JP7600558B2 - chair - Google Patents

Description

The present invention relates to a chair suitable for use in offices, etc.

Chairs with seats that are supported so as to be rotatable between a seated position relative to a support and a standing position relative to the floor are known (see, for example, Patent Document 1).

Conventional seats have relatively thin cushioning overall to improve storage efficiency and reduce weight when stacked in the front-to-rear direction. For example, the seat of the chair disclosed in Patent Document 1 has a relatively thin cushion that is provided almost uniformly in the front-to-rear direction, so it is difficult to say that it provides sufficient cushioning for the seated person.

JP 2009-106422 A

The present invention was made with the above in mind, and aims to provide a chair that can rotate between a seatable position and a standing position in which the seat is raised above the floor, and that provides optimal cushioning for the seated person.

That is, the present invention has the following configuration.

The invention described in claim 1 is a chair having a seat that is supported so as to be rotatable between a usable position in which the seat can be sat on relative to a support and an upright position in which the seat is upright relative to a floor surface, the seat comprising a seat body having a shell body having a downwardly bulging shape, a cushion supported by the shell body, and upholstery covering the outer surface of the cushion, and a seat frame formed of synthetic resin and having a frame portion capable of supporting the peripheral portion of the seat body, the seat frame comprising a cross-frame portion suspended on the frame portion, the shell body being attached to the cross-frame portion, the frame portion comprising left and right side frame portions extending in the fore-and-aft direction, a front frame portion connecting the front ends of the left and right side frame portions, and a rear frame portion connecting the rear ends of the left and right side frame portions, the cross-frame portion being suspended between the fore-and-aft middle portions of the left and right side frame portions .

The invention described in claim 2 is the chair described in claim 1, wherein the shell body is attached to an upper surface of the horizontal frame portion.

The invention described in claim 3 is a chair as described in claim 1 or 2, wherein the support body comprises a pair of left and right leg constituent members and a joint material interposed between the left and right leg constituent members and connecting the left and right leg constituent members, and in the usage position, the weight of a seated person can be transmitted to the joint material via the shell body and the cross frame portion.

The invention described in claim 4 is a chair as described in claim 1, 2 or 3, wherein the support body comprises a pair of left and right leg constituent members and a joint material interposed between the left and right leg constituent members and connecting the left and right leg constituent members, and in the usage position, the weight of a seated person can be transmitted to the joint material via the shell body and the cross frame portion.

The invention described in claim 5 is a chair described in claims 1, 2, 3 or 4, in which an axis insertion hole penetrating in the left-right direction is provided in the frame portion, and the frame portion is rotatably supported relative to an axis member inserted into the axis insertion hole and attached to the support body.

As described above, the present invention provides a chair in which the seat can be rotated between a usable position where the seat can be sat on and a standing position where the seat is raised above the floor, and which provides optimal cushioning for the seated person.

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. FIG. FIG. FIG. FIG. FIG. FIG. FIG. 4 is a right side view showing a stacked state in the embodiment. 3 is a cross-sectional view taken along line XX in FIG. 2. FIG. FIG. FIG. FIG. FIG. FIG. FIG. FIG. 4 is an enlarged view illustrating a hole in the embodiment. Cross-sectional view taken along line YY in FIG. 17. FIG. FIG. Cross-sectional view taken along line Z-Z in Figure 21.

The following describes an embodiment of the chair.

The embodiment shown in Figures 1 to 15 is a chair that can be stacked in the front-to-rear direction on the floor with other chairs of the same structure. The chair has a support A with leg components 1 formed by aluminum die casting, a cushion-type seat B1 rotatably supported on the support A, a back panel C supported on the support A, and an optional memo pad D supported on the support A.

The individual components of the chair are described in detail below.

<<Support A>>
The support body A comprises left and right leg constituent members 1 which are paired on the left and right and formed by injection molding, i.e., aluminum die casting, and a joint material 2 which is formed from a separate member from the left and right leg constituent members 1 and is interposed between the left and right leg constituent members 1 to connect them together.

