Upholstery for chair and chair

Abstract

To provide soft-feeling upholstery for a cushion material of a chair.SOLUTION: Upholstery 17 is a knitted fabric produced by a flat knitting machine. A surface part 42 to be overlapped on a cushion material 16 from the front has a large number of rib-stitched protrusions 44. Since a thick cloth can be formed by three-dimensional knitting while using a thin yarn, even when there are irregularities on a surface of the cushion material, the irregularities can be absorbed and soft feeling can be provided to a user. When the protrusions 44 are arranged so as to face the cushion material 16, orthodox appearance with no irregularity feeling can be formed.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a seat fabric (upholstery fabric for a chair) and a chair using the same.

Background Art

[0002] In a chair where the seat and backrest are of a structure in which a cushion is stretched over a resin inner shell, the cushion is covered with a seat fabric (upholstery material). The seat fabric can be a woven fabric or a knitted fabric, but in any case, it has a thin single-layer structure (for example, Patent Document 1). That is, the conventional seat fabric material is in the form of a fabric roll, which is cut into a predetermined size to form the seat fabric.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Now, polyurethane foam is often used as a cushion material for the seat and backrest of a chair. However, polyurethane foam does not have sufficient elastic force and air permeability, and the elastic restoring force may decrease with use. Therefore, a cushion material with high elastic force, that is, a hard cushion material, may be used, or unevenness may be provided on the surface to improve air permeability. In such cases, a problem has been found that the feeling of use deteriorates.

[0005] Regarding this point, it is conceivable to use thick yarns for the seat fabric to make it thicker or to use a laminated method in which multiple sheets are stacked. However, simply making it thicker has a problem that the surface has a rough appearance and cannot withstand use, and on the other hand, the laminated method has a problem that it takes a great deal of labor in manufacturing.

[0006] The present invention has been made to improve such a situation.

Means for Solving the Problems

[0007] The present invention includes various configurations, and examples thereof are specified in each claim. Among these, the invention of claim 1 relates to a fabric covering a cushion material in a chair, and this fabric "has a surface portion that overlaps the surface of the cushion material, and the surface portion has a waffle structure in which three-dimensionally raised convex portions and thin valley portions are arranged alternately." It has such a configuration.

[0008] The invention of claim 2 is a developed example of claim 1, "the surface portion is composed of a thick portion that constitutes all or a part of the outer peripheral portion and a standard thickness portion that is the other part and is thinner than the thick portion, and the standard thickness portion and the thick portion are each composed of a group of the raised strip portions and the valley portions." It has such a configuration.

[0009] The invention of claim 3 is a developed example of claim 1 or 2, "the surface portion is arranged such that the raised strip portions protrude toward the cushion material." It has such a configuration.

[0010] The invention of claim 4 is also a developed example of claim 1 or 2, "the cushion material overlaps with a shell member, the surface portion and a back surface portion that continues integrally with the periphery of the surface portion and wraps around the back side of the shell member are formed in a bag shape, and the whole is integrally knitted." It has such a configuration.

[0011] The invention of claim 5 is a developed example of claim 4 "the whole is knitted by horizontal knitting (weft knitting), and the back surface portion is thinner than the surface portion." It has such a configuration.

[0012] The invention according to claim 6 is a development example of the invention according to claim 5. "The inner peripheral portion of the back surface portion is formed with a reinforcing portion having a ridged knitting structure in which a large number of ridge portions and valley portions are alternately arranged, and the thick portion of the back surface portion is thinner than the standard thickness portion of the front surface portion." It has such a configuration.

[0013] The invention according to claim 7 relates to a chair. "The support element against which the user's body hits has a cushioning material stacked on the shell member and a fabric covering the cushioning material. The cushioning material is composed of a three-dimensional network body formed by entangling a group of bent synthetic resin elastic fibers, and the fabric is composed of the chair fabric described in claim 1 or 2." It has such a configuration.

[0014] The invention according to claim 8 is a development example of the invention according to claim 8. "The cushioning material overlaps the shell part For the material and overlaps. As the support element, a seat in which the cushioning material is stacked on the seat inner shell which is an example of the shell member is included." It has such a configuration. That is, at least the characteristics of the present invention are retained in the fabric of the seat.

