JP2005131047A - Backrest tilting apparatus - Google Patents
Backrest tilting apparatusInfo
- Publication number
- JP2005131047A JP2005131047A JP2003369600A JP2003369600A JP2005131047A JP 2005131047 A JP2005131047 A JP 2005131047A JP 2003369600 A JP2003369600 A JP 2003369600A JP 2003369600 A JP2003369600 A JP 2003369600A JP 2005131047 A JP2005131047 A JP 2005131047A
- Authority
- JP
- Japan
- Prior art keywords
- backrest
- seat
- seated person
- spiral spring
- tilting
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
- B60N2/2227—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable and provided with braking systems
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
- A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
- A47C7/444—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs of torsion type
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chairs Characterized By Structure (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
Description
本発明は、背凭れ傾動装置に関する。さらに詳述すると、本発明は、椅子や乗物用座席の背凭れを座に対して傾動可能に接続する背凭れ傾動装置の構造に関する。 The present invention relates to a back tilting device. More specifically, the present invention relates to a structure of a backrest tilting device that connects a backrest of a chair or a vehicle seat so as to be tiltable with respect to the seat.
従来、背凭れが座に対して傾動可能に連結されたロッキング椅子や乗物用座席においては、特許文献１〜３に開示される物のように、背凭れの回転中心を、転子点あるいはＨ点やヒップポイントなどと呼ばれる着座者の股関節軸の側面視上の点に、一致させる技術が提案されている。図７は、転子点Ｐ２を中心に、後方に回転すなわち後傾する前後の背凭れ１０１と着座者を示し、二点鎖線で描いた背凭れ１０１および着座者が後傾した後を示している。特許文献１〜３の技術では、背凭れ１０１の回転中心Ｃを、着座者の上半身が下半身に対して屈曲する点である転子点Ｐ２に一致させる若しくは転子点Ｐ２の近傍に設定することにより、背凭れ１０１の傾動と着座者の背中の動きとを同期化させ、背凭れ１０１が着座者の背中に接触しながらずれてしまうことを防ぎ、衣服に皺が寄ってしまう事や背中への不快感を軽減することを図っている。 Conventionally, in a rocking chair or a vehicle seat in which the backrest is connected so as to be tiltable with respect to the seat, the rotation center of the backrest is set at the trochanter point or H as in the objects disclosed in Patent Documents 1 to 3. A technique for matching a point on the side of the hip axis of a seated person called a point or hip point has been proposed. FIG. 7 shows the backrest 101 and the occupant before and after rotating backward, that is, tilting backward about the trochanter point P2, and showing the backrest 101 drawn by a two-dot chain line and after the occupant tilts backward. Yes. In the techniques of Patent Documents 1 to 3, the center of rotation C of the backrest 101 is set to coincide with the trochanter point P2, which is a point where the upper body of the seated person is bent with respect to the lower body, or in the vicinity of the trochanter point P2. Thus, the tilting of the backrest 101 and the movement of the back of the seated person are synchronized, and the backrest 101 is prevented from slipping while being in contact with the back of the seated person. To alleviate the discomfort.
しかしながら、特許文献１〜３に従い図７に示すように、背凭れ１０１の回転中心Ｃを転子点Ｐ２に一致させる場合、背凭れ１０１の背面側への傾動に従い着座者の体重を支える坐骨結節１０２が、転子点Ｐ２を中心に回転して、同図の符号１０２の二点鎖線の矢印で指し示すように、座面Ｓ１０１より更に下方且つ前方に移動しようとするため、坐骨結節１０２が座面Ｓ１０１に強く押しつけられて、着座者の臀部に強い負荷がかかり、着座者に不快感を与えてしまうことがある。さらに、坐骨結節１０２が座面Ｓ１０１に当たり、転子点Ｐ２回りの坐骨結節１０２の回転が座面Ｓ１０１により規制される結果、着座者の骨盤の後方回転が抑えられ、過度の腰椎前彎を助長して着座者の背骨が反った状態となってしまい、着座者の腰背部への負荷増加を誘発する虞がある。 However, as shown in FIG. 7 according to Patent Documents 1 to 3, when the rotation center C of the backrest 101 coincides with the trochanter point P2, the sciatic nodule that supports the weight of the seated person as the backrest 101 tilts toward the back side. 102 rotates around the trochanter point P2 and tries to move further downward and forward from the seating surface S101 as indicated by the two-dot chain line arrow 102 in FIG. When pressed strongly against the surface S101, a strong load is applied to the buttocks of the seated person, which may cause discomfort to the seated person. In addition, the sciatic nodule 102 hits the seating surface S101, and the rotation of the sciatic nodule 102 around the trochanteric point P2 is restricted by the seating surface S101. As a result, the spine of the seated person is warped, and there is a risk of inducing an increase in load on the back of the seated person.
また、傾動した背凭れを初期位置に復帰させるために、一般に圧縮コイルばねが用いられているが、この場合、背凭れの円弧運動をリンクを介して直線運動に変換して圧縮コイルばねに伝達する必要があるため、機構が複雑となり、部品点数や組立工数が多くなり、コスト高となる。また、背凭れが傾動するストロークを長くするといった要請に対応するためには、全長の長い圧縮コイルばねを用いる必要があり、機構が大型化してしまう問題がある。背凭れの円弧運動を直接的に利用するために、トーションバーを背凭れの回転軸に取り付けることも考えられるが、トーションバーは長手方向の長さを必要とするために、椅子の幅方向すなわち着座者の肩幅方向のスペースを大きくとる必要がある。さらに、圧縮コイルばねやトーションバーは、一般にばね定数が高く、ばねの変形に対する反力の立ち上がりが大きい。このため、ロッキングの感触が重く硬く感じられる傾向にある。このため、着座者の背に負担をかけてしまう虞がある。軽く柔らかいロッキング感覚を実現するために、ばね定数の小さいゴム材を背凭れの回転軸に取り付けることも考えられるが、この場合、金属材料等にゴム材を焼き付け等で一体化する必要があり、廃棄時において金属材料等とゴム材とを分別することが極めて困難で、環境的な問題がある。 In order to return the tilted backrest to the initial position, a compression coil spring is generally used, but in this case, the arc motion of the backrest is converted into a linear motion via a link and transmitted to the compression coil spring. Therefore, the mechanism becomes complicated, the number of parts and the number of assembly steps increase, and the cost increases. Moreover, in order to respond to the request | requirement of lengthening the stroke which a backrest tilts, it is necessary to use a compression coil spring with a long full length, and there exists a problem that a mechanism will enlarge. In order to directly use the arc motion of the backrest, it is conceivable to attach the torsion bar to the rotation axis of the backrest, but since the torsion bar requires a longitudinal length, the width direction of the chair, that is, It is necessary to take a large space in the shoulder width direction of the seated person. Furthermore, the compression coil spring and the torsion bar generally have a high spring constant and a large reaction force against the deformation of the spring. For this reason, the feeling of rocking tends to be heavy and hard. For this reason, there is a risk of placing a burden on the back of the seated person. In order to realize a light and soft rocking sensation, it is possible to attach a rubber material with a small spring constant to the rotating shaft of the backrest, but in this case, it is necessary to integrate the rubber material into a metal material etc. by baking, It is extremely difficult to separate the metal material or the like from the rubber material at the time of disposal, which causes an environmental problem.
そこで本発明は、背凭れの傾動時における着座者の臀部や腰背部への負担を軽減できる背凭れ傾動装置を提供することを目的とする。また本発明は、背凭れの傾動ストロークを長くする要請にも容易に対応でき、且つ軽く柔らかいロッキング感覚を備え、廃棄時における環境問題も解消した背凭れ傾動装置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a back tilting device that can reduce the burden on a seated person's buttocks and lower back when the back tilt is tilted. It is another object of the present invention to provide a back tilting device that can easily respond to a request to increase the tilt stroke of the backrest, has a light and soft rocking sensation, and eliminates environmental problems at the time of disposal.
かかる目的を達成するため、請求項１記載の発明は、背凭れを座に対して傾動可能に接続する背凭れ傾動装置において、背凭れの回転中心を、座の表面よりも上方もしくは側面視で座の表面と一致する位置、且つ初期位置にある背凭れの表面の縦中央において最も前方に位置する点よりも前方であって、尚且つ座に座る着座者の転子点よりも座の表面に近い側で且つ背凭れの表面に近い側に設定するようにしている。 In order to achieve such an object, the invention according to claim 1 is a backrest tilting device for connecting the backrest to the seat so that the backrest can be tilted, and the rotation center of the backrest is set above the seat surface or in a side view. The surface of the seat that coincides with the surface of the seat and that is in front of the most forward point in the longitudinal center of the backrest surface in the initial position and that is more than the trochanter point of the seated occupant The side closer to the back and the side closer to the backrest surface are set.
