JP6235303B2

JP6235303B2 - Chair

Info

Publication number: JP6235303B2
Application number: JP2013224361A
Authority: JP
Inventors: 益永　浩; 浩益永; 宏明築地; 五十嵐　僚; 僚五十嵐; 晶一井澤
Original assignee: Okamura Corp
Current assignee: Okamura Corp
Priority date: 2013-10-29
Filing date: 2013-10-29
Publication date: 2017-11-22
Anticipated expiration: 2033-10-29
Also published as: JP2015084866A

Description

本発明は、背凭れを備える椅子に関するものである。 The present invention relates to a chair having a backrest.

上記技術分野に関する背凭れを備える椅子として、例えば下記特許文献１，２に記載された椅子が知られている。これらの椅子は、着座者と接する背凭れの形状を変更させることができる構成となっている。 As a chair provided with a backrest related to the above technical field, for example, chairs described in Patent Documents 1 and 2 below are known. These chairs are configured such that the shape of the backrest in contact with the seated person can be changed.

特許文献１に記載された椅子は、背凭れの背凭れシェルの一部を可撓変形させることで、背凭れの形状を変更させる可動・ロック機構を有している。この可動・ロック機構は、背凭れシェルの幅方向における中央部に取り付けられる取付部と、取付部に対し回動可能で背凭れシェルの幅方向における両端部（補助サポート部）を撓ませる可動部と、を有している。 The chair described in Patent Literature 1 has a movable / locking mechanism that changes the shape of the backrest by flexibly deforming a part of the backrest shell of the backrest. This movable / locking mechanism has an attachment part attached to the center part in the width direction of the backrest shell, and a movable part that can rotate with respect to the attachment part and bends both ends (auxiliary support parts) in the width direction of the backrest shell. And have.

特許文献２に記載された椅子は、樹脂製繊維が張設された環状枠の幅方向における両端部を左右に近接離間させることで、背凭れの形状を変更させる湾曲調整機構を有している。この湾曲調整機構は、環状枠と、その裏面に垂直状に構成した一対の脚部との幅方向における締め付け量を調整する締付ボルトを有している。 The chair described in Patent Document 2 has a bending adjustment mechanism that changes the shape of the backrest by moving both end portions in the width direction of the annular frame on which resin fibers are stretched close to and from the left and right. . This bending adjustment mechanism has a tightening bolt that adjusts the tightening amount in the width direction between the annular frame and a pair of leg portions formed perpendicular to the back surface thereof.

特許第４１８５９９２号公報Japanese Patent No. 4185992 実公昭４６−３５０１８号公報Japanese Utility Model Publication No. 46-3518

しかしながら、上記先行技術には、次のような問題がある。
特許文献１に記載された椅子は、背凭れの強度を確保するものが、背凭れシェルの単一部品である。背凭れシェルの幅方向における中央部は、可動・ロック機構の取付部が取り付けられ、着座者から荷重を受けるため、剛性が高い。したがって、可動・ロック機構によって変形するところは、剛性を下げた背凭れシェルの幅方向における両端部（補助サポート部）の僅かな範囲である。また、背凭れシェルの幅方向における中央部と両端部との剛性を異ならせるように成形するには手間がかかる。
また、特許文献２に記載された椅子は、湾曲調整機構が締付ボルトを左右に移動させ、環状枠の幅方向における両端部の間隔を変更するものであるため、環状枠に張設された樹脂製繊維の張力が低下して着座者を支持する力が低下してしまう。 However, the above prior art has the following problems.
The chair described in Patent Document 1 is a single component of a backrest shell that ensures the strength of the backrest. The central portion in the width direction of the backrest shell is provided with a movable / locking mechanism mounting portion and receives a load from the seated person, so that the rigidity is high. Therefore, the portion deformed by the movable / lock mechanism is a slight range of both end portions (auxiliary support portions) in the width direction of the backrest shell with reduced rigidity. Moreover, it takes time and effort to form the back shell in the width direction so that the central portion and the both end portions have different rigidity.
Further, the chair described in Patent Document 2 is stretched around the annular frame because the bending adjustment mechanism moves the tightening bolt to the left and right to change the distance between both ends in the width direction of the annular frame. The tension | tensile_strength of resin fiber falls and the force which supports a seated person will fall.

本発明は、上記問題点に鑑みてなされたものであり、背凭れの湾曲形状を大きく変更可能であると共に着座者を支持する力の低下を抑制可能である椅子の提供を目的とする。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a chair that can greatly change the curved shape of the backrest and can suppress a decrease in force that supports a seated person.

この発明に係る椅子では、上記課題を解決するために以下の構成を採用した。
この発明に係る椅子は、着座者と接して荷重を受ける受面構成部を有する背凭れと、前記背凭れを背後から支える背凭れ支持部材と、前記背凭れの幅方向における中央部と両端部とを前後に相対移動させて前記受面構成部の湾曲形状を変更する湾曲形状変更手段と、を有する、ことを特徴とするものである。
この構成によれば、背凭れの背後が背凭れ支持部材によって支えられているため、背凭れ全体の剛性を下げても着座者の荷重を受けることができる。したがって、背凭れに十分な弾性を与えて、その受面構成部の湾曲形状を大きく変更させることができる。また、背凭れは、その幅方向における中央部と両端部とを前後に相対移動させるため、湾曲形状変更の際に幅方向における両端部の間隔が大きく変更されず、着座者を支持する力の低下を抑制できる。 The chair according to the present invention employs the following configuration in order to solve the above problems.
The chair according to the present invention includes a backrest having a receiving surface component that receives a load in contact with a seated person, a backrest support member that supports the backrest from behind, a center portion and both end portions in the width direction of the backrest And a curved shape changing means for changing the curved shape of the receiving surface constituting part by moving the relative position back and forth.
According to this configuration, since the back of the backrest is supported by the backrest support member, it is possible to receive a seated person's load even if the rigidity of the entire backrest is lowered. Therefore, sufficient elasticity can be given to the backrest, and the curved shape of the receiving surface constituting portion can be greatly changed. In addition, since the backrest relatively moves the center portion and both end portions in the width direction back and forth, the distance between the both end portions in the width direction is not greatly changed when the curved shape is changed, and the force of supporting the seated person is reduced. Reduction can be suppressed.

また、この発明に係る椅子において、前記湾曲形状変更手段は、前記中央部を前記背凭れ支持部材に固定する固定部と、前記両端部に設けられ、前記背凭れ支持部材に対して前後に移動可能な移動端部と、を有する、ことを特徴とするものである。
この構成によれば、背凭れの幅方向における中央部が背凭れ支持部材に固定されているため、背凭れの幅方向における両端部を背凭れ支持部材に対して前後に移動させることにより、背凭れの受面構成部の湾曲形状を変更させることができる。 Further, in the chair according to the present invention, the curved shape changing means is provided at a fixed portion that fixes the central portion to the backrest support member, and at both ends, and moves back and forth with respect to the backrest support member. And a possible moving end.
According to this configuration, since the center portion in the width direction of the backrest is fixed to the backrest support member, both ends in the width direction of the backrest are moved back and forth with respect to the backrest support member. The curved shape of the curved receiving surface constituent part can be changed.

また、この発明に係る椅子において、前記背凭れは、前方に屈曲する突出部を有しており、前記移動端部は、前記突出部に対応する位置に設けられている、ことを特徴とするものである。
この構成によれば、背凭れの前方に屈曲する突出部は着座者の腰等を支えとなる座り心地に影響する部分であるため、その突出部に対応する位置を前後に移動させることで、着座者の着座感を容易に変更できる。例えば、着座者の腰をホールドするように背凭れの湾曲形状を変更することで、着座者の側方へのズレを防止することもできる。 In the chair according to the present invention, the backrest has a protruding portion that bends forward, and the moving end portion is provided at a position corresponding to the protruding portion. Is.
According to this configuration, since the protruding portion that bends forward of the backrest is a portion that affects the sitting comfort that supports the waist of the seated person, by moving the position corresponding to the protruding portion back and forth, The seated feeling of the seated person can be easily changed. For example, the lateral displacement of the seated person can be prevented by changing the curved shape of the backrest so as to hold the seated person's waist.

