JP2016106692A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair excellent in the degree of freedom for designing a back plate into a structure which easily warps in a thickness direction in accordance with the load of a seater.SOLUTION: A chair is constituted such that it can nest such another seat longitudinally as has the same structure while the seat being at a popped-up position. Said seat has a back plate forming a structure, in which a central part is more liable to warp in a thickness direction than a peripheral part. The back plate is covered on its lower face with a seat rear cover, and an intermediate part of said back plate and the intermediate part of said seat back cover are arranged at a spacing through a warping space for allowing the warpage of said back plate. While being at a use position, said seat is so positioned while being directly or indirectly supported substantially horizontally by said leg frame.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a chair suitably used for office work or school use.

  Conventionally, the seat can be pivoted between the use position and the flip-up position with respect to the leg frame, and in the state where the seat is in the flip-up position, the seat is nested in the front-rear direction with another chair having the same structure. A chair that is configured to obtain is known (see, for example, Patent Document 1).

  By the way, many seats in this type of chair are mainly composed of a seat plate, and in many cases, the back side of the seat plate is easy to touch the eyes of the user or the like at the flip-up position. For this reason, when examining a structure in which the seat is easily bent in the thickness direction, it must be designed on the assumption that the back side of the seat plate can be visually recognized by a user or the like. In other words, since the back side of the seat plate can be visually recognized by the user or the like in the conventional chair, the degree of freedom of design for making the seat plate flexible in the thickness direction according to the load of the seated person Was constrained.

JP 2012-90792 A

  The present invention has been made by paying attention to the above circumstances, and provides a chair having a high degree of freedom in design for making the seat plate bendable in the thickness direction according to the load of the seated person. It is in.

  That is, the present invention has the following configuration.

  The chair according to claim 1 is configured so that the seat can be rotated between the use position and the flip-up position with respect to the leg frame, and the chair is in the flip-up position, and the other chair having the same structure. The seat is configured to be capable of nesting in the front-rear direction, and the seat includes a seat plate having a structure in which the central portion is more flexible in the thickness direction than the peripheral portion, and the lower surface of the seat plate is the back of the seat The cover is covered, and at least an intermediate portion of the seat plate and an intermediate portion of the seat back cover are arranged apart from each other with a bending space for allowing the seat plate to bend, and the seat In the use position, the seat is directly or indirectly supported by the leg frame and positioned so as to be substantially horizontal.

  Here, the “seat plate” is not limited to a single member but is a concept including a member integrally formed by a plurality of members. The “seat plate” may be plate-like as a whole, and may be, for example, a sheet-like part.

According to a second aspect of the present invention, in the configuration according to the first aspect, at least the left and right lower surfaces of the seat plate are supported by left and right frames that are rotatable in the vertical direction with respect to the leg frame. The frame is directly or indirectly supported by the leg frame in a state where the seat is in the use position, and takes a substantially horizontal posture, and the left and right frames extend in the left-right direction, and the bending space of the seat plate is formed. It is connected by a curved or bent horizontal member so as to detour downward to form,
The left and right frames and the horizontal member are covered from below by the seat back cover.

  The chair according to claim 3 is the configuration according to claim 2, wherein in the state where the seat is in the use position, the horizontal member, the seat back cover, and the leg frame overlap in order from above, A space that allows the seat plate to bend downward when a load of a seated person is received is formed on the horizontal member.

  According to a fourth aspect of the present invention, in the configuration according to the second or third aspect, the seat back cover includes a positioning recess in which the horizontal member is disposed on the upper surface side.

  According to a fifth aspect of the present invention, in the configuration according to the first, second, third, or fourth aspect, the leg frame includes left and right front legs and a connecting member that connects the left and right front legs. The seat back cover is provided with protrusions before and after the connecting member.

  The chair according to claim 6 is the structure according to claim 1, 2, 3, 4 or 5, wherein the seat back cover is provided with a standing wall extending in the seat plate direction on an outer peripheral edge thereof, and the seat plate A wall-like rib projecting to extend in the direction of the seat back cover is formed on the periphery of the seat back plate, and the seat back cover is placed on the seat plate in a state where the standing wall is positioned outside the rib. Is attached to.

