JP2004057400A

JP2004057400A - Headrest device for chair

Info

Publication number: JP2004057400A
Application number: JP2002218722A
Authority: JP
Inventors: Naoki Numa; 沼　直樹
Original assignee: Okamura Corp
Current assignee: Okamura Corp
Priority date: 2002-07-26
Filing date: 2002-07-26
Publication date: 2004-02-26
Anticipated expiration: 2022-07-26
Also published as: JP4102613B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device for a chair enabling simple, quick attachment of a headrest to a pillow supporting rod without shaft fixing work, and at the same time, of which the structure is simple, and which can be manufactured at a low cost. <P>SOLUTION: For this headrest device for a chair, a fitting surface 54 which is provided on the rear surface of a rear part shell 50 in a headrest 11 is vertically slidably fitted on a pillow fitting surface 54 having a protruding arc-shape when seen from the side surface, which is provided on the front surface at the upper end part of a pillow supporting rod 10 which stands from the upper part of a backrest. Also, the shaft part 49a of a shaft 49 having head which is projected from the front surface at the upper end part of the pillow supporting rod 10 is passed through a slot 55 which is provided on the rear surface of the rear part shell 50. At the same time, the widened head part 49b of the shaft 49 having head is brought in press-contact with the front surface side of the rear part shell 50. Thus, the headrest 11 is made vertically swingable along the pillow fitting surface 48a, and the headrest 11 is fitted on the front surface of the upper end part of the rod 10 to constitute the headrest device for a chair. <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、背凭れの上部より起立する枕支持杆の上端部に、ヘッドレストを上下方向に首振り可能として取り付ける取付構造に関する。
【０００２】
【従来の技術】
従来のこの種の装置としては、背凭れの上部より起立する枕支持杆の上端部に、ヘッドレストを左右方向を向く軸をもって枢着し、かつこの軸回りに、ばね等によりヘッドレストの回動に抵抗力を付与する手段を設けたものが一般的である。
【０００３】
【発明が解決しようとする課題】
しかし、上述のような従来の装置では、抵抗力付与手段の構造が複雑であるとともに、軸着作業が繁雑であり、組み付けに時間がかかる等の問題がある。
【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、軸着作業を行うことなく、ヘッドレストを簡単かつ迅速に枕支持杆に取り付けることができるとともに、構造が簡単で、安価に製造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する枕支持杆の上端部前面に、前方に向かって突出する側面視凸型円弧状の枕受け面を設けるとともに、前端に拡幅頭部を有する有頭軸を、前記枕受け面の法線の方向を向くようにして突設し、ヘッドレストにおける後部シェルの後面に、前記枕受け面とほぼ同一曲率の側面視凹型円弧状の嵌合面を設けるとともに、前記有頭軸の軸部が挿通しうる上下方向を向く長孔を設け、前記嵌合面を枕受け面に上下方向に摺動可能として嵌合し、かつ有頭軸の軸部を前記長孔に挿通させるとともに、有頭軸の拡幅頭部を前記後部シェルの前面側に圧接させることにより、ヘッドレストを、枕受け面に沿って上下方向に首振り可能として、枕支持杆の上端部前面に装着する。
【０００６】
（２）　上記（１）項において、有頭軸の拡幅頭部と、ヘッドレストにおける後部シェルの前面との間に、枕受け面とほぼ同一の曲率中心とする円弧状をなし、かつ上下の端部が後部シェルに係止されて、中間部がほぼ前後方向に弾性撓曲可能とした板ばね材を配設し、この板ばね材の前面に有頭軸の拡幅頭部を摩擦圧接させる。
【０００７】
（３）　上記（２）項において、板ばね材の前面に、有頭軸の拡幅頭部が係合しうるようにした複数の凹部を、上下方向に適宜の間隔で設ける。
【０００８】
（４）　上記（２）または（３）項において、板ばね材の前面を、上下方向に連続する波形面とする。
【０００９】
（５）　上記（１）〜（４）項のいずれかにおいて、枕支持杆の上端部を左右方向に二股状に分岐し、各分岐部の上端部に枕受け面と有頭軸とを設け、かつそれに対応して、ヘッドレストにおける後部シェルの後面に、嵌合面と長孔とを、左右に１対ずつ設ける。
【００１０】
（６）　上記（５）項において、左右の分岐部を互いに内方に向かって弾性撓曲可能とし、かつヘッドレストの後部シェルにおける左右の長孔の対向縁に、左右の分岐部を互いに内方に向かって弾性撓曲させることにより、左右の有頭軸の拡幅頭部を挿通しうるようにした左右１対の拡大孔を、狭幅部を介して互いに内方を向くように連設する。
【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、ヘッドレストにおける側面視凹型円弧状の嵌合面を、枕支持杆の上端部前面に設けた側面視凸型円弧状の枕受け面に嵌合し、かつ枕支持杆の上端部前面に突設した有頭軸の軸部を、ヘッドレストの後部シェルに設けた長孔に挿通させて、その拡幅頭部を後部シェルの前面側に圧接させることにより、ヘッドレストを、実際には枕支持杆に軸着することなく、簡単な構造だけで、軸着したのと同様の効果を得ることができるとともに、有頭軸の拡幅頭部を後部シェルの前面側に圧接させるだけで、抵抗力付与手段を簡単に形成することができる。しかも、ヘッドレストを簡単かつ迅速に枕支持杆に取り付けることができるとともに、構造が簡単で、安価に製造することができる。
【００４６】
請求項２記載の発明によると、板ばね材を設けたことにより、ヘッドレストの回動に抵抗力を付与するための大きな弾性付勢力を得ることができる。
【００４７】
請求項３及び４記載の発明によると、ヘッドレストの回動操作に節度感を持たせることができるとともに、ヘッドレストを複数の位置で安定して保持することができる。
【００４８】
請求項５記載の発明によると、ヘッドレストを安定して支持することができる。
【００４９】
請求項６記載の発明によると、枕支持杆の上端部における左右の分岐部を互いに内向きに弾性撓曲させて、左右の有頭軸を互いに近づけた状態で、両有頭軸の拡幅頭部を、ヘッドレストの後面における左右の拡大孔に挿通し、次いで、左右の分岐部の復元力により、両有頭軸を互いに拡開させつつ、それらの軸部を、左右の長孔にそれぞれ嵌合させるだけで、ヘッドレストを簡単かつ迅速に枕支持杆に取り付けることができる。
【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 headrest device for a chair, and more particularly to a mounting structure for mounting a headrest on an upper end portion of a pillow support rod rising from an upper portion of a backrest so that the headrest can swing up and down.
[0002]
[Prior art]
As a conventional device of this type, a headrest is pivotally mounted on an upper end portion of a pillow support rod rising from an upper portion of a backrest with an axis pointing in the left-right direction, and the headrest is rotated around the axis by a spring or the like. It is common to provide a means for imparting resistance.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, there are problems that the structure of the resistance applying means is complicated, the work for attaching the shaft is complicated, and the assembling takes time.
[0004]
The present invention has been made in view of the above-described problems of the related art, and enables a headrest to be easily and quickly attached to a pillow support rod without performing an axial mounting operation, and has a simple structure and is inexpensively manufactured. It is an object of the present invention to provide a chair headrest device that can be used.
