chair

Abstract

To provide a chair capable of rotating between a use posture in which a seat can be seated on and an upright position standing with respect to a floor surface and of suitably exhibiting cushion property for the sitter.SOLUTION: In a chair which has a seat B1 rotatably supported between a use posture that is sittable with respect to a support body and an upright posture standing with respect to a floor surface, the seat B1 includes: a shell body 3 in the shape bulging below; a seat body J which has a cushion 4 supported by the shell body 3 and a stretch fabric 5 covering an outer surface of the cushion 4; and a seat frame K having a frame portion 6 capable of supporting a peripheral edge part 3e of the seat body J formed by synthetic resin.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a chair that is suitable for use in an office or the like. [Background technology]

[0002] 2. Description of the Related Art Chairs having a seat supported so as to be rotatable between a use position in which the user can sit on a support and a standing position in which the seat stands upright on a floor surface are known (see, for example, Patent Document 1).

[0003] Conventional seats have relatively thin cushioning overall to accommodate weight reduction and storage efficiency when stacking in the front-to-rear direction, etc. 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-106422 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a chair in which the seat can be rotated between a usable position in which it can be sat on and a standing position in which it is raised above the floor, and which can provide optimal cushioning for the seated person. [Means for solving the problem]

[0006] That is, the present invention has the following configuration.

[0007] The invention described in claim 1 is a chair having a seat supported so as to be rotatable between a use position where the seat can be sat on a support and an upright position where the seat is upright on 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 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 by 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 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, and the cross-bridge frame portion is installed between the front-rear direction intermediate portions of the left and right side frame portions. It's a chair.

[0008] The invention described in claim 2 is characterized in that the shell body is the horizontal frame portion. On the top of The chair according to claim 1 is attached to the

[0010] Claim 3 The invention described in claim 1 is characterized in that the support body includes a pair of left and right leg components and a joint material that is interposed between the left and right leg components and connects the left and right leg components to each other, and in the use position, the load of a seated person can be transmitted to the joint material via the shell body and the horizontal frame portion. 1 or 2 This is the chair described.

[0011] Claim 4 The invention described in claims 1 and 2 is characterized in that the support body includes a pair of left and right leg components and a joint material that is interposed between the left and right leg components and connects the left and right leg components to each other, and in that, in the use position, the load of a seated person can be transmitted to the joint material via the shell body and the horizontal frame portion. or This is the chair described in 3.

[0012] Claim 5The invention described in claims 1, 2 and 3 is characterized in that the frame portion is provided with a shaft insertion hole penetrating in the left-right direction, and the frame portion is supported rotatably with respect to a shaft member that is inserted into the shaft insertion hole and attached to the support. or This is the chair described in 4. Effect of the Invention

[0013] As described above, according to the present invention, a chair can be provided in which the seat can be rotated between a usable position in which the seat can be sat on and an upright position in which the seat is raised above the floor, and which can provide optimal cushioning for the seated person. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 4 is a right side view showing a stacked state in the embodiment. [Figure 10] Cross-sectional view taken along line XX in FIG. 2. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. 4 is an enlarged view illustrating a hole in the embodiment. [Figure 19] Cross-sectional view taken along line YY in FIG. 17. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] Cross-sectional view taken along line ZZ in Figure 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of the chair will now be described.

[0016] 1 to 15 is a chair that can be stacked on the floor in the front-rear direction with other chairs of the same structure. The chair includes a support A having leg components 1 formed by aluminum die casting, a cushion-type seat B1 rotatably supported by the support A, a back panel C supported by the support A, and an optional memo pad D supported by the support A.

[0017] Each component of the chair will be described in detail below.

[0018] <<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.

[0019] <Leg component 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 from the upper end of the rear leg 11 toward the front side, and a joint portion 13 extending from the longitudinal middle portion of the front leg 12, the tip of which is connected to the side end portion of the joint material 2.

[0020] Casters 14 are provided at the bottom ends of the rear legs 11 and the front legs 12. Rear dampers F made of synthetic resin are provided on the inner surfaces of the left and right rear legs 11 to provide a buffer function for other chairs entering from the rear when stacking, and to provide a positioning function for other chairs.

[0021] The rear legs 11 extend in the vertical direction. The rear legs 11 extend in the vertical direction in a forward-leaning position in side view. The rear legs 11 are inclined so that their lower portions are positioned more outward than their upper portions in front and rear views.

[0022] 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 constituent member 1. The extension part c2 of the back panel C and the back panel connection part 11a are fixed together by a screw v1.