また、この発明に係る椅子において、前記受面構成部は、前記相対移動によって変形する領域と、該領域よりも相対的に変形しない領域と、を形成する境界部を有する、ことを特徴とするものである。
この構成によれば、境界部があることで変形する領域と相対的に変形しない領域とを区別でき、受面構成部の湾曲形状をある程度制御できるため、湾曲形状変更の際に着座者の着座感が大きく変更されてしまうことを抑制できる。 Moreover, the chair which concerns on this invention WHEREIN: The said receiving surface structure part has a boundary part which forms the area | region which deform | transforms by the said relative movement, and the area | region which does not deform | transform relatively rather than this area | region, It is characterized by the above-mentioned. Is.
According to this configuration, the region that deforms due to the boundary portion can be distinguished from the region that does not deform relatively, and the curved shape of the receiving surface component can be controlled to some extent. It can suppress that a feeling changes greatly.

また、この発明に係る椅子において、前記湾曲形状変更手段は、前記背凭れ及び前記背凭れ支持部材のいずれか一方に移動可能に支持されて、前記中央部と前記両端部とを前後に相対移動させるための操作部材を有する、ことを特徴とするものである。
この構成によれば、操作部材を操作することで背凭れの幅方向における中央部と両端部とを前後に相対移動させることができ、操作性が良くなる。 Further, in the chair according to the present invention, the curved shape changing means is supported by one of the backrest and the backrest support member so as to be movable, and the center portion and the both end portions are relatively moved back and forth. It has an operating member for making it operate | move.
According to this configuration, by operating the operation member, the center portion and both end portions in the backrest width direction can be relatively moved back and forth, and the operability is improved.

また、この発明に係る椅子において、前記操作部材は、前記背凭れ及び前記背凭れ支持部材の互いに対向する対向面のいずれか一方側に回転可能に支持される基端部と、前記基端部を中心に回動し、前記背凭れ及び前記背凭れ支持部材の前記対向面の他方側を押圧する先端部と、を有する、ことを特徴とするものである。
この構成によれば、操作部材を操作し、その基端部を中心にその先端部を回動させ、背凭れ若しくは背凭れ支持部材の対向面を押圧し、操作部材をその対向面間で突っ張らせることで、受面構成部の湾曲形状を変更できる。 Moreover, the chair which concerns on this invention WHEREIN: The said operation member is a base end part rotatably supported by either one side of the mutually opposing surface of the said backrest and the said backrest support member, and the said base end part And a distal end portion that presses the other side of the opposing surface of the backrest and the backrest support member.
According to this configuration, the operation member is operated, the distal end portion thereof is rotated around the base end portion, the backrest or the opposite surface of the backrest support member is pressed, and the operation member is stretched between the opposite surfaces. By making it, the curved shape of a receiving surface structure part can be changed.

また、この発明に係る椅子において、前記背凭れ及び前記背凭れ支持部材の前記対向面の他方側には、前記先端部の回動軌跡に沿って前記先端部と係合可能な係合溝が形成されている、ことを特徴とするものである。
この構成によれば、操作部材の先端部が回動する間、係合溝に係合しているため、先端部が背凭れ若しくは背凭れ支持部材から外れて押圧が解除されてしまうことを防止できる。 Further, in the chair according to the present invention, an engagement groove that can be engaged with the distal end portion along the rotation trajectory of the distal end portion is provided on the other side of the opposite surface of the backrest and the backrest supporting member. It is characterized by being formed.
According to this configuration, since the distal end portion of the operating member is engaged with the engaging groove while the distal end portion rotates, the distal end portion is prevented from being released from the backrest or the backrest support member and being released from being pressed. it can.

また、この発明に係る椅子において、前記先端部は、ボール状に形成されている、ことを特徴とするものである。
この構成によれば、操作部材の先端部は基端部を中心に回動するが、その先端部はボール状であるため背凭れ若しくは背凭れ支持部材への当たり方を一定に維持することができる。 Moreover, the chair which concerns on this invention WHEREIN: The said front-end | tip part is formed in the ball shape, It is characterized by the above-mentioned.
According to this configuration, the distal end portion of the operation member rotates around the proximal end portion, but since the distal end portion is ball-shaped, it is possible to maintain a constant contact with the backrest or the backrest support member. it can.

この発明によれば、背凭れの湾曲形状を大きく変更可能であると共に着座者を支持する力の低下を抑制可能である椅子が得られる。 According to the present invention, it is possible to obtain a chair that can greatly change the curved shape of the backrest and can suppress a decrease in the force for supporting the seated person.

この発明の第１の実施形態の椅子の側面図である。It is a side view of the chair of 1st Embodiment of this invention. この発明の第１の実施形態の椅子の平面図である。It is a top view of the chair of 1st Embodiment of this invention. この発明の第１の実施形態の椅子の背面図である。It is a rear view of the chair of 1st Embodiment of this invention. この発明の第１の実施形態の椅子の背面側斜視図である。It is a back side perspective view of the chair of a 1st embodiment of this invention. この発明の第１の実施形態の湾曲形状変更手段の構成図である。It is a block diagram of the curve shape change means of 1st Embodiment of this invention. この発明の第１の実施形態の湾曲形状変更手段の係合溝が設けられた背凭れの背面図である。It is a back view of the backrest provided with the engagement groove | channel of the curved shape change means of 1st Embodiment of this invention. 図６における矢視Ａ−Ａ断面図である。It is arrow AA sectional drawing in FIG. この発明の第２の実施形態の背凭れの背凭れ板の正面図である。It is a front view of the backrest board of the backrest of 2nd Embodiment of this invention. この発明の第３の実施形態の背凭れの背凭れ板の平面図である。It is a top view of the backrest board of the backrest of 3rd Embodiment of this invention. この発明の第４の実施形態の背凭れと背凭れ支持部材との固定部の正面図である。It is a front view of the fixing | fixed part of the backrest and backrest support member of 4th Embodiment of this invention. 図１０における矢視Ｂ−Ｂ断面図である。It is arrow BB sectional drawing in FIG. この発明の第４の実施形態の背凭れと背凭れ支持部材との組み合わせ方を説明する正面図である。It is a front view explaining how to combine the backrest and backrest support member of the fourth embodiment of the present invention.

以下、この発明の実施形態を図面に基づいて説明する。なお、以下の説明においては、椅子に正規姿勢で着座した人の正面が向く図中矢印ＦＲの指す向きを「前」と呼び、それと逆側の向きを「後」と呼ぶものとする。また、「上」，「下」と「左」，「右」については、椅子に正規姿勢で着座した人の上方の図中矢印ＵＰの指す向きを「上」、それと逆側の向きを「下」と呼び、椅子に正規姿勢で着座した人の左側の図中矢印ＬＨの指す向きを「左」、それと逆側の向きを「右」と呼ぶものとする。 Embodiments of the present invention will be described below with reference to the drawings. In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

先ず、図１〜図７に示す第１の実施形態について説明する。
図１は、この発明の第１の実施形態の椅子１の側面図である。
図１に示すように、本実施形態の椅子１は、フロア上に載置される脚部２と、脚部２の上端に設置されるボックス状の支基３と、着座者が着座する座体４と、支基３の上面に取り付けられ座体４を前後スライド可能に支持する座受部材５と、座体４に着座した着座者の背中を支持する背凭れ６と、背凭れ６を背後から支える背凭れ支持部材７と、背凭れ６の受面構成部２０の湾曲形状を変更する湾曲形状変更手段８と、を有する。 First, the first embodiment shown in FIGS. 1 to 7 will be described.
FIG. 1 is a side view of a chair 1 according to a first embodiment of the present invention.
As shown in FIG. 1, a chair 1 according to this embodiment includes a leg 2 placed on a floor, a box-shaped support base 3 installed at the upper end of the leg 2, and a seat on which a seated person sits. A body 4, a seat receiving member 5 that is attached to the upper surface of the support base 3 and supports the seat body 4 so as to be slidable back and forth, a backrest 6 that supports the back of a seated person seated on the seat body 4, and a backrest 6. The backrest supporting member 7 supported from behind and the curved shape changing means 8 for changing the curved shape of the receiving surface constituting portion 20 of the backrest 6 are provided.

