JP4220191B2 - Chair backrest device - Google Patents
Chair backrest device Download PDFInfo
- Publication number
- JP4220191B2 JP4220191B2 JP2002213812A JP2002213812A JP4220191B2 JP 4220191 B2 JP4220191 B2 JP 4220191B2 JP 2002213812 A JP2002213812 A JP 2002213812A JP 2002213812 A JP2002213812 A JP 2002213812A JP 4220191 B2 JP4220191 B2 JP 4220191B2
- Authority
- JP
- Japan
- Prior art keywords
- backrest
- cam groove
- end portion
- pivot
- rear end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】
【発明の属する技術分野】
本発明は、椅子における背凭れの後傾角度を、簡単に変化させうるようにした装置に関する。
【０００２】
【従来の技術】
椅子において、その使用目的に応じて、背凭れの後傾角度を変化させたいという要求は一般的である。
そのための簡単な手段として、背凭れの上部を、左右軸まわりに回動しうるようにして、背凭れフレームに支持し、背凭れの下部を、様々の手段により、前後に移動させるようにしたものがある(例えば特許文献１または２参照)。
【特許文献１】
実公昭４６−８４４７号公報
【特許文献２】
実開昭６０−４２６２号公報
【０００３】
【発明が解決しようとする課題】
背凭れの上部を、背凭れ支持フレームに左右軸まわりに回動しうるようにした椅子において、背凭れの下部を前後に移動させるための上記のような従来の手段は、構成が複雑で、寸法が大きく、操作が面倒であるとともに、体裁が必ずしも良くなかった。
【０００４】
本発明は、上述したような従来の問題点を解消し、きわめて簡単かつ小型で、体裁良好であるとともに、操作が容易かつ確実な、背凭れ下部の前後位置調節装置を備える椅子の背凭れ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 ) 背凭れの下部に、側面視Ｌ字状の一定幅のカム溝を設けるとともに、このカム溝の上端部と中央部、および中央部と後端部に亘って摺動しうるように嵌合した支軸と枢軸を、操作レバーと一体をなす傾動片に枢支し、かつ前記カム溝の後端部に位置する枢軸を、背凭れの上部を左右軸まわりに回動可能に取り付けた背凭れ支持フレームの下部に支持する。
【０００６】
( ２ ) 上記( １ )項において、カム溝の上端部と、後端部に、それぞれ、支軸および枢軸を保持するための弾性係合把持片を設ける。
【０００７】
( ３ ) 上記( ２ )項において、支軸および枢軸に抜け出し抵抗を与えるために、弾性係合把持片の先端部をやや幅広とする。
【０００８】
( ４ ) 上記( ２ )項または( ３ )項において、カム溝の外側方において、その上端部と後端部の間に、内端がカム溝と連通する肉抜孔を設けることにより、この肉抜孔と前記カム溝の上端部および後端部の間に、弾性係合把持片を形成する。
【０００９】
( ５ ) 上記(１)〜( ４ )項のいずれかにおいて、枢軸の後方において、背凭れの前面に、ランバーサポートを設ける。
【００１０】
【発明の実施の形態】
図１は、本発明の背凭れ装置の一実施形態を備える椅子(１)を示し、背凭れ(２)の上部後面は、背凭れ支持フレーム(３)の上部に設けた左右方向の取付軸(４)をもって枢支されている。
【００１１】
背凭れ(２)の左右両側部の後面下部には、それぞれ、側面視Ｌ字状のカム溝(５)を有する案内片(６)が固着されている。
カム溝(５)は、図４に明示するように、上端部(７)および後端部(８)が半円形をなす一定幅のものである。
【００１２】
カム溝(５)の上端部(７)の後方で、かつ後端部(８)の上方におけるほぼ等距離の位置に、内端がカム溝(５)と連通する円形の肉抜孔(９)を設けることにより、カム溝(５)の上端部(７)の後側、および後端部(８)の上側に、それぞれ、先端がやや広幅となった弾性係合把持片(10)(11)が形成されている。
【００１３】
操作レバー(12)と一体をなす傾動片(13)の前端および後端に設けた左右方向の支軸(14)および枢軸(15)の中、後部の枢軸(15)を、背凭れ支持フレーム(３)の下部より前向突設した支杆(16)の先端に枢支してある。
【００１４】
なお、図には表われていないが、上記カム溝(５)および傾動片(13)は、背凭れ(２)の後部両側に設けられ、かつ左右の支軸(14)もしくは枢軸(15)を連結する連結杆をもって、左右の傾動片(13)を、同時に等量傾動させるようにしてある。
【００１５】
上記案内片(６)の後方において、背凭れ(２)の前面下部には、前向きに凸曲するランバーサポート(17)が設けられている。上記構成であるから、操作レバー(12)をもって傾動片(13)を前後に傾動させることにより、図２に示すように、枢軸(15)を、カム溝(５)の中央部、すなわちその上端部(７)の直下へ移動させたり、あるいはカム溝(５)の後端部(８)へ移動させたりすることができる。
これにより、枢軸(15)と背凭れ(２)との距離は変化させられ、背凭れ(２)の後傾角度は変えられる。
【００１６】
【発明の効果】
各請求項に記載の発明の効果は、次の如くである。
請求項１：操作レバーをもって傾動片を回動させることにより、背凭れの傾斜を簡単に変えることができる。
すなわち、きわめて簡単かつ小型で、体裁良好であるとともに、操作が容易かつ確実な、背凭れ下部の前後位置調節装置を備える椅子の背凭れ装置を提供することができる。
【００１７】
請求項２：背凭れを、傾斜状態で安定よく保持することができる。
【００１８】
請求項３：背凭れを、抵抗を付与した状態で傾斜保持することができる。
【００１９】
請求項４：カム溝の上端部および後端部の側方に、弾性係合把持片を簡単に形成しうる。
【００２０】
請求項５：背凭れとともに、ランバーサポートも傾動する。
【図面の簡単な説明】
【図１】 本発明の背凭れ装置の一実施形態を備える椅子の側面図である。
【図２】 背凭れの傾斜が小さい場合における図１における要部の拡大縦断面図である。
【図３】 同じく傾斜が大きい場合における図２と同様の図である。
【図４】 案内片を略示する拡大側面図である。
【符号の説明】
(１)椅子
(２)背凭れ
(３)背凭れ支持フレーム
(４)取付軸
(５)カム溝
(６)案内片
(７)上端部
(８)後端部
(９)肉抜孔
(10)(11)弾性係合把持片
(12)操作レバー
(13)傾動片
(14)支軸
(15)枢軸