[0023] The front legs 12 are equipped with inclined front leg portions 12a that extend linearly in a backward tilted position in a side view, and upper front leg portions 12b that extend in the front-rear direction and connect the upper end of the inclined front leg portion 12a to the upper end of the rear leg 11. In the front legs 12, the inclined front leg portions 12a are located in the front, and the upper front leg portions 12b are located in the rear.

[0024] The front legs 12 are inclined so that their lower portions are positioned more inward than their upper portions when viewed from the front and rear. The width of the inclined front leg portions 12a in a side view is set to be shorter than the width of the upper front leg portions 12b in a side view.

[0025] The front leg 12 has a holding portion 12c on the inner side of the upper front leg portion 12b located at the top thereof, which is capable of rotatably supporting the seat B1. The holding portion 12c has a bottomed hole shape that opens inward. A shaft member P for pivotally supporting the seat B1 is attached to the holding portion 12c.

[0026] The joint portion 13 is provided to protrude 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 substantially horizontally from the inclined front leg portion 12a in a side view. The joint portion 13 extends inward substantially horizontally in a front view.

[0027] The joint part 13 extends obliquely forward in bottom view. 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 part of the joint material 2. The leg constituent member 1 having the joint part 13 is connected to the joint material 2 by using a screw v2 inserted into the screw insertion hole h1 of the tip part 13b of the joint part 13.

[0028] The screw v2 connecting the joint material 2 and the leg component 1 is concealed by a cover G which is generally L-shaped in plan view and which also serves as a buffer against other chairs.

[0029] The rear dampers F are attached to the inner surfaces of the left and right rear legs 11 constituting the leg component 1, respectively.

[0030] <Joint material 2> The joint material 2 is in the shape of a rectangular column 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 is in the shape of a substantially rectangular column 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.

[0031] The lower surface of the horizontal frame part 7 of the seat B1 in the usage position (S) abuts against the upward surface 22 of the joint material 2 via the cushioning member 73. The joint material 2 is provided with nut parts h2 into which screws v2 inserted from the outside can be screwed at both left and right ends. The joint material 2 is attached to the joint part 13 provided on the leg constituent member 1 by the screws v2.

[0032] A memo pad D is attached to the joint material 2. A base end arm component 91 of the arm 9 is rigidly connected to a downward surface 23 of the joint material 2 by welding.

[0033] << 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 on the floor surface. The seat B1 is configured so as to be changeable between the usage position (S) in which the seat surface m1 faces upwards and the seat can be seated on by a seated person, and the standing position (U) in which the seat B1 stands up on 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.

[0034] Seat B1 comprises a cushion-type seat body J consisting of a cushion 4 arranged on a shell body 3 having a downwardly bulging shape, and a seat frame K capable of supporting the seat body J. In seat B1, in the usage position (S), the weight of a seated person can be transmitted to the joint material 2 via the upholstery 5, cushion 4, shell body 3, and cross-bridge frame portion 7.

[0035] <Seat body J> The seat body J is supported by the support A via the 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.

[0036] The shell body 3 includes a shell body main body 31 constituting the main part, and a frame attachment part 32 protruding downward from the lower surface of the shell body main body 31. The shell body main body 31 and the frame attachment part 32 constituting the shell body 3 are integrally formed from synthetic resin.

[0037] The shell body main body 31 has a substantially 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 recessed shape toward the lower side. In the shell body main body 31, a cushion accommodating space sp capable of accommodating the cushion 4 is formed based on the recessed shape toward the lower side.

[0038] 10, the central portion in the left-right direction of the shell body main body 31 has a substantially S-shaped cross section. In other words, the shell body main body 31 has a front portion 31a that is recessed upward at the position where the frame splice portion 32 is provided, and a rear portion 31b that bulges downward.

[0039] In other words, 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.

[0040] 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.

[0041] The shell body 3 is attached to the horizontal frame portion 7 of the seat frame K. More specifically, a frame attachment portion 32 is provided to protrude downward from the center in the front-rear direction of the lower surface of the shell body main body 31. The frame attachment portion 32 is configured to be constantly in contact with the upper surface of the horizontal frame portion 7 of the seat frame K.

[0042] A claw engagement portion ka is provided at the rear portion of the shell body 3, with which a claw portion tm provided on the seat frame K can engage.

[0043] The frame attachment portion 32 comprises a front horizontal rib 32a which forms an upright wall extending in the left-right direction, a rear horizontal rib 32b which forms an upright wall extending in the left-right direction and is arranged approximately parallel to and spaced apart from the front horizontal rib 32a, and a vertical rib 32c which forms an upright wall extending in the front-to-rear direction and is arranged at three locations, the left, right and central portions, to connect the front horizontal rib 32a and the rear horizontal rib 32b.