着座者の坐骨結節上における座面に最も近接する点である坐骨結節点は、着座者の転子点よりも座面寄り且つ背凭れ面寄りに位置している。したがって、背凭れの回転中心は、転子点までの距離よりも坐骨結節点までの距離の方が短くなる位置、換言すれば坐骨結節点の近傍もしくは坐骨結節点と一致する位置に設定されることとなる。従って、背凭れの傾動に追従して回転する着座者の坐骨結節を、座面の下方へと沈み込ませないように、座面上で自然に回転させることができる。これにより、着座者の体重を支える坐骨結節が座面に強く押しつけられることを防いで、着座者の臀部への負荷を軽減することができる。また、坐骨結節が座面上で自然に回転するため、着座者の背中が倒れるに従って、着座者の骨盤も坐骨結節点を支点として自然に後方に回転する。従って、過度の腰椎前彎を防いで、即ち着座者の背骨が反った状態となってしまうことを防いで、着座者の腰背部への負荷をも軽減することができる。 The sciatic nodal point, which is the point closest to the seating surface on the sciatic nodule of the seated person, is located closer to the seating surface and backrest than the trochanter point of the seated person. Therefore, the center of rotation of the backrest is set at a position where the distance to the sciatic nodule becomes shorter than the distance to the trochanter, in other words, in the vicinity of the sciatic nodule or a position coincident with the sciatic nodule. It will be. Therefore, the sciatic nodule of the seated person that rotates following the tilting of the backrest can be naturally rotated on the seating surface so as not to sink below the seating surface. Accordingly, it is possible to prevent the sciatic tuber that supports the weight of the seated person from being strongly pressed against the seating surface, thereby reducing the load on the seated person's buttocks. Also, since the sciatic nodule rotates naturally on the seating surface, the pelvis of the seated person naturally rotates backward with the sciatic nodule as a fulcrum as the seated person's back falls. Therefore, it is possible to prevent excessive lumbar lordosis, that is, to prevent the seated person's spine from being warped, and to reduce the load on the seated person's back.
また、請求項２記載の発明は、請求項１記載の背凭れ傾動装置において、座の両側から上方に延びる２つの座側アームと、背凭れの両側から前方に延びる２つの背側アームとを、それぞれ背凭れの回転中心を成す回り対偶で接続するようにしている。 According to a second aspect of the present invention, in the back tilting device according to the first aspect, the two seat side arms extending upward from both sides of the seat and the two back side arms extending forward from both sides of the backrest are provided. Each of them is connected with a pair of rotations that form the center of rotation of the backrest.
この場合、座と背凭れの間に例えば滑り対偶や複数の回り対偶等を有する複雑なリンク機構を設ける必要は無く、構成を簡素化できコンパクトにできる。これにより、デザインの自由度を高めることができ、座面を低く設定することも可能になる。 In this case, there is no need to provide a complicated link mechanism having, for example, a sliding pair or a plurality of turning pairs between the seat and the backrest, and the configuration can be simplified and made compact. Thereby, the freedom degree of design can be raised and it becomes possible to set a seat surface low.
また、請求項３記載の発明は、請求項２記載の背凭れ傾動装置において、座側アームと背側アームとの接続部分に、傾動する背凭れに対し該背凭れを初期位置に復帰させる方向への力を作用させる反力装置を組み込むようにしている。 According to a third aspect of the present invention, in the back tilting device according to the second aspect, the backrest is returned to the initial position with respect to the tilting backrest at the connecting portion between the seat side arm and the back arm. It incorporates a reaction force device that applies force to
この場合、座側アームと背側アームとの接続部分に反力装置が収まるので、座の下方や背凭れの裏側等に反力装置のスペースを設ける必要が無く、構成をよりコンパクトにでき、デザインの自由度をより高めることができ、座面をより低く設定することも可能になる。 In this case, since the reaction force device fits in the connection part between the seat side arm and the back side arm, there is no need to provide a space for the reaction force device below the seat or on the back side of the backrest, and the configuration can be made more compact, The degree of freedom in design can be increased, and the seating surface can be set lower.
また、請求項４記載の発明は、請求項３記載の背凭れ傾動装置において、反力装置は、一端が座側アームに取り付けられると共に他端が背側アームに取り付けられる渦巻ばねを有するものとしている。 According to a fourth aspect of the present invention, in the back tilting device according to the third aspect, the reaction force device includes a spiral spring having one end attached to the seat side arm and the other end attached to the back side arm. Yes.
渦巻ばねは、巻き締めることによりばね力を発生させるため、背凭れの座に対する円弧運動による回転モーメントを直接的に利用して、背凭れを初期位置に復帰させる方向への反力を渦巻ばねに蓄積させることができる。さらに、渦巻ばねは、渦巻状を成すが故に、トーションバーや捩じりコイルばね等のように一方向に突出することがない。従って空間占有率を抑えつつ目的のばね力を得ることができる。しかも、渦巻ばねは、コンパクトでありながら即ち空間占有率が小さいにもかかわらず、圧縮コイルばねやトーションバー等と比較して、変位可能な範囲が大きい。従って、コンパクトな構成として尚且つ背凭れの傾動のストロークを大きくとることも可能となる。加えて、渦巻ばねは、ばね定数が圧縮コイルばねやトーションバー等と比較して小さい。換言すれば、渦巻ばねは、変位の増加すなわち背凭れの傾動角度の増加に対する反力の増加が小さく、ほぼ一定の反力を発生させる。したがって、あたかもゴム材を用いた場合のように、着座者の背に負担がかからない軽く柔らかい快適なロッキング感覚を実現することができる。 Since the spiral spring generates a spring force by tightening it, the reaction force in the direction to return the backrest to the initial position is directly applied to the spiral spring by directly using the rotational moment due to the arc motion with respect to the seat of the backrest. Can be accumulated. Furthermore, since the spiral spring has a spiral shape, it does not protrude in one direction like a torsion bar or a torsion coil spring. Therefore, the desired spring force can be obtained while suppressing the space occupancy. Moreover, although the spiral spring is compact, that is, although the space occupancy is small, the range in which the spiral spring can be displaced is larger than that of a compression coil spring, a torsion bar, or the like. Therefore, it is possible to make the backrest tilt stroke larger as a compact configuration. In addition, the spiral spring has a smaller spring constant than a compression coil spring, a torsion bar, or the like. In other words, the spiral spring generates a substantially constant reaction force with a small increase in the reaction force against an increase in displacement, that is, an increase in the tilt angle of the backrest. Therefore, it is possible to realize a light, soft and comfortable rocking feeling that does not put a burden on the back of the seated person as if a rubber material is used.
しかして請求項１記載の背凭れ傾動装置によれば、背凭れの回転中心を、座の表面よりも上方もしくは側面視で座の表面と一致する位置、且つ初期位置にある背凭れの表面の縦中央において最も前方に位置する点よりも前方であって、尚且つ座に座る着座者の転子点よりも座の表面に近い側で且つ背凭れの表面に近い側に設定しているので、換言すれば転子点までの距離よりも坐骨結節点までの距離の方が短くなる位置、さらに換言すれば坐骨結節点の近傍もしくは坐骨結節点と一致する位置に、背凭れの回転中心を設定しているので、着座者の体重を支える坐骨結節が座面に強く押しつけられることを防いで、着座者の臀部への負荷を軽減することができ、且つ着座者の背骨が反った状態となってしまうことを防いで、着座者の腰背部への負荷をも軽減することができる。さらに、背凭れの傾動に応じて着座者の骨盤が自然に回転するため、背凭れの回転中心を転子点に一致させた場合と比較して、背凭れの傾動に伴う着座者の股関節の屈曲角度を若干増加でき、背凭れの傾動時に着座者により大きい開放感を与えることができる。逆に、背凭れの傾動範囲を小さくしても背凭れの傾動時に充分な開放感が得られる背凭れ傾動装置を提供でき、省スペース化にも寄与する。また、背凭れが着座者の背中に接触しながらずれてしまう量も小さくなるので、衣服に皺が寄ってしまう事を防ぐ等、背凭れの回転中心を転子点に一致させた場合と同等の効果も得られる。 Thus, according to the back tilting device of the first aspect, the center of rotation of the backrest is positioned above the surface of the seat or at a position coinciding with the surface of the seat in a side view and the surface of the backrest in the initial position. Because it is set ahead of the point located at the forefront in the longitudinal center, and closer to the seat surface than the trochanter point of the seated occupant, and closer to the backrest surface. In other words, the center of rotation of the backrest is located at a position where the distance to the sciatic nodule becomes shorter than the distance to the trochanter, in other words, in the vicinity of the sciatic nodule or a position coincident with the sciatic nodule. Since it is set, the sciatic tuber that supports the weight of the seated person can be prevented from being strongly pressed against the seating surface, the load on the seated person's buttocks can be reduced, and the seated person's spine is warped To prevent the seated person's waist and back It is possible to also reduce the load. Furthermore, since the pelvis of the seated person rotates naturally according to the tilting of the backrest, the hip joint of the seated person accompanying the tilting of the backrest is compared with the case where the center of rotation of the backrest matches the trochanter point. The bending angle can be slightly increased, and a greater sense of openness can be given to the seated person when the backrest is tilted. On the contrary, even if the tilting range of the backrest is reduced, it is possible to provide a backrest tilting device that can provide a sufficient open feeling when tilting the backrest, which contributes to space saving. In addition, since the amount of the backrest that shifts while contacting the seated person's back is reduced, it is equivalent to the case where the center of rotation of the backrest is made to coincide with the trochanter point, such as preventing the clothes from leaning. The effect of can also be obtained.