<Leg constituent member 1>
The left and right leg constituent members 1 are substantially symmetrical in shape. The left and right leg constituent members 1 are each integrally formed by die-casting aluminum. The left and right leg constituent members 1 each include a rear leg 11, a front leg 12 integrally extending forward from an upper end of the rear leg 11, and a joint portion 13 extending from a longitudinal intermediate portion of the front leg 12, the tip of which is connected to a side end portion of the joint material 2.

Casters 14 are provided at the bottom ends of the rear legs 11 and the front legs 12. The inner surfaces of the left and right rear legs 11 are provided with rear dampers F made of synthetic resin that function to cushion other chairs entering from the rear when stacking, and to position the chairs relative to other chairs.

The rear legs 11 extend in the vertical direction. When viewed from the side, the rear legs 11 extend in the vertical direction in a forward-leaning position. When viewed from the front and rear, the rear legs 11 are inclined so that the lower part is positioned outward relative to the upper part.

The upper end of the rear leg 11 is provided with a back panel connection part 11a that protrudes upward. The back panel connection part 11a is shaped to fit into a fitting hole (not shown) that is formed downward in the extension part c2 of the back panel C. The extension part c2 of the back panel C fits externally into the back panel connection part 11a provided on the leg component 1. The extension part c2 of the back panel C and the back panel connection part 11a are fixed together by a screw v1.

The front legs 12 are equipped with inclined front leg sections 12a that extend linearly in a backward tilted position in side view, and upper front leg sections 12b that extend in the front-to-rear direction and connect the upper end of the inclined front leg section 12a to the upper end of the rear leg 11. In the front legs 12, the inclined front leg section 12a is located at the front, and the upper front leg section 12b is located at the rear.

The front legs 12 are inclined so that their lower parts are positioned more inward than their upper parts when viewed from the front and rear. The width of the inclined front leg parts 12a when viewed from the side is set to be shorter than the width of the upper front leg parts 12b when viewed from the side.

The front leg 12 has a holding part 12c on the inner side of the upper front leg part 12b located at the top of the front leg 12, which can rotatably support the seat B1. The holding part 12c has a bottomed hole shape that opens inward. A shaft member P for pivotally supporting the seat B1 can be attached to the holding part 12c.

The joint portion 13 protrudes forward and inward from the longitudinal middle portion of the front leg 12. The joint portion 13 protrudes from the longitudinal middle portion of the front leg 12, more specifically, from the inner surface side of the upper portion of the inclined front leg portion 12a of the front leg 12. The joint portion 13 extends forward approximately horizontally from the inclined front leg portion 12a in a side view. The joint portion 13 extends inward approximately horizontally in a front view.

The joint part 13 extends diagonally forward when viewed from the bottom. The joint part 13 has a screw insertion hole h2 penetrating in the left-right direction at its tip part 13b. The tip part 13b of the joint part 13 has a shape that can be fitted into the joint material 2. The tip part 13b of the joint part 13 is fitted into a recessed part 21 provided at the end of the joint material 2. The leg component 1 having the joint part 13 is connected to the joint material 2 using a screw v2 inserted into the screw insertion hole h1 of the tip part 13b of the joint part 13.

The screw v2 that connects the joint material 2 to the leg component 1 is concealed by a cover G that is roughly L-shaped in plan view and also serves as a buffer against other chairs.

The rear dampers F are attached to the inner surfaces of the left and right rear legs 11 that make up the leg component 1.

<Joint material 2>
The joint material 2 has a rectangular column shape extending in the left-right direction. The joint material 2 can function as a seat support that can support the seat B1 from below. The joint material 2 has a substantially rectangular column shape extending in the left-right direction. The joint material 2 has an upward surface 22 that is substantially horizontal and a downward surface 23 that is substantially horizontal.

