JP2022073407A - Chair structure and chair - Google Patents

Abstract

To enable a skin material to be attached with uniform tension even when an inner shell has a complexed curve shape.SOLUTION: In a chair seat 20, a cushion 22 is stacked on an inner shell 23, and is covered with a face fabric 21, and a peripheral edge 21a of the face fabric 21 is wound around to the rear side of the inner shell 23, and an engagement member 28 provided in the peripheral edge 21a of the face fabric 21 is fastened to the rear side of the inner shell 23, where the inner shell 23 includes a groove portion 23c accommodating the engagement member 28 on the rear side, and an engagement part 23d that regulates detachment of the engagement member 28 accommodated in the groove portion 23c by engaging with the engagement member 28 when the engagement member 28 attempts to be detached from the groove portion 23c. The engagement member 28 has flexibility along a bottom surface of the groove portion 23c of the inner shell 23, and is accommodated in the groove portion 23 along the shape of the inner shell 23.SELECTED DRAWING: Figure 13

Description

The present invention relates to chair structures such as seats and backrests and chairs. More specifically, the present invention relates to a chair structure and a chair that are useful in a structure in which the skin material is wrapped around to the back side of the inner shell and fastened.

Conventionally, in the structure of a chair such as a seat or a backrest, a cushion material made of urethane or the like is placed on a rigid inner shell, and the cushion material and the inner shell are wrapped with the skin material, and the skin material is covered on the back side of the inner shell. It is known that the peripheral edge of the chair is tightened by a string member (Patent Document 1). In this structure, the inner shell is generally flat, and when the peripheral edge of the skin material is tightened by the string member, it is performed in a substantially flat state along the inner shell, so that the force is evenly applied to each part of the peripheral edge of the skin material. Can be dispersed.

Japanese Unexamined Patent Publication No. 10-71057

However, in the invention described in Patent Document 1, when the inner shell has a complex curved surface shape, for example, the inner shell has a curved contour forming a gentle substantially S-shape when viewed from the side. Even if the peripheral edge of the skin material is tightened by the string member, the peripheral edge does not become flat, and it is difficult to evenly distribute the force to each part of the peripheral edge of the skin material. For this reason, the tension of the peripheral edge of the skin material changes depending on the position, which may cause the skin material to rise or wrinkle, or the skin material may easily come off from the inner shell.

It is an object of the present invention to provide a chair structure and a chair to which the tension of the skin material can be uniformly attached even if the inner shell has a composite curved surface shape.

In order to achieve such an object, the structure of the chair of the present invention is provided on the peripheral edge of the skin material by superimposing a cushioning material on the inner shell and covering it with the skin material and wrapping the peripheral edge of the skin material around the back side of the inner shell. In the structure of the chair in which the locking member is fastened to the back side of the inner shell, the inner shell has a groove portion for accommodating the locking member on the back side and when the locking member accommodated in the groove portion tries to come out of the groove portion. It has a locking portion that locks to the locking member and regulates it from coming out, and the locking member has flexibility along the bottom surface of the groove portion of the inner shell and follows the shape of the inner shell. It is designed to be housed in the groove.

Further, the structure of the chair of the present invention includes an outer shell that supports the inner shell from below, and the outer shell is arranged so as to face the locking member accommodated in the groove portion with a clearance. It is provided with a retaining portion for restricting the locking member from coming into contact with the locking member when the locking member accommodated in the groove is about to come out of the groove.

Further, in the structure of the chair of the present invention, it is preferable that the locking member has a flat plate shape and the surface thereof is accommodated in the groove portion along the bottom surface of the groove portion of the inner shell.

Further, in the structure of the chair of the present invention, it is preferable that the locking member is provided in a storage bag provided on the peripheral edge of the skin material.

Further, in the structure of the chair of the present invention, the structure is the seat of the chair, and the groove for accommodating the locking member is in the front-rear direction along the left and right edges of the back surface of the inner shell of the seat. It is preferable that it is formed so as to extend to.

Further, the chair of the present invention is provided with the structure according to any one of claims 1 to 5.

According to the structure of the chair of the present invention, the locking member provided on the peripheral edge of the skin material has flexibility along the bottom surface of the groove portion of the inner shell, and is accommodated in the groove portion along the shape of the inner shell. ing. Therefore, even if the shape of the inner shell has a complex curved surface shape, the locking member follows the shape of the inner shell, so that the tension of the skin material can be made uniform and attached. As a result, it is possible to suppress the floating and wrinkling of the skin material and to strengthen the fastening of the skin material to the inner shell. Further, since the locking portion is provided in the groove portion, it is possible to prevent the locking member from coming off when the skin material is pulled.

Further, according to the second aspect of the present invention, since the retaining portion is provided, it is possible to prevent the locking member from coming off when the skin material is pulled.

Further, according to the invention of claim 3, since the locking member has a flat plate shape and the surface is accommodated in the groove along the bottom surface of the groove of the inner shell, the shape of the inner shell of the locking member is changed. It is possible to improve the followability of the skin material and to make the tension of the skin material more uniform.

Further, according to the invention of claim 4, it is possible to prevent the locking member and the skin material from being separated from each other, and to firmly realize the fastening of the skin material.