さらに、請求項２記載の背凭れ傾動装置によれば、座の両側から上方に延びる２つの座側アームと、背凭れの両側から前方に延びる２つの背側アームとを、それぞれ背凭れの回転中心を成す回り対偶で接続するようにしているので、座と背凭れの間に例えば滑り対偶や複数の回り対偶等を有する複雑なリンク機構を設ける必要は無く、構成を簡素化できコンパクトにでき、デザインの自由度を高め、座面を低く設定することも可能になる。 Further, according to the backrest tilting device of the second aspect, the two backside arms extending upward from both sides of the seat and the two backside arms extending forward from both sides of the backrest are respectively rotated by the backrest. Since it is connected with a pair of turning pairs that form the center, it is not necessary to provide a complicated link mechanism having, for example, a sliding pair or a plurality of turning pairs between the seat and the backrest, and the configuration can be simplified and made compact. It also becomes possible to increase the degree of freedom of design and to set the seating surface low.
さらに、請求項３記載の背凭れ傾動装置によれば、座側アームと背側アームとの接続部分に、傾動する背凭れに対し該背凭れを初期位置に復帰させる方向への力を作用させる反力装置を組み込んでいるので、座の下方や背凭れの裏側等に反力装置のスペースを設ける必要が無く、構成をよりコンパクトにでき、デザインの自由度をより高め、座面をより低く設定することも可能になる。 According to the third aspect of the present invention, a force is applied to the connecting portion between the seat side arm and the back arm so that the backrest is returned to the initial position with respect to the tilting backrest. Since a reaction force device is incorporated, there is no need to provide a space for the reaction force device below the seat or on the back side of the backrest, making the structure more compact, increasing the degree of design freedom, and lowering the seat surface. It can also be set.
さらに、請求項４記載の背凭れ傾動装置によれば、反力装置は、一端が座側アームに取り付けられると共に他端が背側アームに取り付けられる渦巻ばねを有しているので、背凭れの座に対する円弧運動による回転モーメントを直接的に利用して、背凭れを初期位置に復帰させる方向への反力を渦巻ばねに蓄積させることができ、機構の単純化、部品点数および組立工数の削減、ひいてはコスト低減に寄与する。さらに、渦巻ばねは、トーションバーや捩じりコイルばね等のように一方向に突出することがないので、空間占有率を抑えつつ目的のばね力を得ることができる。しかも、渦巻ばねは、コンパクトでありながら圧縮コイルばねやトーションバー等と比較して変位可能な範囲が大きいので、コンパクトな構成として尚且つ背凭れの傾動のストロークを大きくとることも可能となる。加えて、渦巻ばねは、ばね定数が圧縮コイルばねやトーションバー等と比較して小さいので、背凭れの傾動角度の増加に対する反力の増加が小さく、ほぼ一定の反力を発生させる。したがって、あたかもゴム材を用いた場合のように、着座者の背に負担がかからない軽く柔らかい快適なロッキング感覚を実現することができる。しかも、廃棄する場合等に、金属材料等と一体化されたゴム材を分別するといった手間や問題はない。 Furthermore, according to the back tilting device of claim 4, the reaction force device has a spiral spring having one end attached to the seat side arm and the other end attached to the back side arm. By directly using the rotational moment due to the arc motion on the seat, the reaction force in the direction to return the backrest to the initial position can be accumulated in the spiral spring, simplifying the mechanism, reducing the number of parts and assembly man-hours As a result, it contributes to cost reduction. Further, since the spiral spring does not protrude in one direction unlike a torsion bar or a torsion coil spring, a desired spring force can be obtained while suppressing space occupancy. Moreover, since the spiral spring is compact but has a large range of displacement compared to a compression coil spring, a torsion bar, and the like, it is possible to make the backrest tilt stroke larger as a compact configuration. In addition, since the spring constant of the spiral spring is smaller than that of a compression coil spring, a torsion bar, or the like, the increase in the reaction force with respect to the increase in the tilt angle of the backrest is small, and an almost constant reaction force is generated. Therefore, it is possible to realize a light, soft and comfortable rocking feeling that does not put a burden on the back of the seated person as if a rubber material is used. Moreover, there is no trouble or problem of separating the rubber material integrated with the metal material or the like when it is discarded.
以下、本発明の構成を図面に示す実施形態に基づいて詳細に説明する。 Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.
図１から図６に本発明の背凭れ傾動装置の実施の一形態を示す。なお、本実施形態では、本発明の背凭れ傾動装置５を、ロッキング動作可能な事務用の回転椅子１に適用した場合について説明する。また、本明細書中で前方とは着座者の向く側を意味し、上方とは鉛直方向の上側を意味する。また、本実施形態では説明の便宜上、前方とその逆方向である後方とを結ぶ水平線が成す方向を前後方向とし、上方とその逆方向である下方とを結ぶ鉛直線が成す方向を上下方向とし、前後方向および上下方向に直交する方向を左右方向とする。 1 to 6 show an embodiment of the back tilting device of the present invention. In the present embodiment, a case will be described in which the back tilting device 5 of the present invention is applied to an office rotary chair 1 that can be locked. In the present specification, the front means the side facing the seated person, and the upper means the upper side in the vertical direction. Further, in the present embodiment, for convenience of explanation, the direction formed by the horizontal line connecting the front and the rear that is the opposite direction is the front-rear direction, and the direction formed by the vertical line connecting the upper and the lower direction is the vertical direction. The direction perpendicular to the front-rear direction and the up-down direction is the left-right direction.
