JP7029045B2 - Chair - Google Patents

Description

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

Various chairs having a back plate that can support the back of a seated person have been conventionally known (see, for example, Patent Document 1).

The conventional back plate can cause elastic deformation when a seated person is loaded by reflecting a complicated structure. Therefore, it cannot be said that the conventional back plate has an excellent degree of freedom in design that can suitably support the back of the seated person while ensuring a predetermined strength.

Japanese Unexamined Patent Publication No. 2005-160558

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide at least a chair having a back plate that can suitably support the back of a seated person.

That is, the present invention has the following configuration.

The invention according to claim 1 is a chair provided with a back plate made of synthetic resin, wherein the back plate has a back plate main body having a plurality of holes penetrating in the front-rear direction, and the back plate thereof. It is provided with vertically extending vertical back support portions arranged on the left and right sides of the plate body, and the back plate main body connects the vertical back support portions between holes adjacent to each other in the vertical direction. It is provided with a horizontal band portion extending substantially linearly in the left-right direction, and the back plate main body is vertically oriented so as to connect between the upper and lower ends of the back plate main body between adjacent holes in the left-right direction. It is provided with a vertical band portion extending substantially linearly, and the horizontal band portion is arranged in a plurality of vertical directions in substantially the entire area excluding the upper and lower end portions of the back plate main body, and is described above. A chair in which a plurality of vertical band portions are arranged in the left-right direction only in the left-right end region of the back plate main body.

In the invention according to claim 2, the width dimension of the hole provided in the central region of the back plate main body is larger than the width dimension of the hole provided in the peripheral region located in the outer peripheral region of the central region. The chair according to claim 1 which has been set.

The invention according to claim 3 is the invention according to claim 2, wherein the size of the hole provided in the back plate main body is set so as to be gradually reduced from the central region toward the peripheral region side. It is a chair.

The invention according to claim 4 is provided on the back plate main body so that one hole and the other hole that are closest to each other in the vertical direction do not coincide with each other in the vertical direction. Or it is the chair described in 3.

The invention according to claim 5 is the chair according to claim 1, wherein the back plate main body is formed so that the thickness dimension gradually decreases toward the upper side.

The invention according to claim 6 is the chair according to claim 1, 2, 3, 4 or 5, wherein the hole has a substantially rectangular shape.

As described above, according to the present invention, it is possible to provide a chair having a back plate that can suitably support the back of a seated person.

The perspective view which shows one Embodiment of this invention. The perspective view in the same embodiment. 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. FIG. 3 is a sectional view taken along line XX in FIG. FIG. 8 is a partially enlarged cross-sectional view in FIG. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. The perspective view in the same embodiment. Bottom view in the same embodiment. Right side view in the same embodiment. An enlarged view for explaining the spacer in the same embodiment. The perspective view for demonstrating the spacer in the same embodiment. An exploded perspective view of the same embodiment. An exploded perspective view of the same embodiment. Front view of the backrest (back plate) in the same embodiment. FIG. 19 is an enlarged view of the Y portion.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 20.

In this embodiment, the present invention is applied to a chair A preferably used in an office, a conference room, an educational facility, or the like. As shown in FIGS. 14 to 16, this chair A is configured so that other chairs A having the same shape can be stacked in the vertical direction.

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

The support frame B has a base frame portion g1 that forms a pair on the left and right and extends in the front-rear direction substantially parallel to the floor surface, a front leg frame portion g2 erected at the front end portion of the base frame portion g1, and a base frame portion g1. The rear leg frame portion g3 erected at the rear end portion, the side seat receiving frame portion g4 erected 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 the side seat receiving frame portion. From the front horizontal frame portion H connecting the front end portions of the g4, the rear horizontal frame portion I which is the horizontal frame portion connecting the rear end portions of the side seat receiving frame portion g4, and the upper end portion of the rear leg frame portion g3. The outer back support frame portion J, which is the back support frame portion extended upward, and the inner back support frame extended upward along the outer back support frame portion J from the rear end portion of the side seat receiving frame portion g4. It is provided with a 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 receiving frame part g4, and the inner back support frame part K are made of one metal pipe in this order. It is continuously formed by wood. 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.

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

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 by a screw v1. A rear spacer D is attached to the lower surface of the rear end portion of the base frame portion g1 by a screw v2.

