Chair

Abstract

To form a pocket in a seat part having flexibility of a chair and also to plan reinforcement of the seat part.SOLUTION: A chair is equipped with a seat part 100 having flexibility and a reinforcement seat 200. The seat part 100 is provided with at least one of a backrest seat part 120 and a seat surface seat part 110. The reinforcement seat 200 is arranged along the seat part 100. The first connection part 210 of the reinforcement seat 200 is a part of the Z direction side or the Y direction side of the reinforcement seat 200 and is connected to the seat part 100. The second connection part of the reinforcement seat 200 is a part situated on a Z' direction side or a Y' direction side for the first connection part 210 of the reinforcement seat 200, and is connected to the seat part 100. Between the reinforcement seat 200 and the seat part 100, there is installed a pocket P which is open at least to one of the X direction and the X' direction.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to a chair. [Background technology]

[0002] Patent Document 1 below describes a pocket structure for an automobile seat. This pocket structure includes a front upholstery of the automobile seat, a rear upholstery of the automobile seat, a frame disposed between the front upholstery and the rear upholstery, a cushion disposed between the front upholstery and the frame, and a pocket lining. A space is formed between the rear upholstery and the frame. The upper and lower ends of the pocket lining are fastened to the upper and lower ends of the inner surface of the rear upholstery. Both left and right ends of the rear upholstery are attached to both left and right ends of the front upholstery by a strip fastener. When the slide fastener is open, a horizontal pocket opening to the left and right is formed between the rear upholstery and the pocket lining. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-108803 Summary of the Invention [Problem to be solved by the invention]

[0004] An automobile seat has an internal frame, and the strength is ensured by this frame, etc. Therefore, the pocket lining cloth has its upper and lower ends fastened to the upper and lower ends of the inner surface of the rear upholstery, and simply forms a pocket between itself and the inner surface of the upholstery.

[0005] Incidentally, chairs used outdoors and the like are constructed with a seat portion having a flexible seat surface and backrest.

[0006] The present invention provides a pocket in the flexible seat portion of a chair and reinforces the seat portion. [Means for solving the problem]

[0007] A chair according to one aspect of the present invention comprises at least one flexible seat portion, a reinforcing sheet, and legs supporting the at least one seat portion. The at least one seat portion has at least one of a backrest seat portion and a seat cushion seat portion. The reinforcing sheet is arranged along the at least one seat portion. The reinforcing sheet has a first connection portion and a second connection portion. The first connection portion is a portion of the reinforcing sheet on one side in a first direction or one side in a second direction, and is connected to the at least one seat portion. The second connection portion is a portion of the reinforcing sheet located on the other side in the first direction or the other side in the second direction relative to the first connection portion, and is connected to the at least one seat portion. A pocket is provided between the reinforcing sheet and the at least one seat portion, opening in at least one of one side in a third direction and the other side in the third direction. The first direction is the up-down direction. The second direction is the front-rear direction. The third direction is a direction approximately perpendicular to the first direction and the second direction. [Effects of the Invention]

[0008] In the case of a chair of any of the above aspects of the present invention, the first connection portion and the second connection portion of the reinforcing sheet are connected to at least one seat portion and the reinforcing sheet is arranged along at least one seat portion, so that a pocket can be formed between the reinforcing sheet and at least one seat portion and at least one seat portion can be reinforced with the reinforcing sheet. [Brief explanation of the drawings]

[0009] [Figure 1A] 1 is a perspective view of a chair according to a first embodiment of the present invention, shown from the front, top, and right side. FIG. [Figure 1B] 1 is a perspective view of the chair of Example 1 shown from the back, top, and right side. FIG. [Figure 2A] FIG. 2A is an enlarged view of a portion 2A in FIG. 1B of the chair of Example 1. [Figure 2B]FIG. 2B is an enlarged view of the part 2B in FIG. 1B of the chair of Example 1. [Figure 2C] FIG. 2C is an enlarged view of the part 2C in FIG. 1B of the chair of Example 1. [Figure 2D] 2C is an enlarged side view of the chair of Example 1, showing the pocket in an expanded state, of part 2C in FIG. 1B. FIG. [Figure 3] 10 is an explanatory diagram showing the relationship between the seat surface sheet portion and the reinforcing sheet in a design modification of the chair of Example 1. FIG. [Figure 4A] 10 is a perspective view of a chair according to a second embodiment of the present invention, as viewed from the front, top, and right side. FIG. [Figure 4B] 10 is a schematic perspective view of the chair of Example 2 shown from the back, top, and left side. FIG. [Figure 5A] 5A is an enlarged side view of part 5A in FIG. 4B of the chair of Example 1. FIG. [Figure 5B] 5A is an enlarged view of part 5A in FIG. 1B of the chair of Example 1, seen from the back. FIG. [Figure 5C] FIG. 2 is a partial perspective view of the chair of the first embodiment shown from the back and bottom. [Figure 5D] 1 is a partial perspective view of the chair of Example 1 shown from the front, top, and right side. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments of the present invention will be described, including Examples 1 and 2 and their design modifications. Note that the components of the embodiments and design modifications described below can be combined with each other as long as they are not inconsistent. Also, note that the materials, shapes, dimensions, numbers, and arrangements of the components in each aspect of the embodiments and design modifications described below are merely examples, and that any design modifications are possible as long as the same functions can be achieved. [Example]

[0011] Hereinafter, a chair C1 according to a first embodiment of the present invention and several other embodiments, including design modifications thereof, will be described with reference to FIGS. 1A to 3. FIGS. 1A to 2D show the chair C1 of the first embodiment. FIG. 3 shows a design modification of the chair C1 of the first embodiment. FIGS. 1A and 1B show the Z-Z' direction, the Y-Y' direction, and the X-X' direction. The Z-Z' direction is the height direction (vertical direction (first direction)) of the chair C1, and includes the Z direction, which is the upward direction, and the Z' direction, which is the downward direction. The Y-Y' direction is the front-to-back direction (second direction) of the chair C1, which is approximately perpendicular to the Z-Z' direction, and includes the Y direction, which is the forward direction, and the Y' direction, which is the backward direction. The X-X' direction (third direction) is approximately perpendicular to the Z-Z' direction and the Y-Y' direction, and includes the X direction and the X' direction.

[0012] The chair C1 comprises at least one seat portion 100 which is flexible.

[0013] At least one seat portion 100 may have at least one of a seat cushion portion 110 and a backrest portion 120.

[0014] The seat cushion portion 110 is a flexible sheet that has a substantially polygonal shape (e.g., a quadrangular shape (see FIGS. 1A to 3), a pentagonal shape, a hexagonal shape, etc.) when viewed in the Z direction (in a plan view), and may be made of one or more layers of fabric made of polyester, nylon, cotton, polycotton, etc. (see FIGS. 1A to 3), or may be configured with multiple parts made of the one or more layers of fabric connected together (not shown). Note that the fabric may be subjected to a breathable water-repellent finish using a fluorine-based or silicone-based water-repellent agent, an impermeable waterproof finish using a polyurethane-based waterproof agent, a PVC coating, a PU coating, a DuraShield coating, a silicone coating, a UV-cut coating, a fire-resistant coating, etc., but it is also possible for the fabric to be uncoated or untreated.

[0015] The seat cushion sheet portion 110 has an upper surface on the Z-direction side and a lower surface on the Z'-direction side.

[0016] The seating surface portion 110 has four or more sides, including a first side 110a (front side) on the Y-direction side, a second side 110b (rear side) on the Y'-direction side, a third side 110c (one side) on the X-direction side, and a fourth side 110d (the other side) on the X'-direction side. Adjacent sides of the four or more sides butt together to form four or more corners of the seating surface portion 110.

[0017] At least one of the first side 110a, second side 110b, third side 110c, and fourth side 110d of the seating surface portion 110 may have a reinforcing portion. The reinforcing portion may be configured by hemming at least one side, by sewing, gluing, or thermocompressing a separate piece of fabric to at least one side, or by embedding a reinforcing plate such as a resin plate or metal plate in at least one side. In FIGS. 1A to 2D, the first side 110a, second side 110b, third side 110c, and fourth side 110d of the seating surface portion 110 have a reinforcing portion that is a hemming. Note that the reinforcing portion on at least one side of the seating surface portion 110 may be omitted.