背凭れ２を座３に対して傾動可能に接続する背凭れ傾動装置５を備える椅子１では、背凭れ２の回転中心Ｃを、着座者の臀部と接する座３の表面すなわち座面Ｓ１よりも上方もしくは側面視で座面Ｓ１と一致する位置、且つ着座者の背中と接する背凭れ２の表面すなわち背凭れ面Ｓ２の縦中央において最も前方に位置する点（以下、背凭れ点と呼ぶ）よりも前方であって、尚且つ座３に座る着座者の転子点Ｐ２よりも、座面Ｓ１寄りの側で且つ背凭れ面Ｓ２寄りの側に設定するようにしている。例えば本実施形態では図１に示すように、背凭れ２の回転中心Ｃから転子点Ｐ２までの距離よりも背凭れ２の回転中心Ｃから坐骨結節点Ｐ１までの距離の方が短くなる位置、換言すれば坐骨結節点Ｐ１の近傍、より具体的には坐骨結節点Ｐ１よりも若干後方かつ若干上方となる位置に、背凭れ２の回転中心Ｃを設定するようにしている。但し、図６に示すように、側面視上で坐骨結節点Ｐ１と一致する位置に背凭れ２の回転中心Ｃを設定するようにしても良い。ここで、坐骨結節点Ｐ１と一致させずその近傍に背凭れ２の回転中心Ｃを設定する場合は、回転中心Ｃを坐骨結節点Ｐ１の前方に設定するよりも、本実施形態のように坐骨結節点Ｐ１の後方に回転中心Ｃを設定することが望ましい。回転中心Ｃが坐骨結節点Ｐ１よりも前方にあると、背凭れ２を後傾させる際に坐骨結節４が座面Ｓ１より更に下方に移動しようとするため、坐骨結節４が座面Ｓ１に押しつけられて着座者の臀部に負荷がかかってしまうが、回転中心Ｃが坐骨結節点Ｐ１よりも後方にあれば、背凭れ２を後傾させる際に坐骨結節４が座面Ｓ１の上方に移動しようとするため、坐骨結節４が座面Ｓ１に強く押しつけられれることを防ぎ、着座者の臀部への負荷を軽減できるからである。 In the chair 1 provided with the backrest tilting device 5 that connects the backrest 2 to the seat 3 so as to be tiltable, the center of rotation C of the backrest 2 is more than the surface of the seat 3 in contact with the seated person's buttocks, that is, the seat surface S1. From a position that coincides with the seating surface S1 when viewed from above or in a side view, and a frontmost point on the surface of the backrest 2 that is in contact with the back of the seated person, that is, the longitudinal center of the backrest surface S2 (hereinafter referred to as a backrest point). Is set further on the side closer to the seating surface S1 and closer to the backrest surface S2 than the trochanter point P2 of the seated person sitting on the seat 3. For example, in the present embodiment, as shown in FIG. 1, the position where the distance from the rotation center C of the backrest 2 to the sciatic node P1 is shorter than the distance from the rotation center C of the backrest 2 to the trochanter point P2. In other words, the rotation center C of the backrest 2 is set in the vicinity of the sciatic node P1, more specifically, at a position slightly behind and slightly above the sciatic node P1. However, as shown in FIG. 6, the rotational center C of the backrest 2 may be set at a position that coincides with the sciatic node P1 in a side view. Here, when the rotation center C of the backrest 2 is set near the sciatic node P1 without being coincident with the sciatic node P1, the sciatic bone is set as in the present embodiment rather than setting the rotation center C in front of the sciatic node P1. It is desirable to set the center of rotation C behind the node P1. If the center of rotation C is in front of the sciatic nodal point P1, the sciatic nodule 4 tries to move further downward than the seating surface S1 when the backrest 2 is tilted backward, so that the sciatic nodule 4 is pressed against the seating surface S1. If the center of rotation C is behind the sciatic nodal point P1, the sciatic nodule 4 will move above the seating surface S1 when the backrest 2 is tilted backward. Therefore, it is possible to prevent the sciatic nodule 4 from being strongly pressed against the seating surface S1, and to reduce the load on the seated person's buttocks.
ここで、坐骨結節点Ｐ１とは、着座者の坐骨結節４上における座面Ｓ１に最も近接する点であり、図１に示すように、着座者の転子点Ｐ２よりも座面Ｓ１寄り且つ背凭れ面Ｓ２寄りに位置している。平均的もしくは理想的な着座者の転子点Ｐ２が経験や統計等に基いて得られるように、平均的もしくは理想的な着座者の坐骨結節点Ｐ１も経験や統計等に基いて得ることは可能である。例えば、左右方向と直交する平面に椅子１を投影した場合、すなわち椅子１の側面視において、背凭れ２の回転中心Ｃを通る鉛直線が座３の中央縦断面すなわち座面Ｓ１の縦中央と接する点と、回転中心Ｃとの上下方向における距離を図１に示すようにａとし、初期位置にある背凭れ２の中央縦断面上で最も前方に位置する点である背凭れ点と、回転中心Ｃとの前後方向における距離を図１に示すようにｂとすると、ａは約０ｃｍ〜約７ｃｍ程度とすることが好ましく、ｂは約４ｃｍ〜約１２ｃｍ程度とすることが好ましい。尚、座面Ｓ１や背凭れ面Ｓ２は平面である必要は無く、人間工学や美的処理の観点等から適宜曲面形状等を採用して良い。例えば本実施形態の背凭れ面Ｓ２は、着座者の腰部に向かって突出する曲面形状を成しており、座面Ｓ１は図１中の破線で示すように着座者の臀部と対向する部分がやや窪んだ曲面形状を成している。 Here, the sciatic nodal point P1 is a point closest to the seating surface S1 on the seated person's sciatic nodule 4, and as shown in FIG. 1, is closer to the seating surface S1 than the trochanter point P2 of the seated person. It is located closer to the backrest surface S2. Just as the average or ideal trochanter point P2 of the seated person can be obtained based on experience and statistics, the average or ideal seated person sciatic nodal point P1 can also be obtained based on experience and statistics. Is possible. For example, when the chair 1 is projected on a plane orthogonal to the left-right direction, that is, in the side view of the chair 1, the vertical line passing through the rotation center C of the backrest 2 is the central longitudinal section of the seat 3, that is, the vertical center of the seat surface S1. The distance in the vertical direction between the contact point and the center of rotation C is a as shown in FIG. 1, and the backrest point, which is the most forward point on the central longitudinal section of the backrest 2 at the initial position, and the rotation When the distance in the front-rear direction with respect to the center C is b as shown in FIG. 1, a is preferably about 0 cm to about 7 cm, and b is preferably about 4 cm to about 12 cm. Note that the seating surface S1 and the backrest surface S2 do not have to be flat, and a curved surface shape or the like may be adopted as appropriate from the viewpoint of ergonomics or aesthetic processing. For example, the backrest surface S2 of the present embodiment has a curved shape protruding toward the seated person's waist, and the seating surface S1 has a portion facing the seated person's buttocks as shown by a broken line in FIG. It has a slightly depressed curved shape.
また、本実施形態では、座３の両側から座面Ｓ１よりも上方に延びる２つの座側アーム６と、背凭れ２の両側から背凭れ面Ｓ２よりも前方に延びる２つの背側アーム７とを、それぞれ背凭れ２の回転中心Ｃを成す回り対偶で接続するようにしている。リンク機構を介して背凭れ２と座３を連結し、上述した背凭れ２の回転中心Ｃとなる位置に仮想的な回転軸を設定し、当該仮想回転軸回りに背凭れ２を傾動させることも可能ではあるが、本実施形態のように構成することで、座３と背凭れ２の間に例えば滑り対偶や複数の回り対偶等を有する複雑なリンク機構を設ける必要は無く、椅子１の構成を簡素化できコンパクトにできる。これにより、椅子１のデザインの自由度を高めることができ、座面Ｓ１を低く設定することも可能になる。 Moreover, in this embodiment, the two seat side arms 6 extended above the seat surface S1 from both sides of the seat 3, and the two back side arms 7 extended from the both sides of the backrest 2 to the front side of the backrest surface S2; Are connected to each other by a pair of rotations that form the center of rotation C of the backrest 2. Connecting the backrest 2 and the seat 3 via a link mechanism, setting a virtual rotation axis at the position of the rotation center C of the backrest 2 described above, and tilting the backrest 2 around the virtual rotation axis However, by configuring as in the present embodiment, it is not necessary to provide a complicated link mechanism having, for example, a sliding pair or a plurality of turning pairs between the seat 3 and the backrest 2. The configuration can be simplified and made compact. Thereby, the freedom degree of design of the chair 1 can be raised and it becomes possible to set the seat surface S1 low.
本実施形態の背凭れ２は、例えば背凭れ面Ｓ２を形成する背凭れ本体２ａと、背凭れ本体２ａを背面側から支持するインナーシェル２ｂと、インナーシェル２ｂの背面を覆う背カバー２ｃとで構成される。各背側アーム７の一端側には固定部７ａが一体に設けられており、この固定部７ａが背凭れ２の下部にねじ止めで固定される。より具体的には図３に示すように、インナーシェル２ｂの下方裏側に取付板８を介して固定部７ａがボルトおよびナットにより締結され、当該締結後、図２に示すように、固定部７ａを覆い隠すように背カバー２ｃがインナーシェル２ｂに取り付けられる。図３中の符号９は、背側アーム７の固定部７ａをインナーシェル２ｂにねじ止めするための孔である。尚、背カバー２ｃには図示を省略する係止爪が一体形成されており、この係止爪をインナーシェル２ｂに設けた図示を省略する孔に嵌め込むことで、背カバー２ｃがインナーシェル２ｂに取り付けられるようにしている。各背側アーム７は、背凭れ２の下部の左右両側から左右方向外側に一旦延びた後、前方且つやや下方に向かって延びている。各背側アーム７の先端には、背側連結部７ｂが一体に設けられている。 The backrest 2 of this embodiment includes, for example, a backrest body 2a that forms a backrest surface S2, an inner shell 2b that supports the backrest body 2a from the back side, and a back cover 2c that covers the back surface of the inner shell 2b. Composed. A fixing portion 7 a is integrally provided on one end side of each back arm 7, and this fixing portion 7 a is fixed to the lower portion of the backrest 2 with screws. More specifically, as shown in FIG. 3, a fixing portion 7a is fastened by a bolt and a nut to the lower back side of the inner shell 2b via a mounting plate 8, and after the fastening, as shown in FIG. 2, the fixing portion 7a The back cover 2c is attached to the inner shell 2b so as to cover up. Reference numeral 9 in FIG. 3 is a hole for screwing the fixing portion 7a of the back arm 7 to the inner shell 2b. The back cover 2c is integrally formed with a locking claw (not shown). By fitting the locking claw into a hole (not shown) provided in the inner shell 2b, the back cover 2c is fitted into the inner shell 2b. It can be attached to. Each dorsal arm 7 extends from the left and right sides of the lower portion of the backrest 2 to the outside in the left-right direction, and then extends forward and slightly downward. A back side connecting portion 7 b is integrally provided at the tip of each back side arm 7.
