JP2022055655A - Chair - Google Patents

Abstract

To provide a chair excellent in design freedom, capable of setting strength capable of supporting a seated person according to the site of a seat.SOLUTION: In a chair having a seat B supported rotatably through a shaft member J between a seating posture seatable to a support medium A and an upright posture erected to a floor surface, the seat B includes a seat body 3 having a seat shell 3S, and a seat lower frame 4 in which a right direction intermediate part is connected to the seat shell 3S, and right-and-left both ends are connected to the support medium A through the shaft member J.SELECTED DRAWING: Figure 9

Description

The present invention relates to a chair preferably used in an office or the like.

Conventionally, a chair having a seat rotatably supported between a use posture that can be seated on a leg and an upright posture that stands on a floor surface has been known (for example, Patent Document 1). reference).

The seat of this type of chair is equipped with a seat shell made of synthetic resin supported by the legs via a shaft member. The seat shell is made of a resin material having a relatively high rigidity as a whole so that the rigidity that can withstand the load of the seated person can be ensured.

The inventor has found that the application of a highly rigid resin material is required for a specific region of the seat shell, while the required rigidity can be ensured for other regions without applying a highly rigid resin material. rice field.

That is, the conventional seat shell tends to have an over-engineered configuration because it has to apply a resin material having high rigidity as a whole, and the design is such that the resin material can be selectively applied according to the seat portion. The degree of freedom was severely limited.

The above situation is the same even when a material different from the synthetic resin is applied to the seat.

Japanese Unexamined Patent Publication No. 2009-82684

The present invention has been made by paying attention to the above circumstances, and an object of the present invention is to provide a chair having an excellent degree of freedom in which the strength capable of supporting a seated person can be flexibly set according to a seat portion. ..

That is, the present invention has the following configuration.

The invention according to claim 1 is a chair having a seat rotatably supported via a shaft member between a use posture that can be seated on a support and an upright posture that stands on a floor surface. The seat has a seat body having a seat shell, and an intermediate portion in the left-right direction is connected to the seat shell, and both left and right ends are connected to the support via the shaft member. It is a chair equipped with.

The invention according to claim 2 is the chair according to claim 1, which is configured to be stackable in the front-rear direction with other chairs having the same structure while the seat is in the upright posture.

In the invention according to claim 3, the seat shell and the seat frame are each made of synthetic resin, and the seat shell is formed separately from the seat shell. Or it is the chair described in 2.

According to the fourth aspect of the present invention, the seat shell connecting portion in which the seat frame extends substantially linearly in the left-right direction and the upper surface side is in contact with the lower surface of the seat shell, and the left and right ends of the seat shell connecting portion. 2. The chair described.

In the invention according to claim 5, the seat shell connecting portion is provided with a screw insertion hole penetrating in the vertical direction, and a screw inserted through the screw insertion hole is provided in a nut portion provided in the seat shell. The chair according to claim 4, wherein the seat body is attached to the under-seat frame by screwing.

The invention according to claim 6 is the chair according to claim 4 or 5, wherein the left and right extension arms are gradually extended outward toward the rear.

The invention according to claim 7 is claimed 1, 2, 3, 4 in which both end portions of the rear portion of the seat shell are provided at positions capable of suppressing the detachment of the shaft member from the under-seat frame. 5 or 6 is the chair.

The invention according to claim 8 is the chair according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the seat frame is made of a resin having higher rigidity than the seat shell. be.

According to a ninth aspect of the present invention, the seat body covers the seat shell, the cushion supported by the seat shell, and the outer surface of the cushion, and the end edge is provided on the lower surface of the seat shell. The chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8, which is provided with an upholstery to be accommodated in.

The invention according to claim 10, wherein the rigidity of the under-seat frame is set higher than the rigidity of the seat shell according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9. It is a chair.

As described above, according to the present invention, it is possible to provide a chair having an excellent degree of freedom in which the strength capable of supporting the seated person can be flexibly set according to the seat portion.

The perspective view which shows one Embodiment of this invention. Front view in the same embodiment. The rear view in the same embodiment. Right side view in the same embodiment. The plan view in the same embodiment. Bottom view in the same embodiment. The right side view which shows the stacking state in the same embodiment. The right side view which shows the stacking state in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. The X-direction arrow view in FIG. Partially enlarged front view in the same embodiment. The exploded front view in the same embodiment. The exploded plan view in the same embodiment. Partially enlarged right side view showing another embodiment. Central sectional view of the tip of a leg in the same embodiment. Right side view showing another embodiment. Partially enlarged bottom view in the same embodiment. Right side view showing another embodiment. Partially enlarged bottom view in the same embodiment. The perspective view which shows one Embodiment of this invention. The perspective view which shows the other embodiment. FIG. 16 is a sectional view taken along line YY. The perspective view which shows the other embodiment.