Further, according to the chair of the present invention, since the tension of the skin material can be uniformly attached, it is possible to suppress the floating and wrinkles of the skin material and to strengthen the fastening of the skin material to the inner shell. be able to.

It is a perspective view which shows one Embodiment which applied the structure of the chair of this invention to the seat of a nesting chair. It is a perspective view which shows the upholstery, the cushion, and the inner shell transparently in the seat of the chair. It is a side view which shows the state which the seat of the chair is flipped up to the storage position. It is a perspective view seen from the front side with the seat of the chair flipped up to the storage position (the upholstery, the cushion, and the inner shell are shown transparently). It is a perspective view which shows the relationship between the leg of the chair, a seat, and a backrest when viewed from diagonally backward and lower. It is a perspective view which shows the protrusion of the front leg part, the seat support part, the rear leg part and the upper end part of the rear leg part of the leg frame of the chair. It is a perspective view which shows the seat frame, the inner shell, the cushion and the upholstery which make up the seat of the chair by disassembling. It is an enlarged perspective view of the part through which the rotation support shaft member of a disassembled inner shell and a seat frame penetrates. It is an enlarged perspective view of the through hole part of the seat frame of the chair. It is a plan view of the inner shell of the chair. It is a bottom view of the inner shell of the chair. It is sectional drawing which shows the state which the seat of the chair is cut along the line AA of FIG. FIG. 3 is a cross-sectional view showing a state in which the seat of the chair is cut along the line BB of FIG. It is an enlarged bottom view of the inner shell of the chair. It is a perspective view of the inner shell seen from above. It is a perspective view seen from the bottom by enlarging the periphery of the edge of the inner shell. It is a perspective view which looked at the cushion from the bottom.

Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

1 to 17 show an embodiment by giving an example of applying the chair structure according to the present invention to the seat of a nesting chair. In this specification, up and down, front and back, and left and right are defined based on the seated person sitting on the seat of the chair, and particularly on the basis of the time when the seat is in the horizontal posture. In addition, the horizontal posture of the seat includes the state where the seat surface is exactly horizontal and the state where the seat surface is approximately horizontal, and the vertical posture of the seat includes the state where the seat surface is exactly vertical. Includes a nearly vertical state.

The nesting chair according to this embodiment is capable of nesting in the front-rear direction with other chairs having the same structure while the seat is flipped up to the storage position, and is in a position where a substantially horizontal posture is maintained (seat position). It has a rotating structure that supports the seat with respect to the leg frame so as to rotate between the position (used position) and the position where the seat is flipped up and the almost vertical posture is maintained (the seat storage position).

As shown in FIGS. 1 to 5, the nesting chair 1 of the present embodiment is rotatably supported around the horizontal axis in the width direction with respect to the left and right leg frames 2 constituting the legs and each leg frame 2. It has a seat 20 and a backrest 7, and the seat 20 can be switched between a horizontal posture position and a vertical posture position.

In the case of the present embodiment, the legs are assembled by connecting the left and right leg frames 2 to each other by a seat 20 attached between them, a backrest 7, and a left and right leg connecting pipe 8 (FIGS. 4 and 4 and). See FIG. 5). That is, the left and right leg frames 2 are arranged so as to sandwich the seat 20 from the width direction. Each leg frame 2 includes a front leg portion 3, a rear leg portion 5, a seat support portion 4 that connects the front leg portion 3 and the rear leg portion 5 at their upper portions, and a lateral connecting portion 6, for example, an aluminum die. It is integrally molded by casting. Since the molding of the leg frame 2 by aluminum die-casting has a high degree of freedom in shape, it is possible to provide a leg frame having excellent design by reducing restrictions on the design of the leg frame. The leg frame 2 of the present embodiment is configured by aluminum die casting, but is not particularly limited to this, and one metal pipe such as a stainless steel pipe or an aluminum alloy pipe is bent. You may adopt a general leg frame that is assembled by welding things through the same type of metal plate, or in some cases, it has rigidity such as reinforced nylon containing glass fiber such as PA6-GF (polyamide 6). It may be molded with a rigid resin. Needless to say, the structure according to the present invention can be applied in any case.

The lateral connecting portion 6 is formed so as to project diagonally forward and inward from the inner side surface of the front leg portion 3, and is bent so as to face the mating leg frame 2 with the tip facing the left and right legs. A tip fitting portion 6a for fitting the connecting pipe 8 is formed (see FIG. 6). By fitting the left and right leg connecting pipes 8 into the tip fitting portion 6a of the horizontal connecting portion 6 and screwing them together, the front sides of the left and right leg frames 2 are connected to each other via the left and right leg connecting pipes 8. In the case of the present embodiment, the left and right leg connecting pipes 8 are, for example, square pipes, and are fitted with the square shaft-shaped tip fitting portion 6a of the horizontal connecting portion 6. Although not shown, a core material for reinforcement is housed in the left and right leg connecting pipes 8, and both ends of the core material are connected to the tip fitting portion 6a of the horizontal connecting portion 6 to connect the left and right sides. The leg connecting pipe 8 is provided so as to increase the rigidity of the leg connecting pipe 8 and particularly to increase the rigidity in the vertical direction to prevent bending.