[0005]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) On the front surface of the upper end of the pillow support rod rising from the upper part of the backrest, a convex arcuate pillow receiving surface that projects forward is provided, and a headed shaft having a widened head at the front end is provided. The projection is provided so as to face the direction of the normal line of the pillow receiving surface, and a concave arcuate fitting surface in side view having substantially the same curvature as the pillow receiving surface is provided on the rear surface of the rear shell of the headrest, An elongated hole extending in the vertical direction through which the shaft of the headed shaft can be inserted is provided, the fitting surface is fitted to the pillow receiving surface in a vertically slidable manner, and the shaft of the headed shaft is inserted into the elongated hole. The headrest can be swung up and down along the pillow receiving surface by pressing the widened head of the headed shaft against the front side of the rear shell, and Installing.
[0006]
(2) In the above item (1), between the widened head portion of the headed shaft and the front surface of the rear shell of the headrest, an arc shape having substantially the same center of curvature as the pillow receiving surface is formed, and the upper and lower ends are formed. A leaf spring material whose portion is locked to the rear shell and whose middle portion is elastically bendable substantially in the front-rear direction is disposed, and the widened head of the headed shaft is frictionally pressed against the front surface of the leaf spring material.
[0007]
(3) In the above item (2), a plurality of recesses in which the widened head of the headed shaft can be engaged are provided at appropriate intervals in the vertical direction on the front surface of the leaf spring material.
[0008]
(4) In the above item (2) or (3), the front surface of the leaf spring material is a wavy surface that is vertically continuous.
[0009]
(5) In any one of the above items (1) to (4), the upper end of the pillow support rod is bifurcated in the left-right direction, and a pillow receiving surface and a headed shaft are provided at the upper end of each branch. And, correspondingly, on the rear surface of the rear shell of the headrest, a pair of fitting surfaces and long holes are provided on the left and right.
[0010]
(6) In the above item (5), the left and right branch portions can be elastically bent inward to each other, and the left and right branch portions are formed inwardly of each other at opposing edges of the left and right long holes in the rear shell of the headrest. A pair of left and right enlarged holes, which can be inserted through the widened heads of the left and right headed shafts by being elastically bent toward, are connected to each other inwardly through a narrow portion. .
[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 concave-shaped fitting surface of the concave shape in the side view of the headrest is fitted to the convex-shaped circular pillow receiving surface provided in the front surface of the upper end portion of the pillow support rod, and the pillow support is provided. By inserting the shaft of the headed shaft protruding from the front end of the upper end of the rod into the long hole provided in the rear shell of the headrest, and pressing the widened head against the front side of the rear shell, the headrest is Actually, the same effect as when the shaft is attached can be obtained with a simple structure without being attached to the pillow support rod, and the widened head of the headed shaft is pressed against the front side of the rear shell. Only by this, the resistance applying means can be easily formed. In addition, the headrest can be easily and quickly attached to the pillow support rod, and the structure is simple and can be manufactured at low cost.
[0046]
According to the second aspect of the present invention, by providing the leaf spring material, it is possible to obtain a large elastic biasing force for giving a resistance to the rotation of the headrest.
[0047]
According to the third and fourth aspects of the present invention, it is possible to give a sense of moderation to the rotation operation of the headrest and to stably hold the headrest at a plurality of positions.
[0048]
According to the fifth aspect of the invention, the headrest can be stably supported.
[0049]
According to the invention as set forth in claim 6, the left and right branch portions at the upper end of the pillow support rod are elastically bent inward to each other, and the widened heads of the two headed shafts are brought close to each other while the left and right headed shafts are brought close to each other. Part into the left and right enlarged holes on the rear surface of the headrest, and then, by the restoring force of the left and right branch parts, while expanding both headed shafts to each other, fit those shaft parts into the left and right long holes respectively. The headrest can be easily and quickly attached to the pillow support rod simply by fitting.
[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