  According to a seventh aspect of the present invention, in the configuration according to the first, second, third, fourth, fifth or sixth aspect, the seat back cover is made of a synthetic resin.

  As described above, according to the present invention, it is possible to provide a chair having a high degree of design freedom for making the seat plate easily bent in the thickness direction in accordance with the load of the seated person.

The perspective view which shows one Embodiment of this invention. The front view in the embodiment. The right view in the same embodiment. The top view in the embodiment. The rear view in the embodiment. The bottom view in the embodiment. The right view which shows the stacking state in the same embodiment. AA line sectional view in FIG. The exploded perspective view in the embodiment. The bottom view for demonstrating a seat board. The top view for demonstrating a seat board.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In FIG. 11, the covering member 43 is omitted for convenience of description of the seat plate 42.

  In this embodiment, the present invention is applied to a chair C that can be nested in the front-rear direction, in other words, a chair C that can be stacked in the horizontal direction. As specifically shown in FIG. 7, the chair C is configured so that it can be nested in the front-rear direction with another chair C ′ having the same structure with the seat 4 held in the flip-up position (H). Is.

  In the chair C, the back frame 3 is supported by the leg frame 1 which is the chair body via the armrest 2 which is a support body, and the seat 4 is used in the use position (U) and the flip-up position (H) with respect to the leg frame 1. It is supported so that it can rotate between. That is, in a state where the seat 4 is in the use position (U), the seat 4 is directly supported by the leg frame 1 and positioned so as to be substantially horizontal.

  Hereinafter, the chair C will be described in detail.

  The leg frame 1 which is a chair body is mainly composed of a metal pipe material. The leg frame 1 includes left and right rear legs 11 having casters 111 at the lower ends, left and right front legs 12 having casters 121 at the lower ends and upper ends connected to the upper portions of the left and right rear legs 11, and the left and right front legs 12. A first horizontal member 13 that is a connecting member that connects the intermediate portions of the first horizontal member 13 and a second horizontal member 14 that connects the left and right front legs 12 at a position rearward of the first horizontal member 13. Prepare.

  The left and right rear legs 11 extend in the vertical direction in such a manner that the upper side is inclined forward so that the upper side is positioned in front of the lower side. It also serves as a support frame for the backrest 3. An armrest 2 formed integrally with the back plate 31 is attached to the upper end portion of the rear leg 11. The rear leg 11 is provided with an armrest connecting portion 112 which is a columnar core material having a small diameter at the upper end portion, and a mounting portion 23 of an armrest 2 described later is attached to the armrest connecting portion 112. . The total width, that is, the separation width of the left and right front legs 12 is narrower than the separation width of the rear legs 11. Moreover, the upper end part of the front leg 12 which is a part near the rear leg 11 has a shape curved from the inner side toward the outer side.

  The left and right front legs 12 extend in the vertical direction so that the upper side is positioned rearward of the lower side, and the first horizontal member 13 and the first horizontal member 13 are connected to the left and right front legs 12. Two horizontal members 14 are connected.

  The first horizontal member 13 is formed so as to have an upwardly convex shape when viewed from the front, and includes a horizontal portion 131 extending horizontally in the left-right direction at an intermediate portion in the left-right direction. The horizontal portion 131 is attached to the lower surface of the seat 4 in the use position (U), more specifically, the lower surface of the seat back cover 44 in the seat 4 in the use position (U). It is designed to be received from below.

  The second horizontal member 14 is disposed between the left and right ends and is configured between a pivotal portion 141 that constitutes a shaft portion that pivotally supports the seat 4 and the left and right pivotal portions 141 and is curved downward in a front view. And an intermediate portion 142 having the shape described above. The intermediate portion 142 is curved so as to protrude downward, and has an allowable bending space sp on which the seat plate 42 can be bent downward when a seated person receives a load. doing. Note that the front leg 11 may be provided with only the left and right pivots 141 and without the intermediate part 142. That is, the pivotal support part 141 may be provided with at least a part capable of rotating and supporting the seat 4 and may be divided into left and right parts and the left and right parts are not connected.