[0018] The backrest sheet portion 120 is a flexible sheet that is separate from the seat cushion sheet portion 110 and has a generally upside-down convex shape when viewed from the Y direction (see FIGS. 1A to 2D) or a generally polygonal shape (e.g., a square, pentagonal, or hexagonal shape (not shown)). The backrest sheet portion 120 may be made of one or more layers of fabric, or may be configured by connecting multiple parts made of one or more layers of fabric. When the backrest sheet portion 120 has the generally upside-down convex shape, the backrest sheet portion 120 is a flexible sheet that has a generally upside-down convex shape when viewed from the Y direction, and has an upper portion 121 and a lower portion 122 whose dimension in the X-X' direction is smaller than the dimension of the upper portion 121 in the X-X' direction. In FIGS. 1A to 2D, the backrest sheet portion 120 has the generally upside-down convex shape, and the lower side of the upper portion 121 (part) is connected to the upper side of the lower portion 122 (part).

[0019] The backrest sheet portion 120 has a front surface on the Y direction side and a rear surface on the Y' direction side.

[0020] The backrest sheet portion 120 has four or more sides, including a first side 120a (upper side) on the Z-direction side, a second side 120b (lower side) on the Z'-direction side, a third side 120c (one side) on the X-direction side, and a fourth side 120d (the other side) on the X'-direction side. The third side 120c and the fourth side 120d are provided with insertion portions 121c and 121d that open downward. 1A to 2D, the upper side of the upper part 121 is the first side 120a of the backrest sheet portion 120, the lower side of the lower part 122 is the second side 120b of the backrest sheet portion 120, the side edges of the upper part 121 and the lower part 122 in the X direction are the third side 120c of the backrest sheet portion 120, and the side edges of the upper part 121 and the lower part 122 in the X' direction are the fourth side 120d of the backrest sheet portion 120. The insertion parts 121c and 121d are provided on the third and fourth sides of the upper part 121.

[0021] At least one of the first side 120a, the second side 120b, the third side 120c, and the fourth side 120d (the other side) of the backrest sheet portion 120 may have a reinforcing portion. The reinforcing portion can be configured by hemming at least one of the sides, by sewing, gluing, or thermocompressing a separate piece of fabric to at least one of the sides, or by embedding a reinforcing plate such as a resin plate or a metal plate in at least one of the sides. 1A to 2D, the upper edge of the upper portion 121, i.e., the first edge 120a of the backrest sheet portion 120, has a reinforcing edge which is a hem, the side edge of the lower portion 122 in the X direction, i.e., the third edge 120c of the backrest sheet portion 120, has a reinforcing edge which is a hem, and the side edge of the lower portion 122 in the X' direction, i.e., the fourth edge 120d of the backrest sheet portion 120, has a reinforcing edge which is a hem. Note that the reinforcing edge of at least one edge of the backrest sheet portion 120 can be omitted.

[0022] The second side portion 120b of the backrest sheet portion 120 is connected to a portion on the Y-direction side of the second side portion 110b of the seat surface sheet portion 110 or to the second side portion 110b of the seat surface sheet portion 110. For example, the second side portion 120b of the backrest sheet portion 120 may be connected to a portion on the Y-direction side of the second side portion 110b of the seat surface sheet portion 110 or to the second side portion 110b of the seat surface sheet portion 110 by sewing, bonding, or thermocompression bonding.

[0023] The backrest sheet portion 120 may be bent so that the portion between the first side portion 120a and the second side portion 120b is convex in the Y' direction or in an oblique direction including components in the Y' direction and the Z' direction (see Figures 1A to 2D), or may be inclined in an oblique direction including components in the Y direction and the Z' direction from the first side portion 120a to the second side portion 120b (not shown), or may extend approximately in the Z-Z' direction (not shown).

[0024] At least one seat portion 100 further has a first portion S1 and a second portion S2. For example, at least one seat portion 100 can have the following configurations (1) and / or (2).

[0025] (1) The backrest sheet portion 120 of at least one seat portion 100 further has a first portion S1 and a second portion S2 (see FIGS. 1A to 2D). The first portion S1 of the backrest sheet portion 120 may be a part of the backrest sheet portion 120. For example, the first portion S1 of the backrest sheet portion 120 may be the first side portion 120a of the backrest sheet portion 120, or may be a part of the backrest sheet portion 120 on the Z'-direction side relative to the first side portion 120a. The second portion S2 of the backrest sheet portion 120 may be a part located on the Z'-direction side relative to the first portion S1 of the backrest sheet portion 120. When the backrest sheet portion 120 has an upper portion 121 and a lower portion 122, the first portion S1 of the backrest sheet portion 120 can be a part of the upper portion 121 or the lower portion 122, and the second portion S2 of the backrest sheet portion 120 can be a part of the lower portion 122 that is located on the Z'-direction side relative to the first portion S1. In FIGS. 1A to 2D, the first portion S1 of the backrest sheet portion 120 is the upper edge of the lower portion 122, and the second portion S2 of the backrest sheet portion 120 is the lower edge of the lower portion 122.

[0026] (2) The seat cushion portion 110 of at least one seat portion 100 further has a first portion S1 and a second portion S2 (see FIG. 3). The first portion S1 of the seat cushion portion 110 may be a part of the seat cushion portion 110. For example, the first portion S1 of the seat cushion portion 110 may be the first side portion 110a of the seat cushion portion 110, or may be a part of the seat cushion portion 110 on the Y'-direction side relative to the first side portion 110a. The second portion S2 of the seat cushion portion 110 may be a part located on the Y'-direction side relative to the first portion S1 of the seat cushion portion 110.

[0027] The chair C1 further includes at least one reinforcing sheet 200. The at least one reinforcing sheet 200 may be made of one or more layers of fabric (see FIGS. 1A to 3), or may be configured by connecting multiple parts made of one or more layers of fabric (not shown). The at least one reinforcing sheet 200 preferably has substantially the same tensile strength as the backrest sheet portion 120 and / or the seat portion 110, or a higher tensile strength than the backrest sheet portion 120 and / or the seat portion 110, but may have a lower tensile strength than the backrest sheet portion 120 and / or the seat portion 110. The tensile strength of the at least one seat portion 100 and the at least one reinforcing sheet 200 is preferably measured by a tensile strength test in accordance with JIS L 1096, but may also be measured by another test.

[0028] At least one reinforcing sheet 200 has a first connection portion 210 and a second connection portion 220. At least one reinforcing sheet 200 may further have a first side on the Z direction side or the Y direction side, a second side on the Z' direction side or the Y' direction side, a third side portion 230 on the X direction side, and a fourth side portion 240 on the X' direction side.

[0029] As described in (1) above, when the backrest sheet portion 120 has a first portion S1 and a second portion S2 (see FIGS. 1A to 2D ), at least one reinforcing sheet 200 includes a first reinforcing sheet 200 that reinforcing the backrest sheet portion 120. The first connecting portion 210 is a portion of the first reinforcing sheet 200 on the Z-direction side, and the second connecting portion 220 is a portion of the first reinforcing sheet 200 located on the Z'-direction side relative to the first connecting portion 210. For example, the first connecting portion 210 may be a first side portion of the first reinforcing sheet 200 on the Z-direction side, or may be a portion of the first side portion of the first reinforcing sheet 200 on the Z'-direction side, and the second connecting portion 220 may be a second side portion of the first reinforcing sheet 200 on the Z'-direction side relative to the second side portion of the first reinforcing sheet 200. The length dimension from the first connecting portion 210 to the second connecting portion 220 of the first reinforcing sheet 200 is approximately the same as or slightly larger than the dimension from the first portion S1 to the second portion S2 of the backrest sheet portion 120. The width dimension (dimension in the X-X' direction) of the portion between the first connecting portion 210 and the second connecting portion 220 of the first reinforcing sheet 200 may be approximately the same as, slightly smaller than, or slightly larger than the width dimension between the first portion S1 and the second portion S2 of the backrest sheet portion 120. The first connecting portion 210 and the second connecting portion 220 of the first reinforcing sheet 200 are connected to the first portion S1 and the second portion S2 of the backrest sheet portion 120. For example, the first connecting portion 210 and the second connecting portion 220 of the first reinforcing sheet 200 may be connected to the first portion S1 and the second portion S2 of the backrest sheet portion 120 by sewing, adhesive bonding, or thermocompression bonding. When the second connection portion 220 is the second side portion of the first reinforcing sheet 200 and the second portion S2 of the backrest sheet portion 120 is the second side portion 120b of the backrest sheet portion 120, the second connection portion 220, together with the second side portion 120b of the backrest sheet portion 120, is connected to the portion on the Y-direction side of the second side portion 110b of the seat cushion sheet portion 110 or the second side portion 110b of the seat cushion sheet portion 110. The first reinforcing sheet 200 is arranged along the portion from the first portion S1 to the second portion S2 on the rear or front surface of the backrest sheet portion 120. A first pocket P that is open in at least one of the X-direction and the X'-direction is provided between the first reinforcing sheet 200 and the backrest sheet portion 120.When a user sits on the chair C1 and a load is applied to the portion of the backrest sheet portion 120 from the first section S1 to the second section S2 and the first reinforcing sheet 200 from the Y direction or an oblique direction including components of the Y direction and the X direction, the first reinforcing sheet 200 comes into contact at least partially (entirely or partially) with the portion of the backrest sheet portion 120 from the first section S1 to the second section S2, forming a two-layer structure together with the backrest sheet portion 120. Therefore, the load can be borne not only by the backrest sheet portion 120 but also by the first reinforcing sheet 200.

