JP3637732B2

JP3637732B2 - Chair armrest device

Info

Publication number: JP3637732B2
Application number: JP12724097A
Authority: JP
Inventors: 浩岩淵; 雅史藪内; 憲治野瀬
Original assignee: 株式会社イトーキクレビオ
Priority date: 1997-05-16
Filing date: 1997-05-16
Publication date: 2005-04-13
Anticipated expiration: 2017-05-16
Also published as: JPH10313973A

Description

【０００１】
【発明の属する技術分野】
本発明は、椅子の肘掛け装置に係わり、更に詳しくは肘掛け部が高さ調節可能且つ水平角度調節可能な椅子の肘掛け装置に関する。
【０００２】
【従来の技術】
従来、椅子の肘掛け部が座部又は脚部から立ち上がった支持部に対して高さ調節可能なものは既に提供されている。そして、肘掛け部の高さ調節機構としては、支持部を外杆と内杆とで伸縮自在に構成するとともに、固定側の杆体に上下方向に一定間隔毎に係合孔を形成し、可動側の杆体から出没する係合爪を前記係合孔に係脱することによって多段階で高さ調節するもの、あるいは支持部内に配したガスシリンダーにて肘掛け部を無段階で高さ調節するものがあり、係合爪を出没操作する操作部材あるいはガスシリンダーを制御する操作部材を肘掛け部の内部又は近傍に配したレバーに連動させた構造が存在する。
【０００３】
一方、支持部に対して肘掛け部が水平角度調節可能なものも既に提供されている。そして、肘掛け部の水平角度調節機構としては、支持部の上端に肘掛け部の適所を回動可能に枢着するとともに、支持部の前後一端部に複数の係合凹部を横方向に所定間隔で形成し、該係合凹部に肘掛け部の前後一端部に突設した突起を弾性的に嵌合して角度調節するものがあり、それを操作するための部分又はレバーを肘掛け部に設けた構造が存在する。
【０００４】
また、肘掛け部が高さ調節可能であるとともに、水平角度調節可能であるものも存在する。この場合、高さ調節機構と水平角度調節機構とは全く独立した機構となっており、それぞれを操作するためのレバーが肘掛け部又はその近傍に設けられている。従って、肘掛け部の高さと角度を共に調節する場合には、それぞれのレバーを操作しなければならず、その操作が非常に手間であるばかりでなく、レバーが露出しているので外観性を損なうといった問題も有する。また、肘掛け部の高さ及び角度を調節する場合には、肘から先の腕を肘掛け部から離して行わなければならないので、調節した後に肘掛け部に腕を乗せて調節具合を確かめ、具合が悪ければ再度調節する必要があった。あるいは、肘掛け部に乗せた腕とは反対側の手で調節を行っていたので、操作に無理があった。
【０００５】
【発明が解決しようとする課題】
本発明が前述の状況に鑑み、解決しようとするところは、肘掛け部が高さ調節可能且つ水平角度調節可能な椅子の肘掛け装置において、高さ及び角度の調節用のレバーを一切設けず、しかも肘から先の腕を肘掛け部に乗せたまま、一連の簡単な操作で肘掛け部の高さと角度を同時に調節することができるようになした椅子の肘掛け装置を提供する点にある。
【０００６】
【課題を解決するための手段】
本発明は、前述の課題解決のために、座部又は脚部から立ち上がった支持部に対して肘掛け部が高さ調節可能且つ水平角度調節可能な椅子の肘掛け装置であって、支持部に肘掛け部を所定高さに係合保持し且つ操作部材の変位によって係合を係脱する高さ調節機構を備えるとともに、前記支持部の上端に前後方向に向けて固定した固定部材に可動部材を上方から重ね、固定部材の後部に対して可動部材の後部を回転可能且つ前後スライド移動可能に連結するとともに、可動部材の後方弾性付勢力によって固定部材前端の係合突起と可動部材の前部に横方向に配した複数の後向きの係合溝とで互いに係合可能としてなる角度調節機構を備え、前記高さ調節機構の操作部材の上端部を前記角度調節機構の可動部材の適所に形成した円弧溝内に係合させ、肘掛け部を前方向に弾性付勢力に抗して移動させることで高さ調節と水平角度調節とを行えるとともに、後方向に復帰させることで設定高さと設定角度を維持してなる椅子の肘掛け装置を構成した。