  Next, the armrest 2 as a support will be described.

  The armrest 2 supports the backrest 3 on the leg frame 1. That is, the armrest 2 has a main support in which the front end portion is supported on the upper portion of the rear leg 11 in the leg frame 1 via the mounting portion 23 extending in the vertical direction, and the rear end portion is connected to a protruding portion 312 of the back plate 31 described later. A member 21 and an auxiliary support member provided on the lower side of the main support member 21 so that the front end portion is supported by the leg frame 1 via the attachment portion 23 and the rear end portion is connected to the projecting portion 312. 22. In this embodiment, the armrest 2 and a back plate 31 to be described later are integrally formed of synthetic resin.

  The main support member 21 has an elbow rest surface 21s on the upper surface, and has a rectangular bar shape extending in the front-rear direction. The main support member 21 plays a role of supporting the back plate 31 in cooperation with the auxiliary support member 22. The front end portion of the main support member 21 is integrally connected to the upper portion of the attachment portion 23 attached to the rear leg 11. The rear end of the main support member 21 is integrally connected to the projecting portion 312 of the back plate 31. The main support member 21 has a posture inclined slightly forward from substantially horizontal so that the rear side is positioned higher than the front side in a side view. The front end portion 211 of the main support member 21 has a shape that protrudes forward from the front outer surface 23s of the mounting portion 23 toward the front, and has a shape that is easy for a seated person to put on.

  The auxiliary support member 22 has a rectangular bar shape extending in the front-rear direction, and plays a role of supporting the back plate 31 in cooperation with the main support member 21. The front end of the auxiliary support member 22 is integrally connected to the lower portion of the mounting portion 23. The rear end of the auxiliary support member 22 is integrally connected to the protruding portion 312 of the back plate 31. The auxiliary support member 22 is inclined forward such that the rear side of the main support member 21 is positioned higher than the front side in a side view.

  The main support member 21 and the auxiliary support member 22 are disposed at positions separated from each other, and are disposed in a manner that is not parallel in a side view. In other words, the armrest 2 has the main support member 21 and the auxiliary support member 22 arranged non-parallel. Further, the auxiliary support member 22 is formed thicker than the main support member 21 in a side view. That is, the main support member 21 provided with the elbow rest surface 21s is formed thinner than the auxiliary support member 22, so that a visually light atmosphere can be given to the viewer. The auxiliary support member 22 is provided so as to extend substantially perpendicular to the direction in which the upper end portion of the leg frame 1 extends. In other words, the auxiliary support member 22 extends in a direction substantially perpendicular to the front side surface and the rear side surface of the upper end portion of the rear leg 11.

  The attachment portion 23 is a cylindrical one that opens downward, and is externally fitted to the upper end portion of the rear leg 11 and is fixed to the rear leg 11 by a screw v1 inserted from the rear portion of the attachment portion 23. It has become. More specifically, the rear leg 11 is provided with an armrest connecting portion 112 that is a metal columnar core material at the upper end portion, and the attachment portion 23 is encased in the armrest connecting portion 112. In the state, it is fixed by the screw v1. The outer surface 11s of the rear leg 11 exposed to the outside and the outer surface 23s of the mounting portion 23 are set to be substantially flush with each other. Further, in the front view, the width dimension of the attachment portion 23 and the width dimension of the auxiliary support member 22 are set to be substantially the same dimension.

  Next, the backrest 3 will be described.

  The backrest 3 is mainly composed of a back plate 31 integrally formed of synthetic resin together with the armrest 2. The backrest 3 includes an overhanging portion 312 on the side edge. More specifically, the backrest 3 includes a back plate body 311 having a substantially rectangular shape in a front view, and an overhanging portion 312 that protrudes outward from an intermediate portion in the vertical direction at a side edge of the back plate body 311. I have.