また、本実施形態の座３は、例えば座面Ｓ１を形成する座本体３ａとこの座本体３ａを支持する座受部材３ｂとで構成される。座受部材３ｂの下面には脚軸１０の一端側が回転可能に取り付けられており、脚軸１０の他端側には、キャスタ１１を備える脚羽根１２が取り付けられている。座側アーム６は、座受部材３ｂに溶接等の固定手段で固定されるアームベース６ａと、アームベース６ａにねじ止めで固定される取付部６ｃと、取付部６ｃと一体に設けられた座側連結部６ｂとで構成されている。アームベース６ａは、座受部材３ｂの両側面から左右方向外側に一旦延びた後、上方かつやや後方に向かって延びている。アームベース６ａの各先端には、それぞれ座側連結部６ｂに固定された取付部６ｃが差し込まれてねじ止めで固定される。 Moreover, the seat 3 of this embodiment is comprised by the seat main body 3a which forms seat surface S1, and the seat receiving member 3b which supports this seat main body 3a, for example. One end side of the leg shaft 10 is rotatably attached to the lower surface of the seat receiving member 3b, and a leg blade 12 including a caster 11 is attached to the other end side of the leg shaft 10. The seat side arm 6 includes an arm base 6a fixed to the seat receiving member 3b by fixing means such as welding, a mounting portion 6c fixed to the arm base 6a by screwing, and a seat provided integrally with the mounting portion 6c. It is comprised by the side connection part 6b. The arm base 6a extends from the both side surfaces of the seat receiving member 3b to the outside in the left-right direction, and then extends upward and slightly rearward. An attachment portion 6c fixed to the seat side connecting portion 6b is inserted into each end of the arm base 6a and fixed with screws.
背側連結部７ｂと座側連結部６ｂとは、例えば同じ外径を有する円盤形状に形成されており、図２に示すように、背凭れ２の回転中心Ｃ回りに相対回転可能に嵌め合わせられている。そして本実施形態では、例えば図５に示すように、座側アーム６と背側アーム７との接続部分である座側連結部６ｂと背側連結部７ｂとに、傾動する背凭れ２に対し背凭れ２を初期位置に復帰させる方向への力を作用させる反力装置１３を組み込んでいる。この構成の場合、座側アーム６と背側アーム７との接続部分に反力装置１３が収まるので、座３の下方や背凭れ２の裏側等に反力装置１３のスペースを設ける必要が無く、椅子１の構成をよりコンパクトにでき、デザインの自由度をより高めることができ、座面Ｓ１をより低く設定することも可能になる。 The back side connecting portion 7b and the seat side connecting portion 6b are formed in a disk shape having the same outer diameter, for example, and are fitted so as to be relatively rotatable around the rotation center C of the backrest 2 as shown in FIG. It has been. In the present embodiment, for example, as shown in FIG. 5, the seat-side connecting portion 6 b and the back-side connecting portion 7 b, which are connecting portions of the seat-side arm 6 and the back-side arm 7, are tilted against the tilted backrest 2. A reaction force device 13 for applying a force in a direction to return the backrest 2 to the initial position is incorporated. In the case of this configuration, the reaction force device 13 is accommodated in the connecting portion between the seat side arm 6 and the back side arm 7, so there is no need to provide a space for the reaction force device 13 below the seat 3 or behind the backrest 2. The configuration of the chair 1 can be made more compact, the degree of freedom in design can be increased, and the seating surface S1 can be set lower.
さらに例えば本実施形態では、上記の反力装置１３に、一端が座側アーム６の座側連結部６ｂに取り付けられると共に他端が背側アーム７の背側連結部７ｂに取り付けられる渦巻ばね１４を用いている。渦巻ばね１４は、巻き締めることによりばね力を発生させるため、背凭れ２の座３に対する円弧運動による回転モーメントを直接的に利用して、背凭れ２を初期位置に復帰させる方向への反力を渦巻ばね１４に蓄積させることができる。このため、背凭れ２の座３に対する円弧運動を直線運動に変換するためのリンクは不要であり、機構の単純化、部品点数および組立工数の削減、ひいてはコスト低減に寄与する。さらに、渦巻ばね１４は、渦巻状を成すが故に、トーションバーや捩じりコイルばね等のように一方向に突出することがない。従って空間占有率を抑えつつ目的のばね力を得ることができる。しかも、渦巻ばね１４は、コンパクトでありながら即ち空間占有率が小さいにもかかわらず、圧縮コイルばねやトーションバー等と比較して、変位可能な範囲が大きい。従って、コンパクトな構成として尚且つ背凭れ２の傾動のストロークを大きくとることも可能となる。加えて、渦巻ばね１４は、ばね定数が圧縮コイルばねやトーションバー等と比較して小さい。換言すれば、渦巻ばね１４は、変位の増加すなわち背凭れ２の傾動角度の増加に対する反力の増加が小さく、ほぼ一定の反力を発生させる。したがって、あたかもゴム材を用いた場合のように、着座者の背に負担がかからない軽く柔らかい快適なロッキング感覚を実現することができる。しかも、椅子１を廃棄する場合等に、金属材料等と一体化されたゴム材を分別するといった手間や問題はない。 Further, for example, in the present embodiment, a spiral spring 14 having one end attached to the reaction force device 13 and the other end attached to the back side connecting portion 7 b of the back side arm 7. Is used. Since the spiral spring 14 generates a spring force by being tightened, a reaction force in a direction in which the backrest 2 is returned to the initial position by directly using the rotational moment due to the arc motion with respect to the seat 3 of the backrest 2. Can be accumulated in the spiral spring 14. For this reason, a link for converting the arc motion of the backrest 2 relative to the seat 3 into a linear motion is unnecessary, which contributes to simplification of the mechanism, reduction in the number of parts and assembly man-hours, and cost reduction. Further, since the spiral spring 14 has a spiral shape, it does not protrude in one direction like a torsion bar or a torsion coil spring. Therefore, the desired spring force can be obtained while suppressing the space occupancy. Moreover, although the spiral spring 14 is compact, that is, the space occupancy is small, the range in which the spiral spring 14 can be displaced is larger than that of a compression coil spring or a torsion bar. Therefore, it is possible to take a large stroke of the tilting of the backrest 2 as a compact configuration. In addition, the spiral spring 14 has a smaller spring constant than a compression coil spring, a torsion bar, or the like. In other words, the spiral spring 14 generates a substantially constant reaction force with a small increase in reaction force against an increase in displacement, that is, an increase in the tilt angle of the backrest 2. Therefore, it is possible to realize a light, soft and comfortable rocking feeling that does not put a burden on the back of the seated person as if a rubber material is used. In addition, when the chair 1 is discarded, there is no trouble and problem of separating the rubber material integrated with the metal material or the like.
渦巻ばね１４は、帯状の弾性素材を渦巻形に巻いたものである。渦巻ばね１４の両端部は、座側連結部６ｂと背側連結部７ｂとにそれぞれ引っ掛けることで係止されるように、フック状に形成されている。以下、渦巻の中心側の端部に形成されたフックを内フック１４ａと呼び、渦巻の外周側の端部に形成されたフックを外フック１４ｂと呼ぶ。内フック１４ａと外フック１４ｂは、応力集中による破損を防止するべく、角張る部分が無いように丸く曲面状に形成することが好ましい。尚、渦巻ばね１４の個数、材質、寸法等は、目的とするばね力を得るためのものを適宜選択して良い。例えば本実施形態では渦巻ばね１４の素材に硬鋼線材を用い、嵌め合わされた座側連結部６ｂと背側連結部７ｂの内部に形成される空間に１つの渦巻ばね１４を配置するようにしている。従って、椅子１の左右両側にそれぞれ１つ、合計２つの渦巻ばね１４が設置されることとなる。 The spiral spring 14 is a spiral elastic material wound in a spiral shape. Both end portions of the spiral spring 14 are formed in a hook shape so as to be locked by being hooked on the seat side connecting portion 6b and the back side connecting portion 7b, respectively. Hereinafter, the hook formed at the end portion on the center side of the spiral is referred to as an inner hook 14a, and the hook formed at the outer end portion of the spiral is referred to as an outer hook 14b. The inner hook 14a and the outer hook 14b are preferably formed in a rounded and curved shape so that there is no angular portion in order to prevent damage due to stress concentration. Note that the number, material, dimensions, and the like of the spiral spring 14 may be appropriately selected to obtain a desired spring force. For example, in this embodiment, a hard steel wire is used as the material of the spiral spring 14, and one spiral spring 14 is arranged in a space formed inside the seat-side coupling portion 6b and the back-side coupling portion 7b that are fitted together. Yes. Therefore, two spiral springs 14 are installed, one on each of the left and right sides of the chair 1.