【０００７】
【発明の実施の形態】
次に本発明の実施形態を添付図面に基づき更に詳細に説明する。図１は本発明に係る椅子を示し、図２〜図８は本発明の実施形態の要部を示し、図中１は椅子の脚部、２は座部、３は背凭れ部、４は肘掛け装置、５は支持部、６は肘掛け部をそれぞれ示している。
【０００８】
本発明の実施形態に係る肘掛け装置４は、座部２又は脚部１から立ち上がった支持部５に対して肘掛け部６を高さ調節可能且つ水平角度調節可能若しくは横振り調節可能に設けたものである。前記支持部５は、座部２に固定した支持アーム７の上部に、中空状の昇降体８を上下スライド可能に外嵌した構造を有する。そして、前記支持アーム７と昇降体８との間には、支持アーム７に対して昇降体８の高さを調節し且つその高さを維持するための高さ調節機構が設けられている。また、前記昇降体８の上端には、水平角度調節機構を構成する固定部材９が固着されており、同様に水平角度調節機構を構成する肘掛け部６の補強を兼ねた可動部材１０が前記固定部材９に対して角度調節可能に取付けている。
【０００９】
先ず、本発明の肘掛け装置４の高さ調節機構を図２〜図７に基づいて説明する。前記支持部５を構成する支持アーム７の上端部には、断面長方形状の筒状の支持管１１を長辺が椅子の前後方向に配向するように固定し、該支持管１１の上端には合成樹脂製のキャップ１２を外嵌している。そして、昇降体８を構成する厚肉長尺板状の昇降杆１３の上端に固定部材９を固着し、該昇降杆１３を前記キャップ１２の中央部に開設した摺動孔１４に上下スライド可能に嵌挿するとともに、該昇降杆１３の下端に嵌着した合成樹脂製のスライダー１５を前記支持管１１内に上下スライド可能に嵌挿している。また、前記支持管１１の内部であって、前記キャップ１２とスライダー１５間には、前記昇降杆１３を前後に挟んだ位置に引張りコイルばね１６，１６を介装し、常時昇降杆１３が上昇するように弾性付勢している。具体的には、キャップ１２に設けた係止部１２Ａ，１２Ａと、スライダー１５に設けた係止部１５Ａ，１５Ａとにそれぞれ引張りコイルばね１６の両端のフック部１６Ａ，１６Ａを係止している。
【００１０】
そして、前記支持管１１に対して昇降杆１３を所定高さ位置に係合保持し且つ操作部材１７の変位によって係合を係脱して高さ調節可能とするために、前記支持管１１の長辺側一側面１１Ａの中央部であって、略全長にわたって内向きに突出形成した凸台１１Ｃに沿って上下方向に縦孔１８を形成するとともに、該縦孔１８の前縁に一定間隔毎に係合凹部１９，…を形成し、該係合凹部１９とは反対側の前記昇降杆１３の側面の上下中央部に操作部材１７を構成する操作杆２０の中央部を支軸２１にて枢着するとともに、該操作杆２０の下端に形成した下向きＵ字溝２２内に、前記縦孔１８を貫通し且つ昇降杆１３の下部に形成した横長孔２３を貫通した係合ピン２４の端部を位置させている。この係合ピン２４は、軸部２４Ａの直径が前記縦孔１８の横幅よりも若干小さく、一端に該縦孔１８を通過しない頭部２４Ｂを有するとともに、他端にＵ字溝２２の外周に当止して抜止めするためのＥリング２５を嵌着する嵌合溝２４Ｃを形成したものである。ここで、前記支持管１１の他側面１１Ｂの上部には、前記係合ピン２４にＥリング２５を嵌合するための作業用開口２６を形成している。また、前記キャップ１２には、前記操作杆２０を挿通し且つ該操作杆２０の前後変位が可能なように摺動孔１４に連続して挿通孔２７を形成している。
【００１１】
ここで、前記支持管１１は、本実施形態では断面長方形状の筒状のものを示したが、他側面１１Ｂの作業用開口２６が全長に形成された断面略Ｃ字形の筒状部材であっても良い。また、前記縦孔１８と係合凹部１９，…とを、断面長方形状の筒状の支持管１１の両側面１１Ａ，１１Ｂの中央部に沿って形成し、前記昇降杆１３を断面略コ字形に形成し、その両対向板間のスリット状の溝内に前記同様の操作杆２０を回動可能に内装し、昇降杆１３の両対向板に前記同様に横長孔２３を形成し、前記両縦孔１８，１８及び横長孔２３，２３並びに操作杆２０のＵ字溝２２を貫通させて係合ピン２４を配設しても良い。尚、前記支持管１１は、前記支持アーム７の上端部の角筒部に内嵌し且つ固着されている。
