JP7173726B2 - Chair - Google Patents

Description

The present invention relates to a chair suitable for use in offices and the like.

2. Description of the Related Art Conventionally, various chairs are known in which a support frame mainly made of metal pipe material supports a seat and a backrest (see, for example, Patent Document 1).

By the way, in this type of chair, when the seat and the backrest are in contact with each other or close to each other, it is usual to attach the backrest after the seat is supported by the support frame. .

However, with such a structure, the screws for attaching the backrest to the support frame tend to be exposed to the outside, which is one of the factors that spoil the appearance.

JP-A-11-309041

SUMMARY OF THE INVENTION It is an object of the present invention to provide a chair with a high degree of freedom in design that can provide a suitable appearance without complicating the structure. .

That is, the present invention has the following configurations.

According to a first aspect of the present invention, there is provided a chair having a seat and a backrest supported by a support frame, the backrest having a back plate made of synthetic resin, and the back plate It is fixed to a support frame with screws, and the back plate has a main body portion forming a backrest surface and left and right extending portions protruding downward from the main body portion. wherein the left and right extending portions comprise an extending portion main body and projections projecting forward or leftward from the lower ends of the extending portion main bodies, respectively, and these projections include Screw insertion holes through which the screws can be inserted are formed, and the support frame includes base frame portions that form a pair on the left and right and extend in the front-rear direction, and front leg frames erected on the front ends of the base frame portions. a rear leg frame portion erected on the rear end portion of the base frame portion; a side seat receiving frame portion constructed between the upper end of the front leg frame portion and the upper end of the rear leg frame portion; A front horizontal frame connecting the front ends of the seat support frames, a rear horizontal frame connecting the rear ends of the side seat support frames, and extending upward from the upper end of the rear leg frame. and a spine support frame portion, wherein the extension body is fitted onto the spine support frame portion and supported by the support frame, and the projecting portion is supported by the screw. The seat is fastened to the rear horizontal frame portion by the screw inserted through the insertion hole, and the seat includes the side seat receiving frame portion, the front horizontal frame portion, and the rear horizontal frame portion. The seat frame includes a seat frame arranged on the frame portion and an upholstery stretched in the seat frame, the seat frame covering the screw and the projecting portion, and the screw covering the seat . This is a chair that cannot be visually recognized when viewed from the rear and obliquely above the surface .

As described above, according to the present invention, it is possible to provide a chair with excellent design freedom that can provide a suitable appearance without complicating the structure.

1 is a perspective view showing one embodiment of the present invention; FIG. The perspective view in the same embodiment. The front view in the same embodiment. The rear view in the same embodiment. The right side view in the same embodiment. The top view in the same embodiment. The bottom view in the same embodiment. FIG. 4 is a cross-sectional view taken along the line XX in FIG. 3; FIG. 9 is a partially enlarged sectional view in FIG. 8; The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The perspective view in the same embodiment. The bottom view in the same embodiment. The right side view in the same embodiment. The enlarged view for description of the spacer in the same embodiment. The perspective view for description of the spacer in the same embodiment. The disassembled perspective view in the same embodiment. The disassembled perspective view in the same embodiment. The front view of the backrest (back plate) in the same embodiment. Y partial enlarged view in FIG.

An embodiment of the present invention will now be described with reference to FIGS. 1-20.

This embodiment applies the present invention to a chair A that is preferably used in offices, conference rooms, educational facilities, and the like. As shown in FIGS. 14 to 16, this chair A is constructed such that other chairs A having the same shape can be vertically stacked.

A chair A has a support frame B supporting a seat E and a support frame B supporting a backrest F. At the lower end of the support frame B, there are provided a front spacer C and a rear spacer D which are spacers positioned between the support frame B and the floor surface in use.