Further, as shown in FIG. 3, the horizontal connecting portion 6 and the left and right leg connecting pipes 8 are arranged at positions in front of the rotating support shaft member 11 which is an example of the rotating member fixed to the seat support portion 4. It suffices if the cross rail portion 25 of the seat frame 24 can be received and supported on the front side of the rotation support shaft member 11, but at the same time, the left and right legs when the seat 20 is flipped up to the seat storage position and put into a vertical posture. Since it remains between the frames 2, it is preferable to provide it at a position as close to the rotation support shaft member 11 as possible in order to improve nesting efficiency. Therefore, in the case of the present embodiment, as shown in FIGS. 2 and 5, for example, in a state where the seat 20 is tilted down and placed in a horizontal posture, the tip of the seat frame 24 is from a position where the rotation support shaft member 11 penetrates. The horizontal connecting portion 6 and the left and right leg connecting pipes 8 are provided so as to be arranged in the middle between the edges.

As shown in FIG. 6, at the intermediate position in the front-rear direction of the seat support portion 4, a rotation support shaft member projecting in the left-right direction toward the seat support portion 4 on the opposite side to each other, that is, toward the inside of the chair 1. A screw hole 35 for fixing the 11 is provided. Further, a boss portion 36 is formed on the surface on which the rotation support shaft member 11 is screwed, and a counterbore hole 37 serving as an entrance portion of the screw hole 35 is provided.

As shown in FIG. 2, a rear damper 33 is provided on the inner surface of the rear leg portion 5 (the surfaces of the rear leg portions 5 of the left and right leg frames 2 facing each other). The rear damper 33 is, for example, a resin block, and is attached to the rear leg portion 5 by, for example, screwing or adhering. Further, a front damper 34 is provided at the corner portion of the left and right connecting portions 6 of the front leg portions 3. The front damper 34 is, for example, a resin block, and is attached to the corner portion of the left and right connecting portions 6 by, for example, screwing or adhering. As a result, when the seat 20 is flipped up and nested in the front-rear direction with another chair having the same structure, the corner portion of the left-right connecting portion 6 of the rear leg portion 5 and the front leg portion 3 comes into direct contact with each other. By preventing it, it is possible to mitigate the sound at the time of impact or collision.

Here, the leg frame 2 of the present embodiment is formed so that the seat support portion 4 and the front leg portion 3 are gradually offset inward toward the tip side with respect to the rear leg portion 5, and the left and right leg frames 2 are formed. In the assembled state, the outer leg width of the front leg 2 (outer spacing between the left and right front legs 3) is larger than the inner leg width of the rear legs 5 (inner spacing between the left and right rear legs 5). It is configured to be narrow. As a result, when a plurality of chairs 1 are arranged in the front-rear direction, the left and right front leg portions 3 and 3 of the other rear chairs enter between the left and right rear leg portions 5 and 5 of the front chair, and nesting is possible. It has a leg structure. In the present embodiment, the casters 38 are attached to the lower ends of the front legs 3 and the rear legs 5, but it is not essential in the present invention to provide the casters 38.

The backrest 7 is a resin molded product in which a tubular mounting portion (receptacle) 7c is integrally molded at the lower ends of the back frame 7a, the backrest surface 7b, and both side portions of the back frame 7a by injection molding, and is viewed in a plan view. In the left-right direction, the middle portion bends backward and curves, and in the side view, the portion slightly below the center in the vertical direction is formed so as to be convex forward. A large number of small holes 7d penetrating in the front-rear direction are formed on the backrest surface 7b.

As shown in FIG. 6, the backrest 7 is attached to the leg frame 2, for example, by fitting the attachment portion 7c at the lower end of the back frame to the protrusion 5a that tapers toward the upper end of the rear leg portion 5. To. That is, the cylindrical mounting portion (receptacle) 7c of the backrest 7 and the protruding portion 5a at the upper end of the rear leg portion 5 form an inro joint, and in a fitted state, for example, by screwing each other. Is fixed to.

As shown in FIG. 7, for example, the seat 20 has an upholstery 21 which is an example of a skin material forming a seat surface, a cushion 22 which is an example of a cushioning material which supports the upholstery 21, and the cushion 22. The inner shell 23 is composed of an inner shell 23 that supports the inner shell 23 and a seat frame 24 that is an example of an outer shell that supports and reinforces the inner shell 23 from below. The peripheral edge of the overlay 21 is sandwiched between the seat frame 24 and the inner shell 23, and the seat frame 24 and the inner shell 23 are overlapped and screwed together. The detailed configuration of the seat 20 will be described later. In the present embodiment, the mechanical strength of the seat 20 as a structure is mainly secured by the seat frame 24.

Further, a bow-shaped cross rail portion 25 projecting toward the floor is provided at substantially the center of both the left and right sides of the seat frame 24. The cross rail portion 25 is provided so as to abut on the left and right leg connecting pipes 8 fitted between the lateral connecting portions 6 of the legs and to support the entire seat frame 24.