The upper surface 22 of the joint material 2 is adapted to come into contact with the lower surface of the horizontal frame portion 7 of the seat B1 in the usage position (S) via the cushioning member 73. The joint material 2 is provided with a nut portion h2 into which a screw v2 inserted from the outside can be screwed at both left and right ends. The joint material 2 is attached to the joint portion 13 provided on the leg component 1 by the screw v2.

A memo pad D is attached to the joint material 2. The base end arm component 91 of the arm 9 is rigidly connected to the downward surface 23 of the joint material 2 by welding.

<< Seat B1 (cushion type seat B1) >>
The seat B1 is supported so as to be rotatable between a usage position (S) in which the seat can be seated on the support A and a standing position (U) in which the seat B1 stands up against the floor surface. The seat B1 is configured so that its position can be changed between the usage position (S) in which the seat surface m1 faces upwards and the seat can be seated on, and the standing position (U) in which the seat B1 stands up against the floor surface and can be stacked in the front-rear direction. The seat B1 is supported so as to be rotatable on the upper front leg 12b of the front leg 12 of the support A via the shaft member P.

Seat B1 is equipped with a cushion-type seat body J, which is made up of a cushion 4 placed on top of a shell body 3 that bulges downward, and a seat frame K that can support the seat body J. In the use position (S), seat B1 is designed so that the weight of the seated person can be transmitted to the joint material 2 via the upholstery 5, cushion 4, shell body 3, and cross-frame portion 7.

<Seat body J>
The seat body J is supported by the support A via a seat frame K. The seat body J includes a shell body 3 having a downwardly bulging shape, a cushion 4 supported by the shell body 3, and an upholstery 5 covering the outer surface of the cushion 4.

The shell body 3 comprises a shell body main body 31 which constitutes the main part, and a frame attachment part 32 which protrudes downward from the underside of the shell body main body 31. The shell body main body 31 and the frame attachment part 32 which constitute the shell body 3 are integrally formed from synthetic resin.

The shell body main body 31 has a generally rectangular shape in a plan view. The shell body main body 31 has a container shape with an open upper side. In other words, the shell body main body 31 has a shape with an open upper side and a concave shape toward the lower side. The shell body main body 31 has a cushion storage space sp that can store the cushion 4 based on the concave shape toward the lower side.

As shown in FIG. 10, the central portion of the shell body main body 31 in the left-right direction has a generally S-shaped cross section. In other words, the shell body main body 31 has a front portion 31a that is concave upward, and a rear portion 31b that bulges downward, with the frame attachment portion 32 as the boundary.

That is, the seat frame K has a front annular portion K1 formed by the left and right side frame portions 61, the front frame portion 62, and the cross frame portion 7, and a rear annular portion K2 formed by the left and right side frame portions 61, the rear frame portion 63, and the cross frame portion 7.

The portion surrounded by the front annular portion K1 of the shell body main body 31 constituting the shell body 3, i.e., the front portion 31a, has an upwardly concave shape, and the portion surrounded by the rear annular portion K2 of the shell body main body 31 constituting the shell body 3, i.e., the rear portion 31b, has a downwardly bulging shape.

The shell body 3 is attached to the horizontal frame portion 7 of the seat frame K. More specifically, a frame attachment portion 32 protrudes downward from the center in the front-to-rear direction of the underside of the shell body main body 31. The frame attachment portion 32 is configured to be constantly attached to the upper surface of the horizontal frame portion 7 of the seat frame K.

The rear of the shell body 3 is provided with a claw engagement portion ka with which the claw portion tm provided on the seat frame K can engage.

The frame attachment portion 32 is provided with a front horizontal rib 32a that forms an upright wall extending in the left-right direction, a rear horizontal rib 32b that forms an upright wall extending in the left-right direction and is arranged approximately parallel to the front horizontal rib 32a at a distance, and a vertical rib 32c that forms an upright wall extending in the front-rear direction and is arranged at three locations on the left, right, and center to connect the front horizontal rib 32a and the rear horizontal rib 32b.