The support frame B comprises a pair of left and right base frame portions g1 extending in the front-rear direction substantially parallel to the floor surface, front leg frame portions g2 erected from the front end portions of the base frame portion g1, and the base frame portion g1. A rear leg frame portion g3 erected at the rear end portion, a side seat receiving frame portion g4 constructed between the upper end portion of the front leg frame portion g2 and the upper end portion of the rear leg frame portion g3, and a side seat receiving frame portion. From the front horizontal frame portion H that connects the front end portions of g4, the rear horizontal frame portion I that connects the rear end portions of the side seat support frame portions g4, and the upper end portion of the rear leg frame portion g3 An outer back support frame portion J serving as a back support frame portion extending upward, and an inner back support frame extending upward along the outer back support frame portion J from the rear end of the side seat support frame portion g4. Part K.

The outer back support frame part J, the rear leg frame part g3, the base frame part g1, the front leg frame part g2, the side seat support frame part g4, and the inner back support frame part K are formed in this order by a single metal pipe. It is formed continuously by the material. In other words, the support frame B integrally includes the outer back support frame portion J, the rear leg frame portion g3, the base frame portion g1, the front leg frame portion g2, the side seat receiving frame portion g4, and the inner back support frame portion K. It is provided.

A rear leg frame portion g3, a base frame portion g1, a front leg frame portion g2, and a side seat support frame portion g4, which are arranged in pairs on the left and right, constitute a left leg element G and a right leg element G. ing. A front horizontal frame portion H and a rear horizontal frame portion I connecting the left and right leg elements G are formed of metal plates.

A front spacer C, which is a spacer, is attached to the lower surface of the front end portion of the base frame portion g1 with a screw v1. A rear spacer D is attached to the lower surface of the rear end portion of the base frame portion g1 with a screw v2.

The distance between the front leg frame parts g2, which are arranged in pairs on the left and right, is the same as the rear legs, which are arranged in pairs on the left and right, in order to enable stacking with another chair A having the same shape. It is set shorter than the separation distance of the frame portion g3. The front leg frame portion g2 is composed of a lower front leg frame portion g21 which is continuous from the front end portion of the base frame portion g1 and extends obliquely inward when viewed from the front, and an upper end of the lower front leg frame portion g21 which extends substantially vertically upward. and an extended upper front leg frame portion g22.

The side seat receiving frame portion g4 is shaped so as to be in contact with the lower surface of the side seat frame portion 11 of the seat E so as to support the seat E. As shown in FIG. The side seat receiving frame portion g4 has a gentle S shape when viewed from the side. The side seat receiving frame portion g4 comprises, in order from the front, a first forward tilting frame portion g41, a rearward tilting frame portion g42, and a second forward tilting frame portion g43.

The first forward leaning frame portion g41 can be attached to the lower surface of the first forward leaning portion 111 of the side seat frame portion 11 of the seat frame 1 . The rearward tilting frame portion g42 can be attached to the lower surface of the rearward tilting portion 112 of the side seat frame portion 11 of the seat frame 1 . The second forward leaning frame portion g43 can be attached to the lower surface of the second forward leaning portion 113 of the side seat frame portion 11 of the seat frame 1 .

The front horizontal frame portion H is made of a metal plate having an upward U-shape in the middle portion in the left-right direction. 12 can be supported from below. The front horizontal frame portion H has, near its left and right ends, screw insertion holes h1 through which screws v3 for fixing the seat frame 1 can be inserted. The left and right ends of the front horizontal frame portion H are attached to the front end portions of the side seat receiving frame portions g4 by welding.

The rear horizontal frame portion I can support the rear seat frame portion 13 of the seat frame 1 from below. The rear horizontal frame portion I connects the rear end portions of the left and right side seat receiving frame portions g4. The rear horizontal frame portion I has a curved shape that protrudes rearward in plan view or bottom view. The rear horizontal frame portion I includes a rear horizontal frame portion main body i1 which has upper and lower surfaces and is inclined forward, and an upright frame portion i2 integrally erected from the rear end edge of the rear horizontal frame portion main body i1. and

The rear horizontal frame main body i1 has, near its left and right ends, a screw insertion hole i11 extending vertically through which a screw v4 for fixing the seat frame 1 can be inserted. The upright frame portion i2 has, near its left and right ends, a screw insertion hole i22 penetrating in the front-rear direction through which a screw v5, which is a fastening tool for the backrest for fastening the back plate L, can be inserted. The screw insertion holes i22 of the upright frame portion i2 are provided in the protrusions i21 protruding upward near the left and right ends of the upright frame portion i2. The left and right ends of the rear horizontal frame portion I are attached to the rear end portion of the side seat receiving frame portion g4 by welding.