脚部２は、キャスタ９ａ付きの多岐脚９と、多岐脚９の中央部より起立し昇降機構であるガススプリングを内蔵する脚柱１０と、を有し、脚柱１０の上端部に支基３が水平方向に回転可能に取り付けられている。支基３には、脚柱１０の昇降調整機構と背凭れ支持部材７の傾動調整機構が内蔵されている。背凭れ支持部材７は、側面視略Ｌ字形状を有し、その前部下端が支基３内の傾動調整機構に連結されている。
なお、図１中、符号１１は、支基３上における背凭れ支持部材７の枢支軸であり、符号１２は、支基３の側面に突設された傾動調整機構の操作ノブである。 The leg 2 has a diverging leg 9 with casters 9 a and a pedestal 10 that stands up from the center of the diverging leg 9 and incorporates a gas spring as an elevating mechanism. 3 is attached to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 10 and a tilt adjustment mechanism for the backrest support member 7. The back support member 7 has a substantially L shape in a side view, and a front lower end thereof is connected to a tilt adjustment mechanism in the support base 3.
In FIG. 1, reference numeral 11 denotes a pivot shaft of the backrest support member 7 on the support base 3, and reference numeral 12 denotes an operation knob of a tilt adjustment mechanism protruding from the side surface of the support base 3.

座体４は、骨格部を成す座板１３と、座板１３の上部に取り付けられる座本体１４と、を有する。座本体１４は、詳細な図示は省略するが、座板１３の外周縁部に取り付けられる座枠（不図示）と、座板１３の上面に設置されるウレタン等から成るクッション材（不図示）と、座枠に張設されてクッション材の上方側を覆うシート表皮材１５と、を有する。 The seat body 4 includes a seat plate 13 that forms a skeleton portion, and a seat body 14 that is attached to the upper portion of the seat plate 13. The seat body 14 is not shown in detail, but a seat frame (not shown) attached to the outer peripheral edge of the seat plate 13 and a cushion material (not shown) made of urethane or the like installed on the upper surface of the seat plate 13. And a seat skin material 15 which is stretched on the seat frame and covers the upper side of the cushion material.

図２は、この発明の第１の実施形態の椅子１の平面図である。図３は、この発明の第１の実施形態の椅子１の背面図である。図４は、この発明の第１の実施形態の椅子１の背面側斜視図である。
背凭れ６は、図２に示すように、着座者と接して荷重を受ける受面構成部２０を有する。受面構成部２０は、図２に示す平面視で、後方に凸となる湾曲形状を有する。本実施形態の受面構成部２０は、樹脂成型された背凭れ板２１（図４参照）と、背凭れ板２１の前面に設置されるクッション材（不図示）と、背凭れ板２１に張設されてクッション材を覆うシート表皮材２２と、によって形成されている。 FIG. 2 is a plan view of the chair 1 according to the first embodiment of the present invention. FIG. 3 is a rear view of the chair 1 according to the first embodiment of the present invention. FIG. 4 is a rear perspective view of the chair 1 according to the first embodiment of the present invention.
As shown in FIG. 2, the backrest 6 has a receiving surface constituting portion 20 that receives a load in contact with a seated person. The receiving surface constituent part 20 has a curved shape that protrudes backward in the plan view shown in FIG. The receiving surface component 20 of the present embodiment includes a resin-backed backrest 21 (see FIG. 4), a cushion material (not shown) installed on the front surface of the backrest 21, and a tension on the backrest 21. And a seat skin material 22 that covers the cushion material.

背凭れ６は、図３に示す背面視で、四隅が丸みを帯びた略長方形状とされている。また、背凭れ６は、図１に示すように、前方に屈曲する突出部２３を有する。本実施形態の背凭れ６は、図１に示す側面視で、前方に凸の屈曲形状を有している。突出部２３の頂点は、着座者の腰に対応する位置に形成されている。すなわち、突出部２３は、図１に示す側面視で、背凭れ６の下端部よりもやや上方の部分が前方に突出するように、適所で屈曲した形状を有している。 The backrest 6 has a substantially rectangular shape with rounded four corners in the rear view shown in FIG. Moreover, the backrest 6 has the protrusion part 23 bent forward, as shown in FIG. The backrest 6 of the present embodiment has a convexly bent shape in front as viewed from the side shown in FIG. The apex of the protrusion 23 is formed at a position corresponding to the seated person's waist. That is, the protruding portion 23 has a shape bent at an appropriate position so that a portion slightly above the lower end portion of the backrest 6 protrudes forward in a side view shown in FIG.

背凭れ支持部材７は、図１に示すように、背凭れ６を背後から支えるものである。背凭れ支持部材７は、背凭れ６よりも剛性が高く、背凭れ６で受けた着座者の荷重を支える強度部材である。背凭れ支持部材７は、樹脂成型されており、厚み大きさや補強リブの配置等により、背凭れ６よりも剛性が高く構成されている。背凭れ支持部材７は、図３に示す背面視で、背凭れ６の外形と略同じ外形を有する枠部３０を有する。枠部３０は、背面側に大きく開口する開口部３１を有している。 As shown in FIG. 1, the backrest support member 7 supports the backrest 6 from behind. The backrest support member 7 is a strength member that has higher rigidity than the backrest 6 and supports the load of the seated person received by the backrest 6. The backrest support member 7 is resin-molded, and is configured to be more rigid than the backrest 6 due to the thickness, the arrangement of reinforcing ribs, and the like. The backrest support member 7 has a frame portion 30 having an outer shape substantially the same as the outer shape of the backrest 6 in the rear view shown in FIG. The frame part 30 has an opening part 31 that opens greatly on the back side.

背凭れ支持部材７は、図１に示すように、背凭れ６の突出部２３に対応する位置に、前方に屈曲する突出部３２を有する。すなわち、突出部３２は、図１に示す側面視で、枠部３０の下端部よりもやや上方の部分が前方に突出するように、適所で屈曲した形状を有している。この突出部３２には、後述する湾曲形状変更手段８の操作部材５０が配置されるようになっている。背凭れ支持部材７は、枠部３０の下端部から前方に延出する連結部３３を有する。連結部３３は、支基３内の傾動調整機構に連結されている。 As shown in FIG. 1, the backrest support member 7 has a protrusion 32 that bends forward at a position corresponding to the protrusion 23 of the backrest 6. That is, the protrusion 32 has a shape bent at an appropriate position so that a portion slightly above the lower end of the frame 30 protrudes forward in a side view shown in FIG. An operation member 50 of the curved shape changing means 8 described later is arranged on the protruding portion 32. The backrest support member 7 includes a connecting portion 33 that extends forward from the lower end portion of the frame portion 30. The connecting portion 33 is connected to a tilt adjustment mechanism in the support base 3.

図５は、この発明の第１の実施形態の湾曲形状変更手段８の構成図である。図６は、この発明の第１の実施形態の湾曲形状変更手段８の係合溝６０が設けられた背凭れ６の背面図である。図７は、図６における矢視Ａ−Ａ断面図である。なお、これらの図では、受面構成部２０を形成するクッション材、シート表皮材２２を不図示としている。
湾曲形状変更手段８は、図５に示すように、背凭れ６の幅方向（左右方向）における中央部２４と両端部２５とを前後に相対移動させて受面構成部２０の湾曲形状を変更するものである。 FIG. 5 is a configuration diagram of the curved shape changing means 8 according to the first embodiment of the present invention. FIG. 6 is a rear view of the backrest 6 provided with the engagement groove 60 of the curved shape changing means 8 according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view taken along the line AA in FIG. In these drawings, the cushion material and the seat skin material 22 forming the receiving surface constituting portion 20 are not shown.
As shown in FIG. 5, the curved shape changing means 8 changes the curved shape of the receiving surface constituting portion 20 by relatively moving the central portion 24 and both end portions 25 in the width direction (left-right direction) of the backrest 6 in the front-rear direction. To do.

湾曲形状変更手段８は、図３に示すように、背凭れ６の中央部２４を背凭れ支持部材７に固定する固定部４０と、図２及び図５に示すように、背凭れ６の両端部２５に設けられ、背凭れ支持部材７に対して前後に移動可能な移動端部４１と、を有する。固定部４０は、図３に示すように、複数の固定ネジ４２によって、背凭れ６の中央部２４を背凭れ支持部材７に固定する構成となっている。 As shown in FIG. 3, the curved shape changing means 8 includes a fixing portion 40 that fixes the central portion 24 of the backrest 6 to the backrest support member 7, and both ends of the backrest 6 as shown in FIGS. 2 and 5. And a moving end 41 that is provided in the portion 25 and is movable back and forth with respect to the back support member 7. As shown in FIG. 3, the fixing portion 40 is configured to fix the central portion 24 of the backrest 6 to the backrest support member 7 with a plurality of fixing screws 42.