The cushion 4 is made of a known material such as urethane foam and has a certain degree of elastic repulsion. The lower part of the cushion 4 has a shape that corresponds to the concave shape of the shell body main body 31. In other words, the lower part of the cushion 4 is shaped to fill the cushion storage space sp provided in the shell body main body 31.

The thickness dimension w2 of the rear portion 42 of the cushion 4 supported by the rear portion 31b of the shell body main body 31 is set to be longer than the thickness dimension w1 of the front portion 41 of the cushion 4 supported by the front portion 31a of the shell body main body 31. Therefore, the rear portion 42 of the cushion 4, which can mainly support the buttocks of a seated person, is provided with suitable cushioning properties.

The upholstery 5 is mainly made of fabric and covers the upper surface and peripheral portion of the cushion 4 as well as the peripheral portion 3e of the shell body 3. The edge 5e of the upholstery 5 is held between the lower surface of the peripheral portion 3e of the shell body 3 and the upper surface of the frame portion 6 of the seat frame K by an appropriate method.

<Seat frame K>
The seat frame K has a frame portion 6 formed of synthetic resin and capable of supporting the peripheral portion of the seat body J. The seat frame K is rotatably supported by the support A via an axis member P. The seat frame K, which is pivotally supported by the seat B1, is capable of supporting the seat body J from below. The seat frame K is arranged so as to be visible from the outside. In other words, the seat frame K is exposed to the outside.

The seat frame K comprises a frame section 6 that is attached to the underside of the peripheral portion of the seat body J, and a cross-frame section 7 that is suspended from the frame section 6. The seat frame K is made by integrally forming the frame section 6 and the cross-frame section 7 from synthetic resin.

The frame section 6 includes left and right side frame portions 61, a front frame portion 62 connecting the front ends of the left and right side frame portions 61, and a rear frame portion 63 connecting the rear ends of the left and right side frame portions 61.

The left and right side frame parts 61 are provided with shaft insertion holes 61a through which shaft members P for rotatably supporting the seat B1 can be inserted. A flange portion p1 is formed on the inner end of the shaft member P. The flange portion p1 of the shaft member P is adapted to be attached to the inner surface side of the side frame parts 61. The frame parts 6 are made of, for example, reinforced nylon and have high rigidity, and work together with the shaft members P attached directly to the left and right leg components 1 to prevent the left and right leg components 1 from separating from each other.

The horizontal frame section 7 has a curved shape that is convex downward when viewed from the front. The horizontal frame section 7 is installed between the left and right side frame parts 61 of the frame section 6. The horizontal frame section 7 has inclined extension parts 71 that protrude diagonally downward from the inner surfaces of the left and right side frame parts 61, and a horizontal horizontal section 72 that extends approximately horizontally in the left-right direction between the tips of the left and right inclined extension parts 71. A rectangular plate-shaped buffer member 73 is provided on the underside of the horizontal horizontal section 72, and the buffer member 73 is adapted to come into contact with the joint material 2.

<<Back Panel C>>
The back panel C comprises a back panel main body c1 having a backrest surface that can be brought into contact with the back of a seated person, and left and right extension portions c2 that extend downward from the left and right lower end portions of the back panel main body c1.

The back plate C is designed so that fitting holes (not shown) provided on the left and right extensions c2 fit onto the back plate connection parts 11a provided on the support body A. The left and right extensions c2 are provided with screw insertion holes h1. The back plate C is attached to the support body A by screwing a screw v1 inserted through the screw insertion hole h1 into a nut n1 provided on the back plate connection parts 11a.

<<Memo stand D>>
The optional memo stand D comprises a top plate 8 which is the optional main body, an arm 9 which supports the top plate 8, and a top plate support mechanism L which is interposed between the top plate 8 and the arm 9 and can support the top plate 8 so that its position can be changed.