(16)支杆
(17)ランバーサポート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device that can easily change the back tilt angle of a backrest in a chair.
[0002]
[Prior art]
In a chair, there is a general demand for changing the back tilt angle of the backrest according to the purpose of use.
As a simple means for that purpose, the upper part of the backrest can be rotated around the left and right axis, supported by the backrest frame, and the lower part of the backrest is moved back and forth by various means. There are some (see, for example,
[Patent Document 1]
Japanese Utility Model Publication No. 46-8447 [Patent Document 2]
JitsuHiraku Akira 60-4262 Patent Publication No. [0003]
[Problems to be solved by the invention]
The backrest of the upper, in chair as may rotate about lateral axis backrest support frame, the conventional means as described above for moving the lower portion of the backrest around the configuration is complicated The size is large, the operation is troublesome, and the appearance is not always good.
[0004]
The present invention solves the conventional problems as described above, is very simple and small in size, has a good appearance, and is easy and reliable to operate. The purpose is to provide.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
( 1 ) A cam groove having a constant width L-shaped in a side view is provided in the lower part of the backrest, and the cam groove can slide over the upper end portion and the central portion, and the central portion and the rear end portion. The fitted pivot and pivot are pivotally supported by a tilting piece that is integrated with the control lever, and the pivot located at the rear end of the cam groove is mounted so that the upper part of the backrest can be rotated around the left and right axes. Support the lower part of the back support frame.
[0006]
( 2 ) In the above item ( 1 ) , the upper end portion and the rear end portion of the cam groove are provided with elastic engagement gripping pieces for holding the support shaft and the pivot shaft, respectively.
[0007]
( 3 ) In the above item ( 2 ) , the tip of the elastic engagement gripping piece is made slightly wider in order to provide resistance to the support shaft and the pivot.
[0008]
( 4 ) In the above item ( 2 ) or ( 3 ) , the outer side of the cam groove is provided with a hollow hole whose inner end communicates with the cam groove between its upper end and rear end. An elastic engagement grip piece is formed between the punched hole and the upper end portion and the rear end portion of the cam groove.
[0009]
( 5 ) In any one of the above items (1) to ( 4 ) , a lumbar support is provided in front of the backrest behind the pivot.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a chair (1) provided with an embodiment of the backrest device of the present invention, and the upper rear surface of the backrest (2) is a left-right mounting shaft provided on the backrest support frame (3). It is pivotally supported by (4).