固定ネジ４２は、背凭れ６の中央部２４の上端部を、背凭れ支持部材７の枠部３０の上端部に固定すると共に、背凭れ６の中央部２４の下端部を、背凭れ支持部材７の枠部３０の下端部に固定する。固定ネジ４２による背凭れ６の中央部２４の上端部の固定は、背凭れ６の幅方向の中心とその両脇の三か所で行う構成となっている。また、固定ネジ４２による背凭れ６の中央部２４の下端部の固定は、背凭れ６の幅方向の中心の一か所で行う構成となっている。 The fixing screw 42 fixes the upper end portion of the center portion 24 of the backrest 6 to the upper end portion of the frame portion 30 of the backrest support member 7 and fixes the lower end portion of the center portion 24 of the backrest 6 to the backrest support member. 7 is fixed to the lower end of the frame 30. The upper end portion of the central portion 24 of the backrest 6 is fixed by the fixing screw 42 at a center in the width direction of the backrest 6 and at three places on both sides thereof. Further, the fixing of the lower end portion of the central portion 24 of the backrest 6 with the fixing screw 42 is performed at one place in the center of the backrest 6 in the width direction.

移動端部４１は、背凭れ支持部材７に固定されない背凭れ６の自由端であり、背凭れ支持部材７に対して前後に移動可能な構成となっている。すなわち、移動端部４１は、固定部４０を支点とする背凭れ６（背凭れ板２１）の弾性変形によって前後に移動する。移動端部４１は、背凭れ６の突出部２３に対応する位置に設けられている。背凭れ６の突出部２３に対応する位置には操作部材５０が配置されており、移動端部４１は、操作部材５０の押圧によって前後に移動する構成となっている。 The moving end 41 is a free end of the backrest 6 that is not fixed to the backrest support member 7, and is configured to be movable back and forth with respect to the backrest support member 7. That is, the moving end 41 moves back and forth by elastic deformation of the backrest 6 (backrest plate 21) with the fixed portion 40 as a fulcrum. The moving end portion 41 is provided at a position corresponding to the protruding portion 23 of the backrest 6. The operation member 50 is disposed at a position corresponding to the protruding portion 23 of the backrest 6, and the moving end portion 41 is configured to move back and forth when the operation member 50 is pressed.

操作部材５０は、図１に示すように、背凭れ６及び背凭れ支持部材７のいずれか一方（本実施形態では背凭れ支持部材７）に移動可能に支持されている。操作部材５０は、背凭れ６の中央部２４と両端部２５とを前後に相対移動させるためのものであり、着座者が把持可能な把持部５１を有する。把持部５１は、着座者の操作性を向上させるものであり、図３に示すように、略Ｌ形状を有すると共に、背凭れ６の側部に突出し、着座者が座体４に座った状態で把持可能な構成となっている。 As shown in FIG. 1, the operation member 50 is movably supported by one of the backrest 6 and the backrest support member 7 (in this embodiment, the backrest support member 7). The operation member 50 is for moving the central portion 24 and both end portions 25 of the backrest 6 back and forth, and has a grip portion 51 that can be gripped by a seated person. The grip 51 improves the operability of the seated person. As shown in FIG. 3, the gripping part 51 has a substantially L shape and protrudes to the side of the backrest 6 so that the seated person sits on the seat 4. It can be gripped with.

操作部材５０は、図４及び図５に示すように、背凭れ６及び背凭れ支持部材７の互いに対向する対向面２６，３４のいずれか一方側（本実施形態では対向面３４側）に回転可能に支持される基端部５２と、基端部５２を中心に回動し、背凭れ６及び背凭れ支持部材７の対向面２６，３４の他方側（本実施形態では対向面２６側）を押圧する先端部５３と、を有する。また、背凭れ６及び背凭れ支持部材７の対向面２６，３４の他方側（本実施形態では対向面２６側）には、図４〜図６に示すように、先端部５３の回動軌跡に沿って、先端部５３と係合可能な係合溝６０が形成されている。 As shown in FIGS. 4 and 5, the operation member 50 rotates to either one of the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7 facing each other (in the present embodiment, the opposing surface 34 side). A base end portion 52 that is supported, and the other end of the backrest 6 and the opposing surfaces 26 and 34 of the backrest support member 7 that rotate about the base end portion 52 (in this embodiment, the opposing surface 26 side). And a tip portion 53 that presses. Further, on the other side of the opposing surfaces 26, 34 of the backrest 6 and the backrest support member 7 (on the opposing surface 26 side in this embodiment), as shown in FIGS. An engagement groove 60 that can be engaged with the distal end portion 53 is formed along the.

係合溝６０は、背凭れ６の背後に設けられている。係合溝６０は、図６に示すように、背凭れ６の両端部２５の外形に沿って設けられている。すなわち、係合溝６０は、高さ方向（上下方向）に延在している。また、係合溝６０は、背凭れ６の突出部２３に対応する位置を上下で跨ぐように延在しており、背凭れ６の突出部２３より下側の傾斜形状に沿って幅方向（左右方向）内側に曲がるように形成されている。 The engagement groove 60 is provided behind the backrest 6. As shown in FIG. 6, the engaging groove 60 is provided along the outer shape of both end portions 25 of the backrest 6. That is, the engagement groove 60 extends in the height direction (vertical direction). The engaging groove 60 extends so as to straddle the position corresponding to the protruding portion 23 of the backrest 6 in the vertical direction, and the width direction along the inclined shape below the protruding portion 23 of the backrest 6 ( (Left and right direction) It is formed to bend inward.

係合溝６０は、図７に示すように、所定の摺動性を有するライナー６１とライナー支持部材６３における保持部６４とによって形成されている。ライナー６１は、操作部材５０の先端部５３と摺接するものであり、先端部５３の形状に対応した形状を有している。本実施形態の操作部材５０の先端部５３は、ボール状（球状）に形成されており、ライナー６１は、断面視で円弧状に形成されている。ライナー６１は、第１ライナー部材６１ａと第２ライナー部材６１ｂに分割可能に構成されている。第１ライナー部材６１ａと第２ライナー部材６１ｂは、凹凸の嵌合部６２によって組み合わせ可能に構成されている。 As shown in FIG. 7, the engagement groove 60 is formed by a liner 61 having a predetermined slidability and a holding portion 64 in the liner support member 63. The liner 61 is in sliding contact with the distal end portion 53 of the operation member 50 and has a shape corresponding to the shape of the distal end portion 53. The distal end portion 53 of the operation member 50 according to the present embodiment is formed in a ball shape (spherical shape), and the liner 61 is formed in an arc shape in a sectional view. The liner 61 is configured to be divided into a first liner member 61a and a second liner member 61b. The 1st liner member 61a and the 2nd liner member 61b are comprised so that a combination with the uneven | corrugated fitting part 62 is possible.

ライナー６１は、ライナー支持部材６３によって背凭れ６（背凭れ板２１）の背後に固定されている。ライナー支持部材６３は、ライナー６１を保持する保持部６４と、背凭れ板２１に係合可能な係合突起６５と、を有する。保持部６４は、ライナー６１の外径よりも狭い間隔で、一対で設けられている。係合突起６５は、ライナー支持部材６３の内側において、幅方向（左右方向）に突出して設けられている。なお、係合突起６５は、不図示であるがライナー支持部材６３の左右の適所に複数設けられている。なお、ライナー６１とライナー支持部材６３とは、二色成型等の手段により一体的に形成してもよい。 The liner 61 is fixed behind the backrest 6 (backrest plate 21) by a liner support member 63. The liner support member 63 includes a holding portion 64 that holds the liner 61 and an engagement protrusion 65 that can be engaged with the backrest plate 21. The holding portions 64 are provided as a pair at intervals smaller than the outer diameter of the liner 61. The engagement protrusion 65 is provided so as to protrude in the width direction (left-right direction) inside the liner support member 63. Note that a plurality of engagement protrusions 65 are provided at appropriate positions on the left and right sides of the liner support member 63 (not shown). The liner 61 and the liner support member 63 may be integrally formed by means such as two-color molding.

背凭れ板２１は、ライナー支持部材６３を取り付け可能な取付溝６６を有する。取付溝６６には、複数のリブ６７が立設している。ライナー６１は、ライナー支持部材６３と複数のリブ６７との間に挟まれて固定されている。リブ６７には、ライナー支持部材６３の係合突起６５と係合する係合穴６８が設けられている。係合穴６８は、リブ６７に幅方向（左右方向）に貫通して設けられている。係合突起６５と係合穴６８とが係合することで、ライナー支持部材６３が背凭れ板２１に対して固定される。 The backrest plate 21 has an attachment groove 66 to which the liner support member 63 can be attached. A plurality of ribs 67 are erected in the mounting groove 66. The liner 61 is sandwiched and fixed between the liner support member 63 and the plurality of ribs 67. The rib 67 is provided with an engagement hole 68 that engages with the engagement protrusion 65 of the liner support member 63. The engagement hole 68 is provided through the rib 67 in the width direction (left-right direction). The liner support member 63 is fixed to the backrest plate 21 by the engagement protrusion 65 and the engagement hole 68 engaging with each other.