The front spacer C and the rear spacer D are for stably supporting the support frame B supporting the seat E and the backrest F on the floor surface. The front spacer C and the rear spacer D are blocks made of synthetic resin. The outer side surfaces c3 and d3 of the front spacer C and the rear spacer D are substantially trapezoidal and flush when viewed from the side. The maximum width dimension of the front spacer C and the rear spacer D is set to be larger than the width dimension of the base frame portion g1 and not more than 1.2 times the width dimension of the base frame portion g1.

The front spacer C has a floor contact surface c2 that can contact the floor surface in use. The front spacer C is attached to the front portion of the base frame portion g1 of the support frame B with screws v1. The front spacer C has a concave portion c1 on the inner surface side of its front end portion. The front spacer C is provided with a screw insertion hole c4 penetrating vertically.

The floor contact surface c2 forms the lower surface of the front spacer C. As shown in FIG. The floor contact surface c2 includes a main contact surface forming portion c21 provided at the rear portion, and an extension portion positioned in front of the main contact surface forming portion c21 and provided narrower than the main contact surface forming portion c21. and a contact surface forming portion c22.

The concave portion c1 forms a storage space sp in which a part of the support frame B of another chair A can be positioned during stacking. The recessed portion c1 has a recessed portion forming surface c11 inclined forward in a side view. During stacking, this recessed portion forming surface c11 can come into contact with a portion of the lower end portion of the front leg frame portion g2 of another chair A having the same structure. That is, the recessed portion forming surface c11 formed in the recessed portion c1 of the front spacer C abuts on the upper surface of the lower front leg frame portion g21 of the front leg frame portion g2 of the other chair A. The relative position with A can be determined.

The front spacer C has a substantially rectangular outer surface, and the entire surface from the front end to the rear end has a planar shape without steps or recesses. The front spacer C has an overall shape based on a rectangular parallelepiped, and has a concave portion c1 extending from the inner surface side of the front end portion to the floor contact surface c2 within the range. Thus, when a plurality of chairs A having the same shape are vertically stacked, the front leg frame portion g2 of the lower chair A is positioned so as to fit into the concave portion c1 of the front spacer C of the upper chair A. It has become. The front spacer C has a rectangular parallelepiped shape along the extending direction of the base frame portion g1. That is, since the front spacer C does not protrude greatly outward from the base frame g1, the entire chair A can be made compact.

In consideration of the stability of the support frame B (for example, stability against forward tilting), it is preferable to attach the front spacer C to the front side of the support frame B as much as possible. Moreover, it is preferable to make the distance between the front spacer C and the rear spacer D as large as possible. On the other hand, if the position of the front spacer C is excessively extended to the front side of the support frame B, it will interfere with the front leg frame part g2 of the other chair A located below in the stacking state. Malfunctions can occur. The front spacer C of this embodiment solves this problem by forming a concave portion c1 in a part of the inner surface of the front end portion.

The seat E is supported by a support frame B. The seat E has a seat frame 1 having a substantially square frame shape and an upholstery 2 stretched inside the seat frame 1 . The seat frame 1 and the upholstery 2 are integrated by thermocompression molding.

The seat frame 1 includes left and right side seat frame portions 11 extending in the front-rear direction, a front seat frame portion 12 extending in the left and right direction connecting front ends of the left and right side seat frame portions 11, and left and right side seat frame portions 11. and a rear seat frame portion 13 connecting the rear ends of the two.

The left and right side seat frame portions 11 are supported by the side seat receiving frame portions g4 of the support frame B from below. The left and right side seat frame portions 11 form a gentle S shape in a side view so as to follow the shape of the side seat receiving frame portion g4. That is, the left and right side seat frame portions 11 have a first forward tilting portion 111 which is positioned at the front end portion and has a forward tilting posture when viewed from the side, and a rear end of the first forward tilting portion 111 which extends continuously. It has a rearward tilting portion 112 that tilts backward when viewed from the side, and a second forward tilting portion 113 that is continuous from the rear end of the rearward tilting portion 112 and tilts forward when viewed from the side.

