting cylinder can By inserting the closing member into the opening of the support cylinder after inserting the lifting rod, it can be easily assembled, and can be easily disassembled in the reverse order.
In addition, since the height adjustment device of the headrest is formed by the support cylinder, the lifting rod, and the closing member, the structure is simple and easy to manufacture as compared with the conventional height adjustment device having many small parts.
[0046]
According to the second aspect of the invention, the rear surface of the lifting rod, which is complementary to the V-shaped front surface of the supporting cylinder, is slidably in contact with the front surface of the rear part of the supporting cylinder. It can always move up and down smoothly without occurrence.
[0047]
According to the third aspect of the present invention, since the outward engaging claw is engaged with the upper end of the groove, the elevating rod can be securely prevented from falling out of the support cylinder, and the elevating rod is dislodged from the support cylinder unnecessarily. Can be prevented.
[0048]
According to the fourth aspect of the present invention, the rear surfaces on both sides of the outwardly engaging claws of the elevating rod are slidably contacted with the front surface of the rear portion of the support cylinder having a V-shape in plan view, so that the guide is smoothly guided. The torsional force around the axis of the lifting rod and other external forces do not act on the direction engaging claw, and the outward engaging claw does not cause a stick phenomenon in the groove or hinder the ascending and descending. It is convenient.
[0049]
According to the fifth aspect of the invention, the closing member is provided with two slits parallel to each other, so that a flexible piece is formed between the slits, and the flexible piece exerts an appropriate elastic force on the engaging portion. Can be granted.
[0050]
According to the sixth aspect of the present invention, the closing member can be easily and reliably attached to the support cylinder, and can be easily removed.
[Brief description of the drawings]
FIG. 1 is a front view of a chair provided with an embodiment of the present invention.
FIG. 2 is also a side view.
FIG. 3 is also a plan view.
FIG. 4 is a cross-sectional plan view taken along the line IV-IV in FIG. 1;
FIG. 5 is an enlarged vertical sectional side view taken along the line VV of FIG. 3;
FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;
FIG. 7 is a sectional view taken along line VII-VII in FIG. 5;
8 is a vertical sectional front view taken along the line VIII-VIII in FIG. 5;
9 is a cross-sectional plan view taken along the line IX-IX of FIG.
FIG. 10 is a vertical sectional front view taken along line XX of FIG. 9;
FIG. 11 is a vertical sectional side view taken along line XI-XI in FIG. 9;
[Explanation of symbols]
(1) Leg (2) Support (3) Seat (4) Backrest (5) Shaft (6) Supporting rod (6a) Horizontal part (6b) Standing part (7) Upper frame (8) Backrest member (9 ) Headrest device (10) Pillow support rod (11) Headrest (12) Opening (13) Support cylinder (14) Headrest support portion (15) Groove (engaged portion)
(16) Lifting rod (17) Ridge (engagement part)
(18) closing member (19) branching portion (20) cylindrical portion (21) set screw (22) support member (support portion)
(23) Shaft (24) Large-diameter flange (25) (26) Male thread (27) Planed surface (28) Cap nut (29) Inward flange (30) Central hole (31) Cap nut (tightening means)
(32) Disc spring (33) Friction plate (34) Resistance applying means (35) Convex portion (36) Concave portion (37) Groove (38) Engagement claw (39) Boss (40) Protruding shaft (41) Set screw (41a) Head (42) Outward locking claw (43) Engagement groove (44) Slit (45) Flexible piece (46) Easy bending piece (47) Branch (48) Lateral shaft ( 48a) Pillow receiving surface (49) Headed shaft (49a) Shaft (49b) Widened head (49c) Projection (50) Rear shell (51) Cushion material (52) Surface material (53) Front shell (54) Fitting surface (55) Long hole (56) Narrow width part (57) Enlarged hole (58) (59) Projection piece (60) Leaf spring material (61) Slit (62) Concave stripe (recess)

Claims (6)