Further, as shown in FIG. 5, an elastic cushioning pad 26 is provided at a portion of the cross rail portion 25 that crosses substantially the center of the seat frame 24 and abuts on the left and right leg connecting pipes 8. The cushioning pad 26 has, for example, a plate-shaped contact portion and a locking pin (not shown) press-fitted into a hole (not shown) provided in the cross rail portion 25, for example, the cross rail portion. One is arranged on each of the left and right sides of 25. The buffer pad 26 abuts on the left and right leg connecting pipes 8 on the leg side when the seat 20 is tilted to the position of use, thereby preventing the generation of collision noise and providing a buffering action, and the seat 20 has a horizontal posture suitable for sitting. Keep it at a height that makes it. The seat 20 takes a horizontal posture when the cross rail portion 25 comes into contact with the left and right leg connecting pipes 8 of the legs, and the horizontal posture is maintained.

Further, as shown in FIGS. 8 and 9, for example, the seat frame 24 has a through hole 39 for attaching the rotation support shaft member 11 in the width direction at a position closer to the rear than the intermediate position in the front-rear direction. It is provided symmetrically on one axis. As an example, as shown in FIG. 3, the through hole 39 is closer to the rear end side than the center of the seat frame 24, and the rotation support shaft member 11 is taken in a vertical posture by flipping up the seat frame 24. The rotation support shaft member 11 is provided at a position where the center of gravity position G is set on the rear side (backrest 7 side) of the vertical straight line Lv passing through the rotation shaft portion 14. As a result, when the seat 20 is flipped up around the rotating shaft portion 14 of the rotating structure and takes a vertical posture, the seat 20 leans against the backrest 7 or due to the frictional resistance given by the frictional resistance imparting member 15. , The vertical posture is maintained. Further, as shown in FIG. 9, a counterbore hole 30 for accommodating the head portion 13 of the rotation support shaft member 11 is provided at the entrance of the through hole 39, and the friction resistance imparting member 15 is prevented from rotating. A structure, such as a recess 31, is provided. Then, the rotation support shaft member 11 is inserted into these through holes 39, and the screw 12 at the tip thereof is screwed into the screw hole 35 (see FIG. 6) of the seat support portion 4, whereby the leg frame 2 and the seat are seated. The frame 24 is rotatably connected to the frame 24.

The seat 20 and the leg frame 2 of the nesting chair configured as described above are rotatably connected on one horizontal axis via a rotating structure, and are rotatably connected to each other in a horizontal posture (position used as the seat 20) and a vertical posture (position used as the seat 20). It is attached to the leg frame 2 so as to rotate between the seat 20 and the seat 20 which is flipped up along the backrest 7 and stands up.

Next, the configuration of the seat 20 will be described in detail with reference to FIGS. 7, 10 to 14. The seat 20 is placed by stacking the cushion 22 on the inner shell 23 in the stacking direction (vertical direction), covering the overlay 21, and wrapping the peripheral edge of the overlay 21 around the back side of the inner shell 23 to fasten the seat 20. , Formed by assembling the seat frame 24 from the back side of the inner shell 23. As a result, the peripheral edge 21a of the overlay 21 is fastened to the inner shell 23, and is covered and hidden by the seat frame 24. Further, the seat 20 is integrated as one structure by superimposing the seat frame 24 and the inner shell 23 and screwing them together.

As shown in FIG. 15, the inner shell 23 of the present embodiment supports the buttocks on the posterior side as compared with the thigh support site side that supports the thighs of the seated person on the anterior side in order to facilitate guidance to the ischial sitting position. The seating side has a concave shape. In other words, the seated part of the seat forms a concave surface that wraps around the buttocks of the seated person according to the shape of the buttocks, and the front of the seated part also rises to prevent the buttocks of the seated person from slipping forward. There is. The front end of the seat hangs forward so as not to hit the thigh of the seated person. Further, the peripheral portion of the inner shell 23 is raised so as to wrap around the buttocks and the thigh. Therefore, when viewed from the side surface, the inner shell 23 has a complex curved shape in which the front end side hangs down, the rear end slightly rises, and the inner shell 23 sinks toward the vicinity of the buttocks and rises again on the rear end side, that is, a gentle abbreviation S. It has a shape that forms a character shape (hereinafter referred to as a spline shape). Similarly, the seat frame (outer shell) 24 that supports the inner shell 23 from below also has the same front, rear, left, and right frame shapes as the edge portion of the inner shell 23. Therefore, when viewed from the side, a complex curved shape in which the front end side hangs down and the rear end side rises slightly and then sinks toward the buttocks and then rises again on the rear end side, that is, a gentle substantially S-shaped shape. (Hereinafter referred to as a spline shape) (see FIG. 2).
It is piled up.

The inner shell 23 and the seat frame 24 are, for example, resin molded products having the rigidity required as a constituent member of the seat 20. By using the resin molded product for the inner shell 23 and the seat frame 24 in this way, it is possible to form an arbitrary shape such as a spline shape while having rigidity, and the designability can be improved. Moreover, since the inner shell 23 and the seat frame 24 can be formed by injection molding, the cost of parts can be reduced as compared with the case of additional machining. The inner shell 23 and the seat frame 24 have a rib shape that is combined with each other at the joint. Further, in FIG. 8, a U-shaped groove 23a surrounding the boss portion 32 of the through hole 39 is formed on the peripheral edge of the inner shell 23 overlapping the portion through which the rotation support shaft member 11 of the seat frame 24 penetrates, and is overlapped without a gap. Has been done.