【００１２】
この高さ調節機構においては、前記操作部材１７としての操作杆２０の上端を前後に変位させることによって、支軸２１を中心として下端が前後逆に変位し、Ｕ字溝２２に係合した係合ピン２４が横長孔２３内を移動し、該係合ピン２４が前記縦孔１８に位置する高さ調節可能な状態（図３参照）と、係合凹部１９に係合した高さ維持状態（図２参照）とを実現するのである。ここで、前記係合ピン２４は、前記係合凹部１９に係合する方向にキックばね等のばね体によって直接的又は間接的に弾性付勢することも好ましい。
【００１３】
次に、肘掛け部６の水平角度調節機構を図２〜図５、図８〜図１０に基づいて説明する。本実施形態では、水平面内において肘掛け部６を後部に対して前部を左右に振って水平角度を調節することができる構造を例示するが、肘掛け部６を前部に対して後部を左右に振って水平角度を調節することも可能であり、その場合には、後述の構造を前後逆にすれば良い。
【００１４】
この肘掛け部６の構造は、前記昇降杆１３の上端に前後方向に向けて固定した固定部材９に、可動部材１０を上方から重ねるとともに、固定部材９の後部に対して可動部材１０の後部を回転可能且つ前後スライド移動可能に連結するとともに、固定部材９と可動部材１０の前部で互いに係合可能となしたものである。具体的には、前記固定部材９は、前後方向に延びた部材であり、その後部に、後端に開口して前方へ延びた円形穴２８を形成するとともに、後部上面に開口し前記円形穴２８に連通したスリット溝２９を形成し、また前端中央部に係合突起３０を突設したものである。前記円形穴２８の直径はスリット溝２９の横幅よりも大きく設定している。一方、前記可動部材１０は、前記固定部材９によりも横幅の広い板状の部材であり、後部下面に前記円形穴２８にスライド可能に嵌合する球部３１と前記スリット溝２９を貫通する円柱部３２とを有する回転且つスライド可能な軸部材３３を突設するとともに、前端部下面を段状に下方へ突出させ、この突出部３４の後縁を前記軸部材３３を中心とした円周の円弧面３５となすとともに、該円弧面３５に開口して軸部材３３を中心に放射状に前方へ延びた係合溝３６を所定間隔毎に左右に複数設けている。尚、前記突出部３４を更に下方へ延設し、その下部を後方へ延設して前記固定部材９の前部を受け入れるようにすれば、可動部材１０の前部を持ち上げる際に、前記軸部材３３に無理な力が加わらないので好ましい。
【００１５】
そして、前記軸部材３３の球部３１を円形穴２８に挿入し且つ円柱部３２をスリット溝２９に挿入して固定部材９の上面に可動部材１０を重合する。また、前記円形穴２８内にはその内奥端と軸部材３３との間に圧縮コイルばね３７を圧縮介装し、固定部材９に対して可動部材１０を後方へ弾性付勢することによって、固定部材９の係合突起３０に可動部材１０の係合溝３６を係合させている。また、前記固定部材９の側方から上方へ突出した前記操作杆２０の上端部は、前記可動部材１０に設けた円弧溝３８内に収容している。ここで、前記円弧溝３８は、前記軸部材３３を中心とした円周に沿って形成している。
【００１６】
また、前記可動部材１０は、肘掛け部６の外形を形成する合成樹脂製の化粧カバー３９で覆われ、また前記支持管１１及び昇降杆１３は、上端が前記固定部材９に固定された二つ割りの合成樹脂製化粧カバー４０で覆われ、該化粧カバー４０は下部が前記支持アーム７の上部にスライド可能に外嵌している。
【００１７】
