JP5490172B2 - Chair - Google Patents

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

However, when a large seat using a block, a link, or the like is positioned in the lower portion of the seat as described above, it is difficult to secure an arrangement place at an appropriate position when attaching an operation lever or the like to the seat. a problem that there Ru.

The present invention was made in view of such problems, the structure, is easy to arrange the operating lever or the like, is intended to provide a convenient chair new.

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

That is, the chair of the present invention includes a leg support at a position below the seat and supporting the seat, and the leg support has an operation part that forms a function of the chair at the upper end, and the upper end of the leg support and the seat. A space for detaching the cover covering the operating portion is formed between the seat support structure and the seat support structure for supporting the seat on the leg support sideward and gradually toward the front side and the rear side. And has a plurality of seat receiving frames formed extending in a direction away from each other , and through the space between the seat receiving frames below the seat, from any of the front, rear, left and right directions. It is configured to be accessible to fingers.

If comprised in this way, it will become easy to incorporate a mechanism component in the space between the upper end of a leg support | pillar, and a seat .

Furthermore, a leg column is provided at a position below the seat and supporting the seat, and the leg column has an operation part that constitutes a chair function at the upper end, and the leg column is disposed between the upper end of the leg column and the seat. A space for detaching the cover covering the operating part is formed, and the seat receiving structure for supporting the seat on the leg struts is taken out sideways and gradually upward from the leg struts toward the front side and the rear side. A plurality of seating frames are extended in a direction gradually separating from the leg struts , and are configured to be accessible from the front, rear, left, and right through the space between the seating frames below the seat. It is more preferable to be configured as described above.

In order to facilitate maintenance such as assembly of mechanical parts, a transparent or translucent area is provided in at least a part of the seat, and the cover is visible from above through these areas. It is preferable that

Furthermore, it is more preferable that a cavity into which a finger can be inserted is opened at the upper end of the leg column in a state where the cover is removed, and the operating portion is located in the cavity.

Further, the operating portion is disposed at a center portion of the plurality of seat receiving frames, and the seat is mounted on the seat receiving frames and fixed to the seat receiving frames by a detachable means. In addition, it is more preferable that the operating portion is exposed when the seat is separated from the seat receiving structure.

Furthermore, the seat is composed of a seat frame in which an opening is formed at the center and a mesh ground stretched inside the opening, and by fixing the seat frame to the tip of each seat receiving frame, It is more preferable that the front end portions of the seat frames are connected by a seat frame to form a frame structure that is three-dimensionally closed by these seat frames and the seat frame.

Since the present invention has the above-described configuration, it is possible to newly provide a chair that can effectively secure an operation lever or the like below the seat while maintaining the seat support function appropriately. .

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 bottom view which shows other embodiment of this invention. The right side view. FIG. The left side view. FIG. The figure which shows the modification of this invention. The figure which shows the modification of this invention.

  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 are gradually bent upward in a direction away from the center of the base plate 3 and are formed to extend in directions away from each other . In plan view, as shown in FIG. It extends. 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. 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. And naturally, the action | operation part 61 is arrange | positioned in the center part of the some seat frame 41, and the cover 32a for sealing the action | operation part 61 is also visually recognized in silhouette shape.

  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, the chair according to the present embodiment includes the leg support at a position below the seat and supporting the seat, and the leg support has an operation unit that configures the function of the chair at the upper end, and the leg support. A space in which the cover can be attached and detached is formed between the upper end of the seat and the seat, and the seat receiving structure for supporting the seat on the leg column has a plurality of seat receiving frames. It is configured such that fingers can be accessed from either front, back, left, or right with respect to the space through the seat frames .

Since it comprises in this way, it becomes possible to make it easy to incorporate the mechanism component which makes the action | operation part 61 in the space between the upper end of the leg support | pillar 3, and the seat 1. FIG.