The distance between the front leg frame portions g2 arranged in pairs on the left and right is such that the rear legs are arranged in pairs on the left and right to enable stacking with other chairs 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 connected to the front end portion of the base frame portion g1 and extends inwardly and inclined inward in front view, and the lower front leg frame portion g21 and the lower front leg frame portion g21 substantially vertically upward from the upper end. It is provided with an extended upper front leg frame portion g22.

The side seat receiving frame portion g4 has a shape that can be attached to the lower surface of the side seat frame portion 11 in the seat E in order to support the seat E. The side seat receiving frame portion g4 has a gentle S-shape when viewed from the side. The side seat receiving frame portion g4 includes a first forward tilted frame portion g41, a backward tilted frame portion g42, and a second forward tilted frame portion g43 in this order from the front.

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

The front horizontal frame portion H is formed of a metal plate whose left-right intermediate portion is formed in an upward U-shape, and is fitted to the lower surface side of the front seat frame portion 12 of the seat frame 1 to be fitted to the front seat frame portion. 12 can be supported from below. The front horizontal frame portion H has a screw insertion hole h1 through which a screw v3 for fastening the seat frame 1 can be inserted in the vicinity of the left and right ends thereof. 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 portion 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 ends of the left and right side seat frame portions g4. The rear horizontal frame portion I has a shape curved so as to form a convex rearward in a plan view or a bottom view. The rear horizontal frame portion I has an upright frame portion i2 that is integrally erected from the rear end edge of the rear horizontal frame portion main body i1 that has upper and lower surfaces and is in a forward tilted posture and the rear horizontal frame portion main body i1. And have.

The rear horizontal frame portion main body i1 has a screw insertion hole i11 penetrating in the vertical direction through which a screw v4 for fastening the seat frame 1 can be inserted in the vicinity of the left and right ends thereof. The upright frame portion i2 has a screw insertion hole i22 penetrating in the front-rear direction through which a screw v5, which is a backrest fastener for fastening the back plate L, can be inserted in the vicinity of the left and right ends thereof. The screw insertion hole i22 of the upright frame portion i2 is provided in the convex portion i21 protruding upward in the vicinity of 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 portions of the side seat frame portion g4 by welding.

The front spacer C and the rear spacer D are for stably supporting the support frame B that supports the seat E and the backrest F with respect to the floor surface. The front spacer C and the rear spacer D are block-shaped formed of synthetic resin. The outer surfaces c3 and d3 of the front spacer C and the rear spacer D have a substantially trapezoidal shape in a side view and are formed flush with each other. 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 1.2 times or less the width dimension of the base frame portion g1.

The front spacer C has a floor contact surface c2 that can come into contact with the floor surface in the used state. The front spacer C is attached to the front portion of the base frame portion g1 in the support frame B by a screw v1. The front spacer C has a recessed portion c1 on the inner surface side of the front end portion thereof. The front spacer C is provided with a screw insertion hole c4 that penetrates in the vertical direction.

The floor contact surface c2 forms the lower surface of the front spacer C. The floor contact surface c2 is located in front of the main contact surface component c21 provided at the rear and the main contact surface component c21, and is an extension provided narrower than the main contact surface component c21. It is provided with a contact surface component c22.

The recessed portion c1 forms a storage space sp in which a part of the support frame B in the other chair A can be positioned at the time of stacking. The recessed portion c1 has a recessed portion forming surface c11 that is tilted forward in a side view. The recessed portion forming surface c11 can come into contact with a part of the lower end portion of the front leg frame portion g2 of another chair A having the same structure during stacking. 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 in the other chair A, and the chair A and the other chair during stacking. The position relative to A can be positioned.

The outer surface of the front spacer C is substantially rectangular, and the entire surface from the front end to the rear end is flat with no steps or recesses. The front spacer C is based on a rectangular parallelepiped as a whole, and has a recessed portion c1 extending from the inner surface side of the front end portion to the floor contact surface c2 within the range. When a plurality of chairs A having the same shape are stacked in the vertical direction, the front leg frame portion g2 of the lower chair A is positioned so as to fit into the recessed portion c1 of the front spacer C of the upper chair A. It has become. The front spacer C forms a rectangular parallelepiped along the stretching direction of the base frame portion g1. That is, since the front spacer C does not project greatly outward from the base frame g1, the entire chair A can be made compact.

