JP2007260119A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable even a leg column type chair to effectively adopt an easily deflected seat by improving and especially designing a seat receiving part requisite for supporting the seatin to a leg column support. <P>SOLUTION: A seat receiving structure 4 is raised upwards from the leg column 3 so as to form a three-dimensional space S in the inside, the seat 1 is supported at the end of the seat receiving structure 4, and the seat 1 is deflected and sunk into the space S by receiving an upper load. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chair suitably used in an office or home.

For example, as shown in Patent Document 1 or the like, a chair of a type that supports a seat by a leg support forms a seat support using a block or a link at the upper end of the leg support, and supports the seat directly above the seat support. It is customary to do so.
Japanese Patent Application Laid-Open No. H8-10085

By the way, as a recent chair, a chair with an improved support feeling has been considered by providing an opening in the back and seat and stretching a tension fabric such as a mesh fabric to make it easier to bend. As for the type of chair, the structure which supports a seat frame with four fixed legs is common. That is, since the leg support type chair as in Patent Document 1 supports the center part of the back surface of the seat with the seat support, such a stretched structure cannot be generally adopted.

The present invention has been made paying attention to such a problem, and by providing an improvement to the seat receiving portion that is indispensable for supporting the seat on the leg column, such a leg column type chair is provided. The purpose is to make it possible to effectively employ a seat that is easily bent.

In order to achieve this object, the present invention takes the following measures.

  That is, the chair of the present invention starts up the seat receiving structure so as to create a three-dimensional space inside from the leg support, and each seat frame constituting the seat at the tip of the seat receiving structure. Both ends of the side are supported, and the seat is configured to sink into the space when the inside of the seat frame receives an overload and bends.

With this configuration, the seat structure that rises from the leg column and functions as a seat has a three-dimensional space inside, and the seat can sink into this space by bending, so the seat structure There is no interference with the body. And since it receives a load in the peripheral part of a seat, it becomes the structure which is easy to exhibit intensity | strength also with respect to the biased mounting load. Furthermore, since the seat receiving structure and the end of each side of the seat frame are in a closed state, it is possible to ensure the strength as a whole, and each part will not be deformed due to impact or weight when seated. .

In order to reduce costs and ensure a light appearance and strength, the seat structure is constructed by raising a number of seat frames toward the edges of the seat, It is desirable to form a frame structure that is three-dimensionally closed by the seat frame and the seat frame by connecting the frames in a substantially linear manner at each side of the seat frame.

In order to improve the strength of the seat frame efficiently, an enlarged diameter part is provided at the upper end of the leg strut, and the base end of the seat frame is pulled out sideways from this enlarged diameter part, and the inside of the enlarged diameter part is a mechanical part. What uses as a cavity which accommodates is suitable.

In a structure in which a seat is placed on the upper end of the seat frame and a screw inserted through a part of the seat frame is fastened to the seat, both securing of the screw tightening margin and securing of the seat bending margin are preferably achieved. For this purpose, a screw fastening portion is provided to hang down on the lower surface of the seat, and a screw insertion portion is provided at the tip of the seat receiving frame, and at least the dimension including the screw insertion portion and the screw fastening portion is sufficient for the space. It is effective to configure the depth.

In order to effectively and effectively secure the effective dimension of the screw insertion portion, it is desirable that the screw insertion portion is provided along the extending direction of the tip of the seat frame.

In this case, in order to appropriately secure the screw insertion / removal location, it is preferable that the screw insertion portion is opened downward at the intersection of the horizontal portion and the vertical portion constituting the seat frame.

As a preferred application example of the present invention, there is a seat in which a mesh ground is stretched on the opening of the seat frame, and the lower surface of the seat frame is supported on the tip of the seat structure.

Since the present invention has the configuration described above, it is possible to allow the seat to bend at a seat receiving portion that is indispensable for supporting the seat on the leg struts, and effectively configure a seat that is easy to bend using a mesh or the like. It becomes possible to do.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the chair according to this embodiment is configured such that a chair body A including a seat 1, a back 2 and an armrest 7 is supported by a seat receiving structure 4 raised from a leg B. It is.