操作部材５０は、先端部５３が係合溝６０に係合する一方、基端部５２が回転軸６９に回転自在に支持されている。回転軸６９は、幅方向に延在し、背凭れ支持部材７に設けられている。基端部５２は、回転軸６９が挿通する軸受穴７０を有する。軸受穴７０の径は、回転軸６９の径よりも大きくなるように設計されている。すなわち、基端部５２は、回転軸６９の軸線と直交する方向にガタを有している。本実施形態の操作部材５０は、このガタにより、図６に示す係合溝６０に沿って先端部５３を幅方向（左右方向）に移動可能としている。 The operation member 50 has a distal end 53 that engages with the engagement groove 60, and a proximal end 52 that is rotatably supported by the rotation shaft 69. The rotation shaft 69 extends in the width direction and is provided on the back support member 7. The base end portion 52 has a bearing hole 70 through which the rotation shaft 69 is inserted. The diameter of the bearing hole 70 is designed to be larger than the diameter of the rotating shaft 69. That is, the base end portion 52 has a backlash in a direction orthogonal to the axis of the rotation shaft 69. The operation member 50 of this embodiment can move the front-end | tip part 53 to the width direction (left-right direction) along the engagement groove | channel 60 shown in FIG.

続いて、上記構成の湾曲形状変更手段８を用いた背凭れ６の形状変更の操作及びその作用について説明する。 Next, an operation for changing the shape of the backrest 6 using the curved shape changing means 8 having the above-described configuration and its operation will be described.

着座者は、座体４に座った状態で、図３に示す背凭れ６の左右に突出する操作部材５０の把持部５１を把持し、上方に引き上げる。操作部材５０は、基端部５２が背凭れ支持部材７に回転可能に支持されており、基端部５２を中心に先端部５３が上方に回動する（図１参照）。先端部５３が上方に回動すると、操作部材５０は、背凭れ６及び背凭れ支持部材７の互いに対向する対向面２６，３４間に突っ張り、対向面２６，３４間の距離を押し広げる。背凭れ支持部材７は、背凭れ６よりも剛性が高く、背凭れ６側が弾性変形する。 While sitting on the seat body 4, the seated person grips the grip portion 51 of the operation member 50 that protrudes to the left and right of the backrest 6 shown in FIG. 3 and pulls it upward. In the operation member 50, the base end portion 52 is rotatably supported by the backrest support member 7, and the distal end portion 53 is rotated upward about the base end portion 52 (see FIG. 1). When the distal end portion 53 rotates upward, the operation member 50 pushes between the opposing surfaces 26 and 34 of the backrest 6 and the backrest support member 7 and pushes the distance between the opposing surfaces 26 and 34. The backrest support member 7 has higher rigidity than the backrest 6, and the backrest 6 side is elastically deformed.

背凭れ６は、図３に示すように、中央部２４が固定部４０によって背凭れ支持部材７に固定されており、両端部２５が背凭れ支持部材７に対して移動可能とされている。このため、背凭れ６の両端部２５が、操作部材５０の押圧によって前方に移動する（図５参照）。背凭れ６の両端部２５が前方に移動すると、背凭れ６の受面構成部２０の曲率が大きくなり、図５に示すように、受面構成部２０の湾曲形状が形状Ｃ１から形状Ｃ２に変更されることとなる。 As shown in FIG. 3, the backrest 6 has a central portion 24 fixed to the backrest support member 7 by a fixing portion 40, and both end portions 25 are movable with respect to the backrest support member 7. For this reason, the both ends 25 of the backrest 6 move forward by the pressing of the operating member 50 (see FIG. 5). When both end portions 25 of the backrest 6 move forward, the curvature of the receiving surface constituting portion 20 of the backrest 6 increases, and the curved shape of the receiving surface constituting portion 20 changes from the shape C1 to the shape C2 as shown in FIG. Will be changed.

本実施形態では、背凭れ６の背後が背凭れ支持部材７によって支えられているため、強度を背凭れ支持部材７によって確保できる分、背凭れ６全体の剛性を下げても着座者の荷重を受けることができる。したがって、背凭れ６に十分な弾性を与えて、図２及び図５に示すように、受面構成部２０の湾曲形状を大きく変更させることができる。また、背凭れ６は、その幅方向における中央部２４と両端部２５とを前後に相対移動させるため、湾曲形状変更の際に幅方向における両端部２５の間隔が大きく変更されることはない。 In the present embodiment, since the back of the backrest 6 is supported by the backrest support member 7, the load on the seated person can be increased even if the rigidity of the backrest 6 is lowered as much as the strength can be secured by the backrest support member 7. Can receive. Therefore, sufficient elasticity can be given to the backrest 6, and the curved shape of the receiving surface constituting portion 20 can be greatly changed as shown in FIGS. 2 and 5. Further, since the backrest 6 relatively moves the central portion 24 and both end portions 25 in the width direction back and forth, the distance between the both end portions 25 in the width direction is not greatly changed when the curved shape is changed.

すなわち、背凭れ６のその幅方向における中央部２４と両端部２５とを左右に相対移動させる従来の形態では、受面構成部２０が張材等で構成されている場合、撓みにより着座者を支持する力が低下する虞があるが、本実施形態では、背凭れ６のその幅方向における中央部２４と両端部２５とを前後に相対移動させるため、着座者を支持する力の低下を抑制することができる。 That is, in the conventional form in which the central portion 24 and both end portions 25 of the backrest 6 in the width direction are relatively moved to the left and right, when the receiving surface constituting portion 20 is made of a tension material or the like, Although the supporting force may be reduced, in the present embodiment, the central portion 24 and both end portions 25 in the width direction of the backrest 6 are moved relative to each other in the front-rear direction, so that a decrease in the force that supports the seated person is suppressed. can do.

また、本実施形態では、背凭れ６の幅方向における中央部２４を背凭れ支持部材７に固定し、背凭れ６の幅方向における両端部２５に設けられた移動端部４１を操作部材５０で押圧して前後に移動させるようになっている。この移動端部４１は、背凭れ６の前方に屈曲する突出部２３に対応する位置に設けられている。この突出部２３は着座者の腰等を支えとなる座り心地に影響する部分であるため、突出部２３に対応する位置を前後に移動させることで、着座者の着座感を容易に変更できる。例えば、着座者の腰をホールドするように背凭れ６の湾曲形状を変更することで、着座者の側方へのズレを防止することができる。 Further, in the present embodiment, the central portion 24 in the width direction of the backrest 6 is fixed to the backrest support member 7, and the moving end portions 41 provided at both end portions 25 in the width direction of the backrest 6 are operated by the operation member 50. Press and move back and forth. The moving end portion 41 is provided at a position corresponding to the protruding portion 23 that bends forward of the backrest 6. Since the protrusion 23 is a part that affects the sitting comfort that supports the waist of the seated person, the seating feeling of the seated person can be easily changed by moving the position corresponding to the protrusion 23 back and forth. For example, the lateral displacement of the seated person can be prevented by changing the curved shape of the backrest 6 so as to hold the waist of the seated person.

また、本実施形態では、操作部材５０を操作し、その基端部５２を中心にその先端部５３を回動させ、背凭れ６の対向面２６側を押圧し、操作部材５０をその対向面２６，３４間で突っ張らせることで、受面構成部２０の湾曲形状を変更させるようになっている。背凭れ６には、図７に示すように、先端部５３の回動軌跡に沿って係合溝６０が設けられている。このため、先端部５３は、回動する間、係合溝６０に係合しており、背凭れ６から外れて押圧が解除されてしまうことはない。また、先端部５３は、ボール状に形成されており、背凭れ６への当たり方を一定に維持でき、また、操作部材５０を回動させても操作感が変わることはない。 Further, in this embodiment, the operation member 50 is operated, the distal end portion 53 is rotated around the base end portion 52, the opposite surface 26 side of the backrest 6 is pressed, and the operation member 50 is moved to the opposite surface. The curved shape of the receiving surface constituting part 20 is changed by stretching between 26 and 34. As shown in FIG. 7, the backrest 6 is provided with an engaging groove 60 along the turning locus of the tip portion 53. For this reason, the front-end | tip part 53 is engaged with the engagement groove | channel 60, while rotating, and it does not remove | deviate from the backrest 6, and pressure is not cancelled | released. Further, the distal end portion 53 is formed in a ball shape so that the manner of hitting the backrest 6 can be kept constant, and even if the operation member 50 is rotated, the feeling of operation does not change.