ここで、通常の状態では、前記圧縮コイルばね３７の弾性付勢力によって可動部材１０は最も後方位置にあり、前記固定部材９の係合突起３０が可動部材１０の何れかの係合溝３６に係合している（図２参照）。そして、前記圧縮コイルばね３７を圧縮しながら可動部材１０を固定部材９に対して前方へスライド移動させると、前記係合突起３０から係合溝３６が外れて、前記軸部材３３を中心として可動部材１０を左右に回転させることができ、所定角度に設定した後、前記圧縮コイルばね３７の弾性付勢力によって可動部材１０を後方へスライド復帰させ、係合突起３０に係合溝３６を係合して設定角度を維持するのである。また、肘掛け部６（化粧カバー３９）、即ち可動部材１０を前方へスライド移動させると、前記円弧溝３８内に位置する操作杆２０の上端部は、前方へ押されて前記支軸２１を中心として該操作杆２０の下端部は後方へ移動し、前記係合ピン２４が係合凹部１９から外れて縦孔１８に位置する（図３参照）。この状態で、肘掛け部６、即ち可動部材１０の前部を持ち上げたり、押し下げたりすることによって、前記支持アーム７に対して昇降体８を上下高さ調節することができ、肘掛け部６を所定の高さに設定した後に、前記圧縮コイルばね３７の弾性付勢力によって肘掛け部６、即ち可動部材１０を後方へ移動させると、何れかの係合溝３６に係合突起３０が係合して設定角度が維持されると同時に、何れかの係合凹部１９に係合ピン２４が係合して設定高さが維持される。
【００１８】
尚、肘掛け部６を後方へ移動させて高さ調節機構の係合を解除する構造のものは、背凭れ部３に凭れ掛かった状態から起き上がる際に、また椅子から立ち上がる際にも、肘掛け部６を後方へ力を入れて引っ張る動作を伴うので、不意に係合が解除される恐れがあり、そのため肘掛け部６は前方へ移動させて高さ調節機構及び水平角度調節機構の係合を解除する構造が好ましいのである。
【００１９】
【発明の効果】
以上にしてなる本発明の椅子の肘掛け装置は、肘から先の腕を肘掛け部に乗せたまま、両側の肘掛け部をそれぞれの手で持って前方へスライド移動させるといった一連の簡単な操作で肘掛け部の高さと水平方向の角度を調節することができる。例えば、机天板に載置したワープロやパソコンのキーボードを操作するのに適した肘掛け部の高さに設定できるとともに、キーボードやマウス操作の際に肘の開き角度に応じて肘掛け部の水平方向角度を調節することができ、肘から先の腕の安楽な支持状態を実現できる。また、高さ及び角度の調節用のレバーを一切設けず、肘掛け部自体を従来の操作レバーのように利用することができるので、外観性にも優れたものとなる。更に、高さ調節機構が簡単且つ信頼性が高く、耐久性の高い構造であるので、コスト上昇を抑制しつつ、肘掛け部の姿勢を最適に調節できる肘掛け装置を提供できるのである。
【図面の簡単な説明】
【図１】本発明の肘掛け装置を適用した椅子の側面図である。
【図２】本発明の実施形態に係る肘掛け装置の要部の縦断面図である。
【図３】同じく肘掛け部が前方へ移動した高さ調節可能な状態を示す要部の縦断面図である。
【図４】同じく分解斜視図である。
【図５】同じく組立状態の要部の斜視図である。
【図６】図２のＸ１−Ｘ１線断面図である。
【図７】図２のＸ２−Ｘ２線断面図である。
【図８】肘掛け部の省略平面図である。
【図９】同じく省略縦断面図である。
【図１０】同じく省略分解斜視図である。
【符号の説明】
１脚部２座部
３背凭れ部４肘掛け装置
５支持部６肘掛け部
７支持アーム８昇降体
９固定部材１０傾動部材
１１支持管（支持アーム）１２キャップ
１３昇降杆（昇降体）１４摺動孔
１５スライダー１６引張りコイルばね
１７操作部材１８縦孔
１９係合凹部２０操作杆（操作部材）
２１支軸２２Ｕ字溝
２３横長孔２４係合ピン
２５Ｅリング２６作業用開口
２７挿通孔２８円形穴
２９スリット溝３０係合突起
３１球部３２円柱部
３３軸部材３４突出部
３５円弧面３６係合溝
３７圧縮コイルばね３８円弧溝
３９化粧カバー４０化粧カバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armrest device for a chair, and more particularly to an armrest device for a chair whose armrest portion can be adjusted in height and whose horizontal angle can be adjusted.