  The back plate main body 311 is curved so as to be convex toward the rear in a plan view, and has a curved shape so as to be convex toward the front in a side view. A plurality of through-holes 311a penetrating in the front-rear direction are formed in an upper region that avoids a portion located between the portions. The back plate main body 311 has a groove mz that opens downward at the lower edge, and holds the end portion of the back cover when the back cover (not shown) is attached to the back plate main body 31. I can do it.

  The overhanging portion 312 is mainly composed of a piece-like portion projecting outward from the intermediate portion at both side edges of the back plate main body 311, and is provided at a height position corresponding to the waist of the seated person. The overhang portion 312 includes an upper region 312a, a lower region 312c, and a middle region 312b positioned between the upper region 312a and the lower region 312c. The rear end portion of the main support member 21 in the armrest 2 is connected to the upper region 312 a of the overhanging portion 312, and the rear end portion of the auxiliary support member 22 in the armrest 2 is connected to the lower region 312 c of the overhanging portion 312. It is connected continuously. The upper end surface 312s of the overhanging portion 312 has a gently curved surface, and is continuous with the elbow rest surface 21s of the main support member 21 in the armrest 2 at the front end portion, and at the rear end portion, the side end surface of the back plate main body 311. It is designed to be flush with 311s.

  Next, the seat 4 will be described.

  The seat 4 includes a seat support frame 41 composed mainly of a pipe material, a seat plate 42 disposed on the seat support frame 41, a covering member 43 covering the upper surface side of the seat plate 42, and the seat. A seat back cover 44 for covering the main part of the support frame 41 and the back side of the seat plate 42 from below is provided.

  The seat support frame 41 includes left and right side frame members 411a that are opposed to the left and right and that are rotatable in the vertical direction with respect to the leg frame 1. In this embodiment, the seat support frame 41 has a rectangular frame shape. . These left and right side frame members 411a are indirectly supported by the leg frame 1 via the shaft holding member w in a state where the seat 4 is in the use position (U) and assume a substantially horizontal posture. The seat support frame 41 includes an annular seat support frame main body 411 and a seat horizontal member 412 that is a horizontal member laid between the side frame members 411a of the seat support frame main body 411.

  The seat support frame main body 411 includes a side frame member 411a that supports the lower surface of the side portion of the seat plate 42 from below, a front frame member 411b that connects the front end portions of the side frame members 411a, and the side frame member 411a. A rear frame member 411c for connecting the rear ends is provided, and is configured in an annular shape using a metal round pipe material. That is, the seat support frame main body 411 is a pipe-shaped member having a curved surface at a portion corresponding to a deformation region x of the seat plate 42 described later. A shaft holding member w that is pivotably engaged with the pivotal support portion 141 of the second horizontal member 14 is provided on the rear portion of the side frame member 411a so as to protrude downward.

  The seat horizontal member 412 is formed of a flat pipe material, and has a shape that protrudes downward. In other words, the left and right side frame members 411a extend in the left-right direction and are bent or bent so as to bypass downward to form a bending space in which the seat plate 42 can be bent downward. It is connected by a seat horizontal member 412. A bending allowance space sp, which is a space that can allow the seat plate 42 to bend downward when a seated person receives a load, is formed on the seat horizontal member 412. The seat horizontal member 412 includes a horizontal portion 412a extending horizontally in the left-right direction at an intermediate portion in the left-right direction. The horizontal portion 412a is positioned right above the horizontal portion 131 of the first horizontal member 13 in the leg frame 1 through the seat back cover 44 with the seat 4 in the use position (U). Yes. In other words, the seat back cover 44 is sandwiched between the first horizontal member 13 of the leg frame 1 and the seat horizontal member 412 of the seat support frame 41 in a state where the seat 4 is in the use position (U). I am doing.

  The seat support frame 411 may have a shape that simply connects the left and right side frame members 411 a with the seat horizontal member 412. In other words, the seat support frame 411 may omit the front frame member 411b and the rear frame member 411c, and may have, for example, a substantially H shape in plan view.