背側連結部７ｂは、図３及び図５に示すように、座側連結部６ｂと対向する面側が開放された中空の円盤状に形成されており、背側連結部７ｂの内周縁には内側に凹んだ凹状段部１５が形成されている。凹状段部１５は円の一部を切り欠いた円弧状すなわちＣ形に形成されている。また凹状段部１５の一部が背側連結部７ｂの内部の中心に向かって突出しており、この突出部分が回転規制部１６を構成している。背側連結部７ｂの内部の中心部には、渦巻ばね１４の内フック１４ａが掛けられる溝１７ａを有する取付軸１７が設けられている。 As shown in FIG. 3 and FIG. 5, the back side connecting portion 7 b is formed in a hollow disk shape whose surface facing the seat side connecting portion 6 b is open, and on the inner periphery of the back side connecting portion 7 b A concave step 15 that is recessed inward is formed. The concave step portion 15 is formed in an arc shape with a part of a circle cut out, that is, in a C shape. Further, a part of the concave step portion 15 protrudes toward the center inside the back side connecting portion 7 b, and this protruding portion constitutes the rotation restricting portion 16. A mounting shaft 17 having a groove 17a on which the inner hook 14a of the spiral spring 14 is hooked is provided at the center inside the back side connecting portion 7b.
座側連結部６ｂも、図４に示すように、背側連結部７ｂと対向する面側が開放された中空の円盤状に形成されており、座側連結部６ｂの内周縁には、背側連結部７ｂの側に突出して背側連結部７ｂの凹状段部１５と嵌合する凸状段部１８が形成されている。凸状段部１８は円の一部を切り欠いた円弧状すなわちＣ形に形成されている。また凸状段部１８の内周には、背側連結部７ｂの回転規制部１６と係合する第１規制部１９と第２規制部２０とが、図５に示すように回転規制部１６を挟む位置に形成されている。また、座側連結部６ｂの内周縁には渦巻ばね１４の外フック１４ｂが掛けられるばね掛け部２１が設けられている。このばね掛け部２１は、ばね掛け部２１に掛けられた外フック１４ｂが凸状段部１８および凹状段部１５の途切れた部分に位置するように設けられ、例えば第２規制部２０と一体に設けられている。また、座側連結部６ｂの内部の中心部には、取付軸１７が回転可能に嵌められる孔２２が設けられている。 As shown in FIG. 4, the seat side connecting portion 6 b is also formed in a hollow disk shape whose surface facing the back side connecting portion 7 b is open. A convex step portion 18 that protrudes toward the connecting portion 7b and fits with the concave step portion 15 of the back side connecting portion 7b is formed. The convex step portion 18 is formed in an arc shape with a part of a circle cut away, that is, in a C shape. Further, on the inner periphery of the convex stepped portion 18, a first restricting portion 19 and a second restricting portion 20 that engage with the rotation restricting portion 16 of the back side connecting portion 7b are provided as shown in FIG. It is formed in the position which sandwiches. Further, a spring hooking portion 21 on which the outer hook 14b of the spiral spring 14 is hooked is provided on the inner peripheral edge of the seat side connecting portion 6b. The spring hooking portion 21 is provided so that the outer hook 14b hung on the spring hooking portion 21 is located at a portion where the convex stepped portion 18 and the concave stepped portion 15 are interrupted. For example, the spring hooking portion 21 is integrated with the second restricting portion 20. Is provided. In addition, a hole 22 in which the mounting shaft 17 is rotatably fitted is provided in the center portion inside the seat side connecting portion 6b.
従って、渦巻ばね１４の内フック１４ａを取付軸１７の溝１７ａに引っ掛けると共に外フック１４ｂをばね掛け部２１に引っ掛けて、凸状段部１８を凹状段部１５に嵌合させ且つ取付軸１７を孔２２に挿入することで、背側連結部７ｂと座側連結部６ｂとが嵌め合わせられ、渦巻ばね１４は背側連結部７ｂと座側連結部６ｂとで形成される内部空間に内蔵される。渦巻ばね１４が外観には現れないため見栄えが良くなると共に、渦巻ばね１４に手や物を挟むといった事故も無くなる。 Accordingly, the inner hook 14a of the spiral spring 14 is hooked on the groove 17a of the mounting shaft 17 and the outer hook 14b is hooked on the spring hooking portion 21 so that the convex step portion 18 is fitted to the concave step portion 15 and the mounting shaft 17 is moved. By inserting into the hole 22, the back side connecting portion 7b and the seat side connecting portion 6b are fitted together, and the spiral spring 14 is built in an internal space formed by the back side connecting portion 7b and the seat side connecting portion 6b. The Since the spiral spring 14 does not appear in the appearance, the appearance is improved, and an accident such as a hand or an object being caught in the spiral spring 14 is eliminated.
椅子１の左右両側において夫々背側連結部７ｂと座側連結部６ｂとが嵌め合わせられることにより、背凭れ２が座３に対して回転可能に連結されるとともに、当該回転以外の背凭れ２の移動が禁止される。そして、図５に示すように、背側連結部７ｂと一体に回転する回転規制部１６と、座側連結部６ｂと一体に設けられた第１規制部１９と第２規制部２０とにより、背凭れ２の回転範囲が規制される。即ち、渦巻ばね１４は、背側連結部７ｂの回転規制部１６を第２規制部２０に当接させるようにばね力を作用させている。回転規制部１６が第２規制部２０に当接している状態が、背凭れ２が初期位置にある状態となる。一方、渦巻ばね１４のばね力に抗しながら背凭れ２を傾動させると、即ち背側連結部７ｂを座側連結部６ｂに対して回転させると、回転規制部１６が第１規制部１９に当接する。回転規制部１６が第１規制部１９に当接している状態が、背凭れ２が最も後方に倒れた状態となる。 The back-side connecting portion 7b and the seat-side connecting portion 6b are fitted to each other on both the left and right sides of the chair 1, so that the backrest 2 is rotatably connected to the seat 3, and the backrest 2 other than the rotation is also provided. Movement is prohibited. And, as shown in FIG. 5, by the rotation restricting portion 16 that rotates integrally with the back side connecting portion 7b, and the first restricting portion 19 and the second restricting portion 20 provided integrally with the seat side connecting portion 6b, The rotation range of the backrest 2 is restricted. That is, the spiral spring 14 exerts a spring force so that the rotation restricting portion 16 of the back side connecting portion 7 b is brought into contact with the second restricting portion 20. A state in which the rotation restricting portion 16 is in contact with the second restricting portion 20 is a state in which the backrest 2 is in the initial position. On the other hand, when the backrest 2 is tilted against the spring force of the spiral spring 14, that is, when the back side connecting portion 7 b is rotated with respect to the seat side connecting portion 6 b, the rotation restricting portion 16 is moved to the first restricting portion 19. Abut. The state in which the rotation restricting portion 16 is in contact with the first restricting portion 19 is the state in which the backrest 2 has fallen most backward.
ここで、渦巻ばね１４を巻き締める際に、渦巻を成す線材の間に密着が生じると、その密着した部分より内側の部分では渦巻ばね１４が実質的に働かないので、充分なばね力が得られず、また渦巻ばね１４に過負荷がかかって渦巻ばね１４が破損する虞もある。そこで本実施形態では、取付軸１７を周縁が真円ではない略閉曲線を成す形状、例えば略楕円形状としている。これにより、渦巻ばね１４の線材間の密着を防いで上記のような不都合を防止できる。 Here, when the spiral spring 14 is tightened, if close contact occurs between the wires forming the spiral, the spiral spring 14 does not substantially work in a portion inside the contacted portion, so that sufficient spring force is obtained. In addition, the spiral spring 14 may be damaged by being overloaded. Therefore, in the present embodiment, the mounting shaft 17 has a shape that forms a substantially closed curve whose peripheral edge is not a perfect circle, for example, a substantially elliptical shape. Thereby, the close_contact | adherence between the wire materials of the spiral spring 14 can be prevented, and the above inconveniences can be prevented.