[0030] When the first pocket P is open in either the X direction or the X' direction, it is preferable that either the third side 230 or the fourth side 240 of the first reinforcing sheet 200 is connected to the backrest sheet portion 120 (not shown). By connecting the middle portion of the first reinforcing sheet 200 to the backrest sheet portion 120, the first pocket P may be divided into an X-direction side pocket P that opens in the X direction, and an X'-direction side pocket P that opens in the X' direction (not shown). Because the first pocket P is open in at least one of the X direction or the X' direction, contents can be put in and taken out from at least one of the X direction or the X' direction.

[0031] The third side portion 230 of the first reinforcing sheet 200 may have a reinforcing portion 231 located between the first connecting portion 210 and the second connecting portion 220. The reinforcing portion 231 can be configured by hemming at least a portion of the third side portion 230 in the Z-Z' direction (for example, a portion of the third side portion 230 on the Z-direction side, a portion of the third side portion 230 on the Z'-direction side, or the entire third side portion 230), by sewing, adhering, or thermocompression bonding a piece of fabric separate from at least a portion of the third side portion 230 to at least a portion of the third side portion 230, or by embedding a reinforcing plate such as a resin plate or a metal plate in at least a portion of the third side portion 230.

[0032] The fourth side portion 240 of the first reinforcing sheet 200 may have a reinforcing portion 241 located between the first connecting portion 210 and the second connecting portion 220. The reinforcing portion 241 can be configured by hemming at least a portion of the fourth side portion 240 in the Z-Z' direction (for example, a portion of the fourth side portion 240 on the Z-direction side, a portion of the fourth side portion 240 on the Z'-direction side, or the entire fourth side portion 240), by sewing, adhering, or thermocompression bonding a piece of fabric separate from at least a portion of the fourth side portion 240 to at least a portion of the fourth side portion 240, or by embedding or fixing a reinforcing plate such as a resin plate or a metal plate in at least a portion of the fourth side portion 240.

[0033] When the third side 120c and the fourth side 120d of the backrest sheet portion 120 have reinforcing portions, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the first reinforcing sheet 200 extend along the reinforcing portion of the third side 120c and the reinforcing portion of the fourth side 120d of the backrest sheet portion 120. The reinforcing portion 231 of the third side 230 of the first reinforcing sheet 200 may be arranged on the X'-direction side or the X-direction side of the reinforcing portion of the third side 120c of the backrest sheet portion 120, or may be arranged so as to overlap the reinforcing portion of the third side 120c of the backrest sheet portion 120. The reinforcing portion 241 of the fourth side portion 240 of the first reinforcing sheet 200 may be arranged on the X-direction side or the X'-direction side of the reinforcing portion of the fourth side portion 120d of the backrest sheet portion 120, or may be arranged so as to overlap the reinforcing portion of the fourth side portion 120d of the backrest sheet portion 120. In Figures 1A to 2D, the third side portion 120c and the fourth side portion 120d of the lower part 122 of the backrest sheet portion 120 have reinforcing portions, and the reinforcing portions 231 and 241 extend along the reinforcing portion of the third side portion 120c and the reinforcing portion of the fourth side portion 120d, with the reinforcing portion 231 being arranged on the X'-direction side of the reinforcing portion of the third side portion 120c and the reinforcing portion 241 being arranged on the X-direction side of the reinforcing portion of the fourth side portion 120d.

[0034] When the third side 120c and the fourth side 120d of the backrest sheet portion 120 do not have reinforcing portions, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the first reinforcing sheet 200 extend along the third side 120c and the fourth side 120d of the backrest sheet portion 120. The reinforcing portion 231 of the third side 230 of the first reinforcing sheet 200 may be arranged on the X'-direction side or the X-direction side of the third side 120c of the backrest sheet portion 120, or may be arranged so as to overlap the third side 120c of the backrest sheet portion 120. The reinforcing portion 241 of the fourth side portion 240 of the first reinforcing sheet 200 may be positioned on the X-direction side or the X'-direction side of the fourth side portion 120d of the backrest sheet portion 120, or may be positioned so as to overlap the fourth side portion 120d of the backrest sheet portion 120.

[0035] The reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the first reinforcing sheet 200 may be omitted. In this case, the third side portion 230 and the fourth side portion 240 of the first reinforcing sheet 200 extend along the third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120. At least a portion of the third side portion 230 of the first reinforcing sheet 200 may be disposed on the X'-direction side or the X-direction side of the third side portion 120c of the backrest sheet portion 120, or may be disposed so as to overlap the third side portion 120c of the backrest sheet portion 120. At least a portion of the fourth side portion 240 of the first reinforcing sheet 200 may be disposed on the X-direction side or the X'-direction side of the fourth side portion 120d of the backrest sheet portion 120, or may be disposed so as to overlap the fourth side portion 120d of the backrest sheet portion 120.

[0036] The third side portion 230 and the fourth side portion 240 of the first reinforcing sheet 200 may further have a third connection portion 232 and a third connection portion 242 located between the first connection portion 210 and the second connection portion 220. The third connection portion 232 and the third connection portion 242 are portions on the Z′ direction side and / or the Z direction side of the reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the first reinforcing sheet 200, and are connected to the third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120. For example, the third connection portion 232 and the third connection portion 242 may be connected to the third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120 by sewing, gluing, or thermocompression bonding.

[0037] As described in (2) above, when the seating surface portion 110 has a first portion S1 and a second portion S2 (see FIG. 3 ), at least one reinforcing sheet 200 includes a second reinforcing sheet 200 that reinforces the seating surface portion 110. The first connecting portion 210 is a portion of the second reinforcing sheet 200 on the Y-direction side, and the second connecting portion 220 is a portion of the second reinforcing sheet 200 located on the Y′-direction side relative to the first connecting portion 210. For example, the first connecting portion 210 may be a first side portion of the second reinforcing sheet 200 on the Y-direction side, or may be a portion of the second reinforcing sheet 200 on the Y′-direction side relative to the first side, and the second connecting portion 220 may be a second side portion of the second reinforcing sheet 200 on the Y′-direction side, or may be a portion of the second reinforcing sheet 200 on the Y-direction side relative to the second side. The length dimension from the first connecting portion 210 to the second connecting portion 220 of the second reinforcing sheet 200 is approximately the same as or slightly larger than the dimension from the first portion S1 to the second portion S2 of the seating sheet portion 110. The width dimension (dimension in the X-X' direction) of the portion between the first connecting portion 210 and the second connecting portion 220 of the second reinforcing sheet 200 may be approximately the same as, slightly smaller than, or slightly larger than the width dimension between the first portion S1 and the second portion S2 of the seating sheet portion 110. The first connecting portion 210 and the second connecting portion 220 of the second reinforcing sheet 200 are connected to the first portion S1 and the second portion S2 of the seating sheet portion 110. For example, the first connecting portion 210 and the second connecting portion 220 of the second reinforcing sheet 200 may be connected to the first portion S1 and the second portion S2 of the seating sheet portion 110 by sewing, adhesive bonding, or thermocompression bonding. The second reinforcing sheet 200 is disposed along the portion from the first section S1 to the second section S2 on the underside or top side of the seating surface portion 110. A second pocket P that is open in at least one of the X and X' directions is provided between the second reinforcing sheet 200 and the seating surface portion 110. When a user sits on the chair C1 and a load is applied from the Z direction to the portion of the seating surface portion 110 from the first section S1 to the second section S2 and to the second reinforcing sheet 200, the second reinforcing sheet 200 comes into contact at least partially (entirely or partially) with the portion of the seating surface portion 110 from the first section S1 to the second section S2, forming a two-layer structure together with the seating surface portion 110. Therefore, the load can be borne not only by the seating surface portion 110 but also by the second reinforcing sheet 200.