Considering the stability of the support frame B (for example, the stability against tilting forward), it is preferable to attach the front spacer C to the front side of the support frame B as much as possible. Further, it is preferable that the distance between the front spacer C and the rear spacer D is as wide 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 portion g2 of the other chair A located below in the stacking state. Problems can occur. The front spacer C of this embodiment solves such a problem by forming a recessed portion c1 in a part of the inner surface side of the front end portion.

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

The seat frame 1 includes left and right side seat frame portions 11 extending in the front-rear direction, front seat frame portions 12 extending in the left-right direction connecting the front ends of the left and right side seat frame portions 11, and left and right side seat frame portions 11. It is provided with a rear seat frame portion 13 that connects the rear ends.

The left and right side seat frame portions 11 are supported from below by the side seat receiving frame portions g4 of the support frame B. The left and right side seat frame portions 11 have a gentle S-shape in 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 are connected to the first forward tilted portion 111, which is located at the front end portion and has a forward tilted posture in the side view, and the rear end of the first forward tilted portion 111. It is provided with a backward tilted portion 112 that is tilted backward in a lateral view, and a second forward tilted portion 113 that is connected from the rear end of the backward tilted portion 112 and is tilted forward in a lateral view.

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

Further, as shown in FIGS. 7 and 10, on the lower surface of the left and right side seat frame portions 11, a pulling member 11a having a substantially rectangular shape in the bottom view and a substantially L shape in the front view and the back view is screwed. It is attached by v6. The outer end of the pulling member 11a is engaged with the lower surface of the side seat frame portion g4, and the screw v6 is screwed to the left and right side seat frame portions 11 so that the left and right side seat frame portions 11 and the side seats are supported. It is designed to attract the frame portion g4.

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

The rear seat frame portion 13 is supported from below by the rear horizontal frame portion I. The rear seat frame portion 13 is provided with a hanging wall 131 projecting downward from the rear end edge. The left and right ends of the rear seat frame portion 13 are provided with notches 132 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 conceal the screw v5, which is a backrest fastener for fastening the back plate L to the rear horizontal frame portion I of the support frame B. That is, the rear seat frame portion 13 of the seat frame 1 in 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 the present embodiment, the rear seat frame portion 13 which is a part of the seat E is arranged so as to cover the protrusion portion 6 integrally formed with the back plate L of the backrest F. Then, the chair A attaches the seat E to the support frame B after attaching the back plate L 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 protrusion 6 that is a part of the back plate L, and a seat E that can hide the screw v5 that inserts the screw insertion hole 61 of the protrusion 6. Therefore, the seat E is such that only the seat E can be independently separated from the support frame B without removing the back plate L from the support frame B.

The upholstery 2 has a sheet shape stretched over the seat frame 1. The upholstery 2 is made of a flexible woven fabric and does not have shape retention by itself. The peripheral edge of the upholstery 2 is supported by the seat frame 1. In other words, the upholstery 2 is arranged in the area surrounded by the seat frame 1.

The upholstery 2 has a tension in the front-rear direction, that is, a tension in the left-right direction, that is, a force that pulls the left and right side seat frame portions 11 in a direction closer to each other than a force that pulls the front seat frame portion 12 and the rear seat frame portion 13 in the opposite direction. Is set to be stronger. More specifically, the upholstery 2 has 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 different elasticity characteristics from the wefts. Be prepared. In the upholstery 2, the elasticity characteristic of the weft is set higher than the elasticity characteristic of the warp.

The rear portion of the upholstery 2 forms a rear seating surface 23, which is an elastically deformable seating surface set to be gradually positioned upward toward the rear. The central portion in the front-rear direction of the upholstery 2 forms a central seating surface 22 which is an elastically deformable seating surface set to be gradually positioned downward toward the rear. The front part of the upholstery 2 forms an elastically deformable front seating surface 21 which is set to be gradually located on the upper side toward the rear.

That is, the front portion of the upholstery 2 supported between the first forward tilted 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. The center of the upholstery 2 supported between the backward tilted portions 112 in 11 constitutes the central seating surface 22, and is supported between the second forward tilted portions 113 in the side seat frame portion 11 of the seat frame 1. The rear part of the stretched ground 2 constitutes the rear seating surface 23. In FIG. 9, a thick line is shown so that the cross section of the upholstery 2 can be easily grasped.