A pillow support surface having a convex arcuate shape in a side view projecting forward is provided on a front surface of an upper end portion of a pillow support rod rising from an upper portion of a backrest, and a headed shaft having a widened head at a front end is provided with the pillow A rear surface of the rear shell of the headrest is provided with a concave arcuate fitting surface having substantially the same curvature as the pillow receiving surface, and the headed shaft A vertically extending slot through which the shaft portion can be inserted, the fitting surface is slidably fitted to the pillow receiving surface in the vertical direction, and the shaft portion of the headed shaft is inserted through the elongated hole. At the same time, the headrest can be swung up and down along the pillow receiving surface by pressing the widened head of the headed shaft against the front side of the rear shell, and attached to the front surface of the upper end of the pillow support rod. A headrest device for a chair.

Between the widened head of the headed shaft and the front surface of the rear shell in the headrest, it forms an arc shape with the center of curvature substantially the same as the pillow receiving surface, and the upper and lower ends are locked to the rear shell, 2. The headrest device for a chair according to claim 1, wherein a leaf spring material whose middle portion is elastically bendable substantially in the front-rear direction is disposed, and a widened head of the headed shaft is frictionally pressed against a front surface of the leaf spring material.

3. The headrest device for a chair according to claim 2, wherein a plurality of recesses are provided on the front surface of the leaf spring material at appropriate intervals in a vertical direction so that the widened head of the headed shaft can be engaged.

4. The headrest device for a chair according to claim 2, wherein the front surface of the leaf spring member is a corrugated surface that is continuous in a vertical direction.

The upper end of the pillow support rod is bifurcated in the left-right direction, a pillow receiving surface and a headed shaft are provided at the upper end of each branch, and correspondingly, fitted to the rear surface of the rear shell of the headrest. The headrest device for a chair according to any one of claims 1 to 4, wherein the surface and the long hole are provided in a pair on the right and left sides.

By making the left and right branch portions elastically bendable inward toward each other, and at the opposing edges of the left and right long holes in the rear shell of the headrest, the left and right branch portions are elastically bent inward each other, 6. The headrest device for a chair according to claim 5, wherein a pair of left and right enlarged holes through which the widened heads of the left and right headed shafts can be inserted are connected to each other inwardly through a narrow portion.