The top plate 8 is a generally rectangular plate. The top plate 8 can change its position relative to the arm 9 between a generally horizontal use position (M) and a retracted position (T) retracted from the use position (M). In other words, the top plate 8 is configured to be able to change its position by the top plate support mechanism L between the use position (M) in which various items can be placed on the top surface and the retracted position (T) in which it hangs down vertically.

The arm 9 is made of a metal pipe material. The arm 9 includes a base end arm component 91 that is a base end extending in a substantially straight line in the left-right direction, an intermediate arm component 93 that is a straight portion that is connected to the left end of the base end arm component 91 via a lower bent portion 92 that is a bent portion, is located below the joint portion 13, and extends along the longitudinal direction of the joint portion 13, a main arm component 95 that is connected to the left end of the intermediate arm component 93 via a rear bent portion 94 that is a bent portion, and extends diagonally upward and forward from the base end to the tip, and a front arm component 97 that is connected to the front end of the main arm component 95 via a front bent portion 96 that is a bent portion and extends forward in a straight line.

The base-end arm component 91 is integrally connected to the joint material 2. In other words, the base-end arm component 91 is disposed along the longitudinal direction of the joint material 2 and is fixed to the lower surface side, i.e., the downward surface 23, of the joint material 2 by welding.

The top plate 8 of the memo stand D is disposed to the left of the joint material 2 of the support body A. On the other hand, the terminal portion 91e of the base end arm component 91 constituting the arm 9 of the memo stand D is disposed to the right of the center of the joint material 2 in the left-right direction.

The intermediate arm component 93 is set to be located below the left joint portion 13. The intermediate arm component 93 is disposed along the longitudinal direction of the joint portion 13. The intermediate arm component 93 and the joint portion 13 are interconnected via a bracket br. The intermediate arm component 93 is located along the lower side of the joint portion 13, so that it does not spoil the appearance.

In this embodiment, the bracket br is fixed to the intermediate arm component 93 in advance by welding. The intermediate arm component 93 is stably supported by the joint portion 13 by screwing a screw v3 inserted through the screw insertion hole h3 of the bracket br into a nut (not shown) provided on the joint portion 13.

The tabletop support mechanism L is of a known configuration, comprising a first rotation support part L1 that is rotatably mounted on the front-end arm component 97 around the axis of the tip of the arm 9, i.e., the axis of the front-end arm component 97, and a second rotation support part L2 that is rotatably mounted relative to the first rotation support part L1 and has an attachment plate L21 that is screwed to the underside of the tabletop 8.

As shown in Figure 9, a chair equipped with a seat B1 and a memo stand D is configured so that it can be nested in the front-to-rear direction with another chair of the same structure when the seat B1 is held in an upright position (U) and the top plate 8 of the memo stand D is held in a retracted position (T).

<<Configuration that allows flexible manufacturing of two types of seats B1 and B2>>
13 to 15, the chair shown in this embodiment is designed to manufacture a seat (seat B1 or seat B2) by attaching one seat body (either seat body J or seat body E) selected from two types of seat bodies J and E having different structures to a seat frame K having a frame portion 6 as a frame-shaped portion. The two types of seat bodies J and E are configured to be detachable from the seat frame K using screws v4 as fasteners.

Two types of seat bodies J and E are shown in Figure 13. The seat body J shown in Figures 13 and 14 is a cushion type in which upholstery 5 is stretched over the top surface of the cushion 4, and the top surface of the upholstery 5 serves as the seating surface m1. The seat body E shown in Figures 13 and 15 is a seat board type in which the top surface of a plate-like body serves as the seating surface m2.

The two types of seat bodies J and E are each configured to be detachable from the seat frame K in a state where it is pivotally supported on the support body A. That is, by screwing a screw v4 inserted into a screw insertion hole h4 provided in the frame portion 6 of the seat frame K into a nut n4 provided on the seat body J or E, it is possible to attach one of the two types of seat bodies J or E to the seat frame K in a state where it is attached to the support body A.