[0044] 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 corresponding to the recessed shape of the shell body main body 31. In other words, the lower part of the cushion 4 has a shape that fills the cushion storage space sp provided in the shell body main body 31.

[0045] 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 endowed with suitable cushioning properties.

[0046] The upholstery 5 is mainly made of fabric and covers the upper surface and peripheral edge of the cushion 4 as well as the peripheral edge 3e of the shell body 3. The edge 5e of the upholstery 5 is held between the lower surface of the peripheral edge 3e of the shell body 3 and the upper surface of the frame part 6 of the seat frame K by an appropriate method.

[0047] <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 supported rotatably on the support body A via an axis member P. The seat frame K, which is pivotally supported on 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.

[0048] The seat frame K includes a frame portion 6 that is in contact with the underside of the peripheral portion of the seat body J, and a horizontal frame portion 7 that is suspended from the frame portion 6. The seat frame K is formed by integrally forming the frame portion 6 and the horizontal frame portion 7 from synthetic resin.

[0049] The frame portion 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.

[0050] The left and right side frame portions 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 at 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 of the side frame portions 61. The frame portion 6 is made of, for example, reinforced nylon or the like and has high rigidity, and cooperates with the shaft members P directly attached to the left and right leg constituent members 1 to prevent the left and right leg constituent members 1 from separating from each other.

[0051] The horizontal frame portion 7 has a curved shape that is convex downward when viewed from the front. The horizontal frame portion 7 is installed between the left and right side frame portions 61 of the frame portion 6. The horizontal frame portion 7 has inclined extension portions 71 that protrude diagonally downward from the inner surfaces of the left and right side frame portions 61, and a horizontal horizontal portion 72 that extends approximately horizontally in the left-right direction between the tips of the left and right inclined extension portions 71. A rectangular plate-shaped buffer member 73 is provided on the lower surface of the horizontal horizontal portion 72, and the buffer member 73 is adapted to come into contact with the joint material 2.

[0052] <<Backboard 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 parts c2 that extend downward from the left and right lower end parts of the back panel main body c1.

[0053] The back plate C is adapted so that fitting holes (not shown) provided in the left and right extensions c2 are fitted onto the back plate connecting 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 connecting parts 11a.

[0054] <<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 which can support the top plate 8 so that its position can be changed.

[0055] The top plate 8 is a generally rectangular plate. The position of the top plate 8 can be changed with respect to the arm 9 between a generally horizontal use position (M) and a retracted position (T) retracted from the use position (M). That is, 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) on which various objects can be placed and the retracted position (T) in which the top plate 8 hangs down vertically.

[0056] The arm 9 is made of a metal pipe material. The arm 9 includes a base end arm component 91 which is a base end extending in a substantially straight line in the left-right direction, an intermediate arm component 93 which is a straight part connected to the left end which is one end of the base end arm component 91 via a lower bent part 92 which is a bent part, located below the joint part 13 and extending along the longitudinal direction of the joint part 13, a main arm component 95 which is connected to the left end which is one end of the intermediate arm component 93 via a rear bent part 94 which is a bent part, and extends in a straight line obliquely upward and forward from the base end to the tip, and a front end arm component 97 which is connected to the front end of the main arm component 95 via a front bent part 96 which is a bent part, and extends in a straight line forward.

[0057] The base-end arm component 91 is integrally connected to the joint material 2. That is, 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.

[0058] 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.

[0059] The intermediate arm component 93 is set so as 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 connected to each other via a bracket br. Since the intermediate arm component 93 is located so as to fit along the lower side of the joint portion 13, it is unlikely to spoil the appearance.

[0060] In this embodiment, the bracket br is fixed in advance to the intermediate arm component 93 by welding. The intermediate arm component 93 is stably supported by the joint portion 13 by screwing a screw v3 inserted into a screw insertion hole h3 of the bracket br into a nut (not shown) provided on the joint portion 13.

[0061] The tabletop support mechanism L is of a known configuration comprising a first rotation support part L1 rotatably mounted on the front-end arm component 97 around the axis of the tip of the arm 9, i.e., around the axis of the front-end arm component 97, and a second rotation support part L2 having a mounting plate L21 rotatably mounted relative to the first rotation support part L1 and screwed to the underside of the tabletop 8.

[0062] A chair equipped with a seat B1 and a memo stand D is configured so that it can be nested in the front-to-back direction with other chairs of the same structure with the seat B1 held in an upright position (U) and the top plate 8 of the memo stand D held in a retracted position (T), as shown in Figure 9.