[0038] When the second pocket P is open in either the X direction or the X' direction, it is preferable that either the third side 230 or the fourth side 240 of the second reinforcing sheet 200 is connected to the seating surface portion 110 (not shown). By connecting the middle portion of the second reinforcing sheet 200 to the seating surface portion 110, the second pocket P may be divided into an X-direction side pocket P that opens in the X direction, and an X'-direction side pocket P that opens in the X' direction (not shown). Because the second pocket P is open in at least one of the X direction or the X' direction, contents can be put in and taken out from at least one of the X direction or the X' direction.

[0039] The third side portion 230 of the second reinforcing sheet 200 may have a reinforcing portion 231 located between the first connecting portion 210 and the second connecting portion 220. The reinforcing portion 231 of the third side portion 230 of the second reinforcing sheet 200 can be configured by hemming at least a portion of the third side portion 230 in the Y-Y' direction (for example, a portion of the third side portion 230 on the Y'-direction side, a portion of the third side portion 230 on the Y-direction side, or the entire third side portion 230), by sewing, adhering, or thermocompression bonding a piece of fabric separate from at least a portion of the third side portion 230 to at least a portion of the third side portion 230, or by embedding a reinforcing plate such as a resin plate or a metal plate in at least a portion of the third side portion 230.

[0040] The fourth side portion 240 of the second reinforcing sheet 200 may have a reinforcing portion 241 located between the first connecting portion 210 and the second connecting portion 220. The reinforcing portion 241 of the fourth side portion 240 of the second reinforcing sheet 200 can be configured by hemming at least a portion of the fourth side portion 240 in the Y-Y' direction (for example, a portion of the fourth side portion 240 on the Y-direction side, a portion of the fourth side portion 240 on the Y'-direction side, or the entire fourth side portion 240), by sewing, adhering, or thermocompression bonding a piece of fabric separate from at least a portion of the fourth side portion 240 to at least a portion of the fourth side portion 240, or by embedding or fixing a reinforcing plate such as a resin plate or a metal plate in at least a portion of the fourth side portion 240.

[0041] When the third side 110c and the fourth side 110d of the seating surface portion 110 have reinforcing portions, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the second reinforcing sheet 200 extend along the reinforcing portion of the third side 110c and the reinforcing portion of the fourth side 110d of the seating surface portion 110. The reinforcing portion 231 of the third side 230 of the second reinforcing sheet 200 may be arranged on the X'-direction side or the X-direction side of the reinforcing portion of the third side 110c of the seating surface portion 110, or may be arranged so as to overlap the reinforcing portion of the third side 110c of the seating surface portion 110. The reinforcing portion 241 of the fourth side portion 240 of the second reinforcing sheet 200 may be arranged on the X-direction side or the X'-direction side of the reinforcing portion of the fourth side portion 110d of the seating surface portion 110, or may be arranged so as to overlap the reinforcing portion of the fourth side portion 110d of the seating surface portion 110. In Fig. 3, the third side portion 110c and the fourth side portion 110d of the seating surface portion 110 have reinforcing portions, and the reinforcing portions 231 and 241 extend along the reinforcing portion of the third side portion 110c and the reinforcing portion of the fourth side portion 110d, with the reinforcing portion 231 being arranged on the X'-direction side of the reinforcing portion of the third side portion 120c and the reinforcing portion 241 being arranged on the X-direction side of the reinforcing portion of the fourth side portion 120d.

[0042] When the third side 110c and the fourth side 110d of the seating surface portion 110 do not have a reinforcing portion, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the second reinforcing sheet 200 extend along the third side 110c and the fourth side 110d of the seating surface portion 110. The reinforcing portion 231 of the third side 230 of the second reinforcing sheet 200 may be disposed on the X' direction side or the X direction side of the third side 110c of the seating surface portion 110, or may be disposed so as to overlap the third side 110c of the seating surface portion 110. The reinforcing portion 241 of the fourth side 240 of the second reinforcing sheet 200 may be disposed on the X direction side or the X' direction side of the fourth side 110d of the seating surface portion 110, or may be disposed so as to overlap the fourth side 110d of the seating surface portion 110.

[0043] The reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the second reinforcing sheet 200 may be omitted. In this case, the third side portion 230 and the fourth side portion 240 of the second reinforcing sheet 200 extend along the third side portion 110c and the fourth side portion 110d of the seating surface portion 110. At least a portion of the third side portion 230 of the second reinforcing sheet 200 may be disposed on the X' direction side or the X direction side of the third side portion 110c of the seating surface portion 110, or may be disposed so as to overlap the third side portion 110c of the seating surface portion 110. At least a portion of the fourth side portion 240 of the second reinforcing sheet 200 may be disposed on the X direction side or the X' direction side of the fourth side portion 110d of the seating surface portion 110, or may be disposed so as to overlap the fourth side portion 110d of the seating surface portion 110.

[0044] When the third side portion 230 and the fourth side portion 240 of the second reinforcing sheet 200 further have a third connecting portion 232 and a third connecting portion 242, the third connecting portion 232 and the third connecting portion 242 are portions on the Y′ direction side and / or Y direction side of the reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the second reinforcing sheet 200, and are connected to the third side portion 110c and the fourth side portion 110d of the seating surface portion 110. For example, the third connecting portion 232 and the third connecting portion 242 may be connected to the third side portion 110c and the fourth side portion 110d of the seating surface portion 110 by sewing, gluing, or thermocompression bonding.

[0045] When the reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of at least one reinforcing sheet 200 are omitted, the third connecting portion 232 and the third connecting portion 242 can have any of the configurations described above, except that they are a part between the first connecting portion 210 and the second connecting portion 220 of the third side portion 230 and the fourth side portion 240 of at least one reinforcing sheet 200. Note that the third connecting portion 232 and / or the third connecting portion 242 can be omitted.

[0046] The chair C1 further includes a leg portion 300 that supports at least one seat portion 100. The leg portion 300 includes a first leg portion 310 and a second leg portion 320.

[0047] The first leg portion 310 supports the seat cushion portion 110 of at least one seat portion 100. For example, the first leg portion 310 has four or more X-shaped legs 311, four or more upper pivot support portions 312, and four or more lower pivot support portions 313. Each of the four or more X-shaped legs 311 has first and second poles that intersect in an X shape and an axle that rotatably connects the intersection of the first and second poles, and the first and second poles can be opened and closed freely around the axle. When the first and second poles are open, each X-shaped leg 311 is X-shaped, and when the first and second poles are closed, each X-shaped leg 311 is approximately I-shaped. The four or more X-shaped legs 311 are arranged in a polygonal ring shape. The four or more upper rotating support parts 312 rotatably support the upper end of the first pole of adjacent X-shaped legs 311 of the four or more X-shaped legs 311 and the upper end of the second pole of another X-shaped leg 311. The four or more lower rotating support parts 313 rotatably support the lower end of the first pole of adjacent X-shaped legs 311 of the four or more X-shaped legs 311 and the lower end of the second pole of another X-shaped leg 311. The four or more upper rotating support parts 312 are fixed to four or more corners of the seating surface portion 110 from the Z' direction side and support the seating surface portion 110 in the unfolded state.