また、座側連結部６ｂにおける背側連結部７ｂと対向する面と逆側の面には、肘掛け２３が例えばねじ止めで取り付けられている。尚、図４中の符号２４は、肘掛け２３を座側連結部６ｂにねじ止めするためのねじ孔であり、図２中の符号２５は当該ねじ止め後に肘掛け２３に嵌め付けるキャップである。尚、以上に説明した椅子１を構成する各部材の材質は、必要とされる又は望ましい機械的強度、軽量性、耐候性、加工容易性等を備える金属材料や合成樹脂等を適宜選択可能である。例えば本実施形態では、背側アーム７はアルミダイカストで一体成形され、座側連結部６ｂおよび取付部６ｃもアルミダイカストで一体成形されている。また、背凭れ２のインナーシェル２ｂはポリプロピレン製としている。また、背凭れ本体２ａおよび座本体３ａには、例えばポリウレタン等の発泡樹脂や繊維状のクッション材などを布地などの表皮部材で包んだものを用いている。 Moreover, the armrest 23 is attached to the surface on the opposite side to the surface facing the back side connection part 7b in the seat side connection part 6b, for example by screwing. Reference numeral 24 in FIG. 4 is a screw hole for screwing the armrest 23 to the seat side connecting portion 6b, and reference numeral 25 in FIG. 2 is a cap to be fitted to the armrest 23 after the screwing. In addition, the material of each member which comprises the chair 1 demonstrated above can select suitably the metal material, a synthetic resin, etc. with required or desirable mechanical strength, lightness, weather resistance, workability, etc. is there. For example, in this embodiment, the back side arm 7 is integrally formed by aluminum die casting, and the seat side connecting portion 6b and the attachment portion 6c are also integrally formed by aluminum die casting. The inner shell 2b of the backrest 2 is made of polypropylene. The backrest main body 2a and the seat main body 3a are made of, for example, a foamed resin such as polyurethane or a fibrous cushion material wrapped with a skin member such as a cloth.
以上のように構成された本実施形態の椅子１によれば、次のようにして背凭れ２が傾動する。即ち、初期位置にある背凭れ２に対して着座者が凭れかかることにより荷重を作用させると、Ｃ点を中心に背凭れ２が後方に倒れるように回転する。背凭れ２の回転中心Ｃは坐骨結節点Ｐ１の近傍に設定されている。ここで、図６は、坐骨結節点Ｐ１を中心に、後方に回転すなわち後傾する前後の背凭れ２及び着座者を示し、二点鎖線で描いた背凭れ２および着座者が後傾した後を示している。同図に示されるように、坐骨結節点Ｐ１を中心に回転する着座者の坐骨結節４は、座面Ｓ１の更に下方へと沈み込もうとはせずに、座面Ｓ１の上で回転する。従って、背凭れ２の回転中心Ｃを坐骨結節点Ｐ１の近傍に設定することで、特に本実施形態のように回転中心Ｃを坐骨結節点Ｐ１よりもやや後方に設定することで、着座者の体重を支える坐骨結節４が座面Ｓ１に強く押しつけられることを防いで、着座者の臀部への負荷を軽減することができる。また、坐骨結節４が座面Ｓ１の上で自然に回転するため、着座者の背中が倒れるに従って、着座者の骨盤も坐骨結節点Ｐ１を支点として自然に後方に回転する。従って、過度の腰椎前彎を防いで、即ち着座者の背骨が反った状態となってしまうことを防いで、着座者の腰背部への負荷をも軽減することができる。さらに、背凭れ２の傾動に応じて着座者の骨盤が自然に回転するため、背凭れ２の回転中心Ｃを転子点Ｐ２に一致させた図７に示す従来技術と比較して、背凭れ２の傾動に伴う着座者の股関節の屈曲角度を若干増加でき、椅子１のロッキング時に着座者に開放感を与えることができる。逆に、背凭れ２の傾動範囲を小さくしても、ロッキング時に充分な開放感が得られるロッキング椅子１を提供でき、省スペース化の要請にも対応できる。また、背凭れ２の回転中心Ｃを座面Ｓ１の下方に設けた場合や背凭れ面Ｓ２よりも後方に設けた場合等と比較して背凭れ２が着座者の背中に接触しながらずれてしまう量も小さくなるので、衣服に皺が寄ってしまう事を防ぐ等、背凭れ２の回転中心Ｃを転子点Ｐ２に一致させた場合と同等の効果も得られる。 According to the chair 1 of the present embodiment configured as described above, the backrest 2 tilts as follows. That is, when a load is applied by a seated person leaning against the backrest 2 in the initial position, the backrest 2 rotates around the point C so as to fall backward. The rotation center C of the backrest 2 is set in the vicinity of the sciatic node P1. Here, FIG. 6 shows the backrest 2 and the seated person before and after rotating backward, that is, tilting backward about the sciatic node P1, and after the backrest 2 and the seated person drawn by a two-dot chain line are tilted backward. Is shown. As shown in the figure, the sciatic nodule 4 of the seated person rotating around the sciatic node P1 rotates on the seating surface S1 without trying to sink further below the seating surface S1. . Therefore, by setting the rotation center C of the backrest 2 in the vicinity of the sciatic node P1, particularly by setting the rotation center C slightly behind the sciatic node P1 as in the present embodiment, It is possible to prevent the sciatic nodule 4 supporting the weight from being strongly pressed against the seat surface S1, and to reduce the load on the seated person's buttocks. Further, since the sciatic nodule 4 naturally rotates on the seating surface S1, as the seated person's back falls, the seated person's pelvis also naturally rotates backward with the sciatic node P1 as a fulcrum. Therefore, it is possible to prevent excessive lumbar lordosis, that is, to prevent the seated person's spine from being warped, and to reduce the load on the seated person's back. Furthermore, since the seated person's pelvis naturally rotates in accordance with the tilt of the backrest 2, the backrest is compared with the prior art shown in FIG. 7 in which the center of rotation C of the backrest 2 coincides with the trochanter point P2. The bending angle of the hip joint of the seated person accompanying the tilting of 2 can be slightly increased, and a feeling of opening can be given to the seated person when the chair 1 is locked. On the contrary, even if the tilting range of the backrest 2 is reduced, the rocking chair 1 can be provided with a sufficient open feeling at the time of rocking, and the demand for space saving can be met. Further, the backrest 2 is displaced while contacting the seated person's back as compared with the case where the center of rotation C of the backrest 2 is provided below the seating surface S1 or the case where it is provided behind the backrest surface S2. Since the amount of crease becomes small, an effect equivalent to the case where the rotation center C of the backrest 2 coincides with the trochanter point P2 can be obtained, such as prevention of wrinkles on clothes.
そして、座３に対する背凭れ２の後方回転に従って、背側アーム７および背側連結部７ｂおよび取付軸１７が、座側アーム６および座側連結部６ｂに対して回転し、渦巻ばね１４を巻き締める。これにより、背凭れ２を初期位置に復帰させようとする反力が渦巻ばね１４に発生する。ここで、渦巻ばね１４は背凭れ２の傾動角度の増加に対する反力の増加が小さくほぼ一定の反力を発生させるので、着座者の背に負担をかけることなく、軽く柔らかい心地の良いロッキング感覚を着座者に与えることができる。背凭れ２を後傾する外力が解除されれば、渦巻ばね１４の復帰力によって背凭れ２が初期位置に復帰する。本実施形態の椅子１によれば、座３を連動させることなく背凭れ２の傾動のみで、違和感の無い心地の良いロッキング感覚を実現することができる。 Then, according to the backward rotation of the backrest 2 with respect to the seat 3, the back side arm 7, the back side connection portion 7 b and the mounting shaft 17 rotate with respect to the seat side arm 6 and the seat side connection portion 6 b to wind the spiral spring 14. Tighten. As a result, a reaction force for returning the backrest 2 to the initial position is generated in the spiral spring 14. Here, the spiral spring 14 generates a substantially constant reaction force with a small increase in the reaction force with respect to the increase in the tilt angle of the backrest 2, so that a light, soft and comfortable rocking feeling can be achieved without placing a burden on the seated person's back. Can be given to the seated person. When the external force that tilts the backrest 2 backward is released, the backrest 2 returns to the initial position by the restoring force of the spiral spring 14. According to the chair 1 of the present embodiment, a comfortable rocking sensation with no sense of incongruity can be realized by merely tilting the backrest 2 without interlocking the seat 3.