このように、上述の本実施形態によれば、着座者と接して荷重を受ける受面構成部２０を有する背凭れ６と、背凭れ６を背後から支える背凭れ支持部材７と、背凭れ６の幅方向における中央部２４と両端部２５とを前後に相対移動させて受面構成部２０の湾曲形状を変更する湾曲形状変更手段８と、を有する、という構成を採用することによって、背凭れ６の湾曲形状を大きく変更可能であると共に着座者を支持する力の低下を抑制可能である椅子１が得られる。 Thus, according to the above-described embodiment, the backrest 6 having the receiving surface component 20 that receives the load in contact with the seated person, the backrest support member 7 that supports the backrest 6 from the back, and the backrest 6 By adopting a configuration in which the center portion 24 and the both end portions 25 in the width direction of the base plate are moved back and forth to change the curved shape of the receiving surface constituting portion 20, the backrest is adopted. Thus, the chair 1 that can greatly change the curved shape 6 and can suppress a decrease in the force to support the seated person is obtained.

続いて、この発明の第２の実施形態について図１〜図７を援用し、図８を参照して説明する。なお、以下で説明する各実施形態においては、上記実施形態と共通部分に同一符号を付して重複する説明を省略するものとする。
図８は、この発明の第２の実施形態の背凭れ６の背凭れ板８０の正面図である。この実施形態の椅子は、第１の実施形態とは背凭れ６の構造のみが異なり、その他の部分は第１の実施形態と同様とされている。 Subsequently, a second embodiment of the present invention will be described with reference to FIG. 8 with reference to FIGS. In each embodiment described below, the same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.
FIG. 8 is a front view of the backrest plate 80 of the backrest 6 according to the second embodiment of the present invention. The chair of this embodiment is different from the first embodiment only in the structure of the backrest 6, and the other parts are the same as those of the first embodiment.

この実施形態の背凭れ６の受面構成部２０は、多数の線材部８２によって高さ方向及び幅方向に複数の開口部が形成された背凭れ板８０と、背凭れ板８０の前面に設置されるクッション材（不図示）と、背凭れ板８０に張設されてクッション材を覆うシート表皮材（不図示）と、背凭れ板８０の背面を覆う背凭れカバー（不図示）と、によって形成されている。背凭れ板８０は、その外縁部を形成するフレーム８１と、フレーム８１の内側において縦横に配置された複数の線材部８２と、によって形成されている。 The back surface receiving portion 20 of the backrest 6 of this embodiment is installed on the backrest plate 80 in which a plurality of openings are formed in the height direction and the width direction by a large number of wire portions 82, and on the front surface of the backrest plate 80. A cushion material (not shown), a seat covering material (not shown) that is stretched over the backrest plate 80 and covers the cushion material, and a backrest cover (not shown) that covers the back of the backrest plate 80 Is formed. The backrest plate 80 is formed by a frame 81 that forms an outer edge portion thereof, and a plurality of wire portions 82 that are arranged vertically and horizontally inside the frame 81.

受面構成部２０は、上述の湾曲形状変更手段８による中央部２４と両端部２５との前後の相対移動によって変形する領域Ｔ１と、領域Ｔ１よりも相対的に変形しない領域Ｔ２と、を形成する境界部８３を有する。本実施形態の境界部８３は、背凭れ板８０に形成されている。境界部８３は、背凭れ板８０の線材部８２に形成されたスリット８４を有する。スリット８４は、線材部８２の適所に設けられ、高さ方向（上下方向）に並んで配置されている。 The receiving surface forming unit 20 forms a region T1 that is deformed by the relative movement of the central portion 24 and the both end portions 25 by the curved shape changing means 8 described above and a region T2 that is relatively undeformed than the region T1. The boundary portion 83 is provided. The boundary portion 83 of this embodiment is formed on the backrest plate 80. The boundary portion 83 has a slit 84 formed in the wire portion 82 of the backrest plate 80. The slits 84 are provided at appropriate positions of the wire portion 82 and are arranged side by side in the height direction (vertical direction).

この境界部８３は、線材部８２に形成したスリット８４によって適所の剛性を低下させ、変形の境界を形成するものである。この第２の実施形態によれば、境界部８３があることで、変形する領域Ｔ１と、相対的に変形しない領域Ｔ２とを区別でき、受面構成部２０の湾曲形状をある程度制御できる。すなわち、受面構成部２０の変形を左右方向にある程度方向づけることができるため、第１の実施形態の作用効果をより確実に発揮し、背凭れ６の湾曲形状を大きく変更可能とすると共に、湾曲形状変更の際に着座者の着座感が大きく変更されてしまうことを抑制できる。 The boundary portion 83 is formed with a slit 84 formed in the wire portion 82 to reduce the rigidity at an appropriate place to form a deformation boundary. According to the second embodiment, the presence of the boundary portion 83 makes it possible to distinguish between the deformed region T1 and the relatively undeformed region T2, and the curved shape of the receiving surface constituting unit 20 can be controlled to some extent. That is, since the deformation of the receiving surface constituting part 20 can be directed to the left and right to some extent, the operational effects of the first embodiment can be more reliably exhibited, the curved shape of the backrest 6 can be greatly changed, and the curved shape It can suppress that a seated person's seating feeling changes greatly in the case of a shape change.

続いて、この発明の第３の実施形態について図１〜図７を援用し、図９を参照して説明する。なお、以下で説明する各実施形態においては、上記実施形態と共通部分に同一符号を付して重複する説明を省略するものとする。
図９は、この発明の第３の実施形態の背凭れ６の背凭れ板２１の平面図である。この実施形態の椅子は、第１の実施形態とは背凭れ板２１の構造のみが異なり、その他の部分は第１の実施形態と同様とされている。 Subsequently, a third embodiment of the present invention will be described with reference to FIG. In each embodiment described below, the same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.
FIG. 9 is a plan view of the backrest plate 21 of the backrest 6 according to the third embodiment of the present invention. The chair of this embodiment is different from the first embodiment only in the structure of the backrest plate 21, and the other parts are the same as those of the first embodiment.

この実施形態の境界部８３は、背凭れ板２１に形成されている。境界部８３は、背凭れ板２１に形成された溝８５を有する。溝８５は、背凭れ板２１の適所に設けられ、高さ方向（上下方向）に延在している。この境界部８３は、背凭れ板２１に形成した溝８５によって適所の厚み（剛性）を低下させ、変形の境界を形成するものである。この第３の実施形態によれば、境界部８３があることで、変形する領域Ｔ１と、相対的に変形しない領域Ｔ２とを区別でき、受面構成部２０の湾曲形状を制御できる、という第２の実施形態と同様の作用効果を発揮することができる。 The boundary 83 in this embodiment is formed on the backrest plate 21. The boundary portion 83 has a groove 85 formed in the backrest plate 21. The groove 85 is provided at an appropriate position on the backrest plate 21 and extends in the height direction (vertical direction). The boundary portion 83 forms a boundary of deformation by reducing the thickness (rigidity) at an appropriate position by the groove 85 formed in the backrest plate 21. According to the third embodiment, since there is the boundary portion 83, the region T1 that is deformed and the region T2 that is not relatively deformed can be distinguished, and the curved shape of the receiving surface constituting unit 20 can be controlled. The same effects as those of the second embodiment can be exhibited.

続いて、この発明の第４の実施形態について図１〜図７を援用し、図１０〜図１２を参照して説明する。なお、以下で説明する各実施形態においては、上記実施形態と共通部分に同一符号を付して重複する説明を省略するものとする。
図１０は、この発明の第４の実施形態の背凭れ６と背凭れ支持部材７との固定部４０の正面図である。図１１は、図１０における矢視Ｂ−Ｂ断面図である。図１１は、この発明の第４の実施形態の背凭れ６と背凭れ支持部材７との組み合わせ方を説明する正面図である。この実施形態の椅子は、第１の実施形態とは背凭れ６、背凭れ支持部材７、固定部４０の構造のみが異なり、その他の部分は第１の実施形態と同様とされている。 Subsequently, a fourth embodiment of the present invention will be described with reference to FIGS. 10 to 12 with reference to FIGS. In each embodiment described below, the same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.
FIG. 10 is a front view of the fixing portion 40 between the backrest 6 and the backrest support member 7 according to the fourth embodiment of the present invention. 11 is a cross-sectional view taken along the line BB in FIG. FIG. 11 is a front view for explaining how to combine the backrest 6 and the backrest support member 7 according to the fourth embodiment of the present invention. The chair of this embodiment is different from the first embodiment only in the structure of the backrest 6, the backrest support member 7, and the fixing portion 40, and other parts are the same as those of the first embodiment.