The first forward tilting portion 111 is supported from below by the first forward tilting frame portion g41 of the side seat receiving frame portion g4. The rearwardly inclined portion 112 is supported from below by the rearwardly inclined frame portion g42 of the side seat receiving frame portion g4. The second forward tilting portion 113 is supported from below by the second forward tilting frame portion g43 of the side seat receiving frame portion g4.

As shown in FIGS. 7 and 10, on the lower surfaces of the left and right side seat frame portions 11, pull-up members 11a, which are substantially rectangular in bottom view and substantially L-shaped in front and rear views, are screwed. Attached by v6. The drawing member 11a engages with the lower surface of the side seat frame portion g4 at its outer end portion, and is attached to the left and right side seat frame portions 11 and side seat receivers by screwing the screws v6 into the left and right side seat frame portions 11. The frame portion g4 is drawn.

The front seat frame portion 12 spans between the front ends of the left and right side seat frame portions 11 . The front seat frame portion 12 is supported by the front horizontal frame portion H of the support frame B from below.

The rear seat frame portion 13 is supported by the rear horizontal frame portion I from below. The rear seat frame portion 13 has a hanging wall 131 projecting downward from its rear edge. At both left and right ends of the rear seat frame portion 13, cutout portions 132 are provided for disposing the outer back support frame portion J, the inner back support frame portion K, and the left and right extending portions N of the back plate L. ing.

The seat E can hide the screw v5 which is a backrest fixture for fixing the back plate L to the rear horizontal frame portion I of the support frame B. As shown in FIG. That is, the rear seat frame portion 13 of the seat frame 1 of the seat E can cover the screw v5 for screwing the back plate L to the rear horizontal frame portion I so as to be difficult to see from the outside.

In the chair A shown in this embodiment, a backseat frame 13, which is a part of the seat E, is arranged so as to cover the projection 6 formed integrally with the back plate L of the backrest F. As shown in FIG. In the chair A, the seat E is attached to the support frame B after the back plate L is attached to the support frame B. The back plate L of the chair A cannot be removed unless the seat E is removed. In other words, the chair A in this embodiment includes a projection 6 that is part of the back plate L and a seat E that can hide the screw v5 that is inserted through the screw insertion hole 61 of the projection 6 . Thus, the seat E can be independently removed from the support frame B without difficulty without removing the back plate L from the support frame B.

The upholstery 2 is in the form of a sheet stretched on the seat frame 1. - 特許庁The upholstery 2 is made of a flexible woven fabric, and does not have shape-retaining properties by itself. The upholstery 2 is supported by the seat frame 1 at its periphery. In other words, the upholstery 2 is arranged in the area surrounded by the seat frame 1 .

The upholstery 2 has a horizontal tension, that is, a force that pulls the left and right side seat frame portions 11 toward each other, rather than a longitudinal tension, that is, a force that pulls the front seat frame portion 12 and the rear seat frame portion 13 toward each other. is set to be stronger. More specifically, the upholstery 2 consists of a plurality of wefts (not shown) extending in the left-right direction and a plurality of warps (not shown) extending in the front-rear direction and having elastic properties different from those of the wefts. Be prepared. In the upholstery 2, the elasticity of the weft is set higher than that of the warp.

The rear portion of the upholstery 2 forms a rear seating surface 23 which is an elastically deformable seating surface which is set to gradually rise toward the rear. A central portion of the upholstery 2 in the front-rear direction forms a central seating surface 22 which is an elastically deformable seating surface which is set so as to be positioned gradually downward toward the rear. The front portion of the upholstery 2 forms an elastically deformable front seating surface 21 which is set to gradually rise toward the rear.