[0002]
[Prior art]
Conventionally, there has already been provided a chair whose armrest can be adjusted in height with respect to a support that rises from a seat or a leg. And as the height adjustment mechanism of the armrest part, the support part is configured to be extendable and contractable between the outer collar and the inner collar, and the engagement hole is formed at regular intervals in the vertical direction on the stationary casing, There are those that adjust the height in multiple steps by engaging and disengaging the engaging claws that appear and disappear from the housing of the housing, or those that adjust the armrest in a stepless manner with a gas cylinder arranged in the support portion. There is a structure in which an operating member that moves the engaging claw in and out or an operating member that controls the gas cylinder is interlocked with a lever arranged in or near the armrest.
[0003]
On the other hand, an armrest that can adjust the horizontal angle with respect to the support has already been provided. As the horizontal angle adjustment mechanism of the armrest, an appropriate position of the armrest is pivotally attached to the upper end of the support, and a plurality of engagement recesses are laterally arranged at predetermined intervals in the front and rear ends of the support. There is a structure in which the projection is formed on the engagement recess and elastically fitted to the front and rear end portions of the armrest to adjust the angle, and the armrest is provided with a part or lever for operating it. Exists.
[0004]
There is also an armrest that can be adjusted in height and can be adjusted in horizontal angle. In this case, the height adjustment mechanism and the horizontal angle adjustment mechanism are completely independent mechanisms, and a lever for operating each is provided at or near the armrest. Therefore, when adjusting both the height and the angle of the armrest, each lever must be operated, which is not only very troublesome, but also the appearance is impaired because the lever is exposed. There are also problems such as. Also, when adjusting the height and angle of the armrest, the arm beyond the elbow must be moved away from the armrest, so after adjustment, put the arm on the armrest and check the adjustment. If it was bad, it had to be adjusted again. Or, since the adjustment was made with the hand opposite to the arm placed on the armrest, it was difficult to operate.
[0005]
[Problems to be solved by the invention]
In view of the above-mentioned situation, the present invention intends to solve a chair armrest device in which the armrest portion can be adjusted in height and the horizontal angle can be adjusted, and is provided with no lever for adjusting the height and angle. An object of the present invention is to provide an armrest device for a chair that allows the height and angle of the armrest portion to be adjusted at the same time by a series of simple operations while the arm from the elbow is placed on the armrest portion.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a chair armrest device in which an armrest portion can be adjusted in height and a horizontal angle can be adjusted with respect to a support portion standing up from a seat portion or a leg portion, A height adjustment mechanism that engages and holds the portion at a predetermined height and disengages the engagement by displacement of the operation member, and moves the movable member upward on a fixed member fixed in the front-rear direction to the upper end of the support portion. And the rear part of the movable member is connected to the rear part of the fixed member so as to be rotatable and slidable back and forth. An arc having an angle adjustment mechanism that can be engaged with each other by a plurality of rearward engagement grooves arranged in a direction, and an upper end portion of an operation member of the height adjustment mechanism formed at an appropriate position of a movable member of the angle adjustment mechanism Engage in groove Of the chair that maintains the set height and the set angle by moving the armrest part in the forward direction against the elastic biasing force and adjusting the height and the horizontal angle, and returning it in the backward direction. An armrest device was constructed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 shows a chair according to the present invention, FIGS. 2 to 8 show the main part of an embodiment of the present invention, in which 1 is a leg of the chair, 2 is a seat, 3 is a backrest, 4 is An armrest device, 5 is a support portion, and 6 is an armrest portion.
[0008]
In the armrest device 4 according to the embodiment of the present invention, the armrest portion 6 is provided so that the height can be adjusted and the horizontal angle can be adjusted or the horizontal swing can be adjusted with respect to the support portion 5 rising from the seat portion 2 or the leg portion 1. It is. The support portion 5 has a structure in which a hollow elevating body 8 is externally fitted on an upper portion of a support arm 7 fixed to the seat portion 2 so as to be vertically slidable. A height adjusting mechanism is provided between the support arm 7 and the lifting body 8 to adjust the height of the lifting body 8 with respect to the support arm 7 and to maintain the height. A fixed member 9 constituting a horizontal angle adjusting mechanism is fixed to the upper end of the elevating body 8, and a movable member 10 also serving as a reinforcement of an armrest portion 6 constituting the horizontal angle adjusting mechanism is fixed. It is attached to the member 9 so that the angle can be adjusted.
