JP6379377B2

JP6379377B2 - Chair

Info

Publication number: JP6379377B2
Application number: JP2013220379A
Authority: JP
Inventors: 紗也香齋藤
Original assignee: Okamura Corp
Current assignee: Okamura Corp
Priority date: 2013-10-23
Filing date: 2013-10-23
Publication date: 2018-08-29
Anticipated expiration: 2033-10-23
Also published as: JP2015080642A

Description

この発明は、座体や背凭れ部等の荷重支持体を改良した椅子に関するものである。 The present invention relates to a chair having an improved load support such as a seat or a backrest.

事務用等として用いられる椅子として、着座者の荷重を支持する座体に板部材を含むものがある。この種の椅子では、座体の板部材全体が高剛性であると、柔らかな着座感が得られ難い。このため、板部材の一部を弾性変形できるようにした椅子が案出されている（特許文献１，２参照）。
特許文献１，２に記載の椅子は、座体の板部材の周縁部が椅子フレームに支持される被支持部とされるとともに、その被支持部の内側が着座者の荷重が入力される荷重受部とされ、被支持部と荷重受部の間が弾性変形可能な連結部によって連結されている。連結部は、断面Ｕ字状に下方に凸に湾曲した帯状片によって形成され、荷重受部に着座者の荷重が入力されたときに、連結部の帯状片が開くように弾性変形することにより、荷重受部の凹状の撓み変形を助長するようになっている。 As a chair used for office work or the like, there is a chair that includes a plate member in a seat body that supports a load of a seated person. In this type of chair, if the entire plate member of the seat body is highly rigid, it is difficult to obtain a soft seating feeling. For this reason, a chair has been devised in which a part of the plate member can be elastically deformed (see Patent Documents 1 and 2).
In the chairs described in Patent Documents 1 and 2, the peripheral part of the plate member of the seat is a supported part supported by the chair frame, and the load of the seated person is input inside the supported part. The receiving portion is connected between the supported portion and the load receiving portion by an elastically deformable connecting portion. The connecting portion is formed by a band-like piece curved downward in a U-shaped cross section, and elastically deforms so that the belt-like piece of the connecting portion opens when a load of a seated person is input to the load receiving portion. Further, the concave deformation of the load receiving portion is promoted.

特許第４５１８６０３号公報Japanese Patent No. 4518603 特許第４２３８０８３号公報Japanese Patent No. 4238083 特開２０１３−１０３０６８号公報JP2013-103068A

しかしながら、特許文献１，２に記載の椅子は、いずれも着座者からの荷重入力に対し荷重受部が幅方向の略中央から裏面方向（下方）に撓み変形するものであるため、荷重受部の凹状の変形とともに着座者の臀部が側方から圧迫されることになり、着座者に窮屈な着座感を与えることが懸念される。 However, in the chairs described in Patent Documents 1 and 2, since the load receiving portion is bent and deformed from the approximate center in the width direction to the back surface direction (downward) in response to the load input from the seated person, the load receiving portion With this concave deformation, the seated person's buttocks are pressed from the side, and there is a concern that the seated person may be given a tight seating feeling.

一方、この対策として、乗員の着座時に板部材の全域が面方向に拡大して撓む特許文献３に記載の技術を適用することも考えられるが、この場合、着座時や、着座後の着座者の細かな動作に応じて板部材が変形するため、経年劣化による初期位置への弾性復帰力の低下や、それに伴って発生する強度低下を招くことが懸念される。 On the other hand, as a countermeasure, it is conceivable to apply the technique described in Patent Document 3 in which the entire area of the plate member is bent in a plane direction when the occupant is seated. In this case, the seating is performed at the time of sitting or after sitting. Since the plate member is deformed in response to the detailed operation of the person, there is a concern that the elastic return force to the initial position may be reduced due to deterioration over time, and the strength generated accordingly may be reduced.

そこでこの発明は、座体等の荷重支持体に着座者の荷重が入力されたときに、荷重支持体の荷重受部が平坦面を維持したまま荷重入力方向に沿って変位できるようにして、着座感の改善と耐久性の維持を図ることのできる椅子を提供しようとするものである。 Therefore, the present invention enables the load receiving portion of the load support body to be displaced along the load input direction while maintaining a flat surface when the load of the seated person is input to the load support body such as the seat body, An object of the present invention is to provide a chair capable of improving the sitting feeling and maintaining durability.