Hereinafter, one embodiment of the chair will be described with reference to FIGS. 1 to 15.

The chair of this embodiment is rotatably supported via a shaft member J between a sitting posture (H) with respect to the support A and an standing posture (K) standing with respect to the floor surface. It has a seat B.

The chair is configured to be stackable in the front-rear direction on the floor surface with other chairs having the same structure in the state where the seat B is in the upright posture (K). Further, the chair is configured to be stackable in the vertical direction with other chairs having the same structure in the state where the seat B is in the use posture (H). That is, this chair is configured to be stackable in both the front-rear direction and the up-down direction.

The chair has a support A having a pair of left and right leg components 1 formed by die-casting aluminum, a seat B rotatably supported by the support A via a shaft member J, and a support. It is equipped with a backrest C supported by A.

Hereinafter, each configuration of this chair will be described in detail.

<< Support A >>
The support A is composed of left and right leg constituent members 1 formed by injection molding aluminum die casting in pairs on the left and right, and members separate from the left and right leg constituent members 1, and the left and right leg constituent members. It is provided with a joint material 2 that is interposed between the ones and connects the two.

<Leg component 1>
The left and right leg constituent members 1 have a substantially symmetrical shape. The left and right leg components 1 are integrally formed by die-casting aluminum. The left and right leg components 1 are the rear leg 11, the front leg 12 integrally extending from the inner side to the front side at the upper end of the rear leg 11, and the front leg 12 extending inward from the upper part of the front leg 12. A rear extension portion provided with a joint portion 13 whose tip portion is connected to the side end portion of the joint material 2 and a portion to which the extension seat B and the backrest C can be integrally connected rearward from the rear end portion of the front leg 12. It is equipped with 14.

The hind legs 11 extend in the vertical direction. The hind legs 11 extend in a substantially straight line in the vertical direction in a posture of leaning forward in a lateral view. The hind legs 11 are in an inclined posture so that the lower part is located outside the upper part in the front view and the back view. A caster 17 is provided at the lower end of the rear leg 11. The rear leg 11 has a first smooth surface 11 m facing upward at the upper end portion, and a second smooth surface 12 m which is the upper surface of the upper front leg portion 12b of the front leg 12 and a third surface which is the upper surface of the rear extension portion 14. It is flush with the smooth surface of 14 m.

The front leg 12 has an inclined front leg portion 12a extending linearly in a backward tilted posture in a lateral view, and an upper end portion and a rear portion of the inclined front leg portion 12a extending in the front-rear direction in a posture tilted backward from the inclined front leg portion 12a. It is provided with an upper front leg portion 12b that connects the upper end portion of the leg 11. The front legs 12 are in a posture extending in a substantially vertical direction in front view and back view. A caster 17 is provided at the lower end of the front leg 12.

As shown in FIG. 22, the caster 17 has a recessed portion 17c formed by a caster body 17a rotatably connected to the rear legs 11 and the front legs 12 and wheels 17b provided on the left and right sides of the caster body 17a. It is formed. As shown in the figure, the recessed portion 17c of the caster 17 has a recessed portion 17c with respect to the rear leg 11 and the front leg 12 in other chairs having the same structure so that the stacking posture can be stabilized during stacking in the vertical direction. Can be engaged so as to straddle.

A holding protrusion t1 capable of holding the front damper F so as to project rearward is integrally provided on the back surface side of the vertical intermediate portion of the inclined front leg portion 12a. The holding protrusion t1 is provided with a nut portion n1 to which a screw v1 for attaching the front damper F is screwed.

The front damper F attached after the inclined front leg portion 12a is made of, for example, hard rubber, and has a substantially trapezoidal shape in a side view. The front damper F can come into contact with the front legs 12 of the other chairs when stacking in the vertical direction with other chairs having the same structure. The front damper F can exert a cushioning function with other chairs and a positioning function with other chairs at the time of stacking. The contact surface fs of the front damper F, which can abut on the front end surface of the front leg in another chair, has a concave shape with respect to the curved shape of the front end surface of the front leg in the other chair. That is, the contact surface fs of the front damper F can come into surface contact with the front end surface of the front leg in another chair, and is configured to be hard to shift during stacking.