[0015] The invention according to claim 9 is a development example of the invention according to claim 7. "The front portion of the seat inner shell and the front portion of the cushioning material are a deformation allowance portion that can be wound downward, and the front portion of the back surface portion of the fabric is arranged so as to cover the deformation allowance portion from below." It has such a configuration.

Advantages of the Invention

[0016] When an embossed floor with a wale knitting structure is adopted as the stretched fabric as in the present invention, a thick fabric can be formed using thin threads. Therefore, while ensuring a beautiful surface state, a seated person can obtain a soft feeling of contact. That is, the stretched fabric can improve the cushioning property and the fitness, and can provide a soft touch. As a result, it can promote the use of a hard material or a material having unevenness on the surface as a cushion material for a chair. Further, since it can be manufactured by known wale knitting (double wale knitting is preferable), the practicality is high.

[0017] When the outer peripheral portion is thickened as in claim 2, the shape stability of the stretched fabric is increased, so that it can be arranged in alignment with the shape of the cushion material to improve the appearance. Also, the volume can be increased to further improve the cushioning property. In the case of a seat, the thigh portion of the seated person may hit the front edge of the seat. Even in this case, a high cushioning property can be ensured and it can contribute to reducing the feeling of being pushed up.

[0018] It is possible to expose the group of the ridge portions of the stretched fabric on the surface side. However, in this case, there is a possibility that the ridge portions may be distorted by the body pressure of the seated person during use, deteriorating the aesthetic feeling, or a person who does not like the appearance may appear. On the other hand, when the ridge portions are arranged on the back side as in claim 3, problems such as deterioration of the aesthetic feeling associated with use and deterioration of the aesthetic feeling due to the ridge portions being exposed can be solved.

[0019] In the configuration of claim 4, since the stretched fabric can be attached to the shell member without using a resin sheet or a string, etc., the workability of attachment is good. Also, since it is in a bag shape and is maintained in shape, the cushion material can be wrapped in an accurate posture, and the seat can be finished beautifully. The problem of wrinkles at the corner portion also does not occur. Although the shell member is supported by the outer member from the back side, by sandwiching the back surface portion of the stretched fabric between the shell member and the outer member, it can be held in a non-displaced state.

[0020] In the configuration of Claim 5, since the back portion is thinner than the front surface portion, thread can be saved in the invisible portion to suppress costs. Further, when a locking claw or the like protruding for attachment to the shell member is provided, it is also easy to penetrate the locking claw. In the configuration of Claim 6, the back portion can be brought into close contact with the cushion material without wrinkles or creases.

[0021] Claim 7 is directed to a chair. Although the cushion material is constituted by a three-dimensional net-like body, by using the fabric of the present invention, a soft touch can be enjoyed without impairing the advantages of the three-dimensional net-like body. Therefore, it is possible to provide a chair excellent in quality such as breathability and durability of the cushion material and also excellent in usability. The same applies to Claim 8. When the front portion of the seat is configured to be a roll-in type, there is a risk that the resin fibers constituting the three-dimensional net-like body may break and chips may fall. However, in Claim 9, even if the resin fiber breaks, the chips are received by the back portion of the fabric, so that it is possible to prevent the chips from falling onto the floor and impairing the aesthetic appearance or giving a sense of discomfort to the user.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0023] Next, embodiments of the present invention will be described with reference to the drawings. This embodiment is applied to a chair including a bench. In this application, terms such as "front and rear" and "left and right" are used to specify directions, which are based on the orientation of a person sitting in a normal posture. The depth direction is the front-rear direction. The front view is the direction facing the person sitting.

[0024] (1). Basic Structure of the First Embodiment First, an overview of the chair will be described. This embodiment is applied to a swivel chair commonly used in offices. First, the basic structure will be described with reference to FIGS. 1 to 4. The chair includes a leg device 1, a seat 2, and a backrest 3 as basic elements. The leg device 1 has a structure in which a leg column 4 made of a gas cylinder is erected at the center of a base having five caster-equipped leg blades.

[0025] A base 5 is fixed to the upper end of the leg column 4, and the lower ends of the left and right first tilting frames 6 are connected to the base 5. As shown in FIG. 1(B), the first tilting frame 6 extends rearward from the base 5 and rises while spreading outward to the left and right. The upper part of the first tilting frame 6 constitutes the side members of the lower back frame 7. An upper frame body 8 is connected to the lower back frame 7. The upper frame body 8 and the base 5 are connected by a second tilting frame 9. A back plate 10 is attached to the upper and lower frame bodies 7 and 8.