  The seat plate 42 includes a seat plate main body 421 formed of a synthetic resin, and a mesh-like tension member 422 that is a pressure receiving member disposed in a central portion of the seat plate main body 421 in a plan view. The seat plate 42 has a structure in which the central portion is more easily bent in the thickness direction than the peripheral portion in plan view. In this embodiment, a tension member 422 serving as a pressure receiving member is disposed at the central portion, and a seat plate body 421 is disposed at the peripheral portion.

  The seat plate main body 421 has a shape in which a central portion in a plan view is opened. That is, the seat plate main body 421 includes a seat plate end edge portion 421a that engages with the seat support frame 41 and a window portion 421b that is positioned inside the seat plate end edge portion 421a.

  The seat plate edge 421a is arranged at a position overlapping the seat support frame main body 411 of the seat support frame 41 in a plan view and is downward along the outer surface of the seat support frame main body 411 when receiving a seated person's load. A deformation region x that can be elastically deformed, a frame engagement region y that is disposed outside the deformation region x and holds the seat support frame body 411, and an extension region z provided outside the frame engagement region y And. The deformation region x is provided at a position overlapping the seat support frame main body 411. In other words, the deformation region x is provided at a position on the intermediate portion in the width direction of the pipe material constituting the seat support portion frame main body 411. In this embodiment, the range closer to the outside of the deformation region x overlaps at least the range closer to the inside of the seat support portion frame body 411.

  The deformation region x is formed in an annular shape along the seat support frame body 411. The deformation region x has a structure that is easier to bend in the thickness direction than the other regions in the seat plate edge 421a. In this embodiment, the deformation region x includes a plurality of through-holes x1 formed at a predetermined interval, and a strip portion x2 is formed between adjacent through-holes x1. The band-like portion x2 is also located directly above the seat support frame main body 411 in plan view so that it follows the outer surface of the seat support frame main body 411 when a seated person's load acts on the central portion of the seat plate 42. Various deformations are triggered.

  The frame engagement region y includes a rib y1 that extends along the outside of the seat support frame body 411 and a plate-like portion y2 that forms a substantially horizontal plate shape to which the base end of the rib y1 is connected. The rib y1 is formed on the peripheral portion 421a of the seat plate 42, and has a wall shape projecting so as to extend in the direction of the seat back cover 44. In this embodiment, the rib y1 is provided along the outer side over the entire circumference of the annular seat support frame main body 411. That is, the rib y1 is erected downward at a substantially right angle from a plate-like portion y2 having a horizontal plate shape that forms a part of the upper surface of the seat plate. The frame engagement area y is provided with at least a L-shaped section in cross section by the plate-like part y2 and the rib y1, and is arranged so as to partially cover the upper side and the outer side of the seat support frame main body 411. And when it receives the load of the seated person, it can slide relative to the seat support frame body 411 and move relative to it.

  The extension region z is provided to extend outside the rib y1 in the frame engagement region y, and has a peripheral edge z1 of the seat plate 42. The extension region z is an annular, that is, a quadrangular frame portion constituted by a plate-like member, and is more rigid than the deformation region x.

  The seat plate 42 is attached to the seat support frame main body 411 with screws v2. More specifically, the seat plate 42 is attached to the seat support frame 41 by screwing the screw v2 that has passed through the rib y1 into the rear frame member 411c of the seat support frame 41. Since the seat plate 42 is arranged with the annular seat support frame main body 411 close to the inside of the rib y1, and is only screwed to the rear frame member 411c of the seat support frame 411 by the screw v2, the seat support frame The seat plate 42 can move relative to 411 when it receives the load of the seated person.

  The tension member 422 serving as a pressure receiving member is located at the center of the seat plate 42 in a plan view, and is placed on the window 421b of the seat plate main body 421 to receive a load from a seated person. The upholstery material 422 is easily bent downward when a seated person's load is received. In this embodiment, a mesh-like material is employed. The tension member 422 is fixed to the seat plate main body 421 by thermal welding. The seat plate 42 can be formed by various methods. For example, the tension member 422 that is a constituent part of the seat plate 42 may be put into a mold at the stage of forming the entire seat plate 42. Various materials can be applied as the upholstery material 422. In FIG. 10 and FIG. 11, for the sake of convenience of explanation, a material with a larger mesh is displayed so that it can be easily distinguished from other parts. ing.