In other words, the front portion of the upholstery 2 supported between the first forward-inclined portions 111 in the side seat frame portion 11 of the seat frame 1 constitutes the front seating surface 21, and the side seat frame portion of the seat frame 1 is provided. The center of the upholstery 2 supported between the rearwardly inclined portions 112 in 11 constitutes a central seating surface 22, and is supported between the second forwardly inclined portions 113 of the side seat frame portion 11 of the seat frame 1. The rear part of the upholstery 2 which is covered constitutes a rear seating surface 23 . In addition, in FIG. 9, the cross section of the upholstery 2 is indicated by a thick line so that it can be easily grasped.

The upholstery 2 supported by the seat frame 1 in this embodiment can take a so-called three-dimensional raised form only by the upholstery 2 . In other words, the upholstery 2 can assume a three-dimensionally protruded form without external force being applied by other members to the portion inside the peripheral edge. That is, the entire upholstery 2 follows the shape of the side seat frame portion 11 that supports the upholstery 2 in a side view, and has an S-shaped undulation in a side view. In addition, by differentiating the tension of the upholstery 2 in the front-rear direction and in the left-right direction, the degree of the S-shaped undulations in the central portion of the upholstery 2 in the left-right direction is closer to the side seat frame portion 11 than that. It is set looser than the degree of S-shaped undulation at the position.

The backrest F has a back plate L made of synthetic resin.

The back plate L includes a body portion M having a backrest surface formed on the front side, and left and right extending portions N projecting downward from the body portion M. As shown in FIG.

The body part M comprises a back plate body 3 formed with a plurality of holes p penetrating in the front-rear direction, and vertical spine support parts 4 arranged on the left and right sides of the back plate body 3 and extending vertically. is.

The back plate main body 3 has a substantially rectangular shape. The back plate main body 3 is provided with a plurality of holes p penetrating in the front-rear direction. A plurality of holes p formed in the back plate main body 3 has a substantially rectangular shape when viewed from the front. More specifically, the plurality of holes p have a substantially square shape when viewed from the front.

In this specification, the term "substantially square" includes four sides that are slightly curved so as to form an outward or inward convexity.

The back plate main body 3 constitutes a main part capable of supporting the back of the seated person. The back plate main body 3 is formed such that its thickness dimension gradually decreases toward the upper side. As shown in FIG. 20, the back plate main body 3 is provided with horizontal belt portions 31 extending substantially linearly in the horizontal direction between the holes p adjacent to each other in the vertical direction and connecting the vertical spine support portions 4 . . A plurality of horizontal band portions 31 are arranged vertically over substantially the entire area of the back plate main body 3 except for the upper and lower ends 33 and 34 .

In addition, in FIG. 20, for the convenience of grasping the horizontal band portion 31, a linear dashed line is shown on the area corresponding to the horizontal band portion 31. As shown in FIG.

As shown in FIG. 19, the back plate body 3 extends substantially linearly in the vertical direction so as to connect the upper and lower ends 33 and 34 of the back plate body 3 between the holes p adjacent to each other in the left-right direction. It has a longitudinal band portion 32 which A plurality of vertical band portions 32 are arranged in the horizontal direction only in the left and right end regions 3 a of the back plate main body 3 .

In addition, in FIG. 20, for convenience of grasping the vertical band portion 32, a linear dashed line is shown on the region corresponding to the vertical band portion 32. As shown in FIG.

As shown in FIG. 19, the width dimension of the hole p provided in the central region 3b of the back plate main body 3 is larger than the width dimension of the hole p provided in the peripheral region 3c located in the outer peripheral region of the central region 3b. is set. That is, the size of the hole p provided in the back plate main body 3 is set so as to gradually decrease from the central region 3b toward the peripheral region 3c.

A plurality of holes p linearly arranged in the left-right direction at substantially the same height position are provided in the back plate body 3 so that the distance between the center points of adjacent holes p increases toward the peripheral edge region 3c. ing. In other words, the pitch of the plurality of holes p linearly arranged in the left-right direction is set to increase from the central region 3b toward the peripheral region 3c. The imaginary lines ks connecting the center points of the plurality of holes p linearly arranged in the left-right direction are set so as to be parallel in the up-down direction and at approximately equal intervals when viewed from the front.