In addition, the chair of the present embodiment includes a leg support 3 at a position below the seat 1 and supporting the seat 1, and the leg support 3 includes an operation unit 61 that constitutes the lifting mechanism 6 at the upper end. A space S in which the cover 32 a can be attached and detached is formed between the upper end of the leg support 3 and the seat 1, and a seat receiving structure 4 for supporting the seat 1 on the leg support 3 is gradually formed from the leg support 3. A plurality of seat receiving frames 41 to 41 are extended in a direction away from each other, and fingers can be accessed from either front, rear, left, or right with respect to the space S through the seat receiving frames 41 to 41 below the seat 1. Therefore, the above-described effects can be enhanced.

Moreover, since the mesh ground 13 part which is a part of the seat 1 is a semi-transparent area, and the cover 32a is visible from above through these areas, the above effect is further enhanced. Is possible.

In addition, with the cover 32a removed, a cavity 32b into which a finger can be inserted is opened at the upper end of the leg column 3, and the operating portion 61 is positioned in the cavity 32b. By removing the cover 32a, the seat 32 Since the space S between the upper end of the receiving structure 4 and the seat 1 is expanded by the amount of the cavity 32b, it is possible to more easily perform operations such as assembly and maintenance.

The operating portion 61 is disposed at the center of the seat receiving frames 41 to 41, and the seat 1 is mounted on the seat receiving frames 41 to 41 by screws V1 serving as detachable means. When the seat 1 is separated from the seat receiving structure 4 and the operating portion 61 is exposed, the cover 32a is removed by separating them. Therefore, the above work can be carried out more efficiently.

The seat 1 is composed of a seat frame 12 having an opening at the center and a mesh base 13 stretched inside the opening, and the seat frame 12 is fixed to the tips of the seat receiving frames 41 to 41. By doing so, the front end portions of the seat receiving frames 41 to 41 are connected to each other by the seat frame 12 so as to form a three-dimensionally closed frame structure by the seat receiving frames 41 to 41 and the seat frame 12. Therefore, it is possible to effectively realize a structure that facilitates work such as assembly and maintenance of the mechanical parts constituting the operating portion 61, and to narrow the seat frames 41 to 41 while ensuring strength. It is possible to secure a wider space for access.

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

For example, as shown in FIGS. 13 to 16, even if the three seat frames 41, 41, 141 are pulled out in a Y shape from the leg support 3 , the space is effectively reduced in the front lower side and the left and right lateral lower sides It can be ensured , and the same effect as described above can be obtained .

  The chair includes two front receiving frames 41 (x) extending radially forward in a plan view (or bottom view) and a lower surface of a central portion in the width direction behind the seat frame 12 extending radially rearward. And a seat receiving frame 141 to be supported, and the 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. 15, 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. 15 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. 13 and 14 is an operation portion for adjusting the 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.

  In this way, the operation lever 162 that also functions as adjustment and locking fixation / release of the elevating mechanism 6 is effectively arranged in the function adjustment space A2 located in the lower right of the seat 1 in the seated state. This makes it possible to effectively dispose the operating rod 262 for adjusting the locking reaction force in the function adjusting space A2.

  In addition, when the spine 2 has a lumbar support adjustment function, an operation unit is arranged in the function adjustment space A3 below the seat 1 or an appropriate operation unit is arranged in the function adjustment space A1 below the seat 1. Various forms of usage are possible.

  And since almost the whole picture of these operation parts is visually recognized through the mesh ground 13 provided in the seat 1 as shown in FIG. 17, the position and the number of the operation parts, and what kind of operation each is performed. This makes it possible to grasp whether the chair is not particularly conscious before sitting, and to effectively improve the usability of the chair.

  Since this embodiment has such a visual recognition function, if the seat 1 is assumed to be opaque, even if an operation unit is provided at a site that cannot be viewed unless it is looked from below, the same as above The effect of this can be obtained.

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

  For example, in the above embodiment, when the chair body A is supported by the seat receiving structure 4, the front end portion 7b of the armrest 7 is connected to the seat 1, and the front edge of the seat 1 extends forward of the front end portion 7b. In view of the above, the seat receiving structure 4 extends a plurality of seat receiving frames 41 from the center of the leg support 31 toward the lower surfaces of the four corners of the seat 1, and seats at the front ends of these seat receiving frames 41. 1 and the front two seat receiving frames 41 (x) are located in front of the front end portion 7b of the armrest 7, so that the front two seat receiving frames 41 ( As shown in FIG. 18, an appropriate operation portion K1 can be effectively attached in the vicinity of one or both extending ends of x). The operation portion K1 can be operated without being disturbed by the armrest 7 with only a slight forward bending, and visibility from above through the seat 1 can be secured, so that the operability is also improved. It becomes possible.