  The covering member 43 covers the seat plate 42 from above, and includes a stretchable stretch 431 and a relatively thin cushion material 432 disposed below the stretchable fabric 431. . The covering member 43 plays a role of covering the upper surfaces of the seat plate main body 421 and the upholstery material 422 to adjust the appearance.

  The seat back cover 44 is a shell made of synthetic resin having a shape bulging downward, and covers the lower surface of the seat plate 42. In this embodiment, the seat back cover 44 covers the lower surface portion excluding the periphery of the seat plate 42, the seat support frame 41, and the intermediate portion 142 of the second horizontal member 14 in the leg frame 1 from below. It is. The seat back cover 44 includes an upright wall 442 extending in the direction of the seat plate 42 on the outer peripheral edge thereof. More specifically, the seat back cover 44 includes a seat back cover main body 441 that has a shape that bulges downward, and a standing wall 442 that is provided continuously at the periphery of the seat back cover main body 441. is there. The seat back cover 44 is arranged such that at least an intermediate portion thereof in plan view is separated from a corresponding intermediate portion of the seat plate 42. More specifically, the intermediate portion of the seat back cover 44 and the intermediate portion of the seat plate 42 are spaced apart with a bending space sp for allowing the seat plate 42 to bend in the thickness direction. Yes.

  The seat back cover main body 441 includes a positioning recess 441a in which the seat horizontal member 412 is disposed on the upper surface side in the middle portion in the front-rear direction, and a recess 441c for disposing the shaft holding member w on the left and right sides. Yes. Further, the seat back cover main body 441 includes a horizontal member abutting portion 441d on the lower surface side with which the first horizontal member 13 as a connecting member in the leg frame 1 can come into contact, and before and after the first horizontal member 13, that is, A protrusion 441b is arranged before and after the horizontal member abutting portion 441d.

  The seat back cover 44 is attached to the seat plate 42 by an appropriate method in a state where the upright wall 442 is positioned outside the rib y1 erected on the seat plate 42. As an example, a hook-like hook (not shown) protrudes upward on the standing wall 442 of the seat back cover 44, and this hook is provided at a corresponding position of the seat plate 42 and is not shown. The seat back cover 44 is attached to the seat plate 42 by engaging with the hole.

  In the state where the seat 4 described above is in the use position (U), the seat horizontal member 412, the seat back cover 44, and the first horizontal member 13 of the leg frame overlap in this order from the top. ing.

  As described above, in the chair C according to this embodiment, the seat 3 can be rotated between the use position (U) and the flip-up position (H) with respect to the leg frame 1, and the seat 4 is In the state in the flip-up position (H), it can be nested in the front-rear direction with another chair C ′ having the same structure. The seat 4 is provided with a seat plate 42 having a structure in which a tension member 422 that is a central portion is more flexible in the thickness direction than a peripheral portion, and the lower surface of the seat plate 42 is covered by a seat back cover 44. It has become a thing. The seat 4 is positioned so as to be substantially horizontal with the seat 4 being directly supported by the leg frame 1 in the state of use (U). The intermediate portion of the seat plate 42 and the intermediate portion of the seat back cover 44 are spaced apart from each other with a bending space sp for allowing the seat plate 42 to be bent. For this reason, the chair C excellent in the freedom degree of design for employ | adopting the structure in which the seat 4 is easy to bend in the thickness direction according to a seated person's load can be provided. That is, when various structures in which the central portion in the plan view of the seat 4 is bent more easily than the peripheral portion are applied to the seat plate 42, there is a concern about the appearance of the back surface side of the seat plate 42. Where there is a case. In the case of the chair C according to the present embodiment, even when the seat 4 is in the flip-up position (H), the seat back cover 44 covers various bending-inducing structures provided on the seat 4 from the back side. Therefore, the appearance can be improved. In other words, in the case of the chair C according to the present embodiment, by disposing the seat back cover 44 on the back side of the seat 4, the structure for inducing the bending of the central portion of the seat plate 42 has a problem in appearance. It can be applied without concern.