[0048] The second leg 320 supports the backrest sheet portion 120 of at least one seat portion 100. For example, the second leg 320 has a pair of backrest support poles 321. The pair of backrest support poles 321 extend in the Z direction from a lower rotation support portion 313 that rotatably supports the lower ends of the first and second poles of the X-shaped leg 311 located on the Y'-direction side of the four or more X-shaped legs 311, through an upper rotation support portion 312 that rotatably supports the upper ends of the second and first poles of the X-shaped leg 311 located on the Y'-direction side. The upper ends of the pair of backrest support poles 321 are inserted into insertion portions 121c, 121d of the backrest sheet portion 120 and support the backrest sheet portion 120 in the unfolded state. When the backrest sheet portion 120 has an upper portion 121 and a lower portion 122, the pair of backrest support poles 321 are inserted into the insertion portions 121c, 121d of the upper portion 121 to support the upper portion 121 but not the lower portion 122.

[0049] The leg section 300 further includes a pair of handrail support poles 330 and a pair of handrails 340. The pair of handrail support poles 330 extend in the Z direction from a lower pivot support section 313 that rotatably supports the lower ends of the first and second poles of the X-shaped leg 311 located on the Y-direction side of the four or more X-shaped legs 311, through an upper pivot support section 312 that rotatably supports the upper ends of the second and first poles of the X-shaped leg 311 located on the Y-direction side. The pair of handrails 340 are suspended from the upper ends of the pair of handrail support poles 330 and a pair of backrest support poles 321. The pair of handrail support poles 330 and the pair of handrails 340 may be omitted.

[0050] The above-described chair C1 has the following technical features and effects.

[0051] When the first reinforcing sheet 200 is provided, the first connection portion 210 and the second connection portion 220 of the first reinforcing sheet 200 are connected to the backrest sheet portion 120 and the first reinforcing sheet 200 is arranged along the backrest sheet portion 120, so that a first pocket P can be formed between the first reinforcing sheet 200 and the backrest sheet portion 120 and the backrest sheet portion 120 can be reinforced by the first reinforcing sheet 200.

[0052] When the first connecting portion 210 and the second connecting portion 220 of the first reinforcing sheet 200 are connected to the first portion S1 of the upper portion 121 or the lower portion 122 of the backrest sheet portion 120 and the second portion S2 of the lower portion 122, the first reinforcing sheet 200 is arranged along the portion from the first portion S1 to the second portion S2 of the backrest sheet portion 120 (which may or may not include the lower portion 122). Thus, the first reinforcing sheet 200 can reinforce the lower portion 122 that is not supported by the leg portions 300.

[0053] When the third side portion 230 and the fourth side portion 240 of the first reinforcing sheet 200 have reinforcing portions 231 and 241, the reinforcing portions 231 and 241 extend along the third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120 (which may or may not have reinforcing portions), so that the tensile strength of the first reinforcing sheet 200 is improved in the direction in which the first connection portion 210 and the second connection portion 220 move away from each other, and as a result, the tensile strength of the backrest sheet portion 120 in the same direction is also improved.

[0054] When the third side 230 and the fourth side 240 of the first reinforcing sheet 200 have the third connecting portion 232 and the third connecting portion 242, the third connecting portion 232 and the third connecting portion 242 are connected to a part of the third side 120c and the fourth side 120d of the backrest sheet portion 120. In other words, since the openings on the X-direction side and the X'-direction side of the first pocket P are partially blocked, contents are less likely to fall out of the first pocket P.

[0055] When at least a portion of the third side 230 and the fourth side 240 of the first reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) is located on the X' direction side or X direction side of the third side 120c and the fourth side 120d of the backrest sheet portion 120, at least a portion of the third side 230 and the fourth side 240 of the first reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) and the third side 120c and the fourth side 120d of the backrest sheet portion 120 are misaligned in the X-X' direction, making it easier to insert contents into the first pocket P from the misaligned location.

[0056] When the second reinforcing sheet 200 is provided, the first connection portion 210 and the second connection portion 220 of the second reinforcing sheet 200 are connected to the seating surface portion 110 and the second reinforcing sheet 200 is arranged along the seating surface portion 110, so that a second pocket P can be formed between the second reinforcing sheet 200 and the seating surface portion 110 and the second reinforcing sheet 200 can reinforce the seating surface portion 110.

[0057] When the third side portion 230 and the fourth side portion 240 of the second reinforcing sheet 200 have reinforcing portions 231 and 241, the reinforcing portions 231 and 241 extend along the third side portion 110c and the fourth side portion 110d of the seating surface portion 110 (which may or may not have reinforcing portions), so that the tensile strength of the second reinforcing sheet 200 is improved in the direction in which the first connection portion 210 and the second connection portion 220 move away from each other, and as a result, the tensile strength of the seating surface portion 110 is also improved in the same direction.

[0058] When the third side 230 and the fourth side 240 of the second reinforcing sheet 200 have the third connecting portion 232 and the third connecting portion 242, the third connecting portion 232 and the third connecting portion 242 are connected to a part of the third side 110c and the fourth side 110d of the seating sheet portion 110. In other words, since the openings on the X-direction side and the X'-direction side of the second pocket P are partially blocked, contents are less likely to fall out of the second pocket P.

[0059] When at least a portion of the third side 230 and the fourth side 240 of the second reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) is located on the X' direction side or the X direction side of the third side 110c and the fourth side 110d of the seating surface portion 110, at least a portion of the third side 230 and the fourth side 240 of the second reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) and the third side 120c and the fourth side 110d of the seating surface portion 110 are misaligned in the X-X' direction, making it easier to insert contents into the second pocket P from the misaligned location. [Example]

[0060] Hereinafter, a chair C2 according to a second embodiment of the present invention and several other embodiments, including design modifications thereof, will be described with reference to Figures 4A to 5C. Figures 4A to 5D show chair C2 according to the second embodiment. Figures 4A and 4B also show the Z-Z', Y-Y', and X-X' directions, as in Figures 1A and 1B.

[0061] Chair C2 has the same configuration as chair C1, except that the configuration of at least one seat portion 100' of chair C2 is different from the configuration of at least one seat portion 100 of chair C1, and that its leg portion 300' is different from the configuration of the leg portion 300 of chair C1. These differences will be described in detail below, and any explanation of chair C2 that overlaps with the explanation of chair C1 will be omitted.

[0062] At least one seat portion 100' may be a single flexible sheet made of one or more layers of fabric (see FIGS. 4A to 5D), or may be configured by connecting multiple parts made of one or more layers of fabric (not shown). At least one seat portion 100' has a seat portion 110' and a back portion 120'. The seat portion 110' is a portion of at least one seat portion 100' on the Z' direction side, which forms the seat portion of the chair C2 when at least one seat portion 100' is supported by legs 300'. The back portion 120' is a portion of at least one seat portion 100' on the Z direction side of the seat portion 110', which forms the back portion of the chair C2 when at least one seat portion 100' is supported by legs 300'. The backrest sheet portion 120' may have an upper portion 121' and a lower portion 122' having a dimension in the X-X' direction smaller than the dimension in the X-X' direction of the upper portion 121', but is not limited to this. For example, the dimension in the X-X' direction of the backrest sheet portion 120' may be approximately uniform from the first side portion 120a to the seat cushion sheet portion 110', or may gradually decrease or increase.

[0063] Because at least one seat portion 100' is thus configured from a single flexible sheet, the backrest sheet portion 120' does not have a second side portion 120b, and the sitting surface sheet portion 110' does not have a second side portion 110b. The third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120' are provided with downwardly opening insertion portions 121c and 121d. The third side portion 120c and the fourth side portion 120d of the backrest sheet portion 120' may further be provided with sleeves 122c and 122d. The sleeves 122c and 122d are positioned on the Z' direction side relative to the insertion portions 121c and 121d. The sleeves 122c and 122d may be omitted.

[0064] At least one sheet member 100' and at least one reinforcing sheet 200 further have at least one of the following configurations (A) to (C).

[0065] (A) At least one backrest sheet portion 120′ of the seat portion 100′ has the same configuration as the backrest sheet portion 120 of (1) above. In this case, at least one reinforcing sheet 200 includes the first reinforcing sheet 200.

[0066] (B) At least one seating surface portion 110′ of the seat portion 100′ has the same configuration as the seating surface portion 110 of (2) above. In this case, at least one reinforcing sheet 200 includes the second reinforcing sheet 200.