The front damper F is formed with a holding piece disposing slit f1 into which the holding piece t1 of the inclined front leg portion 12a is inserted, and a screw insertion hole h1 communicating with the holding piece disposing slit f1 is provided in the inner portion. It has been drilled. That is, the front damper F is fixed to the front leg 12 by screwing the screw v1 inserted into the screw insertion hole h1 to the nut portion n1 of the holding protrusion t1.

The upper front leg portion 12b is formed with a second smooth surface 12m facing upward. The second smooth surface 12m is substantially flush with the first smooth surface 11m of the rear leg 11 and the third smooth surface 14m which is the upper surface of the rear extending portion 14. On the lower surface side of the upper front leg portion 12b, nut portions n6 are provided at two front and rear positions.

The joint portion 13 is integrally projected from the upper part of the front leg 12 toward the inside. The joint portion 13 extends from the inner surface side of the upper front leg portion 12b of the front leg 12. The joint portion 13 is provided with a screw insertion hole h2 penetrating in the left-right direction at the tip portion 13a thereof. The tip portion 13a of the joint portion 13 has a shape that can be fitted to the joint material 2.

The joint portion 13 is located on the rear side of the inclined front leg portion 12a, the lower side of the upper front leg portion 12b, and the front side of the rear leg 11 in the front leg 12. Therefore, the screw insertion hole h2 into which the screw v2 for attaching the joint material 2 is inserted is arranged at a suitable position so as not to interfere with the front leg 12 and the rear leg 11. Further, by providing the joint portion 13 at the above-mentioned location, the left and right leg constituent members 1 can be connected via the joint material 2 in a manner excellent in strength.

The tip portion 13a of the joint portion 13 is internally fitted into the recessed portion 21 provided at the end portion of the joint material 2. Then, the leg component 1 having the joint portion 13 screwed the screw v2 inserted into the screw insertion hole h2 of the tip portion 13a of the joint portion 13 to a nut portion (not shown) provided at the end portion of the joint material 2. By doing so, it is connected to the joint material 2.

A recessed portion 13b that also serves as a passage for the screw v2 is formed on the lower surface of the joint portion 13. A nut portion n7 and a screw insertion hole h2 are arranged at positions facing the recessed portion 13b.

In this embodiment, the upper front leg portion 12b and the joint portion 13 constitute an optional mounting portion R to which an optional armrest D, memo stand E, or the like can be mounted. That is, a plurality of nut portions n6 and n7 are provided on the lower surfaces of the upper front leg portion 12b and the joint portion 13, and the support connecting portions d1 and e1 which are the base ends of the armrest D and the memo stand E are provided on the upper front leg. The armrest D and the memo stand E can be attached to the support A by screwing them to the nuts n6 and n7 of the portion 12b and the joint portion 13.

The rear extending portion 14 is integrally extended from the rear end portion of the upper front leg portion 12b of the front leg 12 toward the rear. The upper front leg portion 12b and the rear extending portion 14 extend linearly in the front-rear direction in a lateral view. The rear extension portion 14 has a rectangular columnar shape as a whole. The rear end portion of the rear extension portion 14 is inserted so as to be able to engage with the opening portion M formed on the front surface of the backrest C. That is, the rear end portion of the rear extension portion 14 is inserted into the space sp formed inside the backrest C through the opening M formed in the front surface of the backrest C.

The rear extending portion 14 is provided with a holding portion 14a for rotatably supporting the seat B on the inner surface side in the intermediate portion in the front-rear direction. The holding portion 14a has a bottomed hole shape that is open inward. The outer end portion of the shaft member J for axially supporting the seat B is fastened to the holding portion 14a.

A flat plate-shaped positioning piece t2 is provided between the outer surface of the front end portion of the rear extending portion 14 and the back surface of the upper end portion of the rear leg 11. The positioning piece t2 is inserted into the positioning piece arrangement slit g21 provided in the rear damper G so that the rear damper G can be positioned at a predetermined position.

Here, the rear damper G is made of, for example, hard rubber, and is attached to the lower surface of the rear extending portion 14 by using a screw v3. The rear damper G is positioned integrally extending outward from the inner damper portion g1 and the inner damper portion g1 provided with the screw insertion hole h3 which is attached to the lower surface of the rear extension portion 14 and through which the screw v3 is inserted. It is provided with an outer damper portion g2 provided with a one-sided arrangement slit g21.