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。
椅子本体に支持される被支持部と、該被支持部の内側に配置され、着座者の荷重を受ける荷重受部と、前記被支持部と前記荷重受部とを連結する連結部と、を有する荷重支持体を備え、前記連結部の弾性変形が前記荷重受部の変位を助長する椅子において、前記荷重受部は、着座者からの荷重入力方向の剛性が前記連結部の剛性よりも高剛性とされ、前記連結部は、前記荷重受部に接続されるとともに、前記荷重受部を通した前記着座者からの荷重入力によって被支持部に向かう方向に伸び変形する第１変形部と、一端部が前記第１変形部に接続され他端部が前記被支持部に接続されるとともに、前記荷重受部と前記第１変形部を通した前記着座者からの荷重入力によって前記被支持部に向かう方向に縮み変形する第２変形部と、を備えていることを特徴とする。
これにより、荷重受部に着座者の荷重が入力されると、連結部の第１変形部が被支持部に向かう方向に伸び変形しつつ第２変形部が被支持部に向かう方向に縮み変形し、荷重受部がほぼ平坦面を維持したまま荷重入力方向に沿って沈み込むようになる。着座者は、連結部の上記の動きにより、身体が両側方から圧迫されるような着座感を受けなくなる。また、荷重受部に着座者の荷重が入力されたときには、第１変形部の伸び変形を第２変形部の縮み変形が吸収するようにして、連結部全体が着座者からの荷重入力方向と交差する方向に弾性変形しつつ、荷重受部が裏面方向に変位するので、着座者は柔らかな着座感を得ることができる。 The chair according to the present invention employs the following configuration in order to solve the above problems.
A supported portion supported by the chair body, a load receiving portion that is disposed inside the supported portion and receives a load of a seated person, and a connecting portion that connects the supported portion and the load receiving portion. In the chair provided with a load support having an elastic deformation of the connecting portion to promote the displacement of the load receiving portion, the load receiving portion has a higher rigidity in a load input direction from a seated person than the rigidity of the connecting portion. The first connecting portion is rigid, and the connecting portion is connected to the load receiving portion, and is extended and deformed in a direction toward the supported portion by a load input from the seated person through the load receiving portion, One end portion is connected to the first deformable portion, the other end portion is connected to the supported portion, and the supported portion is input by a load input from the seated person through the load receiving portion and the first deformable portion. a second deformable portion that deforms contracts in the direction towards the, features It is characterized in.
Thus, when the load of the seated person to the load receiving portion is input, shrinkage second deformation portion first deformation portion of the connecting portion while deforming extends in a direction toward the supported portion in a direction toward the supported portion As a result, the load receiving portion sinks along the load input direction while maintaining a substantially flat surface. The seated person does not receive a seating feeling that the body is pressed from both sides by the above movement of the connecting portion. When the load of the seated person is input to the load receiving part, the expansion deformation of the first deforming part is absorbed by the contraction deformation of the second deforming part so that the whole connecting part is in the direction of load input from the seated person. Since the load receiving portion is displaced in the back direction while elastically deforming in the intersecting direction, the seated person can obtain a soft seating feeling.

前記第１変形部は、前記荷重受部の荷重受面に対し、荷重入力側と逆側で鈍角を成すように前記被支持部側に湾曲若しくは屈曲して形成され、前記第２変形部は、前記荷重受部の荷重受面に対して交差する方向に湾曲若しくは屈曲する折り返し形状を少なくとも一つ有する構成としても良い。
これにより、第１変形部と第２変形部とが滑らかに連続した形状となり、荷重受部から第１変形部に入力された荷重によって、第２変形部を効率良く縮み変形させることが可能になる。 The first deforming portion is formed by bending or bending on the supported portion side so as to form an obtuse angle on the opposite side to the load input side with respect to the load receiving surface of the load receiving portion. In addition, it may be configured to have at least one folded shape that is curved or bent in a direction intersecting the load receiving surface of the load receiving portion.
Accordingly, the first deformable portion and the second deformable portion have a smoothly continuous shape, and the second deformable portion can be efficiently contracted and deformed by the load input from the load receiving portion to the first deformable portion. Become.

前記第２変形部は、着座者からの荷重入力側に凸に湾曲若しくは屈曲する凸状折り返し部を有し、前記第１変形部は、前記凸状折り返し部の前記荷重受部寄りで、かつ荷重入力側から最も離反する位置に接続され、前記第２変形部の前記凸状折り返し部の前記荷重入力方向での最大高低差は、前記第１変形部の前記荷重入力方向での最大高低差よりも大きく設定されることが望ましい。
この場合、第１変形部が、凸状折り返し部の荷重受部寄りで、荷重入力側から最も離反する位置に接続されていることから、荷重受部の沈み込み変位に拘わらず、第１変形部から第２変形部を縮み変形させる方向に効率良く荷重を作用させることが可能になる。また、凸状折り返し部の荷重入力方向での最大高低差が、第１変形部の荷重入力方向での最大高低差よりも大きく設定されていることから、第２変形部を可及的に肉薄にせずに柔軟に縮み変形させることが可能になるとともに、第１変形部が荷重受部に近接した位置でスペースを大きく占有することがなくなる。したがって、これにより第２変形部の耐久性を向上させることが可能になるとともに、荷重支持体の裏面側のスペース効率が高まる。 The second deforming portion has a convex folded portion that curves or bends convexly toward the load input side from the seated person, and the first deforming portion is close to the load receiving portion of the convex folded portion, and The maximum height difference in the load input direction of the convex folded portion of the second deformable portion connected to the position farthest from the load input side is the maximum height difference in the load input direction of the first deformable portion. It is desirable to set a larger value.
In this case, since the first deforming portion is connected to the position closest to the load input side near the load receiving portion of the convex folded portion, the first deformation is performed regardless of the sinking displacement of the load receiving portion. It is possible to efficiently apply a load in a direction in which the second deformable portion is contracted and deformed from the portion. In addition, since the maximum height difference in the load input direction of the convex folded portion is set larger than the maximum height difference in the load input direction of the first deformable portion, the second deformable portion is made as thin as possible. In addition to being able to flexibly deform without deformation, the first deforming portion does not occupy a large space at a position close to the load receiving portion. Therefore, this makes it possible to improve the durability of the second deformable portion and increase the space efficiency on the back side of the load support.

前記第２変形部の折り返し形状部分は、稜線部を挟む二面が鋭角を成すように形成されることが望ましい。
これにより、荷重受部から第１変形部に入力された荷重によって第２変形部をより柔軟に変形させることが可能になる。 The folded portion of the second deforming portion is preferably formed such that two surfaces sandwiching the ridge line portion form an acute angle.
Thereby, it becomes possible to deform | transform a 2nd deformation | transformation part more flexibly with the load input into the 1st deformation | transformation part from the load receiving part.