[0063] <> 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 detachably attached to the seat frame K using screws v4 as fasteners.

[0064] Figure 13 shows two types of seat bodies J and E. The seat body J shown in Figures 13 and 14 is a cushion type in which upholstery 5 is stretched over the upper surface of a cushion 4, with the upper surface of the upholstery 5 serving as a seating surface m1. The seat body E shown in Figures 13 and 15 is a seat board type in which the upper surface of a plate-like body serves as a seating surface m2.

[0065] The two types of seat bodies J, 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, E, it is possible to attach either one of the two types of seat bodies J, E to the seat frame K in a state where it is attached to the support body A.

[0066] The cushion-type seat body J cannot constitute 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 located at a position where it can prevent the shaft member P connecting the support body A and the seat frame K from being inserted or removed.

[0067] Furthermore, even if one were to attach a cushion-type seat body J to a seat frame K to form seat B1 and then attempt to attach said seat B1 to a support body A, the shell body 3 that constitutes the seat body J would get in the way and prevent the shaft member P from being inserted into the seat frame K and the support body A, making it impossible to attach seat B1 to the support body A.

[0068] <<Seat B2 type>> As shown in Fig. 16, the chair is configured so that a plate-type seat B2 comprising a seat frame K and a plate-type seat body E can be constructed by mounting a plate-type seat body E to a seat frame K pivotally supported on a support A. Like the cushion-type seat B1, the plate-type seat B2 is configured to be rotatable between a use position (S) in which the seat can be seated on the support A and a standing position (U) in which the seat stands upright on the floor.

[0069] The seat plate type seat body (hereinafter referred to as "seat plate E") has a seat plate body E1 which is approximately rectangular in plan view and has a plurality of holes N penetrating in the vertical direction, and a peripheral portion E2 provided on the outer periphery of the seat plate body E1.

[0070] The seat panel body E1 constituting the seat panel E has a plurality of holes N, the holes N provided in the central region R in the front-rear and left-right directions being the largest among the plurality of holes N provided in the seat panel body E1. The sizes of the plurality of holes N provided in the seat panel body E1 are formed so as to gradually decrease from the central region R outward, i.e., toward the peripheral edge portion E2 surrounding the outer periphery of the seat panel body E1.

[0071] In other words, the outward direction from the central region R includes the forward direction, the rearward direction, both left and right sides, the diagonally forward direction, and the diagonally rearward direction from the central region R.

[0072] The thickness dimension of the seat panel body E is set to be approximately uniform as a whole. Therefore, the volume of the hole N is set to gradually decrease from the central region R toward the outside.

[0073] Among the multiple holes N drilled in the up-down direction in the seat panel body E1, the holes N provided in the area near the peripheral edge E2 are formed to be the smallest. The seat panel body E1 is formed so that the holes N become gradually smaller and disappear in the process from the central region R to the peripheral edge E2.

[0074] Six other holes N are arranged around a particular hole N at approximately equal distances therebetween.

[0075] 18, the opening edge Ne forming the multiple holes N has a substantially symmetrical shape with respect to the center point ct in the front-rear and left-right directions in a plan view. In other words, the opening edge Ne forming the multiple holes N has a point-symmetrical shape with respect to the virtual center point ct.

[0076] The opening edges Ne of the holes N are shaped to have no sharp corners of 90° or less in plan view. More specifically, the opening edges Ne are shaped such that the four sides of a square indicated by a two-dot chain line are curved outwardly in plan view, as shown in Fig. 18.

[0077] 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 a frame constituting the chair, that is, a frame portion 6 of a seat frame K supported by a support body A. In other words, the frame portion 6, which is a frame constituting the chair, constitutes a seat panel type seat B2 together with the seat panel E constituted by the seat panel main body E1 and the peripheral portion E2.

[0078] The frame capable of supporting the peripheral portion of the seat plate is not limited to that constituting the seat as shown in FIG. 16, and may be, for example, that shown in FIG.

[0079] The chair shown in Fig. 20 has a seat plate H and a back plate Q supported by a support frame I. The frame constituting the chair in the figure refers to the support frame I, which includes a base frame portion i1, which is a leg frame, a front leg frame portion i2, and a rear leg frame portion i3, and is made of metal pipes and metal plates.

[0080] As for the specific configuration of seat panel H, except for the specific structure for supporting it on the support frame I, it is the same as the seat panel type seat body (seat panel E), so it will be explained using the same symbol and detailed explanation will be omitted.