[0026] As shown in FIGS. 2 and 3, the seat 2 includes a resin seat inner shell (seat plate) 15, a cushion material 16 stacked thereon, and a covering material (skin material) 17 covering the cushion material 16 from above. The seat inner shell 15 is supported from below by a resin outer shell (intermediate member) 18. The seat inner shell 15 is an example of the shell member described in the claims. The cushion material 16 of the present embodiment is composed of a three-dimensional network body, but as the cushion material 16, various materials and structures such as conventional foamed urethane resin and non-woven fabric can be adopted. Those with natural fibers hardened can also be used.

[0027] The seat inner shell 15 is composed of a base portion 15a fixed to the outer shell 18 and occupying 70% to 80% of the front-rear width, a left and right horizontally long front rigid body portion 15b constituting the front end portion, and a deformation allowance portion 15c located between the two. When the deformation allowance portion 15c bends downward, as shown in FIG. 1(C), the front portion of the seat 2 can be wrapped downward.

[0028] Then, as shown in FIG. 2, a movable support 19 having a portion protruding forward is movably mounted on the outer shell 18 in the front-rear direction and cannot be disengaged upward. The left and right front engaging portions 20 provided at the front end of the movable support 19 are engaged with the left and right hook-shaped brackets 21 protruding downward from the front rigid body portion 15b of the seat inner shell 15. Therefore, by moving the movable support 19 back and forth, the depth dimension (position of the front end) of the seat 2 can be adjusted according to the physique and preference of the user. As shown in each sub-figure of FIG. 1, a depth adjustment handle 22 for moving the movable support 19 back and forth is rotatably mounted on the left side edge of the outer shell 18.

[0029] As shown in Fig. 2, a support arm 23 that projects outward left and right and has a front end protruding upward is formed on the first tilting frame 6. A rear bearing portion 24 provided at the rear of the outer shell 18 is connected to the support arm 23 by a pin 25 (see Fig. 2) having a longitudinal length left and right. On the other hand, as shown in Fig. 2, a pair of left and right front mounts 26 are arranged at the front-leaning portion of the base 5, and the front portion of the outer shell 18 is connected to the front mounts 26 via a joint member 27 so as to be movable back and forth and non-separable upward. Therefore, when the backrest 3 tilts backward, the seat 2 moves backward while tilting backward.

[0030] (2). Structure of the seat inner shell As can be understood from Figs. 2 and 3, the seat inner shell 15 is in a form that is concave upward in a front view and has a deeper rear portion in a side view, and the cushion material 16 and the webbing 17 also follow this form.

[0031] For example, as shown in Fig. 4, the deformation allowance portion 15c of the seat inner shell 15 is composed of a plurality of (five) horizontally long slits 29, a horizontally long bar portion 30 located between adjacent horizontally long slits 29, and five pairs of left and right bridges 31 arranged across the horizontally long slits 29. The adjacent horizontally long bar portions 30, the horizontally long bar portion 30 located at the rear end and the front end of the base portion 15a, and the horizontally long bar portion 30 located at the front end and the front rigid body portion 15b are connected by the left and right bridges 31.

[0032] The horizontally long bar portion 30 forms a U-shaped form that opens downward in a side view, and the bridge 31 forms a U-shaped form that opens upward in a side view. For this reason, the deformation allowance portion 15c can be easily bent and deformed so as to bend downward in a side view as shown by the dashed-dotted line in Fig. 4.

[0033] As shown in FIGS. 2, 3, and 4, a large number of circular small holes are arranged vertically and horizontally in the base portion 15a of the seat inner shell 15. As shown in FIG. 3, a downward engaging frame portion 32 having a left-right longitudinal shape projects downward at the front portion of the base portion 15a of the seat inner shell 15. On the other hand, as shown in FIGS. 2 and 4, a pair of left and right upward engaging bosses 33 project upward at the front-leaning portion of the outer shell 18. At both left and right ends of the downward engaging frame portion 32 of the seat inner shell 15, ant-groove portions 34 opening rearward are provided. On the upward engaging boss 33 of the outer shell 18, a flange 35 into which the ant-groove portion 34 is fitted from the front is provided.