The rear damper G is a rear extension portion by screwing a screw v3 inserted into a screw insertion hole h3 provided in the inner damper portion g1 to a nut portion n3 provided on the lower surface side of the rear extension portion 14. It is fixed to 14.

The rear damper G can exert a cushioning function with other chairs and a positioning function with other chairs at the time of stacking. The rear damper G can come into contact with the support A of the other chairs in both the case of stacking in the vertical direction and the case of stacking in the front-rear direction with other chairs having the same structure.

When stacking in the vertical direction, the back surface of the outer damper portion g2 in the rear damper G can come into contact with the front surface of the rear legs 11 of the other chair. During stacking in the front-rear direction, the bottom surface of the inner damper portion g1 in the rear damper G can come into contact with the upper surface of the upper front leg portion 12b in another chair.

A first back plate connecting portion 15 extending upward is integrally provided at the rear end portion of the rear extending portion 14. The first back plate connecting portion 15 has a rectangular plate shape extending upward from the upper portion at the rear end portion of the rear extending portion 14. The first back plate connecting portion 15 is formed so that the width dimension and the thickness dimension gradually become shorter toward the upper side. The first back plate connecting portion 15 is fitted in the first fitting recess s2 formed in the backrest C.

A second back plate connecting portion 16 projecting inward is provided at the rear end portion of the rear extending portion 14. The second back plate connecting portion 16 has a rectangular columnar shape extending inward from the inner portion at the rear end portion of the rear extending portion 14. The second back plate connecting portion 16 is fitted inside the second fitting recess s3 formed in the backrest C. The second back plate connecting portion 16 is provided with a screw insertion hole h4 penetrating in the vertical direction. The backrest C refers to the support A by screwing the screw v4 inserted into the screw insertion hole h4 of the second back plate connecting portion 16 to the nut portion n4 facing the second fitting recess s3. It can be attached.

The upper surface of the rear extending portion 14 is provided with a third smooth surface 14 m, which is a smooth surface. The third smooth surface 14m is flush with the first smooth surface 11m of the rear leg 11 and the second smooth surface 12m of the front leg 12. The first, second, and third smooth surfaces 11m, 12m, and 14m provided on the left and right leg constituent members 1 each face diagonally forward and upward directions that are easily visible to the user, and are uneven with respect to the user. It can give a smart impression without a feeling.

Further, since the upper front leg portion 12b and the rear extending portion 14 are integrally formed, the front portion extends linearly in the front-rear direction in an inclined posture so that the front portion is located below the rear portion in a lateral view. When stacking in the front-rear direction, it is positioned along the upper front leg portion 12b and the rear extension portion 14 in other chairs having the same structure.

<Joint material 2>
The joint material 2 has a prismatic shape extending in the left-right direction. The joint material 2 can function as a seat holder that can support the seat B in the used posture (H) from below. The joint material 2 has a substantially square columnar shape extending in the left-right direction. The joint material 2 plays a role of connecting the left and right leg constituent members 1.

The lower part of the seat B in the usage posture (H), more specifically, the tip portions of the left and right protrusions 32 projecting from the seat shell 3S abut on the upper surfaces of both ends of the joint material 2 via the shock absorber kt. It has become like. The joint material 2 includes a nut portion (not shown) into which a screw v2 inserted from the outside can be screwed into a recessed portion 21 provided at both left and right ends.

<< Seat B >>
The seat B is rotatably supported by the shaft member J between the use posture (H) in which the seated person can sit and the upright posture (K) in which the seater stands up against the floor surface with respect to the support A. It was done. The seat B has a usage posture (H) capable of stacking in the vertical direction with other chairs having the same structure and an upright posture (K) capable of stacking in the front-rear direction with other chairs having the same structure. It is configured so that the posture can be changed between. The seat B is connected to the rear extension portion 14 of the support A via the shaft member J.

The seat B includes a seat body 3 in which a cushion 33 is arranged on a shell-shaped synthetic resin seat shell 3S, and a synthetic resin seat frame 4 capable of supporting the seat body 3. It is a thing. In the seat frame 4, the middle portion in the left-right direction is connected to the seat shell 3S, and the left and right ends are connected to the support A via the shaft member J.

<Seat body 3>
The seat body 3 is a stretched material that covers the seat shell 3S, the cushion 33 supported by the seat shell 3S, and the outer surface of the cushion 33, and the end edge te is accommodated in the accommodation groove mz provided on the lower surface of the seat shell 3S. It is equipped with 34.