この発明によれば、荷重受部に着座者の荷重が入力されたときに、連結部の第１変形部が被支持部に向かう方向に伸び変形しつつ第２の変形部が被支持部に向かう方向に縮み変形するため、荷重受部をほぼ平坦に維持したまま荷重入力方向に沿って変位させることができる。したがって、荷重受部に着座した着座者が荷重受部から窮屈な着座感を受けることがなく、着座感が良好なものとなる。
また、この発明によれば、着座者からの荷重入力時に、第１変形部の伸び変形を第２変形部の縮み変形が吸収するように連結部全体が弾性変形するため、荷重支持体の局部的な劣化を未然に防止することができる。 According to the present invention, when a seated person's load is input to the load receiving portion, the first deformable portion of the connecting portion extends and deforms in the direction toward the supported portion , and the second deformable portion becomes the supported portion . Since it shrinks and deforms in the direction of heading, it can be displaced along the load input direction while maintaining the load receiving portion substantially flat. Therefore, the seated person seated on the load receiving portion does not receive a tight seating feeling from the load receiving portion, and the seating feeling becomes good.
According to the present invention, when the load is input from the seated person, the entire connecting portion is elastically deformed so that the expansion deformation of the first deformation portion is absorbed by the contraction deformation of the second deformation portion. Deterioration can be prevented in advance.

この発明の一実施形態の椅子の側面図である。It is a side view of the chair of one Embodiment of this invention. この発明の一実施形態の椅子の背面図である。It is a rear view of the chair of one Embodiment of this invention. この発明の一実施形態の椅子の座板の上面図である。It is a top view of the seat board of the chair of one Embodiment of this invention. この発明の一実施形態の座板の図３のＩＶ−ＩＶ断面に対応する断面図である。It is sectional drawing corresponding to the IV-IV cross section of FIG. 3 of the seat board of one Embodiment of this invention. この発明の一実施形態の座体と座フレームの図４の左半分の領域に対応する断面図である。It is sectional drawing corresponding to the area | region of the left half of FIG. 4 of the seat body and seat frame of one Embodiment of this invention. この発明の一実施形態の座板の図３のＶＩ−ＶＩ断面に対応する断面図である。It is sectional drawing corresponding to the VI-VI cross section of FIG. 3 of the seat board of one Embodiment of this invention. この発明の一実施形態の座体と座フレームの図６の左半分の領域に対応する断面図である。It is sectional drawing corresponding to the area | region of the left half of FIG. 6 of the seat body and seat frame of one Embodiment of this invention. この発明の一実施形態の座板の図３のＶＩＩＩ−ＶＩＩＩ断面に対応する断面図である。It is sectional drawing corresponding to the VIII-VIII cross section of FIG. 3 of the seat board of one Embodiment of this invention.

以下、この発明の一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。 Hereinafter, an embodiment of the present invention will be described 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”.

図１，図２は、この実施形態の椅子１の全体構成を示す側面図と背面図である。
これらの図に示すように、この実施形態の椅子１は、フロアＦ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から後部上方側に延出して座体４に着座した着座者の背中を支持する背凭れ部６と、支基３と背凭れ部６の後述する支持フレーム９の前縁部とに支持されて座体４を下方で支持する座フレーム５と、を備えている。この実施形態においては、座体４が荷重支持体を構成している。 1 and 2 are a side view and a rear view showing the overall configuration of the chair 1 of this embodiment.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor F, a box-shaped support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4, a backrest 6 extending from the support base 3 to the rear upper side and supporting the back of the seated person seated on the seat body 4, and a support frame 9 of the support base 3 and the backrest 6 described later. And a seat frame 5 that is supported by the front edge portion and supports the seat body 4 below. In this embodiment, the seat body 4 constitutes a load support body.

脚部２は、キャスタ７ａ付きの多岐脚７と、多岐脚７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８と、を備え、脚柱８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８の昇降調整機構と背凭れ部６の傾動調整機構が内蔵されている。背凭れ部６は、側面視略Ｌ字状の一対の背凭れ支持フレーム９と、背凭れ支持フレーム９の後上部に取り付けられ座体４に着座した着座者の背部を直接支持する背凭れ本体１０と、を備え、背凭れ支持フレーム９の前端部が支基３に揺動可能に軸支されている。なお、図中符号１２は、支基３上における背凭れ支持フレーム９の枢支軸である。また、支基３の後端部と背凭れ支持フレーム９の中間部との間には、背凭れ本体１０を起立方向に付勢するためのガススプリング２０が揺動可能に連結されている。 The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as a lifting mechanism, and has a support base 3 at the upper end of the pedestal 8. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6. The backrest 6 includes a pair of backrest support frames 9 that are substantially L-shaped in side view, and a backrest body that directly supports the back of a seated person that is attached to the rear upper portion of the backrest support frame 9 and seated on the seat 4. 10, and the front end portion of the back support frame 9 is pivotally supported by the support base 3 so as to be swingable. In the figure, reference numeral 12 denotes a pivot shaft of the back support frame 9 on the support base 3. Further, a gas spring 20 for urging the backrest body 10 in the upright direction is connected between the rear end portion of the support base 3 and the intermediate portion of the backrest support frame 9 so as to be swingable.

背凭れ部６の背凭れ本体１０は、骨格部を成す背板１１と、背板１１の前面側と裏面の一部にかかる部分を被覆する張材１３と、背板１１の裏面側（後面側）を覆うカバー部材１４と、を備えている。なお、張材１３の裏面には、ウレタン等から成る図示しないクッション材が融着されている。
背板１１の裏面側を覆うカバー部材１４は、背板１１の裏面側に凹凸嵌合等の適宜手段によって固定される。この実施形態の場合、座体４の後方側から上方に立ち上がる背凭れ支持フレーム９の上方延出部９ａは、カバー部材１４の前面側に締結固定されている。支持フレーム９の上方延出部９ａの前方側は背板１１によって覆われている。 The backrest body 10 of the backrest portion 6 includes a back plate 11 that forms a skeleton, a tension member 13 that covers a portion of the front plate side and a part of the back surface of the back plate 11, and a back surface side (rear surface) of the back plate 11. And a cover member 14 that covers the side). A cushion material (not shown) made of urethane or the like is fused to the back surface of the tension member 13.
The cover member 14 covering the back surface side of the back plate 11 is fixed to the back surface side of the back plate 11 by appropriate means such as uneven fitting. In the case of this embodiment, the upward extending portion 9 a of the backrest support frame 9 that rises upward from the rear side of the seat body 4 is fastened and fixed to the front side of the cover member 14. The front side of the upward extension 9 a of the support frame 9 is covered with a back plate 11.