In the present embodiment, as shown in FIGS. 10, 12 to 15, and 16, the inner shell 23 has a flange-shaped extending portion 27 protruding outward from the side portion. The extending portion 27 is provided on the side portion and the rear portion in the width direction of the seat 20. As shown in FIG. 12, in the present embodiment, the cushion 22 is provided so that the peripheral edge portion 22a abuts on the extending portion 27 in the vertical direction. That is, in the present embodiment, the peripheral edge portion 22a of the cushion 22 and the extending portion 27 are provided so as to be in contact with each other over the entire area without a gap. Therefore, the peripheral edge portion 22a of the cushion 22 does not wrap around below the extending portion 27, and the cushion 22 can be less likely to be crushed as compared with the case where the cushion 22 wraps around the back side of the inner shell 23. As a result, the peripheral edge portion 22a of the cushion 22 can be easily made into a flat shape by utilizing the outer peripheral surface 27a of the extending portion 27, so that the appearance of the seat 20 can be improved (see FIG. 17). Further, in the portion where the cushion 22 abuts on the extending portion 27, the outer surface 22b of the cushion 22 is located on the same plane as the outer surface 27a of the extending portion 27, that is, flush with each other. Therefore, it is easy to shape the outer peripheral surface of the seat 20 into a flat shape.

Further, since the peripheral edge portion 22a of the cushion 22 abuts on the extending portion 27, even if the overlay portion 21 presses the cushion 22 from the outside to the inside, the extending portion 27 acts as a guard to prevent the cushion 22 from losing its shape. , It is possible to prevent the cushion 22 from being partially recessed from the extending portion 27. Therefore, the crushing of the cushion material is suppressed, wrinkles of the skin material are less likely to occur, and the sharp shape of the extending portion 27 can be utilized to improve the stability of the appearance of the seat 20.

Here, when the inner shell 23 is not provided with the extending portion 27, the peripheral edge portion of the cushion 22 is formed long downward so as to wrap around to the back side of the inner shell 23, for example. At this time, when the cushion 22 is formed of urethane foam, if an attempt is made to form the cushion 22 long while gradually thinning the peripheral portion so as to eliminate the step, the tip of the edge does not have a uniform length or thickness and forms a corrugated shape. , When wrapped in the overlay material 21, unevenness is likely to occur. On the other hand, in the present embodiment, as shown in FIG. 12, the cushion 22 can be foamed so that the peripheral edge portion 22a of the cushion material 22 has a thickness corresponding to the overhanging amount of the extending portion 27 up to the edge portion. Therefore, the edge shape can be formed into a sharp shape without unevenness. That is, the peripheral edge portion 22a can be formed to have a uniform length and thickness until it reaches the extending portion 27. Therefore, the outer peripheral surface of the seat 20 can be easily made into a flat shape.

Since the outer peripheral surface of the side portion of the seat 20 is flat, the leg frame 2 is moved to the leg frame 2 when the seat 20 is rotated even if the clearance with respect to the leg frame 2 is set narrower than when the side portion of the seat 20 is uneven. The interference between the seat 20 and the leg frame 2 can be appropriately reduced. Therefore, it is not necessary to form the chair with a margin more than necessary, and the chair 1 can be miniaturized while securing the area of the seat 20.

In the present embodiment, the case where the peripheral edge portion 22a of the cushion 22 and the extending portion 27 are provided in contact with each other without a gap over the entire area has been described, but the present invention is not limited to this. .. For example, the peripheral edge portion 22a of the cushion 22 and the extending portion 27 may not be in contact with each other without a gap over the entire area, or may have a gap in a part between the two. Alternatively, the peripheral edge portion 22a and the extending portion 27 of the cushion 22 may be provided with a gap over the entire area. That is, the cushion 22 may be provided with the peripheral edge portion 22a facing the extending portion 27 in the vertical direction. With this configuration, as described above, the peripheral edge portion 22a of the cushion 22 can be easily formed into a flat shape by utilizing the outer peripheral surface 27a of the extending portion 27, and the overlay material 21 makes it possible to form the peripheral portion 22a from the outside to the inside. Even if it is pressed toward it, the extending portion 27 acts as a guard to prevent the cushion 22 from losing its shape, so that the appearance of the seat 20 can be improved.

In the present embodiment, the extending portion 27 is provided on the side portion and the rear portion in the width direction of the seat 20, but on the front portion of the seat 20 and the side portion in the vicinity of the rotation support shaft member 11. Not provided. Since the front portion of the seat 20 is not restricted by the thickness of the cushion 22, the shape of the seat 20 can be maintained by forming the cushion 22 sufficiently thick. Further, if the extension portion 27 is provided on the front portion of the seat 20, it may hit the back of the knee of the seated user and impair the sitting comfort. Therefore, the extension portion 27 is not provided. Further, in the vicinity of the rotation support shaft member 11, friction between the seat 20 and the leg frame 2 may occur when the seat 20 is rotated. Therefore, the seat 20 and the leg frame 2 are not provided with the extension portion 27. Make sure to secure a gap with. As a result, when the seat 20 is rotated, the friction between the seat 20 and the leg frame 2 can be reduced, and in particular, the force when raising the seat 20 can be reduced, and the operability can be improved. However, the extension portion 27 is not limited to being provided in the vicinity of the rotation support shaft member 11, and may be provided.

Next, the fastening structure of the peripheral edge of the overlay 21 will be described in detail with reference to FIGS. 10 to 17. As shown in FIGS. 12 to 14, the peripheral edge 21a of the overlay 21 is provided with locking members 28 on both sides and locking members 29 at the front and rear ends. As the locking members 28 and 29, for example, a flat polypropylene cord having a thickness of about 1 mm and a rectangular cross section (generally called a PP cord) can be used. This flat plate-shaped PP cord having a rectangular cross section is relatively hard in the width direction (longitudinal direction) and exhibits flexibility in the thickness direction (short direction). However, the locking members 28 and 29 are not limited to the above-mentioned PP code. Here, since the edges of the front end and the rear end of the inner shell 23 in the seat of the present embodiment have a linear shape substantially parallel to the horizontal plane and curved in the width direction in the front-rear direction, the locking member. On the other hand, although flexibility along the bottom surface of the groove 23f of the inner shell 23 is not required, flexibility along the side surface of the groove 23f is required. Therefore, while the locking member 29 is arranged and sewn on the back surface of the overlay 21 along the peripheral edge, the overlay 21 is folded back so as to wrap the locking member 29 and then into the groove 23f of the inner shell 23. It is placed vertically (that is, the width direction in which the PP cord indicates rigidity is the insertion direction into the groove). On the other hand, both side portions of the inner shell 23 in the seat of the present embodiment have a spoiler shape in which the edges of the inner shell are substantially linear in the front-rear direction but are gently curved in an S shape with respect to the horizontal plane. Therefore, although flexibility along the bottom surface of the groove 23c of the inner shell 23 is required, flexibility along the side surface of the groove 23c is not required. Therefore, the locking member 28 is arranged horizontally in the groove 23c (that is, the thickness direction is set as the insertion direction into the groove so that the surface of the PP cord faces the bottom of the groove 23c). In the present embodiment, the locking member 28 is fastened to the overlay 21 by, for example, being housed in a storage bag 21b sewn to the peripheral edge 21a of the overlay 21. However, the configuration for fastening the locking members 28 and 29 to the overlay 21 is not limited to being inserted into the storage bag 21b, and may be sewn directly to the peripheral edge 21a of the overlay 21, for example. .. In the present specification, the surface of the flat plate-shaped locking members 28, 29 means a surface orthogonal to the thickness direction of the locking members 28, 29.

As shown in FIGS. 11 to 14 and 16, a pair of ribs 23b having a shape protruding downward along the outer periphery are provided on both sides of the inner shell 23 at regular intervals on the peripheral edges on both sides of the back surface of the inner shell 23. At the same time, a pair of ribs 23e are provided at regular intervals on the front end portion and the rear end portion, respectively. A groove 23c is formed between the pair of ribs 23b, and a groove 23f is formed between the ribs 23e. In other words, the pair of ribs 23b and the groove portion 23c in the inner shell 23 are formed along the edges on both sides of the inner shell 23. Therefore, the pair of ribs 23b and the groove portion 23c are formed so as to be substantially linear in the front-rear direction (that is, substantially linearly extending in the front-rear direction when viewed from the bottom surface). Further, the bottom surface of the groove portion 23c (that is, the back surface of the inner shell 23) has a spoiler shape curved in an S shape that gently undulates with respect to the horizontal plane. In the present embodiment, the inner shell 23 has ribs for ensuring the rigidity of the inner shell 23 in addition to the ribs 23b and 23e at four locations. The groove portions 23c and 23f accommodate the locking members 28 and 29 of the overlay 21. The width of the groove 23c is at least slightly wider than the width of the PP cord and the thickness of the storage bag 21b, and the width of the groove 23f is at least slightly wider than the thickness of the PP cord and the thickness of the overlay 21. It is preferably wide.

In the present embodiment, in the groove portions 23c provided on both side portions in the width direction of the inner shell 23, the surface of the locking member 28 is arranged so as to face the bottom surface of the groove portion 23c so as to exhibit flexibility. Therefore, it is housed in the groove portion 23c along the spline shape of the inner shell 23. That is, by using the locking member 28 in the groove portion 23c so-called horizontally, the locking member 28 is made to exhibit flexibility along the shape of the inner shell 23. In the present embodiment, the width of the groove 23c needs to be set to be at least the same as or slightly wider than the width of the locking member 28, but is slightly wider than the width of the PP cord and the thickness of the storage bag 21b. It is preferable to have. As a result, the locking member 28 housed in the bottom portion of the groove portion 23c is stably held by the ribs 23b from both sides in the width direction. On the other hand, the width of the groove portion 23f needs to be set wider than at least the thickness of the PP cord and the thickness of the overlay 21, but there is no problem in inserting the locking member 28 and the overlay 21. Moreover, it is preferable that the area is such that it does not come off.