One hole p and the other hole p, which are vertically adjacent to each other, are provided in the back plate main body 3 so that their center points do not coincide with each other in the vertical direction.

The left and right vertical spine support parts 4 are arranged on the left and right so as to sandwich the back plate main body 3. - 特許庁The left and right vertical spine support portions 4 maintain the rigidity capable of supporting the back plate main body 3, and are not provided with holes penetrating in the front-rear direction. Left and right extended portions N projecting downward are integrally provided at the lower ends of the left and right vertical spine support portions 4 .

The left and right extensions N have an extension body 5 which has a columnar appearance and has a storage section (not shown) which is bored in the interior in the vertical direction and accommodates the outer back support frame section J and the inner back support frame section K. , a projecting portion 6 projecting inward from the lower end portion of the extension portion main body 5 and a flange portion 7 projecting forward from the lower end portion of the extension portion main body 5 .

The protruding portion 6 has a plate shape and protrudes from the lower end portion of the extending portion main body 5 along the rear side of the standing frame portion i2 of the rear horizontal frame portion I. As shown in FIG. That is, the left and right projecting portions 6 are projecting pieces. A screw insertion hole 61 is formed in the central portion of each of the left and right protruding portions 6 as a fastener insertion hole through which a screw v5, which is a fastener for the backrest, can be inserted.

The flange portion 7 is positioned on the rear end portion of the side seat receiving frame portion g4. The flange portion 7 is covered from above by the rear end portion of the side seat frame portion 11 facing the notch portion 132 of the seat E. As shown in FIG. That is, the collar portion 7 is arranged at a position where it can be sandwiched between the support frame B and the seat E.

The back plate L is supported by the support frame B by being externally fitted on the outer back supporting frame portion J in a standing posture and the inner back supporting frame portion K in a standing posture. In addition, the back plate L is attached to the laterally extending rear horizontal frame portion I constituting the support frame B so that it does not slip out of the outer back support frame portion J and the inner back support frame portion K. is fastened by In this embodiment, the screw v5 is hidden by the rear seat frame portion 13, which is a part of the seat E, and is visible when viewed from above the seat surface, that is, when viewed in a posture normally assumed by the user. Impossible. The chair A is easily visible from diagonally above, and in order to improve its appearance, it is necessary to pay attention to its appearance from the rear diagonally above.

As described above, the chair A according to this embodiment has the support frame B supporting the seat E and the backrest F. As shown in FIG. The backrest F has a back plate L made of synthetic resin. The back plate L is fixed to the support frame B by a screw v5, which is a fixing tool for the backrest. Further, the screw v5 is invisible when viewed from above. Therefore, it is possible to provide the chair A with excellent design freedom that can provide a suitable appearance without complicating the structure. That is, since the screw v5 cannot be visually recognized from above, it is possible to preferably prevent the appearance of the chair A from being spoiled by the presence of the screw v5.

The seat E hides the screw v5, which is a fastener for the backrest. In other words, since the screw v5 is covered by the seat E without applying a separate and independent special structure to cover the screw v5, a suitable appearance is obtained without increasing the number of parts and complicating the structure. It is possible to provide a chair A excellent in design freedom that can provide.

A back plate L is fixed to a frame portion of the support frame B extending in the left-right direction with screws v5. More specifically, the support frame B is provided with a rear horizontal frame portion I serving as a horizontal frame portion connecting the left and right leg elements G, and the back plate L is attached to the rear horizontal frame portion I by screws v5. It is to be fastened against. Therefore, the screw v5 can be disposed at a suitable position where it can be concealed using the seat E.

A seat E includes a seat frame 1 and an upholstery 2 stretched in the seat frame 1. - 特許庁The seat frame 1 can cover the screw v5 from above. Therefore, by using the shape of the seat frame 1, the chair A can preferably cover the screw v5 from above.