背凭れの上部より起立し、かつ上端部でヘッドレストを支持するようにした枕支持杆を、下端部が背凭れの上部に取り付けられ、ほぼ上方を向くとともに、側面に開口が設けられた支持筒と、この支持筒内に上方より摺動自在に嵌合され、かつ上端部にヘッドレスト支持部が形成されるとともに、前記開口に対向する面に、複数の被係合部が上下多段状に設けられた昇降杆と、前記開口を閉塞するように前記支持筒の側面に着脱自在に設けられ、かつ前記昇降杆の複数の被係合部に選択的に弾性係合することにより、前記昇降杆を所望の高さに保持しうる弾性変形可能な係合部を有する閉塞部材とにより構成したことを特徴とする椅子のヘッドレスト装置。A pillow support rod that rises from the upper part of the backrest and supports the headrest at the upper end, and a lower end part is attached to the upper part of the backrest, and is directed substantially upward, and a support cylinder having an opening on the side. A headrest support portion is formed at an upper end portion of the support tube so as to be slidable from above, and a plurality of engaged portions are provided in a vertically multi-stage shape on a surface facing the opening. The lifting rod, which is detachably provided on a side surface of the support cylinder so as to close the opening, and selectively elastically engages with a plurality of engaged portions of the lifting rod. And a closing member having an elastically deformable engaging portion capable of holding the head at a desired height. 支持筒の後部の横断面を、前方に向かって拡開する平面視V字状とするとともに、昇降杆の後面を、前記支持筒の後部の前面に補形をなす形状とした請求項1記載の椅子のヘッドレスト装置。2. The cross section of the rear part of the support cylinder has a V-shape in plan view that expands forward, and the rear surface of the lifting rod has a shape that complements the front surface of the rear part of the support cylinder. Chair headrest device. 昇降杆の下部に、内方に向けて弾性変形可能な外向き係合爪を設け、支持筒の内面に、前記外向き係合爪が嵌合し、かつ上端が支持筒の上端より下方の位置で終端する上下方向を向く溝条を設け、前記外向き係合爪が前記溝条の上端に係合することにより、昇降杆を支持筒から抜け止めしうるようにした請求項1記または2載の椅子のヘッドレスト装置。An outward engaging claw elastically deformable inward is provided at a lower portion of the elevating rod, and the outward engaging claw is fitted on an inner surface of the support cylinder, and an upper end is lower than an upper end of the support cylinder. A vertical groove that terminates at a position is provided, and the outward engagement claw is engaged with an upper end of the groove so that the lifting rod can be prevented from falling out of the support cylinder. Headrest device for two chairs. 外向き係合爪を、昇降杆の後面ほぼ中央に設けるとともに、溝条を、支持筒の後部の前面ほぼ中央に設けた請求項1〜3のいずれかに記載の椅子のヘッドレスト装置。The chair headrest device according to any one of claims 1 to 3, wherein the outward engaging claw is provided substantially at the center of the rear surface of the lifting rod, and the groove is provided substantially at the center of the front surface of the rear portion of the support cylinder. 閉塞部材に、互いに平行な2条のスリットを設けることにより、両スリット間に可撓片を形成し、この可撓片に係合部を設けた請求項1〜4のいずれかに記載の椅子のヘッドレスト装置。The chair according to any one of claims 1 to 4, wherein the closing member is provided with two parallel slits to form a flexible piece between the slits, and the flexible piece is provided with an engaging portion. Headrest device. 閉塞部材の下端部を、支持筒における開口の下縁部の内側に係合し、かつ閉塞部材の上端部を、支持筒における開口の上縁部にねじ止めした請求項1〜5のいずれかに記載の椅子のヘッドレスト装置。The lower end of the closing member is engaged with the inside of the lower edge of the opening in the support tube, and the upper end of the closing member is screwed to the upper edge of the opening in the support tube. A headrest device for a chair according to claim 1.
JP2002218720A 2002-07-26 2002-07-26 Chair headrest device Expired - Fee Related JP4149758B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007135630A (en) * 2005-11-14 2007-06-07 Okamura Corp Headrest device of chair
JP2007135632A (en) * 2005-11-14 2007-06-07 Okamura Corp Headrest device of chair
KR100856788B1 (en) 2006-11-16 2008-09-05 김해용 A headrest frame unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007135630A (en) * 2005-11-14 2007-06-07 Okamura Corp Headrest device of chair
JP2007135632A (en) * 2005-11-14 2007-06-07 Okamura Corp Headrest device of chair
JP4607741B2 (en) * 2005-11-14 2011-01-05 株式会社岡村製作所 Chair headrest device
JP4704892B2 (en) * 2005-11-14 2011-06-22 株式会社岡村製作所 Chair headrest device
KR100856788B1 (en) 2006-11-16 2008-09-05 김해용 A headrest frame unit

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