The seat shell 3S has a seat shell main body 31 constituting a main portion having a downwardly bulging shape, and a protrusion 32 as a support connecting portion projecting from the lower surface of the seat shell main body 31 in pairs to the left and right. It is prepared. The seat shell main body 31 and the protrusion 32 constituting the seat shell 3S are integrally formed of synthetic resin.

The seat shell body 31 has a substantially rectangular shape in a plan view. The seat shell main body 31 is provided with an upright wall-shaped rib rb extending in the front-rear direction, the left-right direction, and the diagonal direction on the upper surface side. The seat shell main body 31 is formed with a storage groove mz capable of accommodating the edge te of the upholstery 34 over the entire circumference in the vicinity of the peripheral edge portion on the lower surface side.

In this embodiment, both end portions of the rear portion of the seat shell main body 31 are provided at positions that can suppress the detachment of the shaft member J from the seat frame 4.

A recess 31a opened downward for attaching the seat shell connecting portion 41 of the seat shell frame 4 is formed on the lower surface side of the rear portion of the seat shell main body 31. The recess 31a has a shape recessed upward. The seat shell 3S is positioned with respect to the seat shell 4 by fitting the recess 31a with respect to the upper portion of the seat shell connection portion 41 in the seat frame 4.

The recess 31a is formed at a position where the upholstery 34 can be avoided, that is, inside the accommodating groove mz provided in an annular shape in the bottom view. The seat shell main body 31 is provided with a screw insertion hole h5a that penetrates between the upper surface side and the lower surface side in the vertical direction. A plurality of screw insertion holes h5a are provided at positions corresponding to the recesses 31a.

A nut n5 is arranged at a position corresponding to the screw insertion hole h5 on the upper surface side of the seat shell main body 31. A screw v5 inserted into a screw insertion hole h5b provided in the seat shell 4 and a screw insertion hole h5a provided in the seat shell 3S is screwed to the nut n5 arranged on the upper surface side of the seat shell main body 31. It has become like.

The protrusion 32 is projected downward from the lower surface of the central portion in the front-rear direction of the seat shell main body 31. A shock absorber kt is provided at the tip of the protrusion 32.

The cushion 33 is made of a known material such as urethane foam and has a constant elastic rebound force. The cushion 33 is mounted on the seat shell 3S.

The upholstery 34 is mainly composed of a cloth and covers the upper surface and the peripheral edge of the cushion 33 and also covers the peripheral edge of the seat shell 3S. The edge te of the upholstery 34 is accommodated in the accommodating groove mz provided on the lower surface of the seat shell 3S near the peripheral edge over the entire circumference.

<Seat frame 4>
The under-seat frame 4 is made of synthetic resin extending in the left-right direction. The under-seat frame 4 is formed separately from the seat shell 3S.

The under-seat frame 4 is integrated with the seat shell connecting portion 41, which extends substantially linearly in the left-right direction and whose upper surface side is in contact with the lower surface of the seat shell 3S, from both left and right ends of the seat shell connecting portion 41 toward the outside. It is provided with left and right extension arm portions 42 having a shaft member holding hole u2 extending to the tip portion to hold the shaft member J.

The seat shell connecting portion 41 is provided with screw insertion holes h5b penetrating in the vertical direction at a plurality of locations. The under-seat frame 4 also inserts the screw v5 inserted through the screw insertion hole h5b into the screw insertion hole h5a provided in the seat shell 3S, and then screwes the screw v5 into the nut n5 which is a nut portion arranged in the seat shell 3S. As a result, it can be connected to the seat shell 3S.

The left and right extension arm portions 42 are extended so as to be gradually located rearward and gradually upward toward the outside.

The outer end of the left and right extension arm portions 42 is provided with a shaft member holding hole u2 capable of holding the shaft member J for rotatably supporting the seat B. A flange portion j1 is formed at the inner end portion of the shaft member J. The flange portion j1 of the shaft member J can be attached to the opening edge on the inner surface side of the shaft member holding hole u2.

The under-seat frame 4 is made of a resin having a higher rigidity than the seat shell 3S. The under-seat frame 4 is formed of, for example, a highly rigid resin such as reinforced nylon, and cooperates with the shaft member J directly attached to the left and right leg constituent members 1 to cooperate with the left and right leg constituent members. 1s are kept from each other.

<< Backrest C >>
The backrest C has a backrest surface that can be attached to the back of the seated person, and has a substantially rectangular shape in front view. The backrest C is a so-called back plate type, and is made of a synthetic resin having a plate shape as a whole. In the backrest C of this embodiment, the lower end portion ce of the intermediate portion in the left-right direction is located below the seating surface zm of the seat B.