座体４は、骨格部材を成す座板１５と、座板１５の上面側に配置されるクッション材５０（図５，図７参照）と、そのクッション材５０と座板１５の外周縁部の裏面の一部にかかる部位を覆う張材１６と、を備えている。
座フレーム５は、座体４の幅方向（左右方向）に沿って延出して座板１５の前部側下面を支持する前部支持軸１７と、座体４の幅方向に沿って延出して座板１５の後部側下面を支持する後部支持軸１８と、前部支持軸１７と後部支持軸１８の左側の端部同士と右側の端部同士をそれぞれ連結するとともに、座板１５の左右の側辺部の下面に結合される一対の連結プレート１９と、を備えている。 The seat body 4 includes a seat plate 15 constituting a skeleton member, a cushion material 50 (see FIGS. 5 and 7) disposed on the upper surface side of the seat plate 15, and an outer peripheral edge portion of the cushion material 50 and the seat plate 15. And a tension member 16 that covers a portion of the back surface.
The seat frame 5 extends along the width direction (left-right direction) of the seat body 4, and extends along the width direction of the seat body 4, and a front support shaft 17 that supports the front-side lower surface of the seat plate 15. The rear support shaft 18 that supports the rear lower surface of the seat plate 15, the left and right ends of the front support shaft 17 and the rear support shaft 18 are connected to each other, and the left and right sides of the seat plate 15 are connected to each other. And a pair of connecting plates 19 coupled to the lower surface of the side portion of the.

座フレーム５の前部支持軸１７は、支基３の前縁部を幅方向に貫通して、支基３に回動可能、かつ前後移動可能に支持されている。具体的には、支基３の前縁部には、前端部から斜め後方側に傾斜したガイド孔２１が設けられ、前部支持軸１７がそのガイド孔２１に回動可能、かつスライド可能に支持されている。また、前部支持軸１７は、支基３の内部においては図示しない付勢スプリングによって常時前方側に付勢されている。
一方、座フレーム５の後部支持軸１８は、支基３の後部上方側に配置され、左右の両縁部が左右の背凭れ支持フレーム９の各前方延出部９ｂの上面に、軸受部材５１と取付ブラケット２２を介して回動可能に支持されている。したがって、この座フレーム５においては、背凭れ部６が背凭れ支持フレーム９の前端の枢支軸１２を中心として後方側に傾動すると、前方延出部９ｂの下方側への傾動によって後部支持軸１８が後部斜め下方側に引っ張られ、それに伴って前部支持軸１７が支基３のガイド孔２１内を斜め後ろ下方にスライド移動する。座体４は、座フレーム５のこの動作により、背凭れ部６の傾動に追従して斜め後ろ下方に変位するように姿勢を変化させる。
なお、この実施形態においては、脚部２、支基３、背凭れ支持フレーム９、座フレーム５等によって椅子本体が構成されている。 The front support shaft 17 of the seat frame 5 passes through the front edge of the support base 3 in the width direction, and is supported by the support base 3 so as to be rotatable and movable back and forth. Specifically, a guide hole 21 inclined obliquely rearward from the front end portion is provided at the front edge portion of the support base 3 so that the front support shaft 17 can rotate and slide into the guide hole 21. It is supported. Further, the front support shaft 17 is always urged forward by a biasing spring (not shown) inside the support base 3.
On the other hand, the rear support shaft 18 of the seat frame 5 is disposed on the rear upper side of the support base 3, and both left and right edges are on the upper surface of each front extension 9 b of the left and right back support frames 9, and the bearing member 51 And is rotatably supported via the mounting bracket 22. Therefore, in the seat frame 5, when the backrest 6 is tilted rearward about the pivot shaft 12 at the front end of the backrest support frame 9, the rear support shaft is tilted downward by the forward extension 9 b. 18 is pulled diagonally downward on the rear side, and the front support shaft 17 slides diagonally backward and downward in the guide hole 21 of the support base 3 accordingly. With this operation of the seat frame 5, the seat body 4 changes its posture so as to be displaced obliquely rearward and downward following the tilting of the backrest portion 6.
In this embodiment, the leg body 2, the support base 3, the backrest support frame 9, the seat frame 5 and the like constitute a chair body.

図３は、座体４の座板１５を上方側から見た図であり、図４は、座板１５の図３のＩＶ−ＩＶ断面に対応する断面図、図５は、座体４と座フレーム５の図４の左半分の領域に対応する断面図である。また、図６は、座板１５の図３のＶＩ−ＶＩ断面に対応する断面図であり、図７は、座体４と座フレーム５の図６の左半分の領域に対応する断面図、図８は、座板１５の図３のＶＩＩＩ−ＶＩＩＩ断面に対応する断面図である。なお、図３においては、支基３と座フレーム５と背凭れ支持フレーム９の一部が鎖線で併せて示されている。
座板１５は、着座者の荷重を支持し得る強度を有する合成樹脂によって形成され、上面視では四隅が丸みを帯びた略長方形状とされている。座板１５の外周縁部は、上面と下面に複数の補強リブ２３が突設され、それによって上下方向（曲げ方向）や捩れ方向の剛性が高められている。この実施形態の場合、座板１５の外周縁部のうちの左右の側縁部が、座フレーム５（椅子本体）に直接支持される被支持部２４とされ、その左右の被支持部２４が剛性の高い座板１５の前縁部と後縁部とによって相互に連結されている。座フレーム５の前部支持軸１７と後部支持軸１８は、左右の両縁部が上方に向かって傾斜しており（図７参照）、その傾斜した各縁部が連結プレート１９を介して左右の被支持部２４の下面にボルト締結等によって連結されている。 3 is a view of the seat plate 15 of the seat body 4 as viewed from above, FIG. 4 is a cross-sectional view of the seat plate 15 corresponding to the IV-IV section of FIG. 3, and FIG. FIG. 5 is a cross-sectional view of the seat frame 5 corresponding to the left half region of FIG. 4. 6 is a cross-sectional view corresponding to the VI-VI cross section of FIG. 3 of the seat plate 15, and FIG. 7 is a cross-sectional view corresponding to the left half region of FIG. FIG. 8 is a cross-sectional view of the seat plate 15 corresponding to the VIII-VIII cross section of FIG. In FIG. 3, a part of the support base 3, the seat frame 5, and the backrest support frame 9 is shown together with a chain line.
The seat plate 15 is formed of a synthetic resin having a strength capable of supporting the load of the seated person, and has a substantially rectangular shape with rounded four corners when viewed from above. The outer peripheral edge of the seat plate 15 is provided with a plurality of reinforcing ribs 23 projecting from the upper surface and the lower surface, thereby increasing the rigidity in the vertical direction (bending direction) and torsional direction. In the case of this embodiment, the left and right side edge portions of the outer peripheral edge portion of the seat plate 15 are the supported portions 24 that are directly supported by the seat frame 5 (chair body), and the left and right supported portions 24 are The seat plate 15 having high rigidity is connected to each other by the front edge portion and the rear edge portion. The left and right edges of the front support shaft 17 and the rear support shaft 18 of the seat frame 5 are inclined upward (see FIG. 7), and each of the inclined edges is left and right via the connecting plate 19. It is connected to the lower surface of the supported portion 24 by bolt fastening or the like.

座板１５の左右の被支持部２４の間の領域には、座体４の上面中央に着座者が正規姿勢で着座したときに、着座者の臀部から荷重が直接入力される荷重受部２５が設けられている。荷重受部２５は上面視が略方形状の領域であり、その左右の側辺部は、後に詳述する肉薄の連結部２６を介して座板１５の被支持部２４に連結されている。
荷重受部２５の上面側は平坦に形成され、裏面側には荷重受部２５の上下方向の曲げ剛性と捩れ剛性を高めるために複数の補強リブ２７が形成されている。荷重受部２５は、着座者からの荷重入力方向（上下方向）の剛性が連結部２６の剛性よりも高剛性となっている。 In a region between the left and right supported parts 24 of the seat plate 15, when a seated person is seated in a normal posture at the center of the upper surface of the seat body 4, a load receiving part 25 to which a load is directly input from the seated person's buttocks. Is provided. The load receiving portion 25 is a region having a substantially rectangular shape when viewed from above, and the left and right side portions thereof are connected to the supported portion 24 of the seat plate 15 via a thin connecting portion 26 described in detail later.
The upper surface side of the load receiving portion 25 is formed flat, and a plurality of reinforcing ribs 27 are formed on the rear surface side in order to increase the bending rigidity and torsional rigidity of the load receiving portion 25 in the vertical direction. The load receiving portion 25 is higher in rigidity in the load input direction (vertical direction) from the seated person than the rigidity of the connecting portion 26.

座板１５の左右の連結部２６は、荷重受部２５の端部に接続され、荷重受部２５を通した着座者からの荷重入力（下方に向く荷重入力）によって隣接する被支持部２４の方向に伸び変形する第１変形部２８と、一端部が第１変形部２８に接続され他端部が隣接する被支持部２４に接続されるとともに、第１変形部２８を通した着座者からの荷重入力によって隣接する被支持部２４に向く方向で縮み変形する第２変形部２９と、を備えている。 The left and right connecting portions 26 of the seat plate 15 are connected to the end portions of the load receiving portion 25, and the adjacent supported portions 24 are connected by load input from the seated person (load input directed downward) through the load receiving portion 25. A first deformable portion 28 that extends and deforms in the direction, and one end connected to the first deformable portion 28 and the other end connected to the adjacent supported portion 24, and from a seated person through the first deformable portion 28 And a second deforming portion 29 that contracts and deforms in a direction toward the adjacent supported portion 24 by the load input.

連結部２６の第１変形部２８と第２変形部２９は、被支持部２４や荷重受部２５に比較して全域が薄肉に形成され、荷重受部２５に着座者の荷重が入力されたときに全域が柔軟に撓み変形するようになっている。また、座板１５のうちの、左右の各連結部２６の前端部と後端部にそれぞれ臨む位置には、各連結部２６が座板１５の前縁部と後縁部によって拘束を受けずに自由に変形し得るように、左右方向に延出するスリット３０が形成されている。また、各連結部２６の左右方向の幅は、前端側から後端側にかけて一定幅ではなく、前端側よりも後端側の領域の方が、幅が広くなるように設定されている。 The first deformable portion 28 and the second deformable portion 29 of the connecting portion 26 are formed thinner than the supported portion 24 and the load receiving portion 25, and the load of the seated person is input to the load receiving portion 25. Sometimes the entire area is flexibly deformed. Further, in the position of the seat plate 15 that faces the front end portion and the rear end portion of each of the left and right connection portions 26, the connection portions 26 are not restricted by the front edge portion and the rear edge portion of the seat plate 15. A slit 30 extending in the left-right direction is formed so as to be freely deformable. Further, the width in the left-right direction of each connecting portion 26 is not constant from the front end side to the rear end side, and is set so that the width of the region on the rear end side is wider than the front end side.

図４〜図７に示すように、第１変形部２８は、荷重受部２５の略水平な上面に対し、下方側に鈍角を成すように隣接する被支持部２４側に緩やかな円弧を描いて湾曲している。また、第２変形部２９は、上下方向に湾曲し上端側を頂部とした略Ｕ字状の凸状折り返し部２９ａを備えている。第１変形部２８の最下端部は、凸状折り返し部２９ａの座板１５の内側寄りの端部に滑らかな円弧を描いて接続されている。また、凸状折り返し部２９ａの座板１５の外側寄りの端部は同様に滑らかな円弧を描いて隣接する被支持部２４に連結されている。なお、この実施形態では、凸部が上に向く凸状折り返し部２９ａが一つだけ設けられているが、第２変形部２９は凸部が上に向く凸状折り返し部２９ａと凸部が下に向く凸状折り返し部２９ａが任意数連続する形状であっても良い。 As shown in FIGS. 4 to 7, the first deforming portion 28 draws a gentle arc on the side of the supported portion 24 adjacent to the substantially horizontal upper surface of the load receiving portion 25 so as to form an obtuse angle on the lower side. Is curved. Moreover, the 2nd deformation | transformation part 29 is provided with the substantially U-shaped convex folding | turning part 29a which curved in the up-down direction and made the upper end side the top part. The lowermost end portion of the first deformable portion 28 is connected to the end portion of the convex folded portion 29a closer to the inside of the seat plate 15 by drawing a smooth arc. Moreover, the edge part near the outer side of the seat plate 15 of the convex folding | turning part 29a is connected to the to-be-supported part 24 which draws a smooth circular arc similarly. In this embodiment, only one convex folded portion 29a with the convex portion facing upward is provided, but the second deformable portion 29 has the convex folded portion 29a with the convex portion facing upward and the convex portion at the bottom. Any number of convex folded portions 29a facing the surface may be continuous.

また、図５，図７に示すように、第２変形部２９の凸状折り返し部２９ａの上下方向での（荷重入力方向での）最大高低差は、第１変形部２８の上下方向での（荷重入力方向での）最大高低差よりも大きく設定されている。そして、第２変形部２９の凸状折り返し部２９ａは、頂部の稜線部ａを挟む二面が鋭角を成すように湾曲している。なお、この実施形態の場合、第１変形部２８と第２変形部２９は、荷重受部２５と被支持部２４に滑らかに連続するように円弧状の断面が連続する形状とされているが、第１変形部２８や第２変形部２９は必ずしも湾曲形状である必要はなく、屈曲した形状であっても良い。 As shown in FIGS. 5 and 7, the maximum height difference in the vertical direction (in the load input direction) of the convex folded portion 29 a of the second deformation portion 29 is the vertical direction of the first deformation portion 28. It is set larger than the maximum height difference (in the load input direction). And the convex folding | turning part 29a of the 2nd deformation | transformation part 29 is curving so that two surfaces which pinch | interpose the ridgeline part a of a top part may comprise an acute angle. In the case of this embodiment, the first deformable portion 28 and the second deformable portion 29 have a shape in which an arc-shaped cross section is continuous so as to be smoothly connected to the load receiving portion 25 and the supported portion 24. The first deformable portion 28 and the second deformable portion 29 do not necessarily have a curved shape, and may have a bent shape.

ここで、座板１５は、着座者から荷重受部２５に荷重が入力されると、連結部２６の第１変形部２８と第２変形部２９を左右方向に弾性変形させつつ、下方に沈み込むように変位しようとする。このとき、着座者の重心の直下位置となる荷重受部２５の後部側領域は、前部側領域に比較して大きな荷重を受けることになる。このため、この座板１５においては、後部側領域をよりスムーズに沈み込ませるように、荷重受部２５と座板１５の後縁部の間に左右方向に延出するスリット３１が設けられている。なお、左右の連結部２６の幅が前述のように前部側よりも後部側が広く設定されているのは、このスリット３１の機能とともに荷重受部２５の後部側領域をよりスムーズに沈み込ませるためである。 Here, when a load is input to the load receiving portion 25 from the seated person, the seat plate 15 sinks downward while elastically deforming the first deformation portion 28 and the second deformation portion 29 of the connecting portion 26 in the left-right direction. Try to displace it. At this time, the rear side region of the load receiving portion 25 that is located immediately below the center of gravity of the seated person receives a larger load than the front side region. For this reason, in this seat board 15, the slit 31 extended in the left-right direction is provided between the load receiving part 25 and the rear edge part of the seat board 15 so that a rear side area | region may sink more smoothly. Yes. The width of the left and right connecting portions 26 is set wider on the rear side than on the front side as described above, so that the rear side region of the load receiving portion 25 is submerged more smoothly together with the function of the slit 31. Because.

また、座板１５の荷重受部２５の裏面のうちの、座フレーム５の後部支持軸１８の直上位置には、下面側に凹状の当接面を有する規制凸部３２が突設されている。この規制凸部３２は、荷重受部２５の後部側領域が規定量以上に沈み込んだときに、図７中の二点鎖線で示すように、後部支持軸１８の中央領域の上面に当接することにより、荷重受部２５の後部側領域の過大な沈み込みを規制する。 Further, a regulating convex portion 32 having a concave contact surface on the lower surface side is projected from a position directly above the rear support shaft 18 of the seat frame 5 on the back surface of the load receiving portion 25 of the seat plate 15. . When the rear side region of the load receiving portion 25 sinks more than a predetermined amount, the restricting convex portion 32 comes into contact with the upper surface of the central region of the rear support shaft 18 as shown by a two-dot chain line in FIG. Thus, excessive sinking of the rear side region of the load receiving portion 25 is restricted.