As shown in FIGS. 12 and 13, the overlay 21 wraps around from the surface side of the seat 20 beyond the extension portion 27 along the back side of the inner shell 23 in a substantially horizontal direction, and the peripheral edge 21a is a rib 23b. It goes upward toward the bottom of the groove 23c beyond the above. That is, the groove portion 23c is bent at about 90 ° with respect to the direction in which the tension of the overhanging ground 21 acts, so that the groove portion 23c is not on the same line and the tension applying direction is changed. Therefore, the tension generated in the overhanging ground 21 acts in the horizontal direction from the lower side of the extending portion 27, but the overhanging ground 21 is easily bent in the downward direction by the ribs 23b. It is restrained from falling out.

As shown in FIGS. 13 and 14, the groove portion 23c into which the horizontally placed locking member 28 is inserted has a locking portion 23d. The locking portion 23d is, for example, a claw facing the bottom surface side (upward in FIG. 13) of the groove portion 23c, and when the locking member 28 is inserted into the groove portion 23c, the locking portion 23d is deformed in a direction of expanding the groove width while being inside the groove. When the accommodated locking member 28 is pulled and tries to escape from the groove portion 23c, it is restricted from engaging with the locking member 28 and exiting. As a result, when the overhanging ground 21 is pulled, it is possible to prevent the laterally placed locking member 28 from coming off from the groove portion 23c. In the present embodiment, the locking portion 23d projects inward from each of the pair of ribs 23b toward the bottom surface side of the groove portion 23c so as to be locked on both sides of the locking member 28 in the width direction. It is formed so as to be inclined and is provided as a pair facing each other in the width direction. As a result, when the locking member 28 is provided in the groove 23c, it passes between the locking portions 23d and is provided at the bottom, and when the locking member 28 provided in the groove 23c is pulled and tries to come out. Is caught on both sides in the width direction by the locking portion 23d to prevent it from coming off. Therefore, it is desired that the distance between the paired locking portions 23d is shorter than the length of the locking member 28 in the width direction. The shape of the locking portion 23d is not limited to the claw shape, and may be a convex portion or the like as long as the locking member 28 can be prevented from coming off from the groove portion 23c. Further, in the present embodiment, since the inner shell 23 is a resin molded product, the groove portion 23c and the locking portion 23d can be integrally formed when the inner shell 23 is formed.

Further, as shown in FIGS. 10 and 11 and FIG. 16, the locking portions 23d are arranged at, for example, five locations with substantially equal intervals from one groove portion 23c in the present embodiment. It is provided so as to be evenly fastened to the inner shell 23 over the entire area of the locking member 28 arranged on the side portion of the chair 20, but the present invention is not particularly limited to this, and the locking portion 23d is provided. The quantity will be changed accordingly. Further, in the present embodiment, the paired locking portions 23d are arranged facing each other between the left and right ribs 23b, but the present invention is not particularly limited, and the locking portions 23d are arranged so as to be offset in the longitudinal direction of the groove. You may do so.

On the other hand, as shown in FIGS. 12 and 13, the seat frame 24 is formed with a jetty-shaped retaining portion 24a that enters the groove portion 23c at a position facing the groove portion 23c of the inner shell 23. The retaining portion 24a is not always pressed against the locking member 28 housed in the groove portion 23c, but is arranged so as to face each other with a clearance. That is, the peripheral edge portion of the overlay 21 is not fixed by the retaining portion 24a. The retaining portion 24a is designed to prevent the locking member 28 from coming into contact with the locking member 28 when the locking member 28 housed in the groove portion 23c tries to escape from the groove portion 23c. That is, in the normal state where no external force acts on the overhanging ground 21, the locking member 28 does not come into contact with the retaining portion 24a, and when the external force acts on the overhanging ground 21 and a large tension acts, the locking member 28 does not abut. Is in contact with the retaining portion 24a and is prevented from coming out.

Further, the seat frame 24 has ribs 24b so as to be adjacent to the ribs 23b of the inner shell 23. Therefore, as shown in FIG. 12, at the peripheral edge portion between the inner shell 23 and the seat frame 24, the ribs 23b of the inner shell 23 and the ribs 24b of the seat frame 24 are alternately arranged adjacent to each other in a labyrinth-like manner.

Here, since the seat frame 24 has a thin frame shape, if the peripheral edge 21a of the overlay 21 is to be tightened with a string member in the present embodiment, it may not fit in the seat frame 24. On the other hand, in the present embodiment, the peripheral edge 21a of the overlay 21 is fastened to the peripheral edges of the inner shell 23 and the seat frame 24, so that the peripheral edge 21a of the overlay 21 is housed in the seat frame 24. And can improve the appearance.