  More specifically, the leg B is formed by supporting the leg strut 3 rotatably at the center of five leg blades 5 extending radially from an equiangular position and having a caster 5a at the tip. The column 3 has an enlarged base 32 at the upper end of the column main body 31, and a gas spring type lifting mechanism 6 as shown in FIG. 4 is incorporated inside the column main body 31 from the diameter expanded base 32. As shown in FIGS. 4 and 5, the enlarged base 32 has a bowl-shaped cavity 32b opened with the cover 32a removed, and ribs 32d extending radially from the vicinity of the center of the bottom wall 32c. There is an inner space above the rib 32d so that a finger can be inserted into the cavity 32b. The central portion houses an operating portion 61 that locks / unlocks the lifting mechanism 6 by a projecting and retracting operation, and an operating lever 62 serving as an operating portion is provided at a part of the enlarged diameter base portion 32 at a position for opening and closing the operating portion 61. It is pulled out in the radial direction through the notch 32x, and is pivotally mounted around the support shaft m so that it can be turned up and down. The cover 32a covers the cavity 32b including the operating portion 61 without interfering with the operation lever 62. The operating lever 62 lifts the operating element 61 by lifting it up to make the lifting mechanism 6 free, and protrudes by releasing the lifting operation to lock the lifting mechanism 6.

Then, four seat receiving frames 41 constituting the seat receiving structure 4 are raised from the leg support 3 upward, and the seat 1 is supported at the tips of the seat receiving structures 41. The seat frame 41 includes a horizontal portion 41a and a vertical portion 41b that are continuously formed by integral molding. The horizontal portion 41a has a base end connected to the side surface of the enlarged diameter base portion 32, and is pulled out sideways from the base end. 3, it is taken out while gradually curving upward in a direction that is gradually separated from the central portion of FIG. 3, and in a plan view, it extends radially from the leg column 3 as shown in FIG. The upper load on the seat 1 is applied to the rear of the center, and the leg support 3 is positioned correspondingly to the load, so the front two seats of the seat frames 41 extending from the leg support 3 to the four corners of the seat 1 are placed. The receiving frame 41 (x) is set longer than the rear two seat receiving frames 41 (y). The vertical portion 41b is smoothly connected to the horizontal portion 41a as shown in FIG. 4, and supports the edge of the seat 1 at the tip, specifically the lower surfaces 1a and 1b at the four corners as shown in FIG. Yes. As shown in FIG. 8, the vertical portion 41b is internally provided with a screw insertion portion 41c along the extending direction. The screw insertion portion 41c opens downward at the intersection of the horizontal portion 41a and the vertical portion 41b. ing. As shown in FIGS. 2 to 4, etc., the cross section of the seat frame 41 has a flat oval shape that allows an adult with an average physique to be clamped at any position along the extending direction. Yes.

Since the seat frame 41 extends radially toward the four corners of the seat 1 in this way, a portion located between the seat frames 41, 41 below the seat 1 shown in FIG. Specifically, regions A1, A2, and A3 having a substantially triangular shape in the bottom view, which are respectively positioned in the front lower side, the left and right horizontal lower sides, and the rear lower side of the seat 1, are open spaces that do not have a frame or the like. And this embodiment makes these function adjustment space which arranges an operation part (henceforth, the same numerals A1, A2, and A3 as the above-mentioned field are used), and the operation is carried out in function adjustment space A2 located in the lower right side when viewed from the seating position. A lever 62 is arranged.

On the other hand, the chair body A is composed of a seat 1, a back 2 and an armrest 7 as shown in FIGS. 1, 3 and 9, and is supported by the seat receiving structure 4 without using a back support rod. On the lower surface of the seat 1, screw fastening portions 11 formed by inserting nut members as shown in FIG. 7 and FIG. Then, the seat 1 is placed on the upper end of the seat receiving frame 41, and the screw V1 inserted from below into the screw insertion portion 41c of the seat receiving frame 41 is fastened to the screw fastening portion 11 provided in the seat 1, whereby the seat The seat 1 is attached to the receiving frame 41.

That is, this chair has a structure in which the front ends of the seat frames 41 constituting the seat structure 4 are firmly connected to each other on the sides of the seat frame 12 in a substantially straight line. 12 forms a three-dimensionally closed frame structure. As a result, even if each seat receiving frame 41 and seat frame 12 are formed relatively thin, the strength can be ensured as a whole, and each part will not be deformed by an impact or weight when seated.