図１０に示すように、この実施形態の背凭れ６の受面構成部２０は、多数の線材部８２によって高さ方向及び幅方向に複数の開口部が形成された背凭れ板８０と、背凭れ板８０の前面に設置されるクッション材（不図示）と、背凭れ板８０に張設されてクッション材を覆うシート表皮材（不図示）と、背凭れ板８０の背面を覆う背凭れカバー（不図示）と、によって形成されている。背凭れ板８０は、その外縁部を形成するフレーム８１と、フレーム８１の内側において縦横に配置された複数の線材部８２と、によって形成されている。 As shown in FIG. 10, the receiving surface constituting portion 20 of the backrest 6 of this embodiment includes a backrest plate 80 in which a plurality of openings are formed in the height direction and the width direction by a number of wire portions 82, and the backrest plate 80. Cushion material (not shown) installed on the front surface of the back plate 80, sheet skin material (not shown) stretched on the back plate 80 and covering the cushion material, and a back cover covering the back surface of the back plate 80 (Not shown). The backrest plate 80 is formed by a frame 81 that forms an outer edge portion thereof, and a plurality of wire portions 82 that are arranged vertically and horizontally inside the frame 81.

フレーム８１は、その下端部中央を分断するスリット８６を有する。スリット８６によって形成される空間は、線材部８２によって形成された下端部中央の開口部８７と連通している。このため、背凭れ板８０は、下端部中央で二股に分かれるようになっている。
背凭れ支持部材７は、図１２に示すように、枠部３０の内側に、剛性を確保するための複数のリブ９０が縦横に設けられている。このリブ９０は、枠部３０の下端部及び連結部３３に形成されている。 The frame 81 has a slit 86 that divides the center of its lower end. The space formed by the slit 86 communicates with the opening 87 at the center of the lower end formed by the wire portion 82. For this reason, the backrest plate 80 is divided into two forks at the center of the lower end.
As shown in FIG. 12, the backrest support member 7 is provided with a plurality of ribs 90 vertically and horizontally for ensuring rigidity inside the frame portion 30. The rib 90 is formed on the lower end portion of the frame portion 30 and the connecting portion 33.

湾曲形状変更手段８は、図１０に示すように、背凭れ６の中央部２４を背凭れ支持部材７に固定する固定部４０を有する。固定部４０は、背凭れ６の中央部２４の上端部を背凭れ支持部材７の枠部３０の上端部に固定する固定ネジ４２と、背凭れ６の中央部２４の下端部と背凭れ支持部材７の下端部とを係合させる係合部４３と、を有する。係合部４３は、図１２に示すように、背凭れ６に設けられた係合突起４４と、背凭れ支持部材７に設けられた係合溝４５と、から形成されている。係合部４３は、背凭れ板８０の下端部を開く方向への背凭れ６の変形を許容しつつ、背凭れ６の下端部の前方への移動（抜け）を規制するものである。 As shown in FIG. 10, the curved shape changing means 8 includes a fixing portion 40 that fixes the central portion 24 of the backrest 6 to the backrest support member 7. The fixing portion 40 includes a fixing screw 42 that fixes the upper end portion of the center portion 24 of the backrest 6 to the upper end portion of the frame portion 30 of the backrest support member 7, and a backrest support for the lower end portion of the center portion 24 of the backrest 6. And an engaging portion 43 that engages with the lower end portion of the member 7. As shown in FIG. 12, the engaging portion 43 is formed by an engaging protrusion 44 provided on the backrest 6 and an engaging groove 45 provided on the backrest support member 7. The engaging portion 43 restricts the forward movement (detachment) of the lower end portion of the backrest 6 while allowing the deformation of the backrest 6 in the direction of opening the lower end portion of the backrest plate 80.

係合突起４４は、背凭れ板８０に一体的に形成されている。係合突起４４は、背凭れ板８０の下端部から下方に延びる棒体であり、スリット８６を挟んだ両側に一対で設けられている。この係合突起４４は、前方に膨らんだ先端部４４ａを有している。
一方、係合溝４５は、背凭れ支持部材７に一体的に形成されている。係合溝４５は、枠部３０の下端部のリブ９０の間に形成された溝であり、係合突起４４に対応して一対で設けられている。この係合溝４５は、左右方向に延在して形成されている。 The engagement protrusion 44 is formed integrally with the backrest plate 80. The engagement protrusions 44 are rods extending downward from the lower end of the backrest plate 80, and are provided as a pair on both sides of the slit 86. The engagement protrusion 44 has a front end portion 44a that swells forward.
On the other hand, the engagement groove 45 is formed integrally with the back support member 7. The engagement grooves 45 are grooves formed between the ribs 90 at the lower end of the frame portion 30, and are provided as a pair corresponding to the engagement protrusions 44. The engagement groove 45 is formed extending in the left-right direction.

図１１の断面図に示すように、係合溝４５は、前方斜め上方に向いて開口しており、その開口に係合突起４４が挿入されるようになっている。係合溝４５は、前壁を形成するリブ９０の側面に形成された開口部４６を有する。係合突起４４の先端部４４ａは、開口部４６と係合することで、前方斜め上方への抜けが規制されるようになっている。開口部４６は、図１０に示すように、左右方向に延在して形成されている。このため、係合突起４４は、先端部４４ａが開口部４６に係合した状態で、左右に移動可能な構成となっている。 As shown in the sectional view of FIG. 11, the engagement groove 45 is opened obliquely upward and forward, and the engagement protrusion 44 is inserted into the opening. The engagement groove 45 has an opening 46 formed on the side surface of the rib 90 forming the front wall. The front end portion 44a of the engagement protrusion 44 is engaged with the opening portion 46, so that the front protrusion 44a is prevented from coming off obliquely upward. As shown in FIG. 10, the opening 46 is formed extending in the left-right direction. For this reason, the engagement protrusion 44 is configured to be movable to the left and right in a state where the tip end portion 44 a is engaged with the opening 46.

上記構成の第４実施形態によれば、背凭れ６の中央部２４の下端部を完全に固定せず、左右方向の変形を許容しつつ、前方への移動を規制する半固定状態とすることができる。上述したように、背凭れ６は、背凭れ６の幅方向における中央部２４を背凭れ支持部材７に固定し、背凭れ６の幅方向における両端部２５に設けられた移動端部４１を操作部材５０で押圧して前後に移動させるようになっている。この第４実施形態によれば、背凭れ６の中央部２４の下端部が完全に固定されていないため、移動端部４１の前後の移動に追従して左右方向に柔軟に変形できる。これにより、操作部材５０の操作に要する力が上記第１実施形態よりも小さくなり、操作部材５０の操作性を向上させることができる。 According to the fourth embodiment having the above-described configuration, the lower end portion of the central portion 24 of the backrest 6 is not completely fixed, and a semi-fixed state that restricts forward movement is allowed while allowing lateral deformation. Can do. As described above, the backrest 6 fixes the central portion 24 in the width direction of the backrest 6 to the backrest support member 7 and operates the moving end portions 41 provided at both end portions 25 in the width direction of the backrest 6. The member 50 is pressed and moved back and forth. According to this 4th Embodiment, since the lower end part of the center part 24 of the backrest 6 is not completely fixed, following the front-back movement of the movement end part 41, it can deform | transform flexibly in the left-right direction. Thereby, the force required for operation of the operation member 50 becomes smaller than in the first embodiment, and the operability of the operation member 50 can be improved.

以上、図面を参照しながら本発明の好適な実施形態について説明したが、本発明は上記実施形態に限定されるものではない。上述した実施形態において示した各構成部材の諸形状や組み合わせ等は一例であって、本発明の主旨から逸脱しない範囲において設計要求等に基づき種々変更可能である。 As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

例えば、上記実施形態では、操作部材の先端部が背凭れの対向面側を押圧する構成について説明したが、本発明は、操作部材の先端部が背凭れ支持部材の対向面側を押圧する構成であっても良い。また、この場合、背凭れの対向面側に係合溝が形成されている構成を採用することが好ましい。 For example, in the above-described embodiment, the configuration in which the distal end portion of the operation member presses the opposite surface side of the backrest has been described. However, the present invention provides a configuration in which the distal end portion of the operation member presses the opposite surface side of the backrest support member. It may be. In this case, it is preferable to employ a configuration in which an engagement groove is formed on the opposite surface side of the backrest.