なお、上述の実施形態は本発明の好適な実施の一例ではあるがこれに限定されるものではなく、本発明の要旨を逸脱しない範囲において種々変形実施可能である。例えば、上述の実施形態では、本発明の背凭れ傾動装置５を事務用の回転椅子１に適用した例について説明したが、他の椅子、例えば作業用椅子、看護用椅子、医療用椅子など、椅子全般に本発明を適用できるのは勿論であり、自動車等の乗物用座席にも本発明を適用して良い。また、上述の実施形態では、座側アーム６と背側アーム７との接続部分に渦巻ばね１４を用いた反力装置１３を組み込んだが、必ずしもこの例には限らず、例えば当該接続部分にモータ等を組み込み、電動で背凭れ２を傾動させるようにしても良い。 The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, an example in which the back tilting device 5 of the present invention is applied to the office rotary chair 1 has been described. However, other chairs such as a work chair, a nursing chair, a medical chair, etc. Of course, the present invention can be applied to all chairs, and the present invention may also be applied to a vehicle seat such as an automobile. In the above-described embodiment, the reaction force device 13 using the spiral spring 14 is incorporated in the connection portion between the seat side arm 6 and the back side arm 7. However, the present invention is not limited to this example. Etc., and the backrest 2 may be tilted electrically.
また、上述の実施形態では、背凭れ２の回転中心Ｃを成す回り対偶により座３と背凭れ２を連結したが、リンク機構を介して背凭れ２と座３を連結し、背凭れ２の回転中心Ｃとなる位置に仮想的な回転軸を設定するようにしても良い。さらに、本発明によれば、背凭れ２の傾動のみでも上述したように従来にない心地の良いロッキング感覚を着座者に与えることが可能であるが、背凭れ２の傾動と連動して座３を揺動させるリンク機構を介して背凭れ２と座３を連結するようにしても良い。また、上述の実施形態では、背凭れ２の回転中心Ｃを座面Ｓ１よりも上方に設けたが、回転中心Ｃを側面視で座面Ｓ１と一致する位置に設けても良い。ここで、「座面Ｓ１と一致する位置」には、座面Ｓ１とほぼ一致する位置も含むものとする。 Further, in the above-described embodiment, the seat 3 and the backrest 2 are connected by a turning pair that forms the rotation center C of the backrest 2. However, the backrest 2 and the seat 3 are connected via a link mechanism, and the backrest 2 A virtual rotation axis may be set at a position that becomes the rotation center C. Furthermore, according to the present invention, it is possible to give the seated person a comfortable rocking feeling that has not been heretofore just by tilting the backrest 2, but the seat 3 is interlocked with the tilting of the backrest 2. You may make it connect the backrest 2 and the seat 3 via the link mechanism which rocks | fluctuates. In the above-described embodiment, the rotation center C of the backrest 2 is provided above the seating surface S1, but the rotation center C may be provided at a position that coincides with the seating surface S1 in a side view. Here, the “position matching the seating surface S1” includes a position substantially matching the seating surface S1.
１ 椅子
２ 背凭れ
３ 座
５ 背凭れ傾動装置
６ 座側アーム
７ 背側アーム
１３ 反力装置
１４ 渦巻ばね
Ｃ 背凭れの回転中心
Ｐ１ 坐骨結節点
Ｐ２ 転子点
Ｓ１ 座面（座の表面）
Ｓ２ 背凭れ面（背凭れの表面）
DESCRIPTION OF SYMBOLS 1 Chair 2 Backrest 3 Seat 5 Backrest tilting device 6 Seat side arm 7 Back side arm 13 Reaction force device 14 Spiral spring C Center of rotation of backrest P1 Ischial node P2 Trochanter point S1 Seat surface (seat surface)
S2 Backrest (backrest surface)
Claims (4)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003369600A JP4445244B2 (en) | 2003-10-29 | 2003-10-29 | Back tilting device |
| CN2004800292593A CN1863471B (en) | 2003-10-29 | 2004-10-29 | Backrest reclining apparatus |
| PCT/JP2004/016137 WO2005039357A1 (en) | 2003-10-29 | 2004-10-29 | Backrest reclining apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003369600A JP4445244B2 (en) | 2003-10-29 | 2003-10-29 | Back tilting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005131047A true JP2005131047A (en) | 2005-05-26 |
| JP4445244B2 JP4445244B2 (en) | 2010-04-07 |
Family
ID=34510402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003369600A Expired - Fee Related JP4445244B2 (en) | 2003-10-29 | 2003-10-29 | Back tilting device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4445244B2 (en) |
| CN (1) | CN1863471B (en) |
| WO (1) | WO2005039357A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017086466A (en) * | 2015-11-10 | 2017-05-25 | 株式会社ピーエーエス | Reclining chair |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4831713B1 (en) * | 2011-04-25 | 2011-12-07 | 直伸 山下 | Angle adjustment bracket |
| US9458905B2 (en) * | 2012-09-20 | 2016-10-04 | Steelcase Inc. | Spring assembly and method |
| USD697726S1 (en) | 2012-09-20 | 2014-01-21 | Steelcase Inc. | Chair |
| US11304528B2 (en) | 2012-09-20 | 2022-04-19 | Steelcase Inc. | Chair assembly with upholstery covering |
| CN106942934A (en) * | 2017-04-17 | 2017-07-14 | 中山火炬开发区修龙精密机器制造厂 | Healthy chair for working |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5971708A (en) * | 1982-10-15 | 1984-04-23 | 上野 一久 | Reclining seat |
| JP3014516B2 (en) * | 1990-10-15 | 2000-02-28 | 天龍工業株式会社 | Vehicle seat |
| CA2116079C (en) * | 1993-02-22 | 2005-12-27 | Benjamin Cowan | Chair |
| CN2258017Y (en) * | 1996-02-05 | 1997-07-23 | 罗文聪 | Improved sitting and sleeping chair |
| CN2489653Y (en) * | 2001-08-01 | 2002-05-08 | 陈展俊 | Folding chair with adjustable function for tilt angle of back |
| CN2534889Y (en) * | 2002-03-28 | 2003-02-12 | 门华 | Two-purpose chair for office and relaxation |
-
2003
- 2003-10-29 JP JP2003369600A patent/JP4445244B2/en not_active Expired - Fee Related
-
2004
- 2004-10-29 CN CN2004800292593A patent/CN1863471B/en not_active Expired - Fee Related
- 2004-10-29 WO PCT/JP2004/016137 patent/WO2005039357A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017086466A (en) * | 2015-11-10 | 2017-05-25 | 株式会社ピーエーエス | Reclining chair |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005039357A1 (en) | 2005-05-06 |
| JP4445244B2 (en) | 2010-04-07 |
| CN1863471B (en) | 2010-06-02 |
| WO2005039357A9 (en) | 2006-03-16 |
| CN1863471A (en) | 2006-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3993375B2 (en) | Chair | |
| JP4647331B2 (en) | Vehicle seat with headrest | |
| US6517156B1 (en) | Backrest structure for a leisure chair | |
| WO2002032265A1 (en) | Chair | |
| JPH0817730B2 (en) | Shell structure in chair with back and seat synchronized movement | |
| EP1618816B1 (en) | Portable backrest structure | |
| JP2014054578A (en) | Rocking chair | |
| JP2019084337A (en) | Lumbar support device-equipped chair | |
| JP4445244B2 (en) | Back tilting device | |
| JP3080585B2 (en) | Chair | |
| US4969688A (en) | Vehicular seat | |
| JP2010099103A (en) | Rocking chair | |
| JPH0735166U (en) | Stool | |
| JP3801858B2 (en) | Non-rotating chair | |
| JP2006026011A (en) | Seat | |
| JP6064922B2 (en) | Vehicle seat device | |
| JP2005211467A (en) | Chair | |
| JP4960689B2 (en) | Chair | |
| JP3834500B2 (en) | Chair backrest device | |
| JP3863353B2 (en) | Chair | |
| KR200411864Y1 (en) | Waist supporting unit of chair | |
| JP3053505U (en) | Chair | |
| KR100506026B1 (en) | Seat having a head-rest of angle variable | |
| JP2541913Y2 (en) | Lumber support device | |
| JP2022102774A (en) | Chair and backrest thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060821 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20091222 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20100115 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4445244 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130122 Year of fee payment: 3 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |