JP2021053221A

JP2021053221A - Chair

Info

Publication number: JP2021053221A
Application number: JP2019180321A
Authority: JP
Inventors: 勝好青木; Katsuyoshi Aoki
Original assignee: Plus Corp
Current assignee: Plus Corp
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-04-08
Anticipated expiration: 2039-09-30
Also published as: JP7015566B2

Abstract

To provide a chair with a slidable seating surface that does not move forward and backward unintentionally during seating.SOLUTION: A chair 1 has a base member 51 comprising a chevron-shaped engaged part 51f and a side wall part 512, an inner seat 52 provided in the base member so as to be movable forward and backward and comprising a chevron-shaped engaging part 52e and a protrusion part 52f formed so as to be engageable with the chevron-shaped engaged part 51f and the side wall part 512, and an outer seat 53 provided in the inner seat 52 and having a seating surface 53a formed on an upper surface thereof. The chevron-shaped engaged part 51f, the chevron-shaped engaging part 52e, and the like regulate the forward/backward movement of the inner seat 52 by a downward load on the inner seat 52 due to seating on the seating surface.SELECTED DRAWING: Figure 1

Description

本発明は、座面がスライドする椅子に関する。 The present invention relates to a chair with a sliding seat surface.

従来から、使用者の体格差に応じて座面の前後位置を調節できるように座面がスライドする椅子が開示されている。特許文献１に開示される椅子は、着座者からの荷重を受け止める荷重受け面を有したアウターシェルと、該アウターシェルの上に前後方向にスライド移動可能に設けられるインナーシェルと、を備える。インナーシェルには座面を有するクッションが設けられる。アウターシェルの荷重受け面には、漸次上昇する傾斜部分が形成される。インナーシェルは、スライド位置決め機構により所望のスライド位置に移動させてロックすることができる。所望のスライド位置に移動されたインナーシェルは、漸次上昇する傾斜部分により、着座者の前方のずれを抑制することができると共に、着座時のフィット感が向上されている。 Conventionally, a chair in which the seat surface slides so that the front-rear position of the seat surface can be adjusted according to the difference in body size of the user has been disclosed. The chair disclosed in Patent Document 1 includes an outer shell having a load receiving surface for receiving a load from a seated person, and an inner shell provided on the outer shell so as to be slidable in the front-rear direction. The inner shell is provided with a cushion having a seating surface. An inclined portion that gradually rises is formed on the load receiving surface of the outer shell. The inner shell can be moved to a desired slide position and locked by the slide positioning mechanism. The inner shell that has been moved to the desired slide position can suppress the front displacement of the seated person due to the gradually rising inclined portion, and the fit feeling at the time of sitting is improved.

特許第６１３５０９８号公報Japanese Patent No. 613598

座面の前後の位置調整の際、着座して背凭れに凭れた状態では、背の反力により座に前方の力が働いているため、スライド位置決め機構のロックを解除すると意図せず座が移動する等して、意図通りに座面を移動させるのが難しい場合がある。 When adjusting the position of the front and rear of the seat surface, when the seat is seated and leans against the backrest, the front force acts on the seat due to the reaction force of the back, so when the slide positioning mechanism is unlocked, the seat unintentionally opens. It may be difficult to move the seat surface as intended, such as by moving it.

本発明は、着座時には意図せず座面が前後移動しない座面スライド可能な椅子を提供することを目的とする。 An object of the present invention is to provide a chair having a slidable seat surface in which the seat surface does not unintentionally move back and forth when seated.

本発明に係る椅子は、被係合部を備えるベース部材と、前記ベース部材に前後移動可能に設けられ、前記被係合部と係合可能に形成される係合部を備えるインナシートと、前記インナシートに設けられ、上面に座面が形成されるアウタシートと、を有し、前記被係合部及び前記係合部は、前記座面への着座による前記インナシートへの下方向荷重により前記係合部の前後移動を規制する、ことを特徴とする。 The chair according to the present invention includes a base member having an engaged portion, an inner seat provided on the base member so as to be movable back and forth, and an inner seat including an engaging portion formed so as to be engageable with the engaged portion. It has an outer seat provided on the inner seat and a seat surface is formed on the upper surface thereof, and the engaged portion and the engaging portion are subjected to a downward load on the inner seat due to seating on the seat surface. It is characterized in that the back-and-forth movement of the engaging portion is restricted.

本発明によれば、本発明は、着座時には意図せず座面が前後移動しない座面スライド可能な椅子を提供することができる。 According to the present invention, the present invention can provide a chair with a slidable seat surface in which the seat surface does not unintentionally move back and forth when seated.

本発明の実施形態に係る椅子を示す図であり、（ａ）は前方左側から見た斜視図であり、（ｂ）は前方左側から見た分解斜視図である。It is a figure which shows the chair which concerns on embodiment of this invention, (a) is a perspective view seen from the front left side, (b) is an exploded perspective view seen from the front left side. 本発明の実施形態に係る椅子のベース部材を上方左側から見た斜視図である。It is a perspective view which looked at the base member of the chair which concerns on embodiment of this invention from the upper left side. 本発明の実施形態に係る椅子のインナシートを上方側から見た斜視図である。It is a perspective view which looked at the inner seat of the chair which concerns on embodiment of this invention from the upper side. 本発明の実施形態に係る椅子のインナシートを下方側から見た斜視図である。It is a perspective view which looked at the inner seat of the chair which concerns on embodiment of this invention from the lower side. 本発明の実施形態に係る椅子のレバー周辺を上方から見たレバーとベース部材とを示す平面図である。It is a top view which shows the lever and the base member which looked at the periphery of the lever of the chair which concerns on embodiment of this invention from above. 本発明の実施形態に係る椅子のベース部材とインナシートにおける図２のＶＩ−ＶＩ断面に相当する断面図である。本図では、インナシートは後端に位置している。FIG. 5 is a cross-sectional view corresponding to the VI-VI cross section of FIG. 2 in the base member and inner seat of the chair according to the embodiment of the present invention. In this figure, the inner sheet is located at the rear end. 本発明の実施形態に係る椅子のベース部材とインナシートにおける図２のＶＩＩ−ＶＩＩ断面に相当する断面図である。本図では、インナシートは後端に位置している。FIG. 5 is a cross-sectional view corresponding to the VII-VII cross section of FIG. 2 in the base member and inner seat of the chair according to the embodiment of the present invention. In this figure, the inner sheet is located at the rear end. 本発明の実施形態に係る椅子のベース部材とインナシートにおける図３のＶＩＩＩ−ＶＩＩＩ断面に相当する断面図である。本図では、インナシートは後端に位置している。FIG. 5 is a cross-sectional view corresponding to the VIII-VIII cross section of FIG. 3 in the base member and inner seat of the chair according to the embodiment of the present invention. In this figure, the inner sheet is located at the rear end. 本発明の実施形態に係る椅子のベース部材とインナシートにおける図３のＩＸ−ＩＸ断面に相当する断面図である。本図では、インナシートは前端に位置している。FIG. 5 is a cross-sectional view corresponding to the IX-IX cross section of FIG. 3 in the base member and inner seat of the chair according to the embodiment of the present invention. In this figure, the inner sheet is located at the front end.

次に、本発明の実施形態を図に基づいて説明する。図１（ａ），（ｂ）に示すように、本発明の実施形態に係る椅子１は、脚部１０と、昇降機構と、ロッキング機構３０と、背凭れ４０と、座５０と、を備える。なお、以下の説明においては、着座状態で見た前方側を前、その反対側を後として、椅子１の上方を上、下方を下とし、着座状態における左手側を左、右手側を右として説明する。 Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1A and 1B, the chair 1 according to the embodiment of the present invention includes a leg 10, an elevating mechanism, a locking mechanism 30, a backrest 40, and a seat 50. .. In the following description, the front side as seen in the seated state is the front, the opposite side is the rear, the upper side of the chair 1 is the upper side, the lower side is the lower side, the left hand side in the seated state is the left, and the right hand side is the right. explain.

脚部１０は、放射状に延設される５本の脚杆１１が設けられ、各脚杆１１には、キャスター１２が設けられる。脚部１０の中央の支柱１３は、ガススプリング等を備える公知の構造の昇降機構が備えられている。支柱１３はロッキング機構３０を介して座５０を支持する。ロッキング機構３０の昇降レバー３２の回動操作で支柱１３の昇降機構のロックを解除することにより座５０の上下方向の位置を調節することができる。 The leg portion 10 is provided with five leg rods 11 extending radially, and each leg rod 11 is provided with a caster 12. The central column 13 of the leg 10 is provided with an elevating mechanism having a known structure including a gas spring or the like. The support column 13 supports the seat 50 via the rocking mechanism 30. The vertical position of the seat 50 can be adjusted by unlocking the elevating mechanism of the support column 13 by rotating the elevating lever 32 of the locking mechanism 30.

ロッキング機構３０は、コイルスプリング等を内装する公知の構造で構成されて、背凭れ４０の背アーム４１と接続する。そして、ロッキング切替レバー３１を回動させて、背凭れ４０のロッキングの固定・フリーを切り替え操作することができる。 The rocking mechanism 30 has a known structure in which a coil spring or the like is housed, and is connected to the back arm 41 of the backrest 40. Then, the locking switching lever 31 can be rotated to switch between fixing and free locking of the backrest 40.

座５０は、ロッキング機構３０の上方に接続するベース部材５１と、ベース部材５１の上面部に前後移動可能に設けられるインナシート５２と、インナシート５２の上面部５２０に設けられてクッション材料に布が被せられて形成されるアウタシート５３と、を備える。アウタシート５３は、インナシート５２の変形部５２ｂに倣って変形可能な座面５３ａを上面に備える。インナシート５２には、座面５３ａの前後方向の位置を調節するためのスライドレバー５４を備える。 The seat 50 is provided on the base member 51 connected above the locking mechanism 30, the inner seat 52 provided on the upper surface portion of the base member 51 so as to be movable back and forth, and the upper surface portion 520 of the inner seat 52 as a cushion material. The outer sheet 53, which is formed by being covered with the outer sheet 53, is provided. The outer seat 53 is provided with a seat surface 53a on the upper surface that can be deformed in accordance with the deformed portion 52b of the inner seat 52. The inner seat 52 is provided with a slide lever 54 for adjusting the position of the seat surface 53a in the front-rear direction.

図２に示すように、ベース部材５１は、上面部５１０側が開放される略シェル状とされ、上面部５１０の左右方向は凹湾曲状に形成されるベース部材本体５１ａを備える。ベース部材本体５１ａの内部には、前後方向に延設される複数の縦壁部５１１と、左右方向に延設される複数の横壁部５１２を備える。複数の縦壁部５１１及び複数の横壁部５１２は、薄い板状のリブとして形成される。複数の縦壁部５１１及び複数の横壁部５１２により、ベース部材５１のベース部材本体５１ａの内部は、上面部５１０側が開口する複数のセル状に形成される。従って、ベース部材５１は、軽量かつ高剛性に形成される。ベース部材５１の上面（上面部５１０）は、各縦壁部５１１及び横壁部５１２の上面により形成される。 As shown in FIG. 2, the base member 51 includes a base member main body 51a formed in a substantially shell shape in which the upper surface portion 510 side is open, and a concave curved shape in the left-right direction of the upper surface portion 510. Inside the base member main body 51a, a plurality of vertical wall portions 511 extending in the front-rear direction and a plurality of horizontal wall portions 512 extending in the left-right direction are provided. The plurality of vertical wall portions 511 and the plurality of horizontal wall portions 512 are formed as thin plate-shaped ribs. The inside of the base member main body 51a of the base member 51 is formed into a plurality of cells having an opening on the upper surface portion 510 side by the plurality of vertical wall portions 511 and the plurality of horizontal wall portions 512. Therefore, the base member 51 is formed to be lightweight and highly rigid. The upper surface (upper surface portion 510) of the base member 51 is formed by the upper surfaces of the vertical wall portions 511 and the horizontal wall portions 512.

ベース部材５１の上面部５１０の後方側には、略すり鉢状とされる凹状の坐骨保持部５１ｂが形成される。坐骨保持部５１ｂは、２点鎖線で示すように、人の坐骨周辺の形状に合わせて、上面視において縁線が左右に長い略楕円形状とされる。従って、坐骨保持部５１ｂの上面部５１０ａは、該楕円形状の中心から前後、左右に亘って漸次高くなるよう形成される。 On the posterior side of the upper surface portion 510 of the base member 51, a concave sciatica holding portion 51b having a substantially mortar shape is formed. As shown by the alternate long and short dash line, the ischial holding portion 51b has a substantially elliptical shape with long left and right edge lines in the top view, in accordance with the shape around the human ischium. Therefore, the upper surface portion 510a of the ischial bone holding portion 51b is formed so as to gradually rise from the center of the elliptical shape in the anterior-posterior and lateral directions.

坐骨保持部５１ｂの上面部５１０ａの左右方向は、ベース部材５１の左右方向の中心に対して対称な略凹湾曲状に形成される。坐骨保持部５１ｂの上面部５１０ａの前後方向は、略凹湾曲状に形成される。具体的には、坐骨保持部５１ｂの上面部５１０ａは、図７に示す前後方向の断面における、坐骨保持部５１ｂの上面部５１０ａの最深部ＤＰから前後方向の所定距離Ｓにおける最深部ＤＰからの高さが、前部（高さＦＨ）よりも後部（高さＲＨ）が高くなるよう形成される。ＦＨ＜ＲＨの関係は、坐骨保持部５１ｂにおけるほぼ全ての前後方向の断面において成り立っている。換言すれば、坐骨保持部５１ｂは、後方側の傾斜よりも前方側の傾斜が緩く形成されている部位を有する。 The left-right direction of the upper surface portion 510a of the ischial bone holding portion 51b is formed in a substantially concave curved shape symmetrical with respect to the center of the base member 51 in the left-right direction. The anterior-posterior direction of the upper surface portion 510a of the ischial bone holding portion 51b is formed in a substantially concave curved shape. Specifically, the upper surface portion 510a of the ischial bone holding portion 51b is from the deepest portion DP at a predetermined distance S in the anterior-posterior direction from the deepest portion DP of the upper surface portion 510a of the ischial bone holding portion 51b in the anteroposterior cross section shown in FIG. The height is formed so that the rear part (height RH) is higher than the front part (height FH). The relationship of FH <RH holds in almost all anterior-posterior cross sections of the ischial holding portion 51b. In other words, the ischial holding portion 51b has a portion where the anterior side inclination is formed more gently than the posterior side inclination.

また、図２に示すように、ベース部材５１の坐骨保持部５１ｂ以外の上面部５１０は、基本スライド面５１ｃが形成される。基本スライド面５１ｃは、前後方向の断面視において略直線状に前傾して形成される。図７に示すように、基本スライド面５１ｃが前傾する角度θ１は、水平面に対して約３度〜約５度の範囲で設定される。このようにして、坐骨保持部５１ｂの前方側及び後方側を含む坐骨保持部５１ｂの周囲の上面部５１０は、前後方向に傾斜して形成される。 Further, as shown in FIG. 2, a basic slide surface 51c is formed on the upper surface portion 510 of the base member 51 other than the sciatica holding portion 51b. The basic slide surface 51c is formed so as to be tilted forward in a substantially straight line in a cross-sectional view in the front-rear direction. As shown in FIG. 7, the angle θ1 at which the basic slide surface 51c tilts forward is set in the range of about 3 degrees to about 5 degrees with respect to the horizontal plane. In this way, the upper surface portion 510 around the ischial bone holding portion 51b including the anterior side and the posterior side of the ischial bone holding portion 51b is formed so as to be inclined in the anteroposterior direction.

なお、坐骨保持部５１ｂは、その中心部分で坐骨を受ける坐骨受面が形成され、該坐骨受面の周囲には骨盤を支持する骨盤受面が形成される。また、坐骨保持部５１ｂと基本スライド面５１ｃとの間の領域には、両者を滑らかに接続する接続面が形成される。 In the ischial holding portion 51b, a ischial receiving surface for receiving the ischium is formed at the central portion thereof, and a pelvis receiving surface for supporting the pelvis is formed around the ischial receiving surface. Further, in the region between the ischial bone holding portion 51b and the basic slide surface 51c, a connecting surface for smoothly connecting the two is formed.

また、図２に示すように、ベース部材５１は、上方に突出するように、左右・前後の４か所に第１ガイド部５１ｄ（ガイド部）が設けられる。第１ガイド部５１ｄは、前後方向から見て略Ｔ字状に形成されるよう上面視矩形の頭部５１ｄ１が基板５１ｄ２の上端に形成される。基板５１ｄ２は、後述するインナシート５２のスリット５２ｃ２と係合してインナシート５２を案内する（図６も参照）。このようにして、ベース部材５１の前方側左右２か所及び坐骨保持部５１ｂの側方左右２か所の合計４か所に第１ガイド部５１ｄが形成される。 Further, as shown in FIG. 2, the base member 51 is provided with first guide portions 51d (guide portions) at four locations on the left, right, front and back so as to project upward. In the first guide portion 51d, a head portion 51d1 having a rectangular top view is formed at the upper end of the substrate 51d2 so as to be formed in a substantially T shape when viewed from the front-rear direction. The substrate 51d2 engages with the slit 52c2 of the inner sheet 52, which will be described later, to guide the inner sheet 52 (see also FIG. 6). In this way, the first guide portions 51d are formed at two locations on the front side of the base member 51 and two locations on the left and right sides of the ischial bone holding portion 51b, for a total of four locations.

一方、ベース部材５１の左右方向の中央部であって、後方の第１ガイド部５１ｄよりも更に後方には、第２ガイド部５１ｅ（ガイド部）が設けられる。第２ガイド部５１ｅは、第１ガイド部５１ｄと同様に、上面視矩形の頭部５１ｅ１が基板５１ｅ２の上端に形成されて前後方向から見て略Ｔ字状に形成される。基板５１ｅ２は、インナシート５２のスリット５２ｄ２を案内する（図７も参照）。 On the other hand, a second guide portion 51e (guide portion) is provided at the center portion in the left-right direction of the base member 51 and further behind the first guide portion 51d at the rear. Similar to the first guide portion 51d, the second guide portion 51e has a top-view rectangular head 51e1 formed at the upper end of the substrate 51e2 and is formed in a substantially T shape when viewed from the front-rear direction. The substrate 51e2 guides the slit 52d2 of the inner sheet 52 (see also FIG. 7).

第２ガイド部５１ｅの基部から前方に延びる縦壁部５１１の上面は、後述するインナシート５２の第２スライド部５２ｄの受け部５１ｅ３とされる。受け部５１ｅ３は前述のθ１よりも大きく前傾して傾斜し、第２スライド部５２ｄが周囲の撓みに合わせて傾くことができるようにしている。このとき、第２ガイド部５１ｅにより、インナシート５２の後方側の浮き上がりが抑制される。なお、図２において二点鎖線で示す第１スライド部５２ｃ、第２スライド部５２ｄは、第１スライド部５２ｃ、第２スライド部５２ｄがインナシート５２の下面から突出する外形を表している。 The upper surface of the vertical wall portion 511 extending forward from the base portion of the second guide portion 51e is a receiving portion 51e3 of the second slide portion 52d of the inner sheet 52, which will be described later. The receiving portion 51e3 is tilted forward more than the above-mentioned θ1 so that the second slide portion 52d can be tilted according to the bending of the surroundings. At this time, the second guide portion 51e suppresses the lifting of the inner sheet 52 on the rear side. The first slide portion 52c and the second slide portion 52d shown by the alternate long and short dash line in FIG. 2 represent the outer shape in which the first slide portion 52c and the second slide portion 52d protrude from the lower surface of the inner sheet 52.

ベース部材５１の左側縁付近の前方には、インナシート５２及びアウタシート５３（すなわち、アウタシート５３の座面５３ａ）の前後のスライド位置決め用のスライドレバー５４と係合する位置決め部５４ａが形成される。位置決め部５４ａは、四角柱状の規制柱５４ａ１が等ピッチで前後方向に複数形成されている（図５も参照）。規制柱５４ａ１のピッチが、インナシート５２（アウタシート５３）の移動ピッチとなる。 A positioning portion 54a that engages with the slide lever 54 for front and rear slide positioning of the inner seat 52 and the outer seat 53 (that is, the seat surface 53a of the outer seat 53) is formed in front of the base member 51 near the left edge. In the positioning portion 54a, a plurality of square columnar regulating columns 54a1 are formed at equal pitches in the front-rear direction (see also FIG. 5). The pitch of the regulation pillar 54a1 is the movement pitch of the inner seat 52 (outer seat 53).

ベース部材５１の上面部５１０の前方（すなわち、前方側の基本スライド面５１ｃ）には、被係合部である山形被係合部５１ｆが左右それぞれ２か所（合計４か所）に設けられる。各山形被係合部５１ｆは、一の縦壁部５１１の上面に形成されるものであり、該縦壁部５１１の上面が前後方向に連続する側面視山形状に形成される。 In front of the upper surface portion 510 of the base member 51 (that is, the basic slide surface 51c on the front side), chevron engaged portions 51f, which are engaged portions, are provided at two locations on the left and right (a total of four locations). .. Each chevron engaged portion 51f is formed on the upper surface of one vertical wall portion 511, and the upper surface of the vertical wall portion 511 is formed in a side view mountain shape continuous in the front-rear direction.

図３、図４に示すように、インナシート５２は、略板状に形成される。インナシート５２の外周縁部には、複数のノッチ５２ａが設けられる。ノッチ５２ａにより、アウタシート５３の布の縁が、通常使用時の外観上見えないように押えられている。 As shown in FIGS. 3 and 4, the inner sheet 52 is formed in a substantially plate shape. A plurality of notches 52a are provided on the outer peripheral edge of the inner sheet 52. The notch 52a presses the edge of the cloth of the outer sheet 53 so that it cannot be seen from the outside during normal use.

インナシート５２の左側の縁部近傍前方寄りには、スライドレバー５４が回動自在に設けられる。図５にも示すように、スライドレバー５４は、インナシート５２の外周から突出する操作板部５４ｂと、係合板部５４ｃを備える。操作板部５４ｂと係合板部５４ｃは、各板状の端部が回動軸５４ｄを介して所定角度で交差する。係合板部５４ｃには、ベース部材５１の位置決め部５４ａの規制柱５４ａ１と係合可能な凹部を有するロック部５４ｃ１が形成される。スライドレバー５４は、回動軸５４ｄに図示しないねじりコイルバネが巻回されて、ロック部５４ｃ１と規制柱５４ａ１が係合する方向（操作板部５４ｂが下方に回動する方向）に付勢されている。このようにして、インナシート５２の前後移動を等ピッチで移動させてロック可能なスライドロック機構５４０が形成される。 A slide lever 54 is rotatably provided near the front edge on the left side of the inner seat 52. As shown in FIG. 5, the slide lever 54 includes an operation plate portion 54b protruding from the outer periphery of the inner sheet 52 and an engagement plate portion 54c. The operation plate portion 54b and the engagement plate portion 54c have their plate-shaped ends intersecting each other at a predetermined angle via the rotation shaft 54d. The engaging plate portion 54c is formed with a lock portion 54c1 having a recess that can be engaged with the regulation pillar 54a1 of the positioning portion 54a of the base member 51. The slide lever 54 is urged in a direction in which a torsion coil spring (not shown) is wound around a rotation shaft 54d and the lock portion 54c1 and the regulation pillar 54a1 are engaged (the direction in which the operation plate portion 54b rotates downward). There is. In this way, the slide lock mechanism 540 that can be locked by moving the inner seat 52 back and forth at equal pitches is formed.

インナシート５２は、ベース部材５１の坐骨保持部５１ｂに倣って変形可能な変形部５２ｂを備える。変形部５２ｂは、坐骨保持部５１ｂに対応して位置される。変形部５２ｂは、略ブーメラン形状の孔部５２ｂ１を複数備える。一部の孔部５２ｂ１は、ブーメラン形状の一部のみの形状で開口される（例えば孔部５２ｂ２）。変形部５２ｂは、頂部を前後方向に向けた複数の孔部５２ｂ１が前後方向に並び、左右方向に隣り合う列の複数の孔部５２ｂ１とは頂部を反対側に向けて、隣接する孔部５２ｂ１同士が近接して（前後方向から見てオーバーラップするように）配置される。複数の孔部５２ｂ１の一部は、隣り合う孔部５２ｂ１同士が連結し、他の一部は、隣り合う孔部５２ｂ１同士が重ならない（接続しない）よう近接している。複数の孔部５２ｂ１の間は、平面視略波形状とされる梁状部５２ｂ３が形成される。このようにして、変形部５２ｂは、着座時に変形可能な程度の可撓性を備える。 The inner sheet 52 includes a deformable portion 52b that can be deformed following the sciatica holding portion 51b of the base member 51. The deformed portion 52b is positioned corresponding to the ischial holding portion 51b. The deformed portion 52b includes a plurality of substantially boomerang-shaped hole portions 52b1. A part of the hole 52b1 is opened in the shape of only a part of the boomerang shape (for example, the hole 52b2). In the deformed portion 52b, a plurality of hole portions 52b1 having the tops directed in the front-rear direction are arranged in the front-rear direction, and the tops of the deformed portions 52b are opposite to the plurality of hole portions 52b1 in a row adjacent to each other in the left-right direction. They are placed close to each other (so that they overlap when viewed from the front-back direction). A part of the plurality of hole portions 52b1 is connected to each other by adjacent hole portions 52b1, and the other part is close to each other so that the adjacent hole portions 52b1 do not overlap (do not connect). A beam-shaped portion 52b3 having a substantially wavy shape in a plan view is formed between the plurality of hole portions 52b1. In this way, the deformable portion 52b has flexibility to the extent that it can be deformed when seated.

インナシート５２の前側左右２か所、後側左右２か所（合計４か所）には、第１スライド部５２ｃ（スライド部）が設けられる。インナシート５２の中央部後方には、第２スライド部５２ｄ（スライド部）が設けられる。第１スライド部５２ｃ及び第２スライド部５２ｄは、それぞれベース部材５１の第１ガイド部５１ｄ、第２ガイド部５１ｅが係合する。第１スライド部５２ｃ及び第２スライド部５２ｄは、それぞれ、第１ガイド部５１ｄ、第２ガイド部５１ｅの頭部５１ｄ１，５１ｅ１が挿通される矩形の通し孔５２ｃ１，５２ｄ１が形成される。通し孔５２ｃ１，５２ｄ１には、それぞれ前後方向に長いスリット５２ｃ２，５２ｄ２が接続する。スリット５２ｃ２，５２ｄ２は、第１ガイド部５１ｄ、第２ガイド部５１ｅの基板５１ｄ２，５１ｅ２が挿通され案内される（図６、図７参照）。 The first slide portion 52c (slide portion) is provided at two locations on the front left and right sides of the inner sheet 52 and two locations on the rear side left and right (four locations in total). A second slide portion 52d (slide portion) is provided behind the central portion of the inner sheet 52. The first slide portion 52c and the second slide portion 52d are engaged with the first guide portion 51d and the second guide portion 51e of the base member 51, respectively. The first slide portion 52c and the second slide portion 52d are formed with rectangular through holes 52c1 and 52d1 through which the heads 51d1 and 51e1 of the first guide portion 51d and the second guide portion 51e are inserted, respectively. Slits 52c2 and 52d2, which are long in the front-rear direction, are connected to the through holes 52c1 and 52d1, respectively. The slits 52c2 and 52d2 are guided by inserting the substrates 51d2 and 51e2 of the first guide portion 51d and the second guide portion 51e (see FIGS. 6 and 7).

第１スライド部５２ｃ及び第２スライド部５２ｄは、下面側に突出して形成される。第１スライド部５２ｃは、着座時に変形部５２ｂが凹状に変形すると、インナシート５２の左右方向の中心に向けて引っ張られて移動するが、下面に突出する第１スライド部５２ｃの面と対向する、ベース部材５１の縦壁部５１１（具体的には、左右外側の山形被係合部５１ｆが形成される縦壁部５１１）の面が当接して、第１スライド部５２ｃの該移動は規制される（図２も参照）。 The first slide portion 52c and the second slide portion 52d are formed so as to project toward the lower surface side. When the deformed portion 52b is deformed in a concave shape when seated, the first slide portion 52c is pulled toward the center of the inner sheet 52 in the left-right direction and moves, but faces the surface of the first slide portion 52c protruding to the lower surface. , The surface of the vertical wall portion 511 of the base member 51 (specifically, the vertical wall portion 511 on which the left and right outer chevron engaged portions 51f are formed) comes into contact with each other, and the movement of the first slide portion 52c is restricted. (See also Figure 2).

インナシート５２の下面には、前方側の左右それぞれ２か所（合計４か所）に山形係合部５２ｅが形成される。図８に示すように、係合部である各山形係合部５２ｅは、ベース部材５１において対応する各山形被係合部５１ｆと同形状に形成されて係合可能に形成される。各山形係合部５２ｅ及び各山形被係合部５１ｆの山形形状のピッチは、スライドロック機構５４０におけるインナシート５２の移動ピッチ（規制柱５４ａ１の前後方向のピッチ）と略同一に形成される。非着座時には、各山形係合部５２ｅと各山形被係合部５１ｆは係合して当接しているが、インナシート５２の移動時には、各山形係合部５２ｅは容易に各山形被係合部５１ｆを乗り越えて移動することができる。ここで、インナシート５２の前後方向の移動ピッチ（すなわち、規制柱５４ａ１が並ぶピッチ）と各山形係合部５２ｅ及び各山形被係合部５１ｆのピッチを略同一としているので、インナシート５２は、各山形係合部５２ｅと各山形被係合部５１ｆが係合する位置をロック可能な位置（スライドレバー５４のロック部５４ｃ１が規制柱５４ａ１に係合する位置）として確実に位置決めすることができる。一方着座時には、各山形係合部５２ｅと各山形被係合部５１ｆは、着座によりインナシート５２が下方向荷重を受けると、互いに押圧して係合するので、インナシート５２の前後方向の移動が規制される。 On the lower surface of the inner sheet 52, chevron engaging portions 52e are formed at two locations (four locations in total) on the left and right sides on the front side. As shown in FIG. 8, each chevron engaging portion 52e, which is an engaging portion, is formed in the same shape as each chevron engaged portion 51f in the base member 51 so as to be engageable. The chevron-shaped pitch of each chevron engaging portion 52e and each chevron engaged portion 51f is formed to be substantially the same as the movement pitch of the inner sheet 52 (pitch in the front-rear direction of the regulation pillar 54a1) in the slide lock mechanism 540. When not seated, each chevron engaging portion 52e and each chevron engaged portion 51f are engaged and in contact with each other, but when the inner sheet 52 is moved, each chevron engaging portion 52e is easily engaged with each chevron. It is possible to move over the portion 51f. Here, since the movement pitch of the inner sheet 52 in the front-rear direction (that is, the pitch at which the regulation columns 54a1 are lined up) and the pitch of each chevron engaging portion 52e and each chevron engaged portion 51f are substantially the same, the inner sheet 52 is , The position where each chevron engaging portion 52e and each chevron engaged portion 51f are engaged can be reliably positioned as a lockable position (a position where the locking portion 54c1 of the slide lever 54 engages with the regulation pillar 54a1). it can. On the other hand, when seated, each chevron engaging portion 52e and each chevron engaged portion 51f press and engage with each other when the inner seat 52 receives a downward load due to seating, so that the inner seat 52 moves in the front-rear direction. Is regulated.

図４に示すように、インナシート５２の下面には、複数の突起部５２ｆ（係合部）が形成される。突起部５２ｆは、変形部５２ｂの梁状部５２ｂ３の下面から下方に突出して形成される。ここで、インナシート５２は、図８に示すように、非着座時において、ベース部材５１の坐骨保持部５１ｂの上面部５１０ａと、坐骨保持部５１ｂに対応する変形部５２ｂの下面と、の間には空間が形成され、基本スライド面５１ｃに対応するインナシート５２の下面は、基本スライド面５１ｃと摺接する（図７参照）。なお、ベース部材本体５１ａの縁部上面は、インナシート５２の下面と近接又は摺接する。そして、着座すると、インナシート５２の変形部５２ｂは、着座時の下方向荷重を受けて下方に沈み込む。すると、突起部５２ｆは、何れかの横壁部５１２（被係合部）と当接可能な状態となる。従って、インナシート５２の前後方向への移動が規制される。なお、ベース部材５１の上面部５１０には、適宜、突起部５２ｆとの干渉を防止するための切欠き５１２ａ（図２参照）が形成される。ベース部材５１の上面部５１０の前方側に形成される切欠き５１２ａは、インナシート５２の前方へのスライド時の干渉防止のためのものであり、後側の切欠き５１２ａは、変形部５２ｂの変形時の干渉防止のためのものである。 As shown in FIG. 4, a plurality of protrusions 52f (engagement portions) are formed on the lower surface of the inner sheet 52. The protruding portion 52f is formed so as to project downward from the lower surface of the beam-shaped portion 52b3 of the deformed portion 52b. Here, as shown in FIG. 8, the inner sheet 52 is between the upper surface portion 510a of the sciatica holding portion 51b of the base member 51 and the lower surface of the deformed portion 52b corresponding to the sciatica holding portion 51b when not seated. A space is formed in the inner sheet 52, and the lower surface of the inner sheet 52 corresponding to the basic slide surface 51c is in sliding contact with the basic slide surface 51c (see FIG. 7). The upper surface of the edge portion of the base member main body 51a is in close contact with or in sliding contact with the lower surface of the inner sheet 52. Then, when seated, the deformed portion 52b of the inner seat 52 receives a downward load at the time of sitting and sinks downward. Then, the protrusion 52f is in a state where it can come into contact with any of the side wall portions 512 (engaged portions). Therefore, the movement of the inner seat 52 in the front-rear direction is restricted. The upper surface portion 510 of the base member 51 is appropriately formed with a notch 512a (see FIG. 2) for preventing interference with the protrusion portion 52f. The notch 512a formed on the front side of the upper surface portion 510 of the base member 51 is for preventing interference when the inner sheet 52 slides forward, and the notch 512a on the rear side is the deformed portion 52b. This is to prevent interference during deformation.

また、インナシート５２の前方下面には、左右２か所にそれぞれ前進規制突起５２ｇが設けられる。前進規制突起５２ｇは、左右それぞれ２個ずつ配置される。各２個の前進規制突起５２ｇは、Ｕ字状の切り抜き部５２ｇ１により弾性力を備える板バネ部５２ｇ２に形成される。板バネ部５２ｇ２は、インナシート５２をベース部材５１に取り付ける際に、後方に押し込むと前進規制突起５２ｇの傾斜部分により持ち上げられて弾発する。図９に示すように、前進規制突起５２ｇは、インナシート５２の前進限にてベース部材５１の前壁５１５と当接し、インナシート５２の前進移動が規制される。なお、インナシート５２の後退限は、第１スライド部５２ｃ及び第２スライド部５２ｄのスリット５２ｃ２，５２ｄ２における閉塞された前端に第１ガイド部５１ｄ、第２ガイド部５１ｅの基板５１ｄ２，５１ｅ２が当接して設定される。 Further, on the front lower surface of the inner sheet 52, forward regulation protrusions 52g are provided at two places on the left and right, respectively. Two forward restricting protrusions 52g are arranged on each of the left and right sides. Each of the two forward regulation protrusions 52g is formed in a leaf spring portion 52g2 having an elastic force by a U-shaped cutout portion 52g1. When the leaf spring portion 52g2 is attached to the base member 51, the leaf spring portion 52g2 is lifted and repelled by the inclined portion of the forward regulation protrusion 52g when pushed backward. As shown in FIG. 9, the forward restricting projection 52g comes into contact with the front wall 515 of the base member 51 at the forward limit of the inner sheet 52, and the forward movement of the inner sheet 52 is restricted. As for the retreat limit of the inner sheet 52, the first guide portion 51d and the substrates 51d2 and 51e2 of the second guide portion 51e are applied to the closed front ends of the slits 52c2 and 52d2 of the first slide portion 52c and the second slide portion 52d. It is set in contact.

インナシート５２の変形部５２ｂの前方側には、前後方向に長いリブ５２ｈが形成されている。リブ５２ｈにより、変形部５２ｂの前方の剛性が高められている。 A rib 52h long in the front-rear direction is formed on the front side of the deformed portion 52b of the inner sheet 52. The rib 52h enhances the rigidity in front of the deformed portion 52b.

このように形成される椅子１では、スライドレバー５４を上方に持ち上げるようにして回動させることにより、アウタシート５３及びインナシート５２を前後にスライドさせて、体格に合わせて座面５３ａの位置を調節することができる。アウタシート５３の座面５３ａに着座すると、インナシート５２の変形部５２ｂは坐骨保持部５１ｂの形状に倣って変形し、アウタシート５３の座面５３ａは変形部５２ｂの変形に倣って変形する。 In the chair 1 formed in this way, the outer seat 53 and the inner seat 52 are slid back and forth by rotating the slide lever 54 so as to lift it upward, and the position of the seat surface 53a is adjusted according to the physique. can do. When seated on the seating surface 53a of the outer seat 53, the deformed portion 52b of the inner seat 52 is deformed according to the shape of the ischial bone holding portion 51b, and the seating surface 53a of the outer seat 53 is deformed following the deformation of the deformed portion 52b.

以上、本発明の実施形態を説明したが、本発明は本実施形態に限定されることは無く、種々変更を加えて実施することができる。 Although the embodiment of the present invention has been described above, the present invention is not limited to the present embodiment and can be implemented with various modifications.

１椅子１０脚部
１１脚杆１２キャスター
１３支柱３０ロッキング機構
３１ロッキング切替レバー３２昇降レバー
４０背凭れ４１背アーム
５０座５１ベース部材
５１ａベース部材本体５１ｂ坐骨保持部
５１ｃ基本スライド面５１ｄ第１ガイド部
５１ｄ１頭部５１ｄ２基板
５１ｅ第２ガイド部５１ｅ１頭部
５１ｅ２基板５１ｅ３受け部
５１ｆ山形被係合部（被係合部）
５２インナシート５２ａノッチ
５２ｂ変形部５２ｂ１孔部
５２ｂ２孔部５２ｂ３梁状部
５２ｃ第１スライド部５２ｃ１通し孔
５２ｃ２スリット５２ｄ第２スライド部
５２ｄ１通し孔５２ｄ２スリット
５２ｅ山形係合部（係合部）５２ｆ突起部（係合部）
５２ｇ前進規制突起５２ｇ１切り抜き部
５２ｇ２板バネ部５２ｈリブ
５３アウタシート５３ａ座面
５４スライドレバー５４ａ位置決め部
５４ａ１規制柱５４ｂ操作板部
５４ｃ係合板部５４ｃ１ロック部
５４ｄ回動軸
５１０，５１０ａ，５１０ｂ上面部
５１１縦壁部５１２横壁部（被係合部）
５１２ａ切欠き５１５前壁
５２０上面部５４０スライドロック機構
ＤＰ最深部ＦＨ高さ
ＲＨ高さＳ所定距離 1 Chair 10 Legs 11 Legs 12 Caster 13 Struts 30 Locking mechanism 31 Locking switching lever 32 Lifting lever 40 Backrest 41 Back arm 50 Seat 51 Base member 51a Base member body 51b Sitbone holding section 51c Basic slide surface 51d First guide section 51d1 Head 51d2 Board 51e Second guide part 51e1 Head 51e2 Board 51e3 Receiving part 51f Yamagata engaged part (engaged part)
52 Inner sheet 52a Notch 52b Deformation part 52b1 Hole part 52b2 Hole part 52b3 Beam-like part 52c First slide part 52c1 Through hole 52c2 Slit 52d Second slide part 52d1 Through hole 52d2 Slit 52e Yamagata engaging part (engagement part) 52f Part (engagement part)
52g Forward regulation protrusion 52g1 Cutout part 52g2 Leaf spring part 52h Rib 53 Outer seat 53a Seat surface 54 Slide lever 54a Positioning part 54a1 Regulation pillar 54b Operation plate part 54c Engagement plate part 54c1 Lock part 54d Rotating shaft 510, 510a, 510b Top surface part 511 Vertical wall part 512 Horizontal wall part (engaged part)
512a Notch 515 Front wall 520 Top surface 540 Slide lock mechanism DP Deepest FH Height RH Height S Predetermined distance

Claims

A base member having an engaged part and
An inner sheet provided on the base member so as to be movable back and forth and having an engaging portion formed so as to be engageable with the engaged portion.
An outer sheet provided on the inner sheet and having a seating surface formed on the upper surface,
Have,
The engaged portion and the engaging portion regulate the back-and-forth movement of the inner seat by a downward load on the inner seat due to seating on the seat surface.
A chair that features that.

The engaged portion has a mountain-shaped engaged portion having a side view mountain shape that is continuous in the front-rear direction.
The chair according to claim 1, wherein the engaging portion has a chevron engaging portion formed in the same shape as the chevron engaged portion.

It is equipped with a slide lock mechanism that can lock the inner seat by moving it back and forth at equal pitches.
The chair according to claim 2, wherein the chevron engaged portion and the chevron engaging portion are formed at the same pitch as the movement pitch of the slide lock mechanism.

The engaged portion has a lateral wall portion extending in the left-right direction in a concave sciatica holding portion formed behind the upper surface portion of the base member.
The chair according to any one of claims 1 to 3, wherein the engaging portion has a plurality of protrusions protruding downward from the lower surface of the deformable portion that can be deformed in accordance with the ischial holding portion.

The chair according to any one of claims 1 to 4, wherein the upper surface portion of the base member includes a portion that tilts forward on the anterior side of the ischial bone holding portion.