As shown in FIG. 1 and FIG. 9 and the like, the seat 1 is configured by stretching a mesh ground 13 in an opening 12 a inside the seat frame 12, and the back 2 has a mesh ground 23 in the opening 22 a inside the back frame 22. A vertical rib provided at a position where the space between the seat frame 12 and the back frame 22 is reinforced is greatly pushed out so that it can be used as the elbow frame 71 to form an armrest 7. The back frame 22 and the elbow frame 71 are integrally molded with resin in a three-dimensionally connected state.

Specifically, as shown in FIGS. 1 and 2, the seat frame 12 has substantially the same width as the effective support portion 22 b and the seat frame 12 that warps upward from the lumbar corresponding portion 22 a that protrudes most forward in the back frame 22. The width of the back seat boundary portion X is set so that the buttock-corresponding portion 22c located in the deeper part of the back frame 22 is gradually narrowed downward as it goes downward from the lumbar-corresponding portion 22a of the back frame 22. Is set to be narrower than the effective support portion 22 b of the back frame 22 and the seat frame 12. Then, the rear end 71a of the elbow frame 71 is taken out from the back frame 22 to the front side, the front end 71b of the elbow frame 71 is taken out from the seat frame 12 to the upper side, and formed by the elbow frame 71, the seat frame 12 and the back frame 22. The resin is integrally molded so that the peripheral edge of the opening 7a is not within the two-dimensional plane and is curved three-dimensionally. That is, the opening 7a is visible not only from the side surface of FIG. 3, but also from the front surface of FIG. 2, and from the plane of FIG. 6 and the bottom surface of FIG. As shown in FIG. 8, the back seat boundary portion X has a U-shape that is forward-facing in the longitudinal section, and is continuous so as to form a three-dimensional shape while gently curving so that the longitudinal section is concave in a plan view along the buttock. is doing. A front hanging portion 15 is provided at the front end of the seat 1. The front hanging portion 15 is connected to the seat 1 so as to form an approximately inverted L-shape in the longitudinal sectional view shown in FIG. 4, and the longitudinal section thereof is along the front edge of the seat 1 as shown in FIG. It is continuous so as to form a three-dimensional shape while gently curving so as to have a forward protruding shape in a bottom view.

As shown in FIGS. 1 and 2, the rear end 71a of the elbow frame 71 is drawn from substantially the same height position as the lumbar corresponding portion 22a so that the fore edge is continuous with the fore edge of the back frame 22, and the back 2 is viewed in plan view. Since it is curved in a concave shape facing forward and the fore end of the back frame 22 faces the front side, the rear end 71a of the elbow frame 71 also moves forward while gently curving after being pulled out from the back frame 22 to the front side. It has a form to put out. Further, the front end 71b of the elbow frame 71 is pulled out so that the fore edge is continuous with the fore edge of the seat frame 12, and the seat frame 12 has a slightly upward concave shape when viewed from the front, and the fore edge is slightly above the horizontal. Therefore, the front end 71b of the elbow frame 71 also rises upward while being gently bent after being pulled out from the seat frame 12 slightly above the horizontal. The portion protruding from the back frame 22 and the portion rising from the seat frame 12 are both continuous to the upper end extending horizontally in the front-rear direction of the elbow frame 71. When viewed as ribs, these elbow frames 71 are longitudinal ribs with respect to the seat frame 12 and the back frame 22. The horizontal portion 71c is smoothly bent and connected to the upper end of the elbow frame 71.

The splitting direction of the mother die at the time of molding the chair body A is set to a direction of 45 degrees (see arrow Z in FIG. 3) that is substantially between the front-rear direction and the up-down direction.

Then, as shown in FIGS. 1 and 9, mesh grounds 13 and 23, which are separate members for forming a seating surface, are formed in the openings 12 a and 22 a existing inside the seat frame 12 and inside the back frame 22, respectively. It is fitted through the materials 14 and 24.

As shown in FIGS. 9 and 10, the opening edge of the back frame 22 is provided with a frame material attachment portion 122 having a frame material attachment surface 122a on the front surface and a groove 122b in which a plate-like body is fitted on the back surface. The mounting frame 120 including the mesh base 23 is fitted on the front surface of the frame material mounting portion 122, and the screw V2 inserted through the frame material mounting portion 122 of the back frame 22 from the back surface is fastened to the mounting frame 120, and the screw The decorative frame 121 is fitted into a position covering V2. The attachment frame 120 is formed with a fixed support surface 120a that is curved while gradually narrowing the opening width in a direction in which the mesh base 23 receives a load and bends.