According to the seat 20 of the chair 1 configured as described above, the inner shell 23 has a flange-shaped extending portion 27, and the peripheral portion 22a of the cushion 22 abuts in the vertical direction with respect to the extending portion 27. Therefore, the peripheral edge portion 22a does not wrap around to the back side of the inner shell 23 ahead of the extension portion 27. Therefore, the cushion 22 is less likely to be crushed as compared with the case where the cushion 22 is wrapped around the back side of the inner shell 23. As a result, the peripheral edge portion 22a of the cushion 22 can be easily made into a flat shape by utilizing the outer peripheral surface 27a of the extending portion 27, so that the appearance of the seat 20 can be improved.

Further, since the peripheral edge portion 22a of the cushion 22 abuts on the extending portion 27, even if the overlay portion 21 presses the cushion 22 from the outside to the inside, the extending portion 27 acts as a guard to prevent the cushion 22 from losing its shape. , It is possible to prevent the cushion 22 from being partially recessed from the extending portion 27. Therefore, the crushing of the cushion 22 is suppressed, and wrinkles of the overlay 21 are less likely to occur, so that the stability of the appearance of the seat 20 can be improved.

Although the above-described embodiment is an example of a preferred embodiment of the present invention, the embodiment of the present invention is not limited to the above-mentioned embodiment, and the present invention is not limited to the above-mentioned embodiment and does not deviate from the gist of the present invention. The invention can be modified in various ways. For example, in the above-described embodiment, the structure according to the present invention is described with reference to an example in which the seat 20 of the nesting chair 1 is applied, but the present invention is not particularly limited thereto, and other types of chair seats are described. Can be selected as appropriate. For example, a single seat plate (not separated into an inner shell and a seat frame) may be provided with a groove for accommodating the peripheral edge of the overlay 21 and the peripheral edge of the overlay 21 may be applied to the fastening structure.

Further, in the above-described embodiment, the case where the resin molded product is applied as the inner shell 23 has been described, but the present invention is not limited to this, and a member used as an existing inner shell such as plywood may be applied. For example, in the case of plywood, after forming the plywood, an extension portion can be formed by additional machining. Further, in the case of an inner shell made of plywood, although not shown, the groove portions 23c and 23f are formed by groove processing, and the groove portions are formed by using a rail (corresponding to ribs 23b and 23e) of another member made of a steel plate or the like. 23c, 23f and the locking portion 23d may be provided.

Further, the locking member 28 has a flexibility that can follow the shape of the inner shell 23, and is particularly cross-sectional if it has a shape (thing) that can be prevented from coming off by locking to the locking portion 23d. The shape is not limited to the rectangular flat plate-shaped component, and the cross-sectional shape may be a polygonal shape such as an elliptical shape, a tubular shape, a square shape, or a triangular shape. For example, in the case of using a locking member having a triangular cross-sectional shape, if the ridgeline portion is inserted toward the bottom surface of the groove, the locking member 28 is easily pushed in when the locking member 28 is inserted into the groove portion 23c, and then the engaging member 28 is engaged. It is possible to prevent the locking member 28 from coming off by being caught on the stop portion 23d. Further, even when a flexible material such as a wire is applied as the locking member 28, the size is set so that the width of the groove portion 23c and the distance between the pairing locking portions 23d are inserted and cannot be pulled out. If it is managed, there is no particular problem.

Further, in the above-described embodiment, the chair seat is described as an example, but the structure of the chair is not limited to that in the above-described embodiment. Specifically, for example, it can be applied to a backrest, a headrest, an armrest, and the like.

1 chair 20 seats (structure)
21 Agehari (skin material)
21a Periphery (periphery of skin material)
21b Storage bag 22 Cushion (cushion material)
23 Inner shell 23c Groove 23d Locking part 24 Seat frame (outer shell)
24a Retaining part 28 Locking member

Claims (6)

A cushioning material is layered on the inner shell and covered with the skin material, and the peripheral edge of the skin material is wrapped around the back side of the inner shell, and the locking member provided on the peripheral edge of the skin material is fastened to the back side of the inner shell. In the structure of the chair
The inner shell restricts the groove portion accommodating the locking member on the back side and the locking member accommodated in the groove portion from engaging with the locking member when trying to escape from the groove portion. Has a locking part to
The locking member has flexibility along the bottom surface of the groove portion of the inner shell, and is housed in the groove portion along the shape of the inner shell. An outer shell that supports the inner shell from below is provided.
The outer shell is arranged so as to face the locking member housed in the groove portion with a clearance, and when the locking member housed in the groove portion tries to come out of the groove portion, the outer shell is said. The structure of a chair according to claim 1, further comprising a retaining portion for restricting the locking member from coming into contact with the locking member. The structure of a chair according to claim 1 or 2, wherein the locking member has a flat plate shape, and the surface thereof is housed in the groove along the bottom surface of the groove of the inner shell. The chair structure according to any one of claims 1 to 3, wherein the locking member is provided in a storage bag provided on the peripheral edge of the skin material. The structure is a seat of a chair, and the groove for accommodating the locking member is formed so as to extend in the front-rear direction along the left and right side edges of the back surface of the inner shell of the seat. The chair structure according to any one of claims 1 to 4, characterized in that. A chair comprising the structure according to any one of claims 1 to 5.

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