The lower end of the backrest C is provided in pairs on the left and right, and is a space sp that is open to the front and is formed inside. An opening M that can communicate with the space formed by the fitting recesses s2 and s3 is provided. The rear end portion of the rear extension portion 14 is inserted into the opening M whose lower portion is open. The left and right rear extension portions 14 that can support the backrest C are inserted so as to be able to engage with the left and right openings M, respectively.

The space sp formed inside the backrest C is a front wall c1 that can form a front surface in the lower part of the backrest C, a side wall c2 that can form a side surface in the lower part of the backrest C, and a lower part of the backrest C. It is surrounded by a rear wall c3 that can form a back surface. The front wall c1 is provided with an opening M that is open forward and possible by cutting out a corner portion at the lower end in a rectangular shape.

That is, the space sp provided inside the backrest C accommodates a portion that can support the backrest C. The space sp of the backrest C is formed on the rear extension portion accommodating section portion s1 in which the rear end portion of the rear extension portion 14 is accommodated and the rear extension portion 14, and is formed on the rear extension portion 14, and is the first back plate connection portion. A second space portion formed by the first fitting recess s2 into which the 15 is internally fitted, and a second back plate connecting portion 16 located inside the rear extending portion accommodating section portion s1 and to which the second back plate connecting portion 16 is internally fitted. It is composed of a space portion formed by the fitting recess s3.

The opening edges of the opening M to which the rear extending portion 14 is inserted and the outer surface of the rear extending portion 14 can be engaged are the outer and inner side opening edges m1 and m2 extending in the vertical direction, and the outer and inner sides. It is composed of an upper opening edge m3 extending in the left-right direction connecting the upper ends of the inner side opening edges m1 and m2. The outer side opening edge m1 is configured by a front edge at the lower end of the side wall c2.

The backrest C is provided with a nut portion n4 at a position facing the second fitting recess s3. A screw v4 inserted into the screw insertion hole h4 of the second back plate connecting portion 16 can be screwed to the nut portion n6. That is, the backrest C is screwed to the support A by screwing the screw v4 inserted into the screw insertion hole h4 of the second back plate connecting portion 16 to the nut portion n4 facing the second fitting recess s3. It is attached to the other.

<Leg tip member S>
In this chair, instead of the casters 17 provided on the rear legs 11 and the front legs 12, a leg tip member S having a flat ground contact surface s11 facing downward and in contact with the floor surface can be provided. .. That is, this chair has a specification in which casters 17 are provided at the lower ends of the rear legs 11 and the front legs 12 without changing the shape of the leg constituent member 1, and a specification in which the casters 17 are not provided at the lower ends of the rear legs 11 and the front legs 12 ( That is, it is possible to select (specification for providing the leg tip member S).

The leg tip member S is attached to the lower end portion of the inclined front leg portion 12a of the rear leg 11 and the front leg 12. The leg tip member S extends in the same direction as the longitudinal direction of the inclined front leg portion 12a of the rear leg 11 and the front leg 12, that is, in an oblique direction as a whole. Although FIGS. 16 and 17 show the leg tip member S attached to the inclined front leg portion 12a of the front leg 12, the leg tip member S can be similarly attached to the rear leg 11.

The leg tip member S includes a leg tip member main body s1 made of synthetic resin and a leg tip member main body s1 which extends in the same direction as the longitudinal direction of the inclined front leg portion 12a of the front leg 12 and has a horizontal contact surface s11 formed at the lower end thereof. It is provided with a connection column s2 which is erected in a substantially vertical direction in the central portion of a substantially horizontal pedestal portion s12 formed on the upper portion of s1 and is inserted into a mounting hole u1 provided at the lower end portion of the inclined front leg portion 12a. It is a thing.

The leg tip member main body s1 has an upright wall s13 formed on the outside of the pedestal portion s12. The upright wall s13 can cover the outside of the lower end portion of the inclined front leg portion 12a.

The connecting column s2 includes a column body s21 extending in the vertical direction and a projecting piece s22 for preventing rotation projecting laterally from the column body s21. The connecting strut s2 having the projecting piece s22 is inserted into the keyhole-shaped mounting hole u1 provided at the lower ends of the front leg 12 and the rear leg 11, and the diagonally extended leg tip member S is the front leg 12 and the rear leg 11. It is designed not to rotate with respect to.