[0009]
First, the height adjusting mechanism of the armrest device 4 of the present invention will be described with reference to FIGS. A cylindrical support tube 11 having a rectangular cross section is fixed to the upper end of the support arm 7 constituting the support unit 5 so that the long side is oriented in the front-rear direction of the chair. A synthetic resin cap 12 is externally fitted. And the fixing member 9 is fixed to the upper end of the thick elongate plate-shaped elevating rod 13 constituting the elevating body 8, and the elevating rod 13 can be slid up and down in the sliding hole 14 formed in the central portion of the cap 12. And a synthetic resin slider 15 fitted to the lower end of the elevating rod 13 is inserted into the support tube 11 so as to be slidable up and down. Further, tension coil springs 16 and 16 are interposed in the support tube 11 between the cap 12 and the slider 15 at the position where the lifting rod 13 is sandwiched back and forth, and the lifting rod 13 is always raised. It is elastically biased to do. Specifically, the hook portions 16A and 16A at both ends of the tension coil spring 16 are locked to the locking portions 12A and 12A provided on the cap 12 and the locking portions 15A and 15A provided on the slider 15, respectively. .
[0010]
The height of the support tube 11 is adjusted so that the elevating rod 13 is engaged and held at a predetermined height position with respect to the support tube 11 and the height can be adjusted by disengaging the engagement member 17 by the displacement of the operation member 17. A vertical hole 18 is formed in the central portion of the side surface 11A and projecting inwardly over substantially the entire length in the vertical direction, and at the front edge of the vertical hole 18 at regular intervals. .. Are formed, and the central portion of the operating rod 20 constituting the operating member 17 is pivoted by the support shaft 21 at the upper and lower central portion of the side surface of the lifting rod 13 opposite to the engaging concave portion 19. The end portion of the engagement pin 24 that passes through the vertical hole 18 and the horizontal elongated hole 23 formed in the lower part of the lifting rod 13 in the downward U-shaped groove 22 formed at the lower end of the operation rod 20 Is located. The engaging pin 24 has a shaft portion 24A having a diameter slightly smaller than the width of the vertical hole 18 and has a head portion 24B that does not pass through the vertical hole 18 at one end and an outer periphery of the U-shaped groove 22 at the other end. A fitting groove 24 </ b> C is formed in which an E-ring 25 for stopping and retaining is fitted. Here, a working opening 26 for fitting an E-ring 25 to the engagement pin 24 is formed in the upper part of the other side surface 11B of the support tube 11. Further, an insertion hole 27 is formed in the cap 12 so as to be continuous with the sliding hole 14 so that the operation rod 20 can be inserted and the operation rod 20 can be displaced back and forth.
[0011]
Here, the support tube 11 is a cylindrical member having a rectangular cross section in the present embodiment, but is a cylindrical member having a substantially C-shaped cross section in which the working opening 26 of the other side surface 11B is formed in the entire length. May be. Further, the vertical hole 18 and the engagement recesses 19 are formed along the center of both side surfaces 11A and 11B of the cylindrical support tube 11 having a rectangular cross section, and the elevating rod 13 is substantially U-shaped in cross section. In the slit-like groove between the opposing plates, the same operating rod 20 is pivotably mounted, and the horizontally elongated holes 23 are formed in the opposing plates of the lifting / lowering rod 13 in the same manner as described above. The engagement pin 24 may be disposed through the vertical holes 18 and 18 and the horizontally long holes 23 and 23 and the U-shaped groove 22 of the operation rod 20. The support tube 11 is internally fitted and fixed to a rectangular tube portion at the upper end of the support arm 7.
[0012]
In this height adjustment mechanism, the upper end of the operating rod 20 as the operating member 17 is displaced back and forth, whereby the lower end is displaced back and forth around the support shaft 21 and engaged with the U-shaped groove 22. The joint pin 24 moves in the horizontally long hole 23, the height adjustment state (see FIG. 3) where the engagement pin 24 is located in the vertical hole 18, and the height maintenance state where the engagement pin 24 is engaged with the engagement recess 19. (See FIG. 2). Here, it is also preferable that the engagement pin 24 is elastically urged directly or indirectly by a spring body such as a kick spring in a direction in which the engagement pin 24 is engaged with the engagement recess 19.