  Alternatively, in the above embodiment, the armrest 7 is connected to the back 2 with the rear end 7a entering the inner side in a plan view, and the seat receiving structure 4 is directed from the center of the leg support 31 to the lower surfaces of the four corners of the seat 1. Since a plurality of seat frames are extended and the lower surfaces of the seats are supported at the front ends of the seat frames, one or both of the rear two seat frames 41 (y) As shown in FIG. 18, an appropriate operation portion K2 can be effectively attached to a portion located below the rear end 7a of the seven. Then, if the body is tilted left and right so that the shoulder is slightly lowered in the sitting posture, the operation portion K2 can be operated without being obstructed by the rear end 7a of the armrest 7, and visibility from above through the seat 1 is possible. Therefore, the operability can be improved.

  And as these operation parts K1 and K2, the opening 410a is provided in the wall surface near the extension end of the seat receiving frame 41 so that it may illustrate in Fig.19 (a), and the seat receiving frame 41 is passed through this opening 410a. A lever 410b that can be swung up and down as an operation unit from the inside of the frame, and a lever that can slide up and down as an operation unit around the seat frame 41 as shown in FIG. The thing etc. with which 411a was externally fitted are mentioned. If wires or the like are connected to these levers 410b and 411a, various members for giving various functions to the chair such as a gas spring can be effectively remotely operated.

  Furthermore, 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.

DESCRIPTION OF SYMBOLS 1 ... Seat 1a, 1b ... Corner 31 ... Leg support 41 ... Seat receiving frame 62 ... Operation part (operation lever)
162 .. operation unit (operation rod)
A1-A3 ... Function adjustment space

Claims (6)

A leg column is provided at a position below the seat and supporting the seat, and the leg column has an operation unit constituting a chair function at the upper end, and the operation unit is disposed between the upper end of the leg column and the seat. Forms a space where the cover can be attached and detached,
A plurality of seat receiving frames in which a seat receiving structure for supporting the seat on the leg posts is formed so as to be taken out sideways and gradually upward from the leg posts toward the front side and the rear side and extend in directions away from each other. The chair is configured such that a finger can be accessed from either the front, rear, left, or right direction with respect to the space through the seat frame under the seat. A leg column is provided at a position below the seat and supporting the seat, and the leg column has an operation unit constituting a chair function at the upper end, and the operation unit is disposed between the upper end of the leg column and the seat. Forms a space where the cover can be attached and detached,
A seat receiving structure for supporting the seat on the leg struts is taken sideways and gradually upward from the leg struts to the front and rear sides, and a plurality of seat receiving frames are extended in a direction gradually separating from the leg struts. The chair is configured such that a finger can be accessed from any of the front, rear, left, and right directions with respect to the space through the seat frame under the seat. The chair according to claim 1 or 2, wherein a transparent or translucent region is provided in at least a part of the seat, and the cover is visible from above through the region. . 4. The cavity according to claim 1, wherein a cavity into which a finger can be inserted is opened at an upper end of the leg support in a state where the cover is removed, and an operating part is located in the cavity. Chair. The actuating portion is disposed at a center portion of the plurality of seat receiving frames, and the seat is mounted on the seat receiving frame and fixed to the seat receiving frame by a detachable means. The chair according to any one of claims 1 to 4, wherein the operating portion is exposed when the seat is separated from the receiving structure. The seat is composed of a seat frame having an opening at the center and a mesh ground stretched inside the opening, and the seat frame is fixed to the tip of each seat frame, so that the seat frame The chairs according to any one of claims 1 to 5, wherein the front end portions are connected by a seat frame to form a three-dimensionally closed frame structure by the seat frame and the seat frame.

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