  At least the left and right lower surfaces of the seat plate 42 are supported by side frame members 411a that are left and right frames that can rotate in the vertical direction with respect to the leg frame 1. The left and right side frame members 411a are indirectly supported by the leg frame 1 in a state where the seat 4 is in the use position (U) and assume a substantially horizontal posture. The left and right side frame members 411a extend in the left-right direction and are connected by a seat horizontal member 412 that is curved or bent so as to bypass downward to form a bending space sp of the seat plate 42. The frame member 411a and the seat horizontal member 412 are covered by the seat back cover 44 from below. For this reason, between the left and right side frame members 411a, a structure in which the central portion of the seat plate 42 in a plan view can be easily bent according to the load of the seated person can be applied. That is, a bending space sp for realizing bending can be formed between the left and right side frame members 411a, and the left and right side frame members 411a are supported by the seat horizontal member 412 covered by the seat back cover 44. Therefore, it contributes to good appearance.

  In the state where the seat 4 is in the use position (U), the seat horizontal member 412, the seat back cover 44, and the leg frame 1 overlap in this order from above. A space sp that allows the seat plate 42 to bend downward when a load of a seated person is received is formed on the seat horizontal member 412. For this reason, the seat 4 having the seat plate 42 can be suitably supported by the leg frame 1, and the center portion of the seat plate 42 can bend downward when receiving a load of the seated person. Moreover, since the seat back cover 44 is sandwiched between the seat horizontal member 412 located on the upper side thereof and the first horizontal member 13 of the leg frame 1 located on the lower side of the seat back cover 44. The seat back cover 44 itself can provide a certain cushioning action without interposing a special cushioning material on the leg frame 1 side.

  The seat back cover 44 includes a positioning recess 441a in which the seat horizontal member 412 is disposed on the upper surface side. For this reason, the relative position between the seat lateral member 412 and the seat back cover 44 is less likely to change, which is preferable, and positioning is performed when the seat back cover 44 is fixed to the seat plate 42. It will be easy.

  The leg frame 1 includes left and right front legs 12 and a first horizontal member 13 as a connecting member for connecting the left and right front legs 12. The seat back cover 44 is provided with protrusions 441b before and after the first horizontal member 13. For this reason, even if a seated person's load acts with respect to the seat 4, the mutual position of the 1st horizontal member 13 and the seat back cover 44 will become difficult to shift | deviate, and it can give a seated person a sense of security It has become.

  The seat back cover 44 is provided with an upright wall 442 extending in the direction of the seat plate 42 on the outer peripheral edge thereof, and a wall-like shape projecting from the periphery of the seat plate 42 so as to extend in the direction of the seat back cover 44. Y1 ribs are formed. The seat back cover 44 is attached to the seat plate 42 with the standing wall 442 positioned outside the rib y1. For this reason, the appearance is also suitable, and an attachment structure in which the seat back cover 44 can be easily attached can be provided.

  Since the seat back cover 44 is made of synthetic resin, the degree of freedom for weight reduction is high. Moreover, a buffering action can be suitably achieved when contacting the first horizontal member 13.

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

  In the seat plate, various structures can be applied to the structure for making the central part easier to bend in the thickness direction than the peripheral part, and the structure is not limited to the above-described embodiment.

  The seat is not limited to being directly supported with respect to the leg frame, but may be indirectly supported.

  The left and right frames constituting the seat support frame may be directly supported by the leg frame, or may be indirectly supported.