[0013]
Next, the horizontal angle adjustment mechanism of the armrest portion 6 will be described with reference to FIGS. 2 to 5 and FIGS. In the present embodiment, the structure in which the horizontal angle can be adjusted by swinging the front part left and right with respect to the rear part with respect to the rear part in the horizontal plane is illustrated. It is also possible to adjust the horizontal angle by shaking, and in that case, the structure described later may be reversed.
[0014]
The armrest portion 6 has a structure in which the movable member 10 is overlapped on the fixed member 9 fixed in the front-rear direction on the upper end of the lifting / lowering rod 13 from above, and the rear portion of the movable member 10 is placed on the rear portion of the fixed member 9. In addition to being connected to be rotatable and slidable back and forth, the fixed member 9 and the front portion of the movable member 10 can be engaged with each other. Specifically, the fixing member 9 is a member extending in the front-rear direction. In the rear part, a circular hole 28 that opens to the rear end and extends forward is formed, and the circular hole that opens to the upper surface of the rear part is formed. A slit groove 29 communicated with 28 is formed, and an engaging projection 30 is provided at the center of the front end. The diameter of the circular hole 28 is set larger than the lateral width of the slit groove 29. On the other hand, the movable member 10 is a plate-like member having a width wider than that of the fixed member 9, and a cylindrical portion penetrating the slit portion 29 and a ball portion 31 slidably fitted into the circular hole 28 on the lower surface of the rear portion. A shaft member 33 having a portion 32 and a slidable and slidable projection is provided, and the lower surface of the front end portion is projected downward in a stepped manner, and the rear edge of the projecting portion 34 is formed with a circumference around the shaft member 33. Along with the arc surface 35, a plurality of engagement grooves 36 that open to the arc surface 35 and extend radially forward about the shaft member 33 are provided on the left and right sides at predetermined intervals. If the projecting portion 34 is further extended downward and the lower portion thereof is extended rearward to receive the front portion of the fixed member 9, when the front portion of the movable member 10 is lifted, the shaft This is preferable because an excessive force is not applied to the member 33.
[0015]
Then, the spherical member 31 of the shaft member 33 is inserted into the circular hole 28 and the cylindrical member 32 is inserted into the slit groove 29 to superpose the movable member 10 on the upper surface of the fixed member 9. Further, a compression coil spring 37 is interposed between the inner end of the circular hole 28 and the shaft member 33, and the movable member 10 is elastically biased backward with respect to the fixed member 9, The engaging groove 36 of the movable member 10 is engaged with the engaging protrusion 30 of the fixed member 9. Further, the upper end portion of the operating rod 20 protruding upward from the side of the fixed member 9 is accommodated in an arc groove 38 provided in the movable member 10. Here, the arc groove 38 is formed along a circumference centered on the shaft member 33.
[0016]
The movable member 10 is covered with a synthetic resin decorative cover 39 that forms the outer shape of the armrest portion 6, and the support tube 11 and the elevating rod 13 are divided into two parts whose upper ends are fixed to the fixing member 9. The decorative cover 40 is covered with a synthetic resin decorative cover 40, and a lower part of the decorative cover 40 is slidably fitted to the upper part of the support arm 7.
[0017]
Here, in a normal state, the movable member 10 is in the rearmost position by the elastic biasing force of the compression coil spring 37, and the engagement protrusion 30 of the fixed member 9 is in any engagement groove 36 of the movable member 10. They are engaged (see FIG. 2). When the movable member 10 is slid forward with respect to the fixed member 9 while compressing the compression coil spring 37, the engagement groove 36 is detached from the engagement protrusion 30, and the shaft member 33 is movable. The member 10 can be rotated left and right, and after setting to a predetermined angle, the movable member 10 is slid backward by the elastic biasing force of the compression coil spring 37 to engage the engagement groove 36 with the engagement protrusion 30. Thus, the set angle is maintained. Further, when the armrest portion 6 (the decorative cover 39), that is, the movable member 10 is slid forward, the upper end portion of the operating rod 20 positioned in the arc groove 38 is pushed forward to center the support shaft 21. As a result, the lower end portion of the operating rod 20 moves rearward, and the engagement pin 24 is disengaged from the engagement recess 19 and positioned in the vertical hole 18 (see FIG. 3). In this state, by raising or lowering the armrest portion 6, that is, the front portion of the movable member 10, the elevation body 8 can be adjusted in the vertical height with respect to the support arm 7. When the armrest portion 6, that is, the movable member 10 is moved rearward by the elastic biasing force of the compression coil spring 37, the engagement protrusion 30 is engaged with any of the engagement grooves 36. At the same time as the set angle is maintained, the engagement pin 24 engages with any of the engagement recesses 19 to maintain the set height.