つづいて、この実施形態の椅子１に着座者が着座したときにおける座板１５の挙動について詳細に説明する。
着座者が座板１５に着座して着座者の荷重が荷重受部２５にほぼ鉛直下方に作用すると、図５，図７中の二点鎖線で示すように、その荷重が左右の連結部２６の第１変形部２８に伝達されて第１変形部２８を左右に押し延ばすように弾性変形させ、その荷重を受ける第２変形部２９が隣接する被支持部２４方向に押し縮められるように弾性変形する。このとき、荷重受部２５は、連結部２６に比較して肉厚であるうえに、裏面側が補強リブ２７によって補強されていることから、大きな撓み変形を生じすることなく、連結部２６の弾性変形によって下方側に沈み込むように変位する。 Next, the behavior of the seat plate 15 when a seated person sits on the chair 1 of this embodiment will be described in detail.
When the seated person sits on the seat plate 15 and the load of the seated person acts on the load receiving portion 25 substantially vertically downward, the load is applied to the left and right connecting portions 26 as shown by two-dot chain lines in FIGS. The first deformable portion 28 is elastically deformed so as to be extended to the left and right, and the second deformable portion 29 receiving the load is elastically compressed in the direction of the adjacent supported portion 24. Deform. At this time, since the load receiving portion 25 is thicker than the connecting portion 26 and the back side is reinforced by the reinforcing rib 27, the elasticity of the connecting portion 26 does not occur without causing large deformation. It is displaced so as to sink downward by deformation.

以上のように、この実施形態に係る椅子１においては、座板１５の荷重受部２５の上下方向の剛性が連結部２６の剛性よりも高剛性に設定され、両側の連結部２６が、荷重受部２５側に接続されて荷重受部２５に着座者の荷重が入力されたときに、その荷重を受けて幅方向外側に伸び変形する第１変形部２８と、第１変形部２８と被支持部２４に接続されて第１変形部２８を通して着座者の荷重が伝達されたときに、被支持部２４方向に縮み変形する第２変形部２９と、を備えているため、着座者の着座時に荷重受部２５をほぼ平坦に維持したまま、荷重受部２５をスムーズに下方に変位させることができる。
したがって、この椅子１に着座した着座者は、荷重受部２５の沈み込みによって柔らかな着座感を得ることができるとともに、荷重受部２５の広い領域が平坦な状態に維持されて身体が両側方から圧迫されることがなくなるために、窮屈な着座感を受けることがない。 As described above, in the chair 1 according to this embodiment, the rigidity in the vertical direction of the load receiving portion 25 of the seat plate 15 is set to be higher than the rigidity of the connecting portion 26, and the connecting portions 26 on both sides are loaded. When a seated person's load is input to the load receiving portion 25 and connected to the receiving portion 25 side, the first deforming portion 28 that extends and deforms outward in the width direction in response to the load is received. And a second deforming portion 29 that contracts and deforms in the direction of the supported portion 24 when a load on the seated person is transmitted through the first deforming portion 28 connected to the support portion 24. Sometimes, the load receiving portion 25 can be smoothly displaced downward while keeping the load receiving portion 25 substantially flat.
Therefore, the seated person sitting on the chair 1 can obtain a soft seating feeling by the sinking of the load receiving portion 25, and a wide area of the load receiving portion 25 is maintained in a flat state, so that the body is positioned on both sides. Because it is no longer squeezed, you will not receive a tight seating feeling.

また、この実施形態に係る椅子１においては、上記の構成により、着座者の荷重が荷重受部２５に作用したときに、第１変形部２８の伸び変形を第２変形部２９の縮み変形で吸収するように連結部２６全体が弾性変形するため、座板１５の一部に大きな応力が作用し続けることによる座板１５の局部的な劣化を未然に防止することができる。 Further, in the chair 1 according to this embodiment, when the seated person's load acts on the load receiving portion 25, the first deformation portion 28 is deformed by the second deformation portion 29 by the above-described configuration. Since the entire connecting portion 26 is elastically deformed so as to absorb, local deterioration of the seat plate 15 due to large stress continuously acting on a part of the seat plate 15 can be prevented.

また、この実施形態の椅子１では、連結部２６の第１変形部２８が、荷重受部２５側から下方側に鈍角を成すように隣接する被支持部２４側に湾曲し、連結部２６の第２変形部２９が、水平方向と交差する方向にＵ字状に湾曲する凸状折り返し部２９ａを有する形状とされているため、第１変形部２８と第２変形部２９とが滑らかに連続した形状となる。このため、荷重受部２５から第１変形部２８に入力された荷重によって、第２変形部２９を効率良く縮み変形させることができる。 Moreover, in the chair 1 of this embodiment, the 1st deformation | transformation part 28 of the connection part 26 curves to the to-be-supported part 24 side adjacent so that an obtuse angle may be made from the load receiving part 25 side to the downward side, Since the 2nd deformation part 29 is made into the shape which has the convex folding | turning part 29a which curves in U shape in the direction which cross | intersects a horizontal direction, the 1st deformation part 28 and the 2nd deformation part 29 continue smoothly It becomes the shape. For this reason, the second deformation portion 29 can be efficiently contracted and deformed by the load input from the load receiving portion 25 to the first deformation portion 28.

特に、この実施形態の場合、第１変形部２８が、第２変形部２９の凸状折り返し部２９ａの荷重受部２５寄りで、荷重入力側から最も離反する位置に接続されているため、荷重受部２５の沈み込み初期はもとより荷重受部２５の沈み込み量が増大しても、第２変形部２９を第１変形部２８によって効率良く縮み変形させることができる。 In particular, in the case of this embodiment, the first deformation portion 28 is connected to the position farthest from the load input side near the load receiving portion 25 of the convex folded portion 29a of the second deformation portion 29. Even if the sinking amount of the load receiving portion 25 increases as well as the initial sinking of the receiving portion 25, the second deforming portion 29 can be efficiently contracted and deformed by the first deforming portion 28.