  The deformation region of the seat plate may be of any structure as long as it has a structure that is easily bent in the thickness direction, and is not limited to that shown in the above-described embodiment. Various shapes can be adopted as the shape of the through hole, and the shape of the belt-shaped portion is formed in various shapes according to the shape. In addition, for example, the deformation region may be configured to be easily bent in the thickness direction by providing a plurality of round holes, or may be expanded and contracted by applying a rubber-like material. It may be configured to be easily bent in the thickness direction, or may be configured to be easily bent in the thickness direction by applying a net-like member. The seat plate may be a combination of those exemplified above and those shown in the above-described embodiments as appropriate. In other words, so-called various resin mesh-like members can be applied to the deformation region, mesh-like sheet bodies can also be applied, and members using other stretchable materials can be applied. It can also be done.

  The seat support frame only needs to include at least side frame members facing left and right, and is not limited to a ring or frame shape as shown in the above-described embodiment.

  In the embodiment described above, the seat plate is configured to include the seat plate main body and the pressure receiving member provided in the window portion of the seat plate main body, but is not limited to such a configuration. In other words, an appropriate configuration can be adopted as a configuration for inducing the bending of the central portion of the seat plate when receiving the load of the seated person. For example, the seat plate may be configured mainly with the seat plate body. In this case, in order to promote the elastic deformation of the central portion of the seat plate body when the seated person is seated, a belt-like shape formed by a perforated portion having various shapes called a so-called resin mesh and the plurality of perforated portions. It is preferable to apply one having a portion.

  It goes without saying that various tension materials can be applied to the pressure receiving member. For example, the pressure-receiving member does not necessarily need to be a stretchable mesh, and a sheet material having a relatively low stretch may be applied. If it does in this way, it will become a structure in which a seat board acts like what is called a trampoline shape, and the deformation | transformation area | region of a seat board main body can become a main body, and the cushioning property of a seat board can be provided.

  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.

DESCRIPTION OF SYMBOLS 1 ... Leg frame 4 ... Seat (U) ... Use position (H) ... Bounce-up position 42 ... Seat plate 44 ... Seat back cover sp ... Deflection space 412 ... Seat horizontal member (horizontal member)
441a ... Positioning recess 441b ... Projection 442 ... Standing wall y1 ... Rib

Claims (7)

The seat is pivotable between the use position and the flip-up position with respect to the leg frame so that the seat can be nested in the front-rear direction with another chair having the same structure in the state where the seat is in the flip-up position. A structured chair,
The seat includes a seat plate having a structure in which a central portion is more easily bent in a thickness direction than a peripheral portion, and a lower surface of the seat plate is covered with a seat back cover, and at least an intermediate portion of the seat plate And an intermediate portion of the seat back cover is spaced apart with a bending space for allowing the seat plate to bend,
A chair that is positioned so as to be substantially horizontal by being directly or indirectly supported by the leg frame in a state where the seat is in a use position. At least the left and right lower surfaces of the seat plate are supported by left and right frames that can rotate in the vertical direction with respect to the leg frame, and the left and right frames are directly attached to the leg frame with the seat in the use position. Or it is supported indirectly and takes a substantially horizontal posture,
The left and right frames extend in the left-right direction and are connected by horizontal or curved horizontal members so as to detour downward to form a bending space of the seat plate,
The chair according to claim 1, wherein the left and right frames and the horizontal member are covered from below by the seat back cover. In the state where the seat is in the use position, the horizontal member, the seat back cover, and the leg frame are overlapped in order from above, and when the seat member receives a load on the horizontal member The chair according to claim 2, wherein a space that allows the seat plate to bend downward is formed. The chair according to claim 2 or 3, wherein the seat back cover includes a positioning recess in which the horizontal member is arranged on an upper surface side. The leg frame includes left and right front legs and a connecting member that connects the left and right front legs.
The chair according to claim 1, 2, 3, or 4, wherein the seat back cover is provided with ridges before and after the connecting member. The seat back cover is provided with an upright wall extending in the seat plate direction on the outer peripheral edge thereof, and a wall-like rib projecting to extend in the seat back cover direction is formed on the periphery of the seat plate. Has been
The chair according to claim 1, 2, 3, 4, or 5, wherein the seat back cover is attached to the seat plate in a state where the standing wall is positioned outside the rib. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein the seat back cover is made of a synthetic resin.

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