Further, as shown in FIGS. 9 and 11, a frame material mounting portion 112 having a frame material mounting surface 112 a on the upper surface is provided at the opening edge of the seat frame 12, and a mesh is formed on the upper surface of the frame material mounting portion 112. The mounting frame 110 including the ground 13 is fitted, and the screw V3 inserted through the seat frame 12 from the lower surface is fastened to the mounting frame 110. The mounting frame 110 is formed with a fixed support surface 110a that is curved while gradually narrowing the opening width in a direction in which the mesh base 13 receives a load and bends.

The present embodiment forms the body of the chair shown in FIG. 1 as described above, and is screwed down from the vertical portion 41b of the seat frame 41 and the seat frame 12 shown in FIGS. The dimension d including the attachment portion 11 forms at least a three-dimensional space S between the upper end of the leg support 3 and the seat 1, and the seat 1 is bent as shown by a broken line in FIG. This can sink into the space S. At the same time, the space S is sized so that an operator can insert his / her fingers and attach and detach the cover 32a using a tool or the like as required, at least when no person is seated. In combination with the frame structure including the seat frame 41, the user can access the space S from any of the front, rear, left, and right directions to attach and detach the cover 32a, and perform maintenance of the internal operation unit 61 and the like. It can be done.

Further, in this chair, the seat receiving structure 4 positioned below the seat 1 has a plurality of seat receiving frames 41, and an operating portion 61 is arranged at the center thereof. Is only fixed to the seat receiving frame 41 by the screw V1, and if necessary, the screw V1 is removed to separate the seat 1 from the seat receiving structure 4 as shown in FIG. Further, if the cover 32a is removed, the operation unit 61 can be exposed to perform maintenance. Alternatively, since the seat 1 is fixed to each seat receiving frame 41 with screws V1 at four points as shown in FIG. 7, if only one screw V1 is left and the other screws V1 are removed, FIG. As shown in FIG. 8, the front ends of the seat receiving frames 41 are located at substantially the same height, and the seat 1 can be horizontally rotated with respect to the seat receiving structure 4. Can be issued. In this case, since the seat 1 is horizontally supported by the appropriate seat receiving frame 41 of the seat receiving structure 4 at the horizontally swiveled position, it is possible to perform maintenance work on the operating portion 61 and the like without being supported by hand. is there.

When such a chair is viewed from a visual point of view, the mesh base 13 stretched on the inside of the seat frame 12 forms a semi-transparent region, and is provided with a block-shaped seat, a shell, and the like below. Instead, as shown in FIG. 12, the seat frame 41 and the leg blades 5 constituting the seat structure 4 extend radially from the base portion as shown in a silhouette on the seat surface.

Thus, when the inside of the seat frame 12 is a semi-transparent region, when the operation unit is arranged in the function adjustment spaces A1 to A3 in FIG. 7, the entire outline is the position of the operation unit from above shown in FIG. It becomes visible with an overview of functions as well as numbers. In this embodiment, since the operating lever 62 of the lifting mechanism is only arranged in the function adjustment space A2 located in the lower right position in the seated state, the operating lever 62 is only one place at the time of taking off and seating. As described above, it is easy to be positioned in the lower right position in the seated state and to operate the gas spring type lifting mechanism 6 with the operation lever 62 extending radially from the upper end of the leg column 31. Is inferred. Also, if there are operation units in the other function adjustment spaces A1 and A3 shown in FIG. 7, they can be simultaneously recognized from the upper part of FIG. 12, so how many operation units are present, where they are located, It is possible to easily infer through the silhouette whether it is a function operation unit or what its operation method is.

As described above, according to the present embodiment, the seat receiving structure 4 is raised so as to create a three-dimensional space S in the upward direction from the leg support 3, and the seat 1 is placed at the tip of the seat receiving structure 4. The seat 1 is configured such that the inside of the seat frame 12 sinks into the space S when the seat frame 12 is bent by receiving an overload.