The cushion-type seat body J cannot form a seat B1 pivoted to the support body A unless it is attached to the seat frame K which is rotatably supported on the support body A via the shaft member P. In other words, when the seat body J is attached to the seat frame K, the rear portion 31b of the shell body body 31 in the shell body 3 is positioned at a position which prevents the shaft member P connecting the support body A and the seat frame K from being inserted or removed.

In addition, even if one were to attach the cushion-type seat body J to the seat frame K to form the seat B1 and then attempt to attach the seat B1 to the support body A, the shell body 3 constituting the seat body J would get in the way and prevent the shaft member P from being inserted through the seat frame K and the support body A, making it impossible to attach the seat B1 to the support body A.

<< Seat type B2 >>
16, the chair is configured so that a seat plate type seat B2 comprising a seat frame K and a seat plate type seat body E can be constructed by mounting a seat plate type seat body E to a seat frame K pivotally supported on a support A. The seat plate type seat B2, like the cushion type seat B1, is configured to be rotatable between a usage position (S) in which the user can sit on the support A and a standing position (U) in which the user stands upright on the floor surface.

The seat plate type seat body (hereinafter referred to as "seat plate E") has a seat plate body E1 that is roughly rectangular in plan view and has multiple holes N that penetrate in the vertical direction, and a peripheral portion E2 that is provided on the outer periphery of the seat plate body E1.

The seat plate body E1 constituting the seat plate E has a number of holes N, and the hole N provided in the central region R in the front-rear and left-right directions is formed to be the largest among the number of holes N provided in the seat plate body E1. The size of the number of holes N provided in the seat plate body E1 is formed to gradually decrease from the central region R outward, that is, toward the peripheral edge portion E2 surrounding the outer periphery of the seat plate body E1.

In other words, outward from the central region R includes the front, rear, both left and right sides, diagonally forward, and diagonally rearward from the central region R.

The thickness dimension of the seat plate body E is set to be approximately uniform overall. Therefore, the volume of the hole N is set to gradually decrease from the central region R toward the outside.

Of the multiple holes N drilled in the vertical direction in the seat plate body E1, the holes N provided in the area near the peripheral edge E2 are formed to be the smallest. The seat plate body E1 is formed so that the holes N gradually become smaller and disappear in the process from the central region R to the peripheral edge E2.

Around a particular hole N, six other holes N are arranged at approximately equal distances so as to surround it.

As shown in the enlarged view of FIG. 18, the opening edges Ne that form the multiple holes N are substantially symmetrical with respect to the center point ct in the front-rear and left-right directions in a plan view. In other words, the opening edges Ne that form the multiple holes N are point-symmetrical with respect to the virtual center point ct.

The opening edges Ne of the multiple holes N are shaped in a plan view with no sharp corners of 90° or less. More specifically, as shown in FIG. 18, the opening edges Ne are shaped in a plan view with four sides of a square indicated by a two-dot chain line curved outwardly.

The seat panel E has a peripheral portion E2, which is an area that does not have holes on the outer periphery of the seat panel main body E1. The underside of the peripheral portion E2 is supported by the frame that constitutes the chair, i.e., the frame portion 6 of the seat frame K supported by the support body A. In other words, the frame portion 6, which is the frame that constitutes the chair, constitutes the seat panel E, which is composed of the seat panel main body E1 and the peripheral portion E2, together with the seat panel E, which is composed of the seat panel main body E1 and the peripheral portion E2, to form the seat panel type seat B2.

The frame that can support the peripheral portion of the seat plate is not limited to the one that constitutes the seat as shown in FIG. 16, but may be, for example, the one shown in FIG. 20.

The chair shown in Figure 20 has a seat plate H and a back plate Q supported by a support frame I. The frame constituting the chair in this figure refers to the support frame I, which includes the base frame portion i1, which is a leg frame, the front leg frame portion i2, and the rear leg frame portion i3, and is made of metal pipe material and metal plate material.