[0011]
Guide pieces (6) each having an L-shaped cam groove (5) in a side view are fixed to the lower rear portions of the left and right sides of the backrest (2).
As clearly shown in FIG. 4, the cam groove (5) has a constant width in which the upper end portion (7) and the rear end portion (8) form a semicircular shape.
[0012]
A circular hollow hole (9) whose inner end communicates with the cam groove (5) at an approximately equidistant position behind the upper end (7) of the cam groove (5) and above the rear end (8). Are provided on the rear side of the upper end portion (7) of the cam groove (5) and the upper side of the rear end portion (8), respectively, and the elastic engagement gripping pieces (10) (11 ) Is formed.
[0013]
The back pivot (15) of the left and right pivots (14) and pivot (15) provided at the front end and rear end of the tilting piece (13) integral with the control lever (12) It is pivotally supported at the tip of a support (16) projecting forward from the lower part of (3).
[0014]
Although not shown in the figure, the cam groove (5) and the tilting piece (13) are provided on both sides of the back of the backrest (2), and the left and right support shafts (14) or pivots (15). The left and right tilting pieces (13) are tilted at the same time by a connecting rod for connecting the two.
[0015]
Behind the guide piece (6), a lumbar support (17) that curves forward is provided at the lower part of the front surface of the backrest (2). Since it is the said structure, by tilting a tilting piece (13) back and forth with an operating lever (12), as shown in FIG. 2, a pivot (15) is made into the center part of a cam groove (5), ie, the upper end. It can be moved directly below the portion (7) or moved to the rear end (8) of the cam groove (5).
As a result, the distance between the pivot (15) and the backrest (2) is changed, and the backward tilt angle of the backrest (2) is changed.
[0016]
【The invention's effect】
The effects of the invention described in each claim are as follows.
Claim 1: The tilt of the backrest can be easily changed by rotating the tilting piece with the operation lever.
That is, it is possible to provide a backrest device for a chair provided with a front / rear position adjustment device for a lower backrest that is extremely simple and small, has a good appearance, and is easy and reliable to operate.
[0017]
Claim 2 : The backrest can be stably held in an inclined state.
[0018]
Claim 3 : The backrest can be tilted and held in a state where resistance is applied.
[0019]
Claim 4: on the side of the top end and the rear end portion of the cam groove, can easily form an elastic engagement gripping piece.
[0020]
Claim 5 : The lumbar support tilts with the backrest.
[Brief description of the drawings]
FIG. 1 is a side view of a chair provided with an embodiment of a backrest device of the present invention.
FIG. 2 is an enlarged longitudinal sectional view of the main part in FIG. 1 when the inclination of the backrest is small.
FIG. 3 is a view similar to FIG. 2 when the inclination is also large.
FIG. 4 is an enlarged side view schematically showing a guide piece.
[Explanation of symbols]
(1) Chair
(2) Backrest
(3) Back support frame
(4) Mounting shaft
(5) Cam groove
(6) Guide piece
(7) Upper end
(8) Rear end
(9) Meat hole
(10) (11) Elastic engagement gripping piece
(12) Control lever
(13) Tilt piece
(14) Spindle
(15) Axis
(16) Support
(17) Lumber support
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002213812A JP4220191B2 (en) | 2002-07-23 | 2002-07-23 | Chair backrest device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002213812A JP4220191B2 (en) | 2002-07-23 | 2002-07-23 | Chair backrest device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004049719A JP2004049719A (en) | 2004-02-19 |
| JP4220191B2 true JP4220191B2 (en) | 2009-02-04 |
Family
ID=31936310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002213812A Expired - Fee Related JP4220191B2 (en) | 2002-07-23 | 2002-07-23 | Chair backrest device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4220191B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9402478B2 (en) | 2011-07-15 | 2016-08-02 | Itoki Corporation | Rocking chair and spring unit used therein |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5031288B2 (en) | 2006-07-24 | 2012-09-19 | 株式会社岡村製作所 | Chair backrest device |
| JP5347141B2 (en) | 2008-01-16 | 2013-11-20 | コクヨ株式会社 | Chair |
| JP6041478B2 (en) * | 2011-07-15 | 2016-12-07 | 株式会社イトーキ | Chair |
| KR101547268B1 (en) * | 2014-09-03 | 2015-08-26 | 성용기업 주식회사 | A chair |
-
2002
- 2002-07-23 JP JP2002213812A patent/JP4220191B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9402478B2 (en) | 2011-07-15 | 2016-08-02 | Itoki Corporation | Rocking chair and spring unit used therein |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004049719A (en) | 2004-02-19 |
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