The upholstery 2 supported by the seat frame 1 in this embodiment can take a so-called three-dimensionally raised form only by the upholstery 2. In other words, the upholstery 2 can take a three-dimensionally raised form without applying an external force by another member to a portion inside the peripheral edge thereof. That is, the entire upholstery 2 follows the shape of the side seat frame portion 11 that supports the upholstery 2 in the side view, and has an S-shaped undulation in the side view. In addition to this, by making the tensions in the front-rear direction and the left-right direction in the upholstery 2 different, the degree of S-shaped undulation in the central portion in the left-right direction of the upholstery 2 is closer to the side seat frame portion 11. It is set more gently than the degree of S-shaped undulations at the position.

The backrest F includes a back plate L formed of a synthetic resin.

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

The main body portion M includes a back plate main body 3 having a plurality of holes p penetrating in the front-rear direction, and vertically extending vertical back support portions 4 arranged on the left and right sides of the back plate main body 3. 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. The plurality of holes p formed in the back plate main body 3 have a substantially rectangular shape when viewed from the front. More specifically, the plurality of holes p have a substantially square shape in front view.

It should be noted that the "substantially square" in this specification includes those having four sides slightly curved so as to be convex outward or inward.

The back plate body 3 constitutes a main part that can support the back of the seated person. The back plate main body 3 is formed so that the thickness dimension gradually decreases toward the upper side. As shown in FIG. 20, the back plate main body 3 includes a horizontal band portion 31 that connects the vertical back support portions 4 between the holes p adjacent to each other in the vertical direction and extends substantially linearly in the left-right direction. .. A plurality of horizontal band portions 31 are arranged side by side in the vertical direction in substantially the entire area except for the upper and lower end portions 33 and 34 of the back plate main body 3.

In FIG. 20, for the convenience of grasping the horizontal band portion 31, a linear alternate long and short dash line is shown on the region corresponding to the horizontal band portion 31.

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

In FIG. 20, for the convenience of grasping the vertical band portion 32, a linear alternate long and short dash line is shown on the region corresponding to the vertical band portion 32.

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. It 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 arranged linearly in the left-right direction at substantially the same height position are provided on the back plate main body 3 so that the distance between the center points of the adjacent holes p increases toward the peripheral region 3c. ing. In other words, the pitch of the plurality of holes p arranged linearly in the left-right direction is set so as to increase from the central region 3b toward the peripheral region 3c. The virtual line ks connecting the center points of the plurality of holes p arranged linearly in the left-right direction is set to be parallel to the vertical direction and at substantially equal intervals in the front view.

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

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

The left and right extension portions N have a columnar appearance and have a columnar appearance, which is formed inside in the vertical direction and has an accommodation portion (not shown) in which the outer back support frame portion J and the inner back support frame portion K are accommodated. A projection 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 are provided.

The protruding portion 6 has a plate shape and projects from the lower end portion of the extending portion main body 5 along the back surface side of the standing frame portion i2 in the rear horizontal frame portion I. That is, the left and right protruding portions 6 are in the shape of protrusions. The left and right projecting portions 6 are formed with screw insertion holes 61, which are fastener insertion holes, penetrating in the front-rear direction through which the screw v5, which is a backrest fastener, can be inserted, in the central portion thereof.

The flange portion 7 is located 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 132 of the seat E. That is, the flange 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 externally fitted to the outer back support frame portion J in the upright posture and the inner back support frame portion K in the upright posture, and is supported by the support frame B. Further, the back plate L is screwed v5 with respect to the rear horizontal frame portion I extending in the left-right direction constituting the support frame B so as not to come off from the outer back support frame portion J and the inner back support frame portion K. Is stopped by. In this embodiment, the screw v5 is concealed 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 that the user can normally take. It is impossible. The chair A is easily visible from diagonally above, and it is necessary to pay attention to the appearance from diagonally above the rear in order to improve the appearance.

As described above, the chair A according to the present embodiment includes a back plate L formed of a synthetic resin. The back plate L is provided with a back plate main body 3 having a plurality of holes p penetrating in the front-rear direction, and vertically extending vertical back support portions 4 arranged on the left and right sides of the back plate main body 3. Become. The back plate main body 3 is provided with a horizontal band portion 31 that connects the vertical back support portions 4 between the holes p adjacent to each other in the vertical direction and extends substantially linearly in the left-right direction. Between the holes p adjacent to each other in the left-right direction, a vertical band portion 32 extending substantially linearly in the vertical direction is provided so as to connect the upper and lower end portions 33 and 34 of the back plate main body 3. A plurality of horizontal band portions 31 are arranged side by side in the vertical direction in substantially the entire area except for the upper and lower end portions 33 and 34 of the back plate main body 3, and the vertical band portion 32 is arranged in the back plate main body 3. A plurality of them are arranged side by side in the left-right direction only in the left-right end region 3a. Therefore, it is possible to provide the chair A having the back plate L that can suitably support the back of the seated person.