[0034] Furthermore, as shown in FIG. 3, a pair of left and right female screw boss portions 36 project downward at a portion of the base portion 15a of the seat inner shell 15 that is slightly rearward. A screw (not shown) inserted into the outer shell 18 from below is screwed into the female screw boss portion 36. The attachment of the seat inner shell 15 to the outer shell 18 is performed in the following procedure: First, the base portion 15a of the seat inner shell 15 is placed on the outer shell 18 and slid backward to fit the downward engaging frame portion 32 and the upward engaging boss 33 together. Then, two screws passed through the outer shell 18 from below are screwed into the female screw boss portions 36.

[0035] The upward engaging boss 33 provided on the outer shell 18 penetrates the movable support 19 from below, and its upper end is exposed and fitted with the downward engaging frame portion 32. The upward engaging boss 33 also has a function of holding the movable support 19 in a non-upwardly separable manner and slidable back and forth.

[0036] As shown in FIG. 3, a pair of left and right downward guide ribs 37 that are long in the front-rear direction project downward at approximately the front-rear middle of the base portion 15a of the seat inner shell 15. On the other hand, as shown in FIG. 2, the outer shell 18 is provided with a pair of left and right upward guide ribs 38 that are long in the front-rear direction, and the left and right downward guide ribs 37 are sandwiched from both left and right sides by the left and right upward guide ribs 38. For this reason, the posture of the base portion 15a of the seat inner shell 15 is accurately maintained.

[0037] For example, as shown in FIG. 4, downward engaging claws 39 having an L shape in a front view are provided at the left and right front end portions of the base 15a of the seat inner shell 15, while upward engaging claws 40 having an inverted L shape for the downward engaging claws 39 to engage from the front side are provided at the left and right both end portions of the front portion of the outer shell 18.

[0038] The cushion material 16 is a three-dimensional network body formed by entangling and bonding a large number of thermoplastic synthetic resin fibers that are bent and twisted. The cushion material 16 is made of a commercially available plate-shaped three-dimensional network body or a block cut into a square shape, and by sandwiching this with a pair of pressing molds, the entire surface is formed into a three-dimensional curved surface shape.

[0039] (3). Structure of the stretching fabric The stretching fabric 17 of the present embodiment is a knitted fabric knitted by horizontal knitting, and is formed in a bag shape by a front surface portion 41 that overlaps the cushion material 16 from above and a back surface portion 42 that overlaps the cushion material 16 from below. More precisely, the stretching fabric 17 also has a peripheral surface portion that overlaps the outer periphery of the cushion material 16, but since the front surface portion 41 wraps around the outer peripheral portion of the cushion material 16, in reality, it can be said that it is composed of the front surface portion 41 and the back surface portion 42 without error. Of course, it is possible to form the outer peripheral portion into a unique structure.

[0040] As shown in FIG. 7(A), the back surface portion 42 of the stretching fabric 17 has an opening 43, and the downward engaging frame portion 32 and the downward guide rib 37 of the seat inner shell 15 are exposed in the opening 43. On the other hand, the downward engaging claws 39 and the female screw boss portion 36 of the seat inner shell 15 penetrate through the back surface portion 42 and are exposed.

[0041] As shown in FIGS. 7(B) and 9(A), the surface portion 41 of the base fabric 17 has ridge portions 44 formed by double-rib knitting. In this case, as clearly shown in FIG. 7(B), a certain range on the outer peripheral side forms a thick portion 41a, and the inner side surrounded by the thick portion 41a forms a standard-thickness portion 41b. Then, as clearly shown in FIG. 9, when double-rib knitting is carried out by horizontal knitting, the thick portion 41a is formed by making the height of the ridge portion (rear ridge portion) 44 higher on the outer peripheral side. In any case, since the thickness at the location of the standard-thickness portion 41b is around 5 mm, the surface portion 41 of the base fabric 17 has a very large volume. Roughly speaking, it can be said that the standard-thickness portion 41b may have a thickness of 3 mm or more.

[0042] The portion between adjacent ridge portions 44 forms a valley portion 45. And since the surface portion 41 is arranged such that the ridge portions 44 face the cushion material 16, the intermittent state of the ridge portions 44 and the valley portions 45 cannot be visually recognized, and the appearance of the seat 2 presents an appearance in which the lines corresponding to the ridge portions 44 and the lines of the valley portions 45 are arranged alternately. That is, it presents the appearance of a simple knitted fabric as if there are no irregularities.