The specific configuration of seat plate H is the same as that of the seat plate type seat body (seat plate E), except for the specific structure for supporting it on the support frame I, so it will be described using the same reference numerals and detailed description will be omitted.

The support frame I that supports the seat plate H is made up of a pair of base frame sections i1 that extend in the front-rear direction roughly parallel to the floor surface, a front leg frame section i2 that stands upright on the front end of the base frame section i1, a rear leg frame section i3 that stands upright on the rear end of the base frame section i1, a side seat support frame section i4 that is installed between the upper end of the front leg frame section i2 and the upper end of the rear leg frame section i3, a front cross frame section i5 that connects the front ends of the side seat support frame sections i4, a rear cross frame section i6 that connects the rear ends of the side seat support frame sections i4, and a back support frame section (not shown) that extends upward from the upper end of the rear leg frame section i3 and the rear end of the side seat support frame section i4.

The rear leg frame section i3, base frame section i4, front leg frame section i2, side seat support frame section i4, and back support frame section are formed continuously from a single metal pipe.

The front cross-frame section i5 and the rear cross-frame section i6 are formed from metal plates.

The front cross-frame section i5 and rear cross-frame section i6 are made of metal plates, and the left and right side seat support frame sections i4 are made of metal pipe material, forming a rectangular seat support frame IW capable of supporting the peripheral portion E of the seat plate H.

As explained above, the chair according to this embodiment has a seat B1 supported so as to be rotatable between a seatable position (S) on the support A and a standing position (U) in which the seat B1 stands upright on the floor. The seat B1 is equipped with a shell body 3 having a downwardly bulging shape, a seat body J having a cushion 4 supported by the shell body 3, and an upholstery 5 covering the outer surface of the cushion 4, and a seat frame K having a frame portion 6 formed of synthetic resin and capable of supporting the peripheral portion 3e of the seat body J.

This allows the seat B1 to rotate between a seatable position (S) and a standing position (U) in which it stands upright against the floor, and also provides a chair that provides optimal cushioning for the seated person.

In other words, seat B1 has a cushion 4 supported on a shell body 3 that bulges downward. This makes it easy to set the volume of the cushion 4 as large as possible, and provides excellent design freedom to optimally provide cushioning for the seated occupant. In other words, seat B1 contributes to improving the seating comfort for the seated occupant by allowing the cushion 4 to function optimally.

The seat frame K includes a horizontal frame portion 7 that is suspended from the frame portion 6. The shell body 3 is then attached to the horizontal frame portion 7.

As a result, the shell body 3 housing the cushion 4 can be suitably supported by the horizontal frame portion 7 of the seat frame K.

In addition, because the underside of the shell body 3 is supported by the horizontal frame portion 7, there is space in front of and behind the horizontal frame portion 7 for the shell body 3 to bulge downward. With this configuration, the horizontal frame portion 7 is not only able to support the shell body 3, but also increases the design freedom so that the shell body 3 can accommodate a large amount of cushion 4.

The frame section 6 includes left and right side frame parts 61 extending in the front-to-rear direction, a front frame part 62 connecting the front ends of the left and right side frame parts 61, and a rear frame part 63 connecting the rear ends of the left and right side frame parts 61. The cross frame part 7 is installed between the middle parts of the left and right side frame parts 61 in the front-to-rear direction.

For this reason, the horizontal frame portion 7 is provided in a suitable position to support the shell body 3. In addition, the horizontal frame portion 7 is located in the middle of the frame portion K in the front-to-rear direction, which contributes to the freedom of design so that the shell body 3 can accommodate as many cushions 4 as possible.

The left and right side frame portions 61, the front frame portion 62, and the cross frame portion 7 form a continuous annular front annular portion K1, and the left and right side frame portions 61, the rear frame portion 63, and the cross frame portion 7 form a continuous annular rear annular portion K2.