[0067] (C) The backrest sheet portion 120' of at least one seat portion 100' further has a first portion S1, and the sitting surface sheet portion 110' of at least one seat portion 100' further has a second portion S2 (see FIGS. 4A to 5D). The first portion S1 of the backrest sheet portion 120' may be a part of the backrest sheet portion 120'. For example, the first portion S1 of the backrest sheet portion 120' may be the first side portion 120a of the backrest sheet portion 120', or may be a part of the backrest sheet portion 120' on the Z' direction side relative to the first side portion 120a. The second portion S2 of the sitting surface sheet portion 110' may be a part located on the Z' direction side relative to the first portion S1 of the sitting surface sheet portion 110'. The second portion S2 of the seating surface portion 110' may be a portion on the Y'-direction side of the seating surface portion 110', or may be a portion on the Y-direction side of the seating surface portion 110'.

[0068] In this case, at least one reinforcing sheet 200 includes a third reinforcing sheet 200 (see FIGS. 4A to 5D). The first connection portion 210 is a portion of the third reinforcing sheet 200 on the Z-direction side, and the second connection portion 220 is a portion of the third reinforcing sheet 200 located on the Z'-direction side relative to the first connection portion 210. For example, the first connection portion 210 may be a first side portion of the third reinforcing sheet 200 on the Z-direction side, or may be a portion of the third reinforcing sheet 200 on the Z'-direction side relative to the first side, and the second connection portion 220 may be a second side portion of the third reinforcing sheet 200 on the Z'-direction side relative to the second side of the third reinforcing sheet 200. The length dimension from the first connecting portion 210 to the second connecting portion 220 of the third reinforcing sheet 200 is approximately the same as or slightly larger than the dimension from the first portion S1 of the backrest sheet portion 120' to the second portion S2 of the sitting surface sheet portion 110' (i.e., the dimension from the first portion S1 to the second portion S2 of at least one seat portion 100'). The width dimension (dimension in the X-X' direction) of the portion between the first connecting portion 210 and the second connecting portion 220 of the third reinforcing sheet 200 may be approximately the same as, slightly smaller than, or slightly larger than the width dimension between the first portion S1 and the second portion S2 of at least one seat portion 100'. The first connecting portion 210 and the second connecting portion 220 of the third reinforcing sheet 200 are connected to the first portion S1 and the second portion S2 of the backrest sheet portion 120'. For example, the first connecting portion 210 and the second connecting portion 220 of the third reinforcing sheet 200 may be connected to the first portion S1 of the backrest sheet portion 120 and the second portion S2 of the seating surface sheet portion 110' by sewing, gluing, or thermocompression bonding. The third reinforcing sheet 200 is arranged along the portion from the first portion S1 to the second portion S2 on the rear or front surface of the backrest sheet portion 120' and the seating surface sheet portion 110' (at least one seat portion 100'). A third pocket P that is open in at least one of the X direction and the X' direction is provided between the third reinforcing sheet 200 and the at least one seat portion 100'.When a user sits on the chair C2 and a load is applied from the Y direction, an oblique direction including components of the Y and X directions, or the Z direction to the portion from the first section S1 to the second section S2 of at least one seat portion 100' and the third reinforcing sheet 200, the third reinforcing sheet 200 comes into contact at least partially (entirely or partially) with the portion from the first section S1 to the second section S2 of at least one seat portion 100', forming a two-layer structure together with the at least one seat portion 100'. Therefore, the load can be borne not only by the at least one seat portion 100' but also by the third reinforcing sheet 200.

[0069] In addition, when the third pocket P is open in either the X direction or the X' direction, it is preferable that either the third side 230 or the fourth side 240 of the third reinforcing sheet 200 is connected to at least one sheet portion 100' (not shown). By connecting the middle portion of the third reinforcing sheet 200 to at least one sheet portion 100', the third pocket P may be divided into an X-direction side pocket P that opens in the X direction and an X'-direction side pocket P that opens in the X' direction (see FIGS. 4B and 5C). Because the third pocket P is open in at least one of the X direction or the X' direction, contents can be put in and taken out from at least one of the X direction or the X' direction.

[0070] The third side portion 230 of the third reinforcing sheet 200 may have a reinforcing portion 231 located between the first connection portion 210 and the second connection portion 220. The reinforcing portion 231 of the third side portion 230 of the third reinforcing sheet 200 may have a reinforcing portion 241 located between the first connection portion 210 and the second connection portion 220. The reinforcing portion 241 of the fourth side portion 24 ...

[0071] When the third side 110c of the seat cushion sheet portion 110' and the third side 120c of the backrest sheet portion 120' (the third side of at least one seat portion 100') have a reinforcing portion and the fourth side 110d of the seat cushion sheet portion 110' and the fourth side 120d of the backrest sheet portion 120' (the fourth side of at least one seat portion 100') have a reinforcing portion, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the third reinforcing sheet 200 extend along the reinforcing portion of the third side and the reinforcing portion of the fourth side of at least one seat portion 100'. The reinforcing portion 231 of the third side 230 of the third reinforcing sheet 200 may be arranged on the X' direction side or the X direction side of the reinforcing portion of the third side of at least one seat portion 100', or may be arranged so as to overlap the reinforcing portion of the third side of at least one seat portion 100'. The reinforcing portion 241 of the fourth side portion 240 of the third reinforcing sheet 200 may be arranged on the X-direction side or the X'-direction side of the reinforcing portion of the fourth side portion of at least one sheet portion 100', or may be arranged so as to overlap the reinforcing portion of the fourth side portion of at least one sheet portion 100'.

[0072] When the third side 110c of the seat cushion sheet portion 110' and the third side 120c of the backrest sheet portion 120' (the third side of at least one seat portion 100') have a reinforcing portion and the fourth side 110d of the seat cushion sheet portion 110' and the fourth side 120d of the backrest sheet portion 120' (the fourth side of at least one seat portion 100') do not have a reinforcing portion, the reinforcing portion 231 of the third side 230 and the reinforcing portion 241 of the fourth side 240 of the third reinforcing sheet 200 extend along the third side and fourth side of at least one seat portion 100'. The reinforcing portion 231 of the third side 230 of the third reinforcing sheet 200 may be arranged on the X' direction side or the X direction side of the third side of at least one seat portion 100', or may be arranged so as to overlap the third side of at least one seat portion 100'. The reinforcing portion 241 of the fourth side portion 240 of the third reinforcing sheet 200 may be arranged on the X-direction side or the X'-direction side of the fourth side portion of at least one sheet portion 100', or may be arranged so as to overlap the fourth side portion of at least one sheet portion 100'.

[0073] The reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the third reinforcing sheet 200 may be omitted. In this case, the third side portion 230 and the fourth side portion 240 of the third reinforcing sheet 200 extend along the third side portion and the fourth side portion of at least one sheet portion 100′. The reinforcing portion 231 of the third side portion 230 of the third reinforcing sheet 200 may be disposed on the X′-direction side or the X-direction side of the third side portion of at least one sheet portion 100′, or may be disposed so as to overlap the third side portion of at least one sheet portion 100′. The reinforcing portion 241 of the fourth side portion 240 of the third reinforcing sheet 200 may be disposed on the X-direction side or the X′-direction side of the fourth side portion of at least one sheet portion 100′, or may be disposed so as to overlap the fourth side portion of at least one sheet portion 100′.

[0074] The third side portion 230 and the fourth side portion 240 of the third reinforcing sheet 200 may further have a third connection portion 232 and a third connection portion 242 located between the first connection portion 210 and the second connection portion 220. The third connection portion 232 and the third connection portion 242 are portions on the Z' direction side and / or Z direction side of the reinforcing portion 231 of the third side portion 230 and the reinforcing portion 241 of the fourth side portion 240 of the third reinforcing sheet 200, and are connected to the third side portion and the fourth side portion of at least one sheet portion 100'. For example, the third connection portion 232 and the third connection portion 242 may be connected to the third side portion and the fourth side portion of at least one sheet portion 100' by sewing, gluing, or thermocompression bonding.

[0075] The leg section 300' supports at least one seat section 100'. The leg section 300' has two X-shaped legs 310', a pair of first rotation support sections 321' on the Y' direction side, a pair of first rotation support sections 322' on the Y direction side, a pair of second rotation support sections 331' on the Y' direction side, a pair of second rotation support sections 332' on the Y direction side, a pair of inclined legs 340', a pair of seat support poles 350', and a pair of rear support legs 360'.