<< Armrest D / Memo stand E >>
As shown in FIGS. 18 to 21, the chair of this embodiment can be attached with an optional armrest D or memo stand E to the support A.

The armrest D includes a support connecting portion d1 provided at the lower end portion and adjacent to the option mounting portion R, an arm portion d2 extending upward from the outer end portion of the support connecting portion d1, and rearward from the upper end of the arm portion d2. It is provided with an elbow rest portion d3 having an extended upper surface as an elbow rest surface.

A screw insertion hole h6 into which a screw v6 screwed into the nut portion n6 of the upper front leg portion 12b is inserted and a screw v7 screwed into the nut portion n7 of the joint portion 13 are inserted into the support connecting portion d1 of the armrest D. A screw insertion hole h7 is provided. The rear portion of the support connecting portion d1 is fitted into the recessed portion 13b of the joint portion 13 and is positioned.

The support connection portion d1 of the armrest D has a first connection block portion d11 extending along the upper front leg portion 12b and a front end portion of the first connection block portion d11 with respect to the first connection block portion d11. The second connection block portion d12 extending in a direction substantially orthogonal to each other and fitted in the recessed portion 13b of the joint portion 13 and the reinforcing connecting portion connecting the lower ends of the first and second connection block portions d11 and d12. It is provided with d13.

The first and second connection block portions d11 and d12 constituting the support connection portion d1 are substantially L-shaped. Further, the reinforcing connecting portion d13 has a substantially triangular shape.

The memo stand E is provided at the lower end portion of the support connecting portion e1 which is attached to the option mounting portion R, the arm portion e2 extending upward from the outer end portion of the support connecting portion e1, and the upper end of the arm portion e2. It is provided with a top plate e4 supported via a rotation support mechanism e3 that can rotate in a biaxial direction.

The support connection portion e1 of the memo stand E has a screw insertion hole h6 into which a screw v6 screwed to the nut portion n6 of the upper front leg portion 12b is inserted, and a screw v7 to be screwed to the nut portion n7 of the joint portion 13. A screw insertion hole h7 to be inserted is provided. The rear portion of the support connecting portion e1 is fitted into the recessed portion 13b of the joint portion 13 and is positioned.

The support connection portion e1 of the memo stand E has the same structure as the support connection portion d1 of the armrest D.

The support connection portion e1 of the memo stand E has a first connection block portion e11 extending along the upper front leg portion 12b and a front end portion of the first connection block portion e11 to the first connection block portion e11. Reinforcing connection between the second connection block portion e12 extending in a direction substantially orthogonal to each other and fitted in the recessed portion 13b of the joint portion 13 and the lower ends of the first and second connection block portions e11 and e12. It is provided with a portion e13.

The first and second connection block portions e11 and e12 constituting the support connection portion e1 are substantially L-shaped. Further, the reinforcing connecting portion e13 has a substantially triangular shape.

As described above, in the chair according to the present embodiment, the chair is placed between the usable posture (H) that can be seated on the support A and the standing posture (K) that stands up against the floor surface via the shaft member J. It has a seat B that is rotatably supported.

Then, the seat B is connected to the seat body 3 having the seat shell 3S made of synthetic resin, the left-right intermediate portion is connected to the seat shell 3S, and the left and right both ends are connected to the support A via the shaft member J. It is provided with a seat frame 4 made of synthetic resin.

Therefore, it is possible to provide a chair having an excellent degree of freedom in design in which the resin material can be selectively applied according to the portion of the seat B.

That is, by applying a resin material softer than the under-seat frame 4 to the seat shell 3S, the degree of freedom of the shape in the seat shell 3S can be increased, and the flexibility that can contribute to the comfort of the seated person can be contributed. It will be possible to give sex. On the other hand, the lower frame 4 is made of a resin material having a higher rigidity than the seat shell 3S, so that the strength of the seat B as a whole is appropriately secured.

In other words, the rigidity of the under-seat frame 4 can be easily set higher than the rigidity of the seat shell 3S.

With the seat B in the upright posture (K), it is configured to be stackable in the front-rear direction with other chairs having the same structure.

Therefore, when not in use, a plurality of chairs having the same structure can be compactly put together.

The under-seat frame 4 is formed separately from the seat shell 3S. Therefore, the under-seat frame 4 and the seat shell 3S can be manufactured separately and independently, the complexity of the mold can be suitably suppressed, and the assembly work can be suitably performed. ..