The support frame B comprises a pair of left and right base frame portions g1 extending in the front-rear direction, front leg frame portions g2 erected at the front ends of the base frame portions g1, and rear end portions of the base frame portions g1. The standing rear leg frame part g3, the side seat receiving frame part g4 constructed between the upper end of the front leg frame part g2 and the upper end of the rear leg frame part g3, and the front end part of the side seat receiving frame part g4 are connected. A front horizontal frame portion H, a rear horizontal frame portion I serving as a horizontal frame portion connecting the rear ends of the side seat receiving frame portions g4, and a back support extending upward from the upper end of the rear leg frame portion g3. It is provided with an outer back support frame portion J as a frame portion. The seat frame 1 is arranged on the side seat support frame portion g4, the front horizontal frame portion H, and the rear horizontal frame portion I, and the back plate L is the outer back support frame portion J. and is supported by the support frame B. Therefore, the back plate L partially covered by the seat E and the seat E partially covering the back plate L are each preferably supported by the support frame B. there is

The back plate L includes a body portion M forming a backrest surface and left and right extending portions N protruding downward from the body portion M. - 特許庁The left and right extending portions N are each provided with a projecting portion 6 projecting inward in the left-right direction. Therefore, the back plate L is provided with a suitable structure in which the seat E can be covered.

The back plate L includes a body portion M forming a backrest surface and left and right extension portions N protruding downward from the body portion M. The left and right extension portions N are provided with backrest stops. A screw insertion hole 61 is formed as a fastener insertion hole through which the fastener v5 can be inserted. Therefore, the back plate L is provided with a suitable structure in which the back plate L can be screwed to the support frame B. As shown in FIG.

The back plate L includes a body portion M forming a backrest surface and left and right extension portions N protruding downward from the body portion M. The left and right extension portions N extend inward, respectively. A screw insertion hole 61 is formed in the projection 6 as a fastener insertion hole through which a screw v5 as a fastener for the backrest can be inserted. Therefore, the back plate L is provided with a suitable structure in which the seat E can be covered and the back plate L can be screwed to the support frame B. As shown in FIG.

In this chair A, a support frame B supports a seat E and a backrest F. A part of the seat E is arranged on a member constituting the backrest F, and the support frame After attaching the backrest F to B, the seat E is attached to the support frame B. Therefore, although the seat E engages with the backrest F, the seat E can be removed independently of the backrest F, and maintenance of the seat E having the upholstery 2 is possible. It has excellent characteristics.

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

The projecting portions provided on the left and right extending portions are not limited to those projecting inward.

The left and right leg elements that constitute the support frame are not limited to those shown in the above-described embodiments, and may be of any type as long as they can support the seat from below.

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

B... Support frame E... Seat F... Backrest L... Back plate v5... Screw (fastener for backrest)

Claims (1)

A chair in which a support frame supports a seat and a backrest,
The backrest has a back plate made of synthetic resin, and the back plate is fixed to the support frame with screws,
The back plate comprises a main body portion forming a backrest surface and left and right extending portions protruding downward from the main body portion,
The left and right extensions comprise an extension main body and projections protruding forward or leftward from the lower end of the extension main body, and the screws are attached to these projections. A screw insertion hole through which the screw can be inserted is formed,
The support frames are composed of a pair of left and right base frame portions extending in the front-rear direction, front leg frame portions erected at the front ends of the base frame portions, and erected rear end portions of the base frame portions. a rear leg frame portion, a side seat support frame portion installed between the upper end of the front leg frame portion and the upper end of the rear leg frame portion, and a front horizontal frame portion connecting the front end portions of the side seat support frame portion. a rear horizontal frame portion connecting the rear end portions of the side seat receiving frame portions; and a back support frame portion extending upward from the upper end of the rear leg frame portion,
the extension body is fitted onto the back support frame and supported by the support frame;
the protruding portion is fixed to the rear horizontal frame portion by the screw inserted through the screw insertion hole;
The seat includes a seat frame disposed on the side seat receiving frame portion, the front horizontal frame portion, and the rear horizontal frame portion, and an upholstery stretched within the seat frame. and
The chair, wherein the seat frame covers the screw and the protrusion, and the screw is invisible when viewed obliquely upward from the rear of the seat surface .

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