[0018]
In addition, the thing of the structure which moves the armrest part 6 back and cancels | releases the engagement of a height adjustment mechanism, when getting up from the state leaning on the backrest part 3, and also when standing up from a chair, Since it involves the action of pulling the 6 backward with force, the engagement may be released unexpectedly, so the armrest 6 is moved forward to disengage the height adjustment mechanism and horizontal angle adjustment mechanism. A structure is preferred.
[0019]
【The invention's effect】
The armrest device for a chair according to the present invention as described above is a series of simple operations such as holding the armrests on both sides with the respective hands and sliding them forward while the arm on the armrest is placed on the armrest portion. The height of the part and the angle in the horizontal direction can be adjusted. For example, it can be set to the height of the armrest suitable for operating a word processor or a computer keyboard placed on a tabletop, and the horizontal direction of the armrest according to the opening angle of the elbow when operating the keyboard or mouse The angle can be adjusted, and a comfortable support state of the arm from the elbow can be realized. Further, since no lever for adjusting the height and angle is provided and the armrest itself can be used like a conventional operation lever, the appearance is excellent. Furthermore, since the height adjustment mechanism is simple, reliable, and highly durable, it is possible to provide an armrest device that can optimally adjust the posture of the armrest portion while suppressing an increase in cost.
[Brief description of the drawings]
FIG. 1 is a side view of a chair to which an armrest device of the present invention is applied.
FIG. 2 is a longitudinal sectional view of a main part of an armrest device according to an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of an essential part showing a state in which the height can be adjusted when the armrest is moved forward.
FIG. 4 is an exploded perspective view of the same.
FIG. 5 is a perspective view of the main part in the assembled state.
6 is a cross-sectional view taken along line X1-X1 of FIG.
7 is a cross-sectional view taken along line X2-X2 of FIG.
FIG. 8 is an abbreviated plan view of an armrest portion.
FIG. 9 is an abbreviated vertical sectional view.
FIG. 10 is an exploded perspective view, similarly omitted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leg part 2 Seat part 3 Backrest part 4 Armrest apparatus 5 Support part 6 Armrest part 7 Support arm 8 Elevating body 9 Fixing member 10 Tilt member 11 Support pipe (support arm) 12 Cap 13 Elevating rod (elevating body) 14 Sliding Hole 15 Slider 16 Tension coil spring 17 Operation member 18 Vertical hole 19 Engagement recess 20 Operation rod (operation member)
21 Support shaft 22 U-shaped groove 23 Horizontally long hole 24 Engagement pin 25 E-ring 26 Work opening 27 Insertion hole 28 Circular hole 29 Slit groove 30 Engagement protrusion 31 Ball part 32 Column part 33 Shaft member 34 Projection part 35 Arc surface 36 Engagement groove 37 compression coil spring 38 arc groove 39 decorative cover 40 decorative cover

Claims

A chair armrest device in which the armrest portion can be adjusted in height and the horizontal angle can be adjusted with respect to the support portion standing up from the seat portion or the leg portion. A height adjustment mechanism that disengages and disengages engagement by displacement of the member is provided, and a movable member is stacked from above on a fixed member that is fixed to the upper end of the support portion in the front-rear direction. The rear portion is connected to be rotatable and slidable back and forth, and the engagement protrusion on the front end of the fixed member and the plurality of rearward engagement grooves arranged laterally on the front portion of the movable member by the rear elastic biasing force of the movable member And an angle adjustment mechanism that can be engaged with each other, the upper end portion of the operation member of the height adjustment mechanism is engaged in an arc groove formed at an appropriate position of the movable member of the angle adjustment mechanism, and the armrest portion is moved forward. Elastic biasing force Anti and with enabling the height adjustment and the horizontal angle adjustment by moving, armrest apparatus chair characterized by comprising maintaining the height and the set angle set by to return backward.