[0043] The back surface portion 42 is also rib-knitted, but the thickness is thinner than that of the surface portion 41, and the inner peripheral portion forms a thick portion 42a. For example, the reference thickness of the back surface portion 42 is set to about 1 to 2 mm, and the thickness of the thick portion 42a is set to about 3 mm (2 to 4 mm). As can be understood from FIG. 9(C), the back surface portion 42 is also rib-knitted and a number of ridge portions (rear ridge portions) 46 are arranged in parallel with valleys in between. For example, the pitch of the ridge portions 46 in the back surface portion 42 is set to twice the pitch of the ridge portions 47 in the base portion 42b excluding the thick portion 42a, and the thickness is also increased.

[0044] As shown in Fig. 5, the cushioning material 16 has a roughly rectangular outer shape with rounded corners. However, since the ground fabric 17 of the present embodiment is a knitted fabric knitted by a weft knitting machine, it can be knitted in a state with rounded corners according to the outer shape of the cushioning material 16. Therefore, the ground fabric 17 can be fitted to the cushioning material 16 (it is preferable that the ground fabric 17 is made slightly smaller than the cushioning material 16 and tightly wraps the cushioning material 16).

[0045] As shown in Fig. 8(B), the front part of the back surface portion 42 is arranged to cover the deformation allowance portion 15 of the seat inner shell 15 from below. When the winding and returning of the seat 2 are repeated, the resin fibers constituting the cushioning material 16 may be damaged and chips may be generated. However, even if chips are generated, they can be received by the back surface portion 42 of the ground fabric 17, so problems such as deterioration of aesthetic feeling do not occur.

[0046] In the present embodiment, the back surface portion 42 of the ground fabric 17 can be held down by the seat inner shell 15 and the outer shell 18. Therefore, fixing means is not necessarily required, but it is possible to press and fix an appropriate portion of the back surface portion 42 to the seat inner shell 15 with a tape material or the like.

[0047] For example, it is possible to provide snap projections such as mushroom shapes on the seat inner shell 15, expose the snap projections from the back surface portion 42, and fit the snap projections into the tape material in that state. Or, it is also possible to make engagement holes at intervals in the seat inner shell 15 and fit snap projections provided on the tape material into the engagement holes. The tape material for pressing and fixing can also be arranged partially.

[0048] The present embodiment has the above configuration. The cushioning material 16 is composed of a three-dimensional net-like body and has a rough surface. However, since the surface portion 41 of the ground fabric 17 of the embodiment has a thickness of several millimeters, it can absorb the roughness of the cushioning material 16 and provide a comfortable hitting feeling to the user. Also, because the ground fabric 17 is thick, the ground fabric 17 itself exhibits cushioning properties and fitting properties, so the contact with the body becomes softer and more comfortable.

[0049] In addition, since the upholstery 17 is given volume by rib knitting, the thread used can be thin, and therefore the surface of the upholstery 17 does not have a rough appearance, but has a pleasant feel like apparel and an excellent appearance. Based on such a knitted structure, the upholstery 17 for the seat can demonstrate high functionality.

[0050] The thighs and buttocks of a seated person often overlap the periphery of the seat, but if the outer periphery of the upholstery 17 is formed into a thick portion 41a as in the embodiment, the body pressure of the seated person is supported by the thick portion 41a, further improving the fit and cushioning. In addition, the thick portion 41a improves the shape retention of the surface portion 41, so that the surface portion 41 fits snugly over the cushioning material 16 simply by enfolding the cushioning material 16 with the upholstery 17. This prevents the surface portion 41 from shifting, resulting in a beautiful finish.

[0051] Chair seats are generally curved so that the part where the sitter's buttocks rest is the deepest, and therefore, in order to prevent the upholstery from floating, the upholstery is pulled in toward the seat inner shell at the deepest point.

[0052] It has also been proposed to use a fastener as a means for pulling the upholstery in. For example, JP 2007-330398 A discloses a method in which a plate-shaped fastener is sewn to the back of the upholstery and a claw portion of the fastener is fitted into a middle plate disposed on the back side of the cushion.

[0053] However, it is troublesome to attach the fasteners one by one, and it is also troublesome to fasten them to the seat inner shell. On the other hand, it is also possible to sew a thread (string material) to the underside of the upholstery, pass the thread through the cushion material, and tie it to the seat inner shell to secure it, but this is also troublesome.