The under-seat frame 4 extends in a substantially straight line in the left-right direction and is integrated with the seat shell connecting portion 41 whose upper surface side is in contact with the lower surface of the seat shell 3S from both left and right ends of the seat shell connecting portion 41 toward the outside. It is provided with left and right extension arm portions 42 having a shaft member holding hole u2 extending to the tip portion to hold the shaft member J.

Therefore, the under-seat frame 4 can have a suitable configuration in which the seat shell 3S can be fixed and rotatably connected to the support A.

The seat shell connecting portion 41 is provided with a screw insertion hole h5b penetrating in the vertical direction, and the screw v5 inserted through the screw insertion hole h5b is screwed into the nut n5 which is a nut portion provided in the seat shell 3S. As a result, the seat body 3 is attached to the seat frame 4.

Therefore, by using the screw v5, the seat shell 3S can be easily attached to the seat frame 4.

The left and right extension arm portions 42 are extended so as to be gradually located rearward toward the outside.

Therefore, the shaft member holding hole u2 and the seat shell connecting portion 41 can be provided at suitable positions.

Both end portions of the rear portion of the seat shell 3S are provided at positions capable of suppressing the detachment of the shaft member J from the seat shell frame 4.

Therefore, after completion, for example, a person other than the manufacturer cannot easily disengage the shaft member J from the support A, and the support A and the seat B are difficult to disengage easily. It has a structure.

The lower frame 4 is made of a resin having higher rigidity than the seat shell 3S.

For this reason, the seat B is unlikely to be over-engineered as a whole, and it is possible to realize the seat B which is excellent in economy while ensuring the required rigidity.

The seat body 3 covers the seat shell 3S, the cushion 33 supported by the seat shell 3S, and the outer surface of the cushion 33, and the end edge te is accommodated in the accommodation groove mz provided on the lower surface of the seat shell 3S. It is equipped with 34.

Therefore, the seat body 3 can be provided with a suitable configuration capable of exhibiting flexibility based on the cushion 33.

The present invention is not limited to the embodiment described in detail above.

Various configurations can be applied to the configuration of the support, and the configuration is not limited to that shown in the above-described embodiment.

The seat shell and the seat frame are not limited to those made of synthetic resin. For example, the seat shell and the seat frame may be made of metal.

The seat body may have a seat shell, and the presence or absence of cushions and upholstery can be appropriately set.

The chairs may not be stackable in the front-back and up-down directions.

Needless to say, the resin material applied to the seat body and the seat frame can be an appropriate one.

Various shapes of the under-seat frame can be adopted without departing from the spirit of the present invention.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

A ... Support (H) ... Usage posture (K) ... Standing posture J ... Shaft member B ... Seat 3 ... Seat body 3S ... Seat shell 4 ... Seat frame

Claims (10)

A chair having a seat that is rotatably supported via a shaft member between a usable posture that can be seated on a support and an upright posture that is upright on a floor surface.
The seat includes a seat body having a seat shell, and an under-seat frame in which an intermediate portion in the left-right direction is connected to the seat shell and both left and right ends are connected to the support via the shaft member. The chair that is. The chair according to claim 1, wherein the seat is configured to be stackable in the front-rear direction with other chairs having the same structure in the upright posture. The seat shell and the seat frame are each made of synthetic resin.
The chair according to claim 1 or 2, wherein the seat frame is formed separately from the seat shell. The under-seat frame extends substantially linearly in the left-right direction, and the upper surface side is integrally attached to the lower surface of the seat shell with the seat shell connection portion and the left and right end portions of the seat shell connection portion toward the outside. The chair according to claim 1, 2 or 3, further comprising left and right extending arm portions having a shaft member holding hole formed in the tip portion thereof so as to be extended. The seat shell connection portion is provided with a screw insertion hole penetrating in the vertical direction, and the screw inserted through the screw insertion hole is screwed into a nut portion provided in the seat shell to cause the seat body. The chair according to claim 4, wherein is attached to the under-seat frame. The chair according to claim 4 or 5, wherein the left and right extension arms are extended so as to be gradually located rearward toward the outside. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein both end portions of the rear portion of the seat shell are provided at positions capable of suppressing the detachment of the shaft member from the seat frame. The chair according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the under-seat frame is made of a resin having higher rigidity than the seat shell. The seat body comprises the seat shell, a cushion supported by the seat shell, and an upholstery covering the outer surface of the cushion and accommodating an edge in a storage groove provided on the lower surface of the seat shell. The chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8. The chair according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the rigidity of the under-seat frame is set higher than the rigidity of the seat shell.

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