The front portion 31a, which is the portion of the shell body 3 surrounded by the front annular portion K1, has an upwardly concave shape, and the rear portion 31b, which is the portion of the shell body 3 surrounded by the rear annular portion K2, has a downwardly bulging shape.

For this reason, the shell body 3 has a suitable shape that can provide suitable cushioning for the seated person. In other words, the rear part 42 of the cushion 4 is located in the rear part 31b surrounded by the rear annular part K2 of the shell body 3, and the cushion 4 is arranged thickly. Therefore, it is possible to provide suitable cushioning for the buttocks of the seated person.

In addition, the structure in which the shell body 3 is supported by the seat frame K allows for a reduction in the amount of material used for the seat B1 and makes it lighter.

The support A is provided with a pair of left and right leg components 1, and a joint material 2 that is interposed between the left and right leg components 1 and connects the left and right leg components 1 to each other. In the use position (S), the weight of a seated person can be transmitted to the joint material 2 via the shell body 3 and the cross-frame portion 7.

For this reason, the seat B1 has a suitable configuration that can transmit the weight of the seated person to the support A.

The frame portion 6 is provided with an axis insertion hole 61a that penetrates in the left-right direction, and the frame portion 6 is supported rotatably with respect to an axis member P that is inserted into the axis insertion hole 61a and attached to the support body A.

Therefore, by attaching the seat body J to the seat frame K, the entire seat B1 is supported rotatably relative to the support body A.

The present invention is not limited to the embodiments described above.

The shell body may take any suitable shape without departing from the spirit of the present invention.

For example, both the portion of the shell body surrounded by the front annular portion and the portion of the shell body surrounded by the rear annular portion may be shaped to bulge downward.

The shell body may also be configured so that the portion surrounded by the front annular portion and the portion surrounded by the rear annular portion are elastically deformable when subjected to the load of a seated person.

The specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

A…Support B1…Seat C…Backboard D…Memo stand (optional)
J... Seat body 3... Shell body 4... Cushion 5... Upholstery

Claims (5)

A chair having a seat supported so as to be rotatable between a use position in which the seat can be sat on a support and a standing position in which the seat is raised on a floor surface,
The seat comprises a seat body having a shell body bulging downward, a cushion supported by the shell body, and an upholstery covering the outer surface of the cushion; and a seat frame having a frame portion formed of a synthetic resin and capable of supporting the peripheral portion of the seat body,
The seat frame includes a horizontal frame portion that is supported on the frame portion, and the shell body is attached to the horizontal frame portion .
the frame portion includes left and right side frame portions extending in the front-rear direction, a front frame portion connecting front ends of the left and right side frame portions, and a rear frame portion connecting rear ends of the left and right side frame portions,
The horizontal frame portion is installed between the front-to-rear middle portions of the left and right side frame portions . The chair according to claim 1, wherein the shell body is attached to the upper surface of the cross-frame portion. a front annular portion that is continuous in an annular shape is formed by the left and right side frame portions, the front frame portion, and the horizontal frame portion, and a rear annular portion that is continuous in an annular shape is formed by the left and right side frame portions, the rear frame portion, and the horizontal frame portion,
3. The chair according to claim 1 or 2, wherein a portion of the shell body surrounded by the front annular portion has an upwardly concave shape, and a portion of the shell body surrounded by the rear annular portion has a downwardly bulging shape. The support body includes a pair of left and right leg components, and a joint material interposed between the left and right leg components and connecting the left and right leg components to each other,
4. The chair according to claim 1, 2 or 3, wherein in the use position, the load of a seated person can be transmitted to the joint material via the shell body and the cross-bridge frame portion. The frame portion is provided with a shaft insertion hole penetrating in the left-right direction,
5. The chair according to claim 1, 2, 3 or 4, wherein the frame portion is rotatably supported on a shaft member that is inserted into the shaft insertion hole and attached to the support.

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