[0076] Each of the two X-shaped legs 310' has first and second poles that intersect in an X-shape and a shaft that rotatably connects the intersection of the first and second poles, allowing the first and second poles to open and close freely around the shaft. When the first and second poles are open, each X-shaped leg 310' is X-shaped, and when the first and second poles are closed, each X-shaped leg 310' is approximately I-shaped. The two X-shaped legs 310' are arranged opposite each other in the Y-Y' direction and include an X-shaped leg 310' on the Y-direction side and an X-shaped leg 310' on the Y'-direction side.

[0077] The pair of inclined legs 340' are arranged on the X-direction side and X'-direction side of the two X-shaped legs 310', and extend in an oblique direction including components in the Y' direction and Z direction, passing near the lower ends of the first and second poles of the X-shaped leg 310' on the Y-direction side, to the upper ends of the second and first poles of the X-shaped leg 310' on the Y'-direction side.

[0078] The pair of rear support legs 360' extend in the Z-Z' direction and are disposed on the X- and X'-direction sides of the X-shaped legs 310' on the Y'-direction side. The upper ends of the pair of rear support legs 360' are inserted into the insertion portions 121c, 121d of the backrest sheet portion 120' of at least one seat portion 100' and support the backrest sheet portion 120' in the unfolded state. If sleeves 122c, 122d are provided on the backrest sheet portion 120', the pair of rear support legs 360' are inserted through the sleeves 122c, 122d. When the backrest seat portion 120' has an upper portion 121 and a lower portion 122, the pair of rear support legs 360' are inserted into the insert portions 121c, 121d of the upper portion 121, or into the insert portions 121c, 121d of the upper portion 121 and the sleeves 122c, 122d, to support the upper portion 121 but not the lower portion 122.

[0079] The pair of first pivotal support parts 321' on the Y' direction side are supported at the middle parts of the pair of rear support legs 360' so as to be vertically movable, and pivotally support the upper ends of the pair of inclined legs 340', as well as pivotally support the upper ends of the second pole and the first pole of the Y' direction-side X-shaped leg 310'. The pair of second pivotal support parts 331' on the Y' direction side are pivotally attached to the lower ends of the pair of rear support legs 360', and pivotally support the lower ends of the first pole and the second pole of the Y' direction-side X-shaped leg 310'.

[0080] A pair of second pivot support portions 332' on the Y-direction side are rotatably attached to the lower ends of a pair of inclined legs 340' and rotatably support the lower ends of the first pole and the second pole of the X-shaped leg 310' on the Y-direction side.

[0081] The pair of seat support poles 350' are arranged on the X'-direction side and X-direction side of the pair of inclined legs 340' and the pair of rear support legs 360', are rotatably supported by the pair of inclined legs 340' and the pair of rear support legs 360', and extend in the Y direction from near the pair of rear support legs 360' beyond the pair of inclined legs 340'. The pair of seat support poles 350' support a third side 110c and a fourth side 110d of the seat portion 110' of at least one seat unit 100' so that the seat portion 110' is in an unfolded state.

[0082] A pair of first rotation support portions 322' on the Y direction side are supported rotatably in the Y-Y' direction by portions of the pair of seat support poles 350' on the Y direction side relative to the pivotal support portions of the pair of inclined legs 340'. The pair of first rotation support portions 322' rotatably support the upper ends of the second and first poles of the X-shaped leg 310' on the Y direction side.

[0083] The leg 300' may further have a pair of third pivot support portions 371' on the Y'-direction side, a pair of third pivot support portions 372' on the Y-direction side, a pair of handrail support poles 380', and a pair of handrails 390'.

[0084] The pair of third pivotal support portions 371' on the Y' direction side are fixed to the Z' direction side portions of the pair of rear support legs 360' relative to the pair of first pivotal support portions 321' and rotatably support the rear end portions of the pair of handrails 390'.

[0085] The pair of third pivotal support portions 372' on the Y-direction side are slidably supported on the Z-direction side of the pair of inclined legs 340' relative to the pair of second pivotal support portions 332', and rotatably support the lower ends of the pair of handrail support poles 380'.

[0086] The pair of handrail support poles 380' extend in the Z direction from the pair of third pivot supports 372' on the Y direction side, passing through the pair of first pivot supports 322' on the Y direction side. The upper ends of the pair of handrail support poles 380' are pivotally connected to the front ends of the pair of handrails 390'. Note that the pair of third pivot supports 371' on the Y' direction side, the pair of third pivot supports 372' on the Y direction side, the pair of handrail support poles 380' and the pair of handrails 390' can be omitted.

[0087] The above-described chair C2 has the following technical features and effects.

[0088] When the first reinforcing sheet 200 of the chair C2 is provided, the chair C2 exhibits the same technical features and effects as those of the chair C1 when the first reinforcing sheet 200 is provided.

[0089] When the second reinforcing sheet 200 of the chair C2 is provided, the chair C2 exhibits the same technical features and effects as those of the chair C1 when the second reinforcing sheet 200 is provided.

[0090] When the third reinforcing sheet 200 of chair C2 is provided, the first connection portion 210 and the second connection portion 220 of the third reinforcing sheet 200 are connected to at least one seat portion 100' and the third reinforcing sheet 200 is arranged along at least one seat portion 100', so that a third pocket P can be formed between the third reinforcing sheet 200 and at least one seat portion 100' and the third reinforcing sheet 200 can reinforce at least one seat portion 100'.

[0091] When the first connecting portion 210 and the second connecting portion 220 of the third reinforcing sheet 200 are connected to the first portion S1 of the upper portion 121 or lower portion 122 of the backrest sheet portion 120' of at least one seat portion 100' and the second portion S2 of the sitting surface sheet portion 110', the third reinforcing sheet 200 is arranged along at least one portion from the first portion S1 to the second portion S2 (which may or may not include the lower portion 122). Thus, the second reinforcing sheet 200 can reinforce the lower portion 122 that is not supported by the leg portions 300'.

[0092] When the third side portion 230 and the fourth side portion 240 of the third reinforcing sheet 200 have reinforcing portions 231 and 241, the reinforcing portions 231 and 241 extend along the third side portion and the fourth side portion (which may or may not have reinforcing portions) of at least one sheet portion 100', so that the tensile strength of the third reinforcing sheet 200 is improved in the direction in which the first connection portion 210 and the second connection portion 220 move away from each other, and as a result, the tensile strength of at least one sheet portion 100' in the same direction is also improved.

[0093] When the third side 230 and the fourth side 240 of the second reinforcing sheet 200 have the third connecting portion 232 and the third connecting portion 242, the third connecting portion 232 and the third connecting portion 242 are connected to a part of the third side and the fourth side of at least one sheet portion 100'. In other words, since the openings on the X-direction side and the X'-direction side of the third pocket P are partially blocked, the contents are less likely to fall out of the third pocket P.

[0094] When at least a portion of the third side 230 and fourth side 240 of the third reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) is located on the X' direction side or X direction side of the third side and fourth side of at least one sheet portion 100', at least a portion of the third side 230 and fourth side 240 of the third reinforcing sheet 200 (which may or may not have reinforcing portions 231, 241) and the third side and fourth side of at least one sheet portion 100' are misaligned in the X-X' direction, making it easier to insert contents into the third pocket P from the misaligned location.

[0095] The chair described above is not limited to the above embodiment, and can be modified in any way within the scope of the claims.

[0096] At least one seat portion 100 may have a seat cushion portion 110 but not a backrest portion 120, or may have a backrest portion 120 but not a seat cushion portion 110. In the former case, a backrest plate supported by a pair of backrest support poles 321 of the second leg portion 320 may be provided instead of the seat cushion portion 110, or the backrest portion 120 and the second leg portion 320 may be omitted. In the latter case, a seat cushion plate or the like supported by the first leg portion 310 may be provided instead of the seat cushion portion 110.

[0097] The seating surface portion 110 can be a flexible sheet, such as a substantially circular shape (not shown) when viewed from the Z direction. In this case, the first side 110a of the seating surface portion 110 is the edge of the seating surface portion 110 on the Y direction side, the second side 110b of the seating surface portion 110 is the edge of the seating surface portion 110 on the Y' direction side, the third side 110c of the seating surface portion 110 is the edge of the seating surface portion 110 on the X direction side, and the fourth side 110d of the seating surface portion 110 is the edge of the seating surface portion 110 on the X' direction side.