さらに、この実施形態では、第２変形部２９の凸状折り返し部２９ａの荷重入力方向での最大高低差が、第１変形部２８の荷重入力方向での最大高低差よりも大きく設定されているため、第２変形部２９を可及的に肉薄にせずに柔軟に縮み変形させることができる。このため、第２変形部２９の耐久性を高めることができる。また、第１変形部２８が荷重受部２５に近接した位置でスペースを大きく占有しなくなるため、座板１５の裏面側のスペース効率が高まる。 Furthermore, in this embodiment, the maximum height difference in the load input direction of the convex folded portion 29a of the second deformable portion 29 is set larger than the maximum height difference in the load input direction of the first deformable portion 28. Therefore, the second deformable portion 29 can be flexibly contracted and deformed without making it as thin as possible. For this reason, durability of the 2nd deformation part 29 can be improved. Further, since the first deforming portion 28 does not occupy a large space at a position close to the load receiving portion 25, the space efficiency on the back surface side of the seat plate 15 is increased.

また、この実施形態の椅子１においては、第２変形部２９の凸状折り返し部２９ａが、稜線部ａを挟む二面が鋭角を成すように形成されているため、荷重受部２５から第１変形部２８に入力された荷重によって第２変形部２９をより柔軟に変形させることができる。 Moreover, in the chair 1 of this embodiment, since the convex folding | turning part 29a of the 2nd deformation | transformation part 29 is formed so that the two surfaces which pinch | interpose the ridgeline part a may comprise an acute angle, it is 1st from the load receiving part 25. The second deformation part 29 can be deformed more flexibly by the load input to the deformation part 28.

なお、この発明は上記の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば、上記の実施形態は座体が荷重支持体を構成するものであるが、荷重支持体は座体に限らず、背凭れ部の背凭れ本体であっても良い。 In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the seat body constitutes the load support body, but the load support body is not limited to the seat body, and may be a backrest body of the backrest portion.

４座体（荷重支持体）
２４被支持部
２５荷重受部
２６連結部
２８第１変形部
２９第２変形部
２９ａ凸状折り返し部
ａ稜線部 4 Seat (load support)
24 supported portion 25 load receiving portion 26 connecting portion 28 first deforming portion 29 second deforming portion 29a convex folded portion a ridge line portion

Claims

椅子本体に支持される被支持部と、
該被支持部の内側に配置され、着座者の荷重を受ける荷重受部と、
前記被支持部と前記荷重受部とを連結する連結部と、
を有する荷重支持体を備え、
前記連結部の弾性変形が前記荷重受部の変位を助長する椅子において、
前記荷重受部は、着座者からの荷重入力方向の剛性が前記連結部の剛性よりも高剛性とされ、
前記連結部は、前記荷重受部に接続されるとともに、前記荷重受部を通した前記着座者からの荷重入力によって被支持部に向かう方向に伸び変形する第１変形部と、一端部が前記第１変形部に接続され他端部が前記被支持部に接続されるとともに、前記荷重受部と前記第1変形部を通した前記着座者からの荷重入力によって前記被支持部に向かう方向に縮み変形する第２変形部と、を備えていることを特徴とする椅子。 A supported part supported by the chair body;
A load receiving portion disposed inside the supported portion and receiving a load of a seated person;
A connecting portion for connecting the supported portion and the load receiving portion;
A load support having
In the chair in which the elastic deformation of the connecting portion promotes the displacement of the load receiving portion,
The load receiving portion has a rigidity in a load input direction from a seated person that is higher than the rigidity of the connecting portion,
The connecting portion is connected to the load receiving portion, and has a first deforming portion that extends and deforms in a direction toward the supported portion by a load input from the seated person through the load receiving portion, and one end portion of the connecting portion is Connected to the first deformable portion and the other end is connected to the supported portion, and in a direction toward the supported portion by a load input from the seated person through the load receiving portion and the first deformable portion. And a second deformable portion that contracts and deforms.

前記第１変形部は、前記荷重受部の荷重受面に対し、荷重入力側と逆側で鈍角を成すように前記被支持部側に湾曲若しくは屈曲して形成され、
前記第２変形部は、前記荷重受部の荷重受面と交差する方向に湾曲若しくは屈曲する折り返し形状を少なくとも一つ有していることを特徴とする請求項１に記載の椅子。 The first deforming portion is formed by bending or bending on the supported portion side so as to form an obtuse angle on the opposite side to the load input side with respect to the load receiving surface of the load receiving portion,
The chair according to claim 1, wherein the second deformable portion has at least one folded shape that is bent or bent in a direction intersecting with a load receiving surface of the load receiving portion.

前記第２変形部は、着座者からの荷重入力側に凸に湾曲若しくは屈曲する凸状折り返し部を有し、
前記第１変形部は、前記凸状折り返し部の前記荷重受部寄りで、かつ荷重入力側から最も離反する位置に接続され、
前記第２変形部の前記凸状折り返し部の前記荷重入力方向での最大高低差は、前記第１変形部の前記荷重入力方向での最大高低差よりも大きく設定されていることを特徴とする請求項２に記載の椅子。 The second deforming portion has a convex folded portion that curves or bends convexly on the load input side from the seated person,
The first deforming portion is connected to a position near the load receiving portion of the convex folded portion and farthest from the load input side,
The maximum height difference in the load input direction of the convex folded portion of the second deformable portion is set larger than the maximum height difference in the load input direction of the first deformable portion. The chair according to claim 2.

前記第２変形部の折り返し形状部分は、稜線部を挟む二面が鋭角を成すように形成されていることを特徴とする請求項２または３に記載の椅子。 The chair according to claim 2 or 3, wherein the folded portion of the second deformable portion is formed so that two surfaces sandwiching the ridge portion form an acute angle.