[0081] The support frame I supporting the seat plate H comprises a pair of base frame portions i1 extending in the front-to-rear direction approximately parallel to the floor surface, a front leg frame portion i2 erected on the front end of the base frame portion i1, a rear leg frame portion i3 erected on the rear end of the base frame portion i1, a side seat support frame portion i4 erected between the upper end of the front leg frame portion i2 and the upper end of the rear leg frame portion i3, a front cross frame portion i5 connecting the front ends of the side seat support frame portions i4, a rear cross frame portion i6 connecting the rear ends of the side seat support frame portions i4, and a back support frame portion (not shown) extending upward from the upper end of the rear leg frame portion i3 and the rear end of the side seat support frame portion i4.

[0082] The rear leg frame portion i3, the base frame portion i4, the front leg frame portion i2, the side seat support frame portion i4, and the back support frame portion are formed continuously from a single metal pipe.

[0083] The front lateral frame portion i5 and the rear lateral frame portion i6 are formed of metal plates.

[0084] The front cross frame portion i5 and the rear cross frame portion i6 are formed from metal plates, and the left and right side seat support frame portions i4 are formed from metal pipe material, forming a square-shaped seat support frame IW that can support the peripheral portion E of the seat plate H.

[0085] As described above, the chair according to this embodiment has a seat B1 supported so as to be rotatable between a use position (S) in which the seat can be seated on the support A and a standing position (U) in which the seat B1 stands upright on the floor. The seat B1 includes 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 a peripheral portion 3e of the seat body J.

[0086] This makes it possible to provide a chair in which the seat B1 can be rotated between a seatable use position (S) and a standing position (U) in which it is upright against the floor, and which can provide optimal cushioning for the seated person.

[0087] That is, the seat B1 has the cushion 4 supported by the 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 person. In other words, the seat B1 contributes to improving the sitting comfort for the seated person by allowing the cushion 4 to function optimally.

[0088] The seat frame K includes a horizontal frame portion 7 suspended from the frame portion 6. The shell body 3 is spliced ​​to the horizontal frame portion 7.

[0089] Therefore, the shell body 3 housing the cushion 4 can be suitably supported by the horizontal frame portion 7 of the seat frame K.

[0090] Moreover, since the underside of the shell body 3 is supported by the horizontal frame portion 7, a space is provided 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 not only supports the shell body 3, but also increases the degree of freedom in designing the shell body 3 so that it can accommodate a large amount of cushion 4.

[0091] The frame section 6 includes left and right side frame portions 61 extending in the front-rear direction, 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 cross frame section 7 is installed between the front-rear direction intermediate portions of the left and right side frame portions 61.

[0092] For this reason, the horizontal frame portion 7 is provided at a suitable position where it can support the shell body 3. In addition, since the horizontal frame portion 7 is located at the middle portion in the front-rear direction of the frame portion K, it contributes to the degree of freedom in designing the shell body 3 so that it can accommodate as many cushions 4 as possible.

[0093] 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.

[0094] The front portion 31a of the shell body 3, which is surrounded by the front annular portion K1, has an upwardly concave shape, and the rear portion 31b of the shell body 3, which is surrounded by the rear annular portion K2, has a downwardly bulging shape.

[0095] Therefore, the shell body 3 has a suitable shape that can provide suitable cushioning to the seated person. That is, 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, suitable cushioning can be provided to the buttocks of the seated person.

[0096] In addition, the structure in which the shell body 3 is supported by the seat frame K is excellent in reducing the amount of material used for the seat B1 and making it lighter.

[0097] The support body A includes a pair of left and right leg constituent members 1, and a joint material 2 that is interposed between the left and right leg constituent members 1 and connects the left and right leg constituent members 1. In the usage posture (S), the load of a seated person can be transmitted to the joint material 2 via the shell body 3 and the cross-bridge frame portion 7.

[0098] Therefore, the seat B1 has a suitable structure for transmitting the weight of the seated person to the support A.

[0099] The frame portion 6 has an axis insertion hole 61a penetrating 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.

[0100] Therefore, by attaching the seat body J to the seat frame K, the entire seat B1 is supported relative to the support A so as to be rotatable.

[0101] It should be noted that the present invention is not limited to the embodiment described above in detail.

[0103] The shell body may have any suitable shape without departing from the spirit and scope of the present invention.

[0104] 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 have a shape that bulges downward.

[0105] Also, the portion of the shell body surrounded by the front annular portion and the portion surrounded by the rear annular portion may be configured to be elastically deformable under the load of a seated person.

[0106] Furthermore, 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. [Explanation of symbols]

[0107] A...Support B1…Location C…Backboard D…Memo stand (optional) J…Seat body 3…Shell body 4. Cushion 5…Upholstery

Claims

1. 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.

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

3. 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.

4. 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.

5. 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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