That is, in the case of the back plate L in the present embodiment, a configuration capable of elastic deformation is realized by forming a plurality of holes p having the same shape and adjusting the size and arrangement of the holes p. .. In other words, the back plate L of this embodiment has an excellent degree of freedom in design that can suitably support the back of the seated person by the mode in which the complexity of the structure is suppressed.

The width dimension of the hole p provided in the central region 3b of the back plate main body 3 is set to be 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. Therefore, the elastic deformability of the central region 3b, which easily comes into direct contact with the back of the seated person, and the air permeability in the front-rear direction can be suitably enhanced.

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. Therefore, not only the elastic deformability of the central region 3b, which easily comes into direct contact with the back of the seated person, and the air permeability in the front-rear direction can be suitably improved, but also the back plate L having an excellent appearance is provided. It is something to gain.

A plurality of holes p arranged linearly in the left-right direction at substantially the same height position are provided on the back plate main body 3 so that the distances between the center points of the adjacent holes p are substantially equal. Therefore, the arrangement of the holes p becomes regular, and the back plate L having an excellent appearance can be provided.

One hole p and the other hole p, which are closest to each other in the vertical direction, are provided on the back plate main body 3 so that the center points do not coincide with each other in the vertical direction. Therefore, the arrangement of the holes p in the vertical direction is not excessively simple and has a certain regularity, so that the back plate L having an excellent appearance can be provided. ..

The back plate main body 3 is formed so that the thickness dimension gradually decreases toward the upper side. Therefore, since the back plate L is easily elastically deformed toward the upper side, it can suitably support the back of the seated person.

Since the holes p have a substantially rectangular shape, it is possible to provide a back plate L having an excellent appearance.

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

The backrest may be provided with a back plate. In other words, the backrest may be provided with something other than the backboard. For example, the backrest may be provided with a cover covering the backboard together with the backboard.

The shape of the hole can be set to various shapes, and is not limited to the shape shown in the above-described embodiment. The shape of the hole may be, for example, a circular shape or an elliptical shape.

As the width dimension of the horizontal band portion and the width dimension of the vertical band portion, those having appropriate dimensions can be adopted, and are not limited to those shown in the above-described embodiment. Further, it goes without saying that the size of the left and right end regions in which the vertical band portions are arranged can be appropriately set.

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 ... Chair L ... Back plate p ... Hole 3 ... Back plate body 4 ... Vertical back support part 31 ... Horizontal band part 32 ... Vertical band part 33 ... Upper end part 34 ... Lower end part

Claims (6)

A chair with a backboard made of synthetic resin.
The back plate includes a back plate main body having a plurality of holes penetrating in the front-rear direction, and vertically extending vertical back support portions arranged on the left and right sides of the back plate main body.
The back plate main body is provided with a horizontal band portion that connects the vertical back support portions and extends substantially linearly in the left-right direction between holes adjacent to each other in the vertical direction.
The back plate main body is provided with a vertical band portion extending substantially linearly in the vertical direction so as to connect the upper and lower ends of the back plate main body between holes adjacent to each other in the left-right direction.
A plurality of the horizontal band portions are arranged side by side in the vertical direction in substantially the entire area excluding the upper and lower end portions of the back plate main body, and the vertical band portions are left and right end regions of the back plate main body. Chairs that are arranged side by side only in the left-right direction. The first aspect of claim 1, wherein the width dimension of the hole provided in the central region of the back plate body is set to be larger than the width dimension of the hole provided in the peripheral region region located in the outer peripheral region of the central region. Chair. The chair according to claim 2, wherein the size of the hole provided in the back plate main body is set so as to gradually decrease from the central region toward the peripheral region side. The chair according to claim 1, 2 or 3, wherein one hole and the other hole that are closest to each other in the vertical direction are provided on the back plate body so that the center points do not coincide with each other in the vertical direction. The chair according to claim 1, 2, 3 or 4, wherein the back plate body is formed so that the thickness dimension gradually decreases toward the upper side. The chair according to claim 1, 2, 3, 4 or 5, wherein the holes have a substantially rectangular shape.

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