In other words, the conventional mesh conference chair does not rotate because it is supported by four fixed legs. In order to rotate, it is necessary to provide the leg support 3. However, since the chair provided with the leg support 3 supports the central part of the back of the seat with the seat support, generally such a stretched structure cannot be adopted. It was a thing. On the other hand, in the present embodiment, the seat structure 4 that rises from the leg column 3 and functions as a seat has a three-dimensional space S inside, and the seat 1 is bent to cause this space S. Since it can sink inside, it does not interfere with the seat receiving structure 4 without securing a bending margin between the seat receiving structure 4 and the seat 1. In addition, since the load is received at the peripheral edge of the seat 1, it is possible to provide a structure that easily exhibits strength against a biased load. Furthermore, since the seat receiving structure 4 and the end of each side of the seat frame 12 are in a closed state, the strength can be ensured as a whole, and each part can be deformed by an impact or weight when seated. Can also be effectively prevented.

The seat receiving structure 4 is a structure in which a large number of seat receiving frames 41 are raised toward the edge of the seat 1, and the front ends of the seat receiving frames 41 are substantially linear at each side of the seat frame 12. Since the frame structure is three-dimensionally closed by the seat frame 41 and the seat frame 12, the strength is effectively increased even in the thin seat frame 41 by supporting the seat frame 41 in a distributed manner. It can be secured. For this reason, it is possible to reduce the material used to construct the seat receiving frame 41, and it is possible to eliminate the heavy feeling below the seat 1 and obtain a light visual effect.

In particular, an enlarged base 32 is provided at the upper end of the leg support 3, the base end of the seat receiving frame 41 is pulled out from the enlarged base 32 to support the edge of the seat 1, and the inside of the enlarged base 32 is formed. Since it is used as a cavity 32b for accommodating a mechanical part such as the actuating body 61, it is possible to avoid an unnecessarily long length of the seat frame 41 and to ensure strength. It is also possible to effectively secure the storage location.

Further, when this chair is viewed from another viewpoint, the seat is placed on the upper end of the seat receiving frame 41, and the screw V1 inserted through a part of the seat receiving frame 41 is fastened to the seat 1. The screw fastening portion 11 is provided to hang down on the lower surface of the seat 1, and the screw insertion portion 41 c is provided at the tip of the seat receiving frame 41 so that at least the screw insertion portion 41 c and the screw fastening portion 11 are added. The depth of the space S is configured.

For this reason, even if the seat frame 12 itself or the seat receiving frame 41 itself is flat, it is possible to secure a fixing margin of the screw V1, and at the same time, to effectively form a space S that allows the seat 1 to bend. Can do.

In particular, since the screw insertion portion 41c is provided along the extending direction of the tip of the seat receiving frame 41, the cross section (thickness) of the seat receiving frame 41 even if the effective dimension of the screw insertion portion 41c is sufficiently long. Can be effectively avoided.

At this time, since the screw insertion portion 41c is opened downward at the intersection of the horizontal portion 41a and the vertical portion 41b constituting the seat frame 41, the screw insertion portion 41c in the vertical portion 41b is naturally formed at the intersection. It can be exposed to the outside and can be used as an insertion / removal opening for the screw V1, so that the screw V1 can be easily inserted and removed.

Since this embodiment is the above structures, even if it employ | adopts the mesh ground 13 with large bending for the seat 1, it becomes possible to use comfortably without trouble.

The specific configuration of each unit is not limited to the above-described embodiment.

For example, the structure for securing the margin of bending of the seat is not limited to the illustrated example, and the space S may be formed inside by using a box-shaped seat receiving structure 104 as shown in FIG. As shown in FIGS. 14 to 17, the space S may be configured by the three seat frames 41, 41, 141.

Explaining the latter, this chair has two front receiving frames 41 (x) extending radially forward in a plan view (or bottom view) and a width direction in the rear of the seat frame 12 extending radially rearward. And a seat receiving frame 141 that supports the lower surface of the central portion, and this seat receiving frame 141 also serves as a locking reaction force mechanism.

  In other words, the seat 1 of this chair is pivotally attached to the front two seat receiving frames 41 (x) via the front support shafts p at the front two corners, and the rear lower surface via the rear support shaft q. The seat 1 is pivotally attached to the seat frame 141. When the seated person falls on the back 2, the seat 1 rotates around the front support shaft p and the rear sinks.