[0098] The backrest sheet portion 120 can be a flexible sheet that is approximately circular when viewed from the Y direction. In this case, the first side 120a of the backrest sheet portion 120 is the edge of the backrest sheet portion 120 on the Z direction side, the second side 120b of the backrest sheet portion 120 is the edge of the backrest sheet portion 120 on the Z' direction side, the third side 120c of the backrest sheet portion 120 is the edge of the backrest sheet portion 120 on the X direction side, and the fourth side 120d of the backrest sheet portion 120 is the edge of the backrest sheet portion 120 on the X' direction side.

[0099] When backrest sheet portion 120 or 120' has upper portion 121 and lower portion 122, upper portion 121 may be a portion supported by leg portion 300 or 300', and lower portion 122 may be a portion not supported by leg portion 300 or 300'. Therefore, the dimension of lower portion 122 in the X-X' direction may be approximately the same as or larger than the dimension of upper portion 121 in the X-X' direction.

[0100] The legs of the present invention may be legs of a chair that supports at least one seat 100 or 100'. For example, the legs 300 may be configured to support at least one seat 100', or the legs 300 may be configured to support at least one seat 100.

[0101] The reinforcing sheet of the present invention does not reinforce at least one of the sheet portions 100, 100' described above, but can be a sheet that forms a pocket P together with at least one of the sheet portions 100, 100' described above. This sheet has the same configuration as any of the reinforcing sheets 200 described above, except that it does not have the tensile strength etc. that can reinforce at least one of the sheet portions 100, 100'. [Explanation of symbols]

[0102] C1, C2: Chairs 100, 100': at least one sheet part 110, 110': seating surface portion 110a: first side portion of seating surface portion, 110b: second side portion of seating surface portion 110c: third side portion of seating surface portion 110d: fourth side portion of seating surface portion 120, 120': backrest seat portion 120a: first side portion of backrest seat portion 120b: second side portion of backrest seat portion 120c: third side portion of backrest seat portion 120d: fourth side portion of backrest seat portion 121, 121': upper portion of backrest seat portion 122, 122': lower portion S1: First part of at least one seat part S2: Second part of at least one seat part 200: Reinforcement sheet 210: First connecting portion 220: Second connecting portion 230: Third side portion 231: Reinforcement portion 232: Third connecting portion 240: Fourth side portion 241: Reinforcement portion 242: Third connecting portion P: Pocket 300, 300': Legs

Claims

1. At least one flexible seat portion having at least one of a backrest seat portion and a seat surface seat portion; A reinforcing sheet; and a leg portion supporting the at least one seat portion, the reinforcing sheet is disposed along the at least one sheet portion, and has a first connection portion which is a portion of the reinforcing sheet on one side in a first direction or one side in a second direction and is connected to the at least one sheet portion, and a second connection portion which is a portion of the reinforcing sheet located on the other side in the first direction or the other side in the second direction with respect to the first connection portion and is connected to the at least one sheet portion; and a pocket which opens to at least one of one side in a third direction and the other side in the third direction is provided between the reinforcing sheet and the at least one sheet portion, A chair in which the first direction is an up-down direction, the second direction is a front-to-back direction, and the third direction is a direction approximately perpendicular to the first direction and the second direction.

2. 2. The chair of claim 1, the at least one sheet portion further includes a third side portion on one side in the third direction and a fourth side portion on the other side in the third direction, the reinforcing sheet further has a third side portion on one side in the third direction and a fourth side portion on the other side in the third direction, the third side portion and the fourth side portion of the reinforcing sheet have a reinforcing portion located between the first connection portion and the second connection portion of the reinforcing sheet, A chair, wherein the reinforcing portion of the third side portion and the reinforcing portion of the fourth side portion of the reinforcing sheet extend along the third side portion and the fourth side portion of the at least one seat portion.

3. 3. The chair according to claim 2, the third side portion and the fourth side portion of the reinforcing sheet further include a third connection portion located between the first connection portion and the second connection portion of the reinforcing sheet, when the first connection portion of the reinforcing sheet is a portion on one side of the reinforcing sheet in the first direction and the second connection portion of the reinforcing sheet is a portion on the other side of the reinforcing sheet in the first direction, the third connection portion of the third side portion and the third connection portion of the fourth side portion of the reinforcing sheet are located on one side in the first direction and / or the other side in the first direction with respect to the reinforcing portion of the third side portion and the reinforcing portion of the fourth side portion of the reinforcing sheet and are connected to the at least one sheet portion, A chair in which, when the first connection portion of the reinforcing sheet is a portion on one side of the reinforcing sheet in the second direction and the second connection portion of the reinforcing sheet is a portion on the other side of the reinforcing sheet in the second direction, the third connection portion of the third side portion and the third connection portion of the fourth side portion of the reinforcing sheet are located on one side in the second direction and / or the other side in the second direction with respect to the reinforcing portions of the third side portion and the fourth side portion of the reinforcing sheet and are connected to the at least one seat portion.

4. The chair according to claim 2 or 3, the third side and the fourth side of the at least one sheet portion have a reinforcing portion, A chair, wherein the reinforcing portion of the third side and the reinforcing portion of the fourth side of the reinforcing sheet extend along the reinforcing portion of the third side and the reinforcing portion of the fourth side of the at least one seat portion.

5. 2. The chair of claim 1, the at least one sheet portion further includes a third side portion on one side in the third direction and a fourth side portion on the other side in the third direction, the reinforcing sheet further has a third side portion on one side in the third direction and a fourth side portion on the other side in the third direction, A chair in which at least a portion of the third side of the reinforcing sheet extends along the third side of the at least one seat portion and is positioned on one side or the other side of the third direction relative to the third side of the at least one seat portion, and at least a portion of the fourth side of the reinforcing sheet extends along the fourth side of the at least one seat portion and is positioned on one side or the other side of the third direction relative to the fourth side of the at least one seat portion.

6. 2. The chair of claim 1, The at least one seat portion includes the backrest seat portion, the backrest sheet portion has a first portion on one side in the first direction and a second portion located on the other side in the first direction with respect to the first portion, The first connection portion of the reinforcing sheet is a portion on one side of the reinforcing sheet in the first direction and is connected to the first portion of the backrest sheet portion, The second connection portion of the reinforcing sheet is a portion on the other side of the reinforcing sheet in the first direction and is connected to the second portion of the backrest sheet portion, A chair, wherein the reinforcing sheet is arranged along the first portion to the second portion of the backrest sheet portion.

7. 7. The chair according to claim 6, The backrest sheet portion has an upper portion supported by the legs and a lower portion not supported by the legs, The lower portion has the first portion and the second portion, or the upper portion has the first portion and the lower portion has the second portion.

8. 2. The chair of claim 1, The at least one seat portion has the seating surface portion, The seating surface portion has a first portion on one side in the second direction and a second portion located on the other side in the second direction with respect to the first portion, The first connection portion of the reinforcing sheet is a portion on one side of the reinforcing sheet in the second direction and is connected to the first portion of the seating surface portion, The second connection portion of the reinforcing sheet is a portion on the other side of the reinforcing sheet in the first direction and is connected to the second portion of the seating surface portion, A chair in which the reinforcing sheet is arranged along the first portion to the second portion of the seat surface portion.

9. 2. The chair of claim 1, The at least one seat portion includes the backrest seat portion and the seat cushion seat portion, The backrest seat portion has a first portion, The seating surface portion has a second portion located on the other side in the first direction with respect to the first portion, The first connection portion of the reinforcing sheet is a portion on one side of the reinforcing sheet in the first direction and is connected to the first portion of the backrest sheet portion, The second connection portion of the reinforcing sheet is a portion on the other side of the reinforcing sheet in the first direction and is connected to the second portion of the backrest sheet portion, A chair, wherein the reinforcing sheet is disposed along the first portion to the second portion of the at least one seat portion.

10. 10. The chair of claim 9, The backrest sheet portion has an upper portion supported by the legs and a lower portion not supported by the legs, A chair, the lower portion of which has the first portion or the upper portion of which has the first portion.

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