[0054] Regarding this point, in the present embodiment, as shown by the dashed-dotted line in FIGS. 7(B) and 9(B), a part of the convex portion 44 is largely extended downward at the deepest part of the seat 2 to form the drawing-in portion 44a, and this drawing-in portion 44a can be fixed to the seat inner shell 15 (note that the display position of the drawing-in portion 44a in FIG. 9(B) is for convenience, and actually it is located behind the displayed position.).

[0055] For the fixation of the drawing-in portion 44a, various configurations can be adopted, such as fixing it with a tucker or pressing and fixing it with a pressing member. The seat inner shell 15 has a through-hole for exposing the drawing-in portion 44a downward.

[0056] Since the drawing-in portion 44a is integrally formed with the surface portion 41, there is no possibility that the sewing thread is exposed on the surface, and the surface portion 41 can be drawn in without a sense of incongruity. Therefore, it looks good. The labor of the work can also be reduced. It is also possible to form the drawing-in portion 44a to a protruding amount that does not penetrate the cushion material 16 and attach a locking plate or a locking string thereto. In this case as well, the good appearance is ensured. Also, it is easy to sew the locking plate, and the sewing portion does not appear on the appearance.

[0057] As described above, the embodiments of the present invention have been explained, but the present invention can be embodied in various other ways. For example, it can be applied not only to the seat but also to the backrest, the headrest, the armrest, etc. It is also possible to form a zigzag pattern or the like, and it is also possible to form a multicolor pattern using threads of different colors. In the embodiment, the cushion material and the width expand from the front to the back, and the ground fabric is made into a shape that matches the outer shape of the cushion material, but it is also possible to form it so that the left and right side edges are parallel (since the ground fabric deforms, it can be fitted to the cushion material).

[0058] The thin back portion is not necessarily required. It is also possible to fold back the surface portion to the side edge of the shell member and fix this with a tape or the like. Also, the present invention can be applied to a sofa type or bench type chair on which multiple people sit.

Industrial Applicability

[0059] The invention of the present application can be embodied in a chair and its upholstery. Therefore, it can be industrially utilized.

Explanation of Reference Numerals

[0060] Two-seater 15-seater inner shell 16 Cushioning material 17 Upholstery 18 Outer shell 41 Surface part 41a Thick part 41b Standard thickness part 42 Back part 42a Thick part of the back part 43 Opening 44 Ridge part of the surface part 44a Retracted part 45 Valley part of the surface part 46 Ridge part of the back part

Claims

1. A fabric covering the cushion material of a chair, having a surface portion overlapping the surface of the cushion material, the surface portion having a wale knitting structure in which three-dimensionally raised convex portions and thin valleys are arranged alternately. The chair fabric according to claim 2.

2. The surface portion is composed of a thick portion constituting all or part of the outer peripheral portion and a standard thickness portion other than that and thinner than the thick portion, and the standard thickness portion and the thick portion are each composed of a group of the ridge portions and valley portions. The chair fabric according to claim 1.

3. The surface portion is arranged such that the ridge portions protrude toward the cushion material. The chair fabric according to claim 1 or 2.

4. The cushion material overlaps the shell member, and is formed in a bag shape having the surface portion and a back surface portion that continues integrally with the periphery of the surface portion and wraps around the back side of the shell member, and the whole is integrally knitted. The chair fabric according to claim 1 or 2.

5. The whole is knitted in a horizontal knitting pattern, and the back surface portion is thinner than the surface portion. The chair fabric according to claim 4.

6. A reinforcing portion having a wale knitting structure in which a large number of ridge portions and valley portions are arranged alternately is formed in the inner peripheral portion of the back surface portion, and the thick portion of the back surface portion is thinner than the standard thickness portion of the surface portion. The chair fabric according to claim 5.

7. A support element against which a user's body hits has a cushion material and a fabric covering the cushion material, the cushion material being composed of a three-dimensional network body formed by intertwining a group of bent synthetic resin elastic fibers, and the fabric being composed of the chair fabric according to claim 1 or 2. Chair.

8. The cushion material overlaps the shell member, and the support element includes a seat in which the cushion material is stacked on a seat inner shell which is an example of the shell member. The chair according to claim 7.

9. The front portion of the seat inner shell and the front portion of the cushion material are formed into a deformation allowance portion that can be wound downward, and the front portion of the back surface portion of the fabric is arranged to cover the deformation allowance portion from below. The chair according to claim 8.

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