  The seat receiving frame 141 that receives the gas spring 141a includes a gas spring 141a and a locking spring 141b that is arranged around the axis of the gas spring 141a and is compressed in conjunction with the compression operation of the gas spring 141a. As shown in FIG. 16, one end of the gas spring 141a is inserted into the enlarged diameter base 32 and supported by the retainer 141c together with the locking spring 141b. The operating portion 140x of the gas spring 141a is disposed at a position penetrating the retainer 141c, and in a normal state, the pressing element 162a provided at the inner end of the operation lever 162 is at a position where the operating element 140x can be pressed from the position of FIG. And the gas spring 141a is kept open. Then, by rotating the operation lever 162, the pressing element 162a can be moved away from the operating element 140x as shown in FIG. 16 and fixed at a required locking position. Of course, like the operation lever 62 of the above-described embodiment, the operation lever 162 is pulled up to immerse the operating element 61 to make the lifting mechanism 6 free, and by releasing the lifting operation, the operation lever 162 protrudes and is locked at the lifting position at that time. It also serves as a role.

  This chair is also provided with a locking reaction force adjusting mechanism. An operation rod 262 shown in FIGS. 14 and 15 is an operation portion for adjusting a reaction force by a rotating operation. A wedge member (not shown) provided in the enlarged diameter base portion 32 by rotating the operation rod 262 in FIG. By screw feeding in the direction perpendicular to the paper surface, the retainer 141c is moved in the compression direction or extension direction of the spring 141b, so that the reaction force can be increased or decreased.

  For this reason, an appropriate stopper (not shown) that prohibits a locking operation of a certain level or more is provided, and a predetermined space is provided between the upper end of the leg column 3 and the seat 1 while having a locking function. S can be secured.

Other configurations can be variously modified without departing from the spirit of the present invention.

For example, even if a transparent or translucent bearing surface is formed of acrylic or the like in place of the mesh ground, the same effects as described above are produced visually.

The perspective view which shows the chair which concerns on one Embodiment of this invention. The front view. The left side view. FIG. The perspective view which shows the internal structure of the enlarged diameter base part of the embodiment. The top view of the state which abbreviate | omitted the mesh ground of the chair which concerns on the embodiment, and removed the upper end cover of the leg support | pillar. The bottom view of the chair which concerns on the same embodiment. The exploded view of FIG. The disassembled perspective view of the chair main body which concerns on the same embodiment. Sectional drawing which shows the state by which the mesh place is engage | inserted by opening of a back frame. Sectional drawing which shows the state by which the mesh ground is engage | inserted by opening of the seat frame. The top view of the chair which concerns on the same embodiment. The figure which shows the modification of this invention. The bottom view which shows other embodiment of this invention. The right side view. FIG. The left side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat 4 ... Seat receiving structure 11 ... Screw fastening part 12 ... Seat frame 12a ... Opening 13 ... Mesh ground 31 ... Leg support 32 ... Expanded diameter part (expanded base)
32b ... hollow 41 ... seat frame 41a ... horizontal part 41b ... vertical part 41c ... screw insertion part d ... dimensions S ... space V1 ... screw

Claims (7)

From the leg struts upward, the seat structure is raised so as to create a three-dimensional space inside, and both ends of each side of the seat frame constituting the seat are supported at the tip of the seat structure, The seat is configured so that the inside of the seat frame sinks into the space by being bent by receiving an overload. The seat structure is a structure in which a large number of seat frames are raised toward the edge of the seat, and the tip portions of the seat frames are connected to each other on the sides of the seat frame in a substantially straight line. The chair according to claim 1, wherein the chair has a frame structure that is three-dimensionally closed by a frame and a seat frame. The enlarged diameter part is provided in the upper end of a leg support | pillar, the base end of a seat frame is pulled out sideways from this enlarged diameter part, and the inside of an enlarged diameter part is utilized as a cavity which accommodates a mechanism component. Chair. A seat is placed on the upper end of the seat receiving frame, and a screw inserted into a part of the seat receiving frame is fastened to the seat. The chair according to claim 2 or 3, wherein a screw insertion portion is provided at the tip of the receiving frame so as to be provided, and at least the dimension including the screw insertion portion and the screw fastening portion constitutes the depth of the space. The chair according to claim 4, wherein the screw insertion portion is provided along the extending direction of the tip of the seat frame. The chair according to claim 5, wherein a screw insertion portion is opened downward at a crossing portion of the horizontal portion and the vertical portion constituting the seat frame. The chair according to any one of claims 1 to 6, wherein the seat has a mesh ground on the opening of the seat frame, and the lower surface of the seat frame is supported at the tip of the seat receiving structure.

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