また、例えば、上記実施形態では、操作部材の基端部が軸受穴に回転軸を挿通することで支持される構成について説明したが、本発明は、操作部材の基端部がボールジョイントで支持される構成であっても良い。但し、ボールジョイントの場合、あらゆる方向の荷重に反応して動いてしまうため、着座者からの荷重が過大である場合には、上記実施形態のように軸受穴を大きく設計し、回転軸の軸線と直交する方向に敢えてガタを持たせた頑強な構成を採用することが好ましい。 Further, for example, in the above-described embodiment, the configuration in which the base end portion of the operation member is supported by inserting the rotation shaft through the bearing hole has been described. However, in the present invention, the base end portion of the operation member is supported by the ball joint. It may be configured. However, in the case of a ball joint, it moves in response to loads in all directions, so if the load from the seated person is excessive, the bearing hole is designed to be large as in the above embodiment, and the axis of the rotating shaft It is preferable to adopt a robust configuration in which a play is intentionally given in a direction orthogonal to the direction.

また、例えば、上記実施形態では、受面構成部が背凭れ板及びその前面に配置したクッション材等によって形成される構成について説明したが、本発明は、受面構成部が枠部材に張設されたメッシュ等の張材によって形成される構成であっても良い。なお、この場合、枠部材が弾性変形可能に構成され、操作部材によって前後方向に押圧される構成を採用することが好ましい。 Further, for example, in the above-described embodiment, the configuration in which the receiving surface constituent portion is formed by the backrest plate and the cushion material disposed on the front surface thereof has been described. However, in the present invention, the receiving surface constituent portion is stretched on the frame member. The structure formed with tension materials, such as the made mesh, may be sufficient. In this case, it is preferable to adopt a configuration in which the frame member is configured to be elastically deformable and pressed in the front-rear direction by the operation member.

また、例えば、上記実施形態では、背凭れの幅方向における中央部を固定し、背凭れの幅方向における両端部を前後に移動させる構成について説明したが、本発明は、背凭れの幅方向における両端部を固定し、背凭れの幅方向における中央部を前後に移動させる構成であっても良い。この場合、背凭れの幅方向における中央部の背後に背凭れ支持部材を配置し、操作部材で中央部を押圧する構成を採用することが好ましい。 Further, for example, in the above-described embodiment, the configuration in which the center portion in the width direction of the backrest is fixed and both end portions in the width direction of the backrest are moved back and forth has been described. The structure which fixes both ends and moves the center part in the width direction of a backrest back and forth may be sufficient. In this case, it is preferable to employ a configuration in which the backrest support member is disposed behind the center portion in the width direction of the backrest and the center portion is pressed by the operation member.

また、例えば、上記実施形態では、操作部材によって背凭れの幅方向における中央部と両端部とを前後に相対移動させる構成について説明したが、本発明は、操作部材を用いずに、直接手で背凭れの幅方向における中央部と両端部とを前後に相対移動させる構成であっても良い。但し、操作部材を用いれば、直接手で移動させるよりも軽力で、背凭れの湾曲形状を変更することができる。 Further, for example, in the above-described embodiment, the configuration in which the center portion and the both end portions in the backrest width direction are relatively moved back and forth by the operation member has been described, but the present invention does not use the operation member but directly by hand. The center part and both ends in the width direction of the backrest may be relatively moved back and forth. However, if the operation member is used, it is possible to change the curved shape of the backrest with less force than moving it directly by hand.

また、例えば、上記実施形態では、固定部として、背凭れの中央部の下端部を完全に固定せず、左右方向の変形を許容しつつ、前方への移動を規制する半固定状態とする係合部を採用する構成について説明したが、本発明は、この構成に限定されない。例えば、背凭れの中央部の下端部の前方の移動（抜け）を規制する突起状の係止部を設けて、背凭れの中央部の下端部の固定を当該係止部による係止のみとして半固定状態とする構成を採用してもよい。 Also, for example, in the above-described embodiment, as the fixing portion, the lower end portion of the center portion of the backrest is not completely fixed, and the semi-fixed state that restricts the forward movement is allowed while allowing the deformation in the left-right direction. Although the configuration employing the joint portion has been described, the present invention is not limited to this configuration. For example, a protrusion-like locking part that restricts the forward movement (disengagement) of the lower end of the center part of the backrest is provided, and the lower end part of the center part of the backrest is fixed only by the locking part. You may employ | adopt the structure made into a semi-fixed state.

また、例えば、上記実施形態では、固定部として、背凭れの中央部の上端部を背凭れ支持部材の枠部の上端部に固定する固定ネジを採用する構成について説明したが、本発明は、この構成に限定されない。例えば、背凭れの中央部の上端部の後方に、複数の係合突起を形成し、これら係合突起が背凭れ支持体に形成した係合凹部に係合することによって、背凭れの中央部の上端部が背凭れ支持部材の枠部の上端部に固定される構成を採用してもよい。また、この係合凹部の寸法に若干の遊びを設けることによって、背凭れの中央部の上端部においても半固定状態とし、背凭れを背凭れ支持部材に対して動きやすくすると共に、これによって操作部材の操作性をより軽くすることが可能となる。 Further, for example, in the above-described embodiment, the configuration in which the fixing screw for fixing the upper end portion of the center portion of the backrest to the upper end portion of the frame portion of the backrest support member is employed as the fixing portion has been described. It is not limited to this configuration. For example, a plurality of engagement protrusions are formed behind the upper end of the center part of the backrest, and these engagement protrusions engage with an engagement recess formed in the backrest support body, so that the center part of the backrest A configuration may be adopted in which the upper end portion of the backrest is fixed to the upper end portion of the frame portion of the back support member. In addition, by providing a slight play in the size of the engaging recess, the upper end of the center part of the backrest is also semi-fixed so that the backrest can be easily moved with respect to the backrest support member, and the operation is thereby performed. The operability of the member can be further reduced.

１椅子
６背凭れ
７背凭れ支持部材
８湾曲形状変更手段
２０受面構成部
２３突出部
２４中央部
２５両端部
２６対向面
３４対向面
４０固定部
４１移動端部
５０操作部材
５２基端部
５３先端部
６０係合溝
８３境界部
Ｔ１領域
Ｔ２領域 DESCRIPTION OF SYMBOLS 1 Chair 6 Backrest 7 Backrest support member 8 Curved shape change means 20 Reception surface structure part 23 Protrusion part 24 Center part 25 Both ends part 26 Opposing surface 34 Opposing surface 40 Fixed part 41 Moving end part 50 Operating member 52 Base end part 53 Tip portion 60 Engaging groove 83 Boundary portion T1 region T2 region

Claims

A backrest having a receiving surface component that receives a load in contact with a seated person;
A back support member that supports the back from behind;
Have a, a curved shape changing means for changing the curved shape of the receiving surface constituting portion is relatively moved back and forth and the central portion and both end portions in the width direction of the backrest,
The curved shape changing means is supported by any one of the backrest and the backrest support member, and has an operation member for relatively moving the central portion and the both end portions back and forth.
The operating member is
A base end portion rotatably supported on one side of the backrest and the opposed surfaces of the backrest support member;
A chair having a distal end portion that rotates around the base end portion and presses the other side of the opposing surface of the backrest and the backrest support member .

The curved shape changing means includes
A fixing portion for fixing the center portion to the back support member;
The chair according to claim 1, further comprising: a moving end portion provided at each of the both end portions and movable back and forth with respect to the backrest support member.

The backrest has a protrusion that bends forward;
The chair according to claim 2, wherein the moving end portion is provided at a position corresponding to the protruding portion.

The said receiving surface structure part has a boundary part which forms the area | region which deform | transforms by the said relative movement, and the area | region which does not deform | transform relatively rather than this area | region, The any one of Claims 1-3 characterized by the above-mentioned. The chair according to item.

An engagement groove is formed on the other side of the backrest and the opposing surface of the backrest support member, the engagement groove being engageable with the tip portion along the rotation trajectory of the tip portion. The chair according to any one of claims 1 to 4 .

The chair according to claim 1 , wherein the tip portion is formed in a ball shape.